CN202326480U - Pumping equipment as well as high/low-pressure switching system and pumping system thereof - Google Patents
Pumping equipment as well as high/low-pressure switching system and pumping system thereof Download PDFInfo
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- CN202326480U CN202326480U CN2011204725736U CN201120472573U CN202326480U CN 202326480 U CN202326480 U CN 202326480U CN 2011204725736 U CN2011204725736 U CN 2011204725736U CN 201120472573 U CN201120472573 U CN 201120472573U CN 202326480 U CN202326480 U CN 202326480U
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Abstract
The utility model provides pumping equipment as well as a high/low-pressure switching system and a pumping system thereof so as to solve the problems of high cost, high failure rate and poor performance of the pumping system in the prior art. The high/low-pressure switching system provided by the utility model comprises a first pumping oil cylinder, a second pumping oil cylinder, a first three-position four-way hydraulic reversing valve, a second three-position four-way hydraulic reversing valve, a first auxiliary reversing valve and a second auxiliary reversing valve, wherein two working oil ports of the first hydraulic reversing valve are respectively connected with a rod-available cavity and a rodless cavity of the first pumping oil cylinder, and two control oil ports of the first hydraulic reversing valve are respectively connected with two working oil ports of the first auxiliary reversing valve; two working oil ports of the second hydraulic reversing valve are respectively connected with a rod-available cavity and a rodless cavity of the second pumping oil cylinder, and two control oil ports of the second hydraulic reversing valve are respectively connected with two working oil ports of the second auxiliary reversing valve; and one of an oil outlet and an oil inlet of the first hydraulic reversing valve is connected with one of an oil outlet and an oil inlet of the second hydraulic reversing valve. By adoption of the technical scheme disclosed by the utility model, high/low-pressure pumping switching, automatic cylinder locking during standy and simultaneous stretching or retracting of the oil cylinders can be realized.
Description
Technical field
The utility model relates to the hydraulics field, particularly a kind of pumping equipment and high low pressure switched system and pumping system.
Background technique
Pumping equipment for example concrete pumping equipment need carry out big discharge capacity work of low pressure or the work of high pressure float amount according to different working conditions in the course of the work.When the big discharge capacity of low pressure is worked, the oil-feed of two pumping cylinder rod chambers, rodless cavity is communicated with; When high pressure float amount is worked, the oil-feed of two pumping oil cylinder rodless cavities, rod chamber is communicated with.
CN200910116607.5 discloses the automatic high low pressure of the two master cylinders of a kind of concrete pump truck pumping and has switched and telescoping hydraulic device in the same way, and this device hydraulic element are many, complex structure, and manufacture cost is high; High, the difficulty of fixing a breakdown of rate of fault in use, and the pressure loss of system is very big, when standby, the pumping oil cylinder returns slide, can't auto lock, performance is not good.
CN200920079047.6 discloses a kind of oil cylinder high low pressure switching valve, and this device can't be realized the auto lock of oil cylinder, and is flexible when also can't realize oil cylinder, so performance is not good.
In general, in the prior art, the cost of pumping system and rate of fault are high, and performance is not good, for this problem, does not propose effective solution at present as yet.
The model utility content
The main purpose of the utility model provides a kind of pumping equipment and high low pressure switched system and pumping system, and is high with cost and the rate of fault that solves pumping system in the existing technology, and the not good problem of performance.
To achieve these goals, according to an aspect of the utility model, a kind of high low pressure switched system that is used for pumping equipment is provided.
The high low pressure switched system that is used for pumping equipment of the utility model; Comprise two pumping oil cylinders, also comprise first and second hydraulicchange-over valves, and the first and second auxiliary selector valves; Said hydraulicchange-over valve and said auxiliary selector valve are 3-position 4-way; Wherein: for first hydraulicchange-over valve, its two actuator ports connect first pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the first auxiliary selector valve respectively; For second hydraulicchange-over valve, its two actuator ports connect second pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the second auxiliary selector valve respectively; The oil outlet of first hydraulicchange-over valve is connected with the oiler of second hydraulicchange-over valve.
Another aspect according to the utility model provides a kind of pumping system.
The pumping system of the utility model comprises the main oil pump and second oil pump; The pumping system that also comprises the utility model; And: first end of said main oil pump connects the oiler of said first hydraulicchange-over valve, and second end connects the oil outlet of said second hydraulicchange-over valve; First end of said second oil pump connects the oil outlet of the said first auxiliary selector valve and the said second auxiliary selector valve.
Another aspect according to the utility model provides a kind of pumping equipment.
The pumping equipment of the utility model has concrete pumping system, comprises the high low pressure switched system that is used for pumping equipment of the utility model in this concrete pumping system.
According to the technological scheme of the utility model, two 3-position 4-way hydraulicchange-over valves are set, the control oil channel control that the working position of this hydraulicchange-over valve is made up of the auxiliary selector valve of two other 3-position 4-way on the pumping system working connection; The pumping system of forming like this can realize easily that high low pressure switches, and good performance is arranged, and flexible when having realized oil cylinder; Can self-locking when standby, and no matter be working connection or control oil channel, element is all seldom; Simple in structure, the fault point is few, and rate of fault is low; And the system pressure loss is little, reliable and stable, thereby manufacture cost and user cost are all low.
Description of drawings
Figure of description is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the schematic representation according to a kind of optional structure of the utility model embodiment's pumping system;
Fig. 2 is the schematic representation according to the chief component of the utility model embodiment's concrete mixer.
Embodiment
Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.Below with reference to accompanying drawing and combine embodiment to specify the utility model.
The high low pressure switched system that is used for pumping equipment in the present embodiment also comprises first and second hydraulicchange-over valves except two pumping oil cylinders, and the first and second auxiliary selector valves, and above-mentioned hydraulicchange-over valve and above-mentioned auxiliary selector valve are 3-position 4-way.And for first hydraulicchange-over valve, its two actuator ports connect first pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the first auxiliary selector valve respectively; For second hydraulicchange-over valve, its two actuator ports connect second pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the second auxiliary selector valve respectively; The oil outlet of first hydraulicchange-over valve and oiler the two one of with the oil outlet and oiler of second hydraulicchange-over valve the two one of be connected.In pumping system, not interconnected two hydraulic fluid ports in addition of first hydraulicchange-over valve and second hydraulicchange-over valve are connected the oil pump two ends respectively.
For the high low pressure switched system of present embodiment, through controlling auxiliary selector valve, can make first and second hydraulicchange-over valves work in position, a left side, right position or meta, thereby form different oil circuits, realize the various methods of operation of pumping oil cylinder then.Below explain for example.
Fig. 1 is the schematic representation according to a kind of optional structure of the utility model embodiment's pumping system.The graphic symbol of the hydraulic element among Fig. 1 and word indicating are according to NBS JB/T 10373-2002 and JB/T 10365-2002.And in Fig. 1,, behind the letter of the valve port of representing each selector valve or electromagnet, added numeral or alphabetical in order to distinguish.
As shown in Figure 1; Pumping system in the present embodiment has comprised high low pressure switched system above-mentioned in the present embodiment; Mainly contain main oil pump 1, second oil pump 10 in this pumping system; Comprise the capital equipment in the high low pressure switched system in addition, i.e. two pumping oil cylinders 9,11, and first hydraulicchange-over valve 14, second hydraulicchange-over valve 6, first solenoid directional control valve 15 and second solenoid directional control valve 4.First hydraulicchange-over valve 14, second hydraulicchange-over valve 6, first solenoid directional control valve 15 and second solenoid directional control valve 4 are three-position four-way valve.First hydraulicchange-over valve 14 and second hydraulicchange-over valve 6 can be selected same size for use, and first solenoid directional control valve 15 and second solenoid directional control valve 4 also can be selected same size for use.Pumping system in the present embodiment can be a concrete pumping system.First hydraulicchange-over valve 14, second hydraulicchange-over valve 6 preferably can adopt the hydraulicchange-over valve of big latus rectum.
The effect of main oil pump 1 is to two pumping oil cylinders, 9,11 supply pressures oil.The effect of second oil pump 10 is to first solenoid directional control valve 15 and second solenoid directional control valve, 4 supply pressures oil, second oil pump 10 can with main oil pump 1 from same transfer case power taking, also can possess power source separately.The pumping oil cylinder 9,11 and first hydraulicchange-over valve 14, second hydraulicchange-over valve 6, first solenoid directional control valve 15 and second solenoid directional control valve 4 have constituted the high low pressure switched system that is used for pumping equipment.
Among Fig. 14 and 15 adopted solenoid directional control valve, as auxiliary selector valve to control first hydraulicchange-over valve 14 and second hydraulicchange-over valve 6; Also can adopt hydraulicchange-over valve as auxiliary selector valve in addition, and can have the control corresponding element separately according to common way of the prior art, the hydraulicchange-over valve that for example adopts Proportional valve to control as auxiliary selector valve works in position, a left side or right position.Below still adopting solenoid directional control valve with 4 and 15 is that example describes.
For first hydraulicchange-over valve 14; Its AI mouth connects the first pumping cylinder rod chamber; The BI mouth connects the first pumping oil cylinder, 11 rodless cavities; The PI mouth connects main oil pump 1 first end, and 1. the first control mouth connects the A1 mouth of first solenoid directional control valve 15, and 2. the second control mouth connects the B1 mouth of first solenoid directional control valve 15.
For second hydraulicchange-over valve 6; Its AII mouth connects the second pumping oil cylinder, 9 rod chambers; The BII mouth connects the second pumping oil cylinder, 9 rodless cavities; The PII mouth connects second end of main oil pump 1, and 3. the first control mouth connects the A2 mouth of second solenoid directional control valve 4, and 4. the second control mouth connects the B2 mouth of second solenoid directional control valve 4.
First hydraulicchange-over valve 14 is connected mutually with the TII mouth of second hydraulicchange-over valve 6.
The T mouth of the T mouth of first solenoid directional control valve 15 and second solenoid directional control valve 4 is used to connect fuel tank 17.Ball valve 18 is used for manual off-load second oil pump 10, and three position four-way electromagnetic valve 19 is used for the pressure of automatic deloading second oil pump 10 and in good time this system of demonstration.
Use the pumping system of present embodiment, can realize the switching of high low pressure pumping easily, and automatic locking cylinder can realize the flexible simultaneously and standby of pumping oil cylinder the time.Below the operation method of the utility model embodiment's pumping system is elaborated.
One, the high low pressure pumping is switched
When needs switch to the low pressure pumping, make solenoid directional control valve 15 a1 electromagnet and solenoid directional control valve 4 the a2 electromagnet simultaneously electric, can adopt equipment such as manually-operated button or controller to send control signal, solenoid directional control valve 15 left side position work in the control oil channel; P1 mouth and A1 oral groove are logical, and B1 mouth and T1 oral groove are logical, and this moment, pilot pressure acted on the 1. mouth of hydraulicchange-over valve 14, the position work of hydraulicchange-over valve 14 left side; PI leads to A1, and TI leads to B1, and solenoid directional control valve 4 is the work of position, a left side also; P2 mouth and A2 oral groove are logical, and B2 mouth and T2 oral groove are logical, and this moment, pilot pressure acted on the 3. mouth of hydraulicchange-over valve 6; The position work of hydraulicchange-over valve 6 left side, PII leads to AII, and TII leads to BII; This moment, working connection pressure oil arrived the rod chamber of master cylinder 11 through PI, A1, the hydraulic pipe line 12 of hydraulic pipe line 3, hydraulicchange-over valve 14 through the A of main oil pump 1 mouth; Promoting pumping oil cylinder 11 regains; This oil cylinder rodless cavity pressure oil promotes pumping oil cylinder 9 and stretch out, and its rod chamber hydraulic oil is got back to the B mouth of main oil pump through AII, PII, the hydraulic pipe line 2 of hydraulic pipe line 7, hydraulicchange-over valve 6 through the rodless cavity of the TII of the BI of hydraulic pipe line 13, hydraulicchange-over valve 14, T1, hydraulic pipe line 5, hydraulicchange-over valve 6, BII, hydraulic pipe line 8 to pumping oil cylinder 9; In like manner; When main oil pump 1 switching-over, when the B mouth was pressed oil, the oil return of A mouth, pumping oil cylinder 9 was regained, pumping oil cylinder 11 stretches out; So circulation realizes the low pressure pumping.
When needs switch to the high pressure pumping, make solenoid directional control valve 15 b1 electromagnet and solenoid directional control valve 4 the b2 electromagnet simultaneously electric, solenoid directional control valve 15 right position work in the control oil channel; P1 mouth and B1 oral groove are logical; A1 mouth and T1 oral groove are logical, and this moment, pilot pressure acted on the 2. mouth of hydraulicchange-over valve 14, hydraulicchange-over valve 14 right position work; PI leads to B1, and TI leads to A1; Solenoid directional control valve 4 also right position work, P2 leads to B2, and A2 leads to T2, and this moment, pilot pressure acted on the 4. mouth of hydraulicchange-over valve 6, hydraulicchange-over valve 6 right position work, PII leads to BII, and TII leads to AII; This moment, working connection pressure oil arrived the rodless cavity of pumping oil cylinder 11 through PI, B1,13 hydraulic pipe lines of hydraulic pipe line 3, hydraulicchange-over valve 14 through the A of main oil pump 1 mouth; Promoting pumping oil cylinder 11 stretches out; Pumping cylinder 11 rod chamber pressure oils promote 9 withdrawals of pumping oil cylinder, and its rodless cavity hydraulic oil are got back to main oil pump B mouth through BII, PII, the hydraulic pipe line 2 of hydraulic pipe line 8, hydraulicchange-over valve 6 through the rod chamber of the TII of the AI of hydraulic pipe line 12, hydraulicchange-over valve 14, T1, hydraulic pipe line 5, hydraulicchange-over valve 6, AII, hydraulic pipe line 7 to pumping oil cylinder 9; In like manner; When main oil pump 1 switching-over, when the B mouth was pressed oil, the oil return of A mouth, pumping oil cylinder 9 stretched out, 11 withdrawals of pumping oil cylinder; So circulation realizes the high pressure pumping.
Two, automatic locking cylinder during standby
The function of automatic locking cylinder when realizing standby, hydraulicchange-over valve 14 and hydraulicchange-over valve 6 working hole A, the locking of B mouth when meta, oiler P and oil outlet T mouth are communicated with; And solenoid directional control valve 15 is communicated with the pressurize of P mouth with solenoid directional control valve 4 working hole A, B mouth when meta with oil outlet T mouth.
When standby, the left and right sides electromagnet of solenoid directional control valve 15 and solenoid directional control valve 4 all must not be electric, and two solenoid directional control valves return meta; Make its A, B mouth all lead to the T mouth; Make each Self Control hydraulicchange-over valve 14,6 the control mouth 1., 2., 3., 4. off-load, hydraulicchange-over valve all returns meta, at this moment; Its A, the pressurize of B mouth, the off-load of P mouth.Be main oil pump 1 off-load, and pumping oil cylinder 9 and pumping oil cylinder 11 auto locks.
Three, the pumping oil cylinder is withdrawn simultaneously
Make solenoid directional control valve 15 a1 electromagnet and solenoid directional control valve 4 the b2 electromagnet simultaneously electric, solenoid directional control valve 15 left side position work in the control oil channel, P1 leads to A1; B1 leads to T1, and this moment, pilot pressure acted on the 1. mouth of hydraulicchange-over valve 14, the position work of hydraulicchange-over valve 14 left side; PI leads to A1, and TI leads to B1; Solenoid directional control valve 4 right position work, P2 leads to B2, and A2 leads to T2, and this moment, pilot pressure acted on the 4. mouth of hydraulicchange-over valve 6, hydraulicchange-over valve 6 right position work, PII leads to BII, and TII leads to AII; This moment, working connection pressure oil arrived the rod chamber of pumping oil cylinder 11 through PI, A1, the hydraulic pipe line 12 of hydraulic pipe line 3, hydraulicchange-over valve 14 through the A of main oil pump 1 mouth; Promote 11 withdrawals of pumping oil cylinder; Pumping oil cylinder 11 rodless cavity pressure oils are through the rod chamber of the TII of the BI of hydraulic pipe line 13, hydraulicchange-over valve 14, T1, hydraulic pipe line 5, hydraulicchange-over valve 6, AII, hydraulic pipe line 7 to pumping oil cylinder 9; Promote pumping oil cylinder 9 withdrawal simultaneously, pumping oil cylinder 9 rodless cavity hydraulic oil are got back to main oil pump B mouth through BII, PII, the hydraulic pipe line 2 of hydraulic pipe line 8, hydraulicchange-over valve 6, in like manner; When the B of main oil pump 1 mouth is pressed oil, the oil return of A mouth; Pumping oil cylinder 9,11 also can be withdrawn simultaneously, and can change concrete piston this moment, debugging oil cylinder, system.
Four, the pumping oil cylinder stretches out simultaneously
Make solenoid directional control valve 15 b1 electromagnet and solenoid directional control valve 4 the a2 electromagnet simultaneously electric, solenoid directional control valve 15 right position work in the control oil channel, P1 leads to B1; A1 leads to T1, and this moment, pilot pressure acted on the 2. mouth of hydraulicchange-over valve 14, hydraulicchange-over valve 14 right position work; PI leads to B1, and TI leads to A1; The position work of solenoid directional control valve 4 left side, P2 leads to A2, and B2 leads to T2, and this moment, pilot pressure acted on the 3. mouth of hydraulicchange-over valve 6, the position work of hydraulicchange-over valve 6 left side, PII leads to AII, and TII leads to BII; This moment, working connection pressure oil arrived the rodless cavity of pumping oil cylinder 11 through PI, B1, the hydraulic pipe line 13 of hydraulic pipe line 3, hydraulicchange-over valve 14 through the A of main oil pump 1 mouth; Promoting pumping oil cylinder 11 stretches out; This cylinder rod chamber pressure oil is through the rodless cavity of the TII of the AI of hydraulic pipe line 12, hydraulicchange-over valve 14, T1, hydraulic pipe line 5, hydraulicchange-over valve 6, BII, hydraulic pipe line 8 to pumping oil cylinder 9; Promoting pumping oil cylinder 9 stretches out simultaneously; And its rod chamber hydraulic oil is got back to main oil pump B mouth through AII, PII, the hydraulic pipe line 2 of hydraulic pipe line 7, hydraulicchange-over valve 6, in like manner, and when the B of main oil pump 1 mouth is pressed oil, the oil return of A mouth; Pumping oil cylinder 9,11 also can stretch out simultaneously, and can debug oil cylinder, system this moment.
The Placement of hydraulicchange-over valve 6,14 among Fig. 1 and solenoid directional control valve 4,15 and pumping oil cylinder 11, pumping oil cylinder 9 and main oil pump 1, second oil pump 10 is merely example; Because the mode of communicating of each selector valve is controlled; Therefore no matter connect in which way and (for example the AI mouth of hydraulicchange-over valve 14, the above-mentioned Placement of BI mouth are exchanged; And for example with solenoid directional control valve 4), as long as control solenoid directional control valve 4,15 makes oil circuit realize correct logic.
Particularly, realize the low pressure pumping, promptly control solenoid directional control valve 4,15, make main oil pump 1 that hydraulic oil is injected the rod chamber of pumping oil cylinder 11 or the rod chamber of pumping oil cylinder 9, the rodless cavity of the rodless cavity of simultaneous pumping oil cylinder 11 and pumping oil cylinder 9 is communicated with.
Realize the high pressure pumping, promptly control solenoid directional control valve 4,15, make main oil pump 1 that hydraulic oil is injected the rodless cavity of pumping oil cylinder 11 or the rodless cavity of pumping oil cylinder 9, the rod chamber of the rod chamber of simultaneous pumping oil cylinder 11 and pumping oil cylinder 9 is communicated with.
Realize that the pumping oil cylinder withdraws simultaneously, promptly control main oil pump 1 hydraulic oil is injected the rod chamber of pumping oil cylinder 11 that the hydraulic oil in the rodless cavity of pumping oil cylinder 11 injects the rod chamber of pumping oil cylinder 9.
Realize that the pumping oil cylinder withdraws simultaneously, promptly control selector valve 4,15, make main oil pump 1 that hydraulic oil is injected the rodless cavity of pumping oil cylinder 11, the hydraulic oil in the rod chamber of pumping oil cylinder 11 injects the rodless cavity of pumping oil cylinder 9.
Pumping equipment in the present embodiment has concrete pumping system, equipment such as concrete pump, concrete mixer for example, and pumping system wherein can adopt the pumping system in the present embodiment.With the concrete mixer is example, and its chief component is referring to Fig. 2.Fig. 2 is the schematic representation according to the chief component of the utility model embodiment's concrete mixer.
As shown in Figure 2, concrete mixer 20 has fuel tank 21 and concrete pumping system 22.Wherein comprise the high low pressure switched system that is used for pumping equipment in the present embodiment in the concrete pumping system 22.
According to the utility model embodiment's technological scheme, two 3-position 4-way hydraulicchange-over valves are set, the control oil channel control that the working position of this hydraulicchange-over valve is made up of the auxiliary selector valve of two other 3-position 4-way on the pumping system working connection; The pumping system of forming like this can realize easily that high low pressure switches, and good performance is arranged, and flexible when having realized oil cylinder; Can self-locking when standby, and no matter be working connection or control oil channel, element is all seldom; Simple in structure, the fault point is few, and rate of fault is low; And the system pressure loss is little, reliable and stable, thereby manufacture cost and user cost are all low.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection domain of the utility model.
Claims (8)
1. a high low pressure switched system that is used for pumping equipment comprises two pumping oil cylinders, it is characterized in that; Said pumping system also comprises first and second hydraulicchange-over valves; And the first and second auxiliary selector valves, said hydraulicchange-over valve and said auxiliary selector valve are 3-position 4-way, wherein:
For first hydraulicchange-over valve, its two actuator ports connect first pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the first auxiliary selector valve respectively;
For second hydraulicchange-over valve, its two actuator ports connect second pumping cylinder rod chamber and the rodless cavity respectively, and its two control ports connect two actuator ports of the second auxiliary selector valve respectively;
The oil outlet of first hydraulicchange-over valve and oiler the two one of with the oil outlet and oiler of second hydraulicchange-over valve the two one of be connected.
2. system according to claim 1 is characterized in that the specification of said first and second hydraulicchange-over valves is identical.
3. system according to claim 1 is characterized in that, the specification of the said first and second auxiliary selector valves is identical.
4. system according to claim 1 is characterized in that, said auxiliary selector valve is solenoid directional control valve or hydraulicchange-over valve.
5. system according to claim 1 is characterized in that,
When the said first and second auxiliary selector valves were in meta, its actuator port all was communicated with oil outlet;
When said first and second hydraulicchange-over valves are in meta, its actuator port locking, oiler is communicated with oil outlet.
6. a pumping system comprises the main oil pump and second oil pump, it is characterized in that, said pumping system also comprises each described pumping system in the claim 1 to 5, and:
First end of said main oil pump connects the oiler of said first hydraulicchange-over valve, and second end connects the oil outlet of said second hydraulicchange-over valve;
First end of said second oil pump connects the oiler of the said first auxiliary selector valve and the said second auxiliary selector valve.
7. pumping system according to claim 6 is characterized in that, said second oil pump is a constant pressure pump, and its first end is the pressure hydraulic fluid port.
8. a pumping equipment has concrete pumping system, it is characterized in that, comprises each described high low pressure switched system that is used for pumping equipment in the claim 1 to 5 in the said concrete pumping system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204725736U CN202326480U (en) | 2011-11-23 | 2011-11-23 | Pumping equipment as well as high/low-pressure switching system and pumping system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204725736U CN202326480U (en) | 2011-11-23 | 2011-11-23 | Pumping equipment as well as high/low-pressure switching system and pumping system thereof |
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| Publication Number | Publication Date |
|---|---|
| CN202326480U true CN202326480U (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204725736U Expired - Lifetime CN202326480U (en) | 2011-11-23 | 2011-11-23 | Pumping equipment as well as high/low-pressure switching system and pumping system thereof |
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| CN (1) | CN202326480U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434510A (en) * | 2011-11-23 | 2012-05-02 | 中联重科股份有限公司 | Pumping equipment and high-low pressure switching system of pumping equipment, pumping system and operation method of pumping system |
| CN103590996A (en) * | 2013-11-22 | 2014-02-19 | 中联重科股份有限公司 | Pumping equipment and pumping method |
-
2011
- 2011-11-23 CN CN2011204725736U patent/CN202326480U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102434510A (en) * | 2011-11-23 | 2012-05-02 | 中联重科股份有限公司 | Pumping equipment and high-low pressure switching system of pumping equipment, pumping system and operation method of pumping system |
| CN102434510B (en) * | 2011-11-23 | 2015-03-18 | 中联重科股份有限公司 | Pumping equipment and high-low pressure switching system of pumping equipment, pumping system and operation method of pumping system |
| CN103590996A (en) * | 2013-11-22 | 2014-02-19 | 中联重科股份有限公司 | Pumping equipment and pumping method |
| CN103590996B (en) * | 2013-11-22 | 2015-08-26 | 中联重科股份有限公司 | Pumping equipment and pumping method |
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| GR01 | Patent grant | ||
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Granted publication date: 20120711 |