JP2003054730A - Method for designing screw type conveyor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for designing a screw type conveyor having a high conveying efficiency. SOLUTION: The method for designing the conveyor having a screw conveyor for lifting the subject to be conveyed and a pushing screw conveyor for pushing the subject to be conveyed into the lifting conveyor includes determining a necessary pressure curve showing the necessary pressure within a lifting cylindrical casing and a generated pressure curve showing the pressure generated within a pushing cylinder casing, from an equation showing pressure at a certain position of the subject to be conveyed which is packed in the cylindrical casings; then determining, using a discharge efficiency curve, a discharge angle which corresponds to design discharge efficiency; determining the pressure needed for lifting, based on the necessary pressure curve which matches the discharge angle; generating the generated pressure equal to or greater than the required pressure in the pushing conveyor; and determining the rotation speed of the screw of each of the lifting and pushing conveyors based on the discharge efficiency, design discharge efficiency, and design amount of conveyance of the pushing conveyor matched the generated pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] TECHNICAL FIELD The present invention relates to a screw-type transfer.
The present invention relates to an apparatus design method. [0002] 2. Description of the Related Art Excavated from deep tunnel excavation work
And sediment, ore in the hold, and powder (including grains)
For example, if a screw conveyor is used
In addition, transport (lifting) is performed in a substantially vertical direction. [0003] Then, the transfer is performed at such a steep inclination.
In the case of a screw conveyor, the transferred object is a screw blade.
The centrifugal force based on the rotation of the root pushes the inner surface of the casing.
The transfer was being performed with the attachment. [0004] SUMMARY OF THE INVENTION
According to the conveyor, the conveyed material is in the casing by centrifugal force.
Being almost vertically raised while pressed against the surface
And therefore the filling rate in the casing decreases
Conveyance efficiency deteriorates, and the conveyor itself wears faster.
In addition, the screw itself is, for example, 500 RPM.
It is rotated at high speed, so the noise during operation is loud
There was a problem. [0005] Therefore, the present invention provides a screen having a high transfer efficiency.
The purpose of the present invention is to provide a method for designing a tandem type transfer device.
You. [0006] [MEANS FOR SOLVING THE PROBLEMS]
The method for designing a screw-type transfer device according to the present invention
Screw is rotatable in an inclined cylindrical casing
Screw conveyor for loading and pushing
Screws are placed in a cylindrical casing arranged almost horizontally.
Screw conveyor for pushing, which is arranged rotatably
And the screw conveyor for pushing
Push the conveyed object into the screw conveyor for loading and unloading
A state in which the load is filled in the inclined cylindrical casing
Of screw-type transfer device designed for unloading
The rotation axis of the screw in the cylindrical casing
Balance in the direction of rotation and screw rotation in the circumferential direction
The sheath filled in the cylindrical casing obtained from the balance of the force
The pressure (P_L), The following equation
When the load is filled in the casing,_L≧ 0
Of the discharge angle θ and the inclination
Need to show the relationship with the required pressure in the oblique cylindrical casing
Pressurization curve, discharge angle θ and emission in horizontal cylindrical casing
With the generation pressure curve showing the relationship with the raw pressure,
The emission efficiency, which indicates the relationship between the emission angle θ and the emission efficiency η,
Curve, and based on the above emission efficiency curve, the specified emission efficiency
The discharge angle corresponding to the discharge rate
From the required pressure curve above, determine the pressure required for lifting,
Apply the generated pressing force equal to or higher than this pressing force
It is generated on a conveyor and
The above generated pressure curve and discharge efficiency curve according to the applied pressure
From the discharge efficiency of the screw conveyor
And the screw conveyor for lifting and pressing
Of each screw on screw conveyor
From the relationship between each discharge efficiency and the design transport amount
is there. [0007] (Equation 2) However, the meanings of the symbols in the above formula are as follows.
You. C: constant = (D_b-2H) / D_b D_b: Screw outer diameter E: constant = (D_b-H) / D_b H: Screw groove depth K: lateral pressure coefficient = (1-sin^Twoφ_i/ 1 + sin^Twoφ_i) L: Screw conveyor effective length P_L: Pressure at conveyor length L P_O: Pressure at the conveyor inlet e: Screw blade thickness t: Screw pitch α_b: Torsion angle of screw outer diameter α_m: Torsion angle of screw average diameter α_r: Screw axis diameter torsion angle θ: discharge angle φ: Incline angle of screw conveyor μ_b: Coefficient of friction between the transferred object and the inner surface of the cylindrical casing μ_s: Coefficient of friction between transferred object and screw blade surface Respectively. [0008] According to the above design method, the transferred object is full.
From the formula that expresses the pressure inside the cylindrical casing
From the required pressurization curve with the obtained screw,
Need for screw conveyors for freight for efficiency
Calculate the pressing force and calculate the screw
And the pressing force exceeding this required pressure
To drive the screw conveyor for pressing
More efficient transport with the transported object filled
It can be done reliably. That is, inside the cylindrical casing
Compared to the case of transporting conveyed objects with a gap
And can be pumped at low speed,
Good transport efficiency, little wear between machines, and low noise
A small number of screw-type transfer devices can be obtained. [0009] BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
The method for designing a screw-type transfer device is shown in FIGS.
I will explain. First, a screw-type transfer device according to the present invention
Will be described with reference to FIG. 1 and FIG. this
The screw-type transfer device 1 is, for example, a hold 2 a of a cargo ship 2.
The granular material (an example of the material to be transported) J
Above) To discharge to the storage hopper 3 provided in G
Of the cargo handling device 4 and is arranged in a substantially vertical direction.
To transport the granular material J from below to above (hereinafter referred to as “lifting”).
Screw conveyor 5 for transport and almost horizontal direction
In the lower part of the screw conveyor 5 for freight
Screw conveyor 6 for forcing powders into granules
It is composed of The cargo handling device 4 is docked at the quay G.
Traveling on guide rails provided along the freighter 2
And the traveling frame 11 is
And above the quay
Girder member 12 extended on the cargo ship 2
A support member (not shown) suspended from the tip of the
Screw conveyor 5 supported by
Provided at the lower end of the support member, the powder J in the hold 2a is removed.
A collecting machine 13 for collecting by a plurality of buckets 13a;
The granular material J collected by the collecting machine 13 is used for the above-mentioned transportation.
Pushing screw for pushing into screw conveyor 5
Turmeric conveyor 6
Transferred to the upper part by screw conveyor 5
Belt conveyor that transports body J to quay G horizontally
And the powder and granules conveyed by the belt conveyor 14
A chute 15 for guiding J to the storage hopper 3;
It is composed of Next, a screw for conveying the granular material J
The c-type transport device 1 will be described with reference to FIG. Note that this
The screw-type transfer device 1 is a screw conveyor for unloading.
5 and a screw conveyor 6 for pushing.
First, the screw conveyor 5 for lifting is explained.
I do. [0013] That is, the screw conveyor for lifting
5 is a cylindrical casing supported by the support member in the vertical direction
21 and rotatably disposed in the cylindrical casing 21.
And a shaft (hereinafter also referred to as a screw shaft) 22
A blade portion (hereinafter also referred to as a screw blade) 2 on the outer periphery of a
2b screw for lifting (screw with shaft)
22) and rotate the screw 22 for lifting.
And a rotation driving device 23 for driving the motor. In addition,
As you can see from Fig. 2, twist the long screw so much
Rotate in three places to rotate without
ing. Of course, the cylindrical casing at each of these rotation points
The screw 21 is fixed to the outer periphery of the screw 22 for lifting.
When the rotating rings (not shown) are provided rotatably,
In both cases, these rotating rings are composed of the transmission shaft 24 and the gear mechanism.
25, and is rotationally driven by one electric motor 26.
You. Needless to say, without passing through the transmission shaft and gear mechanism,
Arrange several motors, each with a screw for lifting.
You can also rotate the window. Next, the screwing screw conveyor 6 is
It is placed horizontally in the horizontal direction, and the front end is
Lower end supply port 2 of cylindrical casing 21 of Ryu conveyor 5
1a, and a supply port 31a for the granular material is formed at the rear end.
The formed cylindrical casing 31 and the cylindrical casing 3
1 that is rotatably arranged in
A screw 32 for pushing formed in a bon shape and this pushing
Screw 32 for rotation using a rotating ring (see FIG.
(Not shown) via a gear mechanism.
It is composed of Here, each of the screws 22 and 32 is turned.
The configuration of the rotating rotating ring will be briefly described. This rotating ring
In the configuration using a screw blade, a predetermined width and
Fix the rotating ring formed
The rotatable ring is rotatably supported on the cylindrical casing side, and
Then, this rotating ring is connected to a ring gear provided on its outer peripheral surface.
That is rotated by an electric motor through
You. By the way, as described above, the gist of the present invention
Is the cylindrical casing 21 of the screw conveyor 5 for lifting.
Apply pressure to the transported object supplied into the lower part of the
By filling the entire inside of the housing 21
Efficient and low-speed transfer, that is, low-noise transfer
It is an object of the present invention to provide such a device, particularly a design method thereof. Designing such a screw conveyor
In this case, it is important to
The pressurized state, ie, the pressure state (also referred to as the transfer pressure)
Therefore, the present inventor has set the pressure state of the transferred object.
Elucidated theoretically, at any position in the cylindrical casing
Derives a formula that expresses the pressure of
Based on the specifications (specifications) of the screw conveyor
It is something that has been done. Hereinafter, the screw is rotatably arranged.
Calculate the pressure of the transferred object filled in the cylindrical casing
How to derive the calculation formula will be described. Here, the target
Transport direction from horizontal to lead
To be able to be applied to the first one,
For generalization, it is described as a screw conveyor with a shaft.
The objects to be conveyed are powders,
Friction acts between the screw conveyor
Apply to things. In order to simplify the equation, the following assumptions are made.
I am. The conveyed object (powder and granular material) in the cylindrical casing
Is in contact with The pressure is determined by the length (x) of the groove in the screw blade.
Function. Contact between the conveyed object and the screw conveyor side
The coefficient of friction with the surface is constant over the entire length, independent of pressure.
It is fixed. Ignore the gap between the screw outer diameter and the cylindrical casing
You. Transportation in the groove of the screw blade
Things work as plugs. Here, the symbols used in the following formulas are explained
I do. [Explanation of symbols] C: constant = (D_b-2H) / D_b D_b: Screw outer diameter D_m: Average screw diameter D_r: Screw shaft diameter (Hole of ribbon screw blade)
Diameter) E: constant = (D_b-H) / D_b H: Screw groove depth K: lateral pressure coefficient = (1-sin^Twoφ_i/ 1 + sin^Twoφ_i) L: Screw conveyor effective length P_L: Pressure at conveyor length L P_O: Pressure at the conveyor inlet R: Screw radius W: Effective width of screw blade e: Screw blade thickness t: Screw pitch α_b: Torsion angle of screw outer diameter α_m: Torsion angle of screw average diameter α_r: Screw axis diameter torsion angle γ: Bulk density of transferred object η: Emission efficiency θ: discharge angle φ_i: Internal friction angle of transferred object φ: Incline angle of screw conveyor μ_b: Coefficient of friction between the transferred object and the inner surface of the cylindrical casing (ρ_b
= Tan^-1μ_b) μ_s: Coefficient of friction between transferred object and screw blade surface (ρ_s=
tan^-1μ_s) Subscript b: Screw outer diameter fp: Screw side pushing side ff: Screw side pulling side m: Screw average (center) diameter r: Screw root diameter FIG. 3 shows one pitch of the blade portion 42 of the screw 41.
Minute, that is, the cover filled in the groove 43 of the screw blade.
Shows the equilibrium state of static forces acting on a small part
ing. [0022] In the state in which the conveyed objects such as powder and granules are filled
When transporting, between the transported object and the screw 41
Between the frictional force acting on the screw and the thrust of the screw 41
The engagement (balance) becomes dominant. First, consider the balance of force in the screw axis direction.
I can. In the balanced state, the sum of the component forces in the rotation axis direction is zero.
It is expressed by the following equation (1). [0024] [Equation 3] Here, lateral pressure coefficient (horizontal direction of force acting in the vertical direction)
Is expressed as K), the following equation (2) is obtained.
Can be [0025] (Equation 4) Circumferential Length of Blade 42 in Screw 41 and Screw
The following equation (3) is obtained from the geometrical relation in itself.
It is. [0026] (Equation 5) Substituting the relationship of equation (3) into equation (2) above gives the following:
Equation (4) is obtained. [0027] (Equation 6) The above equation (4) is replaced with the following equation (5) and rearranged.
And the following equation (6) is obtained. [0028] (Equation 7) Next, considering the balance of force in the screw rotation direction,
It looks like below. The component force in the direction perpendicular to the screw axis is
And the sum is zero,
Equation (7) is obtained. Equation (7) is divided by R
I have. [0030] (Equation 8)Further, the coefficient of the equation (7) is represented by a symbol shown in the following equation (8).
By replacement, equation (9) is obtained. [0031] (Equation 9) By dividing the above equation (9) by the equation (6), the following equation (10) is represented by k.
When arranged and arranged, the following equation (11) is obtained. [0032] (Equation 10) Here, the above equation (11) is replaced by the following equation (12) and (1)
By replacing with the symbol shown in the equation (3), the following (1)
4) Equation is obtained. [0033] (Equation 11) By integrating the above equation (14), the initial condition is defined as x_b= 0 and P
= P₀Then, the pressure P at an arbitrary position (x)_xIs below
Expression (15) is used. [0034] (Equation 12) In addition, the dimensional relationship of the screw is expressed by the following equation (16).
Shall be represented. [0035] (Equation 13) By the way, the friction coefficient μ between the transferred object and the cylindrical casing_b
And the coefficient of friction μ between the transferred object and the screw_sIs different
When changing the direction of the groove on the screw blade,
To convert in the c-axis direction, x_b= L / sinα_bTo be
And the distance L from the entrance in a common screw with a shaft
Pressure at_LIs represented by the following equation (17). [0036] [Equation 14] In addition, screws can be removed from ordinary shaft screws
Ribbon screw without center axis and this ribbon screw
A fixed central shaft (hereinafter referred to as a fixed shaft)
) Is assumed to be inserted._LIs
These are expressed by the following equations (18) and (19), respectively.
In this case, the friction coefficient μ between the transferred object and the cylindrical casing_b
And the coefficient of friction μ between the transferred object and the screw_sIs almost equal
(Μ). In the case of a ribbon screw; [0038] (Equation 15) When the fixed shaft is inserted into the ribbon screw; [0039] (Equation 16) By the way, when the transported object (powder and granular material) is filled, for example, lead
Directly upward (although not necessarily vertical)
The pressure P in the cylindrical casing_LIs at least
Must be positive or "zero". That is, in equation (17), φ = 90
P with degree_LEquation as simple as the following equation (20)
And the condition that the value of equation (20) is positive
Thus, the following equation (21) is obtained. [0041] P_L= P₀× S−T × (S-1) (20) In equation (20), S is the exp of the right-hand side of equation (17).
T indicates the front part of the second term on the right side of equation (17).
are doing. Where P_LIf ≧ 0, the following (21)
An expression is obtained. P₀≧ T × (1-1 / S) (21) Here, since (1 / S) ≒ 0, the following equation (22) is obtained.
can get. P₀≧ T (22) In the above equation (22), P₀= T
The graph, that is, the required
The pressure is shown in FIG. 4 (the conditions are shown in the figure), and more specifically
Is a screw conveyor with a vertical axis where φ is 90 degrees.
The case is shown in FIG.
The case of a screw-shaped screw conveyor is shown in (b).
Vertical ribbon-shaped screw conveyor with a twist φ of 90 degrees
(C) shows a case where the fixed shaft body is inserted at the center of (b).
In FIG. 4, the horizontal axis indicates pressure, and the vertical axis indicates discharge angle θ (described later).
Is shown). Further, in the same manner as described above,
Pressing force at Ryu Conveyor 6 (It is also the pushing force.
Below, referred to as the generated pressure) by equation (17).
Can be. In this case, φ in Expression (17) is set to 0 degree. FIGS. 4D and 4E show a pressing screw.
The pressure generated at the conveyor 6 is shown.
(D) Pressure generated by screw conveyor with horizontal shaft
(E) on the horizontal ribbon screw conveyor
This shows the generated pressure. FIG. 4F shows a screw conveyor.
Curve showing the relationship between the discharge angle θ and the discharge efficiency η
is there. The above discharge efficiency η is (actual discharge of screw conveyor
Output / theoretical discharge of the screw conveyor).
It is expressed by equation (23). [0047] [Equation 17]   η = tan θ / (tan θ + tan α_b) ・ ・ ・ (23) Here, FIG. 5 shows the relationship between the discharge efficiency η and the discharge angle θ of the transferred object.
Show the relationship. In FIG. 5B, the particles at point A
When the Ryu moves to point A 'in one rotation, the particles are
Has shifted by one pitch t, the emission efficiency η becomes
1.0. However, screw and cylindrical casing
The particles at point A have moved to point B due to friction between the particles and the particles.
Then, the moving distance of the particles becomes ηt, and the emission efficiency η
Is smaller than 1.0. At this time, the discharging directions of the particles are point A and point B.
And a cross section perpendicular to the screw axis.
The angle formed is θ, and this θ is called the discharge angle. Also,
FIG. 5 (a) shows a development view of the screw blade,
The particle at point A moves to point B with one rotation of the screw,
The direction will have an angle θ. Then, the AC is applied outside of one rotation of the screw blade.
Perimeter (πD_b), ΠD_b= Ηt (cotα_b+
cotθ), t = πD_btanα_bΗ is above
It can be expressed by equation (23). Further, the discharge efficiency η is expressed as (2
The expression 3) is obtained by rotating the screw as shown in the following expression (24).
The number of turns can be represented by n. [0052] (Equation 18)   η = tan θ / (tan θ + tan α_b)     = Q / ｛(π (D_b ^Two-D_r ^Two) / 4) (te) n｝ (24) However, equation (24) shows the case of a screw with a shaft.
In the case of a ribbon screw, (π (D
_b ^Two-D_r ^Two) / 4) is (πD_b ^Two/ 4). That is, from the above equation (24), the discharge efficiency
If you know η and theoretical emission Q, the screw rotation speed
n can be determined. Where D_b, T, e
The dimensions related to the ryu, depending on, for example, the transfer capacity
Is almost fixed, and if you change it,
If determined together with the rotation speed n so as to satisfy the efficiency η,
Good. Here, using the graph shown in FIG.
Screw conveyor and push screw conveyor
A description will be given of an efficient design method. Here,
Is a screw conveyor with a shaft as a screw conveyor for lifting.
Turmeric conveyor shall be used.
Using a ribbon-shaped screw conveyor as the conveyor
And First, when designing a screw conveyor,
First, theoretical emissions Q based on the specifications and their emissions
The efficiency η is, for example, Q₁And η₁Is determined (set). You
Then, from the curve of the emission efficiency η shown in FIG.
Constant value η₁Discharge angle θ at₁Is obtained, and this θ₁Corresponding to
Required by screw conveyor with vertical shaft
The force ΔP is calculated from the curve (a) by ΔP₁Do you know
You. That is, a screw conveyor with a vertical shaft
Necessary for pushing the powdered material
Pressing force, i.e. the starting force on the screw conveyor
Raw pressure is ΔP₁It is a condition that it is greater than
4 (e), the ribbon-shaped screw conveyor is generated.
From the pressure curve, ΔP₁Emission efficiency η corresponding to_TwoAnd discharge angle
θ_TwoIs found. The screw for lifting thus obtained
Ejection in turmeric conveyors and screw conveyors for pressing
Output efficiency η₁And η_TwoFrom equation (23), based on
Screw rotation speed n₁And n_TwoIs required. The rotation speed n₁And n_TwoGet
To determine the dimensions of each part of the screw
Next, a rotation driving unit, for example, an electric motor is selected, and the rotation speed
₁And n_TwoThen you can drive. This rotation speed n₁The cargo handling equipment described above
Screw in the screw-type transfer device 1 of the device 4
While operating the c22, the rotation speed n_TwoPush in
When the screw 32 is rotated, the powder particles in the hold 2a
Screw conveyor 5 for lifting J with required pressure
Side of the tubular casing 2
1. It is possible to reliably discharge the granular material J in a state filled with
it can. In other words, as in the conventional case,
Compared to the case where cargo is transported with a gap
About / 10 (for example, about 500 to 40 rotations)
Can be transported at a rotation speed of
Good transport efficiency, little wear between machines, and low noise
It is possible to provide a small number of screw-type transfer devices. Here, each screen is calculated using specific numerical values.
The pressure in the window is compared and examined. However, comparison
The screw dimensions to be considered are as follows. Screw outer diameter: D_b= 1.0 Screw shaft diameter (hole diameter of ribbon-shaped screw blade): D
_r= 0.4D_b Screw pitch: t = 1.0D_b Screw blade thickness: e = 0.07D_b Screw blade height: H = 0.3D_b Screw conveyor length: L = 20D_b Coefficient of friction: μ_b= Μ_s= 0.5 Internal friction angle: φ_i= 25 ° In FIG. 4, for example, a vertical ribbon-shaped screw conveyor
When the discharge efficiency is set to 0.33, that is, the discharge angle θ
When operating at 9 degrees, the required pressure P_RIs about 1.3γ
D_bAnd γ is 1.2 t / m^ThreeAnd D_bIs 0.3m
The required pressure P_RIs 0.00459 MPa
(1.3 × 1.2 × 0.3 = 0.468 t / m^Two= 0.
0468 kg / cm^Two). On the other hand, a screw-con
Similarly, if the discharge efficiency is 0.33 and the discharge angle θ is 9
When operating in degrees, the required pressure P_RIs about 5γD_bTona
And γ is 1.2 t / m^ThreeAnd D_bIs 0.3m
Is the required pressure P_RIs 0.0176 MPa (5 × 1.2
× 0.3 = 1.8 t / m^Two= 0.18kg / cm^Two)
Therefore, the required pressure is
3.8 times that of the That is, when the emission efficiency η is the same,
For screw conveyors with a vertical axis, ribbon
If there is no large pressing force compared to a conveyor,
You can see that it cannot be sent. FIG. 4 shows that a screw shaft with a vertical shaft
In case of conveyor, if discharge angle θ exceeds 10 degrees, necessary pressurization
Force P_RSuddenly grows larger, so a screw
If the discharge angle θ at the conveyor is around 10 degrees is the economic upper limit
It is considered that the discharge efficiency η at this time is 0.36. On the other hand, a ribbon-shaped screw conveyor and
Ribbon-shaped screw conveyor with fixed shaft inserted at the center
When the discharge angle θ exceeds 15 degrees, the required pressure P_R
And the emission angle θ is around 20 degrees is the economic upper limit.
It is thought that. The emission efficiency η at this time is 0.54
You. Such a screw conveyor for lifting (vertical)
Except for the example of a screw conveyor with a straight shaft)
Means that the discharge efficiency η is 0.1 to 0.6 (for discharge angle θ, 2 degrees
It is preferable to operate in the range of (.about.25 degrees). Next, the screw conveyor for pushing is described.
This will be described using specific numerical values. Push-in screw
In the conveyor, the pressure P_LBut the screw for the transportation
Required pressure P of turmeric conveyor_RDriving to be bigger
Is performed. In FIG. 4, a vertical ribbon-shaped screw
The same pressure as the required pressure at the discharge angle of 9 degrees of the conveyor
And a ribbon-shaped screw with a fixed shaft inserted in the center
When the conveyor is operated, the vertical ribbon screw conveyor
In contrast to the emission efficiency η of
Fixed shaft is inserted at the center to generate the required pressure
Discharge efficiency of ribbon-shaped screw conveyor is 0.4
2, a ribbon-shaped screen with a fixed shaft inserted in the center
It can be seen that the Ryu Conveyor has better discharge efficiency. In addition, a screw conveyor with a vertical shaft
Water that generates the required pressure when operating at a discharge angle of θ
For screw conveyor with flat shaft, discharge angle θ is 11 degrees
And the emission efficiency η is 0.38, whereas the horizontal ribbon
Screw conveyor, discharge angle is 25 degrees, discharge
Efficiency 0.6, need screw conveyor with vertical axis
The applied pressure will be satisfied. This is a horizontal ribbon
Screw conveyor can be downsized.
ing. Conversely, the vertical ribbon screw conveyor is discharged
Driving with an angle of about 23 degrees and an emission efficiency of about 0.6
Wear. In addition, a ribbon-shaped switch with a fixed shaft inserted in the center
When operating the screw conveyor at a discharge angle of 9 degrees, the discharge
When the exit angle θ is 40 degrees, the emission efficiency η is 0.8,
Screw conveyor with a fixed shaft inserted into the
Can operate more efficiently. In the above embodiment, the lifting
A screw with a shaft has been described as the screw 22 for feeding.
But with a fixed shaft in the ribbon screw or in the center
Ribbon-shaped screw which may be
Ribbon screw has been described as screw 32
However, a screw with a shaft may be used. Further, the screw according to the above embodiment
As shown in Fig. 2, in the case of the transport type,
To be transported on the screw conveyor 5 for transport
Screw-in for horizontal push-in for pushing in the horizontal direction
Although one bearer 6 is provided, for example, as shown in FIG.
Screw conveyor 6A for pushing in the direction and lifting
Between the screw conveyor 5
The screw conveyor 6B for inclined pushing is provided.
May be. That is, the transferred object, the cylindrical casing and
Coefficient of friction μ between screw and screw and ratio of transferred object
If the weight γ increases, use a screw conveyor for
The pressure in the layer 5 is zero or more (P_L≧ 0)
Pressure P for₀Is excessive, but as described above
The screw conveyor for pushing
Better able to cope with such excessive pushing pressure
You. Also, the screw conveyor 6B for tilting and pushing.
Moves the movable joint 51 to the screw conveyor 5 for lifting.
Screw conveyor 6A for horizontal pushing
To the movable joint 52 with respect to the screw conveyor 6B for pushing
Are connected to each other so that they can swing freely.
Between Ryu Conveyor 5: 6B and 6B: 6A, each other
Cylinder devices 53 and 54 for adjusting the force are provided to
Handles any shipment posture (loading state)
It is configured to be able to. [0073] As described above, the screw type transfer of the present invention is carried out.
According to the design method of the equipment,
The screen obtained from the calculation formula that expresses the pressure in the cylindrical casing
From the required pressurization curve for Ryu, it is possible to
Required pressure on the screw conveyor for unloading
The screw rotation speed from the discharge efficiency curve.
And press with a pressing force that exceeds this required pressing force.
Transported by driving the screw conveyor
It is necessary to carry out efficient and reliable
Can be. That is, as in the conventional case,
Compared to lifting a conveyed object with a gap inside
And can be pumped at low speed,
Good transport efficiency, little wear between machines, and low noise
It is possible to provide a small number of screw-type transfer devices.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a use state of a screw-type transfer device according to an embodiment of the present invention. FIG. 2 is a sectional view of the screw-type transfer device. FIG. 3 is an enlarged view of a main part of the screw for explaining a principle for obtaining a pressure in a cylindrical casing of the screw type transport device. FIG. 4 is a graph showing a required pressurizing curve, a generated pressurizing curve, and a discharge efficiency curve in each tubular casing of the screw-type transfer device. FIG. 5 is a diagram illustrating a relationship between a discharge efficiency and a discharge angle in the screw-type transfer device. FIG. 6 is a side view showing a usage state in a modified example of the screw-type transfer device. [Description of Signs] 1 Screw-type transfer device 5 Screw conveyor for lifting and feeding 6 Screw conveyor for pushing 21 Cylindrical casing 21a Supply port 22 Screw for lifting 26 Electric motor 31 Cylindrical casing 32 Screw for pressing 33 Electric motor

Claims (1)

Claims: 1. A screw conveyor in which a screw for lifting is rotatably arranged in an inclined cylindrical casing, and a cylindrical screw in which a screw for pushing is arranged substantially horizontally. A pushing screw conveyor rotatably arranged in the casing, and the pushed screw conveyor pushes the object to be conveyed into the lifting screw conveyor to cover the object in the inclined tubular casing. A method for designing a screw-type transfer device in which lifting is performed in a state in which a conveyed object is full, wherein a force is balanced in a rotational axis direction of the screw in a cylindrical casing and a screw is rotated in a circumferential direction of the screw. the following formula shows the pressure (P _L) at any position, the transported object in the cylindrical casing filling of the transported object, which is filled with the cylindrical casing resulting from force balance It is by deforming with a condition that is a P _L ≧ 0, the required pressurization curve showing the relationship between the required pressure at the inclined cylindrical casing and the discharge angle theta, and a discharge angle theta and a horizontal tubular In addition to obtaining a generated pressurization curve indicating a relationship between the generated pressure in the casing and a discharge efficiency curve indicating a relationship between the discharge angle θ and the discharge efficiency η, a predetermined discharge efficiency is determined based on the discharge efficiency curve. In addition to obtaining the corresponding discharge angle, the pressing force required for lifting is calculated from the required pressurizing curve according to the discharging angle, and the generated pressing force equal to or higher than this pressing force is generated by the screwing screw conveyor. According to the generated pressurizing force, the discharge efficiency of the pushing screw conveyor is obtained from the generated pressurizing curve and the discharging efficiency curve. A method for designing a screw-type transfer device, wherein a rotation speed of each screw in a screw-in screw conveyor is obtained from a relationship between each discharge efficiency and a designed transfer amount. (Equation 1) However, the meanings of the symbols in the above formula are as follows. C: constant _{= (D b -2H) / D} b D b: screw outer diameter E: constant _{= (D b -H) / D} b H: screw groove depth K: lateral pressure coefficient = (1-sin ² φ _i / 1 + sin ² φ _i ) L: screw conveyor effective length P _L : pressure at conveyor length L P _O : pressure at conveyor inlet e: screw blade thickness t: screw pitch α _b : screw angle α _m of screw outer diameter: Torsion angle of screw average diameter α _r : Torsion angle of screw shaft diameter θ: Discharge angle φ: Slope angle of screw conveyor μ _b : Coefficient of friction μ between transferred object and inner surface of cylindrical casing μ _s : Transferred object and screw blade It represents the coefficient of friction with the surface.