CN202326527U - Closed hydraulic circuit and concrete pumping equipment - Google Patents
Closed hydraulic circuit and concrete pumping equipment Download PDFInfo
- Publication number
- CN202326527U CN202326527U CN2011204491875U CN201120449187U CN202326527U CN 202326527 U CN202326527 U CN 202326527U CN 2011204491875 U CN2011204491875 U CN 2011204491875U CN 201120449187 U CN201120449187 U CN 201120449187U CN 202326527 U CN202326527 U CN 202326527U
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- Prior art keywords
- oil
- hydraulic
- oil circuit
- way valve
- closed hydraulic
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- 238000005086 pumping Methods 0.000 title claims abstract description 22
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 33
- 230000002441 reversible effect Effects 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims description 30
- 238000011010 flushing procedure Methods 0.000 claims description 15
- 239000002828 fuel tank Substances 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 5
- 239000003921 oil Substances 0.000 abstract description 106
- 239000010720 hydraulic oil Substances 0.000 abstract description 33
- 238000004140 cleaning Methods 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 5
- 239000004568 cement Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a closed hydraulic circuit, this closed hydraulic circuit includes: a main oil pump (1), the main oil pump (1) having a first oil port (A) and a second oil port (B); the hydraulic control system comprises an actuating mechanism (10), wherein a first oil port (A) of a main oil pump (1) is connected to the actuating mechanism (10) through a first oil path (11), and a second oil port (B) of the main oil pump (1) is connected to the actuating mechanism (10) through a second oil path (12); wherein the closed hydraulic circuit further comprises a reversible bidirectional filtering device (9), the reversible bidirectional filtering device (9) being connected in series in the first oil path (11) and/or the second oil path (12). Through the technical scheme, all hydraulic oil in the closed hydraulic system can be filtered and cleaned through the bidirectional reversible filtering device, so that a good filtering and cleaning effect is obtained. The utility model also provides concrete pumping equipment.
Description
Technical field
The utility model relates to Hydraulic Field, particularly, relates to a kind of closed hydraulic loop and the concrete pumping equipment that comprises this closed hydraulic loop.
Background technique
Oil hydraulic circuit is divided into open circuit and closed circuit usually.In closed circuit, the oil inlet pipe of oil hydraulic pump directly links to each other with the return tube of executive component, and working liquid body carries out closed circulation in the pipeline of system.
Shown in Figure 1 is a kind of closed hydraulic loop, and this closed hydraulic loop comprises: main oil pump 1, this main oil pump 1 have the first hydraulic fluid port A and the second hydraulic fluid port B; Actuator 10, the first hydraulic fluid port A of said main oil pump 1 is connected in said actuator 10 through first oil circuit 11, and the second hydraulic fluid port B of said main oil pump 1 is connected in said actuator 10 through second oil circuit 12.
When this closed hydraulic loop operation; If the first hydraulic fluid port A of main oil pump 1 is as oil outlet, and the second hydraulic fluid port B is used as inlet port, then hydraulic oil goes out from the first hydraulic fluid port A pump pressure; Flow into actuator 10 through first oil circuit 11; After 10 actings of driving execution mechanism, flow back to main oil pump 1 through second oil circuit 12 again via the second hydraulic fluid port B, thereby circulate as inlet port; If the first hydraulic fluid port A of main oil pump 1 is as inlet port, and the second hydraulic fluid port B is used as oil outlet, then the hydraulic oil recycled back flows.
Said closed hydraulic loop also comprises flushing valve 3, and this flushing valve 3 has 31 and outlets 32 of two inlets, and said two inlets 31 are connected to said first oil circuit 11 and second oil circuit 12, and said outlet 32 is connected in fuel tank 8 through return filter 5.As shown in Figure 1, when the first hydraulic fluid port A was oil outlet, flushing valve 3 allowed the part hydraulic oil in second oil circuit 12 to flow back to fuel tank 8 through flushing valve 3 through return filter 5; When the second hydraulic fluid port B was oil outlet, flushing valve 3 allowed the part hydraulic oil in first oil circuit 11 to flow back to fuel tank through flushing valve 3 through return filter 5, to realize the filter cleaning effect to the hydraulic oil in the closed hydraulic loop.
Can know that through above description the most of hydraulic oil in the closed hydraulic loop can not get the filter cleaning effect.Because the hydraulic oil in the closed hydraulic loop is recycling always; Thereby cause the impurities accumulation in the hydraulic oil in this closed hydraulic loop to get more and more; Thereby; Use through after a while just need all be replaced the hydraulic oil in the closed hydraulic loop again, otherwise will influence the proper functioning of system.
Yet the hydraulic oil of all replacing again in the closed hydraulic loop must carry out under system's state out of service, and this causes the system maintenance cost higher and maintenance efficiency is lower.Therefore, for closed hydraulic loop, how can the hydraulic oil in the closed hydraulic loop be carried out the effective cleaning filtration and to become related domain technical issues that need to address.
The model utility content
The purpose of the utility model provides a kind of closed hydraulic loop, and this closed hydraulic loop can be carried out clean filtering effectively to its hydraulic oil.
To achieve these goals, the utility model provides a kind of closed hydraulic loop, and this closed hydraulic loop comprises: main oil pump, this main oil pump have the first hydraulic fluid port A and the second hydraulic fluid port B; Actuator, the first hydraulic fluid port A of said main oil pump is connected in said actuator through first oil circuit, and the second hydraulic fluid port B of said main oil pump is connected in said actuator through second oil circuit; Said closed hydraulic loop also comprises the bidirectional reversible filtrating equipment, and this bidirectional reversible filtrating equipment is connected in said first oil circuit and/or second oil circuit.
Preferably, said bidirectional reversible filtrating equipment comprises four one-way valves that connect into bridge type return and is connected the dual flow filter between the said one-way valve.
Preferably; Said bidirectional reversible filtrating equipment comprises first filtering module and second filtering module that is one another in series; Wherein, First filtering module comprises first one-way valve and first filter and second one-way valve that are connected in parallel with this first one-way valve, and the connection of wherein said first one-way valve and second one-way valve is in the opposite direction; Said second filtering module comprises the 3rd one-way valve and second filter and the 4th one-way valve that are connected in parallel with the 3rd one-way valve, and wherein, the connection of said the 3rd one-way valve and first one-way valve is in the opposite direction.
Preferably, this closed hydraulic loop comprises flushing valve, and this flushing valve has two inlets and an outlet, and said two inlets are connected to said first oil circuit and second oil circuit, and said outlet is connected in fuel tank through return filter.
Preferably, said closed hydraulic loop comprises slippage pump, and said fuel tank is connected in said first oil circuit or second oil circuit through this slippage pump.
Preferably, said closed hydraulic loop comprises the Pressure testing joint, and this Pressure testing joint is arranged on said first oil circuit and/or second oil circuit.
Preferably, said Pressure testing joint be arranged on said bidirectional reversible filtrating equipment position adjacent on.
The utility model also provides concrete pumping equipment, and this concrete pumping equipment comprises the above-mentioned closed hydraulic loop that the utility model provides.
Preferably, said actuator is the oil hydraulic motor of said concrete pumping equipment.
Preferably; This concrete pumping equipment comprises the two-cylinder type hydraulic piston concrete pump with pair of hydraulic cylinders; Said actuator is the said pair of hydraulic cylinders of this two-cylinder type hydraulic piston concrete pump; Said first oil circuit is connected in the rod chamber of an oil hydraulic cylinder, and the rodless cavity of this oil hydraulic cylinder is connected with the rodless cavity of another oil hydraulic cylinder, and the rod chamber of this another oil hydraulic cylinder is connected with said second oil circuit; Or said first oil circuit is connected in the rodless cavity of an oil hydraulic cylinder, and the rod chamber of this oil hydraulic cylinder is connected with the rod chamber of another oil hydraulic cylinder, and the rodless cavity of this another oil hydraulic cylinder is connected with said second oil circuit.
Through technique scheme, can carry out filter cleaning to the whole hydraulic oil in this closed type hydraulic system through the bidirectional reversible filtrating equipment and handle, thereby obtain filter cleaning effect preferably.
Other feature and advantage of the utility model will partly specify in embodiment subsequently.
Description of drawings
Accompanying drawing is the further understanding that is used to provide the utility model, and constitutes the part of specification, is used to explain the utility model with following embodiment, but does not constitute the restriction to the utility model.In the accompanying drawings:
Fig. 1 is a kind of structural representation of traditional closed hydraulic loop;
Fig. 2 is the structural representation according to a kind of preferred closed hydraulic loop of the utility model;
Fig. 3 is the schematic representation of a kind of specific constructive form of bidirectional reversible filtrating equipment in the presentation graphs 2; With
Fig. 4 is the schematic representation of the structural type of another kind of bidirectional reversible filter for installation.
Embodiment
Be elaborated below in conjunction with the embodiment of accompanying drawing to the utility model.Should be understood that embodiment described herein only is used for explanation and explains the utility model, is not limited to the utility model.
As shown in Figure 2, comprise according to the closed hydraulic loop of the utility model: main oil pump 1, this main oil pump 1 have the first hydraulic fluid port A and the second hydraulic fluid port B; Actuator 10, the first hydraulic fluid port A of said main oil pump 1 is connected in said actuator 10 through first oil circuit 11, and the second hydraulic fluid port B of said main oil pump 1 is connected in said actuator 10 through second oil circuit 12; Wherein, said closed hydraulic loop also comprises bidirectional reversible filtrating equipment 9, and this bidirectional reversible filtrating equipment 9 is connected in said first oil circuit 11 and/or second oil circuit 12.
Main oil pump 1 can be preferably axial variable plunger pump for gear pump, vane pump or plunger pump.The first hydraulic fluid port A of this main oil pump 1 and the second hydraulic fluid port B be oil outlet and inlet port each other.Actuator 10 can be actuator or an executive component common in the Hydraulic Field, like oil hydraulic motor or oil hydraulic cylinder or its combination.
Compare with traditional closed hydraulic loop shown in Figure 1, be provided with bidirectional reversible filtrating equipment 9 in the closed hydraulic loop according to the utility model preferred implementation shown in Figure 2.So-called bidirectional reversible filtrating equipment 9 is meant that the hydraulic oil to this bidirectional reversible filtrating equipment 9 of flowing through along two opposite directions can both carry out the filtrating equipment of filtration treatment effectively.Owing in first oil circuit 11 and/or second oil circuit 12, be in series with this bidirectional reversible filtrating equipment 9; Therefore; No matter be that the first hydraulic fluid port A of main oil pump 1 is during as oil outlet (the second hydraulic fluid port B is as inlet port); When still the first hydraulic fluid port A of main oil pump 1 is as inlet port (the second hydraulic fluid port B is as oil outlet), can both carries out filter cleaning through the whole hydraulic oil in 9 pairs of these closed type hydraulic systems of this bidirectional reversible filtrating equipment and handle.Only a part of hydraulic oil can access the contrast that filter cleaning is handled in traditional closed hydraulic loop shown in Figure 1, obviously has bigger technological progress.
Therefore, utilize the technological scheme of the utility model to carry out the effective cleaning filtration, thereby can solve the technical problem of the utility model, realize above-mentioned purpose the hydraulic oil in the closed hydraulic loop.
Bidirectional reversible filtrating equipment 9 can have various ways.
For example, shown in Figure 3 is a kind of preferred bidirectional reversible filtrating equipment 9.This bidirectional reversible filtrating equipment 9 comprises four one-way valves 13 that connect into bridge type return and is connected the dual flow filter 14 between the said one-way valve 13.
When hydraulic oil from C when D flows, hydraulic oil arrives E place from C through an one-way valve, from E through dual flow filter 14 arrival F, again via another one-way valve arrival D place.When hydraulic oil when D flows to C, hydraulic oil arrives E from D through an one-way valve, arrives F from E through dual flow filter 14, through another one-way valve arrival C place.Obviously, no matter how this closed hydraulic loop is moved, the hydraulic oil in the system all can be all through the filtration treatment of this bidirectional reversible filtrating equipment 9.
For another example, bidirectional reversible filtrating equipment 9 can comprise a pair of connection one-way valve in the opposite direction that is connected in parallel with each other, and each one-way valve all is in series with corresponding filter.
Also as; As shown in Figure 4; Bidirectional reversible filtrating equipment 9 can comprise first filtering module and second filtering module that is one another in series; Wherein, first filtering module comprises first one-way valve 163 and first filter 161 and second one-way valve 165 that are connected in parallel with this first one-way valve 163, and wherein the connection of first one-way valve 163 and second one-way valve 165 is in the opposite direction; Second filtering module comprises the 3rd one-way valve 166 and second filter 162 and the 4th one-way valve 164 that are connected in parallel with the 3rd one-way valve 166, and wherein, the connection of the 3rd one-way valve 166 and first one-way valve 163 is in the opposite direction.
Therefore, as shown in Figure 4, when hydraulic oil when the left side flows to the right side, hydraulic oil flows through first one-way valve 163, second filter 162 and the 4th one-way valve 164 successively, thereby is carried out filtration treatment by second filter 162; And when hydraulic oil flowed to the left side from the right side, hydraulic oil flow through the 3rd one-way valve 166, second one-way valve 165 and first filter 161 successively, thereby was carried out filtration treatment by first filter 161.Even if the connection direction of each one-way valve shown in Fig. 4 all is set to opposite direction, also can realize the function of bidirectional reversible filtrating equipment.
Under the situation that is provided with bidirectional reversible filtrating equipment 9, can in closed hydraulic loop, be provided with flushing valve 3, also flushing valve 3 can be set.But preferably; In order to obtain better filter cleaning effect; As shown in Figure 2, this closed hydraulic loop comprises flushing valve 3, and this flushing valve 3 has 31 and outlets 32 of two inlets; Said two inlets 31 are connected to said first oil circuit 11 and second oil circuit 12, and said outlet 32 is connected in fuel tank 8 through return filter 5.Running about this flushing valve 3 is described above, and repeats no more here.
As shown in Figure 2; Preferably; In order to remedy the loss of closed hydraulic loop hydraulic oil in running, said closed hydraulic loop comprises slippage pump 2, and said fuel tank 8 is connected in said first oil circuit 11 or second oil circuit 12 through this slippage pump 2; Thereby utilize this slippage pump 2, can always guarantee to have sufficient hydraulic oil in the closed hydraulic loop.Preferably, slippage pump 2 is integrated with main oil pump 1.As shown in Figure 2, be in series with repairing filter 4 between fuel tank 8 and the slippage pump 2.
In addition, as shown in Figure 2 under the preferable case, said closed hydraulic loop comprises Pressure testing joint 15, and this Pressure testing joint 15 is arranged on said first oil circuit 11 and/or second oil circuit 12.Pressure testing joint 15 can be communicated with first oil circuit 11 and/or second oil circuit 12, thereby detects the pressure of the hydraulic oil that flows in the oil circuit.Pressure testing joint 15 can be connected with various suitable pressure-detecting devices (not shown), to carry out Pressure testing.
Pressure testing joint 15 can be arranged on any suitable position on first oil circuit 11 and/or second oil circuit 12.But preferably; Said Pressure testing joint 15 is arranged on (upper reaches and/or downstream) position adjacent with said bidirectional reversible filtrating equipment 9; Thereby influence that can 9 pairs of system's hydraulic oil of this bidirectional reversible filtrating equipment of detection at any time is with the running state of adjustment closed hydraulic loop.
More than the closed hydraulic loop that the utility model provided is described in detail.Closed hydraulic loop according to the utility model can be applied to various hydraulic systems.
The utility model also provides a kind of concrete pumping equipment, and wherein, this concrete pumping equipment comprises the above-mentioned closed hydraulic loop that the utility model provides.The working environment of concrete pumping equipment is relatively poor usually, and various impurity or dust are more, and therefore the filter cleaning to hydraulic oil in the hydraulic system of concrete pumping equipment proposes higher requirement.And the closed hydraulic loop of utilizing the utility model can guarantee that hydraulic oil in the closed hydraulic loop obtains fully and filter cleaning efficiently, thereby be highly suitable for concrete pumping equipment.
Has multiple actuator in the concrete pumping equipment.For example, actuator can be the oil hydraulic motor of said concrete pumping equipment, and then above-mentioned closed hydraulic loop can be used to drive this oil hydraulic motor.
Perhaps; This concrete pumping equipment comprises the two-cylinder type hydraulic piston concrete pump with pair of hydraulic cylinders; The said pair of hydraulic cylinders 6,7 (as shown in Figure 2) that said actuator 10 is this two-cylinder type hydraulic piston concrete pump; Said first oil circuit 11 is connected in the rod chamber of an oil hydraulic cylinder 6, and the rodless cavity of this oil hydraulic cylinder 6 is connected with the rodless cavity of another oil hydraulic cylinder 7, and the rod chamber of this another oil hydraulic cylinder 7 is connected with said second oil circuit 12; Or said first oil circuit 11 is connected in the rodless cavity of an oil hydraulic cylinder 6, and the rod chamber of this oil hydraulic cylinder 6 is connected with the rod chamber of another oil hydraulic cylinder 7, and the rodless cavity of this another oil hydraulic cylinder 7 is connected with said second oil circuit 12.Can be about the concrete structure of two-cylinder type hydraulic piston concrete pump with reference to the description in " engineering machinery outline " (metallurgical industry publishing house, 2006 September the 1st edition) chapter 14 cement concrete conveying equipment second water saving cement concrete transfer pump.Here no longer other structures of concrete pump are described in detail.
More than combine accompanying drawing to describe the preferred implementation of the utility model in detail; But; The utility model is not limited to the detail in the above-mentioned mode of execution; In the technical conceive scope of the utility model, can carry out multiple simple variant to the technological scheme of the utility model, these simple variant all belong to the protection domain of the utility model.
Need to prove that in addition each the concrete technical characteristics described in above-mentioned embodiment under reconcilable situation, can make up through any suitable manner, and be not limited to the adduction relationship of each item claim in claims.For fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible compound modes.
In addition, also can carry out combination in any between the various mode of execution of the utility model, as long as its thought without prejudice to the utility model, it should be regarded as content disclosed in the utility model equally.
Claims (10)
1. closed hydraulic loop, this closed hydraulic loop comprises:
Main oil pump (1), this main oil pump (1) have first hydraulic fluid port (A) and second hydraulic fluid port (B);
Actuator (10), first hydraulic fluid port (A) of said main oil pump (1) is connected in said actuator (10) through first oil circuit (11), and second hydraulic fluid port (B) of said main oil pump (1) is connected in said actuator (10) through second oil circuit (12);
It is characterized in that said closed hydraulic loop also comprises bidirectional reversible filtrating equipment (9), this bidirectional reversible filtrating equipment (9) is connected in said first oil circuit (11) and/or second oil circuit (12).
2. closed hydraulic loop according to claim 1 is characterized in that, said bidirectional reversible filtrating equipment (9) comprises four one-way valves (13) that connect into bridge type return and is connected the dual flow filter (14) between the said one-way valve (13).
3. closed hydraulic loop according to claim 1; It is characterized in that; Said bidirectional reversible filtrating equipment (9) comprises first filtering module and second filtering module that is one another in series; Wherein, first filtering module comprises first one-way valve (163) and first filter (161) and second one-way valve (165) that are connected in parallel with this first one-way valve (163), and the connection of wherein said first one-way valve (163) and second one-way valve (165) is in the opposite direction; Said second filtering module comprises the 3rd one-way valve (166) and second filter (162) and the 4th one-way valve (164) that are connected in parallel with the 3rd one-way valve (166), and wherein, the connection of said the 3rd one-way valve (166) and first one-way valve (163) is in the opposite direction.
4. according to any described closed hydraulic loop among the claim 1-3; It is characterized in that; This closed hydraulic loop comprises flushing valve (3); This flushing valve (3) has two inlets (31) and an outlet (32), and said two inlets (31) are connected to said first oil circuit (11) and second oil circuit (12), and said outlet (32) is connected in fuel tank (8) through return filter (5).
5. closed hydraulic loop according to claim 4 is characterized in that, said closed hydraulic loop comprises slippage pump (2), and said fuel tank (8) is connected in said first oil circuit (11) or second oil circuit (12) through this slippage pump (2).
6. closed hydraulic loop according to claim 1 is characterized in that, said closed hydraulic loop comprises Pressure testing joint (15), and this Pressure testing joint (15) is arranged on said first oil circuit (11) and/or second oil circuit (12).
7. closed hydraulic loop according to claim 6 is characterized in that, said Pressure testing joint (15) be arranged on said bidirectional reversible filtrating equipment (9) position adjacent on.
8. concrete pumping equipment is characterized in that, this concrete pumping equipment comprises according to any described closed hydraulic loop among the claim 1-7.
9. concrete pumping equipment according to claim 8 is characterized in that, said actuator is the oil hydraulic motor of said concrete pumping equipment.
10. concrete pumping equipment according to claim 8; It is characterized in that; This concrete pumping equipment comprises the have pair of hydraulic cylinders two-cylinder type hydraulic piston concrete pump of (6,7), and said actuator (10) is the said pair of hydraulic cylinders (6 of this two-cylinder type hydraulic piston concrete pump; 7); Said first oil circuit (11) is connected in the rod chamber of an oil hydraulic cylinder (6), and the rodless cavity of this oil hydraulic cylinder (6) is connected with the rodless cavity of another oil hydraulic cylinder (7), and the rod chamber of this another oil hydraulic cylinder (7) is connected with said second oil circuit (12); Or said first oil circuit (11) is connected in the rodless cavity of an oil hydraulic cylinder (6), and the rod chamber of this oil hydraulic cylinder (6) is connected with the rod chamber of another oil hydraulic cylinder (7), and the rodless cavity of this another oil hydraulic cylinder (7) is connected with said second oil circuit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204491875U CN202326527U (en) | 2011-11-14 | 2011-11-14 | Closed hydraulic circuit and concrete pumping equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204491875U CN202326527U (en) | 2011-11-14 | 2011-11-14 | Closed hydraulic circuit and concrete pumping equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202326527U true CN202326527U (en) | 2012-07-11 |
Family
ID=46438508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204491875U Expired - Lifetime CN202326527U (en) | 2011-11-14 | 2011-11-14 | Closed hydraulic circuit and concrete pumping equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202326527U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103089757A (en) * | 2013-01-29 | 2013-05-08 | 三一重工股份有限公司 | Closed hydraulic loop hot oil displacement system and concrete pumping device |
| CN110630593A (en) * | 2019-10-11 | 2019-12-31 | 湖南响箭重工科技有限公司 | Hydraulic station for efficiently cleaning oil cylinder and method for cleaning oil cylinder |
-
2011
- 2011-11-14 CN CN2011204491875U patent/CN202326527U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103089757A (en) * | 2013-01-29 | 2013-05-08 | 三一重工股份有限公司 | Closed hydraulic loop hot oil displacement system and concrete pumping device |
| CN103089757B (en) * | 2013-01-29 | 2015-03-18 | 三一汽车制造有限公司 | Closed hydraulic loop hot oil displacement system and concrete pumping device |
| CN110630593A (en) * | 2019-10-11 | 2019-12-31 | 湖南响箭重工科技有限公司 | Hydraulic station for efficiently cleaning oil cylinder and method for cleaning oil cylinder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |