Limiting structure for drawing beam and drawing beam

Abstract

The utility model relates to the field of trailer accessories, in particular to a limiting structure for a drawing beam and the drawing beam. The limiting structure for the drawing beam comprises an air chamber suitable for being installed on an outer beam; one end of the push rod is arranged in the air chamber, and the push rod can be driven by the air chamber to stretch out and draw back; the pin shaft is mounted at one end, far away from the air chamber, of the push rod and is connected with the outer beam and the inner beam; the pin hole seat is suitable for being installed on the inner beam, and a limiting groove matched with the pin shaft is formed in the pin hole seat. The limiting structure for the drawing beam drives the pin shaft to stretch out and draw back through the air chamber and the push rod, achieves fixation of the outer beam and the inner beam, and is simple in structure, convenient to use and high in reliability.

Description

Technical Field

[0001] The utility model relates to the field of trailer accessories, and particularly to a limiting structure for a drawbar and a drawbar. Background Art

[0002] The drawbar of a semi-trailer is a structural component for a semi-trailer, which allows the traction of the semi-trailer and the trailer part to be telescopic in the length direction, so as to meet different transportation requirements.

[0003] The Chinese invention patent application with the publication number of CN116923551A discloses a portable draw-fixed pin structure. The draw-fixed pin structure includes an outer beam, the outer beam is slidably connected to an inner beam, and the outer beam matches the draw-fixed pin structure. A draw block is fixedly connected to the outer wall of the inner beam, and an outer beam reinforcement plate is fixedly connected to the outer wall of the outer beam. The fixedly connected cover plate assembly is connected to the fixed pin assembly with a pin two, and the fixed pin group is placed in the outer beam reinforcement plate. The fixedly connected cover plate assembly is connected to the slider group with a pin four, and the slider group is fixedly connected to the inner wall of the outer beam. However, this portable draw-fixed pin structure is complex and has poor reliability.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] In order to improve or solve the technical problems of complex fixed pin structure and poor reliability in the prior art, the utility model provides a limiting structure for a drawbar. The limiting structure includes: an air chamber, which is suitable for being installed on the outer beam; a push rod, one end of which is arranged in the air chamber and is configured to be telescopic under the drive of the air chamber; a pin shaft, which is installed at the end of the push rod far from the air chamber and is configured to connect the outer beam and the inner beam; and a pin hole seat, which is suitable for being installed on the inner beam, and a limiting groove matching the pin shaft is formed on the pin hole seat.

[0006] The limiting structure for a drawbar of the utility model includes an air chamber, a push rod, a pin shaft and a pin hole seat. Among them, the air chamber is installed on the outer beam to drive the push rod to be telescopic. One end of the push rod is installed in the air chamber, and the other end is connected to the pin shaft to drive the pin shaft to be telescopic. The pin hole seat is installed on the inner beam and a limiting groove is formed. The pin shaft extends into the limiting groove under the drive of the push rod, so as to connect the outer beam and the inner beam and realize the limitation of the drawbar. Through the above settings, the limiting structure for a drawbar of the utility model drives the pin shaft to be telescopic through the air chamber and the push rod, realizes the fixation of the outer beam and the inner beam, has a simple structure, is convenient to use and has strong reliability.

[0007] Furthermore, the air chamber is installed on the outer beam through a mounting seat; the mounting seat includes a fixing plate fixedly connected to the air chamber and a connecting plate connecting the fixing plate and the outer beam; the push rod passes through the fixing plate and is connected to the pin shaft.

[0008] Further, the pin shaft includes a hinge portion that forms a hinge fit with the push rod and a plug portion that mates with the bushing; a limiting ring that abuts against the bushing is arranged on the outer circumference of the plug portion.

[0009] Further, the air chamber includes a housing, a rubber diaphragm arranged inside the housing, and a compression spring sleeved on the outer circumference of the push rod; an air inlet chamber and a spring chamber are formed inside the housing at intervals by the rubber diaphragm, and the push rod is arranged in the spring chamber.

[0010] Further, the pin hole seat includes a first angle plate and a second angle plate arranged opposite to each other; the first angle plate includes a limiting portion perpendicular to the inner beam and a guiding portion connected to the limiting portion and arranged obliquely; one end of the guiding portion is adapted to be connected to the inner beam, and the other end is connected to the end of the limiting portion away from the inner beam.

[0011] In order to improve or solve the technical problems of complex structure and poor reliability of the fixed pin in the prior art, the present utility model provides a draw beam. The draw beam includes: an outer beam, on which a first pin hole is formed; an inner beam, slidably arranged inside the outer beam; and the limiting structure for the draw beam according to any one of the above; the air chamber and the bushing of the limiting structure are installed on the outer beam; the pin hole seat of the limiting structure is installed on the inner beam, and the pin shaft passes through the first pin hole and extends into the limiting groove of the pin hole seat.

[0012] In summary, compared with the prior art, the present utility model has the following beneficial effects:

[0013] (1) The air chamber is installed on the outer beam and is used to drive the push rod to expand and contract; one end of the push rod is installed in the air chamber, and the other end is connected to the pin shaft and is used to drive the pin shaft to expand and contract; the pin hole seat is installed on the inner beam and forms a limiting groove, and the pin shaft extends into the limiting groove under the drive of the push rod, thereby connecting the outer beam and the inner beam to realize the limitation of the draw beam; the air chamber and the push rod drive the pin shaft to expand and contract to realize the fixation of the outer beam and the inner beam, with a simple structure, convenient use, and strong reliability. Description of the Drawings

[0014] The following describes the preferred embodiments of the present utility model with reference to the drawings, in which:

[0015] Figure 1 is a schematic diagram of an embodiment of the draw beam of the present utility model;

[0016] Figure 2 is a schematic diagram of the pin shaft being pulled out in the draw beam of the present utility model;

[0017] Figure 3 is a schematic diagram of the pin shaft being inserted in the draw beam of the present utility model.

[0018] List of reference numerals: 1. Outer beam; 2. Inner beam; 3. Air chamber; 4. Push rod; 5. Pin shaft; 51. Hinge part; 52. Insertion part; 53. Limit ring; 6. Bush; 7. Pin hole seat; 71. First angle plate; 711. Limit part; 712. Guide part; 72. Second angle plate; 8. Mounting seat; 81. Fixed plate; 82. Connecting plate. Detailed implementation manners

[0019] The preferred implementation manners of the present utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present utility model and are not intended to limit the protection scope of the present utility model.

[0020] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] In order to improve or solve the technical problems of the complex structure and poor reliability of the fixed pin in the prior art, the present utility model provides a limiting structure for a pull beam. The limiting structure includes: an air chamber 3, which is adapted to be installed on the outer beam 1; a push rod 4, one end of which is arranged in the air chamber 3 and is configured to be telescopic under the drive of the air chamber 3; a pin shaft 5, which is installed at the end of the push rod 4 far from the air chamber 3 and is configured to connect the outer beam 1 and the inner beam 2; a pin hole seat 7, which is adapted to be installed on the inner beam 2, and a limiting groove matching with the pin shaft 5 is formed on the pin hole seat 7.

[0023] Figure 1 is a schematic diagram of an embodiment of the pull beam of the present utility model, Figure 2 is a schematic diagram of the pin shaft being pulled out in the pull beam of the present utility model, Figure 3 is a schematic diagram of the pin shaft being inserted in the pull beam of the present utility model. As Figure 1 , Figure 2 andFigure 3 As shown, in one or more embodiments, the limiting structure of the present utility model for the draw beam includes an air chamber 3, a push rod 4, a pin shaft 5, a bushing 6, and a pin hole seat 7.

[0024] Continue to refer to Figure 1 、 Figure 2 and Figure 3 , in one or more embodiments, the air chamber 3 is adapted to be installed on the outer beam 1 of the draw beam. Specifically, the air chamber 3 includes a housing, a rubber diaphragm disposed inside the housing, and a compression spring sleeved on the circumferential outer side of the push rod 4. The rubber diaphragm divides the interior of the housing into an air inlet chamber 3 and a spring chamber. An air inlet is provided on the housing and is in communication with the air inlet chamber 3. By inhaling and discharging air through the air inlet, the pressure in the air inlet chamber is increased or decreased, and the rubber diaphragm moves accordingly, expanding or shrinking the volume of the air inlet chamber. One end of the push rod 4 extends into the spring chamber and is fixedly connected to the rubber diaphragm, moving with the movement of the rubber diaphragm to achieve the telescopic movement of the push rod 4. The compression spring is disposed in the spring chamber and is sleeved on the circumferential outer side of the push rod 4. When air is inhaled through the air inlet, the pressure in the air inlet chamber increases, the rubber diaphragm moves towards the spring chamber, the compression spring is compressed, and the push rod 4 extends; when air is discharged through the air inlet, the pressure in the air inlet chamber decreases, the compression spring pushes the rubber diaphragm to reset, and the push rod 4 retracts. Alternatively, other suitable air chamber structures can also be used in the present utility model as long as the flexible telescopic movement of the push rod 4 can be achieved. Further, the air chamber 3 is installed on the outer beam 1 through a mounting seat 8. Specifically, the mounting seat 8 includes a fixing plate 81 fixedly connected to the air chamber 3 and a connecting plate 82 connecting the fixing plate 81 and the outer beam 1. The fixing plate 81 is arranged parallel to the outer beam 1, the connecting plate 82 is arranged perpendicular to the outer beam 1, and both ends of the connecting plate 82 are respectively connected to the fixing plate 81 and the outer beam 1. There are two connecting plates 82. The push rod 4 passes through a through hole on the fixing plate 81 and is connected to the pin shaft 5.

[0025] Continue to refer to Figure 1 、 Figure 2 and Figure 3 , in one or more embodiments, one end of the push rod 4 is installed in the air chamber 3 and is fixedly connected to the rubber diaphragm, and it expands and contracts under the drive of the air chamber 3. The other end of the push rod 4 is provided with a hinge seat, and the hinge seat forms a hinged fit connection with the pin shaft 5. In one or more embodiments, the pin shaft 5 includes a hinge portion 51 that forms a hinged fit with the push rod 4 and a plug-in portion 52 that mates with the bushing 6. A limit ring 53 is provided at one end of the plug-in portion 52 close to the hinge portion 51, and the diameter of the limit ring 53 is greater than the inner diameter of the bushing 6. The bushing 6 is always sleeved on the circumferential outer side of the plug-in portion 52. When the pin shaft 5 is inserted, one end of the bushing 6 abuts against the pin hole seat 7, and the other end abuts against the limit ring 53 to limit the insertion depth of the pin shaft 5; when the pin shaft 5 is pulled out, the pin shaft 5 abuts against the inner beam 2 to prevent the bushing 6 from detaching from the pin shaft 5.

[0026] Continue to refer to Figure 1 、 Figure 2 and Figure 3 The pin hole seat 7 is installed on the inner beam 2. In one or more embodiments, the pin hole seat 7 includes a first angle plate 71 and a second angle plate 72 arranged oppositely. The first angle plate 71 and the second angle plate 72 have the same structure and are arranged at intervals in the pulling direction of the pulling beam. Specifically, the first angle plate 71 includes a limiting portion 711 perpendicular to the inner beam 2 and a guiding portion 712 connected to the limiting portion 711. Both the limiting portion 711 and the guiding portion 712 are substantially rectangular plate-shaped. The limiting portion 711 is arranged perpendicular to the inner beam 2, that is, it extends vertically from the inner beam 2 towards the outer beam 1, and the limiting portions 711 of the first angle plate 71 and the second angle plate 72 form a limiting groove matching the pin shaft 5. The guiding portion 712 is arranged obliquely, that is, the guiding portion 712 extends from the end of the limiting portion 711 away from the inner beam 2 towards the inner beam 2, so that the guiding portion 712 can guide the pin shaft 5 when the inner beam 2 expands and contracts, so that the pin shaft 5 can be inserted into the limiting groove.

[0027] In order to improve or solve the technical problems of complex structure and poor reliability of the fixed pin in the prior art, the present utility model also provides a pulling beam. The pulling beam includes an outer beam 1 with a first pin hole opened thereon; an inner beam 2 slidably arranged inside the outer beam 1; and the above-mentioned limiting structure for the pulling beam; the air chamber 3 and the bushing 6 of the limiting structure are installed on the outer beam 1; the pin hole seat 7 of the limiting structure is installed on the inner beam 2, and the pin shaft 5 passes through the first pin hole and extends into the limiting groove of the pin hole seat 7. Specifically, multiple groups of pin shaft seats 5 are evenly spaced along the length direction of the inner beam 2, and each group of pin shaft seats 5 includes two, and the two pin shaft seats 5 are respectively installed on both sides of the inner beam 2. Exemplarily, eight groups of pin shaft seats 5 are provided. Further, the air chamber 3, the push rod 4 and the pin shaft 5 are spaced into two groups along the length direction of the outer beam 1, and the interval between the two groups is the same as the interval between adjacent pin shaft seats 5. Each group of the air chamber 3, the push rod 4 and the pin shaft 5 includes two, and the two are respectively installed on both sides of the outer beam 1.

[0028] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present utility model.

Claims

1. A limiting structure for a pulling beam, characterized in that: include: An air chamber (3) adapted to be mounted on the outer beam (1); A push rod (4), one end of which is arranged in the air chamber (3) and is configured to be retractable under the drive of the air chamber (3); A pin (5) is mounted on an end of the push rod (4) away from the air chamber (3) and is configured to connect the outer beam (1) and the inner beam (2); The pin hole seat (7) is suitable for being installed on the inner beam (2), and a limiting groove matching the pin shaft (5) is formed on the pin hole seat (7).

2. The limiting structure for a pulling beam according to claim 1, characterized in that: The air chamber (3) is mounted on the outer beam (1) via a mounting seat (8); the mounting seat (8) comprises a fixing plate (81) fixedly connected to the air chamber (3), and a connecting plate (82) connecting the fixing plate (81) and the outer beam (1); the push rod (4) passes through the fixing plate (81) and is connected to the pin shaft (5).

3. The limiting structure for a pulling beam according to claim 1, characterized in that: It also includes a shaft sleeve (6), wherein the pin shaft (5) includes an articulated portion (51) that is articulated with the push rod (4), and an insert portion (52) that matches the shaft sleeve (6); a limiting ring (53) that abuts against the shaft sleeve (6) is arranged on the circumferential outer side of the insert portion (52).

4. The limiting structure for a pulling beam according to claim 1, characterized in that: The air chamber (3) comprises a housing, a rubber diaphragm arranged in the housing, and a compression spring sleeved on the outer side of the push rod (4) in a circumferential direction; an air intake chamber (3) and a spring chamber are formed inside the housing through the rubber diaphragm, and the push rod (4) is arranged in the spring chamber.

5. The limiting structure for a pulling beam according to claim 1, characterized in that: The pin hole seat (7) comprises a first angle plate (71) and a second angle plate (72) which are arranged opposite to each other; the first angle plate (71) comprises a limiting portion (711) which is perpendicular to the inner beam (2), and a guiding portion (712) which is connected to the limiting portion (711) and arranged obliquely; one end of the guiding portion (712) is suitable for being connected to the inner beam (2), and the other end is connected to an end of the limiting portion (711) which is away from the inner beam (2).

6. A tension beam, characterized in that: include: An outer beam (1), wherein a first pin hole is formed on the outer beam (1); An inner beam (2) slidably arranged inside the outer beam (1); and The limiting structure for a pulling beam as described in any one of claims 1 to 5; the air chamber (3) and the bushing (6) of the limiting structure are installed on the outer beam (1); the pin hole seat (7) of the limiting structure is installed on the inner beam (2), and the pin shaft (5) passes through the first pin hole and extends into the limiting groove of the pin hole seat (7).

Images