AU2018357831A1

AU2018357831A1 - Conveying pump apparatus for immobile high viscosity paste

Info

Publication number: AU2018357831A1
Application number: AU2018357831A
Authority: AU
Inventors: Wanxing REN; Jingtai SHI; Shihua Wang; Dehua WEN; Qiankun Zhao
Original assignee: Xuzhou Jian Mining Technology Co Ltd; China University of Mining and Technology CUMT
Current assignee: Xuzhou Ji'an Mining Technology Co Ltd; China University of Mining and Technology CUMT
Priority date: 2018-06-06
Filing date: 2018-07-10
Publication date: 2020-01-02
Anticipated expiration: 2038-07-10
Also published as: CN108799039B; CN108799039A; WO2019232886A1; AU2018357831B2

Abstract

A conveying pump apparatus for immobile high viscosity paste includes a motor disposed on a chassis, an oil pump, an energy accumulator, a reversing valve, a hydraulic cylinder, material cylinders, an oil tank, a cooler, and a suction and exhaust valve group. The suction and exhaust valve group includes two forcedly switched suction and exhaust valves each connected through a tee. Each of the forcedly switched suction and exhaust valves includes two strong controllable valves connected through a U-shaped pipe. Each of the strong controllable valves includes a drive oil cylinder, a support sleeve, an upper valve body member, a lower valve body member, an upper valve seat, a lower valve seat, a movable valve block, and a valve rod that are connected hermetically. The oil pump is driven by the motor to extract oil from the oil tank. The oil flows into a two-position five-way valve through the reversing valve, then respectively flows into the hydraulic cylinder and the drive oil cylinders at the same time, along with reciprocating motions of a hydraulic cylinder piston and the drive oil cylinder pistons, flows back to the reversing valve through the two-position five-way valve, and finally flows back to the oil tank through the cooler. The present invention can pump a super viscous medium, the suction and exhaust valves can be highly synchronized with operation of a hydraulic cylinder piston without being affected by differential pressures and viscosity of the medium, and the conveying pump may be assembled, disassembled, and transported conveniently.

Description

DESCRIPTION

CONVEYING PUMP APPARATUS FOR IMMOBILE HIGH VISCOSITY PASTE

FIELD OF THE INVENTION [0001] The present invention relates to a hydraulic grouting pump, and in particular, to a conveying pump apparatus for high viscosity paste, and is particularly suitable for a downhole fire fighting project to pump gelatinous fire prevention and fighting materials.

DESCRIPTION OF RELATED ART [0002] To prevent and cure freely burning fires in mined areas, remaining coal in the mined areas needs to be cooled by grouting, fissures with air leakage need to be blocked, and at the same time, grouting pipelines need to be prevented from being blocked. In consideration of the foregoing objective and conditional restrictions, grouted paste shall have features such as high viscosity, immobility, and no solidification.

[0003] In the 1980s, a coal mining industry related scientific research institution has developed a corresponding grouting material, but met a difficulty in an application process, that is, efficient pumping cannot be realized after immobile high viscosity paste satisfying the requirements is prepared.

[0004] The reasons lie in that, a common hydraulic grouting pump suctions and exhausts paste by using a one-way valve structure, uses a valve plate or a steel ball as a sealing element, implements an action function depending on a differential pressure, and can pump a low-viscosity clean medium with a viscosity value below 20,000 mPa.s. However, when paste is immobile, a viscosity value is usually higher than 800,000 mPa.s, and if this kind of paste is pumped by the common grouting pump, a problem that the one-way valve structure fails may occur, and pumping requirements cannot be realized.

DESCRIPTION

SUMMARY OF THE INVENTION

Technical Problem [0005] To overcome the defect in the prior art, the present invention provides a conveying pump apparatus for immobile high viscosity paste that can pump a super viscous medium. Suction and exhaust valves can be highly synchronized with operation of a hydraulic cylinder piston without being affected by differential pressures and viscosity of the medium, and can perform connection and disconnection actions accurately. The conveying pump can avoid internal leakage, cause less paste deposition, perform long distance transportation. The conveying pump suffers no risk of grouting overpressure and may be assembled, disassembled, and transported conveniently.

Technical Solution [0006] To solve the foregoing technical problem, the present invention uses the following technical solution. The conveying pump apparatus for immobile high viscosity paste includes a motor, an oil pump, a hydraulic cylinder, material cylinders, an oil tank, a reversing valve, and a suction and exhaust valve group, where the motor is connected to and drives the oil pump, the oil pump conveys high-pressure oil in the oil tank to the hydraulic cylinder through the reversing valve, the hydraulic cylinder drives the suction and exhaust valve group to pump paste in the material cylinders, and return oil in the hydraulic cylinder flows into the oil tank through the reversing valve again; the suction and exhaust valve group includes two forcedly switched suction and exhaust valves each connected through a tee, a port at a lower end of each of the tees is a valve group material suction port, each of the forcedly switched suction and exhaust valves includes two strong controllable valves connected through a U-shaped pipe; each of the strong controllable valves includes a drive oil cylinder, a support sleeve, an upper valve body member, a lower valve body member, an upper valve seat, a lower valve seat, a movable valve block, and a valve rod that are connected hermetically, the drive oil cylinder is connected to a flange I and a flange II at two ends through bolts; the upper valve body member is welded to a flange III; the upper valve body member and the lower valve body member are connected to the flange II through a bolt sheathed with the support sleeve; the valve rod sequentially passes through the upper valve seat,

DESCRIPTION the upper valve body member, and the flange II from the lower valve body member from bottom to top, the upper valve seat and the lower valve seat are located in an inner cavity of the lower valve body member, and are respectively fixed on the flange III and the lower valve body member, the movable valve block is connected to a lower end of the valve rod through a thread and located between the upper valve seat and the lower valve seat, and an upper end of the valve rod is fixed on a drive oil cylinder piston; an upper oil port and a lower oil port are respectively disposed on the drive oil cylinder, and the upper oil port and the lower oil port are respectively in communication with an oil cavity above the drive oil cylinder piston and an oil cavity under the drive oil cylinder piston; the lower valve body member has a material cylinder interface and a lower end port that are in communication with one of the material cylinders; a U-shaped pipe interface extends out from a side portion of the upper valve body member, a lower end of the U-shaped pipe interface is in communication with the inner cavity of the lower valve body member, the two strong controllable valves are in communication with each other through the U-shaped pipe interface, and the lower end ports of the two strong controllable valves are in communication with the valve group material suction port, to form one of the forced switching suction and exhaust valves; a material discharge interface at one side of each of the two upper valve body members is connected to the tee through the U-shaped pipe, and the U-shaped pipe between the Ushaped pipe interfaces of each of the two forcedly switched suction and exhaust valves is connected through the tee, to become the suction and exhaust valve group as a whole; the hydraulic cylinder located in a middle portion is connected to the two material cylinders at two ends, to form a hydraulic cylinder material cylinder assembly, a hydraulic cylinder piston and two material cylinder plungers are connected through a plunger rod, cavities at two sides of the hydraulic cylinder piston are connected to a two-position five-way valve through an oil inlet port and an oil outlet port; the twoposition five-way valve is further included, the two-position five-way valve includes a valve body, an upper oil passage and a lower oil passage located in the valve body are disposed in parallel and are not in communication with each other, an oil inlet hole of the upper oil passage and an oil backflow hole of the lower oil passage are in opposite directions and are respectively located at two sides of the valve body, the upper oil passage and the lower oil passage respectively have five side oil holes that are disposed

DESCRIPTION alternately, and furthermore, the side oil holes of the upper oil passage and the side oil holes of the lower oil passage are also arranged alternately; the oil inlet hole of the upper oil passage of the two-position five-way valve is in communication with an oil outlet port of the reversing valve, the five side oil holes of the upper oil passage are respectively in communication with the hydraulic cylinder oil inlet port, upper oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and lower oil ports of the drive oil cylinders of the left strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group; the oil backflow hole of the lower oil passage of the two-position five-way valve is in communication with an oil backflow port of the reversing valve, and the five side oil holes of the lower oil passage are respectively in communication with the hydraulic cylinder oil outlet port, lower oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and upper oil ports of the drive oil cylinders of the left strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group.

Advantageous Effect [0007] Compared with the prior art, the present invention has following advantageous effects. The conveying pump apparatus in the present invention has double material cylinders and double functions, that is, can not only pump a single-component medium, but also pump a double-component medium according to a ratio 1:1. Two-position and three-way strong controllable valves driven by high-pressure oil and the material cylinder plungers act synchronously, a valve group material suction port is closed forcedly to block backflow of suctioned materials at the moment that a material suction cavity of the material cylinder stops material suction, and at the same time, a material discharge port is opened. A material discharge interface is forcedly closed to block backflow of discharged materials at the moment that a material discharge cavity of the material cylinder stops material discharge, and at the same time, a valve group material suction port of the cavity is opened, to realize pumping of a high viscosity medium without internal leakage. The drive oil cylinders and the material cylinders share the oil inlet passage and oil return passage and are not affected by differential pressure of the

DESCRIPTION pumped medium at the inlet and outlet ports and the viscosity, the material cylinder plungers and the valves operate synchronously, and connection and disconnection actions are performed accurately. The present invention uses a working medium (paste and oil) to transmit a pressure signal, to form closed-loop automatic control and avoid a risk of grouting overpressure. In addition, the present invention may be disassembled into several modules to be moved to mine respectively, and can be assembled conveniently on site.

BRIEF DESCRIPTION OF THE DRAWINGS [0008] The present invention will be further described with reference to the accompanying drawings and embodiments;

[0009] FIG. 1 is a three-dimensional diagram of an embodiment of the present invention with tees omitted;

[0010] FIG. 2 is a rear view of FIG. 1 with the tees omitted;

[0011] FIG. 3 is a schematic structural diagram of a strong controllable valve according to an embodiment of the present invention;

[0012] FIG. 4 is a schematic structural diagram of a combination of a suction and exhaust valve group and a hydraulic cylinder material cylinder assembly according to an embodiment of the present invention;

[0013] FIG. 5 is a diagram showing a working principle of connecting a suction and exhaust valve group, a hydraulic cylinder material cylinder assembly, and a twoposition five-way valve according to an embodiment of the present invention with the tees omitted, where an upper layer and a lower layer of the two-position five-way valve are abstracted as an upper passage and a lower passage of the two-position five-way valve; and to describe the internal structure of the strong controllable valve clearly, interfaces of the material cylinders are drawn symmetrically, during actual connection, the interfaces of the two material cylinders are parallel and in a direction perpendicular to a valve group material suction port, and each of the strong controllable valves is connected inward to the material cylinders in a direction perpendicular to the picture; and ______________DESCRIPTION [0014] FIG. 6 is a schematic structural diagram of a two-position five-way valve according to an embodiment of the present invention.

In FIG. 1 and FIG. 2,

1. Forcedly switched suction and exhaust valve

2. Oil tank

3. Motor

4. Two-position five-way valve

5. Oil pump

6. Energy accumulator

7. Chassis

8. Reversing valve (FIG. 2)

9. Hydraulic cylinder material cylinder assembly

10. Cooler

In FIG. 3 to FIG. 6,

4-1. One-way throttle valve

4-2. Oil port joint

11. Upper oil port

12. Drive oil cylinder piston

13. Drive oil cylinder

13-1. Valve rod

13-2. Cylinder body of the drive oil cylinder

14. Lower oil port _ _________DESCRIPTION

15. Support sleeve

16. Upper valve body member

16-1. Sealing member

16-2. Sealing gland

17. U-shaped pipe interface

18. Upper valve seat

19. Lower valve body member

20. Movable valve block

21. Lower valve seat

22. Lower end port

23. Material cylinder interface

24. Flange III

25. Flange II

26. Flange I

27. Material cylinder

27- 1. Material cylinder plunger

28. Hydraulic cylinder

28- 1. Hydraulic cylinder oil inlet

28-2. Hydraulic cylinder oil outlet

28-3. Hydraulic cylinder piston

29. Valve group material suction port

30. U-shaped pipe

31. Tee

DESCRIPTION

31-1 Material discharge interface

32. Strong controllable valve

33. Upper layer of the two-position five-way valve

34. Lower layer of the two-position five-way valve

35. Upper oil passage

35-1. Oil inlet hole of the upper oil passage

35- 2. Side oil holes of the upper oil passage

36. Lower oil passage

36- 1. Oil backflow hole of the lower oil passage

36-2. Side oil hole of the lower oil passage

DETAILED DESCRIPTION OF THE INVENTION [0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention be more clear and comprehensible, the technical solution in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] In an embodiment in FIG. 1 and FIG. 2, a conveying pump apparatus for immobile high viscosity paste includes a motor 3 installed on a chassis 7, an oil pump 5, an energy accumulator 6, a reversing valve 8, a hydraulic cylinder 28, material cylinders 27, a cooler 10, an oil tank 2, and a suction and exhaust valve group. The suction and exhaust valve group includes two forcedly switched suction and exhaust valves each connected through a tee 31, a port at a lower end of each of the tees 31 is a valve group material suction port 29, each of the forcedly switched suction and exhaust

DESCRIPTION valves includes two strong controllable valves 32 connected through a U-shaped pipe

30. The conveying pump apparatus further includes an energy accumulator 6 and a cooler 10, the energy accumulator 6 is installed between an oil outlet port of the oil pump 5 and an oil inlet port of the reversing valve 8, the reversing valve 8 is installed between the energy accumulator 6 and the two-position five-way valve 4, the cooler 10 is installed between an oil backflow port of the reversing valve 8 and the oil tank 2, the two-position five-way valve 4 is installed among the hydraulic cylinder 28, the drive oil cylinders 13 of the suction and exhaust valve group, and the reversing valve 8. The motor 3 is connected to and drives the oil pump 5, the oil pump 5 extracts oil in the oil tank 2 and conveys the oil in the oil tank 2 to the energy accumulator 6 under a high pressure, the oil sequentially flows into the reversing valve 8 and an upper layer 33 of the two-position five-way valve, the high-pressure oil flowing out of the upper layer 33 of the two-position five-way valve flows into the hydraulic cylinder 28 and the oil inlet ports of the drive oil cylinders of the left and right of the two forced switching suction and exhaust vales; the hydraulic cylinder 28 and the oil backflow ports of the drive oil cylinders of the left and right of the two forced switching suction and exhaust vales^the lower layer 33 of the two-position five-way valve-Ahe oil backflow port of the reversing valve 8-> the cooler 10->the oil tank 2.

[0017] As shown in FIG. 3, each of the strong controllable valves 32 includes a drive oil cylinder 13, a valve rod 13-1, a support sleeve 15, an upper valve body member 16, a lower valve body member 19, an upper valve seat 18, a lower valve seat 21, a movable valve block 20, and the like that are connected hermetically; the drive oil cylinder 13 is connected to a flange 126 and a flange II25 at two ends through bolts; the upper valve body member 16 includes a sealing member 16-1, an upper valve body, and a sealing gland 16-2, the upper valve body is formed by welding a sealing body, an elbow element, and a joint on the flange III 24, the sealing body is disposed on an upper portion of the elbow element and a center of the sealing body is coaxial with a center line of the flange III 24, the joint is disposed on a small end of the elbow element and a center line of the joint is perpendicular to the center line of the flange III, and the sealing member 16-1 is installed in the sealing body, and pressed tightly by the sealing gland 16-2, to seal the valve rod 13-1; the upper valve body member 16 and the lower valve _____ DESCRIPTION body member 19 are connected to the flange II 25 through a bolt sheathed with the support sleeve 15; the valve rod 13-1 sequentially passes through the upper valve seat 18, the upper valve body member 16, and the flange II 25 from the lower valve body member 19 from bottom to top, the upper valve seat 18 and the lower valve seat 21 are located in an inner cavity of the lower valve body member 19, and are respectively fixed on the flange III 24 and the lower valve body member 19, the movable valve block 20 is connected to a lower end of the valve rod 13-1 through a thread and located between the upper valve seat 18 and the lower valve seat 21, and an upper end of the valve rod 13-1 is fixed on a drive oil cylinder piston 12; an upper oil port 11 and a lower oil port 14 are respectively disposed on the drive oil cylinder 13, and the upper oil port and the lower oil port are respectively in communication with an oil cavity above the drive oil cylinder piston 12 and an oil cavity under the drive oil cylinder piston 12; the lower valve body member 19 has a material cylinder interface 23 and a lower end port 22 that are in communication with one of the material cylinders 27; a U-shaped pipe interface 17 extends out from a side portion of the upper valve body member 16, a lower end of the U-shaped pipe interface 17 is in communication with the inner cavity of the lower valve body member 19, the two strong controllable valves 32 are in communication with each other through the U-shaped pipe interface 17, and the lower end ports 22 of the two strong controllable valves 32 are in communication with the valve group material suction port 29, to form one of the forcedly switching suction and exhaust valves; a material discharge interface 31-1 at one side of each of the two upper valve body members 16 is connected to the tee 31 through the U-shaped pipe 30, and the Ushaped pipe 30 between the U-shaped pipe interfaces 17 of each of the two forcedly switched suction and exhaust valves is connected through the tee 31, to become the suction and exhaust valve group as a whole.

[0018] Referring to FIG. 4, the hydraulic cylinder 28 located in a middle portion is connected to the two material cylinders 27 at two ends, to form a hydraulic cylinder material cylinder assembly 9, a hydraulic cylinder piston 28-3 and two material cylinder plungers 27-1 are connected through a plunger rod, cavities at two sides of the hydraulic cylinder piston 28-3 are connected to a two-position five-way valve 4 through a hydraulic cylinder oil inlet port 28-1 and a hydraulic cylinder oil outlet port 28-2.

DESCRIPTION [0019] Referring to FIG. 5 and FIG. 6, the two-position five-way valve 4 is further included, the two-position five-way valve 4 includes a valve body, a one-way throttle valve and an oil port joint; the one-way throttle valve is installed between the valve body and the oil port joint, specifically, the one-way throttle valve is installed at the side oil holes, the oil port joint is installed at a lower end of the one-way throttle valve, and a speed for opening and closing the strong controllable valves is adjusted by adjusting an opening degree of the one-way throttle valve; an upper oil passage 35 and a lower oil passage 36 located in the valve body are disposed in parallel and are not in communication with each other, an oil inlet hole 35-1 of the upper oil passage 35 and an oil backflow hole 36-1 of the lower oil passage 36 are in opposite directions and are respectively located at two sides of the valve body, the upper oil passage 35 and the lower oil passage 36 respectively have five side oil holes that are disposed alternately, and furthermore, the side oil holes 35-2 of the upper oil passage and the side oil holes 36-2 of the lower oil passage are also arranged alternately. As shown in FIG. 5, the oil inlet hole 35-1 of the upper oil passage 35 of the two-position five-way valve 4 is in communication with an oil outlet port of the reversing valve 8, the five side oil holes of the upper oil passage 35 are respectively in communication with the hydraulic cylinder oil inlet port 28-1, upper oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and lower oil ports of the drive oil cylinders of the left strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group; the oil backflow hole 36-1 of the lower oil passage 36 of the twoposition five-way valve 4 is in communication with an oil backflow port of the reversing valve 8, and the five side oil holes of the lower oil passage 36 are respectively in communication with the hydraulic cylinder oil outlet port 28-2, lower oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and upper oil ports of the drive oil cylinders of the left strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group.

[0020] Referring to FIG. 3, a sealing method of the conveying pump apparatus in this embodiment is described as follows. The hydraulic cylinder piston 28-3 is sealed with

DESCRIPTION a cylinder body, a piston rod of the hydraulic cylinder 28 is sealed with a hydraulic flange for connecting to each of the material cylinders 27, each of the material cylinder plungers 27-1 is sealed with a cylinder body and a material cylinder flange for connecting to the hydraulic cylinder 28, the drive oil cylinder piston 12 of each of the strong controllable valves 32 is sealed with a cylinder body, the flange I 26 and the flange II25 are sealed with a cylinder body 13-2 of the drive oil cylinder, the flange II 25 is sealed with the valve rod 13-1, and the upper valve body member 16 is sealed with the valve rod 13-1. The foregoing members are sealed by using Yx seal rings for holes, V type combined seal, Step seal, Glyd-seal, and so on. The flange III 24 and the lower valve body member 19 are sealed through an O-shaped rubber seal ring.

[0021] The working principle of this embodiment of the present invention is described as follows. (Precondition: two strong controllable valves fonning the left forcedly switched suction and exhaust valve are Valve 1 and Valve 2, the upper oil port and the lower oil port of Valve 1 are respectively represented by 11 and 12, the upper oil port and the lower oil port of Valve 2 are respectively represented by 21 and 22, two strong controllable valves forming the right forcedly switched suction and exhaust valve are Valve 3 and Valve 4, the upper oil port and the lower oil port of Valve 3 are respectively represented by 31 and 32, and the upper oil port and the lower oil port of Valve 4 are respectively represented by 41 and 42).

[0022] As shown in FIG. 4 and FIG. 5, when high-pressure oil flows into the hydraulic cylinder oil inlet 28-1 through the upper oil passage 35 of the two-position five-way valve 4, to push the hydraulic cylinder piston 28-3 to move from left to right, the spaces at the left sides of the two material cylinder plungers 27-1 of the left and right material cylinders 27 become larger to form negative pressure zones, the connected Valve 1 and Valve 3 act and then are located at an upper valve position (a paste outlet port is closed and a paste suction port is opened), the paste is respectively suctioned into material chambers at the left sides of the two material cylinder plungers 27-1; at the same time, the spaces at the right sides of the two material cylinder plungers 27-1 become smaller to form high-pressure zones, the connected Valve 2 and Valve 4 act and then are located at a lower valve position (the paste outlet port is opened and the paste suction port is closed), the paste is respectively pumped from material chambers at the left sides of the

DESCRIPTION two material cylinder plungers 27-1 under a high pressure; when the hydraulic cylinder piston 28-3 moves from right to left, negative pressure zones are formed at the right sides of the two material cylinder plungers 27-1 of the left and right material cylinders 27, Valve 2 and Valve 4 act and then are located at an upper valve position (the paste outlet port is closed and the paste suction port is opened), the paste is respectively suctioned into the material chambers at the right sides of the two material cylinder plungers 27-1; at the same time, high-pressure zones are formed at the left sides of the two material cylinder plungers 27-1, Valve 1 and Valve 3 act and are located at a lower valve position (the paste outlet port is opened and the paste suction port is closed), the paste is respectively pumped from the material chambers at the left sides of the two material cylinder plungers 27-1 under a high pressure. The process is performed repeatedly, the hydraulic cylinder piston 28-3 makes reciprocating motions ceaselessly, and the four strong controllable valves 32 cooperate with the hydraulic cylinder piston 28-3 organically, to finish continuous suction and exhaust operations of the paste smoothly. The reciprocating motions of the hydraulic cylinder piston 28-3 are controlled by reciprocating changes of oil inflow and backflow in the lower oil passage 36 of the two-position five-way valve 4, when the oil flows into the upper oil passage 35, the oil flows back from the lower oil passage 36, and when the oil flows back from the upper oil passage 35, the oil flows into the lower oil passage 36, such reciprocating changes are controlled by the reversing valve 8.

[0023] In addition, when high-pressure liquid oil flows in from the upper layer 33 of the two-position five-way valve, the high-pressure liquid oil respectively flows toward the hydraulic cylinder oil inlet 28-1 at the left side of the hydraulic cylinder 28, the lower oil ports 12 and 32 of Valve 1 and Valve 3, and the upper oil ports 21 and 41 of Valve 2 and Valve 4, so that the original oil at the right side of the hydraulic cylinder piston 28-3 flows back from the 28-2 oil port to the lower layer 34 of the two-position five-way valve, and then flows back to the oil tank 2 through the reversing valve 8 and the cooler 10. At the same time, the lower oil ports 12 and 32 of Valve 1 and Valve 3 obtain oil to drive the drive oil cylinder piston 12 to move toward the upper valve position (the paste outlet port is closed and the paste suction port is opened), at the same time, the upper oil ports 21 and 41 of Valve 2 and Valve 4 obtain oil to drive the drive

DESCRIPTION oil cylinder piston 12 to move toward the lower valve position (the paste outlet port is opened and the paste suction port is closed), at the same time, liquid oil in the oil cavities at the other sides of the drive oil cylinder pistons 12 of Valve 1 to Valve 4 flows back from the upper oil ports 11 and 31 and the lower oil ports 22 and 42 to the lower layer 34 of the two-position five-way valve, and flows back to the oil tank 2 through the reversing valve 8 and the cooler 10. When the reversing valve 8 finishes reversing and the high-pressure liquid oil flows in from the lower layer 34 of the two-position fiveway valve, the high-pressure liquid oil respectively flows toward the hydraulic cylinder oil outlet 28-2 at the right side of the hydraulic cylinder 28, the upper oil ports 11 and 31 of Valve 1 and Valve 3, and the lower oil ports 22 and 42 of Valve 2 and Valve 4, so that the original oil at the left side of the hydraulic cylinder piston 28-3 flows back from the 28-1 oil port to the upper layer 33 of the two-position five-way valve, and flows back to the oil tank 2 through the reversing valve 8 and the cooler 10. At the same time, the upper oil ports 11 and 31 of Valve 1 and Valve 3 obtain oil to drive the drive oil cylinder piston 12 to move toward the lower valve position (the paste outlet port is opened and the paste suction port is closed), at the same time, the lower oil ports 22 and 42 of Valve 2 and Valve 4 obtain oil to drive the drive oil cylinder piston 12 to move toward the upper valve position (the paste outlet port is closed and the paste suction port is opened), and at the same time, Valve 1 to Valve 4 drive the liquid oil in the oil cavities at the other sides of the drive oil cylinder pistons 12 to flow back from the lower oil ports 12 and 32 and the upper oil ports 21 and 41 to the upper layer 33 of the two-position five-way valve, and flows back to the oil tank 2 through the reversing valve 8 and the cooler 10.

[0024] The present invention can pump a super viscous medium with a dynamic viscosity up to a million mPa.s; the suction and exhaust valve group can be highly synchronized with operation of a hydraulic cylinder piston 28-3 without being affected by differential pressures and viscosity of the medium, and connection and disconnection actions are performed accurately. Since the specially designed forcedly switched suction and exhaust valves are used, internal leakage is avoided, less paste deposition is caused, and long distance transportation can be performed. The present invention uses a working medium (paste and oil) to transmit a pressure signal, to form

DESCRIPTION closed-loop automatic control and avoid a risk of grouting overpressure. The present invention may be disassembled into several modules to be moved to mine respectively, and can be assembled conveniently on site.

[0025] The present invention can not only pump a super viscous medium with a dynamic viscosity up to a million mPa.s, but also convey chemical slurries such as a single fluid slurry, a double fluid slurry, and yellow slurry, and is suitable for grouting and blocking projects that are under high pressures and may cause water inrush, and grouting and solidification projects of loose strata.

[0026] When the present invention is configured as an automatic-variable highpressure oil pump, a pumping flow can be adjusted automatically according to an actual paste discharge pressure at an output end, to implement automatic stepless adjustment of flow and pressure. When the present invention is configured as a manual-variable high-pressure oil pump, constant flow pumping under a stepless change of the actual paste discharge pressure at the output end may be further implemented, to satisfy specific requirements of different working situations. The pumping apparatus uses the specially designed forcedly switched suction and exhaust valves, the upper and lower valve seats and the movable valve block 20 are made of high hardness materials, and can be driven by high-pressure oil to easily crush micro particles in the medium, and a fitting surface is ground finely to meet mirror contact, to avoid internal leakage, cause less paste deposition, and perform long distance transportation.

[0027] The foregoing descriptions are merely preferred embodiments of the present invention, but are not intended to limit the present invention in any form. Any simple modification and equivalent replacement made to the foregoing embodiment according to the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

What is claimed is:

1. A conveying pump apparatus for immobile high viscosity paste, comprising an motor, an oil pump, a hydraulic cylinder, material cylinders, an oil tank, a reversing valve, and a suction and exhaust valve group, wherein the motor is connected to and drives the oil pump, the oil pump conveys high-pressure oil in the oil tank to the hydraulic cylinder through the reversing valve, the hydraulic cylinder drives the suction and exhaust valve group to pump paste in the material cylinders, and return oil in the hydraulic cylinder flows into the oil tank through the reversing valve again, wherein the suction and exhaust valve group comprises two forcedly switched suction and exhaust valves each connected through a tee, a port at a lower end of each of the tees is a valve group material suction port, each of the forcedly switched suction and exhaust valves comprises two strong controllable valves connected through a U-shaped pipe; each of the strong controllable valves comprises a drive oil cylinder, a support sleeve, an upper valve body member, a lower valve body member, an upper valve seat, a lower valve seat, a movable valve block, and a valve rod that are connected hermetically, the drive oil cylinder is connected to a flange I and a flange II at two ends through bolts; the upper valve body member is welded to a flange III; the upper valve body member and the lower valve body member are connected to the flange II through a bolt sheathed with the support sleeve; the valve rod sequentially passes through the upper valve seat, the upper valve body member, and the flange II from the lower valve body member from bottom to top, the upper valve seat and the lower valve seat are located in an inner cavity of the lower valve body member, and are respectively fixed on the flange III and the lower valve body member, the movable valve block is connected to a lower end of the valve rod through a thread and located between the upper valve seat and the lower valve seat, and an upper end of the valve rod is fixed on a drive oil cylinder piston; an upper oil port and a lower oil port are respectively disposed on the drive oil cylinder, and the upper oil port and the lower oil port are respectively in communication with an oil cavity above the drive oil cylinder piston and an oil cavity under the drive oil cylinder piston, the lower valve body member has a material cylinder interface and a lower end port that are in communication with one of the material cylinders; a U-shaped pipe interface extends out from a side portion of the upper valve body member, a lower __________CLAIMS________ end of the U-shaped pipe interface is in communication with the inner cavity of the lower valve body member, the two strong controllable valves are in communication with each other through the U-shaped pipe interface, and the lower end ports of the two strong controllable valves are in communication with the valve group material suction port, to form one of the forced switching suction and exhaust valves; a material discharge interface at one side of each of the two upper valve body members is connected to the tee through the U-shaped pipe, and the U-shaped pipe between the Ushaped pipe interfaces of each of the two forcedly switched suction and exhaust valves is connected through the tee, to form the suction and exhaust valve group as a whole;

the hydraulic cylinder located in a middle portion is connected to the two material cylinders at two ends, to form a hydraulic cylinder material cylinder assembly, a hydraulic cylinder piston and two material cylinder plungers are connected through a plunger rod, cavities at two sides of the hydraulic cylinder piston are connected to a two-position five-way valve through a hydraulic cylinder oil inlet port and a hydraulic cylinder oil outlet port;

the two-position five-way valve is further comprised, the two-position five-way valve comprises a valve body, an upper oil passage and a lower oil passage located in the valve body are disposed in parallel and are not in communication with each other, an oil inlet hole of the upper oil passage and an oil backflow hole of the lower oil passage are in opposite directions and are respectively located at two sides of the valve body, the upper oil passage and the lower oil passage respectively have five side oil holes that are disposed alternately, and furthermore, the side oil holes of the upper oil passage and the side oil holes of the lower oil passage are also arranged alternately; and the oil inlet hole of the upper oil passage of the two-position five-way valve is in communication with an oil outlet port of the reversing valve, the five side oil holes of the upper oil passage are respectively in communication with the hydraulic cylinder oil inlet port, upper oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and lower oil ports of the drive oil cylinders of the left strong controllable valves of the two forced switching suction and exhaust vales of the suction and exhaust vale group; the oil backflow hole of the lower oil passage of the two-position five-way valve is in communication with an oil backflow port of the reversing valve, and the five side oil

CLAIMS holes of the lower oil passage are respectively in communication with the hydraulic cylinder oil outlet port, lower oil ports of the drive oil cylinders of the right strong controllable valves of two forced switching suction and exhaust vales of the suction and exhaust vale group and upper oil ports of the drive oil cylinders of the left strong controllable valves of the two forced switching suction and exhaust vales of the suction and exhaust vale group.
2. The conveying pump apparatus for immobile high viscosity paste according to claim 1, further comprising an energy accumulator and a cooler, wherein the energy accumulator is installed between an oil outlet port of the oil pump and an oil inlet port of the reversing valve, the reversing valve is installed between the energy accumulator and the two-position five-way valve, the cooler is installed between the oil backflow port of the reversing valve and the oil tank, the two-position five-way valve is installed among the hydraulic cylinder, the drive oil cylinders of the suction and exhaust valve group, and the reversing valve .
3. The conveying pump apparatus for immobile high viscosity paste according to claim 1 or 2, wherein the two-position five-way valve further comprises a one-way throttle valve and an oil port joint, and the one-way throttle valve is installed between the side oil holes of the valve body and the oil port joint.
4. The conveying pump apparatus for immobile high viscosity paste according to any one of the preceding claims, wherein the upper valve body member comprises a sealing member, an upper valve body, and a sealing gland, wherein the upper valve body is formed by welding a sealing body, an elbow element, and a joint on the flange III, the sealing body is disposed on an upper portion of the elbow element and a center of the sealing body is coaxial with a center line of the flange III, the joint is disposed on a small end of the elbow element and a center line of the joint is perpendicular to the center line of the flange III, and the sealing member is installed in the sealing body, and pressed tightly by the sealing gland.
5. The conveying pump apparatus for immobile high viscosity paste according to any one of the preceding claims, wherein the hydraulic cylinder piston is sealed with a cylinder body, a piston rod of the hydraulic cylinder is sealed with a hydraulic flange for connecting to each of the material cylinders, each of the material cylinder plungers is sealed with a cylinder body and a material cylinder flange for connecting to the

CLAIMS hydraulic cylinder, the drive oil cylinder piston of each of the strong controllable valves is sealed with a cylinder, the flange I and the flange II are sealed with a cylinder body of the drive oil cylinder, the flange II is sealed with the valve rod, and the upper valve body member is sealed with the valve rod.