Protective device for formaldehyde production

Abstract

The utility model discloses a protective device for formaldehyde production, which relates to the field of protective devices and comprises an exhaust hood, an exhaust pipeline fixedly mounted at the upper end of the exhaust hood, a filter screen frame fixedly mounted at the bottom of the exhaust hood, a filter screen fixedly mounted in the filter screen frame, and a cleaning mechanism arranged below the filter screen. The cleaning mechanism comprises a driving lead screw rotationally installed in the air exhaust cover body and a protective cover fixedly installed on one side of the air exhaust cover body, a lead screw nut is arranged on the driving lead screw, a sliding cross beam is fixedly installed on the lead screw nut, a cleaning scraper blade is fixedly installed on the sliding cross beam, and the upper end of the cleaning scraper blade abuts against the filter screen; a driving motor is fixedly installed at one end of the protective cover, a driving shaft is rotatably installed in the protective cover and is perpendicular to the driving lead screw, and knocking mechanisms are arranged at the four corners of the filter screen frame. According to the protective device for formaldehyde production, through cooperative use of the cleaning mechanism 5 and the knocking mechanism 6, the filter screen 4 is rapidly cleaned.

Description

Technical Field

[0001] This utility model relates to the field of protective devices, specifically a protective device for formaldehyde production. Background Technology

[0002] Formaldehyde is a colorless, irritating gas that can irritate the eyes and nose. It is readily soluble in water and ethanol, with aqueous solutions reaching concentrations up to 55%, known as formaldehyde solution or formalin. It can be produced by dehydrogenation or oxidation of methanol under the catalysis of metals such as silver and copper, or it can be separated from the oxidation products of hydrocarbons. It can be used as a raw material for phenolic resins, urea-formaldehyde resins, vinylon, hexamethylenetetramine, pentaerythritol, dyes, pesticides, and disinfectants.

[0003] In formaldehyde production, an evaporator is needed to process the formaldehyde. Evaporation is required before methanol undergoes catalytic oxidation, ensuring that methanol gas and water vapor combine before entering the oxidation reactor. However, in existing formaldehyde evaporators, a small amount of formaldehyde gas is released into the air during operation. A fume extraction hood is typically installed above the evaporator to absorb the formaldehyde; however, after prolonged use, the filter inside the hood easily becomes clogged with dust, affecting extraction efficiency. Furthermore, the high position of the hood makes cleaning inconvenient. Utility Model Content

[0004] The purpose of this invention is to provide a protective device for formaldehyde production, so as to solve the problem that the filter screen inside the exhaust hood is inconvenient to clean in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a protective device for formaldehyde production, comprising an extraction hood, an extraction pipe fixedly installed at the upper end of the extraction hood, a filter frame fixedly installed at the bottom of the extraction hood, a filter screen fixedly installed inside the filter frame, and a cleaning mechanism provided below the filter screen. The cleaning mechanism includes a drive screw rotatably installed inside the extraction hood and a protective cover fixedly installed on one side of the extraction hood. A screw nut is provided on the drive screw, and a sliding crossbeam is fixedly installed on the screw nut. A cleaning scraper is installed, with its upper end abutting against the filter screen. A drive motor is fixedly installed at one end of the protective cover, and a drive shaft is rotatably installed inside the protective cover, perpendicular to the drive screw. A striking mechanism is provided at the four corners of the filter screen frame. The striking mechanism includes striking seats fixedly installed at the four corners of the filter screen frame and positioning sleeves fixedly installed at the edges of both ends of the drive screw. The positioning sleeves are provided with fixing screws and springs are fixedly installed on the positioning sleeves. A striking steel ball is fixedly installed at the end of the spring. The positioning sleeves can drive the spring to rotate.

[0006] Preferably, both the drive shaft and the drive screw are equipped with helical gears, and the two sets of helical gears mesh together, so that the drive shaft can drive the helical gears to rotate.

[0007] Preferably, the output end of the drive motor is provided with a coupling, and one end of the drive shaft is fixed to the output end of the drive motor through the coupling, so that the drive motor can drive the drive shaft to rotate.

[0008] Preferably, bearings are provided at both ends of the drive shaft, the drive shaft is movably mounted inside the protective cover via the bearings, the sliding crossbeam is movably mounted inside the exhaust hood via a screw nut, and the cleaning scraper is movably mounted below the filter screen via the sliding crossbeam.

[0009] Preferably, a docking base is fixedly installed on the striking base, and docking screw holes are opened at the four corners of the docking base. Bolts are installed in the docking screw holes, and the docking base is fixed to the filter frame by bolts.

[0010] Preferably, the positioning sleeve has a threaded hole, and the fixing screw is connected to the positioning sleeve through the threaded hole.

[0011] Preferably, the positioning sleeve is fixed to the drive screw by fixing screws, and the striking steel ball is fixed to the positioning sleeve by springs, and the striking steel ball and the striking seat are on the same vertical plane.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this application, the operation of the drive motor enables the drive shaft to rotate. Subsequently, the rotation of the drive shaft will drive the lead screw to rotate accordingly. The rotation of the lead screw will further cause the lead screw nut to move axially. During this process, the forward movement of the lead screw nut will drive the cleaning scraper on the sliding beam to move synchronously along the surface of the filter screen, thereby achieving efficient cleaning of the filter screen.

[0014] 2. In the cleaning process of this application, the drive screw drives the positioning sleeve to rotate. Subsequently, the rotation of the positioning sleeve will drive the striking steel ball at the end of the spring to rotate accordingly. When the striking steel ball at the end of the spring rotates, it will continuously strike the striking seat on the filter screen frame, thereby causing the filter screen inside the filter screen frame to vibrate. This vibration helps to promote the removal of dust from the filter screen. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a partial structural schematic diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the cleaning mechanism of this utility model;

[0018] Figure 4 This utility model Figure 1 Enlarged view of point A in the middle.

[0019] The diagram shows the following components: 1. Exhaust hood; 2. Exhaust pipe; 3. Filter frame; 4. Filter screen; 5. Cleaning mechanism; 501. Drive screw; 502. Screw nut; 503. Cleaning scraper; 504. Sliding beam; 505. Drive motor; 506. Protective cover; 507. Drive shaft; 508. Helical gear; 6. Striking mechanism; 601. Connecting base; 602. Connecting screw hole; 603. Striking seat; 604. Striking steel ball; 605. Spring; 606. Positioning sleeve; 607. Fixing screw. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1 and Figure 2 As shown, this utility model provides a technical solution for a protective device for formaldehyde production, including an exhaust hood 1, an exhaust pipe 2 fixedly installed at the upper end of the exhaust hood 1, a filter frame 3 fixedly installed at the bottom of the exhaust hood 1, a filter screen 4 fixedly installed inside the filter frame 3, a cleaning mechanism 5 provided below the filter screen 4, and a knocking mechanism 6 provided at the four corners of the filter frame 3. By using the cleaning mechanism 5 and the knocking mechanism 6 together, the filter screen 4 can be cleaned quickly.

[0022] like Figure 2 and Figure 3 As shown, the cleaning mechanism 5 includes a drive screw 501 rotatably installed inside the exhaust hood 1 and a protective cover 506 fixedly installed on one side of the exhaust hood 1. The drive screw 501 is provided with a screw nut 502, and a sliding crossbeam 504 is fixedly installed on the screw nut 502. A cleaning scraper 503 is fixedly installed on the sliding crossbeam 504, and the upper end of the cleaning scraper 503 abuts against the filter screen 4. A drive motor 505 is fixedly installed at one end of the protective cover 506. A drive shaft 507 is rotatably installed inside the protective cover 506, and the drive shaft 507 is perpendicular to the drive screw 501. Both the drive shaft 507 and the drive screw 501 are provided with helical gears 508, and the two sets of helical gears 508 mesh together.

[0023] Specifically, the operation of the drive motor 505 can effectively drive the drive shaft 507 to rotate. When the drive shaft 507 starts to rotate, it will further drive the drive screw 501 to rotate. As the drive screw 501 rotates, the screw nut 502 will move forward along the screw. During the forward movement of the screw nut 502, it will push the cleaning scraper 503 on the sliding beam 504 to move forward close to the filter screen 4. In this way, the cleaning scraper 503 can quickly clean the filter screen 4 and ensure that it maintains a good filtration effect.

[0024] like Figure 1 and Figure 4 As shown, the striking mechanism 6 includes striking seats 603 fixedly installed at the four corners of the filter frame 3 and positioning sleeves 606 fixedly installed at the two ends of the drive screw 501. The positioning sleeves 606 are provided with fixing screws 607 and springs 605 are fixedly installed on the positioning sleeves 606. A striking steel ball 604 is fixedly installed at the end of the spring 605. A docking base 601 is fixedly installed on the striking seat 603. The docking base 601 has docking screw holes 602 at the four corners. Bolts are provided in the docking screw holes 602. The docking base 601 is fixed to the filter frame 3 by bolts.

[0025] Specifically, during the cleaning process, the drive screw 501 plays a key role, driving the positioning sleeve 606 to rotate. As the positioning sleeve 606 rotates, it further drives the striking steel ball 604 at the end of the spring 605 to rotate as well. When the striking steel ball 604 at the end of the spring 605 starts to rotate, it will continuously strike the striking seat 603 on the filter screen frame 3. This continuous striking action will cause the filter screen 4 inside the filter screen frame 3 to vibrate. Due to the vibration of the filter screen 4, the dust attached to the filter screen 4 will be more easily removed from the filter screen 4.

[0026] Working Principle: During use, the entire device is installed above the formaldehyde production equipment. Formaldehyde is extracted from the exhaust hood 1 via the exhaust pipe 2, creating a negative pressure within the hood 1 to absorb the formaldehyde volatilized into the air. During operation, the filter screen 4 filters dust from the air. Once excessive dust accumulates on the filter screen 4, the drive motor 505 is activated. Activating the drive motor 505 rotates the drive shaft 507, which in turn rotates the drive screw 501. The rotation of the drive screw 501 then moves the screw nut 502 forward. When the lead screw nut 502 moves forward, it drives the cleaning scraper 503 on the sliding beam 504 to move forward along the filter screen 4, thereby cleaning the filter screen 4. During the cleaning process, the drive screw 501 drives the positioning sleeve 606 to rotate. After the positioning sleeve 606 rotates, it drives the striking steel ball 604 at the end of the spring 605 to rotate. When the striking steel ball 604 at the end of the spring 605 rotates, it will continuously strike the striking seat 603 on the filter screen frame 3, causing the filter screen 4 inside the filter screen frame 3 to vibrate, making it easier for the dust on the filter screen 4 to fall off the filter screen 4, thus improving the cleaning effect.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A protective device for formaldehyde production, comprising an exhaust hood (1), wherein an exhaust pipe (2) is fixedly installed at the upper end of the exhaust hood (1), and a filter frame (3) is fixedly installed at the bottom of the exhaust hood (1), wherein a filter screen (4) is fixedly installed inside the filter frame (3), characterized in that: A cleaning mechanism (5) is provided below the filter screen (4). The cleaning mechanism (5) includes a drive screw (501) rotatably installed inside the exhaust hood (1) and a protective cover (506) fixedly installed on one side of the exhaust hood (1). A screw nut (502) is provided on the drive screw (501). A sliding beam (504) is fixedly installed on the screw nut (502). A cleaning scraper (503) is fixedly installed on the sliding beam (504), and the upper end of the cleaning scraper (503) abuts against the filter screen (4). A drive motor (505) is fixedly installed at one end of the protective cover (506). A drive shaft (507) is rotatably installed inside the protective cover (506), and the drive shaft (507) is perpendicular to the drive screw (501). The filter frame (3) is provided with a striking mechanism (6) at the four corners. The striking mechanism (6) includes a striking seat (603) fixedly installed at the four corners of the filter frame (3) and a positioning sleeve (606) fixedly installed at the two ends of the drive screw (501). The positioning sleeve (606) is provided with a fixing screw (607). A spring (605) is fixedly installed on the positioning sleeve (606). A striking steel ball (604) is fixedly installed at the end of the spring (605).

2. The protective device for formaldehyde production according to claim 1, characterized in that: Both the drive shaft (507) and the drive screw (501) are equipped with helical gears (508), and the two sets of helical gears (508) mesh together.

3. The protective device for formaldehyde production according to claim 2, characterized in that: The output end of the drive motor (505) is provided with a coupling, and one end of the drive shaft (507) is fixed to the output end of the drive motor (505) through the coupling.

4. A protective device for formaldehyde production according to claim 3, characterized in that: Bearings are provided at both ends of the drive shaft (507). The drive shaft (507) is movably installed in the protective cover (506) through the bearings. The sliding beam (504) is movably installed in the exhaust hood (1) through the screw nut (502). The cleaning scraper (503) is movably installed below the filter screen (4) through the sliding beam (504).

5. A protective device for formaldehyde production according to claim 4, characterized in that: A docking base (601) is fixedly installed on the striking base (603). The docking base (601) has docking screw holes (602) at its four corners. Bolts are provided in the docking screw holes (602). The docking base (601) is fixed to the filter frame (3) by bolts.

6. A protective device for formaldehyde production according to claim 1, characterized in that: The positioning sleeve (606) has a threaded hole, and the fixing screw (607) is connected to the positioning sleeve (606) through the threaded hole.

7. A protective device for formaldehyde production according to claim 1, characterized in that: The positioning sleeve (606) is fixed to the drive screw (501) by a fixing screw (607), and the striking steel ball (604) is fixed to the positioning sleeve (606) by a spring (605), and the striking steel ball (604) and the striking seat (603) are on the same vertical plane.

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