JT/T 1284-2020Technical specification of low-floor semi-trailer (English PDF)

4.1 Basic requirements

4.1.1 The low-flat semi-trailer shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures.

4.1.2 The purchased parts and outsourcing parts shall comply with the relevant standards and be accompanied by the manufacturer's certificate. Only after the vehicle manufacturer's inspection is qualified use. All self-made parts can be used after passing the inspection.

4.1.3 The design and installation of the low-flat semi-trailer shall ensure reasonable matching with the semi-trailer tractor, reliable connection, and related gas, electricity and control use it should be safe and reliable.

4.1.4 The interchangeability of the mechanical connection between the semi-trailer tractor and the low-bed semi-trailer shall meet the requirements of GB/T.20070.

4.2 Main parameter requirements

4.2.1 The main dimensional parameters of the low-bed semi-trailer shall meet the requirements of Table 1.

4.2.2 The main quality parameters of the low-bed semi-trailer shall meet the requirements of Table 2.

4.3 Performance requirements

4.3.1 The braking performance of the special low-flat semi-trailer and the automobile train composed of it shall meet the requirements of GB 7258 and GB 12676.

4.3.2 The parking brake performance of the low-flat semi-trailer and the automobile train consisting of it shall comply with the 7 of GB 7258-2017.10.3 of Regulations.

4.3.3 When the low-plate special semi-trailer train is fully loaded, the lateral stability is tested at a test speed of 80km/h.

The amplification factor at the rear of the acceleration should not be greater than 1.5.

4.3.4 The low-flat semi-trailer truck runs 500m in a straight line on a flat and dry road at a speed of 30km/h under no-load conditions.

The maximum swing amplitude of the center of the rear axle of the semi-trailer relative to the center of the front axle of the semi-trailer tractor shall be no more than 100mm.

4.3.5 In the idling and static state of low-flat semi-trailer trucks and trains, the roll stability angle shall meet the requirements of GB 7258.

4.3.6 The average distance between failures in the driving reliability test of the low-flat semi-trailer shall not be less than 2,500 km.

4.4 Structural requirements

4.4.1 The special semi-trailer for low flatbed shall be equipped with No. 50 traction pin in accordance with GB/T 4606 and GB/T 15088.

4.4.2 Low-flat semi-trailers should be equipped with supporting devices that meet the requirements of GB/T 2677.

4.4.3 Low-flat semi-trailers should be equipped with axles that comply with JT/T 475.

4.4.4 The low-flat semi-trailer shall be equipped with a dual-pipe braking system with independent energy supply pipeline and control pipeline.

4.4.5 The pneumatic and electrical connections of the low-flat semi-trailer shall comply with JT/T 1178.The provisions of Chapter 8 of 2-2019.

4.4.6 The low-flat semi-trailer shall be equipped with a Class A anti-lock system that meets the requirements of GB/T 13594-2003.

4.4.7 The number, location, light color and minimum geometric visibility of the external lighting and light signal devices of the low-flat semi-trailer shall comply with GB 4785 the general requirements for external lighting and light signal devices should comply with GB 7258-2017 8.3.Provisions.

4.4.8.The reflective markings on the body of the low-flat semi-trailer and the marking plate at the rear of the vehicle shall comply with the 8 of GB 7258-2017.4.Provisions.

4.4.9 The side and rear lower protective devices of the low-level semi-trailer shall meet the requirements of GB 11567.

4.4.10.The anti-splash system of the low-platform semi-trailer shall meet the requirements of GB 3459.

4.4.11.The side beams on both sides of the low-flat semi-trailer shall be provided with securing points for the fixed load. The securing points should be evenly and symmetrically arranged, and each side the number of securing points should be no less than four, and the load-bearing tensile force of a single securing point should not be less than 100kN.

4.4.12.The projection point of the center of the traction pin of the low flat semi-trailer on the horizontal plane and the center of the left and right wheels of the first axle of the semi-trailer on the horizontal plane the distance difference between points should be no more than 3mm; the distance between the left and right wheel centers between adjacent axles should be no more than 2mm.

4.4.13.The low-flat semi-trailer should be equipped with a climbing ladder, and the climbing ladder should be able to be fixed firmly after being folded; after the climbing ladder bears the design load, the components are not Permanent deformation or cracks should occur.

4.4.14.The load-bearing surface and ladder surface of the low-flat semi-trailer shall be provided with anti-skid strips.

4.4.15.The low-flat semi-trailer shall be equipped with a tool box and spare tires. The spare tires shall be firmly fixed and convenient for loading and unloading.

4.5 Process requirements

4.5.1 The welding quality of welded parts should meet the requirements of JB/T 5943, and the welds should be flat and even, free of weld penetration, missing welds, cracks, pores, slag inclusions and other defects.

4.5.2 The paint coating shall meet the requirements of QC/T 484.

4.5.3 All connecting parts and fasteners should be treated with anti-rust on the surface, and the connecting parts should be firm and reliable, and comply with the requirements of QC/T 518 the tightening torque requirements.

4.5.4 The surface of the whole vehicle should be free of rust, sharp edges and corners that affect personal safety, and no obvious unevenness. The surface of the metal coating and oxide layer should not be peeled off.

Falling or rusting.

4.5.5 The riveting should be firm, the rivets should be arranged neatly, the rivet heads should not be cracked, deviated, or incomplete, and there should be no gaps between the rivet heads and the metal bonding surface.

Should be less than or equal to 0.1mm.

4.5.6 The grease (oil) nipple of each part should be fully assembled and function effective; each movable joint and friction contact surface should be lubricated according to regulations Fat (oil).

4.5.7 The pipelines should be firmly fixed, cables should be bundled together, pipelines and wiring harnesses should not be in contact with moving parts, and protective measures should be taken.

5.1 Special structure requirements

5.1.1 The low-flat reinforced semi-trailer shall be equipped with No. 90 A traction pin in accordance with GB/T 4607 and GB/T 15088.

It is equipped with No. 50 A-type traction pin that can be interchanged, matched and installed with it and meets the relevant regulations of GB/T 4606 and GB/T 15088.

5.1.2 The main load-bearing components such as the longitudinal beams and load-bearing panel beams of the low-flat reinforced semi-trailer should adopt a yield strength greater than 700 MPa of high-strength steel.

5.1.3 In front of the first axle of the three-axle state of the variable five-axle and low-flat reinforced semi-trailer, there should be a mechanical connection with two additional axles.

Port and corresponding braking device and interface.

5.1.4 The pre-installed axles of the variable five-axle low-platen reinforced semi-trailer should be made into a two-axle group, and equipped with the same specifications and models as the three-axle state.

The same components, and each axle must be equipped with mechanical connection interfaces and brake pipeline interfaces corresponding to the three-axis state of the car body.

5.1.5 Both sides of the rear of the frame of the low-flat reinforced semi-trailer shall be equipped with a retractable and height-adjustable auxiliary outrigger, and shall not affect the vehicle.

Vehicle trafficability. The static load design bearing capacity of each auxiliary leg should not be less than 150kN.

5.1.6 The low-flat reinforced semi-trailer shall be equipped with devices (equipment), tools, accessories, etc. that extend the width of the load-bearing surface.

5.1.7 The center distance of the ladders on both sides of the low-flat reinforced semi-trailer should be able to adapt to the change in the width of the load-bearing surface.

5.1.8.The side guards of the variable five-axle and low-plate reinforced semi-trailer shall adopt the front and rear segmented detachable structure.

5.1.9.The low-flat reinforced semi-trailer shall be equipped with detachable limit blocks on the front part of the load-bearing vehicle, and shall be marked on both sides of the vehicle body at easily visible positions

Note the position of the center of mass of the rated load in the two axle states.

5.1.10 The load-bearing surface of the low-flat reinforced semi-trailer should be equipped with a sinking twist lock device for loading 20ft containers. The layout of the twist lock Installation and selection should comply with the requirements of GB/T 1413 and GB/T 1835.

5.1.11.The body color of the low-flat reinforced semi-trailer should be cyan gray or matt army green.

5.2 Special function requirements

5.2.1 After the expansion of the low-flat reinforced semi-trailer and the semi-trailer tractor, the minimum turning diameter of the car and train should not be greater than 30m.

The width should not be greater than 10m.

5.2.2 The maximum speed of the low-flat reinforced semi-trailer truck under full load conditions should not be greater than 60km/h.

5.2.3 Under the condition of full load of the low-flat reinforced semi-trailer vehicle, the braking distance should be no more than 14m at an initial speed of 30km/h.

5.2.4 The variable five-axle low-flatbed enhanced semi-trailer is converted from the three-axle state to the five-axle state, or the five-axle state is converted to the three-axle state.

With the assistance of heavy machinery (including operators), the time for two trained operators to complete the state transition should be no more than 90 minutes.

5.2.5 For the low-bed reinforced semi-trailer, two trained operators will extend (recover) the load-bearing surface to the maximum (minimum) limit.

The total time for setting and climbing the ladder to expand (collapse) and auxiliary legs to expand (collapse) should not exceed 30 minutes.

5.2.6 When loading and unloading special large objects that cannot be dismantled by the low-flat reinforced semi-trailer vehicle, the vehicle and train should not be longitudinally displaced and climb the ladder.

And the auxiliary outriggers should not fail.

6.1 General inspection

6.1.1 Visually inspect technical documents such as design documents and drawings, as well as traction pins, supporting devices, axles, pneumatic brake pipe connectors, and pneumatic and electrical connections such as inspection reports and certificates of purchased parts, outsourcing parts, and self-made parts.

6.1.2 Low-flat semi-trailer profile size, load-bearing surface height, horizontal distance from the central axis of the tow pin to the rear end of the vehicle length, mechanical connection the interchangeable dimensions shall be carried out in accordance with the relevant regulations of GB 1589 and GB/T 2678.

6.1.3 Park the low-flat semi-trailer on a level road, unfold the ladder, and use an angle measuring tool to measure at least 3 on each side of the ladder after unfolding.

The angle of each measurement position, the maximum value is the angle between the ladder and the ground; use the length measuring tool to measure the width of the ladder, and the measurement position on each side is not less than 3 the minimum width of all measuring positions is the ladder width.

6.1.4 The measurement of the curb weight of the low flat semi-trailer shall be carried out in accordance with the relevant regulations of GB/T 13873.

6.1.5 The test of the external lighting and optical signal device of the low-flat semi-trailer shall be carried out in accordance with the provisions of GB 4785.The external lighting and optical signal device shall be the general requirements test and the test of the reflective marking of the vehicle body and the tail marking plate of the vehicle shall be carried out in accordance with the provisions of GB 7258.

6.1.6 The inspection of the side and rear lower protective devices and the anti-splash system of the low-flat semi-trailer shall be in accordance with the regulations of GB 11567 and GB 3459.

Definitely proceed.

6.1.7 Visually check the number of securing points for the low-level semi-trailer. Choose one of the securing points with the same structure and the same installation method.

After performing the following strength tests on the securing point, visually inspect the securing point and the connecting parts for permanent deformation or cracks.

a) Apply a pull force of 125kN vertically upwards to the securing point (assisted fixing measures can be taken for the semi-trailer body) for 5min, and then release;

b) In the vertical plane where the rotation axis of the securing point is located, apply a tensile force of 125kN to the front and rear 45° directions of the securing point in steps (the front the end securing point only needs to be applied 45° backward, and the end securing point only needs to be applied 45° forward) for 5 minutes, then release.

6.1.8 The projection point of the center of the traction pin of the low-flat semi-trailer on the horizontal plane and the projection point of the center of the left and right wheels of the first axle of the semi-trailer on the horizontal plane the measurement of the distance difference between adjacent axles and the distance between the left and right wheel centers of adjacent axles shall be carried out in accordance with the regulations of JT/T 885.

6.1.9 Park the low-flat semi-trailer on a level road, unfold the climbing ladder and auxiliary outriggers, and apply evenly on the climbing ladder. 25 times design load the quality will be released after 5min. Visually inspect the components for permanent deformation or cracks; gather up the ladder and auxiliary outriggers and visually inspect the solid Set the situation.

6.1.10.Visually inspect and operate the installation of the spare tire; visually inspect the toolbox; visually inspect the anti-skid strips of the climbing ladder and the load-bearing surface; visually check low the flatbed reinforced semi-trailer carries the front limit block and the center of mass of the concentrated load.

6.1.11.Quality requirements for welded joints of low-flat semi-trailer, paint coating quality requirements, paint film color difference and tightening torque of fastening bolts the inspection is in accordance with JB/T 5943, QC/T 484, JB/T 9832.1.The relevant requirements in QC/T 518 shall be carried out.

6.1.12.Visually inspect the surface, coating, rivets, color of the entire vehicle, as well as the pipeline, cable arrangement and grease (oil) filling.

6.1.13 Visually inspect the pre-installed interface of the variable five-axle low-flat reinforced semi-trailer, the interface of the pre-installed axle, and the side guards Sectional detachable structure.

6.2 Performance test

6.2.1 The braking performance and parking brake performance test of the low-flat semi-trailer and the cars and trains composed of it are in accordance with GB 7258 and GB the provisions of 12676 are carried out.

6.2.2 The test of static safety items such as air-brake system sealing and brake coordination of low-flat semi-trailer shall be in accordance with the regulations of JT/T 885 get on.

6.2.3 The rear amplification factor test of the lateral acceleration of the low-flat semi-trailer vehicle (meeting the maximum external dimension of the enterprise product design) Carried out in accordance with the single-lane change test method specified in GB/T 2597.The test vehicle speed is 80km/h.

6.2.4 The channel circle, swing value and low-flat semi-trailer of the low-flat semi-trailer vehicle (meet the maximum external size of the enterprise product design) the inspection of the maximum swing amplitude of the center of the rear axle relative to the center of the front axle of the tractor-trailer shall be in accordance with the relevant regulations of GB 1589 and GB/T 2678 get on.

6.2.5 Low-flat semi-trailer trucks and trains (simulating devices can be used to replace semi-trailer tractors). Bench test of roll stability in accordance with GB/T the provisions of 14172 are carried out.

6.2.6 The driving reliability test of the low-flat semi-trailer shall be carried out in accordance with the provisions of GB/T 23336.

6.2.7 The anti-lock system test of the low-flat semi-trailer and the automobile train composed of it shall be carried out in accordance with the provisions of GB/T 13594.

6.2.8 The minimum turning diameter test of the low-flat reinforced semi-trailer train (meeting the maximum external dimension of the company's product design) GB/T 12540 regulations are carried out.

6.3 Special operation test

6.3.1 During the operation test of axle installation (removal), place the pre-installed axle equipped with the variable five-axle low-flatbed reinforced semi-trailer on the semi-trailer in front of the gooseneck, start timing. Two trained operators, with the cooperation of the hoisting machinery (including the operator), follow the requirements of the product manual.

Move the pre-installed axle to below the connection position at the bottom of the semi-trailer frame, and align the mechanical system and gas system on the pre-installed axle with the semi-trailer.

Should be connected to the interface, after the installation is completed, stop the timing, record the corresp...