An inlaid type carriage cargo fixing device

Abstract

This application relates to the field of vehicle cargo securing technology, and in particular to an embedded cargo securing device for a vehicle compartment. The device includes an embedded base fitted into the side wall of the vehicle compartment. The base has a dovetail-shaped guide groove. A sliding block slides along the groove and is connected to a telescopic adjusting rod. The adjusting rod is connected to a flexible strap via a universal joint. A quick-release buckle is provided at the end of the strap. This device is embedded and integrated, does not occupy cargo space, uses magnetic positioning for the sliding block, and features multi-point cross-wrapping of the strap, making it adaptable to irregular or soft cargo and achieving rapid locking and reliable restraint.

Description

Technical Field

[0001] This invention relates to the field of transportation equipment technology, and in particular to an embedded cargo securing device for a vehicle. Background Technology

[0002] With the rapid development of the logistics and transportation industry, cargo securing devices inside freight cars play a crucial role in ensuring transportation safety and preventing cargo shifting or damage. However, existing cargo securing structures generally suffer from problems such as exposed structures, large space occupation, poor adaptability, and inability to achieve integrated design with the freight car body, making it difficult to meet the demands of modern logistics for efficient, compact, and intelligent loading systems.

[0003] A search revealed a cargo securing frame for a train carriage with publication number CN218966795U, authorized on May 5, 2023. This invention uses components such as a movable plate, a moving block, a clamping plate, and supporting springs to clamp and secure cargo of different sizes and heights. However, the device is an independent frame structure that needs to be installed separately inside the carriage, occupying valuable cargo space and remaining in a fixed position even when not in use, thus hindering flexible cargo placement. Furthermore, its clamping mechanism relies on spring force adjustment, which is prone to fatigue after prolonged use, leading to insufficient clamping force and affecting the reliability of the fixation.

[0004] A search revealed a multifunctional sliding mechanism and carriage for securing goods, with publication number CN222247006U, and an authorization announcement date of December 27, 2024. This invention features an inverted T-shaped sliding groove on the inner wall of the carriage, coupled with detachable buckles to secure goods in any position, offering good flexibility. However, this sliding mechanism is still an add-on installation structure, requiring separate installation after the carriage is manufactured. Furthermore, the sliding groove is exposed on the inner surface of the carriage, making it prone to dust accumulation and damage, affecting aesthetics and cleanliness. More importantly, its fixing points are limited to the edge of the sliding groove, failing to achieve embedded constraint on the bottom or internal structure of the goods, thus limiting its effectiveness in securing irregular or soft goods.

[0005] The aforementioned problems indicate that existing cargo securing devices for freight cars mostly adopt external, additional, or semi-fixed structures, making it difficult to achieve deep integration with the freight car body. This results in drawbacks such as low space utilization, structural redundancy, and insufficient adaptability. Therefore, this invention proposes an embedded cargo securing device for freight cars, aiming to fully integrate the securing mechanism within the freight car structure. This allows for rapid, stable, and adaptive securing of various types of cargo without occupying freight car loading space, thereby improving transportation safety and loading / unloading efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide an embedded cargo securing device for a wagon body, in order to solve the problems mentioned in the background art, such as existing cargo securing structures being mostly additional installations, occupying cargo space, springs being prone to fatigue failure, exposed grooves being prone to dust accumulation and limited fixing points, difficulty in effectively restraining irregular or soft cargo, and lack of integrated design with the wagon body.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an embedded cargo securing device for a carriage, comprising an embedded base disposed inside the side wall of the carriage, the embedded base extending longitudinally along the carriage and embedded in the interlayer of the side wall of the carriage, the inner surface of the embedded base having a plurality of spaced guide grooves, each guide groove having a dovetail-shaped cross-section, a sliding block slidably fitting within the guide groove, the outer end face of the sliding block being connected to a telescopic adjusting rod, the telescopic adjusting rod comprising an outer tube and an inner rod, one end of the outer tube being fixed The inner rod is fixedly connected to the sliding block. One end of the inner rod is inserted into the outer tube and its length is locked by engaging with multiple axially arranged positioning holes on the outer tube through a limiting pin. The other end of the inner rod is connected to a universal joint. The universal joint is connected to one end of a flexible strap through a ball joint. The flexible strap is woven from high-strength polyester fiber and has an anti-slip texture on its surface. The other end of the flexible strap is connected to a quick-release connector. The quick-release connector includes a male buckle and a female buckle, which are respectively set at the ends of adjacent flexible straps for mutual insertion and locking.

[0008] Preferably, the upper and lower edges of the mounting base are respectively provided with connecting flanges that are welded and fixed to the inner and outer panels of the side wall of the carriage. The connecting flanges are provided with bolt through holes. The mounting base is fixed to the inside of the side wall structure of the carriage by high-strength bolts, so that the mounting base and the carriage body form an integral structure and do not protrude additionally from the inner cavity of the carriage.

[0009] Preferably, the bottom of the guide groove is provided with a magnetic strip, and the bottom of the sliding block is embedded with a permanent magnet. The permanent magnet and the magnetic strip generate an attraction force, so that the sliding block is held in any position in the guide groove when no external force is applied, preventing the sliding block from sliding on its own due to vibration during transportation.

[0010] Preferably, the universal joint includes a ball head seat and a ball head pin. The ball head seat is fixed to the end of the inner rod. One end of the ball head pin is a spherical structure and is embedded inside the ball head seat. The other end is fixedly connected to a flexible strap. An annular pressure cap is provided at the opening of the ball head seat. The annular pressure cap is screwed onto the outer circumference of the ball head seat by threads to restrict the ball head pin from coming out, while allowing the ball head pin to rotate freely in three-dimensional space.

[0011] Preferably, the flexible strap has an adjusting buckle in the middle. The adjusting buckle is made of metal and has an elliptical inner hole. After the flexible strap passes through the adjusting buckle, it can be pulled along the length direction. The tension of the strap can be manually adjusted by frictional resistance. After adjustment, the strap self-locks in the adjusting buckle.

[0012] Preferably, the male snap-fit ​​connector has a tapered guide head at its male end and an elastic claw inside the female snap-fit ​​connector. When the male snap-fit ​​is inserted into the female snap-fit ​​connector, the tapered guide head pushes the elastic claw outward to expand. After the male snap-fit ​​is fully inserted, the elastic claw springs back and locks into the annular groove on the outer periphery of the male snap-fit ​​connector, thus achieving mechanical interlocking. Both the male snap-fit ​​connector and the female snap-fit ​​connector have anti-accidental touch unlocking buttons on their outer surfaces. Pressing the unlocking button will cause the elastic claw to retract and release the interlocking state.

[0013] Preferably, the mounting base has two rows of guide grooves arranged along the height direction inside the side wall of the carriage. The upper and lower rows of guide grooves are staggered, and the distance between each row of guide grooves is 300mm to 500mm. This allows the flexible straps to flexibly select connection points according to the height of the goods, forming a cross-binding network to cover and fix irregularly shaped or soft goods at multiple points.

[0014] Preferably, the inner wall of the outer tube is provided with a spiral guide groove, and the outer periphery of the inner rod is provided with a protruding rib that engages with the spiral guide groove. When the inner rod rotates relative to the outer tube, the protruding rib moves along the spiral guide groove to realize the axial extension and retraction of the inner rod. The limiting pin passes through the side wall of the outer tube and is inserted into the positioning hole on the inner rod. The positioning holes are evenly distributed along the axial direction of the inner rod with a spacing of 20mm. The extension length can be adjusted by pulling out the limiting pin and rotating the inner rod, and then inserted into the corresponding positioning hole to complete the locking.

[0015] Preferably, the flexible strap has a width of 40mm to 80mm and a thickness of 2mm to 4mm, and its edges are heat-sealed to prevent fiber detachment. The anti-slip texture is a continuous wavy protrusion with a protrusion height of 0.3mm to 0.6mm to enhance the coefficient of friction with the surface of the goods.

[0016] Preferably, the mounting base is made of aluminum alloy extrusion molding and has a reinforcing rib structure inside. The reinforcing rib extends longitudinally and is connected to the back of the guide groove to improve the overall rigidity of the mounting base and prevent deformation under long-term stress.

[0017] The beneficial effects of this invention are as follows: Through the above structure, the fixing device is completely embedded in the side wall structure of the carriage, without occupying effective cargo space; the sliding block and guide groove are used to achieve arbitrary position adjustment of the fixing point, and the universal joint and flexible strap form a multi-degree-of-freedom constraint system, which can adapt to goods of different sizes, shapes and degrees of softness and hardness; the quick-release connector provides quick connection and reliable locking, avoiding the fatigue failure problem of traditional spring structure; magnetic positioning prevents the slider from sliding accidentally, improving stability during transportation; the overall structure is integrated with the carriage body, improving space utilization and structural reliability. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a partial three-dimensional structural diagram of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the structure of region A in the middle; Figure 4 For the present invention Figure 2 Schematic diagram of the structure of region B in the middle; Explanation of reference numerals in the attached figures: 1. Mounting base; 2. Carriage side wall; 3. Guide groove; 4. Sliding block; 5. Telescopic adjustable rod; 6. Outer tube; 7. Inner rod; 8. Limit pin; 9. Positioning hole; 10. Universal joint; 11. Ball head seat; 12. Ball head pin; 13. Annular cover; 14. Flexible strap; 15. Anti-slip texture; 16. Quick-release connector; 17. Male buckle; 18. Female buckle; 19. Connecting flange; 20. Bolt through hole; 21. Magnetic strip; 22. Permanent magnet; 23. Adjusting ring; 24. Conical guide head; 25. Elastic claw. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Specific implementation examples are given below.

[0021] See Figures 1-4 The present invention provides an embedded cargo fixing device for a carriage, the entire structure of which is completely integrated into the interior of the side wall 2 of the carriage and does not protrude from the interior cavity of the carriage, thereby effectively preserving all cargo space; the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The core component of this invention is the mounting base 1, which extends longitudinally along the carriage and is integrally embedded in the sandwich structure of the carriage side wall 2. The mounting base 1 is made of aluminum alloy material through extrusion molding process, and has a longitudinally extending reinforcing rib structure inside. The reinforcing rib is connected to the back of the guide groove 3 to improve the overall rigidity of the mounting base 1 under long-term stress and prevent plastic deformation. The upper and lower edges of the mounting base 1 are respectively provided with connecting flanges 19, and multiple bolt through holes 20 are opened on the connecting flanges 19. High-strength bolts are passed through the bolt through holes 20 to fasten the mounting base 1 to the structure of welding and fixing the inner and outer plates of the carriage side wall 2, so that the mounting base 1 and the carriage body form an integral structure, ensuring that it will not loosen or fall off due to vibration or impact during transportation. Several spaced guide grooves 3 are provided on the inner side of the mounting base 1 (i.e., the side facing the interior of the carriage). The cross-section of the guide groove 3 is dovetail-shaped, which can effectively prevent the sliding block 4 from coming off in the direction perpendicular to the groove. A sliding block 4 is slidably fitted in each guide groove 3. The shape of the sliding block 4 matches the dovetail-shaped cross-section of the guide groove 3, so that it can only slide along the axial direction of the guide groove 3 and cannot come off. A permanent magnet 22 is embedded in the bottom of the sliding block 4, and a magnetic strip 21 is provided in the bottom of the guide groove 3. A stable attraction force is generated between the permanent magnet 22 and the magnetic strip 21, so that the sliding block 4 can be kept in any position in the guide groove 3 when there is no external force, avoiding the sliding block 4 from sliding off by itself due to vibration during vehicle operation, thereby ensuring the positional stability of the fixing point. A telescopic adjusting rod 5 is fixedly connected to the outer end face (i.e., the side facing the interior of the carriage) of the sliding block 4. The telescopic adjusting rod 5 consists of an outer tube 6 and an inner rod 7. One end of the outer tube 6 is fixed to the outer end face of the sliding block 4 by welding or threaded connection, and one end of the inner rod 7 is inserted into the internal cavity of the outer tube 6. The inner wall of the outer tube 6 is provided with a spiral guide groove (not separately labeled in the figure), and the outer periphery of the inner rod 7 is provided with a protrusion (not separately labeled in the figure) that engages with the spiral guide groove. When the inner rod 7 rotates relative to the outer tube 6, the protrusion moves along the spiral guide groove, thereby driving the inner rod 7 to rotate. The rod 7 extends or retracts axially to achieve continuous length adjustment; a limit pin 8 is installed through the side wall of the outer tube 6, and multiple positioning holes 9 are evenly distributed along the axial direction of the inner rod 7, with a spacing of 20mm between adjacent positioning holes 9; when it is necessary to adjust the length of the telescopic adjustable rod 5, the operator pulls out the limit pin 8, rotates the inner rod 7 to extend it to the required length, and then inserts the limit pin 8 into the corresponding positioning hole 9 to complete the length locking; this structure avoids the problem of fatigue failure of traditional spring return mechanisms, while providing precise length adjustment capability; The other end of the inner rod 7 (i.e., the end away from the sliding block 4) is connected to a universal joint 10; the universal joint 10 includes a ball head seat 11 and a ball head pin 12, wherein the ball head seat 11 is fixed to the end of the inner rod 7 and forms a spherical cavity inside it; one end of the ball head pin 12 is a spherical structure, which is embedded in the spherical cavity of the ball head seat 11, and the other end is fixedly connected to one end of the flexible strap 14 by riveting, sewing or metal crimping; an annular pressure cap 13 is provided at the opening of the ball head seat 11, and the annular pressure cap 13 is screwed onto the outer circumferential thread of the ball head seat 11 by external thread, thereby restricting the ball head pin 12 inside the ball head seat 11 to prevent it from falling out, while allowing the ball head pin 12 to rotate freely in three-dimensional space, so as to realize the angle adjustment of the flexible strap 14 in any direction to adapt to the needs of fixing goods of different shapes and positions; The flexible strap 14 is woven from high-strength polyester fiber, with a width of 40mm to 80mm and a thickness of 2mm to 4mm. The edges are heat-sealed to prevent fiber detachment during use. The surface of the flexible strap 14 is provided with anti-slip texture 15, which is a continuous wavy raised texture with a height of 0.3mm to 0.6mm. This texture is used to increase the coefficient of friction with the surface of the goods and prevent the strap from slipping under stress. The flexible strap 14 has an adjusting buckle 23 in the middle. The adjusting buckle 23 is made of metal and has an elliptical inner hole. The flexible strap 14 passes through the adjusting buckle 23 from one end and then folds back to form a double-layer structure. The operator can adjust the effective length of the strap by manually pulling the free end of the strap. The tension is manually adjusted by utilizing the frictional resistance between the strap and the inner wall of the adjusting buckle 23. After adjustment, the strap self-locks in the adjusting buckle 23 by friction, without the need for an additional locking mechanism. The flexible strap 14 is connected to a quick-release connector 16 at its end. The quick-release connector 16 includes a male buckle 17 and a female buckle 18, which are respectively located at the ends of two adjacent flexible straps 14. The male buckle 17 has a tapered guide head 24 at its end, and the female buckle 18 has an elastic claw 25 inside. When the male buckle 17 is inserted into the female buckle 18, the tapered guide head 24 first contacts the inner inclined surface of the elastic claw 25, pushing the elastic claw 25 to expand outward. When the male buckle 17 is fully inserted, the elastic claw 25 rebounds under its own elastic force and locks into the annular groove (not labeled in the figure) on the outer periphery of the male buckle 17, forming a mechanical interlock to prevent accidental disengagement. The outer surfaces of the male buckle 17 and the female buckle 18 are provided with an anti-accidental touch unlock button (not labeled separately in the figure). Pressing the unlock button will cause the elastic claw 25 to retract inward and disengage from the annular groove, thereby releasing the interlock and realizing quick disassembly. The mounting base 1 has two rows of guide grooves 3 arranged along the height direction inside the side wall 2 of the carriage. The upper and lower rows of guide grooves 3 are staggered, that is, the positions of the upper and lower rows of guide grooves 3 are staggered in the horizontal direction. The vertical spacing between each row of guide grooves 3 is 300mm to 500mm. This layout allows the operator to flexibly select the upper or lower row of sliding blocks 4 as fixing points according to the actual height of the goods. It is even possible to use the upper and lower rows of sliding blocks 4 at the same time to cross-connect the flexible straps 14 to form a multi-point covering cross-binding network. It is especially suitable for fixing irregularly shaped or soft goods (such as bagged grain, foam products, textile rolls, etc.) to avoid local stress concentration that causes deformation or slippage of the goods. In actual use, the operator first selects the appropriate position of the sliding block 4 in the guide groove 3 of the mounting base 1 according to the size, shape and center of gravity of the goods to be fixed, and temporarily fixes it by using the attraction force of the magnetic strip 21 and the permanent magnet 22; then, pull out the limiting pin 8, rotate the inner rod 7 to adjust the length of the telescopic adjustment rod 5 so that the flexible strap 14 can cover the goods and leave an appropriate tension margin, and then insert the limiting pin 8 into the corresponding positioning hole 9 to complete the length locking; next, wrap the flexible strap 14 around the goods, manually tighten the strap to the appropriate tension by adjusting the buckle 23, and finally insert and lock the male buckle 17 and female buckle 18 at the ends of the adjacent flexible straps 14; due to the presence of the universal joint 10, the flexible strap 14 can freely adjust the angle in three-dimensional space to ensure that the strap and the contact surface of the goods are closely attached and the force is even; After installation, all structures are located inside or close to the inner wall of the carriage side wall 2, without occupying any effective cargo space. The mounting base 1 is firmly connected to the carriage structure through the connecting flange 19, forming an integrated load-bearing system and improving the overall structural reliability. The sliding block 4, telescopic adjustable rod 5, universal joint 10, flexible strap 14 and quick-release connector 16 together constitute a multi-degree-of-freedom, adjustable and reusable cargo restraint system, which can adapt to various cargo types and loading conditions, and solves the problems of space occupation, limited fixing points, easy spring failure and dust accumulation in the chute of existing additional fixing devices. Furthermore, since the guide groove 3 is completely embedded inside the mounting base 1, and its opening faces the inner cavity of the carriage but is covered by the sliding block 4, it is not easy for dust to accumulate or foreign objects to enter when not in use, thus ensuring smooth sliding fit; the flexible strap 14 is made of high-strength polyester fiber material, which has excellent tensile strength and weather resistance, and can be used repeatedly for a long time without aging or breaking; the mechanical interlocking structure of the quick-release connector 16 ensures the reliability of the connection, and it is not easy to loosen even in a severe vibration environment, while the unlocking operation is simple and convenient for loading and unloading operations; In summary, this invention constructs a compact, flexible, reliable, and space-efficient embedded cargo fixing system by embedding the mounting base 1 into the side wall 2 of the carriage, setting a dovetail-shaped guide groove 3 to cooperate with the sliding block 4, using magnetic positioning, configuring a telescopic adjustment rod 5 and a universal joint 10, and combining a flexible strap 14 and a quick-release connector 16. This system fully meets the needs of modern logistics transportation for efficient, safe, and multifunctional cargo fixing. To enable those skilled in the art to fully understand and implement this invention, the following further supplements the specific implementation principle of this invention in conjunction with a specific application scenario; In a van transporting a batch of bagged rice, an embedded base 1 is pre-installed in the side wall 2 of the van. The embedded base 1 is connected to the inner and outer panels of the side wall 2 of the van by high-strength bolts through the bolt through holes 20 on the connecting flange 19, forming an integrated load-bearing structure. The operator first observes that the stacked height of the goods is about 1.2 meters. Based on this, two sliding blocks 4 in the upper row of guide slides 3 located in the middle area of ​​the side wall 2 of the van are selected as the left fixing points, and two horizontally misaligned sliding blocks 4 in the lower row of guide slides 3 are selected as the right fixing points. Since the upper and lower rows of guide slides 3 are arranged in a staggered manner, the selected sliding blocks 4 do not coincide in the horizontal direction, providing a geometric basis for subsequent cross restraint. Subsequently, the operator slides the sliding block 4 axially along the guide groove 3 to the desired lateral position. At this time, the permanent magnet 22 at the bottom of the sliding block 4 attracts the magnetic strip 21 at the bottom of the guide groove 3, temporarily stabilizing the sliding block 4 in this position and preventing displacement due to vehicle vibration. Next, the operator pulls out the limiting pin 8 on the side wall of the outer tube 6 of the telescopic adjustment rod 5, rotates the inner rod 7, and moves its outer circumferential protrusion along the spiral guide groove on the inner wall of the outer tube 6, causing the inner rod 7 to extend axially. When the extension length of the inner rod 7 is sufficient for the flexible strap 14 to pass over the top of the cargo and leave an adjustment margin of about 150mm, the rotation is stopped, and the limiting pin 8 is inserted into the positioning hole 9 with a corresponding spacing of 20mm on the inner rod 7 to complete the length locking. At this point, one end of the flexible strap 14 is connected to the inner rod 7 via the universal joint 10. The spherical end of the ball pin 12 is embedded in the spherical cavity of the ball head seat 11. The annular cap 13 is screwed onto the outer thread of the ball head seat 11, restricting the ball pin 12 from coming out but allowing it to rotate freely in three-dimensional space. The operator wraps the flexible strap 14 around the cargo and uses the angular self-adaptation of the universal joint 10 to make the flexible strap 14 naturally conform to the arc-shaped top contour of the bagged rice, avoiding local suspension or stress concentration. Subsequently, the operator manually pulls the free end of the flexible strap 14, allowing it to pass through the adjusting buckle 23 and then fold back to form a double-layer structure. The tension is adjusted by frictional resistance until the anti-slip texture 15 on the surface of the flexible strap 14 is in close contact with the surface of the cargo without any obvious looseness. Finally, the male buckle 17 and female buckle 18 at the ends of the two adjacent flexible straps 14 are aligned and inserted. The conical guide head 24 at the end of the male buckle 17 first contacts the inclined surface of the elastic claw 25 inside the female buckle 18, pushing the elastic claw 25 to deform outward elastically. When the male buckle 17 is fully inserted, the elastic claw 25 rebounds under its own elastic force and is locked into the annular groove on the outer periphery of the male buckle 17, forming a mechanical interlock. At this time, the flexible straps 14 on the left and right sides are connected into a closed loop through the quick-release connector 16, and naturally form an "X" shaped cross binding network due to the staggered arrangement of the upper and lower sliding blocks 4, applying multi-directional constraint force to the entire stack of bagged rice. Throughout the process, the guide groove 3 is always covered by the sliding block 4. Its dovetail cross-section structure ensures that the sliding block 4 can only slide axially and cannot be dislodged vertically. The reinforcing ribs inside the mounting base 1 are connected to the back of the guide groove 3, effectively resisting the reaction force generated when the flexible strap 14 is tensioned, and preventing the mounting base 1 from undergoing plastic deformation. All components do not protrude from the inner cavity of the carriage, and the cargo space is completely preserved. When the transportation task is completed, the operator presses the anti-accidental contact unlock button on the male buckle 17 and the female buckle 18 to make the elastic claw 25 retract and disengage from the annular groove, quickly disconnecting the connection. Then, the inner rod 7 and the sliding block 4 are retracted in sequence to the non-working area, and the device returns to its initial state, which is convenient for the next loading operation.

[0022] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An embedded cargo securing device for a vehicle compartment, characterized in that: The system includes an embedded base (1) installed inside the side wall (2) of the carriage, the embedded base (1) extending longitudinally along the carriage and embedded in the interlayer of the side wall (2); the inner side of the embedded base (1) is provided with several spaced guide grooves (3), each guide groove (3) having a dovetail-shaped cross-section; a sliding block (4) is slidably fitted inside the guide groove (3); a telescopic adjustment rod (5) is connected to the outer end face of the sliding block (4); the telescopic adjustment rod (5) includes an outer tube (6) and an inner rod (7), one end of the outer tube (6) being fixedly connected to... The sliding block (4) has one end of the inner rod (7) inserted into the outer tube (6) and locked in length by engaging with multiple axially arranged positioning holes (9) on the outer tube (6) through the limiting pin (8); the other end of the inner rod (7) is connected to a universal joint (10); the universal joint (10) is connected to one end of the flexible strap (14) through a ball joint; the other end of the flexible strap (14) is connected to a quick-release connector (16), which includes a male buckle (17) and a female buckle (18), respectively located at the ends of adjacent flexible straps (14).

2. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The upper and lower edges of the mounting base (1) are respectively provided with connecting flanges (19), and bolt through holes (20) are provided on the connecting flanges (19). The mounting base (1) is fixed to the interior of the side wall (2) structure of the carriage by high-strength bolts.

3. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The bottom of the guide groove (3) is provided with a magnetic strip (21), and the bottom of the sliding block (4) is provided with a permanent magnet (22). The permanent magnet (22) and the magnetic strip (21) attract each other.

4. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The universal joint (10) includes a ball head seat (11) and a ball head pin (12). The ball head seat (11) is fixed to the end of the inner rod (7). One end of the ball head pin (12) is a spherical structure and is embedded inside the ball head seat (11). The other end is fixedly connected to the flexible strap (14). An annular pressure cap (13) is provided at the opening of the ball head seat (11). The annular pressure cap (13) is screwed onto the outer circumference of the ball head seat (11) by threads.

5. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The flexible strap (14) is provided with an adjustment buckle (23) in the middle. The adjustment buckle (23) is made of metal and its inner hole is elliptical. The flexible strap (14) can be pulled along the length direction after passing through the adjustment buckle (23).

6. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The male buckle (17) of the quick-release connector (16) is provided with a tapered guide head (24) at its end, and the female buckle (18) is provided with an elastic claw (25) inside. When the male buckle (17) is inserted into the female buckle (18), the tapered guide head (24) pushes the elastic claw (25) to expand outward. After the male buckle (17) is fully inserted, the elastic claw (25) rebounds and locks into the annular groove on the outer periphery of the male buckle (17). The outer surfaces of the male buckle (17) and the female buckle (18) are provided with anti-accidental touch unlocking buttons. Pressing the unlocking button causes the elastic claw (25) to retract to release the interlock.

7. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The mounting base (1) has two rows of guide grooves (3) arranged along the height direction in the side wall (2) of the carriage. The upper and lower rows of guide grooves (3) are staggered, and the distance between each row of guide grooves (3) is 300mm to 500mm.

8. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The inner wall of the outer tube (6) is provided with a spiral guide groove, and the outer periphery of the inner rod (7) is provided with a protruding ridge that meshes with the spiral guide groove; the limiting pin (8) passes through the side wall of the outer tube (6) and is inserted into the positioning hole (9) on the inner rod (7). The positioning holes (9) are equidistantly distributed along the axial direction of the inner rod (7), and the distance between adjacent positioning holes (9) is 20mm.

9. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The flexible strap (14) has a width of 40mm to 80mm and a thickness of 2mm to 4mm, and its edges are heat-sealed. The surface of the flexible strap (14) is provided with an anti-slip texture (15), which is a continuous wave-shaped protrusion with a protrusion height of 0.3mm to 0.6mm.

10. The embedded cargo securing device for a carriage according to claim 1, characterized in that: The mounting base (1) is made of aluminum alloy extrusion molding and has a reinforcing rib structure inside. The reinforcing rib extends longitudinally and is connected to the back of the guide groove (3).

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