JP2005035793A - Device and method for supplying powdery and granular material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for supplying a powdery and granular material for securing stability in quantitative feed of the powdery and granular material and precisely performing variable control of a feeding amount by improving fluidity of the powdery and granular material. <P>SOLUTION: In the powdery and granular material supplying device, a casing 5 is continuously provided beneath a storage tank 1, an inside of the casing and the inside of the storage tank 1 are communicated through a powdery and granular material delivery pipe 4 vertically provided on a bottom part of the storage tank 1, the powdery and granular material stored in the storage tank 1 is fed outside under pressure with compressed gas by means of a powdery and granular material feeding cylinder 16 on the bottom part of the casing 5. A vibration imparting unit 15 provided with a relay member receiving the powdery and granular material flowing down from the powdery and granular material delivery pipe 4 of the storage tank 1 and feeding it to the powdery and granular material feeding cylinder 16 and a vibration-generating source 14 for vibrating the relay member is arranged in a compressed gas chamber 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is, for example, a spray gun that sprays a powder paint (fine powder) onto a painted surface, a spray material (fine powder) that is sprayed onto a hard and brittle material, smoothing the spray surface, gradation (Pattern) Powder and particle supply device used in an air blasting device for performing processing, grooving, etc., and supplying powder quantitatively by mixing it with compressed gas, and powder supply method using the device It is about.

  In the granular material supply apparatus according to the present invention, when the quantitative supply of the granular material and the variable control of the supply amount are required, the fluidity of the granular material needs to be kept constant. Factors that affect the particle size include not only the adhesion of the particles but also the environmental conditions such as the shape of the particles and the surrounding humidity, especially when the particle size of the particles handled is a fine powder of 50 μm or less. The influence of the factors affecting the fluidity on the fine powder is large, and it is predicted that the fluidity will change.

  When the granular material handled as described above is a fine powder, the fine powder adheres to the inner wall of the hopper, a shelf hanging phenomenon in which the fine powder forms a bridge, or a clogging phenomenon in the supply pipe below the hopper occurs. There is a problem that the supply amount becomes unstable easily, and as a method for preventing these problems, a vibration (or impact) generation source is attached to the hopper side wall to vibrate (or shock) the hopper side wall, or a hopper 2. Description of the Related Art Generally, a powder supply apparatus provided with a method for mechanically stirring powder inside is known.

As an example, Patent Document 1 discloses that a supply thin tube (inner diameter: 0.5-2.Omm) is continuously provided at the lower part of a hopper in which fine powder (particle size: 50 μm or less) is stored. The hopper is vibrated by vibration means (frequency: 10-200 Hz) composed of a mechanical motor, vibration motor, electromagnetic vibrator, etc., and the amount of fine powder supplied can be variably controlled by changing the frequency. A supply method and apparatus are disclosed.
JP-A-8-33839 (FIG. 1)

  The invention of Patent Document 1 comprises a hopper storing fine powder as shown in FIG. 1 of the publication, a supply thin tube connected to the lower portion of the hopper, and a vibration means attached to the supply thin tube. The vibration means is configured to vibrate the supply tubule and / or the hopper and supply fine powder in the hopper through the supply tubule as described in claims 4 and 5, and to change the vibration frequency. This makes it possible to change the supply amount.

  However, the fine powder having a particle size of 50 μm or less is greatly influenced by the factors affecting the fluidity given to the fine powder as described above, and the quantitative supply and supply of the fine powder in which the fluidity can be changed. The supply method of the present invention using only vibration means such as a vibration motor as a supply device for variable control of the amount may not solve the above-mentioned adhesion of fine powder, and the pressure of the powder system path in the supply device Therefore, there is a problem in stability of quantitative supply and variable controllability of supply amount.

  The present invention solves the above-mentioned problems of the prior art, and provides a powder supply device and a powder supply method for accurately adjusting the stability of quantitative supply without changing the fluidity of fine powder and the variable control of the supply amount. It is to provide.

  The present invention, which has been made to solve the above-mentioned problems, has a casing continuously provided below a storage tank having a hopper shape at the bottom, and the compressed gas chamber and the storage tank in the casing are suspended from the bottom of the storage tank. A granular material that is communicated with the provided granular material delivery pipe and has a granular material supply tube for supplying the granular material to the outside by the compressed gas supplied to the compressed gas chamber. In the supply device, the compressed gas chamber has a vibration generating source supporting a relay member for feeding the granular material sent from the granular material delivery pipe to the granular material feeding tube, and the relay member The granular material supply apparatus according to claim 1 is characterized in that the granular material supply device is arranged separately from the granular material supply cylinder. In the above-described invention, the relay member is formed of a relay pipe, and the relay pipe is detachably attached to the powder material delivery pipe. The relay member is the relay tank and the relay tank. The invention according to claim 3 is characterized in that it comprises a relay pipe connected to the lower part, and the relay tank is separated from the powder material delivery pipe and supported by a vibration generating source.

  Moreover, in the above-described invention, a compressed gas supply port for supplying compressed gas to the compressed gas chamber is provided on the side wall of the casing, and a vent pipe extending from the compressed gas chamber to the inside of the storage tank is provided, and the storage tank and the relay member And the granular material supply cylinder, the pressure of the compressed gas chamber is the same as the invention of claim 4, the relay tank, the inner diameter of the upper end opening is larger than the granular material delivery pipe of the storage tank, In addition, a relay pipe is detachably provided at the bottom, and the granular material delivery pipe is inserted into the upper end opening of the relay tank with a sufficient gap therebetween to contact the granular material delivery pipe. The invention of claim 5 wherein the relay pipe is inserted with a sufficient gap so that the tip of the relay pipe does not come into contact with the granular material feeding cylinder provided at the bottom of the casing. And Further, the shape of the relay pipe in claim 5 is an L shape in which the horizontal pipe part is connected to the vertical pipe part suspended from the bottom part of the relay tank, and the tip of the horizontal pipe part is provided at the bottom part of the casing. According to the invention of claim 6, the powder tube is inserted from the side into the upper end of the granular material feeding cylinder, and the shape of the relay pipe in claim 2 is the horizontal tube portion attached to the vertical tube portion attached to the granular material delivery tube. In the invention of claim 7, an L-shaped one in which the tip of the horizontal tube is obliquely upward is inserted from the side into the upper end opening of the granular material feeding cylinder. Furthermore, in the invention according to any one of claims 1 to 8, the vibration generating source according to any one of claims 1 to 7 is a piezoelectric element, and the invention according to claim 8 is used. The spray nozzle is connected to the tip of the granular material feed pipe that is connected to the feed cylinder, the spray material is stored in a storage tank, and used for an air blast device that sprays the spray material from the spray nozzle. The granular material supply device to be used is the invention of claim 9.

  Moreover, by supplying the compressed gas to the compressed gas chamber by using the powder and particle supply device according to any one of claims 1 to 9, the compressed gas chamber, the storage tank, and the vibration supply unit are relayed. The powder supply method according to claim 10, wherein the pressure of the flow path system of the powder reaching the tank and the powder supply cylinder is the same as the pressure of the compressed gas chamber. Using the granular material supply apparatus according to any one of claims 1 to 9, compressed gas is supplied to a compressed gas chamber, and the flow path system of the granular material is set to the same pressure, whereby the granular material A method for supplying powder particles, wherein the powder is quantitatively supplied or the supply amount is variably controlled by changing the combination of the frequency and amplitude of the relay member. The invention of item 11. Furthermore, using the granular material supply apparatus according to any one of claims 1 to 9, the frequency of the vibration source is selected and set within a range of 100 to 600 Hz and the amplitude is 70 μm or less. The method for supplying granular material according to claim 12 is characterized in that the internal diameter of the relay pipe is 0.2 to 0.2 mm using the granular material supply device according to any one of claims 2 to 8. A powder supply method comprising: preparing a plurality of relay pipes in a range of 10.0 mm; and stepwise controlling a supply amount of the powder granules by exchanging relay pipes having different inner diameters. It is set as invention of this. In carrying out the invention according to claim 12 or 13, the supply amount of the granular material is controlled in a minute amount by changing the frequency of the vibration source in the range of 100 to 600 Hz and the amplitude within 70 μm. In carrying out the invention according to any one of claims 12 to 14, the storage tank is filled with a granular material having a particle size of 5 to 80 μm, and the granular material is 5 to 700 mg. The invention of supplying at a supply rate of / sec is the invention of claim 15.

  The granular material supply device of the present invention has a casing continuously provided below the granular material storage tank, and communicates the compressed gas chamber provided in the casing and the storage tank with the granular material delivery pipe, At the bottom of the casing, a powder feed tube for supplying the powder sent from the storage tank to the outside by compressed gas is projected, and the compressed gas chamber is provided with a powder feed pipe. A relay member for feeding the granular material to be fed into the granular material feeding cylinder is supported by a vibration source so as to be in non-contact with the granular material feeding cylinder, and compressed gas is introduced into the relay pipe of the relay member. Since the pressure of the storage tank and the compressed gas chamber in the casing is made the same, the granular material in the relay pipe and the granular material serving as the outlet thereof are fed. Since the pressure applied to the cylinder is the same, relay of the relay member Can vibration of effectively acts to transfer at a constant speed also improves the fluidity at poor flowability granular material. By assuming that the relay member is composed of an L-shaped relay pipe and the relay pipe is detachably attached to the powder body delivery pipe, the powder body can be smoothly transferred. Alternatively, the relay member is made up of a relay tank and a relay pipe attached to the lower part of the relay member, and the relay tank is completely separated from the granular material delivery pipe and supported by the vibration generating source. It can be made to oscillate away from a granular material delivery tube and a granular material supply pipe | tube, and a granular material can be conveyed smoothly.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 and FIG. 2, a storage unit 1 has a sealed structure in which an upper end is an opening 2 and a detachable lid 3 is provided in the opening 2, and a hopper-shaped bottom 1 a is formed in the lower part. A powder delivery pipe 4 is suspended from a hopper-shaped lower end of the bottom 1 a of the storage tank 1.

  Reference numeral 5 denotes a cylindrical casing provided with a compressed gas supply port 6 on the side wall and detachably connected to the lower end of the storage tank 1 by bolts. The bottom 1a and the lower part of the storage tank 1 positioned above the casing 5 A compressed gas chamber 7 is formed by a bolt-fixed bottom plate 51 that is detachably provided on the base plate 51. 8 is a passage provided so that the lower end opening faces the compressed gas chamber 7 and the upper end opening is positioned near the opening 2 of the storage tank 1 so that the pressure in the storage tank 1 is the same as that in the compressed gas chamber 7. 8a is an exhaust pipe in which an upper end opening is positioned in the vicinity of the opening 2 at the upper end of the storage tank 1 and an open / close valve 8b is attached to the lower end. The exhaust pipe 8a is connected to the open / close valve 8b before removing the lid 3. Is used for extracting compressed gas remaining in the storage tank 1.

  In the compressed gas chamber 7 of the casing 5, the relay pipe 13 is detachably attached to the upper end opening 12 and the lower end opening 18 into which the granular material delivery pipe 4 suspended from the lower end of the bottom 1 a of the storage tank 1 is inserted. The relay tank 11 to be attached and the vibration generation source 14 are integrated to form a vibration supply unit 15, and the vibration supply unit 15 is bolted to a bracket 14 a provided on the bottom plate 51 of the casing 5 via the vibration generation source 14. Has been. In addition, the inner diameter of the upper end opening 12 of the relay tank 11 is larger than the outer diameter of the powder delivery pipe 4 of the storage tank 1, and a gap is provided. The upper end opening 12 of the relay tank 11 is prevented from coming into contact with the granular material delivery pipe 4 of the storage tank 1 when oscillated. Further, the shape of the relay pipe 13 of the relay tank 11 is preferably L-shaped as shown in the figure, but if the fluidity of the granular material is particularly bad, it is necessary to have a straight shape (not shown).

  Reference numeral 16 denotes a granular material feeding cylinder formed on the bottom plate 51 of the casing 5. The upper end opening 17 faces the compressed gas chamber 7, and the tip of the relay pipe 13 of the relay tank 11 is inserted. Connected to the lower end of the body feeding cylinder 16 is a granular material feeding pipe 19 having an injection means 20 attached to the tip. When the shape of the relay pipe 13 of the relay tank 11 is L-shaped as shown in the drawing, the shape of the upper end opening 17 of the granular material feeding cylinder 16 is such that the tip of the relay pipe 13 of the relay tank 11 is powdered. Since it will be inserted from the side part of the granular material supply cylinder 1116, the upper end opening 17 of the granular material supply cylinder 16 which becomes the insertion location is cut out on the semi-periphery to form a semi-cylindrical shape. When the shape of the relay pipe 13 of the relay tank 11 is a straight shape (not shown), the upper end opening 17 of the granular material feeding cylinder 16 may be a horizontal opening shape. Further, the inner diameter of the upper end opening 17 of the granular material feeding cylinder 16 is larger than the outer diameter of the relay pipe 13 of the relay tank 11 and is provided with a gap. The relay tank 11 is vibrated by the operation of the vibration source 14. In this case, the tip of the relay pipe 13 of the relay tank 11 does not come into contact with the upper end opening 17 of the granular material feeding cylinder 16.

  The granular material supply apparatus of the present invention configured as described above, after putting the granular material into the storage tank 1 from the opening 2 at the upper end, attaches and fixes the lid 3 to the opening 2 of the storage tank 1. The storage tank 1 is sealed, then [A] the compressed gas is supplied from the compressed gas supply port 6 and [B] the vibration generating source 14 is energized to vibrate the relay tank 11 of the vibration supply unit 15.

  The compressed gas supplied from the compressed gas supply port 6 described in [A] is (1) the inside of the storage tank 1 through the vent pipe 8 and (2) the upper end opening of the relay tank 11 of the vibration supply unit 15. 12 is introduced into the relay tank 11 and (3) the powder feed cylinder 16 from the upper end opening 17 of the powder feed cylinder 16 provided on the bottom plate 51 of the casing 5. Since the granular material of the channel system of (3) is pressurized at a constant pressure, the granular material of the channel system can be transferred at a constant speed. In addition, when handling powders that dislike humidity, if the dehumidifier is attached to the device that supplies the compressed gas, the fluidity of the powders can be improved and transferred at a constant speed. Quantitative supply and variable control can be performed with high accuracy even for powders that dislike humidity.

  Further, the vibration (frequency and vibration strength) of the relay tank 11 described in [B] is determined by determining the supply amount of the granular material in the flow path system of (1) to (3). While aiming at variable supply and variable control of the supply amount, while maintaining the fluidity of the granular material constant by the action of the vibration of the relay tank 11 and the pressure applied to the granular material described in [A] above Spraying can be performed from the spraying means 20 via the powder and granular material supply pipe 19. In addition, since only the relay tank 11 having a small capacity isolated from the storage tank 1 is vibrated, the vibration generating source 14 employs a piezoelectric element that can change the strain (amplitude) by changing the voltage. Thus, the vibration supply unit 15 can be reduced in size, but the vibration generating source 14 is not limited to the piezoelectric element, and may be another electromagnetic vibrator or a vibration motor.

  Incidentally, the capacity of the storage tank 1 shown in FIG. 1 is 3 liters, whereas the capacity of the relay tank 11 is 0.02 liters.

  Next, an example of use when the granular material supply device of the present invention shown in FIG. 3 is incorporated in an air blast device will be described.

  Reference numeral 22 denotes a granular material supply device according to the present invention, and an electropneumatic system that controls the pressure of the compressed gas supplied from the compressed gas supply device 23 to the compressed gas supply port 6 of the casing 5 of the granular material supply device 22. A compressed gas supply pipe 26 a provided with a proportional valve 26 is connected, and provided at the tip of the powder supply pipe 19 of the powder supply apparatus 22 as an injection means 20 in the cabinet 37 of the air blast apparatus 21. The injection nozzle is connected. 31, 32, and 33 are an X axis, a Y axis, and a Z axis that three-dimensionally operate the spray nozzle by the slider driver 34, 35 is a workpiece (workpiece), and 36 is a workpiece 35 provided on the front surface of the cabinet 37. The open / close door 29 is a dust collector that collects dust in the cabinet 37 via the dust collection duct 28. Reference numeral 24 denotes (1) an electro-pneumatic proportional valve 26 that supplies compressed gas, (2) a vibration generation source that vibrates the vibration tank of the granular material supply device 22, and (3) three-dimensional injection means 20 (injection nozzle). (1) set pressure of compressed gas by the electro-pneumatic proportional valve 26 (2) vibration frequency and vibration intensity (amplitude) of the vibration source, and (3) slider driver 34. The control means has a built-in program for controlling the three-dimensional operation.

  Hereinafter, an air blasting device 21 as an example of use of the granular material supply device 22 of the present invention will be described.

  After the work 35 is placed and fixed in the cabinet 37 from the open / close door 36 of the air blasting device 21, the powder (injection material) is put into the storage tank 1 of the powder supply device 22 and subjected to blasting. Make preparations. Next, when the control hand throw 24 is activated, (1) the pressure of the compressed gas by the electro-pneumatic proportional valve 26 is set, and the compressed gas supply device 23 in the casing 5 of the granular material supply device 22 is supplied via the supply pipe 26a. Supplying compressed gas to the compressed gas chamber 7, and (2) setting the appropriate frequency and vibration strength (amplitude) of the vibration source and setting the supply amount (injection charge) of the granular material (injection material), and (3 ) The blasting is started in conjunction with the scanning setting of the ejection means 20 (injection nozzle) by setting the three-dimensional operation of the slider driver 34, and the above (1) to ( The blasting process is automatically terminated by the operation of 3). Various blasting processes can be performed by changing the conditions of the operation control programs (1) to (3) incorporated in the control means 24.

  Hereinafter, the Example which came to complete the granular material supply apparatus of this invention is described.

[I] A granular material having an average particle size of 1) 8 μm (# 1500), 2) 11.5 μm (# 1000), 3) 30 μm (# 400), and [II] The inner diameter is 1) 0.3 mm, 2) Omm, 3) 3. The Omm relay pipe 13 is prepared, and the three types of powders described in [I] are used in the nine cases using the three types of relay pipes 13 described in [II]. 0.5 MPa compressed gas is supplied to the compressed gas supply port 6 [IV] The voltage of the piezoelectric element used for the vibration generating source 14 is 200 V at which the vibration strength (amplitude) is maximum, and the frequency is between 150 to 600 Hz. As a result of measuring the supply amount (injection amount) of the granular material by changing the frequency at intervals of 50 Hz, the supply amount (injection amount) is [IV] the frequency of the vibration generating source 14 (piezoelectric element) in all the nine examples The maximum is shown at 300 Hz, the supply amount (injection amount) of the granular material tends to increase when the frequency of the piezoelectric element is 150 to 300 Hz, and the frequency of the granular material is between 300 and 600 Hz. The supply amount (injection amount) was on a downward trend. 1) FIG. 4 shows a state in which the average particle size of the granular material is 8 μm (# 1500) / the inner diameter of the relay pipe 13 is 2 mm, and 2) the average particle size of the granular material is 11.5 μm (# 1000). ) / The inner diameter of the relay pipe 13 is 1. The state of Omm is shown in FIG. 6, and 3) The average particle diameter of the granular material is 30 μm (# 400) / the inner diameter of the relay pipe 13 is 3. The state of Omm is shown in FIG. The amplitude when the voltage of the piezoelectric element used for the vibration source 14 was 200 V (maximum) was 70 μm.

  In addition, the piezoelectric material used for the vibration source 14 was compared with the nine examples using the three types of granular material described in [I] and the three types of granular material supply pipes 13 described in [II]. The frequency of the element was set to 300 Hz where the supply amount (injection amount) of the granular material was the maximum from the above attempt, and the supply amount of granular material (by changing the voltage between 0 to 200 V at 25 V intervals) As a result of confirming the inner diameter of the relay pipe 13 having the widest control range of the injection amount), 1) When the average particle diameter of the granular material is 8 μm (# 1500), the inner diameter of the relay pipe 13 is 0.3 mm as shown in FIG. 2) When the average particle size of the granular material is 11.5 μm (# 1000), the inner diameter of the relay pipe 13 is 1. Omm, 3) When the average particle size of the granular material is 30 μm (# 400), as shown in FIG. Omm.

  In addition, as a result of confirming the maximum fluctuation ratio of the supply amount (injection amount) of the granular material at the same voltage level when the change of the voltage (25V interval) of the piezoelectric element of the above attempt is increased and decreased, 1 The average particle size of the powder is 8 μm (# 1500) / within 20 mm when the inner diameter of the relay tube 13 is 0.3 mm. 2) The average particle size of the powder is 11.5 μm (# 1000) / relay The inner diameter of the tube 13 is 1. Omm, and 3) The average particle diameter of the granular material is 30 μm (# 400) / the inner diameter of the relay pipe 13 is 3. In Omm, it was within 10% of soil.

FIG. 10 shows a granular material supply apparatus having a form different from that described above.
Also in this granular material supply apparatus, a casing 5 is continuously provided below a storage tank 1 having a bottom portion 1a having a hopper shape, and the compressed gas chamber 7 and the storage tank 1 in the casing 5 are connected to the bottom portion 1a of the storage tank 1. It is communicated by a granular material delivery tube 4 made of a stretchable / flexible material suspended from the tube. A pressure-resistant member 61 that receives the weight of the powder and smoothes the powder is provided on the upper part of the powder and powder delivery pipe 4. The pressure-resistant member 61 is a pipe-shaped member whose upper end is closed and whose lower end is opened, and has a powder particle inlet 62 on its side surface.

  In addition, a powder particle supply cylinder 16 for supplying powder particles to the outside protrudes from the bottom 51 of the casing 5. The relay pipe 13 for feeding the powder sent from the powder feed pipe 4 to the powder feed cylinder 16 is supported by the vibration generating source 14 via the attachment member 63. As shown in the figure, the relay pipe 13 has an L shape in which a horizontal pipe portion 13b is connected to a vertical pipe portion 13a that is detachably attached to the granular material supply pipe 4. Since the vertical tube portion 13a is supported by the vibration generating source 14 that is obliquely attached to the granular material delivery tube 4 and inclined, the tip of the horizontal tube portion 13b is inclined upward, and the granular material is caused by its own weight. Is difficult to be pushed out from the tip of the horizontal tube portion 13b. And this horizontal tube part 13b front-end | tip is inserted from the side into the semi-cylindrical receiving port 17 formed in the upper end of the granular material supply cylinder 16, but the granular material supply cylinder 16 and the horizontal tube part It is separated from the tip of 13b with a sufficient margin so as not to come into contact with vibration.

  In the granular material supply apparatus configured as described above, the compressed gas chamber 7, the storage tank 1, and the relay pipe 13 have the same pressure by the compressed gas supplied from the compressed gas supply port 6. And when this compressed gas flows into the receiving port 17 of the granular material supply cylinder 16, a negative pressure is applied to the tip of the horizontal tube portion 13b, so that the granular material flows into the receiving port 17.

  As the relay pipe 13, a plurality of relay pipes 13 having an inner diameter φ of 0.2 to 10.0 mm are prepared, and the supply amount of the granular material is controlled stepwise by exchanging the relay pipes 13 having different inner diameters. be able to.

Hereinafter, the test result about the above-mentioned granular material supply apparatus is demonstrated according to an Example. The conditions in this test are as follows.
Powder: GC # 400, supply rate 10g / min, voltage: 130Vpp, frequency (frequency) 470Hz, measurement time, 15sec, number of measurements: 10 times, initial charge: 3 liters,
FIG. 11 shows the average value of the supply amount of 10 times over time. It can be seen that the powder is supplied very stably up to 8 hours when the powder is cut. FIG. 12 shows the influence of voltage (amplitude) on the supply amount, and FIG. 13 shows the influence of frequency (frequency) on the supply amount. The supply amount can be adjusted by changing the voltage or frequency. I understand.

  As is apparent from the above description, the granular material supply device of the present invention is configured such that the compressed gas is supplied to the compressed gas chamber 7 in the casing 5 to store the granular material in the storage tank 1. In the relay tank 11 that vibrates by the vibration source 14 through which the granular material in the storage tank 1 passes, and the granular material in the relay tank 11 passes and the granular material is fed to the injection means 20 at the tip. The granular material which consists of the granular material supply cylinder 16 to which the granular material supply pipe | tube 19 to be connected is connected, the granular material supply pipe | tube 19 connected to this granular material supply cylinder 16, and the injection means 20 The flow path system becomes pressurized at the same pressure as the pressure of the compressed gas supplied to the compressed gas chamber 7, and the flow of the compressed gas, for example, even in the case of a granular material having poor fluidity, It can be transported at a constant speed with improved properties.

As explained above, in order to prevent the granular material from adhering to the storage tank 1, the path, shelving, and clogging, in other words, the quantitative supply and the quantitative control thereof are performed. To facilitate
(1) The pressure from the granular storage tank 1 to the outlet of the relay pipe 13 of the relay member and the upper end opening 17 of the granular material feeding cylinder 16 was made the same (constant). Therefore, fluidity is improved.
(2) In the relay pipe 13 of the relay member, a granular material that does not interpose compressed gas was filled. As a result, the transmission of the vibration force from the vibration source is good. In addition, quantitative supply is improved.

Moreover, in the granular material supply apparatus shown in FIG.
(1) Since the storage tank 1 and the relay pipe 13 have a hermetically connected structure, even if the granular material has poor fluidity, it does not overflow into the compressed gas chamber 7 and flows into the relay pipe 13. The powder can be filled.
(2) By making the outlet of the relay pipe 13 (horizontal pipe portion 13b) obliquely upward, the filling rate of the granular material in the relay pipe 13 is improved, and the supply amount by changing the vibration intensity of the vibration source is increased. Controllability is improved. Furthermore, it is possible to accurately improve the supply / stop controllability of the granular material by turning the vibration source 14 on and off.
(3) As a result of confirming the particle size of the granular material that can be quantitatively supplied in continuous operation, the particle size that can be continuously operated and quantitatively supplied without overflow in the granular material supply device shown in FIG. 1 is # 600 (25 μm). In contrast to the above, in the supply apparatus shown in FIG. 10, it was possible to reach # 1500 (10 μm).

As described above, by improving the fluidity of the granular material, the relay pipe 13 provided in the flow channel system of the granular material is selected and designed based on the inner diameter that matches the particle size of the granular material to be handled. Further, it is possible to accurately perform a minute amount control by a combination of the vibration frequency and the vibration intensity (amplitude) of the vibration source 14.
Therefore, the present invention is an industrial value as a granular material supply device capable of variable control of high-precision quantitative supply (quantitative injection) and supply amount (injection amount), and a granular material supply method using the device. It is extremely large.

It is front sectional drawing of the granular material supply apparatus of this invention. It is the sectional view on the AA line in FIG. It is a perspective view which shows the structure at the time of using the granular material supply apparatus of this invention for an air blasting apparatus. It is a graph which shows the relationship between the frequency of the piezoelectric element used for the vibration generation source, and a granular material supply amount in case the average particle diameter of a granular material is 8 micrometers and the internal diameter of a relay pipe is 0.3 mm. It is a graph which shows the relationship between the voltage of the piezoelectric element used for the vibration generation source, and a granular material supply amount in case the average particle diameter of a granular material is 8 micrometers and the internal diameter of a relay pipe is 0.3 mm. It is a graph which shows the relationship between the frequency of the piezoelectric element used for the vibration generation source, and a granular material supply amount when the average particle diameter of a granular material is 11.5 micrometers and the internal diameter of a relay pipe is 1.0 mm. It is a graph which shows the relationship between the voltage of the piezoelectric element used for the vibration generation source, and a granular material supply amount in case the average particle diameter of a granular material is 11.5 micrometers and the internal diameter of a relay pipe is 1.0 mm. It is a graph which shows the relationship between the frequency of the piezoelectric element used for the vibration generation source, and a granular material supply amount in case the average particle diameter of a granular material is 30 micrometers and the internal diameter of a relay pipe is 3.0 mm. It is a graph which shows the relationship between the voltage of the piezoelectric element used for the vibration generation source, and a granular material supply amount in case the average particle diameter of a granular material is 30 micrometers and the internal diameter of a relay pipe is 3.0 mm. It is front sectional drawing which shows the granular material supply apparatus of another embodiment. It is a graph which shows stability of the granular material supply amount by progress of time. It is a graph which shows the influence of the voltage which acts on a granular material supply amount. It is a graph which shows the influence of the frequency which acts on a granular material supply amount.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Storage tank 1a Hopper-shaped bottom part 2 Opening part 3 Lid 4 Granule delivery pipe 5 Casing 51 Bottom plate 6 Compressed gas supply port 7 Compressed gas chamber 8 Vent pipe 8a Exhaust pipe 8b On-off valve 11 Relay tank 12 Upper end opening 13 Relay pipe 13a Longitudinal tube portion 13b Horizontal tube portion 14 Vibration source 14a Bracket 15 Vibration supply unit 16 Granule supply tube 17 Upper end opening 19 Powder supply tube 20 Injection means 21 Air blast device 22 Powder supply device 23 Compression Gas supply device 24 Control means 26 Electropneumatic proportional valve 26a Supply piping 28 Dust collection duct 29 Dust collector 31 X-axis 32 Y-axis 33 Z-axis 34 Slider driver 35 Work 36 Open / close valve 37 Cabinet 61 Pressure-resistant member 62 Inlet of powder

Claims (15)

  A casing 5 is continuously provided below a storage tank having a hopper-like bottom, and a compressed gas chamber 7 and the storage tank 1 in the casing 5 are suspended from the bottom of the storage tank 1 with a granular material delivery pipe 4. It is a granular material supply device in which a granular material supply cylinder 16 for communicating with the compressed gas chamber 7 and supplying the granular material to the outside by a compressed gas supplied to the compressed gas chamber 7 protrudes from the bottom of the casing 5. In the compressed gas chamber 7, a relay member for feeding the granular material sent from the granular material delivery pipe 4 to the granular material feeding cylinder 16 is supported by the vibration generating source 14, and the relay member is A granular material supply device, wherein the granular material supply device is disposed apart from the granular material supply cylinder.   2. The granular material supply apparatus according to claim 1, wherein the relay member is composed of the relay tube, and the relay tube is detachably attached to the granular material delivery tube.   The relay member is composed of the relay tank 11 and the relay pipe 13 connected to the lower part thereof, and the relay tank 11 is supported by the vibration generating source 14 while being separated from the granular material delivery pipe 4. The granular material supply apparatus according to claim 1.   A compressed gas supply port 6 for supplying compressed gas to the compressed gas chamber 7 is provided on the side wall of the casing 5, and a vent pipe 8 extending from the compressed gas chamber 7 to the upper side of the storage tank 1 is provided. The granular material supply apparatus according to any one of claims 1 to 3, wherein the same pressure as that of the compressed gas chamber 7 is used for the granular material feeding cylinder 16.   The relay tank 11 has an inner diameter at its upper end opening larger than that of the granular material delivery pipe 4 of the storage tank 1 and a detachable relay pipe 13 at the bottom. The granule delivery pipe 4 is inserted with a sufficient gap between them so that it does not come into contact with the granule delivery pipe 4, while the tip of the relay pipe 13 is provided at the bottom of the casing 5 The granular material supply device according to claim 3 or 4, wherein the granular material supply device is inserted with a sufficient gap so as not to come into contact with the granular material feeding cylinder.   The shape of the relay pipe 13 is an L shape in which the horizontal pipe part 13b is connected to the vertical pipe part 13a suspended from the bottom of the relay tank 11, and the tip of the horizontal pipe part 13b is provided at the bottom of the casing 5. The granular material supply apparatus according to claim 5, wherein the granular material supply cylinder is inserted into an upper end of the granular material supply cylinder from a side.   The shape of the relay pipe 13 is an L-shape in which the horizontal pipe part 13b is connected to the vertical pipe part 13a attached to the granular material delivery pipe 4, and the tip of the horizontal pipe part 13b is obliquely upward, The granular material supply device according to claim 2, wherein the granular material supply device is inserted from the side of the upper end opening 17 of the body feeding cylinder 16.   The powder supply apparatus according to any one of claims 1 to 7, wherein the vibration generating source 14 is a piezoelectric element.   An air blast in which an injection nozzle 20 is connected to the tip of the granular material supply pipe 19 connected to the granular material supply cylinder 16, the injection material is stored in the storage tank 1, and the injection material is injected from the injection nozzle 20. The granular material supply apparatus according to claim 1, wherein the granular material supply apparatus is used in the apparatus 21.   The compressed gas chamber 7, the storage tank 1, the relay member, and the granular material by supplying the compressed gas to the compressed gas chamber 7 using the granular material supply device according to claim 1. 2. A method for supplying granular material, wherein the pressure in the flow path system of the granular material reaching the feeding cylinder 16 is the same as the pressure in the compressed gas chamber 7.   Using the granular material supply apparatus according to any one of claims 1 to 9, compressed gas is supplied to the compressed gas chamber 7, the flow path system of the granular material is set to the same pressure, and the granular material A method of supplying a granular material, wherein the powder is quantitatively supplied or the supply amount is variably controlled by changing the combination of the frequency and the amplitude of the relay member.   Using the granular material supply apparatus according to any one of claims 1 to 9, the frequency of the vibration source 14 is selected and set in a range of 100 to 600 Hz and the amplitude is 70 μm or less, and the granular material is supplied. A granular material supply method characterized by:   Using the granular material supply apparatus according to any one of claims 2 to 8, a plurality of relay pipes 13 having an inner diameter of the relay pipe 13 in a range of φ0.2 to 10.0 mm are prepared, and the relays having different inner diameters are prepared. The method for supplying granular material according to claim 12, wherein the supply amount of granular material is controlled in stages by exchanging the tube 13.   14. The method for supplying granular material according to claim 12 or 13, wherein the supply amount of the granular material is controlled by changing the frequency of the vibration source 14 within a range of 100 to 600 Hz and an amplitude within a range of 70 [mu] m or less. .   The granular material supply method according to claim 12, 13 or 14, wherein the storage tank 1 is filled with a granular material having a particle size of 5 to 80 μm, and the granular material is supplied at a supply rate of 5 to 700 mg / sec.

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