A sand mixing system

Abstract

This invention discloses a sand mixing system, comprising: a pressure-resistant sand mixing tank; a nozzle; a high-pressure pump, the outlet of which branches to two branches, a first pipe and a second pipe. The end of the first pipe furthest from the high-pressure pump is connected to the pressure-resistant sand mixing tank, and a third pipe is provided at the bottom of the pressure-resistant sand mixing tank. One end of the third pipe is connected to the pressure-resistant sand mixing tank, and the other end merges with the end of the second pipe furthest from the high-pressure pump; a main pipe, the second and third pipes merging and connecting to one end of the main pipe, and the other end of the main pipe connecting to the nozzle; a first flow meter installed on the first pipe, configured to detect the flow rate of the fluid in the first pipe; a second flow meter installed on the main pipe; a flow control valve installed on the first pipe; and a controller communicatively connected to the first flow meter, the second flow meter, and the flow control valve. The sand mixing system provided by this application can achieve automatic adjustment of the abrasive ratio, maintaining the abrasive ratio at a relatively constant state.

Description

Technical Field

[0001] The invention relates to the technical field of abrasive jet cutting, in particular to a sand mixing system. Background Art

[0002] With the development of large-scale, intelligent and specialized equipment, abrasive water jet technology has penetrated into various application fields: industrial cleaning, rust removal and layer removal, hydraulic cutting, engineering crushing, jet grouting, drilling and mining, etc. In the field of hydraulic cutting, abrasive water jet cutting technology is mainly used in the following fields: automobile manufacturing and repair industry, such as cutting various non-metallic materials and composite materials; forestry, agriculture and municipal engineering, such as logging, barking, irrigation, feed processing, road maintenance, cutting and cutting of handicrafts, etc. The prior art discloses a method for filling a pressure vessel and a device for generating a suspension jet. The patent document can also achieve the purpose of adding sand by the gravity of sand, but the system it provides cannot achieve the function of automatic adjustment of the abrasive ratio. As the system runs, the sand content in the sand mixing tank decreases, and the abrasive ratio content in the final jet will decrease.

[0003] Therefore, it is desirable to find a sand mixing system that can achieve a stable abrasive ratio. Summary of the invention

[0004] The invention discloses a sand mixing system and an operating method thereof, so as to solve the defect that a suspension jet device in the prior art cannot realize automatic adjustment of abrasive ratio.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] According to an embodiment of the present application, a sand mixing system is provided, comprising: a pressure-resistant sand mixing tank;

[0007] A nozzle; a high-pressure pump, the outlet of the high-pressure pump is divided into two branches, a first pipeline and a second pipeline, the end of the first pipeline away from the high-pressure pump is connected to the pressure-resistant sand mixing tank, and a third pipeline is provided at the bottom of the pressure-resistant sand mixing tank, one end of the third pipeline is connected to the pressure-resistant sand mixing tank, and the other end intersects with the end of the second pipeline away from the high-pressure pump; a main pipe, the second pipeline and the third pipeline are connected to one end of the main pipe after intersection, and the other end of the main pipe is connected to the nozzle; a first flow meter, which is arranged on the first pipeline and configured to detect the flow rate of the fluid in the first pipeline; a second flow meter, which is arranged on the main pipe; a flow control valve, which is arranged on the first pipeline; and a controller, which is respectively connected to the first flow meter, the second flow meter and the flow control valve.

[0008] Optionally, the second pipeline is arranged below the pressure-resistant sand mixing tank; and one end of the first pipeline away from the high-pressure pump extends from the upper part of the pressure-resistant sand mixing tank into the pressure-resistant sand mixing tank.

[0009] Optionally, a first valve is provided on the first pipeline, a second valve is provided on the main pipe, and a third valve is provided on the third pipeline.

[0010] Optionally, the controller is communicatively connected to the high-pressure pump, the first valve, the second valve and the third valve respectively.

[0011] Optionally, the sand mixing system further includes a sand storage tank, a fourth pipeline and a fifth pipeline, the pressure-resistant sand mixing tank is connected to the sand storage tank through the fourth pipeline and the fifth pipeline at the same time, the fourth pipeline is provided with a first pump for pumping the liquid in the sand mixing tank into the sand storage tank, and the connection state between the pressure-resistant sand mixing tank and the sand storage tank can be opened or closed.

[0012] Preferably, the first pump is a pneumatic diaphragm pump.

[0013] Optionally, a fourth valve is provided on the fourth pipeline, and a fifth valve is provided on the fifth pipeline.

[0014] Optionally, the controller is communicatively connected to the fourth valve, the fifth valve and the first pump respectively.

[0015] Optionally, the sand mixing system further comprises a sand source tank, and the sand source tank is connected to the sand storage tank.

[0016] Optionally, the sand mixing system further includes a second pump, which is used to pump the sand in the sand source tank into the sand storage tank, and the sand source tank is connected to the sand storage tank through the second pump; the controller is communicatively connected to the second pump.

[0017] Preferably, the second pump is a pneumatic diaphragm pump.

[0018] Optionally, the fifth pipe extends to the bottom of the pressure-resistant sand mixing tank.

[0019] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0020] The sand mixing system provided in the present application can realize automatic adjustment of the abrasive ratio, and always keep the abrasive ratio in a relatively constant state. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 Schematic diagram of a sand mixing system according to an embodiment of the present application.

[0023] Description of reference numerals:

[0024] 1First pipeline

[0025] 2 Second pipeline

[0026] 3Third pipeline

[0027] 4The fourth channel

[0028] 5 The Fifth Pipe

[0029] 6. Pressure-resistant sand mixing tank

[0030] 7 Nozzles

[0031] 8. First Pump

[0032] 9Sand storage tank

[0033] 10First Valve

[0034] 11Flow control valve

[0035] 12 First flow meter

[0036] 13 High pressure pump

[0037] 14 Water tank

[0038] 15 Fifth Valve

[0039] 16Fourth valve

[0040] 17Third valve

[0041] 18 Second flow meter

[0042] 19 Second valve

[0043] 20 Second Pump

[0044] 21 Second one-way valve

[0045] 22 Sand source tank

[0046] 23. General Manager

[0047] 24 Relief valve

[0048] 25First check valve DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] The technical solutions disclosed in various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0051] According to one embodiment of the present application, a sand mixing system is provided, comprising: a pressure-resistant sand mixing tank 6; a nozzle 7; a high-pressure pump 13, the outlet of the high-pressure pump 13 is divided into two branches, a first pipeline 1 and a second pipeline 2, the end of the first pipeline 1 away from the high-pressure pump 13 is connected to the pressure-resistant sand mixing tank 6, and a third pipeline 3 is arranged at the bottom of the pressure-resistant sand mixing tank 6, one end of the third pipeline 3 is connected to the pressure-resistant sand mixing tank 6, and the other end is connected to the end of the second pipeline 2 away from the high-pressure pump 13; a main pipe 23, the second pipeline 2 and the third pipeline 3 are connected to one end of the main pipe 23 after the intersection, and the other end of the main pipe 23 is connected to the nozzle 7; a first flow meter 12 is arranged on the first pipeline 1, and is configured to detect the flow rate of the fluid in the first pipeline 1; a second flow meter 18 is arranged on the main pipe 23 to detect the flow rate of the fluid in the main pipe 23; a flow control valve 11 is arranged on the first pipeline 1; a controller (not shown) is respectively connected to the first flow meter 12, the second flow meter 18 and the flow control valve 11.

[0052] Specifically, the flow control valve 11 may be a pneumatic metering valve, and the inlet of the high-pressure pump 13 may be further connected to the water tank 14 to pump the water in the water tank 14 to the first pipeline 1 and the second pipeline 2 .

[0053] Furthermore, the second pipeline 2 may be disposed below the pressure-resistant sand mixing tank 6 ; and one end of the first pipeline 1 away from the high-pressure pump 13 extends from the upper portion of the pressure-resistant sand mixing tank 6 into the pressure-resistant sand mixing tank 6 .

[0054] In order to control the state of the fluid passage in the pipeline, a first valve 10 may be provided on the first pipeline 1, a second valve 19 may be provided on the main pipe 23, and a third valve 17 may be provided on the third pipeline 3. For example, in the embodiment of the present application, the first valve 10 may be a pneumatic needle valve, a pneumatic ball valve, a gate valve, etc., the second valve 19 may be a pneumatic ball valve, and the third valve may be a pneumatic ball valve. It should be understood by those skilled in the art that other valves that can withstand the working environment of the sand mixing system in the embodiment and can control the on-off state of the pipeline may also be used, and they are not listed one by one here.

[0055] The first pipeline 1 may be provided with a first one-way valve 25 to control the flow direction of the fluid and prevent the fluid from flowing back, and in the flow direction of the fluid, the first valve 10 and the flow control valve 11 may be provided after the first one-way valve 25. The second pipeline 2 may be provided with a second one-way valve 21 to control the flow direction of the fluid and prevent the fluid from flowing back.

[0056] In the embodiment of the present application, in order to realize automatic control of the sand mixing system, the controller is respectively communicated with the high-pressure pump 13, the first valve 10, the second valve 19 and the third valve 17 to control the opening and closing of the high-pressure pump 13 and the on-off state of the first valve 10, the second valve 19 and the third valve 17.

[0057] Furthermore, the sand mixing system also includes a sand storage tank 9, a fourth pipeline 4 and a fifth pipeline 5. The pressure-resistant sand mixing tank 6 is connected to the sand storage tank 9 through the fourth pipeline 4 and the fifth pipeline 5 at the same time. The fourth pipeline 4 is provided with a first pump 8 for pumping the liquid in the sand mixing tank 6 into the sand storage tank 9, and the connection state between the pressure-resistant sand mixing tank 6 and the sand storage tank 9 can be opened or closed.

[0058] Specifically, the first pump 8 may be a pneumatic diaphragm pump. In an embodiment of the present application, the first pipe 1 and the fourth pipe 4 may be combined into one pipe at one end close to the pressure-resistant sand mixing tank 6, and extend into the pressure-resistant sand mixing tank 6 through the pipe; in another embodiment, the first pipe 1 and the fourth pipe 4 may extend into the pressure-resistant sand mixing tank 6 respectively. The pressure-resistant sand mixing tank 6 is sealedly connected to the first pipe 1, the third pipe and the fourth pipe 4, thereby forming a sealed space in the pressure-resistant sand mixing tank 6 and maintaining a certain pressure.

[0059] In the embodiment of the present application, in order to control the connection state between the pressure-resistant sand mixing tank 6 and the sand storage tank 9, a fourth valve 16 may be provided on the fourth pipeline 4, and a fifth valve 15 may be provided on the fifth pipeline 5. For example, in the embodiment of the present application, the fourth valve 16 and the fifth valve 15 may be pneumatic ball valves.

[0060] Further, the controller may be respectively connected to the fourth valve 16 , the fifth valve 15 and the first pump 8 in communication to control the on / off states of the fourth valve 16 and the fifth valve 15 and the opening and closing of the first pump 8 .

[0061] In the embodiment of the present application, the sand mixing system further includes a sand source tank 22, which is connected to the sand storage tank 9. The sand source tank 22 stores sand.

[0062] In order to save manpower and time, the sand mixing system can also include a second pump 20, which is used to pump the sand in the sand source tank 22 into the sand storage tank 9. The sand source tank 22 is connected to the sand storage tank 9 through the second pump 20; the controller is communicated with the second pump 20 to control the opening and closing of the second pump 20.

[0063] The second pump 20 may be a pneumatic diaphragm pump. In addition, a relief valve 24 may be installed at the outlet of the high-pressure pump 13, so that when the pressure at the outlet of the high-pressure pump 13 is too high, the relief valve 24 automatically opens to relieve the pressure of the entire sand mixing system.

[0064] In the embodiment of the present application, the fifth pipeline 5 may extend to the bottom of the pressure-resistant sand mixing tank 6 .

[0065] According to another embodiment of the present application, a sand mixing method of a sand mixing system is provided, comprising the following steps:

[0066] S01: Turn on the second pump 20 to fill a certain amount of sand into the sand storage tank 9;

[0067] S02: Open the first valve 10 and the flow control valve 11 to the maximum, open the fifth valve 15, and close the second valve 19, the third valve 17 and the fourth valve 16.

[0068] S03: Start the high-pressure pump 13, inject the water from the water tank 14 into the pressure-resistant sand mixing tank 6, until water from the pipeline connected to the fifth valve 15 flows into the sand storage tank 9, and then turn off the high-pressure pump 13;

[0069] S04: close the first valve 10 and the flow control valve 11, open the fourth valve 16, and start the first pump 8. The water in the pressure-resistant sand mixing tank 6 will be transported to the sand storage tank 9 by the first pump 8, and negative pressure will appear in the pressure-resistant sand mixing tank 6, so that the mixture of water and sand in the sand storage tank 9 is sucked into the pressure-resistant sand mixing tank 6.

[0070] S05: When the set amount of sand enters the pressure-resistant sand mixing tank 6, the fourth valve 16 and the fifth valve 15 are closed, the second valve 19 and the third valve 17 are opened, the first valve 10 is opened to the maximum opening, and the flow control valve 11 is opened to the set opening L. The high-pressure pump 13 is started until the pressure of the sand mixing system reaches the predetermined working pressure A.

[0071] S06: The first flowmeter 12 and the second flowmeter 18 measure the fluid flow FM1 in the first pipeline 1 and the fluid flow FM2 in the main pipe 23 respectively; the signal values ​​measured by the first flowmeter 12 and the second flowmeter 18 are transmitted to the controller. After being processed by the controller, the signal acts on the flow control valve 11 to realize the opening control of the flow control valve 11. Among them, the first flowmeter 12 is used to measure the flow of the fluid in the first pipeline 1. After the high-pressure pump 13 is turned on, water enters the pressure-resistant sand mixing tank 6 from the first pipeline 1 (bypass), and the internal pressure of the pressure-resistant sand mixing tank 6 is consistent with the internal pressure of the third pipeline 3. When the third valve 17 is opened, sand enters the third pipeline 3 from the bottom of the pressure-resistant sand mixing tank 6 by gravity. The volume of water entering the pressure-resistant sand mixing tank 6 from the first pipeline 1 is the volume of sand-water mixture leaking from the bottom of the pressure-resistant sand mixing tank 6. Among them, the sand content in the sand-water mixture is extremely high. Therefore, the sand and water leaking from the bottom of the sand mixing tank 6 The volume of the mixture is basically equal to the volume of sand in the sand-water mixture. Therefore, the volume of water entering the pressure-resistant sand mixing tank 6 from the first pipe 1 is basically consistent with the volume of sand in the sand-water mixture leaking from the bottom of the sand mixing tank 6. Therefore, the flow rate FM1 of the fluid in the first pipe 1 measured by the first flowmeter 12 is basically equal to the flow rate of sand entering the main pipe 23 from the third pipe 3; and the flow rate FM2 measured by the second flowmeter 18 is the sum of the flow rate of the fluid pumped to the main pipe 23 by the high-pressure pump 13 and the flow rate of sand entering the main pipe 23 from the third pipe 3. Therefore, the abrasive ratio = FM1 / FM2.

[0072] S07: When the controller detects that the FM1 / FM2 ratio is lower than the set value, the opening of the flow control valve 11 is adjusted to increase the opening to increase the flow FM1 of the first pipeline 1, thereby increasing the abrasive ratio; when the FM1 / FM2 ratio is detected to be higher than the set value, the opening of the flow control valve 11 is adjusted to decrease the opening to reduce the flow FM1 of the first pipeline 1, thereby reducing the abrasive ratio. Of course, it should be understood by ordinary technicians in this field that in this embodiment, the set value can be a specific value, and in other embodiments, the set value can also be a set numerical range. At this time, when the controller detects that the FM1 / FM2 ratio is lower than the lower limit of the set numerical range, the opening of the flow control valve 11 is adjusted to increase the opening to increase the flow FM1 of the first pipeline 1, thereby increasing the abrasive ratio; when the FM1 / FM2 ratio is detected to be higher than the upper limit of the set numerical range, the opening of the flow control valve 11 is adjusted to decrease the opening to reduce the flow FM1 of the first pipeline 1, thereby reducing the abrasive ratio. In conclusion, through the above control, the abrasive ratio can be automatically controlled at a certain set value or within a certain set value range.

[0073] S08: In this embodiment, the total volume of the fluid flowing through the first pipeline 1 within a certain period of time can also be monitored. For example, as an implementation, the total volume of the fluid flowing through the first pipeline 1 within a certain period of time can be calculated based on the flow rate of the fluid in the first pipeline 1 detected in real time by the first flowmeter 12 and the time that has passed. As another implementation, the flow rate of the fluid in the first pipeline 1 and the total volume of the fluid flowing through the first pipeline 1 within a certain period of time can be detected in real time by the first flowmeter 12 at the same time. Afterwards, the monitored total volume signal of the fluid flowing through the first pipeline 1 is transmitted to the controller, and after being compared with the preset value, the signal acts on the first pump 8 to realize the control of the switch of the first pump 8. The preset value (usually an empirical value) is equal to the total volume of sand (excluding water) in the sand-water mixture in the pressure-resistant sand mixing tank 6. The specific implementation is as follows: when the total volume of the fluid flowing through the first pipeline 1 monitored is less than the set value, it means that there is still sand in the pressure-resistant sand mixing tank 6, and the first pump 8 will not start; when the total volume of the fluid flowing through the first pipeline 1 monitored by the first flowmeter 12 is greater than the set value, it means that the pressure-resistant sand mixing tank 6 is basically water, and contains no or very little sand. The sand mixing system, under the action of the controller, executes the above steps S01-S06 in sequence, thereby realizing automatic sand addition.

[0074] The sand mixing system provided by the present application can realize automatic adjustment of the abrasive ratio, and always keep the abrasive ratio in a relatively constant state; the entire sand mixing system is automated, and there is no need to replace the storage device, thereby saving manpower and time, and being more convenient and efficient. In addition, the entire sand mixing system is operated in a high-pressure state during the entire operation process, and personnel do not need to approach the equipment, which is safer.

[0075] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0076] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A sand mixing system, characterized in that: include: Pressure-resistant sand mixing tank; nozzle; A high-pressure pump, wherein the outlet of the high-pressure pump is divided into two branches, a first pipeline and a second pipeline, wherein one end of the first pipeline away from the high-pressure pump is connected to the pressure-resistant sand mixing tank, and a third pipeline is provided at the bottom of the pressure-resistant sand mixing tank, wherein one end of the third pipeline is connected to the pressure-resistant sand mixing tank, and the other end of the third pipeline intersects with one end of the second pipeline away from the high-pressure pump; A main pipe, wherein the second pipe and the third pipe are connected to one end of the main pipe after being intersected, and the other end of the main pipe is connected to the nozzle; a first flow meter, disposed on the first pipeline and configured to detect a flow rate of a fluid in the first pipeline; A second flow meter is arranged on the main pipe; A flow control valve, arranged on the first pipeline; as well as A controller, respectively connected to the first flow meter, the second flow meter and the flow control valve for communication; The sand mixing system also includes a sand storage tank, a fourth pipeline and a fifth pipeline. The pressure-resistant sand mixing tank is connected to the sand storage tank through the fourth pipeline and the fifth pipeline at the same time. The first pipeline and the fourth pipeline are merged into one pipeline at one end close to the pressure-resistant sand mixing tank, and extend into the pressure-resistant sand mixing tank through the pipeline. The fourth pipeline is provided with a first pump for pumping liquid in the sand mixing tank into the sand storage tank, and the connection state between the pressure-resistant sand mixing tank and the sand storage tank can be opened or closed.

2. The sand mixing system according to claim 1, characterized in that: The second pipeline is arranged below the pressure-resistant sand mixing tank; One end of the first pipeline away from the high-pressure pump extends from the upper part of the pressure-resistant sand mixing tank into the pressure-resistant sand mixing tank.

3. The sand mixing system according to claim 1, characterized in that: The first pipeline is provided with a first valve, the main pipeline is provided with a second valve, and the third pipeline is provided with a third valve.

4. The sand mixing system according to claim 3, characterized in that: The controller is communicatively connected with the high-pressure pump, the first valve, the second valve and the third valve respectively.

5. The sand mixing system according to claim 1, characterized in that: The fourth pipeline is provided with a fourth valve, and the fifth pipeline is provided with a fifth valve.

6. The sand mixing system according to claim 5, characterized in that: The controller is communicatively connected with the fourth valve, the fifth valve and the first pump respectively.

7. The sand mixing system according to claim 1, characterized in that: It also includes a sand source tank, which is communicated with the sand storage tank.

8. The sand mixing system according to claim 7, characterized in that: It also includes a second pump, which is used to pump the sand in the sand source tank into the sand storage tank, and the sand source tank is connected to the sand storage tank through the second pump; The controller is in communication with the second pump.

9. The sand mixing system according to claim 1, characterized in that: The fifth pipeline extends to the bottom of the pressure-resistant sand mixing tank.

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