JP2007112563A - Gas pressure detecting device and powdery and granular material transporting device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas pressure detecting device capable of preventing inflow of outside air and promptly detecting pressure fluctuation in a transport condition so as to facilitate adjustment of secondary air, and a powdery and granular material transporting device capable of performing stable transport by using this gas pressure detecting device. <P>SOLUTION: This gas pressure detecting device is provided with a closed body 62 comprising a closed body main part 62A movably inserted into a cylindrical body 61 in which a gas flow is generated and an annular flange part 62B provided in the upper part of the closed body main part 62A and closing an outside air port 61A of the cylindrical body 61 in the transport condition; a fixed shaft 64 facing inside of the cylindrical body 61 and capable of moving the closed body 62 in accordance with pressure fluctuation by the gas flow; and an elastic body 65 energizing the fixed shaft 64 or the closed body 62 to open the outside air port 61A of the cylindrical body 61 in a normal condition. The annular flange part 62B of the closed body 62 resists the energizing force of the elastic body 65 to close the outside air port 61A of the cylindrical body 61 in the transport condition, and opens the outside air port 61A of the cylindrical body 61 by the energizing force of the elastic body 65 in a non-transport condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention detects a pressure fluctuation due to a gas flow as a signal, and sends a gas pressure detection device that sends the detection signal to a device that requires the detection signal, and using this gas pressure detection device, a granular material of a synthetic resin material, etc. The present invention relates to a granular material transport device transported by a gas flow.

  Conventionally, as this kind of granular material transport device and the gas pressure detection device used therefor, those described in Patent Document 1 (Japanese Patent Laid-Open No. 2000-153922) are known. What was described in this patent document 1 is demonstrated below based on FIG. 7 thru | or FIG.

  In FIG. 7, the granular material transport device includes two granular material storage tanks 101 and 101 in which the granular material is stored as a synthetic resin molding material, and an opening and closing device 105 below the granular material storage tanks 101 and 101. , 105 connected to the end of the transport pipe 114, the collector 131 connected to the end of the transport pipe 114 to separate the gas and the granular material, and the internal pressure of the transport pipe 114 through the collector 131 By making the negative pressure, a gas flow of air is generated in the transport pipe 114, and the powder stored in the powder storage tanks 101, 101 is transported by a gas flow to the collector 131 through the transport pipe 114. The suction device 139 is a main component.

  The opening / closing device 105 connected to the lower part of the granular material storage tank 101 is in response to a detection signal of the pressure detection means 112 that detects pressure fluctuation in the transport pipe provided on the start end side of the transport pipe 114. It is connected to a first control device 110 that controls opening and closing of the opening and closing device 105 through a signal line 111A. The opening / closing device 105 is operated by an operating device 109 such as a motor, and the operating device 109 is connected to a first control device 110 having a microcomputer by a signal line 111A.

  The suction device 139 connected to the collector 131 is connected to an operation device 142 such as a motor as a power source for operating the suction device 139. The operation device 142 is connected to the microcomputer via a signal line 111B. Etc. are connected to a second control device 143.

  The collector 131 separates and collects only the granular material from what is pneumatically transported in a state where the granular material in the granular powder storage tank 101 is mixed with the gas and the granular material via the transport pipe 114. The detector 151 which detects the quantity of the granular material stored in the inside is provided.

  The detector 151 is provided opposite to the transparent tube 149 connected to the lower portion of the collector 131, and is connected to the second control device 143 via a signal line 111B.

  Therefore, when the granular material in the collector 131 is consumed and reaches a predetermined amount by a molding machine (not shown) connected to the transparent cylinder 149 below the collector 131, the detector 151 performs the second control. The empty control signal is output to the device 143 through the signal line 111B, and the second control device 143 that has received the detection signal outputs the operation signal to the operating device 142 through the signal line 111B to operate the operating device. 142 is activated. By operating the operating device 142, the suction device 139 reduces the internal pressure in the collector 131 and the transport pipe 114.

  When the internal pressure in the transport pipe 114 is reduced, the pressure detecting means 112 detects the reduced pressure and outputs a reduced pressure detection signal to the first control device 110 via the signal line 111A. When the first control device 110 receives this decompression detection signal, the first control device 110 opens the opening / closing devices 105 and 105 of the granular material storage tanks 101 and 101 by the actuating device 109 and puts the powder into the transport pipe 114. The granular material in the granular material storage tanks 101 and 101 is discharged, and the discharged granular material is sucked and transported to the collector 131 through the transport pipe 114 and stored separately from the gas. Become.

  8 and 9 are longitudinal sectional views showing the detailed configuration of the pressure detecting means 112 described above. FIG. 8 shows the pressure detection means in the non-transport state from the granular material storage tank 101 to the collector 131, and FIG. 9 shows the pressure detection in the transport state from the granular material storage tank 101 to the collector 131. Means are shown. The pressure detection means 112 is provided at the rising portion 114A on the start end side of the upstream transport pipe 114 with respect to the transport direction of the granular material further than the part where the granular material storage tank 101 is connected to the transport pipe 114. ing.

  The pressure detecting means 112 is provided so as to close the opening 114B of the rising portion 114A on the start end side of the transport pipe 114, and includes a closing plate receiving part 120 in which an outside air introduction port 120A is formed at a substantially central portion, and the transport pipe 114. A closing plate guide tube 124 fitted inward from the rising portion 114A, a rod 123 slidably fitted in the inner tube 124A of the closing plate guide tube 124, and an upper end of the rod 123 A disc-shaped closing plate 121 that is fixed and disposed between the closing plate guide cylinder 124 and the closing plate receiving portion 120 and whose outer diameter is smaller than the inner diameter of the transport pipe 114 and larger than the outside air inlet 120A; It is interposed between the closing plate guide cylinder 124 and the closing plate 121 that urges the outside air introduction port 120 </ b> A in the direction of closing the outside air introduction port 120 </ b> A on the surface of the closing plate 121 in a normal state (non-transport state). And a spring 152. such as a coil spring. The spring receiver of the spring 152 has the function of arms 124C provided radially between the inner cylinder 124A and the outer cylinder 124B of the closing plate guide cylinder 124.

  Further, a limit switch 128 is fixed to the flange portion 120B of the closing plate receiving portion 120 that forms the outside air introduction port 120A via a mounting bracket 129. In addition, the detection rod 128A responsible for the ON / OFF operation of the limit switch 128 abuts against the flat surface of the closing plate 121 through the outside air introduction port 120A in a normal state, and the detection rod 128A is applied by the biasing force of the spring 152. Is pressed into the limit switch 128 to hold the OFF state.

  And in the said conventional pressure detection means 112, in the non-transport state from the granular material storage tank 101 to the collector 131, the internal pressure of the transport pipe 114 is in a state equivalent to the external air pressure, and is shown in FIG. As described above, the external air introduction port 120 </ b> A is kept closed by the closing plate 121 by the biasing force of the spring 152.

  Next, when the granular material in the collector 131 is consumed and reaches a predetermined amount, the detector 151 outputs an empty detection signal to the second control device 143 via the signal line 111B, and the detection. The second control device 143 that has received the signal outputs an operation signal to the actuator 142 via the signal line 111B to operate the actuator 142 and opens the electromagnetic valve 147 a preset number of times. When the operation device 142 is operated, the suction device 139 reduces the internal pressure in the collector 131 and the transport pipe 114.

  When the pressure in the transport pipe 114 is reduced, the closing plate 121 is lowered in the transport pipe 114 against the biasing force of the spring 152 of the pressure detecting means 112, and the outside air inlet 120A is opened (see FIG. 9). ). At this time, when the detection rod 128A follows the lowering of the closing plate 121, the limit switch 128 is turned on. When the limit switch 128 is turned on in this way, a pressure reduction detection signal is output from the limit switch 128 to the first control device 110 through the signal line 111A, and when the first control device 110 receives the pressure reduction detection signal, An opening operation instruction signal is transmitted to the opening / closing device 105 of the granular material storage tank 101, and the opening / closing device 105 is changed from the closed state to the open state for a predetermined time, so that the granular material in the granular material storage tank 101 is removed. Release into the transport tube 114. That is, the limit switch 128 functions as a switch that detects the vertical movement of the closing plate 121 of the pressure detecting means 112.

  However, in the conventional pressure detecting means 112, when the operating device 142 is operated, the suction device 139 reduces the internal pressure in the collector 131 and the transport pipe 114 to enter the transport state, so that the internal pressure of the transport pipe 114 is reached. 9 overcomes the biasing force of the spring 152, and as shown in FIG. 9, the closing plate 121 is separated from the outside air introduction port 120A, and the outside air and the inside of the transport pipe 114 are separated via the outside air introduction port 120A. As a result, the outside air as secondary air is added to the gas flow in the transport pipe 121 from the outside air inlet 120A, and the reaction of the blocking plate 121 to the pressure fluctuation becomes gentle. There was a problem that the body could not be transported smoothly, that is, stable transportation was hindered.

   Further, it has been found that due to the structure of the limit switch 128 that opens and closes the contact, there is a large difference between the force at the time of opening and closing the contact and the force before and after and the variation. If it continues to be used in this state, when it is used more than 50,000 times, the opening / closing operation may not be possible in the state of initial setting.

  In the case of sucking and transporting the granular material in this way, in order to prevent clogging of the transport pipe and to stably transport it, mixing of air for transportation to the granular material from the part of the granular material storage tank 101 where the material is charged, etc. Supply secondary air for ratio adjustment. In such a state that the gas flow and the granular material to which the secondary air is added are mixed, the granular material is transported in the transport pipe 114. In order to smoothly transport the granular material, It is an important factor to keep the mixing ratio between the air and the carrier air at a predetermined value. This mixing ratio is represented by a value obtained by dividing the weight of the granular material transported per unit time by the weight of the air subjected to transport per unit time. If this value is large, the resistance for transporting the inside of the transport pipe 114 becomes large, and there is a possibility that the transport pipe 114 is clogged due to a slow transport flow rate.

  When the conventional pressure detecting means 112 is employed in the granular material transport device, when the inside of the transport pipe 114 is depressurized, as described above, the closing plate 121 is separated from the outside air inlet 120A, and the outside air inlet 120A. As a result, the outside air communicates with the inside of the transport pipe 114 through the outside air, so that the outside air as the secondary air flows into the transport pipe 121 from the outside air introduction port 120A, and the inflow amount of the secondary air is reduced by the blocking plate. Because of the problem that 121 may change depending on the distance from the outside air introduction port 120A, it is difficult to adjust the secondary air amount, which is an important factor for the smooth transportation described above. There is a problem that the particles cannot be sucked and transported.

JP 2000-153922 A

  The present invention is intended to solve the above-described problems, and prevents inflow of outside air (secondary air) during transportation, detects pressure fluctuation quickly, and further performs secondary transportation during suction transportation described above. It is an object of the present invention to provide a gas pressure detection device that does not hinder the adjustment of air, and a granular material transport device that can perform stable transportation by using this gas pressure detection device.

  In order to achieve the above object, a gas pressure detecting device according to claim 1 of the present invention includes a closed body main body that is movably inserted into a cylinder communicating with a passage in which a gas flow is generated, and an upper portion of the closed body main body. A closed body comprising an annular flange that closes the outside air port of the cylinder in a transportation state in which the pressure due to the gas flow is changed for transportation; A fixed shaft for allowing movement according to pressure fluctuations caused by the gas flow, and an elastic body such as a spring such as a coil spring biased to open the outside air port of the cylindrical body in a normal state to the fixed shaft or the closed body And the annular flange of the closing body closes the outside air port of the cylinder against the urging force of the elastic body in the transport state, and attaches the elastic body in the non-transport state where there is no pressure fluctuation due to gas flow. The outside air vent of the cylinder should be opened by force It is characterized in.

  Thereby, in the non-transporting state where there is no pressure fluctuation, the annular flange portion of the closing body is moved up by the urging force of the elastic body, so that the outside air port extending through the cylindrical body is opened. In the transport state in which pressure fluctuation occurs due to the generation of the gas flow, the annular flange of the closing body blocks the outside air port of the cylindrical body against the urging force of the elastic body, so that outside air (secondary air) flows into the outside air port. As a result of preventing the inflow, the pressure fluctuation of only the transport gas flow can be detected accurately and quickly, and a stable gas flow can be secured. Moreover, the secondary air amount in the suction transportation can be adjusted accurately and easily, and the pneumatic transportation of the granular material can be performed stably and smoothly.

Here, “in the non-transport state” means a state where the transport route, for example, the inside of the transport pipe is decompressed and is not in a transportable state, and “in the transport state” means, for example, the inside of the transport pipe is decompressed, etc. It means a state where a granular material as a raw material for molding such as a synthetic resin is transported. In addition, there are two modes of pneumatic transportation: a case where the inside of the transport pipe is decompressed and transported by suction, and a case where the transport is pressurized and transported under pressure.
Further, in this specification, the “cylindrical body” refers to a case where the cylindrical body is a part of the transport pipe, or a case where a separate cylindrical body is configured to communicate with the inside of the transport pipe. It means to include two aspects. Specifically, as in the first example of the embodiment described later, the starting end of the transport pipe is bent in a bent shape, and the bent rising portion corresponds to the cylindrical body, or in the second example of the embodiment. As shown, it is meant to include two modes in the case of fixing a cylindrical body communicating with the inside of the transport pipe separately by welding or the like in the middle of the transport pipeline. Further, the “annular collar” is not limited to the one formed integrally with the upper end of the closing body main part 62A as shown in FIGS. 2, 3, 5, and 6, but the upper end of the closing body main part 62A. The upper part of the lower position may be used, and the formation position can be appropriately changed. Moreover, the annular flange portion and the closed body main body portion are not limited to being integrally formed as shown in the figure, but may be configured separately by a fitting method or a screwing method. The “elastic body” may be, for example, a spring such as a coil spring. When this spring is employed, a spring receiver may be provided on the fixed shaft, and a spring may be disposed between the spring receiver and the closing body. .

  The gas pressure detection device according to claim 2 is configured such that the closing body is made of a non-magnetic body, a magnet is provided in a part of the closing body, and a magnetic detection switch for detecting the magnet is provided in a fixed shaft. The magnetic detection switch is configured to detect the movement of the closing body along the fixed axis.

  As a result, the conventional limit switch of the pressure detecting means 112 has a large change in force before and after contact with the contact (that is, resistance due to the contact), and has the above-mentioned problem. Since the magnetic detection switch can detect without physical contact resistance, pressure fluctuations can be detected more sensitively, and the force to operate the obstructing body becomes uniform, and pressure fluctuations in the transportation path can be detected. It became possible to detect stably.

  As the magnetic detection switch, it is preferable to employ a known reed switch. In addition, the non-magnetic material can be made of a plastic material, and this plastic material is made of a heat-resistant material in consideration that it is used in an environment where the use environment is higher than the outside temperature. It is preferable to adopt. When the closing body is formed of such a heat-resistant plastic material, the expansion itself is also reduced, so that the possibility that the closing body expands and is caught by the inner diameter of the cylinder during movement can be reduced.

  According to a third aspect of the present invention, there is provided the gas pressure detecting device according to the third aspect of the present invention, wherein the closed body body portion of the closed body has an outer diameter smaller than the inner diameter of the cylinder body, The first clearance is formed between the outer diameter and the outer diameter of the annular flange portion is set to be larger than the inner diameter of the cylindrical body, and further at the center position of the closure body main body portion and the annular flange portion. The sliding hole is penetrated, and the inner diameter of the sliding hole is set to a size having a second clearance between the outer diameter of the fixed shaft, and the closing body is slidably inserted into the fixed shaft. The first clearance is larger than the second clearance.

  As a result, a first clearance formed by the outer diameter of the closing body main body and the inner diameter of the cylindrical body is formed between the inner diameter of the sliding hole of the closing body and the outer diameter of the fixed shaft. Therefore, when the closing body closes or releases the opening of the cylinder, the closing body body of the closing body repeatedly moves along the fixed axis in the cylinder. The obturator body can move up and down along the fixed axis without touching or catching the peripheral wall of the cylinder.

  A fourth aspect of the present invention is a granular material transporting device, wherein the gas pressure detecting device according to any one of the first to third aspects is provided at an appropriate position of a transport pipe constituting an aerodynamic transport path. is there.

  The invention of claim 5 is a more specific configuration of the granular material transport device of claim 4, and this granular material transport device separates the granular material storage tank, the granular material and the gas. In the granular material transport device that connects the collector with the transport pipe, and pneumatically transports the granular material of the granular material storage tank to the collector by the gas flow generated in the transport pipe by the gas flow generation source, The gas pressure detection device according to any one of claims 1 to 3 is provided in a transport pipe in the vicinity of the granular material storage tank.

  According to the invention of claim 4 or claim 5, the gas pressure detection device of any one of claims 1 to 3 can accurately detect a pressure change near the powder tank, It is suitable for controlling the opening / closing device for discharging the granular material from the granular material storage tank to the transport pipe using the detection signal detected by the gas pressure detection device. Furthermore, the effect of the gas pressure detection apparatus itself of Claims 1-3 can be enjoyed. In addition, the gas flow generation source refers to a suction device 39 such as a blower in an embodiment to be described later in a narrow sense, and may include an operation device 42 such as a motor for operating the suction device 39 in a broad sense.

  According to the gas pressure detecting device of the first aspect, in the non-transport state where there is no pressure fluctuation due to the gas flow, the annular flange of the closing body is moved up by the urging force of the elastic body, so that the outside air port of the cylinder is opened Is done. In the transport state in which pressure fluctuation occurs due to the generation of gas flow, the annular flange of the closing body closes the outside air port of the cylinder against the urging force of the elastic body, so that the outside air (secondary air) enters the outside air port of the cylinder. ) Can be prevented. As a result, the pressure fluctuation of only the transport gas flow can be detected accurately and quickly, and a stable gas flow can be secured. Moreover, the secondary air amount in the suction transportation can be adjusted accurately and easily, and the pneumatic transportation of the granular material can be performed stably and smoothly.

  According to the gas pressure detection device of claim 2, since the magnetic detection switch can detect without physical contact contact resistance as described above, pressure change can be detected more sensitively and obstruction can be detected. The force for moving the body becomes uniform, and the pressure fluctuation in the transportation path can be detected stably.

  According to the gas pressure detection device of claim 3, the first clearance formed by the outer diameter of the closing body main body and the inner diameter of the cylinder has the inner diameter of the sliding hole of the closing body and the outer diameter of the fixed shaft. Therefore, when the closing body closes or releases the outside air port of the cylinder, the closing body main body portion moves along the fixed axis. Although the movement is repeated in the body, the closed body main body can move up and down along the fixed axis without contacting or catching on the peripheral wall of the cylinder.

  According to the granular material transport device of claim 4 or claim 5, not only the effect of the gas pressure detection device of any one of claims 1 to 3 is exhibited, but also the pneumatic transport of the granular material is stabilized. Therefore, it is possible to provide a granular material transport apparatus that can be performed smoothly.

A first example of an embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a schematic configuration diagram of a granular material transport device using a gas pressure detection device according to a first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a main part of the gas pressure detection device according to the first embodiment when not transported. FIG. 3 is a longitudinal sectional view of an essential part of the gas pressure detection device in the transport state in the first embodiment.

  In FIG. 1, the granular material transport device is configured in the same manner as that in FIG. 7 except for the gas pressure detection device 60 (corresponding to the pressure detection means 112 in FIG. 7). That is, two powder storage tanks 1 and 1 in which powder is stored as a synthetic resin molding material, and a lower part of the powder storage tank 1 and 1 via opening and closing devices 5 and 5 such as a rotary feeder. By connecting the transport pipe 14, the collector 31 connected to the terminal end of the transport pipe 14 to separate the gas and the granular material, and making the internal pressure of the transport pipe negative through the collector 31. A suction device 39 for generating a gas flow of air in the transport pipe 14 and transporting the powder stored in the powder storage tanks 1 and 1 to the collector 31 side via the transport pipe 14 by a gas flow; The main structure.

  And the opening / closing device 5 connected to the lower part of the said granular material storage tank 1 respond | corresponds to the detection signal of the gas pressure detection apparatus 60 which detects the pressure fluctuation in the transport pipe line provided in the start end side of the transport pipe 14. The signal line 11A is connected to the first control device 10 that controls the opening and closing of the opening and closing device 5. The opening / closing device 5 includes an opening / closing valve 5A such as a rotary vane feeder provided between the powder storage tank 1 and a transport pipe 14 below, and an opening / closing power source such as a motor for opening / closing the opening / closing valve 5A. 5B. The open / close power source 5B is connected to a first control device 10 having a microcomputer sequencer or the like by a signal line 11A.

  Further, an operating device 42 such as a motor as a power source for operating the suction device 39 is connected to the suction device 39 as a gas flow generation source connected to the collector 31. It is connected to a second control device 43 having a microcomputer or the like via a line 11B.

The suction device 39 uses a blower, a compressor, or the like, and is connected to the upper portion of the collector 31 via the suction tube 32. Air is sucked into the transport tube 14 through the collector 31 and negative pressure is generated in the transport tube 14. A gas stream is generated in the state. The exhaust gas is open to the atmosphere from the exhaust port 40 of the suction device 39.
An air introduction port 36 is formed in the middle of the suction pipe 32, and an electromagnetic valve 37 is connected to the air introduction port 36. The electromagnetic valve 37 is connected to the second control device 43 via the signal line 11B, and the inside of the suction pipe 32 can be opened to the atmosphere by opening the electromagnetic valve 37.

  The collector 31 has a function of separating and collecting only the granular material from what is pneumatically transported in a state where the gas and the granular material are mixed through the transport pipe 14 in the granular powder storage tank 1. ing. In the upper part of the collector 31, a porous plate 33 that does not allow the passage of powder and allows the passage of gas is built in, so that the gas is discharged to the suction pipe 32 side. The body is fed from the inlet 34 to the outlet 35. Further, a transparent tube 49 is connected to the outlet of the collector 31, and an injection molding machine for forming a granular material, which is a synthetic resin molding material, at the lower end of the transparent tube 49 as shown by a dotted line in FIG. A molding machine 55 such as is connected.

  The transparent cylinder 49 is provided with a detector 51 such as a reflective photoelectric switch that detects the amount of powder in the collector 31. The detector 51 is connected to the second control device 43 via the signal line 11B. As a result, when there is no powder in the transparent tube 49, the detector 51 detects and sends the detection signal to the second control device 43.

  When the granular material in the collector 31 is consumed by the molding machine 55 and reaches a predetermined amount, the detector 51 outputs an empty detection signal to the second control device 43 via the signal line 11B. The second control device 43 that has received the detection signal outputs an operation signal to the operation device 42 via the signal line 11B to operate the operation device 42. When the operating device 42 is operated, the suction device 39 reduces the internal pressure of the collector 31 and the transport pipe 14.

  When the internal pressure in the transport pipe 14 is reduced as described above, the gas pressure detection device 60 detects this pressure reduction and outputs a pressure reduction detection signal to the first control device 10 via the signal line 11A. When the first control device 10 receives the decompression detection signal, the first control device 10 opens the opening and closing devices 5 and 5 of the granular material storage tanks 1 and 1 with the opening and closing power source 5B, and enters the transport pipe 14. The granular material in the granular material storage tanks 1 and 1 is discharged, and the discharged granular material is sucked and transported to the collector 31 through the transport pipe 14, and is separated from the transport gas and stored. It will be.

  As described above, the granular material transport device of the present invention separates the first control device 10 and the second control device 43 into the transport source and the transport destination of the granular material, respectively, as in the conventional example. And can be independently controlled, so that not only the installation work such as connecting the first and second control devices 10 and 43 with signal lines can be reduced, but also the control device There is an advantage that the control program for controlling the control can be simplified as compared with the case where the opening / closing device 5 and the operation device 42 of the granular material storage tank 1 are collectively controlled by a single control device. In addition, the present invention uses the gas pressure detection device according to any one of claims 1 to 3, and thus has the advantages as described above.

  2 and 3 are longitudinal sectional views showing a detailed configuration of the gas pressure detection device 60 described above. A part of the gas pressure detection device 60 is movably inserted into a cylindrical body 61 that is a rising portion 14 </ b> A in which a start end side of a transport pipe 14 constituting an aerodynamic transport path is bent upward in a bent shape. That is, the gas pressure detection device 60 is provided on a closed body main body 62A that is movably inserted into a cylinder 61 communicating with a passage in which a gas flow is generated, and an upper portion of the closed body main body 62A. In the transportation state in which the pressure due to the transportation is changed for transportation, a closed body 62 comprising an annular flange 62B that closes the outside air port 61A of the cylindrical body 61, and facing the cylindrical body 61, and the closed body 62 Is fixed to the fixed shaft 64 so as to be movable in accordance with the pressure fluctuation caused by the gas flow, and the elastic body 65 urged to open the outside air port 61A of the cylindrical body 61 in the normal state to the fixed shaft 64 or the closed body 62. And a magnet 63B provided in a part of the closing body 62 and a magnetic detection switch 63A provided in the fixed shaft 64 for detecting the magnet 63B.

  The closing body 62 is made of a non-magnetic material, and is provided with a cylindrical closing body main body 62A and an annular flange portion that is provided above the closing body main body 62A and has a diameter larger than the inner diameter of the cylindrical body 61. 62B, and moves up and down according to the pressure fluctuation in the transport pipe 14 due to the generation and stop of the gas flow. When the closing body 62 moves down, the annular flange 62B closes the outside air port 61A, which is the open end of the cylindrical body 61, as shown in FIG.

  The fixed shaft 64 is fixed to the other end of the bracket 66 whose one end is fixed to the transport pipe 14 by a fastener 67 such as a nut. The closing body 62 is configured to be movable relative to the outside air port 61A along the fixed shaft 64, and an elastic body 65 such as a coil spring is provided on the fixed shaft 64, and the closing body 62 normally opens the outside air port 61A. It is energized not to block. In FIGS. 2 and 3, reference numeral 68 denotes an elastic stopper.

  The closed body 62A of the closed body 62 has an outer diameter r1 that is smaller than the inner diameter R of the cylinder 61, and the outer diameter R1 of the cylinder 61 and the outside of the closed body main part 62A when inserted into the cylinder 61. A first clearance M is provided between the diameter r1.

  Moreover, the outer diameter r2 of the annular flange 62B is set to be larger than the inner diameter R of the cylindrical body 61, and penetrates the sliding hole 62C at the center position of the closing body main body 62A and the annular flange 62B. A second clearance m is formed between the inner diameter r3 of the hole 62C and the outer diameter L of the fixed shaft 64, and the closing body 62 is slidably inserted into the fixed shaft 64. The first clearance M is set to be larger than the second clearance m, so that the closed body 62 is closed when the closed body 62 closes or releases the closed air port 61A of the cylindrical body 61. There is a possibility that a part of the closed body main part 62A repeatedly moves in the cylinder 61 along the fixed shaft 64, and the outer diameter r1 of the closed body main part 62A contacts the inner diameter R of the cylindrical body 61 to hinder the movement. Can be prevented. That is, when the closing body main part 62A moves along the fixed shaft 64, the play (backlash) is affected by the second clearance m, so that the play has a first clearance larger than the second clearance m. It absorbs with M. Therefore, a first clearance M is formed between the inner diameter R of the cylindrical body 61 and the outer diameter r1 of the closing body main body 62A.

  The magnetic detection switch 63A embedded in the fixed shaft 64 and the magnet 63B provided at a predetermined position of the sliding hole 62C of the closing body 62 constitute a sensor 63. The magnetic detection switch 63A fixes the closing body 62. Following the movement along the axis 64, the movement of the magnet 63B is detected. As this magnetic detection switch 63A, a known reed switch can be employed.

In the gas pressure detecting device according to the present invention, the annular flange 62B of the closing body 62 closes the outside air port 61A of the cylindrical body 61 against the urging force of the elastic body 65 in the transporting state, and pressure fluctuation due to the gas flow occurs. In a non-transporting state, the outside air port 61A of the cylindrical body 61 is opened by the urging force of the elastic body 65.
Next, the operation of the above embodiment will be briefly described.

As shown in FIG. 2, in a non-transporting state where there is no pressure fluctuation, the elastic body 65 is biased by a biasing force between the outside air port 61A of the cylindrical body 61 formed integrally with the transport pipe 14 and the annular flange 62B. The stroke S is formed, and the outside air can flow from the gap of the stroke S.
In this case, the magnet 63 </ b> B provided at the lower part of the closing body 62 is close to the magnetic detection switch 63 </ b> A built in the fixed shaft 64 and the sensor 63 is turned on.

  When the suction device 39 depressurizes the collector 31 and the transport pipe 14 by operating the operation device 42 such as a motor, as shown in FIG. The portion 62A descends against the urging force of the elastic body 65 in the cylindrical body 61, and the annular flange 62B closes the outside air port 61A, so that the stroke S becomes zero and the inflow of outside air from the outside air port 61A. Will be in a transported state where is blocked. In this case, the magnet 63B is separated from the magnetism detection switch 63A, does not detect magnetism, and the sensor 63 is turned off. The size of the stroke S can be set as appropriate, but is set to such a size that the closing body 62 can be moved downward by the change in internal pressure until the transportation state is reached and the outside air port 61A can be closed. For example, the larger the pressure change for transportation, the larger the stroke S can be set.

  In addition, in the 1st example of the said Example, although the case where it applied to the granular material transport apparatus which pneumatically conveys a granular material from the two granular material storage tanks 1 and 1 was demonstrated, one group or three or more sets Of course, the present invention can also be applied to a granular material transport apparatus provided with the granular material storage tank 1.

  A second example of the embodiment of the present invention will be described with reference to FIGS.

In the first example described above, the transport pipe 14 is further extended to the upstream side of the transport path of the granular material storage tanks 1, 1, and the rising end portion 14 </ b> A is bent upward at the starting end side of the extended transport pipe 14. The cylindrical body 61 into which the gas pressure detection device 60 is inserted is used. However, in the gas pressure detection device 60 of the second example, the transport pipe 14 between the powder storage tanks 1 and 1 communicates with the inside of the transport pipe. In addition, a cylindrical body 61 of the gas pressure detection device 60 is provided. Since the configuration other than the attachment position is the same as that of the first example of the above-described embodiment, repeated description will be omitted.
The mounting position of the gas pressure detection device 60 is not limited to the position of the first example and the second example, but is provided at a part of the transport pipe 60 on the further upstream side or the downstream side of the granular material storage tanks 1 and 1. May be.
Moreover, although the said each Example has illustrated the case where a gas pressure detection apparatus is applied to the granular material transport from the granular material storage tank 1, not only this but the said granular material storage tank 1 is heated. It can also be applied to the transportation of powder from a dryer provided with a heater. In this case, the closing body 62 is preferably made of a heat resistant material. Thereby, the pressure change can be accurately detected even for the pneumatic transportation device for the granular material in a high temperature state, and the durability is improved.

  The gas pressure detection device according to the present invention and the granular material transport device using the gas pressure detection device can prevent the inflow of outside air after detecting the pressure change in the transport pipe. Not limited to this, it can also be used in an aerodynamic transport device that uses other powder and granular materials as transport objects.

It is a schematic block diagram of the granular material transport apparatus using the gas pressure detection apparatus in Example 1 of this invention. It is a principal part longitudinal cross-sectional view at the time of the non-transport state of the gas pressure detection apparatus in Example 1 of this invention. It is a principal part longitudinal cross-sectional view at the time of the transport state of the gas pressure detection apparatus in Example 1 of this invention. It is a schematic block diagram of the granular material transport apparatus using the gas pressure detection apparatus in Example 2 of this invention. It is a longitudinal cross-sectional view at the time of the non-transport state of the gas pressure detection apparatus in Example 2 of this invention. It is a principal part longitudinal cross-sectional view at the time of the transport state of the gas pressure detection apparatus in Example 2 of this invention. It is a schematic block diagram of the granular material transport apparatus to which the conventional gas pressure detection means is applied. It is a principal part longitudinal cross-sectional view at the time of the non-transport state of the conventional gas pressure detection means. It is a principal part longitudinal cross-sectional view at the time of the transport state of the conventional gas pressure detection means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder storage tank 5 Switchgear 10 First controller 14 Transport pipe 31 Collector 39 Suction device 42 Actuator 43 Second controller 60 Gas pressure detector 61 Cylindrical body 61A Outside air port 62 Closed body 62A Closed body main body Part 62B annular flange 63 sensor 63A magnetism detection switch 63B magnet 64 fixed shaft 65 elastic body M first clearance m second clearance

Claims (5)

A closed body main body portion that is movably fitted in a cylinder communicating with a passage in which a gas flow is generated, and an upper portion of the closed body main body portion, and in a transportation state in which the pressure due to the gas flow is changed for transportation. A closing body composed of an annular flange that closes the outside air port of the cylindrical body,
A fixed shaft that faces the cylinder and allows the closure body to move according to pressure fluctuations caused by gas flow;
An elastic body biased to open the outside air port of the cylindrical body in a normal state on the fixed shaft or the closed body;
The annular flange of the closing body closes the outside air port of the cylinder against the urging force of the elastic body in the transport state, and the cylinder by the urging force of the elastic body in the non-transport state where there is no pressure fluctuation due to gas flow. A gas pressure detecting device characterized in that an open air opening of a body is opened.   The closure body is made of a non-magnetic body, and a magnet is provided in a part of the closure body, and a magnetic detection switch for detecting the magnet is provided in a fixed shaft. The gas pressure detecting device according to claim 1, wherein the gas pressure detecting device is configured to detect movement along.   The closing body body portion of the closing body has a first clearance between the inside diameter of the cylinder body and the outside diameter of the closing body body portion when the outside diameter is smaller than the inside diameter of the cylinder body and is inserted into the cylinder body. The outer diameter of the annular flange is set to be larger than the inner diameter of the cylindrical body, and further passes through a sliding hole at the center position of the closing body main body and the annular flange, and this sliding The inner diameter of the hole is set to a size having a second clearance between the outer diameter of the fixed shaft, a closing body is slidably inserted into the fixed shaft, and the first clearance is The gas pressure detection device according to claim 2, wherein the gas pressure detection device is larger than the second clearance.   A granular material transport device comprising the gas pressure detection device according to any one of claims 1 to 3 at an appropriate position of a transport pipe constituting an aerodynamic transport path.   The powder storage tank and a collector for separating the powder and gas are connected by a transport pipe, and the powder in the powder storage tank is removed by a gas flow generated in the transport pipe by a gas flow source. In the granular material transport apparatus that pneumatically transports to the collector, the gas pressure detection device according to any one of claims 1 to 3 is provided in a transport pipe in the vicinity of the granular material storage tank. A granular material transport device.

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