Aluminum alloy wheel heat treatment furnace feeding and discharging trolley

Abstract

The present application relates to the technical fields of aluminum alloy wheel heat treatment, and discloses an aluminum alloy wheel heat treatment furnace feeding and discharging trolley, which comprises a trolley body and a separable heat-resistant rack. The heat-resistant rack is provided with a supporting shaft, a thermal expansion ring, a clamping block and a heat-sensitive release mechanism. At normal temperature, the clamping block clamps the outer periphery of the wheel hub to realize positioning; at high temperature, the thermal expansion ring expands radially to clamp the inner hole of the wheel hub, and at the same time, the heat-sensitive release mechanism automatically drives the clamping block to open to release the constraint on the outer periphery, so that the outer diameter of the wheel hub can expand freely, and thermal stress deformation is avoided. The heat-resistant rack is also integrated with jet cleaning and rotary cleaning functions to realize automatic cleaning of the inner and outer peripheries of the wheel hub during the loading stage. The present application realizes automatic switching of cold and hot state clamping, has simple structure and high reliability, and effectively improves the heat treatment quality of aluminum alloy wheels.

Description

Technical Field

[0001] This invention belongs to the technical field of heat treatment of aluminum alloy wheels, and more specifically, it relates to a feeding and discharging trolley for a heat treatment furnace of aluminum alloy wheels. Background Technology

[0002] Aluminum alloy wheels require heat treatment processes such as solution treatment and aging during manufacturing to improve their mechanical properties and microstructure. Heat treatment is usually carried out in a dedicated furnace. The wheel hub is loaded onto a material rack, and a material loading and unloading trolley sends the rack and wheel hub into the furnace. After heating and holding at that temperature, the wheels are pulled out and cooled.

[0003] The existing heat treatment technology for aluminum alloy wheels still has the following drawbacks: First, the existing wheel hub heat treatment rack still maintains a rigid clamp on the outer periphery of the wheel hub during the high-temperature stage in the furnace, which restricts the free thermal expansion of the wheel hub and easily leads to thermal stress, deformation or even cracking of the wheel hub.

[0004] Secondly, in the existing technology, in order to improve the heat treatment effect of the wheel hub, it is usually necessary to loosen the clamps on the outer periphery of the wheel hub. If the outer periphery clamps are loosened before entering the furnace, the wheel hub is easily shaken and displaced by the airflow or vibration in the furnace, which affects the heating uniformity and positioning stability.

[0005] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided an aluminum alloy wheeled heat treatment furnace loading and unloading trolley in order to achieve a more practical and valuable purpose. Summary of the Invention

[0006] This invention provides a material feeding and discharging trolley for an aluminum alloy wheel heat treatment furnace, which overcomes the above-mentioned defects in the prior art.

[0007] The purpose and effect of the aluminum alloy wheel heat treatment furnace loading and unloading trolley of this invention are achieved by the following specific technical means: A material loading / unloading trolley for an aluminum alloy wheel heat treatment furnace includes a trolley body and a heat-resistant material rack. The heat-resistant material rack is detachably mounted from the trolley body and is used to support the wheel hub and move it in and out of the furnace. The heat-resistant material rack has an L-shaped structure, including a vertical section and a horizontal section, and further includes: A support shaft is provided at the vertical part of the heat-resistant material rack and is used to pass through the inner hole of the hub; A thermal expansion ring is fitted around the outer periphery of the support shaft and is used to expand radially when heated to clamp the inner hole of the hub. A clamping block is movably disposed on the flat part of the heat-resistant material rack for clamping the outer periphery of the wheel hub at room temperature; A heat-sensitive release mechanism is disposed on the heat-resistant material rack and cooperates with the clamping block to drive the clamping block to release the clamping block from the outer periphery of the wheel hub when heated.

[0008] A further technical solution includes a groove on the flat part of the heat-resistant material rack, a slider slidingly disposed within the groove, a clamping block fixed to the upper side of the slider, a movable block fixed to the lower side of the slider, a clearance groove on the lower side of the flat part of the heat-resistant material rack, and the lower end of the movable block extending into the clearance groove; the thermal release mechanism includes a first thermal expansion member, a frame, a push rod, a slider, and a return spring. The first thermal expansion member is disposed within the frame, the push rod is disposed on both sides of the first thermal expansion member, the slider is slidably disposed on both sides of the groove, the push rod cooperates with the slider, the slider has a protrusion, the slider has slots on both sides, the protrusion cooperates with the slots in a one-way limiting manner, and the return spring is connected between the movable block and one end of the groove; when the first thermal expansion member expands due to heat, it pushes the slider to move through the push rod, causing the protrusion to disengage from the slot, and the return spring drives the slider and the clamping block away from the hub.

[0009] In a further technical solution, one side of the protrusion contacts the inclined surface of one side wall of the slot, and the other side of the protrusion contacts the flat surface of the other side wall of the slot. A first spring is respectively connected between the two ends of the frame and the two sliders. The first spring is used to keep the protrusion part located in the slot.

[0010] In a further technical solution, the support shaft is rotatably mounted on the vertical part of the heat-resistant material rack. The outer circumference of the support shaft is provided with a plurality of first annular grooves. The thermal expansion ring is sleeved in the first annular groove. A circumferential fixing structure is provided between the thermal expansion ring and the support shaft. The outer circumference of the thermal expansion ring is provided with a plurality of second annular grooves. The second annular grooves are used to provide deformation space when the thermal expansion ring is heated and expanded.

[0011] A further technical solution includes an operating rod fixedly mounted on one end of the support shaft, a disc fixedly mounted on the outer circumference of one end of the support shaft, a bearing between the outer circumference of the disc and the vertical part of the heat-resistant material rack, the support shaft being rotatably mounted on the vertical part of the heat-resistant material rack via the bearing, and the other end of the support shaft being suspended; a vent hole is provided inside the disc, and multiple limiting grooves are opened on the outer circumference of the disc; a limiting component is provided inside the vertical part of the heat-resistant material rack, the limiting component including a housing, a limiting member, a second thermal expansion member, and a second spring, the limiting member being slidably mounted inside the housing, the second thermal expansion member and the second spring being connected between one side of the limiting member and the housing, the second thermal expansion member expanding under heat pushing the limiting member into the limiting groove to lock the rotation of the support shaft.

[0012] A further technical solution includes a soft pad on the upper arc surface of the clamping block, with multiple grooves spaced apart on the inner arc surface of the soft pad, and multiple channels inside the clamping block, each channel corresponding to one of the grooves, with one end of each channel communicating with a corresponding groove; one end of the slider is provided with a round tube, one end of which extends into the flat portion of the heat-resistant material rack, and the interior of the round tube communicates with the multiple channels sequentially through the interior of the slider and the interior of the clamping block, and the round tube communicates with the flat portion of the heat-resistant material rack, so that gas is ejected from the grooves to clean the outer periphery of the wheel hub.

[0013] A further technical solution is provided with a cleaning element at the arc-shaped upper end of the soft pad, and a pair of cleaning parts are provided at intervals on the outer periphery of the cleaning element. The cleaning element is used to contact the outer periphery of the wheel hub for mechanical cleaning, and when clamped, it works together with the soft pad to apply a clamping force to the outer periphery of the wheel hub.

[0014] A further technical solution is provided in the bottom plate of the trolley body, which is equipped with a bidirectional telescopic rod and an air pump. Each end of the bidirectional telescopic rod is provided with a push block. The upper end of the push block extends into the clearance groove and cooperates with the movable block to drive the clamping block to move. A connecting valve is provided on the lower side of the flat part of the heat-resistant material rack, and a telescopic connecting pipe is provided between the air pump and the connecting valve.

[0015] A further technical solution includes a pair of first guide rails on the upper side of the bottom plate of the trolley body, on which the flat part of the heat-resistant material rack slides; a pair of second guide rails are provided on the lower side of the interior of the furnace body, corresponding to the first guide rails, for the heat-resistant material rack to slide from the trolley body into the furnace body; a drive telescopic rod is also provided on the upper side of the bottom plate of the trolley body, the extended end of the drive telescopic rod being detachably connected to the connecting end of the flat part of the heat-resistant material rack, for pushing the heat-resistant material rack to move.

[0016] A further technical solution is provided in which an air passage is provided inside the support shaft, and multiple sets of purging components are provided on the outer periphery of the support shaft. The nozzles in the purging components are connected to the air passage for purging the inside of the hub. The vertical part of the heat-resistant material rack is connected to the inside of the support shaft through the inside of the disc to supply air to the air passage.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves automatic switching between hot and cold states in the wheel hub clamping method by fitting a thermal expansion ring around the outer circumference of the support shaft and incorporating a thermosensitive release mechanism that cooperates with the clamping block. At room temperature, the clamping block holds the outer circumference of the wheel hub, ensuring the wheel hub remains stable during loading, transfer, and insertion into the furnace, preventing rolling or displacement. When the heat-resistant material rack enters the furnace with the wheel hub and heats up, the thermal expansion ring expands radially due to heat, forming an interference fit with the inner hole of the wheel hub, providing stable radial support from within. Simultaneously, the first thermal expansion component in the thermosensitive release mechanism expands due to heat, pushing the slide member to move via a push rod, releasing the slide member's unidirectional restriction on the slider. The return spring drives the clamping block to move away from the wheel hub, thereby releasing the clamping of the outer circumference of the wheel hub. Thus, the outer diameter of the wheel hub can expand freely at high temperatures, avoiding deformation and cracking caused by thermal stress concentration due to rigid clamping of the outer circumference. Furthermore, the wheel hub is reliably fixed in the furnace by the thermal expansion ring, preventing wobbling or rotation, ensuring heating uniformity and positioning stability, and significantly improving the heat treatment quality of aluminum alloy wheels.

[0018] This invention integrates the jet cleaning function into the clamping block. A soft pad is provided on the upper arc surface of the clamping block, and multiple grooves are spaced apart on the inner arc surface of the soft pad. The internal channel of the clamping block communicates with these grooves and is connected to an air source via a circular pipe. During the loading and cleaning stage, the clamping block approaches the outer circumference of the hub, and gas is ejected from the grooves. Simultaneously, the hub can rotate on the support shaft, achieving a 360° purging cleaning of the outer circumference of the hub. This effectively removes oxide scale, chips, and dust, improving surface cleanliness and reducing furnace contamination. Furthermore, the protrusion on the slider and the slots on both sides of the slider form a one-way limiting structure. One side of the protrusion contacts the inclined surface of the slot, and the other side contacts the flat surface of the slot. This ensures that after the clamping block is clamped, it can only move towards the hub and cannot move backward. Therefore, even after the push block and the moving block disengage, the clamping force on the hub is maintained, ensuring that the hub does not loosen during the process of pushing the heat-resistant material rack into the furnace body, thus improving system safety and reliability.

[0019] This invention designs the heat-resistant material rack and the trolley body as a separable structure, and sets a disc and limiting component at one end of the support shaft. At high temperatures, the second thermal expansion component expands due to heat, pushing the limiting component into the limiting groove of the disc, locking the support shaft, preventing it from rotating during heat treatment, avoiding relative friction between the hub and the thermal expansion ring, ensuring stable clamping, and reducing wear and contamination. At the same time, the drive telescopic rod and the first guide rail on the trolley body cooperate with the second guide rail inside the furnace, allowing the heat-resistant material rack to slide smoothly from the first guide rail into the second guide rail and into the furnace body. Subsequently, the drive telescopic rod disengages from the heat-resistant material rack, leaving the drive, air source, and other heat-sensitive components outside the furnace on the trolley body, allowing only the heat-resistant material rack to withstand the high temperature inside the furnace. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a schematic diagram of the first isometric structure of the present invention; Figure 2 This is a schematic diagram of the second isometric structure of the present invention; Figure 3 This is a schematic diagram of the first isometric structure of the trolley body and the furnace body in this invention; Figure 4 This is a schematic diagram of the second isometric structure of the trolley body and the furnace body in this invention; Figure 5 This is an isometric structural diagram of the clamping block in this invention; Figure 6 This is a front view structural diagram of the present invention; Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point AA; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point D; Figure 9 for Figure 7 A magnified schematic diagram of the local structure at point E; Figure 10 for Figure 6 Schematic diagram of the cross-sectional structure at point BB; Figure 11 for Figure 10 A magnified schematic diagram of the local structure at point F; Figure 12 This is a top view of the structure of the present invention; Figure 13 for Figure 12 Schematic diagram of the cross-sectional structure at the CC section; Figure 14 for Figure 13 A magnified schematic diagram of the structure at point G in the middle.

[0023] Explanation of reference numerals in the attached figures: 10. Cart body, 11. Heat-resistant material rack, 12. Drive telescopic rod, 13. First guide rail, 14. Second guide rail, 15. Furnace body, 16. Support shaft, 17. First annular groove, 18. Thermal expansion ring, 19. Operating rod, 20. Slide groove, 21. Clamping block, 22. Soft pad, 23. Groove, 24. Round tube, 25. Movable block, 26. Cleaning component, 27. Cleaning part, 28. Return spring, 29. Bidirectional telescopic rod, 30. Push block, 31. Air pump, 32. Connecting valve, 33. Telescopic connecting pipe, 34. Channel, 35. Slot, 36. Sliding component, 37. Protrusion, 38. Frame, 39. First thermal expansion component, 40. First spring, 41. Push rod, 42. Second annular groove, 43. Spray hole, 44. Disc, 45. Bearing, 46. Housing, 47. Limiting component, 48. Second thermal expansion component, 49. Second spring, 50. Limiting groove, 51. Avoidance groove, 52. Vent hole, 53. Detailed Implementation

[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0025] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] As attached Figure 1 To be continued Figure 14 As shown: This invention provides an embodiment of a material feeding and discharging trolley for an aluminum alloy wheel heat treatment furnace. See attached document Figure 1 To be continued Figure 4 It includes a trolley body 10, and a heat-resistant material rack 11 is slidably provided on the upper side of the bottom plate of the trolley body 10. The heat-resistant material rack 11 has an L-shaped structure, including a vertical part and a horizontal part.

[0028] Preferred options are shown in the appendix. Figure 1 To be continued Figure 4 Appendix Figure 9 The heat-resistant material rack 11 has multiple support shafts 16 rotatably mounted on its vertical section. Each support shaft 16 has multiple first annular grooves 17 spaced apart on its outer circumference. A thermal expansion ring 18 is fitted inside each first annular groove 17. The inner circumference of the thermal expansion ring 18 is circumferentially fixed to the support shaft 16 by a key or interference fit, ensuring that the support shaft 16 can drive the thermal expansion ring 18 to rotate synchronously when it rotates. The outer circumference of the thermal expansion ring 18 has multiple second annular grooves 43 spaced apart. The second annular grooves 43 provide deformation space when the thermal expansion ring 18 expands due to heat, improving clamping stability. The outer circumference of the support shaft 16 is provided with multiple sets of purging assemblies. Each set of purging assemblies includes multiple pairs of nozzles 44. The two nozzles of each pair of nozzles 44 are located at the axial ends of the corresponding thermal expansion ring 18 and are both inclined towards the thermal expansion ring 18.

[0029] Preferred options are shown in the appendix. Figure 5 Appendix Figure 12 To be continued Figure 14 The heat-resistant material rack 11 has multiple pairs of sliding grooves 20 on its flat surface. A slider 21 slides within each groove 20. A clamping block 22 is fixedly mounted on the upper side of the slider 21. A soft pad 23 is provided on the upper arc surface of the clamping block 22. Multiple grooves 24 are spaced apart on the inner arc surface of the soft pad 23. Multiple channels 35 are provided inside the clamping block 22, and each channel 35 corresponds to one of the grooves 24. One end of each channel 35 is connected to a corresponding groove 24. A circular tube 25 is provided at one end of the slider 21. One end of the circular tube 25 extends into the flat surface of the heat-resistant material rack 11. A heat-resistant sealing ring is provided between the outer circumference of the circular tube 25 and the flat surface of the heat-resistant material rack 11 to achieve a sliding sealing connection. The interior of the circular tube 25 communicates with the multiple channels 35 sequentially through the interior of the slider 21 and the interior of the clamping block 22, and the circular tube 25 is also connected to the interior of the flat surface of the heat-resistant material rack 11. The soft pad 23 has a cleaning element 27 at its curved upper end, and a pair of cleaning parts 28 are spaced apart on the outer periphery of the cleaning element 27.

[0030] Preferred options are shown in the appendix. Figure 10 Appendix Figure 11The slider 21 has multiple one-way limiting slots 36 spaced apart on both sides. A slider 37 is slidably mounted on each side of the slide groove 20. Multiple one-way limiting protrusions 38 are spaced apart on the side of a pair of sliders 37 that are close to each other. One side of the protrusion 38 contacts the inclined surface of one side wall of the slot 36, and the other side of the protrusion 38 contacts the flat surface of the other side wall of the slot 36. A connecting assembly is provided between one end of a pair of sliders 37. The connecting assembly includes a frame 39 connected within the slide groove 20. A first spring 41 is connected between each end of the frame 39 and one of the two sliders 37. A first thermal expansion member 40 is provided inside the frame 39. A push rod 42 is provided on each side of the first thermal expansion member 40. The push rod 42 engages with the slider 37 via a guide groove. The push rod 42 slides within the frame 39 and pushes the corresponding slider 37 to move.

[0031] Preferred options are shown in the appendix. Figure 14 The heat-resistant material rack 11 has two pairs of clearance grooves 52 on the lower side of its flat part. The slider 21 has a movable block 26 fixedly installed on its lower side. The lower end of the movable block 26 extends into the corresponding clearance groove 52. A return spring 29 is connected between one side of the movable block 26 and one end of the slide groove 20.

[0032] Preferred options are shown in the appendix. Figure 12 To be continued Figure 14 The bottom plate of the trolley body 10 is equipped with a pair of bidirectional telescopic rods 30 and an air pump 32. Each end of the bidirectional telescopic rod 30 has a push block 31, the upper end of which extends into the corresponding clearance groove 52. A connecting valve 33 is located on the lower side of the flat portion of the heat-resistant material rack 11, and a telescopic connecting pipe 34 connects the air pump 32 and the connecting valve 33. The upper side of the bottom plate of the trolley body 10 is equipped with a pair of first guide rails 13 and a drive telescopic rod 12. The flat portion of the heat-resistant material rack 11 slides on the pair of first guide rails 13, and the extended end of the drive telescopic rod 12 is detachably connected to the connecting end of the flat portion of the heat-resistant material rack 11.

[0033] Preferred options are shown in the appendix. Figure 1 Appendix Figure 2 Appendix Figure 8An operating lever 19 is fixedly mounted on one end of the support shaft 16, and a disc 45 is fixedly mounted on the outer circumference of one end of the support shaft 16. A bearing 46 is provided between the outer circumference of the disc 45 and the vertical part of the heat-resistant material rack 11. The support shaft 16 is rotatably mounted on the vertical part of the heat-resistant material rack 11 via the bearing 46, and the other end of the support shaft 16 is suspended. A vent hole 53 is provided inside the disc 45, and multiple limiting grooves 51 are provided on the outer circumference of the disc 45. A limiting component is provided inside the vertical part of the heat-resistant material rack 11. The limiting component is located on the outer circumference of the disc 45 and includes a housing 47. The housing 47 is disposed inside the vertical part of the heat-resistant material rack 11, and a limiting member 48 is slidably mounted inside the housing 47. A second thermal expansion member 49 and a second spring 50 are connected between one side of the limiting member 48 and the housing 47. A gas channel is provided inside the vertical part of the heat-resistant material rack 11, and the gas channel communicates with the interior of the support shaft 16 through the vent hole 53 inside the disc 45.

[0034] Preferred options are shown in the appendix. Figure 1 To be continued Figure 4 A pair of second guide rails 14 are symmetrically arranged on the lower inner side of the furnace body 15, and the pair of second guide rails 14 are correspondingly arranged with a pair of first guide rails 13.

[0035] Specific usage of this invention: S1: Hub loading. The operator pushes the trolley body 10 to the loading station, fixes the extended end of the drive telescopic rod 12 to the connecting end of the flat part of the heat-resistant material rack 11, and connects one end of the telescopic connecting pipe 34 to the connecting valve 33. The drive telescopic rod 12 retracts, causing the heat-resistant material rack 11 to move horizontally on a pair of first guide rails 13, so that the heat-resistant material rack 11 moves smoothly to the upper side of the bottom plate of the trolley body 10. The operator places multiple hubs on the outer periphery of the support shaft 16 in sequence, so that the hubs slide along the outer periphery of the support shaft 16 to the outer periphery of the corresponding thermal expansion ring 18. At this time, the outer periphery of the thermal expansion ring 18 and the inner hole of the hub are initially pressed into contact.

[0036] S2: Rotary jet cleaning. The operator cranks the control lever 19 to rotate the support shaft 16. The rotation of the support shaft 16, through a key or interference fit, causes the thermal expansion ring 18 to rotate synchronously. The outer circumference of the thermal expansion ring 18 and the inner hole of the hub generate frictional compression contact, thereby causing multiple hubs to rotate synchronously. The control system controls the retraction of two bidirectional telescopic rods 30. The retraction of the two ends of the bidirectional telescopic rods 30 causes the two push blocks 31 to move closer to each other. Since the lower end of the movable block 26 and the upper end of the push block 31 both slide within the clearance groove 52, the two push blocks 31 move closer to each other and contact the two movable blocks 26 respectively. This causes the two movable blocks 26, the slider 21, and the clamping block 22 to move closer to each other. The two clamping blocks 22 cause the two cleaning parts 27 to move closer to each other until they contact the outer circumference of the hub, while maintaining a gap between the soft pad 23 and the outer circumference of the hub. At this time, the two bidirectional telescopic rods 30 stop, the wheel hub rotates and cooperates with the two cleaning parts 27 to clean the outer circumference of the wheel hub. The pair of cleaning parts 28 arranged at intervals on the cleaning parts 27 perform a double cleaning action on the outer circumference of the wheel hub, which helps to quickly remove the dirt that has been cleaned off. The control system controls the air pump 32 to start. The air pump 32 delivers air through the telescopic connecting pipe 34 and the connecting valve 33 to the horizontal and vertical parts of the heat-resistant material rack 11. The air in the horizontal part of the heat-resistant material rack 11 is delivered to the clamping block 22 through the round pipe 25 and the inside of the slider 21. The air in the clamping block 22 is delivered to multiple grooves 24 through multiple channels 35. The grooves 24 guide the air so that the air can fully blow and clean the outer circumference of the wheel hub. At the same time, the rotation of the wheel hub causes the air to thoroughly blow and clean the outer circumference of the wheel hub, ensuring that the outer circumference of the wheel hub is clean. Meanwhile, the gas inside the vertical part of the heat-resistant material rack 11 enters the interior of the support shaft 16 through the gas channel and the vent 53 inside the disc 45. The gas inside the support shaft 16 is purged and cleaned by multiple sets of purging components tilted towards the interior of the hub to ensure the hub is clean. Then the air pump 32 is turned off, one end of the telescopic connecting pipe 34 is disconnected from the connecting valve 33, and the residual gas in the air channel inside the heat-resistant material rack 11 is naturally discharged through the groove 24 and the nozzle 44.

[0037] S3: Clamping and locking. The control system controls the two bidirectional telescopic rods 30 to retract again. The retraction of the two ends of the bidirectional telescopic rods 30 drives the two push blocks 31 to move closer to each other. The two push blocks 31 drive the two movable blocks 26, the slider 21, and the clamping block 22 to continue to move closer to each other. The two clamping blocks 22 drive the two soft pads 23 to make close contact with the outer periphery of the wheel hub and cooperate with the support shaft 16 to clamp and lock the wheel hub. At this time, the cleaning part 27 still maintains contact with the outer periphery of the wheel hub and, together with the soft pads 23, applies clamping force to the outer periphery of the wheel hub.

[0038] S4: Docking and Pushing into the Furnace Chamber. The operator pushes the trolley body 10, moving it to one side of the furnace body 15, and aligns it with the pair of second guide rails 14 on the furnace body 15 and the pair of first guide rails 13 on the bottom plate of the trolley body 10. The control system extends the drive telescopic rod 12, moving the heat-resistant material rack 11 from the pair of first guide rails 13 to the pair of second guide rails 14, allowing it to enter the furnace body 15. The extended end of the drive telescopic rod 12 disconnects from the connecting end of the heat-resistant material rack 11, and the drive telescopic rod 12 retracts, leaving the heat-resistant material rack 11 and multiple wheel hubs inside the furnace body 15, and the furnace door closes. In this configuration, since one side of the protrusion 38 contacts the inclined surface of one side wall of the slot 36, and the other side of the protrusion 38 contacts the flat surface of the other side wall of the slot 36, the slot 36 and the protrusion 38 cooperate to provide unidirectional limiting for the slider 21. This allows a pair of sliders 21 to move closer to each other normally but not further apart. Thus, after the push block 31 and the movable block 26 disengage, the clamping force of the two clamping blocks 22 and the soft pad 23 on the outer periphery of the hub is not affected, allowing the heat-resistant material rack 11 and multiple hubs to smoothly enter the furnace body 15. The first spring 41 is elastically connected between the frame 39 and the slider 37, ensuring that part of the protrusion 38 is located within the corresponding slot 36.

[0039] S5: Automatic switching to high-temperature hot state. The furnace body 15 begins to heat up, gradually reaching the heat treatment process temperature. The thermal expansion ring 18 expands radially upon heating, increasing its outer diameter and gradually increasing the pressure and clamping force on the inner hole of the hub, providing stable radial support. Simultaneously, the second annular groove 43 on the outer circumference of the thermal expansion ring 18 provides deformation space during thermal expansion, improving clamping stability and preventing the hub from wobbling on the support shaft 16. The second thermal expansion component 49 expands upon heating, pushing the limiting component 48 to move. The limiting component 48 moves into the corresponding limiting groove 51, using the cooperation of the limiting groove 51 and the limiting component 48 to rotate and fix the disc 45 and the support shaft 16. When the limiting component 48 moves, it stretches the second spring 50, generating elastic force. At this time, the support shaft 16 is relatively fixed to the heat-resistant material rack 11, allowing the hub to undergo normal heat treatment within the furnace body 15. The first thermal expansion member 40 expands due to heat, pushing the two push rods 42 away from each other along the guide groove. The two push rods 42 push the two sliding members 37 away from each other, causing the protrusion 38 to disengage from the corresponding slot 36. At this time, under the elastic force of a pair of return springs 29, the two movable blocks 26, the slider 21, and the clamping block 22 are pushed away from each other. The two clamping blocks 22 cause the two soft pads 23 to disengage from the outer periphery of the hub, so that the outer periphery of the hub can fully contact the hot air inside the furnace body 15.

[0040] S6: Unloading and Cooling After heat treatment, the furnace door is opened, the telescopic rod 12 is extended and connected to the connecting end of the heat-resistant material rack 11, and the telescopic rod 12 is retracted to move the heat-resistant material rack 11 out of the furnace body 15. The heat-resistant material rack 11 gradually moves from a pair of second guide rails 14 to a pair of first guide rails 13, so that the heat-resistant material rack 11 moves smoothly to the upper side of the bottom plate of the trolley body 10. The operator pushes the trolley body 10 to the unloading station for cooling, and the heat-resistant material rack 11 and the hub gradually cool to room temperature. The thermal expansion ring 18, the first thermal expansion component 40, and the second thermal expansion component 49 contract as the temperature decreases. The thermal expansion ring 18 undergoes radial contraction and reduces the degree of compression on the inner hole of the hub, so that when the operator applies external force to the machine, the hub can be slid out from the outer periphery of the support shaft 16. The contraction of the first thermal expansion member 40 causes the two push rods 42 to retract along the guide groove and disengage from the two sliding members 37. Under the elastic force of the two first springs 41, the protrusion 38 is partially located in the slot 36. The contraction of the second thermal expansion member 49, under the elastic force of the second spring 50, causes the limiting member 48 to disengage from the limiting groove 51, so that the disc 45 can rotate within the vertical part of the heat-resistant material rack 11.

[0041] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A material handling trolley for an aluminum alloy wheel heat treatment furnace, comprising a trolley body (10) and a heat-resistant material rack (11), wherein the heat-resistant material rack (11) is detachably disposed from the trolley body (10) and is used to carry the wheel hub and move it into and out of the furnace body (15), wherein the heat-resistant material rack (11) has an L-shaped structure, comprising a vertical part and a horizontal part, characterized in that, Also includes: A support shaft (16) is provided in the vertical part of the heat-resistant material rack (11) and is used to pass through the inner hole of the hub; A thermal expansion ring (18) is fitted around the outer periphery of the support shaft (16) and is used to expand radially when heated to clamp the inner hole of the hub. The clamping block (22) is movably disposed on the flat part of the heat-resistant material rack (11) for clamping the outer periphery of the wheel hub at room temperature; A heat-sensitive release mechanism is provided on the heat-resistant material rack (11) and cooperates with the clamping block (22) to drive the clamping block (22) to release the clamping of the outer periphery of the wheel hub when heated.

2. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 1, characterized in that, The heat-resistant material rack (11) has a sliding groove (20) on its flat side, and a slider (21) is slidably disposed in the sliding groove (20). The clamping block (22) is fixed to the upper side of the slider (21), and a movable block (26) is fixed to the lower side of the slider (21). The heat-resistant material rack (11) has a clearance groove (52) on its lower side, and the lower end of the movable block (26) extends into the clearance groove (52). The heat-sensitive release mechanism includes a first thermal expansion member (40), a frame (39), a push rod (42), a slider (37), and a return spring (29). The first thermal expansion member (40) is disposed in the frame (39), and the push rod (42) is disposed on both sides of the first thermal expansion member (40). 2) The slider (37) is slidably disposed on both sides of the slide groove (20). The push rod (42) cooperates with the slider (37). The slider (37) is provided with a protrusion (38). The slider (21) is provided with slots (36) on both sides. The protrusion (38) and the slot (36) are in a one-way limiting cooperation. The return spring (29) is connected between the movable block (26) and one end of the slide groove (20). When the first thermal expansion member (40) is heated and expanded, it pushes the slider (37) to move through the push rod (42), so that the protrusion (38) disengages from the slot (36). The return spring (29) drives the slider (21) and the clamping block (22) away from the hub.

3. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 2, characterized in that, One side of the protrusion (38) contacts the inclined side wall of the slot (36), and the other side of the protrusion (38) contacts the plane of the other side wall of the slot (36). A first spring (41) is respectively connected between the two ends of the frame (39) and the two sliders (37). The first spring (41) is used to make the protrusion (38) partially located in the slot (36).

4. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 1, characterized in that, The support shaft (16) is rotatably mounted on the vertical part of the heat-resistant material rack (11). The outer circumference of the support shaft (16) is provided with a plurality of first annular grooves (17). The thermal expansion ring (18) is sleeved in the first annular groove (17). A circumferential fixing structure is provided between the thermal expansion ring (18) and the support shaft (16). The outer circumference of the thermal expansion ring (18) is provided with a plurality of second annular grooves (43). The second annular grooves (43) are used to provide deformation space when the thermal expansion ring (18) is heated and expanded.

5. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 4, characterized in that, One end of the support shaft (16) is fixedly provided with an operating rod (19), and a disc (45) is fixedly fitted around the outer periphery of one end of the support shaft (16). A bearing (46) is provided between the outer periphery of the disc (45) and the vertical part of the heat-resistant material rack (11). The support shaft (16) is rotatably mounted on the vertical part of the heat-resistant material rack (11) through the bearing (46), and the other end of the support shaft (16) is suspended in the air. The disc (45) has a vent hole (53) inside, and multiple limiting grooves (51) are opened on the outer periphery of the disc (45). The heat-resistant material rack (11) is provided with a limiting component in its vertical part. The limiting component includes a housing (47), a limiting member (48), a second thermal expansion member (49), and a second spring (50). The limiting member (48) is slidably disposed in the housing (47). The second thermal expansion member (49) and the second spring (50) are connected between one side of the limiting member (48) and the housing (47). The second thermal expansion member (49) expands under heat and pushes the limiting member (48) into the limiting groove (51) to lock the rotation of the support shaft (16).

6. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 2, characterized in that, The upper arc surface of the clamping block (22) is provided with a soft pad (23), and the inner arc surface of the soft pad (23) is provided with a plurality of grooves (24) at intervals. The clamping block (22) is provided with a plurality of channels (35), and the plurality of channels (35) are provided in a one-to-one correspondence with the plurality of grooves (24). One end of each channel (35) is connected to a corresponding groove (24). One end of the slider (21) is provided with a round tube (25), and one end of the round tube (25) extends into the flat part of the heat-resistant material rack (11). The interior of the round tube (25) is connected to the plurality of channels (35) in sequence through the interior of the slider (21) and the interior of the clamping block (22). The round tube (25) is connected to the flat part of the heat-resistant material rack (11) so that gas is sprayed out from the groove (24) to clean the outer circumference of the wheel hub.

7. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 6, characterized in that, The soft pad (23) has a cleaning element (27) at its arc-shaped upper end. The cleaning element (27) has a pair of cleaning parts (28) spaced apart on its outer periphery. The cleaning element (27) is used to contact the outer periphery of the wheel hub for mechanical cleaning, and when clamped, it works together with the soft pad (23) to apply clamping force to the outer periphery of the wheel hub.

8. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 2, characterized in that, The bottom plate of the trolley body (10) is provided with a bidirectional telescopic rod (30) and an air pump (32). Each end of the bidirectional telescopic rod (30) is provided with a push block (31). The upper end of the push block (31) extends into the clearance groove (52) and cooperates with the movable block (26) to drive the clamping block (22) to move. The flat side of the heat-resistant material rack (11) is provided with a connecting valve (33). A telescopic connecting pipe (34) is connected between the air pump (32) and the connecting valve (33).

9. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 1, characterized in that, The bottom plate of the trolley body (10) is provided with a pair of first guide rails (13), and the flat part of the heat-resistant material rack (11) slides on the first guide rails (13); the lower inside of the furnace body (15) is provided with a pair of second guide rails (14), which are correspondingly arranged with the first guide rails (13) for the heat-resistant material rack (11) to slide from the trolley body (10) into the furnace body (15); the bottom plate of the trolley body (10) is also provided with a drive telescopic rod (12), and the extended end of the drive telescopic rod (12) is detachably connected to the connecting end of the flat part of the heat-resistant material rack (11) for pushing the heat-resistant material rack (11) to move.

10. The aluminum alloy wheel heat treatment furnace loading and unloading trolley as described in claim 5, characterized in that, The support shaft (16) has an air passage inside, and multiple sets of purging components are provided on the outer periphery of the support shaft (16). The nozzles (44) in the purging components are connected to the air passage and are used to purge the inside of the hub. The vertical part of the heat-resistant material rack (11) is connected to the inside of the support shaft (16) through the inside of the disc (45) to supply air to the air passage.

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