Connecting device and connecting method for carriage and frame of truck

Abstract

The invention discloses a connecting device and method for a carriage and a frame of a truck, and belongs to the field of carriage installation. According to the specific scheme, the connecting device for the carriage and the frame of the truck comprises two screws oppositely arranged on the two sides of a longitudinal beam of a bottom plate and further comprises a fixing base used for being placed in the longitudinal beam of the bottom plate, and the fixing base is a rectangular body; a first connecting unit is installed on the side face of one side of the fixing base and connected with one screw, the upper end of the other screw is connected with a second connecting unit, and the second connecting unit is detachably connected with the fixing base through a bolt. The second connecting unit and the fixing base are oppositely arranged on the two sides of the bottom plate longitudinal beam web, the lower ends of the two screws are connected through a pressing plate, and the lower ends of the screws are in threaded connection with second nuts. Through the arrangement of the built-in fixing base and the connecting unit, the device is suitable for a carriage of a truck with a cross beam disconnected structure, an auxiliary structure does not need to be welded to the bottom plate longitudinal beam, damage to the bottom plate longitudinal beam is reduced, and adjustment can be conducted according to requirements.

Description

Technical Field

[0001] This invention relates to the field of vehicle body installation technology, and in particular to a connection device and method for connecting a cargo truck body to a vehicle frame. Background Technology

[0002] To achieve lightweight design of the cargo box, both the longitudinal beams and transverse beams of the floor are designed with a channel-shaped structure. The cargo box is divided into two structures based on the arrangement of the transverse beams: one is a through-beam type (e.g., ...). Figure 1 As shown), the bottom plate crossbeam is arranged on the upper part of the bottom plate longitudinal beam, and the bottom plate body is fixed on the upper part of the bottom plate crossbeam; another type is the crossbeam split type, where the bottom plate crossbeam is arranged on both sides and in the middle of the bottom plate longitudinal beam, the upper flange of the bottom plate crossbeam is flush with the upper flange of the bottom plate longitudinal beam, and the bottom plate body is directly fixed on the upper part of the bottom plate longitudinal beam and crossbeam.

[0003] The cargo box and frame of a truck are generally connected by U-bolts. The cargo box with a through-beam structure has a space between the floor body and the longitudinal beams of the floor. The advantage is that it is convenient to install and tighten the U-bolts of the cargo box. The disadvantage is that the cargo platform height (the cargo platform height refers to the height of the cargo box floor from the ground) is large. On the other hand, the cargo box with a split-beam structure can significantly reduce the cargo platform height.

[0004] Because the cargo truck body has a split-beam structure, the upper flange of the floor crossbeam is flush with the upper flange of the floor longitudinal beam, and the floor body is directly fixed to the upper part of the floor longitudinal beam and crossbeam. There is no operating space between the floor body and the floor longitudinal beam, so the existing U-bolts cannot be directly installed and used. It is necessary to weld auxiliary structures onto the floor longitudinal beam to assist in the installation of the U-bolts. However, in order to prevent damage to the painted surface of the floor longitudinal beam, the auxiliary structures are all welded onto the floor longitudinal beam before the cargo body is painted. This makes it impossible to adjust the position of the U-bolts. When the position of the chassis accessories changes, the U-bolts are prone to interference with the accessories. Summary of the Invention

[0005] To address the limitation of the crossbeam-disconnectable truck body structure mentioned above, where existing U-bolts cannot be directly used to connect the crossbeam-disconnectable truck body to the frame and auxiliary structures need to be welded onto the longitudinal beams of the floor plate, this invention provides a connection device and method for connecting the truck body to the frame.

[0006] The technical solution of this invention is as follows: The present invention provides a connection device between the cargo box and the frame of a truck, including two screws arranged opposite to each other on both sides of the longitudinal beam of the bottom plate, and a fixing seat for placing in the longitudinal beam of the bottom plate. The fixing seat is rectangular, which facilitates stable placement in the longitudinal beam of the bottom plate and provides an installation base for the screws, so that the screws can be set vertically. A first connecting unit is installed on one side of the fixed seat. The first connecting unit is connected to a screw rod, and the upper end of another screw rod is connected to a second connecting unit. The second connecting unit is detachably connected to the bottom plate longitudinal beam and the fixed seat by bolts. The second connecting unit and the fixed seat are arranged opposite to each other on both sides of the web of the bottom plate longitudinal beam. The lower ends of the two screw rods are connected by a pressure plate, and the lower ends of the screw rods are threaded with a second nut to abut the upper surface of the pressure plate against the lower surface of the frame longitudinal beam. The built-in fixed seat is suitable for cargo truck bodies with a crossbeam split structure. There is no need to weld auxiliary structures on the bottom plate longitudinal beam. During the installation process, only corresponding bolt holes need to be drilled. This not only minimizes damage to the paint of the bottom plate longitudinal beam, but also allows for adjustment of the position of the connecting device according to different chassis configurations, avoiding interference between the connecting device and chassis accessories, thereby improving the versatility of the cargo box.

[0007] Preferably, the width of the mounting base is the same as the flange width of the longitudinal beam of the base plate, so that the mounting base and the inner cavity of the longitudinal beam of the base plate form a tight fit, which enhances the installation stability of the mounting base in the longitudinal beam of the base plate. At the same time, it ensures that the two screws can be symmetrically arranged on both sides of the longitudinal beam of the base plate, so that the load of the carriage can be evenly transferred to the longitudinal beam of the frame through the screws, avoiding the problem of local stress concentration caused by screw misalignment, and improving the mechanical performance of the connection structure. In addition, the symmetrical arrangement facilitates quick positioning of the screw position during installation, reduces measurement errors, improves assembly efficiency, and makes the overall structure more regular, which facilitates subsequent layout coordination with chassis accessories, further enhancing the adaptability of the carriage to different frame configurations.

[0008] Preferably, both the first connecting unit and the second connecting unit are L-shaped structures, which can achieve multi-directional connection and fixation within a limited space.

[0009] Preferably, both the first connecting unit and the second connecting unit include a vertical section and a horizontal section. The vertical section of the first connecting unit is connected to the side of the fixing seat, and the vertical section of the second connecting unit is connected to the side of the base plate longitudinal beam. The horizontal sections of both the first connecting unit and the second connecting unit are connected to the screw. The connection between the vertical section and the side allows the connecting unit to fit more closely to the structure of the fixing seat and the base plate longitudinal beam, enhancing the tightness of the connection. The connection between the horizontal section and the screw ensures the vertical installation accuracy of the screw and facilitates the connection and fixation of the lower end of the screw to the pressure plate and the frame longitudinal beam.

[0010] Preferably, the first connecting unit is detachably connected to the fixing seat by bolts, which facilitates the assembly and disassembly of the first connecting unit and the fixing seat.

[0011] Preferably, the first connecting unit is fixedly connected to the fixed base. The installation process of the first connecting unit eliminates the use of bolts, which simplifies the on-site operation. The installation of the first connecting unit is no longer limited by the narrow space inside the longitudinal beam of the base plate and the obstruction of sight. It is only necessary to place the fixed base and the first connecting unit as a whole inside the longitudinal beam of the base plate and adjust them, which facilitates the installation of the first connecting unit.

[0012] Preferably, the fixing base has a connecting hole, and a first nut is fixed on the inner wall of the fixing base. The first nut is coaxially arranged with the connecting hole and is used to connect with the bolt, so that the bolt can accurately pass through the connecting hole and connect with the first nut, thereby improving the installation efficiency.

[0013] Preferably, a reinforcing plate is fixed inside the fixing base, which can effectively improve the structural strength and rigidity of the fixing base.

[0014] This invention provides a method for connecting the cargo box and the frame of a freight truck, comprising: The first connecting unit is connected to the side of the fixed base and a screw respectively. The connection between the first connecting unit and the fixed base and the screw is completed in advance. Pre-assembly can be carried out before installation, which reduces the workload and time of on-site installation, improves installation efficiency, and reduces the impact of the small operating space and poor line of sight inside the chassis on the installation of the first connecting unit and screw. Bolt holes are made at designated locations on the web of the bottom plate longitudinal beam, eliminating the need for complex welding operations. This minimizes structural damage to the bottom plate longitudinal beam, maintaining its integrity and original strength. It also allows for flexible adjustment of the bolt hole positions according to different chassis configurations and installation requirements, improving the versatility and adaptability of the connection device. The fixing seat is placed in the inner cavity of the bottom plate longitudinal beam, so that the side of the fixing seat away from the first connecting unit is in contact with the inner side of the web of the bottom plate longitudinal beam. The second connecting unit is placed on the outer side of the bottom plate longitudinal beam. The vertical section of the second connecting unit, the web of the bottom plate longitudinal beam and the fixing seat are fixedly connected together by bolts. A screw is connected to the horizontal section of the second connecting unit. The clamping effect of the fixing seat and the second connecting unit on both sides of the web of the bottom plate longitudinal beam forms a reliable connection structure. The bolt fixing is simple to operate and the connection is firm. At the same time, it makes the installation position of the screw more accurate, which is convenient for subsequent connection with the pressure plate and the frame longitudinal beam. The pressure plate is fitted onto the lower end of the two screws, and then the lower end of each screw is connected to the corresponding threaded second nut. Tightening the second nut makes the upper surface of the pressure plate abut against the lower flange of the frame longitudinal beam, so as to tighten and fix the bottom plate longitudinal beam to the frame longitudinal beam, thereby forming a firm connection between the car body and the frame, which can effectively transfer the load.

[0015] Preferably, the vertical section of the first connecting unit is bolted to the fixed seat, which facilitates installation, use, and subsequent maintenance; Alternatively, the vertical section of the first connecting unit is fixedly connected to the fixed seat, eliminating the use of bolts and simplifying on-site operations. The installation of the first connecting unit is no longer limited by the narrow space inside the longitudinal beam of the base plate and the obstruction of sight. It is only necessary to place the fixed seat and the first connecting unit as a whole inside the longitudinal beam of the base plate and adjust them, which facilitates the installation of the first connecting unit.

[0016] As can be seen from the above technical solutions, the advantages of the present invention are: 1. The rectangular fixing seat is placed inside the longitudinal beam of the base plate to provide an installation base for the screw. With the setting of the first and second connecting units, it is suitable for cargo truck bodies with a crossbeam split structure. There is no need to weld auxiliary structures on the longitudinal beam of the base plate. During the installation process, only bolt holes need to be opened at the corresponding positions of the longitudinal beam of the base plate. This not only minimizes the damage to the paint of the longitudinal beam of the base plate, but also allows for adjustment of the position of the connecting device according to different chassis configurations, avoiding interference between the connecting device and chassis accessories, thereby improving the versatility of the cargo box.

[0017] 2. The first connecting unit is fixedly connected to the fixed base. The installation process of the first connecting unit eliminates the use of bolts, simplifying the on-site operation. The installation of the first connecting unit is no longer limited by the narrow space inside the longitudinal beam of the base plate and the obstruction of sight. It is only necessary to place the fixed base and the first connecting unit as a whole inside the longitudinal beam of the base plate and adjust it, which facilitates the installation of the first connecting unit. The second connecting unit is detachably connected to the fixed base by bolts, which facilitates the installation of subsequent components. Attached Figure Description

[0018] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram showing the connection between the cargo box and the frame of an existing through-beam type freight truck. Figure 2 This is a schematic diagram illustrating the installation and use structure of the connection device between the cargo box and the frame of a freight car according to one or more embodiments of the present invention. Figure 1 ; Figure 3 This is a schematic diagram illustrating the installation and use structure of the connection device between the cargo box and the frame of a freight car according to one or more embodiments of the present invention. Figure 2 ; Figure 4 This is a side view of the connection device between the cargo box and the frame of a freight car according to one or more embodiments of the present invention. Figure 5This is a structural schematic diagram of a welded fixing base according to one or more embodiments of the present invention; Figure 6 This is a top view of the welded fixing base according to one or more embodiments of the present invention; Figure 7 This is a schematic diagram of the structure of an integrally molded fixing base according to one or more embodiments of the present invention; Figure 8 This is a schematic diagram showing the positions of the planes of the fixing base according to one or more embodiments of the present invention; The components represented by the various reference numerals in the diagram are: 1. Base plate main body; 2. Base plate longitudinal beam; 3. Frame longitudinal beam; 4. Fixing seat; 401. First mounting plate; 402. Reinforcing plate; 403. First nut; 404. Second mounting plate; 405. Fixing seat main body; 406. First plane; 407. Second plane; 408. Third plane; 409. Fourth plane; 410. Fifth plane; 411. Connecting hole; 5. First connecting unit; 6. Second connecting unit; 7. Bolt; 8. Screw; 9. Pressure plate; 10. Second nut; 11. Vertical section; 12. Horizontal section. Detailed Implementation

[0020] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0021] Example 1 In a typical embodiment of the present invention, such as Figures 2-4 As shown, a connection device between the cargo box and the frame of a freight truck is proposed, including: a fixing seat 4, a first connecting unit 5, a second connecting unit 6, a screw 8, a pressure plate 9, and a second nut 10. The fixing seat 4 is used to be placed in the bottom plate longitudinal beam 2 (channel cross-section). The fixing seat 4 is rectangular, and the width of the fixing seat 4 is the same as the flange width of the bottom plate longitudinal beam 2. Two screws 8 are provided, both vertically arranged. A first connecting unit 5 is installed on one side of the fixing seat 4, and the upper end of one screw 8 is connected to the first connecting unit 5; the upper end of the other screw 8 is connected to a second connecting unit 6. The second connecting unit 6 is detachably connected to the bottom plate longitudinal beam 2 and the fixing seat 4 by bolts 7. The fixing seat 4 and the second connecting unit 6 are arranged opposite each other on the inner and outer sides of the web of the bottom plate longitudinal beam 2, as shown. Figure 4As shown, the second connecting unit 6 is located on the outer side of the web of the bottom plate longitudinal beam 2, and the fixing seat 4 is located on the inner side of the web of the bottom plate longitudinal beam 2. The bolt 7 passes through the second connecting unit 6 and the web of the bottom plate longitudinal beam 2 from the outside to the inside and is detachably connected to the fixing seat 4. The lower ends of the two screws 8 are connected by a pressure plate 9. At least one second nut 10 is threaded to the lower end of each screw 8 to limit the position of the pressure plate 9. Specifically, the upper surface of the pressure plate 9 abuts against the lower surface of the frame longitudinal beam 3, so that the two screws 8, together with the first connecting unit 5 and the second connecting unit 6, tighten and fix the bottom plate longitudinal beam 2 to the frame longitudinal beam 3.

[0022] In this embodiment, the screw 8 is detachably connected to the corresponding first connecting unit 5 and second connecting unit 6. Specifically, the first connecting unit 5 and the second connecting unit 6 are provided with through holes for the insertion of the screw 8. A limiting plate is fixedly installed at the upper end of the screw 8. The size of the limiting plate is larger than the size of the through hole, so that the screw 8 can be inserted into the corresponding first connecting unit 5 and second connecting unit 6 through the through hole, and the limiting plate is used to limit the screw 8.

[0023] In other embodiments, the upper end of the screw 8 can be directly and fixedly connected to the corresponding first connecting unit 5 and second connecting unit 6 by welding or other means. It is understood that the specific connection method between the screw 8 and the first connecting unit 5 and the second connecting unit 6 can be selected according to actual needs, and no further restrictions are imposed here.

[0024] Both the first connecting unit 5 and the second connecting unit 6 are L-shaped structures, that is, both the first connecting unit 5 and the second connecting unit 6 contain a vertical section 11 and a horizontal section 12. The vertical section 11 of the first connecting unit 5 is used to connect with the side of the fixed seat 4, the vertical section 11 of the second connecting unit 6 is used to connect with the side of the bottom plate longitudinal beam 2, and the horizontal section 12 of both the first connecting unit 5 and the second connecting unit 6 is used to connect with the screw 8.

[0025] The first connecting unit 5 is detachably connected to the fixing seat 4 by bolts 7. Specifically, the horizontal section 12 of the first connecting unit 5 is provided with a through hole for the installation of the screw 8, and the vertical section 11 of the first connecting unit 5 is provided with a bolt hole. The fixing seat 4 is welded and fixedly provided with a first nut 403. The bolt 7 passes through the bolt hole and is threadedly connected to the first nut 403, thereby connecting the first connecting unit 5 and the side of the fixing seat 4 together.

[0026] Similarly, the second connecting unit 6 is detachably connected to the fixing seat 4 by bolts 7. Specifically, the horizontal section 12 of the second connecting unit 6 is provided with through holes for the installation of screws 8. The vertical section 11 of the second connecting unit 6 is provided with bolt holes, and bolt holes are also provided at the corresponding positions of the web of the bottom plate longitudinal beam 2. A first nut 403 is welded inside the fixing seat 4. The bolts 7 pass through the bolt holes on the second connecting unit 6 and the bottom plate longitudinal beam 2 in sequence and are threadedly connected to the first nut 403, thereby fixing the vertical section 11 of the second connecting unit 6 to the side of the bottom plate longitudinal beam 2 together.

[0027] The fixing seat 4 is a rectangular body. Several first nuts 403 are welded and fixed on the inner wall of the fixing seat 4 for threaded connection with the bolt 7. The fixing seat 4 includes a fixing seat body 405, which is a hollow rectangular structure. Several first nuts 403 are fixed on the two opposite inner walls of the fixing seat 405 for connection with the bolt 7.

[0028] like Figure 5 and Figure 6 As shown, the fixing base 4 includes a first mounting plate 401 and a second mounting plate 404, that is, the fixing base body 405 is composed of the first mounting plate 401 and the second mounting plate 404. The first mounting plate 401 has a U-shaped structure, and the second mounting plate 404 has a flat plate structure. The second mounting plate 404 is fixedly installed at the U-shaped opening of the first mounting plate 401 by welding. The second mounting plate 404 and the first mounting plate 401 form a rectangular structure.

[0029] To improve the connection between the first mounting plate 401 and the second mounting plate 404, a bent section is provided at the U-shaped opening of the first mounting plate 401, so as to expand the contact area with the second mounting plate 404 by utilizing the bent section to increase the connection strength between the second mounting plate 404 and the first mounting plate 401. Several first nuts 403 are welded and fixed on the inner surfaces of both the first mounting plate 401 and the second mounting plate 404 for connection with bolts 7.

[0030] To further improve the overall strength of the fixing base 4, the fixing base 4 also includes a reinforcing plate 402. The reinforcing plate 402 is fixedly installed inside the fixing base body 405 by welding to fix the two sides with the first nut 403 together, thereby improving the overall strength. In this embodiment, the reinforcing plate 402 is fixedly disposed between the first mounting plate 401 and the second mounting plate 404 to improve the connection between the first mounting plate 401 and the second mounting plate 404.

[0031] The first mounting plate 401 and the second mounting plate 404 are each provided with a plurality of connecting holes 411. The connecting holes 411 penetrate through the side of the corresponding mounting plate so that the bolt 7 can be inserted into the fixing body 405. A plurality of first nuts 403 are welded and fixed on the inner wall of the first mounting plate 401 and the second mounting plate 404. The number of first nuts 403 is the same as the number of connecting holes 411 and they correspond one-to-one. The connecting holes 411 and the first nuts 403 are coaxially arranged for threaded connection with the bolt 7.

[0032] In this embodiment, two connecting holes 411 are respectively opened on the first mounting plate 401 and the second mounting plate 404, and two first nuts 403 are respectively welded and fixed on the inner walls of the first mounting plate 401 and the second mounting plate 404. It can be understood that the number of connecting holes 411 and first nuts 403 can be set according to actual needs, preferably an even number, and no further restrictions are imposed here.

[0033] To improve the overall stability of the fixed base 4, several first nuts 403 on the same side are distributed on both sides of the reinforcing plate 402 to balance the force on the fixed base 4 during use.

[0034] In other implementations, such as Figure 7 As shown, the main body 405 of the fixing seat can also be integrally formed by forging, casting, extrusion molding or other methods, which improves the production efficiency of the fixing seat 4 and also improves the overall strength of the fixing seat 4.

[0035] Understandably, the specific production method of the fixed base body 405, such as welding, forging, or casting, can be selected according to actual needs, and no further restrictions will be imposed here.

[0036] In summary, the rectangular mounting base 4 contains several planes, specifically as follows: Figure 8 As shown, the fixing base 4 includes a first plane 406, a second plane 407, a third plane 408, a fourth plane 409, and a fifth plane 410. The first plane 406 and the second plane 407 are arranged opposite to each other and are used for the installation of the first nut 403. The fifth plane 410 is fixedly disposed between the first plane 406 and the second plane 407. The third plane 408 and the fourth plane 409 are symmetrically distributed on both sides of the fifth plane 410. The fifth plane 410 is used to connect the first plane 406 and the second plane 407 to improve the connection strength between the first plane 406 and the second plane 407 and prevent deformation between the first plane 406 and the second plane 407 after the connecting device is fully installed, thereby preventing the connection device from becoming ineffective.

[0037] In practical use, the fixing seat 4 is placed inside the bottom plate longitudinal beam 2. Since the width of the fixing seat 4 is the same as the width of the flange of the bottom plate longitudinal beam 2, and the side of the fixing seat 4 is flush with the side edge of the flange, it is convenient to install the two screws 8. The first connecting unit 5 is installed on the fixing seat 4 by bolts 7 and connected to a bolt 8. The second connecting unit 6 is placed on the outside of the bottom plate longitudinal beam 2, and the second connecting unit 6 is connected to the first nut 403 on the fixing seat 4 by bolts 7. The second connecting unit 6 is also connected to another screw 8. The lower ends of the two screws 8 are connected by pressure plates 9 and threaded with second nuts 10. The position of pressure plates 9 is restricted by the second nuts 10. Specifically, the upper surface of pressure plates 9 abuts against the lower surface of the frame longitudinal beam 3, so that the two screws 8, together with the first connecting unit 5 and the second connecting unit 6, can tighten and fix the bottom plate longitudinal beam 2 to the frame longitudinal beam 3.

[0038] The overall installation of the connecting device only requires drilling bolt holes at the designated positions of the longitudinal beam 2 of the base plate. There is no need to weld auxiliary structures in advance. It has strong adaptability, and the drilling operation causes little damage to the paint of the longitudinal beam 2 of the base plate, making the paint easy to repair. The overall installation and use of the connecting device is convenient.

[0039] Due to the limited operating space between the carriage and the frame, in this embodiment, the first nut 403 is pre-fixed in the fixed seat 4, and the fixed seat 4 is not welded to the longitudinal beam 2 of the base plate. During the installation process, only the bolt 7 needs to be installed. Only one tool is needed to tighten the bolt, which reduces the space occupied and makes the operation more flexible.

[0040] Example 2 In another typical embodiment of the present invention, a connection device for a cargo truck body and a frame is provided, comprising: a fixing seat 4, a first connecting unit 5, a second connecting unit 6, a screw 8, a pressure plate 9, and a second nut 10. The fixing seat 4 is used to be placed inside the longitudinal beam 2 of the base plate. The fixing seat 4 is rectangular, and the width of the fixing seat 4 is the same as the flange width of the longitudinal beam 2 of the base plate. Two screws 8 are provided, both of which are vertically arranged. A first connecting unit 5 is installed on one side of the fixing seat 4. The upper end of one screw 8 is connected to the first connecting unit 5; the upper end of the other screw 8 is connected to a... A second connecting unit 6 is detachably connected to the fixing seat 4 via bolts 7. The second connecting unit 6 and the fixing seat 4 are respectively arranged on the inner and outer sides of the web of the bottom plate longitudinal beam 2. The lower ends of the two screws 8 are connected by a pressure plate 9. At least one second nut 10 is threaded to the lower end of each screw 8 to limit the position of the pressure plate 9. Specifically, the upper surface of the pressure plate 9 abuts against the lower surface of the frame longitudinal beam 3, so that the two screws 8, together with the first connecting unit 5 and the second connecting unit 6, can tighten and fix the bottom plate longitudinal beam 2 to the frame longitudinal beam 3.

[0041] In this embodiment, the horizontal section 12 of the first connecting unit 5 is provided with a through hole for the installation of the screw 8. The vertical section 11 of the first connecting unit 5 is fixedly connected to the side of the fixing seat 4 by welding, so as to fix the screw 8 and the fixing seat 4 together.

[0042] The first connecting unit 5 is pre-fixed to the fixed base 4 by welding, eliminating the need for bolts 7 during installation. This eliminates the use of bolts 7 during the installation process of the first connecting unit 5, simplifying on-site operations. Compared to the installation method using bolts 7, the installation of the first connecting unit 5 is no longer limited by the narrow space inside the longitudinal beam 2 of the base plate and obstructed view. It is only necessary to place the fixed base 4 and the first connecting unit 5 together inside the longitudinal beam 2 of the base plate and adjust them, which facilitates the installation of the first connecting unit 5.

[0043] The fixing base 4 includes a fixing base body 405. In this embodiment, the fixing base body 405 has a connecting hole 411 on the side for connecting with the second connecting unit 6, and a first nut 403 is welded and fixed at the corresponding position on the inner wall of the fixing base body 405 so as to connect with the second connecting unit 6 by bolts 7.

[0044] Example 3 In another typical embodiment of the present invention, a method for connecting the cargo box and the frame of a freight car is proposed, as follows: The floor longitudinal beam 2 of the cargo truck body is placed on the frame longitudinal beam 3, and the floor body 1 is fixedly installed on the upper surface of the floor longitudinal beam 2. The vertical section 11 of the first connecting unit 5 is connected to the side of the fixed base 4, and the horizontal section 12 of the first connecting unit 5 is connected to a screw 8, so that the vertical section 11 of the first connecting unit 5 is in contact with the side of the fixed base 4, and the horizontal section 12 of the first connecting unit 5 is perpendicular to the screw 8. After the mounting base 4, the first connecting unit 5, and the screw 8 are assembled, the installation position of the connecting device is determined according to the arrangement of the chassis accessories. Bolt holes are opened on the web of the longitudinal beam 2 of the base plate corresponding to the installation position of the connecting device. The number, diameter, and spacing of the bolt holes are the same as those of the second connecting unit 6. After assembly, the fixing seat 4 is placed in the inner cavity of the bottom plate longitudinal beam 2, so that the side of the fixing seat 4 away from the first connecting unit 5 is in contact with the inner side of the web of the bottom plate longitudinal beam 2. The second connecting unit 6 is placed on the outer side of the bottom plate longitudinal beam 2, so that the bolt holes on the second connecting unit 6 and the connecting holes 411 on the fixing seat 4 are aligned with the bolt holes on the web of the bottom plate longitudinal beam 2. Then, the vertical section 11 of the second connecting unit 6, the web of the bottom plate longitudinal beam 2 and the fixing seat 4 are fixedly connected together by bolts 7, and a screw 8 is connected to the horizontal section 12 of the second connecting unit 6. The first connecting unit 5 and the second connecting unit 6 are distributed opposite to each other on both sides of the frame longitudinal beam 3, so that the two screws 8 are distributed opposite to each other on both sides of the frame longitudinal beam 3. The pressure plate 9 is sleeved on the lower end of the two screws 8, so as to connect the lower ends of the two screws 8 on the first connecting unit 5 and the second connecting unit 6 using the pressure plate 9. At least one second nut 10 is threadedly connected to the lower end of each screw 8. The upper surface of the pressure plate 9 is abutted against the lower surface of the frame longitudinal beam 3 using the second nuts 10, so as to use the two screws 8 in conjunction with the first connecting unit 5 and the second connecting unit 6 to tighten and fix the bottom plate longitudinal beam 2 on the frame longitudinal beam 3.

[0045] The above-described method of installing the connecting device is suitable for cargo truck bodies with a split crossbeam structure. It eliminates the need to weld auxiliary structures onto the longitudinal beams 2 of the floor plate. During installation, only corresponding bolt holes need to be drilled. This not only minimizes damage to the paint on the longitudinal beams 2 of the floor plate, but also allows for adjustment of the position of the connecting device according to different chassis configurations, avoiding interference between the connecting device and chassis accessories, thereby improving the versatility of the cargo box.

[0046] In this embodiment, there are two connection methods between the first connecting unit 5 and the fixed base 4: welding and bolt connection. When using bolt connection, the vertical section 11 of the first connecting unit 5 is attached to the side of the fixed base 4, so that the bolt holes on the vertical section 11 of the first connecting unit 5 are aligned with the bolt holes on the corresponding side of the fixed base 4. Then, the bolt 7 is installed so that the bolt 7 is connected to the corresponding first nut 403, thereby detachably connecting the vertical section 11 of the first connecting unit 5 and the fixed base 4. When welding is used, the vertical section 11 of the first connecting unit 5 is attached to the side of the fixing base 4, and the vertical section 11 of the first connecting unit 5 is welded and fixedly connected to the side of the fixing base 4.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A connection between a truck bed and a frame, comprising: Two opposite screw rods (8) are arranged on both sides of the floor longitudinal beam (2), characterized in that the fixing seat (4) is further arranged in the floor longitudinal beam (2), and the fixing seat (4) is a rectangular body; A first connecting unit (5) is arranged on one side surface of the fixing seat (4), the first connecting unit (5) is connected with one screw rod (8), the upper end of the other screw rod (8) is connected with a second connecting unit (6), the second connecting unit (6) is detachably connected with the floor longitudinal beam (2) and the fixing seat (4) through bolts (7), the second connecting unit (6) and the fixing seat (4) are arranged on both sides of the web plate of the floor longitudinal beam (2), the lower ends of the two screw rods (8) are connected through a pressing plate (9), the lower end of the screw rod (8) is threadedly connected with a second nut (10), so that the upper surface of the pressing plate (9) is abutted against the lower surface of the frame longitudinal beam (3).

2. The truck bed-to-frame connection of claim 1, wherein, The width of the fixing seat (4) is the same as the wing surface width of the floor longitudinal beam (2).

3. The truck bed-to-frame connection apparatus of claim 1, wherein, The first connecting unit (5) and the second connecting unit (6) are both L-shaped structures.

4. The truck bed-to-frame connection apparatus of claim 3, wherein, The first connecting unit (5) and the second connecting unit (6) both include a vertical section (11) and a horizontal section (12), the vertical section (11) of the first connecting unit (5) is connected with the side surface of the fixing seat (4), the vertical section (11) of the second connecting unit (6) is connected with the side surface of the floor longitudinal beam (2), and the horizontal section (12) of the first connecting unit (5) and the second connecting unit (6) are both connected with the screw rod (8).

5. The truck bed-to-frame connection apparatus of claim 1, wherein, The first connecting unit (5) is detachably connected with the fixing seat (4) through the bolts (7).

6. The truck bed-to-frame connection apparatus of claim 1, wherein, The first connecting unit (5) is fixedly connected with the fixing seat (4).

7. The truck bed-to-frame connection apparatus of claim 1, wherein, A connecting hole (411) is arranged on the fixing seat (4), a first nut (403) is fixedly arranged on the inner wall of the fixing seat (4), the first nut (403) is coaxially arranged with the connecting hole (411), and the first nut (403) is used for being connected with the bolt (7).

8. The truck bed-to-frame connection apparatus of claim 1, wherein, A reinforcing plate (402) is fixedly arranged in the fixing seat (4).

9. A method of connecting a truck bed to a frame, the method comprising: The connecting device of the truck bed and the frame is adopted, and the connecting device comprises: The first connecting unit (5) is connected with the side surface of the fixing seat (4) and one screw rod (8) respectively; Bolt holes are arranged at the specified positions of the web plate of the floor longitudinal beam (2); The fixing seat (4) is arranged in the inner cavity of the floor longitudinal beam (2), so that the side surface of the fixing seat (4) away from the first connecting unit (5) is attached to the inner side of the web plate of the floor longitudinal beam (2), the second connecting unit (6) is arranged on the outer side of the floor longitudinal beam (2), the vertical section (11) of the second connecting unit (6), the web plate of the floor longitudinal beam (2) and the fixing seat (4) are fixedly connected together through the bolts (7), and one screw rod (8) is connected with the horizontal section (12) of the second connecting unit (6); The pressing plate (9) is sleeved on the lower ends of the two screw rods (8), the second nuts (10) are threadedly connected with the lower ends of the screw rods (8) respectively, the upper surface of the pressing plate (9) is abutted against the lower surface of the frame longitudinal beam (3) through the second nuts (10), so that the floor longitudinal beam (2) is tightly fixed on the frame longitudinal beam (3).

10. The method of claim 9, wherein, The vertical section (11) of the first connecting unit (5) is bolted (7) to the fixed base (4); Or, the vertical section (11) of the first connecting unit (5) is fixedly connected to the fixed base (4).

Images