CN221619892U - Steel band plastic-coated mould - Google Patents

Abstract

The utility model relates to a steel strip plastic-coated die which comprises a die body, a die body cover, a die core and a die, wherein the die core comprises a first die core, a second die core and a third die core, a material channel sequentially penetrates through the die body cover, the first die core, the second die core, the third die core, the die body and the die, the runner comprises a feeding runner, a guiding runner and a shunting runner, the feeding runner, the guiding runner and the shunting runner are symmetrically distributed by taking the material channel as a symmetrical axis, and the shunting runner comprises a first runner positioned between the first die core and the second die core, a second runner positioned between the second die core and the third die core and a third runner positioned between the third die core and the die body. In the scheme, three flow channels are arranged in the steel strip plastic-coated die to respectively coat plastic on the steel strip, and can be used for shunting the material flow of the feeding flow channel, so that the phenomenon that the steel strip is punched and deviated in the material channel due to overlarge impact force of the material flow in the flow channel is avoided.

Description

Steel band plastic-coated mould

Technical Field

The utility model relates to the technical field of steel strip plastic coating, in particular to a steel strip plastic coating die.

Background

Along with the development of society and the progress of science and technology, the industrial production of the present day gradually replaces manual operation, so that mechanized equipment is more widely applied to the production and manufacturing process of various products. The steel belt can be produced in various modes in the production process, meanwhile, in order to prolong the service life of the steel belt, the steel belt is prevented from rusting in the use process, the surface of the steel belt is generally subjected to plastic coating treatment, a plastic coating is arranged on the surface of the steel belt, the plastic coating can prevent the steel belt from directly contacting with air, the rusting probability of the steel belt is reduced, and the service life of the steel belt is prolonged.

When the outer surface of the steel belt is subjected to plastic coating treatment, in order to improve the operation efficiency, a plastic coating die is generally used for coating the outer surface of the steel belt, the plastic coating die is provided with an upper feed inlet, a lower feed inlet and an upper runner and a lower runner, molten material flows are coated on two sides of the steel belt through the upper feed inlet, the lower feed inlet and the runners when the steel belt passes through the plastic coating die, and the injection molding work of the steel belt is completed after cooling. However, when the plastic-coated die is used for coating plastic on the outer surface of the steel belt, the fact that the die used in the industry at present mostly adopts a group of runners, the kinetic energy carried in the moving process of the material flow in the runners is high, the impact force of the material flow on the steel belt is overlarge, the steel belt is easy to deviate under the impact of the material flow, the continuity of uneven wall thickness can be caused in the extrusion process, the phenomenon of deviation wall occurs, and the quality of the steel belt is affected.

Disclosure of utility model

The utility model provides a steel belt plastic-coated die, which aims to solve the problem that the impact force of a material flow on a steel belt is overlarge and the steel belt is easy to deviate under the impact of the material flow by adopting a group of flow channels in the prior art. The mould in this scheme is equipped with multiunit runner, adopts the impact force of multiunit runner dispersion material flow, can reduce the impact force of material flow, avoids the material flow impact force too big to dash the off tracking with the steel band.

The technical scheme adopted by the utility model is as follows: the utility model provides a steel band plastic-coated mould, includes die body and die body lid, mold core and the bush of all being connected with die body fixed, and the mold core is located the die body, and die body lid and bush are located the feed end and the discharge end of die body respectively. The mold core comprises a first mold core, a second mold core and a third mold core, and a material channel for a steel belt to pass through sequentially passes through the mold body cover, the first mold core, the second mold core, the third mold core, the mold body and the mouth mold. The runner comprises a feeding runner, a guiding runner and a flow dividing runner which are communicated in sequence, and the other end of the flow dividing runner is communicated with the material channel. The feeding flow channel, the guiding flow channel and the flow dividing flow channel are symmetrically distributed by taking the material channel as a symmetrical axis, namely, the two sides of the material channel are provided with die bodies and die cores with the same structure, and the die bodies and the die cores on the two sides of the material channel are symmetrically distributed by taking the material channel as a symmetrical axis. The feeding runner is located in the die body cover, the guide runner is located between the die body and the die core, and the flow dividing runner comprises a first runner located between the first die core and the second die core, a second runner located between the second die core and the third die core and a third runner located between the third die core and the die body.

The material flow in this scheme flows into the direction runner between die body and the mold core from the feeding runner on the die body lid, flows into the reposition of redundant personnel runner from the direction runner again, flows into on the steel band in the material passageway from the reposition of redundant personnel runner at last, accomplishes the plastic-coated of steel band. After entering the die, the steel belt advances along the material channel, firstly, the steel belt passes through the first runner, the material flow in the first runner enters the material channel and is coated on the surface of the steel belt, the first plastic coating of the steel belt is completed, then, the steel belt passes through the second runner, the material flow in the second runner is coated on the surface of the steel belt, the second plastic coating of the steel belt is completed, finally, the steel belt passes through the third runner, the material flow in the third runner is coated on the surface of the steel belt, the third plastic coating of the steel belt is completed, and the steel belt after the third plastic coating is completed comes out of the material channel on the die. Meanwhile, the number of mold cores can be increased or decreased according to the number of times of plastic coating actually required.

In the scheme, three flow channels are arranged in the steel strip plastic-coated die to respectively coat plastic on the steel strip, the three flow channels can split the material flow of the feeding flow channel, so that the phenomenon that the steel strip is washed and deviated in the material channel due to overlarge impact force of the material flow in the flow channels is avoided, in addition, the three flow channels form three impact points on the steel strip, and the deviation rectifying effect on the steel strip can be achieved.

Preferably, the width of the first flow channel outlet is greater than the width of the second flow channel outlet, and the width of the second flow channel outlet is greater than the width of the third flow channel outlet. In the plastic coating process of the steel belt, the thicker the plastic coating thickness is, the larger the shrinkage degree of the plastic coating surface after cooling is, the more appearance defects are easy to appear on the outer surface of the steel belt, otherwise, the thinner the plastic coating thickness is, and the smaller the appearance defects are generated after cooling shrinkage. The widths of the discharge ports of the first flow channel, the second flow channel and the third flow channel are gradually decreased, so that the plastic coating thickness of the steel strip passing through the first flow channel, the second flow channel and the third flow channel is gradually decreased. The first layer of plastic coating provided by the first flow channel can be covered by the second layer of plastic coating provided by the second flow channel after appearance defects are generated by cooling shrinkage of the steel strip, and the appearance defects generated by the second layer of plastic coating provided by the second flow channel during cooling shrinkage can be covered by the third layer of plastic coating provided by the third flow channel, so that the probability of appearance defects on the surface of the steel strip can be further reduced, and the surface of the steel strip after the plastic coating is finished can be attractive.

Preferably, the discharge hole of the feeding flow channel is circular, the guide flow channel is provided with a feeding part communicated with the discharge hole of the feeding flow channel, the feeding part is conical, and the caliber of one end, far away from the feeding flow channel, of the conical feeding part is smaller than that of one end, close to the feeding flow channel. The discharge gate of feeding runner has a plurality of, and the discharge gate of a plurality of feeding runner is the linear equidistance and arranges on the die body lid, and the feeding portion has a plurality of, and every feeding portion all communicates with the discharge gate of a feeding runner. The discharge gate of feeding runner is circular for the material flow can be quick pass the feeding runner and enter into in the direction runner. When the material flow enters the guide flow channel, the material flow firstly enters the conical feeding part, and the material flow is extruded by the conical feeding part after entering the conical feeding part, so that the material flow has enough power to enter the guide flow channel. The conical feeding part can better guide and split the material flow, so that the material flow can quickly fill the guide flow channel. The feed inlet has a plurality of, can accelerate the velocity that the material flows into in the mould for the material flows can more even quick entering into in the mould.

Preferably, the first runner is conical, and the width of the first runner feed inlet is larger than the width of the first runner discharge outlet; the second flow channel is conical, and the width of the second flow channel material inlet is larger than that of the second flow channel material outlet; the third flow channel is conical, and the width of the third flow channel feed inlet is larger than the width of the third flow channel discharge outlet. The first runner, the second runner and the third runner of toper can increase the pressure when the material flows out for the material flows can be more abundant adhere to on the steel band, and the plastic-coated effect of steel band is better.

Preferably, the first flow channel, the second flow channel and the third flow channel are parallel, and the included angle between the first flow channel and the material channel is 15-65 degrees. The first flow channel, the second flow channel and the third flow channel are parallel, namely the angles of the material flows in the three flow channels flowing out of the flow channels are the same, the angles of the material flows flowing out of the three flow channels are consistent when the material flows contact with the steel strip, the covering effect is better, and the plastic coating effect of the steel strip is better. Through the research surface, when the included angle between the first runner and the material channel is within 15-65 degrees, the plastic coating effect on the steel belt is better.

Preferably, the second mold core is provided with a chamfer for guiding the material flow, the chamfer is arranged at one end of the second mold core, the second mold core is provided with a second flow channel feeding hole, the second mold core is provided with a first flow channel discharging hole, the third mold core is provided with a third flow channel feeding hole, the third mold core is provided with a third flow channel discharging hole, and the third mold core is provided with a third flow channel discharging hole. The second mold core, the third mold core and the mold body are provided with chamfer angles, so that a better guiding effect can be achieved on the material flow, the material flow can smoothly flow into the diversion flow passage from the guiding flow passage, and the material flow can flow onto the steel belt from the diversion flow passage.

Preferably, the die further comprises two connecting plates, wherein the two connecting plates are respectively positioned at two sides of the die body and fixedly connected with the die body, and two ends of the die body cover are respectively and fixedly connected with the two connecting plates. The setting of connecting plate can be further with two die bodies and a die body lid installation fixed, improves the holistic joint strength of mould.

Preferably, the die body cover is provided with a groove, the die body is provided with a bulge, and the bulge is positioned in the groove and is attached to the groove. The arrangement of the bulges and the grooves can facilitate the positioning of the die body and the die body cover during the assembly of the die body and the die body cover, and the installation is convenient.

Preferably, the die is provided with a material passing opening for the steel belt to pass through, a material channel on the die is the material passing opening, and the width and the height of the material passing opening are the same as those of the steel belt after plastic coating. The die is connected with the die body through bolts, straight slot holes are formed in the die, and the bolts penetrate through the straight slot holes to be connected with the die body. The material passing opening on the die can prevent the steel belt from deviating in the die and can limit the plastic coating thickness of the steel belt. The arrangement of the straight slot holes can finely adjust the installation position of the die on the die body, and further prevent the steel belt from deviating.

Compared with the prior art, the utility model has the beneficial effects that: in the scheme, three flow channels are arranged in the steel strip plastic-coated die to respectively coat plastic on the steel strip, the three flow channels can split the material flow of the feeding flow channel, so that the phenomenon that the steel strip is washed and deviated in the material channel due to overlarge impact force of the material flow in the flow channels is avoided, in addition, the three flow channels form three impact points on the steel strip, and the deviation rectifying effect on the steel strip can be achieved.

Drawings

FIG. 1 is a cross-sectional view of a steel strip plastic-coated die of the present utility model;

FIG. 2 is an internal structural view of a steel strip plastic-coated die of the present utility model;

FIG. 3 is a rear view of a steel strip plastic-coated die of the present utility model;

FIG. 4 is a section view of section A of FIG. 3 of a steel strip plastic-coated die according to the present utility model;

FIG. 5 is a section B of FIG. 3 of a steel strip plastic-coated die according to the present utility model;

FIG. 6 is a schematic view of a mold body cover of a steel strip plastic-coated mold according to the present utility model;

FIG. 7 is a section view of section C of FIG. 6 of a steel strip plastic-coated die in accordance with the present utility model;

FIG. 8 is a schematic view of a die body of a steel strip plastic-coated die according to the present utility model;

fig. 9 is a schematic structural view of a die of a steel strip plastic-coated die of the present utility model.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the present patent; for better illustration of the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product size; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship depicted in the drawings is for illustrative purposes only and is not to be construed as limiting the present patent.

The same or similar reference numerals in the drawings of the embodiments of the present utility model correspond to the same or similar components; in the description of the present utility model, it should be understood that, if there are orientations or positional relationships indicated by terms "upper", "lower", "left", "right", "long", "short", etc., based on the orientations or positional relationships shown in the drawings, this is merely for convenience in describing the present utility model and simplifying the description, and is not an indication or suggestion that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so that the terms describing the positional relationships in the drawings are merely for exemplary illustration and are not to be construed as limitations of the present patent, and that it is possible for those of ordinary skill in the art to understand the specific meaning of the terms described above according to specific circumstances.

The technical scheme of the utility model is further specifically described by the following specific embodiments with reference to the accompanying drawings:

Example 1

An embodiment 1 of a steel strip plastic-coated die is shown in fig. 1-5, and comprises a die body 1, a die body 1 cover 2, a die core and a die orifice 3, wherein the die body 1 cover 2, the die core and the die orifice 3 are fixedly connected with the die body 1, the die core is positioned in the die body 1, and the die body 1 cover 2 and the die orifice 3 are respectively positioned at a feeding end and a discharging end of the die body 1. The mold cores comprise a first mold core 4, a second mold core 5 and a third mold core 6, and a material channel 7 for a steel belt 14 to pass through sequentially passes through the mold body 1 cover 2, the first mold core 4, the second mold core 5, the third mold core 6, the mold body 1 and the die 3. The runner comprises a feeding runner 8, a guiding runner 9 and a flow dividing runner which are communicated in sequence, and the other end of the flow dividing runner is communicated with the material channel 7. The feeding flow passage 8, the guiding flow passage 9 and the flow dividing flow passage are symmetrically distributed by taking the material passage 7 as a symmetrical axis, namely, two sides of the material passage 7 are provided with die bodies 1 and die cores with the same structure, and the die bodies 1 and the die cores on two sides of the material passage 7 are symmetrically distributed by taking the material passage 7 as a symmetrical axis. The feeding runner 8 is positioned in the cover 2 of the die body 1, the guiding runner 9 is positioned between the die body 1 and the die cores, and the flow dividing runner comprises a first runner 10 positioned between the first die core 4 and the second die core 5, a second runner 11 positioned between the second die core 5 and the third die core 6 and a third runner 12 positioned between the third die core 6 and the die body 1.

The working principle or working process of the embodiment: the material flow flows into a guide runner 9 between the die body 1 and the die core from a feeding runner 8 on the die body 1 cover 2, flows into a diversion runner from the guide runner 9, and finally flows into a steel strip 14 in the material channel 7 from the diversion runner, so that the plastic coating of the steel strip 14 is completed. After the steel belt 14 enters the die, the steel belt advances along the material channel 7, firstly, the steel belt 14 passes through the first flow channel 10, the material flow in the first flow channel 10 enters the material channel 7 and is coated on the surface of the steel belt 14, the first plastic coating of the steel belt 14 is finished, then, the steel belt 14 passes through the second flow channel 11, the material flow in the second flow channel 11 is coated on the surface of the steel belt 14, the second plastic coating of the steel belt 14 is finished, finally, the steel belt 14 passes through the third flow channel 12, the material flow in the third flow channel 12 is coated on the surface of the steel belt 14, the third plastic coating of the steel belt 14 is finished, and the steel belt 14 after the third plastic coating is finished comes out of the material channel 7 on the die 3.

The beneficial effects of this embodiment are: in this scheme have three runner respectively to the steel band 14 plastic-coated in the steel band 14 plastic-coated mould, three runner can shunt the material flow of feeding runner 8, avoids the material flow impact force in the runner too big to lead to steel band 14 to be punched off tracking in material passageway 7, in addition, three runner forms three impact point to steel band 14, can also play the effect of rectifying to steel band 14.

Example 2

Example 2 of a steel strip plastic-coated die, as shown in fig. 1-7, the structure of the runner is further defined on the basis of example 1.

Specifically, the width of the discharge hole of the first flow channel 10 is greater than the width of the discharge hole of the second flow channel 11, and the width of the discharge hole of the second flow channel 11 is greater than the width of the discharge hole of the third flow channel 12.

Specifically, the discharge gate of feeding runner 8 is circular, is equipped with on the direction runner 9 to be used for with feeding runner 8 discharge gate intercommunication feeding portion 901, feeding portion 901 is the toper, the bore that keeps away from feeding runner 8 one end on the toper feeding portion 901 is less than the bore that is close to feeding runner 8 one end. The discharge gate of feeding runner 8 has three, and the discharge gate of three feeding runner 8 is the linear equidistance and arranges on die body 1 lid 2, and feeding portion 901 has three, and every feeding portion 901 all communicates with the discharge gate of a feeding runner 8.

Specifically, the first flow channel 10 is conical, and the width of the feed inlet of the first flow channel 10 is larger than the width of the discharge outlet of the first flow channel 10; the second flow channel 11 is conical, and the width of a material inlet of the second flow channel 11 is larger than that of a material outlet of the second flow channel 11; the third flow channel 12 is conical, and the width of the feed inlet of the third flow channel 12 is larger than the width of the discharge outlet of the third flow channel 12.

Specifically, the first flow channel 10, the second flow channel 11 and the third flow channel 12 are parallel, and an included angle formed by the first flow channel 10 and the material channel 7 is 35 degrees.

Specifically, the chamfer for guiding the material flow is arranged at one end of the second mold core 5, which is positioned at the feeding hole of the second flow channel 11, one end of the second mold core 5, which is positioned at the discharging hole of the first flow channel 10, one end of the third mold core 6, which is positioned at the discharging hole of the third flow channel 11, one end of the mold body 1, which is positioned at the discharging hole of the third flow channel 12, and one end of the mold body 1, which is positioned at the feeding hole of the third flow channel 12.

The beneficial effects of this embodiment are: the width of the discharge openings of the first 10, second 11 and third 12 channels decreases stepwise so that the thickness of the coated steel strip 14 as it passes through the first 10, second 11 and third 12 channels decreases stepwise. The first plastic coating provided by the first flow channel 10 of the steel strip 14 can be covered by the second plastic coating provided by the second flow channel 11 after the appearance defect is generated by cooling shrinkage, and the appearance defect generated by the second plastic coating provided by the second flow channel 11 during cooling shrinkage can be covered by the third plastic coating provided by the third flow channel 12, so that the probability of appearance defect on the surface of the steel strip 14 can be further reduced, and the surface of the steel strip 14 after finishing plastic coating can be ensured to be attractive.

The discharge opening of the feed channel 8 is circular, so that the material flow can quickly pass through the feed channel 8 and enter the guide channel 9. The conical feed 901 better guides and diverts the flow so that it can quickly fill the guide channel 9. The feed inlet has three, can accelerate the velocity that the material flows into in the mould for the material flows can more even quick entering into in the mould.

The tapered first flow channel 10, second flow channel 11 and third flow channel 12 can increase the pressure when the material flows out, so that the material flows can be more fully attached to the steel strip 14, and the plastic coating effect of the steel strip 14 is better. The first flow channel 10, the second flow channel 11 and the third flow channel 12 are parallel, that is, the angles of the flows flowing out of the three flow channels are the same, the angles of the flows flowing out of the three flow channels are consistent when the flows are in contact with the steel strip 14, the covering effect is better, and the plastic coating effect of the steel strip 14 is better. Through the research surface, when the angle range of the included angle formed by the first runner 10 and the material channel 7 is within 35 degrees, the plastic coating effect on the steel belt 14 is better. The second mold core 5, the third mold core 6 and the mold body 1 are provided with chamfers, so that a better guiding effect can be achieved on the material flow, the material flow can smoothly flow into the diversion flow passage from the guiding flow passage 9, and the material flow can smoothly flow onto the steel belt 14 from the diversion flow passage.

Example 3

Example 3 of a steel strip plastic-coated die, as shown in fig. 1-4, the structure of the die is further defined on the basis of example 1 or example 2.

Specifically, the die further comprises two connecting plates 13, wherein the two connecting plates 13 are respectively positioned at two sides of the die body 1 and fixedly connected with the die body 1, and two ends of the die body 1 cover 2 are respectively and fixedly connected with the two connecting plates 13. The die body 1 is provided with a groove 201 on the cover 2, the die body 1 is provided with a protrusion 101, and the protrusion 101 is positioned in the groove 201 and is attached to the groove 201.

Specifically, the die 3 is provided with a material passing opening 301 through which the steel strip 14 passes, the material channel 7 on the die 3 is the material passing opening 301, and the width and the height of the material passing opening 301 are the same as the width and the height of the steel strip 14 after plastic coating. The die 3 is connected with the die body 1 through bolts, the die 3 is provided with a straight slot 302, and the bolts penetrate through the straight slot 302 to be connected with the die body 1.

The beneficial effects of this embodiment are: the arrangement of the connecting plate 13 can further install and fix the two die bodies 1 and the cover 2 of one die body 1, so that the overall connecting strength of the die is improved. The arrangement of the protrusions 101 and the grooves 201 can facilitate positioning of the mold body 1 and the mold body 1 cover 2 when the mold body 1 and the mold body 1 cover 2 are assembled, and facilitate installation. The material passing opening 301 on the die 3 not only can prevent the steel belt 14 from deviating in the die, but also can limit the plastic coating thickness of the steel belt 14. The arrangement of the straight slot 302 can finely adjust the installation position of the die 3 on the die body 1, and further prevent the steel belt 14 from deviating.

It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The utility model provides a steel band plastic-coated mould, its characterized in that includes die body (1) and all with die body (1) lid (2), mold core and bush (3) of die body (1) fixed connection, the mold core is located in die body (1), die body (1) lid (2) with bush (3) are located respectively feed end and discharge end of die body (1), the mold core includes first mold core (4), second mold core (5) and third mold core (6), is used for material passageway (7) that steel band (14) passed pass in proper order die body (1) lid (2), first mold core (4), second mold core (5) third mold core (6) die body (1) and bush (3),

The flow channel comprises a feeding flow channel (8), a guiding flow channel (9) and a flow dividing flow channel which are sequentially communicated, the other end of the flow dividing flow channel is communicated with the material channel (7), the feeding flow channel (8), the guiding flow channel (9) and the flow dividing flow channel are symmetrically distributed by taking the material channel (7) as a symmetrical axis,

The feeding runner (8) is located in the die body (1) cover (2), the guiding runner (9) is located between the die body (1) and the die cores, and the flow dividing runner comprises a first runner (10) located between the first die cores (4) and the second die cores (5), a second runner (11) located between the second die cores (5) and the third die cores (6) and a third runner (12) located between the third die cores (6) and the die body (1).

2. The steel strip plastic-coated die of claim 1, wherein the width of the discharge port of the first runner (10) is larger than the width of the discharge port of the second runner (11), and the width of the discharge port of the second runner (11) is larger than the width of the discharge port of the third runner (12).

3. The steel strip plastic-coated die as claimed in claim 1, wherein the discharge hole of the feed runner (8) is circular, the guide runner (9) is provided with a feed portion (901) for communicating with the discharge hole of the feed runner (8), the feed portion (901) is tapered, the caliber of the end of the tapered feed portion (901) away from the feed runner (8) is smaller than the caliber of the end close to the feed runner (8),

The utility model discloses a feeding runner, including die body (1) cover (2), feed runner (8) and die body, feed runner (901) have the discharge gate of a plurality of, a plurality of feed runner (8) the discharge gate is in be linear equidistance on die body (1) cover (2), feed portion (901) have a plurality of, every feed portion (901) all with one feed runner (8) discharge gate intercommunication.

4. The steel strip plastic-coated die as claimed in claim 1, wherein the first runner (10) is tapered, and the width of the feed inlet of the first runner (10) is larger than the width of the discharge outlet of the first runner (10); the second flow channel (11) is conical, and the width of a material inlet of the second flow channel (11) is larger than that of a material outlet of the second flow channel (11); the third flow passage (12) is conical, and the width of a material inlet of the third flow passage (12) is larger than the width of a material outlet of the third flow passage (12).

5. The steel strip plastic-coated die as claimed in claim 4, wherein the first runner (10), the second runner (11) and the third runner (12) are parallel, and an included angle between the first runner (10) and the material channel (7) is 15 ° -65 °.

6. The steel strip plastic-coated die as claimed in claim 1, wherein one end of the second die core (5) located at the feed inlet of the second runner (11), one end of the second die core (5) located at the feed inlet of the first runner (10), one end of the third die core (6) located at the feed inlet of the third runner (12), one end of the third die core (6) located at the feed inlet of the second runner (11), one end of the die body (1) located at the feed inlet of the third runner (12) and one end of the die body (1) located at the feed inlet of the third runner (12) are provided with chamfers for guiding a material flow.

7. The steel strip plastic-coated die as claimed in claim 1, further comprising two connecting plates (13), wherein the two connecting plates (13) are respectively located at two sides of the die body (1) and fixedly connected with the die body (1), and two ends of the die body (1) cover (2) are respectively fixedly connected with the two connecting plates (13).

8. The steel strip plastic-coated die according to claim 1, wherein a groove (201) is formed in the cover (2) of the die body (1), a protrusion (101) is formed in the die body (1), and the protrusion (101) is located in the groove (201) and is attached to the groove (201).

9. The steel strip plastic-coated die according to claim 1, wherein a material passing opening (301) through which the steel strip (14) passes is formed in the die (3), the material passage (7) in the die (3) is the material passing opening (301), and the width and the height of the material passing opening (301) are the same as those of the plastic-coated steel strip (14).

10. The steel strip plastic-coated die as claimed in claim 9, wherein the die (3) is connected with the die body (1) by bolts, the die (3) is provided with a straight slot hole (302), and the bolts pass through the straight slot hole (302) to be connected with the die body (1).