Threshold lock device capable of limiting movement of container and working method

Abstract

The invention relates to the technical field of air freight, in particular to a container retaining threshold lock device and a working method thereof, and the container retaining threshold lock device comprises a mounting frame, a retaining pressing plate, a pressing plate torsion spring, a spring bolt, a spring bolt torsion spring and an unlocking pedal; the limiting pressing plate is movably connected with the mounting frame through the pressing plate torsion spring, the spring bolt is movably connected with the mounting frame through the spring bolt torsion spring, the limiting pressing plate is located on one side of the spring bolt and matched with the spring bolt, and the unlocking pedal is located on the outer side of the mounting frame and connected with the limiting pressing plate. The unlocking pedal is connected to the outer side of the limiting pressing plate, limiting of the spring bolt can be released by directly treading the pedal in the unlocking process, and therefore the spring bolt is turned outwards to be lower than the upper surface of the mounting frame through the spring bolt torsional spring, unlocking is time, a container can slide along the upper surface of the mounting frame conveniently, manual bowing operation is avoided, operation safety is guaranteed, and meanwhile the safety of the container is improved. Operation efficiency is improved, and actual operation requirements are met.

Description

Technical Field

[0001] This invention relates to the field of air cargo technology, specifically to a sill lock device and its working method for limiting the movement of a container. Background Technology

[0002] In freight systems, sill locks are used to prevent containers from shifting or falling during transport, restricting their movement and ensuring transport safety.

[0003] In the prior art, common movement limiting devices are usually operated manually. For example, Chinese invention patent application with publication number CN120573259A provides a movement limiting device for aviation container units. When it is necessary to unload the container unit, the support is manually pressed down to disengage the support's locking platform from the locking body's slot. Under the action of torsion spring II, the locking body falls clockwise and presses down on the support, preventing it from lifting.

[0004] The existing movement restriction device requires manual operation after bending over to unlock, which increases the difficulty of operation, reduces work efficiency, and is prone to safety hazards and increases operational risks in high-intensity loading and unloading operations, thus failing to meet actual use needs. Summary of the Invention

[0005] The purpose of this invention is to provide a threshold lock device and its working method for limiting the movement of containers, thereby solving the technical problem that current threshold locks require manual unlocking.

[0006] The solution of the present invention to the above-mentioned technical problems is as follows: A sill lock device for limiting the movement of a container includes a mounting bracket, a limiting pressure plate, a pressure plate torsion spring, a lock tongue, a lock tongue torsion spring, and an unlocking pedal. The limiting pressure plate is movably connected to the mounting bracket via a pressure plate torsion spring, and the locking tongue is movably connected to the mounting bracket via a locking tongue torsion spring. The limiting pressure plate is located on one side of the locking tongue and cooperates with the locking tongue. The unlocking pedal is located on the outside of the mounting bracket and is connected to the limiting pressure plate.

[0007] Further defined, the bottom end of the limiting pressure plate is rotatably connected to the mounting frame through the pressure plate pivot, the drive end of the pressure plate pivot extends to the outside of the mounting frame, and the unlocking pedal is set at the drive end of the unlocking pedal along the radial direction of the pressure plate pivot. The unlocking pedal drives the limiting pressure plate to rotate in the same direction as the pressure plate pivot through the pressure plate pivot. The pressure plate torsion spring is sleeved on the outside of the pressure plate shaft. The movable end of the pressure plate torsion spring is connected to the limiting pressure plate, and the fixed end of the pressure plate torsion spring is connected to the mounting bracket.

[0008] Further specified, the latch is rotatably connected to the mounting bracket via a latch pivot, the latch torsion spring is sleeved on the outside of the latch pivot, the movable end of the latch torsion spring is connected to the latch, the fixed end of the latch torsion spring is connected to the mounting bracket, and the pressure plate torsion spring has the opposite helical direction to the latch torsion spring.

[0009] Further specified, the bottom of the latch is provided with a latch end face, the latch end face faces the limiting pressure plate, and the latch end face is located outside the latch pivot; the top of the limiting pressure plate makes the latch stand upright by contacting the latch end face.

[0010] Furthermore, a limiting protrusion is provided at the top of the locking tongue end face, and the limiting protrusion cooperates with the top of the limiting pressure plate.

[0011] Furthermore, the bottom of the latch is provided with a pressure plate limiting surface, and the end face of the latch is located between the limiting protrusion and the pressure plate limiting surface. When the latch is turned outward, the pressure plate limiting surface contacts the top of the limiting pressure plate, so that the limiting pressure plate remains in a downward state.

[0012] Further defined, the top of the limiting pressure plate is provided with a limiting end face and a transition end face. When the lock tongue is upright, the limiting end face cooperates with the lock tongue end face, and the limiting protrusion cooperates with the top of the transition end face; when the lock tongue is turned outward, the transition end face cooperates with the limiting surface of the pressure plate. The limiting end face is located below the transition end face, and the angle between the limiting end face and the transition end face is an obtuse angle.

[0013] Furthermore, the sill lock device for limiting the movement of the container also includes multiple quick-release connectors, and the array of multiple quick-release connectors is arranged at both ends of the mounting frame.

[0014] Further specified, the quick-release connector includes a T-type connector, a self-locking nut, a torsion plate, and an elastic washer; The horizontal section of the T-joint is located below the mounting bracket, and the vertical section of the T-joint extends through the mounting bracket to the top of the mounting bracket. A rotating interface is provided at the top of the T-joint. The self-locking nut, torsion plate, and elastic washer are sequentially fitted on the outside of the vertical section of the T-joint from top to bottom. A limiting groove is provided on the mounting bracket, and the radial sidewall of the elastic washer extends to the top of the bottom of the limiting groove. An indicator arrow is provided on the torsion plate, and the indicator arrow is arranged in the same direction as the horizontal section of the T-joint.

[0015] A method for operating a sill lock for limiting the movement of a container, based on the aforementioned sill lock device for limiting the movement of a container, includes the following steps: Installation: After connecting the limiting pressure plate, pressure plate torsion spring, locking tongue, locking tongue torsion spring and unlocking pedal to the mounting bracket, the mounting bracket is connected to the designated position on the existing track via quick-release couplings; Unlocking; the latch flips outward under the action of the latch torsion spring, so that the latch is located below the upper surface of the mounting bracket, and the limiting pressure plate is kept in a downward state by contacting the top of the limiting pressure plate with the limiting pressure plate limiting surface; Locking; flip the latch upwards, the pressure plate limiting surface slides on the top of the limiting pressure plate until the pressure plate limiting surface disengages from the limiting pressure plate, the limiting pressure plate flips upwards under the action of the pressure plate torsion spring until it contacts the limiting protrusion, the flip latch continues to flip until the limiting end face and the latch end face are in contact.

[0016] The beneficial effects of this invention are as follows: 1. This invention connects an unlocking pedal to the outside of the limiting pressure plate. During the unlocking process, the limiting of the locking tongue can be released by stepping on the pedal. The locking tongue torsion spring is used to make the locking tongue flip outward and lower than the upper surface of the mounting frame, thus unlocking the container and facilitating the sliding of the container along the upper surface of the mounting frame. This avoids manual operation by bending over, ensuring operational safety while improving operational efficiency and meeting the needs of actual operations.

[0017] 2. This invention provides a limiting end face and a transition end face on the limiting pressure plate, and a lock tongue end face and a pressure plate limiting surface at the bottom of the lock tongue. This allows the lock tongue to be limited when it is upright by the limiting end face contacting the lock tongue end face. When the lock tongue flips outward, the limiting pressure plate is pressed down by the pressure plate limiting surface, which facilitates the lock tongue flipping back to upright. Under the action of the pressure plate torsion spring, the limiting pressure plate automatically flips up to contact the limiting protrusion, thereby reducing the difficulty of locking and improving the efficiency of operation.

[0018] 3. The mounting bracket of this invention connects to the existing track via a quick-release connector, facilitating assembly and disassembly. The efficiency of assembly and disassembly is improved by rotating the T-shaped connector, and the operation is aided by the indicator arrows, reducing the difficulty of operation and ensuring reliable installation. Attached Figure Description Figure 1 This is a schematic diagram of the unlocked state of the threshold lock device for limiting the movement of the container in this invention. Figure 2 This is a schematic diagram of the locked state of the threshold lock device for limiting the movement of the container according to the present invention; Figure 3 This is a schematic diagram of the interlocking state between the limiting pressure plate and the locking tongue of the present invention; Figure 4 This is a schematic diagram of the locking tongue flipping down and pressing the limiting pressure plate in the present invention; Figure 5 This is a schematic diagram of the quick-release connector structure of the present invention; Figure 6 A cross-sectional view of the T-type joint of the present invention along the length of the track. Figure 7 A cross-sectional view of the T-type connector of the present invention along the width of the track is provided.

[0019] In the diagram, 10-mounting bracket; 11-limiting groove; 20-unlocking pedal; 30-limiting pressure plate; 31-pressure plate torsion spring; 32-pressure plate pivot; 33-limiting end face; 34-transition end face; 40-lock tongue; 41-lock tongue torsion spring; 42-lock tongue pivot; 43-lock tongue end face; 44-limiting protrusion; 45-pressure plate limiting surface; 50-quick release connector; 51-T-type connector; 52-self-locking nut; 53-torsion plate; 54-elastic washer; 55-indicator arrow; 60-track. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Example 1 refer to Figure 1 and Figure 2This invention provides a sill lock device for limiting the movement of a container, including a mounting frame 10, a limiting pressure plate 30, a pressure plate torsion spring 31, a locking tongue 40, a locking tongue torsion spring 41, and an unlocking pedal 20. The mounting frame 10 is installed in conjunction with existing rails 60, and the length of the mounting frame 10 is designed according to the distance between two adjacent rails 60. The vertical cross-section of the mounting frame 10 is a U-shaped structure. The limiting pressure plate 30, pressure plate torsion spring 31, locking tongue 40, and locking tongue torsion spring 41 are all located within the mounting frame 10. When the locking tongue 40 is turned outward to a horizontal state, the entire locking tongue 40 is located below the upper surface of the mounting frame 10, avoiding obstruction of the container moving along the mounting frame 10. When the locking tongue 40 is upright, the top of the locking tongue 40 extends above the mounting frame 10 and cooperates with the limiting pressure plate 30 to lock the locking tongue 40, keeping it upright and limiting the movement of the container on the mounting frame 10.

[0025] Specifically, the limiting pressure plate 30 is movably connected to the mounting bracket 10 via the pressure plate torsion spring 31, allowing the limiting pressure plate 30 to rotate counterclockwise via the pressure plate torsion spring 31; the locking tongue 40 is movably connected to the mounting bracket 10 via the locking tongue torsion spring 41, allowing the locking tongue to rotate clockwise via the locking tongue torsion spring 41. The limiting pressure plate 30 is located on one side of the locking tongue 40 and cooperates with the locking tongue 40, so that the top of the limiting pressure plate 30 and the bottom of the locking tongue 40 abut against each other to achieve interlocking, ensuring that the locking tongue 40 functions stably and reliably.

[0026] The unlocking pedal 20 is located on the outside of the mounting bracket 10. The unlocking pedal 20 is connected to the limiting pressure plate 30. When unlocking, the operator steps on the unlocking pedal 20, which drives the limiting pressure plate 30 to compress the pressure plate torsion spring 31, causing the limiting pressure plate 30 to rotate clockwise downwards, thus releasing the interlock. The locking tongue 40 rotates clockwise to the outward flip state under the action of the locking tongue torsion spring 41, thereby unlocking. The operation is simple and convenient, avoiding manual operation, improving operating efficiency, and ensuring operating safety.

[0027] To further explain, the bottom end of the limiting pressure plate 30 is rotatably connected to the mounting frame 10 via the pressure plate rotating shaft 32. The pressure plate rotating shaft 32 is rotatably connected to the mounting frame 10, and the limiting pressure plate 30 is sleeved on the pressure plate rotating shaft 32 and connected to the pressure plate rotating shaft 32 via a pin. The pressure plate torsion spring 31 is sleeved on the outside of the pressure plate rotating shaft 32. The movable end of the pressure plate torsion spring 31 is connected to the limiting pressure plate 30, and the fixed end of the pressure plate torsion spring 31 is connected to the mounting frame 10. Preferably, the pressure plate torsion spring 31 is located in the middle position of the limiting pressure plate 30 to ensure that its force is stable and balanced.

[0028] At this time, the drive end of the pressure plate shaft 32 extends through the side wall of the mounting frame 10 to the outside of the mounting frame 10. The unlocking pedal 20 is set at the drive end of the unlocking pedal 20 along the radial direction of the pressure plate shaft 32. The unlocking pedal 20 drives the limiting pressure plate 30 to rotate in the same direction as the pressure plate shaft 32 through the pressure plate shaft 32, so that when the unlocking pedal 20 contacts the ground, the top of the limiting pressure plate 30 is close to or in contact with the bottom of the inner wall of the mounting frame 10. After the locking tongue 40 is erected, when the limiting pressure plate 30 and the locking tongue 40 are interlocked, the step surface of the unlocking pedal 20 is horizontal, which is convenient for operation.

[0029] The locking tongue 40 is rotatably connected to the mounting bracket 10 via the locking tongue pivot 42. The bottom of the locking tongue 40 is connected to the locking tongue pivot 42 via a pin. The locking tongue torsion spring 41 is sleeved on the outside of the locking tongue pivot 42. The movable end of the locking tongue torsion spring 41 is connected to the locking tongue 40, and the fixed end of the locking tongue torsion spring 41 is connected to the mounting bracket 10. The pressure plate torsion spring 31 has the opposite helical direction to the locking tongue torsion spring 41, thereby realizing the interlocking between the locking tongue 40 and the limiting pressure plate 30.

[0030] To further explain, the bottom of the latch 40 is provided with a latch end face 43, which faces the limiting pressure plate 30 and is located outside the latch pivot 42. The top of the limiting pressure plate 30 keeps the latch 40 in an upright state by contacting the latch end face 43. At this time, the limiting pressure plate 30 is in a horizontal state. The latch end face 43 occupies the space for the limiting pressure plate 30 to rotate counterclockwise, and similarly, the limiting pressure plate 30 occupies the space for the latch 40 to rotate clockwise. The two are interlocked.

[0031] refer to Figure 3 To ensure stable and reliable interlocking, it is preferable to set a limiting protrusion 44 above the bolt end face 43 to prevent the limiting pressure plate 30 from disengaging from the bolt end face 43 and causing locking failure; the limiting protrusion 44 blocks the top of the limiting pressure plate 30 when the bolt 40 is in the upright state, thus limiting its counterclockwise rotation.

[0032] To further explain, in order to prevent the limiting pressure plate 30 from disengaging from the lock tongue 40 and rotating counterclockwise when the lock tongue 40 flips outward to a horizontal position, a pressure plate limiting surface 45 is preferably provided at the bottom of the lock tongue 40. The end face 43 of the lock tongue is located between the limiting protrusion 44 and the pressure plate limiting surface 45, so that when the lock tongue 40 flips outward, the pressure plate limiting surface 45 contacts the top of the limiting pressure plate 30, keeping the limiting pressure plate 30 in a downward pressing state. The pressure plate limiting surface 45 is preferably an arc surface, so that the lock tongue 40 rotates counterclockwise to an upright position. During the process, the pressure plate 30 is kept pressed down until the latch 40 flips to the pressure plate limiting surface 45 and disengages from the pressure plate 30. At this time, the pressure plate 30 rotates counterclockwise under the action of the pressure plate torsion spring 31 until it contacts the limiting protrusion 44. Then, as the latch 40 continues to flip counterclockwise to stand upright, the pressure plate 30 rotates clockwise under the action of the limiting protrusion 44. The angle between the latch end face 43 and the pressure plate 30 gradually decreases until the two fit together, thus completing the interlocking.

[0033] Preferred, Reference Figure 4 The top of the limiting pressure plate 30 is provided with a limiting end face 33 and a transition end face 34. When the locking tongue 40 is upright, the limiting end face 33 and the locking tongue end face 43 are fitted together to achieve interlocking. The limiting protrusion 44 cooperates with the top of the transition end face 34 to limit the limiting pressure plate 30. When the locking tongue 40 is turned outward, the transition end face 34 cooperates with the pressure plate limiting surface 45 to press it down. The limiting end face 33 is located below the transition end face 34, and the included angle between the limiting end face 33 and the transition end face 34 is an obtuse angle.

[0034] Example 2 Based on the container movement limiting sill lock device described in Embodiment 1, this embodiment provides a container movement limiting sill lock device, which also includes a plurality of quick-release connectors 50. The plurality of quick-release connectors 50 are arrayed at both ends of the mounting frame 10, so that the mounting frame 10 is detachably connected to the track 60 through the quick-release connectors 50.

[0035] For details, please refer to Figure 5 The quick-release connector 50 includes a T-type connector 51, a self-locking nut 52, a twist plate 53, and an elastic washer 54; wherein, the inside of the rail 60 is provided with a snap-fit ​​groove along its length, and the top of the rail 60 is provided with a connector gap along its length, and the snap-fit ​​groove and the connector gap are connected.

[0036] The horizontal section of the T-connector 51 is located below the mounting bracket 10, and the vertical section of the T-connector 51 extends through the mounting bracket 10 to the top of the mounting bracket 10. The top of the T-connector 51 is provided with a rotating interface, such as an internal hexagonal interface or a cross interface, so that the T-connector 51 can be rotated by using the corresponding tool with the rotating interface. The internal hexagonal interface is used as an example for explanation.

[0037] The self-locking nut 52, the twisting plate 53, and the elastic washer 54 are sequentially fitted onto the outer side of the vertical section of the T-joint 51 from top to bottom. A limiting groove 11 is provided on the mounting bracket 10. The radial sidewall of the elastic washer 54 extends to the top of the bottom of the limiting groove 11, that is, the limiting groove 11 is fitted onto the outer side of the elastic washer 54. The bottom surface of the outer ring of the elastic washer 54 contacts the bottom of the inner side of the limiting groove 11, and the top surface of the elastic washer 54 contacts the bottom of the twisting plate 53. The elastic washer 54 can be a butterfly spring washer.

[0038] The twisted piece 53 is connected to the T-type connector 51. In order to facilitate the determination of the direction of the T-type connector 51, it is preferable to provide an indicator arrow 55 on the upper end surface of the twisted piece 53. The indicator arrow 55 is set in the same direction as the horizontal section of the T-type connector 51.

[0039] During installation, first determine the installation position of the T-joint 51 on the rail 60. Then, align the horizontal section of the T-joint 51 with the joint gap and extend it downwards along the joint gap to the locking groove. Figure 6 As shown; at this point, the indicator arrow 55 is aligned with the length of the track 60. Then, using a hex wrench in conjunction with the rotating interface, rotate counterclockwise. The torsion plate 53 rotates synchronously with the T-joint 51 until the indicator arrow 55 is aligned with the width of the track 60, as shown. Figure 7 As shown; during the rotation, the T-joint 51 is kept under pressure, which causes the twisting plate 53 to squeeze and compress the elastic washer 54. The horizontal section of the T-joint 51 moves down, ensuring that the entire horizontal section of the T-joint 51 is located in the snap-fit ​​groove. After the rotation is completed, the downward pressure is removed, and the horizontal section of the T-joint 51 is snapped into the top of the track 60 by the compressed elastic washer 54, ensuring a stable and reliable connection.

[0040] Example 3 Based on the container movement-limiting sill lock device provided in Embodiment 2, this embodiment provides a container movement-limiting sill lock operation method, including the following steps: Installation: After connecting the limiting pressure plate 30, pressure plate torsion spring 31, locking tongue 40, locking tongue torsion spring 41 and unlocking pedal 20 to the mounting frame 10, the mounting frame 10 is connected to the designated position of the existing track 60 through the quick-release connector 50. Unlock; the latch 40 flips outward under the action of the latch torsion spring 41, so that the latch 40 is located below the upper surface of the mounting bracket 10, and the limiting pressure plate 30 is kept in a downward state by the contact between the pressure plate limiting surface 45 and the top of the limiting pressure plate 30. Locking; flipping the latch 40 upward, the pressure plate limiting surface 45 slides on the top of the limiting pressure plate 30 until the pressure plate limiting surface 45 disengages from the limiting pressure plate 30, the limiting pressure plate 30 flips upward under the action of the pressure plate torsion spring 31 until it contacts the limiting protrusion 44, and the flipping latch 40 continues to flip until the limiting end face 33 aligns with the latch end face 43.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the 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 illustrative and non-limiting in all respects, 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 scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A threshold lock device for limiting the movement of a container, characterized in that, It includes a mounting bracket (10), a limiting pressure plate (30), a pressure plate torsion spring (31), a locking tongue (40), a locking tongue torsion spring (41), and an unlocking pedal (20). The limiting pressure plate (30) is movably connected to the mounting bracket (10) via a pressure plate torsion spring (31), the locking tongue (40) is movably connected to the mounting bracket (10) via a locking tongue torsion spring (41), the limiting pressure plate (30) is located on one side of the locking tongue (40) and cooperates with the locking tongue (40), the unlocking pedal (20) is located on the outside of the mounting bracket (10), and the unlocking pedal (20) is connected to the limiting pressure plate (30).

2. The sill lock device for limiting the movement of a container according to claim 1, characterized in that, The bottom end of the limiting pressure plate (30) is rotatably connected to the mounting frame (10) through the pressure plate rotating shaft (32). The driving end of the pressure plate rotating shaft (32) extends to the outside of the mounting frame (10). The unlocking pedal (20) is arranged at the driving end of the unlocking pedal (20) along the radial direction of the pressure plate rotating shaft (32). The unlocking pedal (20) drives the limiting pressure plate (30) and the pressure plate rotating shaft (32) to rotate in the same direction through the pressure plate rotating shaft (32). The pressure plate torsion spring (31) is sleeved on the outside of the pressure plate rotating shaft (32). The movable end of the pressure plate torsion spring (31) is connected to the limiting pressure plate (30), and the fixed end of the pressure plate torsion spring (31) is connected to the mounting bracket (10).

3. The sill lock device for limiting the movement of a container according to claim 2, characterized in that, The latch (40) is rotatably connected to the mounting bracket (10) via the latch pivot (42). The latch torsion spring (41) is sleeved on the outside of the latch pivot (42). The movable end of the latch torsion spring (41) is connected to the latch (40), and the fixed end of the latch torsion spring (41) is connected to the mounting bracket (10). The pressure plate torsion spring (31) has the opposite helical direction to the latch torsion spring (41).

4. The sill lock device for limiting the movement of a container according to claim 3, characterized in that, The bottom of the latch (40) is provided with a latch end face (43), which faces the limiting pressure plate (30) and is located outside the latch pivot (42). The top of the limiting pressure plate (30) makes the latch (40) stand upright by contacting the latch end face (43).

5. The sill lock device for limiting the movement of a container according to claim 4, characterized in that, The top of the locking tongue end face (43) is provided with a limiting protrusion (44), which cooperates with the top of the limiting pressure plate (30).

6. The sill lock device for limiting the movement of a container according to claim 5, characterized in that, The bottom of the latch (40) is also provided with a pressure plate limiting surface (45). The end face (43) of the latch is located between the limiting protrusion (44) and the pressure plate limiting surface (45). When the latch (40) is turned outward, the pressure plate limiting surface (45) contacts the top of the limiting pressure plate (30) so that the limiting pressure plate (30) remains in a downward state.

7. The sill lock device for limiting the movement of a container according to claim 6, characterized in that, The top of the limiting pressure plate (30) is provided with a limiting end face (33) and a transition end face (34). When the latch (40) is upright, the limiting end face (33) cooperates with the latch end face (43), and the limiting protrusion (44) cooperates with the top of the transition end face (34). When the latch (40) is turned outward, the transition end face (34) cooperates with the limiting surface (45) of the pressure plate. The limiting end face (33) is located below the transition end face (34), and the angle between the limiting end face (33) and the transition end face (34) is an obtuse angle.

8. The sill lock device for limiting the movement of a container according to claim 7, characterized in that, The sill lock device for limiting the movement of the container also includes multiple quick-release connectors (50), which are arranged in an array at both ends of the mounting frame (10).

9. The sill lock device for limiting the movement of a container according to claim 8, characterized in that, The quick-release connector (50) includes a T-type connector (51), a self-locking nut (52), a twist plate (53), and an elastic washer (54). The horizontal section of the T-joint (51) is located below the mounting bracket (10), and the vertical section of the T-joint (51) extends through the mounting bracket (10) to the top of the mounting bracket (10). A rotating interface is provided at the top of the T-joint (51). The self-locking nut (52), the twisting plate (53), and the elastic washer (54) are sequentially fitted on the outside of the vertical section of the T-joint (51) from top to bottom. A limiting groove (11) is provided on the mounting bracket (10). The radial sidewall of the elastic washer (54) extends to the top of the bottom of the limiting groove (11). An indicator arrow (55) is provided on the twisting plate (53). The indicator arrow (55) is arranged in the same direction as the horizontal section of the T-joint (51).

10. A method for operating a threshold lock to limit the movement of a container, characterized in that, The sill lock device for limiting the movement of a container as described in claim 9 includes the following steps: Installation; After connecting the limiting pressure plate (30), pressure plate torsion spring (31), locking tongue (40), locking tongue torsion spring (41) and unlocking pedal (20) to the mounting bracket (10), the mounting bracket (10) is connected to the existing track (60) at the designated position via quick-release connector (50); Unlock; the latch (40) flips outward under the action of the latch torsion spring (41), so that the latch (40) is located below the upper surface of the mounting bracket (10), and the limiting pressure plate (30) is kept pressed down by the contact between the pressure plate limiting surface (45) and the top of the limiting pressure plate (30); Lock; flip the latch (40) upward, the pressure plate limiting surface (45) slides on the top of the limiting pressure plate (30) until the pressure plate limiting surface (45) disengages from the limiting pressure plate (30), the limiting pressure plate (30) flips upward under the action of the pressure plate torsion spring (31) until it contacts the limiting protrusion (44), and the flip latch (40) continues to flip until the limiting end face (33) aligns with the latch end face (43).

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