CN202089109U - Steering system of three-bridge trailer - Google Patents
Steering system of three-bridge trailer Download PDFInfo
- Publication number
- CN202089109U CN202089109U CN2011202028446U CN201120202844U CN202089109U CN 202089109 U CN202089109 U CN 202089109U CN 2011202028446 U CN2011202028446 U CN 2011202028446U CN 201120202844 U CN201120202844 U CN 201120202844U CN 202089109 U CN202089109 U CN 202089109U
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- steering
- trailer
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Abstract
The utility model discloses a steering system of a three-bridge trailer, which comprises a hydraulic system and a steering mechanism. The hydraulic system controls the steering mechanism which controls wheel steering of the three-bridge trailer. The steering system further comprises a sensor system and a control system. The sensor system is used for sensing swerving angles of a traction car, installed on the steering mechanism and electrically connected with the control system. The control system is used for receiving signals of the sensor system and controlling the hydraulic system and comprises a center controller. The steering system of the three-bridge trailer is simple in structure and capable of achieving automatic swerving of the three-bridge trailer. The steering system has the advantages that 1 the trailer applies programmable logic controller technology and achieves automatic control with a hydraulic solenoid valve combination system; 2 two groups of steering bridges are connected with oil lines in series and the two groups of bridges steer synchronously; 3 a shaft head of each steering bridge is provided with a hinge, a thrust wheel can rotate for a certain angle around a pin shaft, so that transverse dragging during swerving can be reduced; 4 manual operation devices are arranged in a cab, so that a driver can conveniently conduct trailer meeting, trailer backing, warehouse moving and the like.
Description
Technical field
The utility model relates to load-carrying trailer and automation field, particularly relates to a kind of three bridge trailer steering swivel systems.
Background technology
Semi-dragging truck is the most desirable vehicle of " trailer dropped and picked up transportation ", " section transportation ", " roll shipment defeated ", has the good economic benefits of transportation efficiency, so transportation market increases day by day to the demand of superimposed trailer.Whole nation trailer manufacturer is about more than 220, has about 1,300 ten thousand in trailer.
It is external that trailer is more advanced at present, from more than 10 tons to nearly 200 tons whole supporting, the automatic steering bridge is used for the big-load trailer more than 100 tons more.And price is expensive to surprising, and the trailer of super-tonnage is limit by road and bridge etc. in China in addition, uses less at present.
In the operating cost of semi-dragging truck, Tyte Wear has occupied main portions according to investigations.If superimposed trailer is installed the automatic steering bridge, tire trend pure rolling then can reduce Tyte Wear effectively, simultaneously also reduce minimum turning radius and passage width, improved the crossing ability and the manoevreability of train, improved the reliability and the maintainability of superimposed trailer greatly.
The utility model content
The purpose of this utility model provides a kind of three bridge trailer steering swivel systems that can realize that three bridge trailers are turned automatically.
Three bridge trailer steering swivel systems of the present utility model, described three bridge trailer steering swivel systems are used to control turning to of tractor truck and three bridge trailers, comprise hydraulic efficiency pressure system, steering hardware, the described steering hardware of described HYDRAULIC CONTROL SYSTEM, described steering hardware is controlled the wheel steering of three bridge trailers, also comprises:
The sensor-based system that is used for the described tractor truck angle of turn of sensing, described sensor-based system is installed on the steering hardware, and described sensor-based system and control system are electrically connected;
Be used to receive the signal of described sensor-based system, and control the control system of described hydraulic efficiency pressure system, described control system comprises central control unit.
Three bridge trailer steering swivel systems of the present utility model, wherein, also comprise: supervisory system, be electrically connected with described central control unit, described supervisory system comprises first video heads, first monitoring device, second video heads, described first video heads is installed on the operator's compartment back upper place, and described first monitoring device is positioned at bridge instrumentation dish top, and described second video heads is installed on the described three bridge trailer afterbody frames.
Three bridge trailer steering swivel systems of the present utility model wherein, also comprise: electronic lock system and the described central control unit of controlling described steering hardware are electrically connected.
Three bridge trailer steering swivel systems of the present utility model, wherein, described sensor-based system comprises: be installed in the pressure sensor on the hydraulic distributing valve of rotating disk sensor, steeraxle position transduser and described hydraulic efficiency pressure system of manual sensor, described three bridge trailers and described tractor truck junction in the operator's compartment, described manual sensor, described rotating disk sensor, described pressure sensor, described steeraxle position transduser respectively with described central control unit electrical connection.
Three bridge trailer steering swivel systems of the present utility model, wherein, described hydraulic efficiency pressure system includes Hydraulic Pump, press fuel tank, the hydraulic electromagnetic valve module, 2 hydraulic rams, described hydraulic electromagnetic change valve assembled is on described hydraulic reservoir, described electromagnetic switch valve module comprises the valve body that surges, pressure sensor, electromagnetic valve body, the described valve body that surges, described pressure sensor, described electromagnetic valve body is by the bolted connection one, and the described valve body that surges is provided with the pipeline connector, by described pipeline connector, described surge valve body respectively with described hydraulic oil pump, described hydraulic reservoir connects, and described Hydraulic Pump connects the change speed gear box of described front haulage car.
Three bridge trailer steering swivel systems of the present utility model, wherein, described 2 hydraulic rams series connection is used, and the stop check valve is housed on first hydraulic ram, and hydraulic ram is installed on the cylinder bracket respectively.
Three bridge trailer steering swivel systems of the present utility model, wherein, the input end of described central control unit connects described manual sensor, described rotating disk sensor, described pressure sensor and described steeraxle position transduser, and the mouth of described central control unit produces electromagnetic switch valve module and the electronic lock system that the output control signal connects hydraulic efficiency pressure system.
Three bridge trailer steering swivel systems of the present utility model, wherein, described steering hardware comprises steeraxle, described steeraxle both sides are equipped with rotatable steering shaft, bearing wheel hub and tire are housed on the described steering shaft, be equipped with on the described wheel hub and turn to support arm, described hydraulic ram connects and turns to support arm, describedly turns to support arm to connect to turn to lateral connecting rod.
Three bridge trailer steering swivel systems of the present utility model, wherein, described electronic lock system comprises electromagnetism straight line lock, support ear of described tierod one end seam is used for connection and turns to oil cylinder, and the described oil cylinder other end that turns to connects cylinder bracket, and described cylinder bracket is welded on and turns on the pontic, described cylinder bracket upper bolt connects described electromagnetism straight line lock, in the described electromagnetism straight line lock movable straight pin is arranged, be provided with a hole in the middle of the described tierod, be the lock pin axis hole of described electromagnetism straight line lock.
Three bridge trailer steering swivel systems of the present utility model, wherein, described central control unit is the PLC controller.
Three bridge trailer steering swivel systems of the present utility model are simple in structure, can realize the automatic turning of three bridge trailers.
The utlity model has following beneficial effect:
1 trailer using PLC technology realizes automatic guidance with the hydraulic buttery valve group system;
2 liang of group steeraxle series connection oil circuits realize that two groups of bridges turn to synchronously;
3 steeraxle spindle noses are established hinge, and the caterpillar wheel bearing pin anglec of rotation of can having mercy on reduces when turning laterally dragging;
In 4 operator'ies compartment M/C is arranged, be convenient to the chaufeur meeting, move backward, move operations such as storehouse;
5 are provided with video monitor, and the first-class monitoring unit part of video is convenient to driver's observation trailer service condition.
Description of drawings
Fig. 1 is the front view that the structural representation of automatic steering trailer of the present utility model is installed;
Fig. 2 is the solenoid directional control valve front view that automatic steering trailer of the present utility model is installed;
Fig. 3 is the front view of steering swivel system of the present utility model;
Fig. 4 is of the present utility model walking around to the lateral plan of system;
Fig. 5 is a system schematic of the present utility model;
Fig. 6 installs automatic steering trailer front view of the present utility model;
Fig. 7 is the A-A view of Fig. 6;
Fig. 8 is the B partial enlarged drawing of Fig. 7;
Fig. 9 is a straight line lock scheme drawing of the present utility model.
Figure 10 is the scheme drawing of steering hardware of the present utility model
The specific embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present utility model is described in further detail.Following examples are used to illustrate the utility model, but are not used for limiting scope of the present utility model.
Three bridge trailer steering swivel systems of the present utility model, described three bridge trailer steering swivel systems are used to control turning to of tractor truck and three bridge trailers, comprise hydraulic efficiency pressure system, steering hardware, the described steering hardware of described HYDRAULIC CONTROL SYSTEM, described steering hardware is controlled the wheel steering of three bridge trailers, also comprises:
The sensor-based system that is used for the described tractor truck angle of turn of sensing, described sensor-based system is installed on the steering hardware, and described sensor-based system and control system are electrically connected;
Be used to receive the signal of described sensor-based system, and control the control system of described hydraulic efficiency pressure system, described control system comprises central control unit.
Three bridge trailer steering swivel systems of the present utility model, wherein, also comprise: supervisory system, be electrically connected with described central control unit, described supervisory system comprises first video heads, first monitoring device, second video heads, described first video heads is installed on the operator's compartment back upper place, and described first monitoring device is positioned at bridge instrumentation dish top, and described second video heads is installed on the described three bridge trailer afterbody frames.
Three bridge trailer steering swivel systems of the present utility model wherein, also comprise: electronic lock system and the described central control unit of controlling described steering hardware are electrically connected.
Three bridge trailer steering swivel systems of the present utility model, wherein, described sensor-based system comprises: be installed in the pressure sensor on the hydraulic distributing valve of rotating disk sensor, steeraxle position transduser and described hydraulic efficiency pressure system of manual sensor, described three bridge trailers and described tractor truck junction in the operator's compartment, described manual sensor, described rotating disk sensor, described pressure sensor, described steeraxle position transduser respectively with described central control unit electrical connection.
Three bridge trailer steering swivel systems of the present utility model, wherein, described hydraulic efficiency pressure system includes Hydraulic Pump, press fuel tank, the hydraulic electromagnetic valve module, 2 hydraulic rams, described hydraulic electromagnetic change valve assembled is on described hydraulic reservoir, described electromagnetic switch valve module comprises the valve body that surges, pressure sensor, electromagnetic valve body, the described valve body that surges, described pressure sensor, described electromagnetic valve body is by the bolted connection one, and the described valve body that surges is provided with the pipeline connector, by described pipeline connector, described surge valve body respectively with described hydraulic oil pump, described hydraulic reservoir connects, and described Hydraulic Pump connects the change speed gear box of described front haulage car
Three bridge trailer steering swivel systems of the present utility model, wherein, described 2 hydraulic rams series connection is used, and the stop check valve is housed on first hydraulic ram, and hydraulic ram is installed on the cylinder bracket respectively.
Three bridge trailer steering swivel systems of the present utility model, wherein, the input end of described central control unit connects described manual sensor, described rotating disk sensor, described pressure sensor and described steeraxle position transduser, and the mouth of described central control unit produces electromagnetic switch valve module and the electronic lock system that the output control signal connects hydraulic efficiency pressure system.
Three bridge trailer steering swivel systems of the present utility model, wherein, described steering hardware comprises steeraxle, described steeraxle both sides are equipped with rotatable steering shaft, bearing wheel hub and tire are housed on the described steering shaft, be equipped with on the described wheel hub and turn to support arm, described hydraulic ram connects and turns to support arm, describedly turns to support arm to connect to turn to lateral connecting rod.
Three bridge trailer steering swivel systems of the present utility model, wherein, described electronic lock system comprises electromagnetism straight line lock, support ear of described tierod one end seam is used for connection and turns to oil cylinder, and the described oil cylinder other end that turns to connects cylinder bracket, and described cylinder bracket is welded on and turns on the pontic, described cylinder bracket upper bolt connects described electromagnetism straight line lock, in the described electromagnetism straight line lock movable straight pin is arranged, be provided with a hole in the middle of the described tierod, be the lock pin axis hole of described electromagnetism straight line lock.
Three bridge trailer steering swivel systems of the present utility model, wherein, described central control unit is the PLC controller.See also shown in Figure 1ly, the trailer that three bridge trailer steering swivel systems of the present utility model are installed comprises: tractor truck assembly 1, trailer assembly 2, first steer axle assemble 3, the straight bridge 4 of trailer, second steeraxle 5.
See also shown in Figure 5ly, three bridge trailer steering swivel systems of the present utility model comprise control system, supervisory system, sensor-based system, electronic lock system, hydraulic efficiency pressure system and steering hardware.
Control system comprises: central control unit 11.
Supervisory system comprises first video heads 72, monitoring device 73, second video heads 78.First video heads 72 is installed on the operator's compartment back upper place.Monitoring device 73 is positioned at bridge instrumentation dish top.Second video heads 78 connects on the trailer afterbody frame
See also shown in Figure 2ly, hydraulic efficiency pressure system comprises hydraulic reservoir 44.Hydraulic reservoir 44 is installed on the chassis of trailer frame.Hydraulic electromagnetic change valve assembly 15 is assemblied on the hydraulic reservoir 44, and electromagnetic switch valve module 15 comprises the valve body 151 that surges, pressure sensor 152, electromagnetic valve body 153.The valve body 151 that surges, pressure sensor 152, electromagnetic valve body 153 be by the bolted connection one,
The valve body 151 that surges is provided with the pipeline connector, and by the pipeline connector, the valve body 151 that surges is connected with hydraulic oil pump 16, hydraulic reservoir 44 respectively.Hydraulic Pump 16 bolted connection change speed gear boxs, power is driven by change speed gear box.
See also Fig. 3, shown in Figure 4, steering hardware comprises rotating disk sensor stand 21, rotating disk sensor.
Rotating disk sensor stand 21 connects the rotating disk sensor and connects support cover for seat 29.Axis of traction 27 conical surfaces and axis of traction bearing 26 close fits will support cover for seat 29 lockings by axis of traction jam nut 23.Axis of traction bearing 26 is by traction seat support plate 24 and the seam of trailer frame.
Referring to Fig. 6-Fig. 8, sensor-based system comprises manual input pickup 12, wherein, and manually input pickup 12 is installed on by the operator's saddle in the operator's compartment.Sensor-based system comprises the pressure sensor on rotating disk sensor, steeraxle position transduser and the hydraulic distributing valve of trailer and tractor truck junction.
Sensor-based system comprises sensor straight-arm assembly 25.Sensor straight-arm assembly 25 comprises shading sensing dish 250 and center shaft 254.Shading sensing dish 250 and center shaft 254 weld togethers.Center shaft 254 other ends are connected with center shaft support arm 251 keys, center shaft support arm 251 and straight-arm ball hinge 252 bolted connections.Straight-arm ball hinge 252 and support arm adjustment rack 255 bolted connections are by adjusting the degree of advance that support arm adjustment rack 255 can be adjusted between shading sensing dish 250 and the rotating disk sensor 22.Straight-arm link span 253 is connected with tractor truck traction seat crab bolt.
See also Fig. 5, shown in Figure 10, tierod 31 two ends connect one respectively and turn to support arm 37.Being provided with holes in the middle of the tierod 31, is the lock pin axis hole of straight line lock 34, when need not to turn as trailer walking express highway or straight-line travelling the straight line lock can automatic lock on, promptly lock pin stretches into this hole.
Support ear of tierod 31 1 end seam is used for connection and turns to oil cylinder 36, turns to oil cylinder 36 other ends to connect cylinder bracket 35.Cylinder bracket 35 is welded on and turns on the pontic 39, and cylinder bracket 35 upper bolts connect straight line lock 34.Intermediate rod 31 sides also are welded with the anti-dazzle device in a plurality of holes, and steeraxle position transduser 32 is installed on the cylinder bracket, with the anti-dazzle device free-running fit.
Consult Fig. 9, straight line is locked 34 body skiies and is connected straight line lock pin 41, and lock pin bracing frame 42 is fixed between straight line lock body skin and the straight line lock pin.
Turn to pontic 39 two ends to be provided with the hinge pin-and-hole, steering shaft 38 is connected with steeraxle 39 by king pin 40.Turn to support arm 37 seam on the steering shaft on 38.Hanger bracket 33 and the seam of chassis of trailer frame.
Principle of work of the present utility model is: when main car is turned, the traction seat of tractor truck and towing pin generation corner, the rotating disk sensor is sent to central control unit with signal, central control unit sends the solenoid directional control valve executive command according to each sensor information, turns to oil cylinder to make steeraxle reach or right-hand rotation according to solenoid control.Manually input pickup is to be reversing or can wagon drill door design-calculated input media, chaufeur can before and after promote operating handle and the moving button of embedding and make steeraxle turn left to turn right or carry out.
Working process of the present utility model below is described in detail in detail:
When the trailer automatic transmission moved: manually the manual handle of input pickup was positioned at midway location (system makes zero, and the oil cylinder position sensor is a midway location, and steeraxle is for keeping straight on).Manual handle top automatic transmission button under the embedding, the straight line lock is opened.The automatic transmission control system is control mutually, tractor truck and trailer produce the phase angle at rotating disk traction bearing pin place during turning, automatic control component shading sensing dish and rotating disk sensor produce the phase angle synchronously, because the rotating disk sensor is the light sensation parts, shading sensing dish has through hole, send analog signal for respectively central controller LPC according to the corner difference, be transformed into digital signal by interface and give the PLC control system, PLC sends digital controlled signal according to programming control, become analog signal through interface conversion again, drive solenoid directional control valve through Darlington circuit, hydraulic efficiency pressure system is controlled by electromagnetic method, drives to turn to oil cylinder.Turn to the flexible pulling of oil cylinder tierod, drive again by intermediate rod and turn to support arm to realize that trailer turns to.The steeraxle position transduser also is installed on tierod, in the action of oil cylinder pulling tierod, relative position sensor also produces displacement, send the pulse simulation signal when reaching the shift length sensor photosensitive, issue the PLC danger signal through amplifying the A/D conversion instruction again, electromagnetic valve stops action.When trailer and tractor truck switched in opposite, so control signal is opposite, the oil cylinder effect is opposite, finishes the automatic guidance overall process.
When the manual operation of trailer: manual input pickup is positioned at midway location, and (system makes zero, the oil cylinder position sensor is craspedodrome for the midway location steeraxle), the manual button in manual handle top under the embedding, the straight line lock is opened, manually input pickup and automatic control component shading sensing dish and rotating disk sensor are basic identical, and principle is identical.When the handle midway location is an in-line position, both pushed ahead, both pulled back and turned right, promote the big more back axle of angle and rotate big more.Manually input pickup is the active analog signal, and the oil cylinder position sensor is a feedback control signal.
The principle of work of straight line lock: the manual manual handle of input pickup is positioned at midway location, and (system makes zero, the oil cylinder position sensor is craspedodrome for the midway location steeraxle), manual handle top straight line shelves button under the embedding, manually input pickup sends the straight-line travelling analog signal, drives electromagnetic valve straight line lock through Darlington circuit and closes.
Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineering staff in this area make the technical solution of the utility model all should fall in the definite protection domain of claims of the present utility model.
Claims (10)
1. bridge trailer steering swivel system, described three bridge trailer steering swivel systems are used to control turning to of tractor truck and three bridge trailers, comprise hydraulic efficiency pressure system, steering hardware, the described steering hardware of described HYDRAULIC CONTROL SYSTEM, described steering hardware is controlled the wheel steering of three bridge trailers, it is characterized in that, also comprise:
The sensor-based system that is used for the described tractor truck angle of turn of sensing, described sensor-based system is installed on the steering hardware, and described sensor-based system and control system are electrically connected;
Be used to receive the signal of described sensor-based system, and control the control system of described hydraulic efficiency pressure system, described control system comprises central control unit.
2. three bridge trailer steering swivel systems as claimed in claim 1 is characterized in that, also comprise: supervisory system and described central control unit are electrically connected; Described supervisory system comprises first video heads, first monitoring device, second video heads, described first video heads is installed on the operator's compartment back upper place, described first monitoring device is positioned at bridge instrumentation dish top, and described second video heads is installed on the described three bridge trailer afterbody frames.
3. three bridge trailer steering swivel systems as claimed in claim 2 is characterized in that, also comprise: electronic lock system and the described central control unit of controlling described steering hardware are electrically connected.
4. three bridge trailer steering swivel systems as claimed in claim 3, it is characterized in that, described sensor-based system comprises: be installed in the pressure sensor on the hydraulic distributing valve of rotating disk sensor, steeraxle position transduser and described hydraulic efficiency pressure system of manual sensor, described three bridge trailers and described tractor truck junction in the operator's compartment, described manual sensor, described rotating disk sensor, described pressure sensor, described steeraxle position transduser respectively with described central control unit electrical connection.
5. three bridge trailer steering swivel systems as claimed in claim 4, it is characterized in that, described hydraulic efficiency pressure system includes Hydraulic Pump, press fuel tank, the hydraulic electromagnetic valve module, 2 hydraulic rams, described hydraulic electromagnetic change valve assembled is on described hydraulic reservoir, described electromagnetic switch valve module comprises the valve body that surges, pressure sensor, electromagnetic valve body, the described valve body that surges, described pressure sensor, described electromagnetic valve body is by the bolted connection one, and the described valve body that surges is provided with the pipeline connector, by described pipeline connector, described surge valve body respectively with described hydraulic oil pump, described hydraulic reservoir connects, and described Hydraulic Pump connects the change speed gear box of described front haulage car.
6. three bridge trailer steering swivel systems as claimed in claim 5 is characterized in that, described 2 hydraulic rams series connection is used, and the stop check valve is housed on first hydraulic ram, and hydraulic ram is installed on the cylinder bracket respectively.
7. three bridge trailer steering swivel systems as claimed in claim 5, it is characterized in that, the input end of described central control unit connects described manual sensor, described rotating disk sensor, described pressure sensor and described steeraxle position transduser, and the mouth of described central control unit produces electromagnetic switch valve module and the electronic lock system that the output control signal connects hydraulic efficiency pressure system.
8. three bridge trailer steering swivel systems as claimed in claim 7, it is characterized in that, described steering hardware comprises steeraxle, described steeraxle both sides are equipped with rotatable steering shaft, bearing wheel hub and tire are housed on the described steering shaft, be equipped with on the described wheel hub and turn to support arm, described hydraulic ram connects and turns to support arm, describedly turns to support arm to connect to turn to lateral connecting rod.
9. three bridge trailer steering swivel systems as claimed in claim 8, it is characterized in that, described electronic lock system comprises electromagnetism straight line lock, support ear of described tierod one end seam is used for connection and turns to oil cylinder, the described oil cylinder other end that turns to connects cylinder bracket, described cylinder bracket is welded on and turns on the pontic, described cylinder bracket upper bolt connects described electromagnetism straight line lock, in the described electromagnetism straight line lock movable straight pin is arranged, be provided with a hole in the middle of the described tierod, be the lock pin axis hole of described electromagnetism straight line lock.
10. as each described three bridge trailer steering swivel systems of claim 1-9, it is characterized in that described central control unit is the PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202028446U CN202089109U (en) | 2011-06-16 | 2011-06-16 | Steering system of three-bridge trailer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202028446U CN202089109U (en) | 2011-06-16 | 2011-06-16 | Steering system of three-bridge trailer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202089109U true CN202089109U (en) | 2011-12-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202028446U Expired - Fee Related CN202089109U (en) | 2011-06-16 | 2011-06-16 | Steering system of three-bridge trailer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202089109U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320329A (en) * | 2011-06-16 | 2012-01-18 | 迟树廷 | Three-axle trailer steering system |
| CN110637542A (en) * | 2019-08-30 | 2020-01-03 | 江苏大学 | Pull steering type liftable heavy-load chassis for bundling and film-coating integrated machine |
-
2011
- 2011-06-16 CN CN2011202028446U patent/CN202089109U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320329A (en) * | 2011-06-16 | 2012-01-18 | 迟树廷 | Three-axle trailer steering system |
| CN102320329B (en) * | 2011-06-16 | 2013-02-20 | 迟树廷 | Three-axle trailer steering system |
| CN110637542A (en) * | 2019-08-30 | 2020-01-03 | 江苏大学 | Pull steering type liftable heavy-load chassis for bundling and film-coating integrated machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Chi Shuting Document name: Notification to Pay the Fees |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111228 Termination date: 20130616 |