Feeding device for urea resin production

Abstract

A feeding device for urea resin production comprises a storage assembly used for storing sufficient powder raw materials and discharging the powder raw materials according to the preset weight fraction standard; the weighing assembly is used for receiving the powder raw materials discharged from the storage assembly and weighing the powder raw materials, an electric signal is sent after a preset weight fraction is reached, and the storage assembly stops discharging the powder raw materials; and the material conveying assembly is used for conveying the weighed powder raw materials from the material weighing assembly into the reaction pot, the structure is simple, use is convenient, the automation degree of feeding is improved, and the working efficiency is greatly improved on the basis that the number of workers is not increased.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical preparation, and more specifically to a feeding device for urea resin production. Background Art

[0002] Urea resin, also known as urea-formaldehyde resin (UF), is formed by the polycondensation of urea and formaldehyde over a catalyst (alkaline or acidic) to form an initial urea-formaldehyde resin. This resin then forms an insoluble, infusible final thermosetting resin under the action of a curing agent or additive. Cured urea-formaldehyde resin is lighter in color than phenol-formaldehyde resin and is translucent. It is resistant to weak acids and bases, exhibits excellent insulation properties, and exhibits exceptional wear resistance. It is also inexpensive and is the most widely used adhesive. Urea-formaldehyde resin and its modified products account for approximately 90% of total adhesive usage, particularly in the manufacture of various artificial boards in the wood processing industry.

[0003] The general production process is to add 400 kg of environmentally friendly formaldehyde and 600 kg of ordinary formaldehyde into the reactor, start the stirrer, add 2 to 4 kg of polyvinyl alcohol (2099 or 2299 model), add 300 kg of urea, start heating, and after the insulation reaction is completed, use ammonium chloride to adjust the pH value. After gelation, cool to 45°C, stop stirring, and then discharge the material.

[0004] This process is simple to make, easy to operate and easy to master, but it also has certain disadvantages. For example, in the preparation stage, formaldehyde is generally added first, and the formaldehyde is pumped into the metering tank with a pump, and then sent to the reaction pot after metering. If there is no metering tank, the formaldehyde can be weighed and then pumped into the reaction pot with a vacuum pump. Urea is generally weighed with a scale. The amount of formaldehyde and urea used is relatively large. Manual weighing is time-consuming and physically demanding, and the degree of automation is not high, which slows down production efficiency. Summary of the Invention

[0005] One advantage of the utility model is that it provides a feeding device for urea resin production, which has a simple structure and is easy to use, improves the degree of automation of feeding, and greatly improves work efficiency without increasing the number of workers.

[0006] One advantage of the present invention is that it provides a feeding device for urea resin production, which can quickly and accurately provide sufficient amounts of urea and formaldehyde by arranging a primary discharge pipe and a secondary discharge pipe.

[0007] In order to achieve at least one of the above advantages of the present invention, the present invention provides a feeding device for urea resin production, comprising

[0008] A material storage assembly, which is used to store sufficient amounts of powdered raw materials and discharge the powdered raw materials according to a preset weight fraction standard;

[0009] a weighing assembly, which is used to receive and weigh the powdered raw materials discharged from the storage assembly, and send an electrical signal when a preset weight fraction is reached, and the storage assembly stops discharging the powdered raw materials;

[0010] The material transfer assembly is used to transfer the weighed powder raw materials from the material weighing assembly to the reaction pot.

[0011] According to one embodiment of the present invention, the storage assembly, the weighing assembly and the transfer assembly are connected end to end to form a feeding device. There are three groups of feeding devices, which are used for feeding environmentally friendly formaldehyde, ordinary formaldehyde and urea respectively.

[0012] According to an embodiment of the present invention, the material storage assembly includes a material storage tank, a material storage bracket is connected to the side of the material storage tank, and the material storage bracket is connected to a plurality of columns for supporting the material storage bracket;

[0013] The lower end of the storage tank is provided with a discharge portion.

[0014] According to one embodiment of the present invention, the discharge part includes a primary discharge pipe and a secondary discharge pipe. The primary discharge pipe is provided with a primary valve, and the secondary discharge pipe is provided with a secondary valve. The inner diameter of the primary discharge pipe is larger than the inner diameter of the secondary discharge pipe.

[0015] According to one embodiment of the present invention, the weighing assembly includes a weighing tank, the upper portion of which is provided with a feed port corresponding to the outlets of the primary discharge pipe and the secondary discharge pipe, and the powdered raw material discharged from the storage tank falls directly into the weighing tank from the feed port;

[0016] A weighing bracket is connected to the side of the weighing tank, a floor scale is provided below the weighing bracket and connected to the weighing bracket, the floor scale is electrically connected to a control board, and the control board is electrically connected to the first-level valve and the second-level valve;

[0017] The lower end of the weighing tank is provided with a discharge port, a discharge valve is provided at the discharge port, and the discharge valve is connected with a soft connecting pipe.

[0018] According to one embodiment of the present invention, the material transfer assembly includes an inclined material transfer tube, a screw rod is provided in the material transfer tube, the lower end of the screw rod is connected to the lower end of the material transfer tube through a bearing, and the lower end of the screw rod is transmitted from the material transfer tube and connected to a driven wheel;

[0019] An auxiliary rod is connected between adjacent columns, a mounting frame is provided on the auxiliary rod, a motor is provided on the mounting frame, a driving wheel is provided on the output shaft of the motor, a transmission belt is connected to the driving wheel and connected to the driven wheel through the transmission belt;

[0020] An opening is provided above the lower end of the material transfer pipe and is connected to the other end of the soft connecting pipe.

[0021] According to one embodiment of the present invention, the material transfer assembly further includes a support portion, which includes a plurality of ring buckles arranged on the material transfer tube and a support rod fixedly connected to the ring buckles, and the lower end of the support rod is fixedly set on the ground.

[0022] According to one embodiment of the present invention, a discharge pipe is provided below the upper end of the material transfer pipe.

[0023] According to an embodiment of the present invention, the motor is electrically connected to the control board. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the utility model;

[0025] In the attached figure: 1. Storage tank, 2. Storage bracket, 3. Column, 4. Secondary discharge pipe, 5. Secondary valve, 6. Weighing tank, 7. Weighing bracket, 8. Flexible connecting pipe, 9. Mounting frame, 10. Motor, 11. Auxiliary rod, 12. Floor scale, 13. First-level discharge pipe, 14. First-level valve, 15. Transfer pipe, 16. Ring buckle, 17. Support rod, 18. Discharge pipe, 19. Reactor. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be combined with the appendix of the present invention. Figure 1 , the utility model is described in more detail.

[0027] The following description is intended to disclose the present invention and enable those skilled in the art to implement the present invention. The preferred embodiments described below are provided for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention as defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0028] Those skilled in the art should understand that, in the disclosure of the specification, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] The present invention provides a feeding device for urea resin production, comprising a storage assembly, which is used to store a sufficient amount of powder raw materials and discharge the powder raw materials according to a preset weight fraction standard; a weighing assembly, which is used to receive the powder raw materials discharged from the storage assembly and weigh them, and send an electrical signal after reaching the preset weight fraction, and the storage assembly stops discharging the powder raw materials; a conveying assembly, which is used to convey the weighed powder raw materials from the weighing assembly to the reaction pot 19; the storage assembly, the weighing assembly and the conveying assembly are connected end to end to form a group of feeding devices, and the feeding devices are provided with three groups respectively for environmentally friendly formaldehyde, ordinary formaldehyde and urea feeding operation; the storage assembly includes a storage tank 1, the side of the storage tank 1 is connected to a storage bracket 2, the storage bracket 2 is connected to a number of columns 3 for supporting the storage bracket 2; the lower end of the storage tank 1 is provided with a discharge part; the discharge part includes a primary discharge pipe 13 and a secondary discharge pipe 4, the primary discharge pipe 13 is provided with a primary valve 14, and the secondary discharge pipe 4 is provided with a secondary valve 5; the inner diameter of the primary discharge pipe 13 is larger than the inner diameter of the secondary discharge pipe 4; the weighing assembly includes a weighing tank 6, the upper part of the weighing tank 6 is provided with a feed port corresponding to the outlet of the primary discharge pipe 13 and the secondary discharge pipe 4, and the The powder raw material falls directly into the weighing tank 6 from the feed port; a weighing bracket 7 is connected to the side of the weighing tank 6, a floor scale 12 is provided below the weighing bracket 7 and is connected to the weighing bracket 7, the floor scale 12 is electrically connected to a control panel, and the control panel is electrically connected to the primary valve 14 and the secondary valve 5; a discharge port is provided at the lower end of the weighing tank 6, a discharge valve is provided at the discharge port, and the discharge valve is connected to a flexible connecting pipe 8; the material transfer assembly includes an inclined material transfer pipe 15, a screw rod is provided in the material transfer pipe 15, the lower end of the screw rod is connected to the lower end of the material transfer pipe 15 through a bearing, the lower end of the screw rod is transmitted from the material transfer pipe 15 and is connected to a driven wheel; the adjacent An auxiliary rod 11 is connected between the columns 3, and a mounting bracket 9 is provided on the auxiliary rod 11, and a motor 10 is provided on the mounting bracket 9. The output shaft of the motor 10 is provided with a driving wheel, and the driving wheel is connected to a transmission belt and is connected to the driven wheel through the transmission belt; an opening is provided above the lower end of the material transfer pipe 15 and is connected to the other end of the flexible connecting pipe 8; the material transfer assembly also includes a support part, which includes a plurality of ring buckles 16 provided on the material transfer pipe 15 and a support rod 17 fixedly connected to the ring buckle 16, and the lower end of the support rod 17 is fixedly provided on the ground; a discharge pipe 18 is provided below the upper end of the material transfer pipe 15; the motor 10 is electrically connected to the control board.

[0031] The first embodiment of the present utility model is as follows:

[0032] A feeding device for urea resin production includes a storage assembly for storing a sufficient amount of powdered raw materials and discharging the powdered raw materials according to a preset weight fraction standard;

[0033] a weighing assembly, which is used to receive and weigh the powdered raw materials discharged from the storage assembly, and send an electrical signal when a preset weight fraction is reached, and the storage assembly stops discharging the powdered raw materials;

[0034] The material transfer assembly is used to transfer the weighed powder raw materials from the material weighing assembly to the reaction pot 19.

[0035] The storage assembly, weighing assembly and transfer assembly are connected end to end to form a feeding device. There are three groups of feeding devices, which are used for feeding environmentally friendly formaldehyde, ordinary formaldehyde and urea respectively. According to the preparation process, one production requires 400 kg of environmentally friendly formaldehyde, 600 kg of ordinary formaldehyde and 300 kg of urea. Due to the large amount, they are fed separately through three groups of feeding devices. In addition, the required amount of polyvinyl alcohol, ammonium chloride and sodium hydroxide is relatively small, and it is more convenient to adjust by manual addition.

[0036] The material storage assembly includes a material storage tank 1, which adopts a cylindrical tank body. An opening is provided at the top of the material storage tank 1, and a sufficient amount of formaldehyde or urea can be stored therein to meet the needs of multiple production. The side of the material storage tank 1 is connected to a material storage bracket 2, and the material storage bracket 2 is connected to four columns 3 for supporting the material storage bracket 2. The columns 3 play a supporting and protective role, and are also one of the installation structures of the material transfer assembly.

[0037] A discharge portion is provided at the lower end of the storage tank 1, and the discharge portion includes a first-level discharge pipe 13 and a second-level discharge pipe 4. A first-level valve 14 is provided on the first-level discharge pipe 13, and a second-level valve 5 is provided on the second-level discharge pipe 4; the inner diameter of the first-level discharge pipe 13 is larger than the inner diameter of the second-level discharge pipe 4. In this embodiment, the discharge volume per second of the first-level discharge pipe 13 is 8 times that of the second-level discharge pipe 4, and the opening and closing of the first-level discharge pipe 13 and the second-level discharge pipe 4 are controlled by the first-level valve 14 and the second-level valve 5.

[0038] The weighing assembly includes a weighing tank 6, and the upper part of the weighing tank 6 is provided with a feed port corresponding to the outlet of the first-level discharge pipe 13 and the second-level discharge pipe 4. The powder raw material discharged from the storage tank 1 falls directly into the weighing tank 6 from the feed port. The lower surface of the weighing tank 6 is arranged into a triangular structure, and its interior is a slope at 45 degrees to the ground. The powder raw material will fall on the slope after being discharged, reducing the impact force of the powder raw material, thereby reducing the weighing error caused by the impact force. At the same time, since the minimum demand for powder raw materials is 300 kilograms of urea, the weighing error caused by the impact of the powder can be ignored. According to calculations and actual verification tests, the error has no effect on the quality of the preparation process of urea formaldehyde.

[0039] A weighing bracket 7 is connected to the side of the weighing tank 6, and a floor scale 12 is provided below the weighing bracket 7 and connected to the weighing bracket 7. The floor scale 12 is electrically connected to a control panel, and the control panel is electrically connected to the first-level valve 14 and the second-level valve 5. The weighing bracket is connected to the floor scale 12. At the same time, a soft connection is adopted between the weighing tank 6 and the material transfer assembly, so there is no impression on the weighing and no weighing error will occur. According to calculations and actual verification tests, there is no impact on the quality of the preparation process of urea formaldehyde.

[0040] When in use, the powder raw material is first discharged into the weighing tank 6 through the first-level discharge pipe 13. During the discharge process, the ground scale 12 is used for real-time weighing. When the discharge volume reaches 90% of the required weight fraction, such as 300 kg of urea is required, the ground scale 12 weighs 270 kg, and then sends an electrical signal to the control panel. The control panel sends a signal to control the first-level valve 14 to close and open the second-level valve 5 at the same time. Since the discharge speed of the second-level discharge pipe 4 is smaller, the discharge volume can be controlled more accurately. When the ground scale 12 weighs 300 kg, it sends an electrical signal to control the second-level valve 5 to close, and the discharge work is completed.

[0041] A discharge port is provided at the lower end of the weighing tank 6, and a discharge valve is provided at the discharge port. The discharge valve is connected to a flexible connecting pipe 8. The discharge of the powder raw material after weighing is controlled by the discharge valve. An opening is provided above the lower end of the transfer pipe 15 and is connected to the other end of the flexible connecting pipe 8. The discharged powder raw material enters the transfer pipe 15 from the opening.

[0042] The feeding pipe 15 is arranged at an angle, with the lower end connected to the weighing tank 6 and the upper end located above the reaction pot 19, so as to transfer the powder raw material obliquely upward and discharge it into the reaction pot 19. A screw rod is provided in the feeding pipe 15, and the lower end of the screw rod is connected to the lower end of the feeding pipe 15 through a bearing, and a sealing gasket is provided to ensure airtightness.

[0043] An auxiliary rod 11 is connected between two adjacent columns 3. There are two auxiliary rods 11 in total. A mounting frame 9 is provided on the auxiliary rod 11. A motor 10 is provided on the mounting frame 9. The motor 10 is also tilted. The output shaft of the motor 10 is provided with a driving wheel. The driving wheel is connected to a transmission belt and is connected to the driven wheel at the lower end of the screw rod through the transmission belt. The screw rod is driven to rotate by the motor 10. During the rotation of the screw rod, the powder raw material is pushed obliquely upward. A discharge pipe 18 is provided below the upper end of the transfer pipe 15. The powder raw material is discharged when it is pushed to the discharge pipe 18.

[0044] The material transfer assembly also includes a support part, which includes a number of ring buckles 16 arranged on the material transfer pipe 15 and a support rod 17 fixedly connected to the ring buckles 16. The lower end of the support rod 17 is fixedly set on the ground. The material transfer pipe 15 is supported by the support part, and the motor 10 is supported by the mounting frame 9 and the column 3. Therefore, the flexible connecting pipe 8 connected to the lower end of the weighing tank 6 will not generate a force on the weighing tank 6, so there is no impact on the weighing accuracy.

[0045] It should be noted that the terms "first, second and third" in the present invention are only used for descriptive purposes and do not indicate any order. They cannot be understood as indicating or implying relative importance. These terms can be interpreted as names.

[0046] Those skilled in the art will appreciate that the embodiments of the present invention described above and shown in the accompanying drawings are intended only as examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and illustrated in the embodiments. Any variations or modifications may be made to the embodiments of the present invention without departing from the principles herein.

Claims

1. A feeding device for urea resin production, characterized in that: include A material storage assembly, which is used to store sufficient amounts of powdered raw materials and discharge the powdered raw materials according to a preset weight fraction standard; a weighing assembly, which is used to receive and weigh the powdered raw materials discharged from the storage assembly, and send an electrical signal when a preset weight fraction is reached, and the storage assembly stops discharging the powdered raw materials; The material transfer assembly is used to transfer the weighed powder raw materials from the material weighing assembly to the reaction pot.

2. The feeding device for urea resin production according to claim 1, characterized in that: The material storage assembly, material weighing assembly and material transfer assembly are connected end to end to form a feeding device. There are three groups of feeding devices, which are used for feeding environmentally friendly formaldehyde, ordinary formaldehyde and urea respectively.

3. The feeding device for urea resin production according to claim 1, characterized in that: The material storage assembly includes a material storage tank, a material storage bracket is connected to the side of the material storage tank, and the material storage bracket is connected to a plurality of columns for supporting the material storage bracket; The lower end of the storage tank is provided with a discharge portion.

4. The feeding device for urea resin production according to claim 3, characterized in that: The discharge part includes a primary discharge pipe and a secondary discharge pipe. The primary discharge pipe is provided with a primary valve, and the secondary discharge pipe is provided with a secondary valve. The inner diameter of the primary discharge pipe is larger than that of the secondary discharge pipe.

5. The feeding device for urea resin production according to claim 4, characterized in that: The weighing assembly includes a weighing tank, the upper portion of which is provided with a feed port corresponding to the outlets of the primary discharge pipe and the secondary discharge pipe, and the powdered raw material discharged from the storage tank falls directly into the weighing tank from the feed port; A weighing bracket is connected to the side of the weighing tank, a floor scale is provided below the weighing bracket and connected to the weighing bracket, the floor scale is electrically connected to a control board, and the control board is electrically connected to the primary valve and the secondary valve; The lower end of the weighing tank is provided with a discharge port, a discharge valve is provided at the discharge port, and the discharge valve is connected to a soft connecting pipe.

6. The feeding device for urea resin production according to claim 5, characterized in that: The material transfer assembly includes an inclined material transfer pipe, a screw rod is provided in the material transfer pipe, the lower end of the screw rod is connected to the lower end of the material transfer pipe through a bearing, and the lower end of the screw rod is transmitted from the material transfer pipe and connected to a driven wheel; An auxiliary rod is connected between adjacent columns, a mounting frame is provided on the auxiliary rod, a motor is provided on the mounting frame, a driving wheel is provided on the output shaft of the motor, a transmission belt is connected to the driving wheel and connected to the driven wheel through the transmission belt; An opening is provided above the lower end of the material transfer pipe and is connected to the other end of the soft connecting pipe.

7. The feeding device for urea resin production according to claim 6, characterized in that: The material transfer assembly further comprises a support portion, which comprises a plurality of ring buckles arranged on the material transfer pipe and a support rod fixedly connected to the ring buckles, and the lower end of the support rod is fixedly arranged on the ground.

8. The feeding device for urea resin production according to claim 6, characterized in that: A discharge pipe is provided below the upper end of the material transfer pipe.

9. The feeding device for urea resin production according to claim 6, characterized in that: The motor is electrically connected to the control board.

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