CN111619289A - Parcel type PU dual density tire - Google Patents
Parcel type PU dual density tire Download PDFInfo
- Publication number
- CN111619289A CN111619289A CN202010498659.XA CN202010498659A CN111619289A CN 111619289 A CN111619289 A CN 111619289A CN 202010498659 A CN202010498659 A CN 202010498659A CN 111619289 A CN111619289 A CN 111619289A
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- Prior art keywords
- tire
- density
- wrapped
- dual
- mixture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C7/00—Non-inflatable or solid tyres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/08—Building tyres
Abstract
A wrapped PU dual-density tire comprises an outer tire and a tire body; the density of the outer tire is greater than that of the tire body, and the outer tire is wrapped outside the tire body. The thickness of the outer tire can be adjusted according to requirements instead of being fixed, and meanwhile, the overall tear resistance and scratch resistance of the tire are improved, so that the overall service life of the tire is prolonged; the integral supporting force of the tire is improved, and the load-carrying capacity of the foamed tire is further improved; the deformation resistance of the tire is improved, and particularly, the deformation amplitude is greatly reduced when the tire is not moved under static pressure.
Description
Technical Field
The invention relates to the field of tires, in particular to a wrapped PU dual-density tire.
Background
The use of PU foam for manufacturing tires is a well-established technology, and is generally designed by selecting foam materials with different densities according to different requirements. The conventional foamed PU tire is mainly used for a wheelchair and a baby carriage, and these vehicles have low requirements for abrasion resistance and speed. The PU foaming tire has the greatest characteristic that the comfort performance is superior to that of other non-pneumatic tires, and meanwhile, the manufacturing process is simple and the cost is low. However, after the PU material is foamed, the compression resistance and the wear resistance are reduced. At higher loads and higher speeds (at 15km per hour), the problems of heartburn and poor wear resistance occur. In addition, if the PU tire is pressed at a certain position under a heavy load for a long time, a phenomenon of local collapse occurs, namely, once foaming, the resilience performance is greatly reduced. For example, when an electric vehicle is mounted with a PU foam tire and left alone for a while, the tire tread pressed against the ground tends to collapse. Therefore, the PU foam tire is only applied to vehicles with low speed and low load at present.
With the development of technology, many new technologies appeared in PU tires. Common PU non-pneumatic tires are divided into single density foamed tires and double density foamed tires.
The PU single-density foamed tire (shown in figure 8) has the same foaming density of the whole tire, the tire has good comfort performance but is not wear-resistant, and meanwhile, the contact part between the tire and the ground and two side surfaces of the tire are easy to damage and fall off. At present, enterprises using the tire in a shared bicycle are more, the phenomenon that blocks fall off from the crown part and the sidewall surface of the tire is more through statistics of the recycled tire, and the main problems are that the tear strength of the material is greatly reduced after foaming, and a small block easily falls off when the tire is scratched or hit by small stones.
The PU dual-density tire (shown in figure 9) is divided into a crown part and a tire body part, a high-density material (micro-foaming or non-foaming) is used at the crown part (the contact surface with the ground), the wear resistance of the PU tire is greatly improved, and the tire body part still adopts a foaming material which is the same as that of the traditional single-density tire. The tire structure is comfortable and wear-resistant. But the two sides of the tire still have the phenomenon of being impacted and falling off (the whole block falls off). Compared with a single-density foaming tire, the tire has the advantages that the wear resistance of the tire is improved, and the maintenance rate of the tire is reduced.
Although the dual density tire has been made good for comfort and wear resistance, in practical applications, it cannot be used on vehicles with higher speed and higher load, such as electric vehicles, compared with shared bicycles, for the following reasons:
a: the side is made of foamed material, the supporting force is not enough, the compression of the tire is large, and the endurance mileage of the vehicle is greatly reduced. If the supporting force is improved, the foaming density can be improved, but the comfort performance of the tire is greatly reduced.
B: the phenomenon that blocks fall off from the side face of the shared bicycle can occur on the electric bicycle, and because the speed is high, the load is relatively large, the phenomenon that the blocks fall off can be more serious, the service life of the tire is shorter, the cost performance of the inflation-free tire is reduced, and a customer can not select the tire.
The tyre body part of the tyre is a foaming body, and the two side surfaces are only a layer of crusts generated in the foaming process, the crusts are naturally generated when the PU material touches a mould in the molding process, and the thickness of the crusts is naturally generated. If the side of the tire is also provided with a slightly foamed or unfoamed protective layer which is thicker like a crown, the tire cannot be scratched easily, and the service life of the tire is prolonged. In addition, if the side surface of the tire is provided with a thicker protective layer, namely a full-wrapping type tire, the supporting force of the tire is greatly enhanced, so that the pressure resistance of the tire is greatly improved, the tire can realize larger load-carrying load, and the phenomenon that the tire is flattened due to long-term non-use due to the support is also improved. The deformation of the tire under load is small, so that the tire is easy to ride, the endurance mileage of the electric vehicle is increased, and the index is particularly important for the electric vehicle.
In order to solve the above problems, a wrapped type PU dual density tire is provided in the present application.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides a wrapped PU double-density tire, the density of an outer tire body of the wrapped PU double-density tire is greater than that of an inner tire body, and the wrapped PU double-density tire is completely wrapped outside the tire body, and most importantly, the thickness of the wrapping can be adjusted according to requirements. The tire is different from the common dual-density tire, only the crown part is high-density, but the sidewall part is not. The invention improves the overall tear resistance and scratch resistance of the tire, thereby prolonging the overall service life of the tire; the integral supporting force of the tire is improved, and the load-carrying capacity of the foamed tire is further improved; the deformation resistance of the tire is improved, and particularly, the deformation amplitude is greatly reduced when the tire is not moved under static pressure.
(II) technical scheme
In order to solve the problems, the invention provides a wrapped PU dual-density tire, which comprises an outer tire and a tire body; the density of the outer tire is greater than that of the tire body, and the outer tire is wrapped outside the tire body. The thickness of the outer tire can be adjusted according to requirements, but is not fixed and constant.
Preferably, the outer tire is C-shaped or U-shaped.
Preferably, the first manufacturing step of the wrapped PU dual-density tire is as follows:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the die, and starting the centrifuge;
s5, adding the A1B mixed material into a mold, centrifuging by a centrifuge in the process of pouring, and turning over the mixed material within 180 degrees along a bottom plate by taking a supporting rod at the bottom as a circle center to form an outer tire;
s6, after the outer tire is molded, continuously rotating for 8-15S and then reducing the speed of the centrifuge;
s7, injecting the A2B mixture into the mold, rotating for 40-60S, and then stopping the centrifuge to form a tire body;
and S8, wrapping and molding the tire body by the outer tire, and finishing the rubber injection process.
Preferably, in S5 of the first step, the flipping step is: a. the mould is positioned at a vertical starting position; b. the mould is turned 90 degrees towards one side; c. the mould is turned 180 degrees towards the other side; d. and (5) resetting the mould.
Preferably, in step one, S5, the inversion is synchronized with the pouring time of the A1B mixed material.
Preferably, the inversion in step one is one or more.
Preferably, the manufacturing steps of the wrapped PU dual-density tire are as follows:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the mould;
s5, spraying the A1B mixed material onto the inner wall of the mould by a spray head to form an outer tyre;
s6, standing for 8-15S after the outer tire is molded, and carrying out the next step;
s7, injecting an A2B mixture into the mold to form a tire body;
and S8, wrapping and molding the tire body by the outer tire, and finishing the rubber injection process.
Preferably, the A1B mixed material in the first step and the second step is non-foaming or micro-foaming material, and the density is more than 0.9g/cm3。
Preferably, the A2B mixed material in the first step and the second step is a foaming material with the density of 0.3g/cm3-0.9g/cm3。
The technical scheme of the invention has the following beneficial technical effects:
firstly, the thickness of the outer tire can be adjusted according to requirements, but is not fixed.
The invention improves the overall tear resistance and scratch resistance of the tire, thereby prolonging the overall service life of the tire.
Thirdly, the invention improves the integral supporting force of the tire, thereby improving the load-carrying capacity of the foamed tire.
The invention improves the deformation resistance of the tire, and particularly greatly reduces the deformation amplitude when the tire is not moved under static pressure.
Drawings
FIG. 1 is a cross-sectional view showing a first structure of a wrapped type PU dual density tire according to the present invention.
FIG. 2 is a partially enlarged cross-sectional view of a first structure of a wrapped type PU dual density tire according to the present invention.
FIG. 3 is a cross-sectional view showing a second structure of a wrapped type PU dual density tire according to the present invention.
FIG. 4 is a partial enlarged sectional view showing a second structure of a wrapping type PU dual density tire according to the present invention.
Fig. 5 is a schematic diagram of step a in the process of turning over the mold in the wrapped PU dual-density tire according to the present invention.
Fig. 6 is a schematic diagram of step b in the process of turning over the mold in the wrapped PU dual-density tire according to the present invention.
Fig. 7 is a schematic diagram of step c in the process of turning over the mold in the wrapped PU dual-density tire according to the present invention.
Fig. 8 is a cross-sectional view of a PU single density foamed tire of the prior art.
Fig. 9 is a sectional view of a PU dual density foamed tire of the prior art.
The attached drawings are marked as follows: 1. a base plate; 2. a support bar; 3. a centrifuge; 4. a mold; 5. a carcass; 6. an outer tire.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-7, the invention provides a wrapped PU dual-density tire, which comprises an outer tire 6 and a tire body 5; the density of the outer tire 6 is larger than that of the tire body 5, and the outer tire 6 is wrapped outside the tire body 5. The thickness of the outer tyre (6) can be adjusted according to requirements, but is not fixed.
In an alternative embodiment, the outer tire 6 is C-shaped or U-shaped.
In an alternative embodiment, the above wrapped PU dual density tire is produced by the following steps:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the mold 4, and starting the centrifuge 3;
s5, adding the A1B mixed material into a mold 4, and turning over the mixed material along a bottom plate 1 within 180 degrees by taking a support rod 2 at the bottom as a circle center while centrifuging by a centrifuge 3 in the pouring process to form an outer tire 6; in the process, the forming thickness and height (C shape or U shape) of the outer tire 6 can be controlled by controlling the unit time injection amount of the A1B mixed material;
s6, after the outer tire 6 is molded, continuing rotating for 8-15S, and reducing the speed of the centrifuge 3; the outer tire 6 cannot be molded for too long, so that the outer tire is prevented from being dispersed by the A2B foam material poured behind, and the rubber outlet of the machine is blocked to influence the following procedures if the molding time is too long;
s7, injecting the A2B mixture into the mold 4, turning for 40-60S, and then stopping the centrifuge 3 to form a tire body 5;
and S8, wrapping the tyre body 5 by the outer tyre 6 for molding, and finishing the glue injection process.
In an alternative embodiment, in S5, the flipping step is: a. the mould 4 is in a vertical starting position; b. the mould 4 is turned 90 degrees towards one side; c. the mould 4 is turned 180 degrees towards the other side; d. the mould 4 is reset.
In an alternative embodiment, in S5, the turning is synchronized with the pouring time of the A1B mix, and the turning and pouring time of the A1B mix are extended when the casing 6 is thickened.
In an alternative embodiment, the flipping is one or more times.
In an alternative embodiment, the above wrapped PU dual density tire is prepared by the following steps:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the mold 4;
s5, spraying the A1B mixed material onto the inner wall of the mould 4 by adopting a spray head to form an outer tyre 6;
s6, standing for 8-15S after the outer tire 6 is molded, and carrying out the next step;
s7, injecting an A2B mixture into the mold 4 to form a tire body 5;
and S8, wrapping the tyre body 5 by the outer tyre 6 for molding, and finishing the glue injection process.
In an alternative embodiment, the A1B blend in step one and step two is a non-foamed or micro-foamed material having a density greater than 0.9g/cm3。
In an alternative embodiment, the A2B blend in step one and step two is a foam having a density of 0.3g/cm3-0.9g/cm3。
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (9)
1. A wrapped PU dual-density tire is characterized by comprising an outer tire (6) and a tire body (5); the density of the outer tire (6) is greater than that of the tire body (5), and the outer tire (6) is wrapped outside the tire body (5).
2. The wrapped PU dual density tire according to claim 1, wherein the outer tire (6) is C-shaped or U-shaped.
3. The wrapped PU dual density tire according to claim 1, wherein the first manufacturing step is as follows:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the die (4), and starting the centrifuge (3);
s5, adding the A1B mixed material into a mold (4), and turning over the mixed material along a bottom plate (1) within 180 degrees by taking a support rod (2) at the bottom as a circle center while centrifuging a centrifuge (3) in the pouring process to form an outer tire (6);
s6, after the outer tire (6) is formed, the centrifuge returns to the position of figure 5, and the centrifuge is still for 8S-15S to carry out the next step
S7, injecting an A2B mixture into the mold (4), turning for 40-60S, and then stopping the centrifuge (3) to form a tire body (5);
s8, wrapping and molding the tire body (5) by the outer tire (6), and finishing the rubber injection process.
4. The wrapped PU dual density tire according to claim 3, wherein in S5, the turning step is: a. the mould (4) is located at a vertical starting position; b. the mould (4) is turned 90 degrees towards one side; c. the mould (4) is turned 180 degrees towards the other side; d. and resetting the mould (4).
5. The dual density PU tire according to claim 3, wherein the inversion is synchronized with the pouring time of the A1B mixture at S5.
6. The dual-density PU tire of wrapped type according to claim 3, wherein the number of times of turning is not required if the thickness of the carcass (6) is not required.
7. The wrapped PU dual density tire according to claim 1, wherein the second manufacturing step is as follows:
s1, respectively mixing and uniformly stirring a tire production raw material A1 material, a2 material and a B material for later use;
s2, setting the discharge amounts of the A1 material, the A2 material and the B material according to production requirements;
s3, mixing and stirring the material A1 and the material B, and the material A2 and the material B according to the proportion to obtain a mixture A1B and a mixture A2B;
s4, locking the mold (4);
s5, spraying the A1B mixed material onto the inner wall of the mould (4) by adopting a spray head to form an outer tyre (6);
s6, standing for 8-15S after the outer tire (6) is formed, and carrying out the next step;
s7, injecting the A2B mixed material into the mold (4) to form a tire body (5);
s8, wrapping and molding the tire body (5) by the outer tire (6), and finishing the rubber injection process.
8. The wrapped PU dual density tire according to any one of claims 3 and 7, wherein the A1B hybrid material is non-foamed or micro-foamed material, and the density is more than 0.9g/cm3。
9. The wrapped PU dual density tire according to any one of claims 3 and 7, wherein the A2B hybrid material is a foamed material having a density of 0.3g/cm3-0.9g/cm3。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010498659.XA CN111619289A (en) | 2020-06-04 | 2020-06-04 | Parcel type PU dual density tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010498659.XA CN111619289A (en) | 2020-06-04 | 2020-06-04 | Parcel type PU dual density tire |
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| Publication Number | Publication Date |
|---|---|
| CN111619289A true CN111619289A (en) | 2020-09-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010498659.XA Pending CN111619289A (en) | 2020-06-04 | 2020-06-04 | Parcel type PU dual density tire |
Country Status (1)
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| CN (1) | CN111619289A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116728715A (en) * | 2023-08-14 | 2023-09-12 | 季华合越科技(佛山)有限公司 | Solid tire forming equipment and solid tire forming method |
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Application publication date: 20200904 |
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| RJ01 | Rejection of invention patent application after publication |