Anti-blocking structure for dust removal pipeline of polyformaldehyde grinding system

Abstract

The utility model discloses an anti-clogging structure of a dedusting pipeline of a polyformaldehyde grinding system, which comprises a bag-type dust collector and a boiler, the inlet end of the bag-type dust collector is provided with a feed pipe, the feed pipe is provided with a differential pressure gauge, and one side of the feed pipe close to the root of the differential pressure gauge is provided with a steam jacket ball valve. An air inlet pipe and an air outlet pipe are arranged at the air inlet end and the air outlet end of the steam jacket ball valve respectively, a gate valve is arranged on the air inlet pipe, the air inlet pipe and the air outlet pipe are communicated with the boiler, and a blowing unit used for blowing polymers is arranged on the feeding pipe. The problems that the production efficiency is delayed, the workload of workers is increased, and the working time of the workers is prolonged due to the fact that a blocked pipeline is regularly cleaned in a polyformaldehyde grinding system are solved. According to the utility model, the steam jacket ball valve and the boiler are arranged on the pipeline, so that the temperature value of the pipeline can be ensured, polymers are melted, and the root of a pressure measuring point is prevented from being blocked; and the blowing unit is arranged to blow away fine powder, so that timely detection of powder staining of the cloth bag is guaranteed, and system control is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline anti-blocking structures, in particular to an anti-blocking structure for a dust removal pipeline of a polyoxymethylene grinding system. Background Technique

[0002] Polyoxymethylene (POM) is one of the five widely used engineering plastics at present, mainly including the following two types: homopolymer and copolymer polyoxymethylene. As a crystalline thermoplastic resin, it is often used in the preparation of plastics, coatings, adhesives, fibers, etc. This substance is also called "super steel" and "stolen steel", and can be used as a substitute for many metals to produce some parts in many industries. Polyoxymethylene is produced by the polycondensation reaction of a polymer (TOX) and formaldehyde. The working principle of the polyoxymethylene grinding system is as follows: First, the polyoxymethylene in the hopper is transported to the crusher by a feeder. After being crushed, the material enters the bag filter through a pipeline under the action of a centrifugal fan to remove the dust in the material. The centrifuge is located on the outlet pipeline of the bag filter. After the dust is removed, the material enters the cooler through a pipeline. After the gas is cooled, the grinding operation of polyoxymethylene is completed.

[0003] When the temperature of the polymer (TOX) in polyoxymethylene is lower than 60 °C, the polymer will crystallize, resulting in the blockage of the root of the pressure measuring point. There is a risk of shutdown after the blockage. Therefore, the staff will regularly stop the machine to clean the blocked pipeline.

[0004] However, when the staff regularly clean the pipeline, they need to stop the operation of the grinding system and then clean it, which delays the production efficiency and increases the working time and workload of the staff. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-blocking structure for a dust removal pipeline of a polyoxymethylene grinding system to solve the problems that the blocked pipeline of the polyoxymethylene grinding system is regularly cleaned, resulting in the delay of production efficiency and the increase of the workload and working time of workers.

[0006] To achieve the above object, the basic scheme provided by the utility model is: an anti-blocking structure for a dust removal pipeline of a polyoxymethylene grinding system, including a bag filter and a boiler. The inlet end of the bag filter is provided with a feed pipe, a differential pressure gauge is arranged on the feed pipe, a steam jacket ball valve is arranged on one side of the feed pipe close to the root of the differential pressure gauge. The inlet end and the outlet end of the steam jacket ball valve are respectively provided with an inlet pipe and an outlet pipe. A gate valve is arranged on the inlet pipe. The inlet pipe and the outlet pipe are communicated with the boiler, and a purging unit for purging the polymer is arranged on the feed pipe.

[0007] The working principle of the present utility model is as follows: during use, first open the gate valve on the intake pipe, so that the steam in the boiler enters the steam jacket ball valve through the intake pipe. The steam entering the steam jacket ball valve continuously provides temperature to the pipeline and the root of the pressure measuring point. The steam that has provided heat and a small amount of condensed water return to the boiler through the outlet pipe, and this cycle is carried out to prevent the crystallization of polymers from blocking the root of the pressure measuring point. Then, through the purging unit, the excess fine powder can be blown away.

[0008] The beneficial effects of the present utility model are as follows: by setting a steam jacket ball valve and a boiler on the pipeline, the temperature value of the pipeline can be guaranteed, polymers can be melted, and blockage at the root of the pressure measuring point can be avoided; and a purging unit is set to blow away the fine powder, ensuring timely detection of powder adhesion on the filter bag and stable system control.

[0009] Solution two, which is the optimization of the basic solution. The purging unit includes a nitrogen gas tank. The outlet end of the nitrogen gas tank is provided with a nitrogen gas pipe. One end of the nitrogen gas pipe is connected to the feed pipe located between the bag filter and the steam jacket ball valve. A valve is provided on the nitrogen gas pipe.

[0010] Solution three, which is the optimization of solution two. The valve is a globe valve. A pressure gauge is provided on the nitrogen gas pipe, and the pressure gauge is located between the nitrogen gas tank and the globe valve; setting a globe valve and a pressure gauge on the nitrogen gas pipe facilitates controlling the flow rate of nitrogen gas and prevents the pressure of nitrogen gas from being too large, resulting in large fluctuations in the detection of the differential pressure gauge.

[0011] Solution four, which is the optimization of the basic solution. A steam trap is provided on the intake pipe; setting a steam trap on the intake pipe can prevent the flow of condensed water, thereby ensuring the stable flow of water vapor.

[0012] Solution five, which is the optimization of the basic solution. A thermometer is provided on the intake pipe; setting a thermometer on the intake pipe facilitates observing the temperature of the intake pipe.

[0013] Solution six, which is the optimization of the basic solution. A glass tube sight glass is provided on the feed pipe, and the glass tube sight glass is located between the bag filter and the steam jacket ball valve; setting a glass tube sight glass at one end of the feed pipe located between the bag filter and the steam jacket ball valve facilitates observing the flow condition inside the feed pipe. Description of the Drawings

[0014] Figure 1 is a flow chart of a dust removal pipeline anti-blocking structure of a polyoxymethylene powder grinding system of the present utility model. Detailed Embodiments

[0015] The following further details the present utility model through specific embodiments:

[0016] The reference numerals in the accompanying drawings of the specification include: 1. Bag filter; 10. Feed pipe; 101. Differential pressure gauge; 102. Steam jacket ball valve; 103. Inlet pipe; 104. Outlet pipe; 105. Steam trap; 106. Thermometer; 107. Glass tube sight glass; 108. Gate valve; 2. Boiler; 3. Nitrogen tank; 301. Nitrogen pipe; 302. Globe valve; 303. Pressure gauge.

[0017] As Figure 1 shown: A polyoxymethylene grinding system dust removal pipeline anti-blocking structure includes a bag filter 1 and a boiler 2. The inlet end flange of the bag filter 1 is connected to a feed pipe 10. A glass tube sight glass 107 is provided at one end of the feed pipe 10 between the bag filter 1 and the steam jacket ball valve 102. A differential pressure gauge 101 is provided on the feed pipe 10. A steam jacket ball valve 102 is provided on one side of the feed pipe 10 near the root of the differential pressure gauge 101. The model of the steam jacket ball valve 102 is BQ41F. The inlet end and the outlet end of the steam jacket ball valve 102 are respectively flange-connected to an inlet pipe 103 and an outlet pipe 104. A gate valve 108 is provided on the inlet pipe 103. A steam trap 105 and a thermometer 106 are provided on the inlet pipe 103. The inlet pipe 103 and the outlet pipe 104 are communicated with the boiler 2. A purging unit for purging polymers is provided on the feed pipe 10. The purging unit includes a nitrogen tank 3. The outlet end of the nitrogen tank 3 is provided with a nitrogen pipe 301. A valve is provided on the nitrogen pipe 301. The valve is a globe valve 302. A pressure gauge 303 is provided on the nitrogen pipe 301. The pressure gauge 303 is located between the nitrogen tank 3 and the globe valve 302. One end of the nitrogen pipe 301 is communicated with the feed pipe 10.

[0018] The implementation mode of this embodiment is as follows: When in use, first open the gate valve 108 on the inlet pipe 103, so that the steam in the boiler 2 enters the steam jacket ball valve 102 through the inlet pipe 103. The steam entering the steam jacket ball valve 102 continuously provides temperature to the pipeline and the root of the pressure measuring point. The steam and a small amount of condensed water after providing heat return to the boiler 2 through the outlet pipe 104, and circulate in this way, so as to prevent polymers from crystallizing and blocking the root of the pressure measuring point. Then open the switch of the nitrogen tank 3. Nitrogen enters the feed pipe 10 through the nitrogen pipe 301 and flows in the same direction as the polymer, purging the melted polymer at the pipeline and the root of the pressure measuring point into the bag filter 1. At the same time, observe the pressure gauge 303 and control the globe valve 302 to make the nitrogen pressure value between 0.5 and 1 kPa.

[0019] The above are only embodiments of the present utility model, and common general knowledge such as specific structures and characteristics known in the art are not described in detail herein. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several modifications and improvements can be made, which should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicability of the patent. The protection scope required by this application shall be subject to the content of its claims, and the specific implementation manners and the like recorded in the specification can be used to interpret the content of the claims.

Claims

1. A dust removal pipeline anti-blocking structure for a polyoxymethylene grinding system, characterized in that: The invention comprises a bag filter (1) and a boiler (2), wherein a feed pipe (10) is provided at the inlet end of the bag filter (1), a differential pressure gauge (101) is provided on the feed pipe (10), a steam jacketed ball valve (102) is provided on the side of the feed pipe (10) close to the root of the differential pressure gauge (101), an air inlet pipe (103) and an air outlet pipe (104) are provided on the air inlet end and the air outlet end of the steam jacketed ball valve (102), a gate valve (108) is provided on the air inlet pipe (103), the air inlet pipe (103) and the air outlet pipe (104) are connected to the boiler (2), and a purge unit for purging polymers is provided on the feed pipe (10).

2. The anti-blocking structure for dust removal pipeline of polyoxymethylene grinding system according to claim 1 is characterized in that: The purge unit comprises a nitrogen tank (3), the outlet end of the nitrogen tank (3) is provided with a nitrogen pipe (301), one end of the nitrogen pipe (301) is connected to a feed pipe (10), and a valve is provided on the nitrogen pipe (301).

3. The anti-blocking structure for dust removal pipeline of polyoxymethylene grinding system according to claim 2 is characterized in that: The valve is a stop valve (302), and a pressure gauge (303) is provided on the nitrogen pipe (301), and the pressure gauge (303) is located between the nitrogen tank (3) and the stop valve (302).

4. The anti-blocking structure for dust removal pipeline of polyoxymethylene grinding system according to claim 1 is characterized in that: The air inlet pipe (103) is provided with a drain valve (105).

5. The anti-blocking structure for dust removal pipeline of polyoxymethylene grinding system according to claim 1, characterized in that: The air inlet pipe (103) is provided with a thermometer (106).

6. The anti-blocking structure for dust removal pipeline of polyoxymethylene grinding system according to claim 1, characterized in that: The feed pipe (10) is provided with a glass tube sight glass (107), and the glass tube sight glass (107) is located between the bag filter (1) and the steam jacketed ball valve (102).

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