Hydraulic retractable tire mounting machine and mounting method thereof

Abstract

This invention discloses a hydraulic retractable tire mounting machine and its installation method. The mounting machine includes a base, a hydraulic power unit, a hydraulic cylinder, a steel rim fixing structure, a central retractable rod, and a three-lobed circular variable diameter locking device. The hydraulic cylinder is mounted on the base, and the central retractable rod is connected to the telescopic end of the hydraulic cylinder. The steel rim fixing structure supports and positions the steel rim to be installed. The three-lobed circular variable diameter locking device is located at the upper end of the central retractable rod. The three-lobed circular variable diameter locking device includes a bottom cover track circle, three variable diameter plates, a rotation control component, and a top cover. The bottom cover track circle has a track groove. The three variable diameter plates have a variable diameter plate body, a guide cylinder, a mating hole, and a track mating part. The rotation control component has a control groove, the guide cylinder mates with the control groove, and the track mating part mates with the track groove. During installation, the lower steel rim, tire, and upper steel rim are placed sequentially and aligned with the fixing screw holes. The three-lobed reducing plate extends and locks the upper steel rim by rotating the control component. Then, a hydraulic cylinder, via a central pull rod, retracts the three-lobed circular reducing locking device, bringing the upper steel rim, tire, and lower steel rim together. Finally, the screws are tightened, and the tire is pushed out for removal. This structure and method abandons the traditional gantry-type downward pressing installation method, which is beneficial for improving the accuracy of steel rim alignment and installation efficiency.

Description

Technical Field

[0001] This invention relates to the field of tire installation equipment technology, specifically to a hydraulic pull-out tire installation machine and its installation method, which is particularly suitable for tire installation scenarios such as trailer tires and pallet tires that need to be fixed by clamping upper and lower steel rims. Background Technology

[0002] When installing trailer tires, pallet tires, and other similar products, the lower steel rim, tire, and upper steel rim are typically placed in sequence, with the fixing screw holes of the upper and lower steel rims aligned. Then, external force is used to bring the upper and lower steel rims together, and finally, screws are used to secure them. Traditional installation methods often use a gantry-type hydraulic pressing structure to press the upper steel rim together. This method involves a large overall equipment size, requires ample operating space, and during the pressing process, the upper and lower steel rims are prone to misalignment, making it difficult to align the fixing screw holes. Operators need to repeatedly adjust the position of the steel rims, resulting in low installation efficiency.

[0003] Meanwhile, in traditional press-fit installation, operators often need to support the rim and tire, align the holes, and pre-tighten the screws. When the pressing direction is not completely aligned with the rim's center of force, problems such as uneven force on the rim, hole misalignment, or difficulty in manual pressing can easily occur, increasing labor intensity and posing certain safety hazards. Therefore, it is necessary to provide a tire installation device and method that is relatively lightweight, can complete the rim merging through a center pull-up method, and facilitates the alignment and fixing of the upper and lower rims and tire removal. Summary of the Invention

[0004] The purpose of this invention is to provide a hydraulic pull-up tire mounting machine and its installation method, so as to solve the problems of existing gantry hydraulic pressing tire mounting equipment having a bulky structure, difficulty in keeping the hole positions aligned when the upper and lower steel rims are joined, high manual operation intensity, and inconvenience in tire removal.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A hydraulic retractable tire mounting machine includes a base, a hydraulic power unit, a hydraulic cylinder, a rim fixing structure, a central retracting rod, and a three-lobed circular variable diameter locking device. The hydraulic power unit is connected to the hydraulic cylinder and is used to drive the hydraulic cylinder to extend and retract. The hydraulic cylinder is mounted on the base, and the central retracting rod is connected to the extension end of the hydraulic cylinder. The rim fixing structure is located above the hydraulic cylinder and is used to support and position the rim to be installed. The three-lobed circular variable diameter locking device is located at the upper end of the central retracting rod and can switch between a retracted state and an extended locking state. When the three-lobed circular variable diameter locking device is in the extended locking state, it is used to limit and lock the upper rim located above the tire. The hydraulic cylinder drives the three-lobed circular variable diameter locking device to retract towards the rim fixing structure through the central retracting rod, so that the upper rim, tire, and lower rim are combined and positioned.

[0006] Preferably, the hydraulic power unit includes a motor, an oil tank, and a hydraulic control valve. The motor is connected to the oil tank, and the hydraulic control valve is mounted on the oil tank and connected to the hydraulic cylinder via a hydraulic pipeline.

[0007] Preferably, the steel ring fixing structure includes a fixing disc, a central hole, a fixing post, a supporting post, and a mounting hole. The central hole is located in the middle of the fixing disc, the fixing post is disposed on the fixing disc, the supporting post is disposed below the fixing disc, and the mounting hole is disposed on the fixing disc or on the mounting part connected to the fixing disc.

[0008] Preferably, there are multiple fixing posts, which are arranged at intervals along the circumference of the fixing disk to mate with the holes of the steel ring to be installed, so as to limit the circumferential displacement of the steel ring to be installed relative to the fixing disk.

[0009] Preferably, the three-lobed circular variable diameter locking device includes a bottom cover track circle, a three-lobed variable diameter plate, a rotation control component, and a top cover. The three-lobed variable diameter plate is disposed between the bottom cover track circle and the top cover. The rotation control component is in transmission cooperation with the three-lobed variable diameter plate to drive the three-lobed variable diameter plate to extend or retract relative to the bottom cover track circle.

[0010] Preferably, the bottom cover track circle is provided with track grooves and small round holes. The track grooves are arranged circumferentially along the bottom cover track circle and extend from the central area to the outer area. The three-lobed variable diameter plate can be guided to move along the track grooves.

[0011] Preferably, the three-lobed variable diameter plate includes a variable diameter plate body, a guide cylinder, a mating hole, and a track mating part. The track mating part mates with the track groove, and the guide cylinder mates with the rotation control component to drive the variable diameter plate body to move when the rotation control component rotates.

[0012] Preferably, the rotation control component includes a control center hole and a control groove, the guide cylinder extends into or is correspondingly disposed in the control groove, and the control groove is an arc-shaped or variable-diameter groove, so that when the rotation control component rotates, it can drive the three-lobed variable-diameter plate to extend outward or retract inward.

[0013] Preferably, the top cover is disposed above the three-lobed variable diameter piece, and the top cover has a top cover center hole, a top cover countersunk hole and a top cover connecting hole, which are used to restrict the three-lobed variable diameter piece from coming out.

[0014] Preferably, the hydraulic pull-out tire mounting machine further includes a tire ejection device, which has an ejection inner hole and a screw hole. The tire ejection device is correspondingly arranged with the central pull rod or the three-lobed circular variable diameter locking device, and is used to eject the installed tire assembly above the steel rim fixing structure as the central pull rod rises after installation.

[0015] The present invention also provides a hydraulic retractable tire installation method, which uses the above-mentioned hydraulic retractable tire installation machine and includes the following steps: S1. Place the lower steel ring on the steel ring fixing structure so that the lower steel ring is supported and positioned by the steel ring fixing structure; S2. Place the tire on the lower steel rim, then place the upper steel rim on the tire, and align the fixing screw holes of the upper and lower steel rims. S3. Control the hydraulic cylinder to drive the center pull rod to rise, so that the three-lobed circular variable diameter locking device moves to the center area of ​​the upper steel ring; S4. The rotating control component of the rotating three-lobed circular variable diameter locking device causes the three-lobed variable diameter plates to extend outward from the retracted state and form a limit lock on the upper steel ring located above the tire. S5. Control the hydraulic cylinder to perform the retraction action, so that the hydraulic cylinder drives the three-lobed circular variable diameter locking device to move towards the steel rim fixing structure through the central retraction rod, thereby merging the upper steel rim, tire and lower steel rim together; S6. After the upper and lower steel rings are joined in place, fix the upper and lower steel rings together with screws. S7. Control the hydraulic cylinder to drive the center retractor rod to rise, and push the installed tire assembly out of the steel rim fixing structure through the tire push-out device. Then, retract the three-lobed variable diameter plate and remove the tire assembly.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: I. This invention adopts a hydraulic pull-out installation method instead of the traditional gantry hydraulic pressing installation method. The upper steel ring is centrally locked and pulled out by the central pull rod and the three-lobed circular variable diameter locking device, so that the upper steel ring, tire and lower steel ring are merged along the central direction. The overall structure of the equipment is relatively lightweight and the operation process is more concentrated.

[0017] Second, the present invention supports and positions the lower steel ring through a steel ring fixing structure and restricts the circumferential displacement of the steel ring through a fixing post. This can maintain the relative position of the fixing screw holes before the upper and lower steel rings are merged, which helps to improve the accuracy of the steel ring in the hole alignment.

[0018] Third, the three-lobed circular variable diameter locking device of the present invention can switch between a retracted state and an extended locking state. The retracted state facilitates passage through the central area of ​​the steel ring, while the extended locking state facilitates the formation of a limiting lock on the upper steel ring. The operation is intuitive and easy to control manually.

[0019] Fourth, the three-lobed variable diameter plate of the present invention achieves synchronous extension or retraction through the cooperation between the guide cylinder, the control groove, the track mating part and the track groove, so that the diameter change process of the three-lobed circular variable diameter locking device has good guidance and stability.

[0020] Fifth, the present invention is equipped with a tire ejection device, which can eject the tire assembly above the steel rim fixing structure by the upward movement of the central pull rod after the tire is installed, making it easier for the operator to remove the installed tire and reducing the difficulty of tire removal.

[0021] VI. This invention defines the sequential steps of lower steel rim positioning, tire placement, upper steel rim alignment, three-lobed locking, hydraulic retraction, screw fixing, and tire removal through an installation method. This allows the equipment structure and installation process to work together, reducing the labor intensity of manual pressing and repeated hole alignment, and improving tire installation efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the hydraulic retractable tire mounting machine of the present invention; Figure 2 This is a top view of the steel ring fixing structure of the present invention; Figure 3 This is a schematic diagram of the side structure of the steel ring fixing structure of the present invention; Figure 4 This is a schematic diagram of the circular structure of the bottom cover track of the present invention; Figure 5 This is a schematic diagram of the rotation control component of the present invention; Figure 6 This is a schematic diagram of the three-lobed variable diameter plate structure of the present invention; Figure 7 This is a schematic diagram of the top cover structure of the present invention; Figure 8This is a schematic diagram of the tire ejection device of the present invention; Figure 9 This is a flowchart of the hydraulic retractable tire installation method of the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Base; 2. Hydraulic power unit; 21. Motor; 22. Oil tank; 23. Hydraulic control valve; 3. Hydraulic cylinder; 4. Steel ring fixing structure; 41. Fixing disc; 42. Center hole; 43. Fixing column; 44. Supporting column; 45. Mounting hole; 5. Center pull rod; 6. Three-lobed circular variable diameter locking device; 61. Bottom cover track circle; 612. Track groove; 613. Small round hole; 62. Three-lobed variable diameter plate; 621. Variable diameter plate body; 622. Guide column; 623. Mating hole; 624. Track mating part; 63. Rotation control component; 631. Control center hole; 632. Control groove; 64. Top cover; 641. Top cover center hole; 642. Top cover countersunk hole; 643. Top cover connecting hole; 65. Tire ejection device; 651. Ejection inner hole; 652. Screw hole. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. It should be understood that the described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent substitutions or conventional modifications made under the technical concept of the present invention should fall within the scope of protection of the present invention.

[0025] like Figure 1 As shown, this embodiment provides a hydraulic retractable tire mounting machine, including a base 1, a hydraulic power unit 2, a hydraulic cylinder 3, a steel rim fixing structure 4, a central retractable rod 5, and a three-lobed circular variable diameter locking device 6. The base 1 supports the hydraulic power unit 2 and the hydraulic cylinder 3, forming the basic support for the equipment. The hydraulic cylinder 3 is vertically mounted on the base 1. The central retractable rod 5 is connected to the telescopic end of the hydraulic cylinder 3 and is arranged along the center direction of the steel rim fixing structure 4. The three-lobed circular variable diameter locking device 6 is located at the upper end of the central retractable rod 5 and can move up, down, and retract with the central retractable rod 5.

[0026] The hydraulic power unit 2 includes a motor 21, an oil tank 22, and a hydraulic control valve 23. The motor 21 provides power to the hydraulic system, the oil tank 22 stores hydraulic oil, and the hydraulic control valve 23 is connected to the hydraulic cylinder 3 via hydraulic lines to control the rising, falling, and retracting movements of the hydraulic cylinder 3. In actual use, the operator can control the position of the central retracting rod 5 through the hydraulic control valve 23, moving the three-lobed circular reducing locking device 6 to the corresponding height of the steel ring to be installed.

[0027] like Figure 2 and Figure 3As shown, the steel ring fixing structure 4 includes a fixing disc 41, a central hole 42, fixing posts 43, a supporting column 44, and a mounting hole 45. The fixing disc 41 supports the lower steel ring to be installed. The central hole 42 is located in the center of the fixing disc 41, allowing the central pull rod 5, the three-lobed circular reducing locking device 6, or related lifting components to pass through. Multiple fixing posts 43 are disposed on the fixing disc 41 and are spaced apart circumferentially along the fixing disc 41. When the lower steel ring to be installed is placed on the fixing disc 41, the fixing posts 43 can mate with holes or positioning areas on the lower steel ring to limit circumferential displacement of the lower steel ring during installation. The supporting column 44 is located below the fixing disc 41 to support the fixing disc 41 and maintain it at a predetermined installation height. The mounting hole 45 is used for the fixed connection between the steel ring fixing structure 4 and the hydraulic cylinder 3 or related mounting base.

[0028] like Figures 4 to 7 As shown, the three-lobed circular variable diameter locking device 6 includes a bottom cover track circle 61, a three-lobed variable diameter plate 62, a rotation control component 63, and a top cover 64. The three-lobed variable diameter plate 62 is disposed between the bottom cover track circle 61 and the top cover 64. The bottom cover track circle 61 is used to support and guide the three-lobed variable diameter plate 62, the rotation control component 63 is used to drive the three-lobed variable diameter plate 62 to extend or retract, and the top cover 64 is used to restrict the three-lobed variable diameter plate 62 from disengaging, so that the three-lobed variable diameter plate 62 can move stably between the bottom cover track circle 61 and the top cover 64.

[0029] like Figure 4 As shown, the bottom cover track circle 61 is provided with track grooves 612 and small round holes 613. There are multiple track grooves 612, spaced apart circumferentially along the bottom cover track circle 61. The track grooves 612 extend from the central region of the bottom cover track circle 61 outwards, and are used to mate with the track mating part 624 of the three-lobed variable diameter plate 62, thereby guiding the extension or retraction movement of the three-lobed variable diameter plate 62. The small round holes 613 can be used for mounting connections or connection with other mating parts.

[0030] like Figure 6 As shown, the three-lobed variable diameter plate 62 includes a variable diameter plate body 621, a guide cylinder 622, a mating hole 623, and a track mating part 624. The variable diameter plate body 621 has a circumferentially distributed lobe structure, and multiple variable diameter plate bodies 621 together form a three-lobed variable diameter structure. The guide cylinder 622 is disposed on the variable diameter plate body 621 and is used to mate with the control groove 632 of the rotation control component 63. The mating hole 623 is disposed on the variable diameter plate body 621 and is used for connection or mating installation. The track mating part 624 is disposed on the variable diameter plate body 621 and mates with the track groove 612 of the bottom cover track circle 61, so that the variable diameter plate body 621 is guided by the track groove 612 during movement.

[0031] like Figure 5As shown, the rotation control component 63 includes a control center hole 631 and a control groove 632. The control center hole 631 is for the center retracting rod 5 or the connecting piece to pass through. The control groove 632 is an arc-shaped or variable-diameter groove, and the guide cylinder 622 extends into or is correspondingly disposed within the control groove 632. When the operator rotates the rotation control component 63, the control groove 632 drives the guide cylinder 622, causing the guide cylinder 622 to move the variable-diameter plate body 621 along the track groove 612, thereby causing the three-lobed variable-diameter plate 62 to extend outward or retract inward.

[0032] like Figure 7 As shown, the top cover 64 is disposed above the three-lobed variable diameter plate 62. The top cover 64 includes a top cover center hole 641, a top cover countersunk hole 642, and a top cover connecting hole 643. The top cover center hole 641 is used for the center pull rod 5 or a connector to pass through, the top cover countersunk hole 642 is used to form an installation clearance or accommodating space, and the top cover connecting hole 643 is used to connect with the bottom cover track circle 61 or other connectors. The top cover 64 can restrict the three-lobed variable diameter plate 62 from axially disengaging, allowing the three-lobed variable diameter plate 62 to move along a predetermined path between the bottom cover track circle 61 and the top cover 64.

[0033] like Figure 8 As shown, the hydraulic pull-out tire mounting machine also includes a tire ejection device 65. The tire ejection device 65 has an ejection inner hole 651 and a screw hole 652. The ejection inner hole 651 is for the central pull rod 5 or related central components to pass through, and the screw hole 652 is for mounting and fixing the tire ejection device 65. The tire ejection device 65 is correspondingly arranged with the central pull rod 5 or the three-lobed circular reducing locking device 6. After the tire is installed, when the central pull rod 5 rises, it can drive the tire ejection device 65 to push the installed tire assembly out above the steel rim fixing structure 4, making it easy for the operator to remove the tire assembly.

[0034] like Figure 9 As shown, the installation method of the present invention includes the following steps: First, place the lower steel rim on the fixing disc 41 of the steel rim fixing structure 4, so that the lower steel rim is supported by the fixing disc 41, and the circumferential displacement of the lower steel rim is restricted by the fixing post 43. Then, place the tire on the lower steel rim, and then place the upper steel rim on the tire, and align the fixing screw holes of the upper steel rim and the lower steel rim with each other.

[0035] Subsequently, the operator controls the hydraulic cylinder 3 via the hydraulic control valve 23, causing the central retractor 5 to lift the three-lobed circular variable diameter locking device 6 to the center area of ​​the upper steel rim. Once the three-lobed circular variable diameter locking device 6 is in position, the operator rotates the rotary control component 63, causing the three-lobed variable diameter plates 62 to extend outwards from their retracted state. The three-lobed variable diameter plates 62 move outwards synchronously under the combined action of the guide cylinder 622, control groove 632, track mating part 624, and track groove 612, forming an extended locking state. At this time, the three-lobed circular variable diameter locking device 6 can limit and lock the upper steel rim located above the tire.

[0036] Then, the operator controls the hydraulic cylinder 3 to perform a retraction / pulling action. The hydraulic cylinder 3, through the central retraction rod 5, drives the three-lobed circular reducing locking device 6 towards the steel rim fixing structure 4, causing the upper steel rim, tire, and lower steel rim to gradually merge along the center direction. Because the lower steel rim is positioned by the steel rim fixing structure 4, and the upper steel rim is locked by the three-lobed circular reducing locking device 6, the relative positions of the upper and lower steel rims are more easily maintained during the retraction / merging process, which is beneficial for aligning the fixing screw holes. After merging into place, the operator fixes the upper and lower steel rims together with screws.

[0037] Finally, the operator controls the hydraulic cylinder 3 to rise, causing the central retractor 5 to rise, and pushes the installed tire assembly out of the rim fixing structure 4 via the tire ejection device 65. Then, the operator rotates the rotary control component 63 to retract the three-lobed reducing plate 62 from its extended locking state, releasing the locking relationship between the three-lobed circular reducing lock 6 and the upper rim, and removing the installed tire assembly. The above steps can be repeated to install the next tire.

[0038] In this embodiment, the bottom cover track circle 61, the three-lobed variable diameter plate 62, the rotation control component 63, and the top cover 64 cooperate to form the main structure of the three-lobed circular variable diameter locking device 6. The three-lobed variable diameter plate 62 extends or retracts under the control of the rotation control component 63, allowing the three-lobed circular variable diameter locking device 6 to switch between a smaller outer diameter state and a larger outer diameter state. The smaller outer diameter state facilitates the passage of the three-lobed circular variable diameter locking device 6 through the central area of ​​the steel ring; the larger outer diameter state facilitates its locking and limiting of the upper steel ring. This structure can cooperate with the pulling and retracting action of the hydraulic cylinder 3 to achieve a central pulling and merging during the steel ring installation process.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, equivalent substitutions or conventional modifications can be made to the shape, quantity, installation position, and connection method of each component without departing from the concept of the present invention; all such modifications should fall within the protection scope of the present invention.

Claims

1. A hydraulic retractable tire mounting machine, characterized in that, The system includes a base (1), a hydraulic power unit (2), a hydraulic cylinder (3), a steel ring fixing structure (4), a central pull rod (5), and a three-lobed circular variable diameter locking device (6). The hydraulic power unit (2) is connected to the hydraulic cylinder (3) and is used to drive the hydraulic cylinder (3) to extend and retract. The hydraulic cylinder (3) is mounted on the base (1), and the central pull rod (5) is connected to the extension and retraction end of the hydraulic cylinder (3). The steel ring fixing structure (4) is located above the hydraulic cylinder (3) and is used to support and position the steel ring to be installed. The three-lobed circular variable diameter locking device (6) is mounted on the base (1). The three-lobed circular variable diameter locking device (6) is located at the upper end of the central retracting rod (5). The three-lobed circular variable diameter locking device (6) can switch between the retracted state and the extended locking state. When the three-lobed circular variable diameter locking device (6) is in the extended locking state, the three-lobed circular variable diameter locking device (6) is used to limit and lock the upper steel rim located above the tire. The hydraulic cylinder (3) drives the three-lobed circular variable diameter locking device (6) to retract towards the steel rim fixing structure (4) through the central retracting rod (5) so that the upper steel rim, tire and lower steel rim are combined and positioned.

2. The hydraulic retractable tire mounting machine according to claim 1, characterized in that, The hydraulic power unit (2) includes a motor (21), an oil tank (22) and a hydraulic control valve (23). The motor (21) is connected to the oil tank (22), and the hydraulic control valve (23) is located on the oil tank (22) and connected to the hydraulic cylinder (3) through a hydraulic pipeline.

3. The hydraulic retractable tire mounting machine according to claim 1, characterized in that, The steel ring fixing structure (4) includes a fixing disc (41), a center hole (42), a fixing post (43), a supporting post (44), and a mounting hole (45). The center hole (42) is located in the middle of the fixing disc (41). The fixing post (43) is located on the fixing disc (41). The supporting post (44) is located below the fixing disc (41). The mounting hole (45) is located on the fixing disc (41) or on the mounting part connected to the fixing disc (41).

4. A hydraulic retractable tire mounting machine according to claim 3, characterized in that, There are multiple fixing posts (43), which are arranged at intervals along the circumference of the fixing disk (41) to cooperate with the holes of the steel ring to be installed, so as to limit the circumferential displacement of the steel ring to be installed relative to the fixing disk (41).

5. A hydraulic retractable tire mounting machine according to claim 1, characterized in that, The three-lobed circular variable diameter locking device (6) includes a bottom cover track circle (61), a three-lobed variable diameter plate (62), a rotation control component (63), and a top cover (64). The three-lobed variable diameter plate (62) is disposed between the bottom cover track circle (61) and the top cover (64). The rotation control component (63) is in transmission cooperation with the three-lobed variable diameter plate (62) to drive the three-lobed variable diameter plate (62) to extend or retract relative to the bottom cover track circle (61).

6. A hydraulic retractable tire mounting machine according to claim 5, characterized in that, The bottom cover track circle (61) is provided with a track groove (612) and a small round hole (613). The track groove (612) is arranged circumferentially along the bottom cover track circle (61) and extends from the central area to the outer area. The three-lobed variable diameter plate (62) can be guided to move along the track groove (612).

7. A hydraulic retractable tire mounting machine according to claim 6, characterized in that, The three-lobed variable diameter plate (62) includes a variable diameter plate body (621), a guide cylinder (622), a mating hole (623), and a track mating part (624). The track mating part (624) mates with the track groove (612), and the guide cylinder (622) mates with the rotation control member (63) to drive the variable diameter plate body (621) to move when the rotation control member (63) rotates.

8. A hydraulic retractable tire mounting machine according to claim 7, characterized in that, The rotation control component (63) includes a control center hole (631) and a control groove (632). The guide cylinder (622) extends into or is correspondingly disposed in the control groove (632). The control groove (632) is an arc-shaped or variable-diameter groove, so that when the rotation control component (63) rotates, it can drive the three-lobed variable-diameter plate (62) to extend outward or retract inward. The top cover (64) is disposed above the three-lobed variable-diameter plate (62). The top cover (64) is provided with a top cover center hole (641), a top cover countersunk hole (642), and a top cover. The cover connection hole (643) is used to restrict the three-lobed variable diameter plate (62) from coming out; the hydraulic pull-out tire installation machine also includes a tire ejection device (65), which is provided with an ejection inner hole (651) and a screw hole (652). The tire ejection device (65) is correspondingly set with the central pull rod (5) or the three-lobed circular variable diameter locking device (6), and is used to push the installed tire assembly out above the steel rim fixing structure (4) as the central pull rod (5) rises after installation.

9. A hydraulically retractable tire installation method, characterized in that, The installation is performed using the hydraulic pull-out tire mounting machine as described in claim 8, comprising the following steps: S1, placing the lower steel ring on the steel ring fixing structure (4), so that the lower steel ring is supported and positioned by the steel ring fixing structure (4); S2, placing the tire on the lower steel ring, and then placing the upper steel ring on the tire, and aligning the fixing screw holes of the upper steel ring and the lower steel ring with each other; S3, controlling the hydraulic cylinder (3) to drive the central pull rod (5) to rise, so that the three-lobed circular variable diameter locking device (6) moves to the center area of ​​the upper steel ring; S4, rotating the rotation control component (63) of the three-lobed circular variable diameter locking device (6), so that the three-lobed variable diameter plate (62) is retracted. The state extends outward and forms a limit lock on the upper steel rim located above the tire; S5, control the hydraulic cylinder (3) to perform a retraction action, so that the hydraulic cylinder (3) drives the three-lobed circular variable diameter locking device (6) to move towards the steel rim fixing structure (4) through the central retraction rod (5), so that the upper steel rim, tire and lower steel rim are combined; S6, after the upper steel rim and lower steel rim are combined into place, the upper steel rim and lower steel rim are fixedly connected by screws; S7, control the hydraulic cylinder (3) to drive the central retraction rod (5) to rise, push the installed tire assembly out of the steel rim fixing structure (4), and then retract the three-lobed variable diameter piece (62) and remove the tire assembly.

10. A hydraulic retractable tire installation method according to claim 9, characterized in that, In step S1, the lower steel ring is placed on the fixed disk (41), and the circumferential offset of the lower steel ring relative to the fixed disk (41) is restricted by the fixed column (43); in step S4, when the rotation control component (63) rotates, the control groove (632) drives the guide column (622) to move, and the guide column (622) drives the variable diameter plate body (621) to extend outward along the track groove (612), so that the three-lobed circular variable diameter locking device (6) switches from the retracted state to the extended locking state; in step S7, after the three-lobed variable diameter plate (62) is retracted, the three-lobed circular variable diameter locking device (6) releases the limiting lock on the upper steel ring.

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