A rear tire inflation device for an electromagnetic tire curing press

Abstract

The application relates to the field of tire vulcanization technology, in particular to a rear inflation device of a tire electromagnetic heating vulcanization machine, which comprises a frame, a box body, two clamping lock assemblies and an axial rigid-flexible conversion assembly; when the clamping lock assembly completes axial locking, the axial rigid-flexible conversion assembly is switched to an axial rigid connection state, so that axial rigid constraint is kept between the upper beam and the frame or between the piston rod and the movable chuck; the axial displacement of the piston rod can be directly limited, the axial reaction force generated by the inflation and expansion of the tire cannot be transmitted to the inside of the power source, the equipment failure rate and the maintenance cost are significantly reduced, the long-term and stable operation of the production line is ensured; and after the inflation and shaping are completed, the axial rigid-flexible conversion assembly is first switched to an axial floating connection state, the residual reaction force of the tire is buffered through a floating stroke, even if the clamping lock assembly is unlocked, the piston rod will not bear the reaction force impact due to the instantaneous loss of support, and the power source is effectively protected from impact damage.

Description

Technical Field

[0001] This invention relates to the field of tire vulcanization technology, specifically to a tire electromagnetic heating vulcanizing machine with a post-inflation device. Background Technology

[0002] The tire electromagnetic heating vulcanizing machine's post-inflation device is mainly used to inflate, cool, and shape tires that have completed the electromagnetic heating vulcanization process when their body temperature is high and their physical and mechanical properties are not yet fully stable. This ensures that the tire maintains precise dimensions and standardized structural form under set pressure and temperature conditions, effectively solidifying the tire's physical properties and structural stability.

[0003] In existing technology, the inflation device of a tire electromagnetic heating vulcanizing machine mainly consists of a frame, a power source, a movable clamping plate, and a fixed clamping plate. The power source (hydraulic cylinder or servo electric cylinder) is fixedly installed on the top of the frame, the movable clamping plate is mounted on the lower end of the power source piston rod, and the fixed clamping plate is correspondingly installed on the bottom of the frame. The working process is as follows: the piston rod is driven by the hydraulic cylinder or servo electric cylinder to move the movable clamping plate vertically, adjusting the distance between the movable and fixed clamping plates to achieve tire clamping and positioning; after the tire is positioned and sealed, high-pressure gas is introduced into the tire to complete the inflation, cooling, and shaping process.

[0004] However, during tire inflation and shaping, the axial reaction force generated by tire expansion is directly transmitted to the piston rod via the moving chuck, and then to the power source. When a hydraulic cylinder is used as the power source, the continuous axial reaction force will constantly compress the cylinder sealing components and cylinder body, easily causing seal wear and hydraulic leakage. When a servo electric cylinder is used as the power source, the axial reaction force will directly act on the lead screw, bearings, and other transmission components, causing them to operate continuously under high load, significantly accelerating the wear rate of the transmission teeth and bearings. Therefore, the power source must simultaneously bear the dual load of driving action and axial reaction force, resulting in rapid equipment wear and a high failure rate, which cannot meet the long-term, stable production needs of tire production lines. To address these shortcomings, we propose a tire electromagnetic heating vulcanizing machine post-inflation device. Summary of the Invention

[0005] The purpose of this invention is to provide a tire inflation device after an electromagnetic heating vulcanizing machine, which solves the problem mentioned in the background art that the axial reaction force generated by tire expansion is transmitted to the inside of the power source.

[0006] This invention is achieved through the following technical solution: a tire electromagnetic heating vulcanizing machine inflation device, comprising a frame, an upper beam at the top of the frame, a power source fixedly mounted on the top surface of the upper beam, a piston rod of the power source moving vertically through the upper beam, and a movable clamping plate at the lower end of the piston rod, and further comprising: The housing is fixedly installed on the bottom surface of the upper beam, and a central hole is provided in the middle of the housing for the piston rod to move through. Two locking assemblies are symmetrically installed on both sides of the housing. The actuators of the two locking assemblies can approach each other to axially lock the piston rod. An axial rigid-flexible conversion assembly is installed between the upper beam and the frame, or between the piston rod and the movable clamping plate; After the locking assembly completes axial locking, the axial rigid-flexible conversion assembly switches to the axial rigid connection state to maintain axial rigid constraint between the upper beam and the frame, or between the piston rod and the moving clamp. When one of the locking components unlocks first, the axial rigid-flexible conversion component switches to the axial floating connection state, so that there is axial floating space between the upper beam and the frame, or between the moving clamp and the telescopic rod.

[0007] In one embodiment, the locking assembly includes a locking plate and a cylinder; the locking plate is slidably connected to the housing; the cylinder is fixedly installed on the outer side wall of the housing, and the actuating end of the cylinder is connected to the locking plate for driving the locking plate to move radially along the piston rod.

[0008] In one embodiment, the outer peripheral wall of the piston rod is provided with a plurality of fixed-distance grooves, each fixed-distance groove being equally spaced along the axial direction of the piston rod; the locking plate is provided with a plurality of fixed-distance locking teeth evenly distributed on the side facing the piston rod; the fixed-distance locking teeth are adapted to the fixed-distance grooves to lock the piston rod axially.

[0009] In one embodiment, a Hall switch is fixedly installed on the side wall of the housing, and the Hall switch is signal-connected to the axial rigid-flexible conversion component; a magnet adapted to the Hall switch is fixedly installed on the actuating end of one of the locking components; when the locking component is locked, the Hall switch and the magnet are aligned to switch the axial rigid-flexible conversion component to an axial rigid connection state; when the locking component is unlocked, the Hall switch and the magnet are misaligned to switch the axial rigid-flexible conversion component to an axial floating connection state.

[0010] In one embodiment, the axial rigid-flexible conversion assembly is disposed between the upper beam and the frame. The axial rigid-flexible conversion assembly includes two connecting plates, which are respectively fixed to both sides of the upper beam. A first guide rod corresponding to each connecting plate is fixed on the frame, and each first guide rod moves vertically through the corresponding connecting plate. A first compression spring is sleeved on each first guide rod, with the lower end of the first compression spring abutting against the corresponding connecting plate and the upper end of the first compression spring abutting against the frame. When no external force is applied, the first compression spring is in a pre-compressed state so that the bottom surface of the connecting plate abuts against the frame.

[0011] In one embodiment, the axial rigid-flexible conversion assembly further includes movable plates corresponding to each connecting plate. Each movable plate is slidably connected to the frame. A push-pull electromagnet, connected to each movable plate, is fixedly installed on the frame. The push-pull electromagnet is used to drive the corresponding movable plate to move horizontally. When the push-pull electromagnet is de-energized, the movable plate separates from the corresponding connecting plate, so that the upper beam and the frame are in an axially floating connection state. When the push-pull electromagnet is energized, the bottom surface of the movable plate abuts against the top surface of the corresponding connecting plate, and the bottom surface of the connecting plate abuts against the frame, so that the upper beam and the frame are in an axially rigid connection state.

[0012] In one embodiment, the movable plate has a first wedge-shaped inclined surface on the side facing the connecting plate, and the connecting plate has a second wedge-shaped inclined surface adapted to the first wedge-shaped inclined surface on the side facing the movable plate.

[0013] In one embodiment, the axial rigidity-flexibility conversion assembly is disposed between the piston rod and the movable clamping plate; the axial rigidity-flexibility conversion assembly includes a movable sleeve movably sleeved at the lower end of the piston rod, and the movable clamping plate is fixedly installed at the lower end of the movable sleeve; an installation cavity is provided inside the piston rod, and a plurality of second guide rods are fixedly installed at the inner bottom of the movable sleeve, each second guide rod extending vertically into the installation cavity, and a limiting plate fixed to each second guide rod is slidably connected in the installation cavity; a second compression spring is sleeved on each second guide rod, the upper end of each second compression spring abutting against the outer bottom wall of the piston rod, and the lower end of the second compression spring abutting against the inner bottom wall of the movable sleeve; when no external force is applied, the second compression spring is in a pre-compressed state so that the limiting plate abuts against the inner bottom wall of the installation cavity.

[0014] In one embodiment, the axial rigid-flexible conversion assembly further includes a rotating electromagnet fixedly installed in the mounting cavity. The actuating end of the rotating electromagnet is fixedly connected to a crossbar, and an arc-shaped hole adapted to the crossbar is opened on the piston rod. The crossbar moves horizontally through the arc-shaped hole. A roller is rotatably connected to the outer end of the crossbar, and a cam inclined surface structure that cooperates with the roller is provided on the upper end face of the movable sleeve. When the rotating electromagnet is de-energized, the roller separates from the cam inclined surface structure, so that the piston rod and the movable clamp are in an axial floating connection state. When the rotating electromagnet is energized, the roller fits into the protruding area of ​​the cam inclined surface structure, and the limiting plate abuts against the inner bottom wall of the mounting cavity, so that the piston rod and the movable clamp are in an axial rigid connection state.

[0015] In one embodiment, a lower beam is fixedly installed at the bottom of the frame, and a fixed clamping plate is fixedly installed on the top surface of the lower beam, with the fixed clamping plate located directly below the movable clamping plate.

[0016] Compared with the prior art, the present invention provides a tire electromagnetic heating vulcanizing machine inflation device, which has the following beneficial effects: 1. By setting two locking components, the present invention can directly restrict the axial displacement of the piston rod, so that the axial reaction force generated by the inflation of the tire is completely borne by the locking components and transmitted to the frame. Therefore, the reaction force cannot be transmitted to the inside of the power source, which significantly reduces the equipment failure rate and maintenance costs, and ensures the long-term and stable operation of the production line.

[0017] 2. By setting up an axial rigid-flexible conversion component, after the locking component completes axial locking, this component switches to an axial rigid connection state, providing a stable axial holding force for the moving chuck and ensuring the tight clamping of the tire by the moving chuck and the fixed chuck; after inflation and shaping, this component first switches to an axial floating connection state, buffering the residual reaction force of the tire through the floating stroke. At this time, even if the locking component is unlocked, the piston rod will not suffer reaction force impact due to instantaneous loss of support, effectively protecting the power source from impact damage.

[0018] 3. By setting up a Hall switch and a magnet, when one of the locking components is activated to unlock, the magnet moves with the locking component and is offset from the Hall switch. The Hall switch immediately sends a signal to trigger the axial rigid-flexible conversion component to switch to a floating connection state. After the reaction force is fully buffered, the other locking component is unlocked, forming an orderly action of buffering first and then fully unlocking. This avoids the risk of reaction force impact caused by timing disorder and further improves the overall reliability and safety of the device. Attached Figure Description

[0019] Figure 1 This is an overall schematic diagram of the unlocked state in Embodiment 1; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 Enlarged view of point B in the middle; Figure 4 This is an overall schematic diagram of the locked state in Embodiment 1; Figure 5 for Figure 4 Enlarged view of point C in the middle; Figure 6 for Figure 4 Enlarged view at point D; Figure 7 This is a schematic diagram of the housing of the present invention; Figure 8 This is an overall schematic diagram of the unlocked state in Embodiment 2; Figure 9 for Figure 8 Enlarged view at point E in the middle; Figure 10This is a schematic diagram of the movable sleeve of the present invention.

[0020] In the diagram: 1. Frame; 2. Upper beam; 3. Power source; 4. Piston rod; 5. Moving clamp; 6. Housing; 7. Locking assembly; 701. Locking plate; 702. Cylinder; 8. Axial rigid-flexible conversion assembly; 801. Connecting plate; 802. First guide rod; 803. First compression spring; 804. Movable plate; 805. Push-pull electromagnet; 806. Movable sleeve; 807. Second guide rod; 808. Limiting plate; 809. Second compression spring; 810. Rotating electromagnet; 811. Crossbar; 812. Roller; 9. Fixed-distance groove; 10. Fixed-distance locking tooth; 11. Hall switch; 12. Magnet; 13. Lower beam; 14. Fixed clamp. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figures 1 to 7 A tire electromagnetic heating vulcanizing machine inflation device includes a frame 1, an upper beam 2 is provided on the top of the frame 1, a power source 3 (optionally a hydraulic cylinder or a servo electric cylinder) is detachably fixed to the top surface of the upper beam 2 by bolts, the piston rod 4 of the power source 3 moves vertically through the upper beam 2, and a movable clamping plate 5 is detachably provided at the lower end of the piston rod 4 by a flange structure.

[0023] In addition, a lower beam 13 is fixedly installed at the bottom of the frame 1. A fixed clamping plate 14 is fixedly installed on the top surface of the lower beam 13 by positioning pins and bolts. The fixed clamping plate 14 is located directly below the movable clamping plate 5, and the clamping surfaces of the two are parallel and aligned to ensure the coaxiality of the clamping of the tire and avoid uneven load on the tire.

[0024] When the vulcanized tire needs to be inflated and shaped, an external robotic arm places the tire to be processed on the clamping surface of the fixed clamping plate 14. The electronic control system sends a command to the power source 3, which drives the piston rod 4 to extend downward, causing the movable clamping plate 5 to descend vertically to the set clamping position, where it cooperates with the fixed clamping plate 14 to press the tire, forming a sealed cavity inside the tire. Subsequently, the inflation line built into the fixed clamping plate 14 introduces gas at a preset pressure into the tire cavity, causing the tire to expand under the pressure and gradually cool and shape. During this process, the axial reaction force generated by the tire expansion is transmitted to the piston rod 4 through the movable clamping plate 5. If there is a lack of restraint, the reaction force will be directly transmitted to the inside of the power source 3, leading to increased wear and tear on the power source 3.

[0025] To solve the above problems, the following design is proposed: This embodiment also includes: a housing 6, two locking assemblies 7, and an axial rigid-flexible conversion assembly 8.

[0026] The housing 6 is fixedly installed on the bottom surface of the upper beam 2 by bolts. A central hole is provided in the middle of the housing 6 for the piston rod 4 to pass through. The piston rod 4 is movably inserted into the central hole.

[0027] Secondly, two locking assemblies 7 are symmetrically installed on the left and right sides of the housing 6. The actuating ends of the two locking assemblies 7 can approach each other to axially lock the piston rod 4. Specifically, the locking assembly 7 includes a locking plate 701 and a cylinder 702. A sliding cavity adapted to the locking plate 701 is provided inside the housing 6. The locking plate 701 is slidably connected inside the housing 6 and can slide radially along the piston rod 4. The cylinder 702 is fixedly installed on the outer wall of the housing 6. The actuating end of the cylinder 702 is connected to the locking plate 701 and is used to drive the locking plate 701 to move radially along the piston rod 4, thereby moving it closer to or away from the piston rod 4.

[0028] Furthermore, the outer peripheral wall of the piston rod 4 is provided with several spaced grooves 9, each spaced at equal intervals along the axial direction of the piston rod 4. The locking plate 701 has several spaced locking teeth 10 evenly distributed on the side facing the piston rod 4; the spaced locking teeth 10 are adapted to the spaced grooves 9 to axially lock the piston rod 4. This embodiment uses the engagement of the spaced locking teeth 10 and the spaced grooves 9 to achieve high-strength axial locking of the piston rod 4, with strong load-bearing capacity, capable of stably withstanding the huge axial reaction force generated by tire inflation and expansion, and will not slip, loosen, or shift under high-pressure conditions, resulting in extremely high locking reliability.

[0029] With the above structure, when the moving clamping plate 5 descends to the set clamping position and the tire is pressed and sealed, the electronic control system sends a command to the cylinders 702 of the two locking assemblies 7; the cylinders 702 drive the locking plate 701 to move towards the piston rod 4 until the fixed-distance locking teeth 10 on the locking plate 701 are engaged in the fixed-distance grooves 9 of the piston rod 4; the two locking assemblies 7 clamp symmetrically to achieve axial locking of the piston rod 4 and restrict its vertical displacement.

[0030] By adopting the above design, two symmetrically arranged locking assemblies 7 form an axial locking structure independent of the power source 3, directly restricting the axial displacement of the piston rod 4. This ensures that the axial reaction force generated by tire inflation is entirely borne by the locking assemblies 7 and transmitted to the frame 1 through the housing 6 and the upper beam 2. The reaction force cannot be transmitted to the seals, lead screws, or bearings inside the power source 3, thus avoiding wear and leakage problems caused by the power source 3 bearing the reaction force for a long time. This significantly reduces the equipment failure rate and maintenance costs, ensuring the long-term and stable operation of the production line.

[0031] In addition, the axial rigid-flexible conversion component 8 is set between the upper beam 2 and the frame 1, or between the piston rod 4 and the movable clamp 5, and can be selected according to the actual installation space and working conditions.

[0032] After the locking assembly 7 completes axial locking, the axial rigid-flexible conversion assembly 8 switches to the axial rigid connection state, so that the upper beam 2 and the frame 1, or the piston rod 4 and the moving clamp 5, maintain axial rigid constraint, provide continuous and uniform axial holding force for the moving clamp 5, and ensure the airtightness of tire clamping.

[0033] When one of the locking components 7 is unlocked, the axial rigid-flexible conversion component 8 switches to the axial floating connection state, so that there is an axial floating space between the upper beam 2 and the frame 1, or between the movable clamp 5 and the telescopic rod, and the residual reaction force of the tire is absorbed and buffered as much as possible through the preset floating space.

[0034] Using the above structure, after the tire is inflated and shaped, one of the cylinders 702 first drives the corresponding locking plate 701 to move in the opposite direction, and the fixed-distance locking tooth 10 disengages from the fixed-distance groove 9, completing the initial unlocking; under this trigger, the axial rigid-flexible conversion component 8 switches to the axial floating connection state, and absorbs and buffers the residual reaction force of the tire as much as possible through the preset floating space; after the reaction force decays to a safe range, the other cylinder 702 drives the corresponding locking plate 701 to unlock, realizing complete unlocking.

[0035] By adopting the above design and through the timing design of "buffering first, then fully unlocking", the axial rigid-flexible conversion component 8 has switched to the axial floating connection state in advance before the double-sided locking components 7 are fully unlocked, and its built-in elastic buffer structure forms a floating buffer channel. At this time, the axial reaction force remaining after the tire is inflated and shaped no longer acts directly on the piston rod 4, but is transmitted to the elastic buffer structure through the moving clamp 5. The deformation of the elastic buffer structure is used to gradually attenuate and release the reaction force, ensuring that the piston rod 4 is always in a buffer support state during the transition stage of single-sided locking unlocking and double-sided not being completely disengaged. It will not suffer concentrated reaction force impact due to the instantaneous loss of all axial constraints, effectively protecting the seals, screws and other components inside the power source 3.

[0036] Conversely, if this timing design is not adopted, and instead the locking components 7 on both sides are unlocked simultaneously, at the moment of unlocking, the fixed-distance locking teeth 10 of the locking plates 701 on both sides will disengage from the fixed-distance grooves 9 of the piston rod 4 at the same time. The piston rod 4 will instantly lose all axial support constraints. At this time, there is still residual inflation pressure inside the tire. The upward axial reaction force generated by it will not be buffered or released in any way and will act directly and centrally on the piston rod 4 and be transmitted to the inside of the power source 3, ultimately causing the power source 3 to fail.

[0037] In one embodiment of this application, the axial rigidity-flexibility conversion assembly 8 is disposed between the upper beam 2 and the frame 1. In this embodiment, the axial rigidity-flexibility conversion assembly 8 includes two connecting plates 801, which are respectively fixed to both sides of the upper beam 2 by bolts. A first guide rod 802 (multiple rods may be provided) corresponding to each connecting plate 801 is fixed on the frame 1. Each first guide rod 802 moves vertically through the corresponding connecting plate 801, allowing the connecting plate 801 to move only up and down. A first compression spring 803 is sleeved on each first guide rod 802. The lower end of the first compression spring 803 abuts against the corresponding connecting plate 801, and the upper end of the first compression spring 803 abuts against the frame 1.

[0038] When no external force is applied, the first compression spring 803 is in a pre-compressed state, and the elastic force continuously presses the connecting plate 801 downward so that the bottom surface of the connecting plate 801 abuts against the frame 1.

[0039] It should be added that the axial rigid-flexible conversion assembly 8 also includes a movable plate 804 corresponding to each connecting plate 801. Each movable plate 804 is slidably connected to the frame 1. A push-pull electromagnet 805 connected to each movable plate 804 is fixedly installed on the frame 1. The push-pull electromagnet 805 is used to drive the corresponding movable plate 804 to move in the horizontal direction, thereby moving closer to or away from the connecting plate 801.

[0040] When the push-pull electromagnet 805 is de-energized, the movable plate 804 separates from the corresponding connecting plate 801, so that the upper beam 2 and the frame 1 are in an axial floating connection state. When the push-pull electromagnet 805 is energized, the bottom surface of the movable plate 804 abuts against the top surface of the corresponding connecting plate 801, and the bottom surface of the connecting plate 801 abuts against the frame 1, so that the upper beam 2 and the frame 1 are in an axially rigid connection state.

[0041] It is worth mentioning that the movable plate 804 has a first wedge-shaped inclined surface on the side facing the connecting plate 801, and the connecting plate 801 has a second wedge-shaped inclined surface on the side facing the movable plate 804 that matches the first wedge-shaped inclined surface. During the initial pressing and clamping of the tire, the piston rod 4 has not yet been locked by the locking assembly 7, and the axial rigid-flexible conversion assembly 8 is still in an axial floating connection state. At this time, the moving chuck 5 may move slightly upward due to the initial support reaction force of the tire, tire deformation, etc., which may result in insufficient tire clamping preload.

[0042] By engaging the first and second wedge-shaped inclined surfaces, after the locking assembly 7 locks the piston rod 4, the push-pull electromagnet 805 drives the movable plate 804 to move horizontally towards the connecting plate 801. The two wedge-shaped inclined surfaces first contact and form a guiding engagement. Utilizing the mechanical properties of the wedge structure, the horizontal pushing force of the movable plate 804 is converted into a vertically downward preload, pushing the connecting plate 801 downwards against the elastic force of the first compression spring 803. This downward movement is transmitted sequentially through the upper beam 2, the housing 6, the locking assembly 7, and the piston rod 4 to the movable clamping plate 5, causing it to move downwards a small distance, achieving secondary compression of the tire. This design not only allows the movable plate 804 to smoothly engage even with initial floating deviations, but also compensates for the initial upward deviation through secondary compression, significantly increasing the clamping pressure of the movable clamping plate 5 on the tire and further enhancing the sealing of the tire's inner cavity.

[0043] In this embodiment, before the locking assembly 7 is locked, the push-pull electromagnet 805 is in a de-energized state, the movable plate 804 is separated from the connecting plate 801, and the upper beam 2 can float slightly along the first guide rod 802, which facilitates the movement of the clamp 5 to fit the tire. After the locking assembly 7 is locked, the push-pull electromagnet 805 is energized and drives the movable plate 804 to move horizontally toward the connecting plate 801. The first wedge-shaped inclined surface of the movable plate 804 contacts and slides relative to the second wedge-shaped inclined surface of the connecting plate 801. Utilizing the guiding effect of the wedge structure, the connecting plate 801 is driven to move slightly downward against the elastic force of the first compression spring 803 until the bottom surface of the connecting plate 801 is tightly fitted with the supporting surface of the frame 1, and the bottom surface of the movable plate 804 is completely abutted against the top surface of the connecting plate 801, thus achieving an axial rigid connection between the upper beam 2 and the frame 1.

[0044] After the tire is inflated and shaped, one of the locking components 7 is unlocked, the push-pull electromagnet 805 is de-energized, the movable plate 804 is automatically reset and separated from the connecting plate 801; the connecting plate 801 can float vertically along the first guide rod 802 under the elastic force of the first compression spring 803, and the upper beam 2 and the frame 1 are switched to the axial floating connection state to buffer the residual reaction force of the tire. After the reaction force is buffered, another locking component 7 is unlocked, and the power source 3 drives the piston rod 4 to move the moving clamp 5 upward, completing the tire removal.

[0045] In this embodiment, under the axial floating connection state, the elastic floating stroke of the first compression spring 803 can fully absorb the residual reaction force of the tire. Even if the locking assembly 7 is unlocked, the piston rod 4 will not be subjected to the reaction force impact due to instantaneous loss of support, effectively protecting the power source 3 from impact damage. At the same time, the structural layout is reasonable, making full use of the installation space between the upper beam 2 and the frame 1, and adapting to the modification needs of existing equipment.

[0046] Example 2: Please refer to Figures 7 to 10 This embodiment also proposes a tire electromagnetic heating vulcanizing machine inflation device. The difference between this embodiment and Embodiment 1 is that: An axial stiffness-flexibility conversion assembly 8 is disposed between the piston rod 4 and the movable clamping plate 5. In this embodiment, the axial stiffness-flexibility conversion assembly 8 includes a movable sleeve 806 movably sleeved at the lower end of the piston rod 4, and the movable clamping plate 5 is fixedly installed at the lower end of the movable sleeve 806 via a flange structure. An installation cavity is provided inside the piston rod 4, and a plurality of second guide rods 807 are fixedly installed at the inner bottom of the movable sleeve 806. Each second guide rod 807 extends vertically into the installation cavity, and a limiting plate 808 fixed to each second guide rod 807 is slidably connected in the installation cavity, so that the movable sleeve 806 can only move along the axial direction of the piston rod 4, avoiding wobbling.

[0047] A second compression spring 809 is fitted onto each of the second guide rods 807. The upper end of each second compression spring 809 abuts against the outer bottom wall of the piston rod 4, and the lower end of each second compression spring 809 abuts against the inner bottom wall of the movable sleeve 806. When no external force is applied, the second compression spring 809 is in a pre-compressed state, and pushes the movable sleeve 806 downward through elastic force so that the limiting plate 808 abuts against the inner bottom wall of the mounting cavity.

[0048] It should be added that the axial rigid-flexible conversion assembly 8 also includes a rotating electromagnet 810 fixedly installed in the mounting cavity. A crossbar 811 is fixedly connected to the actuating end of the rotating electromagnet 810. An arc-shaped hole adapted to the crossbar 811 is provided on the piston rod 4, and the crossbar 811 moves horizontally through the arc-shaped hole. A roller 812 is rotatably connected to the outer end of the crossbar 811. A cam inclined surface structure that cooperates with the roller 812 is provided on the upper end face of the movable sleeve 806. The cooperation function of this cam inclined surface structure with the roller 812 is consistent with the cooperation function of the aforementioned first wedge-shaped inclined surface and second wedge-shaped inclined surface; both can adaptively compensate for the positional deviation in the initial clamping stage, driving the moving chuck 5 to generate a downward compensation stroke, thereby achieving secondary clamping of the tire.

[0049] When the rotating electromagnet 810 is de-energized, the roller 812 separates from the cam inclined surface structure, so that the piston rod 4 and the moving chuck 5 are in an axial floating connection state. When the rotating electromagnet 810 is energized, the roller 812 fits against the protruding area of ​​the cam inclined structure, and the limiting plate 808 abuts against the inner bottom wall of the mounting cavity, so that the piston rod 4 and the moving clamp 5 are in an axially rigid connection state.

[0050] In this embodiment, before the locking assembly 7 is locked, the rotating electromagnet 810 is de-energized, the roller 812 is separated from the cam inclined surface structure on the upper end of the movable sleeve 806, the movable sleeve 806 is kept in a downward extended state under the elastic force of the second compression spring 809, and the movable clamp 5 can float slightly with the movable sleeve 806 to facilitate contact with the tire.

[0051] After the locking assembly 7 is locked, the rotating electromagnet 810 is energized and drives the crossbar 811 to rotate around its axis; the crossbar 811 drives the roller 812 to move along the arc-shaped hole, the roller 812 contacts the protruding area of ​​the cam inclined surface structure and rolls relative to it, and uses the thrust of the cam inclined surface to drive the movable sleeve 806 to overcome the elastic force of the second clamping spring 809 and move upward until the limiting plate 808 is tightly fitted with the inner bottom wall of the mounting cavity, realizing the axial rigid connection between the piston rod 4 and the movable clamping plate 5.

[0052] After the tire is inflated and shaped, one of the locking components 7 unlocks, the rotating electromagnet 810 is de-energized and drives the crossbar 811 to rotate in the opposite direction, and the roller 812 separates from the protruding area of ​​the cam inclined structure. The movable sleeve 806 moves downward to reset under the elastic force of the second compression spring 809, and the piston rod 4 and the movable clamp 5 switch to an axial floating connection state, and the residual reaction force of the tire is buffered by the elastic deformation of the second compression spring 809.

[0053] After the reaction force is buffered, another locking component 7 is unlocked, and the power source 3 drives the piston rod 4 to rise, which in turn drives the moving clamp 5 to rise synchronously, completing the tire removal.

[0054] This embodiment has a compact structure and can be directly integrated between the piston rod 4 and the movable clamping plate 5 without occupying additional space between the frame 1 and the upper beam 2, making it suitable for working conditions with limited installation space. In the rigid connection state, the roller 812 and the cam inclined surface cooperate to provide axial holding force to the movable clamping plate 5, ensuring the tire clamping seal. At the same time, the guiding effect of the cam inclined surface can automatically compensate for the slight deviation of the movable clamping plate 5, improving the sealing effect. In the floating connection state, the elastic stroke of the second compression spring 809 can buffer the residual reaction force of the tire, avoid the reaction force impact at the moment of unlocking, and protect the power source 3 and the locking assembly 7.

[0055] In some embodiments of this application, a Hall switch 11 is fixedly installed on the side wall of the housing 6. The Hall switch 11 is signal-connected to the axial rigid-flexible conversion component 8 (push-pull electromagnet 805 or rotary electromagnet 810) to trigger the rigid-flexible state switching. A magnet 12 adapted to the Hall switch 11 is fixedly installed at the execution end of one of the locking components 7. The magnet 12 moves synchronously with the locking plate 701 to achieve alignment or offset with the Hall switch 11.

[0056] When the locking assembly 7 is locked, the Hall switch 11 is aligned with the magnet 12 so that the axial rigid-flexible conversion assembly 8 switches to the axial rigid connection state. When the locking assembly 7 is unlocked, the Hall switch 11 is disengaged from the magnet 12, so that the axial rigid-flexible conversion assembly 8 switches to the axial floating connection state.

[0057] In this embodiment, when the fixed-distance locking teeth 10 in the locking assembly 7 are engaged in the fixed-distance groove 9, the magnet 12 on the locking plate 701 is aligned with the Hall switch 11 on the housing 6. After the Hall switch 11 detects the magnet signal, it immediately sends a control signal to the axial rigid-flexible conversion assembly 8 (push-pull electromagnet 805 or rotary electromagnet 810) to trigger it to switch to the axial rigid connection state. When the cylinder 702 in the locking assembly 7 drives the locking plate 701 to move in the opposite direction, the magnet 12 moves synchronously with the locking plate 701 and is offset from the Hall switch 11. The Hall switch 11 immediately sends a signal to the axial rigid-flexible conversion assembly 8, triggering it to switch to the axial floating connection state. After the axial rigid-flexible conversion component 8 completes the floating switch and the residual reaction force of the tire is fully buffered, the electronic control system controls another locking component 7 to unlock, thus achieving an orderly sequence of "buffering first and then fully unlocking".

[0058] This embodiment enables the linkage between the locking assembly 7 and the axial rigid-flexible conversion assembly 8 without complex electrical control programming. It directly triggers state switching based on the mechanical position of the locking assembly 7, ensuring synchronization between rigid connection and locking action, and between floating switching and initial unlocking action. Furthermore, the Hall switch 11 and magnet 12 employ a non-contact triggering design, providing strong anti-interference capabilities, adaptability to the harsh working conditions of vulcanizing machines with high temperatures, high pressures, and high dust levels, and a long service life.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tire electromagnetic heating vulcanizing machine inflation device, comprising a frame, an upper beam at the top of the frame, a power source fixedly mounted on the top surface of the upper beam, a piston rod of the power source moving vertically through the upper beam, and a movable clamping plate at the lower end of the piston rod, characterized in that, Also includes: The housing is fixedly installed on the bottom surface of the upper beam, and a central hole is provided in the middle of the housing for the piston rod to move through. Two locking assemblies are symmetrically installed on both sides of the housing. The actuators of the two locking assemblies can approach each other to axially lock the piston rod. An axial rigid-flexible conversion assembly is installed between the upper beam and the frame, or between the piston rod and the movable clamping plate; After the locking assembly completes axial locking, the axial rigid-flexible conversion assembly switches to the axial rigid connection state to maintain axial rigid constraint between the upper beam and the frame, or between the piston rod and the moving clamp. When one of the locking components unlocks first, the axial rigid-flexible conversion component switches to the axial floating connection state, so that there is axial floating space between the upper beam and the frame, or between the moving clamp and the telescopic rod.

2. The tire vulcanizing machine inflation device according to claim 1, characterized in that: The locking assembly includes a locking plate and a cylinder; The locking plate is slidably connected to the housing; the cylinder is fixedly installed on the outer wall of the housing, and the actuator end of the cylinder is connected to the locking plate to drive the locking plate to move radially along the piston rod.

3. The tire vulcanizing machine inflation device according to claim 2, characterized in that: The outer peripheral wall of the piston rod is provided with several fixed-distance grooves, and each fixed-distance groove is distributed at equal intervals along the axial direction of the piston rod. The locking plate has several spaced locking teeth evenly distributed on the side facing the piston rod; the spaced locking teeth are adapted to the spaced grooves to axially lock the piston rod.

4. The tire vulcanizing machine inflation device according to claim 1, characterized in that: A Hall switch is fixedly installed on the side wall of the housing, and the Hall switch is signal-connected to the axial rigid-flexible conversion component; a magnet adapted to the Hall switch is fixedly installed at the actuation end of one of the locking components. When the locking assembly is locked, the Hall switch aligns with the magnet to switch the axial rigid-flexible conversion assembly to the axial rigid connection state. When the locking assembly is unlocked, the Hall switch is decoupled from the magnet, causing the axial rigid-flexible conversion assembly to switch to the axial floating connection state.

5. The tire vulcanizing machine inflation device according to claim 1 or 4, characterized in that: The axial rigid-flexible conversion component is disposed between the upper beam and the frame. The axial rigid-flexible conversion component includes two connecting plates, which are respectively fixed to both sides of the upper beam. A first guide rod is fixed on the frame, corresponding to each connecting plate. Each first guide rod moves vertically through the corresponding connecting plate. A first compression spring is sleeved on each first guide rod. The lower end of the first compression spring abuts against the corresponding connecting plate, and the upper end of the first compression spring abuts against the frame. When no external force is applied, the first compression spring is in a pre-compressed state so that the bottom surface of the connecting plate abuts against the frame.

6. The tire vulcanizing machine inflation device according to claim 5, characterized in that: The axial rigid-flexible conversion assembly also includes movable plates corresponding to each connecting plate. Each movable plate is slidably connected to the frame. A push-pull electromagnet connected to each movable plate is fixedly installed on the frame. The push-pull electromagnet is used to drive the corresponding movable plate to move in the horizontal direction. When the push-pull electromagnet is de-energized, the movable plate separates from the corresponding connecting plate, so that the upper beam and the frame are in an axial floating connection state. When the push-pull electromagnet is energized, the bottom surface of the movable plate abuts against the top surface of the corresponding connecting plate, and the bottom surface of the connecting plate abuts against the frame, so that the upper beam and the frame are in an axially rigid connection state.

7. The tire vulcanizing machine inflation device according to claim 6, characterized in that: The movable plate has a first wedge-shaped inclined surface on the side facing the connecting plate, and the connecting plate has a second wedge-shaped inclined surface on the side facing the movable plate that matches the first wedge-shaped inclined surface.

8. The tire vulcanizing machine inflation device according to claim 1 or 4, characterized in that: The axial rigid-flexible conversion assembly is disposed between the piston rod and the movable clamping plate; the axial rigid-flexible conversion assembly includes a movable sleeve movably sleeved at the lower end of the piston rod, and the movable clamping plate is fixedly installed at the lower end of the movable sleeve; An installation cavity is provided inside the piston rod. Several second guide rods are fixedly installed at the bottom of the movable sleeve. Each second guide rod extends vertically into the installation cavity. A limiting plate fixed to each second guide rod is slidably connected in the installation cavity. A second compression spring is fitted on each second guide rod. The upper end of each second compression spring abuts against the outer bottom wall of the piston rod, and the lower end of the second compression spring abuts against the inner bottom wall of the movable sleeve. When no external force is applied, the second compression spring is in a pre-compressed state so that the limiting plate abuts against the inner bottom wall of the mounting cavity.

9. The tire vulcanizing machine inflation device according to claim 8, characterized in that: The axial rigid-flexible conversion assembly also includes a rotating electromagnet fixedly installed in the mounting cavity. The actuating end of the rotating electromagnet is fixedly connected to a crossbar, and an arc-shaped hole adapted to the crossbar is opened on the piston rod. The crossbar moves horizontally through the arc-shaped hole. A roller is rotatably connected to the outer end of the crossbar, and a cam inclined surface structure that cooperates with the roller is provided on the upper end face of the movable sleeve; When the rotating electromagnet is de-energized, the roller separates from the cam inclined plane structure, so that the piston rod and the moving chuck are in an axial floating connection state; When the rotating electromagnet is energized, the rollers fit into the raised area of ​​the cam inclined structure, and the limiting plate abuts against the inner bottom wall of the mounting cavity, so that the piston rod and the moving clamp are in an axially rigid connection state.

10. The tire vulcanizing machine inflation device according to claim 1, characterized in that: A lower beam is fixedly installed at the bottom of the frame, and a fixed clamping plate is fixedly installed on the top surface of the lower beam, with the fixed clamping plate located directly below the movable clamping plate.

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