CN112879262A - Mortar pumping device for in-situ spraying and building repair of comprehensive pipe gallery - Google Patents
Mortar pumping device for in-situ spraying and building repair of comprehensive pipe gallery Download PDFInfo
- Publication number
- CN112879262A CN112879262A CN202110265237.2A CN202110265237A CN112879262A CN 112879262 A CN112879262 A CN 112879262A CN 202110265237 A CN202110265237 A CN 202110265237A CN 112879262 A CN112879262 A CN 112879262A
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- China
- Prior art keywords
- material cylinder
- communicated
- valve
- cylinders
- way pneumatic
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 33
- 238000005086 pumping Methods 0.000 title claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 11
- 238000005507 spraying Methods 0.000 title description 7
- 239000000463 material Substances 0.000 claims abstract description 66
- 239000002002 slurry Substances 0.000 claims abstract description 9
- UGTJLJZQQFGTJD-UHFFFAOYSA-N Carbonylcyanide-3-chlorophenylhydrazone Chemical compound ClC1=CC=CC(NN=C(C#N)C#N)=C1 UGTJLJZQQFGTJD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000003921 oil Substances 0.000 description 36
- 238000007599 discharging Methods 0.000 description 10
- 238000010276 construction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000009750 centrifugal casting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011429 hydraulic mortar Substances 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
- F04B15/023—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous supply of fluid to the pump by gravity through a hopper, e.g. without intake valve
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/109—Valves; Arrangement of valves inlet and outlet valve forming one unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
- F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a mortar pumping device for in-situ spray-building repair of a comprehensive pipe gallery, wherein in a frame structure, a mixing hopper is arranged at the top of the frame structure, two groups of hydraulic cylinders and two groups of material cylinders are respectively arranged at the bottom of the frame structure in parallel, and the hydraulic cylinders and the material cylinders are connected in pairs; in the valve body, a feed inlet is communicated with a material cylinder interface, a first one-way pneumatic valve is arranged on a passage between the feed inlet and the material cylinder interface, the material cylinder interface is communicated with a discharge outlet, a second one-way pneumatic valve is arranged on a passage between the feed inlet and the material cylinder interface, and the first one-way pneumatic valve and the second one-way pneumatic valve are counter valves. The feed inlets of the two groups of valve bodies are communicated with the mixing hopper through a flow guide pipe, the discharge outlets of the two valve bodies are communicated with the slurry conveying pipe, and the material cylinder interfaces of the two valve bodies are respectively communicated with the output ends of the two material cylinders. The invention can better realize the high-efficiency and long-distance pumping of the CCCP repairing mortar, is simple and convenient in design and easy to operate, and can well meet the requirements of CCCP repairing on the pumping pressure and distance of the mortar.
Description
Technical Field
The invention relates to the technical field of trenchless underground engineering repair equipment, in particular to a mortar pumping device for in-situ spraying and repairing of a comprehensive pipe gallery.
Background
The centrifugal casting and spraying (CCCP) technology is one of the most widely used underground passage structural repair methods at the present stage, and the principle is to pump a paste lining slurry prepared in advance to a high-speed rotary sprayer which is positioned on the central axis of a comprehensive Pipe gallery and driven by compressed air, uniformly Cast the material on the inner wall of the Pipe gallery under the action of centrifugal force, and simultaneously, the rotary sprayer is slowly dragged along the central axis of the Pipe gallery under the drive of a traction winch, so that the lining slurry forms a continuous and compact lining layer on the Pipe wall.
For repairing a long-distance defective pipe gallery structure, how to pump mortar in a long distance and have a better pressure maintaining effect is one of the problems to be solved urgently. The existing mortar pumping system is classified from the aspect of power source and comprises the forms of electric, pneumatic, hydraulic and the like, wherein the hydraulic pumping system is stable in performance, sufficient in power, economical and environment-friendly and is widely applied. However, when the comprehensive pipe gallery is repaired by a centrifugal casting spraying method (CCCP), if a traditional single-cylinder hydraulic mortar pumping device is adopted, the pumping pressure and the pumping distance of the device cannot meet the requirement of repairing the long-distance pipe gallery.
Disclosure of Invention
The invention aims to provide a mortar pumping device for in-situ spraying and repairing of a comprehensive pipe gallery, which can better realize high-efficiency and long-distance pumping of CCCP repairing mortar, is simple and convenient in design and easy to operate, and can better meet the requirements of CCCP repairing on the mortar pumping pressure and distance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a mortar pumping device for in-situ spraying repair of a comprehensive pipe gallery comprises a frame structure, a mixing hopper, two sets of hydraulic cylinders, two sets of material cylinders, two sets of valve bodies, an oil tank structure and an oil way block structure, wherein the frame structure is of a cubic framework structure, the mixing hopper is arranged at the top of the frame structure, the two sets of hydraulic cylinders and the two sets of material cylinders are respectively arranged at the bottom of the frame structure in parallel, the hydraulic cylinders and the material cylinders are connected in pairs, a feeding port, a discharging port and a material cylinder interface are arranged on the valve body, the feeding port is communicated with the material cylinder interface, a first one-way pneumatic valve is arranged on a passage between the feeding port and the material cylinder interface, the material cylinder interface is communicated with the discharging port, a second one-way pneumatic valve is arranged on the passage between the feeding port and the discharging port, the first one-way pneumatic valve and the second one-way pneumatic valve, the oil tank structure and the oil circuit block structure are communicated through an oil pipe, and the oil circuit block structure is connected with the two hydraulic cylinders through the oil pipe, so that the two hydraulic cylinders are controlled to alternately operate and the two material cylinders alternately work.
Furthermore, the valve body is further provided with a first mounting hole and a second mounting hole, the first mounting hole is communicated to a passage between the feed inlet and the material cylinder interface and used for assembling a first one-way pneumatic valve, and the second mounting hole is communicated to a passage between the material cylinder interface and the discharge outlet and used for assembling a second one-way pneumatic valve.
Furthermore, a plurality of thread grooves are arranged on the end face, located on the material cylinder interface, of the valve body in a surrounding mode, and the valve body is connected with a flange plate at the output end of the material cylinder through the thread grooves.
Furthermore, the two valve bodies are mutually symmetrical structures and keep symmetrical after being respectively assembled to the output ends of the two material cylinders, and the discharge ports of the two valve bodies are communicated with the slurry conveying pipe through a T-shaped pipe.
Furthermore, the oil circuit block structure comprises a first-stage oil circuit block and a second-stage oil circuit block, and the first-stage oil circuit block and the second-stage oil circuit block are fixed in the frame structure through oil block supports.
The invention has the beneficial effects that:
the invention adopts the double-cylinder hydraulic pump to pump the mortar in an alternate working mode, can better make up the defect of insufficient pumping power in the trenchless repair of the buried long-distance comprehensive pipe gallery, and has higher working efficiency and longer pumping distance than the traditional single-cylinder hydraulic pump; the two unidirectional pneumatic valves in different directions are adopted in the valve body, so that the automation of feeding and discharging control is realized, a complex additional control system is avoided, the energy conversion rate is improved, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural view (viewed from the front to the back) of a mortar pumping device of the present invention;
FIG. 2 is a schematic structural view (viewed from below to above) of the mortar pumping device of the present invention;
FIG. 3 is a schematic structural view (viewed from left to right) of the mortar pumping device of the present invention;
FIG. 4 is a perspective view of the valve body of the present invention;
FIG. 5 is a right side view of the valve body of the present invention;
fig. 6 is a rear view of the valve body of the present invention.
Description of the labeling: 1. the oil tank comprises a frame structure, 2 parts of a mixing hopper, 3 parts of a flow guide pipe, 4 parts of a valve body, 4-1 parts of a feeding hole, 4-2 parts of a material tank connector, 4-3 parts of a discharging hole, 4-4 parts of a second mounting hole, 4-5 parts of a first mounting hole, 4-6 parts of a thread groove, 5 parts of a T-shaped pipe, 6 parts of a material tank, 7 parts of a hydraulic cylinder, 8 parts of an oil tank structure, 9 parts of a second-stage oil path block, 10 parts of a first-stage oil path block, 11 parts of an oil block support.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1-6, a mortar pumping device for in-situ spray-building repair of a utility tunnel includes a frame structure 1, a mixing hopper 2, two sets of hydraulic cylinders 7, two sets of material cylinders 6, two sets of valve bodies 4, an oil tank structure 8 and an oil way block structure.
The valve body 4 is provided with a feeding port 4-1, a discharging port 4-3 and a material cylinder interface 4-2, the feeding port 4-1 is communicated with the material cylinder interface 4-2, a first one-way pneumatic valve (not shown in the figure) is arranged on a passage between the feeding port 4-1 and the material cylinder interface 4-2, the material cylinder interface 4-2 is communicated with the discharging port 4-3, and a second one-way pneumatic valve (not shown in the figure) is arranged on a passage between the feeding port 4-. The first one-way pneumatic valve and the second one-way pneumatic valve are counter-directional valves. Wherein, the first one-way pneumatic valve plugs the feed inlet 4-1, which can be opened under the action of attraction force and closed under the action of pushing force; the second one-way pneumatic valve plugs the discharge port 4-3, and the second one-way pneumatic valve is closed under the action of attraction force and opened under the action of pushing force.
The feed inlets 4-1 of the two valve bodies 4 are communicated with the mixing hopper 2 through a flow guide pipe 3, the flow guide pipe 3 generally comprises a feed conveying pipe and a connecting pipe, the discharge outlets 4-3 of the two valve bodies 4 are communicated with a slurry conveying pipe, and the material cylinder interfaces 4-2 of the two valve bodies 4 are respectively communicated with the output ends of the two material cylinders 6. In addition, a plurality of thread grooves 4-6 are arranged on the end face, positioned on the material cylinder interface 4-2, of the valve body 4 and surround the material cylinder interface 4-2, and the valve body 4 is connected with a flange plate at the output end of the material cylinder 6 through the thread grooves 4-6.
The oil tank structure 8 is communicated with the oil circuit block structure through an oil pipe, and the oil circuit block structure is connected with the two hydraulic cylinders 7 through the oil pipe, so that the two hydraulic cylinders 7 are controlled to alternately operate, and the two material cylinders 6 alternately work. The hydraulic system can adopt full-automatic control, is easy to operate, has low requirements on operators, and is not repeated in detail in consideration of mature technology.
Referring to fig. 4 and 6, in the above technical solution, a first mounting hole 4-5 and a second mounting hole 4-4 are further provided on the valve body 4, the first mounting hole 4-5 is communicated to a passage between the feed port 4-1 and the material cylinder interface 4-2 for assembling a first one-way pneumatic valve, and the second mounting hole 4-4 is communicated to a passage between the material cylinder interface 4-2 and the discharge port 4-3 for assembling a second one-way pneumatic valve. In principle, the two valve bodies 4 are provided with the same structural features (a feeding port 4-1, a discharging port 4-3, a material cylinder interface 4-2 and the like), but the two valve bodies 4 can be of the same structure or of a symmetrical structure, preferably, the two valve bodies 4 are of a symmetrical structure, the two valve bodies 4 are respectively assembled to the output ends of the two material cylinders 6 and then keep symmetrical, and the discharging ports 4-3 of the two valve bodies 4 are communicated with a slurry conveying pipe through a T-shaped pipe 5.
Specifically, the process of pumping the mortar by adopting the invention is as follows:
the mortar for repairing CCCP is stirred and mixed uniformly in a mixing hopper 2 or the stirred and mixed uniformly CCCP is directly added into a mixing hopper 2, under the action of self weight, the mortar enters a feed inlet 4-1 of a valve body 4 along a guide pipe 3 but is intercepted by a first one-way pneumatic valve, when the material cylinder 6 correspondingly connected with the valve body 4 is under the drawing action, the first one-way pneumatic valve is opened under the action of attraction, conversely, a second one-way pneumatic valve is closed under the attraction, the mortar enters the material cylinder 6 through a feed inlet 4-1-material cylinder interface 4-2 under the action of self weight and negative pressure, when the material cylinder 6 correspondingly connected with the valve body 4 is under the compression action, the mortar is sent out by a piston, the mortar pushes the second one-way pneumatic valve to be opened at the moment, and conversely, the first one-way pneumatic valve is closed under the driving force, at the moment, the mortar enters the T-shaped pipe 5 and enters the mortar conveying pipe through the material cylinder connector 4-2-the discharge hole 4-3 under the pushing action.
In the operation process, the operation directions of the two groups of hydraulic cylinders 7, the operation directions of the two groups of material cylinders 6 and the opening and closing states of the first one-way pneumatic valve and the second one-way pneumatic valve in the valve body 4 are opposite, and mortar is sent out to the mortar conveying pipe from the T-shaped pipe 5 in a pulse mode, so that a longer pumping distance is achieved. The slurry conveying pipe is a hard low-expansion-rate pipeline so as to avoid the phenomenon of cyclic expansion and contraction of the pipeline caused by pulse action.
The invention adopts the double-cylinder hydraulic pump to pump the mortar in an alternate working mode, can better make up the defect of insufficient pumping power in the trenchless repair of the buried long-distance comprehensive pipe gallery, and has higher working efficiency and longer pumping distance than the traditional single-cylinder hydraulic pump; two unidirectional pneumatic valves in different directions are adopted in the valve body 4, so that the automation of feeding and discharging control is realized, a complex additional control system is avoided, the energy conversion rate is improved, and the cost is reduced.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent changes in the principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a mortar pumping device that is used for utility tunnel normal position to spout to build restoration which characterized in that: the mixing device comprises a frame structure, a mixing hopper, two groups of hydraulic cylinders, two groups of material cylinders, two groups of valve bodies, an oil tank structure and an oil way block structure; the frame structure is a cubic framework structure, the mixing hopper is arranged at the top of the frame structure, the two groups of hydraulic cylinders and the two groups of material cylinders are respectively arranged at the bottom of the frame structure in parallel, the hydraulic cylinders and the material cylinders are connected in pairwise combination, the valve body is provided with a feed inlet, a discharge outlet and a material cylinder interface, the feed inlet is communicated with the material cylinder interface, a first one-way pneumatic valve is arranged on a passage between the feed inlet and the material cylinder interface, the material cylinder interface is communicated with the discharge outlet, a second one-way pneumatic valve is arranged on a passage between the feed inlet and the material cylinder interface, the first one-way pneumatic valve and the second one-way pneumatic valve are different-direction valves, the feed inlets of the two groups of valve bodies are communicated with the mixing hopper through a guide pipe, the discharge outlets of the two valve bodies are communicated with a slurry conveying pipe, the material cylinder interfaces of the two valve bodies are, the oil circuit block structure is connected with the two hydraulic cylinders through oil pipes, so that the two hydraulic cylinders are controlled to alternately operate, and the two material cylinders alternately operate.
2. The mortar pumping device for the in-situ spray-building repair of the comprehensive pipe gallery according to claim 1, characterized in that: the valve body is further provided with a first mounting hole and a second mounting hole, the first mounting hole is communicated to a passage between the feed inlet and the material cylinder interface and used for assembling a first one-way pneumatic valve, and the second mounting hole is communicated to a passage between the material cylinder interface and the discharge outlet and used for assembling a second one-way pneumatic valve.
3. The mortar pumping device for the in-situ spray-building repair of the comprehensive pipe gallery according to claim 1 or 2, characterized in that: the end face of the valve body, which is positioned at the material cylinder connector, is provided with a plurality of thread grooves around the material cylinder connector, and the valve body is connected with the flange plate at the output end of the material cylinder through the thread grooves.
4. The mortar pumping device for the in-situ spray-building repair of the comprehensive pipe gallery according to claim 3, characterized in that: the two valve bodies are mutually symmetrical structures and are respectively assembled to the output ends of the two material cylinders to keep symmetrical, and the discharge ports of the two valve bodies are communicated with the slurry conveying pipe through a T-shaped pipe.
5. The mortar pumping device for the in-situ spray-building repair of the comprehensive pipe gallery according to claim 1, characterized in that: the oil circuit block structure comprises a first-stage oil circuit block and a second-stage oil circuit block, and the first-stage oil circuit block and the second-stage oil circuit block are fixed in the frame structure through oil block supports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110265237.2A CN112879262A (en) | 2021-03-11 | 2021-03-11 | Mortar pumping device for in-situ spraying and building repair of comprehensive pipe gallery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110265237.2A CN112879262A (en) | 2021-03-11 | 2021-03-11 | Mortar pumping device for in-situ spraying and building repair of comprehensive pipe gallery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112879262A true CN112879262A (en) | 2021-06-01 |
Family
ID=76040874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110265237.2A Pending CN112879262A (en) | 2021-03-11 | 2021-03-11 | Mortar pumping device for in-situ spraying and building repair of comprehensive pipe gallery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112879262A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2705664A1 (en) * | 1977-02-10 | 1978-08-17 | Schaffner Pumpenanlagen Ag | Piston pump for sludge or solids in suspension - has cylinders in parallel with rotary valves and pressure compensation chamber |
| GB2168437A (en) * | 1984-12-14 | 1986-06-18 | Rossi & Catelli Spa | A positive pump, in particular, for fluid foodstuffs containing solid matter |
| CN203297054U (en) * | 2013-06-19 | 2013-11-20 | 段术全 | Concrete delivery pump |
| CN105781951A (en) * | 2014-12-26 | 2016-07-20 | 中联重科股份有限公司 | Mortar pump control method, device and system and mortar pump |
| CN110639434A (en) * | 2018-06-26 | 2020-01-03 | 住友化学株式会社 | Method for transferring slurry, method for producing polyolefin, and use thereof |
| CN111156145A (en) * | 2020-02-13 | 2020-05-15 | 德州银河机械有限公司 | Piston mud pump and use method thereof |
-
2021
- 2021-03-11 CN CN202110265237.2A patent/CN112879262A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2705664A1 (en) * | 1977-02-10 | 1978-08-17 | Schaffner Pumpenanlagen Ag | Piston pump for sludge or solids in suspension - has cylinders in parallel with rotary valves and pressure compensation chamber |
| GB2168437A (en) * | 1984-12-14 | 1986-06-18 | Rossi & Catelli Spa | A positive pump, in particular, for fluid foodstuffs containing solid matter |
| CN203297054U (en) * | 2013-06-19 | 2013-11-20 | 段术全 | Concrete delivery pump |
| CN105781951A (en) * | 2014-12-26 | 2016-07-20 | 中联重科股份有限公司 | Mortar pump control method, device and system and mortar pump |
| CN110639434A (en) * | 2018-06-26 | 2020-01-03 | 住友化学株式会社 | Method for transferring slurry, method for producing polyolefin, and use thereof |
| CN111156145A (en) * | 2020-02-13 | 2020-05-15 | 德州银河机械有限公司 | Piston mud pump and use method thereof |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210601 |
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