A new type of midship axis refrigeration train

Abstract

This utility model relates to a novel center-axle refrigerated train, belonging to the field of transport vehicles. It includes a tractor unit, a center-axle trailer unit, and a coupling assembly between the two. The tractor unit has a first hydraulic tailgate assembly at the rear of its chassis, and a drawbar coupler in the coupling assembly is located at the rear end of the chassis. The center-axle trailer unit includes a trailer chassis with a rear cargo box mounted on it. The trailer chassis is connected to a drawbar in the coupling assembly, and the drawbar is telescopic. A second hydraulic tailgate assembly is located at the rear of the trailer chassis. The drawbar is connected to a locking control circuit. The length of the telescopic drawbar can be adjusted via a control switch in the driver's cab of the tractor unit, allowing the tailgate of the tractor unit to be laid flat. With the tailgate flat, the front and rear cargo boxes are connected, facilitating cargo flow between them and enabling loading and unloading without separating the two vehicles. This benefits the express delivery and logistics industry, improving the utilization rate of personnel and vehicles.

Description

Technical Field

[0001] This utility model relates to the field of center-axle automobiles, and more particularly to a novel center-axle refrigerated train. Background Technology

[0002] Center-axle trains are a common mode of transport in the industry, with common forms including flatbed center-axle and boxcar center-axle. Taking the common boxcar center-axle train as an example, the front and rear carriages are usually independent, and the front and rear carriages must be separated to load goods onto the front carriage. Connecting and disconnecting the front and rear carriages usually requires multiple people to work together, which poses certain safety hazards, is time-consuming and labor-intensive, and affects the efficiency of loading and unloading goods. Patent CN202022652333.6 provides a solution of setting a transition ramp between the front and rear carriages to facilitate cargo loading. However, prior art document 1 requires the center-axle train and the transition ramp to be compatible with each other so that the transition ramp adapts to the distance between the front and rear carriages of the center-axle train. This needs to be set manually, and the use of a cable tie during operation is ineffective and prone to collisions with the carriages. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a novel center-axle refrigerated train.

[0004] In a first aspect, this utility model provides a novel center-axle refrigerated train, comprising: a tractor unit, a center-axle trailer unit, and a coupling assembly between the two; The tractor unit includes: a tractor chassis, a cab at the front end of the tractor chassis, a front cargo box on the tractor chassis, a first hydraulic tailgate assembly at the rear end of the tractor chassis, a drawbar coupler in a coupling assembly at the rear end of the tractor chassis, and a front refrigeration unit connected to the front cargo box. The center-axle trailer includes: a trailer chassis, a rear cargo box mounted on the trailer chassis, a drawbar connected to the trailer chassis in a coupling assembly, the drawbar being a telescopic structure; a rear refrigeration unit mounted on the trailer chassis, the rear cargo box being connected to the rear refrigeration unit; and a second hydraulic tailgate assembly mounted at the rear of the trailer chassis. The traction rod is connected to the locking control circuit.

[0005] Furthermore, the first hydraulic tailgate assembly includes: two first hydraulic telescopic rods, two second hydraulic telescopic rods, a tailgate adjusting frame, two first hinge seats, two second hinge seats, and a tailgate; wherein, one end of each of the two first hydraulic telescopic rods is hinged to the tractor chassis, and the other end of each of the two first hydraulic telescopic rods is hinged to the tailgate adjusting frame; the tailgate adjusting frame includes two hook-shaped side plates and a connecting rod disposed between the two hook-shaped side plates; one end of each of the two hook-shaped side plates is hinged to the tractor chassis, and the other end of each of the two hook-shaped side plates is respectively hinged to the two first hinge seats on the tailgate; the other end of each of the two first hydraulic telescopic rods is hinged to the middle of the hook-shaped side plates; one end of each of the two second hydraulic telescopic rods is hinged to the tractor chassis; and the other end of each of the two second hydraulic telescopic rods is hinged to the two second hinge seats on the tailgate.

[0006] Furthermore, the front and rear of the rear compartment are equipped with front and rear door panels respectively, allowing for cargo flow between the front and rear compartments by opening the rear door panel of the front compartment and the front and rear door panels of the rear compartment.

[0007] Furthermore, a front refrigeration unit is connected to the front cargo box; a rear refrigeration unit is installed on the trailer chassis, and the rear cargo box is connected to the rear refrigeration unit.

[0008] Furthermore, the traction rod in the coupling assembly includes: a traction ring for coupling the traction rod coupler, a telescopic traction rod connected to the traction ring, a pneumatic pin on the telescopic traction rod for fixing the extension length of the telescopic traction rod, and a proximity switch on the pneumatic pin.

[0009] Furthermore, the tow bar coupler in the coupling assembly includes: a tow hook for coupling the tow bar, the tow hook being mounted on the chassis of the tractor vehicle, a first hard limit and a second hard limit being respectively mounted on both sides of the tow hook, a first limit switch and a second limit switch being respectively mounted on the first hard limit and the second hard limit, and the first limit switch and the second limit switch being connected to an alarm mounted in the cab.

[0010] Furthermore, the pneumatic pin is connected to a pneumatic pin air source or an external source via a first two-position three-way valve, and the first two-position three-way valve is electrically connected to the traction rod locking button; a pressure trigger is installed on the pipeline between the first two-position three-way valve and the pneumatic pin, and the pressure trigger is electrically connected to the coil of a relay to control the relay coil to go up and down, and the contacts of the relay are located between the traction rod locking button and the 24V power supply; the traction rod locking button and the reverse gear button are connected in series to the 24V power supply.

[0011] Furthermore, the brake air source is connected to the brake air chamber via a second two-position three-way valve; The movement of the pneumatic pin triggers a proximity switch, which is electrically connected to the coil of a five-pin relay, controlling the coil of the five-pin relay to be energized. The fixed contact of the five-pin relay is connected to a second two-position three-way valve. One movable fixed contact of the five-pin relay is connected to the traction rod locking button, and the other movable fixed contact of the five-pin relay is connected to the brake control power supply.

[0012] Furthermore, the fixed contacts of the five-pin relay are connected to the brake indicator light.

[0013] Furthermore, outriggers are provided at both the front and rear ends of the trailer chassis.

[0014] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art: When loading or unloading cargo, extend the tow bar, lower the tailgate, open the doors of the front and rear cargo compartments, and then raise the tailgate back above the floor of the front and rear cargo compartments. Reverse the vehicle and lower the tailgate of the first hydraulic tailgate assembly on the tractor unit, thus connecting the front and rear cargo compartments. To complete loading or unloading, simply reverse the process. This process allows for loading and unloading without detaching the front and rear vehicles, improving both efficiency and safety.

[0015] To prevent excessive turning angle of the center-axle trailer, which could cause the trailer's drawbar to press against the hydraulic cylinder of the tow truck's hydraulic tailgate and damage the hydraulic system, the drawbar coupler is equipped with a hard limit device and an alarm device to limit the turning angle of the center-axle trailer. The alarm device consists of a limit switch and an alarm. When the center-axle trailer reaches a certain turning angle with the tow truck, the drawbar triggers the limit switch, and the alarm sounds. The operator can then immediately adjust the train's turning angle to avoid vehicle damage caused by excessive turning.

[0016] When the drawbar needs to extend, the locking circuit restricts its extension. The tractor unit must be in reverse gear first, then the drawbar locking button must be pressed. This causes the pneumatic pin to pop out, putting the center-axle trailer in a braking state. The tractor unit can then pull the drawbar, extending the inner rod of the telescopic drawbar. The operating logic incorporates a fault-prevention measure: reversing must be engaged before pressing the drawbar locking button to trigger the starter pin, preventing accidental triggering of the drawbar locking button while the vehicle is traveling at high speed, which could lead to the vehicle locking up or the front and rear vehicles separating. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a novel center-axle refrigerated train provided for an embodiment of this utility model; Figure 2 A top view schematic diagram of the trailer portion is provided for an embodiment of this utility model; Figure 3 A side view schematic diagram of the trailer portion is provided for an embodiment of this utility model; Figure 4 A schematic diagram illustrating a novel center-axle refrigerated train in both transport and loading / unloading states, as provided in this embodiment of the utility model. Figure 5 A schematic diagram of the rear structure of the tractor unit provided in an embodiment of this utility model; Figure 6 A schematic diagram of the traction rod coupler at the rear of the tractor section provided in an embodiment of this utility model; Figure 7 A schematic diagram of the traction rod locking control circuit provided in an embodiment of this utility model.

[0020] The labels and their meanings in the diagram are as follows: 1. Driver's cab; 2. Front compartment; 3. Tractor chassis; 4. Towing rod coupler; 41. First hard limit switch; 42. Towing hook; 43. Second hard limit switch; 44. Second limit switch; 45. First limit switch; 46. Alarm. 5. First hydraulic tailplate assembly; 51. First hydraulic telescopic rod; 52. Second hydraulic telescopic rod; 53. Tailplate adjusting frame; 54. First hinge seat; 55. Second hinge seat; 56. Tailplate. 6. Trailer chassis; 61. Trailer chassis longitudinal beam; 62. Trailer chassis frame; 63. Trailer chassis crossbeam; 64. Axle; 65. Wheel; 66. Outrigger. 7. Towing rod; 71. Towing ring; 72. Telescopic towing rod; 73. Pneumatic pin; 74. Proximity switch; 75. Pressure trigger; 76. Pneumatic pin air source; 77. First and second position three-way valve; 78. Five-pin relay. 8. Rear compartment; 81. Rear refrigeration unit; 9. Second hydraulic tailgate assembly; 10. Brake air supply; 11. Second two-position three-way valve; 12. Brake chamber; 13. Reverse gear button; 14. Tow bar locking button; 15. Brake indicator light; 16. Plug-in connector; 17. Relay. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] See Figure 1 As shown, this utility model provides a novel center-axle refrigerated train, comprising: a tractor unit, a center-axle trailer unit, and a coupling assembly between the two; The tractor unit includes: a tractor chassis 3, a cab 1 at the front end of the tractor chassis 3, a front cargo box 2 on the tractor chassis 3, a first hydraulic tailgate assembly 5 at the rear end of the tractor chassis 3, and a drawbar coupler 4 in a coupling assembly at the rear end of the tractor chassis 3. In a specific implementation, a front refrigeration unit is connected to the front cargo box 2; a rear door panel is provided on the front cargo box 2.

[0024] like Figure 5As shown, the first hydraulic tailgate assembly 5, located at the rear of the tractor chassis 3, includes: two first hydraulic telescopic rods 51, two second hydraulic telescopic rods 52, a tailgate adjusting frame 53, two first hinge seats 54, two second hinge seats 55, and a tailgate 56. One end of each of the two first hydraulic telescopic rods 51 is hinged to the tractor chassis 3, and the other end is hinged to the tailgate adjusting frame 53. Specifically, the tailgate adjusting frame 53 includes two hook-shaped side plates and a connecting rod disposed between the two hook-shaped side plates. One end of each of the two hook-shaped side plates is hinged to the tractor chassis 3, and the other end is respectively hinged to the two first hinge seats 54 on the tailgate 56. The other ends of the two first hydraulic telescopic rods 51 are hinged to the middle of the hook-shaped side plates. One end of each of the two second hydraulic telescopic rods 52 is hinged to the tractor chassis 3; the other ends of each of the two second hydraulic telescopic rods 52 are hinged to the two second hinge seats 55 on the tailgate 56. The first hydraulic telescopic rod 51, the second hydraulic telescopic rod 52, and the tail plate adjusting frame 53 work together to control the retraction and extension of the tail plate 56. [1] Figure 4 As shown, during transportation, the tail plate of the first hydraulic tail plate assembly 5 is retracted and fits against the front compartment 2. During loading and unloading, the tail plate of the first hydraulic tail plate assembly 5 is lowered, forming a cargo loading and unloading channel between the front compartment 2 and the rear compartment 8.

[0025] like Figure 5 and Figure 6 As shown, the traction rod coupler 4 in the coupling assembly includes a traction hook 42 for coupling the traction ring 71. The traction hook 42 is mounted on the tractor chassis 3. A first hard limit 41 and a second hard limit 43 are respectively provided on both sides of the traction hook 42. A first limit switch 45 and a second limit switch 44 are respectively provided on the first hard limit 41 and the second hard limit 43. The first limit switch 45 and the second limit switch 44 are connected to an alarm 46. A hard limit device and an alarm device are installed at the rear end of the tractor chassis 3 to limit the turning angle of the center-axle trailer and avoid vehicle damage caused by excessive turning angle of the train.

[0026] The center-axle trailer includes: a trailer chassis 6, a rear cargo box 8 mounted on the trailer chassis 6, and a drawbar 7 connected to the trailer chassis 6 in a coupling assembly. The drawbar 7 is a telescopic structure. In a specific implementation, a rear refrigeration unit 81 is mounted on the trailer chassis 6, and the rear cargo box 8 is connected to the rear refrigeration unit. A second hydraulic tailgate assembly 9 is mounted at the rear of the trailer chassis 6. Both the tractor unit and the center-axle trailer are equipped with a hydraulic tailgate assembly. The second hydraulic tailgate assembly 9 mounted on the center-axle trailer is used for receiving and transferring goods at the loading dock. The first hydraulic tailgate assembly 5 mounted on the tractor unit is in a retracted (erected) state during vehicle operation. When the front cargo box 2 needs to be loaded or unloaded, the tailgate of the first hydraulic tailgate assembly 5 can be laid flat to connect the front and rear cargo boxes for cargo flow between them. The front and rear ends of the rear cargo box 8 are respectively equipped with front and rear doors. Opening the rear door of the front cargo box 2 and the front and rear doors of the rear cargo box 8 allows for cargo flow between the two vehicles.

[0027] Specific implementation plans, such as Figure 2 and Figure 3 As shown, the trailer chassis 6 includes: two sets of trailer chassis longitudinal beams 61, and several trailer chassis crossbeams 63 perpendicular to the trailer chassis longitudinal beams 61. The trailer chassis longitudinal and crossbeams are connected to the trailer chassis frame 62. Axles 64 are installed on the trailer chassis longitudinal beams, and wheels 65 are installed on the axles 64. Outriggers 66 are respectively installed at the front and rear ends of the trailer chassis 6.

[0028] In the specific implementation process, such as Figure 2 and Figure 3 As shown, the traction rod 7 in the coupling assembly includes: a traction ring 71 for coupling the traction rod coupler, a telescopic traction rod 72 connected to the traction ring 71, a pneumatic pin 73 provided on the telescopic traction rod 72, the pneumatic pin 73 being used to lock the extension length of the telescopic traction rod 72, and a proximity switch 74 provided on the pneumatic pin 73.

[0029] like Figure 7 As shown, the traction rod 7 is connected to the locking circuit.

[0030] Specifically, the pneumatic pin 73 is connected to a pneumatic pin air source 76 or an external source via a first two-position three-way valve 77. The first two-position three-way valve 77 is electrically connected to the traction rod locking button 14. The traction rod locking button 14 controls the energization and de-energization of the first two-position three-way valve 77 to charge and de-energize the pneumatic pin 73. A pressure trigger 75 is installed on the pipeline between the first two-position three-way valve 77 and the pneumatic pin 73. The pressure trigger 75 is electrically connected to the coil of the relay 17, controlling the energization and de-energization of the relay 17 coil. The contacts of the relay 17 are located between the traction rod locking button 14 and a 24V power supply. The traction rod locking button 14 is connected in series with the reverse gear button 13 and then connected to a 24V power supply. [2] In the specific implementation process, in order to avoid accidental activation and release of the tow bar 7 lock, press the reverse gear button 13 and then press the tow bar lock button 14 to enable the first two-position three-way valve 77 to connect the pneumatic pin air source and the pneumatic pin 73. The pneumatic pin 73 pops out to release the tow bar 7 lock. Then, the pressure trigger 75 triggers the relay 17 coil to be energized under the action of air pressure, so that the relay 17 provides 24V power to maintain the pneumatic pin popping out. At this time, in the non-reverse gear state, the tow bar 7 can be released from lock. The tractor part needs to move forward, and the center axle trailer part needs to brake, so that the tow bar 7 extends. To achieve this process, the pneumatic braking system of the center-axle trailer in this application is improved. The pneumatic braking system of the center-axle trailer includes a brake air source 10, a second two-position three-way valve 11, and a brake air chamber 12. The brake air chamber 12 is connected to the brake air source 10 or an external source via the second two-position three-way valve 11. The movement of the pneumatic pin 73 triggers a proximity switch 74. The proximity switch 74 is electrically connected to the coil of a five-pin relay 78, controlling the coil of the five-pin relay to be energized. The fixed contact of the five-pin relay 78 is connected to the second two-position three-way valve 11. One movable fixed contact of the five-pin relay 78 is connected to the tow bar locking button 14, and the other movable fixed contact of the five-pin relay 78 is connected to the brake control power supply.

[0031] The fixed contacts of the five-pin relay 78 are connected to the brake indicator light 15.

[0032] When the pneumatic pin 73 pops out, the proximity switch 74 controls the five-pin relay 78 to connect to the 24V power supply provided by the relay 17 and the tow bar locking button 14; when the pneumatic pin 73 inserts, the proximity switch 74 controls the five-pin relay 78 to connect to the brake control power supply. This enables automatic braking of the center-axle trailer when the tow bar 7 is released from locking. To extend the tow bar 7, the tractor unit must be in reverse gear, and then the tow bar locking button must be pressed. The pneumatic pin pops out, the center-axle trailer is in a braking state, and the tractor unit pulls the tow bar, extending the inner rod of the telescopic tow bar. The operating logic incorporates error prevention measures: reversing must be engaged first, and then the tow bar locking button must be pressed to pop out the starter pin, preventing accidental triggering of the tow bar locking button while the vehicle is traveling at high speed, which could cause the vehicle to lock up or the front and rear vehicles to separate.

[0033] In practice, in order to facilitate the connection of the wiring, a wiring connector 16 is provided between the tractor unit and the center-axle trailer unit.

[0034] In the several embodiments provided by this utility model, it should be understood that the disclosed modules and units can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between systems or units may be electrical, mechanical, or other forms.

[0035] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0036] In addition, in the various embodiments of this utility model, each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0037] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, it is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope of the claims.

Claims

1. A new type of midship axis refrigerated train, characterized in that, include: Tractor unit, center-axle trailer unit, and coupling assembly between the two; The tractor unit includes: a tractor chassis (3), a cab (1) is provided at the front end of the tractor chassis (3), a front cargo box (2) is provided on the tractor chassis (3), a first hydraulic tailgate assembly (5) is provided at the rear end of the tractor chassis (3), and a drawbar coupler (4) in the coupling assembly is provided at the rear end of the tractor chassis (3). The center-axle trailer includes: a trailer chassis (6), a rear cargo box (8) on the trailer chassis (6), a drawbar (7) in the coupling assembly connected to the trailer chassis (6), the drawbar (7) being a telescopic structure; and a second hydraulic tailgate assembly (9) at the rear of the trailer chassis (6). The traction rod (7) is connected to the locking circuit.

2. The new midship axis refrigerated train according to claim 1, characterized in that, The first hydraulic tailgate assembly (5) includes: two first hydraulic telescopic rods (51), two second hydraulic telescopic rods (52), a tailgate adjusting frame (53), two first hinge seats (54), two second hinge seats (55), and a tailgate (56); wherein, one end of the two first hydraulic telescopic rods (51) is hinged to the tractor chassis (3), and the other end of the two first hydraulic telescopic rods (51) is hinged to the tailgate adjusting frame (53); the tailgate adjusting frame (53) includes two hook-shaped side plates and a tailgate. A connecting rod is placed between two hook-shaped side plates; one end of each hook-shaped side plate is hinged to the tractor chassis (3), and the other end of each hook-shaped side plate is hinged to two first hinge seats (54) on the tail plate (56); the other end of each of the two first hydraulic telescopic rods (51) is hinged to the middle of the hook-shaped side plates; one end of each of the two second hydraulic telescopic rods (52) is hinged to the tractor chassis (3); the other end of each of the two second hydraulic telescopic rods (52) is hinged to two second hinge seats (55) on the tail plate (56).

3. The new midship axis refrigerated train according to claim 1, characterized in that, The front and rear of the rear compartment (8) are respectively equipped with front and rear door panels. Opening the rear door panel of the front compartment (2) and the front and rear door panels of the rear compartment (8) enables the flow of goods between the front and rear vehicles.

4. The new midship axis refrigerated train according to claim 1, characterized in that, The front compartment (2) is connected to the front refrigeration unit; the trailer chassis (6) is equipped with the rear refrigeration unit (81), and the rear compartment (8) is connected to the rear refrigeration unit (81).

5. The novel midship axis refrigerated train according to claim 1, characterized in that, The traction rod (7) in the coupling assembly includes: a traction ring (71) for coupling the traction rod coupler, a telescopic traction rod (72) connected to the traction ring (71), a pneumatic pin (73) provided on the telescopic traction rod (72), the pneumatic pin (73) being used to fix the extension length of the telescopic traction rod (72), and a proximity switch (74) provided on the pneumatic pin (73).

6. The new midship axis refrigerated train according to claim 1, characterized in that, The tow bar coupler (4) in the coupling assembly includes: a tow hook (42) for coupling the tow bar (7), the tow hook (42) is mounted on the chassis (3) of the tractor vehicle, and a first hard limit (41) and a second hard limit (43) are respectively provided on both sides of the tow hook (42), a first limit switch (45) and a second limit switch (44) are respectively provided on the first hard limit (41) and the second hard limit (43), and the first limit switch (45) and the second limit switch (44) are connected to an alarm (46).

7. The novel midship axis refrigerated train according to claim 5, characterized in that, The pneumatic pin (73) is connected to the pneumatic pin air source (76) or the outside via the first two-position three-way valve (77). The first two-position three-way valve (77) is electrically connected to the traction rod locking button (14). A pressure trigger (75) is installed on the pipeline between the first two-position three-way valve (77) and the pneumatic pin (73). The pressure trigger (75) is electrically connected to the coil of the relay (17) to control the relay coil to go up and down. The contacts of the relay (17) are located between the traction rod locking button (14) and the 24V power supply. The traction rod locking button (14) and the reverse gear button (13) are connected in series to the 24V power supply.

8. The novel midship axis refrigerated train according to claim 7, characterized in that The brake chamber (12) is connected to the brake air source (10) or the outside via the second two-position three-way valve (11); The movement of the pneumatic pin (73) triggers the proximity switch (74), which is electrically connected to the coil of the five-pin relay (78) to control the coil of the five-pin relay to be energized up and down. The fixed contact of the five-pin relay (78) is connected to the second two-position three-way valve (11). One movable fixed contact of the five-pin relay (78) is connected to the traction rod locking button (14), and the other movable fixed contact of the five-pin relay (78) is connected to the brake control power supply.

9. The novel midship axis refrigerated train according to claim 8, characterized in that The fixed contacts of the five-pin relay (78) are connected to the brake indicator light (15).

10. The new midship axis refrigerated train according to claim 1, characterized in that, Outriggers (66) are respectively installed at the front and rear ends of the trailer chassis (6).

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