CN106672658B - Guniting pump and using method thereof - Google Patents
Guniting pump and using method thereof Download PDFInfo
- Publication number
- CN106672658B CN106672658B CN201710028979.7A CN201710028979A CN106672658B CN 106672658 B CN106672658 B CN 106672658B CN 201710028979 A CN201710028979 A CN 201710028979A CN 106672658 B CN106672658 B CN 106672658B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/48—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems
- B65G65/4881—Devices for emptying otherwise than from the top using other rotating means, e.g. rotating pressure sluices in pneumatic systems rotating about a substantially horizontal axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G2201/00—Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
- B65G2201/04—Bulk
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
The invention relates to a guniting pump and a using method thereof, and the guniting pump comprises a casing, a blanking hopper and a power system, wherein a rotating shaft driven to rotate by the power system is arranged in the casing, a cylindrical rotor blade frame is arranged in the middle of the rotating shaft, annular support frames which are larger than the rotor blade frame in outer diameter and rotate synchronously with the rotating shaft are arranged at two ends of the rotor blade frame, an even number of blades are uniformly distributed on the side surface of the rotor blade frame along the radial direction, an elastic device for driving two opposite blades to each other to do centrifugal motion along the radial direction of the rotor blade frame is arranged on the rotating shaft, and a plurality of material bins which do not enable materials to seep out are formed among the blades, the support frames, the rotor blade frame and the casing. The device has the advantages of ingenious design, small frictional resistance and large conveying force.
Description
Technical Field
The invention relates to a guniting pump and a using method thereof.
Background
At present, a concrete shotcrete machine mostly adopts a millstone type porous charging extrusion rubber millstone to seal single-hole high-air-pressure pushing discharging, and has the defects that the friction coefficient between sealing rubber and a steel lining plate is large, the friction area is large, most of the power of a motor is used for overcoming the friction force, the mechanical efficiency is extremely low, and the construction time of a construction section is prolonged. Meanwhile, the steel lining plate and the rubber plate for sealing are always in a friction state, so that the steel lining plate and the rubber plate for sealing are easy to wear, the easily damaged parts need to be replaced frequently, the maintenance cost is high, and the labor cost and the construction time are occupied.
Disclosure of Invention
The invention aims to solve the problems in the prior art, namely, the invention provides a slurry spraying pump and a using method thereof, which can carry out high-efficiency slurry spraying operation, and have the advantages of ingenious design and long service life of equipment.
In order to solve the technical problem, one technical scheme of the invention is as follows: a guniting pump comprises a casing, a blanking hopper and a power system, wherein a rotating shaft driven to rotate by the power system is arranged in the casing, a cylindrical rotor blade frame is arranged in the middle of the rotating shaft, annular support frames which are larger than the rotor blade frame in outer diameter and rotate synchronously with the rotating shaft are arranged at two ends of the rotor blade frame, an even number of scraping blades are uniformly distributed on the side surface of the rotor blade frame along the radial direction, an elastic device for driving two opposite scraping blades to do centrifugal motion along the radial direction of the rotor blade frame is arranged on the rotating shaft, a plurality of material seepage-proof material bins are formed among the scraping blades, the support frames, the rotor blade frame and the casing, a track limiting plate fixedly arranged on the casing is arranged at the outer end of the rotor blade frame, a track hole for enabling the scraping blades to do reciprocating motion along the radial direction of the rotor blade frame is arranged on the track limiting plate, and a blanking port communicated with the blanking hopper and the bin at the top of the casing is formed at the top of the casing, a discharge port is formed in the side wall of the bottom of the shell, a scraping plate is arranged at the discharge port, and the scraping plate extends into the side face of a scraping plate frame in the rotor in the storage bin; the supporting frame is characterized in that an annular sealing ring is arranged on the outer side wall of the supporting frame, at least one annular groove is formed in the outer side wall of the sealing ring, a plurality of arc-shaped top plates are uniformly distributed between the sealing ring and the supporting frame along the radial direction, and a plurality of first springs used for jacking the top plates are arranged between the supporting frame and the top plates.
Further, the power system is a motor with a speed reducer.
Furthermore, a material baffle plate which extends into the side surface of the rotor blade scraping frame in the storage bin is arranged on one side of the feed opening far away from the advancing direction of the material, the outer end surface of the rotor scraping frame is hinged with jacking swing rods with the same number as the scraping blades, the bottoms of the two side walls of the scraping blades are respectively provided with a convex shaft penetrating through the rotor scraping frame, the other end of the jacking swing rod is provided with an ejector rod, one end of the ejector rod is in threaded connection with a bolt which abuts against the convex shaft, the other end of the ejector rod is provided with a ball, the ball is supported against the inner side wall of the track hole, and the track hole comprises a first track curve enabling the scraping blade to be in contact with the shell, a climbing curve enabling the scraping blade to move centripetally before entering the scraping plate, a second track curve preventing the scraping blade from colliding with the material baffle plate and the scraping plate and forcing the scraping blade to retract into the rotor scraping frame by overcoming the acting force of the elastic device, and a descending curve enabling the scraping blade to move centrifugally before leaving the material baffle plate and being in contact with the shell.
Furthermore, the elastic device comprises a sleeve penetrating through the rotating shaft, a high-strength second spring is arranged in the sleeve, two ends of the second spring are respectively provided with an ejector block capable of moving along the sleeve, and the ejector block abuts against the bottom end of the scraping blade.
Furthermore, an air inlet communicated with the high-pressure air set is formed in one side of the side wall of the bottom of the machine shell, which is opposite to the discharge port, and an air filtering flow equalizer is arranged in the air inlet.
Further, install vibrating device on the hopper down, vibrating device receives vibrator drive's shale shaker in the hopper including installing the vibrator on hopper lateral wall down and the installation.
Furthermore, the side wall of the casing, which is contacted with the scraping blade, is a detachable anti-abrasion lining plate, and the circumferential side surface of the rotor scraping blade frame, the outer side surface of the scraping blade and the inner side surface of the pump casing are all covered with abrasion-resistant bushings.
Further, the device also comprises an additive pump for applying additives to the discharge hole; a rubber scraper is fastened on the scraper plate through a cover plate, and a mounting hole for mounting the cover plate and the rubber scraper is formed in the casing at the position; the rotor blade rack is characterized in that a through hole for the blade to pass through is formed in the side wall of the rotor blade rack, and a sealing ring is arranged on the inner side wall of the through hole.
In order to solve the technical problem, one technical scheme of the invention is as follows: the use method of the guniting pump comprises the following steps of:
(1) starting a high-pressure air set and an additive pump to ventilate the material bin and the discharge port pipeline;
(2) Starting a power system, driving a rotor blade frame and a support frame to synchronously rotate by a rotating shaft, keeping a blade to do centrifugal motion all the time under the action of a spring, gradually extending the blade out of the rotor blade frame after passing through a material baffle under the limitation of a track limiting plate, pushing the blade to the inner side wall of a shell after rotating through the area of a feed opening, and retracting the blade into the rotor blade frame before passing through a material baffle plate;
(3) and starting the vibrating screen, enabling the materials in the blanking hopper to fall into a bin in the shell under the action of dead weight and the vibrating screen, pushing the bin filled with the materials to a discharge port under the action of scraping force, blowing the materials to the discharge port under the pushing action of high-pressure horizontal wind power, mixing the materials with the additive and then outputting the mixture.
Compared with the prior art, the invention has the following beneficial effects: the device applies a guniting pump with a doctor blade rotor structure which does reciprocating motion along the radial direction of a rotor doctor blade frame, and is suitable for pipeline transportation of fluid plastic substances such as concrete, wet guniting and transportation, mortar transportation, grouting, silt and the like; not only can high-efficient conveying materials such as concrete to can add various additives in the material, design benefit moreover, long service life, simple operation.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a front view schematically showing the configuration of an embodiment of the present invention.
FIG. 2 is a schematic top view of the construction of an embodiment of the present invention.
Fig. 3 is a schematic front view of the structure assembled in the casing in the embodiment of the present invention.
Fig. 4 is a schematic side view of the structure of the inside assembly of the cabinet in the embodiment of the present invention.
FIG. 5 is a schematic structural diagram of a rotating shaft according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an elastic device according to an embodiment of the present invention.
Fig. 7 is a schematic structural diagram of the jacking swing rod and the rail limiting plate in the embodiment of the invention.
Fig. 8 is a schematic structural diagram of a rail limiting plate according to an embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a jacking swing rod in the embodiment of the invention.
FIG. 10 is a front view showing the structure of the support frame in the embodiment of the present invention.
Fig. 11 is a schematic front view showing the configuration of an annular seal ring in the embodiment of the present invention.
In the figure: 1-a machine shell, 101-an anti-abrasion lining plate, 102-an air inlet, 103-an air filtering flow equalizer, 104-a discharge hopper, 105-a mounting hole, 106-a material baffle, 107-a storage bin, 108-a balance cavity, 2-a discharge hopper, 201-a vibrator, 202-a vibrating screen, 3-a rotating shaft, 301-a through hole, 4-a rotor blade frame, 401-a blade, 5-a supporting frame, 501-a wear-resistant bushing, 502-a first spring, 503-a top plate, 6-an elastic device, 601-a sleeve, 602-a second spring, 603-a top block, 7-a material scraper, 701-a rubber scraper, 8-a track limiting plate, 801-a first track curve, 802-a climbing curve, 803-a second track curve, 804-a downhill curve, 9-jacking swing rod, 901-ejector rod, 902-bolt, 903-ball, 10-outer sealing plate, 11-motor, 111-frequency converter, 112-reducer, 12-frame, 13-annular sealing ring, 131-annular groove and 14-additive pump.
Detailed Description
The first embodiment is as follows: as shown in fig. 1 to 11, a guniting pump comprises a frame 12, wherein a casing 1, a blanking hopper 2 and a power system are arranged on the frame, a rotating shaft 3 driven to rotate by the power system is arranged in the casing, a cylindrical rotor blade frame 4 is arranged in the middle of the rotating shaft, annular support frames 5 which are larger than the rotor blade frame in outer diameter and rotate synchronously with the rotating shaft are arranged at two ends of the rotor blade frame, an even number of blades 401 are uniformly distributed on the side surface of the rotor blade frame along the radial direction, an elastic device 6 which drives two opposite blades to do centrifugal motion along the radial direction of the rotor blade frame is arranged on the rotating shaft, a plurality of material bins 107 which do not enable materials to seep out are formed among the blades 401, the support frames 5, the rotor blade frame 4 and the casing 1, a rail limiting plate 8 which is fixedly arranged on the casing is arranged at the outer end of the rotor blade frame, a rail hole which enables the blades to do reciprocating motion along the radial direction of the rotor blade frame is arranged on the rail limiting plate, the top of the shell is provided with a feed opening communicated with the feeding hopper 2 and a top bin, the side wall of the bottom of the shell is provided with a feed opening, the feed opening is connected with a feed hopper 104, the feed opening is provided with a scraping plate 7, and the scraping plate extends into the side face of a scraping plate rack in the inner rotor of the bin; be provided with ring type seal 13 on the support frame lateral wall, be provided with two annular grooves 131 (can reduce the friction) on the lateral wall of sealing washer, it has a plurality of arc top plate 503 to set up along radial equipartition between sealing washer and the support frame, be provided with a plurality of between support frame and the top plate with the first spring 502 of top plate jack-up, the top plate is with the sealing washer jack-up all the time, strengthens sealing performance, ensures that the grout can not ooze.
In this embodiment, the support frame is connected with the rotating shaft in a key mode, and an annular convex part for limiting the rotor blade scraping frame is arranged on the inner end face of the support frame.
In this embodiment, the number of the wiper blades is preferably four.
In this embodiment, the power system is a motor with a speed reducer 112, and a frequency converter 111 is also arranged on the motor 11.
In the embodiment, a material baffle 106 which extends into the side surface of the rotor scraper rack in the storage bin is arranged at one side of the feed opening far away from the material advancing direction, the outer end surface of the rotor scraping frame is hinged with jacking swing rods 9 with the same number as the scraping blades, the bottoms of the two side walls of the scraping blades are provided with protruding shafts penetrating through the rotor scraping frame, the other end of the jacking swing rod is provided with a top rod 901, one end of the top rod is in threaded connection with a bolt 902 which is propped against the convex shaft, the other end of the top rod is provided with a ball 903, the ball is supported against the inner side wall of the track hole, the track hole comprises a first track curve 801 enabling the scraping blade to be in contact with the machine shell, a climbing curve 802 enabling the scraping blade to move centripetally before entering the scraping plate, a second track curve 803 avoiding the collision between the scraping blade and the material baffle plate and enabling the scraping blade to retract into the rotor scraping frame by overcoming the acting force of the elastic device, and a descending curve 804 enabling the scraping blade to move centrifugally before leaving the material baffle plate and being in contact with the machine shell. The rail limiting plate is provided with a key groove fixedly arranged on the machine shell.
In this embodiment, the elastic device includes a sleeve 601 penetrating through the rotating shaft, the rotating shaft is provided with four through holes 301 for installing the sleeve, each two opposite scrapers correspond to two elastic devices, a high-strength second spring 602 is arranged in the sleeve, two ends of the second spring are provided with ejector blocks 603 capable of moving along the sleeve, and the ejector blocks abut against the bottom ends of the scrapers.
In this embodiment, an air inlet 102 communicated with the high pressure air set is formed in a side wall of the bottom of the casing opposite to the discharge port, and an air filtering flow equalizer 103 is arranged in the air inlet.
In this embodiment, the lower hopper is provided with a vibrating device, and the vibrating device comprises a vibrator 201 installed on the outer side wall of the lower hopper and a vibrating screen 202 installed in the lower hopper and driven by the vibrator.
In this embodiment, the side wall of the casing contacting with the wiper blade is a detachable anti-wear lining plate 101, and the circumferential side surface of the rotor wiper blade frame, the outer side surface of the wiper blade and the inner side surface of the pump casing are all covered with wear-resistant bushings 501.
In this embodiment, the device further comprises an additive pump 14 for applying an additive to the discharge port; a rubber scraper 701 is fastened on the scraper plate through a cover plate, and a mounting hole 105 for mounting the cover plate and the rubber scraper is formed in the machine shell at the position; the rotor blade rack is characterized in that a through hole for the blade to pass through is formed in the side wall of the rotor blade rack, and a sealing ring is arranged on the inner side wall of the through hole.
In this embodiment, the casing is the tube-shape, and its both ends all are provided with outer shrouding 10, be provided with the bearing support and the seal assembly of articulated pivot on the outer shrouding.
The method comprises the following steps:
(1) starting a high-pressure air set and an additive pump to ventilate the material bin and the discharge port pipeline;
(2) starting a power system, driving a rotor blade frame and a support frame to synchronously rotate by a rotating shaft, keeping a blade to do centrifugal motion all the time under the action of a spring, gradually extending the blade out of the rotor blade frame after passing through a material baffle under the limitation of a track limiting plate, pushing the blade to the inner side wall of a shell after rotating through the area of a feed opening, and retracting the blade into the rotor blade frame before passing through a material baffle plate;
(3) and starting the vibrating screen, enabling the materials in the blanking hopper to fall into a bin in the shell under the action of dead weight and the vibrating screen, pushing the bin filled with the materials to a discharge port under the action of scraping force, blowing the materials to the discharge port under the pushing action of high-pressure horizontal wind power, mixing the materials with the additive and then outputting the mixture.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (8)
1. The utility model provides a guniting pump which characterized in that: the automatic scraper device comprises a casing, a blanking hopper and a power system, wherein a rotating shaft driven to rotate by the power system is arranged in the casing, a cylindrical rotor scraper rack is arranged in the middle of the rotating shaft, annular support frames which are larger than the rotor scraper rack in outer diameter and rotate synchronously along with the rotating shaft are arranged at two ends of the rotor scraper rack, an even number of scrapers are uniformly distributed on the side surface of the rotor scraper rack along the radial direction, an elastic device for driving two opposite scrapers to do centrifugal motion along the radial direction of the rotor scraper rack simultaneously is arranged on the rotating shaft, a plurality of material bins which do not enable materials to seep out are formed between the scrapers, the support frames, the rotor scraper rack and the casing, a track limiting plate fixedly arranged on the casing is arranged at the outer end of the rotor scraper rack, a track hole for enabling the scrapers to do reciprocating motion along the radial direction of the rotor scraper rack is arranged on the track limiting plate, a blanking port communicated with the material bins at the top of the blanking hopper is arranged at the top of the casing, a discharge port is formed in the side wall of the bottom of the shell, a scraping plate is arranged at the discharge port, and the scraping plate extends into the side face of a scraping plate frame in the rotor of the storage bin; the outer side wall of the support frame is provided with an annular sealing ring, the outer side wall of the sealing ring is provided with at least one annular groove, a plurality of arc-shaped top plates are uniformly distributed between the sealing ring and the support frame along the radial direction, and a plurality of first springs for jacking the top plates are arranged between the support frame and the top plates;
A material baffle plate which extends into the side surface of a scraping plate frame in the rotor in the storage bin is arranged on one side of the feed opening far away from the advancing direction of the material, the outer end surface of the rotor scraping frame is hinged with jacking swing rods with the same number as the scraping blades, the bottoms of the two side walls of the scraping blades are respectively provided with a convex shaft penetrating through the rotor scraping frame, the other end of the jacking swing rod is provided with an ejector rod, one end of the ejector rod is in threaded connection with a bolt which abuts against the convex shaft, the other end of the ejector rod is provided with a ball, the ball is propped against the inner side wall of the track hole, and the track hole comprises a first track curve which enables the scraping blade to be contacted with the shell, a climbing curve which enables the scraping blade to do centripetal motion before entering the scraping plate, a second track curve which avoids the collision of the scraping blade with the material baffle plate and the scraping plate and forces the scraping blade to overcome the acting force of an elastic device and retract the scraping blade into the rotor scraping blade frame, and a downhill curve which enables the scraping blade to do centrifugal motion before leaving the material baffle plate and being contacted with the shell;
the support frame is connected with the rotating shaft in a key mode, and an annular convex portion for limiting the rotor scraping frame is arranged on the inner end face of the support frame.
2. The slurry pump of claim 1, wherein: the power system is a motor with a speed reducer.
3. The slurry pump of claim 1, wherein: the elastic device comprises a sleeve penetrating through the rotating shaft, a high-strength second spring is arranged in the sleeve, two ends of the second spring are respectively provided with an ejector block capable of moving along the sleeve, and the ejector block abuts against the bottom end of the scraping blade.
4. The guniting pump according to claim 3, wherein: and an air inlet communicated with the high-pressure air set is formed in one side of the side wall of the bottom of the machine shell, which is opposite to the discharge port, and an air filtering flow equalizer is arranged in the air inlet.
5. The guniting pump according to claim 4, wherein: and the lower hopper is provided with a vibrating device, and the vibrating device comprises a vibrator arranged on the outer side wall of the lower hopper and a vibrating screen driven by the vibrator in the lower hopper.
6. The slurry pump of claim 1, wherein: the side wall of the casing, which is contacted with the scraping blade, is a detachable anti-abrasion lining plate, and the circumferential side surface of the rotor scraping blade frame, the outer side surface of the scraping blade and the inner side surface of the pump shell are all covered with anti-abrasion bushings.
7. The slurry pump of claim 5, wherein: the additive pump is used for applying additives to the discharge hole; a rubber scraper is fastened on the scraper plate through a cover plate, and a mounting hole for mounting the cover plate and the rubber scraper is formed in the casing at the position; the rotor blade rack is characterized in that a through hole through which the blade passes is formed in the side wall of the rotor blade rack, and a sealing ring is arranged on the inner side wall of the through hole.
8. The method of using the slurry pump of claim 7, comprising the steps of:
(1) Starting a high-pressure air set and an additive pump to ventilate the material bin and the discharge port pipeline;
(2) starting a power system, driving a rotor blade frame and a support frame to synchronously rotate by a rotating shaft, keeping a blade to do centrifugal motion all the time under the action of a spring, gradually extending the blade out of the rotor blade frame after the blade passes through a material baffle under the limitation of a track limiting plate, propping against the inner side wall of a machine shell after the blade rotates through the area of a feed opening, and retracting the blade frame before passing through a material scraper plate;
(3) and starting the vibrating screen, enabling the materials in the blanking hopper to fall into a bin in the shell under the action of dead weight and the vibrating screen, pushing the bin filled with the materials to a discharge port under the action of scraping force, blowing the materials to the discharge port under the pushing action of high-pressure horizontal wind power, mixing the materials with the additive and then outputting the mixture.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028979.7A CN106672658B (en) | 2017-01-16 | 2017-01-16 | Guniting pump and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710028979.7A CN106672658B (en) | 2017-01-16 | 2017-01-16 | Guniting pump and using method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN106672658A CN106672658A (en) | 2017-05-17 |
| CN106672658B true CN106672658B (en) | 2022-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710028979.7A Active CN106672658B (en) | 2017-01-16 | 2017-01-16 | Guniting pump and using method thereof |
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| CN (1) | CN106672658B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111974681A (en) * | 2020-08-20 | 2020-11-24 | 马鞍山金瓦格机械科技有限公司 | Plastic particle screening device with re-screening function and working method |
| CN113928830B (en) * | 2021-10-15 | 2023-03-07 | 宣汉正原微玻纤有限公司 | Equivalent blanking device for fiber production |
| CN115646731B (en) * | 2022-11-11 | 2023-05-16 | 东莞市欣美电子材料有限公司 | Lithium battery termination adhesive tape coating machine and coating method thereof |
| CN117509014B (en) * | 2024-01-05 | 2024-03-15 | 四川省机械研究设计院(集团)有限公司 | Automatic feeding device for mechanical parts |
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| GB2089189A (en) * | 1980-12-10 | 1982-06-23 | Molins Ltd | Continuous pneumatic tobacco feed |
| US5069608A (en) * | 1988-04-27 | 1991-12-03 | Nordischer Mashinenbau Rud. Baader Gmbh & Co Kg | Vane pump for delivering pasty substances |
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| GB2089189A (en) * | 1980-12-10 | 1982-06-23 | Molins Ltd | Continuous pneumatic tobacco feed |
| US5069608A (en) * | 1988-04-27 | 1991-12-03 | Nordischer Mashinenbau Rud. Baader Gmbh & Co Kg | Vane pump for delivering pasty substances |
| CN102606291A (en) * | 2011-01-23 | 2012-07-25 | 梁天宇 | Engine |
| CN202991470U (en) * | 2012-10-25 | 2013-06-12 | 王德忠 | Double-rotor blade-type hydraulic pump with lateral walls of rotors free of friction from blades |
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| CN106672658A (en) | 2017-05-17 |
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