Three-way pipe type compressed gas driven automatic grain counting method and device

Abstract

The invention discloses a three-way pipe type compressed air driven automatic grain counting method and device, screened granular materials with the grain size meeting the requirement fall down along a feeding pipe through a funnel, are forced to pass through a limiting small circular ring at the tail end of the feeding pipe one by one, and are quickly driven away along a discharging pipe by compressed air of an air inlet pipe after reaching a main pipe; therefore, the distance between the material particles and subsequent material particles is increased, and conditions are created for accurate counting of a needed photoelectric counter. According to the device, when compressed gas flows through the feeding pipe opening, negative pressure is formed in the feeding pipe, and therefore it is guaranteed that materials fall into the main pipe smoothly.

Description

Technical Field

[0001] The invention belongs to the field of mechanical automation, and relates to an automatic grain counting technology and a device thereof, and specifically to an automatic grain counting method and a device thereof driven by three-way pipe compressed gas. Background Art

[0002] The earliest counting device was a counting template, which had low production efficiency and high labor intensity. Then, a semi-automatic counting machine, a turntable photoelectric counting machine, appeared. The particles fell into the shut-off hole as the turntable rotated, and the particles were counted and bottled. However, since there were only one or two holes, the efficiency was still not high. The emergence of mechanical turntable counting devices has improved efficiency, but the counting error is large.

[0003] The existing technology, i.e., a fully automatic grain counting device, also called a photoelectric grain counting device, adopts a design scheme combining linear feeding and photoelectric grain counting technology in each channel, which solves the problem of grain counting and further improves the accuracy. However, the photoelectric grain counting machine also has an obvious defect, that is, when the photoelectric sensor scans the particles, if there are two or more particles close to each other, it is very easy to misjudge them as one particle, which will lead to the inability to count the particles in the case of high-speed grain counting; even for slow grain counting, the probability of misjudgment is often as high as 0.1-1%. For the less demanding grain counting requirements, this situation is allowed, but for precious particles, or for the very precise counting requirements, this situation is not allowed. Therefore, there is an urgent need for a grain counting device that can overcome the current defects of the photoelectric grain counting device and further improve the accuracy of grain counting. Summary of the invention

[0004] The purpose of the present invention is to provide a three-way pipe compressed gas driven automatic particle counting method and device. The device includes a feeding funnel for feeding, a three-way pipe structure, a photoelectric counter and other parts. The three-way pipe structure includes a main pipe and a secondary pipe, wherein the secondary pipe is a feeding pipe, the main pipe on one side of the feeding pipe outlet is an air inlet pipe, and the main pipe on the other side is a discharge pipe; the main pipe at the junction with the feeding pipe is similar to a Adam's apple, and is a throat pipe; the discharge pipe is equipped with an automatic counter, which can automatically count the material particles passing through. The device allows the material particles to quickly pass through the counting sensing area one by one, and the particles are separated by a sufficient distance so as not to interfere with each other and affect the effectiveness of the counting, thereby achieving fast and accurate counting.

[0005] In order to achieve the above object, the technical solution of the present invention is to provide an automatic particle counting method driven by a three-way pipe compressed gas, comprising the following steps: Step S1: granulate the material to reduce the difference in particle size between the material particles so that the maximum particle size D1 and the minimum particle size D2 of the batch of materials meet the relationship: 2D2>D1>D2; Step S2: putting the material into the feeding funnel, and the material flows into the feeding pipe through the feeding funnel; Step S3: A detachable and replaceable restrictive small ring is installed at the outlet end of the feed pipe, and the inner diameter of the ring is R=1.1~1.3D1<2D2. The material particles are forced to pass through here one by one, and two or more particles will not pass side by side, or the particles will not be stuck in the restrictive small ring and cannot be fed due to the particle size being too large; Step S4: The particles passing through the restrictive small ring enter the throat pipe, and compressed air is introduced into the air inlet pipe at one end of the throat pipe to immediately blow the particles entering the throat pipe out in the direction of the discharge pipe; Step S5: When the particles in the discharge pipe pass through the sensing area of ​​the photoelectric automatic counter, each time the light source is blocked, it is automatically identified and counted as one, and the values ​​are accumulated to obtain the required count.

[0006] Preferably, in step S1, the relationship between the large-aperture sieve aperture D1 and the small-aperture sieve aperture D2 is: D1=1.1~1.3D2.

[0007] Preferably, in step S4, the pressure of the introduced compressed air is 130 kPa-170 kPa.

[0008] Another object of the present invention is to provide a three-way pipe type compressed gas driven automatic counting device. The device consists of four parts: a feeding funnel, a restrictive small ring, a three-way pipe and a photoelectric counter. The three-way pipe is divided into a main pipe and a secondary pipe, and the main pipe and the secondary pipe are connected to the three-way; the secondary pipe is a feeding pipe, which is connected to the feeding funnel at the top and the main pipe at the bottom; the restrictive small ring is installed at the outlet of the feeding pipe, and the material enters the main pipe from the feeding pipe through the restrictive small ring; the main pipe is bounded by the three-way, with one side as the air inlet pipe and the other side as the discharge pipe; from the air inlet pipe to the three-way, there is a section of the main pipe whose inner diameter gradually shrinks to the smallest inner diameter at the three-way; from the three-way to the discharge pipe, there is a section of the main pipe whose inner diameter gradually expands to the same as the main pipe inner diameter, and the three-way pipe of the gradually shrinking and gradually expanding parts is called a throat pipe; the discharge pipe is equipped with a counter, which can automatically count the material particles passing through; the counter is a photoelectric automatic counter, including a light source unit and a light source sensing unit. A rectangular gap is opened on the outer wall of the discharge pipe in the light source area along the pipe diameter direction, and a gap of the same shape and size is opened on the opposite pipe wall to reach the light source sensing area. The light beam emitted by the light source unit can directly reach the light source sensing area along the pipe diameter direction.

[0009] Preferably, the inner diameter of the secondary pipe is 1 / 2 to 1 / 5 of the inner diameter of the primary pipe. Preferably, the throat has a linear tapering section with a length of 1.5 to 3 times the inner diameter of the main pipe; the expanding section has a linear expansion section with a length of 1.5 to 3 times the inner diameter of the main pipe. The narrowest part of the throat is the inner diameter of the main pipe where the perpendicular line of the center of the feeding pipe outlet is located, which is 1 / 2 to 3 / 4 of the inner diameter of the uncontracted main pipe.

[0010] Preferably, the inner diameter of the restrictive small ring is 1.1 to 1.3 times the maximum particle size D1 of the batch of materials, and the required restrictive small ring can be selected and installed according to the particle size of different materials.

[0011] Preferably, the light source unit can emit multiple light beams in parallel and at equal distances; the light source sensing unit can receive multiple light beams accordingly. When the emitted light source is in a receivable state, the counter does not count. When a material particle passes through the place and blocks one light beam or blocks two or more light beams at the same time once, the counter counts once. The required statistical number is obtained by accumulating the counts.

[0012] Working principle of the present invention: A particle size restriction device is used to allow material particles to pass through the counter sensing area one by one to avoid particles getting too close to each other and affecting the accuracy of counting; a three-way structure similar to a Venturi tube is used to generate negative pressure in the feed pipe to drive the material into the main pipe, while preventing compressed gas from overflowing into the feed pipe and affecting the feeding; particles that leave the feed pipe are immediately driven away from the feed port by the compressed gas, which increases the distance between the particles that follow closely, creating conditions for accurate counting by the photoelectric counter; the counter emits one or more light beams at equal distances in the same cross-section perpendicular to the same pipe diameter direction, and after passing through the discharge pipe, they are sensed by the opposite sensing units respectively. When material particles pass through the counting sensing area, the light source is blocked once and counted as one count; when material particles block multiple light beams once at the same time, it is still counted as one time, and the required statistical results can be obtained by accumulating multiple times.

[0013] Compared with the prior art, the three-way pipe compressed gas driven automatic grain counting method and device of the present invention has the following beneficial effects: The feed pipe outlet of the present invention is provided with a particle size limiting device, so that the material particles can pass through the sensing area of ​​the counting device one by one, and the particles are prevented from being too close to each other and affecting the counting accuracy; The three-way pipe structure is adopted. Near the throat, the diameter of the main pipe gradually shrinks towards the throat, and away from the throat, the diameter of the main pipe gradually expands. This structure is similar to the Venturi tube structure, which creates negative pressure in the direction of the feed pipe, and can suck the material into the main pipe to avoid the compressed gas in the main pipe gushing towards the secondary pipe, affecting the feed; (3) The speed of the material particles falling from the feed pipe in the direction of the main pipe is 0. The moment the material particles leave the feed pipe and enter the main pipe, they are immediately driven by the compressed gas to accelerate and leave the feed pipe mouth and enter the discharge pipe, thereby increasing the distance from the material particles still in the feed pipe, creating conditions for the counting device to accurately count; (4) The counter emits one or more light beams at equal distances in the same cross section perpendicular to the same pipe diameter. After passing through the discharge pipe, they are sensed by the opposite sensing units. When the material particles pass through the counting sensing area, the light source is blocked once, which is counted as one count; when the material particles block multiple light beams once at the same time, it is still counted as one count. The required statistical results can be obtained by accumulating multiple times. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a three-way pipe type compressed gas driven automatic particle counting device in the present invention; Figure 2 It is a front view of the restrictive small circular ring in the present invention; Figure 3 A top view of a restrictive small circular ring in the present invention; Figure 1 Middle: 1. Feed funnel; 2. Feed pipe; 3. Restrictive small ring; 4. Light source unit of counter; 5. Light source sensing unit of counter; 6. Air inlet pipe; 7. Discharge pipe; 8. The tapering part of the throat; 9. The expanding part of the throat; 10. Throat area; 11. Counter sensing area. DETAILED DESCRIPTION

[0015] The features and advantages of the present invention can be further understood by the following detailed description in conjunction with the accompanying drawings. The embodiments provided are merely illustrative of the present invention and are not intended to limit the remainder of the present invention in any way. The experimental methods in the following embodiments are conventional methods unless otherwise specified. The materials used in the following embodiments, etc., are all commercially available unless otherwise specified.

[0016] like Figure 1 As shown, the present invention is a three-way tube compressed gas driven automatic grain counting device, including a feeding funnel 1, a feeding pipe 2 connected to the bottom of the feeding funnel, a restrictive small ring 3 arranged at the bottom of the feeding pipe, an air inlet pipe 6 arranged at the bottom of the feeding pipe and perpendicular to the direction of the feeding pipe, a discharge pipe 7 arranged at the bottom of the feeding pipe and perpendicular to the direction of the feeding pipe, a tapered portion of a throat connected to the three-way at one side of the air inlet pipe, a gradually expanding portion of a throat connected to the three-way at one side of the discharge pipe, a light source unit 4 of a counter arranged at one side of the discharge pipe, and a sensing unit 5 of a counter arranged at the side opposite to the light source unit of the discharge pipe.

[0017] The material enters the feed pipe through the feed funnel; the material enters the restrictive small ring from the feed pipe; the inner diameter of the restrictive small ring limits the material particles to pass through the restrictive small ring one by one, and all of them can pass through the restrictive small ring to reach the throat of the main pipe; when the compressed gas passes through the throat, a negative pressure is formed in the feed pipe, which prompts the material to pass through the restrictive small ring into the main pipe and be immediately blown into the discharge pipe by the compressed gas of the air inlet pipe; the discharge pipe is equipped with a photoelectric induction counter, and the material passes through the counter one by one. When passing through the sensing area, the light source is blocked once and counted once; the photoelectric sensing counter can emit one or more light beams, each of which can be sensed independently by the sensor. When a material particle passes through the sensing area, one or more light beams are blocked at the same time, and the counter senses and counts once; the light source beam can be one or more beams. When there is only one light source, it passes through the inner diameter of the tube and reaches the sensing unit. When there are multiple light sources, the light sources pass through the same tube section side by side at equal distances and reach the sensing unit. Regardless of whether it is a single light source or multiple light sources, all the smallest particle size particles passing through should be sensed.

[0018] Example 1 Peanuts with a particle size of 8-11 mm A batch of peanuts was screened through sieves with 8mm and 11mm mesh sizes to obtain 10,000 peanuts with uniform particle sizes of 8-11mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 12mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradually contracting inner diameter of the air inlet pipe to the datum line is 70mm, and the length from the end of the gradually expanding inner diameter of the discharge pipe to the datum line is 70mm, and the inner diameter at the narrowest part is 25mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.16Mpa; the counting device is turned on to start counting. Pour all the peanuts into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 83 seconds, all the peanuts are counted, and 10,000 are counted, with a deviation of 0, which has significant counting significance.

[0019] Example 2 Pearl particles with a particle size of 6-8 mm A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1As shown, the inner diameter of the selected restrictive small ring is 9mm, the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradual contraction of the inner diameter of the inlet pipe to the datum line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the datum line is 70mm, and the inner diameter of the narrowest part is 25mm; compressed air is introduced into the inlet pipe with a pressure of 0.16Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 76 seconds, all the pearls are counted, and 10,000 are counted, with a deviation of 0, which has significant counting significance.

[0020] Example 3 Pearl particles with a particle size of 6-8 mm A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 9mm, the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 30mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the datum line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the datum line is 100mm, and the inner diameter at the narrowest point is 21mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.16Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 76 seconds, all the pearls are counted, and 10,000 are counted, with a deviation of 0, which has significant counting significance.

[0021] Example 4 Pearl particles with a particle size of 6-8 mm A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 9mm, the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 30mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the datum line is 50mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the datum line is 50mm, and the inner diameter of the narrowest part is 21mm; compressed air is introduced into the air inlet pipe with a pressure of 0.16Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 76 seconds, all the pearls are counted, and 10,000 are counted, with a deviation of 0, which has significant counting significance.

[0022] Comparative Example 1 The large-aperture screen aperture D1 and the small-aperture screen aperture D2 do not meet the requirement of 2D2>D1>D2 A batch of pearl material was screened through sieves with 3mm and 8mm mesh sizes (2X3mm<8mm) to obtain 10,000 pearls with uniform particle sizes of 3-8mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 9mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the datum line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the datum line is 70mm, and the inner diameter of the narrowest part is 21mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.16Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 75 seconds, all the pearls are counted, and 9630 are counted, with a deviation of -370 and a deviation rate of -3.7%, which has no counting significance.

[0023] Comparative Example 2 The inner diameter of the restrictive small ring R>2 times the aperture of the small hole screen D2 A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter R of the selected restrictive small ring is 13mm, and the inner diameter of the feed pipe is 15mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 30mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the reference line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the reference line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the reference line is 70mm, and the inner diameter of the narrowest part is 21mm; compressed air is introduced into the air inlet pipe with a pressure of 0.16Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 68 seconds, all the pearls were counted, and 9573 were counted, with a deviation of -427 and a deviation rate of -4.27%, which has no counting significance.

[0024] Comparative Example 3 The inner diameter of the restrictive small ring is less than 1.1 times the aperture of the large-pore sieve D1 A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1As shown, the inner diameter of the selected restrictive small ring is 8.4mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the dart line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the dart line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the dart line is 70mm, and the inner diameter at the narrowest part is 25mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.16Mpa; the counting device is turned on to start counting. All of this batch of pearls are poured into the feed funnel, freely fall through the feed pipe, and all pass through the restrictive small ring. After 792 seconds, all the grains are counted, and 10,000 grains are counted, with a deviation of 0, which has significant counting significance, but the time used is 10.4 times that of Example 2, which is not economically feasible.

[0025] Comparative Example 4 Compressed air pressure <0.13MPa A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 9mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the datum line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the datum line is 70mm, and the inner diameter of the narrowest part is 25mm; compressed air is introduced into the air inlet pipe with a pressure of 0.12Mpa; the counting device is turned on to start counting. Pour all the pearls into the feed funnel, fall freely through the feed pipe, and all pass through the restrictive small ring. After 231 seconds, all the pearls were counted, and 9552 were counted, with a deviation of -448 and a deviation rate of -4.48%, which has no counting significance.

[0026] Comparative Example 5 Compressed air pressure > 0.17 MPa A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter of the selected restrictive small ring is 9mm, the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradually contracting inner diameter of the air inlet pipe to the datum line is 70mm, and the length from the end of the gradually expanding inner diameter of the discharge pipe to the datum line is 70mm, and the inner diameter of the narrowest part is 25mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.23Mpa; the counting device is turned on to start counting. All the pearls are poured into the feed funnel, freely fall through the feed pipe, and all pass through the restrictive small ring. After 231 seconds, all the pearls are counted, and 10,000 are counted, with a deviation of 0% and a deviation rate of 0%, which is meaningful for counting, but 129 pearls are broken, which is not economically feasible.

[0027] Comparative Example 6: The Adam's apple area of ​​the main tube does not adopt the gradual contraction and expansion structure A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1 As shown, the inner diameter of the restrictive small ring is 9mm, the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe is 35mm, and there is no gradual contraction and expansion structure; compressed air is introduced into the air inlet pipe with a pressure of 0.16Mpa; the counting device is turned on to start counting. All the pearls are poured into the feed funnel, but the compressed gas gushes in the opposite direction from the feed pipe, causing the pearls to fail to fall and the device to fail to count.

[0028] Comparative Example 7: No restrictive ring A batch of pearl material was screened through 6mm and 8mm mesh screens to obtain 10,000 pearls with uniform particle size of 6-8mm. The inner diameter of the feed pipe is 20mm, and it is directly connected to the main pipe without restrictive small ring; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the datum line, the length from the beginning of the gradually contracting point of the inlet pipe to the datum line is 70mm, and the length from the end of the gradually expanding point of the discharge pipe to the datum line is 70mm, and the inner diameter of the narrowest part is 25mm; compressed air is introduced into the inlet pipe at a pressure of 0.16Mpa; the counting device is turned on to start counting. All the pearls are poured into the feed funnel, freely fall through the feed pipe, and all pass through the restrictive small ring. After 76 seconds, all the grains are counted, and 8792 grains are counted, with a deviation of -1208 grains and a deviation rate of -12.08%, which has no counting significance.

[0029] Comparative Example 8 The minimum inner diameter of the throat part is greater than 3 / 4 of the inner diameter of the main pipe. A batch of pearl material was screened through sieves with 6mm and 8mm mesh sizes to obtain 10,000 pearls with uniform particle sizes of 6-8mm. Figure 1As shown, the inner diameter of the selected restrictive small ring is 9mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; the straight line perpendicular to the center of the inner diameter of the restrictive small ring is used as the dart line, the length from the beginning of the gradual contraction of the inner diameter of the inlet pipe to the dart line is 70mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the dart line is 70mm, and the inner diameter of the narrowest part is 29mm (>the inner diameter of the main pipe 35mmX3 / 4); compressed air is introduced into the inlet pipe with a pressure of 0.16Mpa; the counting device is turned on to start counting. All the pearls were poured into the feed funnel, but the material did not pass through the feed pipe smoothly, and there were 13 times of jamming and no material was discharged. Each time, the device needed to be shaken vigorously to complete the counting. It took 436 seconds for all to pass through the restrictive small ring, and 10,000 grains were counted, with a deviation of 0, which has significant counting significance. However, compared with Example 2, the time consumption increased by 4.7 times, and 13 material unloading jams occurred during the process, which is not economical.

[0030] Comparative Example 9 The lengths of the tapered and expanded sections of the throat are both greater than 3 times the inner diameter of the main pipe. A batch of peanuts was screened through sieves with 8mm and 11mm mesh sizes to obtain 10,000 peanuts with uniform particle sizes of 8-11mm. Figure 1 As shown, the inner diameter of the selected restrictive small circular ring is 12mm, and the inner diameter of the feed pipe is 20mm; the inner diameter of the main pipe (excluding the gradually expanding and contracting parts) is 35mm; taking the straight line perpendicular to the center of the inner diameter of the restrictive small circular ring as the dart line, the length from the beginning of the gradual contraction of the inner diameter of the air inlet pipe to the dart line is 170mm, and the length from the end of the gradual expansion of the inner diameter of the discharge pipe to the dart line is 170mm, and the inner diameter at its narrowest point is 25mm; compressed air is introduced into the air inlet pipe, and the pressure is 0.16Mpa; the counting device is turned on to start counting. Pour all the peanuts into the feed funnel, and they fall freely through the feed pipe and all pass through the restrictive small circular ring. However, the feed pipe got stuck and blocked 19 times in the middle, and it was necessary to knock and shake it hard to complete the counting. It took 689 seconds to count all the grains, and the count was 10,000, with a deviation of 0, which has significant counting significance. However, it takes 8.1 times longer than Example 2, which is not economical.

[0031] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A three-way pipe compressed gas driven automatic counting method, characterized in that The following steps are involved: Step S1: sieving and granulating the material before counting to reduce the difference in particle size between the material particles; Step S2: putting the material into the feeding funnel, and the material flows into the feeding pipe through the feeding funnel; Step S3: A detachable and replaceable restrictive small ring is installed at the outlet end of the feed pipe, and the material particles are forced to pass through it one by one, so that two or more particles will not pass side by side, or the particles with too large a size will be stuck and unable to feed; Step S4: The particles passing through the restrictive small ring enter the throat pipe, and compressed air is introduced into the air inlet pipe at one end of the throat pipe to immediately blow the particles entering the throat pipe out in the direction of the discharge pipe; Step S5: When the particles in the discharge pipe pass through the sensing area of ​​the photoelectric automatic counter, each time the light source is blocked, it is automatically identified and counted as one, and the values ​​are accumulated to obtain the required count.

2. The three-way pipe compressed gas driven automatic counting method according to claim 1, characterized in that: In step S1, the material is sieved with a large-aperture sieve and a small-aperture sieve respectively to obtain particles that can pass through the large-aperture sieve but cannot pass through the small-aperture sieve.

3. The three-way pipe compressed gas driven automatic counting method according to claim 2, characterized in that: After the material is screened and sized, the maximum particle size D1 and the minimum particle size D2 of the batch of material meet the relationship: 2D2>D1>D2.

4. The three-way pipe compressed gas driven automatic counting method according to claim 1, characterized in that: In step S3, the restrictive small ring has different inner diameter specifications to choose from. The selected inner diameter R of the restrictive small ring is determined by the maximum particle size D1 and the minimum particle size D2 of the material. The inner diameter R meets the relationship of R=1.1~1.3D1 and R<2D2.

5. The three-way pipe compressed gas driven automatic counting method according to claim 1, characterized in that: In step S4, the pressure of the introduced compressed air is 130 kPa~170 kPa.

6. Another object of the present invention is to provide a three-way pipe type compressed gas driven automatic counting device. The device consists of a feeding funnel, a restrictive small ring, a three-way pipe and a photoelectric counter. The three-way pipe is divided into a main pipe and a secondary pipe, and the main pipe and the secondary pipe are connected to the three-way; the secondary pipe is a feeding pipe, which is connected to the feeding funnel at the top and the main pipe at the bottom; the restrictive small ring is installed at the outlet of the feeding pipe, and the material enters the main pipe from the feeding pipe through the restrictive small ring; the main pipe is bounded by the three-way, with one side as the air inlet pipe and the other side as the discharge pipe; from the air inlet pipe to the three-way, there is a section of the main pipe with a gradually shrinking inner diameter to the smallest inner diameter at the three-way; from the three-way to the discharge pipe, there is a section of the main pipe with a gradually expanding inner diameter to the same as the main pipe inner diameter, and the three-way pipe including the gradually shrinking and expanding parts is called a throat pipe; the discharge pipe is equipped with a counter, which can automatically count the material particles passing through; the counter is a photoelectric automatic counter, including a light source unit and a light source sensing unit. A rectangular gap is opened on the outer wall of the discharge pipe in the light source area along the pipe diameter direction, and a gap of the same shape and size is opened on the opposite pipe wall to reach the light source sensing area. The light beam emitted by the light source unit can directly reach the light source sensing area along the pipe diameter direction.

7. The three-way pipe compressed gas driven automatic grain counting device according to claim 6, characterized in that: The inner diameter of the secondary pipe is 1 / 2 to 1 / 5 of the inner diameter of the main pipe.

8. The three-way pipe compressed gas driven automatic grain counting device according to claim 6, characterized in that: The throat pipe has a linear tapering section with a length of 1.5 to 3 times the inner diameter of the main pipe; the gradually expanding section has a linear gradually expanding section with a length of 1.5 to 3 times the inner diameter of the main pipe. The narrowest part of the throat pipe is the inner diameter of the main pipe where the vertical line of the center of the feeding pipe outlet is located, which is 1 / 2 to 3 / 4 of the inner diameter of the uncontracted main pipe.

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