阅读说明：本技术 一种塑料粉末研磨设备以及超薄型塑料粉末的制造方法 (Plastic powder grinding equipment and manufacturing method of ultrathin plastic powder ) 是由 俞志金 俞凌峰 沈玖春 徐朔明 丁琴 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种塑料粉末研磨设备以及超薄型塑料粉末的制造方法,涉及粉末涂料生产领域,塑料粉末研磨设备包括：螺旋式研磨筒,贯穿螺旋式研磨筒的螺纹研磨辊组件,贯穿螺纹研磨辊组件的冷凝管,形成于螺旋式研磨筒与螺纹研磨辊组件之间的螺旋式研磨室,连接于螺旋式研磨室入口的进料斗,连接于螺旋式研磨室出口的双级分离筛组件,连接于双级分离筛组件与进料斗之间并将筛出的大颗粒粉末重新研磨的传送管,连接于双级分离筛组件的塑料粉末成品收集室；本发明特殊的结构不仅能够将塑料粉末研磨到直径小于25微米,而且能够及时对研磨辊降温,避免粉末热固化粘连,使得涂料喷涂的不仅均匀,而且喷的薄,比重轻,平方多。(The invention discloses a plastic powder grinding device and a manufacturing method of ultrathin plastic powder, relating to the field of powder coating production, wherein the plastic powder grinding device comprises: the device comprises a spiral grinding cylinder, a threaded grinding roller assembly penetrating through the spiral grinding cylinder, a condensation pipe penetrating through the threaded grinding roller assembly, a spiral grinding chamber formed between the spiral grinding cylinder and the threaded grinding roller assembly, a feed hopper connected to an inlet of the spiral grinding chamber, a two-stage separation screen assembly connected to an outlet of the spiral grinding chamber, a conveying pipe connected between the two-stage separation screen assembly and the feed hopper and used for re-grinding large granular powder screened out, and a plastic powder finished product collecting chamber connected to the two-stage separation screen assembly; the special structure of the invention not only can grind the plastic powder to the diameter less than 25 microns, but also can timely cool the grinding roller, thereby avoiding the thermosetting adhesion of the powder, and ensuring that the coating is sprayed uniformly, thin, light in specific gravity and much square.)

1. A plastic powder grinding apparatus, comprising: the spiral grinding cylinder, run through the screw thread abrasive roll subassembly of spiral grinding cylinder, run through the condenser pipe of screw thread abrasive roll subassembly, form the spiral grinding chamber between spiral grinding cylinder and screw thread abrasive roll subassembly, connect in the feeder hopper of spiral grinding chamber entry, connect in the doublestage separation sieve subassembly of spiral grinding chamber export, connect between doublestage separation sieve subassembly and feeder hopper and the conveying pipe that grinds the large granule powder that sieves out again, connect in the plastics powder finished product collecting chamber of doublestage separation sieve subassembly.

2. A plastic powder grinding apparatus as defined in claim 1, wherein the threaded grinding roller assembly comprises: the condenser tube grinding device comprises a rotary motor, a hollow shaft, a threaded grinding roller, a connecting bearing and a threaded grinding bulge, wherein the rotary motor is connected to a rotary shaft of the rotary motor, the hollow shaft is fixed on the rotary shaft and allows a condenser tube to pass through, the threaded grinding roller is sleeved outside the hollow shaft, the connecting bearing is connected between the hollow shaft and the threaded grinding roller, and the threaded grinding bulge is formed on the threaded grinding roller.

3. A plastic powder grinding apparatus as defined in claim 2, wherein the threaded grinding projections are provided with a plurality of spherical projections.

4. A plastic powder grinding apparatus according to claim 2, wherein a heat transfer sheet is provided between the hollow shaft and the threaded grinding roller.

5. A plastic powder grinding apparatus as defined in claim 1, wherein the dual stage separation screen assembly comprises: the first-stage cyclone separator is connected with a first-stage drying cold air sieve chamber of the first-stage cyclone separator, the second-stage cyclone separator is connected with the first-stage drying cold air sieve chamber, and the second-stage drying cold air sieve chamber is connected with the second-stage cyclone separator.

6. A plastic powder grinding apparatus according to claim 5, wherein the primary and secondary dry cold air sieve chambers comprise: the screen room body sets up in this internal screen cloth of screen room, sets up the dry cold air blower on the screen cloth, is fixed in on the dry cold air blower and sets up in this internal rocking arm connecting rod subassembly of screen room.

7. A plastic powder grinding apparatus according to claim 6, wherein the dry cold air blower comprises: the air-cooler sets up in the drying box of air-cooler entrance, connects in the flexible connecting pipe of fold of air-cooler, connects in the flexible connecting pipe of fold and is fixed in the horn wind gap of rocking arm connecting rod subassembly.

8. The plastic powder grinding apparatus of claim 6, wherein the screen mesh in the primary dry air screen chamber is 180 mesh and the screen mesh in the secondary dry air screen chamber is 240 mesh.

9. A plastic powder grinding apparatus as defined in claim 1 wherein a solid particle pump is disposed between the transfer tubes.

10. The method for manufacturing ultra-thin plastic powder as claimed in claim 1, comprising the steps of:

step one, preparing materials according to a formula;

the formula comprises the following components in percentage by mass: 35% of epoxy resin, 35% of polyester resin, 0-25% of titanium dioxide, 3.7-28.7% of pigment and filler, 0.3% of benzoin and 1% of flatting agent;

step two, respectively adding the ingredients in the formula into a stirrer, and stirring and mixing;

putting the uniformly stirred mixed raw materials into an extruder heated to 100-120 ℃ for extrusion;

and step three, grinding the extruded plastic particles by using the plastic powder grinding equipment as claimed in claim 1 to obtain the ultrathin plastic powder.

Technical Field

The invention relates to the field of plastic powder production, in particular to plastic powder grinding equipment and a manufacturing method of ultrathin plastic powder.

Background

The powder coating is a solid powder synthetic resin coating composed of solid resin, pigment, filler, auxiliary agent and the like. Unlike conventional solvent-based coatings and water-based coatings, the dispersion medium is not a solvent and water, but air. It has the characteristics of no solvent pollution, 100 percent film forming and low energy consumption. The powder coating is in a completely different form from general coating, and it exists in a state of fine powder. Since no solvent is used, it is called a powder coating. The powder coating is mainly characterized in that: has the characteristics of harmlessness, high efficiency, resource saving and environmental protection. According to various market demands, the market needs plastic powder with small particle size, so that the plastic powder can be sprayed to be thin, has light specific gravity and more squares and has large market demand;

however, since plastics have thermosetting properties, if grinding is too violent, the generated heat causes powder adhesion, and the market demands a grinding apparatus capable of reducing the temperature during grinding.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide plastic powder grinding equipment and a manufacturing method of ultrathin plastic powder, wherein the special structure can grind the plastic powder to the diameter of less than 25 micrometers, and can timely cool a grinding roller to avoid thermosetting adhesion of the powder, so that the coating is uniformly sprayed, and the sprayed coating is thin, light in specific gravity and many in squares.

In order to achieve the above object, the present invention adopts the following technical solutions:

a plastic powder grinding apparatus comprising: the spiral grinding cylinder, the screw thread abrasive roll subassembly that runs through the spiral grinding cylinder, the condenser pipe that runs through screw thread abrasive roll subassembly, the spiral grinding chamber who forms between spiral grinding cylinder and screw thread abrasive roll subassembly, connect in the feeder hopper of spiral grinding chamber entry, connect in the doublestage separation sieve subassembly of spiral grinding chamber export, connect between doublestage separation sieve subassembly and feeder hopper and the conveying pipe that grinds the large granule powder that sieves out again, connect in the plastics powder finished product collection room of doublestage separation sieve subassembly.

In the plastic powder grinding apparatus, the threaded grinding roller assembly includes: the rotary motor is connected with a rotating shaft of the rotary motor, the hollow shaft is fixed on the rotating shaft and allows the condensation pipe to pass through, the thread grinding roller is sleeved outside the hollow shaft, the connecting bearing is connected between the hollow shaft and the thread grinding roller, and the thread grinding bulge is formed on the thread grinding roller.

In the plastic powder grinding device, the connecting bearing is a cylindrical roller bearing.

In the plastic powder grinding device, the thread grinding protrusions are provided with a plurality of spherical protrusions.

In the plastic powder grinding device, the heat transfer sheet is arranged between the hollow shaft and the threaded grinding roller.

In the plastic powder grinding device, the two-stage separation sieve assembly comprises: the first-stage cyclone separator is connected with a first-stage drying cold air sieve chamber of the first-stage cyclone separator, the second-stage cyclone separator is connected with the first-stage drying cold air sieve chamber, and the second-stage drying cold air sieve chamber is connected with the second-stage cyclone separator.

The plastic powder grinding equipment comprises a primary drying cold air sieve chamber and a secondary drying cold air sieve chamber, wherein the primary drying cold air sieve chamber and the secondary drying cold air sieve chamber comprise: the screen room body sets up in this internal screen cloth of screen room, sets up the dry cold air blower on the screen cloth, is fixed in on the dry cold air blower and sets up in this internal rocking arm connecting rod subassembly of screen room.

In an aforementioned plastic powder grinding device, the drying and cooling air blower includes: the air-cooler sets up in the drying box of air-cooler entrance, connects in the flexible connecting pipe of fold of air-cooler, connects in the flexible connecting pipe of fold and is fixed in the horn wind gap of rocking arm connecting rod subassembly.

In the plastic powder grinding equipment, the screen in the primary drying cold air screening chamber is 180 meshes, and the screen in the secondary drying cold air screening chamber is 240 meshes.

In the plastic powder grinding device, the solid particle pump is arranged between the conveying pipes.

The manufacturing method of the ultrathin plastic powder comprises the following steps:

step one, preparing materials according to a formula;

the formula comprises the following components in percentage by mass: 35% of epoxy resin, 35% of polyester resin, 0-25% of titanium dioxide, 3.7-28.7% of pigment and filler, 0.3% of benzoin and 1% of flatting agent;

step two, respectively adding the ingredients in the formula into a stirrer, and stirring and mixing;

putting the uniformly stirred mixed raw materials into an extruder heated to 100-120 ℃ for extrusion;

and step three, grinding the extruded plastic particles by using the plastic powder grinding equipment as claimed in claim 1 to obtain the ultrathin plastic powder.

The invention has the advantages that:

the grinding equipment is arranged in a spiral shape, and the plastic powder can be ground to a diameter of less than 25 micrometers by matching with a plurality of spherical protrusions;

the invention is provided with the condenser pipe, and the heat transfer sheet is matched to exchange the heat expressed by the grinding roller in time, so that the grinding roller is cooled, the thermoplastic adhesion of powder is avoided, and the coating is uniformly sprayed;

the proportion of the epoxy resin and the polyester resin in the formula is high, and the organic component is high;

the drying cold air sieve chambers are provided with two stages, and the sieve holes are from big to small, so that the uniformity of the plastic powder is ensured;

the drying and cooling effects are realized while the drying and cooling air sieve chamber is used for sieving, and meanwhile, the plastic powder is blown by air pressure, so that the plastic powder is prevented from blocking sieve pores;

the overall design makes the paint spraying thin, light in specific gravity and much square.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of a threaded grinding lobe according to one embodiment of the present invention;

figure 3 is a schematic structural view of one embodiment of a screen chamber body of the present invention.

The meaning of the reference symbols in the figures:

1 spiral grinding vessel, 2 rotating electrical machines, 3 rotation axes, 4 hollow shafts, 5 screw thread grinding rollers, 51 screw thread grinding protrusions, 511 spherical protrusions, 6 connecting bearings, 7 condenser pipes, 8 spiral grinding chambers, 9 feed hoppers, 10 conveying pipes, 11 plastic powder finished product collecting chambers, 12 heat transfer sheets, 13 primary cyclone separators, 14 primary dry cold air sieve chambers, 15 secondary cyclone separators, 16 secondary dry cold air sieve chambers, 17 solid particle pumps, 18 sieve chamber bodies, 19 sieve screens, 20 dry cold air fans, 201 air coolers, 202 drying boxes, 203 fold expansion connecting pipes, 204 horn tuyeres and 21 rocker arm connecting rod assemblies.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

As shown in fig. 1, a plastic powder grinding apparatus includes: spiral grinding vessel 1, run through spiral grinding vessel 1's screw thread grinding roller 5 subassembly, run through condenser pipe 7 of screw thread grinding roller 5 subassembly, form in spiral grinding chamber 8 between spiral grinding vessel 1 and screw thread grinding roller 5 subassembly, connect in the feeder hopper 9 of spiral grinding chamber 8 entry, connect in the doublestage separation sieve subassembly of spiral grinding chamber 8 export, connect the conveying pipe 10 that grinds the large granule powder that sieves out again between doublestage separation sieve subassembly and feeder hopper 9, connect in the plastics powder finished product collection room 11 of doublestage separation sieve subassembly. Preferably, the spiral grinding cylinder 1 is inclined to the horizontal plane at an angle of 45 °.

The threaded grinding roller 5 assembly comprises: the apparatus includes a rotary motor 2, a rotary shaft 3 connected to the rotary motor 2, a hollow shaft 4 fixed to the rotary shaft 3 and allowing a condenser tube 7 to pass therethrough, a thread grinding roller 5 fitted over the hollow shaft 4, a connection bearing 6 connected between the hollow shaft 4 and the thread grinding roller 5, and a thread grinding protrusion 51 formed on the thread grinding roller 5. The rotating shaft 3 is driven by the rotating motor 2 to drive the hollow shaft 4 to rotate, the hollow shaft 4 drives the thread grinding roller 5 through the connecting bearing 6, the thread grinding roller 5 grinds particles in the spiral grinding chamber 8, and the spiral grinding cylinder 1 is in an inclined state, so that the particles entering from the feed hopper 9 are ground layer by layer along a spiral.

The connection bearing 6 is preferably a cylindrical roller bearing, and the type of the bearing is not limited as long as it can connect the hollow shaft 4 and the threaded grinding roller 5, and can be applied to the present invention.

As shown in fig. 2, the threaded grinding protrusion 51 is provided with a plurality of spherical protrusions 511; the design enables the powder to be subjected to secondary grinding on the basis of the original powder, so that the ground particle size is extremely fine; the following experiments show that: the diameter of the spherical protrusions 511 is preferably 2 to 5 mm.

A heat transfer sheet 12 is provided between the hollow shaft 4 and the threaded grinding roller 5, and the heat transfer sheet 12 is preferably an aluminum sheet.

The dual stage separation screen assembly includes: a primary cyclone separator 13, a primary drying cold air sieve chamber 14 connected to the primary cyclone separator 13, a secondary cyclone separator 15 connected to the primary drying cold air sieve chamber 14, and a secondary drying cold air sieve chamber 16 connected to the secondary cyclone separator 15; as shown in fig. 3, the primary drying and cooling air sieve chamber and the secondary drying and cooling air sieve chamber include: the screen room comprises a screen room body 18, a screen 19 arranged in the screen room body 18, a drying and cooling air fan 20 arranged on the screen 19, and a rocker arm connecting rod assembly 21 fixed on the drying and cooling air fan 20 and arranged in the screen room body 18; the drying cool air blower 20 includes: the air cooler 201, the drying box 202 arranged at the inlet of the air cooler 201, the fold telescopic connecting pipe 203 connected to the air cooler 201, and the horn tuyere 204 connected to the fold telescopic connecting pipe 203 and fixed to the rocker arm connecting rod assembly 21; preferably, the corrugated telescopic connecting pipe 203 is a corrugated aluminum pipe, so that the air cooler 201 cannot be pulled when the rocker arm swings left and right, and the air cooler 201 is ensured to be stably fixed; the drying box 202 can be a powder drying box 202 or a water-absorbing bead drying box 202, and is not limited. The rocker arm connecting rod can be bought into the existing rocker, and can also be assembled by the connecting rod, the electronic rotating shaft and the like.

Preferably, the screen 19 in the primary drying cold air screen chamber 14 is 180 meshes; as another preference, the screen 19 in the secondary dry cold air screen chamber 16 is 240 mesh.

The conveying pipe 10 is connected to the upper end of the screen 19, unqualified powder is conveyed to the feed hopper 9 and is ground again, and the design ensures that the solid particle pump 17 is arranged between the powder conveying pipes 10 and ensures smooth operation.

A method for manufacturing ultra-thin plastic powder comprises the following steps:

step one, preparing materials according to a formula;

the formula comprises the following components in percentage by mass: 35% of epoxy resin, 35% of polyester resin, 0-25% of titanium dioxide, 3.7-28.7% of pigment and filler, 0.3% of benzoin and 1% of flatting agent; the proportion of the epoxy resin and the polyester resin in the formula is high, and the organic component is high; the choice of the leveling agent is not limited, and any leveling agent that can be used in the formulation of the present invention can be used in the present invention, and as a preferable leveling agent, leveling agent PV88 is used.

Step two, respectively adding the ingredients in the formula into a stirrer, and stirring and mixing;

putting the uniformly stirred mixed raw materials into an extruder heated to 100-120 ℃ for extrusion;

and step three, grinding the extruded plastic particles by using the plastic powder grinding equipment as claimed in claim 1 to obtain the ultrathin plastic powder.

The grinding operation process comprises the following steps: the condensing system injects condensate water into the condensing pipe 7, and then the heat transfer sheet 12 is matched to exchange heat expressed by the grinding roller in time, so that the grinding roller is cooled firstly. Particles extruded by an extruder enter a spiral grinding chamber 8 from a feed hopper 9, a rotating motor 2 drives a rotating shaft 3 to drive a hollow shaft 4 to rotate, the hollow shaft 4 drives a thread grinding roller 5 through a connecting bearing 6, the thread grinding roller 5 spirally rises or falls in a spiral grinding cylinder 1, the thread grinding roller 5 grinds the particles in the spiral grinding chamber 8, the spiral grinding cylinder 1 is in an inclined state, so the particles entering from the feed hopper 9 are ground layer by layer along a spiral, powder is screened at a first level through a primary cyclone separator 13 and a primary dry cold air screen chamber 14, the unqualified particles enter a conveying pipe 10 to reenter the feed hopper 9, the qualified particles enter a secondary cyclone separator 15 and a secondary dry cold air screen chamber 16 to be screened at a second level, and the unqualified particles enter the conveying pipe 10 to reenter the feed hopper 9, screening qualified plastic powder products to enter a plastic powder finished product collecting chamber 11; the design of the invention ensures that the paint is thin in spraying, light in specific gravity and much square.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.