JP2003074486A - Conveying pump with hopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveying pump with a hopper, capable of keeping high the capability of conveying conveyed material having high concentration, high viscosity and a little flowability such as freshly mixed concrete and economical. SOLUTION: This conveying pump with a hopper is provided with a pump part 18 having an impeller 16 in which a rotating shaft 14 is horizontally disposed and the rotating shaft 14 is driven by a motor 15 and a casing 17 for it, a pushing means 13 provided on an extended part of the rotating shaft 14 for pushing the conveyed material 11 having viscosity and flowability into the pump part 18, a bearing 26 for supporting the tip of the extended part 24 of the rotating shaft 14 to be freely rotated, and an input hopper 12 disposed right above the pushing means 13 and storing the conveyed material 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer pump with a hopper for transferring a high-concentration, high-viscosity, but somewhat fluid, material such as fresh concrete.

[0002]

2. Description of the Related Art Conventionally, a plunger pump has been used as a pump for carrying a high-concentration, high-viscosity, but somewhat fluid, material such as ready-mixed concrete. As an example of a method for transporting ready-mixed concrete, this pump is connected to the outlet of the ready-mixed concrete at the bottom of the charging hopper that stores the ready-mixed concrete, and it is transported through the discharge pipe.

[0003]

However, the above-mentioned transfer pump still has the following problems to be solved. Since the structure of the pump is a plunger type, there is a problem that the transfer capacity is small. In addition, especially when the water content of the ready-mixed concrete is low and the fluidity is poor, the ready-mixed concrete is difficult to be sucked by the pump, and as a result, the carrying capacity is further reduced. Therefore, in order to maintain the predetermined carrying capacity, a large capacity is required. It was uneconomical to install a pump.

The present invention has been made in view of such circumstances, and it is possible to maintain a high carrying capacity of a conveyed product such as ready-mixed concrete having a high concentration and a high viscosity, but having a slight fluidity, and
It is an object to provide an economical transfer pump with a hopper.

[0005]

A transport pump with a hopper according to the present invention, which has the above-mentioned object, has a pump section having an impeller in which a rotary shaft is arranged horizontally and the rotary shaft is driven by a motor, and a casing thereof. A push-in means provided on the extension of the rotary shaft for pushing a viscous and fluidized material into the pump, a bearing for rotatably supporting the tip of the extension of the rotary shaft, and a bearing just above the push-in means. And a loading hopper that stores the transported material. As a result, it is possible to directly push the conveyed product in the loading hopper into the pump portion by the pushing means provided in the extension portion of the rotary shaft that rotationally drives the impeller.

In the hopper-equipped transfer pump according to the present invention, the pushing means may be constituted by a screw blade having a twist angle of 5 to 30 °. by this,
With the screw blade, it is possible to reliably push even a densely-conveyed material (having a large amount of solid content) of low fluidity into the pump section. If the twist angle is less than 5 °, the transfer speed is slow, so
The transport efficiency is poor, and when the twist angle exceeds 30 °, the pushing pressure decreases. In the transport pump with hopper according to the present invention, the pushing means has a twist angle of 30 to 70.
It can also be configured with a multi-row feed blade of °. As a result, both the transfer speed and the pushing pressure of the conveyed article to the pump section are improved by the multi-row feed blade, so that a larger concentration of conveyed article having less fluidity can be pushed into the pump section. If the twist angle is less than 30 °, the transport efficiency is poor, while if the twist angle exceeds 70 °, the pushing pressure is reduced.

In the hopper-equipped transfer pump according to the present invention, the pushing means may be configured to include a spiral blade having a hollow portion formed at the center and a twist angle of 5 to 30 °. As a result, it is possible to more uniformly stir and mix the conveyed product, which is easily separated from water, and to reliably push the conveyed product into the pump portion by the spiral blade. If the twist angle is less than 5 °, the transport efficiency is poor, while the twist angle is 3
If the angle exceeds 0 °, the pushability will be reduced. In the hopper-equipped transfer pump according to the present invention, a compressed air blowing nozzle capable of blowing compressed air along the discharge direction of the conveyed product may be attached to the discharge pipe on the outlet side of the pump portion at an acute angle to the discharge pipe. it can. As a result, it is possible to increase the carrying capacity of the carried product in the discharge pipe. In the hopper-equipped transfer pump according to the present invention, the discharge pipe on the outlet side of the pump unit is provided with an atmosphere inflow pipe at an acute angle with respect to the discharge pipe along the discharge direction of the conveyed product, and further, in communication with the discharge pipe. A vacuum tank connected to a vacuum pump may be connected to the end of the extended transportation pipe. As a result, even if the transported material has a high concentration and low fluidity, it is continuously quantitatively supplied to the atmosphere inflow pipe by the pump, and thereafter,
Since the air can be transported by being carried on the air flow sucked from the atmosphere inflow pipe to the vacuum tank, the long-distance transportation can be performed more efficiently.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to the attached drawings, an embodiment in which the present invention is embodied will be described to provide an understanding of the present invention. 1 is a front sectional view of a transfer pump with a hopper according to an embodiment of the present invention, FIG. 2 is a front sectional view of a transfer pump with a hopper according to another embodiment of the present invention, and FIG. It is a fragmentary front sectional view of a modification of the pushing means of the transfer pump with a hopper which concerns on one embodiment of the invention.

As shown in FIG. 1, a hopper-equipped transport pump 10 according to an embodiment of the present invention has a raw concrete 11 which is an example of a transported product having a high concentration and a high viscosity but a little fluidity. Input hopper 12 to be stored and input hopper 1
2, a screw blade 13 that is an example of a pushing means of the raw concrete 11 provided at the bottom portion, and the raw concrete 11 is supplied through the screw blade 13, and a rotating shaft 14 that is arranged substantially horizontally in the central portion, It has an impeller 16 rotatably driven by a motor 15 and a pump unit 18 having a casing 17 thereof. These will be described in detail below.

Input hopper 12 for storing fresh concrete 11
Is provided with a storage section 20 having a charging port 19 formed at the upper end and a small cross-sectional area along the lower side, and a supply section 21 connected to the lower end of the storage section 20 and having a screw blade 13 built therein. . The raw concrete 11 in the storage section 20 sequentially descends into the supply unit 21 so as to replenish the raw concrete 11 supplied to the pump unit 18 by the rotation of the screw blades 13. The input hopper 12 is supported by the upper end of a support frame 23 fixed to the floor 22 at the lower end of the storage unit 20 and the side of the supply unit 21.

One end of the rotary shaft 14 is connected to the output shaft (not shown) of the motor 15, and the other end of the rotary shaft 14 is
The rotary shaft 14 is integrally attached to an extension shaft 24 which is an example of an extension of the rotary shaft 14. The screw blade 13 is provided at an intermediate position of the extension shaft 24, and the pump portion 18 of the extension shaft 24 is provided.
The other end of the rotary shaft 14 is integrally connected to the bearing side, and the tip end of the extension shaft 24 on the side opposite to the pump is connected to the bearing 2 via a bearing holding portion 25 provided inside the upper portion of the support frame 23.
It is rotatably supported by 6.

As shown in FIG. 1, in the screw blade 13, the winding angle β of the blade around the extension shaft 24, that is, the twist angle (lead angle) is 10 °. The wrapping angle β is determined in consideration of the fluidity that is affected by the water content of the ready-mixed concrete 11, the particle size of the solid content, the material of the screw blades 13 and the number of revolutions, and the transport amount. Angle β is 5 to 30 °
Is preferred. 1 pitch of screw blade 13 (lead)
Is L ₁ , the axial length N of the screw blade 13 is
₁ = (2.0 to 2.8) L ₁ , the opening length M ₁ of the lower end of the storage section 20 of the input hopper 12 = (1.1 to 1.5) L ₁
I am trying.

Therefore, by driving the motor 15 to rotate the screw blades 13, the raw concrete 11 in the vicinity of the screw blades 13 of the supply section 21 is pushed into the pump section 18 side and conveyed, and the conveyed raw concrete 11 minutes are conveyed. Are sequentially
The ready-mixed concrete 11 in the storage section 20 is dropped to the supply section 21 to be replenished.

The discharge pipe 28, which is flange-connected to the outlet side of the casing 17 of the pump portion 18 via a curved pipe 27,
A pipe-shaped compressed air blowing nozzle 30 capable of blowing compressed air into the discharge pipe 28 is obliquely provided along the discharge direction 29 of the ready-mixed concrete 11. Intersection angle α (about 10 to 30) between the compressed air blowing nozzle 30 and the discharge pipe 28.
°) is an acute angle. Moreover, the compressed air blowing nozzle 30 is communicatively connected to an air compressor via a compressed air pipe (not shown). Therefore, the motor 15
Drive the hopper 12 by driving the screw blades 13
Of the compressed air blowing nozzle by pushing the raw concrete 11 of the supply unit 21 into the pump unit 18 and discharging the raw concrete 11 in the casing 17 through the curved pipe 27 to the discharge pipe 28 at a speed by the rotation of the impeller 16. Three
It can be placed smoothly on the compressed air flow from 0,
Therefore, even if the ready-mixed concrete 11 has a low fluidity, and even if the pipeline is a long distance, it can be efficiently conveyed by the pressure-fed pneumatic transportation.

Next, a hopper-equipped transfer pump 40 according to another embodiment of the present invention shown in FIG. 2 will be described. The same components as those of the transfer pump with hopper 10 are designated by the same reference numerals, and detailed description thereof will be omitted. Compared to the hopper-equipped transfer pump 10, the hopper-equipped transfer pump 40 mainly includes a spiral blade 41 instead of the screw blade 13, and an atmosphere inflow pipe 30a instead of the compressed air blowing nozzle 30. It is characterized by the point.

Input hopper 12 for storing ready-mixed concrete 11
a is a storage portion 20a having a charging port 19a formed at the upper end and a cross-sectional area formed smaller along the lower side, and a storage portion 20a.
And a supply unit 21a that has a spiral blade 41 built therein. In the charging hopper 12a, the lower end of the storage section 20a is supported by the upper end of a support frame 23a fixed to the floor surface 22, and the inside of the upper part of the support frame 23a (on the pump section 18 side) is a part of the supply section 21a. Are configured.

On the pump portion 18 side of the spiral blade 41, a short extension shaft 24 which is an example of an extension portion of the rotary shaft 14 is provided.
a is coaxially attached to the rotary shaft 14, while a hollow portion 45 is formed in the center of the spiral blade 41 on the side opposite to the pump, and the blade twist angle θ is formed to be 15 °. The cross-sectional area of the hollow portion 45 when the hollow portion 45 is viewed in the axial direction of the extension shaft 24a is substantially the same as the cross-sectional area of the extension shaft 24a. The twist angle θ is determined by the transfer pump with hopper 1
Similar to 0, it is determined in consideration of the fluidity of the ready-mixed concrete 11 affected by water content, particle size, etc., the material of the spiral blade 41, the number of revolutions, etc., and the twist angle θ is preferably 5 to 30 °.

As shown in FIG. 2, assuming that one pitch (lead) of the spiral blade 41 is L ₂ , the spiral blade 4
1 has an axial length N ₂ = (2.0 to 2.8) L ₂ and an opening length M ₂ = at the lower end of the storage portion 20a of the charging hopper 12a.
(1.1 to 1.5) is set to L _2. The inner surface of the bottom of the supply portion 21a of the input hopper 12a has a structure in which a small gap is formed with the outer peripheral surface of the lower half of the spiral blade 41 as the spiral blade 41 rotates.

Therefore, in the transfer pump with hopper 40, since the hollow portion 45 is formed at the center of the spiral blade 41, compared with the transfer pump with hopper 10,
Even a conveyed product that is easily separated from water can be pushed into the pump unit 18 while being stirred, mixed, and homogenized.
Prevents blockage of the pump, etc., and discharge pipe 2 continuously and smoothly
8a can be discharged at a speed. further,
The discharge pipe 28a, which is flange-connected to the outlet side of the casing 17 of the pump portion 18 through the curved pipe 27, has a short atmospheric inflow pipe through which the atmosphere can flow into the discharge pipe 28a along the discharge direction 29 of the conveyed product. 30a is provided obliquely. Crossing angle γ between the air inlet pipe 30a and the discharge pipe 28a (about 45
-60 °) is an acute angle. Besides, this discharge pipe 2
The end of the transportation pipe which is connected to and extended from 8a is connected to a vacuum tank connected to a vacuum pump (not shown). Therefore, the motor 15 is driven to drive the spiral blade 4
1, the conveyed material that is easily separated from the water in the supply section 21a of the input hopper 12a is pushed into the pump section 18 while stirring and mixing, and the casing 17 is rotated by the rotation of the impeller 16.
By discharging the conveyed product through the curved pipe 27 to the discharge pipe 28a at a high speed, the air flow sucked from the atmosphere inflow pipe 30a to the vacuum tank can be smoothly placed, so that the fluidity can be improved. Even if the transported amount is small, and even if the pipeline is a long distance, it can be efficiently transported by suction type pneumatic transportation.

FIG. 3 shows a modification of the screw blades 13 of the transfer pump with hopper 10 according to the embodiment of the present invention. A two-row feed blade 42, which is a modified example of the pushing means and is an example of a multiple-feed blade, will be described. In addition,
The same components as those of the transfer pump with hopper 10 are designated by the same reference numerals, and detailed description thereof will be omitted.

One end of the rotary shaft 14 is connected to the output shaft (not shown) of the motor 15, and the other end of the rotary shaft 14 is
The rotary shaft 14 is integrally attached to an extension shaft 24b which is an example of an extension of the rotary shaft 14. The double feed blade 42 built in the supply part 21b is composed of a pair of spiral blade pieces 43 and 44,
It is provided at an intermediate position of the extension shaft 24b. Extension shaft 24
The other end of the rotary shaft 14 is integrally connected to the pump portion 18 side of b, and the tip end portion of the extension shaft 24b on the side opposite to the pump has a bearing holding portion 25a provided inside the upper portion of the support frame 23b. It is rotatably supported by the bearing 26a.

The spiral blade pieces 43 and 44 have a winding angle δ of the blade around the extension shaft 24b, that is, a twist angle (lead angle) of 5
The angle is 0 °, and it is 18 degrees facing the outer peripheral surface of the extension shaft 24b.
It is wrapped around 0 °. The winding angle δ is 1
It is determined in consideration of the fluidity affected by the water content and particle size of No. 1, the material of the spiral blade pieces 43 and 44, the number of revolutions, etc.
The winding angle δ is preferably 30 to 70 °. As shown in FIG. 3, when the (1/2) pitch (lead) of the spiral blade pieces 43 and 44 is L ₃ , the axial length N _{3 of} the spiral blade pieces 43 and 44 N = (1.0 to 1) .3) L ₃ , input hopper 12
the lower end opening length of b in reservoir 20b M ₃ = (0.4~
Is set to 0.7) L _3. In FIG. 3, L ₃
= N ₃ is represented. Therefore, the double feed blade 42
Since the wrap angle δ is large, both the transfer speed and the pushing pressure of the conveyed product are improved as compared with the screw blade 13, so that the conveyed product having less fluidity can be pushed into the pump portion more. Therefore, it is suitable when the pump discharge amount is relatively large.

Transport pump 1 with hopper of the above embodiment
Although the screw blade 13 and the double feed blade 42 are provided as the means for pushing 0, the invention is not limited to this, and the spiral blade 41 provided in the transfer pump 40 with a hopper may be provided. Although the spiral blade 41 is provided as the pushing means of the hopper-equipped transfer pump 40, the invention is not limited to this, and the screw blade 13 or the double feed blade 42 provided in the hopper-equipped transfer pump 10 may be provided depending on the situation. it can. In addition, the transfer pump with hopper 10, 40
Although the bearing is provided on the side opposite to the pump of the pushing means, it is not limited to this, and the bearing can be omitted by increasing the rigidity of the rotating shaft and the like.

As the multi-feed blade, the double-feed blade 42, that is, the spiral blade pieces 43 and 44 are used, but the invention is not limited to this, and it is also possible to provide three or more spiral blade pieces. Fresh concrete 11 was used as an example of a conveyed product having a high concentration and a high viscosity, but having some fluidity, but the present invention is not limited to this, and, for example, earth and sand, sludge, or the like can also be used. The ready-mixed concrete 11 having fluidity was introduced into the input hoppers 12, 12a, 12b and conveyed, but the present invention is not limited to this.
For example, dried cement, sand, gravel, or the like may be charged into the charging hoppers 12, 12a, and 12b, water may be added thereto, and the mixture may be stirred and mixed by a separate means to produce ready-mixed concrete. Although the compressed air blowing nozzle 30 is provided in the discharge pipe 28, the present invention is not limited to this.
When the transport distance is short, the compressed air blowing nozzle 30
Can be omitted. Further, although the air inlet pipe 30a is provided in the discharge pipe 28a, the present invention is not limited to this, and the air inlet pipe 30a may be omitted when the transport distance is short.

[0025]

In the carrier pump with hopper according to the first to sixth aspects of the present invention, the conveyed material in the feeding hopper is continuously pushed into the pump portion by the pushing means provided in the extension portion of the rotary shaft for rotationally driving the impeller. Therefore, it is possible to maintain the conveyance ability and convey even a conveyed product having a high concentration and a small fluidity. Moreover, since the structure of the pump is a rotary type, it is more economical than the conventional plunger type. Particularly, in the transport pump with hopper according to the second aspect, since a screw vane can surely push even a conveyed substance having a low fluidity and a high concentration into the pump portion, it has a particularly low water content and a high concentration (solid content). Suitable for transporting many items. In the transport pump with a hopper according to claim 3, since the multiple feed vanes improve both the transfer speed and the pushing pressure of the transported product to the pump part, more pumped parts with a high concentration and low fluidity are transported. Since it can be pushed into, it is particularly suitable when a relatively large pumping amount is required.

In the transport pump with hopper according to the fourth aspect, the spiral blade having the hollow portion can stir the transported material that is easily separated from water, and can surely push it into the pump portion while uniformly mixing, Since the pump can be prevented from being blocked and the discharge pipe can be discharged continuously and smoothly at a high speed, it is suitable for carrying a product that is easily separated from water. In the transfer pump with hopper according to the fifth aspect, since the compressed air blowing nozzle can increase the transfer ability of the transfer object in the discharge pipe, the transferability is improved. In the transfer pump with hopper according to the sixth aspect, the atmospheric inflow pipe can carry out a long distance more efficiently even for a conveyed product having a high concentration and a low fluidity, and thus has versatility. improves.

[Brief description of drawings]

FIG. 1 is a front sectional view of a transfer pump with a hopper according to an embodiment of the present invention.

FIG. 2 is a front sectional view of a transfer pump with a hopper according to another embodiment of the present invention.

FIG. 3 is a partial front sectional view of a modified example of the pushing means of the transfer pump with the hopper according to the embodiment of the present invention.

[Explanation of symbols]

10: Transport pump with hopper, 11: Ready-mixed concrete (transported product), 12, 12a, 12b: Input hopper, 13: Screw blade (pushing means), 14: Rotating shaft, 15:
Motor, 16: Impeller, 17: Casing, 18: Pump part, 19, 19a: Input port, 20, 20a, 20
b: storage part, 21, 21a, 21b: supply part, 22: floor surface, 23, 23a, 23b: support frame, 24, 24
a, 24b: extension shaft (extension part), 25, 25a: bearing holding part, 26, 26a: bearing, 27: curved pipe, 28, 28
a: discharge pipe, 29: discharge direction, 30: compressed air blowing nozzle, 30a: atmosphere inflow pipe, 40: transfer pump with hopper, 41: spiral blade (pushing means), 4
2: 2 feed blades (multi-feed blades), 43, 44: spiral blade pieces, 45: cavity

Claims (6)

[Claims] 1. A pump part having a rotating shaft arranged horizontally, the rotating shaft being provided with an impeller driven by a motor and a casing thereof, and an extension part of the rotating shaft, which has viscosity and fluidity. Pushing means for pushing the conveyed article into the pump section, a bearing for rotatably supporting the tip of the extension of the rotary shaft, and a charging hopper that is arranged directly above the pushing means and stores the conveyed article. Conveyor pump with hopper characterized by having 2. The transfer pump with a hopper according to claim 1, wherein the pushing means includes a screw blade having a twist angle of 5 to 30 °. 3. The transfer pump with a hopper according to claim 1, wherein the pushing means has a twist angle of 30 to 70 °.
Conveyor pump with hopper, which is equipped with a multi-row feed blade. 4. The hopper-equipped transfer pump according to claim 1, wherein the pushing means includes a spiral blade having a hollow portion formed at the center and a twist angle of 5 to 30 °. Transport pump. 5. The transfer pump with a hopper according to claim 1, wherein compressed air can be blown into the discharge pipe on the outlet side of the pump portion along the discharge direction of the conveyed product. A hopper-equipped transfer pump, wherein a compressed air blowing nozzle is attached to the discharge pipe at an acute angle. 6. The transfer pump with a hopper according to claim 1, wherein the discharge pipe on the outlet side of the pump portion is provided with an atmosphere inflow pipe along the discharge direction of the transferred product. Attached at an acute angle to the discharge pipe, and at the end of the transportation pipe extended in communication with the discharge pipe,
A transfer pump with a hopper, characterized in that a vacuum tank connected to a vacuum pump is connected.