A turn-up joint device and joint method for thermoplastic elastomer inner tube

Abstract

The present invention relates to the technical field of tire production and manufacturing, and in particular to a turn-up joint device and joint method for a thermoplastic elastomer inner tube, the device comprising a first inner tube clamp, a second inner tube clamp, a rotating assembly and a bonding assembly; the first inner tube clamp and the second inner tube clamp both comprise a first clamping block and a second clamping block, the first clamping block and the second clamping block are both provided with inner tube grooves, and the two inner tube grooves are connected to match the shape of the inner tube; the connecting end of the first inner tube clamp is connected to the rotating assembly, the mating end of the first inner tube clamp is matched with the mating end of the second inner tube clamp, and the inner tubes in the mating end of the first inner tube clamp and the mating end of the second inner tube clamp are bonded to form a bonding surface, the bonding assembly is located on the outside of the bonding surface, and the bonding assembly is used to melt and bond the bonding surface. The advantages of this patent are easy operation, increased connection area at both ends of the inner tube, increased comprehensiveness and firmness of bonding at both ends of the inner tube, increased connection strength and extended service life.

Description

Technical Field

[0001] The invention relates to the technical field of tire production and manufacturing, and in particular to a turn-up joint device and a joint method for a thermoplastic elastomer inner tire. Background Art

[0002] The tire is mainly composed of an outer tube, an inner tube, and a cushion belt, and the inner tube is an important part of the tire. The existing inner tube includes a plastic carcass and a plastic valve, such as a plastic valve and an inflatable plastic inner tube with application number 2019212494566, the valve includes a nozzle body and a rubber pad; the nozzle body is made of hard plastic material, a vent is provided in the middle of the nozzle body, and a valve core is provided in the vent; a plum blossom-shaped mating part is provided at the lower end of the nozzle body; the rubber pad is made of soft plastic material, the rubber pad is provided at the lower end of the nozzle body, the outer ring of the rubber pad spreads from the outer ring of the nozzle body to the bottom, the inner ring is provided with a stepped mating part matching the mating part, and the rubber pad and the nozzle body are connected as a whole by injection.

[0003] During the processing of the inner tube, joint processing is required. The joint processing technology forms a closed cavity annular body by bonding the two ends of a section of thermoplastic elastomer tube together. Existing joint molds, such as an inner tube joint mold disclosed in the Chinese utility model patent with publication number CN207273899U (announcement date is 2018.04.27), are arranged on an inner tube joint machine and are used to connect the inner tube semi-finished product with an annular inner tube tube. The inner tube joint mold includes an upper mold and a lower mold that can match the preset inner tube tube, the lower mold is detachably mounted on the fixed plate, the upper mold is detachably mounted on the presser foot, and the upper mold and the lower mold are arranged oppositely; the lower mold includes a lower mold body, and the lower mold body is provided with a positioning part that can cooperate with the upper mold to position the inner tube tube on the side facing the upper mold. The upper mold and the lower mold of the inner tube joint mold of the present invention have multiple models and are easy to disassemble and assemble. Each model of the upper mold and the lower mold can match the inner tube tube of preset specifications, thereby improving the butt joint quality and precision of the inner tube tube. The present invention further proposes an inner tube joint machine, which can be suitable for inner tube tubes of different specifications and has high butt joint quality and precision of the inner tube tube.

[0004] The existing joint mold has the problem that the joint processing cannot be well connected due to the small bonding area, which is easy to cause misalignment or uneven docking, resulting in poor bonding strength at both ends of the inner tube, affecting the quality and service life of the inner tube. Summary of the invention

[0005] The purpose of the present invention is to solve the problem of low bonding strength of the existing inner tubes mentioned above, and to provide a turn-up joint device for a thermoplastic elastomer inner tube that is convenient for aligning and bonding the two ends of the inner tube through a first inner tube clamp and a second inner tube clamp, and that increases the bonding contact area by turning up the two ends of the inner tube and then turning up one end of the inner tube again onto the inner tube at the other end, and that facilitates the bonding operation through a rotating component and an adhesive component, thereby improving the bonding efficiency, bonding quality and aesthetics.

[0006] For the purpose of the present invention, the following technical solutions are adopted to achieve the goal:

[0007] A turn-up joint device for a thermoplastic elastomer inner tube, the device comprises a first inner tube clamp, a second inner tube clamp, a rotating assembly and a bonding assembly; the first inner tube clamp and the second inner tube clamp both comprise a first clamping block and a second clamping block, the first clamping block and the second clamping block are both provided with inner tube grooves, and the two inner tube grooves are connected to match the shape of the inner tube; the connecting end of the first inner tube clamp is connected to the rotating assembly, the mating end of the first inner tube clamp is mated with the mating end of the second inner tube clamp, and the inner tubes in the mating end of the first inner tube clamp and the mating end of the second inner tube clamp are bonded to form a bonding surface, the bonding assembly is located on the outside of the bonding surface, and the bonding assembly is used to melt and bond the bonding surface. The first inner tube clamp and the second inner tube clamp facilitate better positioning and fixing of the two ends of the inner tube, and the rotating assembly and the bonding assembly facilitate melting and bonding of the two ends of the inner tube while rotating, so that the two ends of the inner tube are better bonded together, improving the overall bonding efficiency and overall bonding quality.

[0008] Preferably, the two inner tube grooves are connected to form a ring that matches the inner tube. The inner tube groove is convenient for better matching with the inner tube and improving the stability of the inner tube during the joint process.

[0009] Preferably, a pressing roller is also provided on the outside of the bonding surface, so as to facilitate pressing the inner tube during the bonding process and improve the bonding strength.

[0010] Preferably, the rotating assembly includes a rotating motor and a rotating frame, and the rotating frame is connected to the rotating shaft of the rotating motor. The rotating assembly facilitates all-round bonding and improves bonding quality.

[0011] Preferably, the rotating frame is also provided with a lock for locking the first inner tube clamp, so as to improve the stability during the rotation process.

[0012] Preferably, the bonding component is a laser transmitter, which facilitates melting and bonding of the inner tube and excision of the redundant turned-up portion after bonding.

[0013] As preferably, the bonding assembly is an ultrasonic transmitter, and the ultrasonic head of the ultrasonic transmitter is in an arc shape that matches the inner tube. The ultrasonic transmitter is convenient for melting and bonding the inner tube, and the ultrasonic head is convenient for better matching with the inner tube.

[0014] A method for turning up a thermoplastic elastomer inner tube and a tube joint, which comprises the following steps in sequence: clamping two ends of an inner tube by a first inner tube clamp and a second inner tube clamp respectively, leaving a distance at each end, turning up the excess parts of the inner tubes at the two ends onto the first inner tube clamp and the second inner tube clamp by a turning-up component respectively, removing the turning-up component, manually turning up the turned-up inner tube on the second inner tube clamp again onto the turned-up part of the inner tube of the first inner tube clamp, opening the second inner tube clamp, connecting the connecting end of the first inner tube clamp to a rotating component and driving it to rotate for one circle, melting and welding the turned-up parts at both ends of the inner tube by a bonding component, rolling by a pressing roller at the same time, cutting off the excess turned-up parts after bonding, and finally taking out the inner tube after the joint is completed.

[0015] A thermoplastic elastomer inner tube comprises a plastic tube body and a plastic valve, the plastic valve comprises a nozzle body and a rubber pad, the rubber pad is bonded to the plastic tube body by hot melt, both ends of the plastic tube body comprise a clamping support portion, a turn-up butt joint portion and a turn-up bonding portion; the clamping support portion, the turn-up butt joint portion and the turn-up bonding portion are connected as a whole, the turn-up butt joint portion is located between the clamping support portion and the turn-up bonding portion, and the inner tube is formed into a closed annular body by bonding the turn-up bonding portions at both ends to each other.

[0016] Preferably, the nozzle body is made of hard plastic material, a vent is provided in the middle of the nozzle body, a valve core is provided in the vent, a plum blossom-shaped matching portion is provided at the lower end of the nozzle body, the matching portion includes a matching groove and a matching step, and the matching step is protruding outward; the matching groove is connected to the top of the matching step; the matching groove is not limited to the length of each step in the matching step; the rubber pad is made of soft plastic material, the rubber pad is arranged at the lower end of the nozzle body, the outer circle of the rubber pad spreads from the outer circle of the nozzle body to the bottom, the inner circle is provided with a stepped matching portion matching the matching portion, and the rubber pad and the nozzle body are connected into one by injection.

[0017] A thermoplastic elastomer inner tube turn-up joint device adopts the above technical solution. The device facilitates better limiting and fixing of the two ends of the inner tube through the first inner tube clamp and the second inner tube clamp, and facilitates better cooperation with the inner tube through the inner tube groove, thereby improving the stability of the inner tube during the joint process; by turning one end of the inner tube to the other end of the inner tube, a bonding surface is formed between the two, the bonding area is increased, and it is convenient to bond together better; the inner tube is driven to rotate by a rotating component, and the bonding surfaces at both ends of the inner tube are melted and bonded by the bonding component in different operating modes, and the comprehensiveness and bonding firmness of the bonding are improved by cooperating with the rotating and pressing rollers, thereby improving the overall bonding firmness of the two ends of the inner tube, improving the overall bonding quality and extending the service life.

[0018] To sum up, the advantages of this patent are easy operation, increased connection area at both ends of the inner tube, improved comprehensiveness and firmness of the bonding at both ends of the inner tube, increased connection strength and extended service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the turn-up joint device of the present invention.

[0020] Figure 2 It is a schematic structural diagram of the bonding assembly and the pressing roller of the present invention.

[0021] Figure 3 It is a schematic structural diagram of the first inner tube clamp of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the present invention when it is reversed.

[0023] Figure 5 It is a schematic structural diagram of the valve nozzle of the present invention.

[0024] Figure 6 It is a plan view of the valve of the present invention. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Example 1

[0027] like Figures 1 to 4As shown, a thermoplastic elastomer inner tube turn-up joint device includes a first inner tube clamp 1, a second inner tube clamp 2, a rotating assembly 3 and a bonding assembly 4; the first inner tube clamp 1 and the second inner tube clamp 2 both include a first clamping block 101 and a second clamping block 102, and the first clamping block 101 and the second clamping block 102 are both provided with an inner tube groove 103, and the two inner tube grooves 103 are connected to form a ring that matches the inner tube, and the inner tube groove 103 facilitates better matching with the inner tube, thereby improving the stability of the inner tube during the joint process. The connecting end of the first inner tube clamp 1 is connected to the rotating assembly 3, and the rotating assembly 3 includes a rotating motor 31 and a rotating frame 32, and the rotating frame 32 is connected to the rotating shaft of the rotating motor 31, and the rotating frame 32 is driven to rotate by the rotating motor 31, and the rotating frame 32 is also provided with a lock 321 for locking the first inner tube clamp 1, and the lock 321 improves the stability during the rotation process. The mating end of the first inner tube fixture 1 is mated with the mating end of the second inner tube fixture 2, and the inner tubes in the mating end of the first inner tube fixture 1 and the mating end of the second inner tube fixture 2 are bonded to form a bonding surface 10, and the bonding surface 10 is formed by first turning up the inner tube in the first inner tube fixture 1 and the inner tube in the second inner tube fixture 2, and then turning up the inner tube in the second inner tube fixture 2 onto the inner tube in the first inner tube fixture 1. A clamping roller 100 is also provided on the outer side of the bonding surface 10, which drives the inner tube in the first inner tube fixture 1 to rotate through the rotating motor 31, so that the two ends of the inner tube rotate at the same time, and by cooperating with the clamping roller 100, the bonding surfaces are pressed while melting and bonding together, thereby improving the bonding firmness and comprehensiveness of the bonding. The bonding component 4 is a laser emitter, which is located above the bonding surface 10, and the laser emitter and the clamping roller 100 are not on the same vertical line. The laser emitter is used to melt and bond the bonding surface 10, and to cut off the excess turned-up part after melting, so as to facilitate melting and bonding the inner tube and to cut off the excess turned-up part after bonding, thereby improving the operation convenience and improving the bonding strength.

[0028] A method for turning up a thermoplastic elastomer inner tube joint, which comprises the following steps in sequence: clamping two ends of an inner tube by a first inner tube clamp 1 and a second inner tube clamp 2, leaving a distance at each end, turning up the excess parts of the inner tubes at both ends onto the first inner tube clamp 1 and the second inner tube clamp 2 by a turning-up component, removing the turning-up component, manually turning up the turned-up inner tube on the second inner tube clamp 2 again onto the turned-up part of the inner tube of the first inner tube clamp 1, opening the second inner tube clamp 2, connecting the connecting end of the first inner tube clamp 1 to a rotating component 3 and driving it to rotate for one circle, melting and welding the turned-up parts at both ends of the inner tube by a laser transmitter, rolling by a clamping roller 100 at the same time, and after bonding, cutting off the excess turned-up parts by a laser transmitter, and finally taking out the inner tube after the joint is completed.

[0029] The reverse package component is used to reverse the excess part of the inner tube in the end of the first inner tube fixture 1 to the outer wall of the first inner tube fixture 1, and reverse the excess part of the inner tube in the end of the second inner tube fixture 2 to the outer wall of the second inner tube fixture 2. The reverse package component includes a small airbag, through which the inner tube at the end of the inner tube groove 103 in the first inner tube fixture 1 and the second inner tube fixture 2 is reversed. The airbag is used to better control the reverse effect of the inner tube and also facilitate the reverse operation. After the laser transmitter completes the melting welding, the reversed part can also be cut off after bonding to improve the integrity and aesthetics of the inner tube.

[0030] A thermoplastic elastomer inner tube comprises a plastic tube body and a plastic valve, wherein the plastic valve comprises a nozzle body 5 and a rubber pad 6, wherein the rubber pad 6 is bonded to the plastic tube body by hot melting, and wherein both ends of the plastic tube body comprise a clamping support portion 41, a reversed docking portion 42 and a reversed adhesive portion 43; the clamping support portion 41, the reversed docking portion 42 and the reversed adhesive portion 43 are connected as a whole, the clamping support portions 41 at both ends are respectively located in the inner tube groove 103 of the first inner tube clamp 1 and the second inner tube clamp 2, and the reversed docking portions 42 at both ends contact the inner end surfaces of the first inner tube clamp 1 and the second inner tube clamp 2 for alignment connection. The reversed adhesive portions 43 at both ends are reversed twice by reversed adhesive portions 43 at one end, and reversed to the reversed adhesive portion 43 at the other end to form an adhesive surface 10, and during bonding, the adhesive surface 10 is melted and extruded and bonded together in an arc shape, and the reversed adhesive portions 43 at both ends are bonded to each other to form a closed annular body of the inner tube. After bonding, the redundant turned-up bonding portion 43 is cut off to improve the overall aesthetics and integrity of the inner tube.

[0031] like Figure 5 and Figure 6As shown, the plastic valve includes a nozzle body 5 and a rubber pad 6. The nozzle body 5 is made of hard plastic material, which can be easily connected and matched with the inflation joint to prevent air leakage. A vent hole 501 is provided in the middle of the nozzle body 5; a valve core 5011 is provided in the vent hole 501; a plum blossom-shaped matching part 502 is provided at the lower end of the nozzle body 5, and the plum blossom shape can increase the contact area with the rubber pad 6 and increase the connection strength with the rubber pad 6. The matching part 502 includes a matching groove 5021 and a matching step 5022, and the matching step 5022 is outwardly protruding; it is convenient for the nozzle body 5 and the rubber pad 6 to be processed. The matching groove 5021 is connected to the top of the matching step 5022; the matching groove 5021 can better fix the rubber pad 6 on the nozzle body 5 and increase the connection firmness of the two. The length of the matching groove 5021 is greater than the length of each step in the matching step 5022, which can increase the connection area between the top of the rubber pad and the matching groove and increase the connection strength. The diameter of the bottom of the nozzle body 5 is greater than the diameter of the top of the nozzle body 5. Increasing the contact area between the bottom of the nozzle body 5 and the rubber pad 6, and increasing the bonding area between the rubber pad 6 and the inner tube, can make the rubber pad 6 stick more firmly and stably. The rubber pad 6 is made of soft plastic material, and the rubber pad 6 is arranged at the lower end of the nozzle body 5. The cross section of the rubber pad 6 is hollow truncated cone-shaped. The outer ring of the rubber pad 6 spreads from the outer ring of the nozzle body to the bottom, which can make the rubber pad more tightly bonded to the inner tube and prevent the rubber pad 6 from easily falling off the inner tube. The inner ring is provided with a plum blossom matching part 601 that matches the matching part 502. The plum blossom matching part 601 is connected and matched with the matching part 502 to increase the connection strength between the two and prevent air leakage.

[0032] Example 2

[0033] This embodiment is different from the embodiment 1 only in the bonding component 4, and the other structures and usages are the same.

[0034] The bonding component 4 of this embodiment is an ultrasonic transmitter, and the ultrasonic head of the ultrasonic transmitter is in an arc shape that matches the inner tube. The ultrasonic transmitter facilitates melting and bonding the inner tube, and the ultrasonic head facilitates better matching with the inner tube. After bonding, the redundant reversed part is cut and removed by ultrasonic wave.

[0035] The inner tube joint process can be achieved through two different methods, namely, an ultrasonic transmitter and a laser transmitter, which not only improves convenience but also facilitates improving bonding strength and bonding quality.

[0036] The device facilitates better positioning and fixing of the two ends of the inner tube through the first inner tube clamp 1 and the second inner tube clamp 2, and facilitates better cooperation with the inner tube through the inner tube groove 103, thereby improving the stability of the inner tube during the joint process; by wrapping one end of the inner tube to the other end of the inner tube, a bonding surface is formed between the two, the bonding area is increased, and better bonding is facilitated; the inner tube is driven to rotate through the rotating component 3, and the bonding surfaces at the two ends of the inner tube are melted and bonded through the bonding component 4 in different operating modes, and the comprehensiveness and firmness of the bonding are improved by cooperating with the rotating and pressing rollers, thereby improving the overall bonding firmness of the two ends of the inner tube, improving the overall bonding quality and extending the service life.

[0037] To sum up, the advantages of this patent are easy operation, increased connection area at both ends of the inner tube, improved comprehensiveness and firmness of the bonding at both ends of the inner tube, increased connection strength and extended service life.

Claims

1. A method for turning up a thermoplastic elastomer inner tube joint, characterized in that: The following steps are performed in sequence: the two ends of the inner tube are clamped by the first inner tube clamp (1) and the second inner tube clamp (2), leaving a distance at each end; the excess parts of the inner tubes at the two ends are respectively reversed onto the first inner tube clamp (1) and the second inner tube clamp (2) by the reversed assembly; the reversed assembly is removed; the reversed inner tube on the second inner tube clamp (2) is manually reversed again onto the reversed part of the inner tube of the first inner tube clamp (1); the second inner tube clamp (2) is opened; the connection end of the first inner tube clamp (1) is connected to the rotating assembly (3) and driven to rotate for one circle; the reversed parts at the two ends of the inner tube are melt-welded by the bonding assembly (4); and the pressure roller (100) is used to roll the reversed parts at the two ends; after bonding, the excess reversed parts are cut off; and finally, the inner tube with the completed joint is taken out.

2. The method according to claim 1, characterized in that The first inner tube clamp (1) and the second inner tube clamp (2) both comprise a first clamping block (101) and a second clamping block (102); the first clamping block (101) and the second clamping block (102) are both provided with inner tube grooves (103), and the two inner tube grooves (103) are connected to match the shape of the inner tube; the connecting end of the first inner tube clamp (1) is connected to the rotating component (3); the matching end of the first inner tube clamp (1) matches the matching end of the second inner tube clamp (2); the inner tubes in the matching end of the first inner tube clamp (1) and the matching end of the second inner tube clamp (2) are bonded to form a bonding surface (10); the bonding component (4) is located outside the bonding surface (10); and the bonding component (4) is used to melt and bond the bonding surface (10).

3. The method according to claim 2, characterized in that The two inner tube grooves (103) are connected to form a ring shape matching the inner tube.

4. The method according to claim 2, characterized in that: A pressing roller (100) is also provided on the outer side of the bonding surface (10).

5. The method according to claim 2, characterized in that: The rotating assembly (3) comprises a rotating motor (31) and a rotating frame (32), wherein the rotating frame (32) is connected to the rotating shaft of the rotating motor (31).

6. The method according to claim 5, characterized in that The rotating frame (32) is also provided with a lock (321) for locking the first inner tube clamp (1).

7. The method according to claim 2, characterized in that: The bonding component (4) is a laser emitter.

8. The method according to claim 2, characterized in that: The bonding component (4) is an ultrasonic transmitter, and the ultrasonic head of the ultrasonic transmitter is in an arc shape that matches the inner tube.

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