A movable gantry for small motor maintenance

Abstract

This invention discloses a movable gantry for the maintenance of small motors, belonging to the technical field of small motor maintenance equipment. The gantry includes a lifting beam, columns, a base, casters, and a suspension device; the base contains a support assembly and two sets of temporary storage assemblies. The support assembly includes an adjusting handwheel, a transmission mechanism, support foot assemblies, and foot cups; the temporary storage assembly includes a storage tray, which is connected to the support foot assemblies via a linkage mechanism. When the adjusting handwheel is rotated, the transmission mechanism drives the support foot assemblies to extend, causing the foot cups to lower and support the ground. Simultaneously, the linkage mechanism causes the storage tray to automatically unfold from the side of the base, providing temporary storage space for maintenance tools and small parts. This invention achieves stable support and temporary storage simultaneously in a single operation, utilizing the self-locking characteristics of a worm gear to ensure stable support, solving the problems of easy swaying and displacement and lack of temporary storage space in existing gantry frames, thus improving the convenience and safety of maintenance.

Description

Technical Field

[0001] This invention relates to the field of small motor repair equipment technology, specifically a movable gantry for small motor repair. Background Technology

[0002] In the inspection, maintenance, and installation of small motors, it is often necessary to lift, rotate, or disassemble the motors. Gantry cranes, as a common type of lifting equipment, are widely used due to their simple structure and strong load-bearing capacity. Traditional small gantry cranes typically consist of a lifting beam, two side columns, and a base. Casters are installed under the base to enable overall movement, and some gantry cranes also have brake devices added to the casters for temporary positioning. However, in actual maintenance operations, motors are often placed on the workshop floor or work platform. After the gantry crane is moved into position, it relies solely on the braked casters for support. Due to the small contact area between the casters and the ground and the limited braking force, swaying or displacement is likely to occur when lifting heavy objects or subjected to lateral forces, posing a safety hazard. In addition, maintenance sites usually require the use of various tools (such as wrenches, screwdrivers, multimeters, etc.) and the disassembly of a large number of bolts, nuts, and other small parts. These items lack suitable temporary storage locations, and random stacking not only makes them easy to lose but also creates clutter on the work surface, affecting maintenance efficiency.

[0003] To address the aforementioned issues, while some existing gantry cranes incorporate retractable outriggers or support feet on their bases to improve parking stability, these support structures typically offer only a single support function, requiring independent operation for deployment and retraction, making them cumbersome to use. Furthermore, the issue of temporary storage for maintenance tools and small parts remains unresolved, often necessitating workers to transport tool carts or temporarily set up workbenches nearby, increasing preparation time and labor intensity. Therefore, it is necessary to design a gantry crane structure that provides both stable support and onboard temporary storage space to simplify operation and enhance maintenance convenience and safety. Summary of the Invention

[0004] (a) Technical problems to be solved In response to the shortcomings of existing technologies, this invention can simultaneously achieve stable support and temporary storage functions in a single operation. It solves the problems of existing gantry cranes being prone to shaking and displacement when parked using only casters, and lacking temporary storage space for maintenance tools and small parts, resulting in low maintenance efficiency and safety hazards.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a movable gantry for the maintenance of small motors, including a lifting beam and columns installed at both ends of the lifting beam. The bottom of each column is fixedly installed with a base, and the bottom of the base is provided with a universal wheel with brake. The lifting beam is provided with a suspension device. The base is internally equipped with a support assembly and two sets of temporary storage assemblies; The support assembly includes an adjustment handwheel, a transmission mechanism connected to the adjustment handwheel, and a support foot assembly connected to the transmission mechanism, wherein the support foot assembly has foot cups; The temporary storage component includes a storage tray, which is connected to the support leg component via a linkage mechanism.

[0006] The transmission mechanism includes a worm gear and a first transmission component. The first transmission component includes a rotating shaft, a worm wheel, and a first gear. The upper and lower ends of the rotating shaft are rotatably connected to the inner wall of the base. The worm wheel and the first gear are coaxially fixed on the rotating shaft. The worm wheel cooperates with the worm gear. One end of the adjusting handwheel is fixedly connected to the worm gear, and the other end of the worm gear is rotatably connected to the base. The transmission mechanism also includes two first racks, which are located on different sides of the first gear and are arranged parallel to each other. The first gear cooperates with the two first racks. The distal ends of the two first racks are respectively connected to push plates, which are slidably disposed within the base.

[0007] The push plate has a groove, and the base has a strip-shaped protrusion inside. The groove and the strip-shaped protrusion cooperate, and the push plate slides along the strip-shaped protrusion. Each push plate has a cross push rod fixedly connected to its opposite end. The support foot assembly includes two telescopic rods, which are movably connected to the two cross push rods respectively. Each telescopic rod corresponds to a set of temporary storage components.

[0008] The cross push rod has a sliding fit between its upper and lower ends and the telescopic rod. The telescopic rod has a spring inside, with one end of the spring fixed to the inner wall of the telescopic rod and the other end fixed to the end of the cross push rod. The cross push rod has a second toothed rack on both sides.

[0009] The linkage mechanism includes multiple transmission arms rotatably connected to the left and right sides of each telescopic rod. Each transmission arm includes a second gear, a connecting rod, and a vertical rod. The second gear cooperates with the second rack on the corresponding side of the cross push rod. One side of the connecting rod is fixed to the second gear, and the other side of the connecting rod is vertically fixed to the vertical rod. All vertical rods on the same side are connected to a slide bar at their upper ends. A storage tray is provided on the left and right sides of each telescopic rod. A guide rail is installed at the bottom of the storage tray near the telescopic rod. The slide bar is movably engaged in the corresponding guide rail, and the upper end of the vertical rod is slidably connected to the slide bar.

[0010] The rotation axis of the transmission arm and the telescopic rod is collinear with the rotation axis of the second gear; the base is provided with a strip-shaped through hole, through which the storage tray extends or retracts.

[0011] The base has limit guide grooves on the upper and lower sides of its front and rear ends, and each telescopic rod has a limit block fixed on its upper and lower sides. The limit block is slidably disposed in the limit guide groove.

[0012] The foot cup is vertically threaded to the end of the telescopic rod away from the cross push rod, and a handle is also provided at the upper end of the foot cup.

[0013] The first gear has a limiting disc fixed on both its upper and lower sides, and the two limiting discs are sandwiched between the upper and lower sides of the first rack.

[0014] The second rack of the cross push rod is engaged with the second gear of the transmission arm.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a movable gantry for the maintenance of small motors, which has the following advantages: This movable gantry for small motor maintenance uses a rotating adjustment handwheel to drive the transmission mechanism, which extends the telescopic rod. The foot cups are then rotated to lower the gantry and support the ground, improving its stability and anti-tilting ability when parked. This effectively solves the safety hazard of existing technology that relies solely on casters for support, which is prone to swaying and displacement.

[0016] This movable gantry for small motor maintenance uses the second rack on the cross push rod to drive the transmission arm and storage tray to unfold synchronously during the extension of the telescopic rod. The storage tray automatically extends from the side of the base, providing temporary storage space for maintenance tools and disassembled small parts. This achieves a one-time operation linkage of stable support and temporary storage functions, simplifying the work process and improving maintenance efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the base in this invention; Figure 4 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a schematic diagram of the transmission mechanism in this invention; Figure 6 This is a schematic diagram of the cooperation structure between the temporary storage component and the base in this invention; Figure 7 This is a schematic diagram of the temporary storage component structure in this invention; Figure 8 This is a side view of the internal structure of the base after partial sectioning in this invention.

[0018] In the diagram: 1. Lifting beam; 2. Column; 3. Base; 4. Suspension device; 5. Support assembly; 6. Temporary storage assembly; 7. Casters; 301. Strip-shaped through hole; 302. Limiting guide groove; 303. Strip-shaped protrusion; 501. Adjusting handwheel; 502. Worm gear; 503. First transmission component; 5031. Rotating shaft; 5032. Worm gear; 5033. First gear; 5034. Limiting... 504. Disc; 505. First rack; 506. Push plate; 507. Groove; 508. Telescopic rod; 509. Limiting block; 5000. Foot cup; 6001. Storage tray; 6011. Guide rail; 602. Sliding bar; 603. Transmission arm; 6031. Second gear; 6032. Connecting rod; 6033. Vertical rod; 604. Cross push rod; 6041. Second rack; 605. Spring. Detailed Implementation

[0019] 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.

[0020] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] Please see Figure 1-8The present invention provides a movable gantry for the maintenance of small motors, including a lifting beam 1 and columns 2 installed at both ends of the lifting beam 1. The bottom of each column 2 is fixedly installed with a base 3. The bottom of the base 3 is provided with a universal wheel 7 with brake. The lifting beam 1 is provided with a suspension device 4. The base 3 is internally provided with a support component 5 and two sets of temporary storage components 6; The support assembly 5 includes an adjusting handwheel 501, a transmission mechanism connected to the adjusting handwheel 501, and a support foot assembly connected to the transmission mechanism. The support foot assembly has a foot cup 507. The temporary storage component 6 includes a storage tray 601, which is connected to the support leg component via a linkage mechanism.

[0023] In this embodiment, the transmission mechanism includes a worm gear 502 and a first transmission component 503. The first transmission component 503 includes a rotating shaft 5031, a worm wheel 5032, and a first gear 5033. The upper and lower ends of the rotating shaft 5031 are rotatably connected to the inner wall of the base 3. The worm wheel 5032 and the first gear 5033 are coaxially fixed on the rotating shaft 5031. The worm wheel 5032 cooperates with the worm gear 502. One end of the adjusting handwheel 501 is fixedly connected to the worm gear 502, and the other end of the worm gear 502 is rotatably connected to the base 3. The transmission mechanism also includes two first racks 504. The two first racks 504 are located on different sides of the first gear 5033 and are arranged parallel to each other. The first gear 5033 cooperates with the two first racks 504. The distal ends of the two first racks 504 are respectively connected to push plates 505, and the push plates 505 are slidably disposed in the base 3.

[0024] It should be noted that the transmission mechanism adopts a transmission method in which a worm gear 502 and a worm wheel 5032 cooperate. The worm wheel 5032 and the first gear 5033 are coaxially fixed on the rotating shaft 5031. When the adjusting handwheel 501 is rotated, the worm gear 502 drives the worm wheel 5032 to rotate, which in turn drives the first gear 5033 to rotate. The two first racks 504 are located on opposite radial sides of the first gear 5033 and are parallel to each other, so that when the first gear 5033 rotates, it can simultaneously drive the two first racks 504 to move linearly in opposite directions, thereby driving the push plate 505 to move synchronously in opposite directions or towards each other.

[0025] In this embodiment, the push plate 505 has a groove 5051, and the base 3 has a strip-shaped protrusion 303 inside. The groove 5051 cooperates with the strip-shaped protrusion 303, and the push plate 505 slides along the strip-shaped protrusion 303. Each push plate 505 has a cross push rod 604 fixedly connected to its opposite end. The support foot assembly includes two telescopic rods 506, which are movably inserted into each of the two cross push rods 604 in a one-to-one correspondence. Each telescopic rod 506 corresponds to a set of temporary storage components 6.

[0026] It should be noted that the groove 5051 at the bottom of the push plate 505 forms a sliding guide engagement with the strip-shaped protrusion 303 inside the base 3, ensuring that the push plate 505 maintains linear movement without deflection during operation. The cross-shaped push rod 604 fixedly connected to the opposite end of the push plate 505 adopts a cross-shaped cross-section design, which facilitates the movable insertion with the telescopic rod 506 and provides an installation surface for the second racks 6041 on both sides. Each push plate 505 corresponds to one telescopic rod 506 (one in the front and one in the back direction of the base 3), thus providing support and storage functions on both sides of the base 3 simultaneously.

[0027] In this embodiment, the upper and lower ends of the cross push rod 604 are slidably engaged with the telescopic rod 506. A spring 605 is provided inside the telescopic rod 506. One end of the spring 605 is fixed to the inner wall of the telescopic rod 506, and the other end is fixed to the end of the cross push rod 604. A second rack 6041 is provided on both sides of the cross push rod 604.

[0028] It should be noted that the upper and lower ends of the cross rod 604 slide against the inner wall of the telescopic rod 506, allowing the cross rod 604 to move axially within the telescopic rod 506. One end of the spring 605 abuts against and is fixedly connected to the inner wall of the telescopic rod 506, and the other end abuts against and is fixedly connected to the end of the cross rod 604. The second racks 6041 on both sides of the cross rod 604 mesh with the second gear 6031 on the transmission arm 603, converting the linear motion of the cross rod 604 into the rotational motion of the transmission arm 603.

[0029] In this embodiment, the linkage mechanism includes multiple transmission arms 603 rotatably connected to the left and right sides of each telescopic rod 506. Each transmission arm 603 includes a second gear 6031, a connecting rod 6032, and a vertical rod 6033. The second gear 6031 cooperates with the second rack 6041 on the corresponding side of the cross push rod 604. One side of the connecting rod 6032 is fixed to the second gear 6031, and the other side of the connecting rod 6032 is vertically fixed to the vertical rod 6033. All vertical rods 6033 on the same side are connected to a slide bar 602 at their upper ends. A storage tray 601 is provided on the left and right sides of each telescopic rod 506. A guide rail 601 is installed at the bottom of the storage tray 601 near the telescopic rod 506. The slide bar 602 is movably engaged in the corresponding guide rail 6011, and the upper end of the vertical rod 6033 is slidably connected to the slide bar 602.

[0030] It should be noted that each telescopic rod 506 has a set of transmission arms 603 on both its left and right sides. Each set of transmission arms 603 can have two or more to ensure uniform force distribution on the storage tray 601. The transmission arm 603 is an integrated structure consisting of a second gear 6031, a connecting rod 6032, and a vertical rod 6033. The second gear 6031 meshes with the second rack 6041 on the cross push rod 604. When the cross push rod 604 moves axially, the second gear 6031 drives the entire transmission arm 603 to rotate around the axis of rotation of the telescopic rod 506, while the vertical rod 6033 pushes the slide bar 602 upwards. The slide bar 602 is simultaneously connected to multiple vertical rods 6033 and slidably engages with the guide rail 6011 at the bottom of the storage tray 601, allowing the transmission arm 603 to smoothly extend out of the storage tray 601. Furthermore, the slide bar 602 is slidably connected to the upper end of the vertical rod 6033, compensating for the horizontal displacement component in the movement trajectory of the vertical rod 6033.

[0031] In this embodiment, the rotation axis of the transmission arm 603 and the telescopic rod 506 is collinear with the rotation axis of the second gear 6031; the base 3 is provided with a strip-shaped through hole 301, and the storage tray 601 extends or retracts through the strip-shaped through hole 301.

[0032] It should be noted that the rotation axes of the transmission arm 603 and the telescopic rod 506 are collinear with the rotation axis of the second gear 6031, ensuring transmission efficiency and motion accuracy. The length and width of the strip-shaped through hole 301 on the base 3 match the storage tray 601. When retracted, the storage tray 601 is completely retracted into the base 3, and when unfolded, it extends horizontally outward from the strip-shaped through hole 301, facilitating the placement of tools and parts without occupying extra space.

[0033] In this embodiment, the upper and lower sides of the front and rear ends of the base 3 are provided with limiting guide grooves 302, and the upper and lower sides of each telescopic rod 506 are fixed with limiting blocks 5061, which are slidably disposed in the limiting guide grooves 302.

[0034] It should be noted that the limiting guide grooves 302 on the upper and lower sides of the front and rear ends of the base 3, together with the limiting blocks 5061 on the upper and lower sides of the telescopic rod 506, constitute a travel limiting mechanism. When the telescopic rod 506 extends outward under the push of the cross push rod 604, the limiting block 5061 slides along the limiting guide groove 302 until it abuts against the end of the limiting guide groove 302, at which point the telescopic rod 506 reaches its maximum extension length. This limiting structure not only prevents the telescopic rod 506 from over-extending and dislodging, but also provides a triggering condition for the subsequent independent sliding of the cross push rod 604 relative to the telescopic rod 506.

[0035] In this embodiment, the foot cup 507 is vertically threaded to the end of the telescopic rod 506 away from the cross push rod 604, and a handle is also provided on the upper end of the foot cup 507.

[0036] It should be noted that the foot cup 507 and the end of the telescopic rod 506 furthest from the cross push rod 604 are connected by a vertical thread. When the foot cup 507 is rotated or rotated via the handle, the foot cup 507 moves up and down relative to the telescopic rod 506, thereby adjusting the contact state between the bottom of the foot cup 507 and the ground. When the device needs to be fixed, the foot cup 507 is rotated to lower it below the bottom surface of the caster 7, supporting the entire gantry frame, lifting the caster 7 off the ground, and achieving stable support; when moving, the foot cup 507 is rotated in the opposite direction to raise it, and the caster 7 returns to the ground.

[0037] In this embodiment, a limiting disk 5034 is fixed on both the upper and lower sides of the first gear 5033, and the two limiting disks 5034 are sandwiched between the upper and lower sides of the first rack 504.

[0038] It should be noted that the limiting discs 5034 on the upper and lower sides of the first gear 5033 respectively clamp the upper and lower surfaces of the first rack 504, preventing the first rack 504 from disengaging from the first gear 5033 during movement, thus ensuring the reliability of the transmission. The limiting discs 5034 rotate synchronously with the first gear 5033, forming a stable guide with the first rack 504.

[0039] In this embodiment, the second rack 6041 of the cross push rod 604 is engaged with the second gear 6031 of the transmission arm 603.

[0040] It should be noted that the second rack 6041 of the cross push rod 604 and the second gear 6031 of the transmission arm 603 are always engaged. Regardless of the axial position of the cross push rod 604 relative to the telescopic rod 506, the second rack 6041 and the second gear 6031 will not disengage. This ensures that during the extension of the telescopic rod 506, when the telescopic rod 506 is blocked by the limiting guide groove 302, the cross push rod 604 can immediately drive the transmission arm 603 to rotate as it continues to move; during the retraction process, when the cross push rod 604 moves in the opposite direction, it can also immediately drive the transmission arm 603 to reverse, causing the storage tray 601 to retract.

[0041] In summary, this movable gantry for small motor maintenance, by rotating the adjustment handwheel 501 to drive the transmission mechanism to extend the telescopic rod 506, and then rotating the foot cup 507 to lower it to support the ground, improves the stability and anti-tilting ability of the gantry when parked, and effectively solves the safety hazard of easy swaying and displacement caused by the existing technology that relies solely on the universal wheels 7 for support.

[0042] This movable gantry for small motor maintenance uses the second rack 6041 on the cross push rod 604 to drive the transmission arm 603 and storage tray 601 to extend synchronously during the extension of the telescopic rod 506. This allows the storage tray 601 to automatically extend from the side of the base 3, providing temporary storage space for maintenance tools and disassembled small parts. This achieves a one-time operation linkage between stable support and temporary storage functions, simplifying the work process and improving maintenance efficiency.

[0043] Working principle: In the initial state, the casters 7 are on the ground, the telescopic rod 506 is fully retracted into the base 3, the feet 507 are in a high position and not in contact with the ground, and the storage tray 601 is also fully retracted into the base 3. When the gantry is moved to the maintenance position and needs to be fixed, the operator rotates the adjusting handwheel 501. The adjusting handwheel 501 drives the worm gear 502 to rotate, and the worm gear 502 drives the worm wheel 5032 and the coaxial first gear 5033 to rotate. The first gear 5033 simultaneously meshes with two parallel and oppositely oriented first racks 504, causing the two first racks 504 to move in opposite directions in the front-back direction of the base 3, pushing the push plate 505 to slide along the strip-shaped protrusion 303. The push plate 505 drives the cross push rod 604 fixedly connected to it to move outward together.

[0044] A cross-shaped push rod 604 is inserted into the telescopic rod 506 and elastically connected to it via a spring 605. When the telescopic rod 506 is not externally constrained, the cross-shaped push rod 604 transmits thrust to the telescopic rod 506 via the spring 605, causing the entire telescopic rod 506 to extend outwards. During the extension process, the upper and lower limit blocks 5061 slide along the limit guide grooves 302 within the base 3, guiding the telescopic rod 506 to maintain linear movement. When the limit blocks 5061 slide to the end of the limit guide grooves 302, the telescopic rod 506 reaches its maximum extension length. At this point, the foot cups 507 are located outside the caster wheels 7 but have not yet contacted the ground.

[0045] Continuing to rotate the adjusting handwheel 501 in the same direction, since the telescopic rod 506 can no longer move outward, the cross push rod 604 begins to slide inward relative to the telescopic rod 506, overcoming the elastic force of the spring 605, and the spring 605 is further compressed. While the cross push rod 604 slides, the second racks 6041 on both sides drive the second gear 6031 meshing with it to rotate, and the second gear 6031 drives the entire transmission arm 603 to rotate outward around the axis of rotation. The vertical rod 6033 at the upper end of the transmission arm 603 pushes the storage tray 601 to extend horizontally outward along the strip-shaped through hole 301 on the base 3 through the slide bar 602. The slide bar 602 slides within the guide rail 6011 at the bottom of the storage tray 601, while the upper end of the vertical rod 6033 is slidably connected to the slide bar 602 to accommodate fine adjustments to the movement trajectory. After the storage tray 601 is fully extended, the operator can rotate the handle on the foot cup 507 to move the foot cup 507 downward until it touches the ground, lifting the entire gantry frame and lifting the casters 7 off the ground. At this time, the foot cup 507 forms a stable support with the ground.

[0046] Conversely, when the gantry needs to be moved, first rotate the foot cup 507 in the reverse direction to raise it off the ground, allowing the caster wheel 7 to re-land, and then rotate the adjusting handwheel 501 in the reverse direction. The cross push rod 604 first retracts outward relative to the telescopic rod 506, and the second rack 6041 drives the transmission arm 603 to rotate in the reverse direction, causing the storage tray 601 to retract into the base 3. After the storage tray 601 is fully retracted, the cross push rod 604 pulls the telescopic rod 506 inward through the spring 605, and the limiting block 5061 slides in the reverse direction along the limiting guide groove 302 until the telescopic rod 506 is fully retracted into the base 3, and the foot cup 507 also retracts inward, restoring the device to its moving state. Throughout the process, the self-locking characteristics of the worm gear 5032 and worm 502 ensure that the positions of each component remain stable after the adjusting handwheel 501 stops rotating, and will not move on its own due to external force or its own weight.

[0047] 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 movable gantry for the maintenance of small motors, comprising a lifting beam and columns installed at both ends of the lifting beam, each column having a base fixedly installed at its bottom, the base having casters with brakes at its bottom, and a suspension device installed on the lifting beam, characterized in that: The base is internally equipped with a support assembly and two sets of temporary storage assemblies; The support assembly includes an adjustment handwheel, a transmission mechanism connected to the adjustment handwheel, and a support foot assembly connected to the transmission mechanism, wherein the support foot assembly has foot cups; The temporary storage component includes a storage tray, which is connected to the support leg component via a linkage mechanism.

2. The movable gantry crane for small motor maintenance according to claim 1, characterized in that, The transmission mechanism includes a worm gear and a first transmission component. The first transmission component includes a rotating shaft, a worm wheel, and a first gear. The upper and lower ends of the rotating shaft are rotatably connected to the inner wall of the base. The worm wheel and the first gear are coaxially fixed on the rotating shaft. The worm wheel cooperates with the worm gear. One end of the adjusting handwheel is fixedly connected to the worm gear, and the other end of the worm gear is rotatably connected to the base. The transmission mechanism also includes two first racks, which are located on different sides of the first gear and are arranged parallel to each other. The first gear cooperates with the two first racks. The distal ends of the two first racks are respectively connected to push plates, which are slidably disposed within the base.

3. The movable gantry for small motor maintenance according to claim 2, characterized in that, The push plate has a groove, and the base has a strip-shaped protrusion inside. The groove and the strip-shaped protrusion cooperate, and the push plate slides along the strip-shaped protrusion. Each push plate has a cross push rod fixedly connected to its opposite end. The support foot assembly includes two telescopic rods, which are movably connected to the two cross push rods respectively. Each telescopic rod corresponds to a set of temporary storage components.

4. The movable gantry crane for small motor maintenance according to claim 3, characterized in that, The upper and lower ends of the cross push rod are slidably engaged with the telescopic rod. A spring is installed inside the telescopic rod. One end of the spring is fixed to the inner wall of the telescopic rod, and the other end is fixed to the end of the cross push rod. A second toothed rack is provided on both sides of the cross push rod.

5. The movable gantry crane for small motor maintenance according to claim 4, characterized in that, The linkage mechanism includes multiple transmission arms rotatably connected to the left and right sides of each telescopic rod. Each transmission arm includes a second gear, a connecting rod, and a vertical rod. The second gear cooperates with the second rack on the corresponding side of the cross push rod. One side of the connecting rod is fixed to the second gear, and the other side of the connecting rod is vertically fixed to the vertical rod. All vertical rods on the same side are connected to a slide bar at their upper ends. A storage tray is provided on the left and right sides of each telescopic rod. A guide rail is installed at the bottom of the storage tray near the telescopic rod. The slide bar is movably engaged in the corresponding guide rail, and the upper end of the vertical rod is slidably connected to the slide bar.

6. The movable gantry crane for small motor maintenance according to claim 5, characterized in that, The rotation axis of the transmission arm and the telescopic rod is collinear with the rotation axis of the second gear; the base is provided with a strip-shaped through hole, through which the storage tray extends or retracts.

7. The movable gantry for small motor maintenance according to claim 3, characterized in that, The upper and lower sides of the front and rear ends of the base are provided with limiting guide grooves, and each telescopic rod is fixed with a limiting block on its upper and lower sides. The limiting block is slidably disposed in the limiting guide groove.

8. The movable gantry crane for small motor maintenance according to claim 3, characterized in that, The foot cup is vertically threaded to the end of the telescopic rod away from the cross push rod, and a handle is also provided at the upper end of the foot cup.

9. The movable gantry crane for small motor maintenance according to claim 2, characterized in that, The first gear has a limiting disc fixed on both its upper and lower sides, and the two limiting discs are sandwiched between the upper and lower sides of the first rack.

10. The movable gantry crane for small motor maintenance according to claim 4, characterized in that, The second rack of the cross push rod is engaged with the second gear of the transmission arm.

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