Pumping device for fresh mortar or fresh concrete

Abstract

To solve the problem that it is difficult to pressure-feed fresh fiber reinforcement mortar by a pump using a pressure-feed pipe.SOLUTION: An agitation pressure-feed pipe is arranged on the downstream side of a taper pipe of a pump for feeding fresh mortar and includes a pipe body and an agitation part, wherein the pipe body includes a first connection part arranged on its upstream side and a second connection part arranged on its downstream side, and the agitation part is stored in the pipe body. The agitation part includes a rotary shaft and a pin-shaped agitation branch erected on the rotary shaft. The agitation part is detachable from the pipe body.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an improvement in a pumping device for fresh mortar or fresh concrete. Here, fresh mortar refers to a fluid mortar material (a composition having a basic formulation of cement + sand + water) before hardening, and fresh concrete refers to a fluid concrete material (a composition having a basic formulation of cement + sand + water + aggregate) before hardening. Note that fresh mortar and fresh concrete may contain reinforcing fibers.

Background Art

[0002] In order to prevent the occurrence of cracks on the surface of a concrete structure (such as the back surface of a pier), the surface is coated with so-called fiber-reinforced mortar. This fiber-reinforced mortar is obtained by mixing reinforcing fibers made of polyamide wire, steel wire, or the like into the mortar. Generally, since the fluidity of so-called fresh fiber-reinforced mortar before hardening is low, it has been applied and laminated by hand to the surface of the concrete structure to be repaired. Recently, fiber-reinforced mortar that can be pumped by a pump has been proposed. By using such fiber-reinforced mortar, the surface of the concrete structure to be repaired can be mechanically coated. That is, a frame is arranged facing the surface, and fresh fiber-reinforced mortar is poured between the surface and the frame. Refer to Patent Documents 1 and 2 as prior art documents disclosing technologies related to the present invention.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Such fresh fiber-reinforced mortar is said to be pumpable using a general-purpose pumping pipe by a pump. However, in reality, it was difficult to pump this using a pumping pipe, and the pump was under a high load for pumping. According to the study by the present inventors, the cause is the high viscosity of the fresh fiber-reinforced mortar.

[0005] The fresh fiber-reinforced mortar discharged from the pump is sent to the pumping pipe side through a tapered pipe connected to the discharge port of the pump. The tapered pipe has a large-diameter portion connectable to the discharge port of the pump and a small-diameter portion connectable to the pumping pipe or the like, and is a cylindrical member whose diameter gradually decreases from the large-diameter portion to the small-diameter portion. When the highly viscous fresh fiber-reinforced mortar discharged from the pump passes through such a tapered pipe, it may be compressed, and the pumping resistance may unexpectedly increase greatly. This is because in the tapered pipe, as the fresh fiber-reinforced mortar is gradually compressed, a mass (a region where the viscosity becomes abnormally high) is formed. As the cause, it is considered that when the fresh fiber-reinforced mortar is gradually compressed in the tapered pipe, the moisture contained in the fresh fiber-reinforced mortar is separated. Generalizing this, there is a possibility that water separation occurs in the tapered pipe even in fresh mortar (not containing reinforcing fibers) or fresh concrete.

[0006] Furthermore, according to the study by the present inventors, it was very difficult to pump the fresh fiber-reinforced mortar over a long distance. This is because when the pumping distance reaches about 50 to 100 m, a mass (rod-shaped mass) of fiber-reinforced mortar is generated at almost the center position inside the pumping pipe, and this mass becomes a large resistance.

Means for Solving the Problem

[0007] This invention was made to solve the above problems, and its first aspect is defined as follows. That is, A stirring and pumping pipe disposed on the downstream side of a tapered pipe of a pump for pumping fresh mortar or fresh concrete, It includes a pipe body and a stirring part, The pipe body includes a first connection part arranged on its upstream side and a second connection part arranged on its downstream side, A stirring and pressure - feeding pipe in which the stirring part is built into the pipe body.

[0008] According to the stirring and pressure - feeding pipe of the first aspect defined in this way, the fresh mortar or fresh concrete discharged from the pump and passing through the tapered pipe is introduced into the pipe body from the first connection part, where it is stirred by the stirring part. Thereby, the water separated from the fresh mortar or fresh concrete when passing through the tapered pipe is dispersed again, and the lumps in the case of fiber - reinforced mortar are also broken and disappear. That is, the original characteristics of the fresh mortar or fresh concrete before passing through the tapered pipe are restored.

[0009] The second aspect of this invention is defined as follows. That is, The stirring and pressure - feeding pipe of the first aspect, wherein the stirring part includes a rotating shaft and pin - shaped stirring branches erected on the rotating shaft. According to the stirring and pressure - feeding pipe of the second aspect defined in this way, since the stirring branches erected on the rotating shaft of the stirring part are pin - shaped, the resistance to the fresh mortar or fresh concrete being pressure - fed can be made as small as possible. Also, even if lumps of fiber - reinforced mortar occur, by adopting pin - shaped stirring branches, the power required to rotate the stirring part becomes small, so the motor of the rotating shaft can be miniaturized.

[0010] The rotating shaft is rotated by a motor attached outside the pipe body. Its rotation speed can be arbitrarily set by the control unit (the eighth aspect). Thereby, an optimal rotation speed, that is, a stirring state can be ensured according to the characteristics of the object to be pressure - fed. A steel pipe can be adopted for the rotating shaft. Although the cross - sectional shape of the rotating shaft is arbitrary, it is preferably circular because the resistance in the rotating direction (circumferential direction) becomes small. The central axis of the rotating shaft is preferably made to coincide with the central axis of the pipe body (the third aspect). This is for performing stirring evenly inside the pipe body.

[0011] The stirring blades are made of steel, and their cross-sectional shapes are arbitrary. The method of fixing the stirring blades to the rotating shaft is also arbitrary. For example, the end of the blade is brought into contact with the rotating shaft, or the stirring blade is passed through the rotating shaft, and the two are welded on the circumferential surface of the rotating shaft. The arrangement pattern of the stirring blades in the circumferential direction with respect to the rotating shaft is arbitrary. For example, the stirring blades can be arranged on the same cross-section of the stirring shaft, or the stirring blades can be arranged so as to form a helix on the circumferential surface of the stirring shaft. The circumferential pitch of the stirring blades with respect to the rotating shaft (the interval between the stirring blades when viewed from the axial direction of the rotating shaft) is also arbitrary. For example, they can be arranged at the same pitch, or they can be arranged at different pitches. When arranged at the same pitch, it is preferably at intervals of 90 degrees to 180 degrees.

[0012] The pitch of the stirring blades in the axial direction with respect to the rotating shaft is arbitrarily selected according to the arrangement density in the circumferential direction. For example, it can be 3 to 20% of the length of the pipe body. The length of the stirring blade is preferably such that the orbital radius of its tip is 50 to 95% of the inner diameter of the pipe body. By setting the relationship between the two to 95% or less, it is possible to surely eliminate the separation of water contained in the fresh mortar or fresh concrete while preventing interference with the pipe body, and also to make the lumps disappear. Also, by setting the relationship between the two to 50% or more, it is possible to surely prevent the generation of lumps of fresh mortar or fresh concrete. All the stirring blades may have the same length, or stirring blades of different lengths may be adopted.

[0013] The stirring part is preferably detachable from the pipe body. By removing the stirring part from the pipe body, the inside can be efficiently washed with water after the pumping operation is completed. The shaft of the stirring part is rotatably supported (axially supported) by the lid closing both ends of the pipe body (the fifth aspect). In order to make the stirring part detachable from the pipe body, at least one of the lids at the ends of the pipe body is detachable from the pipe body.

[0014] If a lid for closing the end of the pipe body is provided with a connection part to a tapered pipe or a pressure-feeding pipe, the structure for supporting the shaft of the stirring part is restricted, which also requires a large diameter for the lid and, consequently, a large diameter for the pipe body. Therefore, in the present invention, in order to avoid interference with the stirring part, either one, preferably both, of the connection parts (the first connection part and the second connection part) to other pipes (tapered pipes or pressure-feeding pipes) are provided on the side surface of the pipe body (the fourth aspect). The first connection part and the second connection part are preferably provided inclined with respect to the side surface of the pipe body. The angle of inclination is not particularly limited, but it is preferably arranged so that an included angle of 30 to 80 degrees is formed with respect to the central axis of the pipe body (the pressure-feeding direction of the mortar). The direction of inclination shall follow the flow direction of the object to be pressure-fed. In other words, the flow direction of the object to be pressure-fed in the first connection part on the upstream side with respect to the flow direction of the object to be pressure-fed in the pipe body is in the same direction through the aforementioned inclination angle, and the flow direction of the object to be pressure-fed in the second connection part on the downstream side is also in the same direction as the flow direction of the object to be pressure-fed in the pipe body through the aforementioned inclination angle. The first connection part and the second connection part are preferably provided at positions as far apart as possible in the pipe body.

[0015] Raw mortar refers to mortar material before hardening (a composition with cement + sand + water as the basic formulation). Reinforcing fibers can also be mixed in the mortar material. The raw mortar mixed with reinforcing fibers is referred to as raw fiber-reinforced mortar in this specification. Raw concrete refers to a fluid concrete material before hardening (a composition with cement + sand + water + aggregate as the basic formulation). Reinforcing fibers can also be mixed in the concrete material.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

DETAILED DESCRIPTION OF THE INVENTION

[0017] FIG. 1 shows the pumping system 1 of the embodiment. This pumping system 1 is formed by sequentially connecting a pump 2, a tapered pipe 3, a first stirring feed pipe 4, a first feed pipe 5, a second stirring feed pipe 4a, and a second feed pipe 6. This pumping system 1 pumps the fresh fiber-reinforced mortar to the placing location. Here, when the placing location is close (for example, the distance from the pump 2 is 50 m or less), if the second feed pipe 6 becomes unnecessary, the second stirring feed pipe 4a between the second feed pipe 6 and the first feed pipe 5 also becomes unnecessary. In the pumping system 1, general-purpose products can be used for the pump 2, the tapered pipe 3, the first feed pipe 5, and the second feed pipe 6. The first stirring feed pipe 4 and the second stirring feed pipe 4a may have the same specifications or different specifications. The stirring speeds in the first stirring feed pipe 4 and the second stirring feed pipe 4a are independently controlled.

[0018] The first stirring feed pipe 4 includes a pipe body 10, a stirring section 30, and a stirring drive section 60. The pipe body 10 is made of a cylindrical steel pipe with a circular cross-section (see FIG. 5). A first connection portion 11 is provided at one end side of the side surface (circumferential surface) of the pipe body 10, and a second connection portion 12 is provided at the other end side. The first connection portion 11 is arranged on the upstream side in the pumping direction, and the second connection portion 12 is arranged on the downstream side.

[0019] The diameters of the openings of the first connection portion 11 and the second connection portion 12 are standardized, and are respectively connected in a liquid-tight manner to the small-diameter portion of the tapered pipe 3 and the end portion of the feed pipe by mechanical fasteners such as clamps via a sealing member such as an O-ring. The first connection part 11 and the second connection part 12 are arranged inclined with respect to the central axis of the pipe body 10. In this example, the first connection part 11 is arranged at an included angle of 60 degrees with respect to the central axis of the pipe body 10, and is directed towards one end side of the pipe body 10 (the left side in the figure, the downstream side in the flow direction of the green fiber reinforced mortar), and the second connection part 12 is also arranged at an included angle of 60 degrees with respect to the central axis of the pipe body 10 and is directed towards the other end side of the pipe body 10 (the drive part 60 side, the upstream side in the flow direction of the green fiber reinforced mortar). The included angles of the first connection part 11 and the second connection part 12 do not have to be the same. In this example, the first connection part 11 and the second connection part 12 are arranged at intervals of 180 degrees in the circumferential direction on the side surface of the pipe body 10, but the circumferential interval on the side surface of the pipe body 10 can be designed arbitrarily.

[0020] Reference numeral 13 in FIG. 2 is a pressure gauge, which displays the pressure inside the pipe body 10. Pressure gauges for measuring the internal pressure can also be arranged at the first connection part 11 and the second connection part 12. The base end of the pipe body 10 is covered by the first lid part 15, and the tip end side thereof is covered by the second lid part 16. O-rings are interposed between each end of the pipe body 10 and the first lid part 15 and the second lid part 16, and they are fastened by clamps 17, 18.

[0021] The stirring part 30 includes a rotating shaft 31 and stirring branches 33. The rotating shaft 31 is made of a round steel pipe and is pivotally supported by the first lid part 15 and the second lid part 16. The central axis of the rotating shaft 31 coincides with the central axis of the pipe body 10. This is to make the stirring uniform. One end of the rotating shaft 31 penetrates through the first lid part 15, and a gear 20 is provided at the penetrated part. A motor 25 drive gear described later meshes with this gear 20, and the rotational driving force of the motor 25 is transmitted to the rotating shaft 31. The stirring drive part 60 is constituted by the gear 20 and the motor 25. The rotation speed etc. of the motor 25 are controlled by the control part 70 (see FIG. 6). The control part 70 is provided with a power supply unit for the motor 25 and a rotation control unit.

[0022] The stirring rod 33 is a round bar made of steel and penetrates the rotating shaft 31. On the side surface of the rotating shaft 31, it is welded to the stirring rod 33. Since the stirring rod 33 penetrates the rotating shaft 31, when the rotating shaft 31 is viewed from the axial direction, the two stirring rods 33 are provided so as to project with an interval of 180 degrees (see Fig. 5). By passing the stirring rod 33 through the rotating shaft 31, high mechanical rigidity is imparted to the stirring rod 33.

[0023] In this example, the stirring rods 33 are arranged at equal pitches in the axial direction of the rotating shaft 31. The pitch of the stirring rods 33 in the axial direction can be arbitrarily set. In this example, for the pipe body 10 with a length of 1000 mm, the axial pitch of the stirring rods 33 is set to 50 mm. Also, the length of the stirring rod 33 is such that the diameter of the circle drawn by its tip is 120 mm, and the clearance from the inner diameter of the pipe body 10 is about 10 mm. Note that the stirring rod 33 uses a rod-shaped steel material with a diameter of 9 mm. On the peripheral wall of the pipe body 10, the distance between the center of the first connection part 11 and the center of the second connection part 12 is 800 mm.

[0024] The tip of the rotating shaft 31 (the right end in the figure) is detachably connected to a bearing 36 provided at the center of the second lid part 16. For example, a key is provided at the tip of the bearing 36, and a key groove is provided on the tip side of the rotating shaft 31 to restrict the circumferential movement of both, while allowing the axial movement of both to be free. The other end of the rotating shaft 31 is also detachably connected to a bearing 35 provided at the center of the first lid part 15. This bearing 35 is connected to the gear 20 and rotates as the gear 20 rotates.

[0025] An example of applying the above-described first stirring and pumping pipe 4 to the pumping system 1 and pumping fresh fiber-reinforced mortar (Slim Crete (registered trademark)) will be described. Each element constituting the pumping system 1 is as follows. Note that the first stirring and pumping pipe 4 and the second stirring and pumping pipe 4a have the same structure. Discharge pressure of the pump 2: 10.7 Mpa Length of the tapered pipe 3: 1.5 m to 2.0 m Diameter of the large-diameter part of the tapered pipe 3: 2.5B (65A), diameter of the small-diameter part: 2B (50A) Rotation speed of the first stirring and pumping pipe 4: 5 - 30 rpm Length of the first pumping pipe 5: 20 - 100 m Rotation speed of the second stirring and pumping pipe 4a: 5 - 30 rpm Length of the second pumping pipe 6: 20 - 60 m Thus, according to the pumping system 1, the fresh fiber-reinforced mortar can be mechanically pumped up to 160 m away. In the pumping system of FIG. 1, either one of the first stirring and pumping pipe 4 and the second stirring and pumping pipe 4a can be omitted. It can be arbitrarily selected according to the pumping target, pumping distance, temperature conditions, etc.

[0026] Generalizing the above example, the pumping method of fresh mortar or fresh concrete can be defined as follows. Pipe body In a pumping system formed by sequentially connecting a pump, a tapered pipe, a stirring and pumping pipe, and a first pumping pipe, the stirring and pumping pipe includes a pipe body and a stirring part, the pipe body includes a first connection part connected to the upstream side of the flow of the pumping target and a second connection part connected to the downstream side, and the first connection part and the second connection part are attached to the side surface of the pipe body, the stirring part includes a rotating shaft detachably attached to the pipe body and pin-shaped stirring branches erected on the rotating shaft. A pumping method using the pumping system, when the pumping target is fresh mortar containing reinforcing fibers, the inner diameter of the pipe body is 50 - 250 mm, the outer peripheral diameter of the stirring branches is 3 - 20% of the inner diameter of the pipe body in length, the distance between the first connection part and the second connection part is 30 - 100 mm, the rotation speed of the rotating shaft is 5 - 30 rpm, A pumping method for fresh mortar or fresh concrete. Disclose the following matters. (1) A stirring and pumping pipe disposed on the downstream side of a tapered pipe of a pump for sending fresh mortar or fresh concrete, comprising a pipe body and a stirring part, wherein the pipe body includes a first connection part disposed on its upstream side and a second connection part disposed on its downstream side, a stirring and pumping pipe with the stirring part built in the pipe body. (2) The stirring and pumping pipe according to (1), wherein the stirring part includes a rotating shaft and pin-shaped stirring branches erected on the rotating shaft. (3) The stirring and pumping pipe according to (2), wherein the axis of the rotating shaft coincides with the central axis of the pipe body. (4) The stirring and pumping pipe according to (2), wherein the first connection part and / or the second connection part is formed on the side surface of the pipe body. (5) The stirring and pumping pipe according to (4), wherein the lid at at least one end of the pipe body is detachable from the pipe body, and the shaft of the stirring part is rotatably supported by the lid. (6) The first connection part and the second connection part are attached to the side surface of the pipe body, The stirring and pumping pipe according to (2), wherein the stirring part can be detachably inserted from the end side of the pipe body. (7) The stirring and pumping pipe according to (6), wherein the first connection part and the second connection part are arranged inclined with respect to the central axis of the pipe body. (8) The stirring and pumping pipe according to claim 1, further comprising a control part for controlling the stirring speed of the stirring part. (9) A stirring part used for a stirring and pumping pipe, comprising a rotating shaft detachably attached to the pipe body of the stirring and pumping pipe and pin-shaped stirring branches erected on the rotating shaft. (10) A pipe body used for a stirring and pumping pipe, A pipe body having a first connection portion connected to the upstream side and a second connection portion connected to the downstream side, wherein the first connection portion and the second connection portion are attached to the side surface of the pipe body. (11) A pumping system for fresh mortar or fresh concrete, A pumping system in which a pump, a tapered pipe, and the first stirring and pumping pipe according to any one of (1) to (8) are sequentially connected. (12) A pumping system for fresh mortar or fresh concrete, A pump, a tapered pipe, and the first stirring and pumping pipe according to any one of (1) to (8) are sequentially connected, An upstream end of a first pumping pipe is connected to the second connection portion of the first stirring and pumping pipe, and a first connection portion of the second stirring and pumping pipe according to any one of claims 1 to 8 is connected to a downstream end of the first pumping pipe. A pumping system. (13) An upstream end of a second pumping pipe is connected to the second connection portion of the second stirring and pumping pipe. The pumping system according to (12).

Explanation of Reference Numerals

[0027] 1 Pumping system 2 Pump 3 Tapered pipe 4, 4a Stirring and pumping pipe 5, 6 Pumping pipe 10 Pipe body 11 First connection portion 12 Second connection portion 15, 16 Cover portion 20 Gear 25 Motor 30 Stirring portion 31 Rotating shaft 33 Stirring blade

Claims

1. A pump for pumping fresh mortar or fresh concrete, a tapered pipe connected to the pump, a stirring and pumping pipe arranged on the downstream side of the tapered pipe, and a pumping pipe arranged on the downstream side of the stirring and pumping pipe, comprising: the stirring and pumping pipe includes a pipe body and a stirring part, the pipe body is provided with a first connection part arranged on its upstream side for receiving the mortar or fresh concrete from the tapered pipe, and a second connection part arranged on its downstream side for sending the fresh mortar or fresh concrete to the pumping pipe, the stirring part is built into the pipe body, the stirring part includes a rotating shaft and pin-shaped stirring branches erected on the rotating shaft, in a pumping system where there is no stirring part in the pumping pipe, a pumping system, wherein the first connection part and / or the second connection part is formed on the side surface of the pipe body.

2. A pump for pumping fresh mortar or fresh concrete, a tapered pipe connected to the pump, a stirring and pumping pipe arranged on the downstream side of the tapered pipe, and a pumping pipe arranged on the downstream side of the stirring and pumping pipe, comprising: the stirring and pumping pipe includes a pipe body and a stirring part, the pipe body is provided with a first connection part arranged on its upstream side for receiving the mortar or fresh concrete from the tapered pipe, and a second connection part arranged on its downstream side for sending the fresh mortar or fresh concrete to the pumping pipe, the stirring part is built into the pipe body, the stirring part includes a rotating shaft and pin-shaped stirring branches erected on the rotating shaft, in a pumping system where there is no stirring part in the pumping pipe, a pumping system, wherein the pin-shaped stirring branches penetrate the rotating shaft, and the length of the stirring branches is such that the orbital radius of their tips is 50 - 95% of the inner diameter of the pipe body.

3. A pump for pumping fresh mortar or fresh concrete, a stirring and pumping pipe arranged on the downstream side of the pump, and a pumping pipe arranged on the downstream side of the stirring and pumping pipe, comprising: the stirring and pumping pipe includes a pipe body and a stirring part, the pipe body is provided with a first connection part arranged on its upstream side for receiving the mortar or fresh concrete from the pump, and a second connection part arranged on its downstream side for sending the fresh mortar or fresh concrete to the pumping pipe, the stirring part is built into the pipe body, in a pumping system where there is no stirring part in the pumping pipe, a pumping system, wherein the first connection part and / or the second connection part is formed on the side surface of the pipe body.

4. The pressure pump system according to claim 3, wherein a pressure gauge is further provided in the pipe body.

5. The pressure pump system according to claim 3, wherein the length of the first pressure pipe is 20 to 100 m.

6. The pressure pump system according to claim 3, wherein the pin-shaped stirring branch penetrates the rotating shaft, and the length of the stirring branch is such that the orbital radius of its tip is 50 to 95% of the inner diameter of the pipe body.

7. The pressure pump system according to claim 3, wherein the lid at at least one end of the pipe body is detachable from the pipe body, and the shaft of the stirring part is rotatably supported by the lid.

8. The pressure pump system according to claim 3, wherein the stirring part can be detachably inserted from the end side of the pipe body.

9. The pressure pump system according to claim 3, wherein the first connection part and the second connection part are arranged obliquely with respect to the central axis of the pipe body.

10. The pressure pump system according to claim 3, further comprising a control part for controlling the stirring speed of the stirring part.

11. A pump for pumping fresh mortar or fresh concrete, A stirring pressure pipe, A first pressure pipe arranged between the stirring pressure pipe and the pump, and comprising: The stirring pressure pipe includes a pipe body and a stirring part, The pipe body is provided with a first connection part arranged on its upstream side and connected to the first pressure pipe, and a second connection part arranged on its downstream side for sending the fresh mortar or the fresh concrete to a second pressure pipe. The stirring part is built into the pipe body, In a pressure pump system, the stirring part does not exist in the first pressure pipe and the second pressure pipe. A pressure pump system, wherein the first connection part and / or the second connection part is formed on the side surface of the pipe body.

12. A stirring pressure pipe arranged on the downstream side of a pump for pumping fresh mortar or fresh concrete, and connected to a pressure pipe without a stirring part. The stirring pressure pipe comprises: A pipe body and a stirring part, The pipe body is provided with a first connection part arranged on its upstream side for receiving the mortar or the fresh concrete from the pump, and a second connection part arranged on its downstream side for sending the fresh mortar or the fresh concrete to the pressure pipe. The stirring part is built into the pipe body, The first connection part and / or the second connection part is formed on the side surface of the pipe body. Stirring pressure pipe.

13. A stirring pressure pipe arranged on the downstream side of a pump for pumping fresh mortar or fresh concrete, Comprising a pipe body and a stirring part, The pipe body is provided with a first connection portion disposed on its upstream side to receive the mortar and the fresh concrete from the pump, and a second connection portion disposed on its downstream side to send out the fresh mortar and the fresh concrete to the pressure delivery pipe. The stirring portion is built into the pipe body. The stirring portion includes a rotating shaft and pin-shaped stirring branches erected on the rotating shaft. The pin-shaped stirring branches penetrate the rotating shaft, and the length of the stirring branches is such that the orbital radius of their tips is 50 to 95% of the inner diameter of the pipe body, which is a stirring and pressure delivery pipe.

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