Semi-trailer and its frame

Abstract

The present invention provides a semi-trailer and a frame thereof, wherein the frame comprises an outer cross beam, an inner beam, a lifting lock, a base, and a locking pin assembly. The inner beam can be extended and retracted in the extension direction of the outer cross beam, and the lifting lock moves to a certain set position together with the inner beam, thereby realizing that the horizontal position of the lifting lock in the width direction of the semi-trailer frame is adjustable. Through the cooperation of the base, the locking pin assembly, the outer cross beam and the inner beam, the position locking of the outer cross beam and the inner beam is realized. At the same time, the pin in the locking pin assembly is blocked by the base, and the base limits the axial movement of the pin, thereby avoiding the situation of the pin being out of the pin. The semi-trailer in the present invention can be used to transport containers or mechanical equipment of different widths, thereby enhancing the practicality of the semi-trailer, realizing one vehicle for multiple uses, and no longer needing to select different models of semi-trailers for containers or mechanical equipment of different widths, reducing the number and cost of vehicles purchased by vehicle users, and making contributions to energy conservation and environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of transport equipment, in particular to a semitrailer and a frame thereof. Background Art

[0002] A semi-trailer is a vehicle used to transport bulk goods. When transporting containers or mechanical equipment, a lifting lock is usually used to fix it to the semi-trailer. The lifting lock has the advantages of high strength, easy operation, and good reliability. Usually, the position of the lifting lock is fixed and cannot be adjusted by horizontal movement. This limits the scope of use of semi-trailers with lifting locks. The only solution is to choose different models of semi-trailers according to the size of the container or mechanical equipment. Summary of the invention

[0003] One object of the present invention is to provide a semi-trailer frame, which solves the technical problem in the prior art that the lifting lock head cannot be adjusted in position by horizontal movement, and can ensure that the lifting lock head can be stably placed in a desired position.

[0004] Another object of the present invention is to provide a semi-trailer that can be used to transport containers or mechanical equipment of different widths and avoid overturning of the containers or mechanical equipment during transportation.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] According to one aspect of the present invention, the present invention provides a semi-trailer frame, which comprises:

[0007] An outer crossbeam, an inner beam mounted on at least one end of the outer crossbeam in an adjustable position along the extending direction of the outer crossbeam, and a lifting lock fixed on the inner beam and capable of moving with the inner beam;

[0008] A base, which is fixed on the outer wall surface of the outer crossbeam;

[0009] The locking pin assembly comprises a pin and a stopper fixed on the pin, wherein the pin sequentially passes through the base, the outer beam and the inner beam to limit the positions of the outer beam and the inner beam; moreover, the base can block the stopper that enters and exits the base with the pin to limit the axial movement of the pin.

[0010] In one embodiment, the base includes a base body and a retaining edge; a step hole is formed on the base body, the base body is fixed on the outer cross beam, and the end surface of the small hole in the step hole is in contact with the outer wall surface of the outer cross beam; the retaining edge is arranged at the large hole end of the step hole, and a notch is formed on the retaining edge;

[0011] The pin passes through the step hole, the outer beam and the inner beam on the seat body in sequence to define the positions of the outer beam and the inner beam. The stopper on the pin can enter and exit the seat body from the notch and be blocked by the retaining edge after the pin rotates around the axis.

[0012] Further improved, the locking pin assembly further comprises:

[0013] A handle is fixed at the end of the pin and is used for twisting the pin.

[0014] Preferably, the handle comprises a horizontal plate and a vertical plate, the horizontal plate and the vertical plate are assembled into a T-shape, the vertical plate is provided with a groove, and the end of the pin is fixed in the groove.

[0015] Further improved, the locking pin assembly further comprises:

[0016] A flexible connection member is provided, which connects the handle and the outer beam respectively.

[0017] Further improved, the semi-trailer frame also includes:

[0018] A reinforcing plate is fixed on the outer wall surface of the outer cross beam and is directly opposite to the base; the pin can pass through the reinforcing plate after passing through the outer cross beam.

[0019] Further improved, the semi-trailer frame also includes:

[0020] A plurality of reinforcing rib plates are evenly arranged inside the outer cross beam along the extension direction of the outer cross beam.

[0021] In one embodiment, a first lateral through hole is formed on the outer cross beam, and the base covers the first lateral through hole; a plurality of second lateral through holes are formed on the inner beam and are arranged at intervals along the extension direction of the inner beam; the pin passes through the base and then enters the first lateral through hole and any second lateral through hole to connect and lock the outer cross beam and the inner beam.

[0022] Further improved, the semi-trailer frame also includes:

[0023] The sleeves correspond one by one to the second lateral through holes, and each sleeve is inserted into a second lateral through hole; the pin passes through the base and then penetrates into the sleeves in the first lateral through hole and any second lateral through hole to connect and lock the outer beam and the inner beam.

[0024] The present invention also provides a semi-trailer, the frame of which is any of the frames described above, in which both ends of the outer cross beam are equipped with inner beams whose positions are adjustable along the extension direction of the outer cross beam, and each of the inner beams is fixed with a lifting lock that can move with the inner beam.

[0025] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0026] In the semi-trailer and its frame of the present invention, the inner beam can be extended and retracted in the extension direction of the outer beam, and the lifting lock moves to a certain set position together with the inner beam, thereby realizing that the horizontal position of the lifting lock in the width direction of the semi-trailer frame is adjustable. The position locking of the outer beam and the inner beam is achieved through the cooperation of the base, the lock pin assembly, the outer beam and the inner beam. At the same time, the pin in the lock pin assembly is blocked by the base, and the base limits the axial movement of the pin, thereby avoiding the situation of the pin falling off.

[0027] The semi-trailer of the present invention can be used to transport containers or mechanical equipment of different widths, thereby enhancing the practicality of the semi-trailer and realizing multiple uses of one vehicle. There is no need to select semi-trailers of different models for containers or mechanical equipment of different widths, thereby reducing the number and cost of vehicles purchased by vehicle users and contributing to energy conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a front view of a first state of assembly of an outer cross beam and an inner beam in a semitrailer frame provided by an embodiment of the present invention;

[0029] Figure 2 yes Figure 1 A top view of

[0030] Figure 3 It is a front view of a second state of assembly of an outer cross beam and an inner beam in a semitrailer frame provided by an embodiment of the present invention;

[0031] Figure 4 yes Figure 1 Middle AA section view;

[0032] Figure 5 It is a front view of the outer cross beam of the semi-trailer frame provided by an embodiment of the present invention;

[0033] Figure 6 yes Figure 5 Middle BB section view;

[0034] Figure 7 is a top view of an outer cross beam in a semitrailer frame provided by an embodiment of the present invention;

[0035] Figure 8 It is a front view of an inner beam in a semitrailer frame provided by an embodiment of the present invention;

[0036] Fig. 9 yes Figure 8 Middle CC section view;

[0037] Fig.10 is a front view of a locking pin assembly in a semitrailer frame provided by an embodiment of the present invention;

[0038] Fig.11 yes Fig.10 Left view of

[0039] Fig.12 It is a front view of a base in a semitrailer frame provided by an embodiment of the present invention;

[0040] Fig.13 yes Fig.12 Middle DD section view;

[0041] Fig.14 yes Fig.12 EE section view.

[0042] The following are the descriptions of the reference numerals:

[0043] 1. outer cross beam; 11. first lateral through hole;

[0044] 2. inner beam; 21. second lateral through hole;

[0045] 3. Lifting lock;

[0046] 4. base; 41. seat body; 411. step hole; 42. rib; 421. notch;

[0047] 5. Lock pin assembly; 51. Pin; 52. Stopper; 53. Handle; 531. Horizontal plate; 532. Vertical plate; 5321. Groove; 54. Flexible connector;

[0048] 6. Casing; 7. Reinforcement plate; 8. Reinforcement rib plate. DETAILED DESCRIPTION

[0049] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0050] The present invention provides a semitrailer and a frame thereof. The semitrailer frame is mainly composed of two longitudinal beams and several cross beams. The two longitudinal beams are arranged parallel to each other. The cross beams are connected between the two longitudinal beams and are evenly arranged in the extending direction of the longitudinal beams. In some semitrailer frames used for transporting containers or mechanical equipment, two or three cross beams are provided with locks for fixing the containers or mechanical equipment. The cross beams with locks can be called "lock cross beams".

[0051] The technical solution in this embodiment mainly improves the semi-trailer frame, and more specifically, improves the locking crossbeam of the semi-trailer frame. The specific solution is as follows:

[0052] like Figures 1 to 4 As shown, a semi-trailer frame has a retractable lock crossbeam, which includes an outer crossbeam 1, an inner beam 2, a lifting lock 3, a base 4, and a lock pin assembly 5. The position of the lock crossbeam in the semi-trailer frame and its connection relationship with the longitudinal beam or related structures can refer to the description of the related technology of the semi-trailer frame, which will not be repeated here.

[0053] In the vehicle frame as a whole, the outer cross beam 1 extends in the transverse direction of the vehicle frame, that is, in the width direction of the vehicle frame, and an inner beam 2 is arranged on at least one end of the outer cross beam 1. The inner beam 2 is installed at the end of the outer cross beam 1 in a positionally adjustable manner along the extending direction of the outer cross beam 1. The lifting lock 3 is fixed on the inner beam 2 and can move with the inner beam 2.

[0054] The base 4 is fixed on the outer wall surface of the outer cross beam 1. Fig.10 and Fig.11 As shown, the locking pin assembly 5 includes a pin 51 and a stopper 52 fixed to the pin 51, wherein the pin 51 is a cylindrical pin. The pin 51 passes through the base 4, the outer beam 1 and the inner beam 2 in sequence to define the positions of the outer beam 1 and the inner beam 2, and the base 4 can block the stopper 52 that enters and exits the base 4 with the pin 51 to limit the axial movement of the pin 51.

[0055] In the above-mentioned semitrailer frame, the inner beam 2 can be extended and retracted in the extension direction of the outer cross beam 1, and the lifting lock 3 moves to a certain set position together with the inner beam 2, thereby achieving that the horizontal position of the lifting lock 3 in the width direction of the semitrailer frame is adjustable.

[0056] In this way, when the semi-trailer needs to load containers or mechanical equipment of different widths, it is only necessary to pull out or withdraw the inner beam 2 according to the width of the container or mechanical equipment to be transported so that the lifting lock 3 is adjusted to a suitable position, and then the pin 51 is sequentially passed through the base 4, the outer cross beam 1 and the inner beam 2 to lock the positions of the outer cross beam 1 and the inner beam 2. At the same time, the pin 51 is blocked by the base 4, which limits the axial movement of the pin 51 to avoid the pin coming off.

[0057] In the field of semi-trailer technology, in order to enable a semi-trailer to transport containers of different sizes, the frame is usually modified in the length direction, that is, the extension direction of the longitudinal beam. For example, a telescopic beam is connected between the front frame and the rear frame, and the length of the frame is adjustable through the extension of the telescopic beam, so as to meet the transportation needs of containers of different lengths. Over time, in the field of semi-trailer technology, technicians have formed a technical bias, often only modifying the frame in length (the extension direction of the longitudinal beam) and ignoring the improvement in the width direction (the extension direction of the cross beam).

[0058] After using the semi-trailer frame in the above embodiment, the semi-trailer can be used to transport containers or mechanical equipment of different widths, thereby enhancing the practicality of the semi-trailer and realizing multiple uses of one vehicle. There is no need to select different types of semi-trailers for containers or mechanical equipment of different widths, which reduces the number and cost of vehicles purchased by vehicle users and contributes to energy conservation and environmental protection.

[0059] When the inner beam 2 and the lifting lock 3 are only provided at one end of the outer cross beam 1, when the inner beam 2 extends from the end of the outer cross beam 1 and the lifting lock 3 and the frame carry the container or mechanical equipment, the installation of the container or mechanical equipment on the frame may be asymmetrical, and thus additional measures may be required to ensure the stability of the container or mechanical equipment. Figures 1 to 3 As shown, inner beams 2 are installed at both ends of the outer beam 1, and the positions of the inner beams 2 are adjustable along the extension direction of the outer beam 1. A lifting lock 3 is fixed on each inner beam 2 and can move with the inner beam 2. In this way, the two inner beams 2 are symmetrically arranged on the same outer beam 1, and the two lifting locks 3 are also symmetrically arranged.

[0060] like Figure 1 As shown, when the inner beams 2 at both ends are extended, a wider container or mechanical equipment can be loaded on the frame. Figure 3 As shown, when the inner beams 2 at both ends are retracted to the outer cross beam 1, containers or mechanical equipment with a narrower width can be loaded on the frame.

[0061] When the frame carries containers or mechanical equipment, the inner beams 2 on both sides and the lifting locks 3 thereon bear the load together, and the center of gravity of the container or mechanical equipment is in the same straight line as the center of gravity of the semi-trailer frame, so that the inner beams 2 on both sides are not easy to bend, and the container or mechanical equipment is difficult to tilt, thereby avoiding the occurrence of overturning and improving the safety factor of the semi-trailer.

[0062] In addition, the outer cross beam 1 and the inner beam 2 are preferably steel box beams, and the cross-sectional shape of the box beam can be U-shaped, rectangular, square, horseshoe-shaped or other shapes to improve the load bearing and connection strength. Figure 6 and Fig. 9 As shown, both the outer cross beam 1 and the inner beam 2 are box beams with a square cross section. One end of the inner beam 2 can be inserted from one end of the outer cross beam 1, and the other end of the inner beam 2 is welded with a lifting lock 3. The outer cross beam 1 and the inner beam 2 are matched in size, and the gap between them is matched. Lubrication measures are taken between the outer cross beam 1 and the inner beam 2, such as coating grease.

[0063] Further improvements, such as Figure 5 and Figure 7As shown, a plurality of reinforcing ribs 8 are evenly arranged inside the outer cross beam 1 along the extension direction of the outer cross beam 1. Since the cross-sectional shape of the outer cross beam 1 is a square in this embodiment, the reinforcing ribs 8 are also square plates, and the side surfaces of each reinforcing rib 8 are inscribed in the inner surface of the outer cross beam 1. The reinforcing ribs 8 and the outer cross beam 1 can be fixed by welding or gluing. By providing these reinforcing ribs 8, the strength of the outer cross beam 1 is further improved to improve its load capacity and extend its service life.

[0064] In order to achieve that the position of the inner beam 2 at the end of the outer beam 1 along the extension direction of the outer beam 1 can be adjusted and locked as needed, the specific structure adopted in this embodiment is as follows:

[0065] like Figure 5 As shown, the outer cross beam 1 is provided with a first lateral through hole 11, which is located in the middle of the thickness direction of the outer cross beam 1. The base 4 covers the first lateral through hole 11, and the base 4 can be fixed to the outer wall surface of the outer cross beam 1 by welding. Figure 1 and Figure 8 As shown, the inner beam 2 is provided with a plurality of second lateral through holes 21 arranged at intervals along the extending direction of the inner beam. These second lateral through holes 21 are arranged in a line on the inner beam 2 and are located in the middle of the inner beam 2 in the thickness direction.

[0066] like Figure 1 As shown, the end of the inner beam 2 opposite to the lifting lock 3 can be inserted into the outer beam 1 from the end of the outer beam 1. As the inner beam 2 extends in and out of the outer beam 1, the inner beam 2 can adjust the position of the outer beam 1 in the extension direction, and the position adjustment of the lifting lock 3 is also achieved. During the extension and retraction process of the inner beam 2 at the end of the outer beam 1, the first lateral through hole 11 on the outer beam 1 can be aligned with any second lateral through hole 21 on the inner beam 2. When the inner beam 2 and the lifting lock 3 thereon are adjusted to a suitable position, the pin 51 is passed through the base 4 and then into the first lateral through hole 11 and a second lateral through hole 21 aligned with the first lateral through hole 11 to connect and lock the outer beam 1 and the inner beam 2.

[0067] In this embodiment, both ends of the outer crossbeam 1 are equipped with inner beams 2 that can be telescopically adjusted, so two first lateral through holes 11 are provided on the outer crossbeam 1, and one first lateral through hole 11 is provided near each end of the outer crossbeam 1. Each first lateral through hole 11 is covered with a base 4. The outer crossbeam 1 and the inner beams 2 at both ends can be locked in position by the cooperation of the pin 51, the first lateral through hole 11, and a second lateral through hole 21.

[0068] In addition, in order to ensure that the locking between the outer cross beam 1 and the inner beam 2 is more stable, several first lateral through holes 11 can be opened in the outer cross beam 1, and then a base 4 is covered on each first lateral through hole 11. Each inner beam 2 is firmly locked by inserting pins 51 through multiple pairs of corresponding first lateral through holes 11 and second lateral through holes 21.

[0069] Furthermore, the second lateral through holes 21 on the inner beam 2 can be evenly arranged, so as to achieve uniform adjustment of the position of the inner beam 2 on the outer cross beam 1 .

[0070] The above structure is simple and easy to implement. In addition to the above structure, only one second lateral through hole 21 can be provided on the inner beam 2, and a plurality of first lateral through holes 11 can be provided on the outer cross beam 1. The inner beam 2 is extended and retracted along the extension direction of the outer cross beam 1. When the inner beam 2 reaches the desired position, a first lateral through hole 11 can be aligned with the second lateral through hole 21, and then the pin 51 is inserted to achieve locking.

[0071] Further improvements, such as Fig. 9 As shown, a sleeve 6 is inserted into each second lateral through hole 21. The pin 51 passes through the base 4 and then enters the sleeves 6 in the first lateral through hole 11 and the second lateral through hole 21 to connect and lock the outer crossbeam 1 and the inner beam 2. The sleeve 6 provides a channel for the pin 51 to penetrate, so that the pin 51 can penetrate the crossbeam 1 and the inner beam 2 to lock the two.

[0072] Further improvements, such as Figure 6 As shown, a reinforcing plate 7 is fixed on the outer wall surface of the outer cross beam 1 opposite to the base 4. The reinforcing plate 7 is a steel plate, so the reinforcing plate 7 can be fixed on the outer cross beam 1 by welding. The pin 51 can pass through the reinforcing plate 7 after passing through the outer cross beam 1. The reinforcing plate 7 can be used to support the end of the pin 51. The pin 51 passes through the reinforcing plate 7, so it is obvious that a through hole is opened on the reinforcing plate 7, and the aperture of the through hole is equal to the outer diameter of the pin 51. The pin 51 and the through hole on the reinforcing plate 7 are preferably clearance-matched.

[0073] In this embodiment, if Figure 12 to Figure 14 As shown, the base 4 includes a base body 41 and a retaining edge 42, wherein the base body 41 is a block made of steel, and the retaining edge 42 is made of the same material as the base body 41. The base body 41 is provided with a step hole 411, the base body 41 is fixed to the outer cross beam 1, and the end face of the small hole in the step hole 411 is welded to the outer wall of the outer cross beam 1 after being fitted. In addition, a retaining edge 42 is provided at the opening of the large hole in the step hole 411, and a notch 421 is provided on the retaining edge 42. Fig.12 As shown, the retaining edge 42 is annular, and its outer circumference is inscribed in the inner wall of the large hole in the stepped hole 411, and the retaining edge 42 is located at the opening end of the large hole, and the end face of the retaining edge 42 is flush with the end face of the opening of the large hole. The notch 421 can interrupt the closed loop of the annular retaining edge 42. Figures 12 to 14As shown, the base body 41 and the rib 42 of the base 4 are connected as a whole.

[0074] like Fig.10 As shown, the stopper 52 is fixed on the pin 51 in the radial direction, and the stopper 52 is any one of a slotted screw, a cylindrical pin, and a conical pin. The pin 51 may be provided with a radial groove, and the cylindrical pin or the conical pin may be inserted tightly into the groove. The slotted screw and the pin 51 may be connected by threads.

[0075] One end of the pin 51 passes through the step hole 411 on the seat body 41, the first lateral through hole 11 on the outer cross beam 1, and the second lateral through hole 21 on the inner beam 2 in sequence, and then defines the position of the outer cross beam 1 and the inner beam 2. In the process of inserting the pin 51 into the above-mentioned parts in sequence, the stopper 52 on the pin 51 can enter the seat body 41 from the notch 421 on the retaining edge 42. The other end of the pin 51 is placed outside the seat body 41, and the pin 51 is twisted to rotate around its own axis. The stopper 52 is turned into the annular groove formed by the shoulder of the retaining edge 42 and the step hole 411. The shoulder of the retaining edge 42 and the step hole 411 blocks the axial movement of the pin 51, and avoids the occurrence of the pin falling off. Only by twisting the pin 51 and aligning the stopper 52 with the notch 421 can the pin 51 be pulled out from the seat body 41, the outer cross beam 1, and the inner beam 2. In order to facilitate the stopper 52 to enter and exit the notch 421, the width of the notch 421 is slightly larger than the width of the stopper 52.

[0076] After the pin 51 passes through the small hole in the stepped hole 411 of the seat body 41, it passes through the first lateral through hole 11 on the outer beam 1 and the second lateral through hole 21 on the inner beam 2 to define the position of the outer beam 1 and the inner beam 2. The diameter of the small hole in the stepped hole 411 is close to the diameter of the pin 51, and the small hole in the stepped hole 411 and the pin 51 are matched with each other, so that the pin 51 and the seat body 41 can be easily plugged in and out. Fig.10 and Fig.11 As shown, the pin 51 is provided with a handle 53 , which is fixed at the end of the pin 51 to facilitate the rotation of the pin 51 .

[0077] In this embodiment, if Fig.10 As shown, the handle 53 includes a horizontal plate 531 and a vertical plate 532. The horizontal plate 531 and the vertical plate 532 are assembled into a T shape, and the connection between the horizontal plate 531 and the vertical plate 532 adopts an arc transition. The vertical plate 532 is provided with a groove 5321, such as Fig.10 As shown, the groove 5321 is located at the middle position of the end of the vertical plate 532, and the end of the pin 51 is fixed in the groove 5321. The pin 51 and the groove 5321 can be fixed by clamping, welding or gluing. The horizontal plate 531 is used for finger gripping, and the vertical plate 532 bears torque. The handle 53 of such a structure is simple in structure, high in strength, safe and durable.

[0078] Further improvements, such as 2 and Figure 4As shown, a flexible connector 54 is connected between the handle 53 and the outer cross beam 1. The flexible connector 54 is a hanging chain or a hanging rope. In this embodiment, a steel ring chain is preferred. When the pin 51 is pulled out, it can be hung on the outer cross beam 1 with the help of the flexible connector 54 to facilitate finding the pin 51 and avoid affecting the transportation work due to the loss of the pin 51.

[0079] In the above-mentioned semi-trailer and its frame, the inner beam 2 can be extended and retracted in the extension direction of the outer cross beam 1, and the lifting lock 3 moves to a certain set position together with the inner beam 2, thereby achieving that the horizontal position of the lifting lock 3 in the width direction of the semi-trailer frame is adjustable.

[0080] In this way, when the semi-trailer needs to load containers or mechanical equipment of different widths, it is only necessary to pull out or withdraw the inner beam 2 according to the width of the container or mechanical equipment to be transported so that the lifting lock 3 is adjusted to a suitable position, and then the pin 51 is sequentially passed through the base 4, the outer beam 1 and the inner beam 2 to lock the positions of the outer beam 1 and the inner beam 2. At the same time, the pin 51 is blocked by the base 4, and the base 4 limits the axial movement of the pin 51 to avoid the pin falling off.

[0081] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A semi-trailer frame, characterized in that: include: An outer crossbeam, an inner beam mounted on at least one end of the outer crossbeam in an adjustable position along the extending direction of the outer crossbeam, and a lifting lock fixed on the inner beam and capable of moving with the inner beam; A base, which is fixed on the outer wall surface of the outer crossbeam; A locking pin assembly, comprising a pin and a stopper fixed to the pin, wherein the pin sequentially passes through the base, the outer crossbeam, and the inner beam to define the positions of the outer crossbeam and the inner beam; and the base can block the stopper that enters and exits the base with the pin to limit the axial movement of the pin; The base includes a seat body and a retaining edge; a step hole is provided on the seat body, the seat body is fixed on the outer cross beam, and the end surface of the small hole in the step hole is in contact with the outer wall surface of the outer cross beam; the retaining edge is provided at the large hole end of the step hole, and a notch is provided on the retaining edge; The pin passes through the step hole, the outer beam and the inner beam on the seat body in sequence to define the positions of the outer beam and the inner beam. The stopper on the pin can enter and exit the seat body from the notch and be blocked by the retaining edge after the pin rotates around the axis.

2. The semitrailer frame according to claim 1, characterized in that: The locking pin assembly also includes: A handle is fixed at the end of the pin and is used for twisting the pin.

3. The semitrailer frame according to claim 2, characterized in that: The handle comprises a horizontal plate and a vertical plate, wherein the horizontal plate and the vertical plate are assembled into a T-shape, and a groove is arranged on the vertical plate, and the end of the pin is fixed in the groove.

4. The semitrailer frame according to claim 2, characterized in that: The locking pin assembly also includes: A flexible connection member is provided, which connects the handle and the outer beam respectively.

5. The semitrailer frame according to claim 1, characterized in that: The semi-trailer frame also includes: A reinforcing plate is fixed on the outer wall surface of the outer cross beam and is directly opposite to the base; the pin can pass through the reinforcing plate after passing through the outer cross beam.

6. The semitrailer frame according to claim 1, characterized in that: The semi-trailer frame also includes: A plurality of reinforcing rib plates are evenly arranged inside the outer cross beam along the extension direction of the outer cross beam.

7. The semitrailer frame according to any one of claims 1 to 6, characterized in that: The outer crossbeam is provided with a first lateral through hole, and the base covers the first lateral through hole; the inner beam is provided with a plurality of second lateral through holes arranged at intervals along the extension direction of the inner beam; the pin passes through the base and then enters the first lateral through hole and any second lateral through hole to connect and lock the outer crossbeam and the inner beam.

8. The semitrailer frame according to claim 7, characterized in that: The semi-trailer frame also includes: The sleeves correspond one by one to the second lateral through holes, and each sleeve is inserted into a second lateral through hole; the pin passes through the base and then penetrates into the sleeves in the first lateral through hole and any second lateral through hole to connect and lock the outer beam and the inner beam.

9. A semi-trailer, characterized in that: The frame of the semi-trailer is the frame described in any one of claims 1 to 8, and both ends of the outer cross beam in the frame are equipped with inner beams whose positions are adjustable along the extension direction of the outer cross beam, and each of the inner beams is fixed with a lifting lock that can move with the inner beam.

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