A quick-change attachment structure for a skid loader

Abstract

This utility model relates to the technical field of skid steer loader accessories, specifically a quick-change attachment structure for skid steer loaders. It includes a mounting frame on which a beveled insert plate, a beveled square base quick-change insert plate, and a spring positioning plate are fixedly mounted. The mounting frame is hinged to the loader bucket cylinder and the boom end fork via pins, forming a rigid support base. A beveled cylinder rotatably passes through a mounting hole in the mounting frame, with an external spring providing a return force. A rotating handle is connected to the beveled cylinder via an elastic cylindrical pin, driving it to slide along the beveled surface of the square base. In this utility model, the beveled insert plate conforms to the lower edge of the bucket ramp for guidance, and the quick-change insert plate is flush with the attachment quick-change positioning plate. Rotating the handle raises and lowers the beveled cylinder, which is then locked in place by the spring. Combined with inserting the rotating handle into the attachment positioning hole, quick installation and removal of the attachment are achieved. The operation is convenient, the connection is stable, and it significantly improves the efficiency and reliability of attachment replacement.

Description

Technical Field

[0001] This utility model relates to the technical field of skid steer loader accessories, specifically a quick-change structure for skid steer loader attachments. Background Technology

[0002] Skid steer loaders, as a type of multi-functional construction machinery, are widely used in infrastructure construction, industrial operations, urban streets, residential areas, and airport runways. They offer the advantage of flexible operation in confined spaces, enabling functions such as on-the-spot rotation, cargo loading and unloading, site clearing, and material transfer. They are often used as auxiliary equipment for large construction machinery. Taking the HY380 skid steer loader as an example, it mainly consists of the main frame, boom, quick-change body, bucket, engine, gear pump, distribution valve, travel motor, hydraulic cylinders, and tracks. During operation, the engine drives a double gear pump via a flexible coupling to convert mechanical energy into hydraulic energy, which is then transmitted to the travel motor, boom cylinder, and bucket cylinder via the distribution valve, thereby achieving boom lifting, bucket movement, and overall machine travel.

[0003] In actual operation, skid steer loaders require frequent attachment changes (such as buckets, augers, breakers, log grapples, etc.) to adapt to different working conditions. However, the attachment changing methods of similar equipment in China currently have significant drawbacks: traditional designs do not adopt a unified quick-change structure, requiring manual disassembly of components such as the bucket cylinder, boom cylinder, and boom fork swivel pin during replacement; due to the heavy weight of the attachments, manual operation is time-consuming and labor-intensive, resulting in low efficiency and high safety risks. Therefore, a more efficient and safer quick-change attachment structure is urgently needed to solve these problems.

[0004] Chinese Patent No. CN222252293U discloses a novel quick-change device for skid steer loader attachments, comprising a crossbeam, a carrier frame, and a connecting seat. Carrier frames are fixedly mounted on both sides of the crossbeam. An installation groove is provided within the crossbeam, and a sliding plate is slidably connected within the installation groove. A connecting rod is fixedly mounted at the bottom end of the sliding plate, and a base plate is fixedly mounted at the bottom end of the connecting rod. A bracket is fixedly mounted at the front end of the base plate. Sliding grooves are provided on both sides of the installation groove within the crossbeam. Each of the two carrier frames has a storage groove. The two sliding grooves extend to the corresponding carrier frames on opposite sides, and their top ends communicate with the corresponding storage grooves. A slider is slidably connected within each of the two sliding grooves. This novel quick-change device for skid steer loader attachments allows for rapid assembly and disassembly of the bucket and carrier frame, thereby improving assembly efficiency and facilitating subsequent disassembly and replacement. It also avoids the problems associated with bolted connections, which can lead to bolt corrosion and difficulty in disassembly after long-term use. The aforementioned device adopts a sliding connection structure of sliding plate, connecting rod, base plate and bracket. Its core load-bearing component is a cantilever design. In actual operation of skid steer loaders, it is susceptible to high-frequency impact loads. The sliding plate and connecting rod of the cantilever structure may deform or the slider may fall off due to stress concentration, resulting in loose connection or even failure. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned prior art, improve the efficiency of skid steer loader attachment replacement, and improve the connection strength between attachments and skid steer loader.

[0006] The technical solutions adopted in this utility model are as follows:

[0007] A quick-change attachment structure for a skid steer loader, used for quickly attaching attachments to the loader.

[0008] Includes a mounting bracket; the mounting bracket is fixedly equipped with a beveled insert plate, a beveled square base, a quick-change insert plate, and a spring positioning plate;

[0009] The mounting bracket has a mounting hole, the oblique cylinder is rotatably inserted into the mounting hole, and the spring is sleeved on the oblique cylinder and abuts against the mounting bracket and the oblique cylinder.

[0010] The rotating handle is connected to the end of the beveled cylinder by a flexible cylindrical pin, and the flexible cylindrical pin is interference-fitted into the hole of the rotating handle and mates with the corresponding hole of the beveled cylinder.

[0011] The middle part of the mounting bracket is hinged to the fixing hole of the bucket cylinder by a pin, and the two sides are hinged to the holes of the fork arm at the end of the boom by pins.

[0012] The end of the mounting bracket away from the loader is fitted with the lower edge of the bucket ramp of the attachment via a beveled insert plate. The lower edge of the quick-change insert plate is flush with the upper edge of the quick-change limiting plate of the attachment, and the rotating handle is inserted into the rotating handle limiting hole of the attachment.

[0013] By adopting the above technical solution, the mounting frame, as the core support component, is hinged to the bucket cylinder fixing hole via a central pin and to the fork arm holes at the end of the boom via pins on both sides, forming a stable rigid connection foundation with the loader body and ensuring the reliability of the structure under stress. The obliquely cut insert plate fixed on the mounting frame mates with the lower edge of the bucket oblique plate of the attachment, automatically guiding alignment during attachment installation and avoiding manual adjustment; the lower edge of the quick-change insert plate is flush with the upper edge of the quick-change limiting plate of the attachment, forming a horizontal positioning surface, limiting the horizontal displacement of the attachment, and enhancing connection stability; the obliquely cut cylinder can rotatably pass through the mounting hole of the mounting frame, and an externally fitted spring abuts against the mounting frame and the obliquely cut cylinder, providing a restoring elastic force; the rotating handle is connected to the end of the obliquely cut cylinder via an elastic cylindrical pin, accurately transmitting the rotational force of the handle to the obliquely cut cylinder, driving it to slide along the oblique surface of the obliquely cut square base. When the handle is rotated, the beveled cylinder rises to release the lock, allowing for quick attachment disassembly. Reversing the operation, the spring pushes the beveled cylinder downwards to reset, locking the attachment by engaging the beveled surface. Simultaneously, rotating the handle inserts it into the attachment's rotating handle limit hole, creating multiple constraints. This avoids the cumbersome steps of disassembling cylinders and bolts required for traditional attachment replacements; simply rotating the handle completes the unlocking and locking of the attachment, significantly reducing replacement time. Furthermore, the multiple positioning designs—beveled surface engagement, horizontal engagement, and handle insertion—effectively disperse impact loads during operation, enhancing the connection strength between the attachment and the loader, balancing ease of operation with structural reliability.

[0014] Furthermore, the outer edge of the obliquely cut cylinder is provided with an elliptical edge, and the obliquely cut square base is provided with an inclined surface that slides in conjunction with the elliptical edge.

[0015] By adopting the above technical solution, when the handle drives the obliquely cut cylinder to rotate, its outer elliptical edge slides along the inclined surface of the obliquely cut square base, converting the rotational motion of the handle into the rising or falling motion of the obliquely cut cylinder. When rising, the locking constraint on the attachment is released; when falling, the attachment is securely locked through the contact of the inclined surface. The surface contact between the edge and the inclined surface ensures smooth movement and disperses the impact load during operation by increasing the contact area, reducing localized wear and extending the service life of the components. Simultaneously, the contour design of the elliptical edge allows for precise control of the displacement of the obliquely cut cylinder, ensuring clear switching between unlocked and locked states, further improving the operational reliability and connection strength of attachment replacement.

[0016] Furthermore, the elastic cylindrical pin is interference-fitted into the hole of the rotating handle and is limit-fitted with the corresponding hole of the oblique cylinder.

[0017] By adopting the above technical solution, the interference fit creates a rigid connection between the elastic cylindrical pin and the hole of the rotating handle, preventing them from loosening or separating during frequent rotation operations. This ensures that the rotational force of the rotating handle can be completely transmitted to the oblique cylinder. At the same time, the limiting fit between the elastic cylindrical pin and the corresponding hole of the oblique cylinder restricts the axial displacement of the oblique cylinder and constrains the radial relative movement, ensuring that the oblique cylinder and the rotating handle rotate synchronously. This avoids slippage or misalignment and directly and efficiently converts the motion of the oblique cylinder into the movement of the oblique cylinder. This simplifies the operation process and improves the reliability of attachment replacement. Even in high-frequency, high-load operating environments, the linkage consistency between the rotating handle and the oblique cylinder can be maintained, ensuring the accuracy of attachment locking and unlocking actions and extending the service life of the structure.

[0018] Furthermore, the lower edge of the quick-change insert plate is flush with the upper edge of the quick-change limiting plate of the attachment.

[0019] By adopting the above technical solution, when the attachment is connected to the mounting frame, the lower edge of the quick-change insert plate and the upper edge of the attachment quick-change limiting plate are completely flush, forming a horizontal positioning reference surface. This surface contact design effectively limits the relative displacement of the attachment in the horizontal direction, preventing the attachment from shifting or loosening due to impact loads during operation, and enhancing the connection strength between the attachment and the loader. At the same time, the flush state provides a direct alignment reference for the subsequent insertion of the rotating handle into the attachment limiting hole. Only when the two are completely flush can the rotating handle be accurately inserted into the limiting hole to complete the locking, ensuring that the attachment is installed in place and avoiding locking failure or loose connection due to incomplete contact. This simplifies the alignment operation during installation and improves the stability of the connection through the rigid constraint of the surface contact, taking into account both operational convenience and structural reliability.

[0020] Furthermore, the spring is disposed between the obliquely cut cylinder and the mounting bracket.

[0021] By adopting the above technical solution, when the handle drives the beveled cylinder to rotate and rise, the spring is compressed and stores elastic potential energy. After the attachment is removed or replaced, releasing the handle releases the spring force, pushing the beveled cylinder to descend and reset, so that its lower surface is once again tightly attached to the beveled surface of the beveled square base, automatically restoring the locked state. This automatic reset mechanism avoids the risk of incomplete locking due to operational negligence, ensuring that the attachment and mounting bracket always maintain a tight connection. At the same time, the spring force continuously acts on the beveled cylinder, which can compensate for the gaps caused by wear between the beveled cylinder and the beveled square base after long-term use, maintaining the tightness of the connection and extending the service life of the structure.

[0022] Furthermore, the shape of the beveled insert plate is adapted to the shape of the lower edge of the bucket bevel plate of the attachment, and they fit together by beveled surfaces.

[0023] By adopting the above technical solution, the shape adaptation and inclined surface fit design of the beveled insert plate and the lower edge of the bucket inclined plate of the attachment achieves high efficiency and stable connection of attachment installation through precise structural matching. When the attachment is docked with the mounting frame, the matching shape of the beveled insert plate can automatically guide it to align with the lower edge of the bucket inclined plate of the attachment, eliminating the need for manual adjustment of angle or position and significantly shortening the installation alignment time. At the same time, the surface contact method of the inclined surface fit increases the contact area between the two, which can effectively disperse the impact load during attachment operation, avoid local stress concentration or deformation caused by point contact, enhance the connection strength between the attachment and the mounting frame, and the guiding characteristics of the inclined surface can also reduce the resistance during installation. When the attachment is close to the mounting frame, the inclined surface of the beveled insert plate and the inclined surface of the lower edge of the bucket inclined plate slide and guide each other, making the attachment more smoothly snap into the installation position and reducing the difficulty of operation. In long-term use, the uniform force of the surface contact also reduces local wear of components and extends the service life of the beveled insert plate and the bucket inclined plate of the attachment.

[0024] This utility model has the following beneficial effects:

[0025] 1. This utility model forms a stable mechanical connection foundation and precise alignment guidance by rigidly connecting the mounting bracket with the loader bucket cylinder fixing hole and the boom end fork hole, combined with the inclined surface fit between the inclined plate and the lower edge of the attachment bucket inclined plate, the flat positioning between the lower edge of the quick-change plate and the upper edge of the attachment quick-change limit plate, and the multiple assembly relationships of rotating the handle and inserting it into the attachment limit hole. This avoids the cumbersome steps of disassembling the cylinder and bolts required for traditional replacement, and realizes quick locking and unlocking of the attachment, significantly improving replacement efficiency.

[0026] 2. This utility model transforms the rotational motion of the handle into the lifting motion of the oblique cylinder by slidingly fitting the elliptical edge of the obliquely cut cylinder with the inclined surface of the obliquely cut square base. The surface contact design disperses the impact load during operation and reduces local wear, extending the service life of the components. At the same time, the displacement is precisely controlled by the elliptical edge contour, ensuring clear switching between unlocking and locking states and improving operational reliability.

[0027] 3. This utility model uses an elastic cylindrical pin that is interference-fitted into the hole of the rotating handle and matched with the corresponding hole of the oblique cylinder to form a rigid linkage between the rotating handle and the oblique cylinder. This avoids loosening or slippage during frequent operation, ensures complete transmission of rotational force, and enables the oblique cylinder to respond synchronously to the handle action. This ensures the accuracy of locking or unlocking the attachment and is suitable for high-frequency, high-load operation scenarios.

[0028] 4. This utility model uses an assembly design in which a spring is sleeved on the outside of the oblique cylinder and abuts against the mounting bracket and the oblique cylinder. Through the storage and release of elastic potential energy, the oblique cylinder is driven to automatically descend and reset and closely adhere to the oblique surface of the oblique square base, avoiding the risk of incomplete locking due to operational negligence. At the same time, the elastic force continuously compensates for the wear gaps from long-term use, maintains the tightness of the connection, and extends the structural maintenance cycle. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0030] Figure 2 This is an assembly diagram of the utility attachment and quick-change mechanism;

[0031] Figure 3 This is an exploded view of the overall structure of this utility model.

[0032] Wherein: 10-Mounting bracket; 11-Beveled insert plate; 12-Beveled square base; 13-Quick-change insert plate; 14-Spring positioning plate; 15-Quick-change limit plate;

[0033] 20 - Spring; 21 - Elastic cylindrical pin;

[0034] 30 - Obliquely cut cylinder;

[0035] 40 - Rotate handle; 41 - Rotate handle limit hole. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0037] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," 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 utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0038] Reference Figure 1 , Figure 2 and Figure 3As can be seen, in this utility model, a quick-change attachment structure for a skid steer loader, the mounting frame 10 is the core supporting foundation of the entire quick-change structure. It is connected to the loader body through two sets of pins. The mounting frame 10 has a pin hole in the middle, which is hinged to the fixing hole of the loader bucket cylinder to form a central support point. The left and right sides of the mounting frame 10 also have pin holes, which are hinged to the holes of the boom end fork arm to form side support points. The following components are fixedly installed on the front end of the mounting frame 10 away from the loader and are rigidly connected to the mounting frame 10 by welding or bolt fastening. The beveled insert 11 is located on one side of the front end of the mounting frame 10, with its bevel facing the attachment direction, and is used to connect with the bucket of the attachment. The beveled surface of the lower edge of the plate fits in place; the beveled square base 12 is set close to the beveled insert plate 11, and a beveled surface is machined on it to match the elliptical edge of the outer edge of the beveled cylinder 30, serving as a guide rail for the sliding of the beveled cylinder 30; the quick-change insert plate 13 is located on the other side of the front end of the mounting bracket 10, and its lower edge is a horizontal surface, used to be flush with the upper edge of the quick-change limiting plate 15 of the attachment; the spring positioning plate 14 is set next to the mounting hole of the mounting bracket 10 to constrain the radial position of the spring 20 and prevent the spring 20 from shifting during compression / reset; the mounting bracket 10 has a through mounting hole in the middle, and the beveled cylinder 30 is rotatably inserted into the mounting hole, that is, the outer wall of the beveled cylinder 30 is clearance-fitted with the inner wall of the mounting hole, allowing it to rotate around the axis. Spring 20 is sleeved on the outside of oblique cylinder 30. One end of spring 20 abuts against the mounting hole end face of mounting bracket 10 or spring positioning piece 14, and the other end abuts against the boss or shoulder of oblique cylinder 30, so that spring 20 is always in a pre-compressed state, providing the oblique cylinder 30 with a restoring force in the direction of oblique square seat 12. Rotating handle 40 is located on the outside of mounting bracket 10 near the operator, and its end is provided with a through hole. The corresponding end of oblique cylinder 30 that protrudes from the mounting bracket 10 is provided with a radial limiting hole. The elastic cylindrical pin 21 is inserted into the through hole of the rotating handle 40 with an interference fit, meaning that the elastic cylindrical pin 21 and the hole wall of the rotating handle 40 are tightly fitted without any looseness or gap. At the same time, both ends of the elastic cylindrical pin 21 are embedded in the limiting holes of the obliquely cut cylinder 30. The oblique surface of the obliquely cut insert plate 11 at the front end of the mounting bracket 10 is completely fitted with the oblique surface of the lower edge of the bucket oblique plate of the attachment, guiding the attachment to slide along the oblique surface to the installation position. The lower edge of the quick-change insert plate 13 is completely flat with the upper edge of the quick-change limiting plate 15 of the attachment, forming a horizontal surface contact constraint, which restricts the horizontal displacement of the attachment to the left, right or front and back. The rotating handle 40 is inserted into the rotating handle limiting hole 41 of the attachment. At the same time, under the elastic force of the spring 20, the elliptical edge of the obliquely cut cylinder 30 slides along the oblique surface of the obliquely cut square seat 12 to the lowest point, so that the lower surface of the obliquely cut cylinder 30 is tightly fitted with the oblique surface of the obliquely cut square seat 12, and finally the attachment is securely locked.

[0039] In one embodiment, the operator controls the loader to approach the attachment to be installed, adjusts the boom height so that the front end of the mounting frame 10 is aligned with the attachment connection interface. At this time, the beveled insert 11 on the mounting frame 10 automatically guides the two to align because its shape matches the beveled surface of the lower edge of the attachment bucket bevel. When the attachment approaches, the beveled surface of the beveled insert 11 slides and fits against the beveled surface of the lower edge of the attachment bucket bevel, quickly completing the initial alignment without manual adjustment of angle or position. At the same time, the lower edge of the quick-change insert 13 on the mounting frame 10 is simultaneously flush with the upper edge of the quick-change limiting plate 15 of the attachment. The surface contact of the two forms a horizontal positioning reference, limiting the displacement of the attachment in the horizontal direction, such as left and right swaying or forward and backward sliding, ensuring that the attachment and the mounting frame 10 are completely aligned in the horizontal direction, providing a stable foundation for subsequent locking operations. After the beveled insert 11 is flush with the beveled surface of the attachment and the quick-change insert 13 is flush with the limiting plate 15, the operator rotates the rotating handle 40. The rotational force is transmitted to the oblique cylinder 30 through the elastic cylindrical pin 21, which is interference-fitted into the hole and correspondingly positioned in the hole of the oblique cylinder 30. This drives the oblique cylinder 30 to rotate around the mounting hole of the mounting bracket 10. The elliptical edge of the outer edge of the oblique cylinder 30 slides along the inclined surface of the oblique square base 12, causing the oblique cylinder 30 to move upward and compress the spring 20 sleeved on it to store elastic potential energy. After the oblique cylinder 30 rises to a sufficient height, the temporary constraint on the attachment is released. The operator aligns the rotating handle 40 with the rotating handle limiting hole 41 of the attachment and inserts it completely. After inserting the rotating handle 40, the operator releases the handle. At this time, the spring 20 releases its elastic potential energy, pushing the obliquely cut cylinder 30 to slide downwards along the oblique surface of the obliquely cut square base 12 and reset. Finally, the lower surface of the obliquely cut cylinder 30 fits tightly with the oblique surface of the obliquely cut square base 12, and the rotating handle 40 is fully embedded in the limiting hole 41 of the attachment, completing the installation of the attachment and the loader. The entire process only requires the operator to adjust the position of the loader, rotate the handle and insert it into the limiting hole. There is no need to disassemble the cylinder or bolts. The oblique surface guide of the oblique insert plate 11, the horizontal positioning of the quick-change insert plate 13 and the limiting plate 15, and the automatic reset function of the spring 20 together shorten the alignment and locking time, achieving efficient installation of the attachment.

[0040] Working Principle: First, the mounting frame 10, as the core support component, is hinged to the fixing hole of the loader bucket cylinder via a central pin, and hinged to the holes of the forks at the end of the boom via pins on both sides, forming a stable three-point support structure. This ensures a rigid connection between the device and the loader body, providing a solid mechanical foundation for attachment installation. When the attachment needs to be installed, the loader approaches the attachment and adjusts the boom height. The beveled insert 11 at the front end of the mounting frame 10, because it matches the beveled shape of the lower edge of the attachment bucket bevel, automatically guides the two to align. When the attachment approaches, the beveled insert 11... The inclined surface slides and engages with the lower edge of the bucket inclined plate of the attachment, completing the initial guiding alignment. At the same time, the lower edge of the quick-change insert plate 13 on the mounting frame 10 is flush with the upper edge of the quick-change limiting plate 15 of the attachment, forming a horizontal positioning surface, restricting the horizontal displacement of the attachment, and ensuring that the attachment and the mounting frame 10 are completely aligned in the horizontal direction, providing a precise foundation for locking. After the installation and alignment are completed, the operator rotates the handle 40, and the elastic cylindrical pin 21, which is interference-fitted in the handle hole and correspondingly limited by the hole of the oblique cylinder 30, transmits the rotational force to the oblique cylinder. The body 30 is driven to rotate around the mounting hole of the mounting bracket 10. The elliptical edge of the outer edge of the obliquely cut cylinder 30 slides along the inclined surface of the obliquely cut square base 12, converting the rotational motion into a lifting action. When unlocking, rotating the handle causes the obliquely cut cylinder 30 to rise and compress the sleeved spring 20 to store elastic potential energy, releasing its constraint on the attachment. At this time, the attachment can be removed. When locking, after inserting the attachment, rotating the handle in the opposite direction causes the spring 20 to release its elastic potential energy, pushing the obliquely cut cylinder 30 to descend and reset. Its lower surface is tightly fitted with the inclined surface of the obliquely cut square base 12. The rotating handle 40 is inserted into the rotating handle limit hole 41 of the attachment to ensure a secure connection between the attachment and the mounting bracket 10. In addition, the spring 20 is sleeved on the outside of the beveled cylinder 30 and abuts against the mounting bracket 10 and the beveled cylinder 30. When unlocking, it compresses and stores elastic potential energy, and when locking, it releases the elastic force to push the beveled cylinder 30 to automatically reset, avoiding the risk of incomplete locking due to operational negligence. At the same time, the elastic force continuously compensates for the gap between the beveled cylinder 30 and the beveled square seat 12 caused by wear, maintaining the tightness of the connection and ensuring the reliability of long-term use.

[0041] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A quick-change attachment structure for a skid steer loader, used for quickly installing attachments onto the loader, characterized in that: Includes a mounting bracket (10); the mounting bracket (10) is fixedly provided with a beveled insert plate (11), a beveled square base (12), a quick-change insert plate (13), and a spring positioning plate (14); The mounting bracket (10) has a mounting hole, and the oblique cylinder (30) is rotatably inserted into the mounting hole. The spring (20) is sleeved on the oblique cylinder (30) and abuts against the mounting bracket (10) and the oblique cylinder (30). The rotating handle (40) is connected to the end of the oblique cylinder (30) by means of an elastic cylindrical pin (21). The elastic cylindrical pin (21) is interference-fitted into the hole of the rotating handle (40) and engages with the corresponding hole of the oblique cylinder (30). The middle part of the mounting bracket (10) is hinged to the fixing hole of the bucket cylinder by a pin, and the two sides are hinged to the holes of the boom end fork arm by pins. The end of the mounting bracket (10) away from the loader is engaged with the lower edge of the bucket ramp of the attachment via a slanted insert plate (11). The lower edge of the quick-change insert plate (13) is flush with the upper edge of the quick-change limiting plate (15) of the attachment, and the rotating handle (40) is inserted into the rotating handle limiting hole (41) of the attachment.

2. The quick-change attachment structure according to claim 1, characterized in that: The outer edge of the obliquely cut cylinder (30) is provided with an elliptical edge, and the obliquely cut square base (12) is provided with an inclined surface that slides with the elliptical edge.

3. The quick-change attachment structure according to claim 1, characterized in that: The elastic cylindrical pin (21) is interference-fitted into the hole of the rotating handle (40) and is limited to the corresponding hole of the oblique cylinder (30).

4. The quick-change attachment structure according to claim 1, characterized in that: The lower edge of the quick-change insert (13) is flush with the upper edge of the quick-change limiting plate (15) of the attachment.

5. The quick-change attachment structure according to claim 1, characterized in that: The spring (20) is disposed between the obliquely cut cylinder (30) and the mounting bracket (10).

6. The quick-change attachment structure according to claim 1, characterized in that: The shape of the oblique insert (11) is adapted to the shape of the lower edge of the bucket oblique plate of the attachment, and is fitted together by the oblique surface.

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