A narrow space multi-material pushing system based on linkage angle adjustment and double curvature bucket

Abstract

The present application relates to material shoveling technical field, especially in a kind of narrow space multi-material propelling system based on linkage angle adjustment and double curvature bucket, comprising: frame, bucket, wheel group and linkage adjusting mechanism, the frame is integrated door type structure, and the frame front end is symmetrically installed with turnover support, the bucket is connected with turnover support by pin shaft, the wheel group is installed in the frame lower end, and the linkage adjusting mechanism is installed in the frame upper end rear side, and the linkage adjusting mechanism is connected with the upper end rear side of bucket, and the linkage adjusting mechanism can drive bucket to switch between push mode and transfer mode;The present application is switched between low position hole and high position hole by the cooperation of push rod, locking unit and arc locking frame, and operator only needs to pull up and swing push rod, so that lock pin can be quickly switched between low position hole and high position hole, realize the conversion of bucket between "push mode" and "transfer mode", and the continuous operation efficiency is greatly improved.

Description

Technical Field

[0001] This application relates to the field of material handling technology, and in particular to a multi-material propulsion system in a confined space based on linkage angle adjustment and a double curvature bucket. Background Technology

[0002] In fields such as municipal sanitation, livestock breeding, port logistics and snow removal, it is often necessary to deal with the pushing, collection and transfer of various materials, such as snow pushing, snow transport, de-icing, manure removal, pushing wet materials and scraping water. Currently, the equipment used for the above operations is usually a bucket-type pushing device or a scraper-type conveyor.

[0003] In existing technologies, common bucket-type operating equipment mainly suffers from the following shortcomings: 1. The bucket has a simple structure and poor adaptability to multiple functions. Most existing buckets have a single curvature or flat plate structure. When facing different materials (such as wet snow, ice, sticky feces or sewage), the single curvature bucket has problems such as high pushing resistance, easy material overflow from the sides or front, and insufficient material accumulation in the bucket. It is difficult to simultaneously meet the two requirements of low resistance cutting and material guiding and rolling, resulting in low operating efficiency.

[0004] 2. Inconvenient switching between work modes, unable to handle both pushing and transshipment simultaneously. Many existing devices only have a single pushing function, meaning they can only push materials forward and cannot effectively transfer materials in the bucket to other places for unloading. For some adjustable buckets, the angle adjustment usually requires the use of tools to disassemble and install pins or bolts, which is cumbersome, time-consuming, and cannot achieve precise gear locking. Operators have difficulty quickly and reliably switching the working posture of the bucket at different operation stages (such as pushing first and then transferring), which seriously affects the efficiency of continuous operation.

[0005] To address the aforementioned problems, this invention proposes a multi-material propulsion system for confined spaces based on linkage angle adjustment and a double-curvature bucket. This system can meet the requirements of efficient multi-material pushing, rapid attitude switching, high rigidity and long service life, and corrosion resistance and anti-adhesion, thus solving the problems of poor adaptability and inability to simultaneously handle pushing and transporting in existing technologies. Summary of the Invention

[0006] To address the problems existing in the background art, this invention proposes a multi-material propulsion system for confined spaces based on linkage angle adjustment and a double curvature bucket.

[0007] The technical solution provided in this application for a multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket is as follows: A multi-material propulsion system for confined spaces based on linkage angle adjustment and a double-curvature bucket includes: a frame, a bucket, a wheel set, and a linkage adjustment mechanism. The frame is an integrated portal frame structure with symmetrical tilting supports mounted on the front end. The bucket is connected to the tilting supports via pins. The wheel set is mounted on the lower end of the frame, and the linkage adjustment mechanism is mounted on the rear side of the upper end of the frame. The linkage adjustment mechanism is connected to the upper rear side of the bucket, and can drive the bucket to switch between pushing mode and transfer mode.

[0008] Furthermore, the bucket has a double-curvature composite surface structure, with the lower part of the bucket being the first curved surface region and the upper part of the bucket being the second curved surface region, wherein the curvature of the second curved surface is greater than that of the first curved surface, that is, the radius of curvature of the second curved surface is smaller than that of the first curved surface.

[0009] Furthermore, the bucket is provided with arc-shaped closed sides on both sides to prevent material spillage.

[0010] Furthermore, the bottom of the bucket is provided with an installation interface for installing rubber scrapers or ice scraper blades.

[0011] Furthermore, the surface of the bucket is treated with anti-corrosion powder coating, the inner wall of the bucket is equipped with reinforcing ribs, and the inner wall of the bucket can be fitted with an anti-stick liner.

[0012] Furthermore, the wheel track of the wheel assembly is consistent with the width of the bucket.

[0013] Furthermore, the linkage adjustment mechanism includes a fixed frame, a push rod, a rotating support, a locking unit, a locking frame, and a connecting rod. The fixed frame is installed on the upper end of the frame, and a rearwardly inclined push rod is installed inside the fixed frame. The push rod is rotatably connected to the fixed frame through the rotating support. The push rod has a T-shaped structure, and the lower end of the push rod is a hollow structure. A locking unit is installed inside the lower end of the push rod, and a locking frame is installed inside the fixed frame. The locking unit and the locking frame are locked together. A connecting rod is installed between the lower end of the push rod and the bucket through a pin.

[0014] Furthermore, the locking frame is an arc-shaped structure coaxial with the rotating support. Multiple positioning holes are distributed along the arc on the locking frame. The multiple positioning holes include a low-position hole for locking the pushing mode and a high-position hole for locking the transfer mode. Limiting blocks are provided at both ends of the locking frame. When the locking unit is engaged with the low-position hole, the bucket is in the pushing mode; when the locking unit is engaged with the high-position hole, the bucket is in the transfer mode.

[0015] Furthermore, the locking unit includes a paddle, a connecting rod, a connecting seat, a spring, and a locking pin. The connecting rod is slidably arranged inside the push rod, and a connecting seat is installed at the upper end of the connecting rod. A sliding groove is opened on the push rod, and a paddle is installed on the outer side of the push rod. A pin is installed between the paddle and the connecting seat through the sliding groove. A spring is installed at the upper end of the connecting seat, and a locking pin is installed at the lower end of the connecting rod.

[0016] Furthermore, the locking pin has a bullet-shaped structure with a tapered guide surface at the front end, and the locking pin is inserted into the high-position locking hole and the low-position locking hole.

[0017] Beneficial effects Compared with the prior art, the present invention provides a multi-material propulsion system in a confined space based on linkage angle adjustment and double curvature bucket, which has the following beneficial effects: 1. In this invention, the bucket adopts a double-curvature composite curved surface structure. The lower first curved surface area has a smaller curvature, which makes it easier to cut into the material and reduces the cutting resistance. The upper second curved surface area has a larger curvature, which can guide the material to roll or flip naturally backward and upward along the curved surface, effectively preventing the material from accumulating at the front end of the bucket and reducing the overall pushing resistance.

[0018] 2. In this invention, through the cooperation of the push rod, locking unit and arc-shaped locking frame, the operator only needs to move the lever and swing the push rod back and forth to quickly switch the locking pin between the low hole and the high hole, realizing the conversion of the bucket between "pushing mode" and "transfer mode", which greatly improves the efficiency of continuous operation; at the same time, the locking pin adopts a bullet head structure, and even if the locking hole is not completely aligned, the conical head can guide the locking pin to slide into the locking hole automatically; the spring provides a continuous locking force to prevent the locking pin from falling out due to operation vibration. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a three-dimensional structural diagram of this application.

[0021] Figure 2 This is a cross-sectional structural diagram of this application.

[0022] Figure 3 This is a cross-sectional structural diagram of the frame and bucket in this application.

[0023] Figure 4 This is a cross-sectional structural diagram of the frame and linkage adjustment mechanism of this application.

[0024] Figure 5 This is a cross-sectional structural diagram of the push rod and locking unit in this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Tilting support; 2. Bucket; 21. Arc-shaped closed side; 22. Mounting interface; 3. Wheel set; 4. Linkage adjustment mechanism; 41. Fixed frame; 42. Push rod; 43. Rotating support; 44. Locking unit; 441. Paddle; 442. Connecting rod; 443. Connecting seat; 444. Spring; 445. Locking pin; 45. Locking bracket; 46. Connecting rod. Detailed Implementation

[0026] 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.

[0027] See Figures 1-5 As shown, this embodiment provides a multi-material propulsion system for confined spaces based on linkage angle adjustment and double curvature bucket, which mainly includes a frame 1, a bucket 2, a wheel set 3, and a linkage adjustment mechanism 4.

[0028] The frame 1 adopts an integrated portal frame structure, forming a closed load-bearing frame without welding seams, which significantly improves the overall rigidity and service life, and can withstand complex loads during pushing and transferring. Symmetrical tilting supports 11 are installed on the left and right sides of the front end of the frame 1. The lower rear end of the bucket 2 is rotatably connected to the tilting supports 11 via a pin, allowing the bucket 2 to adjust its pitch angle around the pin axis. A wheel set 3 is installed at the lower end of the frame 1 to support and move the entire system. The linkage adjustment mechanism 4 is installed on the upper rear side of the frame 1, connected to the upper rear side of the bucket 2. The linkage adjustment mechanism 4 drives the bucket 2 to swing around the tilting supports 11, allowing the bucket 2 to switch between "pushing mode" and "transfer mode" during operation to adapt to different materials and operational stages.

[0029] like Figures 2-3 As shown, the bucket 2 has a double-curvature composite curved surface structure. Specifically, the lower part of the bucket 2 (i.e., the area near the bottom) is the first curved surface area, which has a smaller curvature and is relatively gentle. Its main function is to cut into materials (such as snow, manure, ice, etc.) and reduce cutting resistance. The upper part of the bucket 2 is the second curved surface area, which has a greater curvature than the first curved surface area. That is, the upper part is more curved. This large curvature design can guide the material entering the bucket to roll or flip naturally backward and upward along the curved surface, effectively reducing the accumulation resistance and pushing resistance of the material at the front end of the bucket, making it easier to fill the bucket or throw it backward.

[0030] To prevent materials from overflowing from both sides of the bucket during pushing or transferring, the left and right sides of the bucket 2 are provided with arc-shaped closed side edges 21, which smoothly transition with the main body of the bucket to form a semi-closed containment space.

[0031] Considering that this system is applicable to a variety of harsh working conditions, such as de-icing or cleaning livestock farm floors, the bottom of the bucket 2 is provided with a standardized installation interface 22. This installation interface 22 can be quickly installed with rubber scrapers (suitable for cleaning wet materials or scraping water) or ice scraper blades (suitable for de-icing operations) according to actual operational needs. In addition, in view of the corrosive environment of ammonia in livestock farms, the surface of the bucket 2 is treated with anti-corrosion powder coating. At the same time, the inner wall of the bucket 2 is equipped with reinforcing ribs to improve strength, and can be further equipped with an anti-stick liner (such as a high molecular weight polyethylene board) to prevent wet manure or sticky materials from adhering to the inner wall of the bucket.

[0032] This system can perform multiple functions, including snow pushing, snow transport, ice removal, manure removal, wet material pushing, and water scraping.

[0033] To ensure good maneuverability and maneuverability in narrow passages (such as livestock farm aisles) and to prevent uneven loading when pushing materials, the left and right wheel track of the wheel set 3 is consistent with or smaller than the lateral width of the bucket 2. That is, the width between the outer sides of the two wheels matches the width of the bucket, ensuring that the material resistance can be evenly transmitted to the frame and wheel set when the bucket is pushing, thereby improving operational stability.

[0034] like Figures 4-5 As shown, the linkage adjustment mechanism 4 includes a fixed frame 41, a push rod 42, a rotating support 43, a locking unit 44, a locking frame 45, and a connecting rod 46.

[0035] The fixed frame 41 is fixedly installed on the upper rear side of the frame 1. Inside the fixed frame 41, there is a push rod 42 that is arranged backward. The push rod 42 is rotatably connected to the fixed frame 41 through a rotating support 43, so that the push rod 42 can swing back and forth around the rotating support 43. The push rod 42 has a T-shaped structure. Its upper horizontal bar is easy for the operator to hold and apply force. The lower section of the push rod 42 is a hollow structure. The locking unit 44 is installed at the lower end inside. The locking frame 45 is installed inside the fixed frame 41 at the position corresponding to the locking unit 44. The locking unit 44 and the locking frame 45 cooperate with each other to lock the swing position of the push rod 42. The lower end of the push rod 42 is also connected to a connecting rod 46 through a pin. The other end of the connecting rod 46 is connected to the upper rear side of the bucket 2 through a pin.

[0036] The locking frame 45 is an arc-shaped structure coaxial with the rotating support 43. Multiple positioning holes are distributed along the arc on the locking frame 45. The multiple positioning holes include a low-position hole for locking the pushing mode and a high-position hole for locking the transfer mode. Limiting blocks are provided at both ends of the locking frame 45. When the locking unit 44 is engaged with the low-position hole, the bucket 2 is in the pushing mode; when the locking unit 44 is engaged with the high-position hole, the bucket 2 is in the transfer mode. Limiting blocks are also provided at both ends of the locking frame 45 to limit the swing range of the lower end of the push rod 42 within the locking frame 45.

[0037] The locking unit 44 specifically includes a paddle 441, a connecting rod 442, a connecting seat 443, a spring 444, and a locking pin 445. The connecting rod 442 is slidably disposed inside the hollow interior of the push rod 42. The connecting seat 443 is fixedly installed at the upper end of the connecting rod 442. A vertical groove is provided on the side wall of the push rod 42. The paddle 441 is located outside the push rod 42 and is fixedly connected to the connecting seat 443 inside the groove by a pin, so that the paddle 441 can drive the connecting rod 442 to slide up and down. The spring 444 is installed at the upper end of the connecting seat 443. The spring is in a compressed state and always applies a downward elastic force to the connecting rod 442. The locking pin 445 is fixedly installed at the lower end of the connecting rod 442.

[0038] The locking pin 445 has a bullet-shaped structure with a tapered guide surface at the front end. The locking pin 445 is inserted into the high-position lock hole and the low-position lock hole so that it can automatically slide into the lock hole through the inclined surface when it is not fully aligned with the lock hole, so as to achieve blind operation and rapid positioning.

[0039] When switching to "pushing mode", the operator moves the lever 441 upward to overcome the force of the spring 444 and disengage the locking pin 445 from the current locking hole (high position hole). Then, the operator pushes the upper end of the push rod 42 backward, causing the push rod 42 to swing forward around the rotating support 43. When the lower end of the push rod 42 (i.e., the locking pin 445) slides to the low position hole, the lever 441 is released. Under the action of the spring 444, the locking pin 445 automatically inserts into the low position hole and locks in place. At this time, through the transmission of the connecting rod 46, the upper rear end of the bucket 2 is pulled forward, causing the bucket 2 to rotate forward around the tilting support 11. The bucket opening is pressed down and the bottom tilts forward, entering "pushing mode", which is suitable for reducing material overflow from the front when pushing materials (such as snowplowing or manure cleaning).

[0040] When switching to "transfer mode", move the lever 441 upward again to disengage the locking pin 445 from the low position hole. Then push the upper end of the push rod 42 forward to make the push rod 42 swing backward. When the locking pin 445 slides to the high position hole, release the lever 441. The locking pin 445 is inserted into the high position hole under the action of the spring 444. At this time, the connecting rod 46 pushes the upper rear side of the bucket 2, and the bucket 2 flips backward around the tilting support 11. The bucket opening is raised upward and the bottom tilts backward, entering "transfer mode", which is suitable for transferring the material collected in the bucket forward.

[0041] The limit block prevents the push rod 42 from swinging beyond the range of the low and high holes, avoiding damage to the mechanism due to misoperation. Through the above-mentioned linkage adjustment mechanism, the operator can quickly and reliably switch the bucket working mode without the aid of tools.

[0042] The working process of this application is described in detail below: S1: Initial Equipment Preparation and Mode Selection The operator first determines the required working mode based on the type of material to be processed and the operational needs. If pushing operations are required (such as snowplowing, manure removal, water scraping, pushing wet materials, etc.), the "pushing mode" is selected; if the material already collected in the bucket needs to be transferred or dumped (such as centralized unloading after snow transport, or transfer after manure removal, etc.), the "transfer mode" is selected. After confirming the mode, the operator holds the T-shaped crossbar at the upper end of the push rod 42, ready to perform the mode switching operation.

[0043] S2: Linkage adjustment mechanism unlocking and push rod swing The operator moves the lever 441 located on the side of the push rod 42 upwards. The lever 441 drives the connecting seat 443 and the connecting rod 442 to slide upwards against the elastic force of the spring 444 through the pin. This causes the locking pin 445 at the lower end of the connecting rod 442 to completely disengage from the current locking hole (low position hole or high position hole) on the locking frame 45. At this time, the linkage adjustment mechanism 4 is in the unlocked state. Subsequently, the operator pushes the upper end of the push rod 42 forward or backward according to the target mode, causing the push rod 42 to swing around the rotating support 43. The lower end of the push rod 42 drives the locking pin 445 to slide along the arc-shaped locking frame 45. At the same time, the lower end of the push rod 42 is connected to the upper rear side of the bucket 2 through the connecting rod 46, thereby starting to change the pitch angle of the bucket 2.

[0044] S3: Bucket Working Mode Switching and Locking If switching to the pushing mode: The operator pulls the upper end of the push rod 42 backward, causing the push rod 42 to swing forward. When the locking pin 445 slides along the locking frame 45 to the low position hole, the locking pin 445 automatically engages in the low position hole under the elastic force of the spring 444, making a "click" locking sound. At the same time, the limit block prevents the push rod 42 from swinging forward. At this time, the angle between the push rod 42 and the connecting rod 46 increases, the bucket mouth is pressed down and the bottom tilts forward, and the bucket 2 enters the pushing mode. In this mode, the lower first curved surface area of ​​the double curvature bucket 2 contacts the material, cutting into the material with a small curvature to reduce resistance. The upper second curved surface area guides the material to roll backward and upward, preventing the material from overflowing from the front. It is suitable for pushing operations.

[0045] If switching to transfer mode: The operator pushes the upper end of push rod 42 forward, causing push rod 42 to swing backward. When locking pin 445 slides along locking frame 45 to the high position hole, locking pin 445 automatically engages and locks under the action of spring 444. At this time, the angle between push rod 42 and connecting rod 46 decreases, the bucket opening lifts upward and the bottom tilts backward, and bucket 2 enters transfer mode. In this mode, the forward tilt angle of bucket 2 is conducive to transferring the material in the bucket forward, and the movement of wheel set 3 is used to achieve rapid transfer.

[0046] S4: Material pushing or transfer operation execution During pushing operations: The system is in pushing mode. The operator pushes the frame 1, and the wheel set 3 drives the whole unit forward. The rubber scraper or ice scraper blade installed at the bottom of the bucket 2 (pre-assembled through the installation interface 22 according to the material type) contacts the ground, shoveling the material (snow, manure, wet materials, water, etc.) into the bucket 2. The double-curvature composite surface effectively reduces pushing resistance, and the arc-shaped closed side 21 prevents material from overflowing from both sides. For the ammonia environment of the livestock farm, the anti-corrosion powder coating and anti-stick lining of the bucket 2 can reduce corrosion and material adhesion.

[0047] During transfer operations: After a certain amount of material is collected in bucket 2, the operator switches the system to transfer mode according to steps S2 and S3. At this time, bucket 2 is raised to prevent material from falling during transfer.

[0048] S5: Mode Reset After the operation is completed, the operator can switch the bucket 2 back to the pushing mode or the initial position state through the linkage adjustment mechanism 4 to facilitate the storage or transportation of the equipment.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket, characterized in that, include: The vehicle consists of a frame (1), a bucket (2), a wheel set (3), and a linkage adjustment mechanism (4). The frame (1) is an integrated portal frame structure. A tilting support (11) is symmetrically installed at the front end of the frame (1). The bucket (2) is connected to the tilting support (11) via a pin. A wheel set (3) is installed at the lower end of the frame (1). A linkage adjustment mechanism (4) is installed at the rear side of the upper end of the frame (1). The linkage adjustment mechanism (4) is connected to the upper rear side of the bucket (2). The linkage adjustment mechanism (4) can drive the bucket (2) to switch between pushing mode and transfer mode.

2. The multi-material propulsion system in a confined space based on linkage angle adjustment and double curvature bucket according to claim 1, characterized in that: The bucket (2) is a double-curvature composite surface structure. The lower part of the bucket (2) is the first surface region, and the upper part of the bucket (2) is the second surface region. The curvature of the second surface is greater than that of the first surface, that is, the radius of curvature of the second surface is smaller than that of the first surface.

3. The multi-material propulsion system in a confined space based on linkage angle adjustment and double curvature bucket according to claim 2, characterized in that: The bucket (2) is provided with arc-shaped closed sides (21) on both sides to prevent material spillage.

4. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 3, characterized in that: The bottom of the bucket (2) is provided with an installation interface (22) for installing rubber scrapers or ice scraper blades.

5. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 4, characterized in that: The surface of the bucket (2) is treated with anti-corrosion powder coating, and the inner wall of the bucket (2) is equipped with reinforcing ribs. The inner wall of the bucket (2) can be fitted with an anti-stick liner.

6. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 5, characterized in that: The wheel track of the wheel assembly (3) is consistent with the width of the bucket (2).

7. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 1, characterized in that: The linkage adjustment mechanism (4) includes a fixed frame (41), a push rod (42), a rotating support (43), a locking unit (44), a locking frame (45), and a connecting rod (46). The fixed frame (41) is installed on the upper end of the frame (1). The push rod (42) is inclined backward inside the fixed frame (41). The push rod (42) is rotatably connected to the fixed frame (41) through the rotating support (43). The push rod (42) has a T-shaped structure. The lower end of the push rod (42) is hollow. The locking unit (44) is installed inside the lower end of the push rod (42). The locking frame (45) is installed inside the fixed frame (41). The locking unit (44) and the locking frame (45) are locked together. The lower end of the push rod (42) is connected to the bucket (2) through a pin and a connecting rod (46).

8. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 7, characterized in that: The locking frame (45) is an arc-shaped structure coaxial with the rotating support (43). Multiple positioning holes are distributed along the arc on the locking frame (45). The multiple positioning holes include a low-position hole for locking the pushing mode and a high-position hole for locking the transfer mode. Limiting blocks are provided at both ends of the locking frame (45). When the locking unit (44) is engaged with the low-position hole, the bucket (2) is in the pushing mode; when the locking unit (44) is engaged with the high-position hole, the bucket (2) is in the transfer mode.

9. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 8, characterized in that: The locking unit (44) includes a paddle (441), a connecting rod (442), a connecting seat (443), a spring (444), and a locking pin (445). The connecting rod (442) is slidably arranged inside the push rod (42). The connecting seat (443) is installed on the upper end of the connecting rod (442). A sliding groove is opened on the push rod (42). The paddle (441) is installed on the outer side of the push rod (42). A pin is installed between the paddle (441) and the connecting seat (443) through the sliding groove. The spring (444) is installed on the upper end of the connecting seat (443). The locking pin (445) is installed on the lower end of the connecting rod (442).

10. A multi-material propulsion system in a confined space based on linkage angle adjustment and a double-curvature bucket according to claim 9, characterized in that: The locking pin (445) has a bullet-shaped structure with a tapered guide surface at the front end, and the locking pin (445) is inserted into the high-position locking hole and the low-position locking hole.

Images