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Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation

In recent years, the side curtain trailer has been gradually popularized because of its efficient loading and unloading advantages; However, for this new thing, some of our drivers still lack experience in operation and use, and there are often some non-standard operation and misoperation.
 
At the same time, our vehicle manufacturing enterprises still have some places that are not in place, unreasonable and humanized in vehicle design and manufacturing, which are regarded as small defects. These non-standard operation, misoperation and small defects eventually lead to the same result – vehicle damage, so the side curtain car is also branded as “not resistant to manufacturing”.
 
Combined with some common problems of side curtain car I met in practical work, this paper shares my understanding in order to attract jade.

"Rigidity" And "Softness" Of Side Curtain Car

The side and ceiling of the side curtain car are flexible structures, which determines that it is far less stable than the hard car, and the side curtain car will inevitably have large deformation during driving.
Some manufacturers try to use more support to limit the deformation of the carriage in order to make it “rigid”. However, it not only seriously increases the vehicle weight, but also the result is not ideal. As shown in the figure below, the frame of this side curtain car is not solid, and the welding is not solid, but it still can’t get rid of the fate of column fracture.
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation

Since the side curtain car is bound to deform, blindly seeking its “rigidity” will only “be too rigid and easy to fold”; If we blindly seek its “softness”, it must be “too soft and easy to bend”; Only the “combination of hardness and flexibility” can really solve the problem – allow its deformation, but effectively limit its deformation.

Curtains Are Not Just For Shelter

  • To limit the deformation of the car, the cord fabric is one of the core components. The cord fabric transversely tightens the front plate and rear door, longitudinally tightens the ceiling and floor, binds the carriage into a whole, and limits its deformation by using its low ductility. Therefore, making the cord fabric fully tensioned is the key to design, manufacture and subsequent operation.
  • common problem:
  • (1) The cord fabric is too long: the roller shutter rod at both ends of the cord fabric is stuck. Due to the needs of carriage design, the reserved space is often small; The operation space of the roller shutter rod is not much; Under normal circumstances, the cord fabric shall be fully tensioned within one revolution of the roller shutter rod.
  • If the cord fabric is too long, the roller shutter rod needs to rotate for many turns. When the cord fabric has not been tightened, the roller shutter rod will be stuck due to too much rolled cord fabric, so the cord fabric cannot be tightened.
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (2)

Unreasonable buckle hook position: the buckle plays the role of tightening the ceiling and floor. Generally, the buckle belt shall be parallel to the cord fabric and perpendicular to the floor; The buckle of some vehicles is designed to buckle on the inner side of the side beam, which is not only inconvenient to operate, but also seriously affects the longitudinal tension of the buckle.

Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (3)
(3) Insufficient fastening length of the buckle: the buckle needs enough stretching space to tighten the ceiling and floor. Some manufacturers configure the buckle close to the floor, resulting in insufficient stretching space, so it cannot be tensioned longitudinally.
(4) The cord fabric is not equipped with stiffeners: the role of stiffeners is not only to increase the strength of the cord fabric, but also the main measure to limit the ductility of the cord fabric. The cord fabric without stiffeners not only has insufficient strength, but also has excessive ductility, which can not effectively limit the deformation of the car.
(5) The clamping groove of the roller shutter rod fails to effectively support the roller shutter rod: after the cord fabric is tightened, the roller shutter rod bears great transverse tension; During driving, the centrifugal force of goods will also pull the roller shutter rod outward through the curtain cloth. If the roller shutter rod clamping groove fails to give sufficient support to the roller shutter rod, the roller shutter rod is easy to be pulled and bent, so that the cord fabric cannot be tightened.
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (4)
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (5)

Common Non-Standard Operation And Misoperation:

(1) The cord fabric is not tightened horizontally: the cord fabric tightener should try to tighten to the last step, but not tightly, if the cord fabric is flat.
(2) The cord fabric is not tightened longitudinally: the correct operation step is to place the buckle hook at the fastening position, tighten the buckle belt, and then lock the buckle. If the length of the buckle belt is not adjusted and the buckle is directly locked, it will inevitably lead to insufficient longitudinal tension.

After The Cord Fabric Is Longitudinally Tightened, The Head Of The Column Shall Closely Fit With The Guide Rail.

Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (6)
The above two situations will lead to the failure of the carriage to form a whole, and in case of light, it will lead to problems such as box expansion and excessive deformation; Seriously, it will damage the overall structure of the carriage and cause serious damage to the vehicle.
(3) Buckle unlocked: This is a very serious non-standard operation. Once the loaded goods are dumped and the cord fabric fails to provide sufficient side support, the goods will be thrown out of the carriage and cause injury to other traffic participants.
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (7)

The curtain fabric of side curtain car is not only used for wind and rain protection, but also an important structural component. Whether in the design and manufacturing process or in the actual operation, it is necessary to ensure that the cord fabric is fully tensioned horizontally and longitudinally.

Sliding Columns Are More Than Just Supporting The Ceiling

When the vehicle is running, the goods will inevitably impact the front wall, rear door and both sides of the carriage. The front wall and rear door have high strength due to their hard structure; Because the two sides are flexible structures, bearing the impact of goods requires the synergy of cord fabric, column, side baffle and the whole carriage, and the sliding column is the top priority.
An excellent column, in addition to having sufficient strength to support the impact of goods, should also have sufficient toughness to enable the side of the carriage to recover to the initial state when it is not stressed.
Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (8)

Common Problem:

(1) A column is suitable for a variety of carriages: different carriage structures need to match different sliding columns; However, some car manufacturers often adapt one column to all cars, resulting in the mismatch between the column and the slide rail; Either the internal width of the carriage cannot be maximized, or the column and the cord fabric rub against each other, and the cord fabric cannot be opened and closed normally.
 
 
 
This requires our car manufacturer to fully consider the utilization of the internal width of the car and the opening of the cord fabric in the car design, so as to select appropriate sliding columns.
 
(2) Inconsistent column height: due to the inevitable gravity deformation of the roof of the side curtain car, the inconsistent height inside the car often results in different sliding column heights in the same car. During assembly, the column height shall be adjusted to the appropriate height through the column height fine adjustment function.

Side Baffles Provide More Than Just Lateral Support

The side baffle connects the front wall, the rear door and the sliding column to form a complete frame structure, and cooperates with the cord fabric to provide side support for the carriage. But it also plays another important role – limiting the left and right swing of the sliding column.

Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation (10)

Common Problem:

(1) The side baffle is too short: since the side baffle needs to be disassembled frequently, enough installation clearance shall be reserved to facilitate disassembly; However, since the side baffle plays the role of limiting the shaking of the column, the gap should be as small as possible. Generally, the clearance between the two ends of the side baffle and the installation slot shall be within 5mm.

Is The Side Curtain Car Really Not Resistant To Construction Maybe There Is Something Wrong With Your Operation

(2) No side baffle: as mentioned above, the side baffle is one of the core components of lateral support. The side curtain car without side baffle will inevitably cause damage to the sliding column, which should be absolutely avoided.

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