A slurry preparation device for prestressed duct grouting material with measurable fluidity

Abstract

A slurry preparation device for prestressed duct grouting material with measurable fluidity, comprising a mixing barrel, a mixing paddle and a driving mechanism that cooperate with each other. The mixing barrel is of a sealed structure, and the mixing paddle is rotatably installed in the mixing barrel at high speed. The driving mechanism is used to drive the mixing paddle to rotate at high speed and measure the fluidity of the slurry. By designing the mixing barrel as a sealed structure and the mixing paddle to rotate at high speed, the cement particles rotating at high speed continuously impact the barrel wall and shear each other under the action of centrifugal acceleration, so that the material is fully disturbed, evenly mixed and thoroughly dispersed in the mixing barrel, creating sufficient conditions for the full hydration of cement, thereby making the indicators of the prepared grouting material slurry superior to those of the grouting material slurry prepared by the existing slurry preparation machines. It is applicable to the slurry preparation of cement grouting materials.

Description

Technical Field

[0001] The present invention relates to the technical field of cement grouting materials, and specifically to a slurry preparation device for prestressed duct grouting materials with measurable fluidity. Background Art

[0002] At present, most of the existing slurry preparation machines for cement-based prestressed duct grouting materials adopt a vertical stirring structure, and the stirring tank is generally of an open structure. However, since the particles (fine particles) in the cement slurry are mostly suspended in the system in the form of flocs, the greater the concentration, the stronger the tendency of the flocs to exist, and the more difficult it is to disperse the cement particles. In this way, due to the structural reasons of the vertical stirring tank, the slurry will form a regular rotational flow field in the tank with the movement of the paddle blades, and the relative movement around the main shaft is greatly reduced, resulting in the formation of agglomerates (powder-in-water) of some powder materials in the slurry, which are extremely difficult to break and disperse, causing some cement to be difficult to hydrate, and thus seriously affecting the quality of the prepared slurry. Moreover, the existing slurry preparation machines do not have the function of measuring fluidity, so the prepared slurry needs to be measured by a separate fluidity test device, which is very inconvenient to operate and has low efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide a slurry preparation device for prestressed duct grouting materials with measurable fluidity, so as to solve the problems raised in the above background art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A slurry preparation device for prestressed duct grouting materials with measurable fluidity includes a mutually cooperating stirring tank, a stirring paddle and a driving mechanism. The stirring tank is of a sealed structure, the stirring paddle is rotatably installed in the stirring tank at a high speed, and the driving mechanism is used to drive the stirring paddle to rotate at a high speed. By designing the stirring tank as a sealed structure and the stirring paddle as rotating at a high speed, the cement particles rotating at a high speed will continuously impact the tank wall and shear each other under the action of centrifugal acceleration, so that the materials are fully disturbed, mixed evenly and dispersed thoroughly in the stirring tank, creating sufficient conditions for the full hydration of the cement, thereby making the various indexes of the prepared grouting material slurry better than those of the grouting material slurry prepared by the existing slurry preparation machines.

[0006] Preferably, the stirring barrel is of a horizontal structure, and the rotation speed of the stirring paddle is greater than or equal to 400 rpm. By designing the stirring barrel as a horizontal structure, as the stirring paddle rotates, a turbulent zone is formed on the back surface of the paddle blade of the stirring paddle. Then, the slurry will exhibit irregular flow and mutual impact in the stirring barrel, enabling the rapid dispersion of cement particles and the full hydration of cement molecules. By designing the rotation speed of the stirring paddle to be greater than or equal to 400 rpm and the linear velocity of the paddle blade 2b of the stirring paddle to be greater than or equal to 7 m / s, the high-speed rotating cement particles will continuously impact the barrel wall and shear each other under the action of centrifugal acceleration, causing the material to be fully disturbed, mixed evenly, and dispersed thoroughly in the stirring barrel, creating sufficient conditions for the full hydration of cement. As a result, the slurry of the grouting material prepared has better indicators such as fluidity and bleeding rate than the slurry of the grouting material prepared by the existing pulp-making machine.

[0007] Preferably, the ratio of the rotation diameter of the paddle blade of the stirring paddle to the inner diameter of the stirring barrel is greater than or equal to 0.7 and less than 1, and the ratio of the effective action width of the paddle blade of the stirring paddle to the net length of the stirring barrel is 0.2 - 0.8. When the ratio of the effective action width of the paddle blade of the stirring paddle to the net length of the stirring barrel is lower than 0.2, the disturbing force of the paddle blade on the slurry is reduced, the axial fluidity of the slurry becomes poor, and it is not conducive to the dispersion of particles. When the ratio of the effective action width of the paddle blade of the stirring paddle to the net length of the stirring barrel is greater than 0.8, the axial flow space of the slurry is reduced, resulting in limited horizontal exchange positions of the slurry and increased overall slurry non-uniformity. At the same time, as the effective action width of the paddle blade increases, the shaft power output by the motor will increase significantly, making the equipment uneconomical. When the ratio of the rotation diameter of the paddle blade of the stirring paddle to the inner diameter of the stirring barrel is lower than 0.85, the disturbing performance of the paddle blade on the slurry becomes poor. Especially in the initial stage of stirring, the mixing water will concentrate at the bottom of the stirring barrel, making it difficult to disperse the powder and not conducive to rapid pulp making.

[0008] Preferably, the stirring paddle includes a stirring shaft, and at least one group of paddle blades is arranged along the axial direction on the stirring shaft. Each group of paddle blades includes at least one paddle blade arranged along the circumferential direction of the stirring shaft, and the range of the axial angle α of the paddle blade is 15 - 80°. The axial angle α of the paddle blade directly affects the dispersion effect and the output torque of the motor. When α is greater than 80°, the pressure of the paddle blade on the slurry decreases, which is not conducive to the axial movement of the slurry and affects the dispersion effect. When α is less than 15°, although the pressure of the paddle blade on the slurry is increased, the disturbance of the slurry is enhanced, and it is also conducive to the dispersion effect of particles, but it will greatly increase the output torque of the motor, increase the manufacturing cost, and lose the economy and scientific nature of the equipment.

[0009] Preferably, at least two sets of blades are arranged along the axial direction on the stirring shaft, and the axial angles α of two adjacent sets of blades are arranged in opposite directions. When rotating at a high speed, since two adjacent sets of blades are staggeredly connected to the shaft and the axial angles α of the blades are opposite, when the slurry is rapidly thrown out along the end face and inclined surface of one set of blades, it will immediately impact the water-facing surface of the adjacent two sets of blades, thereby improving the dispersion effect of the particles and the shearing effect on the slurry.

[0010] Preferably, the driving mechanism includes a driving motor for driving the stirring paddle to rotate and a measuring element for measuring the current and / or power of the driving motor, and the measuring element is connected to the driving motor. By adding the measuring element to measure the current and / or power of the driving motor, the corresponding value of the fluidity of the slurry can be obtained through the current and / or power.

[0011] Preferably, the driving mechanism further includes a first connecting cylinder, and the output shaft end of the driving motor is inserted into the first connecting cylinder. The added first connecting cylinder facilitates the installation of the driving motor.

[0012] Preferably, the output shaft of the driving motor is located inside the first connecting cylinder, and a coupling for connecting the stirring shaft of the stirring paddle is installed on the output shaft of the driving motor. The added coupling facilitates the connection between the output shaft of the driving motor and the stirring shaft of the stirring paddle; at the same time, designing the coupling inside the first connecting cylinder can also play a role in dust prevention.

[0013] Preferably, a second connecting cylinder is further included. The second connecting cylinder is coaxially connected to the first connecting cylinder, and the second connecting cylinder and the driving motor are respectively arranged at both ends of the first connecting cylinder.

[0014] Preferably, a bearing seat is provided on the inner wall of the second connecting cylinder, and a bearing matching with the stirring shaft of the stirring paddle is installed in the bearing seat. The number of bearing seats is two, and the two bearing seats are respectively arranged on the inner walls at both ends of the second connecting cylinder, and the number of bearings is also two correspondingly. By adding the second connecting cylinder and adding bearings for installing the stirring paddle inside the second connecting cylinder, the installation of the stirring paddle is facilitated; by adopting double-bearing fixation, the stability of the high-speed rotation of the stirring paddle is ensured, and it is also convenient to disassemble and clean the stirring barrel.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. By designing the mixing barrel as a sealed structure and the mixing paddle as a high-speed rotating one, under the action of centrifugal acceleration, the high-speed rotating cement particles continuously impact the barrel wall and shear each other, causing the material to be fully disturbed, evenly mixed, and thoroughly dispersed in the mixing barrel, creating sufficient conditions for the full hydration of cement, and thus making the various indicators of the grout slurry produced better than those of the grout slurry produced by the existing pulp-making machines.

[0017] 2. By designing the mixing barrel as a horizontal structure, as the mixing paddle rotates, a turbulent zone is formed on the back water surface of the paddle blade of the mixing paddle. The slurry will flow randomly and collide with each other in the mixing barrel, enabling the rapid dispersion of cement particles and the full hydration of cement molecules.

[0018] 3. By designing the rotation speed of the mixing paddle to be greater than or equal to 400 rpm and the linear velocity of the paddle blade of the mixing paddle to be greater than or equal to 7 m / s, under the action of centrifugal acceleration, the high-speed rotating cement particles continuously impact the barrel wall and shear each other, causing the material to be fully disturbed, evenly mixed, and thoroughly dispersed in the mixing barrel, creating sufficient conditions for the full hydration of cement, and thus making the various indicators such as fluidity and bleeding rate of the grout slurry produced better than those of the grout slurry produced by the existing pulp-making machines.

[0019] 4. When the ratio of the rotation diameter of the paddle blade of the mixing paddle to the inner diameter of the mixing barrel is lower than 0.85, the disturbance performance of the paddle blade on the slurry becomes poor. Especially in the initial stage of mixing, the mixing water will concentrate at the bottom of the mixing barrel, making it difficult to disperse the powder materials and being unfavorable for rapid pulp making.

[0020] 5. The axial angle α of the paddle blade directly affects the dispersion effect and the output torque of the motor. When α is greater than 80°, the pressure of the paddle blade on the slurry decreases, which is unfavorable for the axial movement of the slurry and affects the dispersion effect. When α is less than 15°, although the pressure of the paddle blade on the slurry is increased, the disturbance of the slurry is enhanced, and it is also beneficial to the dispersion effect of the particles, but it will greatly increase the output torque of the motor, increase the manufacturing cost, and lose the economy and scientificity of the equipment.

[0021] 6. During high-speed rotation, since two adjacent groups of paddle blades are stagger-connected to the shaft and the axial angles α of the paddle blades are opposite, when the slurry is quickly thrown out along the end face and inclined face of one group of paddle blades, it will immediately impact the water-facing surface of the adjacent two groups of paddle blades, thereby improving the dispersion effect of the particles and the shearing effect on the slurry.

[0022] 7. When the ratio of the effective action width of the paddle blades of the stirring paddle to the net length of the stirring barrel is lower than 0.2, the disturbing force of the paddle blades on the slurry is reduced, the axial fluidity of the slurry becomes poor, which is not conducive to the dispersion of particles; when the ratio of the effective action width of the paddle blades of the stirring paddle to the net length of the stirring barrel is greater than 0.8, the axial flow space of the slurry is reduced, resulting in limited horizontal exchange positions of the slurry, increasing the overall non-uniformity of the slurry. At the same time, as the effective action width of the paddle blades increases, the shaft power output by the motor will increase significantly, making the equipment lose its economy;

[0023] 8. By adding a measuring element to measure the current and / or power of the driving motor, the corresponding value of the fluidity of the slurry can be obtained through the current and / or power;

[0024] 9. By connecting the measuring element to a host computer such as a numerical control machine to achieve real-time communication, once the fluidity of the slurry reaches the standard, the host computer can alarm to prompt the operator or directly stop and alarm, which can ensure the best effect of pulp making on the one hand and save time and energy on the other hand;

[0025] 10. The added first connecting cylinder facilitates the installation of the driving motor;

[0026] 11. The added coupling facilitates the connection between the output shaft of the driving motor and the stirring shaft of the stirring paddle;

[0027] 12. Designing the coupling inside the first connecting cylinder can also play a role in dust prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a pulp making device.

[0029] Figure 2 It is a schematic structural diagram of the stirring barrel and the stirring paddle.

[0030] Figure 3 It is a schematic structural diagram of the stirring paddle.

[0031] Figure 4 It is Figure 3 The structural schematic diagram after rotating 90°.

[0032] Figure 5 It is Figure 1 The partial enlarged structural schematic diagram of

[0033] Figure 6 It is a schematic structural diagram before the stirring barrel and the second connecting cylinder are assembled.

[0034] Figure 7 It is a schematic structural diagram after the stirring barrel and the second connecting cylinder are assembled.

[0035] Figure 8It is a structural schematic diagram before the flexible joint locking ring is assembled with the second connecting cylinder.

[0036] Figure 9 It is a structural schematic diagram after the flexible joint locking ring is assembled with the second connecting cylinder.

[0037] Figure 10 It is a structural schematic diagram of the weighing mechanism.

[0038] Figure 11 It is a structural schematic diagram of the hopper.

[0039] Figure 12 It is a structural schematic diagram of the bleeding test mechanism.

[0040] As shown in the figure: mixing barrel 1, mixing paddle 2, mixing shaft 2a, paddle blade 2b, driving mechanism 3, driving motor 3a, first connecting cylinder 3b, coupling 3c, second connecting cylinder 3d, bearing seat 3e, bearing 3f, sealing assembly 4, mixing paddle shaft sealing seat 4a, mixing paddle shaft skeleton oil seal 4b, first mixing paddle shaft sealing ring 4c, sealing seat convex ring 4d, second mixing paddle shaft sealing ring 4e, quick-connect assembly 5, connecting plate 5a, end cover 5b, flexible joint locking ring 5c, elastic member 5d, sliding positioning bead 5e, sliding positioning slot 5f, docking positioning hole 5g, docking positioning post 5h, mixing barrel mouth sealing ring 5i, weighing mechanism 6, weighing mounting frame 6a, weighing sensor 6b, hopper mounting frame 6c, hopper 6d, hopper movable plug 6e, insertion ear 6f, insertion post 6g, weighing mounting frame mounting flange 6h, movable plug operating rod 6i, pull ring 6j, support base 7, water tank 8, bleeding test mechanism 9, transparent bleeding test cylinder body 9a, bleeding test cylinder body cover 9b, pressure air quick connector 9c, image acquisition device 9d, bleeding test gasket 9e. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Please refer to Figures 1 to 12, in the embodiments of the present invention, a slurry making device for a prestressed duct grouting material capable of measuring fluidity includes a mixing barrel 1, a mixing paddle 2 and a driving mechanism 3 that cooperate with each other. The mixing barrel 1 is a sealed structure. The mixing paddle 2 is rotatably installed in the mixing barrel 1 at a high speed. The driving mechanism 3 is used to drive the mixing paddle 2 to rotate at a high speed. By designing the mixing barrel as a sealed structure and the mixing paddle to rotate at a high speed, the cement particles rotating at a high speed, under the action of centrifugal acceleration, continuously impact the barrel wall and shear each other, so that the material is fully disturbed, mixed evenly and dispersed thoroughly in the mixing barrel, creating sufficient conditions for the full hydration of cement, and thus making the various indexes of the prepared grouting material slurry better than those of the grouting material slurry prepared by the existing slurry making machine.

[0043] The above-mentioned mixing barrel 1 is of a horizontal structure, and the rotation speed of the mixing paddle 2 is greater than or equal to 400 rpm. By designing the mixing barrel as a horizontal structure, as the mixing paddle rotates, a turbulent flow area is formed on the back surface of the paddle blade of the mixing paddle, and the slurry will show irregular flow and mutual impact in the mixing barrel, so that the cement particles are quickly dispersed and the cement molecules are fully hydrated; by designing the rotation speed of the mixing paddle to be greater than or equal to 400 rpm and the linear velocity of the paddle blade 2b of the mixing paddle to be greater than or equal to 7 m / s, the cement particles rotating at a high speed, under the action of centrifugal acceleration, continuously impact the barrel wall and shear each other, so that the material is fully disturbed, mixed evenly and dispersed thoroughly in the mixing barrel, creating sufficient conditions for the full hydration of cement, and thus making the various indexes of the prepared grouting material slurry, such as fluidity, bleeding rate, etc., better than those of the grouting material slurry prepared by the existing slurry making machine.

[0044] The ratio of the rotation diameter of the paddle blade of the above-mentioned mixing paddle 2 to the inner diameter of the mixing barrel 1 is greater than or equal to 0.7 and less than 1, and the ratio of the effective action width of the paddle blade of the mixing paddle 2 to the net length of the mixing barrel 1 is 0.2 - 0.8. When the ratio of the effective action width of the paddle blade of the mixing paddle to the net length of the mixing barrel is lower than 0.2, the disturbing force of the paddle blade on the slurry is reduced, the axial fluidity of the slurry becomes poor, and it is not conducive to the dispersion of particles; when the ratio of the effective action width of the paddle blade of the mixing paddle to the net length of the mixing barrel is greater than 0.8, the axial flow space of the slurry is reduced, resulting in limited horizontal exchange positions of the slurry, increased overall slurry non-uniformity. At the same time, as the effective action width of the paddle blade increases, the shaft power output by the motor will increase significantly, making the equipment uneconomical. When the ratio of the rotation diameter of the paddle blade of the mixing paddle to the inner diameter of the mixing barrel is lower than 0.85, the disturbing performance of the paddle blade on the slurry becomes poor. Especially in the initial stage of mixing, the mixing water will concentrate at the bottom of the mixing barrel, causing difficulty in dispersing the powder material and being not conducive to rapid slurry making.

[0045] The above-mentioned stirring paddle 2 includes a stirring shaft 2a, and at least one set of paddle blades 2b is arranged on the stirring shaft 2a along the axial direction. Each set of paddle blades 2b includes at least one paddle blade 2b arranged along the circumferential direction of the stirring shaft 2a. The range of the axial angle α of the paddle blade 2b is 15 - 80°. The axial angle α of the paddle blade directly affects the dispersion effect and the output torque of the motor. When α is greater than 80°, the pressure of the paddle blade on the slurry decreases, which is not conducive to the axial movement of the slurry and affects the dispersion effect. When α is less than 15°, although the pressure of the paddle blade on the slurry is increased, the disturbance of the slurry is increased, and it is also beneficial to the dispersion effect of the particles, but it will greatly increase the output torque of the motor, increase the manufacturing cost, and lose the economy and scientific nature of the equipment. When at least two sets of paddle blades 2b are arranged on the stirring shaft 2a along the axial direction, the arrangement directions of the axial angles α of the adjacent two sets of paddle blades 2b are opposite. When rotating at a high speed, since the adjacent two sets of paddle blades are staggeredly connected to the shaft, and the axial angles α of the paddle blades are opposite, when the slurry is quickly thrown out along the end face and inclined surface of one set of paddle blades, it will immediately impact the water-facing surface of the adjacent two sets of paddle blades, thereby improving the dispersion effect of the particles and the shearing effect on the slurry.

[0046] The above-mentioned driving mechanism 3 includes a driving motor 3a for driving the rotation of the stirring paddle 2 and a measuring element for measuring the current and / or power of the driving motor 3a. The measuring element is connected to the driving motor 3a. By adding the measuring element to measure the current and / or power of the driving motor, the corresponding value of the fluidity of the slurry can be obtained through the current and / or power. The driving mechanism 3 also includes a first connecting cylinder 3b, and the output shaft end of the driving motor 3a is inserted into the first connecting cylinder 3b. The added first connecting cylinder facilitates the installation of the driving motor. The output shaft of the driving motor 3a is located in the first connecting cylinder 3b, and a coupling 3c for connecting the stirring shaft 2a of the stirring paddle 2 is installed on the output shaft of the driving motor 3a. The added coupling facilitates the connection between the output shaft of the driving motor and the stirring shaft of the stirring paddle; at the same time, designing the coupling in the first connecting cylinder can also play a role in dust prevention. It also includes a second connecting cylinder 3d, the second connecting cylinder 3d is coaxially connected to the first connecting cylinder 3b, and the second connecting cylinder 3d and the driving motor 3a are respectively arranged at both ends of the first connecting cylinder 3b. A bearing seat 3e is provided on the inner wall of the second connecting cylinder 3d, and a bearing 3f cooperating with the stirring shaft 2a of the stirring paddle 2 is installed in the bearing seat 3e. The number of the bearing seats 3e is two, and the two bearing seats 3e are respectively arranged on the inner walls at both ends of the second connecting cylinder 3d, and the number of the bearings 3f is also two correspondingly. By adding the second connecting cylinder and adding bearings for installing the stirring paddle in the second connecting cylinder, the installation of the stirring paddle is facilitated; by using double-bearing fixation, the stability of the high-speed rotation of the stirring paddle is ensured, and it is also convenient to remove the stirring barrel for cleaning.

[0047] A pulping device, comprising a stirring barrel 1 and a stirring paddle 2 which cooperate with each other, as well as a driving mechanism 3, a sealing assembly 4, a quick-connect assembly 5, a weighing mechanism 6 and a bleeding test mechanism 9. The stirring barrel 1 is of a sealed structure. The stirring paddle 2 is rotatably installed in the stirring barrel 1 at a high speed. The driving mechanism 3 is used to drive the stirring paddle 2 to rotate at a high speed. The sealing assembly 4 is used for sealing the stirring barrel 1. The quick-connect assembly 5 is used for the quick installation and disassembly of the stirring barrel 1. The weighing mechanism 6 is used for weighing materials and conveying the materials into the stirring barrel 1. The bleeding test mechanism 9 is used for measuring the bleeding rate of the prepared grouting slurry. By designing the stirring barrel 1 as a sealed structure and the stirring paddle 2 as a high-speed rotating one, the high-speed rotating cement particles continuously impact the barrel wall and shear each other under the action of centrifugal acceleration, so that the materials are fully disturbed, mixed evenly and dispersed thoroughly in the stirring barrel, creating sufficient conditions for the full hydration of cement, and thus the indexes of the prepared grouting slurry are all better than those of the grouting slurry prepared by the existing pulping machines.

[0048] The stirring equipment in the pharmaceutical industry is mainly applied to material mixing, including dry powder mixing and solid-liquid and liquid-liquid mixing. The rotation speed of the mixer (apparatus) is not high, generally not exceeding 300 rpm. While the homogenizer in the chemical industry has a very high rotation speed, but it is mainly used for shearing, which is essentially different from this stirring barrel 1.

[0049] A stirring barrel inlet is provided at the upper part of the above-mentioned stirring barrel 1, and a sealing cover is installed on the stirring barrel inlet. A stirring barrel water inlet and a stirring barrel outlet are also provided on the stirring barrel 1. The stirring barrel water inlet is communicated with a water source through a water inlet valve. A discharge valve is provided at the stirring barrel outlet.

[0050] The above-mentioned mixing barrel 1 is of a horizontal structure. By designing the mixing barrel 1 as a horizontal structure, as the mixing paddle 2 rotates, a turbulent zone is formed on the back surface of the paddle blade 2b of the mixing paddle 2. The slurry will flow randomly and collide with each other in the mixing barrel 1, enabling the cement particles to be rapidly dispersed and the cement molecules to be fully hydrated. The rotation speed of the mixing paddle 2 is greater than or equal to 400 rpm. By designing the rotation speed of the mixing paddle 2 to be greater than or equal to 400 rpm and the linear velocity of the paddle blade 2b of the mixing paddle 2 to be greater than or equal to 7 m / s, the high-speed rotating cement particles will continuously collide with the barrel wall and shear each other under the action of centrifugal acceleration, causing the material to be fully disturbed, mixed evenly, and dispersed thoroughly in the mixing barrel 1, creating sufficient conditions for the full hydration of cement. As a result, the various indexes of the grouting material slurry prepared, such as fluidity and bleeding rate, are better than those of the grouting material slurry prepared by the existing pulp-making machine. The ratio of the rotation diameter of the paddle blade of the mixing paddle 2 to the inner diameter of the mixing barrel 1 is greater than or equal to 0.7 and less than 1. When the ratio of the rotation diameter of the paddle blade of the mixing paddle 2 to the inner diameter of the mixing barrel 1 is lower than 0.85, the disturbance performance of the paddle blade 2b to the slurry becomes poor. Especially in the initial stage of mixing, the mixing water will concentrate at the bottom of the mixing barrel, making it difficult to disperse the powder and being unfavorable for rapid pulp making. The ratio of the effective action width of the paddle blade of the mixing paddle 2 to the net length of the mixing barrel 1 is 0.2 - 0.8, that is, 0.2 ≤ (b1 + b2 + b3 + b4) / b0 ≤ 0.80 in the figure. When the ratio of the effective action width of the paddle blade of the mixing paddle 2 to the net length of the mixing barrel 1 is lower than 0.2, the disturbing force of the paddle blade 2b to the slurry is reduced, and the axial fluidity of the slurry becomes poor, which is unfavorable for particle dispersion; when the ratio of the effective action width of the paddle blade of the mixing paddle 2 to the net length of the mixing barrel 1 is greater than 0.8, the axial flow space of the slurry is reduced, resulting in limited horizontal exchange positions of the slurry and increased overall slurry non-uniformity. At the same time, as the effective action width of the paddle blade increases, the shaft power output by the motor will increase significantly, making the equipment uneconomical.

[0051] The above-mentioned stirring paddle 2 includes a stirring shaft 2a, and at least one set of paddle blades 2b is arranged axially on the stirring shaft 2a. Each set of paddle blades 2b includes at least one paddle blade 2b arranged along the circumferential direction of the stirring shaft 2a. The axial angle α of the paddle blade 2b ranges from 15° to 80°. The axial angle α of the paddle blade 2b directly affects the dispersion effect and the output torque of the motor. When α is greater than 80°, the pressure of the paddle blade 2b on the slurry decreases, which is not conducive to the axial movement of the slurry and affects the dispersion effect. When α is less than 15°, although the pressure of the paddle blade 2b on the slurry is increased and the disturbance of the slurry is increased, which is also beneficial to the dispersion effect of the particles, it will greatly increase the output torque of the motor, increase the manufacturing cost, and lose the economy and scientificity of the equipment. At least two sets of paddle blades 2b are arranged axially on the stirring shaft 2a, and the arrangement directions of the axial angles α of the adjacent two sets of paddle blades 2b are opposite. When rotating at a high speed, since the adjacent two sets of paddle blades 2b are staggeredly connected to the shaft and the axial angles α of the paddle blades 2b are opposite, when the slurry is quickly thrown out along the end face and inclined plane of one set of paddle blades 2b, it will immediately impact the water-facing surface of the adjacent two sets of paddle blades 2b, thereby improving the dispersion effect of the particles and the shearing effect on the slurry.

[0052] The above-mentioned quick-connecting component 5 includes a connecting disk 5a arranged at the mouth of the stirring barrel 1 and an end cover 5b matched with the connecting disk 5a. Both the end cover 5b and the connecting disk 5a are annular structures. The end cover 5b is hermetically connected to the connecting disk 5a. A movable joint locking ring 5c that can be circumferentially positioned and rotated is sleeved on the outer wall of the end cover 5b. An internal thread is provided on one side of the inner wall of the movable joint locking ring 5c facing the connecting disk 5a, and an external thread matched with the internal thread is provided on the outer wall of the connecting disk 5a. Generally, it is necessary to regularly remove the stirring barrel 1 for cleaning and maintenance. The existing connection methods between the stirring barrel and the end cover are: flange connection, clamp connection, snap connection, and screw connection. Flange connection requires bolt tightening, which is time-consuming and laborious to disassemble; clamp connection requires a large chuck, and two people must operate when the chuck is butted and the clamp is put on; snap connection has a relatively complex structure and requires a large space; the application range of screw connection is limited. However, with this quick-connecting component, the connection and disassembly between the connecting disk 5a and the end cover 5b can be easily and conveniently completed by rotating the movable joint locking ring 5c, thereby greatly reducing the labor intensity and greatly improving the efficiency.

[0053] A plurality of sliding positioning beads 5e are installed on the inner wall of the above-mentioned movable joint locking ring 5c along the circumferential direction through elastic members 5d. Sliding positioning grooves 5f are arranged along the circumferential direction on the outer wall of the end cover 5b corresponding to the positions of the sliding positioning beads 5e. Of course, other structures can also be adopted. The elastic member 5d is a spring. Of course, other types of elastic members can also be adopted.

[0054] A mating docking positioning hole 5g and a docking positioning post 5h are provided between the above-mentioned end cap 5b and the connection disk 5a. The docking positioning hole 5g is provided on the end cap 5b or the connection disk 5a, and the corresponding docking positioning post 5h is provided on the connection disk 5a or the end cap 5b. The added mating docking positioning hole 5g and docking positioning post 5h facilitate the connection between the end cap 5b and the connection disk 5a, thereby further improving the efficiency. The docking positioning holes 5g are arranged at intervals along the circumferential direction of the end cap 5b or the connection disk 5a. A sealing ring 5i for the mouth of the stirring barrel is provided between the end cap 5b and the connection disk 5a.

[0055] The above-mentioned sealing assembly 4 includes a stirring paddle shaft seal seat 4a, a stirring paddle shaft skeleton oil seal 4b, and a first stirring paddle shaft sealing ring 4c. A stirring paddle shaft mounting hole that mates with the stirring shaft 2a of the stirring paddle 2 is provided in the middle of the stirring paddle shaft seal seat 4a. The stirring paddle shaft skeleton oil seal 4b and the first stirring paddle shaft sealing ring 4c are respectively installed axially in the stirring paddle shaft mounting hole. A seal seat mounting hole that mates with the outer diameter of the stirring paddle shaft seal seat 4a is provided in the middle of the end cap 5b. During installation, the stirring paddle shaft seal seat 4a is sealingly installed in the seal seat mounting hole, and the stirring paddle shaft seal seat 4a is sleeved on the stirring shaft 2a of the stirring paddle 2. The first stirring paddle shaft sealing ring 4c is arranged on the side facing the paddle blade 2b of the stirring paddle 2. In the working state, the slurry has a tendency to invade the sealing assembly 4 axially along the stirring shaft 2a. Since the slurry contains particles of different sizes, when the stirring shaft 2a rotates, the slurry adheres to the shaft, which will inevitably cause friction on the sealing material. In particular, the slurry remaining in the gaps of the sealing material will solidify into larger hard particles and is not easily removed. Over time, it will damage the seal and cause leakage. If only oil seal sealing, soft packing sealing, sealing rings, etc. are used alone, the above phenomena will occur. However, this sealing assembly 4 adopts a combined structure of a sealing ring and a skeleton oil seal, which can effectively prevent the slurry from invading the seal body along the rotating stirring shaft 2a, thereby increasing the service life.

[0056] On one side of the above-mentioned stirring paddle shaft seal seat 4a facing the paddle blade 2b, a seal seat convex ring 4d facilitating cleaning is provided along the circumferential direction of the stirring paddle shaft mounting hole. The added seal seat convex ring 4d can cause a turbulent effect of the cleaning water at this position, so that the slurry and particles on the sealing slurry-facing surface of the shaft and the sealing ring can be easily washed away, minimizing the residual slurry at this position to the greatest extent, and further improving the service life. A second stirring paddle shaft sealing ring 4e is provided on the inner wall of the seal seat convex ring 4d. By designing two sealing rings, there is a gap between the sealing rings and between the sealing ring and the skeleton oil seal, so that the lubricating oil can be preserved in the gap. During the stirring operation, an oil film will be formed at the interface where the stirring shaft 2a and the sealing ring move relative to each other, which not only reduces friction but also forms a seal, thus further improving the service life.

[0057] The above-mentioned second stirring paddle shaft sealing ring 4e and the first stirring paddle shaft sealing ring 4c are arranged at intervals, and the second stirring paddle shaft sealing ring 4e is arranged at the port of the seal seat convex ring 4d facing the paddle blade 2b. By arranging the second stirring paddle shaft sealing ring 4e at the port of the seal seat convex ring 4d facing the paddle blade 2b, the second stirring paddle shaft sealing ring 4e is made as close as possible to the port of the seal seat convex ring 4d facing the paddle blade 2b, which can further reduce the gap between the inner wall of the seal seat convex ring 4d and the stirring shaft 2a, thus avoiding the residue of slurry and improving the service life. A fillet is provided at the outer edge of the port of the seal seat convex ring 4d facing the paddle blade 2b. By designing the outer edge of the port of the seal seat convex ring 4d facing the paddle blade 2b as a fillet, it is beneficial to the formation of the turbulent effect, so that the slurry and particles on the sealing slurry-facing surface of the shaft and the sealing ring can be washed away more conveniently.

[0058] The above-mentioned driving mechanism 3 includes a driving motor 3a for driving the rotation of the stirring paddle 2 and a measuring element for measuring the current and / or power of the driving motor 3a, and the measuring element is connected to the driving motor 3a. By adding the measuring element to measure the current and / or power of the driving motor 3a, the corresponding value of the fluidity of the slurry can be obtained through the current and / or power. The measuring element is connected to the upper computer. By connecting the measuring element to the upper computer such as a numerical control machine to achieve real-time communication, once the fluidity of the slurry reaches the standard, the upper computer can alarm to prompt the operator to operate, or directly stop and alarm. On the one hand, this can ensure the best effect of pulp making, and on the other hand, it can save time and energy.

[0059] The above-mentioned driving mechanism 3 further includes a first connecting cylinder 3b, and the output shaft end of the driving motor 3a is inserted into the first connecting cylinder 3b. The added first connecting cylinder 3b facilitates the installation of the driving motor 3a. The output shaft of the driving motor 3a is located inside the first connecting cylinder 3b, and a coupling 3c for connecting the stirring shaft 2a of the stirring paddle 2 is installed on the output shaft of the driving motor 3a. The added coupling 3c facilitates the connection between the output shaft of the driving motor 3a and the stirring shaft 2a of the stirring paddle 2; at the same time, designing the coupling 3c inside the first connecting cylinder 3b can also play a role in dust prevention. To facilitate the installation of the coupling 3c, an installation window is provided on the first connecting cylinder 3b, and a sealing cover can be installed on the installation window.

[0060] The above-mentioned driving mechanism 3 further includes a second connecting cylinder 3d. One end of the second connecting cylinder 3d is coaxially connected to the first connecting cylinder 3b, and the other end of the second connecting cylinder 3d is connected to the end cover 5b, and the second connecting cylinder 3d and the driving motor 3a are respectively arranged at both ends of the first connecting cylinder 3b. The second connecting cylinder 3d and the end cover 5b are integrally formed by welding and form a step for installing and clamping the stirring paddle shaft seal seat 4a, and a sealing ring is installed in the step. A bearing seat 3e is provided on the inner wall of the second connecting cylinder 3d, and a bearing 3f that cooperates with the stirring shaft 2a of the stirring paddle 2 is installed in the bearing seat 3e. By adding the second connecting cylinder 3d and adding the bearing 3f for installing the stirring paddle 2 inside the second connecting cylinder 3d, the installation of the stirring paddle 2 is facilitated. At the same time, the stirring paddle shaft seal seat 4a is fixedly installed on the corresponding bearing seat 3e by bolts. The number of the bearing seats 3e is two, and the two bearing seats 3e are respectively arranged on the inner walls at both ends of the second connecting cylinder 3d, and the number of the bearings 3f is also two correspondingly. By adopting double-bearing fixation, both the stability of the high-speed rotation of the stirring paddle 2 is ensured and the stirring barrel 1 is convenient to be removed and cleaned.

[0061] The above-mentioned weighing mechanism 6 includes a weighing mounting frame 6a, a weighing sensor 6b, a hopper mounting frame 6c and a hopper 6d. The hopper 6d is installed on the hopper mounting frame 6c, the hopper mounting frame 6c is installed on the weighing sensor 6b, the weighing sensor 6b is installed at the upper end of the weighing mounting frame 6a, and a hopper movable plug 6e for blocking the discharge port is provided at a position corresponding to the discharge port of the hopper 6d inside the hopper 6d. This weighing mechanism 6 can quickly and accurately measure the weight of the material in the discharge hopper 6d through the weighing sensor 6b, thereby improving the quality of pulp making.

[0062] On the outer walls on both sides of the above-mentioned hopper 6d, there is respectively provided an insertion ear 6f. At positions corresponding to the two insertion ears 6f on the hopper mounting frame 6c, there is respectively provided an insertion post 6g, and the insertion post 6g is matched with the insertion ear 6f. By adding the insertion post 6g and the insertion ear 6f, on the one hand, it can realize removing the hopper 6d for loading, which facilitates the operation. On the other hand, when the weighing sensor is damaged, weighing can also be realized by directly weighing the hopper 6d. At the lower end of the weighing mounting frame 6a, there is provided a weighing mounting frame mounting flange 6h in a semi-circular ring structure. The added weighing mounting frame mounting flange 6h facilitates the installation and disassembly of the weighing mounting frame 6a. The lower end of the weighing mounting frame 6a is mounted on the flange of the connecting cylinder through the weighing mounting frame mounting flange 6h.

[0063] The above-mentioned hopper movable plug 6e is of a frustum structure. The small-head end of the frustum structure is arranged downward, and the diameter of the small-head end of the frustum structure is smaller than the diameter of the discharge port, and the diameter of the large-head end of the frustum structure is larger than the diameter of the discharge port. By designing the hopper movable plug 6e as a frustum structure, and arranging the small-head end of the frustum structure downward, and the diameter of the small-head end of the frustum structure is smaller than the diameter of the discharge port, and the diameter of the large-head end of the frustum structure is larger than the diameter of the discharge port, this facilitates the blocking and opening of the hopper movable plug 6e. One side of the hopper movable plug 6e is movably connected with a movable plug operating rod 6i. By movably connecting the movable plug operating rod 6i to one side of the hopper movable plug 6e, when the hopper movable plug 6e is lifted upward by the movable plug operating rod 6i, the hopper movable plug 6e will gradually change from a horizontal state to a vertical state under its own weight and the pressure of the material, thereby opening the discharge port; and when it is necessary to block the discharge port, during the process of putting the hopper movable plug 6e back to the discharge port by the movable plug operating rod 6i, the hopper movable plug 6e will gradually change from a vertical state to a horizontal state again; the above operation process is simple, convenient and efficient. At the upper end of the movable plug operating rod 6i, there is provided a pull ring 6j that facilitates operation. The added pull ring 6j facilitates manual or mechanical operation.

[0064] A bleeding test mechanism 9 is provided at a position on the support base 7 corresponding to the mixing barrel 1. The bleeding test mechanism 9 includes a transparent bleeding test cylinder body 9a and a bleeding test cylinder cover 9b that cooperate with each other. The transparent bleeding test cylinder body 9a and the bleeding test cylinder cover 9b can both be made of plexiglass. The transparent bleeding test cylinder body 9a is installed on the support base 7. During the test, the levelness of the transparent bleeding test cylinder body 9a needs to be ensured. A scale is provided on the outer wall of the transparent bleeding test cylinder body 9a, and a pressure air quick connector 9c is provided on the bleeding test cylinder cover 9b. By pouring the prepared grout slurry into the transparent bleeding test cylinder body 9a, covering the bleeding test cylinder cover 9b, and then introducing pressure air through the pressure air quick connector 9c, the bleeding test of the grout slurry can be completed on-site, with simple, convenient, and fast operation. An image acquisition device 9d is provided on the support base 7 at a position corresponding to the scale on the outer wall of the transparent bleeding test cylinder body 9a. The image acquisition device 9d is arranged facing the scale, and the image acquisition device 9d is connected to the upper computer. The initial liquid level height a1 of the grout slurry is collected by the image acquisition device 9d. After standing for 10 minutes, the compressed air valve is opened, and the pressure is quickly increased to the test pressure through the pressure air quick connector 9c. After pressurizing for 5 minutes, the bleeding water surface height a2 and the height a3 of the cement slurry surface after pressurization are collected by the image acquisition device 9d again. In this way, the pressure bleeding rate can be accurately calculated. Since the whole process does not require human eye recognition, the error is greatly reduced, and the accuracy of the test is improved. A bleeding test gasket 9e is provided between the transparent bleeding test cylinder body 9a and the bleeding test cylinder cover 9b. The added bleeding test gasket 9e improves the sealing performance of the bleeding test, thereby further improving the accuracy of the test. The pressure air quick connector 9c is connected to a compressed air gas source that provides a maximum pressure not less than 0.8 MPa, and is equipped with a pressure gauge with a maximum reading not less than 1.0 MPa and a minimum scale value of 0.02 MPa.

[0065] At the start of the bleeding test, inject about 200 ml of the prepared slurry into the transparent bleeding test cylinder body 9a, then tightly cover the bleeding test cylinder cover 9b, and connect the pressure air quick connector 9c. Start video recording and record the initial height as a1. After standing for 10 minutes, open the compressed air valve and quickly increase the pressure to the test pressure. After pressurizing for 5 minutes, video record the bleeding water surface height a2 and the height a3 of the cement slurry surface after pressurization.

[0066] Calculate the pressure bleeding rate (M yl ):

[0067] M yl ——— Pressure bleeding rate

[0068] a1 — The initial height of the cement slurry, in millimeters (mm);

[0069] a2—the height of the water seepage surface, in millimeters (mm);

[0070] a3—the height after pressurization, in millimeters (mm);

[0071] The above results are all automatically completed by the host computer connected to the image acquisition device 9d, and the results can be automatically displayed and have an upload function. During the same period, the pressure water seepage rate should be the arithmetic mean of two parallel test data (accurate to 0.1%) as the test result of this period.

[0072] During installation, first install the first connecting cylinder 3b and the second connecting cylinder 3d together; then, install the bearing, the mixing paddle shaft seal seat 4a, the mixing paddle shaft sealing ring and the mixing paddle shaft skeleton oil seal 4b; next, insert the mixing paddle 2; then, install the assembled part on the support base 7 through the support. A water tank 8 is also installed on the support base 7; then, align the docking positioning hole 5g and / or the docking positioning post 5h on the mixing barrel 1 with the docking positioning post 5h and / or the docking positioning hole 5g on the end cover 5b, and close them. Then, buckle the threaded rotary joint locking ring 5c to complete the installation of the mixing barrel 1; at the same time, complete the installation of the drive motor 3a; finally, install the weighing mechanism on the flange of the connecting cylinder through the flange 6h of the weighing installation frame. After installation, the discharge port of the hopper 6d is aligned with the mixing barrel inlet on the mixing barrel 1, and the hopper 6d is suspended.

[0073] During operation, first, remove the hopper 6d and add appropriate materials (a little less than the required materials) into it, then install the hopper 6d filled with materials on the hopper installation frame 6c for weighing, and continue to add materials until the materials reach the required amount, or directly add materials into the hopper 6d without removing the hopper 6d until the materials reach the required amount; then, operate the piston operating rod 6i to pour the materials into the mixing barrel 1, and add the corresponding amount of water into the mixing barrel 1 through the water inlet valve; next, cover and seal the mixing barrel inlet on the mixing barrel 1; then start the drive motor 3a to make the mixing paddle 2 reach the preset speed. When the measuring element detects that the fluidity of the slurry reaches the standard, control the drive motor 3a to stop; finally, open the discharge valve on the mixing barrel 1 to discharge the slurry.

[0074] The principle of the above measuring element detecting the fluidity of the slurry is based on the relationship between the power of the drive motor 3a and the fluidity of the slurry, specifically as follows:

[0075] Through repeated practice in the pulping process, it is found that: 1. After the feeding is completed, as the rotation speed of the stirring paddle 2 increases, the power of the driving motor 3a gradually and significantly increases, reaches the maximum value after reaching the set maximum rotation speed, and then slowly decreases. After the slurry is stirred evenly, the power will drop to a certain value and become basically stable. 2. Under the condition of the same stirring amount (the total mass of the grouting material and the mixing water is the same), due to different grouting material manufacturers or different water-binder ratios, the fluidity is different under the same stirring conditions. At this time, the fluidity has a good linear relationship with the power measured by the driving motor 3a at a certain specific rotation speed. According to the linear relationship diagram, the calculation formula between the two can be obtained as y = ax + b (where y is the power, a is a fixed constant for a certain stirring amount, x is the fluidity, and b is a fixed constant for a certain stirring amount). Therefore, when the stirring amount is fixed, the instantaneous fluidity value can be obtained by measuring the driving power at a specific rotation speed through the above calculation formula.

[0076] In addition, this equipment can also realize the on-site preparation and on-site use of the grouting material. The quality of each component material can be controlled throughout the process, completely eliminating the phenomenon of fraud and ensuring that each preparation of the grouting material fully meets the standards. Specifically, first pour the cement and grouting agent (dry powders such as calcite powder, mineral powder, silica fume, fly ash, water reducer, expansion agent, defoaming agent, etc.) into the mixing barrel 1, where the cement accounts for about 90% and the grouting agent accounts for about 10%. Then cover the sealing cover and start the driving motor 3a until the dry powder is stirred evenly.

[0077] A method for preparing a prestressed duct grouting material includes the following steps:

[0078] S1: Pour the grouting material into the mixing barrel 1 of the pulping equipment;

[0079] S2: Add the corresponding amount of water into the mixing barrel 1;

[0080] S3: Seal the mixing barrel 1;

[0081] S4: Start the driving motor 3a of the pulping equipment to make the stirring paddle 2 in the mixing barrel 1 reach the preset rotation speed;

[0082] S5: When the power of the driving motor 3a is stable, stop the driving motor 3a.

[0083] In this embodiment, the mixing barrel 1 is designed as a sealed structure, and the mixing paddle 2 is designed to rotate at a high speed. In this way, under the action of the centrifugal acceleration, the cement particles rotating at a high speed continuously impact the barrel wall and shear each other, causing the material to be fully disturbed, evenly mixed, and thoroughly dispersed in the mixing barrel, creating sufficient conditions for the full hydration of cement. As a result, the various indicators of the grouting material slurry produced are better than those of the grouting material slurry produced by the existing pulp-making machines. By designing the mixing barrel 1 as a horizontal structure, as the mixing paddle 2 rotates, a turbulent flow area is formed on the back water surface of the blade 2b of the mixing paddle 2. The slurry will flow irregularly and collide with each other in the mixing barrel 1, enabling the cement particles to be quickly dispersed and the cement molecules to be fully hydrated. By designing the rotation speed of the mixing paddle 2 to be greater than or equal to 400 rpm and the linear velocity of the blade 2b of the mixing paddle 2 to be greater than or equal to 7 m / s, in this way, under the action of the centrifugal acceleration, the cement particles rotating at a high speed continuously impact the barrel wall and shear each other, causing the material to be fully disturbed, evenly mixed, and thoroughly dispersed in the mixing barrel 1, creating sufficient conditions for the full hydration of cement. As a result, the various indicators of the grouting material slurry produced, such as fluidity and bleeding rate, are better than those of the grouting material slurry produced by the existing pulp-making machines.

[0084] At the same time, when the ratio of the rotation diameter of the blade of the mixing paddle 2 to the inner diameter of the mixing barrel 1 is lower than 0.85, the disturbance performance of the blade 2b to the slurry becomes poor. Especially in the initial stage of mixing, the mixing water will concentrate at the bottom of the mixing barrel, making it difficult to disperse the powder materials, which is not conducive to rapid pulp making. The axial angle α of the blade 2b directly affects the dispersion effect and the output torque of the motor. When α is greater than 80°, the pressure of the blade 2b on the slurry decreases, which is not conducive to the axial movement of the slurry and affects the dispersion effect. When α is less than 15°, although the pressure of the blade 2b on the slurry is increased, the disturbance to the slurry is increased, which is also conducive to the dispersion effect of the particles, but it will greatly increase the output torque of the motor, increase the manufacturing cost, and lose the economy and scientificity of the equipment. When rotating at a high speed, since two adjacent groups of blades 2b are stagger-connected to the shaft and the axial angles α of the blades 2b are opposite, when the slurry is quickly thrown out along the end face and inclined surface of one group of blades 2b, it will immediately impact the water-facing surface of the adjacent two groups of blades 2b, thereby improving the dispersion effect of the particles and the shearing effect on the slurry. When the ratio of the effective action width of the blade of the mixing paddle 2 to the net length of the mixing barrel 1 is lower than 0.2, the disturbing force of the blade 2b on the slurry is reduced, the axial fluidity of the slurry becomes poor, and it is not conducive to the dispersion of the particles. When the ratio of the effective action width of the blade of the mixing paddle 2 to the net length of the mixing barrel 1 is greater than 0.8, the axial flow space of the slurry is reduced, resulting in limited horizontal exchange positions of the slurry, increased overall slurry non-uniformity. At the same time, as the effective action width of the blade increases, the shaft power output by the motor will increase significantly, making the equipment lose its economy.

[0085] Moreover, it is generally necessary to regularly remove the mixing barrel 1 for cleaning and maintenance. The existing connection methods between the mixing barrel and the end cover include: flange connection, clamp connection, snap connection, and threaded connection. Flange connection requires bolt tightening, which is time-consuming and laborious for disassembly; clamp connection requires a large chuck, and two people must operate when the chuck is butted and the clamp is sleeved; snap connection has a relatively complex structure and requires a large space; the application range of threaded connection is limited. However, with this quick-connection component, the connection and disconnection between the connection plate 5a and the end cover 5b can be easily and conveniently completed by rotating the quick-connect locking ring 5c, thus greatly reducing the labor intensity and significantly improving the efficiency; the added mating docking positioning holes 5g and docking positioning posts 5h facilitate the connection between the end cover 5b and the connection plate 5a, thereby further improving the efficiency; in the working state, the slurry has a tendency to invade the sealing component 4 axially along the stirring shaft 2a. Since the slurry contains particles of different sizes, when the stirring shaft 2a rotates, the slurry adheres to the shaft, which will inevitably cause friction to the sealing material. Especially the slurry remaining in the gaps of the sealing material will solidify into larger hard particles and is not easy to be removed. Over time, the seal will be damaged and leakage will occur. If only oil seal, soft packing seal, sealing ring, etc. are used alone, the above phenomena will occur. However, this sealing component 4 adopts a combined structure of a sealing ring and a skeleton oil seal, which can effectively prevent the slurry from invading the seal body along the rotating stirring shaft 2a, thereby extending the service life.

[0086] Furthermore, the added sealing seat convex ring 4d can cause the cleaning water to form a turbulence effect at this place, so that the slurry and particles on the slurry-facing surface of the shaft and the sealing ring can be easily washed away, minimizing the residual slurry at this place to the greatest extent, and thus further extending the service life; by designing two sealing rings, there are gaps between the sealing rings and between the sealing ring and the skeleton oil seal, so that the lubricating oil can be preserved in the gaps. During the stirring operation, an oil film will be formed at the interface where the stirring shaft 2a and the sealing ring move relative to each other, which not only reduces friction but also forms a seal, thus further extending the service life; by arranging the second stirring paddle shaft sealing ring 4e at the port of the sealing seat convex ring 4d facing the paddle blade 2b, the second stirring paddle shaft sealing ring 4e is as close as possible to the port of the sealing seat convex ring 4d facing the paddle blade 2b, which can further reduce the gap between the inner wall of the sealing seat convex ring 4d and the stirring shaft 2a, thus avoiding the residue of the slurry and extending the service life; by designing the outer edge of the port of the sealing seat convex ring 4d facing the paddle blade 2b into a rounded corner, it is beneficial to the formation of the turbulence effect, so that the slurry and particles on the slurry-facing surface of the shaft and the sealing ring can be more easily washed away.

[0087] In addition, in this embodiment, a measurement element is added to measure the current and / or power of the drive motor 3a, so that the corresponding value of the fluidity of the slurry can be obtained through the current and / or power; by connecting the measurement element to a host computer such as a numerical control machine to achieve real-time communication, once the fluidity of the slurry reaches the standard, the host computer can alarm to prompt the operator to operate, or directly stop the machine and alarm. Thus, on the one hand, the best effect of pulp making can be ensured, and on the other hand, time and energy can be saved; the added first connecting cylinder 3b facilitates the installation of the drive motor 3a; the added coupling 3c facilitates the connection between the output shaft of the drive motor 3a and the stirring shaft 2a of the stirring paddle 2; designing the coupling 3c inside the first connecting cylinder 3b can also play a role in dust prevention; the second connecting cylinder 3d is connected to the end cover 5b by welding and forms a step for installing and clamping the stirring paddle shaft seal seat 4a, and a sealing ring is installed inside the step; the second connecting cylinder 3d is connected to the end cover 5b by welding and forms a step for installing and clamping the stirring paddle shaft seal seat 4a, and a sealing ring is installed inside the step; by using double bearings for fixation, both the stability of the high-speed rotation of the stirring paddle 2 is ensured and it is convenient to remove the stirring barrel 1 for cleaning.

[0088] Furthermore, the weighing mechanism 6 can quickly and accurately measure the weight of the material in the discharge hopper 6d through the weighing sensor 6b, so as to improve the quality of pulp making; through the added insertion column 6g and insertion ear 6f, on the one hand, it is possible to remove the hopper 6d for loading, which facilitates the operation, and on the other hand, when the weighing sensor is damaged, weighing can also be achieved by directly weighing the hopper 6d; the added weighing mounting frame mounting flange 6h facilitates the installation and removal of the weighing mounting frame 6a; by designing the hopper movable plug 6e as a frustum structure, with the small head end of the frustum structure facing downwards and the diameter of the small head end of the frustum structure being smaller than the diameter of the discharge port, and the diameter of the large head end of the frustum structure being larger than the diameter of the discharge port, it is convenient for the hopper movable plug 6e to block and open; by movably connecting a movable plug operating rod 6i to one side of the hopper movable plug 6e, when the hopper movable plug 6e is lifted upwards by the movable plug operating rod 6i, the hopper movable plug 6e will gradually change from a horizontal state to a vertical state under its own weight and the pressure of the material, thus opening the discharge port; when it is necessary to block the discharge port, during the process of putting the hopper movable plug 6e back to the discharge port by the movable plug operating rod 6i, the hopper movable plug 6e will gradually change from a vertical state to a horizontal state again; the above operation process is simple, convenient and efficient; the added pull ring 6j facilitates manual or mechanical operation.

[0089] In addition, in this embodiment, the prepared grout slurry is poured into the transparent bleeding test cylinder body, and the bleeding test cylinder body cover is covered. Then, compressed air is introduced through the quick connector for compressed air, so that the bleeding test of the grout slurry can be completed on site, with simple, convenient and fast operation. The initial liquid level height a1 of the grout slurry is collected by the image acquisition device. After standing for 10 minutes, the compressed air valve is opened, and the pressure is quickly increased to the test pressure through the quick connector for compressed air. After pressurizing for 5 minutes, the bleeding water surface height a2 and the cement slurry surface height a3 after pressurization are collected by the image acquisition device. In this way, the pressure bleeding rate can be accurately calculated. Since the whole process does not require human eye recognition, the error is greatly reduced and the test accuracy is improved. The added bleeding test gasket improves the sealing performance of the bleeding test, thus further improving the test accuracy.

[0090] Finally, this equipment can also realize the on-site preparation of grout. The quality of each component material can be controlled throughout the process, completely eliminating the phenomenon of fraud and ensuring that each preparation of grout fully meets the standards. Compared with the existing method of preparing and packaging grout for transportation, it avoids the grout from getting wet and deteriorating during transportation, and also avoids the grout from deteriorating due to environmental reasons and storage time during storage. It also avoids environmental pollution and labor losses caused by secondary packaging and multiple handling. The horizontal sealed stirring barrel structure enables a small amount of cleaning water to agitate at high speed without dead corners in the barrel, ensuring that every part of the barrel can be cleaned thoroughly, greatly reducing the cleaning water volume and time, and at the same time, well avoiding the adverse effects caused by the incomplete cleaning of the upper part of the vertical stirring barrel, which may lead to the continuous adhesion, accumulation and solidification of the grout slurry on the inner wall of the barrel.

Claims

1. A slurry making device for prestressed duct grouting material with measurable fluidity, comprising a mixing barrel (1), a mixing paddle (2) and a driving mechanism (3) that cooperate with each other, characterized in that, The stirring barrel (1) is of a sealed structure. The stirring paddle (2) is rotatably installed in the stirring barrel (1) at a high speed. The driving mechanism (3) is used to drive the stirring paddle (2) to rotate at a high speed and measure the fluidity of the slurry. It further includes a quick-connect component (5). The quick-connect component (5) is used for the quick installation and disassembly of the stirring barrel (1). The quick-connect component (5) includes a connecting plate (5a) provided at the mouth of the stirring barrel (1) and an end cover (5b) that cooperates with the connecting plate (5a). The end cover (5b) is hermetically connected to the connecting plate (5a). A movable joint locking ring (5c) that can be circumferentially positioned and rotated is sleeved on the outer wall of the end cover (5b). An internal thread is provided on one side of the inner wall of the movable joint locking ring (5c) facing the connecting plate (5a). An external thread that cooperates with the internal thread is provided on the outer wall of the connecting plate (5a). A plurality of sliding positioning beads (5e) are installed on the inner wall of the movable joint locking ring (5c) along the circumferential direction through elastic members (5d). A sliding positioning groove (5f) is provided on the outer wall of the end cover (5b) along the circumferential direction corresponding to the position of the sliding positioning beads (5e). A pair of mating docking positioning holes (5g) and docking positioning posts (5h) are provided between the end cover (5b) and the connecting plate (5a). The docking positioning holes (5g) are provided on the end cover (5b) or the connecting plate (5a), and the corresponding docking positioning posts (5h) are provided on the connecting plate (5a) or the end cover (5b).

2. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 1, characterized in that, The stirring barrel (1) is of a horizontal structure, and the rotation speed of the stirring paddle (2) is greater than or equal to 400 rpm.

3. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 1, characterized in that, The ratio of the rotation diameter of the paddle blades of the stirring paddle (2) to the inner diameter of the stirring barrel (1) is greater than or equal to 0.7 and less than 1. The ratio of the effective action width of the paddle blades of the stirring paddle (2) to the net length of the stirring barrel (1) is 0.2 - 0.

8.

4. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 1, characterized in that, The stirring paddle (2) includes a stirring shaft (2a). Along the axial direction of the stirring shaft (2a), at least one group of paddle blades (2b) is provided. Each group of paddle blades (2b) includes at least one paddle blade (2b) arranged along the circumferential direction of the stirring shaft (2a). The range of the axial angle α of the paddle blades (2b) is 15 - 80°.

5. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 4, characterized in that, When at least two groups of paddle blades (2b) are provided along the axial direction of the stirring shaft (2a), the arrangement directions of the axial angles α of the adjacent two groups of paddle blades (2b) are opposite.

6. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 1, characterized in that, The driving mechanism (3) includes a driving motor (3a) for driving the stirring paddle (2) to rotate and a measuring element for measuring the current and / or power of the driving motor (3a). The measuring element is connected to the driving motor (3a).

7. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 6, characterized in that, The driving mechanism (3) further includes a first connecting cylinder (3b). The output shaft end of the driving motor (3a) is inserted into the first connecting cylinder (3b).

8. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 7, characterized in that, The output shaft of the driving motor (3a) is located inside the first connecting cylinder (3b), and a coupling (3c) for connecting the stirring shaft (2a) of the stirring paddle (2) is installed on the output shaft of the driving motor (3a).

9. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 8, characterized in that, It further includes a second connecting cylinder (3d), the second connecting cylinder (3d) is coaxially connected to the first connecting cylinder (3b), and the second connecting cylinder (3d) and the driving motor (3a) are respectively arranged at two ends of the first connecting cylinder (3b).

10. The slurry making device for prestressed duct grouting material with measurable fluidity according to claim 9, characterized in that, A bearing seat (3e) is provided on the inner wall of the second connecting cylinder (3d), a bearing (3f) that cooperates with the stirring shaft (2a) of the stirring paddle (2) is installed in the bearing seat (3e), the number of the bearing seats (3e) is two, the two bearing seats (3e) are respectively arranged on the inner walls at two ends of the second connecting cylinder (3d), and the number of the bearings (3f) correspondingly is also two.

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