Centrifugal machine circulation production system of polyurethane tire production line

Abstract

The invention discloses a centrifugal machine circulation production system of a polyurethane tire production line, which comprises a closed circulation track, a plurality of centrifugal machines mounted on the circulation track, a circulation power device capable of driving the centrifugal machines to move along the circulation track, and an oven, the oven comprises an oven body fixed relative to the circulating track and a heating device arranged in the oven body, and the centrifugal machine comprises a trolley, a rotating disc rotationally arranged on the trolley, a centrifugal mold installed on the rotating disc and a centrifugal driver capable of driving the rotating disc and the centrifugal mold to rotate together. The box body is provided with a baking cavity, a baking inlet and a baking outlet, the baking inlet and the baking outlet are communicated with the baking cavity, and when the trolley moves along the circulating track, the centrifugal mold on the trolley can sequentially pass through the baking inlet, the baking cavity and the baking outlet. The number of the centrifugal machines in the system is not limited by the working area of the polyurethane foaming filling machine, and the mold of the polyurethane tire can be heated through the oven.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane tire production, in particular to a centrifuge circulation production system for a polyurethane tire production line. Background Art

[0002] Polyurethane tires are wheels made of foamed plastics through injection molding, and have the characteristics of stable size, low shrinkage, stable chemical composition, anti-corrosion and anti-aging, good wear resistance, etc. Foam wheels made of foamed plastics are light, material-saving, and can absorb impact loads due to the presence of internal bubbles. Therefore, foam wheels have a wide range of applications, especially in various transportation equipment and other fields.

[0003] The polyurethane foaming injection machine is a special equipment for polyurethane injection foaming, which is often used in the production of foam wheels. Generally, polyether polyol and polyisocyanate are used as the A and B component stock solutions. After precise proportioning and high-speed stirring, the A and B component liquids are respectively transported to the stirring head. After high-speed and strong stirring, the liquid is evenly injected into the mold on the centrifuge, and then the mold is centrifugally rotated to make the desired product.

[0004] The traditional polyurethane foaming and filling machine uses a crane to transport the liquid to the centrifuge, and the operator needs to shuttle back and forth between the two sides for filling production. Due to the limited radius of the crane, the number of centrifuges installed can only be about 20. This method produces a small number of molds and a low daily output. In addition, in this process, the area above the mold cannot be installed with an oven. Because the upper area needs to use the crane to fill the raw materials, only the heating tube can be installed at the bottom of the mold, resulting in the temperature of the upper mold cannot be heated. The heat must be transferred to the upper mold through the temperature of the lower mold, which will cause the lower film temperature to be too high and the upper film temperature to be low, resulting in inconsistent temperatures of the upper and lower molds, resulting in inconsistent color and hardness of the products produced by the upper and lower molds. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a centrifuge circulation production system for a polyurethane tire production line, in which the number of centrifuges is not limited by the working area of ​​the polyurethane foaming and filling machine, and the mold of the polyurethane tire can be heated by an oven.

[0006] The technical solution adopted by the present invention to solve the technical problem is:

[0007] A centrifuge circulation production system for a polyurethane tire production line comprises a closed circulation track, a plurality of centrifuges installed on the circulation track, a circulation power device capable of driving the centrifuges to move along the circulation track, and an oven, wherein the oven comprises a box body fixed relative to the circulation track and a heating device arranged in the box body, the centrifuge comprises a trolley, a turntable rotatably arranged on the trolley, a centrifugal mold installed on the turntable, and a centrifugal driver capable of driving the turntable and the centrifugal mold to rotate together, the box body comprises a baking cavity, a baking inlet and a baking outlet communicated with the baking cavity, and when the trolley moves along the circulation track, the centrifugal mold on the trolley can sequentially pass through the baking inlet, the baking cavity and the baking outlet.

[0008] In a preferred embodiment of the present invention, the heating device is higher than the centrifugal mold, and the box body is provided with a fan capable of generating airflow in the baking cavity.

[0009] In a preferred embodiment of the present invention, the fan includes a main shaft rotatably arranged on the top wall of the box body, an impeller installed on the main shaft and capable of blowing air downward, and a blower motor installed on the box body and capable of driving the main shaft and the impeller to rotate together, and the impeller is located inside the baking chamber and higher than the centrifugal mold on the trolley.

[0010] In a preferred embodiment of the present invention, the heating device comprises a plurality of heating tubes fixed on the inner surface of the top of the box body.

[0011] In a preferred embodiment of the present invention, a fixed bracket is provided on one side of the circulating track, a cross bar is provided on the top of the fixed bracket, and the box is hoisted on the cross bar so that the box is located above the circulating track.

[0012] In a preferred embodiment of the present invention, the circulating track is in an oblong shape, the circulating power device includes a first sprocket, a second sprocket, a main chain connected between the first sprocket and the second sprocket, and a circulating motor capable of driving the first sprocket and the second sprocket to rotate, the trolley includes a frame and a plurality of wheel assemblies arranged at the bottom of the frame, and a movable connecting structure connecting the trolley and the chain is provided between the two.

[0013] In a preferred embodiment of the present invention, a first fixed seat and a second fixed seat separated from each other are fixed on one side of the frame, and the movable connection structure includes a first connecting member hinged to the first fixed seat, a rotating arm hinged to the second fixed seat, and a second connecting member hinged to the rotating arm, and the first connecting member and the second connecting member are respectively connected to a link of the main chain.

[0014] In a preferred embodiment of the present invention, a table panel is fixed on the frame, a bearing seat is fixed on the table panel, a rotating shaft inserted into the bearing seat is fixed on the turntable, a bearing is set between the bearing seat and the rotating shaft, and the centrifugal drive includes a motor mounted on the table panel, and the output shaft of the motor is connected to the rotating shaft.

[0015] In a preferred embodiment of the present invention, the centrifugal mold comprises a lower mold and an upper mold, the upper surface of the lower mold is provided with a first annular groove, the lower surface of the upper mold is provided with a second annular groove corresponding to the first annular groove, a mold cavity is formed between the first annular groove and the second annular groove, an injection hole is provided in the middle of the upper mold, the lower surface of the upper mold has a transition surface located between the injection hole and the second annular groove, and a feeding gap is formed between the transition surface and the lower mold.

[0016] In a preferred embodiment of the present invention, a burr gap is provided between the upper die and the lower die, surrounding the outer side of the die cavity and communicating with the die cavity.

[0017] The beneficial effects of the present invention are:

[0018] 1. With this setting, the number of centrifuges in the entire production line is no longer limited by the working radius of the polyurethane foaming and injection machine. Users can increase the number of centrifuges in the entire production line according to actual conditions, which is conducive to improving production efficiency.

[0019] 2. Use an oven to heat and solidify the material in the centrifugal mold so that the centrifugal mold can be heated evenly, which is beneficial to improving the quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a top view schematic diagram of the present invention;

[0021] Figure 2 yes Figure 1 A magnified view of part B;

[0022] Figure 3 It is a schematic diagram of the connection structure between the centrifuge and the main chain;

[0023] Figure 4 yes Figure 1 Sectional view at the AA line;

[0024] Figure 5 It is a schematic diagram of the positional relationship between a centrifuge and a circulating track;

[0025] Figure 6 It is a three-dimensional diagram of a centrifuge;

[0026] Figure 7 is a cross-sectional view of a centrifugal die;

[0027] Figure 8 yes Figure 7 Magnified view of part C. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0029] It should be noted that all directional indications in the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the descriptions of "preferred", "sub-preferred", etc. in the present invention are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "preferred" or "sub-preferred" may explicitly or implicitly include at least one such feature.

[0030] Reference Figures 1 to 8 The present invention proposes a centrifuge circulation production system for a polyurethane tire production line, comprising a closed circulation track 1, a plurality of centrifuges installed on the circulation track 1, a circulation power device capable of driving the centrifuges to move along the circulation track 1, and an oven 2, wherein the oven 2 comprises a box body 21 fixed relative to the circulation track 1, and a heating device arranged in the box body 21, the centrifuge comprises a trolley 800, a turntable 31 rotatably arranged on the trolley 800, a centrifugal mold 4 installed on the turntable 31, and a centrifugal driver 32 capable of driving the turntable 31 and the centrifugal mold 4 to rotate together, the box body 21 has a baking cavity 210, a baking inlet and a baking outlet communicated with the baking cavity 210, and when the trolley 800 moves along the circulation track 1, the centrifugal mold 4 on the trolley 800 can pass through the baking inlet, the baking cavity 210 and the baking outlet in sequence.

[0031] Preferably, the circulating track 1 is in an oblong shape, the circulating power device includes a first sprocket 71, a second sprocket 72, a main chain 73 connected between the first sprocket 71 and the second sprocket 72, and a circulating motor capable of driving the first sprocket 71 and the second sprocket 72 to rotate, the trolley 800 includes a frame 801 and a plurality of wheel assemblies 802 arranged at the bottom of the frame 801, and a movable connecting structure connecting the trolley 800 and the chain is provided between the two.

[0032] This centrifuge circulation production system adopts such a structural form, so that the centrifuge is easy to be pulled by the main chain 73 and moves along the oblong circular circulation track 1. An oven 2 is set on the left side of this circulation track 1, and a polyurethane foaming and pouring machine can be set on the right side of this circulation track 1. When the centrifuge moves to the working area of ​​the polyurethane foaming and pouring machine, the foamed raw material can be poured into the centrifugal mold 4 of the centrifuge. After the pouring is completed, the centrifugal mold 4 is closed, and then the centrifugal driver 32 can drive the centrifugal mold 4 to rotate, so as to mold the polyurethane tire blank in the centrifugal mold 4. When the rotating centrifugal mold 4 moves into the baking chamber 210 of the oven 2 along with the centrifuge, the foaming raw material inside is slowly solidified, and after the centrifuge leaves the working area of ​​the oven 2, the staff can open the centrifugal mold 4 and take out the polyurethane tire blank therein. Then when the centrifuge moves to the working area of ​​the polyurethane foaming and pouring machine again, the next round of operation is carried out. Compared with the prior art, such a setting means that the number of centrifuges in the entire production line is no longer limited by the working radius of the polyurethane foaming and filling machine. Users can increase the number of centrifuges in the entire production line according to actual conditions, which is conducive to improving production efficiency.

[0033] Preferably, the heating device includes a plurality of heating tubes 60 fixed on the inner surface of the top of the box body 21 .

[0034] Furthermore, the heating device is higher than the centrifugal mold 4, and a fan capable of generating airflow in the baking chamber 210 is provided on the box body 21. The fan includes a main shaft 51 rotatably provided on the top wall of the box body 21, an impeller 52 installed on the main shaft 51 and capable of blowing air downward, and a blower motor 53 installed on the box body 21 and capable of driving the main shaft 51 and the impeller 52 to rotate together. The impeller 52 is located inside the baking chamber 210 and higher than the centrifugal mold 4 on the trolley 800. With such a design, the hot air in the baking chamber 210 can flow downward and heat the centrifugal mold 4, which can improve the heating efficiency, and the presence of the fan can fully mix the hot air and cold air in the baking chamber 210, further improving the temperature uniformity in the baking chamber 210.

[0035] Reference Figure 4 A fixed bracket 61 is provided on one side of the circulating track 1, a cross bar 62 is provided on the top of the fixed bracket 61, a suspension rod 63 is provided on the cross bar 62, and the lower end of the suspension rod 63 is connected to the box 21 so that the box 21 is suspended on the cross bar 62, so that the box 21 is located above the circulating track 1.

[0036] In a preferred embodiment of the present invention, a first fixed seat 81 and a second fixed seat 82 separated from each other are fixed on one side of the frame 801, and the movable connection structure includes a first connecting member 83 hinged to the first fixed seat 81, a rotating arm 84 hinged to the second fixed seat 82, and a second connecting member 85 hinged to the rotating arm 84, and the first connecting member 83 and the second connecting member 85 are respectively connected to a link of the main chain 73.

[0037] The frame 801 includes a bottom frame 86, the first fixing seat 81 and the second fixing seat 82 are fixed on the same side of the bottom frame 86, and all the wheel assemblies 802 are installed on the lower surface of the bottom frame 86. The wheel assembly 802 is a universal wheel assembly. The wheel assembly 8022 is a universal wheel assembly, and the structure of the universal wheel assembly, the impeller 52, the blower motor 53, and the heating pipe 60 is an existing mature technology and can be purchased on the market.

[0038] Reference Figure 4 A table panel 87 is fixed on the frame 801, a bearing seat is fixed on the table panel 87, a rotating shaft inserted into the bearing seat is fixed on the turntable 31, a bearing is set between the bearing seat and the rotating shaft, and the centrifugal drive 32 includes a motor installed on the table panel 87, and the output shaft of the motor is connected to the rotating shaft.

[0039] Reference Figure 7 and Figure 8 The centrifugal mold 4 includes a lower mold 41 and an upper mold 42. The lower mold 41 is fixed on the turntable 31 by screws. The upper mold 42 is openable. The upper surface of the lower mold 41 is provided with a first annular groove 411. The lower surface of the upper mold 42 is provided with a second annular groove 421 corresponding to the first annular groove 411. A mold cavity 43 is formed between the first annular groove 411 and the second annular groove 421. A material injection hole 422 is provided in the middle of the upper mold 42. The lower surface of the upper mold 42 has a transition surface 4201 located between the material injection hole 422 and the second annular groove 421. A feeding gap 44 is formed between the transition surface 4201 and the lower mold 41. A burr gap 45 surrounding the outer side of the mold cavity 43 and communicating with the mold cavity 43 is also provided between the upper mold 42 and the lower mold 41.

[0040] Preferably, the width of the burr gap 45 is smaller than the width of the feed gap 44, and the width of the burr gap 45 is 0.1-0.8 mm, such as 0.15 mm, 0.3 mm, 0.5 mm, 0.7 mm, etc., and the width of the feed gap 44 is 0.8-3 mm, such as 0.8 mm, 1.3 mm, 2 mm, 2.5 mm, etc.

[0041] The injection hole 422 is generally a circular hole for pouring polyurethane foam material. When the centrifugal mold 4 rotates, the polyurethane foam material injected from the injection hole 422 is thrown into the mold cavity 43, the feed gap 44 and the burr gap 45 by the centrifugal force of rotation. After heating, the foam material finally located in the mold cavity 43 will form a polyurethane tire blank, and the foam material located in the feed gap 44 and the burr gap 45 will form burrs. By setting the width of these two gaps, the thickness of the burrs can be controlled so that the burrs can be in a straight state, which is convenient for removing the burrs and avoiding the situation that the burrs are too thin and cannot be removed. In addition, the setting of the burr gap 45 can play a role of exhaust to a certain extent. When the polyurethane foam material enters the mold cavity 43, most of the air in the mold cavity 43 will be discharged through the feed gap 44. When the mold cavity 43 is about to be filled with polyurethane foam material, the feed gap 44 may have been blocked at this time, and the remaining small amount of gas can be squeezed into the burr gap 45. In the case where no sealing structure is provided between the upper die 42 and the lower die 41 , the molded product can eventually be discharged from the small gap between the upper die 42 and the lower die 41 .

[0042] After the polyurethane tire blank in the mold cavity 43 is heated and cured, the upper mold 42 can be opened and the polyurethane tire blank can be taken out. In order to prevent the upper mold 42 from being separated from the lower mold 41 after opening, the upper mold 42 and the lower mold 41 can be connected by a hinge on one side, and the upper mold 42 and the lower mold 41 can be locked by a latch, a screw or a buckle assembly on the other side.

[0043] Reference Figure 8 In a preferred embodiment of the present invention, the edge of the upper surface of the lower mold 41 is provided with a first annular platform 412 protruding upward, the inner side surface of the first annular platform 412 is a conical surface, and the lower surface of the upper mold 42 is provided with a second annular platform 423 surrounding the second annular groove 421, and the outer side surface of the second annular platform 423 has a conical surface that matches the inner side surface of the first annular platform 412. The upper surface of the lower mold 41 has a reference surface 413 located between the first annular platform 412 and the first annular groove 411, the lower surface of the second annular platform 423 is in contact with the reference surface 413, a sinking platform 414 is provided between the reference surface 413 and the first annular platform 412, and a burr gap 45 is formed between the upper surface of the sinking platform 414 and the lower surface of the second annular platform 423.

[0044] The injection hole 422 is a conical hole that gradually expands from top to bottom, or the injection hole 422 is in the shape of an inverted funnel hole. Among them, the inverted funnel hole shape is the best. With such a design, when the mold rotates, it is convenient for the liquid polyurethane foam material to enter the mold cavity 43 through the feeding gap 44.

[0045] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A centrifuge circulation production system for a polyurethane tire production line, characterized in that: The invention comprises a closed circulating track (1), a plurality of centrifuges mounted on the circulating track (1), a circulating power device capable of driving the centrifuges to move along the circulating track (1), and an oven (2); the oven (2) comprises a box (21) fixed relative to the circulating track (1), and a heating device arranged in the box (21); the centrifuge comprises a trolley (800), a turntable (31) rotatably arranged on the trolley (800), a centrifugal mold (4) mounted on the turntable (31), and a centrifugal driver (32) capable of driving the turntable (31) and the centrifugal mold (4) to rotate together; the box (21) has a baking cavity (210), a baking inlet and a baking outlet communicated with the baking cavity (210); when the trolley (800) moves along the circulating track (1), the centrifugal mold (4) on the trolley (800) can pass through the baking inlet, the baking cavity (210), and the baking outlet in sequence.

2. The centrifuge circulation production system of a polyurethane tire production line according to claim 1, characterized in that: The heating device is higher than the centrifugal mold (4), and the box body (21) is provided with a fan capable of generating airflow in the baking cavity (210).

3. The centrifuge circulation production system of a polyurethane tire production line according to claim 2, characterized in that: The fan comprises a main shaft (51) rotatably arranged on the top wall of the box body (21), an impeller (52) mounted on the main shaft (51) and capable of blowing air downward, and a blower motor (53) mounted on the box body (21) and capable of driving the main shaft (51) and the impeller (52) to rotate together, wherein the impeller (52) is located inside the baking chamber (210) and is higher than the centrifugal mold (4) on the trolley (800).

4. The centrifuge circulation production system of a polyurethane tire production line according to claim 1, characterized in that: The heating device comprises a plurality of heating tubes (60) fixed on the inner surface of the top of the box body (21).

5. The centrifuge circulation production system of a polyurethane tire production line according to claim 1, characterized in that: A fixed bracket (61) is provided on one side of the circulating track (1), a cross bar (62) is provided on the top of the fixed bracket (61), and the box (21) is suspended on the cross bar (62) so that the box (21) is located above the circulating track (1).

6. The centrifuge circulation production system for a polyurethane tire production line according to claim 1, characterized in that: The circulating track (1) is in the shape of an oblong, the circulating power device comprises a first sprocket (71), a second sprocket (72), a main chain (73) connected between the first sprocket (71) and the second sprocket (72), and a circulating motor capable of driving the first sprocket (71) and the second sprocket (72) to rotate, the trolley (800) comprises a frame (801) and a plurality of wheel assemblies (802) arranged at the bottom of the frame (801), and a movable connection structure is arranged between the trolley (800) and the chain to connect the two.

7. The centrifuge circulation production system of a polyurethane tire production line according to claim 6, characterized in that: A first fixed seat (81) and a second fixed seat (82) separated from each other are fixed on one side of the frame (801); the movable connection structure comprises a first connecting member (83) hinged to the first fixed seat (81), a rotating arm (84) hinged to the second fixed seat (82), and a second connecting member (85) hinged to the rotating arm (84); the first connecting member (83) and the second connecting member (85) are respectively connected to a link of the main chain (73).

8. The centrifuge circulation production system of a polyurethane tire production line according to claim 6, characterized in that: A table panel (87) is fixed on the frame (801), a bearing seat is fixed on the table panel (87), a rotating shaft inserted into the bearing seat is fixed on the turntable (31), a bearing is sleeved between the bearing seat and the rotating shaft, and the centrifugal drive (32) includes a motor mounted on the table panel (87), and an output shaft of the motor is connected to the rotating shaft.

9. The centrifuge circulation production system for a polyurethane tire production line according to claim 1, characterized in that: The centrifugal mold (4) comprises a lower mold (41) and an upper mold (42); the upper surface of the lower mold (41) is provided with a first annular groove (411); the lower surface of the upper mold (42) is provided with a second annular groove (421) corresponding to the first annular groove (411); a mold cavity (43) is formed between the first annular groove (411) and the second annular groove (421); a material injection hole (422) is provided in the middle of the upper mold (42); the lower surface of the upper mold (42) has a transition surface (4201) located between the material injection hole (422) and the second annular groove (421); a feeding gap (44) is formed between the transition surface (4201) and the lower mold (41).

10. The centrifuge circulation production system of a polyurethane tire production line according to claim 9, characterized in that: A burr gap (45) is also provided between the upper die (42) and the lower die (41), surrounding the outer side of the die cavity (43) and communicating with the die cavity (43).

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