Two-way limiting device and method for freight transport system

Abstract

The invention discloses a bidirectional limiting device and method for a freight system. The bidirectional limiting device comprises a box body, a lock arm, a cross beam, a boss, a rocker arm rotating shaft and a connecting rod rotating shaft, the middle of the locking arm is rotationally connected into the box body, and the top of the locking arm extends out of the top of the box body; the rocker arm rotating shaft is positioned on the other side of the bottom of the locking arm; the rocker arm rotating shaft and the connecting rod rotating shaft are both rotationally connected with the box body. The rocker arm rotating shaft is fixedly connected with the first rocker arm tail end and the second rocker arm tail end. The connecting rod rotating shaft is located obliquely above the second rocker arm and fixedly connected with the middle of a crank arm, the first end of the crank arm makes contact with the second rocker arm, and the second end of the crank arm is connected with a motor. The boss is fixed on one side of the crank arm first end away from the rocker arm 2. The size of the limiting device is reduced, the weight of the limiting device is reduced, and the locking and unlocking speed of the limiting device is increased.

Description

Technical Field

[0001] The invention belongs to the field of transport aircraft airdrop, and relates to a two-way limiting device and method for a freight system. Background Art

[0002] With the development of science and technology, transport aircraft are increasingly used in military, civilian and commercial fields. During the gravity airdrop process, the transport aircraft uses a certain elevation angle maintained during flight to slide the cargo along the "unloading platform". To ensure the safety and smoothness of this process, aircraft designers install guide limit devices similar to train tracks on the "unloading platform". The limit devices are key components to ensure the stable and safe transportation of cargo pallets in the aircraft cargo hold. These devices are designed to prevent the cargo pallets from moving or tilting during flight, thereby protecting the safety of the cargo and the aircraft.

[0003] For example, the A400M transport aircraft of Airbus Defense is equipped with double-track guide and limit devices, which can ensure that the cargo remains stable during the sliding process and prevent the cargo from getting out of control or being damaged due to unexpected situations.

[0004] Most of the existing unmanned transport aircraft's cargo pallet bidirectional limiting devices adopt a purely mechanical structure, which cannot realize the automatic airdrop function of the cargo pallet; some electronically controlled bidirectional limiting devices use dual motors and multi-stage gear transmission to drive the limiting device to lock and unlock, which is large in size, heavy in weight, and takes a long time to unlock, and cannot meet the requirements of high-precision delivery; the limiting device of manned transport aircraft is heavy and has no bidirectional limiting function, and cannot be directly used on unmanned transport aircraft. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a two-way limiting device and method for a freight system, reduce the volume of the limiting device, reduce the weight of the limiting device, and increase the locking and unlocking speed of the limiting device.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A two-way limiting device for a freight system comprises a box body, a locking arm, a crossbeam, a boss, a rocker arm rotating shaft and a connecting rod rotating shaft; The middle part of the lock arm is rotatably connected to the inside of the box body, and the top of the lock arm extends out from the top of the box body; the crossbeam is located on one side of the bottom of the lock arm, and the rocker arm shaft is located on the other side of the bottom of the lock arm; The rocker arm shaft and the connecting rod shaft are both rotatably connected to the box body, the rocker arm shaft is fixedly connected to the end of the first rocker arm and the end of the second rocker arm; the connecting rod shaft is located obliquely above the second rocker arm, the connecting rod shaft is fixedly connected to the middle of the crank arm, the first end of the crank arm contacts the second rocker arm, and the second end of the crank arm is connected to the motor; the boss is fixed to the side of the first end of the crank arm away from the second rocker arm; When limiting, the crossbeam fits one side of the bottom of the locking arm, the front end of rocker arm one fits the other side of the bottom of the locking arm, the first end of the crank arm forms point-to-surface contact with the front end face of rocker arm two, the normal of the first end of the crank arm is inclined toward the side away from rocker arm two, the first end of the crank arm has a tendency to rotate counterclockwise, and the side wall of the first end of the crank arm is in contact with the boss.

[0007] Preferably, a core shaft is provided at the front end of the rocker arm, and a shaft sleeve is rotatably connected to the outside of the core shaft.

[0008] Furthermore, a circular arc surface is provided at the bottom of the locking arm.

[0009] Preferably, a limit pin is provided in the box body, and the limit pin is located above the rocker arm shaft.

[0010] Preferably, a notch is formed at the first end of the crank arm, a pin is installed in the notch, and the second front end surface of the rocker arm contacts the pin.

[0011] Preferably, a V-shaped groove surface is provided on the middle upper side of the second rocker arm.

[0012] Preferably, the end of the active rod is vertically fixedly connected to the output shaft of the motor, an active rod boss is arranged at the front end of the active rod, a waist-shaped hole is arranged at the second end of the crank arm, and the active rod boss is slidably connected in the waist-shaped hole.

[0013] Preferably, the connecting rod shaft extends out of the box body and is connected to a manual lever.

[0014] A limiting method for a two-way limiting device of a freight system, when the heading is limited, the cargo pallet is pressed against the upper end of the front end surface of a locking arm, and the bottom end side surface of the front end surface of the locking arm presses against the crossbeam to prevent the locking arm from rotating counterclockwise, thereby realizing the heading limit of the cargo pallet; When limiting movement in the reverse direction, the cargo pallet is against the upper end of the rear end surface of the locking arm, and the lower end of the rear end surface of the locking arm is against the front end of rocker arm one, driving rocker arm one and rocker arm two to rotate counterclockwise, and the front end surface of rocker arm two is against the first end of the crank arm, and the first end of the crank arm rotates counterclockwise, and the side wall of the first end of the crank arm contacts the boss, and the boss limits the first end of the crank arm from continuing to rotate counterclockwise, so that rocker arm one and rocker arm two remain fixed, thereby achieving reverse direction limiting of the cargo pallet.

[0015] Preferably, when the pallet is released, the manual lever or the motor is powered on and rotated, driving the crank arm to rotate clockwise, the end face of the second rocker arm loses support, and rotates counterclockwise under the thrust of the pallet, causing the locking arm to lie flat, thereby achieving the release of the pallet.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes locking of the bidirectional limit device through a single motor, thereby realizing the limit and release of the pallet, without manual operation, small size, light weight, and short limit release time; the single motor drives the rocker arm to rotate clockwise and counterclockwise to realize the opening and limit of the lock arm, reducing weight and cost.

[0017] Furthermore, the shaft sleeve can rotate around the core shaft, and when the limit and locking are cancelled, the locking arm and the rocker arm can rotate smoothly to avoid jamming.

[0018] Furthermore, after the limit is cancelled, the rocker arm rotates counterclockwise to the limit pin and stops rotating, making it easy to return to the limit position.

[0019] Furthermore, when the limit is cancelled, the rocker arm 2 rotates counterclockwise and the pin shaft is located in the V-shaped groove surface, which not only limits the rocker arm 2 in the counterclockwise direction, but also makes it convenient for the first end of the crank arm to rotate when locking, and drive the rocker arm 2 to rotate through the pin shaft until the end face of the front end of the rocker arm 2 contacts the pin shaft, thereby achieving automatic locking.

[0020] Furthermore, the active rod and the second end of the crank arm form a crank slider mechanism, which drives the crank arm to rotate through the rotation of the motor, thereby realizing the locking and unlocking process.

[0021] Furthermore, by rotating the manual lever externally, the limit can be manually controlled or canceled. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the installation of the bidirectional limit device of the present invention; Figure 2 It is a first cross-sectional view of the bidirectional restraining device of the freight system of the present invention; Figure 3 A second cross-sectional view of the bidirectional restraining device of the freight system of the present invention; Figure 4 It is an external view of the bidirectional restraining device of the freight system of the present invention; Figure 5 It is a first cross-sectional view of the bidirectional restraining device of the freight system of the present invention when it is unlocked; Figure 6 This is a second cross-sectional view of the bidirectional restraining device of the freight system of the present invention when it is unlocked.

[0023] Among them: 1-aircraft frame beam; 2-cargo tray; 3-bidirectional limit device; 4-rocker arm one; 5-rocker arm shaft; 6-key; 7-box body; 8-sleeve; 9-core shaft; 10-locking arm; 11-locking arm rear end surface; 12-locking arm front end surface; 13-shaft; 14-crossbeam; 15-rocker arm two; 16-limit pin; 17-V-shaped groove surface; 18-pin shaft; 19-connecting rod; 20-connecting rod shaft; 21-driven rod; 22-boss; 23-waist hole; 24-active rod boss; 25-active rod; 26-motor; 27-manual lever; 28-box cover; 29-arc surface. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms "installed", "connected", and "connected" 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 a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" used in this article includes any and all combinations of one or more related listed items. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0028] like Figure 1 As shown, the bidirectional limiting device of the cargo system of the present invention is provided. A plurality of cargo pallets 2 are placed in the aircraft by means of slide rails, and the cargo to be transported is fixed on the cargo pallets 2. The bidirectional limiting device 3 is installed on the aircraft frame beam 1 by means of bolts, and is located between two adjacent cargo pallets 2 in front and behind. The two cargo pallets 2 can be limited in heading and reverse heading at the same time. The heading limiting prevents the cargo pallets 2 from sliding toward the nose of the aircraft during deceleration or descent, and the reverse heading limiting prevents the cargo pallets 2 from sliding toward the tail of the aircraft during acceleration or ascent, thereby causing danger.

[0029] like Figure 2-4 As shown, the bidirectional limit device 3 described in the present invention drives the limit device to lock and unlock through the combination of the motor 26, the crank slider mechanism and the cam mechanism, which reduces the volume of the limit device, reduces the weight of the limit device, and improves the locking and unlocking speed of the limit device.

[0030] The two-way limiting device 3 includes a locking arm 10, a rotating shaft 13, a crossbeam 14, a rocker arm 1 4, a core shaft 9, a sleeve 8, a rocker arm rotating shaft 5, a rocker arm 2 15, a connecting rod 19, a pin 18, a connecting rod rotating shaft 20, a driven rod 21, an active rod 25, a box body 7, a box cover 28, a motor 26 and a manual lever 27.

[0031] The middle part of the lock arm 10 is rotatably connected to the inside of the box body 7, and the top of the lock arm 10 extends out from the top of the box body 7; the cross beam 14 is located on one side of the bottom of the lock arm 10, and the rocker arm shaft 5 is located on the other side of the bottom of the lock arm 10; The rocker arm shaft 5 and the connecting rod shaft 20 are both rotatably connected to the box body 7, and the rocker arm shaft 5 is fixedly connected to the end of the rocker arm 1 4 and the end of the rocker arm 2 15; the connecting rod shaft 20 is located obliquely above the rocker arm 2 15, and the connecting rod shaft 20 is fixedly connected to the middle part of the crank arm, the first end of the crank arm is in contact with the rocker arm 2 15, and the second end of the crank arm is connected to the motor 26; the boss 22 is fixed to the side of the first end of the crank arm away from the rocker arm 2 15; When limiting, the cross beam 14 fits one side of the bottom of the locking arm 10, the front end of the rocker arm 14 fits the other side of the bottom of the locking arm 10, the first end of the crank arm forms a point-to-surface contact with the front end face of the rocker arm 2 15, the normal of the first end of the crank arm is inclined toward the side away from the rocker arm 2 15, the first end of the crank arm has a tendency to rotate counterclockwise, and the side wall of the first end of the crank arm is in contact with the boss 22.

[0032] The specific arrangement of the above structure is as follows: The box body 7 is fixedly connected to the aircraft frame beam 1 on the aircraft, and is used for fixing the entire device and installing parts. The box cover 28 is located on the front end surface of the box body 7. After the two are installed, a cavity is formed inside for the internal parts to work.

[0033] like Figure 2 As shown, the locking arm 10 is installed on the box body 7 through the rotating shaft 13 and can rotate freely. The top of the locking arm 10 extends from the top of the box body 7 and vertically upward. One side of the locking arm 10 is the front end face 12 of the locking arm, which is used to limit the movement of the pallet 2 in front, and the other side is the rear end face 11 of the locking arm, which is used to limit the movement of the pallet 2 in the rear. The bottom of the locking arm 10 is an arc surface.

[0034] The cross beam 14 is installed in the through hole on the right side of the box body 7, and is located on the bottom side of the front end surface 12 of the locking arm. When the locking arm 10 is in a vertical state, the bottom side of the locking arm 10 contacts the cross beam 14, which is used to limit the locking arm 10 from rotating counterclockwise to achieve heading limit.

[0035] The rocker arm 4 is installed in the box body 7 through the rocker arm shaft 5, and the end of the rocker arm 4 is connected to the rocker arm shaft 5 through a key 6, so that the rocker arm 4 and the rocker arm shaft 5 rotate synchronously.

[0036] The shaft sleeve 8 is installed in the groove at the front end of the rocker arm 4 through the core shaft 9. The shaft sleeve 8 can rotate around the core shaft 9. The shaft sleeve 8 fits the lower end side of the rear end surface 11 of the locking arm to keep the locking arm 10 in a vertical state, which is used to limit the locking arm 10 to rotate clockwise and achieve reverse course limit. After the limit is cancelled, the shaft sleeve 8 fits the arc surface at the bottom of the locking arm 10 to facilitate re-limiting.

[0037] A limit pin 16 is provided in the box body 7, and the limit pin is located above the rocker arm shaft 5. After the limit is cancelled, the rocker arm 4 rotates counterclockwise to the limit pin 16 and stops rotating to facilitate returning to the limit position.

[0038] like Figure 3 As shown, rocker arm 2 15 is installed in the box body 7, and the end of rocker arm 2 15 is connected to the rocker arm shaft 5 through key 6, and rocker arm 2 15 rotates synchronously with rocker arm 1 4 through the rocker arm shaft 5.

[0039] The connecting rod shaft 20 is located obliquely above the rocker arm 15, and the two ends of the connecting rod shaft 20 are installed in the holes of the box body 7 and the box cover 28 to form a revolving pair, so that the connecting rod shaft 20 can rotate relative to the box body 7 and the box cover 28.

[0040] The connecting rod 19 and the driven rod 21 can be the same part, and a crank arm can be directly used, with the connecting rod 19 as the first end of the crank arm and the driven rod 21 as the second end of the crank arm. The connecting rod 19 and the driven rod 21 can also be two parts.

[0041] In this embodiment, the crank arm adopts a connecting rod 19 and a driven rod 21, and the connecting rod 19 and the driven rod 21 are installed between the box body 7 and the box cover 28 through a connecting rod shaft 20. The connecting rod 19, the driven rod 21 and the connecting rod shaft 20 are key-matched to achieve synchronous rotation of the three. The angle between the connecting rod 19 and the driven rod 21 is less than 180°, forming a crank arm structure.

[0042] The lower end of the connecting rod 19 is provided with a notch, and the pin 18 is installed in the notch at the lower end of the connecting rod 19, and the two ends are supported on both sides of the notch at the lower end of the connecting rod 19.

[0043] The front end of the rocker arm 2 15 is placed in the middle of the notch of the connecting rod 19, and the outer cylindrical surface of the pin 18 is pressed on the end surface of the front end of the rocker arm 2 15 to form a cam mechanism for limiting the counterclockwise rotation of the rocker arm 2 15 and the rocker arm 1 4.

[0044] When the front end face of the second rocker arm 15 contacts the pin 18 , the front end face is the tangent of the pin 18 , and the normal of the pin 18 is inclined to the right. At this time, the second rocker arm 15 squeezes the pin 18 to the right.

[0045] The rocker arm 15 is a crank structure with a V-shaped groove surface on the middle upper side. When the limit is cancelled, the rocker arm 15 rotates counterclockwise and the pin 18 is located in the V-shaped groove surface, which not only limits the rocker arm 15 in the counterclockwise direction, but also facilitates the rotation of the connecting rod 19 when locking, and drives the rocker arm 15 to rotate through the pin 18 until the end face of the front end of the rocker arm 15 contacts the pin 18, thereby realizing automatic locking.

[0046] A boss 22 is provided in the box body 7 , and the boss 22 is located on the right side of the connecting rod 19 , that is, on the side away from the rocker arm 15 . The side wall of the connecting rod 19 contacts the boss 22 , so as to limit the connecting rod 19 .

[0047] The motor 26 is installed in the box body 7 , the end of the active rod 25 is vertically fixed to the output shaft of the motor 26 , and the front end of the active rod 25 is provided with an active rod boss 24 .

[0048] The active rod boss 24 is slidably connected in the waist-shaped hole 23 of the driven rod 21 and contacts two side surfaces of the waist-shaped hole 23 to form a crank slider mechanism.

[0049] like Figure 4 As shown, the manual lever 27 is installed on the outside of the box cover 28 through the connecting rod shaft 20. By rotating the manual lever 27 externally, the limit can be manually controlled or cancelled.

[0050] The box body 7 and the box cover 28 can be connected together by screws, or can be an integrally processed part.

[0051] When the heading is limited, the cargo pallet 2 is pressed against the upper end of the front end surface 12 of the locking arm, and the bottom end side surface of the front end surface 12 of the locking arm presses against the crossbeam 14 to prevent the locking arm 10 from rotating counterclockwise, thereby achieving the heading limit of the cargo pallet 2.

[0052] When limiting the movement in the reverse direction, the cargo pallet 2 is against the upper end of the rear end surface 11 of the locking arm, and the lower end of the rear end surface 11 of the locking arm is against the shaft sleeve 8. The shaft sleeve 8 drives the rocker arm 1 4 and the rocker arm 2 15 to rotate counterclockwise. The front end surface of the rocker arm 2 15 is against the pin 18. The front end surface is the tangent of the pin 18, and the normal of the pin 18 is inclined to the right. Therefore, the rocker arm 2 15 squeezes the pin 18 to the right, thereby driving the connecting rod 19 to rotate counterclockwise. The side wall of the connecting rod 19 contacts the boss 22 in the box body 7. The boss 22 limits the connecting rod 19 from continuing to rotate counterclockwise, so that the rocker arm 1 4 and the rocker arm 2 15 remain fixed, thereby realizing the reverse direction limiting of the cargo pallet 2.

[0053] like Figure 5 and Figure 6 As shown, when the pallet 2 is released, the manual lever 27 or the motor 26 is powered on and rotated, and the active rod boss 24 drives the driven rod 21, thereby driving the driven rod 21 and the connecting rod 19 to rotate clockwise, and the end face of the rocker arm 15 loses support and rotates counterclockwise under the action of the thrust of the pallet 2, and the locking arm 10 lies flat, thereby realizing the release of the pallet 2.

[0054] When locking, the motor 26 is energized and rotates clockwise, the active rod boss 24 drives the driven rod 21, and drives the driven rod 21 and the connecting rod 19 to rotate counterclockwise, the pin 18 drives the rocker arm 2 15 to rotate clockwise through the V-shaped groove surface 17, drives the rocker arm 1 4 and the sleeve 8 to rotate clockwise, and the sleeve 8 squeezes the arc surface 29 at the bottom of the locking arm to rotate counterclockwise until the locking arm 10 is completely upright and locked.

[0055] The two-way stopper 3 can automatically lock and unlock the pallet 2 without manual operation, greatly improving the loading and unloading efficiency. This automatic feature reduces the possibility of human error and reduces the labor intensity of operators.

[0056] By integrating with the aircraft cargo system, the bidirectional limiting device 3 can realize intelligent control and automatically adjust the locking state according to the position and state of the cargo pallet 2 to ensure the stability and safety of the cargo pallet 2 during transportation.

[0057] The two-way stopper 3 can firmly lock the cargo pallet 2 to prevent it from moving or tilting during flight, thereby protecting the safety of the cargo and the aircraft. This stability is essential to ensure the integrity of the cargo and prevent accidents. Whether it is short-distance transportation or long-distance flight, the two-way stopper 3 can provide a stable locking effect to meet various transportation needs.

[0058] The bidirectional stopper 3 of the present invention generally adopts a simple structural design, making maintenance and servicing relatively simple. When parts need to be replaced or repaired, the design of the bidirectional stopper 3 allows these tasks to be completed quickly and efficiently, reducing downtime and maintenance costs. The bidirectional stopper 3 generally has lower energy consumption during operation, which helps to reduce energy consumption and reduce operating costs.

[0059] Compared with the traditional mechanical limiting device, the bidirectional limiting device 3 generates lower noise during operation, which helps to improve the working environment and reduce noise pollution.

[0060] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0061] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A two-way limiting device for a freight system, characterized in that: It comprises a box body (7), a locking arm (10), a crossbeam (14), a boss (22), a rocker arm rotating shaft (5) and a connecting rod rotating shaft (20); The middle part of the locking arm (10) is rotatably connected to the inside of the box body (7), and the top of the locking arm (10) extends out from the top of the box body (7); the crossbeam (14) is located on one side of the bottom of the locking arm (10), and the rocker arm shaft (5) is located on the other side of the bottom of the locking arm (10); The rocker arm shaft (5) and the connecting rod shaft (20) are both rotatably connected to the box body (7); the rocker arm shaft (5) is fixedly connected to the end of the first rocker arm (4) and the end of the second rocker arm (15); the connecting rod shaft (20) is located obliquely above the second rocker arm (15); the connecting rod shaft (20) is fixedly connected to the middle of the crank arm; the first end of the crank arm contacts the second rocker arm (15); and the second end of the crank arm is connected to the motor (26); the boss (22) is fixed to a side of the first end of the crank arm away from the second rocker arm (15); When limiting, the cross beam (14) fits one side of the bottom of the locking arm (10), the front end of the first rocker arm (4) fits the other side of the bottom of the locking arm (10), the first end of the crank arm forms point-surface contact with the front end face of the second rocker arm (15), the normal of the first end of the crank arm is inclined toward the side away from the second rocker arm (15), the first end of the crank arm has a counterclockwise rotation tendency, and the side wall of the first end of the crank arm contacts the boss (22).

2. The two-way restraining device for a cargo system according to claim 1, characterized in that: A core shaft (9) is arranged at the front end of the rocker arm 1 (4), and a shaft sleeve (8) is rotatably connected to the outside of the core shaft (9).

3. The two-way limiting device for a cargo system according to claim 2, characterized in that: The bottom of the locking arm (10) is provided with an arc surface.

4. The two-way restraining device for a cargo system according to claim 1, characterized in that: A limit pin (16) is arranged in the box body (7), and the limit pin is located above the rocker arm rotating shaft (5).

5. The two-way restraining device for a cargo system according to claim 1, characterized in that: A notch is formed at the first end of the rocker arm, a pin shaft (18) is installed in the notch, and a front end surface of the second rocker arm (15) contacts the pin shaft (18).

6. The two-way restraining device for a cargo system according to claim 1, characterized in that: A V-shaped groove surface is provided on the middle upper side of the rocker arm 2 (15).

7. The two-way restraining device for a cargo system according to claim 1, characterized in that: The end of the active rod (25) is vertically fixedly connected to the output shaft of the motor (26), the front end of the active rod (25) is provided with an active rod boss (24), the second end of the crank arm is provided with a waist-shaped hole (23), and the active rod boss (24) is slidably connected in the waist-shaped hole (23).

8. The two-way restraining device for a cargo system according to claim 1, characterized in that: The connecting rod rotating shaft (20) extends out of the box body (7) and is connected to a manual lever (27) outside.

9. A limiting method for the bidirectional limiting device of a freight system according to any one of claims 1 to 8, characterized in that: When the heading is limited, the cargo pallet (2) is pressed against the upper end of the front end surface (12) of the locking arm, and the lower end side surface of the front end surface (12) of the locking arm presses against the crossbeam (14), thereby preventing the locking arm (10) from rotating counterclockwise, thereby achieving heading limitation of the cargo pallet (2); When limiting the movement in the reverse direction, the cargo pallet (2) is pressed against the upper end of the rear end surface (11) of the locking arm, and the lower end of the rear end surface (11) of the locking arm presses against the front end of the rocker arm 1 (4), driving the rocker arm 1 (4) and the rocker arm 2 (15) to rotate counterclockwise, and the front end surface of the rocker arm 2 (15) presses against the first end of the crank arm, and the first end of the crank arm rotates counterclockwise, and the side wall of the first end of the crank arm contacts the boss (22), and the boss (22) limits the first end of the crank arm from continuing to rotate counterclockwise, so that the rocker arm 1 (4) and the rocker arm 2 (15) remain fixed, thereby achieving the reverse direction limiting of the cargo pallet (2).

10. The limiting method of the bidirectional limiting device of the freight system according to claim 9, characterized in that: When the cargo pallet (2) is released, the manual lever (27) or the motor (26) is powered on and rotated, driving the crank arm to rotate clockwise, causing the end surface of the second rocker arm (15) to lose support and rotate counterclockwise under the thrust of the cargo pallet (2), causing the locking arm (10) to lie flat, thereby achieving the release of the cargo pallet (2).

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