Combined locking device

Abstract

The utility model discloses a combined locking device, and belongs to the field of locking devices. The combined locking device comprises a locking pin and a main body structure, the main body structure comprises a U-shaped plate, an L-shaped plate and a vehicle body welding plate fixedly arranged between the U-shaped plate and the L-shaped plate, and the L-shaped plate and the vehicle body welding plate jointly define an opening space. The opening direction of the U-shaped plate is perpendicular to the opening direction of an opening space formed by the L-shaped plate and the vehicle body welding plate, a channel steel welding plate is arranged between two side plates of the U-shaped plate, through holes are formed in the corresponding positions of the two side plates of the U-shaped plate, the channel steel welding plate and the vehicle body welding plate, and the locking pin penetrates through the through holes to conduct locking. The device is convenient to use, the locking effect is excellent, the locking mode is flexible, and effective locking can be achieved.

Description

Technical Field

[0001] The utility model belongs to the field of locking devices and relates to a combined locking device. Background Art

[0002] At present, a locking device has been processed for the locking cylinder and ballast discharge rubber rod of the ballast discharge device. The locking device uses steel plates cut to corresponding sizes and punched with holes. One of the two punched iron plates is welded to the vehicle body, and the other is welded to the channel steel of the ballast discharge device. A pin is inserted and an iron chain is welded to the other end of the pin. The pin needs to be removed when the ballast discharge device is working. When the ballast discharge device is not working, in order to avoid the ballast discharge device falling off when the vehicle is driving normally, the pin needs to be inserted into the holes of the two iron plates to achieve a locking effect to prevent it from falling off and causing driving safety risks.

[0003] This locking device exhibits several significant limitations in practical application. Specifically, the pin, as the primary connection and locking component, is subject to complex and variable dynamic loads between the vehicle body and the ballast discharge channel during vehicle operation, including up-and-down pitching and side-to-side swaying. These forces exert significant shearing effects on the pin, which can easily lead to fatigue fracture over time, threatening the safety of the entire ballast discharge system and, ultimately, the vehicle's operational safety. Secondly, the design's single locking mechanism—relying solely on the pin's through-connection—failed to fully account for the potential for the ballast discharge system to sink due to its own weight and vibration during operation. Over time, this sinking tendency can cause the pin to shift relative to the center of the through-holes in the vehicle body and channel, significantly reducing the stability and reliability of the locking mechanism and increasing the risk of the ballast discharge system accidentally falling off. Furthermore, for ease of operation, the current locking mechanism requires the installation of a nut after installing the pin. This process is not only cumbersome but also significantly increases operation time and difficulty in emergency situations or in applications requiring frequent unlocking and locking, hindering rapid response and efficient maintenance.

[0004] To sum up, the existing locking device has key design problems such as shear force easily causing pin breakage, locking effect weakened due to device sinking, and inconvenient installation and disassembly. It is urgent to improve the locking performance through technological innovation and structural optimization to ensure the stability and safety of the ballast removal device during vehicle operation. Utility Model Content

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a combined locking device, which is easy to use, has an excellent locking effect, and can be used in a flexible locking manner to effectively lock.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] The utility model provides a combined locking device, comprising a locking pin and a main body structure, wherein the main body structure comprises a U-shaped plate and an L-shaped plate, and a vehicle body welding plate fixedly arranged between the U-shaped plate and the L-shaped plate, the L-shaped plate and the vehicle body welding plate jointly enclose an open space, the opening direction of the U-shaped plate is perpendicular to the opening direction of the open space formed by the L-shaped plate and the vehicle body welding plate, a channel steel welding plate is arranged between the two side plates of the U-shaped plate, through holes are opened at corresponding positions of the two side plates of the U-shaped plate, the channel steel welding plate and the vehicle body welding plate, and the locking pin passes through the through holes to lock.

[0008] In one embodiment, the U-shaped plate includes two side plates and a horizontal plate between the two side plates.

[0009] In one embodiment, when the combined locking device is in a locked state, the channel steel welding plate and the vehicle body welding plate are perpendicular to each other.

[0010] In one embodiment, when the combined locking device is in a locked state, the locking pin sequentially penetrates through holes opened at corresponding positions on the vehicle body welding plate, one side plate of the U-shaped plate, the channel steel welding plate, and the other side plate of the U-shaped plate.

[0011] In one embodiment, a pin seat is fixedly provided on the outer side of the L-shaped plate.

[0012] In one embodiment, the L-shaped plate includes a first plate and a second plate that are perpendicular to each other. The pin seat is fixedly arranged on the outer side of the second plate of the L-shaped plate.

[0013] In one embodiment, the extension direction of the vehicle body welding plate is parallel to the first plate of the L-shaped plate.

[0014] In one embodiment, a circular hole is formed on the first plate of the L-shaped plate, and a notch is formed on a portion of the circular hole adjacent to an edge of the first plate of the L-shaped plate.

[0015] In one embodiment, the locking pin includes a cylindrical pin body and a handle, one end of the cylindrical pin body is fixedly connected to the handle. When the combination locking device is in a locked state, the handle is located in the open space between the L-shaped plate and the vehicle body welding plate.

[0016] In one embodiment, the locking pin further includes a limiting device, the diameter of the limiting device is larger than the diameter of the through hole, one side of the limiting device is fixedly connected to the cylindrical pin body, and the other side of the limiting device is fixedly connected to the handle.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The utility model provides a combined locking device in which a pin sequentially penetrates a multi-layer structure (body welded plate, U-shaped plate, and channel steel welded plate). This design distributes the shear force exerted on the pin across the multiple layers of material, reducing the shear stress at a single stress point and minimizing the risk of pin fatigue fracture. The fixed connection between the U-shaped and L-shaped plates and the body welded plate, as well as the placement of the channel steel welded plates on either side of the U-shaped plate, together form a stable framework, enhancing the strength and rigidity of the overall structure and further improving the pin's load-bearing capacity. The stacking and tight fit of the multi-layer structure effectively limits the vertical sinking of the ballast removal device. Even if the device tends to sink due to its own weight or vibration during operation, the support of the multi-layer structure effectively prevents the pin from shifting relative to the center of the through-hole. The tight fit between the pin and the multi-layer structure, as well as the precise positioning of the through-hole, ensures stable and reliable locking. Even during prolonged operation, the locked state remains stable, reducing the risk of the ballast removal device accidentally falling off.

[0019] Furthermore, this device eliminates the need for additional fasteners such as nuts; a pin is inserted directly through the through-hole to achieve locking. This design simplifies installation, reducing operational difficulty and time. In emergency situations or applications requiring frequent unlocking / locking, this device can quickly complete the locking or unlocking operation, reducing delays caused by cumbersome operations. The simple structural design facilitates routine maintenance and inspection, reducing maintenance costs. It also facilitates replacement or upgrades of the locking device.

[0020] This device not only improves the bearing capacity and locking stability of the pin, but also simplifies the installation steps, improves the operational convenience and response speed, and provides a strong guarantee for the safe operation of the ballast removal device and even the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the combined locking device of the present invention in a locked state;

[0022] Figure 2 This is a left side view of the combined locking device of the present invention in a locked state;

[0023] Figure 3 It is a top view of the combined locking device of the present invention in a locked state;

[0024] Figure 4 The middle figures (a-b) are the front and side views of the channel steel welded plates of the combined locking device of the present invention;

[0025] Figure 5 The middle figures (a-c) are the front view, side view and top view of the locking pin of the combined locking device of the present invention;

[0026] Figure 6 Figures (a-b) are top and front views of the U-shaped plate of the combination locking device of the present invention; Figures (c-d) are top and front views of the L-shaped plate of the combination locking device of the present invention;

[0027] Figure 7 This is a schematic diagram of the main structure formed by the U-shaped plate, L-shaped plate and vehicle body welding plate of the combined locking device of the utility model.

[0028] Among them: 1-locking pin; 2-channel steel welding plate; 3-car body welding plate; 4-pin seat; 5-U-shaped plate; 6-L-shaped plate; 7-horizontal plate; 8-first plate; 9-second plate. DETAILED DESCRIPTION

[0029] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The utility model provides a combined locking device, comprising a locking pin 1, a pin seat 4 and a main body structure, the main body structure comprising a U-shaped plate 5 and an L-shaped plate 6, and a vehicle body welding plate 3 fixedly arranged between the U-shaped plate 5 and the L-shaped plate 6, the opening direction of the U-shaped plate 5 is perpendicular to the opening direction of the opening space formed by the L-shaped plate 6 and the vehicle body welding plate 3, the pin seat 4 is fixedly arranged on the outer surface of the L-shaped plate 6, through holes are opened at corresponding positions on the two side plates of the U-shaped plate 5 and the vehicle body welding plate 3, the locking pin 1 passes through the through holes for locking, a channel steel welding plate 2 is arranged between the two side plates of the U-shaped plate 5, and when the combined locking device is in a locked state, the channel steel welding plate 2 and the vehicle body welding plate 3 are perpendicular to each other.

[0032] The present invention is described in further detail below with reference to the accompanying drawings:

[0033] See also Figures 1 to 3 The present invention provides a combination locking device, which mainly includes a locking pin 1, a channel steel welding plate 2, a vehicle body welding plate 3, a pin seat 4 and a main structure. The main structure is further divided into a U-shaped plate 5 and an L-shaped plate 6.

[0034] like Figure 6 and Figure 7 As shown, the U-shaped plate 5 includes two side plates and a horizontal plate 7 located between the two side plates, and the L-shaped plate 6 includes a first plate 8 and a second plate 9 that are perpendicular to each other.

[0035] Specifically, the channel steel welding plate 2 is arranged in the gap between the two side plates of the U-shaped plate 5; one side of the vehicle body welding plate 3 is fastened to one side plate of the U-shaped plate 5, and the other side is fixedly connected to the second plate 9 of the L-shaped plate 6. Figure 3 and Figure 7 As shown, specifically, the vehicle body welding plate 3 is tightly attached to and fixedly connected to the side plate surface of the U-shaped plate 5 , and the edge of the vehicle body welding plate 3 is fixedly connected to the edge of the second plate 9 of the L-shaped plate 6 .

[0036] The extension direction of the body welding plate 3 remains parallel to the first plate 8 of the L-shaped plate 6. The channel steel welding plate 2 and the body welding plate 3 are perpendicular to each other. The opening direction of the U-shaped plate 5 is perpendicular to the opening direction of the open space enclosed by the L-shaped plate 6 and the body welding plate 3.

[0037] The pin holder 4 is mounted on the outer surface of the second plate 9 of the L-shaped plate 6 .

[0038] In addition, a circular hole is provided on the first plate 8 of the L-shaped plate 6, and the two side plates of the U-shaped plate 5 and the channel steel welded plate 2 ( Figure 4 ), corresponding through holes are provided on the vehicle body welding plate 3.

[0039] The locking pin 1 passes through corresponding through holes preset on the vehicle body welding plate 3 , one side plate of the U-shaped plate 5 , the channel steel welding plate 2 , and the other side plate of the U-shaped plate 5 in sequence.

[0040] In one embodiment, the locking pin 1 includes a cylindrical pin body and a handle. One end of the cylindrical pin body is fixedly connected to the handle. The handle is L-shaped and is located in the open space between the L-shaped plate 6 and the vehicle body welding plate 3.

[0041] In another way, Figure 5 As shown, the locking pin 1 consists of a cylindrical pin body, a stopper, and a handle. One end of the stopper is securely connected to the cylindrical pin body, while the other end is fixedly connected to the handle. The stopper is a cylinder with a diameter slightly larger than the diameter of the through hole, and the center of the stopper coincides with the center of the cylindrical pin body.

[0042] The cylindrical pins sequentially pass through corresponding through-holes in the body weld plate 3, one side plate of the U-shaped plate 5, the channel steel weld plate 2, and the other side plate of the U-shaped plate 5. The stopper and handle are located together in the space defined by the L-shaped plate 6 and the body weld plate 3, and the diameter of the stopper is designed to be larger than the diameter of the through-hole.

[0043] In one embodiment, the outer edge of the circular hole intersects with the edge line of the first plate 8 of the L-shaped plate 6 ; a notch is provided at the intersection of the outer edge of the circular hole and the edge line of the first plate 8 of the L-shaped plate 6 .

[0044] In another embodiment, the circular hole is opened at the center of the first plate 8 of the L-shaped plate 6 , and a gap is opened between the circular hole and an edge line of the first plate 8 .

[0045] The notch facilitates the insertion and removal of the locking pin 1 and is easy to operate.

[0046] Through-holes are located at the center of each side plate of the U-shaped plate 5. The through-holes in the channel-welded plate 2 are located near the horizontal plate 7 of the U-shaped plate 5, while the through-holes in the body-welded plate 3 are located adjacent to the second plate 9 of the L-shaped plate 6. The centers of these through-holes—including those in the side plates of the U-shaped plate 5, the channel-welded plate 2, and the body-welded plate 3—are aligned.

[0047] The above-mentioned device, through the combination of the U-shaped plate 5, the L-shaped plate 6, the channel steel welded plate 2, the vehicle body welded plate 3, and the pin holder 4, forms a compact and easy-to-operate locking device. The locking pin 1 can quickly penetrate the through-holes in multiple components, enabling rapid locking and unlocking. The locking pin 1 simultaneously penetrates multiple components (the vehicle body welded plate 3, the side plates of the U-shaped plate 5, and the channel steel welded plate 2), forming a multi-point lock, greatly improving the reliability and safety of the lock. The pin holder 4 provides a placement space for the removed locking pin 1. Due to the more stable and flexible locking method, the risk of the ballast removal device falling off during vehicle operation is effectively avoided, thereby improving driving safety.

[0048] When the ballast removal device needs to be locked, the locking pin is inserted from the circular hole on the first plate 8 of the L-shaped plate 6, and then passes through the through holes at the corresponding positions on the vehicle body welding plate 3, one side plate of the U-shaped plate 5, the channel steel welding plate 2, and the other side plate of the U-shaped plate 5, until the locking pin 1 is fully in place. When it is necessary to unlock, the locking pin 1 can be simply pulled out of the through hole and then placed in the pin seat 4, which is simple and quick to operate.

[0049] In summary, the above-mentioned combined locking device has a simplified structure, stable locking, flexible locking methods, convenient operation and strong applicability.

[0050] Example 1

[0051] The present embodiment provides a combined locking device, including a locking pin 1, a pin seat 4 and a main body structure, wherein the main body structure includes a U-shaped plate 5 and an L-shaped plate 6, the U-shaped plate 5 includes two side plates and a horizontal plate 7 between the two side plates, the L-shaped plate 6 includes a first plate 8 and a second plate 9 perpendicular to each other, a vehicle body welding plate 3 is fixedly connected between one side plate of the U-shaped plate 5 and the second plate 9 of the L-shaped plate 6, the extension direction of the vehicle body welding plate 3 is parallel to the first plate 8 of the L-shaped plate 6, the opening direction of the U-shaped plate 5 is perpendicular to the opening direction of the space formed by the L-shaped plate 6 and the vehicle body welding plate 3, the pin seat 4 is fixedly arranged on the outer surface of the second plate 9 of the L-shaped plate 6, a channel steel welding plate 2 is provided between the two side plates of the U-shaped plate 5, and a circular hole is opened on the first plate 8 of the L-shaped plate 6. When the combined locking device is in a locked state, the locking pin 1 passes through the through holes opened at corresponding positions on the vehicle body welding plate 3, one side plate of the U-shaped plate 5, the channel steel welding plate 2 and the other side plate of the U-shaped plate 5 in sequence. The through holes on the two side plates of the U-shaped plate 5 are located at the center of the two side plates, the through holes on the channel steel welded plate 2 are opened close to the horizontal plate 7 of the U-shaped plate 5, and the through holes on the body welded plate 3 are opened close to the second plate 9 of the L-shaped plate 6; the through holes on the two side plates of the U-shaped plate 5, the through holes on the channel steel welded plate 2 and the through holes on the body welded plate 3 are aligned in center.

[0052] One side of the vehicle body welding plate 3 is tightly attached to and fixedly connected to the side surface of the U-shaped plate 5 , and the edge of the vehicle body welding plate 3 is fixedly connected to the inner edge of the second plate 9 of the L-shaped plate 6 .

[0053] The locking pin 1 includes a cylindrical pin body and a handle, and one end of the cylindrical pin body is fixedly connected to the handle.

[0054] When the combined locking device is in a locked state, the handle is located in the space between the L-shaped plate 6 and the vehicle body welding plate 3 .

[0055] The locking pin 1 further comprises a limiting device, one side of which is fixedly connected to the cylindrical pin body, and the other side of which is fixedly connected to the handle. The diameter of the limiting device is larger than the diameter of the through hole.

[0056] The outer edge of the circular hole intersects with the edge line of the first plate 8 of the L-shaped plate 6; a notch is formed at the intersection of the outer edge of the circular hole and the edge line of the first plate 8 of the L-shaped plate 6.

[0057] The circular hole is opened at the center of the first plate 8 of the L-shaped plate 6 , and a gap is opened between the circular hole and an edge line of the first plate 8 .

[0058] When the combined locking device is in a locked state, the channel steel welding plate 2 and the vehicle body welding plate 3 are perpendicular to each other.

[0059] Example 2

[0060] This embodiment provides a combined locking device, which is composed of a U-shaped plate 5, an L-shaped plate 6 and a pin. The fixed connection in the following content is welding.

[0061] The aforementioned combined locking device comprises a locking pin 1, a channel steel welded plate 2, a pin holder 4, and a main structure. The main structure comprises a U-shaped plate 5, a vehicle body welded plate 3, and an L-shaped plate 6. The U-shaped plate 5 is designed with two side plates and a horizontal plate 7 connecting them. The L-shaped plate 6 is composed of a first plate 8 and a second plate 9 that are perpendicular to each other.

[0062] In this device, the channel steel welding plate 2 is placed between the two side plates of the U-shaped plate 5. One side of the car body welding plate 3 is tightly attached and fixedly connected to one side plate of the U-shaped plate 5, and the other side is connected to the second plate 9 of the L-shaped plate 6.

[0063] In particular, the vehicle body welding plate 3 is not only tightly and fixedly connected to the side plate surface of the U-shaped plate 5 , but its edge is also tightly and fixedly connected to the edge of the second plate 9 of the L-shaped plate 6 .

[0064] The extension direction of the body welding plate 3 is parallel to the first plate 8 of the L-shaped plate 6, and the channel steel welding plate 2 is perpendicular to the body welding plate 3. The opening direction of the U-shaped plate 5 is perpendicular to the opening direction of the space enclosed by the L-shaped plate 6 and the body welding plate 3.

[0065] The pin seat 4 is fixedly arranged on the outer surface of the second plate 9 of the L-shaped plate 6 .

[0066] A circular hole is designed on the first plate 8 of the L-shaped plate 6, and corresponding through holes are opened on the two side plates of the U-shaped plate 5, the channel steel welding plate 2 and the vehicle body welding plate 3, and the through holes are used for the locking pin 1 to pass through.

[0067] The locking pin 1 consists of a cylindrical pin body, a stopper, and a handle. The stopper is securely connected to the cylindrical pin body and handle at both ends. When locked, the cylindrical pin body passes through corresponding holes in the body weld plate 3, one side of the U-shaped plate 5, the channel steel weld plate 2, and the other side of the U-shaped plate 5. The stopper and handle are located within the space defined by the L-shaped plate 6 and the body weld plate 3. The diameter of the stopper is larger than the diameter of the through-hole to ensure locking.

[0068] In addition, there are two ways to design the circular hole on the first plate 8 of the L-shaped plate 6: one is that the outer edge of the circular hole intersects with the edge line of the first plate 8 of the L-shaped plate 6, and a gap is opened at the intersection; the other is that the circular hole is opened in the center position of the first plate 8 of the L-shaped plate 6, and a gap is opened between the circular hole and an edge line of the first plate 8.

[0069] Furthermore, the through-holes on both side panels of the U-shaped plate 5 are located at their respective centers. The through-holes on the channel steel welded plate 2 are located near the horizontal plate 7 of the U-shaped plate 5, and the through-holes on the body welded plate 3 are located near the second plate 9 of the L-shaped plate 6. The centers of all through-holes are precisely aligned, ensuring that the locking pin 1 can pass through smoothly and stably.

[0070] Based on the above embodiments, a method for manufacturing and using a combination locking device is provided.

[0071] Step 1: Material preparation. For the sheet material used below, select a steel plate with a thickness of 10 mm and cut it using a shearing machine.

[0072] A rectangular plate with a length of 140mm and a width of 50mm is punched with a hole with a diameter of 25mm at one end, which is the body welding plate 3. A rectangular plate with a length of 110mm and a width of 50mm is bent into an L shape at 70mm of the plate, as shown in the top view of the L shape in Figure 6 below, and a circular hole with a diameter of 40mm is punched on one side of the L-shaped plate 6, with one end of the hole open, as shown in Figure 6 below. Figure 6The left side view of the L-shaped plate in the figure. A rectangular plate with a length of 230mm and a width of 50mm is bent into a U shape as shown below. Figure 6 As shown in the top view of the middle U-shaped plate 5, the two sides are 60mm and the middle part is 50mm. A through hole with a diameter of 25mm is punched at the center point of the 60mm plate on both sides, as shown below Figure 6 Left view of the middle U-shaped plate 5. A rectangular plate with a length of 170mm and a width of 20mm and a hole with a diameter of 25mm at one end, which is a channel steel welded plate 2, as shown in the figure below Figure 4 Use a lathe pin to take a cylindrical pin with a length of 100mm and a diameter of 20mm at one end and 30mm at the other end. Also, take a steel bar with a diameter of 2mm, take a length of 130mm and bend it at 100mm as a handle. Weld the 30mm end to the pin with a diameter of 30mm to make a locking pin 1. Figure 5 As shown, prepare the electric welding machine to use the layout of the above device for welding.

[0073] Step 2: Insert the locking pin 1 to lock. The locking pin 1 is inserted through the circular hole on the first plate 8 of the L-shaped plate 6. The cylindrical pin body passes through the corresponding through holes preset on the vehicle body welding plate 3, one side plate of the U-shaped plate 5, the channel steel welding plate 2, and the other side plate of the U-shaped plate 5 in turn to lock.

[0074] Step 3: Pull out the locking pin 1 to unlock, pull out the cylindrical pin body, pull out the locking pin 1 through the circular hole on the first plate 8 of the L-shaped plate 6 to unlock, and place the locking pin 1 in the pin seat 4.

[0075] The above-mentioned combined locking device adopts U-shaped structure and L-shaped structure connection, which has a simple structure and is easy to use. The chain connecting pin is eliminated, and the pin seat 4 is welded to prevent the risk of chain disconnection. In addition, the thickness of the plate is thickened to 10mm, and the locking device is more secure. The above-mentioned locking device has a mature structure and can be used on a variety of equipment to achieve a locking effect.

[0076] After the improved installation of the device provided in the above embodiment was completed, it was applied well on site and achieved the expected effect. After the ballast removal operation test, the locking device operation achieved the expected effect after adopting the new locking device. The locking device has a simple structure, and locking and unlocking are convenient and quick, which improves work efficiency, reduces the labor intensity of personnel, is safe and reliable, and is suitable for use in different equipment.

[0077] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A combination locking device, characterized in that: The invention comprises a locking pin (1) and a main structure, wherein the main structure comprises a U-shaped plate (5) and an L-shaped plate (6), and a vehicle body welding plate (3) fixedly arranged between the U-shaped plate (5) and the L-shaped plate (6), wherein the L-shaped plate (6) and the vehicle body welding plate (3) jointly enclose an open space, wherein the opening direction of the U-shaped plate (5) is perpendicular to the opening direction of the open space formed by the L-shaped plate (6) and the vehicle body welding plate (3), a channel steel welding plate (2) is arranged between the two side plates of the U-shaped plate (5), and through holes are opened at corresponding positions on the two side plates of the U-shaped plate (5), the channel steel welding plate (2) and the vehicle body welding plate (3), and the locking pin (1) passes through the through holes for locking.

2. The combination locking device according to claim 1, characterized in that: The U-shaped plate (5) comprises two side plates and a horizontal plate (7) between the two side plates.

3. The combination locking device according to claim 1, wherein: When the combined locking device is in a locked state, the channel steel welding plate (2) and the vehicle body welding plate (3) are perpendicular to each other.

4. The combination locking device according to claim 1, wherein: When the combined locking device is in a locked state, the locking pin (1) sequentially penetrates through holes provided at corresponding positions on the vehicle body welding plate (3), one side plate of the U-shaped plate (5), the channel steel welding plate (2), and the other side plate of the U-shaped plate (5).

5. The combination locking device according to claim 1, wherein: A pin seat (4) is fixedly provided on the outer side surface of the L-shaped plate (6).

6. The combination locking device according to claim 1, wherein: The L-shaped plate (6) comprises a first plate (8) and a second plate (9) which are perpendicular to each other.

7. The combination locking device according to claim 6, characterized in that: The extension direction of the vehicle body welding plate (3) is parallel to the first plate (8) of the L-shaped plate (6).

8. The combination locking device according to claim 6, wherein: A circular hole is provided on the first plate (8) of the L-shaped plate (6), and a notch is provided at a portion of the circular hole close to the edge of the first plate (8) of the L-shaped plate (6).

9. The combination locking device according to claim 1, wherein: The locking pin (1) comprises a cylindrical pin body and a handle, and one end of the cylindrical pin body is fixedly connected to the handle.

10. The combination locking device according to claim 9, wherein: The locking pin (1) further comprises a limiting device, the diameter of the limiting device being larger than the diameter of the through hole, one side of the limiting device being fixedly connected to the cylindrical pin body, and the other side of the limiting device being fixedly connected to the handle.

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