CN207327521U - A kind of injection device suitable for TPU - Google Patents
A kind of injection device suitable for TPU Download PDFInfo
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- CN207327521U CN207327521U CN201721134777.2U CN201721134777U CN207327521U CN 207327521 U CN207327521 U CN 207327521U CN 201721134777 U CN201721134777 U CN 201721134777U CN 207327521 U CN207327521 U CN 207327521U
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- tpu
- screw rod
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- main thread
- injection device
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Abstract
The utility model discloses a kind of injection device suitable for TPU, including rubber melting cylinder, screw rod, cross rubber head, ring flange and nozzle, screw rod includes the body of rod and the main thread set around the body of rod, screw rod includes feeding section, compression section and the homogenizing zone set gradually along the direction of TPU flowings, the root footpath of main thread is constant in feeding section, and the outside diameter of the main thread of feeding section becomes larger along the TPU directions flowed；The outside diameter of main thread is constant in compression section, and the end set that the root footpath of the main thread of compression section becomes larger homogenizing zone along the TPU directions flowed has mixing section, and mixing section includes round table-like body, some helicla flutes are provided with the radial outer wall of body；The compression ratio of screw rod is 2.1 2.35.A kind of injection device suitable for TPU of the utility model, the problems such as easily overdoing to shear-sensitive for TPU, the contracting that this screw rod is chosen is compared for 2.1 2.35, and the compression ratio i that general other general spiro rods take is 2.4 2.6 or so, and crossing reduces compression ratio so as to reduce shear action of the screw rod to melt.
Description
Technical field
It the utility model is related to a kind of injection device, more particularly to a kind of injection device suitable for TPU.
Background technology
Thermoplastic polyurethane elastomer, English entitled Thermoplastic polyurethanes, abbreviation TPU, be between
A kind of high molecular material of rubber and plastics.TPU is by diisocyanates such as diphenylmethane diisocyanates or toluene di-isocyanate(TDI)s
What esters molecule and the common reactive polymeric of macromolecular polyol, low molecular polylol formed.TPU has remarkable high-tension, height
Pulling force, tough and ageing-resistant characteristic, are a kind of ripe environment-friendly materials.At present, TPU is widely used to health care, electricity
Sub- electric appliance, industry and physical culture etc., it is with the incomparable intensity height of other plastic materials, good toughness, wear-resisting, resistance to
The characteristics such as cold, oil resistant, water-fast, ageing-resistant, weatherability.TPU easily overdoes shear-sensitive, injection molding machine of the prior art, it is noted
Injection device shear action during being molded to TPU is excessive, easily causes melt to overheat and degrade, causes yield rate
It is low.
Utility model content
The utility model aims to solve the problem that above-mentioned mentioned technical problem, there is provided a kind of injection device suitable for TPU, can
The shear action to TPU is reduced, to improve yield rate and final product quality.
The utility model is realized by following technical solution：
A kind of injection device suitable for TPU, including rubber melting cylinder, fever circle, excessively screw rod, rubber head, ring flange and nozzle, institute
State screw rod to be arranged in rubber melting cylinder, the fever snare is located on rubber melting cylinder, and the nozzle is arranged on the discharge end of rubber melting cylinder simultaneously
Connected by ring flange with rubber melting cylinder, the rubber head of crossing is arranged between screw rod and ring flange, and the screw rod includes the body of rod and ring
The main thread set around the body of rod, the pitch of main thread is constant along the conveying direction of TPU, and the screw rod includes the side flowed along TPU
To feeding section, compression section and the homogenizing zone set gradually, the root footpath of main thread is constant in feeding section, outside the main thread of feeding section
Footpath becomes larger along the TPU directions flowed；The outside diameter of main thread is constant in compression section, and the root footpath of the main thread of compression section is along TPU
The direction of flowing becomes larger；The root footpath of main thread and outside diameter are constant in homogenizing zone；The end set of the homogenizing zone has mixed
Section is refined, the mixing section includes round table-like body, some helicla flutes are provided with the radial outer wall of body；The pressure of the screw rod
The ratio that contracts is 2.1-2.35.
Further, the direction that the groove depth of the helicla flute is flowed along TPU shoals successively.
Further, the rubber head of crossing includes work department, threaded joints and is arranged on work department and threaded joints
Between transition part, and work department, threaded joints and transition part three are connected as a single entity, and an annular table is equipped with transition part
Shoulder, is provided with the mounting hole being connected with threaded joints on mixing section.
Further, the work department offers some grooves axially set and is set around work department circumferential lateral surface
Some annular grooves, each annular groove respectively with each texturearunaperpendicular set.
Further, the nozzle includes mouth body and connector, and the mouth body is connected by connector with ring flange.
Further, the connector includes body and injection passage, and the body both ends are both provided with external screw thread and divide
It is not connected with ring flange and mouth body, the injection passage includes the first cylindrical hole, the first gradual change hole and the second cylindrical hole, institute
The both ends for stating the first gradual change hole are connected with the first cylindrical hole and the second cylindrical hole respectively, and the diameter edge in the first gradual change hole
The direction of PET flowings is gradually reduced；First cylindrical hole is connected with ring flange, and the second cylindrical hole is connected with mouth body, and the
The diameter of one cylindrical hole is more than the diameter of the second cylindrical hole.
Further, the mouth body includes the threaded hole, the second gradual change hole and the plastic hole that are connected with connector, and described second
The both ends in gradual change hole are connected with threaded hole and plastic hole respectively, and the diameter in the second gradual change hole is gradual along the direction that PET flows
Reduce.
Further, the draw ratio of the screw rod is 20-24.
Beneficial effect is：Compared with prior art, a kind of injection device suitable for TPU, it is easy to shear-sensitive for TPU
The problems such as overdoing, the contracting that this screw rod is chosen are compared for 2.1-2.35, and the compression ratio i that general other general spiro rods take is 2.4-
2.6 or so, crossing reduces compression ratio so as to reduce shear action of the screw rod to melt.
Brief description of the drawings
Specific embodiment of the present utility model is described in further detail below in conjunction with attached drawing, wherein：
Fig. 1 is the structure diagram of the utility model injection device；
Fig. 2 is the structure diagram of the utility model screw rod；
Fig. 3 is the structure diagram that the utility model crosses rubber head；
Fig. 4 is the structure diagram of the utility model connector；
Fig. 5 is the structure diagram of the utility model mouth body.
Embodiment
As depicted in figs. 1 and 2, a kind of injection device suitable for TPU, including rubber melting cylinder 1, fever circle, excessively screw rod 2, glue
First 3, ring flange 4 and nozzle 5, the screw rod 2 are arranged in rubber melting cylinder 1, and the fever snare is located on rubber melting cylinder 1, described to penetrate
Mouth 5 is arranged on the discharge end of rubber melting cylinder 1 and is connected by ring flange 4 with rubber melting cylinder 1, and the rubber head 3 of crossing is arranged on screw rod 2 and method
Between blue disk 4, the screw rod 2 includes the body of rod and the main thread 21 set around the body of rod, the conveying of the pitch of main thread 21 along TPU
Direction is constant, and the screw rod 2 includes the direction feeding section, compression section and the homogenizing zone that set gradually along TPU flowings, in feeding section
The root footpath of main thread 21 is constant, and the outside diameter of the main thread 21 of feeding section becomes larger along the TPU directions flowed；Main spiral shell in compression section
The outside diameter of line 21 is constant, and the root footpath of the main thread 21 of compression section becomes larger along the TPU directions flowed；Main thread 21 in homogenizing zone
Root footpath and outside diameter it is constant；The end set of the homogenizing zone has mixing section 22, and the mixing section 22 includes round table-like sheet
Body 51, is provided with some helicla flutes in the radial outer wall of body 51；The compression ratio of the screw rod 2 is 2.1-2.35.In general,
Each section of ratio of general spiro rod 2 is as follows：Feeding section accounts for 45-50%, and compression section accounts for 20-30%, and homogenizing zone accounts for 20-30%.This
It is as follows that utility model screw rod 2 adjusts each section of ratio：Feeding section accounts for 57%, and compression section accounts for 25%, and homogenizing zone accounts for 18%.First, add
The ratio of long feeding section, can prevent melt from prematurely entering compression section, slow down and prematurely carry out high shear to melt；Secondly,
Reduce the ratio of compression section and homogenizing zone, it is possible to reduce screw rod 2 carries out melt the time of high shear forces.On the other hand, originally
For utility model screw rod 2 also by reducing compression ratio, the compression ratio i that general other general spiro rods 2 take is 2.4-2.6 or so, this
It is 2.1-2.35 that screw rod 2, which chooses compression ratio, so as to reduce shear action of the screw rod 2 to melt.
It is strong for TPU adhesions, the problems such as screw rod 2 is serious is glued, by varying 2 the selection of material of screw rod and surface treatment mode
To achieve the purpose that improvement problem.In general, 2 the selection of material of general spiro rod is 38CrMoAlA, and surface treatment mode is nitrogen
Change, 2 chosen material of the utility model screw rod is 42CrMo, and surface treatment mode is equipped with hard chromium layers, table for plating hard chrome, and surface
Face finish improves, and friction coefficient reduces, and the possibility of buildup sizing is greatly decreased.42CrMo steel belongs to unimach, tool
There are high intensity and toughness, quenching degree is also preferable, without obvious temper brittleness, has higher fatigue limit after modifier treatment and resists more
Secondary Shocks ability, low-temperature impact toughness are good.The hard chromium layers on surface, mainly increase surface smoothness, wearability and corrosion resistance.
The outside diameter of the main thread 21 of feeding section becomes larger along the direction of Flow of Goods and Materials, and gap is more bigger toward air discharge duct 24,
So as to play certain scavenging action；The outside diameter of main thread 21 is constant in compression section, and the root footpath of the main thread 21 of compression section is along thing
The direction that stream is moved becomes larger, and further improves compression efficiency；The root footpath of main thread 21 and outside diameter are constant in homogenizing zone, just
In control flow.
Further, the direction that the groove depth of the helicla flute is flowed along TPU shoals successively.By by being deep to shallow change,
Compression homo-effect is further improved, and promotes to merge.
Further, as shown in figure 3, the rubber head 3 of crossing includes work department 31, threaded joints 32 and is arranged on work
Transition part 33 between portion 31 and threaded joints 32, and work department 31, threaded joints 32 and 33 three of transition part are linked as
One, an annular shoulder is equipped with transition part 33, the mounting hole being connected with threaded joints 32 is provided with mixing section 22.Ring
Shape shoulder can be used for installing cushion rubber.In conventional art, injection molding machine plasticizing part is kneaded simply in the rotation process of screw rod 2
Plastics are kneaded by the mixing section 22 of screw rod 2, after certain time, screw rod 2 can be worn, melting effect
It can gradually reduce, just need replacing the screw rod 2 with mixing section 22 at this time to remedy.But 2 production cycle of screw rod is long, manufactures
Of high cost, it is also inconvenient to replace.In the present solution, can be with auxiliary threaded rod 2 to molten in mixing process by rationally designing rubber head 3
Material futher stirs mixing, can significantly improve melting effect.
Further, the work department 31 offers some grooves axially set and surround 31 circumferential lateral surface of work department
Some annular grooves set, each annular groove are respectively set with each texturearunaperpendicular.Annular groove and groove design can at the same time into
The axial stirring of row, radially stir, and is kneaded stirring more thoroughly so that the raw material for adding additive is fully plasticized and mixes.Annular groove
Rubber head 3 is had larger gap with groove design, also there is certain scavenging action in injection and sealing.
Further, the nozzle 5 includes mouth body and connector, and the mouth body is connected by connector with ring flange 4.
During use, injection molding machine would generally be docked with different moulds and used, and requirement of the different moulds to nozzle 5 is also different,
Therefore, when using different moulds, nozzle 5 is often replaced, existing nozzle 5 is all unitary design, and is processed more
Complexity, to have multiple nozzles 5 will increase production cost.This programme can meet a nozzle 5 by replacing connector
Multiple and different mould requirements, effectively reduce cost.
Further, as shown in figure 4, the connector includes body 51 and injection passage, 51 both ends of body are all provided with
It is equipped with external screw thread and is connected respectively with ring flange 4 and mouth body, the injection passage includes the first cylindrical hole 52, the first gradual change hole
53 and second cylindrical hole 54, the both ends in the first gradual change hole 53 respectively with the first cylindrical hole 52 and the second cylindrical hole 54
Connection, and the diameter in the first gradual change hole 53 is gradually reduced along the PET directions flowed；First cylindrical hole 52 connects with ring flange 4
Logical, the second cylindrical hole 54 is connected with mouth body, and the diameter of the first cylindrical hole 52 is more than the diameter of the second cylindrical hole 54.
Further, as shown in figure 5, the mouth body include be connected with connector threaded hole 55, the second gradual change hole 56 and
Plastic hole 57, the both ends in the second gradual change hole 56 are connected with threaded hole 55 and plastic hole 57 respectively, and the second gradual change hole 56
Diameter be gradually reduced along the PET directions flowed.
Further, the draw ratio of the screw rod 2 is 20-24, which is particularly suitable for being injection moulded TPU.
Above example is only not limited to illustrate the technical solution of the utility model, all without departing from this
Any modification of utility model spirit and scope or equivalent substitution, it should all cover the scope in technical solutions of the utility model
It is interior.
Claims (8)
1. a kind of injection device suitable for TPU, including rubber melting cylinder (1), fever circle, excessively screw rod (2), rubber head (3), ring flange
(4) it is arranged on nozzle (5), the screw rod (2) in rubber melting cylinder (1), the fever snare is located on rubber melting cylinder (1), described to penetrate
Mouth (5) is arranged on the discharge end of rubber melting cylinder (1) and is connected by ring flange (4) with rubber melting cylinder (1), and the rubber head (3) of crossing is set
Between screw rod (2) and ring flange (4), it is characterised in that the screw rod (2) includes the body of rod and the main thread set around the body of rod
(21), the pitch of main thread (21) is constant along the conveying direction of TPU, and the screw rod (2) includes setting successively along the direction of TPU flowings
Feeding section, compression section and the homogenizing zone put, the root footpath of main thread (21) is constant in feeding section, the main thread (21) of feeding section it is outer
Footpath becomes larger along the TPU directions flowed；The outside diameter of main thread (21) is constant in compression section, the root of the main thread (21) of compression section
Footpath becomes larger along the TPU directions flowed；The root footpath of main thread (21) and outside diameter are constant in homogenizing zone；The end of the homogenizing zone
Portion is provided with mixing section (22), and the mixing section (22) includes round table-like body (51), set in the radial outer wall of body (51)
It is equipped with some helicla flutes；The compression ratio of the screw rod (2) is 2.1-2.35.
A kind of 2. injection device suitable for TPU according to claim 1, it is characterised in that the groove depth of the helicla flute
The direction flowed along TPU shoals successively.
3. a kind of injection device suitable for TPU according to claim 1, it is characterised in that the rubber head (3) of crossing includes
Work department (31), threaded joints (32) and the transition part being arranged between work department (31) and threaded joints (32)
(33), and work department (31), threaded joints (32) and transition part (33) three are connected as a single entity, and are equipped with transition part (33)
One annular shoulder, is provided with the mounting hole being connected with threaded joints (32) on mixing section (22).
4. a kind of injection device suitable for TPU according to claim 3, it is characterised in that the work department (31) is opened
Some annular grooves set equipped with some grooves axially set and around work department (31) circumferential lateral surface, each annular groove are equal
Set respectively with each texturearunaperpendicular.
5. a kind of injection device suitable for TPU according to claim 1, it is characterised in that the nozzle (5) includes mouth
Body and connector, the mouth body are connected by connector with ring flange (4).
6. a kind of injection device suitable for TPU according to claim 5, it is characterised in that the connector includes this
Body (51) and injection passage, body (51) both ends are both provided with external screw thread and are connected respectively with ring flange (4) and mouth body, institute
Stating injection passage includes the first cylindrical hole (52), the first gradual change hole (53) and the second cylindrical hole (54), first gradual change
The both ends in hole (53) are connected with the first cylindrical hole (52) and the second cylindrical hole (54) respectively, and the first gradual change hole (53)
Diameter is gradually reduced along the PET directions flowed；First cylindrical hole (52) is connected with ring flange (4), the second cylindrical hole (54)
Connected with mouth body, and the diameter of the first cylindrical hole (52) is more than the diameter of the second cylindrical hole (54).
7. a kind of injection device suitable for TPU according to claim 5, it is characterised in that the mouth body is included with connecting
Threaded hole (55), the second gradual change hole (56) and plastic hole (57), the both ends of the second gradual change hole (56) that fitting connects are distinguished
Connected with threaded hole (55) and plastic hole (57), and the diameter in the second gradual change hole (56) is gradually reduced along the PET directions flowed.
A kind of 8. injection device suitable for TPU according to claim 1, it is characterised in that the major diameter of the screw rod (2)
Than for 20-24.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721134777.2U CN207327521U (en) | 2017-09-05 | 2017-09-05 | A kind of injection device suitable for TPU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721134777.2U CN207327521U (en) | 2017-09-05 | 2017-09-05 | A kind of injection device suitable for TPU |
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| Publication Number | Publication Date |
|---|---|
| CN207327521U true CN207327521U (en) | 2018-05-08 |
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ID=62371515
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721134777.2U Active CN207327521U (en) | 2017-09-05 | 2017-09-05 | A kind of injection device suitable for TPU |
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| Country | Link |
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| CN (1) | CN207327521U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108974625A (en) * | 2018-06-22 | 2018-12-11 | 四会市研创电器有限公司 | A kind of filler strip and its manufacture craft |
-
2017
- 2017-09-05 CN CN201721134777.2U patent/CN207327521U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108974625A (en) * | 2018-06-22 | 2018-12-11 | 四会市研创电器有限公司 | A kind of filler strip and its manufacture craft |
| CN108974625B (en) * | 2018-06-22 | 2020-06-09 | 四会市研创电器有限公司 | Filler strip and manufacturing process thereof |
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