Indoor foaming system for subway shield foam

Abstract

The utility model discloses an indoor foaming system for subway shield foam. The indoor foaming system comprises a glass container, an air compressor, a mixing barrel, a foam generating device and a spray head, the output end of the glass container is connected with the input end of the mixing barrel, and the output end of the mixing barrel is connected with the first input end of the foam generating device; the air compressor is connected with the second input end of the foam generating device; the output end of the foam generating device is connected with the nozzle. The technical problems that in an existing subway shield muck improvement test, the experimental environment is prone to being interfered, needed foam is not easy to obtain, foam is not quantitatively produced, and the foaming efficiency is low are solved, accurate control over the concentration, flow and pressure of foam mixed liquid is achieved, therefore, the proportion of the foam mixed liquid is more flexible, the requirement needed by the experiment is conveniently met, and the experiment efficiency is improved. And the foaming efficiency and the foaming quantity are improved.

Description

Technical Field

[0001] The present application relates to the technical field of subway shield slag improvement, and in particular to an indoor foaming system for subway shield foam. Background Art

[0002] The construction of subway projects accounts for a large proportion of the entire transportation construction. The shield method has become the first choice for many urban subway tunnel construction methods due to its high excavation efficiency, low interference to the surrounding environment, and strong adaptability to the strata. Since shield machines often encounter many engineering hazards such as slag gushing and "mud cakes" during the excavation process, it is necessary to improve the slag. When improving the slag, foaming agents are often used as improvers. The performance of the foaming agent is closely related to the effect of slag improvement. The production and processing process of the foaming agent will affect its performance, and then affect the effect of slag improvement.

[0003] When conducting indoor experiments on slag improvement, foam is an important raw material for indoor experiments on slag improvement. In order to ensure that foam is obtained in time, traditional slag improvement experiments mostly need to be conducted immediately on site, and the on-site experimental environment is often restricted. However, it is difficult to quantitatively control the foaming agent raw materials, foam mixture, compressed air and foam output in existing indoor experiments on slag improvement. At the same time, the existing indoor foaming system for slag improvement has the disadvantages of single foaming form and number, low foaming efficiency, etc. Therefore, it is necessary to continuously optimize the ratio of the foam mixture to make the foaming agent more effective in slag improvement technology. Utility Model Content

[0004] The embodiment of the present application provides an indoor foaming system for subway shield foam, thereby solving the technical problems in the existing subway shield slag improvement test that the experimental environment is easily disturbed, the required foam is difficult to obtain, the foam is not quantitatively produced, and the foaming efficiency is low. It realizes precise control of the concentration, flow rate and pressure of the foam mixture, thereby making the ratio of the foam mixture more flexible, facilitating meeting the requirements of the experiment, and improving the efficiency and quantity of foaming.

[0005] The utility model embodiment provides an indoor foaming system for subway shield foam, comprising a glass container, an air compressor, a mixing barrel, a foam generating device and a nozzle; the output end of the glass container is connected to the input end of the mixing barrel, the output end of the mixing barrel is connected to the first input end of the foam generating device; the air compressor is connected to the second input end of the foam generating device; the output end of the foam generating device is connected to the nozzle.

[0006] In a possible implementation, it further includes a first pressure gauge, a first adjustable flow meter and a first one-way valve; the first pressure gauge, the first adjustable flow meter and the first one-way valve are sequentially connected between the glass container and the mixing barrel.

[0007] In a possible implementation, a first direct current high-pressure water pump is further included; the first direct current high-pressure water pump is connected between the glass container and the first pressure gauge.

[0008] In a possible implementation, it further includes a second pressure gauge, a second adjustable flow meter and a second one-way valve; the second pressure gauge, the second adjustable flow meter and the second one-way valve are sequentially connected between the mixing barrel and the foam generating device.

[0009] In a possible implementation, a second DC high-pressure water pump is further included; the second DC high-pressure water pump is connected between the mixing barrel and the second pressure gauge.

[0010] In a possible implementation, a third adjustable flow meter and a third one-way valve are further included; the third adjustable flow meter and the third one-way valve are sequentially connected between the air compressor and the foam generating device.

[0011] In a possible implementation, a third DC high-pressure water pump is further included; the third DC high-pressure water pump is connected between the air compressor and the third adjustable flow meter.

[0012] In a possible implementation, a third pressure gauge and a fourth adjustable flow meter are further included; the third pressure gauge and the fourth adjustable flow meter are sequentially connected between the nozzle and the foam generating device.

[0013] In a possible implementation, scale lines are provided on both the mixing barrel and the glass container.

[0014] In a possible implementation, a filter screen is disposed inside the foam generating device, and the filter screen is configured to control the size of the foam.

[0015] One or more technical solutions provided by this application have at least the following technical effects:

[0016] The embodiment of the utility model adopts an indoor foaming system for subway shield foam, including a glass container, an air compressor, a mixing barrel, a foam generating device and a nozzle; the output end of the glass container is connected to the input end of the mixing barrel, foaming agent raw materials and water are input into the glass container, and the foaming agent raw materials and water are mixed in the mixing barrel; the output end of the mixing barrel is connected to the first input end of the foam generating device; the air compressor is connected to the second input end of the foam generating device; the output end of the foam generating device is connected to the nozzle. The air compressor can input compressed air into the foam generating device, and the mixed foaming agent in the mixing barrel and the compressed air output by the air compressor are input into the foam generating device together, and foam is generated in the foam generating device, and the generated foam is output from the nozzle, thereby realizing the improvement of the slag with foam.

[0017] The present application solves the technical problems in existing subway shield slag improvement tests, such as the experimental environment being easily disturbed, the required foam being difficult to obtain, the foam being not quantitatively produced, and the low foaming efficiency, and realizes precise control of the concentration, flow rate, and pressure of the foam mixture, thereby making the ratio of the foam mixture more flexible, facilitating meeting the requirements of the experiment, and improving the efficiency and quantity of foaming. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of an indoor foaming system for subway shield foam provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of a glass container provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of a mixing barrel provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of a foam generating device provided in an embodiment of the present application;

[0023] Figure 5 This is a schematic diagram of a foam generating device provided in an embodiment of the present application.

[0024] Icons: 1-glass container; 2-air compressor; 3-mixing barrel; 4-foam generating device; 41-filter screen; 5-nozzle; 6-first pressure gauge; 7-first adjustable flow meter; 8-first one-way valve; 9-first DC high-pressure water pump; 10-second pressure gauge; 11-second adjustable flow meter; 12-second one-way valve; 13-second DC high-pressure water pump; 14-third adjustable flow meter; 15-third one-way valve; 16-third DC high-pressure water pump; 17-third pressure gauge; 18-fourth adjustable flow meter. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0027] The utility model embodiment provides an indoor foaming system for subway shield foam, such as Figure 1-5 As shown, it includes a glass container 1, an air compressor 2, a mixing barrel 3, a foam generating device 4 and a nozzle 5; the output end of the glass container 1 is connected to the input end of the mixing barrel 3, and the output end of the mixing barrel 3 is connected to the first input end of the foam generating device 4; the air compressor 2 is connected to the second input end of the foam generating device 4; and the output end of the foam generating device 4 is connected to the nozzle 5.

[0028] Exemplarily, it also includes a PVC pipe, the glass container 1 and the mixing barrel 3 are connected by a PVC pipe, the mixing barrel 3 and the foam generating device 4 are connected by a PVC pipe, the air compressor 2 and the foam generating device 4 are connected by a PVC pipe, and the foam generating device 4 and the nozzle 5 are connected by a PVC pipe.

[0029] Exemplarily, the mixing barrel 3 is a mixing container for the foaming agent raw material and water, a joint is provided at the bottom of the glass container 1, the joint is connected to the mixing barrel 3 through a PVC pipe, and the mixing barrel 3 includes a foaming agent raw material inlet and a water inlet; two glass containers 1 are provided, one of the glass containers 1 has an adapter connected to the foaming agent raw material inlet of the mixing barrel 3 through a PVC pipe, and the other glass container 1 has an adapter connected to the water inlet of the mixing barrel 3 through a PVC pipe.

[0030] Exemplarily, the connection port with the mixing barrel 3 in the foam generating device 4 is arranged above the connection port with the air compressor 2, so that the inflowing gas and liquid phases can be fully mixed when they meet, thereby improving the foaming efficiency.

[0031] Exemplarily, the foam generating device 4 is made of steel, and has a size of a rectangular parallelepiped of 50 mm×30 mm×30 mm.

[0032] Exemplarily, the capacity of the glass container 1 is 2000 mL, and the capacity of the mixing barrel 3 is 5000 mL.

[0033] In the present application embodiment, Figure 1-5 As shown, it also includes a first pressure gauge 6, a first adjustable flow meter 7 and a first one-way valve 8; the first pressure gauge 6, the first adjustable flow meter 7 and the first one-way valve 8 are connected between the glass container 1 and the mixing barrel 3 in sequence.

[0034] In the present application embodiment, Figure 1-5 As shown, it also includes a first DC high-pressure water pump 9; the first DC high-pressure water pump 9 is connected between the glass container 1 and the first pressure gauge 6.

[0035] Exemplarily, the first pressure gauge 6, the second pressure gauge 10 and the third pressure gauge 17 of the present application are all precision pressure gauges, whose measurable pressure range is 0MPa-0.44MPa, whose thickness is 60mm, whose dial diameter is 150mm, and the precision pressure gauge can accurately measure the fluid pressure. Specifically, the first pressure gauge 6, the second pressure gauge 10 and the third pressure gauge 17 can accurately measure the fluid pressure in the delivery pipeline, thereby realizing the function of effectively monitoring the pipeline pressure.

[0036] Exemplarily, the volumes of the first DC high-pressure water pump 9, the second DC high-pressure water pump 13 and the third DC high-pressure water pump 16 are all 230 mm×110 mm×100 mm; the first one-way valve 8 is a one-way spherical valve, and the first one-way valve 8, the second one-way valve 12 and the third one-way valve 15 are all composed of components such as a valve body, a steel ball, a spring and a baffle.

[0037] Exemplarily, the first adjustable flowmeter 7, the second adjustable flowmeter 11, the third adjustable flowmeter 14 and the fourth adjustable flowmeter 18 are all rotor flowmeters, which can accurately measure the fluid flow rate. The rotor flowmeter is connected to the motor and powered by a DC voltage. The first adjustable flowmeter 7, the second adjustable flowmeter 11, the third adjustable flowmeter 14 and the fourth adjustable flowmeter 18 can monitor and control the fluid flow rate in the pipeline in real time, thereby achieving effective control of the foam parameters.

[0038] Exemplarily, the glass container 1 includes a glass cup, and two glass containers 1 are provided, wherein one glass container 1 contains a foaming agent raw material, and the other glass container 1 contains an aqueous solution, and both glass containers 1 can be connected to a mixing barrel 3, and a first direct current high-pressure water pump 9, a first pressure gauge 6, a first adjustable flow meter 7, and a first one-way valve 8 are sequentially connected between each glass container 1 and the mixing barrel 3. Among them, the first direct current high-pressure water pump 9 can be used as a power system for the foaming agent raw material and water, respectively, so that the foaming agent raw material in one glass container 1 and the aqueous solution in the other glass container 1 can be delivered to the mixing barrel 3 at a pressure of 0.1MPa-0.2MPa; the two first adjustable flow meters 7 can respectively monitor the flow of the foaming agent raw material and water in real time. The mixing barrel 3 can be used to mix two liquids and can also measure the volume of the mixed solution. The two first one-way valves 8 can respectively make the outflowing foaming agent raw material and aqueous solution flow along the outlet direction of the first one-way valve 8, thereby preventing the liquid from flowing back.

[0039] In the present application embodiment, Figure 1-5 As shown, it also includes a second pressure gauge 10, a second adjustable flow meter 11 and a second one-way valve 12; the second pressure gauge 10, the second adjustable flow meter 11 and the second one-way valve 12 are connected between the mixing barrel 3 and the foam generating device 4 in sequence.

[0040] In the present application embodiment, Figure 1-5 As shown, a second DC high-pressure water pump 13 is also included; the second DC high-pressure water pump 13 is connected between the mixing barrel 3 and the second pressure gauge 10.

[0041] Exemplarily, the second direct current high-pressure water pump 13 can deliver the foam mixed solution to the foam generating device 4 at a pressure of 0.1 MPa-0.2 MPa.

[0042] In the present application embodiment, Figure 1-5 As shown, it also includes a third adjustable flow meter 14 and a third one-way valve 15; the third adjustable flow meter 14 and the third one-way valve 15 are connected between the air compressor 2 and the foam generating device 4 in sequence.

[0043] In the present application embodiment, Figure 1-5 As shown, a third DC high-pressure water pump 16 is also included; the third DC high-pressure water pump 16 is connected between the air compressor 2 and the third adjustable flow meter 14.

[0044] Exemplarily, the air compression system is composed of an air compressor 2 , a third high-pressure water pump 16 , a third adjustable flow meter 14 and a third one-way valve 15 , and the output end of the air compression system is connected to the compressed air inlet of the foam generating device 4 .

[0045] For example, in the air compression system, compressed gas can be made to flow to the foam generating device 4, wherein the third one-way valve 15 can prevent the gas from flowing back, thereby ensuring the accuracy of the fluid parameters in the entire system.

[0046] In the present application embodiment, Figure 1-5 As shown, it also includes a third pressure gauge 17 and a fourth adjustable flow meter 18; the third pressure gauge 17 and the fourth adjustable flow meter 18 are connected between the nozzle 5 and the foam generating device 4 in sequence.

[0047] In the present application embodiment, Figure 1-5 As shown, both the mixing barrel 3 and the glass container 1 are provided with scale lines.

[0048] Exemplarily, two glass containers 1 are provided, and scale lines are provided on both glass containers 1 .

[0049] In the present application embodiment, Figure 1-5 As shown, a filter screen 41 is disposed inside the foam generating device 4, and the filter screen 41 is configured to control the size of the foam.

[0050] Exemplarily, the material of the filter screen 41 includes stainless steel, and the foam generating device 4 is mainly composed of a 10 mm thick housing, a stainless steel filter screen 41 and a stainless steel partition. The foam mixed liquid in the mixing barrel 3 is output to the foam generating device 4 through a PVC pipe, wherein the filter hole diameter of the filter screen 41 is 0.5 mm, and the filter screen 41 can be disassembled and replaced.

[0051] Exemplarily, the mixing barrel 3 can quantitatively deliver the foam mixed solution to the foam generating device 4. At the same time, a quantitative amount of compressed air is simultaneously delivered to the foam generating device 4 by the air compressor 2. The gas-liquid two-phase is first punched and then mixed at a pressure of 0.2 MPa in the mixing chamber of the foam generating device 4. Then, it is fully contacted with the filter screen 41 under pressure delivery and generates foam. The foam flows to the contraction section next to the foam outlet. In the contraction section, the flow rate of the foam is accelerated due to the squeezing effect, thereby splitting, and the number of foams increases accordingly. Designers can control the size of the foam by replacing the filter screen 41 with filter screen holes of different diameters, so as to achieve the purpose of achieving the foam parameters required for indoor experiments. The contraction section is set at the outlet position of the foam generating device 4, which not only accelerates the flow of the two-phase bubbles, but also makes the bubbles expand under the action of pressure, so that the bubbles after the filter screen 41 are unstable and ruptured to produce smaller bubbles, thereby increasing the number of foams.

[0052] The utility model embodiment provides an indoor foaming system for subway shield foam, and the operation steps are as follows:

[0053] The first step: first close the first adjustable flow meter 7, determine the volumes of the foaming agent raw material and water according to the designed concentration, and add the foaming agent raw material and water into the two glass containers 1 respectively.

[0054] Step 2: Turn on the first adjustable flow meter 7 and the first DC high-pressure water pump 9, and at the same time, adjust the first pressure gauge 6 to about 0.2 MPa, so that a certain amount of foaming agent raw material and aqueous solution are respectively output from the two glass containers 1 and enter the mixing barrel 3 along the PVC pipe to form a foam mixed solution.

[0055] Step 3: turn off the fourth adjustable flow meter 18, adjust the third pressure gauge 17 to about 0.2 MPa, and then turn on the air compressor 2 to allow the compressed air to be introduced into the foam generating device 4 through the PVC pipe.

[0056] Step 4: Turn on the second adjustable flow meter 11 and the second DC high-pressure water pump 13, and adjust the second pressure gauge 10 to about 0.2 MPa, so that a certain amount of foam mixed solution enters the foam generating device 4 from the mixing barrel 3 along the PVC pipe.

[0057] Step 5: After the foam mixed solution and compressed air form foam in the foam generating device 4, turn on the fourth adjustable flow meter 18 and the third pressure gauge 17, and adjust the foam output flow rate and pressure according to experimental requirements to make the foam spray out from the nozzle 5.

[0058] The present application achieves precise control of parameters such as the concentration, flow rate and pressure of the foam mixture by setting up multiple high-precision pressure gauges and multiple adjustable flow meters in the system and using a glass cup with a scale, making the ratio of the foam mixture more flexible and facilitating meeting the requirements of the experiment.

[0059] The present application can flexibly control the gas compression ratio and gas pressure and other parameters through the high-precision pressure gauge and adjustable flow meter set in the system. At the same time, the stainless steel filter screen 41 is set in the foam generating device 4, which can change the single foaming form into a combination of shear foaming and foaming through porous media, thereby improving the foaming efficiency.

[0060] The foaming system of this application has been repeatedly used in the slag improvement tests of multiple subway projects, providing a good basis for the foaming performance and half-life experiments of the foam, and has a very high cost-effectiveness.

[0061] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0062] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. An indoor foaming system for subway shield foam, characterized in that: It comprises a glass container (1), an air compressor (2), a mixing barrel (3), a foam generating device (4) and a spray head (5); The output end of the glass container (1) is connected to the input end of the mixing barrel (3), and the output end of the mixing barrel (3) is connected to the first input end of the foam generating device (4); The air compressor (2) is connected to a second input end of the foam generating device (4); The output end of the foam generating device (4) is connected to the nozzle (5).

2. The indoor foaming system of subway shield foam according to claim 1 is characterized in that: It also includes a first pressure gauge (6), a first adjustable flow meter (7) and a first one-way valve (8); The first pressure gauge (6), the first adjustable flow meter (7) and the first one-way valve (8) are connected in sequence between the glass container (1) and the mixing barrel (3).

3. The indoor foaming system of subway shield foam according to claim 2 is characterized in that: It also includes a first direct current high-pressure water pump (9); The first direct current high-pressure water pump (9) is connected between the glass container (1) and the first pressure gauge (6).

4. The indoor foaming system of subway shield foam according to claim 1, characterized in that: It also includes a second pressure gauge (10), a second adjustable flow meter (11) and a second one-way valve (12); The second pressure gauge (10), the second adjustable flow meter (11) and the second one-way valve (12) are connected in sequence between the mixing barrel (3) and the foam generating device (4).

5. The indoor foaming system of subway shield foam according to claim 4, characterized in that: Also includes a second direct current high pressure water pump (13); The second direct current high-pressure water pump (13) is connected between the mixing barrel (3) and the second pressure gauge (10).

6. The indoor foaming system of subway shield foam according to claim 1, characterized in that: It also includes a third adjustable flow meter (14) and a third one-way valve (15); The third adjustable flow meter (14) and the third one-way valve (15) are connected in sequence between the air compressor (2) and the foam generating device (4).

7. The indoor foaming system of subway shield foam according to claim 6, characterized in that: Also includes a third DC high-pressure water pump (16); The third direct current high-pressure water pump (16) is connected between the air compressor (2) and the third adjustable flow meter (14).

8. The indoor foaming system of subway shield foam according to claim 1, characterized in that: Also includes a third pressure gauge (17) and a fourth adjustable flow meter (18); The third pressure gauge (17) and the fourth adjustable flow meter (18) are connected in sequence between the spray head (5) and the foam generating device (4).

9. The indoor foaming system of subway shield foam according to claim 1, characterized in that: The mixing barrel (3) and the glass container (1) are both provided with scale marks.

10. The indoor foaming system of subway shield foam according to claim 1, characterized in that: A filter screen (41) is arranged inside the foam generating device (4), and the filter screen (41) is configured to control the size of the foam.

Images