An assembled chassis of a curtain-side box semitrailer

Abstract

An assembled chassis of a curtain-side box semi-trailer includes a left beam, a right beam, a front sealing frame and a rear sealing frame, wherein the left beam, the right beam, the front sealing frame and the rear sealing frame are spliced ​​into a rectangular frame and connected by a plurality of first bolts, two longitudinal beams are arranged between the front sealing frame and the rear sealing frame, and the two ends of the longitudinal beam are respectively connected to the front sealing frame and the rear sealing frame by a plurality of second bolts, a plurality of through beams are arranged between the left beam and the right beam, a first connecting member is arranged between the web of the through beam and the web of the longitudinal beam, the first connecting member is respectively connected to the web of the through beam and the web of the longitudinal beam by a plurality of third bolts, and the two ends of the through beam are respectively connected to the left beam and the right beam by a plurality of fourth bolts. The utility model adopts bolt assembly connection, which greatly reduces the dependence on skilled welding workers and greatly reduces the difficulty of workers' operation. The reliability is better than welding, the overall structure has strong fatigue resistance, and the surface coating has a long weather resistance period.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-trailers, in particular to an assembled underframe of a curtain-side box semi-trailer. Background Art

[0002] With the rapid development of the logistics and transportation industry in recent years, combined with the domestic requirements for environmental protection, road bridge protection, and road transportation safety, there has been a rapid increase in demand for transportation vehicles with strong versatility and high flexibility. At the same time, considering the key factors of transportation safety, timeliness, cargo protection, and efficient loading and unloading, the curtain-side van semi-trailer is undoubtedly the best choice.

[0003] However, the conventional semi-trailer chassis is made by welding corresponding components, which is more dependent on skilled welding workers, with high labor costs. In addition, processing defects such as false welding, desoldering, and leaking welding are prone to occur during welding operations. The overall structure has poor fatigue resistance. At the same time, the requirements for equipment, environment, and molding appearance are relatively strict, the processing cost is high, and the production of semi-trailers is difficult. Later vehicle maintenance and parts replacement are difficult. Furthermore, the surface coating of conventional semi-trailer chassis adopts traditional paint spraying and powder spraying processes, and the surface coating has a short weather resistance cycle and performs poorly in terms of surface hardness, corrosion resistance, oxidation resistance, and impact resistance.

[0004] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0005] The purpose of the utility model is to address the deficiencies of the prior art and thereby provide an assembled chassis for a curtain-side box semi-trailer. The utility model adopts a bolted assembled connection, which greatly reduces the reliance on skilled welding workers and the difficulty of workers' operations. The reliability is better than welding, the overall structure has strong fatigue resistance, and the surface coating has a long weather resistance period.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an assembled chassis of a curtain-side box semi-trailer, comprising a left beam, a right beam, a front sealing frame and a rear sealing frame, the left beam, the right beam, the front sealing frame and the rear sealing frame are spliced ​​into a rectangular frame, the front end of the left beam and the left end of the front sealing frame, the right end of the front sealing frame and the front end of the right beam, the rear end of the right beam and the right end of the rear sealing frame, and the left end of the rear sealing frame and the rear end of the left beam are all connected by a plurality of first bolts, two longitudinal beams spaced apart from each other in the middle of the rectangular frame are arranged between the front sealing frame and the rear sealing frame, and the two ends of the longitudinal beams are respectively It is connected to the front sealing frame and the rear sealing frame by a plurality of second bolts, a plurality of through beams spaced front and rear are arranged between the left beam and the right beam, the through beam crosses the webs of the two longitudinal beams, a first connecting member is arranged between the web of the through beam and the web of the longitudinal beam, the first connecting member is respectively connected to the web of the through beam and the web of the longitudinal beam by a plurality of third bolts, a fifth connecting member is respectively arranged at both ends of the through beam, the fifth connecting member on the left side is connected to the left end web and the left beam of the through beam, and the fifth connecting member on the right side is connected to the right end web and the right beam of the through beam by a plurality of fourth bolts.

[0007] Based on the above, the longitudinal beam is an H-shaped steel structure, and the longitudinal beam includes a front beam and a rear beam. The length of the front beam is smaller than that of the rear beam. The upper and lower wing plates of the front beam are respectively higher than the upper and lower wing plates of the rear beam. The web height of the front beam is smaller than that of the rear beam. The web height of the rear end of the front beam gradually increases from front to back. The rear end of the front beam is integrally connected with the front end of the rear beam. The wing plate on the upper side of the front beam and the wing plate on the upper side of the rear beam, as well as the wing plate on the lower side of the front beam and the wing plate on the lower side of the rear beam are transitionally connected by an inclined plate that is higher at the front and lower at the rear.

[0008] Based on the above, the frontmost through beam is a straight H-shaped steel beam, and the other through beams are W-shaped H-shaped steel beams. The frontmost through beam crosses the rear end web of the front beam, and the other through beams cross the web of the rear beam at equal intervals on the left and right. A number of longitudinal braces spaced apart on the left and right and located between the two rear beams are arranged between the two adjacent through beams crossing the web of the rear beam and between the rearmost through beam and the rear sealing frame. A second connecting member is arranged between the corresponding end web of the longitudinal brace and the web of the through beam, and the second connecting member is respectively connected to the corresponding end web of the longitudinal brace and the web of the through beam through a number of fifth bolts, and the rear end of the rearmost longitudinal brace is connected to the rear sealing frame through a number of sixth bolts.

[0009] Based on the above, a plurality of first wing braces spaced front-to-rear are arranged between the left beam and the rear beam on the left side, and between the right beam and the rear beam on the right side, a sixth connecting member is arranged between the left end of the first wing brace on the left side and the left beam, a seventh connecting member is arranged between the right end of the first wing brace on the right side and the right beam, the sixth connecting member and the left end web of the first wing brace on the left side and the left beam, and the seventh connecting member and the right end web of the first wing brace on the right side and the right beam are connected by a plurality of seventh bolts, a third connecting member is arranged between the right end web of the first wing brace on the left side and the web of the rear beam on the left side, a fourth connecting member is arranged between the left end web of the first wing brace on the right side and the web of the rear beam on the right side, the third connecting member is respectively connected to the right end web of the first wing brace on the left side and the web of the rear beam on the left side by a plurality of eighth bolts, and the fourth connecting member is respectively connected to the left end web of the first wing brace on the right side and the web of the rear beam on the right side by a plurality of ninth bolts.

[0010] Based on the above, the first connecting member, the second connecting member, the third connecting member and the fourth connecting member have the same structure, the first connecting member is an integrally formed corner code-shaped stamping part, and the right-angled sides of the first connecting member are integrally formed with reinforcing rib plates, and at least two first connecting holes for installing third bolts are provided on two mutually perpendicular connecting plates of the first connecting member, one of the connecting plates of the first connecting member is pressed and fitted with the web of the through beam, and the other connecting plate is pressed and fitted with the web of the longitudinal beam;

[0011] The fifth connecting member, the sixth connecting member and the seventh connecting member have the same structure. The fifth connecting member is an integrally formed T-shaped angle code connecting member or a T-shaped column base connecting member. The two mutually perpendicular connecting plates of the fifth connecting member are each provided with at least two second connecting holes for installing fourth bolts. One of the connecting plates of the fifth connecting member is pressed tightly against the web of the through-beam, and the other connecting plate is pressed tightly against the left beam or the right beam.

[0012] Based on the above, a plurality of cross braces are arranged between the two front beams at front and rear intervals, a plurality of second wing braces are arranged between the left beam and the left front beam and between the right beam and the right front beam at front and rear intervals and corresponding to each cross brace one by one on the left and right sides, the left end of the cross brace is in contact with the right side surface of the web of the left front beam, the right end of the second wing brace on the left is in contact with the left side surface of the web of the left front beam, the left end of the cross brace is connected to the right end of the corresponding second wing brace on the left by a plurality of tenth bolts passing through the web of the left front beam, the left end of the second wing brace on the left is connected to the left beam by a plurality of eleventh bolts, the right end of the cross brace is in contact with the left side surface of the web of the right front beam, the left end of the second wing brace on the right is in contact with the right side surface of the web of the right front beam, the right end of the cross brace is connected to the left end of the corresponding second wing brace on the right by a plurality of twelfth bolts passing through the web of the right front beam, and the right end of the second wing brace on the right is connected to the right beam by a plurality of thirteenth bolts.

[0013] Based on the above, the first bolt, the second bolt, the third bolt, the fourth bolt, the fifth bolt, the sixth bolt, the seventh bolt, the eighth bolt and the ninth bolt are all high-strength reamed hole bolts.

[0014] Based on the above, the tenth bolt, the eleventh bolt, the twelfth bolt and the thirteenth bolt are all high-strength tapped hole bolts.

[0015] Based on the above, the surfaces of the left beam, the right beam, the front sealing frame, the rear sealing frame, the longitudinal beam, the through beam, the longitudinal brace, the first wing brace, the transverse brace and the second wing brace are all provided with a galvanized layer.

[0016] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model has the following advantages:

[0017] The overall components of the chassis of the utility model are connected by bolt assembly, which greatly reduces the dependence on skilled welding workers and the difficulty of workers' operations compared to traditional welding. The labor cost is low and the processing cost can be saved well. At the same time, the bolt assembly connection will be more convenient and quick for later vehicle maintenance and parts replacement.

[0018] Furthermore, the bolts used are all high-strength tapped hole bolts, which can ensure the overall strength of the chassis after assembly. The reliability is better than welding, and it also effectively avoids processing defects such as cold welding, desoldering, and leaking welding that are prone to occur in welding operations. The overall structure has strong fatigue resistance.

[0019] Furthermore, the first connecting member, the second connecting member, the third connecting member and the fourth connecting member play the role of auxiliary connection, which can reduce the difficulty of processing the through beam, the longitudinal beam, the longitudinal brace and the first wing brace, and at the same time make the forces on each member uniform, and the overall load-bearing effect of the chassis is more reasonable.

[0020] Furthermore, the surfaces of the left beam, the right beam, the front sealing frame, the rear sealing frame, the longitudinal beam, the through beam, the longitudinal brace, the first wing brace, the cross brace and the second wing brace are all provided with a galvanized layer, that is, the entire surface of the chassis is galvanized. Compared with the traditional paint spraying and powder spraying processes, the surface coating weather resistance cycle is longer, and it is excellent in surface hardness, corrosion resistance, oxidation resistance and impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a top view of the utility model.

[0022] Figure 2 yes Figure 1 AA section view in.

[0023] Figure 3 yes Figure 1 BB section view in.

[0024] Figure 4 yes Figure 1 CC section view in.

[0025] Figure 5 yes Figure 1 DD section view in.

[0026] Figure 6 yes Figure 1 A partial enlarged view of point F in the middle.

[0027] Figure 7 yes Figure 1 A partial enlarged view of point G in the middle.

[0028] Figure 8 yes Figure 1 A partial enlarged view of point H in the middle.

[0029] Fig. 9 yes Figure 1 A partial enlarged view of point I in the middle.

[0030] Fig.10 It is a front view of the first connecting member of the utility model.

[0031] Fig.11 yes Fig.10 Top view of .

[0032] In the figure: 1. left beam; 2. right beam; 3. front sealing frame; 4. rear sealing frame; 5. longitudinal beam; 501. front section beam; 502. rear section beam; 6. through beam; 7. first connecting member; 8. third bolt; 9. fifth connecting member; 10. fourth bolt; 11. longitudinal brace; 12. second connecting member; 13. fifth bolt; 14. first wing brace; 15. third connecting member; 16. fourth connecting member; 17. eighth bolt; 18. ninth bolt; 19. stiffening rib plate; 20. first connecting hole; 22. horizontal brace; 23. second wing brace; 24. tenth bolt; 25. eleventh bolt; 26. twelfth bolt; 27. thirteenth bolt. DETAILED DESCRIPTION

[0033] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0034] by Figure 1 The lower side is the front side, Figure 1 The upper side is the rear side.

[0035] like Figure 1-11As shown, an assembled chassis of a curtain-side van semitrailer comprises a left beam 1, a right beam 2, a front sealing frame 3 and a rear sealing frame 4, which are spliced ​​into a rectangular frame, the front end of the left beam 1 and the left end of the front sealing frame 3, the right end of the front sealing frame 3 and the front end of the right beam 2, the rear end of the right beam 2 and the right end of the rear sealing frame 4, and the left end of the rear sealing frame 4 and the rear end of the left beam 1 are all connected by a plurality of first bolts, and two longitudinal beams 5 spaced apart from each other in the middle of the rectangular frame are arranged between the front sealing frame 3 and the rear sealing frame 4, and the two ends of the longitudinal beam 5 are respectively connected to the front sealing frame 3 and the rear sealing frame 4 by a plurality of first bolts. The main beam is connected by the second bolt, and a plurality of through beams 6 spaced front to rear are arranged between the left beam 1 and the right beam 2. The through beam 6 crosses the webs of the two longitudinal beams 5. A first connecting member 7 is arranged between the web of the through beam 6 and the web of the longitudinal beam 5. The first connecting member 7 is respectively connected to the web of the through beam 6 and the web of the longitudinal beam 5 through a plurality of third bolts 8. A fifth connecting member 9 is respectively arranged at both ends of the through beam 6. The fifth connecting member 9 on the left side is connected to the left end web of the through beam 6 and the left beam 1, and the fifth connecting member 9 on the right side is connected to the right end web of the through beam 6 and the right beam 2 through a plurality of fourth bolts 10.

[0036] The longitudinal beam 5 is an H-shaped steel structure, and the longitudinal beam 5 includes a front beam 501 and a rear beam 502. The length of the front beam 501 is smaller than that of the rear beam 502. The upper and lower wing plates of the front beam 501 are respectively higher than the upper and lower wing plates of the rear beam 502. The web height of the front beam 501 is smaller than that of the rear beam 502. The web height of the rear end of the front beam 501 gradually increases from front to back. The rear end of the front beam 501 is integrally connected with the front end of the rear beam 502. The upper wing plate of the front beam 501 and the upper wing plate of the rear beam 502, as well as the lower wing plate of the front beam 501 and the lower wing plate of the rear beam 502 are transitionally connected by an inclined plate that is higher at the front and lower at the back.

[0037] The frontmost through beam 6 is a straight H-shaped steel beam, and the remaining through beams 6 are W-shaped H-shaped steel beams. The frontmost through beam 6 crosses the rear end web of the front beam 501, and the remaining through beams 6 cross the web of the rear beam 502 at equal intervals on the left and right. A plurality of longitudinal braces 11 spaced apart on the left and right and located between the two rear beams 502 are arranged between two adjacent through beams 6 crossing the web of the rear beam 502 and between the rearmost through beam 6 and the rear sealing frame 4. A second connecting member 12 is arranged between the corresponding end web of the longitudinal brace 11 and the web of the through beam 6. The second connecting member 12 is respectively connected to the corresponding end web of the longitudinal brace 11 and the web of the through beam 6 by a plurality of fifth bolts 13. The rear end of the rearmost longitudinal brace 11 is connected to the rear sealing frame 4 by a plurality of sixth bolts.

[0038] A plurality of first wing braces 14 are arranged between the left beam 1 and the left rear beam 502, and between the right beam 2 and the right rear beam 502. A sixth connecting member is arranged between the left end of the first wing brace 14 on the left and the left beam 1, and a seventh connecting member is arranged between the right end of the first wing brace 14 on the right and the right beam 2. The sixth connecting member and the left end web plate of the first wing brace 14 on the left and the left beam 1, and the seventh connecting member and the right end web plate of the first wing brace 14 on the right and the right beam 2 are all connected by a plurality of seventh bolts. A third connecting member 15 is provided between the right end web of the first wing strut 14 and the web of the rear section beam 502 on the left, and a fourth connecting member 16 is provided between the left end web of the first wing strut 14 on the right and the web of the rear section beam 502 on the right. The third connecting member 15 is respectively connected to the right end web of the first wing strut 14 on the left and the web of the rear section beam 502 on the left through a plurality of eighth bolts 17, and the fourth connecting member 16 is respectively connected to the left end web of the first wing strut 14 on the right and the web of the rear section beam 502 on the right through a plurality of ninth bolts 18.

[0039] The first connecting member 7, the second connecting member 12, the third connecting member 15 and the fourth connecting member 16 have the same structure. The first connecting member 7 is an integrally formed corner code-shaped stamping part. The right-angled sides of the first connecting member 7 are integrally formed with reinforcing ribs 19. The two mutually perpendicular connecting plates of the first connecting member 7 are each provided with at least two first connecting holes 20 for installing the third bolts 8. One of the connecting plates of the first connecting member 7 is pressed and fitted with the web of the through beam 6, and the other connecting plate is pressed and fitted with the web of the longitudinal beam 5.

[0040] The fifth connecting member 9, the sixth connecting member and the seventh connecting member have the same structure. The fifth connecting member 9 is an integrally formed T-shaped angle code connector or a T-shaped column base connector. The two mutually perpendicular connecting plates of the fifth connecting member 9 are each provided with at least two second connecting holes for installing the fourth bolts 10. One of the connecting plates of the fifth connecting member 9 is pressed tightly against the web of the through-beam 6, and the other connecting plate is pressed tightly against the left beam 1 or the right beam 2.

[0041] A plurality of cross braces 22 spaced front to back are arranged between the two front beams 501, a plurality of second wing braces 23 spaced front to back and corresponding to each cross brace 22 are arranged between the left beam 1 and the left front beam 501 and between the right beam 2 and the right front beam 501, the left end of the cross brace 22 is attached to the right side of the web of the left front beam 501, the right end of the second wing brace 23 on the left is attached to the left side of the web of the left front beam 501, and the left end of the cross brace 22 and the right end of the corresponding second wing brace 23 on the left are connected through a plurality of cross braces passing through the left front beam The left end of the second wing brace 23 on the left is connected to the left beam 1 through a plurality of eleventh bolts 25, the right end of the cross brace 22 is attached to the left side of the web of the front section beam 501 on the right, the left end of the second wing brace 23 on the right is attached to the right side of the web of the front section beam 501 on the right, the right end of the cross brace 22 is connected to the left end of the corresponding second wing brace 23 on the right through a plurality of twelfth bolts 26 passing through the web of the front section beam 501 on the right, and the right end of the second wing brace 23 on the right is connected to the right beam 2 through a plurality of thirteenth bolts 27.

[0042] The first bolt, the second bolt, the third bolt 8, the fourth bolt 10, the fifth bolt 13, the sixth bolt, the seventh bolt, the eighth bolt 17 and the ninth bolt 18 are all high-strength reamed hole bolts.

[0043] The tenth bolt 24 , the eleventh bolt 25 , the twelfth bolt 26 and the thirteenth bolt 27 are all high-strength reamed hole bolts.

[0044] The surfaces of the left beam 1, the right beam 2, the front sealing frame 3, the rear sealing frame 4, the longitudinal beam 5, the through beam 6, the longitudinal brace 11, the first wing brace 14, the transverse brace 22 and the second wing brace 23 are all provided with a galvanized layer.

[0045] The overall components of the chassis of the utility model are connected by bolt assembly, which greatly reduces the dependence on skilled welding workers and the difficulty of workers' operations compared to traditional welding. The labor cost is low and the processing cost can be saved well. At the same time, the bolt assembly connection will be more convenient and quick for later vehicle maintenance and parts replacement.

[0046] Furthermore, the bolts used are all high-strength tapped hole bolts, which can ensure the overall strength of the chassis after assembly. The reliability is better than welding, and it also effectively avoids processing defects such as cold welding, desoldering, and leaking welding that are prone to occur in welding operations. The overall structure has strong fatigue resistance.

[0047] Furthermore, the first connecting member 7, the second connecting member 12, the third connecting member 15 and the fourth connecting member 16 play an auxiliary connection role, which can reduce the difficulty of processing the through beam 6, the longitudinal beam 5, the longitudinal brace 11 and the first wing brace 14, and at the same time make the forces on each member uniform, and the overall load-bearing effect of the chassis is more reasonable.

[0048] Furthermore, the surfaces of the left beam 1, the right beam 2, the front sealing frame 3, the rear sealing frame 4, the longitudinal beam 5, the through beam 6, the longitudinal brace 11, the first wing brace 14, the transverse brace 22 and the second wing brace 23 are all provided with a galvanized layer, that is, the entire surface of the chassis is galvanized. Compared with the traditional paint spraying and powder spraying processes, the surface coating weather resistance cycle is longer, and it is excellent in surface hardness, corrosion resistance, oxidation resistance and impact resistance.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. An assembled chassis of a curtain-side van semitrailer, characterized in that: The frame comprises a left beam, a right beam, a front sealing frame and a rear sealing frame, which are spliced ​​into a rectangular frame, the front end of the left beam and the left end of the front sealing frame, the right end of the front sealing frame and the front end of the right beam, the rear end of the right beam and the right end of the rear sealing frame, and the left end of the rear sealing frame and the rear end of the left beam are connected by a plurality of first bolts, two longitudinal beams spaced apart from each other in the middle of the rectangular frame are arranged between the front sealing frame and the rear sealing frame, and the two ends of the longitudinal beams are respectively connected to the front sealing frame and the rear sealing frame by a plurality of second bolts, A plurality of through beams spaced front to rear are arranged between the left beam and the right beam, the through beams cross the webs of the two longitudinal beams, a first connecting member is arranged between the webs of the through beams and the webs of the longitudinal beams, the first connecting member is respectively connected to the webs of the through beams and the webs of the longitudinal beams through a plurality of third bolts, a fifth connecting member is respectively arranged at both ends of the through beam, the fifth connecting member on the left side is connected to the left end web and the left beam of the through beam, and the fifth connecting member on the right side is connected to the right end web and the right beam of the through beam through a plurality of fourth bolts.

2. The assembled chassis of the curtain side trailer according to claim 1, characterized in that: The longitudinal beam is an H-shaped steel structure, which includes a front beam and a rear beam. The length of the front beam is smaller than that of the rear beam. The upper and lower wing plates of the front beam are respectively higher than the upper and lower wing plates of the rear beam. The web height of the front beam is smaller than that of the rear beam. The web height of the rear end of the front beam gradually increases from front to back. The rear end of the front beam is integrally connected with the front end of the rear beam. The upper wing plate of the front beam and the upper wing plate of the rear beam, as well as the lower wing plate of the front beam and the lower wing plate of the rear beam are transitionally connected by inclined plates that are higher at the front and lower at the back.

3. The assembled chassis of the curtain side trailer according to claim 2, characterized in that: The frontmost through beam is a straight H-shaped steel beam, and the other through beams are W-shaped H-shaped steel beams. The frontmost through beam crosses the rear end web of the front beam, and the other through beams cross the web of the rear beam at equal intervals on the left and right. A number of longitudinal braces spaced apart on the left and right and located between the two rear beams are arranged between two adjacent through beams crossing the web of the rear beam and between the rearmost through beam and the rear sealing frame. A second connecting member is arranged between the corresponding end web of the longitudinal brace and the web of the through beam, and the second connecting member is respectively connected to the corresponding end web of the longitudinal brace and the web of the through beam by a number of fifth bolts, and the rear end of the rearmost longitudinal brace is connected to the rear sealing frame by a number of sixth bolts.

4. The assembled chassis of the curtain side box semi-trailer according to claim 3, characterized in that: A plurality of first wing braces spaced front-to-rear are arranged between the left beam and the rear beam on the left side, and between the right beam and the rear beam on the right side. A sixth connecting member is arranged between the left end of the first wing brace on the left side and the left beam, and a seventh connecting member is arranged between the right end of the first wing brace on the right side and the right beam. The sixth connecting member and the left end web plate of the first wing brace on the left side and the left beam, and the seventh connecting member and the right end web plate of the first wing brace on the right side and the right beam are connected by a plurality of seventh bolts. A third connecting member is arranged between the right end web plate of the first wing brace on the left side and the web plate of the rear beam on the left side, and a fourth connecting member is arranged between the left end web plate of the first wing brace on the right side and the web plate of the rear beam on the right side. The third connecting member is respectively connected to the right end web plate of the first wing brace on the left side and the web plate of the rear beam on the left side by a plurality of eighth bolts, and the fourth connecting member is respectively connected to the left end web plate of the first wing brace on the right side and the web plate of the rear beam on the right side by a plurality of ninth bolts.

5. The assembled chassis of the curtain side box semi-trailer according to claim 4, characterized in that: The first connecting member, the second connecting member, the third connecting member and the fourth connecting member have the same structure. The first connecting member is an integrally formed corner code-shaped stamping part. The right-angled sides of the first connecting member are integrally formed with reinforcing rib plates. Two mutually perpendicular connecting plates of the first connecting member are each provided with at least two first connecting holes for installing third bolts. One of the connecting plates of the first connecting member is pressed and fitted with the web of the through beam, and the other connecting plate is pressed and fitted with the web of the longitudinal beam. The fifth connecting member, the sixth connecting member and the seventh connecting member have the same structure. The fifth connecting member is an integrally formed T-shaped angle code connecting member or a T-shaped column base connecting member. The two mutually perpendicular connecting plates of the fifth connecting member are each provided with at least two second connecting holes for installing fourth bolts. One of the connecting plates of the fifth connecting member is pressed tightly against the web of the through-beam, and the other connecting plate is pressed tightly against the left beam or the right beam.

6. The assembled chassis of the curtain side trailer according to claim 4, characterized in that: A plurality of cross braces spaced front to back are arranged between the two front beams, a plurality of second wing braces spaced front to back and corresponding to each cross brace are arranged between the left beam and the left front beam and between the right beam and the right front beam, the left end of the cross brace is attached to the right side surface of the web of the left front beam, the right end of the second wing brace on the left is attached to the left side surface of the web of the left front beam, the left end of the cross brace is connected to the right end of the corresponding second wing brace on the left by a plurality of tenth bolts passing through the web of the left front beam, the left end of the second wing brace on the left is connected to the left beam by a plurality of eleventh bolts, the right end of the cross brace is attached to the left side surface of the web of the right front beam, the left end of the second wing brace on the right is attached to the right side surface of the web of the right front beam, the right end of the cross brace is connected to the left end of the corresponding second wing brace on the right by a plurality of twelfth bolts passing through the web of the right front beam, and the right end of the second wing brace on the right is connected to the right beam by a plurality of thirteenth bolts.

7. The assembled chassis of the curtain side trailer according to claim 4, characterized in that: The first bolt, the second bolt, the third bolt, the fourth bolt, the fifth bolt, the sixth bolt, the seventh bolt, the eighth bolt and the ninth bolt are all high-strength reamed hole bolts.

8. The assembled chassis of the curtain side trailer according to claim 6, characterized in that: The tenth bolt, the eleventh bolt, the twelfth bolt and the thirteenth bolt are all high-strength tapped hole bolts.

9. The assembled chassis of the curtain side box semi-trailer according to claim 6, characterized in that: The surfaces of the left beam, the right beam, the front sealing frame, the rear sealing frame, the longitudinal beam, the through beam, the longitudinal brace, the first wing brace, the transverse brace and the second wing brace are all provided with a galvanized layer.

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