Inner tube vulcanizing equipment

Abstract

The present invention discloses an inner tube vulcanization equipment, and relates to the technical field of tire vulcanization. The equipment comprises a base, a lower mold shell is fixed on the top of the base, an upper mold shell is arranged on the top of the lower mold shell, a driving mechanism is arranged on the back of the lower mold shell and the upper mold shell, and the upper mold shell and the lower mold shell are driven by the driving mechanism to close and open the mold; a lower mold cavity and an upper mold cavity are respectively arranged on the top of the lower mold shell and the bottom of the upper mold shell, and after closing the mold, the cross section of the cavity composed of the lower mold cavity and the upper mold cavity is circular, an air intake assembly is arranged on the outer side of the lower mold cavity, and a gas generating device is connected to one side of the air intake assembly. The inner tube to be vulcanized of the present invention is not inflated in advance, and after closing the mold, a certain temperature of gas is introduced into the mold cavity, and the inner tube is inflated while the inner tube is vulcanized, so as to prevent the inner tube from being scalded and vulcanized unevenly due to early inflation and direct vulcanization.

Description

Technical Field

[0001] The invention relates to the technical field of tire vulcanization, in particular to an inner tube vulcanization device. Background Art

[0002] Vulcanization is the process in which rubber macromolecules react chemically with the cross-linking agent sulfur under heating to form a three-dimensional network structure. The rubber after vulcanization is called vulcanized rubber. Vulcanization is the last step in rubber processing, which can produce a finalized rubber product with practical value. The inner tube made of rubber needs to go through the vulcanization process. The process flow of inner tube production can be roughly divided into: preparation of inner tube rubber compound, extrusion of inner tube tube, joint of inner tube tube, and inner tube vulcanization.

[0003] The uncured inner tube used in the tire tube shaping has plasticity. Since the inner tube vulcanized in the inner tube vulcanization mold is an inflated inner tube, the inner tube of the inner tube is expanded and stretched after the inner tube is inflated, and the wall thickness of the inner tube is reduced. It is very easy to be burned after encountering the high temperature of the inner tube vulcanization mold. In the existing process, the inner tube is inflated and then placed in the tire vulcanization mold. After the valve is inflated, it is generally sealed by a cap or paraffin is inserted into the inner tube valve. This has the following problems:

[0004] First, the process of sealing the valve with a cap, screwing the cap before vulcanization and removing the cap after vulcanization will increase the workload of the workers, and the air pressure of the inner tube after vulcanization is relatively high, and personnel may be scalded when the air is released. The process of sealing the valve with paraffin wax, under the combined effect of internal pressure and mold temperature, the paraffin wax is passed into the inner tube and melted, which will cause uneven vulcanization of the inner tube, affecting the quality of the inner tube;

[0005] Secondly, after the inner tube is inflated, the tube of the inner tube is expanded and stretched, and the wall thickness of the inner tube is reduced, which is very easy to be burned when it encounters the high temperature inner tube vulcanization mold;

[0006] Finally, the temperature in the vulcanization chamber and the gas temperature in the inner tube are quite different, which causes thermal stress concentration in the inner tube during the vulcanization process, resulting in cracks or deformation. Summary of the invention

[0007] The object of the present invention is to provide an inner tube vulcanizing device to solve the problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solution: an inner tube vulcanization device, comprising a base, a lower mold shell is fixed on the top of the base, an upper mold shell is arranged on the top of the lower mold shell, and a driving mechanism is arranged on the back of the lower mold shell and the upper mold shell, and the driving mechanism drives the upper mold shell and the lower mold shell to close and open the mold;

[0009] The top of the lower mold shell and the bottom of the upper mold shell are respectively provided with a lower mold cavity and an upper mold cavity. After the molds are closed, the cross section of the cavity formed by the lower mold cavity and the upper mold cavity is circular.

[0010] An air intake assembly is arranged on the outer side of the lower mold cavity, and a gas generating device is connected to one side of the air intake assembly. After the mold is closed, the external gas is dried, degreased and heated by the gas generating device, and then enters the cavity composed of the lower mold cavity and the upper mold cavity through the air intake assembly;

[0011] Multiple sets of supporting devices are arranged on both sides of the bottom of the lower mold cavity and both sides of the top of the upper mold cavity, and the inner tube to be vulcanized is placed between the top and bottom supporting devices;

[0012] A second airbag is fixed to the bottom of the upper mold shell located inside the upper mold cavity, a first airbag is fixed to the top of the lower mold shell located inside the lower mold cavity, a pressure-bearing and air-pumping assembly is arranged outside the first airbag, the pressure-bearing and air-pumping assembly comprises an annular movable block and an annular cavity, and the annular movable block is movably arranged in the annular cavity;

[0013] After the mold is closed, the first airbag and the second airbag, as well as the upper mold shell and the annular movable block are squeezed against each other, and a pump air cavity is formed between the first airbag, the second airbag and the annular movable block;

[0014] A plurality of air inlet holes are provided on the inner side of the lower mold cavity, and the air inlet holes are communicated with the annular cavity.

[0015] Furthermore, the air intake assembly includes a plurality of intake branch pipes distributed in a ring shape, the outer side of the intake branch pipe is fixedly connected to an annular pipe, the side of the annular pipe is fixedly connected to an intake main pipe, and the intake main pipe is connected to the gas generating device.

[0016] Furthermore, the support device includes an arc-shaped receiving groove, a movable cavity and a movable rod, an arc-shaped stopper is fixed to one end of the movable rod, a magnetic conductive block is fixed to the other end of the movable rod, and a first spring is fixed between the magnetic conductive block and the bottom wall of the movable cavity;

[0017] An electromagnet is fixed on the top wall of the movable cavity. After power is turned on, the electromagnet and the magnetic conductive block attract each other, and the arc-shaped stopper is stored in the arc-shaped storage groove.

[0018] Furthermore, an elastic sealing pad is fixed to the bottom end of the upper mold shell, and after the mold is closed, the elastic sealing pad is squeezed with the annular movable block.

[0019] Furthermore, the air inlet holes are located on opposite sides of the air inlet assembly.

[0020] Furthermore, the pressure-bearing and pumping air components also include a plurality of middle holes opened on the annular movable block and a plurality of side holes opened on the top of the lower mold shell and connected to the pumping air cavity. A second spring is fixed between the bottom end of the annular movable block and the bottom wall of the annular cavity. After the mold is closed, the middle hole and the side hole are connected.

[0021] Furthermore, an annular outer step surface is formed at the top end of the lower mold shell, and an annular inner step surface is formed at the bottom end of the upper mold shell, and the annular inner step surface is matched with the annular outer step surface.

[0022] Furthermore, a convex island is formed in the middle of the top end of the lower mold shell, and the distance between the top end surface of the lower mold shell and the top end surface of the convex island is 1 / 5-3 / 5 of the radius of the lower mold cavity.

[0023] Furthermore, the top end of the upper mold shell is fixedly connected to a pressure relief pipe, and a pressure relief valve is connected to the pipe body of the pressure relief pipe.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The inner tube vulcanizing equipment does not pre-inflate the inner tube to be vulcanized. After the mold is closed, a gas at a certain temperature is introduced into the mold cavity to inflate the inner tube while the inner tube is being vulcanized, thereby preventing the inner tube from being burned and vulcanized unevenly due to premature inflation and direct vulcanization.

[0026] At the same time, a supporting device is provided, and the inner tube to be vulcanized is placed between the top and bottom supporting devices. The supporting device can prevent the inner tube to be vulcanized from directly contacting the high-temperature side wall of the mold cavity after the mold is opened, thereby avoiding direct contact between the inner tube to be vulcanized and the side wall of the mold cavity, resulting in large-area uneven vulcanization of the inner tube and affecting the quality of the inner tube, thereby improving the vulcanization quality of the inner tube.

[0027] In addition, the mixed air in the cavity moves through both sides of the cavity, and the gas in the cavity can enter the pump air cavity through the air inlet hole, the annular cavity, the middle hole and the side hole, and finally the inner tube is inflated through the valve nozzle. As the temperature of the air in the cavity gradually increases, the temperature of the air entering the inner tube to be vulcanized also gradually increases, making the temperature difference between the air in the cavity and the air pumped into the inner tube to be vulcanized smaller, avoiding thermal stress concentration in the inner tube during the vulcanization process, and preventing the inner tube from cracking or deformation.

[0028] Furthermore, after the inner tube is vulcanized, the mold is separated, and the mold cavity and the pump air cavity are in an open state. The gas in the mold cavity and the pump air cavity is directly discharged to the outside. At this time, the gas in the vulcanized inner tube is automatically discharged through the valve nozzle. Since the valve nozzle is located on the inner side of the lower mold shell, its air outlet is far away from the human body, and no manual operation is required for automatic exhaust, thereby achieving the goal that the high-temperature gas in the inner tube will not cause harm to the human body when it is exhausted.

[0029] In addition, the inner tube pumping process does not need to be sealed with a cap or paraffin, which reduces the workload and improves product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 A bottom view of the upper mold shell of the present invention;

[0032] Figure 3 A half-section diagram of the present invention;

[0033] Figure 4 for Figure 3 A magnified view of part A;

[0034] Figure 5 for Figure 3 A magnified view of part B;

[0035] Figure 6 It is a half-section view after mold closing of the present invention.

[0036] In the figure: 1. base; 2. lower mold shell; 201. lower mold cavity; 202. annular outer step surface; 203. convex island; 3. upper mold shell; 301. upper mold cavity; 302. annular inner step surface; 4. driving mechanism; 5. air intake assembly; 501. air intake branch pipe; 502. annular pipe; 503. air intake main pipe; 6. air intake hole; 601. middle hole; 602. side hole; 603. annular cavity; 701. arc-shaped receiving groove; 702. movable cavity; 703. arc-shaped stopper; 704. magnetic block; 705. first spring; 706. electromagnet; 801. first air bag; 802. second air bag; 803. annular movable block; 804. elastic sealing pad; 805. pump air cavity; 806. second spring; 9. pressure relief pipe. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figure 1-Figure 6 As shown, the present invention provides a technical solution: an inner tube vulcanization equipment, including a base 1, a lower mold shell 2 is fixed on the top of the base 1, an upper mold shell 3 is arranged on the top of the lower mold shell 2, and a driving mechanism 4 is arranged on the back of the lower mold shell 2 and the upper mold shell 3, wherein the driving mechanism 4 can be a hydraulic cylinder, a screw pair or other components that can realize the closing and opening of the upper mold shell 3 and the lower mold shell 2, which is a mature existing technology and will not be repeated in this solution.

[0039] like Figure 3As shown, a lower mold cavity 201 and an upper mold cavity 301 are respectively opened at the top of the lower mold shell 2 and the bottom of the upper mold shell 3, and a pressure relief pipe 9 is fixedly connected to the top of the upper mold shell 3. A pressure relief valve is connected to the tube body of the pressure relief pipe 9. After the mold is closed, the cross-section of the cavity formed by the lower mold cavity 201 and the upper mold cavity 301 is circular. In this scheme, the radius of the cross-section of the cavity formed by the lower mold cavity 201 and the upper mold cavity 301 is larger than the radius of the cross-section after the inner tube to be vulcanized is inflated. Such a setting not only facilitates the removal of the vulcanized inner tube, but also prevents the large contact area between the inflated inner tube and the cavity surface, resulting in uneven heating of the inner tube.

[0040] A plurality of supporting devices are arranged on both sides of the bottom of the lower mold cavity 201 and on both sides of the top of the upper mold cavity 301. It is understandable that since the temperature of the side walls of the lower mold cavity 201 and the upper mold cavity 301 is relatively high after the previous mold opening, directly placing the inner tube to be vulcanized will cause large-area uneven vulcanization of the inner tube due to direct contact between the side walls of the lower mold cavity 201 and the upper mold cavity 301 and the inner tube to be vulcanized, thereby affecting the quality of the inner tube. In this solution, the inner tube to be vulcanized is placed between the top and bottom supporting devices, and the supporting devices can prevent the inner tube to be vulcanized from directly contacting the side walls of the lower mold cavity 201 and the upper mold cavity 301, thereby improving the vulcanization quality of the inner tube.

[0041] like Figure 4 and Figure 5 As shown, an annular outer step surface 202 is formed at the top of the lower mold shell 2, and an annular inner step surface 302 is formed at the bottom of the upper mold shell 3. The annular inner step surface 302 is adapted to the annular outer step surface 202. This arrangement increases the fitting area between the lower mold shell 2 and the upper mold shell 3, thereby increasing the sealing between the lower mold shell 2 and the upper mold shell 3 after mold closing, reducing heat waste, and forming a convex island 203 in the middle of the top of the lower mold shell 2. Figure 6 As shown, the distance h between the top surface of the lower mold shell 2 and the top surface of the convex island 203 is 1 / 5-3 / 5 of the radius H of the lower mold cavity 201. In a preferred embodiment of the present scheme, the distance h between the top surface of the lower mold shell 2 and the top surface of the convex island 203 is 2 / 5 of the radius H of the lower mold cavity 201.

[0042] It is understandable that in order to prevent the inner tube from being damaged and unevenly vulcanized due to premature inflation and direct vulcanization, before vulcanization, the inner tube to be vulcanized is only shaped without inflation, and is not pre-inflated. In this way, after the inner tube to be vulcanized is placed horizontally in the lower mold cavity 201, the valve position of the inner tube to be vulcanized is lower than the valve position of the inner tube to be vulcanized after inflation. In this solution, since the convex island 203 is set relatively low and the supporting device at the bottom can support the bottom of the inner tube to be vulcanized, the valve nozzle can be prevented from warping after being placed on the top of the convex island 203, which facilitates the sealing of the valve nozzle rod after mold closing, and then facilitates the inflation of the inner tube to be vulcanized.

[0043] like Figure 1 and Figure 2 As shown, an air intake assembly 5 is arranged on the outer side of the lower mold cavity 201, wherein the air intake assembly 5 includes a plurality of air intake branches 501 distributed in an annular manner, the distribution angle of the plurality of air intake branches 501 is 30-50 degrees, an annular tube 502 is fixedly connected to the outer side of the air intake branch 501, and an air intake main pipe 503 is fixedly connected to the side of the annular tube 502, and a gas generating device (not shown in the figure) is connected to one side of the air intake assembly 5. After the mold is closed, the external gas is dried, degreased and heated by the gas generating device, and then enters the lower mold cavity 201 and the upper mold cavity 201 through the air intake assembly 5. In the mold cavity formed by the mold cavity 301, specifically, the gas generating device includes an air compressor, an air storage tank, an oil-water separator and a heat exchanger. The air at room temperature is pressurized to 0.8-1.00Mpa by the compressor and sent to the air storage tank for preliminary deoiling and dehydration, and then sent to the oil-water separator for further deoiling and dehydration. The gas after deoiling and dehydration enters the heat exchanger for heating. At this time, the temperature of the compressed air after heat exchange is 140-160 degrees Celsius. The high-pressure and high-temperature air finally enters the mold cavity after the mold is closed through the air intake main pipe 503, the annular pipe 502 and the air intake branch pipe 501.

[0044] like Figure 4 , Figure 5 and Figure 6 As shown, a second air bag 802 is fixed to the bottom of the upper mold shell 3 located inside the upper mold cavity 301, and a first air bag 801 is fixed to the top of the lower mold shell 2 located inside the lower mold cavity 201. After the inner tube to be vulcanized is placed, the valve is located at the top of the first air bag 801 (the valve is located on the inner side of the inner tube), and a pressure-bearing and pumping air component is arranged on the outer side of the first air bag 801, wherein, as shown in FIG. Figure 3 and Figure 5 As shown, the pressure-bearing and pumping air components include an annular movable block 803 and an annular cavity 603, and the annular movable block 803 is movably arranged in the annular cavity 603. After the mold is closed, the first air bag 801 and the second air bag 802 and the upper mold shell 3 and the annular movable block 803 are squeezed against each other. It can be understood that since the first air bag 801 and the second air bag 802 both have a certain elasticity, after the mold is closed, the first air bag 801 and the second air bag 802 are squeezed and deformed to wrap the valve mouth, further improving the sealing of the cavity after the mold is closed. In addition, an annular pumping air cavity 805 is formed between the first air bag 801, the second air bag 802 and the annular movable block 803, and the end of the inner tube valve mouth is located in the pumping air cavity 805. A plurality of air inlet holes 6 are opened on the inner side of the lower mold cavity 201, and the angle of distribution of the plurality of air inlet holes 6 is 30-50 degrees, and the air inlet holes 6 are connected to the annular cavity 603.

[0045] like Figure 3 , Figure 5 and Figure 6As shown, the pressure-bearing and air pumping components also include a plurality of middle holes 601 provided on the annular movable block 803 and a plurality of side holes 602 provided on the top of the lower mold shell 2 and connected with the air pumping cavity 805. A second spring 806 is fixed between the bottom end of the annular movable block 803 and the bottom wall of the annular cavity 603. After the mold is closed, the middle hole 601 and the side hole 602 are connected. The gas in the mold cavity can enter into the air pumping cavity 805 through the air inlet hole 6, the annular cavity 603, the middle hole 601 and the side hole 602, and the inner tube is inflated through the valve nozzle.

[0046] In order to make the temperature of the gas entering the annular cavity 603 rise evenly and improve the quality of the inner tube vulcanization, Figure 3 As shown, the air inlet holes 6 are located on opposite sides of the air inlet component 5 .

[0047] like Figure 3 and Figure 4 As shown, the supporting device includes an arc-shaped receiving groove 701, an active cavity 702 and a movable rod, an arc-shaped stopper 703 is fixed at one end of the active rod, and the arc diameter of the inner arc surface of the arc-shaped stopper 703 is equal to the arc diameter of the inner wall of the cavity, and a magnetic block 704 is fixed at the other end of the active rod, and a first spring 705 is fixed between the magnetic block 704 and the bottom wall of the active cavity 702, and an electromagnet 706 is fixed on the top wall of the active cavity 702. After power is turned on, the electromagnet 706 and the magnetic block 704 attract each other. In addition, a guide rod is fixed on the arc-shaped stopper 703, and the guide rod can It is enough to ensure that after the electromagnet 706 and the magnetic block 704 are attracted to each other, the arc-shaped stopper 703 can be received in the arc-shaped receiving groove 701. When the arc-shaped stopper 703 can be completely received in the arc-shaped receiving groove 701, the inner arc surface of the arc-shaped stopper 703 is completely in contact with the inner wall of the cavity. It should be understood that in the present scheme, the arc-shaped stopper 703 is configured to be movable. When the inflation of the inner tube to be vulcanized is completed, the arc-shaped stopper 703 is separated from the contact with the inner tube to be vulcanized to ensure that the outer surface of the inner tube to be vulcanized can be fully in contact with the hot air in the cavity, thereby further improving the vulcanization effect.

[0048] In order to improve the sealing performance of the pump air cavity 805 after the mold is closed, an elastic sealing pad 804 is fixed to the bottom end of the upper mold shell 3. After the mold is closed, the elastic sealing pad 804 is squeezed with the annular movable block 803.

[0049] To supplement this solution, the inner tube to be vulcanized is initially shaped by a shaping machine, and then the inner tube to be vulcanized is placed between the top and bottom supporting devices, and the lower mold shell 2 and the upper mold shell 3 are molded together by the driving mechanism 4. At this time, the first air bag 801 and the second air bag 802 are squeezed and deformed to wrap the valve mouth, and the air inlet of the valve mouth is located in the pump air cavity 805, the elastic sealing gasket 804 is squeezed with the annular movable block 803, the second spring 806 contracts, and the annular movable block 803 moves downward until the middle hole 601 and the side hole 602 are connected. The external gas is dried, degreased and heated by the gas generating device, and then enters the cavity composed of the lower mold cavity 201 and the upper mold cavity 301 through the air intake assembly 5. Since the lower mold was opened after the previous processing, Cavity 201 and upper mold cavity 301 are in contact with the outside air. At this time, the temperature of the mold cavity after mold closing is relatively low. Since the air pressure in the mold cavity is continuously increased (hot air is continuously pumped in), the hot air is mixed with the air with a lower temperature in the mold cavity. The mixed air in the mold cavity moves through both sides of the mold cavity. The gas in the mold cavity can enter the pump air cavity 805 through the air inlet hole 6, the annular cavity 603, the middle hole 601 and the side hole 602. Finally, the inner tube is inflated through the valve. Since the temperature of the air in the mold cavity gradually increases, the temperature of the air entering the inner tube to be vulcanized also gradually increases, so that the temperature difference between the air in the mold cavity and the air pumped into the inner tube to be vulcanized is small, so as to avoid the concentration of thermal stress in the inner tube during the vulcanization process and prevent the inner tube from cracking or deforming.

[0050] As the inner tube continues to expand, the outer surface of the inner tube squeezes the arc-shaped stopper 703 at the top and bottom, the first spring 705 stretches, and the arc-shaped stopper 703 moves to the outside of the cavity. When the air pumped into the cavity reaches a set value, the electromagnet 706 is energized, and the electromagnet 706 generates an attraction force on the magnetic block 704, and the magnetic block 704 is adsorbed on the surface of the electromagnet 706. At this time, the arc-shaped stopper 703 is stored in the arc-shaped storage groove 701;

[0051] Stop pumping gas and close the mold for 15-20 minutes. At this time, the inner tube is vulcanized. The lower mold shell 2 and the upper mold shell 3 are driven by the driving mechanism 4 to separate the molds. After separation, the mold cavity and the pump air cavity 805 are in an open state, and the gas in the mold cavity and the pump air cavity 805 is directly discharged to the outside. At this time, the gas in the vulcanized inner tube is automatically discharged through the valve nozzle. Since the valve nozzle is located on the inner side of the lower mold shell 2, the air outlet is far away from the human body, and no manual operation is required for automatic exhaust, thereby achieving the goal of exhausting high-temperature gas in the inner tube without causing harm to the human body, and at the same time improving production efficiency.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. An inner tube vulcanization device, comprising a base (1), characterized in that: A lower mold shell (2) is fixed to the top of the base (1), an upper mold shell (3) is arranged on the top of the lower mold shell (2), and a driving mechanism (4) is arranged on the back of the lower mold shell (2) and the upper mold shell (3), and the driving mechanism (4) drives the upper mold shell (3) and the lower mold shell (2) to close and open the mold; A lower mold cavity (201) and an upper mold cavity (301) are respectively formed at the top of the lower mold shell (2) and the bottom of the upper mold shell (3); after the molds are closed, the cross section of the cavity formed by the lower mold cavity (201) and the upper mold cavity (301) is circular; An air intake assembly (5) is arranged on the outer side of the lower mold cavity (201), and a gas generating device is connected to one side of the air intake assembly (5). After the mold is closed, external gas is dried, degreased and heated by the gas generating device and then enters the mold cavity formed by the lower mold cavity (201) and the upper mold cavity (301) through the air intake assembly (5); A plurality of sets of supporting devices are arranged on both sides of the bottom of the lower mold cavity (201) and on both sides of the top of the upper mold cavity (301), and the inner tube to be vulcanized is placed between the top and bottom supporting devices, thereby preventing the inner tube to be vulcanized from directly contacting the high-temperature side wall of the mold cavity after the mold is opened, thereby avoiding direct contact between the inner tube to be vulcanized and the side wall of the mold cavity, resulting in large-area uneven vulcanization of the inner tube and affecting the quality of the inner tube; The support device comprises an arc-shaped receiving groove (701), a movable cavity (702) and a movable rod, one end of the movable rod is fixed with an arc-shaped stopper (703), the other end of the movable rod is fixed with a magnetic conductive block (704), and a first spring (705) is fixed between the magnetic conductive block (704) and the bottom wall of the movable cavity (702); An electromagnet (706) is fixed to the top wall of the movable cavity (702); when energized, the electromagnet (706) and the magnetic conductive block (704) attract each other, and the arc-shaped stopper (703) is received in the arc-shaped receiving groove (701); A second air bag (802) is fixed to the bottom end of the upper mold shell (3) located inside the upper mold cavity (301), a first air bag (801) is fixed to the top end of the lower mold shell (2) located inside the lower mold cavity (201), a pressure-bearing and air pumping assembly is arranged on the outside of the first air bag (801), the pressure-bearing and air pumping assembly comprises an annular movable block (803) and an annular cavity (603), and the annular movable block (803) is movably arranged in the annular cavity (603); After the mold is closed, the first airbag (801) and the second airbag (802) as well as the upper mold shell (3) and the annular movable block (803) are squeezed against each other, and a pump air cavity (805) is formed between the first airbag (801), the second airbag (802) and the annular movable block (803); A plurality of air inlet holes (6) are provided on the inner side of the lower mold cavity (201), and the air inlet holes (6) are connected to the annular cavity (603). The high-pressure gas in the mold cavity enters the pump air cavity (805) through the air inlet holes (6), and the gas in the pump air cavity (805) inflates the inner tube to be vulcanized through the valve of the inner tube to be vulcanized. The air intake assembly (5) comprises a plurality of air intake branch pipes (501) distributed in an annular pattern, the outer side of the air intake branch pipe (501) is fixedly connected to an annular pipe (502), the side of the annular pipe (502) is fixedly connected to an air intake main pipe (503), and the air intake main pipe (503) is connected to a gas generating device; An elastic sealing pad (804) is fixed to the bottom end of the upper mold shell (3); after the mold is closed, the elastic sealing pad (804) is pressed against the annular movable block (803); The air inlet hole (6) is located on the opposite side of the air inlet component (5); The pressure-bearing and air pumping assembly further comprises a plurality of middle holes (601) formed on the annular movable block (803) and a plurality of side holes (602) formed on the top of the lower mold shell (2) and connected to the air pumping cavity (805). A second spring (806) is fixed between the bottom end of the annular movable block (803) and the bottom wall of the annular cavity (603). After the mold is closed, the middle hole (601) and the side hole (602) are connected.

2. An inner tube vulcanization equipment according to claim 1, characterized in that: The top end of the lower mold shell (2) is formed with an annular outer step surface (202), and the bottom end of the upper mold shell (3) is formed with an annular inner step surface (302), and the annular inner step surface (302) is adapted to the annular outer step surface (202).

3. The inner tube vulcanization equipment according to claim 1, characterized in that: A convex island (203) is formed in the middle of the top end of the lower mold shell (2), and the distance between the top end surface of the lower mold shell (2) and the top end surface of the convex island (203) is 1 / 5-3 / 5 of the radius of the lower mold cavity (201).

4. The inner tube vulcanizing equipment according to claim 2, characterized in that: The top end of the upper mold shell (3) is fixedly connected to a pressure relief pipe (9), and a pressure relief valve is connected to the pipe body of the pressure relief pipe (9).

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