JPH0331118A - Granule transport device - Google Patents

Abstract

PURPOSE:To prevent blockage for stabilizing transport with a small size device by providing a pressure sensor on a transport pipe, and injecting secondary air into the transport pipe from an injection gas feed pipe, according to the detected action of the pressure sensor. CONSTITUTION:At blockage of a transport pipe 5, pressure rise in the transport pipe 5 is detected with a pressure sensor 11 to drive a control valve 13. Hereby, injection gas 10 is injected into the transport pipe 5 from an injection gas feed pipe 7 through the control valve 13 and a gas injection means 12 (check valve) to dissolve the blockage. A plurality of blockage dissolving mechanism 9 actuating in this way are appropriately provided on the transport pipe. By this constitution, blockage is effectively dissolved and stable transport can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a powder transport device that can effectively eliminate blockages and realize stable powder transport.

(b), Prior art Fig. 9 is a diagram showing a conventional example of a method for eliminating blockage when transporting powder or granular material by air; Fig. 1o is a diagram showing the transport pipe and 7 is a graph showing the distribution of the pressure inside the secondary air pipe in the transport direction during normal transport and when a blockage occurs.

Conventionally, when transporting powder and granules by air, low-speed, high-concentration transport is carried out in order to reduce the crushing of the powder and the wear of transport pipes. It is necessary to realize stable transportation of powder and granule by eliminating blockage, that is, a phenomenon in which powder and granular material gets stuck in a transport pipe during transportation and obstructs the transportation operation. One way to resolve this blockage is to
For example, as shown in FIG. 9, secondary air 1o is supplied along the transport pipe 5 provided between the blow tank 2 and the stock tank 3 to destroy the plug 27 that causes the blockage. Next, pipe the air pipe 7 and transport pipes 5 and 2.
A diaphragm valve sensor 29 (29A,
298.29°) and check valves 12 are provided at predetermined intervals (three in FIG. 9), and these deocclusion mechanisms 9 close the inside of the transport pipe 5 and the secondary air pipe. A method has been adopted to detect the differential pressure within 7 and eliminate the blockage. That is, during normal transportation, as shown by the solid line in FIG. 10(,), the pressure inside the transport pipe 5 and the secondary air pipe 7 has a nearly constant pressure gradient from upstream on the left side to downstream on the right side in the figure. However, if a blockage occurs in the transport pipe 5, the inside of the transport pipe 5 will move upstream from the point P where the blockage occurs, as shown by the dashed line in Figure (a). An extreme pressure difference occurs on the downstream side, and on the other hand, the inside of the secondary air pipe 7 becomes high pressure as a whole. As a result, the pressure inside the transport pipe 5 increases to 2
Next, the pressure becomes lower than the pressure inside the air pipe 7, and the diaphragm valve sensor 29 provided in that part is activated by the differential pressure.
Communication of the secondary air pipe 7 to the stock tank 3 is cut off. Then, the pressure inside the secondary air pipe 7 on the upstream side of the diaphragm valve sensor 29 becomes high, and as a result, the check valve 12 on the upstream side shown in FIG. By injecting the liquid toward the plug 27 in the transport pipe 5 through the check valve 12, the blockage in the transport pipe 5 is eliminated.

Another method for eliminating blockages is to install secondary air pipes in the same way as the above method and provide multiple solenoid valves between the transport pipe and the secondary air pipes. A pressure sensor detects the pressure increase in the side transport pipe, sends an electric signal to the solenoid valve to open the solenoid valve, and discharges secondary air from the secondary air pipe via the solenoid valve. Electrical deblocking methods have also been employed to attempt to clear blockages.

(C) 1. Problems to be Solved by the Invention However, in the former blockage clearing method, as shown in FIG. Secondary air 10 is supplied by branching from the transport air source 35, and even during normal transport, that is, when no blockage occurs, the secondary air 10 is supplied in preparation for the occurrence of blockage.
must be constantly fed into the secondary air pipe 7, a large amount of air is required, and the equipment and facilities such as the transport air source 35 have to be enlarged. If the tip of the secondary air pipe 7 is closed to avoid air discharge, the pressure inside the secondary air pipe 7 will rise to the supply pressure from the transport air source 35, as shown by the broken line in FIG. 10(a). The pressure rises uniformly and becomes higher than the pressure inside the transport pipe 5.
The blockage resolving mechanism 9 operates even though no blockage has occurred inside the blockage. ). In addition, if a blockage occurs immediately before the stock tank 3, as shown by the dashed line in FIG.
(shaded area), the pressure difference between the transport pipe 5 and the secondary air pipe 7 may become insufficient, and the diaphragm valve sensor 29 may not operate. Furthermore, if the secondary air 10 leaks for some reason from one of the plurality of diaphragm valve sensors 29, for example, the most upstream diaphragm valve sensor 29A shown in FIG. ), the pressure in the secondary air pipe 7 on the downstream side of the diaphragm valve sensor 29A decreases, and if a blockage occurs in this state, as shown by the solid line in FIG. As shown, the pressure difference between the transport pipe 5 and the secondary air pipe 7 may become insufficient, and the diaphragm valve sensor 29 may not operate.

Furthermore, in the latter electrical blockage clearing method, the electrical control circuit is complicated due to the use of a large number of solenoid valves, and the wiring work is also complicated, which inevitably increases the cost of introducing the blockage clearing system.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, an object of the present invention is to provide a powder transport device that can economically eliminate blockage using tJz type equipment and equipment and stably transport powder and granules. shall be.

(d) Means for solving the zero problem, that is, the present invention has a transport gas supply source (35), and a transport system capable of transporting powder and granular material (6) to the transport gas supply source (35). In a powder transport device (1) connected to a pipe (5), an injection gas supply pipe (7) is connected to the transport pipe (5), one end is connected to the transport gas supply source (35), and the other end is closed. A pressure sensor (11) is provided in the transport pipe (5) so as to be freely driven by the pressure within the transport pipe (5),
The gas injection means (12) is inserted into the transport pipe (5).
5) so that the injection gas (10) can be supplied only in one direction to the injection gas supply pipe (7) and the gas injection means (1).
2) A control valve (13) is provided between the pressure sensors (13) and can be driven to open and close in response to the operation of the pressure sensor (11).

In addition, a blockage elimination mechanism (9) consisting of a control valve (13), a pressure sensor (11), and an injection gas supply pipe (7) provided downstream of the transport pipe (5) of the pressure sensor (11) is connected to the transport pipe. It is configured by providing two or more along (5).

Further, the pressure sensor (11) is moved to at least a first position (Pl) and a second position (P2) by the pressure inside the transport pipe (5).
) is provided, and a valve element (llb) is provided that is driven to move between
) is in the first position 7- (Pl), outputs a signal to close the control valve (13), and the pressure inside the transport pipe (5) is high and the valve element (llb) is in the second position (Pl). P2), the signal output means (1) outputs a signal to open the control valve (13).
1h, llk, 11m).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r (e) below
The same applies to the column ``, action''.

(e) Zero effect With the configuration described above, the present invention allows the pressure sensor (11) to connect to the transport pipe (5) when a blockage occurs in the transport pipe (5).
The control valve (13) is driven by detecting the increase in pressure due to the blockage in the injection gas supply pipe (7), and the injection gas (10) in the injection gas supply pipe (7) is sent to the transport pipe via the control valve (13) and the gas injection means (12). (
5) It acts so that it is injected into the air.

Further, in the present invention, the plurality of blockage clearing mechanisms (9) function to effectively clear blockage in any part of the transport pipe (5).

Further, in one aspect of the present invention, when a blockage occurs in the transport pipe (5), the valve element (llb) moves from the first position (Pl) to the second position ( P2), the control valve (13) is driven to move by the signal output means (11).
h, llk, 11m).

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a diagram showing an embodiment of the powder transport device according to the present invention, FIG. 2 is a front cross-sectional view of the vicinity of the blockage resolving mechanism of the powder transport device shown in FIG. 1, and FIG. 2 is a front sectional view showing an example of how the blockage clearing mechanism operates, and FIG. 4 is an enlarged sectional view of a pressure sensor in the blockage clearing mechanism shown in FIG. 2.

FIG. 5 is an enlarged sectional view of the pressure sensor of FIG. 4 during operation.

6 is an enlarged sectional view of the diaphragm valve in the blockage resolving mechanism shown in FIG. 2, FIG. 7 is an enlarged sectional view of the check valve in the blockage removal mechanism shown in FIG. 2, and FIG. 8 is shown in FIG. 1. It is a graph showing the distribution of the pressure inside the pipes in the transport direction during normal transport and when blockage occurs in the transport pipe and the secondary air pipe that constitute the powder transport device.

As shown in FIG. 1, a powder transport device 1 according to the present invention has a blow tank 2 storing a powder 6 to be transported, and a transport air inlet 2 formed in the blow tank 2.
A transportation air source 35 such as a compressor is connected to the transport air source 35 via a regulator 36. On the right side of the diagram of blow tank 2.

A stock tank 3 is installed to receive the powder and granular material 6, and a transport pipe 5 is provided between the stock tank 3 and the blow tank 2 to transport the powder and granular material 6 stored in the blow tank 2 as shown by the arrow in the figure. It is piped to be transported in the B direction to the stock tank 3. A secondary air pipe 7 is provided in the transport pipe 5 .
The blow tank 2 and stock tank 3 are
One end of the secondary air pipe 7 is connected to the transport air source 35 via another regulator 36□, and the other end is closed. Further, a blockage elimination mechanism 9 (96, 9, 9c,
9D, 9□, etc.), the secondary air 1 in the secondary air pipe 7 is
A plurality of them are provided along the transport pipe 5 so that the blockage can be cleared by injecting zero.

That is, as shown in FIGS. 1 and 2, the blockage elimination mechanism 9 includes a pressure sensor 11 connected to the transport pipe 5 along the transport pipe 5, three check valves 12, and a secondary air It has a diaphragm valve 13 connected to the pipe 7, and the pressure sensor 11 is provided upstream of the transport pipe 5 than the check valve 12, that is, on the powder supply side. Further, the diaphragm valve 13 is connected to the pressure sensor 11 via a control air pipe 15 and to each check valve 12 via an air supply pipe 16. This pressure sensor 11
As shown in the figure, it has a hollow cylindrical main body 11a with a transport pipe connection port 11n formed at the lower end of the figure.
Inside a, a round rod-shaped plunger llb is provided so as to be slidable in the directions of arrows C and D, which are the directions of the axis CT1 of the main body 11a. A narrow diameter portion 11h is formed over a length L2 at approximately the center of the plunger llb in the direction of the arrow C1D, and a cylindrical control air is formed between the narrow diameter portion 111h and the inner wall 11j of the main body 11a. A circulation space 17 is formed. In addition, two O-rings lli and lli are attached to the plunger llb portion of the narrow diameter portion 11h on the upper side in the figure, extending over the entire circumference of the inner wall 11j of the main body 11a at a predetermined distance L3 in the directions of arrows C and D. In a contact form, that is, these ○ rings 111, l
This is provided to improve the airtightness of the sealed space 40 formed between the lis.

Also, on the upper side of plunger llb in Fig. 4, arrows C and D are shown.
A spring that can be expanded and contracted in the direction of the plunger
The plunger llb is pressed in the downward direction of the arrow in the figure through a flange 11d formed in b, and the spring lie abuts and engages with the main body 11a through a washer Lie. There is. The washer lie is provided with a pressing force adjusting screw llf for adjusting the pressing force of the spring 11c, and by rotating the pressing force adjusting screw 11f around the axis CT1 in the directions of arrows M and N, By expanding and contracting the spring lie in the directions of arrows C and D via the washer lie, the pressing force on the plunger llb can be adjusted.

By the way, the lower main body 11a of plunger llb in FIG.
A diaphragm l1g is provided in the portion so as to be able to be pushed by a distance L1 in the directions of arrows C and D.
The upper surface of the plunger g is in close contact with the lower end of the plunger 11b in the figure. Further, a control air intake port 11k is formed in the body 11a portion on the right side in the figure of the sealed space 40 formed between the O-rings lli, lli in a manner that communicates the inside and outside of the body 11a. The control air pipe 15 is connected to the control air suction port 11k so as to communicate with the closed space 40 via the control air suction port 11k. Further, a control air discharge port 11m is formed in a portion of the main body 11a on the left side in the figure of the narrow diameter portion 11h in a manner that communicates the inside and outside of the main body 11a. Therefore, as shown in FIG. 4, when the diaphragm l1g is pressed in the direction of the arrow by the pressing force of the spring llc via the plunger llb and is positioned at the control air closing position P1, the small diameter of the plunger llb Control air circulation space 17 around part 11h
is cut off from the sealed space 40 (therefore also cut off from the control air pipe 15) by the O-ring 111 on the lower side of the figure, and communicates only with the outside of the main body 11a via the control air outlet 11m. As shown in the figure, the diaphragm l1g deforms into a dish shape protruding in the direction of the arrow C against the pressing force of the spring 11c in the direction of the arrow C, and reaches the control air release position.
2, the control air circulation space 17 not only communicates with the outside of the main body 11a via the control air outlet 11m, but also communicates with the control air pipe 15 via the control air intake port 111 ( It goes through.

The diaphragm valve 13 connected to the secondary air pipe 7 has a hollow main body 13a, as shown in FIG.
The main body 13a is biased in the direction of arrow F pointing downward in the figure by a spring 13d provided in the main body 13a, and is in contact with the entire circumference of the annular partition wall 13e formed on the main body 13a. The interior of the air chamber 13a is divided into three air chambers 19, 20, and 21, and is provided so as to be freely pushable in the directions of arrows E and F, which are the vertical directions in the figure. The first air chamber 19 in the upper part of the figure connects to the second air chamber 20 in the lower part of the figure via the diaphragm 13b to the main body 13.
They are provided facing each other along the axis CT2 of the diaphragm 13b, and are adjacent to the third air chamber 21 on the left side in the figure via the diaphragm 13b. A predetermined number of secondary air passage holes (not shown) through which the secondary air 10 can pass from the third air chamber 21 to the first air chamber 19 are formed in the contacting portion. In addition, the second air chamber 20
and the third air chamber 21 are adjacent to each other via the partition wall portion 13c. Note that the first air chamber 19 is connected to the control air outlet 13.
The second air chamber 20 communicates with the air supply pipe 16 via the secondary air outlet 13f, and the third air chamber 21 communicates with the control air pipe 15 through the secondary air outlet 13f. It communicates with the secondary air pipe 7 via an air intake port 1.3g.

The check valve 12 connected to the transport pipe 5 has a cylindrical casing 12a, as shown in FIG. A discharge port 12b is formed. Also, casing 1
The check valve 22 is located on the upper side of the figure 2a, and the O ring 12c
A secondary air circulation space 39 is formed in the casing 12a by closely contacting the upper surface of the casing 12a.
6- The check valve 22 has a cylindrical main body 22a. A secondary air intake port 22 is provided at the top of the main body 22a.
b is formed to communicate with the second air chamber 20 of the diaphragm valve 13 through the air supply pipe 16 and the secondary air discharge port 13f, and four secondary air jets are provided at the lower part of the main body 22a. The outlet 22C communicates the space inside the main body 22a with the secondary air circulation space 39 in a direction perpendicular to the axis CT3 of the check valve 22, that is, in the direction of arrows R and S, which are left and right directions in the figure, and in the direction perpendicular to the paper surface. It is perforated in the direction.

Furthermore, a cylindrical rubber sleeve 22 is provided on the circumferential surface of the main body 22a.
d is provided so that the four secondary air jet ports 22c can be opened and closed with respect to the secondary air circulation space 39 by elastic expansion and contraction in a direction away from the axis CT3, for example, in the directions of arrows R and S. There is.

Since the powder transport device 1 has the above configuration,
Using the powder transport device 1 shown in Fig. 1, the blow tank 2 is
When transporting the powder and granular material 6 stored in the blow tank 2 to the stock tank 3, the air supply source 35 is driven and the blow tank 2 is transported.
Transport air 23 at a predetermined transport pressure (usually 3 to 5 kg/cd) is supplied through the regulator 36A and the inlet 2a.
At the same time, connect the regulator 36B to the secondary air pipe 7.
via a pressure higher than the transport pressure (for example, 7 kg/d
) is supplied with secondary air 1o. Then, blow tank 2
The powder and granular material 6 inside is supplied to the transport pipe 5 by the pressure of the input transport air 23, is transported inside the transport pipe 5 in the direction of arrow B, and is transferred to the stock tank 3 located at the tip of the transport pipe 5.
will be supplied to. At this time, the pressure inside the transport pipe 5 maintains a steady state in which it decreases with a substantially constant pressure gradient from upstream on the left side to downstream on the right side in the figure, as shown by the solid line in FIG. 8(a). On the other hand, the secondary air 10 supplied to the secondary air pipe 7 is supplied to the diaphragm valves 13 of all the blockage release mechanisms 9 of the powder transport device 1 shown in FIG. 1, and as shown in FIG. , the third air chamber 21 of each diaphragm valve 13 is filled with air, and the air is further supplied to the first air chamber 19 and the control air pipe 15 through the secondary air passage hole formed in the diaphragm 13b. Be prepared for blockages to occur. At this time, as mentioned above, the tip of the secondary air pipe 7 is closed, so as shown by the solid line in FIG. 8(a), the secondary air pipe 7
The pressure of the secondary air 10 within the transport pipe 5 uniformly rises to the supply pressure via the regulator 36B from the transport air source 35, and when no blockage occurs within the transport pipe 5, the secondary air 10 is
It only fills the secondary air pipe 7 and each diaphragm valve 13 and is not consumed.

In this way, while the powder and granular material 6 stored in the blow tank 2 is being transported through the transport pipe 5 to the stock tank 3, as shown in FIG. If this occurs, the blockage caused by the plug 27 is automatically cleared by the blockage clearing mechanism 9 provided in the transport pipe 5, as described below.

That is, as shown in FIG. 3, when a plug 27 that causes a blockage occurs in the transport pipe 5, the transport air 23 is transported from the blow tank 2 together with the powder and granules 6 despite the occurrence of the plug 27. Since it continues to be supplied into the tube 5, as shown in Fig. 8 (
In a), as shown by the dotted chain line, the pressure inside the pipe on the upstream side (blow tank 2 side) of the blockage point P, that is, on the left side of FIG. 3, increases rapidly. Then, as shown in FIG.
and a distance L1 in the direction of arrow C from the control air blockage position P1.
It is pressed against the pressing force of the spring 11c in the direction of the arrow, and is positioned at the control air release position P2. In this way, the diaphragm l1g moves to the control air release position P
2, as mentioned above, the control air circulation space 17, which until then was in communication only with the outside of the main body 11a via the control air outlet 11m, becomes the control air inlet 11k.
The secondary air 10, which is also in communication with the control air pipe 15 through the control air pipe 15 and is supplied to the control air pipe 15, is connected to the control air intake port 11k,
The air is vigorously discharged to the outside of the main body 11a of the pressure sensor 11 via the control air circulation space 17 and the control air discharge port 11m. As a result, as shown in FIG.
A part of the secondary air 10 passes through the secondary air passage hole formed in the diaphragm 13b and enters the first air chamber 19, but most of the remaining secondary air 10 passes through the secondary air passage hole formed in the diaphragm 13b.
b is pressurized toward the first air chamber 19, that is, in the direction of arrow E.

Then, the diaphragm 13b moves away from the end of the partition wall 13c against the elasticity of the spring 13d shown in FIG. 6, and deforms into a dish shape protruding in the direction of arrow E, as shown in FIG. The dish-shaped diaphragm 13b and the partition wall portion 13c
An annular secondary air flow path 25 is formed between the end portion of the annular air passage 25 and the end portion of the annular air passage 25 . In this way, when the secondary air flow path 25 is formed between the diaphragm 13b and the partition part 13c, the diaphragm valve 1
Most of the secondary air 10 filling the third air chamber 21 of No. 3 passes through the secondary air flow path 25 and flows into the second air chamber 20
further flows into the secondary air outlet 13f and the air supply pipe 1.
6 to all check valves 12 of the deocclusion mechanism 9.

In this way, when the secondary air 10 is supplied to each check valve 12, the secondary air 10 passes through the four secondary air outlets 22C from within the main body 22a of the check valve 22 shown in FIG. It is sprayed onto the sleeve 22d from the inside. Then, as shown in FIG. 3, the cylindrical rubber sleeve 22d, which had been in close contact with the circumferential surface of the main body 22a of the check valve 22 so as to close the secondary air outlet 22c, releases the secondary air. 10
It deforms into a barrel shape due to the pressure of , and forms a gap 26 between it and the peripheral surface of the main body 22a. Then, the secondary air 10 enters the casing 1 of the check valve 12 with force from the formed gap 26.
The air flows into the secondary air circulation space 39 in the air 2a, and is vigorously ejected into the transport pipe 5 via the secondary air outlet 12b.

In this way, when the secondary air 10 is forcefully blown out from each check valve 12 into the transport pipe S, as shown in FIG. 27 and destroys it. Plug 27 by this secondary air 10
The destruction operation continues as long as the pressure inside the transport pipe 5 upstream of the plug 27 does not decrease to the normal transport pressure of the powder and granular material 6, so the destruction operation completely eliminates the blockage. . In this way, when the plug 27 is destroyed by the secondary air 10 and the blockage is eliminated, the inside of the transport pipe 5 returns to the original transport pressure, as shown by the solid line in FIG. 8(a), and accordingly, As shown in FIG. 2, the diaphragm l1g of the pressure sensor 11 provided upstream of the plug 27 of the transport pipe 5 moves from the control air release position P2 shown in FIG. 5 to the original control air blockage due to the elasticity of the spring llc. Position P
1, the plunger llb slides a distance L1 in the direction of the arrow. Then, until then, the pressure sensor 11 is
The control air pipe 15 that was being vigorously discharged outside the main body 11a of the
As shown in FIG. 4, the secondary air 10 inside is prevented from flowing into the control air distribution space 17 by the sealed space 40 formed between the ○ rings 11i and lli of the plunger llb, and is prevented from flowing into the control air pipe 15. pressure increases. Control air pipe 15
When the pressure inside increases, the inside of the first air chamber 23-24- of the diaphragm valve 13 communicating with the inside of the control air pipe 15 is also pressurized, and this pressure causes the plate to move in the direction of arrow E in FIG. The diaphragm 13b, which had been moved and deformed in the same manner, is pressed in the direction of arrow F by the pressing force of the spring 13d. Then, the diaphragm 13b comes into contact with the end of the partition wall 13c, and the annular secondary air flow path 25 that was previously formed between the end of the partition wall 13c and the dish-shaped diaphragm 13b is closed. Ru.

In this way, the second air chamber 20 and the third air chamber in the diaphragm valve 13
When the secondary air flow path 25 that communicates the air chamber 21 is blocked, air flows from the third air chamber 21 through the secondary air flow path 25 to the second air chamber 21.
The secondary air 10 that had been flowing into the air chamber 20 is prevented from flowing into the second air chamber 20 due to the blockage of the secondary air flow path 25, as shown in FIG. As a result of blocking the secondary air 10 from flowing into the second air chamber 20, the second air chamber 20 and the air supply pipe 1
6 is reduced in pressure, and the supply of secondary air 1o to check valve 12 is stopped. Then, the rubber sleeve 22d, which had been deformed into a barrel shape due to the pressure of the secondary air 10, returns to its original state as shown in FIG. As shown in FIG. 2, the secondary air 10 flows into the secondary air circulation space 39 in the check valve 12, and further
The injection of air into the transport pipe 5 via the secondary air discharge port 12b is stopped. In addition, at this time, the rubber sleeve 22d of the check valve 12
As described above, since the secondary air outlet 22c is closed, the powder 6 in the transport pipe 5 will not flow back into the secondary air pipe 7 via the check valve 12. Suppose that a small amount of powder or granular material 6 touches the main body 22a of the check valve 22 and the rubber sleeve 2.
2d, the rubber sleeve 22d deforms according to the shape of the main body 22a to which the powder/granular material 6 is attached, so that the secondary air outlet 22c is kept closed, and therefore the powder/granular material 6 is clogged. Backflow into the secondary air pipe 7 cannot occur.

In this way, it is transported from the check valve 12! Secondary air 1 into I5
When the jetting of 0 has stopped, the inside of the transport pipe 5 returns to the normal transport state, and on the other hand, the secondary air 10 supplied to the secondary air pipe 7 is filled with powder particles as shown in FIG. It is supplied to the first and third air chambers 19 and 21 in the diaphragm valves 13 of all the blockage clearing mechanisms 9 of the body transport device 1, and into the control air pipe 15, so that whenever a blockage occurs in the future, it will immediately eliminate the blockage. This is a situation that can be resolved.

Note that this blockage elimination mechanism 9 is activated only by an increase in the pressure inside the pipe on the upstream side of the plug 27 of the transport pipe 5.
Unlike the differential pressure detection type blockage resolving mechanism 9 shown in FIG. It can exhibit the function of resolving blockages. For example, even if a blockage occurs just before the stock tank 3, the pressure inside the pipe upstream from the point P where the blockage occurs will necessarily rise, as shown by the dashed line in FIG. 8(b). The pressure sensor 11
can be captured reliably, and the blockage resolving function will be demonstrated.

In this way, while stable powder transport is being carried out while effectively eliminating blockages that may occur in the transport pipe 5 at any location, if one of the plurality of blockage eliminating mechanisms 9 One piece, for example, the most upstream blockage resolving mechanism 9 shown in FIG.
If the secondary air 10 leaks in A, please refer to Fig. 8 (C
), the pressure inside the secondary air pipe 7 on the downstream side of the blockage release mechanism 9A only decreases by the leakage amount, and even if blockage occurs in this state, To-
As shown by the dotted chain line, the pressure inside the pipe upstream from the point P of blockage rises, so the pressure sensor 11 can immediately detect this rise, without adversely affecting the blockage resolving function. Note that the operating pressure of each pressure sensor 11 can be set to an arbitrary value by appropriately adjusting the pressing force adjustment screw llf.

In addition, in the above-mentioned embodiment, as shown in FIG.
As the blockage release mechanism 9, a structure in which three check valves 12 are connected between a diaphragm valve 13 and a transport pipe 5 is used.
The present invention provides a check valve as long as it is properly connected between the diaphragm valve 13 and the transport pipe 5, that is, in such a way that the secondary air 10 is supplied only in one direction from the diaphragm valve 13 to the transport pipe 5. 127 28-2 may be used as the blockage resolving mechanism 9, and the required number of check valves 12 may be determined according to the difficulty of blockage occurrence based on the attributes of the powder or granular material 6 to be transported and the transport conditions. can only be used.

(g) As described in detail in 1 of the invention, according to the present invention, the transport pipe has a transport gas supply source such as the transport air source 35 and is capable of transporting the granular material 6 to the transport gas supply source. Powder transport device 1 connected to 5
, an injection gas supply pipe such as a secondary air pipe 7 is attached to the transport pipe 5 with one end connected to the transport gas supply source and the other end closed, and a pressure sensor 11 is attached to the transport pipe 5. In addition to being provided so as to be freely driven by the pressure within the transport pipe 5, a gas injection means such as a check valve 12 may be provided in the transport pipe 5 to supply injection gas such as secondary air 10 to the transport pipe 5 only in one direction. A control valve such as a diaphragm valve 13 is provided between the injection gas supply pipe and the gas injection means so that it can be opened and closed in response to the operation of the pressure sensor 11. If a blockage occurs in the transport pipe 5 due to the plug 27 during transport using the pipe 5, pressure increase in the transport pipe 5 on the upstream side of the plug 27 causes the pressure sensor 1 to
1 and the control valve operate, and accordingly, the injection gas in the injection gas supply pipe is injected into the transport pipe 5 via the control valve and the gas injection means, and directly hits the plug 27 in the transport pipe 5. I can do it. Therefore, it is possible to effectively eliminate clogging of the transport pipe 5 that tends to occur due to low-speed, high-concentration transport of the powder or granular material 6. Furthermore, since the injection gas is only supplied into the transport pipe 5 when the transport pipe 5 is blocked, and the injection gas is not consumed during normal transportation, there is no need to constantly supply the injection gas. The gas supply source can be small, and unlike electrical blockage clearing methods, there is no need for electrical circuits or wiring work to transmit electrical signals, which reduces the cost of introducing the blockage clearing system. You can. Furthermore, even if a leak occurs in the secondary air 10, the pressure of the secondary air 20 simply decreases downstream from the leak site, and this does not affect the operation of the pressure sensor 11, which is activated only by the pressure inside the transport pipe 5. This makes it possible to effectively demonstrate the blockage resolving function.

In addition, a control valve such as a diaphragm valve 13, a pressure sensor 11, etc.
and 2 provided downstream of the transport pipe 5 of the pressure sensor 11.
Blockage release mechanism 9 consisting of a jet gas supply pipe such as a secondary air pipe 7
If two or more are provided along the transport pipe 5, as shown in FIG.
No matter where the blockage occurs in the B direction, the blockage resolving function can be equally effective.

In addition, as the pressure sensor 11, depending on the pressure inside the transport pipe 5,
A valve element such as a plunger Ilb that is driven to move between at least a first position such as a control air closing position MP1 and a second position such as a control air release position P2 is provided, and when the pressure inside the transport pipe 5 is low, the valve element is provided. When the element is in the first position, it outputs a signal to close the control valve such as the diaphragm valve 13, and when the pressure inside the transport pipe 5 is high and the valve element is in the second position, the control valve is opened. When configured using a device characterized by forming signal output means such as a narrow diameter portion 11h, a control air intake port 11k, and a control air discharge port 11m for outputting a signal, the transport pipe 5 due to the occurrence of blockage The valve element is driven to move from the first position to the second position by the increase in pressure inside, and accordingly, a signal is outputted to the control valve by the signal output means, and as a result of opening the control valve, the injected gas The injection gas in the supply pipe is injected into the transport pipe 5 through the control valve and the gas injection means, and can directly hit the plug 27 in the transport pipe 5. Therefore, it is possible to effectively eliminate clogging of the transport pipe 5 that tends to occur due to low-speed, high-concentration transport of the powder or granular material 6.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the powder transport device according to the present invention, FIG. 2 is a front cross-sectional view of the vicinity of the blockage resolving mechanism of the powder transport device shown in FIG. 1, and FIG. 2 is a front sectional view showing an example of the state of the blockage clearing mechanism when it is activated; FIG. 4 is an enlarged sectional view of a pressure sensor in the blockage clearing mechanism shown in FIG. 2; and FIG. Figure 6 is an enlarged cross-sectional view of the diaphragm valve in the blockage resolving mechanism shown in Figure 2, and Figure 7 is an enlarged cross-sectional view of the check valve in the blockage resolving mechanism shown in Figure 2. Figure 8 is a graph showing the distribution of the pressure inside the pipes in the transport direction during normal transport and when blockage occurs in the transport pipe and secondary air pipe that constitute the powder transport device shown in Fig. 1. A diagram illustrating a conventional method for eliminating blockage when transporting powder or granular material by air. Figure 10 shows the normal transportation and occurrence of blockage in the transport pipe and secondary air pipe that make up the powder or granular transport device shown in Fig. 9. 3 is a graph showing the distribution of the pressure inside the pipe in the transport direction at 5... Transport pipe 6... Powder 7... Injection gas supply pipe (secondary air pipe) 9...
... Blockage release mechanism 10 ... Injected gas (secondary air) 11 ...
・Pressure sensor

Claims (3)

[Claims] (1) A powder and granular material transport device having a transport gas supply source and having a transport pipe capable of transporting the powder and granular material connected to the transport gas supply source, wherein an injection gas supply pipe is connected to the transport pipe, and one end of the transport pipe is connected to the transport pipe. connected to the transport gas supply source and installed with the other end closed, a pressure sensor provided on the transport pipe so as to be freely driven by the pressure within the transport pipe, and a gas injection means connected to the transport pipe to the transport pipe. Transporting powder and granular materials, which is provided in a form that can supply injected gas only in one direction, and a control valve is provided between the injected gas supply pipe and the gas injection means so that it can be opened and closed in response to the operation of the pressure sensor. Device. (2) Claim 1, wherein two or more blockage elimination mechanisms are provided along the transport pipe, each consisting of a control valve, a pressure sensor, and an injection gas supply pipe provided downstream of the pressure sensor in the transport pipe. The powder transport device described in Section 1. (3) The pressure sensor is provided with a valve element that is driven to move between at least a first position and a second position by the pressure inside the transport pipe, and when the pressure inside the transport pipe is low, the valve element is in the first position. The present invention is characterized by forming a signal output means for outputting a signal for closing the control valve at certain times, and for outputting a signal for opening the control valve when the pressure inside the transport pipe is high and the valve element is in the second position. A powder transport device according to claim 1 or 2.