JPH0219054B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a transport pipe and an auxiliary conduit that is installed in parallel with the transport pipe and introduces an auxiliary gas into a part of the transport pipe where the powder or granular material is clogged. This invention relates to a device that pneumatically conveys powder or granular material (material) without clogging.

[Conventional technology]

Conventionally, devices for pneumatically transporting powder and granular materials without clogging include (a) the device described in Japanese Patent Publication No. 1983-6153, (b) the device described in Japanese Utility Model Publication No. 48-43593, and (c) the device described in Japanese Utility Model Publication No. 1987-43593. The following are known: (d) the one described in JP-A-57-121530, and (e) the one described in JP-A-52-79494.

Conventional example (a) uses a transport pipe and an auxiliary pipe, in which the auxiliary gas is extracted from the carrier gas flow before the point where the material is introduced into the transport pipe, and the pressure course in the auxiliary pipe is monitored to prevent stagnation. Due to the pressure difference created between the auxiliary conduit and the transport pipe due to the pressure drop that occurs behind the material stagnation point in the transport pipe, the pressure difference between the auxiliary conduit and the transport pipe is In addition to the transport pipe and the auxiliary pipe, the device includes means for adjusting the pressure course in the auxiliary pipe to the desired pressure course in the transport pipe, and the transport pipe and the auxiliary pipe. and a check valve installed at the connection point of the transport pipe, which prevents the check valve from opening toward the transport pipe due to the pressure difference that occurs between the auxiliary pipe and the transport pipe when the transport pipe becomes clogged with material. This is a characteristic feature.

Conventional example (b) has pressure detection ends at the front and rear of the clogged part of the material, as well as a differential pressure detector that detects the differential pressure between the two, and when the differential pressure exceeds a certain value. When this happens, the valve opens to supply auxiliary gas to the transport pipe.

In conventional example (c), when material clogs at a predetermined point in the transport pipe, the internal pressure in the pressure tank increases through the transport pipe, and when this internal pressure rises above a certain value, the material is attached to the pressure tank. The pressure switch detects this and transmits it to the electromagnetic on-off valve through the control panel, and the electromagnetic on-off valve is immediately opened. When the on-off valve is opened, the gas conduit passage of the branch pipe corresponding to the auxiliary conduit is opened, and the auxiliary gas is supplied to each of the compressed air injection mechanisms, and the flow rate is adjusted by the pre-adjusted flow rate adjustment valve. It is configured to be supplied to the clogged part of the transport pipe.

In the conventional example (d), pressure detectors, which are electrical pressure signal generators that are activated by the pressure drop occurring behind the clogged part of the transport pipe, are installed in multiple pipe areas of the transport pipe, and this pressure The detector is connected to an electronic control unit, and the electronic control unit compares the input signal from the pressure detector with a signal previously input as a target value, sends the output signal to the flow control valve, and controls the flow rate. The auxiliary gas from the auxiliary conduit is adjusted by the amount of opening and closing of the valve, and is simultaneously supplied to the clogged location of the transport pipe from two or more auxiliary gas branch pipes.

Conventional example (e) is an improved technology of conventional example (a), in which the auxiliary conduit is controlled by a large number of shutoff valves arranged at intervals in response to the pressure difference between the auxiliary conduit and the transport pipe. The pipe is divided into a number of pipe segments, and each pipe segment is connected to the transport pipe at a number of points via flow valves. Auxiliary gas is simultaneously supplied from the passage to the blockage in the transport pipe via the flow valve. In this case, the shutoff valve is
In order to prevent auxiliary gas from being supplied from all the auxiliary conduits after the material clogging point, which would be uneconomical in terms of air supply efficiency, the structure is such that the auxiliary conduit line immediately downstream of the clogging point in the transport pipe is shut off. It is something.

[Problem to be solved by the invention]

However, in all of the above conventional examples (a), (b), (c), (d), and (e), the auxiliary gas from the auxiliary conduit is simultaneously supplied to the powder in the transport pipe via the auxiliary gas supply branch pipe. Although it is possible to supply the auxiliary gas to the clogged part of the powder, there is no distributor installed in the auxiliary gas flow path, so it is not possible to selectively supply the auxiliary gas to the part of the clogged part of the granule. Since the auxiliary gas cannot be supplied in an overlapping manner beyond the internal pressure detection pipe area, it is difficult to efficiently eliminate the part where the powder or granular material is clogged.

Conventional examples (a), (b), (c), (d), and (e) each have their own unique problems as described below in addition to the above problems.

The conventional example (a) above is: (a) The pressure profile in the auxiliary pipe is matched to the pressure profile in the transport pipe that occurs during unrestricted pneumatic delivery. Since the auxiliary gas is taken out from the carrier gas flow at the front, if there is no stagnation in the transport pipe, the pressure course in the transport pipe and the pressure course in the auxiliary pipe will be exactly the same, and the pressure in both will be the same. It is not possible to set the pressure profiles independently of each other. In other words, when a stagnation point occurs in the transport pipe, there is a drawback that it is not possible to supply auxiliary gas at a pressure different from the gas pressure of the transport pipe from the auxiliary conduit according to the degree of stagnation.

(b) It also allows auxiliary gas to flow from the auxiliary pipe into the transport pipe based on the pressure drop that occurs behind the material stagnation point in the transport pipe, that is, the pressure difference created between the auxiliary pipe and the transport pipe. Therefore, a detection means provided with a threshold value is required, which detects this only when the pressure difference reaches a certain value or more.

(c) Furthermore, given the above configuration, a pressure difference will occur between the auxiliary conduit and the transport pipe at all connection points after the material stagnation point, and if no measures are taken, the auxiliary conduit side will be affected at these connection points. This results in unnecessary inflow of auxiliary gas from the auxiliary gas, which is uneconomical in terms of air supply efficiency. Therefore, in this one,
In addition to a check valve that detects the pressure difference and introduces auxiliary gas from the auxiliary conduit to the transport pipe, additional auxiliary means such as a shutoff valve are installed to prevent unnecessary auxiliary gas from flowing past the stagnation point. There are inconveniences such as the need to do so.

In conventional example (b), (a) The pressure detection end at the rear of the material clogging area detects an increase in internal pressure, but this alone cannot achieve the purpose; the pressure detection end at the front detects a drop in internal pressure. Not only is it necessary as a pair, but also a differential pressure detector that discards the differential pressure between both pressure detection ends is essential, which inconveniently increases the number of components.

(b) Furthermore, the system detects the pressure difference before and after the clogging part of the material and opens the auxiliary gas supply valve when the pressure difference exceeds the set pressure difference (threshold value). Similar to example (a) and (b), there are problems such as the need for a differential pressure detector as a detection means provided with a threshold value.

Conventional example (c) is: (a) A pressure switch detects the increase in internal pressure in the pressure tank before supplying auxiliary gas to the transport pipe, so if the transport pipe becomes long, the internal pressure will rise from the clogged area. As the distance to the pressure tank that detects the increase in pressure becomes longer, the time to detect the increase in internal pressure becomes slower, and the responsiveness of the operation of supplying auxiliary gas to clear the blockage, that is, the dynamic characteristics, deteriorates accordingly. As a result, it is too late to supply auxiliary gas to the clogged area, making it impossible to clear the blockage. This has been proven through experiments by the inventors of the present application.

(b) Also, in this case, the maximum flow rate of auxiliary gas is flowed from the branch pipe connected to the air source.
The operation of the pressure switch determines whether or not auxiliary gas is necessary, and the on-off valve is opened and closed. Since this on-off valve does not adjust the flow rate of the auxiliary gas in any way, the flow rate of the auxiliary gas is allowed to flow in the auxiliary conduit at its maximum state, and the flow rate adjustment valve of the compressed air injection mechanism restricts the upper limit to the maximum flow rate. It is. That is, in the auxiliary conduit in this case, the flow rate of the auxiliary gas is always at a maximum, and the flow rate of the auxiliary gas can be throttled within the range of this maximum value via the flow rate regulating valve. Therefore, in this case, since the auxiliary gas is flowed at the maximum flow rate up to the flow rate adjustment valve, the supply of the auxiliary gas is wasteful. Furthermore, a flow rate regulating valve must be individually provided for each compressed air injection mechanism, which has the disadvantage of increasing the number of components.

In conventional example (d), (a) As described in (c) of conventional example (a), there is a pressure difference between the auxiliary pipe and the transport pipe at all connection points after the material stagnation point. If no measures are taken, auxiliary gas will wastefully flow in from the auxiliary conduit side at these connection points, which will be uneconomical in terms of air supply efficiency.

(b) In addition, in this device, the pressure signal generator, which is a pressure detector, and the flow control valve are installed separately and in separate locations, and the pressure signal generator and flow control valve are connected to the electronic control unit by a transmission line. Since it has to be connected to the main body, there are many component parts, and the work of installing each of these parts is not only time-consuming but also troublesome.

Conventional example (e) has (a) a shutoff valve and a separate flow valve, so there are many components, and the work to install them is time-consuming and troublesome.

(b) The shutoff valve is only intended to shut off the auxiliary conduit line immediately downstream of the clogged point in the transport pipe, and to supply auxiliary gas to the flow valve only upstream of the shutoff valve. Since the valve itself does not adjust the amount of auxiliary gas to supply auxiliary gas to a clogged location in the transport pipe, there is a problem in that in addition to the cutoff valve, a large number of flow valves are required for each branch pipe.

This invention completely eliminates all of the above-mentioned problems in the conventional example, and makes it possible to set the pressure course of the auxiliary conduit completely independently of the pressure course of the transport pipe, and also to control the supply amount of the auxiliary gas. It greatly reduces the pressure, improves economic efficiency, and quickly detects the rise in internal pressure that occurs in front of the clogged part of the powder or granular material (material) in the transportation pipeline, improving the responsiveness, or dynamic characteristics, of the auxiliary gas supply. It is an object of the present invention to provide an apparatus for pneumatically conveying powder or granular material (material) without clogging, which can quickly eliminate clogging of the material.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a transport pipe for pneumatically transporting powder and granules, an auxiliary conduit that is installed in parallel with the transport pipe and guides an auxiliary gas to eliminate clogging of the powder and granules in the transport pipe, and A pressure detector that detects the pressure in a predetermined area of the pipe, a flow control valve that adjusts the amount of auxiliary gas supplied from the auxiliary conduit according to the amount detected by this pressure detector, and a In an apparatus for pneumatically conveying powder or granular material without clogging, the pressure detector is equipped with two or more branch pipes for auxiliary gas, and the pressure detector detects the internal pressure occurring in front of a part of the transport pipe where the powder or granular material is clogged. The flow rate control valve includes a valve box having a pipe constituting a part of the auxiliary gas supply pipe connected to the auxiliary pipe at appropriate intervals, and a pipe line. It consists of a lid body having a needle valve body that opens and closes midway through the valve, and a yoke connected to the lid body and having a stem that is connected to the needle valve body and biases the needle valve body toward the closing side with a spring. A diaphragm is provided in the cavity of the box covered with the upper end of the yoke, and the diaphragm is connected to the stem, and the air passage formed in the upper end of the yoke and communicating with the cavity is pressurized. By connecting to the detection ventilation pipe, the empty chamber is communicated with the transport pipe, and the other end of the auxiliary gas supply pipe connected to the flow rate control valve is connected to a distributor consisting of a solenoid valve, etc. The branch pipes are arranged at appropriate intervals behind the internal pressure detection pipe area of the transport pipe via the distributor and after the next internal pressure detection pipe area, and the auxiliary gas is supplied from these branch pipes simultaneously or selectively. It is configured to be supplied to a part of the transport pipe that is clogged with powder or granular material.

In addition to using a solenoid valve as the distribution pipe, a limit switch may be attached to the spring receiving member in the yoke of the flow control valve and the inner wall of the yoke, and the distributor may be linked to the limit switch.

[Effect]

According to the present invention having the above configuration, if the powder or granular material is being transported within the transport pipe without clogging, the pressure detector will not detect an increase in the internal pressure of the transport pipe. Even if gas is supplied, the flow rate control valve also remains closed, and auxiliary gas is not supplied to the transport pipe.

On the other hand, if the powder or granule in the transport pipe becomes clogged (for example, as indicated by T in Figure 1), the part where the powder or granule is clogged T
A pressure detector installed in front of the clogged portion T detects an increase in the internal pressure of the transport pipe that occurs at the front of the pipe. In this case, the pressure detector detects the increase in internal pressure immediately in front of the clogged portion T, so it has excellent responsiveness so that the increase in internal pressure can be quickly detected and the auxiliary gas can be supplied immediately.

The flow rate control valve is integrated with the pressure detector, and the needle valve body finely adjusts the pipe line in the valve box according to the amount detected by the pressure detector, so the amount of auxiliary gas supplied from the auxiliary conduit can be finely adjusted. The finely adjusted auxiliary gas is simultaneously or selectively supplied to the transport pipe from a branch pipe connected behind the predetermined pipe area of the transport pipe and after the next internal pressure detection pipe area through a distributor. The powder is supplied to the clogged part of the powder and granules to eliminate the blockage. In this case, because of the above configuration, there is no wasted supply of auxiliary gas, and the clogging removal effect is excellent.

The time for clearing the part of the powder blockage may be set using a timer or the like. When the clogging of the powder and granular material is cleared and the set time period ends, the distributor etc. stop operating and return to the original normal transport state. Note that the auxiliary gas can be supplied to the branch pipe selectively using a distributor, or can be supplied sequentially, and is optional.

〔Example〕

A first embodiment of the invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a transport pipe for pneumatically transporting powder and granular materials using gas such as air or nitrogen, and the base end of this transport pipe 1 is connected to a pressurized tank 4 via a connecting pipe 2 and a mixer 3. . A carrier gas from an air source 6 such as a compressor or blower is introduced into the connecting pipe 2 and the mixer 3 via a gas supply pipe 5, and the powder particles fed into the pressurized tank 4 from the material supply hopper 7 are fed into the connecting pipe 2 and the mixer 3. The bodies are mixed with a carrier gas and sent under pressure to the transport pipe 1, and then transported to a destination such as a synthetic resin molding machine or a mixing tank via a collection container (not shown) connected to the tip of the transport pipe 1.

8 is a valve, 9 is a shutter, 10 is an upper limit level meter, and 11 is a lower limit level meter. Valve 8 and shutter 9 operate alternately to supply material to the pressurized tank 4, and are linked to the upper limit level 10. Then, the supply operation is stopped, and the supply operation is restarted in conjunction with the lower limit level meter 11. However, the specific structure for pneumatically transporting the powder and granular material to the transport pipe 1 is not limited to that of the above embodiment, and the design can be changed as appropriate.

The transport pipe 1 is juxtaposed with an auxiliary conduit 20 to which auxiliary gas is supplied from an air power source 6a separate from the above-mentioned air power source 6.
By introducing the auxiliary gas from 0 to the part where the powder or granular material in the transport pipe 1 is clogged, the clogging of the powder or granular material in the transport pipe 1 is released, as will be described later.
Note that the pneumatic power source for the auxiliary conduit 20 is not provided separately as in the embodiment, but can also be used as the pneumatic power source 6 for the transport pipe 1. For example, the air power source 6 is branched into the transport pipe 1 and the auxiliary pipe 20 via the control panel, and pressure regulators are attached to both branch pipes to supply different gas pressures to the transport pipe 1 and the auxiliary pipe 20. You can also.

Auxiliary pipe bodies 21a...21a to which a pressure detector 23 for detecting an increase in internal pressure that occurs in front of a clogged part of powder or granular material in a predetermined pipe area (transport pipe internal pressure detection pipe area 21) in the material flow direction of the transport pipe 1 is connected. A plurality of auxiliary pipe bodies 21a...21a are used to connect the transport pipe 1 and the pressure detection vent pipe 22, and the other end of the pressure detection vent pipe 22 is connected to the pressure detector 23. Then, the pressure detector 23 detects an increase in the internal pressure in a predetermined pipe area of the transport pipe 1. This pressure detector 23 is integrally provided with a flow rate control valve 24 that adjusts the amount of auxiliary gas supplied from the auxiliary conduit 20 in accordance with the detected amount.

The flow rate control valve 24 includes a valve box 26 having a conduit 26a forming a part of an auxiliary gas supply pipe 25 connected to the auxiliary conduit 20 at appropriate intervals, and a needle valve body 27 that opens and closes the middle of the conduit 26a. a yoke 3 connected to the lid 28 and having a stem 30 connected to the needle valve 27 and urging the needle valve 27 toward the closing side by a spring 29;
It consists of 1.

The pressure detector 23 is provided with a diaphragm 34 in a cavity 33 of a box 32 covered with the upper end of the yoke 31, and the diaphragm 34 is connected to the stem 30. Ventilation path 3 communicating with the empty chamber 33
By connecting 1a to the pressure detection vent pipe 22, the empty chamber 33 is communicated with the transport pipe 1.

Therefore, when the pipeline of the transport pipe 1 becomes clogged with powder or granular material, the diaphragm 34 rises as the internal pressure of the transport pipe 1 increases, causing the stem 30 to rise against the bias of the spring 29. Thereby, the degree of opening of the pipe line 26a by the needle valve body 27 is increased, and the branch pipes 36...36' are passed from the auxiliary pipe 20 through the distributor 35.
The supply flow rate of the compressed gas introduced into the transport pipe 1 is increased. The opening degree setting of the pipe line 26a for a predetermined internal pressure of the transport pipe can be adjusted by changing the strength of the spring 29 according to various characteristics of the pipe area to which it is attached and the characteristics of the powder or granular material to be applied. can.

A distributor 35 made of a solenoid valve or the like is connected to the other end of the auxiliary gas supply pipe 25 connected to the flow rate control valve 24, and the internal pressure detection pipe area of the transport pipe 1 is connected to the distributor 35 through the distributor 35. (that is, in this embodiment, between the auxiliary pipe body 21a and the next auxiliary pipe body 21a) and the next internal pressure detection pipe area,
Two or more branch pipes 36...36' at appropriate intervals
are connected via check valves 37, respectively.

In this embodiment, a solenoid valve is used as the distributor 35, so a limit switch 39 is attached to the spring receiving member 38 in the yoke 31 of the flow rate control valve 24 and the inner wall of the yoke 31. When the limit switch 39 is turned on by the upward movement of the stem 30, the solenoid valve is activated and the auxiliary gas introduced from the auxiliary gas supply pipe 25 through the flow rate control valve 24 flows into the branch pipe 36. …36'
The particles are simultaneously or selectively introduced into the clogged part of the transport pipe 1 through the granules. In this case, if a timer (not shown) is connected so that it operates when the limit switch 39 is on, auxiliary gas is supplied into the transport pipe 1 for a set time.
Further, the limit switch 39 can be provided so that its operation can be adjusted, or a plurality of limit switches 39 can be provided at different positions.

Note that an auxiliary pipe body 2 is provided in the transport pipe internal pressure detection pipe area 21.
It is also possible to directly attach the pressure detector 23 and flow control valve 24 as a single unit without attaching 1a.

Also, a check valve 37 is installed in the middle of the branch pipes 36, 36'.
It can also be applied to items that do not have a Branch pipe 36
It is also possible to attach a known pressure nozzle to the corresponding transport pipe 1 and connect this pressure nozzle to the branch pipe. Furthermore, the number of branch pipes 36 is arbitrary. 40 is a pressure regulator.

To explain the operation of this embodiment, if the powder is being transported through the transport pipe 1 without clogging, the pressure detector 23 will not detect an increase in the internal pressure of the transport pipe. Even if the auxiliary gas is supplied, the limit switch 39 does not operate, the flow rate control valve 24 also remains closed, and the auxiliary gas is not supplied to the transport pipe 1.

On the other hand, if the transport pipe is clogged with powder or granules (for example, as shown at T in Figure 1), the increase in internal pressure of the transport pipe that occurs in front of the part T where the powder or granules are clogged can be suppressed. The pressure detector 23 installed in front of the clogged part T detects it, and the upward movement of the diaphragm 34 moves the needle valve body 27 upward to open the pipe line 36a, and the auxiliary gas from the auxiliary conduit 20 is transferred to the auxiliary gas supply pipe. 25 into the branch pipes 36...36'. At this time, the limit switch 39 is turned on, and the switch 39 operates the solenoid valve 35, which serves as a distributor, for the time set by the timer, and the auxiliary gas is supplied to the transport pipe through one or more of the branch pipes 36...36'. 1
The powder flows into the part T where the powder or granular material is clogged, and the clogging of the powder or granular material is cleared. When the clogging of the powder and granular material is cleared and the set time period ends, the distributor 35 and the like stop operating and return to the original normal transportation state.

FIG. 3 shows a second embodiment. In this case, a branch pipe 50 is branched in the middle of the pressure detection vent pipe 22,
The tip of this branch pipe 50 is connected to a distributor 35 consisting of an air-operated valve, and the distributor 35 is operated by the gas pressure from the transport pipe 1 introduced from the pressure detection vent pipe 22 through the branch pipe 50. configured,
This embodiment is characterized in that the limit switch 39 shown in the previous embodiment is not required.

According to such a configuration, the pressure detector 23, the flow rate control 24, and the distributor 35 can all be controlled by gas, so that an accidental explosion that would occur when the limit switch 39 is employed can be prevented. Note that in this case as well, a check valve 37 may be provided as in the previous embodiment.

FIG. 4 shows a third embodiment. This device is characterized in that at least one of the branch pipes branched from the distributor 35 is all connected to the next transport pipe internal pressure detection pipe area 21'.

In other words, the areas covered by the transport pipe internal pressure detection position, that is, to give an example along the diagram, the transport pipe internal pressure detection pipe area 21 and the next transport pipe internal pressure detection pipe area 2.
1', there are branch pipes 36, 36, 3 in the transport pipe 1 between
6, 36, and at least one branch pipe 36' connects the area covered by the next transport pipe internal pressure detection pipe area 21', that is, the next transport pipe internal pressure detection pipe area 21' and the third It is connected to the transport pipe 1 between the transport pipe internal pressure detection pipe area 21'' at the top of the pipe, and such a configuration is also provided in other areas.
51 is a regulator.

According to the configuration in which all of the branch pipes 36 are connected only to the area covered by the transport pipe internal pressure detection pipe area 21,
If the transport pipe internal pressure detection pipe region 21 itself is clogged with powder or granules, the pressure detector 23 cannot be operated via the pressure detection ventilation pipe 22 at that location, so the auxiliary pipe 20 cannot be operated in that region. Branch pipe 36...
There is the disadvantage that auxiliary gas cannot be supplied via 36.

However, according to the configurations shown in FIGS. 1, 3, and 4, the internal pressure of the transport pipe is detected from the front of the transport pipe internal pressure detection pipe area 21, 21', 21'', which is clogged with powder and granules. The auxiliary gas from the branch pipe 36' connected after the detection pipe region can eliminate the clogging of the powder and granules, and the above-mentioned disadvantages can be overcome.

Note that the auxiliary conduit 20 may be completely independent of the transport pipe 1, or may be communicated with the transport pipe 1 near its terminal end.

〔Effect of the invention〕

According to the invention, (1) the pressure detector and the flow rate control valve are integrally provided, that is, the flow rate control valve constitutes a part of the auxiliary gas supply pipe connected to the auxiliary conduit at appropriate intervals; a valve box having a conduit to open and close the conduit, a lid body having a needle that opens and closes the conduit midway, and a stem connected to the needle valve body and urging the needle valve body toward a closing side with a spring, and connected to the lid body. The pressure sensor has a diaphragm provided in a hollow part of a box covered with the upper end of the yoke, and this diaphragm is connected to the stem. Conventional examples (d) and (e)
There are fewer component parts compared to
Installation of these component parts is simple and easy. There is no need to separately provide a large number of shutoff valves and flow valves as in the conventional example (e).

(2) Moreover, the pressure detector and flow control valve are integrated, and the pressure detector detects the increase in internal pressure in front of the part where the powder or granular material is clogged in the transport pipe, and controls the flow rate according to the detected pressure amount. The valve adjusts the amount of auxiliary gas supplied from the auxiliary conduit, and if the predetermined pipe area where the particulate matter is clogged is not clogged with particulate matter, the needle valve body of the flow control valve shuts off the auxiliary gas flow path. Because it also has the role of
This eliminates the drawback of supplying auxiliary gas to areas other than the part where the powder or granular material is clogged, as in conventional examples (a) and (d).

(3) In the present invention, since the pressure detector detects the pressure rise that occurs in front of the part of the transport pipe that is clogged with powder or granular material, the internal pressure rise can be quickly detected, and the auxiliary gas can be supplied. Because of its extremely excellent responsiveness, or dynamic characteristics, it has the remarkable effect of efficiently clearing material blockages in any case, such as in long transportation pipes.

(4) In the present invention, a distributor consisting of a solenoid valve is connected to the other end of the auxiliary gas supply pipe connected to the flow rate control valve, and a distributor is connected to the rear of the internal pressure detection pipe area of the transport pipe via the distributor. Since the branch pipes are arranged at appropriate intervals after the next internal pressure detection pipe area, it goes without saying that these branch pipes can simultaneously supply powder and granular material to multiple clogged parts of the transport pipe. In addition, auxiliary gas can be supplied selectively depending on the degree of clogging, and auxiliary gas can also be supplied in an overlapping manner to the next internal pressure detection pipe area of the transport pipe, making it possible to efficiently eliminate particulate material clogging. Can be done.

In other words, in conventional examples (a), (d), and (e), where the auxiliary gas is simultaneously supplied to multiple locations in the part where the powder or granular material is clogged, it Although the auxiliary gas is supplied well, it is difficult to supply the auxiliary gas to areas where there is a lot of clogging, so there is a problem in that the efficiency of clearing the clogging of powder and granular material is not good. On the other hand, with this invention, as mentioned above, the distributor can select a location with a high degree of clogging and supply auxiliary gas intensively and forcibly through the branch pipe, so the above-mentioned difficulties are solved. can.

Moreover, since the branch pipe is arranged to overlap with the next transport pipe internal pressure detection pipe area, as mentioned above, the previous transport pipe internal pressure detection pipe area itself becomes clogged with powder and particles. Branch pipes are useful in cases where increased internal pressure cannot be avoided.

(5) The present invention synchronizes the pressure progression of the transport pipe and the auxiliary pipe as in the conventional example (a), and provides support based on the pressure drop that occurs behind the granular material in the transport pipe when the granular material becomes clogged. Since it does not supply gas, there is no need for a detection means with a threshold that detects it only when the pressure difference between the transport pipe and the auxiliary pipe exceeds a certain value. Since the pressure profile of the auxiliary gas and the auxiliary conduit can be made independent and the pressure of the auxiliary gas from the auxiliary conduit can be supplied differently from the gas pressure of the transport pipe, pressure setting is easy and extremely advantageous in terms of design and operation.

(6) The configuration as described in claim 2 has the advantages described above.

[Brief explanation of drawings]

Each figure shows an embodiment of the present invention, and FIG. 1 is a partially sectional side view of the first embodiment, and FIG. 2 is a sectional view of the pressure detector and flow control valve shown in FIG. 1. , FIG. 3 is a partial side view of the second embodiment, and FIG. 4 is a partial side view of the third embodiment. 1... Transport pipe, 6, 6a... Energy source, 20...
Auxiliary conduit, 21... Transport pipe internal pressure detection pipe area, 22...
...Pressure detection vent pipe, 23...Pressure detector, 24
...flow control valve, 25 ... auxiliary gas supply pipe, 35 ... distributor, 36, 36', 50 ... branch pipe, 37 ... check valve, 39 ... limit switch, T ... powder clogging part.

Claims (1)

[Claims] 1. A transport pipe 1 for pneumatically conveying powder and granules, and this transport pipe 1
an auxiliary conduit 20 that is arranged in parallel with the transport pipe 1 and guides an auxiliary gas to eliminate clogging of powder or granular material in the transport pipe 1; a pressure detector 23 that detects the pressure in a predetermined pipe area of the transport pipe 1; Auxiliary conduit 20 depending on the detected amount of
It is equipped with a flow rate control valve 24 that adjusts the amount of auxiliary gas supplied from the flow rate control valve 24, and two or more branch pipes 36 for auxiliary gas provided from the flow rate control valve 24 toward the transport pipe 1. In the conveying device, the pressure detector 23 detects an increase in internal pressure occurring in front of the part T clogged with powder or granular material in a predetermined pipe area of the transport pipe 1, and is provided integrally with a flow rate control valve 24. 2 includes a valve box 26 having a conduit 26a forming a part of an auxiliary gas supply pipe 25 connected to the auxiliary conduit 20 at appropriate intervals, and a lid body having a needle valve body 27 that opens and closes the middle of the conduit 26a. 28, and a yoke 3 connected to the lid body 28 and having a stem 30 connected to the needle valve body 27 and urging the needle valve body 27 toward the closing side by a spring 29.
1, the pressure detector 23 is provided with a diaphragm 34 in the cavity 33 of the box 32 covered with the upper end of the yoke 31, and the diaphragm 34
is connected to the stem 30, and the air passage 31a formed at the upper end of the yoke 31 and communicating with the air space 33 is connected to the pressure detection air pipe 22, thereby connecting the air space 33 to the transport pipe 1. The other end of the auxiliary gas supply pipe 25 connected to the flow rate control valve 24 is connected to a distributor 35 made of a solenoid valve, etc., and the internal pressure of the transport pipe 1 is detected through the distributor 35. The branch pipes 36...36' are arranged at appropriate intervals behind the pipe area and after the next internal pressure detection pipe area, and the auxiliary gas is simultaneously or selectively supplied to the transport pipe 1 from these branch pipes 36...36'. A device for pneumatically conveying powder or granular material without clogging, characterized in that the device is configured to be supplied to a part T where powder or granular material is clogged. 2. Using a solenoid valve as the distribution pipe 35,
A limit switch 39 is attached to the spring receiving member 38 in the yoke 31 of the flow rate control valve 24 and the inner wall of the yoke 31, and a distributor 35 is linked to the limit switch 39. A device that pneumatically pumps air.