CN218917140U

CN218917140U - Pulp fiber layer permeability measuring device

Info

Publication number: CN218917140U
Application number: CN202222825267.7U
Authority: CN
Inventors: 陈俊忠; 龚俊; 沈超; 王超; 张红杰; 张文晖; 何广德; 左华伟
Original assignee: Yongfa Henan Moulding Technology Development Co ltd
Current assignee: Yongfa Henan Moulding Technology Development Co ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2023-04-25
Anticipated expiration: 2032-10-26

Abstract

The utility model discloses a pulp fiber layer permeability measuring device which comprises a measuring cylinder body, a liquid storage barrel, a pressure sensor, a distance measuring sensor and a liquid sensor, wherein an air inlet of the measuring cylinder body is connected with a high-pressure air source through an electromagnetic valve, a water inlet of the measuring cylinder body is connected with a diaphragm pump, the other end of the diaphragm pump is connected with a water barrel, the liquid storage barrel is arranged on an electronic balance, signal wires of the pressure sensor, the distance measuring sensor and the liquid sensor are connected with a data acquisition card, a control wire of the electromagnetic valve is connected with the data acquisition card through a first solid relay, a power wire of the diaphragm pump is connected with the data acquisition card through a second solid relay, and the data acquisition card is connected with a computer. The device realizes that the liquid level and the air pressure in the measuring process are basically constant, automatically monitors the flow of the filtrate, can rapidly compress the pulp fiber layer to the required thickness with high precision, has higher automation and accurate measurement.

Description

Pulp fiber layer permeability measuring device

Technical Field

The utility model relates to the technical field of experimental measurement instruments, in particular to a pulp fiber layer permeability measuring device.

Background

Plastic products are widely used in the packaging field due to low cost and excellent packaging performance, but corresponding environmental protection problems are increasingly developed. In recent years, with the continuous implementation of national environmental protection policies and the enhancement of environmental protection consciousness of consumers, pollution-free and nuisanceless green packages are receiving more and more attention and importance. The pulp molding product is a packaging material which is obtained by taking primary fiber or secondary fiber as a main raw material, dehydrating and molding the fiber by a special mold, and drying and shaping. Because of the advantages of renewable raw materials, degradable products and the like, the pulp molding product has become a green packaging material which has the highest potential to replace plastic products in the packaging market.

Pulp molded products are generally prepared by processes such as slurry preparation, molding, drying, shaping, post-processing and the like. At present, the forming process of the pulp molding product mainly adopts vacuum forming, namely, the lower die of the die is immersed into a pulp pool, and fibers in the pulp pool are uniformly adsorbed on the surface of the pulp pool through negative pressure and then are clamped with the upper die. In the vacuum forming process, the pulp sucking forming process of wet pulp fibers in a pulp tank is one of key steps affecting the pulp molding quality. The mathematical model describing the pulp fiber forming process can be established according to the existing filtering theory by adopting computer simulation (emulation) research, and the whole pulp suction forming process is simulated, thereby providing a new way for controlling the wet pulp forming quality. Whereas the permeability of the pulp fibre layer is one of the key parameters of the mathematical model of the filtering theory. Therefore, there is an urgent need for a pulp fiber layer permeability measuring device for rapidly, simply and accurately measuring the permeability of a pulp fiber layer, providing necessary basic experimental data for quality control and computer-aided design in a pulp suction forming process, further deeply recognizing a pulp suction forming mechanism, and realizing accurate control of quality in the pulp suction forming process.

Disclosure of Invention

The utility model provides a device for measuring the permeability of a pulp fiber layer, which is used for measuring the permeability of the pulp fiber layer rapidly, simply, conveniently and accurately.

In order to achieve the above purpose, the utility model is realized by the following technical scheme: the utility model provides a measuring device of pulp fibrous layer permeability, includes measurement barrel, liquid storage bucket, pressure sensor, range finding sensor and liquid sensor, the air inlet of measurement barrel passes through the solenoid valve and links to each other with high-pressure air source, the water inlet of measurement barrel links to each other with the diaphragm pump, the other end of diaphragm pump links to each other with the cask, and the liquid storage bucket sets up on electronic balance, pressure sensor, range finding sensor and liquid sensor's signal line links to each other with data acquisition card, the control line of solenoid valve links to each other with data acquisition card through first solid state relay, the power line of diaphragm pump links to each other with data acquisition card through the solid state relay of second, data acquisition card links to each other with the computer.

Preferably, the measuring cylinder body consists of an upper cover, an upper cylinder body and a lower cylinder body, wherein a screw rod sleeve is arranged on the inner side of the top end of the upper cover, a ranging sensor is fixed on the outer side of the top end of the upper cover, a screw rod of a lifting squeezing part moves up and down along a central hole of the top end of the upper cover, the upper cover is connected with the upper cylinder body through a first flange, an air inlet, a pressure sensor, a water inlet, a liquid level sensor and a slurry adding port are sequentially arranged on the side wall of the upper cylinder body, and the upper cylinder body is connected with the lower cylinder body through a second flange;

the bottom of the lower cylinder body is provided with a hole and is connected with an overflow pipe, and the outlet of the overflow pipe is higher than the top end of the flange of the lower cylinder body and is arranged right above the liquid storage barrel.

Preferably, the inner diameter of the overflow pipe is 10-20mm.

Preferably, the included angle between the slurry adding port and the side wall of the upper cylinder body is 30-45 degrees, the inner diameter of the slurry adding port is more than or equal to 15mm, and the slurry adding port is provided with a sealing cover.

Preferably, a first silica gel pad, a filter screen, a porous support piece and a second silica gel pad are sequentially arranged in the middle of the second flange from top to bottom;

the porous support piece is a pressure-resistant corrosion-resistant rigid porous plate, and the outer diameters of the filter screen and the porous support piece are larger than the inner diameter of the lower cylinder;

the first silica gel pad and the second silica gel pad are of circular ring structures, the outer diameters of the first silica gel pad and the second silica gel pad are larger than that of the filter screen, the outer diameters of the first silica gel pad and the second silica gel pad are smaller than that of the second flange, and the inner diameters of the first silica gel pad and the second silica gel pad are the same as that of the lower cylinder body and are used for flange sealing.

Preferably, the mesh number of the filter screen is 120-300 meshes;

the pore diameter of the porous supporting piece is 2-3mm.

Preferably, the lifting squeezing part comprises a hand wheel, a screw rod sleeve, a screw rod connecting piece, a polish rod and a porous piston, wherein the hand wheel is fixed at one end of the screw rod, a bearing is embedded at the upper end of the screw rod connecting piece and is connected with the other end of the screw rod, the lower end of the screw rod connecting piece is fixedly connected with the polish rod, the lower end of the polish rod is fixed on the porous piston, and a porous net is fixed at the lower end of the porous piston.

Preferably, the porous web is 120-300 mesh.

Preferably, the distance measuring sensor is used for measuring the moving distance of a hand wheel on the lifting press, the position of the porous piston is determined by determining the position of the hand wheel, so that the thickness of the fiber layer is determined, the pressure sensor is used for measuring the air pressure in the cylinder, and the electronic balance is used for recording the overflowed filtrate mass.

Preferably, the data acquisition card controls the on-off of the first solid-state relay according to the signal fed back by the pressure sensor and is used for keeping the air pressure stable in the measurement process, and the data acquisition card controls the on-off of the second solid-state relay according to the signal fed back by the liquid level sensor and further controls the start and stop of the diaphragm pump and is used for keeping the liquid level above the porous piston stable.

Drawings

FIG. 1 is a schematic diagram of the measurement structure of the device of the present utility model;

FIG. 2 is a schematic view of the measuring cylinder structure of the present utility model;

fig. 3 is a schematic view of a second flange-to-flange arrangement according to the present utility model.

In the figure: 1. measuring a cylinder; 2. a liquid storage barrel; 3. an electronic balance; 4. an electromagnetic valve; 5. a high pressure air source; 6. a diaphragm pump; 7. a data acquisition card; 8. a computer; 9. a first solid state relay; 10. a second solid state relay; 11. an upper cover; 12. an upper cylinder; 13. a lower cylinder; 14. an air inlet; 15. a water inlet; 16. a slurry adding port; 17. lifting the press; 18. an overflow pipe; 19. a pressure sensor; 20. a ranging sensor; 21. a first flange; 22. a second flange; 23. a liquid sensor; 171. a hand wheel; 172. a screw rod; 173. a screw rod sleeve; 174. a screw rod connecting piece; 175. a polish rod; 176. a porous piston; 221. a first silicone pad; 222. a filter screen; 223. a porous support; 224. and a second silica gel pad.

Detailed Description

The description herein as relating to "first," "second," etc. is for descriptive purposes only and is not intended to be specifically construed as a sequential or ordinal meaning nor is it intended to be limiting, but is merely intended to distinguish between components or operations that are described in the same technical term and is not to be interpreted as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the embodiments may be combined with each other, but it is necessary to base that a person skilled in the art can implement the combination of technical solutions, when the combination of technical solutions contradicts or cannot be implemented, should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present utility model.

Examples

Referring to fig. 1-2, an embodiment of the present utility model is provided: the device for measuring the permeability of the pulp fiber layer comprises a measuring cylinder body 1, a liquid storage barrel 2, an electronic balance 3, an electromagnetic valve 4, a high-pressure air source 5, a diaphragm pump 6, a data acquisition card 7, a computer 8, a first solid-state relay 9 and a second solid-state relay 10; the air inlet 14 of the measuring cylinder 1 is connected with the high-pressure air source 5 through the electromagnetic valve 4, the water inlet 15 of the measuring cylinder 1 is connected with the diaphragm pump 6, the other end of the diaphragm pump 6 is connected with the water bucket, the liquid storage bucket 2 is placed on the electronic balance 3, the signal wires of the pressure sensor 19, the ranging sensor 20 and the liquid sensor 23 are connected with the data acquisition card 7, the control wire of the electromagnetic valve 4 is connected with the data acquisition card 7 through the first solid state relay 9, the power wire of the diaphragm pump 6 is connected with the data acquisition card 7 through the second solid state relay 10, and the data acquisition card 7 is connected with the computer 8.

The measuring cylinder 1 consists of an upper cover 11, an upper cylinder 12 and a lower cylinder 13, wherein a screw rod sleeve 173 is arranged on the inner side of the top end of the upper cover 11, a ranging sensor 20 is fixed on the outer side of the top end of the upper cover 11, a screw rod 172 of a lifting press piece 17 moves up and down along a central hole of the top end of the upper cover 11, the upper cover 11 is connected with the upper cylinder 12 through a first flange 21, an air inlet 14, a pressure sensor 19, a water inlet 15, a liquid level sensor and a slurry adding port 16 are sequentially arranged on the side wall of the upper cylinder 12, the upper cylinder 12 is connected with the lower cylinder 13 through a second flange 22, a hole is formed in the bottom of the lower cylinder 13 and is connected with an overflow pipe 18, the outlet of the overflow pipe 18 is higher than the top end of the flange of the lower cylinder 13 and is arranged right above the liquid storage barrel 2, and the inner diameter of the overflow pipe 18 is 15mm.

The included angle between the slurry adding port 16 and the side wall of the upper cylinder 12 is 30-45 degrees, the inner diameter of the slurry adding port 16 is 25mm, and the slurry adding port 16 is provided with a sealing cover.

A first silica gel pad 221, a filter screen 222, a porous support 223 and a second silica gel pad 224 are sequentially arranged in the middle of the second flange 22 from top to bottom; the mesh number of the filter screen 222 is 150 meshes, the porous support 223 is a pressure-resistant corrosion-resistant rigid porous plate, the aperture is 2.5mm, and the outer diameters of the filter screen 222 and the porous support 223 are larger than the inner diameter of the lower cylinder 13; the first silica gel pad 221 and the second silica gel pad 224 are both of a circular ring structure, the outer diameter of which is larger than that of the filter screen 222, and the diameter of which is slightly smaller than that of the second flange 22, and the inner diameter of which is the same as that of the lower cylinder 13, for flange sealing.

The lifting squeezing piece 17 is composed of a hand wheel 171, a screw rod 172, a screw rod sleeve 173, a screw rod connecting piece 174, a polish rod 175 and a porous piston 176, wherein the hand wheel 171 is fixed at one end of the screw rod 172, a bearing is embedded at the upper end of the screw rod connecting piece 174 and is connected with the other end of the screw rod 172, the lower end of the screw rod connecting piece 174 is fixedly connected with the polish rod 175, the lower end of the polish rod 175 is fixed on the porous piston 176, a porous net is fixed at the lower end of the porous piston 176, and 120-300 meshes are adopted for the porous net.

The distance measuring sensor 20 is used for measuring the moving distance of the hand wheel 171 on the lifting press 17, the position of the porous piston 176 is determined by determining the position of the hand wheel 171, so as to determine the thickness of the fiber layer, the pressure sensor 19 is used for measuring the air pressure in the cylinder 1, and the electronic balance 3 is used for recording the overflowed filtrate mass.

The data acquisition card 7 controls the on-off of the first solid-state relay 9 according to the signal fed back by the pressure sensor 19 and is used for keeping the air pressure stable in the measurement process, and the data acquisition card 7 controls the on-off of the second solid-state relay 10 according to the signal fed back by the liquid level sensor and further controls the start and stop of the diaphragm pump 6 and is used for keeping the liquid level on the porous piston 176 stable.

The working principle of the scheme has the beneficial effects that: adding the needed pulp fibers into the pulp adding port 16, standing, closing the sealing cover of the pulp adding port 16 after obvious layering of pulp fiber suspension occurs, running a software program in a computer 8, setting air pressure and monitoring the position of the porous piston 176, and rotating the lifting press member 17 to the needed position according to the position information of the porous piston 176, namely compressing the pulp fiber layer to the designated thickness. After the air pressure and the upper liquid level of the pulp fiber layer are kept basically stable and the liquid flow flowing out of the overflow pipe 18 is kept stable, the overflow flow rate, namely the filtrate mass in unit time, is recorded through the electronic balance 3, and the permeability of certain pulp fiber concentration to the pulp fiber layer is obtained according to Darcy's law based on the data of the filtration pressure, the thickness of the pulp fiber layer, the overflow flow rate, the liquid viscosity and the filtration area.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A pulp fiber layer permeability measuring device is characterized in that,

including measuring barrel (1), liquid storage bucket (2), pressure sensor (19), range finding sensor (20) and liquid sensor (23), air inlet (14) of measuring barrel (1) link to each other with high pressure air supply (5) through solenoid valve (4), water inlet (15) of measuring barrel (1) link to each other with diaphragm pump (6), the other end of diaphragm pump (6) links to each other with the cask, liquid storage bucket (2) set up on electronic balance (3), the signal line of pressure sensor (19), range finding sensor (20) and liquid sensor (23) links to each other with data acquisition card (7), the control line of solenoid valve (4) links to each other with data acquisition card (7) through first solid state relay (9), the power line of diaphragm pump (6) links to each other with data acquisition card (7) through second solid state relay (10), data acquisition card (7) link to each other with computer (8).

2. A pulp fiber layer permeability measuring apparatus according to claim 1, wherein,

the measuring cylinder body (1) consists of an upper cover (11), an upper cylinder body (12) and a lower cylinder body (13), a screw rod sleeve (173) is arranged on the inner side of the top end of the upper cover (11), a ranging sensor (20) is fixed on the outer side of the top end of the upper cover (11), a screw rod (172) of a lifting press piece (17) moves up and down along a top end center hole of the upper cover (11), the upper cover (11) is connected with the upper cylinder body (12) through a first flange (21), an air inlet (14), a pressure sensor (19), a water inlet (15), a liquid level sensor and a slurry adding port (16) are sequentially arranged on the side wall of the upper cylinder body (12), and the upper cylinder body (12) is connected with the lower cylinder body (13) through a second flange (22);

the bottom of the lower cylinder body (13) is provided with a hole and is connected with an overflow pipe (18), and the outlet of the overflow pipe (18) is higher than the top end of a flange of the lower cylinder body (13) and is arranged right above the liquid storage barrel (2).

3. A pulp fiber layer permeability measuring apparatus according to claim 2, wherein,

the inner diameter of the overflow pipe (18) is 10-20mm.

4. A pulp fiber layer permeability measuring apparatus according to claim 2, wherein,

the included angle between the slurry adding port (16) and the side wall of the upper cylinder body (12) is 30-45 degrees, the inner diameter of the slurry adding port (16) is more than or equal to 15mm, and the slurry adding port (16) is provided with a sealing cover.

5. A pulp fiber layer permeability measuring apparatus according to claim 2, wherein,

a first silica gel pad (221), a filter screen (222), a porous support (223) and a second silica gel pad (224) are sequentially arranged in the middle of the second flange (22) from top to bottom;

the porous support (223) is a pressure-resistant corrosion-resistant rigid porous plate, and the outer diameters of the filter screen (222) and the porous support (223) are larger than the inner diameter of the lower cylinder (13);

the first silica gel pad (221) and the second silica gel pad (224) are of circular ring structures, the outer diameters of the first silica gel pad (221) and the second silica gel pad (224) are larger than the filter screen (222), the outer diameters of the first silica gel pad (221) and the second silica gel pad (224) are smaller than the diameter of the second flange (22), and the inner diameters of the first silica gel pad (221) and the second silica gel pad (224) are the same as the inner diameter of the lower cylinder (13) and are used for flange sealing.

6. A pulp fiber layer permeability measuring apparatus according to claim 5, wherein,

the mesh number of the filter screen (222) is 120-300 meshes;

the pore diameter of the porous support (223) is 2-3mm.

7. A pulp fiber layer permeability measuring apparatus according to claim 2, wherein,

lifting press piece (17) comprises hand wheel (171), lead screw (172), lead screw cover (173), lead screw connecting piece (174), polished rod (175) and porous piston (176), the one end at lead screw (172) is fixed to hand wheel (171), the other end of lead screw (172) is connected to embedded bearing in lead screw connecting piece (174) upper end, polished rod (175) is connected fixedly to lead screw connecting piece (174) lower extreme, the lower extreme of polished rod (175) is fixed on porous piston (176), the lower extreme of porous piston (176) is fixed with the porous net.

8. A pulp fiber layer permeability measuring apparatus according to claim 7,

the porous net adopts 120-300 meshes.

9. A pulp fiber layer permeability measuring apparatus according to claim 7,

the distance measuring sensor (20) is used for measuring the moving distance of a hand wheel (171) on the lifting press (17), the position of the porous piston (176) is determined by determining the position of the hand wheel (171), so that the thickness of a fiber layer is determined, the pressure sensor (19) is used for measuring the air pressure in the cylinder (1), and the electronic balance (3) is used for recording the overflowed filtrate mass.

10. A pulp fiber layer permeability measuring apparatus according to claim 7,

the data acquisition card (7) is used for controlling the on-off of the first solid-state relay (9) according to signals fed back by the pressure sensor (19) and keeping air pressure stable in the measurement process, and the data acquisition card (7) is used for controlling the on-off of the second solid-state relay (10) according to signals fed back by the liquid level sensor and further controlling the start and stop of the diaphragm pump (6) and keeping the liquid level on the porous piston (176) stable.