CN210186932U

CN210186932U - Screw rod of MMA monomer production usefulness

Info

Publication number: CN210186932U
Application number: CN201822140878.1U
Authority: CN
Inventors: Zhenhui Huo; 霍振辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-12-19
Filing date: 2018-12-19
Publication date: 2020-03-27
Anticipated expiration: 2028-12-19

Abstract

The utility model discloses a screw rod for MMA monomer production, which comprises a rod body, a feeding fan blade group and a reaction fan blade group, wherein the feeding fan blade group is formed by arranging feeding fan blades along the rod body in the same circumference, and the reaction fan blade group is formed by arranging reaction fan blades along the rod body in the same circumference; the inclination angle of the feeding fan blades is larger than that of the reaction fan blades; the reaction fan blade groups are axially arranged on the rod body at intervals of a preset distance; an exhaust gap is arranged between the adjacent reaction fan blades in the same group. Adopt the utility model discloses, be equipped with exhaust gap between the adjacent reaction flabellum of same group, can in time with MMA gas outgoing, prevent that the gas that ya keli schizolysis produced from piling up between the reaction flabellum, prop bad or prop bad with the straight tube with the reaction flabellum.

Description

Screw rod of MMA monomer production usefulness

Technical Field

The utility model relates to a special screw rod especially relates to a screw rod of MMA monomer production usefulness.

Background

Methyl methacrylate is an organic compound, also known as MMA, abbreviated as methylmethacrylate. Is an important chemical raw material, and is a monomer for producing transparent plastic polymethyl methacrylate (polymethyl methacrylate, PMMA). MMA can be cracked out by heating the acrylic plate used for producing the bathtub to a certain temperature, the waste acrylic plate is recovered, heated and cracked, and the main cracked product MMA is recovered and stored, so that the method is an effective method for recycling the acrylic plate.

The existing acrylic plate heating mainly uses a boiler, the acrylic plate is placed in the boiler for heating, and cracked gas is collected at the top of the boiler. The disadvantages of using this method are: 1. the heat preservation of the boiler is poor, and a large amount of energy is consumed in the heating process. 2. The acrylic plates in the boiler are heated unevenly, the temperature of the peripheral acrylic plates is too high, the central acrylic plates do not reach the cracking and evaporating temperature, and the cracking efficiency and the recovery quality are influenced. 3. The heated slag needs to be cleaned by opening a cover of the boiler, and the MMA gas has irritation, so that the health of operators is affected.

Some enterprises try to use the existing feeding screw and the straight pipe with the heating device to heat the acrylic edge, but the threads of the existing screw are designed into a whole, gas after the acrylic heating cannot be discharged quickly, and the screw or the straight pipe is easy to be stressed and expand to damage.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a screw rod of MMA monomer production usefulness is provided, can stabilize the propulsion with ya keli to in time discharge the MMA gas.

In order to solve the technical problem, the utility model provides a screw rod for producing MMA monomers, which comprises a rod body, a feeding fan blade group and a reaction fan blade group, wherein the feeding fan blade group is formed by arranging feeding fan blades along the rod body in the same circumference, and the reaction fan blade group is formed by arranging reaction fan blades along the rod body in the same circumference; the inclination angle of the feeding fan blades is larger than that of the reaction fan blades; the reaction fan blade groups are axially arranged on the rod body at intervals of a preset distance; an exhaust gap is arranged between the adjacent reaction fan blades in the same group.

As an improvement of the scheme, all the reaction fan blades of the same reaction fan blade group are positioned in the same spiral plane.

As an improvement of the scheme, all the reaction fan blades of the same reaction fan blade group have the same structure and are circumferentially arranged on the same radial node.

As an improvement of the scheme, the feeding fan blade group consists of 3 feeding fan blades.

As an improvement of the scheme, the reaction fan blade group consists of 3 reaction fan blades.

As an improvement of the scheme, the rod body is provided with a strengthening sleeve.

Implement the utility model discloses, following beneficial effect has:

the utility model discloses a body of rod, feeding fan blade group and reaction fan blade group are equipped with exhaust clearance between the adjacent reaction flabellum of group, can in time with MMA gas outgoing, prevent that the gas that the ya keli schizolysis produced from piling up between the reaction flabellum, prop bad or prop bad with the straight tube with the reaction flabellum.

Drawings

FIG. 1 is a schematic diagram of a heating system for MMA monomer production according to the present invention;

fig. 2 is a schematic structural view of a first heating pipe, a second heating pipe or a third heating pipe of the present invention;

fig. 3 is a schematic structural view of a first embodiment of the screw of the present invention;

fig. 4 is a schematic structural view of a second embodiment of the screw of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. Only this statement, the utility model discloses the upper and lower, left and right, preceding, back, inside and outside etc. position words that appear or will appear in the text only use the utility model discloses an attached drawing is the benchmark, and it is not right the utility model discloses a concrete restriction.

As shown in fig. 1, an embodiment of the present invention provides a heating system for MMA monomer production, including a first heating pipe, a second heating pipe 2, and a third heating pipe 3 connected in sequence, where screw rods 4 are disposed in the first heating pipe 1, the second heating pipe 2, and the third heating pipe 3, and the first heating pipe 1, the second heating pipe 2, and the third heating pipe 3 are all provided with a heating device 5; the front end of the first heating pipe 1 is provided with a feeding hole 11, the first heating pipe 1 is provided with a first air outlet pipe 6, different positions on the second heating pipe 2 are provided with second air outlet pipes 7, different positions on the third heating pipe 3 are provided with third air outlet pipes 8, the second heating pipe 2 is connected with the third heating pipe 3 through a vent pipe 10 which is vertically arranged, the second heating pipe 2 is connected with the side surface of the vent pipe 10, the third heating pipe 3 is connected with the lower end of the vent pipe 10, and the upper end of the vent pipe 10 is connected with a fourth air outlet pipe 9.

Adopt this embodiment, can make the acrylic granule after smashing heat in first heating pipe, second heating pipe and the third heating pipe in heating system in proper order to make the gaseous separation out of splitting under the propelling movement of screw rod and stirring effect, after the segmentation gets into each outlet duct, collected, realize MMA monomer's cyclic utilization.

The equipment is closed in the whole heating process, no pollution gas is emitted, and the equipment is safe and environment-friendly. Acrylic is fully stirred and dispersed in the heating process, the cracking efficiency can be improved, the conversion speed is increased, and the discharge amount of residues is reduced.

The working principle and the steps of the scheme are explained in detail by combining the specific structure of the scheme as follows:

1. and crushing the recycled acrylic plate to obtain acrylic particles.

2. Add ya keli granule from the feed inlet 11 of first heating pipe 1, screw rod 4 in the first heating pipe 1 is rotatory, and simultaneously, heating device 5 on the first heating pipe 1 begins to heat first heating pipe 1, and ya keli granule begins to heat up. Referring to fig. 2, the heating device 5 is an induction heating coil wound on the surface of the first heating pipe 1, the second heating pipe 2 or the third heating pipe 3; the surfaces of the first heating pipe 1, the second heating pipe 2 or the third heating pipe 3 are coated with an insulating layer 51 to prevent heat dissipation.

Referring to fig. 3, in order to improve the stacking of the acrylic particles in the heating tube, the screw 4 has a special structure: the screw 4 comprises a rod body 41, a feeding fan blade group 42 and a reaction fan blade group 43, wherein the feeding fan blade group 42 is formed by arranging feeding fan blades along the rod body 41 in the same circumference, and the reaction fan blade group 43 is formed by arranging reaction fan blades along the rod body 41 in the same circumference; the inclination angle of the feeding fan blades is larger than that of the reaction fan blades; the reaction fan blade groups 43 are axially arranged on the rod body 41 at intervals of a preset distance; an exhaust gap 44 is arranged between adjacent reaction fan blades in the same group. When ya keli granule and screw rod 4 contact, the great feeding fan blade group 42 of inclination can be relatively fast with yakeli granule forward transport, guarantees that the space that gets into yakeli granule in the first heating pipe 1 is compressed, improves the treatment effeciency. The rod body 41 is provided with a strengthening sleeve 45, so that the rigidity of the reaction fan blade group 43 and the rigidity of the feeding fan blade group 42 are improved conveniently.

Then, the acrylic particles contact with the reaction fan blade set 43, and the reaction fan blade set 43 pushes the acrylic forward, and also plays a role in turning the acrylic so as to heat the acrylic uniformly, and more importantly, ensures that the gas generated by cracking can be discharged quickly. According to a first embodiment of the reaction fan blade group 43 of the present invention, all the reaction fan blades 43a of the same reaction fan blade group 43 are located in the same spiral plane. The feeding fan blade group 42 consists of 3 feeding fan blades; the reaction fan blade group 43 is composed of 3 reaction fan blades 43 a. At this time, all the reaction blades 43a appear as if the screw threads of the screws were cut with 3 cuts in the axial direction, and the cuts form the exhaust gap 44. By adopting the structure, because the reaction fan blades 43a move on the thread line, the conveying of the acrylic is more stable, and after the acrylic between each group of reaction fan blades 43a is cracked to generate gas, each time the exhaust gap 44 of the reaction fan blades 43a faces upwards, the generated gas can move towards different reaction fan blade groups 43 from the exhaust gap 44 until being exhausted from the first air outlet pipe 6.

As shown in fig. 4, according to the second embodiment of the reaction fan blade group 43 of the present invention, all the reaction fan blades 43b of the same reaction fan blade group 43 have the same structure and are circumferentially arranged on the same radial node. At this time, all the reaction blades 43b look like blades of a general fan, and the exhaust gap 44 is naturally formed by the gap between the reaction blades 43 b. Adopt this structure, ya keli is when every group reaction fan blade group 43, all by thorough stirring, more is favorable to gas outgoing, and ya keli is heated also more evenly, nevertheless, must be through the diameter proportion of design feeding fan blade group 42 and reaction fan blade 43b to the feed rate of this control yakeli prevents that the feeding from causing the frictional force between the yakeli too big at the excessive speed, makes the unable rotation of screw rod 4 or deformation damage.

The first air outlet pipe 6 is provided with a pressure gauge and a sampling mechanism 12, and the pressure of the first air outlet pipe can be monitored through the pressure gauge, so that whether the acrylic reaches the initial cracking temperature or not can be known; the sampling mechanism 12 is used for detecting the components of the gas generated by cracking, and is convenient for monitoring the components of the subsequent cracking of the acrylic which is just added.

3. The acrylic acid moves among the first heating pipe 1, the second heating pipe 2 and the third heating pipe 3 in sequence until all MMA monomers are cracked and discharged. The temperatures of the first heating pipe 1, the second heating pipe 2 and the third heating pipe 3 are sequentially increased, and the temperatures thereof are between 300 and 600 degrees. The first heating pipe 1 and the second heating pipe 2, and the second heating pipe 2 and the third heating pipe 3 are arranged perpendicular to each other. The vertically arranged three sections of tube bodies enable the acrylic to be subjected to steering or dropping when different tube bodies are used, and the blocked acrylic is easy to separate in the steering or dropping process, so that the cracking is convenient to continue.

The second outlet pipes 7 are respectively arranged on the second heating pipes 2 and close to the joints of the second heating pipes 2 and the first heating pipes 1 or the vent pipes 10, and the third outlet pipes 8 are respectively arranged in three groups, are uniformly distributed on the third heating pipes 3 at intervals and are simultaneously connected into the outlet collecting pipe 81. The second heating pipe 2 is connected with the third heating pipe 3 through a vent pipe 10 which is vertically arranged, the second heating pipe 2 is connected with the side face of the vent pipe 10, and the third heating pipe 3 is connected with the lower end of the vent pipe 10. The acrylic acid g sent from the end of the second heating pipe 2 has undergone temperature rise at both ends and mostly cracked, but part of the acrylic acid containing impurities may also be aggregated into blocks and difficult to separate. At this moment, after such ya keli gets into permeability cell 10, because do not have screw rod 4 in the permeability cell 10, can not receive the hindrance of screw rod 4, its space is also obviously great, and it is vertical setting moreover, and yakeli carries out the free fall motion here, utilizes self gravity, separates the yakeli piece. Or in the space, the pressure outside the acrylic block is reduced, the gas in the acrylic block can bounce open the acrylic block into several blocks, escape from the bounced acrylic blocks, and then directly discharge from the fourth gas outlet pipe 9 at the top of the gas permeable pipe 10. The first air outlet pipe 6, the second air outlet pipe 7, the third air outlet pipe 8 and the fourth air outlet pipe 9 are communicated with corresponding collecting devices, and produced MMA monomers are collected.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. The screw for producing the MMA monomer is characterized by comprising a rod body, a feeding fan blade group and a reaction fan blade group, wherein the feeding fan blade group is formed by arranging feeding fan blades along the rod body in the same circumference, and the reaction fan blade group is formed by arranging reaction fan blades along the rod body in the same circumference; the inclination angle of the feeding fan blades is larger than that of the reaction fan blades; the reaction fan blade groups are axially arranged on the rod body at intervals of a preset distance; an exhaust gap is arranged between the adjacent reaction fan blades in the same group.

2. A screw for MMA monomer production according to claim 1 wherein all reaction blades of a same set of reaction blades lie within a same spiral plane.

3. A screw for MMA monomer production according to claim 1 wherein all reaction blades of a same reaction blade set are of identical construction and are circumferentially disposed at a common radial node.

4. A screw for MMA monomer production according to claim 2 or 3 wherein the feed fan set consists of 3 feed fan blades.

5. A screw for MMA monomer production according to claim 2 or 3 wherein the reaction fan blade set consists of 3 reaction fan blades.

6. A screw for producing MMA monomer according to claim 1, wherein the rod body is provided with a reinforcing sleeve.