Shifting machine

Abstract

The utility model discloses a shifting machine, belongs to the field of shifting machines, solves the problem that a first coupler and a second coupler are accidentally separated in the using process of the shifting machine, and adopts the technical scheme that the shifting machine mainly comprises a main machine and a suspension arm, the main machine is provided with a bearing part, and the suspension arm is connected to the bearing part through a coupling device. The coupling device comprises a first coupler installed on the bearing component and a second coupler installed on the suspension arm, the first coupler is provided with a lock hole, the second coupler is provided with a coupling groove and a lock pin, the first coupler and the coupling groove are connected in an inserted mode in the first direction, and the lock pin penetrates through the lock hole in the second direction intersecting with the first direction to lock the first coupler. The lock pin is in concave-convex fit with the first coupler by means of the gravity of the suspension arm so as to be locked, so that the first coupler and the second coupler are interlocked. The coupler is mainly used for limiting the first coupler and the second coupler from being freely separated when the suspension arm loads weight.

Description

Technical Field

[0001] This utility model demonstrates a transfer machine, belonging to the technical field of transfer machine technology. Background Technology

[0002] Mobility transfer machines are primarily used to address mobility, toileting, and bathing issues for the elderly, those with mobility impairments, and those unable to walk. They are widely applicable in hospitals, nursing homes, rehabilitation centers, and homes. Mobility transfer machines are mainly nursing devices that assist disabled individuals with barrier-free movement, used for short-distance relocation and rehabilitation care for disabled individuals or patients.

[0003] A typical patient transfer system includes a track, a trolley that slides along the track, a main unit suspended from the trolley, and a boom driven by the main unit for lifting and lowering. The main unit contains a winch with a load-bearing component wound on it. This load-bearing component is connected to the boom. A motor within the main unit drives the winch to rotate, controlling the release and retraction of the load-bearing component, thus lowering and raising the boom. To facilitate boom replacement, existing technologies use a detachable first and second coupler to connect the boom to the load-bearing component. However, in actual use, the engagement of the second and first couplers is easily unlocked due to accidental operation, especially during the transfer of disabled individuals. Accidental detachment of the second and first couplers could lead to falls and further injury to the disabled person, posing a significant safety hazard. Existing technologies also include self-locking structures to prevent the second and first couplers from detaching unnecessarily. However, adding a self-locking structure complicates the connection and disassembly of the boom and load-bearing component, and there is a risk that the second and first couplers may not be fully locked after installation, rendering the self-locking structure ineffective. Utility Model Content

[0004] The purpose of this invention is to solve the problem of accidental disengagement between the first coupler and the second coupler during the use of the shifting machine. To this end, a shifting machine is provided in which the first coupler and the second coupler form a self-locking mechanism and will not disengage when the boom is under load.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A transfer machine includes a main unit and a boom. The main unit has a supporting component, and the boom is connected to the supporting component via a coupling device. The coupling device includes a first coupler installed on the supporting component and a second coupler installed on the boom. The first coupler has a locking hole, and the second coupler has a coupling groove and a locking pin. The first coupler and the coupling groove are inserted into each other in a first direction. The locking pin passes through the locking hole in a second direction intersecting the first direction to lock the first coupler. The locking pin is locked by forming a concave-convex fit with the first coupler under the weight of the boom, so that the first coupler and the second coupler are interlocked.

[0007] The beneficial effects of using this utility model are:

[0008] In this invention, the first coupler has a locking hole, and the second coupler has a limiting groove and a locking pin. The locking pin passes through the locking hole along a second direction to prevent the first coupler from disengaging from the coupling groove, thus completing the connection between the first coupler and the second coupler and realizing the connection between the boom and the transfer machine. After the locking pin passes through the locking hole, under the action of the boom's own weight, the locking pin and the first coupler form a concave-convex fit, realizing the mutual locking of the first coupler and the second coupler. When the first coupler and the second coupler are to be unlocked, the locking pin needs to be raised to separate the concave-convex fit between the locking pin and the first coupler, thereby releasing the lock pin and the first coupler. The coupler's locking in the second direction allows the locking pin to move in the second direction to disengage from the lock hole and engage with the locking pin and the first coupler in the first direction. Therefore, when unlocking the locking pin and the first coupler from the locked state, the locking pin must first be lifted to separate the convex and concave fit between the first coupler and the locking pin. The locking pin cannot be allowed to slide directly from the locked state to the unlocked position. This achieves automatic locking between the locking pin and the first coupler, reducing the possibility of the locking pin disengaging from the first coupler due to accidental factors. This ensures the stability of the connection between the boom and the load-bearing components, guaranteeing the safety of the shifting machine during use, especially... When the boom is in the transport state, it bears a significant weight, resulting in a substantial downward pull. Unlocking the locking pin under these conditions requires overcoming the boom's weight and load, raising the boom relative to the first coupler until the locking pin and the coupler's interlocking mechanism separates. This requires considerable external force, effectively preventing accidental unlocking and ensuring the boom's safety under load. Furthermore, the interlocking mechanism between the locking pin and the first coupler in the direction of gravity enables self-locking. The overall structure and operation are relatively simple. Furthermore, the locking pin self-locks with the first coupler under the action of gravity, requiring no manual operation. Therefore, there is no possibility of the locking pin and the first coupler not locking due to forgetfulness, ensuring that the self-locking of the locking pin and the first coupler can take effect automatically, making locking the locking pin and the first coupler more convenient and worry-free. Secondly, when the boom needs to be disassembled, the load on the boom has already been removed. The user only needs to overcome the weight of the boom itself to raise the boom relative to the first coupler, making unlocking the locking pin and the first coupler easier and less strenuous, which helps to simplify the unlocking process of the locking pin and the first coupler.

[0009] Preferably, the bottom of the locking pin has a downward-opening limiting groove. The first coupler, in the locked state, is embedded in the limiting groove to prevent it from disengaging from the lock hole in the second direction. The locking pin rises relative to the first coupler, causing the first coupler to disengage from the limiting groove and release the convex-concave fit. By using the aforementioned technical solution, by providing a limiting groove on the locking pin to allow the first coupler to extend and form a convex-concave fit, the integrity of the overall structure of the first coupler can be maintained, ensuring good strength and helping to increase the maximum load of the first coupler.

[0010] Preferably, the locking pin includes a locking portion, a limiting groove is disposed at the bottom of the locking portion, and the locking member is elastically loaded by the reset member, giving the locking portion a tendency to extend into the lock hole. The bottom wall of the lock hole extends into the limiting groove to restrict the locking pin from sliding in the second direction. Using the aforementioned technical solution, the locking pin extends into the lock hole, forming a lock in the first direction with the first coupler. The bottom wall of the lock hole extends into the limiting groove and engages with it, forming a lock in the second direction with the first coupler. Therefore, the locking pin and the first coupler form restrictions in two directions, and the first and second directions intersect each other, effectively improving the connection stability between the locking pin and the first coupler and preventing the locking pin from accidentally disengaging from the first coupler due to vibration, impact, or misoperation. Furthermore, the reset member allows the locking pin to automatically slide towards the locking position, making the locking of the locking pin with the first coupler simpler and more convenient.

[0011] Preferably, the bottom wall of the lock hole is provided with a downward-through clearance notch, and the lock pin also includes an unlocking part, the width of which is smaller than the width of the clearance notch. The unlocking part enters the lock hole through the clearance notch, and the width of the locking part is larger than the width of the clearance notch. Using the aforementioned technical solution, when the unlocking part of the lock pin is aligned with the clearance notch, the up-and-down movement of the first coupler allows the unlocking part to enter or disengage from the lock hole along the clearance notch. When the lock pin is in the locked state, the clearance notch is aligned with the locking part. Since the width of the locking part is larger than the clearance notch, the locking part cannot disengage from the lock hole through the clearance notch, making the lock pin and the first coupler more secure and reliable. Furthermore, adding an unlocking part to the lock pin can improve the strength of the locking part, enhance its load-bearing capacity in the vertical direction, reduce the possibility of deformation or breakage of the locking part, and allow the boom to lift heavier loads, thereby improving the safety of the shifting machine.

[0012] Preferably, the locking part has a positioning groove at the end away from the unlocking part. One end of the reset member abuts against the inner wall of the second coupler, and the other end extends into the positioning groove. The locking pin slides in the unlocking direction to compress the reset member. Using the aforementioned technical solution, the positioning groove provides precise installation guidance for the reset member, ensuring that the axis of the reset member is consistent with the sliding direction of the locking pin. This avoids lateral force caused by the offset of the reset member, which could lead to jamming or even complete blockage of the locking pin. Positioning the reset member makes the sliding of the locking pin smoother and less strenuous.

[0013] Preferably, the locking part is provided with two guide ramps that guide the locking pin to slide in the unlocking direction, with the two guide ramps located on both sides of the unlocking part. Using the aforementioned technical solution, during the installation of the locking pin and the first coupler, the first coupler acts on the guide ramps, automatically pushing the locking pin to the unlocking position. Therefore, during installation, the user can lock the locking pin and the first coupler without operating the locking pin, further reducing the difficulty of operation.

[0014] Preferably, the bottom wall of the lock hole is provided with a downwardly recessed groove, and the bottom of the lock pin is provided with a positioning protrusion. When the lock pin is engaged with the first coupler, the positioning protrusion and the groove form a concave-convex fit.

[0015] Preferably, the second coupler further includes a movable seat, a locking pin slidably mounted on the movable seat, and a gap area between one end of the locking pin and the movable seat for the first coupler to be inserted.

[0016] Preferably, the height of the keyhole is greater than the height of the locking pin, the top of the locking pin abuts against the top wall of the keyhole, and the locking pin separates from the concave-convex fit of the first coupler to release the mutual locking. By adopting the aforementioned technical solution, it can be ensured that the locking pin has sufficient lifting distance within the keyhole to allow the concave-convex fit structure of the locking pin and the first coupler to separate, thereby completing the mutual unlocking of the locking pin and the first coupler.

[0017] Preferably, the second coupler further includes a movable seat rotatably connected to the boom, with a locking pin disposed within the movable seat. Using the aforementioned technical solution, the movable seat and the boom can rotate relative to each other. Therefore, during boom rotation, the second coupler will not be forcibly rotated, effectively preventing the load-bearing components from twisting due to boom rotation. The movable seat effectively reduces the possibility of damage to the load-bearing components due to twisting, thus effectively extending the service life of the load-bearing components.

[0018] Preferably, the boom is provided with a connecting seat, which has a through hole and a fastener. The fastener passes through the through hole and is fixedly connected to the movable seat. The fastener and the through hole are rotatably engaged to realize the rotatable connection between the movable seat and the connecting seat.

[0019] Preferably, the bottom of the connecting seat is provided with a mounting groove, and a bearing is installed in the mounting groove. Fasteners pass through the bearing and through the through hole in sequence and are fixedly connected to the movable seat. The outer ring of the bearing is interference-fitted with the inner wall of the mounting groove, and the inner ring of the bearing is interference-fitted with the outer periphery of the fastener. Using the aforementioned technical solution, the movable seat achieves relative rotation with the connecting seat through the cooperation of the bearing and the fastener, which makes the rotation of the movable seat more stable and reduces the possibility of wobbling. At the same time, the bearing also protects the fastener, reducing the possibility of damage caused by long-term friction between the fastener and the connecting seat.

[0020] Preferably, the locking pin is connected to an operating element, which can be operated to slide the locking pin in the unlocking direction.

[0021] Other features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of a shifting machine according to the present invention;

[0024] Figure 2 This is an exploded view of a shifting machine according to the present invention;

[0025] Figure 3 This is a cross-sectional view of a shifting machine according to the present invention. Figure 1 ;

[0026] Figure 4 This is a cross-sectional view of a shifting machine according to the present invention. Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the structure of the first coupler and locking pin in a shifting machine according to the present invention;

[0028] Figure 6 This is an exploded view of the first coupler and locking pin in a shifting machine according to the present invention;

[0029] Figure 7 This is a schematic diagram of the locking pin structure in a shifting machine according to the present invention.

[0030] Reference numerals: 1. Main unit; 11. Bearing component; 12. First coupler; 121. Lock hole; 1211. Bottom wall; 122. Clearance notch; 2. Boom; 21. Connecting seat; 211. Through hole; 212. Mounting groove; 22. Fastener; 23. Bearing; 3. Second coupler; 31. Movable seat; 311. Coupling groove; 32. Locking pin; 321. Locking part; 322. Unlocking part; 323. Limiting groove; 324. Positioning groove; 325. Guide slope; 33. Reset part; 34. Operating part; 41. First direction; 42. Second direction. Detailed Implementation

[0031] The technical solutions of the present utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present utility model.

[0032] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", 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 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 utility model.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] like Figures 1 to 7 As shown in the figure, this embodiment illustrates a transfer machine, including a main unit 1 and a boom 2. The main unit 1 is provided with a support component 11, and the boom 2 is connected to the support component 11 through a coupling device. The coupling device includes a first coupler 12 installed on the support component 11 and a second coupler 3 installed on the boom 2. The first coupler 12 has a locking hole 121, and the second coupler 3 has a coupling groove 311 and a locking pin 32. The first coupler 12 and the coupling groove 311 are inserted into each other in a first direction 41. The locking pin 32 passes through the locking hole 121 in a second direction 42 that intersects with the first direction 41 to lock the first coupler 12. The locking pin 32 is locked by forming a concave-convex fit with the first coupler 12 by the weight of the boom 2, so that the first coupler 12 and the second coupler 3 are interlocked.

[0035] In this embodiment, the first coupler 12 has a locking hole 121, and the second coupler 3 has a limiting groove 323 and a locking pin 32. The locking pin 32 passes through the locking hole 121 along the second direction 42 to restrict the first coupler 12 from disengaging from the coupling groove 311, thus completing the connection between the first coupler 12 and the second coupler 3 and realizing the connection between the boom 2 and the transfer machine. After the locking pin 32 passes through the locking hole 121, under the action of the boom 2's own weight, the locking pin 32 and the first coupler 12 form a concave-convex fit, realizing the mutual locking of the first coupler 12 and the second coupler 3. When the first coupler 12 and the second coupler 3 are unlocked, the locking pin 32 needs to be raised so that the concave-convex fit between the locking pin 32 and the first coupler 12 is closed. The locking pin 32 and the first coupler 12 are separated to release the locking of the locking pin 32 and the first coupler 12 in the second direction 42, allowing the locking pin 32 to move along the second direction 42 to disengage from the lock hole 121 and contact the locking pin 32 and the first coupler 12 in the first direction 41. Therefore, when the locking pin 32 and the first coupler 12 are unlocked from the locked state, the locking pin 32 must first be lifted to separate the convex and concave fit between the first coupler 12 and the locking pin 32. The locking pin 32 cannot be directly slid from the locked state to the unlocked position. This enables the automatic locking of the locking pin 32 and the first coupler 12, reducing the possibility of the locking pin 32 disengaging from the first coupler 12 due to accidental factors, thereby ensuring the stability of the connection between the boom 2 and the load-bearing component 11. This design ensures the safety of the transfer machine during use, especially when the boom 2 is in a transport state. The boom 2 bears a significant weight and experiences a large downward pull. Unlocking the locking pin 32 under these conditions requires overcoming the weight and load of the boom 2, raising it relative to the first coupler 12 until the locking pin 32 and the first coupler 12 separate. This requires a very large external force, thus effectively preventing accidental unlocking and ensuring the safe use of the boom 2 under load. Furthermore, the interlocking of the locking pin 32 and the first coupler 12 in the direction of gravity achieves self-locking between them. Its overall structure and operation... The process is relatively simple. Furthermore, the locking pin 32 self-locks with the first coupler 12 under gravity, requiring no manual operation. Therefore, there is no possibility of forgetting to lock the pin 32 and the first coupler 12, ensuring that the self-locking mechanism automatically activates, making locking the pin 32 and the first coupler 12 more convenient and worry-free. Secondly, when the boom 2 needs to be disassembled, the load on the boom 2 has already been removed. The user only needs to overcome the weight of the boom 2 itself to raise the boom 2 relative to the first coupler 12, making unlocking the pin 32 and the first coupler 12 easier and less strenuous, thus simplifying the unlocking process.

[0036] like Figure 1 and Figure 2In this embodiment, the transfer machine includes a main unit 1. A winch and a motor for driving the winch are rotatably installed inside the main unit 1. A bearing component 11 is wound around the winch. One end of the bearing component 11 extends from the bottom of the main unit 1 and hangs down naturally as a traction end. A first coupler 12 is installed at the traction end of the bearing component 11. A second coupler 3 is installed at the top of the middle part of the boom 2. The second coupler 3 includes a movable seat 31 and a locking pin 32 slidably disposed on the movable seat 31. The locking pin 32 extends along... The first coupler 12 slides horizontally within the movable seat 31. The top of the movable seat 31 is provided with a coupling groove 311 into which the first coupler 12 extends. The first coupler 12 is provided with a locking hole 121. After the first coupler 12 is inserted into the coupling groove 311 along the first direction 41, the locking pin 32 passes through the locking hole 121 along the second direction 42 and engages with the locking hole 121 to limit the first coupler 12 from disengaging from the movable seat 31, thereby locking the first coupler 12 and the second coupler 3 and completing the connection between the boom 2 and the bearing component 11.

[0037] It should be noted that, in this embodiment, the first direction 41 is parallel to the direction of gravity, the second direction 42 is parallel to the horizontal direction, and the unlocking direction of the locking pin 32 is parallel to the second direction 42.

[0038] like Figure 3 and Figure 5 As shown, in this embodiment, the locking pin 32 includes a locking part 321 and a limiting groove 323 disposed at the bottom of the locking part 321. The locking pin 32 is elastically loaded by the reset member 33, giving the locking part 321 a tendency to extend into the lock hole 121. When the locking pin 32 is locked with the first coupler 12, the locking part 321 penetrates the lock hole 121, and the bottom wall 1211 of the lock hole 121 is located below the limiting groove 323. Under the action of the weight of the boom 2 itself, the boom 2 will fall relative to the first coupler 12, so that the bottom wall 1211 of the lock hole 121 enters the limiting groove 323. The side wall of the limiting groove 323 abuts against the edge of the bottom wall 1211 of the lock hole 121, thereby restricting the locking pin 32 from sliding in the second direction 42, thus realizing... The locking pin 32 is now locked to the first coupler 12. The fastener extends into the lock hole 121, so that the locking pin 32 and the first coupler 12 form a vertical lock. The bottom wall 1211 of the lock hole 121 extends into the limiting groove 323 and engages with the limiting groove 323 to form a horizontal lock. Therefore, the locking pin 32 and the first coupler 12 form a two-way restriction, which effectively improves the connection stability between the locking pin 32 and the first coupler 12 and prevents the locking pin 32 from accidentally disengaging from the first coupler 12 due to vibration, impact or misoperation. In addition, the reset member 33 can make the locking pin 32 slide automatically to the locked position, making the locking of the locking pin 32 and the first coupler 12 simpler and more convenient.

[0039] like Figure 3 and Figure 4 As shown, in this embodiment, the height of the locking part 321 is less than the height of the lock hole 121, which ensures that the locking part 321 can be smoothly inserted into the lock hole 121. When the locking part 321 penetrates the lock hole 121, the locking part 321 can move relative to the first coupler 12 in the direction of gravity within the lock hole 121. In addition, when the top of the locking part 321 abuts against the top wall of the lock hole 121, the bottom wall 1211 of the lock hole 121 disengages from the limiting groove 323. That is, when the locking pin 32 and the first coupler 12 need to be unlocked, the locking pin 32 is moved upward relative to the first coupler 12 by raising the boom 2. When the locking part 321 abuts against the top wall of the lock hole 121, the bottom wall 1211 of the lock hole 121 disengages from the limiting groove 323. At this time, the locking pin 32 and the lock hole 121 are in horizontal contact and limited. The user can manually slide the locking pin 32 in the unlocking direction until the locking pin 32 and the first coupler 12 are unlocked.

[0040] like Figure 6 and Figure 7As shown, in this embodiment, the locking pin 32 further includes an unlocking part 322. An operating member 34 is connected to one end of the unlocking part 322 away from the locking part 321. The two ends of the resetting member 33 respectively abut against the end of the locking part 321 away from the unlocking part 322 and the inner wall of the movable seat 31. The bottom wall 1211 of the lock hole 121 has a downwardly penetrating clearance notch 122. The width of the clearance notch 122 is smaller than the width of the lock hole 121, and the clearance notch 122 is located in the middle of the bottom wall 1211 of the lock hole 121. The width of the unlocking part 322 is smaller than the width of the clearance notch 122. The locking part 322 enters the lock hole 121 through the clearance notch 122. The width of the locking part 321 is greater than the width of the clearance notch 122. When the locking pin 32 is not subjected to external force, the locking pin 32 is elastically loaded by the reset member 33. At this time, the locking part 321 is aligned with the socket of the movable seat 31. Because the width of the locking part 321 is large, the first coupler 12 cannot be directly and completely inserted into or disengaged from the coupling groove 311 through the locking part 321. When the first coupler 12 needs to be installed, the user can push the operating member 34 to move the locking pin 32 towards the unlocking side. Slide the mechanism to compress the reset member 33 until the unlocking part 322 aligns with the coupling groove 311 of the movable seat 31. At this point, insert the first coupler 12 into the coupling groove 311. Since the width of the unlocking part 322 is smaller than the width of the clearance notch 122, the unlocking part 322 can enter the lock hole 121 relative to the first coupler 12 along the clearance notch 122, thus completing the insertion of the first coupler 12. After the first coupler 12 is inserted into place, release the operating member 34. The locking pin 32 will automatically slide towards the locking position under the action of the reset member 33 until the locking part 32... 1. The locking part 321 penetrates the lock hole 121. At this time, the locking part 321 will form a vertical limit with the bottom wall 1211 of the lock hole 121 to restrict the first coupler 12 from disengaging from the coupling groove 311, thereby completing the locking of the first coupler 12 and the second coupler 3. In this embodiment, the locking pin 32 is equipped with an unlocking part 322, which can improve the strength of the locking part 321, enhance the load-bearing capacity of the locking part 321 in the vertical direction, reduce the possibility of deformation or breakage of the locking part 321, and enable the boom 2 to lift heavier loads, thereby improving the safety of the shifting machine.

[0041] To make the insertion of the first coupler 12 easier and more convenient, the locking part 321 in this embodiment is provided with two guide slopes 325 for guiding the locking pin 32 to slide towards the unlocking position. Before the first coupler 12 is inserted, the guide slopes 325 of the locking part 321 are aligned with the coupling groove 311. During the process of inserting the first coupler 12 into the coupling groove 311, the bottom end of the first coupler 12 first abuts against the guide slopes 325. As external force is continuously applied, the first coupler 12 pushes the locking pin 32 towards the unlocking position through the guide slopes 325. When the locking pin 32 is in the unlocked position, the unlocking part 322 of the locking pin 32 is aligned with the coupling groove 311, and the unlocking part 322 can enter the clearance notch 122 so that the first coupler 12 can be fully inserted into the coupling groove 311. During the insertion process of the first coupler 12, the user can automatically insert and lock the locking pin 32 and the first coupler 12 without manually operating the locking pin 32 through the guide slope 325. This can effectively simplify the connection between the first coupler 12 and the boom 2 and improve the installation efficiency of the boom 2.

[0042] In this embodiment, the unlocking part 322 and the locking part 321 are an integral structure. The unlocking part 322 and the locking part 321 have the same height. The height difference between the upper and lower ends of the guide slope 325 is the same as the height of the unlocking part 322. The locking part 321 is provided with two guide slopes 325, which are located on both sides of the unlocking part 322. The distance between the two guide slopes 325 is less than the width of the clearance notch 122. During the insertion of the first coupler 12, as the bottom end of the femoral head slides down along the guide slope 325, the unlocking part 322 simultaneously enters the clearance notch 122. When the first coupler 12 is inserted into the clearance notch 122 after disengaging from the guide slope 325, the unlocking part 322 and the clearance notch 122 can also form a limiting fit during the process of the first coupler 12 being guided into the guide slope 325. This avoids the possibility of the first coupler 12 shifting position or slipping, and ensures that the first coupler 12 can be inserted smoothly. In addition, the guide slope 325 is provided on both sides of the unlocking part 322, which can make the force on the locking part 321 more balanced, avoid the possibility of the locking part 321 deforming due to excessive local force, and help to improve the service life of the locking pin 32.

[0043] It is understandable that in other embodiments, the locking pin 32 may also form a gap area between itself and the movable seat 31 for the insertion of the first coupler 12. That is, there is a gap area between the end of the locking part 321 that is inserted into the lock hole 121 and the movable seat 31. When the user operates the locking pin 32 to slide to the unlock position, the locking part 321 avoids the coupling groove 311 of the movable seat 31, and the first coupler 12 can be fully inserted into the coupling groove 311. At this time, the first coupler 12 is in the gap area, and the lock hole 121 is in front of the locking part 321. When the user releases the operating member 34, the locking pin 32 will automatically slide to the locking position under the action of the reset member 33, so that the locking part 321 of the locking pin 32 passes through the lock hole 121, thereby realizing the locking of the locking pin 32 and the first coupler 12. In this embodiment, the operating member 34 may be used to pull the locking pin 32 to slide to the unlock position.

[0044] It is understandable that in other embodiments, the locking part 321 and the operating member 34 may also be provided with two connecting parts, with the interval area formed between the end of the locking part 321, the operating member 34 and the two connecting parts. In this embodiment, the user presses the operating member 34 to drive the locking pin 32 to slide to the unlock position.

[0045] like Figure 3 and Figure 7 As shown, in this embodiment, the locking part 321 is provided with a positioning groove 324 at the end away from the unlocking part 322. One end of the reset member 33 abuts against the inner wall of the movable buckle, and the other end extends into the positioning groove 324. The locking pin 32 slides in the unlocking direction to compress the reset member 33. The positioning groove 324 provides a precise installation guide for the reset member 33, ensuring that the axis of the reset member 33 is consistent with the sliding direction of the locking pin 32. This avoids the lateral force caused by the offset of the reset member 33, which could cause the sliding of the locking pin 32 to become stuck or even jammed. Positioning the reset member 33 can make the sliding of the locking pin 32 smoother and less strenuous.

[0046] like Figure 3 and Figure 4As shown, in this embodiment, a connecting seat 21 is fixedly installed inside the boom 2. The connecting seat 21 has a through hole 211 and a fastener 22. The bottom of the movable seat 31 has a threaded hole. The fastener 22 passes through the through hole 211 and is threadedly connected to the threaded hole of the movable seat 31. The fastener 22 and the through hole 211 are rotatably engaged to realize the rotatable connection between the movable seat 31 and the connecting seat 21. Since the boom 2 is prone to rotation during use, and the bearing component 11 is usually a flexible strip structure, when the bearing component 11 rotates with the boom 2, the bearing component 11 will twist, which can easily damage the bearing component 11. However, the movable seat 31 can rotate relative to the boom 2. Therefore, during the rotation of the boom 2, the second coupler 3 will not be forced to rotate, which can effectively prevent the bearing component 11 from twisting due to the rotation of the boom 2. The movable seat 31 can effectively reduce the possibility of the bearing component 11 being damaged by twisting, and can effectively extend the service life of the bearing component 11.

[0047] In this embodiment, the bottom of the connecting seat 21 is provided with a mounting groove 212, and a bearing 23 is provided in the mounting groove 212. The fastener 22 passes through the bearing 23 and the through hole 211 in sequence and is fixedly connected to the movable seat 31. The outer ring of the bearing 23 is interference-fitted with the inner wall of the mounting groove 212, and the inner ring of the bearing 23 is interference-fitted with the outer periphery of the fastener 22. The movable seat 31 achieves relative rotation with the connecting seat 21 through the cooperation of the bearing 23 and the fastener 22, which can make the rotation of the movable seat 31 more stable and reduce the possibility of the movable seat 31 shaking. At the same time, the bearing 23 can also protect the fastener 22 and reduce the possibility of damage to the fastener 22 due to long-term friction with the connecting seat 21.

[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A shifting machine, characterized in that, The system includes a main unit and a boom. The main unit has a load-bearing component, and the boom is connected to the load-bearing component via a coupling device. The coupling device includes a first coupler installed on the load-bearing component and a second coupler installed on the boom. The first coupler has a locking hole, and the second coupler has a coupling groove and a locking pin. The first coupler and the coupling groove are inserted into each other in a first direction. The locking pin passes through the locking hole in a second direction that intersects with the first direction to lock the first coupler. The locking pin is locked by forming a concave-convex fit with the first coupler by the weight of the boom, so that the first coupler and the second coupler are interlocked.

2. The shifting machine according to claim 1, characterized in that, The bottom of the locking pin is provided with a downward-opening limiting groove. The first coupler in the locked state is embedded in the limiting groove to prevent it from disengaging from the lock hole in the second direction. The locking pin is raised relative to the first coupler to disengage the first coupler from the limiting groove to release the concave-convex fit.

3. A shifting machine according to claim 2, characterized in that, The locking pin includes a locking part, a limiting groove is provided at the bottom of the locking part, and the locking pin is elastically loaded by the reset member so that the locking part has a tendency to extend into the lock hole. The bottom wall of the lock hole extends into the limiting groove to restrict the locking pin from sliding in the second direction.

4. A shifting machine according to claim 3, characterized in that, The bottom wall of the lock hole is provided with a downward through clearance notch, and the lock pin also includes an unlocking part. The width of the unlocking part is smaller than the width of the clearance notch. The unlocking part enters the lock hole through the clearance notch, and the width of the locking part is larger than the width of the clearance notch.

5. A shifting machine according to claim 4, characterized in that, The locking part has a positioning groove at the end away from the unlocking part. One end of the reset member abuts against the inner wall of the second coupler, and the other end extends into the positioning groove. The locking pin slides in the unlocking direction to compress the reset member.

6. A shifting machine according to claim 4, characterized in that, The locking part is provided with two guide slopes that guide the locking pin to slide in the unlocking direction, and the two guide slopes are located on both sides of the unlocking part.

7. A shifting machine according to claim 1, characterized in that, The bottom wall of the lock hole is provided with a downward recessed groove, and the bottom of the lock pin is provided with a positioning protrusion. When the lock pin is engaged with the first coupler, the positioning protrusion and the groove form a concave-convex fit in the direction of gravity.

8. A shifting machine according to claim 1, characterized in that, The second coupler also includes a movable seat, a locking pin slidably mounted on the movable seat, and a gap area between one end of the locking pin and the movable seat for the first coupler to be inserted.

9. A shifting machine according to claim 1, characterized in that, The height of the keyhole is greater than the height of the locking pin. The top of the locking pin abuts against the top wall of the keyhole. The locking pin and the first coupler separate to release their mutual locking.

10. A shifting machine according to claim 1, characterized in that, The second coupler also includes a movable seat that is rotatably connected to the boom, with a locking pin disposed within the movable seat.

11. A shifting machine according to claim 10, characterized in that, The boom is equipped with a connecting seat, which has a through hole and a fastener. The fastener passes through the through hole and is fixedly connected to the movable seat. The fastener and the through hole are rotatably engaged to realize the rotatable connection between the movable seat and the connecting seat.

12. A shifting machine according to claim 11, characterized in that, The bottom of the connecting seat is provided with a mounting groove, and a bearing is provided in the mounting groove. Fasteners pass through the bearing and through hole in sequence and are fixedly connected to the movable seat. The outer ring of the bearing is interference-fitted with the inner wall of the mounting groove, and the inner ring of the bearing is interference-fitted with the outer periphery of the fastener.

13. A shifting machine according to claim 1, characterized in that, The locking pin is connected to an operating element, which can be operated to drive the locking pin to slide in a second direction.

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