Shield slurry conveying and mixing device

Abstract

The utility model provides a shield slurry conveying and mixing device which comprises a pump, a first liquid inlet pipe is arranged at one end of the pump, a mixing pipe is arranged at the other end of the pump, a plurality of necks and stirring cavities which are alternately arranged are arranged in the mixing pipe, a second liquid inlet pipe and a stirring shaft are arranged in the stirring cavities, and a spray head is arranged at the end of the second liquid inlet pipe. The orientation of the nozzle is opposite to the flowing direction of liquid in the mixing pipe. By means of pumping and opposite impact mechanisms and in combination with the stirring shaft and the spiral blades, aggregates in the slurry can be effectively broken, and the mixing uniformity of the curing agent and the slurry is improved. Due to the design of the necking and the stirring cavity, acceleration and deceleration of the fluid are promoted, and the collision opportunity between the fluid is increased, so that the mixing efficiency is enhanced. Due to the use of the reverse spiral blades, bidirectional mixing of the fluid is further enhanced, and mixing dead angles are reduced.

Description

Technical Field

[0001] The utility model relates to the field of shield mud mixing, in particular to a shield mud conveying and mixing device. Background Art

[0002] The shield mud produced by shield construction can be solidified and used as roadbed and foundation pit backfill material. However, due to the high water content and rich clay content of the mud, it often clumps when mixed with cement and other gelling materials, resulting in uneven mixing of the solidified soil and frequent construction problems such as bulging and cracking during filling construction. Utility Model Content

[0003] The main purpose of the utility model is to provide a shield mud conveying and mixing device to solve the problems in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: it includes a pump, a first liquid inlet pipe is provided at one end of the pump, a mixing tube is provided at the other end, a plurality of alternately arranged neckings and stirring chambers are provided in the mixing tube, a second liquid inlet pipe and a stirring shaft are provided in the stirring chamber, and a nozzle is provided at the end of the second liquid inlet pipe, and the direction of the nozzle is opposite to the flow direction of the liquid in the mixing tube.

[0005] Preferably, flanges are fixedly provided at both ends of the mixing tube, and the flanges are fixedly connected to the outlet end of the pump by bolts.

[0006] Preferably, the nozzle is coaxial with the mixing tube.

[0007] Preferably, both ends of the stirring shaft are supported on the mixing tube for rotation via bearing seats, and a motor is provided at one end of the stirring shaft, which is connected to the stirring shaft via a reducer.

[0008] Preferably, a spiral blade is fixedly provided on the stirring shaft.

[0009] Preferably, there are two spiral blades, and the thread directions of the two spiral blades are opposite.

[0010] The utility model provides a shield mud conveying and mixing device, which has the following beneficial effects:

[0011] 1. Through the pumping and impact collision mechanism, combined with the use of stirring shaft and spiral blades, the agglomerates in the mud can be effectively broken and the mixing uniformity of the curing agent and the mud can be improved.

[0012] 2. The design of the constriction and stirring chamber promotes the acceleration and deceleration of the fluid, increases the chance of collision between fluids, and thus enhances the mixing efficiency. The use of reverse spiral blades further enhances the two-way mixing of the fluid and reduces the mixing dead angle.

[0013] 3. The coaxial nozzle design ensures accurate injection of additives, reduces turbulence, and improves system stability and reliability. The use of flanges and bearing seats provides a stable connection and support to ensure the smooth operation and sealing of the equipment.

[0014] 4. Through optimized design, such as using reverse spiral blades and controlling shear force, it is possible to maintain efficient mixing while reducing energy consumption, reduce material blockage and wear, extend equipment life, and reduce maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0016] Figure 1 It is a front view of the overall structure of the utility model;

[0017] Figure 2 It is a front cross-sectional view of the mixing tube of the utility model;

[0018] In the figure: pump 1; first liquid inlet pipe 2; mixing pipe 3; flange 301; necking 302; stirring chamber 303; motor 4; bearing seat 5; second liquid inlet pipe 6; nozzle 601; stirring shaft 7; spiral blade 701. DETAILED DESCRIPTION

[0019] like Figure 1~2 As shown, a shield mud conveying and mixing device comprises a pump 1, wherein a first liquid inlet pipe 2 is provided at one end of the pump 1, and a mixing tube 3 is provided at the other end. The mixing tube 3 is provided with a plurality of alternately arranged constrictions 302 and stirring chambers 303, and the stirring chamber 303 is provided with a second liquid inlet pipe 6 and a stirring shaft 7. A nozzle 601 is provided at the end of the second liquid inlet pipe 6, and the direction of the nozzle 601 is opposite to the liquid flow direction in the mixing tube 3. The shield mud and cement slurry are respectively introduced into the mixing tube 3 from the first liquid inlet pipe 2 and the second liquid inlet pipe 6 by pumping, and the mud and cement slurry introduced from the first liquid inlet pipe 2 and the second liquid inlet pipe 6 collide in the mixing tube 3 so as to achieve mixing, and the stirring shaft 7 is further used to ensure sufficient mixing.

[0020] The pump 1 provides power to suck mud or other fluids from the outside and push them into the mixing pipe 3 .

[0021] The first liquid inlet pipe 2 is used to connect the pump 1 and the storage tank for conveying mud.

[0022] The interior of the mixing tube 3 is designed with alternating constrictions 302 and stirring chambers 303. Based on the Venturi principle, the constrictions 302 can increase the flow rate, while the stirring chamber 303 provides space for the fluid to slow down and mix.

[0023] The constriction 302 increases the mud flow rate by reducing the cross-sectional area of ​​the pipe, which helps to improve the collision strength between fluids and promote mixing.

[0024] The second liquid inlet pipe 6 is used to introduce cement slurry, which is sprayed through the nozzle 601 to collide with the main mud flow.

[0025] The nozzle 601 is opposite to the flow direction of the mud, ensuring that the two fluids collide in the mixing tube 3, thereby increasing the mixing efficiency.

[0026] The stirring shaft 7 is installed in the stirring chamber 303 to further stir the fluid and ensure that the mud and cement slurry are evenly mixed.

[0027] Preferably, flanges 301 are fixedly provided at both ends of the mixing tube 3, and the flanges 301 are fixedly connected to the outlet end of the pump 1 by bolts. The flanges 301 at both ends of the mixing tube 3 are used to connect the pump 1 and the delivery pipeline respectively, and the installation is firm and reliable.

[0028] The connection between the flange and the pump 1 and the delivery pipeline can be easily completed by tightening bolts, which makes maintenance or replacement of parts more convenient and quick.

[0029] The flange is usually equipped with a sealing gasket. When the bolts are tightened, the gasket is compressed to form an effective sealing surface to prevent mud leakage and ensure the safe operation of the system.

[0030] Preferably, the nozzle 601 is coaxial with the mixing tube 3. When the nozzle 601 is coaxial with the mixing tube 3, the center of the mud flow can be accurately sprayed to ensure that the two collide in the shortest distance, thereby improving the mixing efficiency. The nozzle and the mixing tube are coaxial to reduce the turbulence generated when the fluid enters, which helps to maintain a stable flow state and is beneficial to the subsequent mixing process.

[0031] Preferably, both ends of the stirring shaft 7 are supported on the mixing tube 3 for rotation via bearing seats 5 , and a motor 4 is provided at one end of the stirring shaft 7 , which is connected to the stirring shaft 7 via a reducer.

[0032] The motor 4 provides a power source for the stirring shaft 7. According to the mixing requirements, the motor can be of AC or DC type, and the power depends on the size of the mixing tube and the mud characteristics.

[0033] The reducer is connected between the motor 4 and the stirring shaft 7, and is used to reduce the high-speed output speed of the motor to the lower speed required by the stirring shaft, while increasing the torque to ensure that the stirring shaft can operate stably under high load conditions.

[0034] The bearing seat 5 is used to support both ends of the stirring shaft 7 to ensure that it rotates stably without deviation in the mixing tube 3. The bearing seat is equipped with a bearing to reduce friction during rotation, improve efficiency and extend service life.

[0035] The stirring shaft 7 is located inside the mixing tube 3. Its shape and blade design are customized according to the mixing requirements. It can be a propeller type, a turbine type or a paddle type, etc., to promote uniform mixing of the mud and the additive.

[0036] Preferably, a spiral blade 701 is fixedly provided on the stirring shaft 7. There are two spiral blades 701, and the threads of the two spiral blades 701 are opposite. The two spiral blades 701 drive the mud at both ends to converge to the center, promote mixing, and can enter the next constriction 302, avoiding the accumulation of materials in the corners of the stirring chamber 303.

[0037] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A shield mud conveying and mixing device, characterized in that: The pump (1) comprises a first liquid inlet pipe (2) at one end of the pump (1) and a mixing pipe (3) at the other end. The mixing pipe (3) is provided with a plurality of alternately arranged neckings (302) and stirring chambers (303). The stirring chamber (303) is provided with a second liquid inlet pipe (6) and a stirring shaft (7). A nozzle (601) is provided at the end of the second liquid inlet pipe (6). The nozzle (601) is oriented opposite to the direction of liquid flow in the mixing pipe (3).

2. A shield mud conveying and mixing device according to claim 1, characterized in that: Flanges (301) are fixedly provided at both ends of the mixing pipe (3), and the flanges (301) are fixedly connected to the outlet end of the pump (1) by bolts.

3. The shield mud conveying and mixing device according to claim 1 is characterized in that: The nozzle (601) and the mixing tube (3) are coaxial.

4. The shield mud conveying and mixing device according to claim 1 is characterized in that: Both ends of the stirring shaft (7) are supported on the mixing tube (3) through bearing seats (5) for rotation. A motor (4) is provided at one end of the stirring shaft (7), and the motor (4) is connected to the stirring shaft (7) through a reducer.

5. A shield mud conveying and mixing device according to claim 4, characterized in that: A spiral blade (701) is fixedly provided on the stirring shaft (7).

6. A shield mud conveying and mixing device according to claim 5, characterized in that: There are two spiral blades (701), and the thread rotation directions of the two spiral blades (701) are opposite.

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