Full-steering deck jacking vehicle

Abstract

The invention relates to the technical field of marine equipment, in particular to a full-steering deck jacking vehicle which comprises a vehicle frame, a jacking plate and a cockpit and further comprises wheel sets, a steering module, supporting legs, sliding rings and steel balls, the four wheel sets are rotationally connected to the lower portion of the vehicle frame, the steering module is connected among the four wheel sets, each supporting leg comprises a cylinder body and a push rod, and the sliding rings are connected between the cylinder bodies and the push rods. The cylinder body is installed below a frame, the push rod is inserted into the cylinder body, the cylinder body is sleeved with the sliding ring, the sliding ring moves in the axial direction and the circumferential direction of the cylinder body, and the multiple steel balls are rotationally installed below the sliding ring; two strokes are set for the supporting legs of the deck jacking vehicle, the supporting legs and the tires move together at the tail section of the first stroke, and the supporting legs are independently supported at the tail section of the second stroke, so that the purposes of reducing friction between the tires and the surface of the deck and further weakening the abrasion phenomenon are achieved, the situation that the supporting legs fall repeatedly in the steering process of the tires is avoided, and the service life of the deck jacking vehicle is prolonged. And the transportation efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of marine equipment, and particularly to a fully steerable deck lifting vehicle. Background Art

[0002] Marine transportation is the basic support for global trade. It not only has extremely low transportation costs, but also has significant economies of scale and can transport various types of goods, including mechanical equipment and dangerous goods. Marine engineering equipment often makes different designs according to the types of transported items. For example, for a ro-ro ship used for transporting various types of automobiles, in order to maximize the storage space, multiple decks are provided on the hull of the ro-ro ship. And to adapt to various vehicle types (such as cars being lower in height than engineering vehicles), the height of the even-numbered decks can usually be adjusted up and down. Each deck is composed of multiple small decks spliced together. To control the height of each small deck, a deck lifting vehicle is parked under the small deck.

[0003] The load-bearing state of the small deck above the deck lifting vehicle changes with the types, quantities, and arrangement methods of the cars it supports. Correspondingly, before each feeding of the small deck, it is necessary to calculate in advance the support position of the deck lifting vehicle on the small deck to avoid accidents induced by unstable or tilted decks during transportation. To adjust the support position of the deck lifting vehicle on the small deck, the deck lifting vehicle needs to have a steering function. However, the deck lifting vehicle is heavy and has a slow driving speed, and the friction force between it and the deck during steering is extremely large, which will not only exacerbate the wear of its own tires but also damage the deck surface (the deck surface is usually treated with anti-slip measures, such as coatings). To avoid the wear between the tires and the deck surface, the prior art uses a lifting and steering method, that is, first lower the outriggers of the deck lifting vehicle to separate the tires of the deck lifting vehicle from the deck below the vehicle, then adjust the steering of the tires, and then raise the outriggers to make the tires contact the deck again.

[0004] The prior art avoids the contact between the tires and the deck during the steering of the deck lifting vehicle, thereby avoiding the friction between the deck and the tires, and thus protecting the tires and the deck surface. However, this also induces new problems. The deck lifting vehicle often undergoes multiple turns when traveling from the original position to the set position. In the prior art, each turn will be accompanied by a lowering and raising of the outriggers, which will greatly reduce the efficiency of adjusting the position of the deck lifting vehicle, thereby affecting the transportation efficiency of the ro-ro ship.

[0005] Therefore, a fully steerable deck lifting vehicle is proposed. Summary of the Invention

[0006] The object of the present invention is to provide a fully steerable deck lifting vehicle, which solves the problem that the deck lifting vehicle needs to go through the lifting process every time it steers. By setting two-stage strokes for the outriggers of the deck lifting vehicle, and making the outriggers and the tires move together at the end of the first-stage stroke, and making the outriggers independently support at the end of the second-stage stroke, the purpose of reducing the friction between the tires and the deck surface and thus weakening the wear phenomenon is achieved, and the multiple lowering and lifting of the outriggers during the tire steering process are avoided, thereby improving the transportation efficiency.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A fully steerable deck lifting vehicle includes a vehicle frame, a lifting plate, a cockpit, and further includes a wheel set, a steering module, outriggers, a slip ring and steel balls. The four wheel sets are rotatably connected below the vehicle frame. The steering module is connected between the four wheel sets. The outriggers include a cylinder body and a push rod. The cylinder body is installed below the vehicle frame. The push rod is inserted into the cylinder body. The slip ring is sleeved on the cylinder body and moves axially and circumferentially along the cylinder body. A plurality of the steel balls are rotatably installed below the slip ring;

[0009] The push rod moves downward under the action of the oil pressure inside the cylinder body to drive the steel balls to press tightly against the deck. The four wheel sets are synchronously adjusted by the steering module to rotate synchronously and in the same direction. The slip ring that rotates under the drive of the steering module is separated from the further downward moving push rod.

[0010] Preferably, the wheel set includes a longitudinal axis, a transverse axis and a tire. The longitudinal axis is rotatably connected below the vehicle frame. The transverse axis is connected below the longitudinal axis. The two tires are respectively installed at both ends of the transverse axis;

[0011] In the above solution, two tires form a wheel set, and thus the steering of the wheel set is realized through the rotational connection between the longitudinal axis and the vehicle frame. Compared with a single-wheel wheel set, this solution does not require a cross beam to be arranged between the two wheel sets and drive the cross beam to rotate, thereby reducing the torque requirement for the deck lifting vehicle to steer.

[0012] Preferably, the projections of the central axes of the four longitudinal axes on the horizontal plane are located at the four vertices of the same rectangle, and this rectangle is denoted as the steering rectangle. The steering module includes a first rotating ring and a first shifting lever. The first rotating ring is rotatably connected to the lower side of the vehicle frame, and the projection of the center of the first rotating ring on the horizontal plane coincides with the center of the steering rectangle. The four first shifting levers are circumferentially arrayed on the circumferential surface of the first rotating ring. The extending end of the first shifting lever and the circumferential surface of the longitudinal axis are provided with a meshing tooth surface structure;

[0013] In the above solution, the rotation of the first rotating ring on the vehicle frame drives the four first shifting levers to rotate synchronously, and further drives the four wheel sets to steer synchronously.

[0014] Preferably, the steering module further includes a rotating rod, a worm, and a worm gear. The rotating rod is rotatably connected to the vehicle frame, and the central axis of the rotating rod coincides with the midpoint of the steering rectangle. The first rotating ring is connected to the rotating rod. The worm is rotatably connected to the vehicle frame. Threads are provided at both ends of the worm, and the helix directions of the threads at both ends of the worm are opposite. The rotating rod meshes with the rear end of the worm. The worm gear is rotatably connected to the cockpit and meshes with the front end of the worm;

[0015] In the above solution, the worm gear is fixedly connected to the steering wheel in the cockpit. By rotating the worm gear, power is provided for the rotation of the wheel set. The helix directions of the threads at both ends of the worm are opposite to make the steering direction of the wheel set the same as that of the worm gear, so as to improve the driver's operation experience.

[0016] Preferably, the peripheral surface of the cylinder block is provided with a spline structure, and a ball spline bearing is installed between the outer periphery of the cylinder block and the inner periphery of the slip ring;

[0017] In the above solution, through the installation of the ball spline bearing, the slip ring can slide axially along the cylinder block and also rotate around the outer periphery of the cylinder block.

[0018] Preferably, a bottom ring is connected below the slip ring, a spring is installed between the lower end surface of the cylinder block and the upper end surface of the bottom ring. The natural length and elastic modulus of the spring satisfy that when the spring is only affected by the gravity of the slip ring and the steel balls, the steel balls do not contact the deck. The lower end of the push rod is connected with a bottom plate. The outer diameter of the push rod and the inner diameter of the bottom ring are both smaller than the outer diameter of the bottom plate, and the inner diameter of the slip ring is larger than the outer diameter of the bottom plate;

[0019] In the above solution, through the relationship settings of the outer diameter of the push rod, the inner diameter of the bottom ring, the outer diameter of the bottom plate, and the inner diameter of the slip ring, when the push rod moves downward, it drives the bottom ring to move downward, so that the steel balls on the bottom ring contact the deck, thereby sharing the support force of the deck on the tire, reducing the friction suffered by the tire during steering, weakening the wear of the deck jacking vehicle tire and the deck surface, and during the driving process of the deck jacking vehicle, the bottom ring makes rolling contact with the deck through the steel balls, which can also reduce the friction between the two.

[0020] Preferably, the outer peripheral surface of the bottom plate is provided with a spline structure, and the inner peripheral surface of the bottom ring is provided with a spline groove structure matching the spline structure of the bottom plate;

[0021] In the above solution, through the two contact states of the bottom ring and the bottom plate, the bottom ring follows the bottom plate to move downward to assist the tire in steering, and the bottom ring is separated from the bottom plate to reset respectively.

[0022] Preferably, a rotating plate is rotatably connected to the lower end surface of the cylinder block, and the upper end of the spring is connected to the rotating plate;

[0023] In the above solution, through the rotational connection of the rotating plate on the cylinder block, the spring rotates together with the slip ring to avoid the twisting of the spring during the rotation of the slip ring.

[0024] Preferably, the projections of the central axes of the four cylinder blocks on the horizontal plane are located at the four vertices of the same rectangle, and this rectangle is denoted as the lifting rectangle. The center of the lifting rectangle coincides with the center of the steering rectangle. The steering module further includes a second rotating ring and a second lever. The second rotating ring is connected to the rotating rod. The four second levers are circumferentially arrayed on the circumferential surface of the second rotating ring. The extending ends of the second levers and the outer circumferential surface of the slip ring are provided with a meshing tooth surface structure. Electromagnetic clutches are installed between the rotating rod and the first rotating ring and between the rotating rod and the second rotating ring respectively.

[0025] In the above solution, through the rotation of the second rotating ring on the rotating rod, the synchronous rotation of the four slip rings is realized, so as to synchronously realize the switching of the contact state between the bottom plate and the bottom ring. The coordinated use of the two electromagnetic clutches enables the rotation of the worm wheel to control both the steering of the lifting vehicle on the deck and the contact state between the bottom plate and the bottom ring.

[0026] Preferably, a cage is installed below the bottom ring, and a plurality of steel balls are installed inside the cage.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. The present invention enables the push rod to have two strokes. In the first stroke, the push rod pushes the slip ring downward so that the steel balls contact the deck, thereby sharing the support force of the deck on the tire, reducing the friction between the tire and the deck, avoiding the wear of the tire and the deck surface, and during the driving of the lifting vehicle on the deck, the steel balls roll on the deck, so that under the condition that the steel balls remain in contact with the deck, the friction between the steel balls and the deck is minimized, thus avoiding the repeated lowering and lifting of the outriggers during the steering process and reducing the wear between the outriggers and the deck. In the second stroke, the push rod separates the slip ring and continues to move downward to lift the tire of the lifting vehicle on the deck, thereby stabilizing the vehicle body during the lifting operation.

[0029] 2. The present invention realizes the abutment and separation of the push rod and the slip ring in the two strokes through the spline structure on the push rod bottom plate and the spline groove structure of the slip ring bottom ring. In the first stroke, the slip ring rotates around the cylinder block by means of the spline ball bearing inside itself, so that the lower surface of the spline abuts against the upper surface of the spline groove, and then the push rod drives the slip ring to move downward, so that the steel balls contact the deck, thereby assisting the tire to turn and avoiding the wear of the tire and the deck surface. In the second stroke, the slip ring rotates again so that the spline entity enters the spline groove, and then under the action of the spring, the slip ring resets, so that the push rod continues to move downward to lift the vehicle body.

[0030] 3. Through the setting of the steering module, the present invention provides power for two processes of tire steering and slip ring rotation. When the worm rotates to drive the rotating rod and the electromagnetic clutch inside the first rotating ring or the second rotating ring is electrified, the first rotating ring or the second rotating ring is fixedly connected to the rotating rod, thereby driving the tire to steer or the slip ring to rotate. Moreover, threads with opposite helix directions are arranged at both ends of the worm so that the steering direction of the worm gear is consistent with the steering directions of the tire and the slip ring, simplifying the operation and thus improving the transportation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is an isometric structural schematic diagram of the whole of the present invention;

[0032] Figure 2 is a front view structural schematic diagram of the whole of the present invention;

[0033] Figure 3 is a structural schematic diagram of the bottom of the vehicle frame of the present invention;

[0034] Figure 4 is a bottom view structural schematic diagram of the whole of the present invention;

[0035] Figure 5 of the present invention Figure 1 is an enlarged schematic diagram of part A;

[0036] Figure 6 is a schematic diagram of the state where the steel balls contact the deck of the present invention;

[0037] Figure 7 is a schematic diagram of the state where the push rod separates the slip ring of the present invention;

[0038] Figure 8 is a schematic diagram of the state where the push rod lifts the vehicle body of the present invention.

[0039] In the figure: 1. Vehicle frame; 2. Jacking plate; 3. Cockpit; 4. Wheel set; 41. Longitudinal axis; 42. Transverse axis; 43. Tire; 5. Steering module; 51. First rotating ring; 52. First lever; 53. Rotating rod; 54. Worm; 55. Worm gear; 56. Second rotating ring; 57. Second lever; 6. Leg; 61. Cylinder block; 611. Rotating plate; 62. Push rod; 621. Bottom plate; 7. Slip ring; 71. Bottom ring; 711. Cage; 8. Steel ball; 9. Steering rectangle; 10. Ball spline bearing; 11. Lifting rectangle; 12. Electromagnetic clutch; 13. Spring. DETAILED DESCRIPTION OF THE INVENTION

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0041] Please refer to Figures 1 to 8 , the present invention provides a fully steerable deck lifting vehicle, and the technical solution is as follows:

[0042] A fully steerable deck lifting vehicle includes a vehicle frame 1, a lifting plate 2, and a cockpit 3. The lifting plate 2 and the cockpit 3 are both installed on the vehicle frame 1. The lifting plate 2 is lifted and lowered through a hydraulic system to adjust the height of the upper deck. It also includes a wheel set 4, a steering module 5, a leg 6, a slip ring 7, and steel balls 8. Four wheel sets 4 are rotatably connected to the lower part of the vehicle frame 1. The steering module 5 is connected between the four wheel sets 4. The leg 6 includes a cylinder block 61 and a push rod 62. The cylinder block 61 is installed on the lower part of the vehicle frame 1. The push rod 62 is inserted into the cylinder block 61. The slip ring 7 is sleeved on the cylinder block 61, and the slip ring 7 moves axially and circumferentially along the cylinder block 61. A cage 711 is installed below the bottom ring 711, and a plurality of steel balls 8 are installed inside the cage 711;

[0043] The push rod 62 moves downward under the action of the oil pressure inside the cylinder block 61 to drive the steel balls 8 to press tightly against the deck. The four wheel sets 4 are synchronously adjusted by the steering module 5 to rotate synchronously and in the same direction. The slip ring 7 that rotates driven by the steering module 5 is separated from the further downward moving push rod 62.

[0044] As an implementation manner of the present invention, referring to Figure 3 , the wheel set 4 includes a longitudinal axis 41, a transverse axis 42, and a tire 43. The longitudinal axis 41 is rotatably connected to the lower part of the vehicle frame 1. The transverse axis 42 is connected to the lower part of the longitudinal axis 41. Two tires 43 are respectively installed at both ends of the transverse axis 42;

[0045] The longitudinal axis 41 is fixedly connected to the transverse axis 42. A bearing is installed between the longitudinal axis 41 and the vehicle frame 1 to realize the rotation of the longitudinal axis 41, and thus the steering of the tire 43. Bearings are installed between the four front tires 43 and the transverse axis 42 for rotational connection; the four rear tires 43 are driving wheels. These four tires 43 can be rotationally connected to the transverse axis 42 as described above, or can be not connected. A transmission shaft is rotatably connected inside the transverse axis 42 at the rear side, and a driving shaft is rotatably installed inside the longitudinal axis 41 at the rear side. The driving shaft and the transmission shaft are perpendicular to each other, and the two are meshed through bevel gears. And one transmission shaft is meshed on each side of the driving shaft to be fixedly connected to the two tires 43 on a set of wheel sets 4 respectively, so as to drive the two tires 43 simultaneously.

[0046] As an implementation manner of the present invention, referring to Figure 4, the projections of the central axes of the four vertical axes 41 on the horizontal plane are located at the four vertices of the same rectangle, and this rectangle is denoted as the steering rectangle 9. The steering module 5 includes a first swivel ring 51 and a first lever 52. The first swivel ring 51 is rotatably connected to the lower side of the vehicle frame 1, and the projection of the center of the first swivel ring 51 on the horizontal plane coincides with the center of the steering rectangle 9. The four first levers 52 are circumferentially arrayed on the circumferential surface of the first swivel ring 51, and the extended ends of the first levers 52 and the circumferential surface of the vertical axis 41 are provided with a meshing tooth surface structure; the first lever 52 is welded to the first swivel ring 51, and the tooth surface structure is welded to the extended end of the first lever 52 (reinforcing ribs are arranged according to the actual situation during welding to ensure the structural strength), and the specifications of the tooth surface structures on the four first levers 52 are the same, and the center of the pitch circle of the tooth surface structure coincides with the center of the steering rectangle 9; an arc-shaped slider is installed above the first lever 52, and an arc-shaped slider is installed below the vehicle frame 1 to enable the first lever 52 to rotate below the vehicle frame 1.

[0047] As an embodiment of the present invention, referring to Figure 1 , Figure 2 and Figure 4 , the steering module 5 further includes a rotating rod 53, a worm 54 and a worm gear 55. The rotating rod 53 is rotatably connected to the vehicle frame 1, and the central axis of the rotating rod 53 coincides with the midpoint of the steering rectangle 9. The first swivel ring 51 is connected to the rotating rod 53. The worm 54 is rotatably connected to the vehicle frame 1. Threads are provided at both ends of the worm 54, and the helix directions of the threads at both ends of the worm 54 are opposite. The rotating rod 53 meshes with the rear end of the worm 54. The worm gear 55 is rotatably connected to the cockpit 3, and the worm gear 55 meshes with the front end of the worm 54;

[0048] The worm gear 55 is fixedly connected to the steering wheel above, and a steering assist device is installed on the steering wheel connecting rod to assist the driver in operation; when installing the worm 54, the worm 54 is placed obliquely, and the front end of the worm 54 is biased to the left so that the steering wheel is located on the left side of the cockpit 3; in this mode, the thread at the front end of the worm 54 is set as a left-handed thread, and the thread at the rear end of the worm 54 is set as a right-handed thread. When the steering wheel turns left, the worm gear 55 drives the left-handed thread to rotate to the right, and the right-handed thread rotates in the same direction as the left-handed thread, thereby causing the rotating rod 53 meshing with the right-handed thread to rotate to the right, and then driving the vertical axis 41 to rotate to the left, that is, making the tire 43 turn to the left.

[0049] As an embodiment of the present invention, referring to Figure 5The circumference of the cylinder body 61 is set as a spline structure, a ball spline bearing 10 is installed between the outer periphery of the cylinder body 61 and the inner periphery of the slip ring 7, a bottom ring 71 is connected below the slip ring 7, a spring 13 is installed between the lower end surface of the cylinder body 61 and the upper end surface of the bottom ring 71, and the natural length and elastic modulus of the spring 13 meet: when the spring 13 is only subjected to the gravity of the slip ring 7 and the steel ball 8, the steel ball 8 does not contact the deck, the lower end of the push rod 62 is connected to the bottom plate 621, the outer diameter of the push rod 62 and the inner diameter of the bottom ring 71 are both smaller than the outer diameter of the bottom plate 621, and the inner diameter of the slip ring 7 is larger than the outer diameter of the bottom plate 621; the outer circumference of the bottom plate 621 is set as a spline structure, and the inner circumference of the bottom ring 71 is set as a spline groove structure matching the spline structure of the bottom plate 621;

[0050] During the downward movement of the push rod 62, the lower end surface of the bottom plate 621 is firstly made to abut against the upper end surface of the bottom ring 71 to drive the slip ring 7 to be pressed down until the steel ball 8 is in contact with the deck. At this time, the deck jacking vehicle is in the auxiliary steering state. The deck jacking vehicle can travel and turn normally in this state. When the deck jacking vehicle travels to the set position, the support leg 6 lifts the vehicle body to make the tire 43 separate from the deck below. The process is as follows: the push rod 62 first moves up a distance, and then rotates the slip ring 7, and the spline entity of the bottom plate 621 enters the spline groove of the bottom ring 71, so that the push rod 62 separates the slip ring 7, so that it can further descend under the action of the oil pressure inside the cylinder body 61; to ensure that the push rod 62 separates the slip ring 7 smoothly, the gap of the spline groove should be larger than the volume of the spline entity.

[0051] As an embodiment of the present invention, refer to Figure 5 and Figure 6 The lower end surface of the cylinder body 61 is rotatably connected with a rotating plate 611, and the rotating plate 611 is connected to the upper end of the spring 13; a plane bearing is installed between the upper end surface of the rotating plate 611 and the lower end surface of the cylinder body 61 to realize the rotatable connection of the rotating plate 611.

[0052] As an embodiment of the present invention, refer to Figure 3 and Figure 4 , the projections of the central axes of the four cylinder bodies 61 on the horizontal plane are located on the four vertices of the same rectangle, which is recorded as the lifting rectangle 11. The center of the lifting rectangle 11 coincides with the center of the steering rectangle 9. The steering module 5 also includes a second rotating ring 56 and a second lever 57. The second rotating ring 56 is connected to the rotating rod 53. Four second levers 57 are arranged in a circular array on the circumference of the second rotating ring 56. The protruding end of the second lever 57 and the outer circumference of the slip ring 7 are set as meshing tooth surface structures. An electromagnetic clutch 12 is installed between the rotating rod 53 and the first rotating ring 51 and between the rotating rod 53 and the second rotating ring 56; the control switch of the electromagnetic clutch 12 is installed in the cab. When the electromagnetic clutch 12 in the first rotating ring 51 is energized, the steering wheel is turned to steer. When the electromagnetic clutch 12 in the second rotating ring 56 is energized, the steering wheel is turned to rotate the slip ring 7, thereby switching the contact state between the bottom plate 621 and the bottom ring 71.

[0053] Working principle: The present invention sets two strokes for the push rod 62. In the first stroke, the push rod 62 drives the slip ring 7 to move downward, so that the steel balls 8 below the slip ring 7 contact the deck, sharing the force on the tire 43, thereby reducing the friction between the tire 43 and the deck during the steering process, weakening the wear between the tire 43 and the deck surface, and during the driving of the deck lifting vehicle, the steel balls 8 always maintain rolling friction with the deck; in the second stroke, the push rod 62 separates the slip ring 7 and continues to move downward, thereby lifting the tire 43 off the deck to stabilize the body of the lifting operation; in addition, by switching the energization states of the two electromagnetic clutches 12, the steering module 5 is used to provide power for the steering of the tire 43 and the rotation of the slip ring 7 respectively;

[0054] Specifically, in order to make the push rod 62 drive the slip ring 7 to move downward so that the steel balls 8 contact the deck to assist the steering of the tire 43, a bottom plate 621 and a bottom ring 71 are respectively arranged below the push rod 62 and the slip ring 7, and the outer diameter of the push rod 62 and the inner diameter of the bottom ring 71 are both smaller than the outer diameter of the bottom plate 621, and the inner diameter of the slip ring 7 is larger than the outer diameter of the bottom plate 621. In addition, a spline ball bearing is installed between the slip ring 7 and the cylinder block 61 so that the slip ring 7 can axially slide along the cylinder block 61; through the above arrangement, the lower end surface of the bottom plate 621 contacts the upper end surface of the bottom ring 71 during the downward movement, thereby driving the bottom ring 71 to move downward until the steel balls 8 contact the deck;

[0055] In order for the push rod 62 to separate the slip ring 7 so that the push rod 62 continues to move downward to lift and stabilize the body; the outer peripheral surface of the bottom plate 621 is set as a spline structure, and the inner peripheral surface of the bottom ring 71 is set as a spline groove structure matching the spline structure of the bottom plate 621. In addition, a spring 13 is installed between the push rod 62 and the bottom ring 71; during separation, the push rod 62 first rises a certain distance to weaken the pulling force of the spring 13 and eliminate the friction between the steel balls 8 and the deck, making it easier for the push rod 62 to separate the slip ring 7. Then, the slip ring 7 is rotated to make the spline entity of the bottom plate 621 enter the spline groove, so that the slip ring 7 is reset under the pulling force of the spring 13;

[0056] In order to make the four sets of wheel sets 4 turn synchronously to make the movement of the deck lifting vehicle smooth; the four longitudinal axes 41 are respectively arranged at the vertices of the steering rectangle 9, and the center of the first rotating ring 51 coincides with the center of the steering rectangle 9. When the first rotating ring 51 rotates, it drives the four first shift rods 52 to rotate synchronously, driving the four longitudinal axes 41 meshing with the first shift rods 52 to rotate synchronously, and the transverse axis 42 is fixedly connected below the longitudinal axis 41, and the two tires 43 are respectively installed at both ends of the transverse axis 42, thereby realizing the rotation of the tire 43 along with the longitudinal axis 41;

[0057] In order to achieve the synchronous rotation of the four slip rings 7 to synchronously switch the contact states of multiple bottom plates 621 with the bottom ring 71, the four cylinders 61 are respectively arranged at the vertices of the lifting rectangle 11, and the center of the second rotating ring 56 coincides with the center of the lifting rectangle 11. When the second rotating ring 56 rotates, it drives the four second lever arms 57 to rotate synchronously, so as to drive the four slip rings 7 engaged with the second lever arms 57 to rotate synchronously, so that the lower end surface of the bottom plate 621 contacts the upper end surface of the bottom ring 71, so that the push rod 62 drives the slip ring 7 to move downward, or the spline entity of the bottom plate 621 enters the spline groove of the bottom ring 71, so that the push rod 62 separates the slip ring 7;

[0058] In order to provide power for the steering of the wheel set 4 and the rotation of the slip ring 7 during the process, the centers of the steering rectangle 9 and the lifting rectangle 11 coincide, and a rotating rod 53 is arranged at the coincident center. The rotating rod 53 is rotatably connected to the vehicle frame 1, and both the first rotating ring 51 and the second rotating ring 56 are sleeved on the rotating rod 53, and electromagnetic clutches 12 are installed between the rotating rod 53 and the first rotating ring 51 and between the rotating rod 53 and the second rotating ring 56 respectively. During operation, the steering wheel rotates, and with the help of the power assist device, the worm gear 55 rotates. After the power is transmitted through the worm 54, the rotating rod 53 rotates. At this time, when the electromagnetic clutch 12 inside the first rotating ring 51 or the second rotating ring 56 is electrified, the first rotating ring 51 or the second rotating ring 56 is fixedly connected to the rotating rod 53 to drive the wheel set 4 to steer or the slip ring 7 to rotate;

[0059] In order to make the steering direction of the worm gear 55 consistent with the steering direction of the tire 43 to simplify the operation of the driver and thus improve the transportation efficiency, the helix directions of the threads at both ends of the worm 54 are opposite.

[0060] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fully steerable deck lifting vehicle, comprising a vehicle frame (1), a lifting plate (2) and a cockpit (3), characterized in that: It also includes a wheel set (4), a steering module (5), outriggers (6), a slip ring (7) and steel balls (8). The four wheel sets (4) are rotatably connected below the vehicle frame (1). The steering module (5) is connected between the four wheel sets (4). The outrigger (6) includes a cylinder block (61) and a push rod (62). The cylinder block (61) is installed below the vehicle frame (1). The push rod (62) is inserted into the cylinder block (61). The slip ring (7) is sleeved on the cylinder block (61), and the slip ring (7) moves axially and circumferentially along the cylinder block (61). A plurality of the steel balls (8) are rotatably installed below the slip ring (7). The push rod (62) moves downward under the action of the internal oil pressure of the cylinder block (61) to drive the steel balls (8) to press tightly against the deck. The four wheel sets (4) are synchronously adjusted by the steering module (5) to rotate synchronously and in the same direction. The slip ring (7) that rotates under the drive of the steering module (5) is separated from the further downward moving push rod (62).

2. The full-rotation deck lifting vehicle according to claim 1, characterized in that: The wheel set (4) includes a longitudinal axis (41), a transverse axis (42) and a tire (43). The longitudinal axis (41) is rotatably connected below the vehicle frame (1). The transverse axis (42) is connected below the longitudinal axis (41). The two tires (43) are respectively installed at both ends of the transverse axis (42).

3. The full-steering deck jacking vehicle according to claim 2, characterized in that: The projections of the central axes of the four longitudinal axes (41) on the horizontal plane are located at the four vertices of the same rectangle, and this rectangle is denoted as the steering rectangle (9). The steering module (5) includes a first rotating ring (51) and a first shifting lever (52). The first rotating ring (51) is rotatably connected to the lower side of the vehicle frame (1), and the projection of the center of the first rotating ring (51) on the horizontal plane coincides with the center of the steering rectangle (9). The four first shifting levers (52) are circumferentially arrayed on the circumferential surface of the first rotating ring (51). The extended end of the first shifting lever (52) and the circumferential surface of the longitudinal axis (41) are set as a meshing tooth surface structure.

4. The full-rotation deck lifting vehicle according to claim 3, wherein: The steering module (5) also includes a rotating rod (53), a worm (54) and a worm gear (55). The rotating rod (53) is rotatably connected to the vehicle frame (1), and the central axis of the rotating rod (53) coincides with the midpoint of the steering rectangle (9). The first rotating ring (51) is connected to the rotating rod (53). The worm (54) is rotatably connected to the vehicle frame (1). Threads are provided at both ends of the worm (54), and the helix directions of the threads at both ends of the worm (54) are opposite. The rotating rod (53) meshes with the rear end of the worm (54). The worm gear (55) is rotatably connected to the cockpit (3), and the worm gear (55) meshes with the front end of the worm (54).

5. The full-rotation deck lifting vehicle according to claim 1, characterized in that: The circumferential surface of the cylinder block (61) is set as a spline structure. A ball spline bearing (10) is installed between the outer circumference of the cylinder block (61) and the inner circumference of the slip ring (7).

6. The full-steering deck lifting vehicle according to claim 5, wherein: A bottom ring (71) is connected below the slip ring (7). A spring (13) is installed between the lower end face of the cylinder block (61) and the upper end face of the bottom ring (71). The natural length and elastic modulus of the spring (13) satisfy that when the spring (13) is only affected by the gravity of the slip ring (7) and the steel balls (8), the steel balls (8) do not contact the deck. The lower end of the push rod (62) is connected with a bottom plate (621). The outer diameter of the push rod (62) and the inner diameter of the bottom ring (71) are both smaller than the outer diameter of the bottom plate (621), and the inner diameter of the slip ring (7) is larger than the outer diameter of the bottom plate (621).

7. The full-steering deck lifting vehicle according to claim 6, wherein: The outer peripheral surface of the bottom plate (621) is provided with a spline structure, and the inner peripheral surface of the bottom ring (71) is provided with a spline groove structure matching the spline structure of the bottom plate (621).

8. The full-rotation deck lifting vehicle according to claim 7, characterized in that: A rotating plate (611) is rotatably connected to the lower end face of the cylinder block (61), and the rotating plate (611) is connected to the upper end of the spring (13).

9. A fully steerable deck lifting vehicle according to claim 4 or 7, characterized in that: The projections of the central axes of the four cylinder blocks (61) on the horizontal plane are located at the four vertices of the same rectangle, and this rectangle is denoted as the lifting rectangle (11). The center of the lifting rectangle (11) coincides with the center of the steering rectangle (9). The steering module (5) further includes a second rotating ring (56) and a second shifting lever (57). The second rotating ring (56) is connected to the rotating rod (53). The four second shifting levers (57) are circumferentially arrayed on the circumferential surface of the second rotating ring (56). The extending end of the second shifting lever (57) and the outer peripheral surface of the slip ring (7) are provided with a meshing tooth surface structure. Electromagnetic clutches (12) are installed between the rotating rod (53) and the first rotating ring (51) and between the rotating rod (53) and the second rotating ring (56).

10. A full-rotation deck lifting vehicle according to claim 6, characterized in that: A cage (711) is installed below the bottom ring (71), and a plurality of the steel balls (8) are installed inside the cage (711).

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