Vacuum dehydration device for urea resin

Abstract

The utility model discloses a vacuum dehydration device for urea-formaldehyde resin, and belongs to the field of urea-formaldehyde resin production. A vacuum dehydration device for urea resin comprises a working barrel with a negative pressure assembly, a sieve plate is fixedly connected in the working barrel, sieve holes are formed in the sieve plate, a cleaning plate is connected in the working barrel in a lifting mode, cleaning columns corresponding to the sieve holes are fixedly connected to the bottom of the cleaning plate, and air bags are arranged on the outer walls of the cleaning columns. The outer wall of the air bag can abut against the inner wall of the screen hole. According to the cleaning device, blocking objects in the sieve holes can be cleaned in the descending process of the cleaning columns, the air bags on the cleaning columns can be inflated and expanded, then the outer portions of the air bags abut against the inner walls of the sieve holes and can be attached to the inner walls of the sieve holes, urea resin blocked in the sieve holes can be repeatedly dredged, and the cleaning effect is good. The filtering effect of a subsequent sieve plate is improved, and the vacuum dehydration efficiency of urea resin is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of urea-formaldehyde resin production, in particular to a vacuum dehydration device for urea-formaldehyde resin. Background Art

[0002] Urea-formaldehyde resin is the initial urea-formaldehyde resin formed by condensation of urea and formaldehyde under the action of a catalyst, and then forms a final thermosetting resin under the action of a curing agent or an auxiliary agent. It is the most widely used variety of adhesives, especially in the manufacture of various artificial boards in the wood processing industry, urea-formaldehyde resin and its modified products account for about 90% of the total amount of adhesives. Urea-formaldehyde resin has the advantages of abundant and easy-to-obtain raw materials, low production cost, fast curing, and high bonding strength. It is widely used in artificial board industries such as plywood, particleboard, and fiberboard. At present, it is necessary to use negative pressure components, such as negative pressure pumps or vacuum pumps, to remove part or most of the water in the reaction solution of urea-formaldehyde resin at a certain stage of the reaction.

[0003] After searching, it is found that the prior art publication number CN207253782U proposes a vacuum dehydration device for resin, which includes a dehydration tank, a condenser is connected to the top of the dehydration tank through a pipeline, the condenser is connected to a collector, the collector is connected to a vacuum machine, a circulation pipeline is provided outside the dehydration tank, one end of the circulation pipeline is connected to the bottom of the dehydration tank, and the other end of the circulation pipeline is connected to the top of the dehydration tank, a circulation pump is provided on the circulation pipeline, a distributor is provided inside the dehydration tank, and a temperature control screen is provided inside the dehydration tank.

[0004] However, the urea-formaldehyde resin reaction solution is a highly viscous liquid. After being used for a period of time, the urea-formaldehyde resin tends to adhere to the inside of the sieve holes of the temperature control screen and block the sieve holes, thereby reducing the filtering effect of the temperature control screen and the dehydration efficiency of the urea-formaldehyde resin. Utility Model Content

[0005] The utility model aims to solve the problem in the prior art that urea-formaldehyde resin is easily adhered to the inside of the sieve holes of the temperature control screen and blocks the sieve holes, thereby reducing the filtering effect of the temperature control screen and reducing the dehydration efficiency of the urea-formaldehyde resin, and proposes a vacuum dehydration device for urea-formaldehyde resin.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A vacuum dehydration device for urea-formaldehyde resin comprises a working cylinder with a negative pressure component, a sieve plate fixedly connected inside the working cylinder, sieve holes are formed on the sieve plate, a cleaning plate is lifted and connected inside the working cylinder, a cleaning column corresponding to the sieve holes is fixedly connected to the bottom of the cleaning plate, an air bag is arranged on the outer wall of the cleaning column, and when the cleaning column moves toward the sieve plate, the outer wall of the air bag can be against the inner wall of the sieve hole.

[0008] In order to facilitate the storage or expansion of the airbag, preferably, a groove is provided on the cleaning column, the airbag is arranged in the groove, and a first channel is provided in the cleaning column, and the first channel is connected to the airbag.

[0009] In order to facilitate the air supply to the airbag, further, a boosting cylinder is fixedly connected to the cleaning plate, a boosting rod is slidably connected to the boosting cylinder, one end of the boosting rod is fixedly connected to a piston, the other end of the boosting rod is fixedly connected to the inner wall of the working cylinder, and the cavity above the piston is connected to the first channel through a connecting pipe.

[0010] In order to facilitate the purging of the outside of the airbag, further, a jet hole is opened on the cleaning column, the jet end of the jet hole faces the airbag, and an annular channel is opened in the cleaning column, the annular channel is arranged above the airbag, and the jet hole is connected to the annular channel.

[0011] In order to facilitate the air supply to the air injection hole, preferably, a second channel connected to the annular channel is opened in the cleaning column, and the cavity below the piston is connected to the second channel through an air outlet pipe.

[0012] In order to facilitate the lifting and lowering movement of the screen plate, preferably, an electric telescopic rod is fixedly connected to the working cylinder, and the cleaning plate is fixedly connected to the output end of the electric telescopic rod through a connecting rod.

[0013] Compared with the prior art, the utility model provides a vacuum dehydration device for urea-formaldehyde resin, which has the following beneficial effects:

[0014] 1. The vacuum dehydration device for urea-formaldehyde resin can clean the blockage in the sieve hole through the cleaning column during the descending process, and the air bag on the cleaning column will be inflated, so that the outside of the air bag will be against the inner wall of the sieve hole, and can also fit on the inner wall of the sieve hole, so as to repeatedly clear the urea-formaldehyde resin blocked in the sieve hole, improve the filtering effect of the subsequent sieve plate, and improve the vacuum dehydration efficiency of urea-formaldehyde resin;

[0015] 2. The urea-formaldehyde resin vacuum dehydration device sprays air toward the airbag through the air jet hole to purge solid impurities on the outer wall of the airbag, thereby reducing the amount of impurities outside the airbag and improving subsequent cleaning effects.

[0016] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The utility model can enable the cleaning column to clean the blockage in the sieve hole during the descent process, and the air bag on the cleaning column will be inflated, so that the outside of the air bag will be against the inner wall of the sieve hole, and can also fit on the inner wall of the sieve hole, thereby repeatedly clearing the urea-formaldehyde resin blocked in the sieve hole, improving the filtering effect of the subsequent sieve plate, and improving the vacuum dehydration efficiency of the urea-formaldehyde resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of a workbench of a vacuum dehydration device for urea-formaldehyde resin proposed in the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of a sieve plate of a vacuum dehydration device for urea-formaldehyde resin proposed in the utility model;

[0019] Figure 3 This is a schematic diagram of the structure inside the booster cylinder of a vacuum dehydration device for urea-formaldehyde resin proposed by the utility model;

[0020] Figure 4 It is a schematic diagram of a cross-section of a cleaning plate of a vacuum dehydration device for urea-formaldehyde resin proposed by the utility model;

[0021] Figure 5 The utility model is a partial structural schematic diagram of a vacuum dehydration device for urea-formaldehyde resin.

[0022] In the figure: 1, working cylinder; 101, electric telescopic rod; 2, sieve plate; 201, sieve hole; 3, cleaning plate; 4, cleaning column; 401, annular channel; 402, jet hole; 5, air bag; 6, booster cylinder; 601, booster rod; 602, piston; 603, connecting pipe. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] Example:

[0026] Reference Figure 1-Figure 5A vacuum dehydration device for urea-formaldehyde resin comprises a working cylinder 1 with a negative pressure component, a sieve plate 2 is fixedly connected in the working cylinder 1, and a sieve hole 201 is opened on the sieve plate 2, and the negative pressure component can be a negative pressure pump or a vacuum machine, and the production raw materials of urea-formaldehyde resin are mainly 300 parts of formaldehyde, 165 parts of urea, 105 parts of melamine, 12.5 parts of polyvinyl alcohol, and 30 parts of ammonia water. Formaldehyde can be added once, melamine can be added twice, and urea can be added four times, and react in weak alkaline, weak acidic, and weak alkaline media in turn; polyvinyl alcohol and ammonia water are added to the formaldehyde solution, and the pH value of the solution is adjusted to 8.0-8.5; the first batch of melamine and the first batch of urea are added to the solution in the previous step, the temperature of the solution is raised to 85-90°C, the heat preservation time is 40 minutes, and then the pH value of the solution is adjusted to 6.8-7.5; formic acid is added to the solution in the previous step, and the pH value of the solution is adjusted to 4. 8~5.6, control the temperature to 90~98℃, react until the viscosity of the coating-4 cup is measured by thermal measurement for 13~15 seconds; adjust the pH value of the solution in the previous step to 9.0~9.5, then add the second batch of urea and the second batch of melamine, control the temperature to 90~95℃, react until the viscosity of the coating-4 cup is measured by thermal measurement for 14~15 seconds; adjust the pH value of the solution in the previous step to 8.0~9.0, add the third batch of urea, keep the temperature at 85~90℃, and keep warm for 15~25 minutes; cool the temperature of the solution in the previous step to 75~60℃, add the fourth batch of urea, and then cool the temperature of the solution to 40~45℃, adjust the pH value of the solution to 8.5~9.0 and then discharge the material, so as to realize the production of urea-formaldehyde resin, but the production of urea-formaldehyde resin requires the removal of part or most of the water in the reaction solution at a certain stage of the reaction, so it is necessary to intercept the urea-formaldehyde resin through the sieve plate 2.

[0027] Please refer to Figure 2-Figure 5 An electric telescopic rod 101 is fixedly connected to the working cylinder 1, and the cleaning plate 3 is fixedly connected to the output end of the electric telescopic rod 101 through a connecting rod. The model of the electric telescopic rod 101 can be YMD-501, which is used to adjust the position of the cleaning plate 3, and a cleaning column 4 corresponding to the sieve hole 201 is also fixedly connected to the bottom of the cleaning plate 3.

[0028] A groove is also provided on the outer wall of the cleaning column 4, and an airbag 5 is fixedly connected in the groove. A first channel is provided in the cleaning column 4, and the first channel is connected to the airbag 5. A booster cylinder 6 is fixedly connected to the cleaning plate 3, and a booster rod 601 is slidably connected to the booster cylinder 6. One end of the booster rod 601 is fixedly connected to a piston 602, and the other end of the booster rod 601 is fixedly connected to the inner wall of the working cylinder 1. At this time, the booster rod 601 and the working cylinder 1 remain stationary, and the cavity above the piston 602 is connected to the first channel through the connecting tube 603. The airbag 5 is inflated by supplying air to the first channel.

[0029] Here, when it is necessary to clean the sieve holes 201 on the sieve plate 2, start the switch of the electric telescopic rod 101 to drive the cleaning plate 3 to move toward the position of the sieve plate 2. At this time, the booster rod 601 remains stationary, and the air in the cavity above the piston 602 will be transported to the airbag 5 through the connecting pipe 603, causing the airbag 5 to expand in the groove. The cleaning column 4 will clean the blockage in the sieve hole 201 during the descent process, and the airbag 5 on the cleaning column 4 will be inflated, so that the outer wall of the airbag 5 will be against the inner wall of the sieve hole 201, and it can also fit on the inner wall of the sieve hole 201, thereby repeatedly clearing the urea-formaldehyde resin blocked in the sieve hole 201, thereby improving the subsequent filtering effect of the sieve plate 2 and the vacuum dehydration efficiency of the urea-formaldehyde resin.

[0030] In addition, an injection hole 402 is provided on the cleaning column 4, and the injection end of the injection hole 402 faces the airbag 5, and an annular channel 401 is provided in the cleaning column 4, and the annular channel 401 is arranged above the airbag 5, and the injection hole 402 is connected with the annular channel 401, and a second channel connected with the annular channel 401 is provided in the cleaning column 4, and the cavity below the piston 602 is connected with the second channel through the outlet pipe, and an air inlet pipe is fixedly connected to the booster cylinder 6, and a one-way valve is provided on the air inlet pipe and the air outlet pipe.

[0031] While supplying air to the airbag 5, the cavity below the piston 602 will automatically be replenished with air through the air intake pipe. When the sieve plate 2 is reset, the boost cylinder 6 moves upward with the sieve plate 2. Due to the negative pressure of the atmosphere, the gas in the airbag 5 will be transported to the cavity above the piston 602 through the connecting pipe 603. At this time, the airbag 5 retracts into the groove. At the same time, the air in the cavity below the piston 602 will enter the second channel through the air outlet pipe, and then the gas will be transported to the annular channel 401. At this time, the jet end of the jet hole 402 sprays toward the airbag 5 to purge the solid impurities on the outer wall of the airbag 5, thereby reducing the amount of impurities outside the airbag 5 and improving the subsequent cleaning effect.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A vacuum dehydration device for urea-formaldehyde resin, comprising a working cylinder (1) with a negative pressure assembly, a sieve plate (2) fixedly connected to the working cylinder (1), and a sieve hole (201) formed on the sieve plate (2), characterized in that: A cleaning plate (3) is connected to the working cylinder (1) in a lifting manner. A cleaning column (4) corresponding to the sieve hole (201) is fixedly connected to the bottom of the cleaning plate (3). An air bag (5) is arranged on the outer wall of the cleaning column (4). When the cleaning column (4) moves toward the sieve plate (2), the outer wall of the air bag (5) can abut against the inner wall of the sieve hole (201).

2. A vacuum dehydration device for urea-formaldehyde resin according to claim 1, characterized in that: The cleaning column (4) is provided with a groove, the airbag (5) is arranged in the groove, and a first channel is provided in the cleaning column (4), the first channel being in communication with the airbag (5).

3. A vacuum dehydration device for urea-formaldehyde resin according to claim 2, characterized in that: The cleaning plate (3) is fixedly connected to a boost cylinder (6), and a boost rod (601) is slidably connected to the boost cylinder (6). One end of the boost rod (601) is fixedly connected to a piston (602), and the other end of the boost rod (601) is fixedly connected to the inner wall of the working cylinder (1). The cavity above the piston (602) is connected to the first channel via a connecting pipe (603).

4. A vacuum dehydration device for urea-formaldehyde resin according to claim 3, characterized in that: The cleaning column (4) is provided with an air jet hole (402), the air jet end of the air jet hole (402) faces the air bag (5), and an annular channel (401) is provided in the cleaning column (4), the annular channel (401) is arranged above the air bag (5), and the air jet hole (402) is connected to the annular channel (401).

5. A vacuum dehydration device for urea-formaldehyde resin according to claim 4, characterized in that: A second channel connected to the annular channel (401) is provided in the cleaning column (4), and the cavity below the piston (602) is connected to the second channel via an air outlet pipe.

6. A vacuum dehydration device for urea-formaldehyde resin according to claim 1, characterized in that: The working cylinder (1) is fixedly connected to an electric telescopic rod (101), and the cleaning plate (3) is fixedly connected to the output end of the electric telescopic rod (101) via a connecting rod.

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