A pneumatic pipeline conveyor for furniture board processing

Abstract

The present invention belongs to the field of furniture processing. The present invention relates to a pneumatic pipeline conveyor for furniture board processing, including a conveyor barrel and a check valve connected to a gas source. The high-pressure gas generated by the gas source provides pneumatic driving force to the inside of the conveyor barrel through the check valve. A pneumatic high-frequency disturbance device for converting the constant air pressure output by the check valve into high-frequency fluctuating air pressure is also installed at the tail of the conveyor barrel. The change frequency of the high-frequency fluctuating air pressure is 1-11 Hz, and the change range of the air pressure value is 25-95 kPa. Using the pneumatic pipeline conveyor for furniture board processing described in the present invention to transport paint with high viscosity has a significant improvement effect on the adhesion to the inner wall of the pipeline. Using the pneumatic pipeline conveyor for furniture board processing described in the present invention to transport the mixed glue used for making particleboard, the high-frequency impact force generated can perform high-frequency impact on the mixed glue, thereby significantly improving the nail-holding force of the particleboard and making the internal structure of the particleboard more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of furniture processing, and specifically to a pneumatic pipeline conveyor for furniture board processing. Background Art

[0002] In the field of furniture board processing, in the processes of making particleboard / flakeboard, board painting, etc., a pneumatic pipeline conveyor is usually required to transport mixed glue or paint. Particleboard is a board formed by mixing sawdust, wood chips and other wood residues with an adhesive and then pressing under high temperature and high pressure. Flakeboard is a board formed by adding wood chips and an adhesive and then pressing into shape. Mixed glue generally refers to a mixture formed by mixing wood fiber materials such as wood chips and sawdust with an adhesive.

[0003] In the field of furniture board processing, the conveying air pressure of the pneumatic pipeline conveyor for paint is generally 0.4 - 0.6 MPa, and the conveying air pressure for mixed glue is generally 0.5 - 1.3 MPa. In existing air compressors, the generated air pressure is constant; even through frequency conversion technology (such as existing variable frequency air compressors), it is impossible to quickly and frequently change the air pressure value in a short time. The output air pressure switching time of variable frequency air compressors is usually between several seconds and several minutes. For a pneumatic pipeline conveyor with a large load, when the conveying air pressure is greater than or equal to 0.4 MPa, the output air pressure switching time is usually greater than 10 s. That is to say, the change frequency of the output air pressure is less than 0.1 Hz.

[0004] The R & D personnel of our unit have found through a large amount of research that for the change frequency of the output air pressure, if it can be greater than 1 Hz and the change range of the air pressure value is not particularly drastic (such as 25 - 95 kPa), for paint with a relatively high viscosity, it can significantly reduce its adhesion to the inner wall of the pipeline, and the solid content of the paint adhering to the inner wall of the pipeline will be significantly reduced. After long-term use, the paint adhering to the inner wall of the pipeline of existing pneumatic pipeline conveyors is likely to accumulate a large amount of high-solid-content paint. Even for the same formula paint with different viscosities, when switching the paint, it will cause certain mutual interference, thus affecting the painting effect. The common method to solve this problem is to increase the cleaning frequency of the pipeline, and the consumption of organic solvents used for cleaning is very large, and the cleaning cost is high.

[0005] Based on this, the present invention is proposed. Summary of the Invention

[0006] Aiming at the deficiencies existing in the prior art, the present invention provides a pneumatic pipeline conveyor for furniture board processing, and its technical solution is as follows:

[0007] A pneumatic pipeline conveyor for processing furniture boards, comprising a conveyor barrel and a check valve connected to a gas source. The check valve is installed at the tail of the conveyor barrel. The high-pressure gas generated by the gas source provides pneumatic driving force into the interior of the conveyor barrel through the check valve. The air pressure of the high-pressure gas generated by the gas source is greater than or equal to 400 kPa. A pneumatic high-frequency disturbance device for converting the constant air pressure output by the check valve into high-frequency fluctuating air pressure is also installed at the tail of the conveyor barrel. The change frequency of the high-frequency fluctuating air pressure is 1-11 Hz, and the change range of the air pressure value of the high-frequency fluctuating air pressure is 25-95 kPa.

[0008] As a further solution of the present invention, the pneumatic high-frequency disturbance device includes a pipe body. Inside the pipe body, there are two axially symmetrically distributed conical shells. The large ends of the two conical shells are adjacent to each other, and the large ends of both conical shells are hermetically connected to the inner wall of the pipe body. The internal space of the pipe body is divided by the two conical shells into a first intake chamber outside the first conical shell, a middle chamber between the two conical shells, and a first outlet chamber outside the second conical shell. An intake hole is provided at the small end of the first conical shell, and an outlet hole is provided at the small end of the second conical shell. A honeycomb high-frequency vibration assembly is arranged in the center of the middle chamber. A sealing glue layer is hermetically arranged between the edge of the honeycomb high-frequency vibration assembly and the inner wall of the pipe body. The middle chamber is divided by the honeycomb high-frequency vibration assembly and the sealing glue layer into a second intake chamber communicating with the intake hole and a second outlet chamber communicating with the outlet hole. The honeycomb high-frequency vibration assembly includes a honeycomb vibration plate, an ultrasonic transducer on one side of the honeycomb vibration plate, and a megasonic transducer on the other side of the honeycomb vibration plate. The first intake chamber is communicated with the output end of the check valve, and the first outlet chamber is communicated with the inner cavity of the conveyor barrel.

[0009] As a further solution of the present invention, the honeycomb vibration plate includes two metal pressing plates and an elastic layer located between the two metal pressing plates. A honeycomb hole structure for communicating the second intake chamber and the second outlet chamber is arranged on the side wall of the elastic layer.

[0010] As a further solution of the present invention, the honeycomb hole structure includes a first round hole group arranged along the length direction of the elastic layer and two double-row hole units. The two double-row hole units are respectively located on both sides of the first round hole group and are symmetrically arranged. The double-row hole unit includes two groups of double-row hole groups. The first round hole group is composed of a plurality of first round holes arranged along the length direction of the elastic layer. The double-row hole group is composed of a plurality of second round holes and regular hexagonal holes arranged at intervals with the second round holes. Both the second round holes and the second round holes are arranged along the length direction of the elastic layer. In the double-row hole unit, the second round holes in the first double-row hole group and the second round holes in the second double-row hole group are arranged in a staggered manner.

[0011] As a further solution of the present invention, the area of the first round hole is equal to that of the second round hole, and the area of the second round hole is equal to that of the regular hexagon hole.

[0012] As a further solution of the present invention, the ratio of the area of the air outlet hole to that of the air inlet hole is x, where 1.6 ≤ x ≤ 2.

[0013] As a further solution of the present invention, the power of the megasonic transducer is equal to that of the ultrasonic transducer, and the ratio of the frequency of the megasonic transducer to that of the ultrasonic transducer is 47.

[0014] As a further solution of the present invention, the frequency of the ultrasonic transducer is 20 - 30 kHz, and the frequency of the megasonic transducer is 940 - 1410 kHz.

[0015] As a further solution of the present invention, it further includes a feeding mechanism for conveying fluid materials into the conveyor barrel. The feeding mechanism includes a hopper and a vertical feeding pipe. The upper end of the vertical feeding pipe is communicated with the lower end of the hopper, and a feeding hole communicated with the lower end of the vertical feeding pipe is arranged on the upper side of the tail of the conveyor barrel.

[0016] As a further solution of the present invention, a spiral stirring blade is arranged inside the vertical feeding pipe. A stirring shaft is arranged in the center of the spiral stirring blade, and the upper end of the stirring shaft passes through the hopper and is located above the hopper.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The pneumatic pipeline conveyor for furniture board processing of the present invention is equipped with a pneumatic high-frequency disturbance device on the basis of the existing pneumatic pipeline conveyor, so that the constant air pressure is converted into high-frequency fluctuating air pressure. The change frequency of the high-frequency fluctuating air pressure is 1 - 11 Hz, and the change range of the air pressure value is 25 - 95 kPa.

[0019] 2. Using the pneumatic pipeline conveyor for furniture board processing of the present invention to convey paint with high viscosity has a significant improvement effect on the adhesion to the inner wall of the pipeline.

[0020] 3. Using the pneumatic pipeline conveyor for furniture board processing of the present invention to convey the mixed glue material for making particleboard, the high-frequency impact force generated can perform high-frequency impact on the mixed glue material, thereby significantly improving the nail-holding force of the particleboard and making the internal structure of the particleboard more stable. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a pneumatic pipeline conveyor for furniture board processing;

[0022] Figure 2 It is a schematic structural diagram of the pneumatic high-frequency disturbance device;

[0023] Figure 3 It is a schematic structural diagram of a honeycomb vibration plate. Specific embodiments

[0024] The present invention will be described in detail below in conjunction with specific embodiments. The following described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention. Embodiment 1

[0025] As Figure 1 shown, a pneumatic pipeline conveyor for processing furniture boards includes a conveyor barrel 10 and a check valve 30 connected to a gas source. The check valve 30 is installed at the tail of the conveyor barrel 10; the high-pressure gas generated by the gas source provides pneumatic driving force to the inside of the conveyor barrel 10 through the check valve 30, and the air pressure of the high-pressure gas generated by the gas source is greater than or equal to 400 kPa. The gas source is generally an air compressor, which can output a stable air pressure.

[0026] An air pressure high-frequency disturbance device 20 for converting the constant air pressure output by the check valve 30 into a high-frequency fluctuating air pressure is also installed at the tail of the conveyor barrel 10. The change frequency of the high-frequency fluctuating air pressure is 1 - 11 Hz; compared with the situation where the change frequency of the air pressure output by the existing air compressor is less than 0.1 Hz, the change frequency of the high-frequency fluctuating air pressure in the present invention is 1 - 11 Hz, which is increased by 10 times and belongs to high-frequency fluctuation.

[0027] The change range of the air pressure value of the high-frequency fluctuating air pressure is 25 - 95 kPa.

[0028] Generally, the air pressure generated by an air compressor is constant. Even through frequency conversion technology, it is impossible to quickly and frequently change the air pressure value in a short time. In addition, the main function of the check valve is to prevent the reverse flow of the fluid and ensure one-way flow; therefore, under normal circumstances, the check valve can keep the pressure on the output side constant. The combination of the two makes the air pressure output by the check valve 30 in the present invention constant, that is, constant air pressure under normal circumstances.

[0029] Change range of air pressure value: The difference between the maximum air pressure and the minimum air pressure of the high-frequency fluctuating air pressure.

[0030] Change frequency of high-frequency fluctuating air pressure: The number of repetitions of the air pressure fluctuations generated by the high-frequency fluctuating air pressure per unit time. Embodiment 2

[0031] Based on Embodiment 1, as Figure 2As shown, the air pressure high-frequency disturbance device 20 includes a tube body 21. Inside the tube body 21, there are two conical shells 22 distributed axially symmetrically. The large ends of the two conical shells 22 are adjacent to each other, and the large ends of both conical shells 22 are hermetically connected to the inner wall of the tube body 21. The internal space of the tube body 21 is divided by the two conical shells 22 into a first intake cavity 28 outside the first conical shell 22, a middle chamber between the two conical shells 22, and a first outlet cavity 29 outside the second conical shell 22. An intake hole 222 is provided at the small end of the first conical shell 22, and an outlet hole 221 is provided at the small end of the second conical shell 22. A honeycomb high-frequency vibration assembly is provided in the center of the middle chamber. A sealant layer 24 (preferably made of epoxy resin adhesive) is hermetically provided between the edge of the honeycomb high-frequency vibration assembly and the inner wall of the tube body 21. The middle chamber is divided by the honeycomb high-frequency vibration assembly and the sealant layer 24 into a second intake cavity 25 communicating with the intake hole 222 and a second outlet cavity 23 communicating with the outlet hole 221. The honeycomb high-frequency vibration assembly includes a honeycomb vibrating plate 26, an ultrasonic transducer 27 on one side of the honeycomb vibrating plate 26, and a megasonic transducer on the other side of the honeycomb vibrating plate 26. The first intake cavity 28 communicates with the output end of the check valve 30, and the first outlet cavity 29 communicates with the inner cavity of the conveyor barrel 10.

[0032] The large end of the conical shell refers to the end with the largest opening diameter.

[0033] As Figure 3 As shown, the honeycomb vibrating plate 26 includes two metal pressing plates 261 and an elastic layer 262 (preferably made of silicone rubber) between the two metal pressing plates 261. The side wall of the elastic layer 262 is provided with a honeycomb hole structure for communicating the second intake cavity 25 and the second outlet cavity 23.

[0034] The honeycomb hole structure includes a first round hole group 263 arranged along the length direction of the elastic layer 262 and two double-row hole units. The two double-row hole units are respectively located on both sides of the first round hole group 263 and are symmetrically arranged. The double-row hole unit includes two groups of double-row hole groups 264. The first round hole group 263 is composed of a plurality of first round holes 2631 arranged along the length direction of the elastic layer 262. The double-row hole group 264 is composed of a plurality of second round holes 2642 and regular hexagon holes 2641 arranged at intervals with the second round holes 2642. Both the second round holes 2642 and the second round holes 2642 are arranged along the length direction of the elastic layer 262. In the double-row hole unit, the second round holes 2642 in the first double-row hole group 264 are arranged staggeredly with the second round holes 2642 in the second double-row hole group 264.

[0035] The area of the first round hole 2631 is equal to the area of the second round hole 2642, and the area of the second round hole 2642 is equal to the area of the regular hexagon hole 2641.

[0036] The ratio of the area of the air outlet hole 221 to the area of the air inlet hole 222 is x, where 1.6 ≤ x ≤ 2.

[0037] The power of the megasonic transducer is equal to the power of the ultrasonic transducer 27, both being 80 W; the ratio of the frequency of the megasonic transducer to the frequency of the ultrasonic transducer 27 is 47.

[0038] The frequency of the ultrasonic transducer 27 is 20 - 30 kHz, and the frequency of the megasonic transducer is 940 - 1410 kHz.

[0039] The working principle of the pneumatic high-frequency perturbation device 20:

[0040] High-pressure gas enters the second air inlet cavity 25 through the air inlet hole 222, and after passing through the honeycomb hole structure of the honeycomb vibrating plate 26, it enters the second air outlet cavity 23. When the high-pressure gas passes through the honeycomb hole structure, due to the double high-frequency vibrations of the megasonic transducer and the ultrasonic transducer 27, the first round holes 2631, the second round holes 2642, and the regular hexagonal holes 2641 in the honeycomb hole structure are continuously deformed. As a result, after the high-pressure gas passes through the honeycomb hole structure, the air pressure value will fluctuate violently. Finally, the high-pressure gas in the second air outlet cavity 23 enters the conveyor barrel 10 through the air outlet hole 221. In the above process, the driving of the megasonic transducer and the ultrasonic transducer 27 causes the elastic layer 262 to vibrate continuously and the honeycomb hole structure to deform continuously, so as to be able to perform high-frequency perturbation on the high-pressure gas.

[0041] When high-pressure gas with a constant air pressure (i.e., the initial air pressure, the air pressure is greater than or equal to 400 kPa, which is the output air pressure of the air source) passes through the pneumatic high-frequency perturbation device 20, it is converted into high-frequency fluctuating air pressure. The change frequency of the high-frequency fluctuating air pressure is 1 - 11 Hz, and the change range of the air pressure value of the high-frequency fluctuating air pressure is 25 - 95 kPa.

[0042] The parameter changes of the pneumatic high-frequency perturbation device 20 and the perturbation effect on high-pressure gas are shown in Table 1:

[0043] Table 1

[0044]

[0045] As can be seen from Table 1, it is necessary to satisfy that "the frequency of the ultrasonic transducer 27 is 20 - 30 kHz, the frequency of the megasonic transducer is 940 - 1410 kHz, and the ratio of the frequency of the megasonic transducer to the frequency of the ultrasonic transducer 27 is 47" in order to make "the change frequency of the high-frequency fluctuating air pressure is 1 - 11 Hz, and the change range of the air pressure value of the high-frequency fluctuating air pressure is 25 - 95 kPa".

[0046] In addition, it was found in the experiment that if the power of the megasonic transducer is not equal to that of the ultrasonic transducer, although the change frequency of the high-frequency fluctuating air pressure is still less than 15 Hz, the change amplitude of the air pressure value of the high-frequency fluctuating air pressure will exceed 120 kPa. For example, when the power of the ultrasonic transducer is 100 W and the power of the megasonic transducer is 80 W, even if the frequency is the same as that in Example 2 and the change frequency of the high-frequency fluctuating air pressure is 8 Hz, the change amplitude of the air pressure value of the high-frequency fluctuating air pressure is 136 kPa.

[0047] Paint Pneumatic Conveying Wall Adhesion Characterization Test

[0048] The paint is divided into water-based paint and nitro paint; the conveying air pressure of the paint is 0.4 MPa.

[0049] Parameters of water-based paint: solid content 40% ± 1%; viscosity: 22 ± 1 s (Coat-4 cup, 25 °C).

[0050] Parameters of nitro paint: solid content 40% ± 1%; viscosity: 1000 ± 10 s (Coat-4 cup, 25 °C).

[0051] A pneumatic pipeline conveyor (such as an existing pneumatic pipeline conveyor or the pneumatic pipeline conveyor for furniture board processing described in Example 2) is used to convey the paint with a conveying flow rate of 36 L / min and adopts cyclic feeding. After cumulative conveying for 36 h, samples are taken from the head (i.e., the barrel opening) of the conveyor barrel, and the sampling position is the inner wall 10 cm away from the barrel opening. The solid content of the inner wall paint sample after sampling is measured. The greater the solid content of the inner wall paint sample, it indicates that during the long-term pneumatic conveying process, the paint adheres seriously to the inner wall of the pipeline, and the solid content of the adhered paint will increase significantly, which will affect the subsequent use effect of the paint.

[0052] The existing pneumatic pipeline conveyor refers to that compared with Example 2, the air pressure high-frequency disturbance device 20 is not installed.

[0053] The test results are shown in Table 2:

[0054] Table 2

[0055]

[0056] As can be seen from Table 2, when using the pneumatic pipeline conveyor for furniture board processing according to the present invention to convey the paint with low viscosity, there is no significant improvement in the adhesion to the inner wall of the pipeline; but for the paint with relatively high viscosity, there is a significant improvement in the adhesion to the inner wall of the pipeline.

[0057] When some parameters of the air pressure high-frequency disturbance device change, resulting in changes in the change frequency of the high-frequency fluctuating air pressure and the change amplitude of the air pressure value of the high-frequency fluctuating air pressure, the influence on the solid content of the adhered paint (tested according to the paint pneumatic conveying wall adhesion characterization test) is shown in Table 3:

[0058] Table 3

[0059]

[0060] As can be seen from Table 3, when the change frequency of the high-frequency fluctuating air pressure is 1 - 11 Hz and the change amplitude of the air pressure value of the high-frequency fluctuating air pressure is 25 - 95 kPa, it can significantly improve the solid content of the adhered paint. If the change amplitude of the air pressure value is too large, on the contrary, it will cause the solid content of the adhered paint to increase. If the change frequency is too large, there is almost no improvement in the solid content of the adhered paint.

[0061] Furniture board nail-holding force improvement test

[0062] 1. During the production of particleboard and granule board, a pneumatic pipeline conveyor is used to transport the mixed glue material, and the nail-holding force of the finally produced particleboard and granule board is tested. The production and testing standards meet the requirements of GB / T 4897 - 2015. The results are shown in Table 4:

[0063] Table 4

[0064]

[0065] In Table 4, Condition 1 means that the length of the conveyor barrel exceeds 3 m (for example, 3.5 m), the conveyor barrel is inclined upward (for example, the angle between its length direction and the horizontal plane is 20°), the change frequency of the high-frequency fluctuating air pressure is 10 - 11 Hz, and the change amplitude of the air pressure value of the high-frequency fluctuating air pressure is greater than or equal to 25 kPa (such as 63 kPa).

[0066] Condition 2 means that the length of the conveyor barrel is 3.5 m and the angle between the length direction of the conveyor barrel and the horizontal plane is 20°.

[0067] As can be seen from Table 4, when the air pressure high-frequency disturbance device 20 is in an inclined state of the conveyor barrel, it can generate high-frequency impact force. This impact force will make the combination between various types of particles and the binder inside the particleboard denser and more uniform in distribution, thus significantly improving the nail-holding force of the particleboard and making the internal structure of the particleboard more stable (the nail-holding force does not significantly deteriorate after multiple nail insertions). However, there is no obvious improvement for the granule board because the particle composition inside the granule board is single.

[0068] Table 5

[0069]

[0070] The difference between Condition 3 and Condition 1 is only that the conveyor barrel is horizontally arranged, and the rest are the same.

[0071] The difference between Condition 4 and Condition 1 is only that the change frequency of the high-frequency fluctuating air pressure is 9 Hz and the change amplitude of the air pressure value of the high-frequency fluctuating air pressure is 95 kPa, and the rest are the same.

[0072] The difference between Condition 5 and Condition 1 is only that the change frequency of the high-frequency fluctuating air pressure is 3 Hz and the amplitude of the change in the air pressure value of the high-frequency fluctuating air pressure is 25 kPa, and the rest are the same.

[0073] As can be seen from Table 5, to improve the internal structure of the particle board, it is necessary to meet the requirements of Condition 1.

[0074] It should be noted that if the conveyor barrel is horizontally arranged, for transporting nitro paint, there is no significant improvement in the adhesion to the inner wall of the pipeline (the solid content corresponding to the horizontal arrangement is 59%, and the solid content corresponding to the inclined arrangement is 61%). Example 3

[0075] The pneumatic pipeline conveyor for processing furniture boards further includes a feeding mechanism for feeding fluid materials into the conveyor barrel 10. The feeding mechanism includes a hopper 12 and a feeding vertical pipe 11. The upper end of the feeding vertical pipe 11 is communicated with the lower end of the hopper 12, and a feeding hole communicated with the lower end of the feeding vertical pipe 11 is arranged on the upper side of the tail of the conveyor barrel 10.

[0076] The fluid material refers to a mixed adhesive or paint, and the mixed adhesive or paint is fed into the conveyor barrel 10 through the hopper 12 and the feeding vertical pipe 11.

[0077] However, since the fluid material is transported in the conveyor barrel 10 by a high pressure above 0.4 MPa; if the volume of the hopper 12 is small, it is impossible to avoid the high-pressure gas in the conveyor barrel 10 from overflowing to the hopper 12 through the feeding hole due to the gravity and viscosity of the fluid material itself, resulting in air leakage at the hopper 12. Based on this, the following improvements can be made:

[0078] A spiral stirring blade 13 is arranged inside the feeding vertical pipe 11, a stirring shaft 14 is arranged in the center of the spiral stirring blade 13, and the upper end of the stirring shaft 14 passes through the hopper 12 and is located above the hopper 12.

[0079] There are many devices for driving the stirring shaft 14 to rotate. For example, the motor drives the stirring shaft 14 to rotate through chain drive or belt drive, which is the prior art and will not be elaborated here.

[0080] Driving the spiral stirring blade 13 by the stirring shaft 14 can further feed the material, and can also make the spiral stirring blade 13 and the fluid material around it form a dynamic seal at the feeding vertical pipe 11, thereby effectively preventing the high-pressure gas in the conveyor barrel 10 from overflowing to the hopper 12. Comparative Example 1

[0081] The difference between this example and Example 2 is only that in this example, two sets of megasonic transducers are used, that is, one of the megasonic transducers is used to replace the original ultrasonic transducer 27. The frequencies of the two sets of megasonic transducers are both 940 - 1410 kHz, and the rest are the same. Comparative Example 2

[0082] The difference between this example and Example 2 is only that in this example, two sets of ultrasonic transducers are used, that is, one of the ultrasonic transducers is used to replace the original megasonic transducer. The frequencies of the two sets of ultrasonic transducers are both 20 - 30 kHz, and the rest are the same. Comparative Example 3

[0083] The difference between this example and Example 2 is only that in this example, the honeycomb hole structure is entirely composed of the first round holes 2631, and the rest are the same. Comparative Example 4

[0084] The difference between this example and Example 2 is only that in this example, the honeycomb hole structure is entirely composed of regular hexagon holes 2641, and the rest are the same. Comparative Example 5

[0085] The difference between this example and Example 2 is only that in this example, the honeycomb hole structure is entirely composed of square holes (with the same area as the first round holes 2631), and the rest are the same.

[0086] Characterization test for the service life of the elastic layer

[0087] After the air pressure high - frequency disturbance device has worked for 240 h cumulatively in an environment of 40 °C, the elastic layer is removed, and whether there are cracks or splits at the honeycomb hole structure is observed, and the quantity is counted. The test results of Example 2 and Comparative Examples 1 - 5 are shown in Table 6:

[0088] Table 6

[0089]

[0090] As can be seen from Table 6, the honeycomb hole structure composed of the combination of ultrasonic transducers and megasonic transducers and the combination of round holes and regular hexagon holes can significantly improve the service life of the elastic layer.

[0091] In addition, it should be understood that those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pneumatic pipeline conveyor for furniture board processing, comprising a conveyor barrel (10), a check valve (30) connected to an air source, wherein the check valve (30) is installed at the rear of the conveyor barrel (10); high-pressure gas generated by the air source provides a pneumatic driving force to the inside of the conveyor barrel (10) through the check valve (30), and the air pressure of the high-pressure gas generated by the air source is greater than or equal to 400 kPa, characterized in that: The tail of the conveyor barrel (10) is also equipped with a high-frequency air pressure disturbance device (20) for converting the constant air pressure output by the check valve (30) into a high-frequency fluctuating air pressure, wherein the frequency of the high-frequency fluctuating air pressure is 1-11 Hz, and the pressure value of the high-frequency fluctuating air pressure varies within a range of 25-95 kPa; The air pressure high-frequency disturbance device (20) comprises a tube body (21), wherein two cone shells (22) are arranged inside the tube body (21) and are symmetrically distributed along an axis, wherein the large ends of the two cone shells (22) are arranged adjacent to each other, and the large ends of the two cone shells (22) are both sealedly connected to the inner wall of the tube body (21), and the internal space of the tube body (21) is divided by the two cone shells (22) into a first air inlet chamber (28) located outside the first cone shell (22), a middle chamber located between the two cone shells (22), and a first air outlet chamber (29) located outside the second cone shell (22), wherein the small end of the first cone shell (22) is provided with an air inlet hole (222), and the small end of the second cone shell (22) is provided with an air outlet hole (221); a central portion of the middle chamber is provided with a first air inlet chamber (28) located outside the first cone shell (22), and a central portion of the middle chamber is provided with a second air outlet hole (29). A honeycomb high-frequency vibration component is provided, wherein a sealing glue layer (24) is provided between the edge of the honeycomb high-frequency vibration component and the inner wall of the tube body (21), and the middle chamber is divided into a second air inlet cavity (25) connected to the air inlet hole (222) and a second air outlet cavity (23) connected to the air outlet hole (221) by the honeycomb high-frequency vibration component and the sealing glue layer (24); the honeycomb high-frequency vibration component comprises a honeycomb vibration plate (26), an ultrasonic transducer (27) located on one side of the honeycomb vibration plate (26), and a megasonic transducer located on the other side of the honeycomb vibration plate (26); the first air inlet cavity (28) is connected to the output end of the check valve (30), and the first air outlet cavity (29) is connected to the inner cavity of the conveyor barrel (10); The power of the megasonic transducer is equal to the power of the ultrasonic transducer (27), and the ratio of the frequency of the megasonic transducer to the frequency of the ultrasonic transducer (27) is 47; The frequency of the ultrasonic transducer (27) is 20-30 kHz, and the frequency of the megasonic transducer is 940-1410 kHz.

2. A pneumatic pipe conveyor for furniture board processing according to claim 1, characterized in that: The honeycomb vibration plate (26) comprises two metal pressing plates (261) and an elastic layer (262) located between the two metal pressing plates (261); a side wall of the elastic layer (262) is provided with a honeycomb hole structure for connecting the second air inlet cavity (25) and the second air outlet cavity (23).

3. A pneumatic pipe conveyor for furniture board processing according to claim 2, characterized in that: The honeycomb hole structure comprises a first circular hole group (263) arranged along the length direction of the elastic layer (262), and two double-row hole units, wherein the two double-row hole units are respectively located on both sides of the first circular hole group (263) and are symmetrically arranged; the double-row hole unit comprises two double-row hole groups (264), wherein the first circular hole group (263) is composed of a plurality of first circular holes (2631) arranged along the length direction of the elastic layer (262), and the double-row hole group (264) is composed of a plurality of second circular holes (2642) and regular hexagonal holes (2641) arranged at intervals from the second circular holes (2642), wherein the second circular holes (2642) and the second circular holes (2642) are both arranged along the length direction of the elastic layer (262); and in the double-row hole unit, the second circular holes (2642) in the first double-row hole group (264) and the second circular holes (2642) in the second double-row hole group (264) are arranged in an alternating manner.

4. The pneumatic pipe conveyor for furniture board processing according to claim 3, characterized in that: The area of ​​the first circular hole (2631) is equal to the area of ​​the second circular hole (2642), and the area of ​​the second circular hole (2642) is equal to the area of ​​the regular hexagonal hole (2641).

5. The pneumatic pipe conveyor for furniture board processing according to claim 1, characterized in that: The ratio of the area of ​​the air outlet hole (221) to the area of ​​the air inlet hole (222) is x, and 1.6≤x≤2.

6. The pneumatic pipe conveyor for furniture board processing according to claim 1, characterized in that: It also includes a feeding mechanism for conveying fluid material into the conveyor barrel (10), the feeding mechanism including a hopper (12) and a feeding vertical pipe (11), the upper end of the feeding vertical pipe (11) is connected to the lower end of the hopper (12), and a feeding hole connected to the lower end of the feeding vertical pipe (11) is provided on the upper side of the tail of the conveyor barrel (10).

7. A pneumatic pipe conveyor for furniture board processing according to claim 6, characterized in that: A spiral stirring blade (13) is arranged inside the feed vertical pipe (11), and a stirring shaft (14) is arranged at the center of the spiral stirring blade (13). The upper end of the stirring shaft (14) passes through the hopper (12) and is located above the hopper (12).

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