Rear wheel steering structure of oil field movable steam-injection boiler

Abstract

The invention discloses a rear wheel steering structure of an oil field movable steam-injection boiler, and belongs to the technical field of steering structures.The rear wheel steering structure of the oil field movable steam-injection boiler comprises a vehicle head and a bearing bridge, the vehicle head is movably connected with the bearing bridge, and meanwhile the bottom of the bearing bridge is rotationally connected with a plurality of hydraulic rods which are symmetrically arranged in a rectangular shape; a stabilizing assembly is rotationally connected to the top of the bearing bridge and used for adjusting the overall gravity center of the transferred boiler and reducing the overturning risk of a vehicle, and a multi-wheel steering assembly is installed at the position, between the hydraulic rods, of the bottom of the bearing bridge and used for actively counteracting the twisting stress of the bearing bridge and the installing plate and protecting the boiler. The stabilizing assembly and the multi-wheel steering assembly are adopted, the problems that large equipment in an oil field is difficult to turn, is afraid of bumping and is prone to sinking are solved, the transfer efficiency of the steam-injection boiler is improved, and the transfer risk is reduced.

Description

Technical Field

[0001] This invention belongs to the field of steering structure technology, specifically relating to a rear wheel steering structure for an oilfield mobile steam injection boiler. Background Technology

[0002] In oil fields, especially heavy oil fields and viscous oil layers, steam injection technology becomes particularly important when conventional oil extraction methods cannot effectively extract oil. By injecting steam, viscous heavy oil becomes more fluid. Steam injection boilers are an important piece of equipment used in oil field development. Their main function is to improve the efficiency of oil and gas extraction by injecting steam. During construction, the steam injection boiler, water treatment, water tank, control room, and other auxiliary construction equipment at the well site need to be transported to the new construction well site. Due to the large size and heavy weight of the steam injection boiler, and the fact that the construction process often needs to be carried out in remote well sites or complex terrain environments, the transportation process is particularly complex. Load-bearing vehicles are the key equipment for transporting steam injection boilers. The load-bearing capacity of the load-bearing vehicles needs to match the weight of the boiler, and the terrain conditions of the transportation route also need to be considered to ensure transportation safety.

[0003] Steam injection boilers are large and long. Traditional multi-axle flatbed trucks use fixed rear axles, which require a lot of road space when turning. Turning and U-turns are extremely difficult in narrow roads within oil fields, well site entrances, or maintenance areas, often requiring multiple maneuvers ("knocking on the wheel"), which is inefficient and risky. If simple linkage synchronous multi-axle steering is used, the wheel trajectory deviation is large on rough roads, resulting in severe tire wear ("tire wear"), causing abnormal wear or even damage. Fully hydraulic and other active steering systems are expensive and prone to failure under heavy and harsh conditions. Furthermore, the weight is highly concentrated, and when moving on unpaved roads or simple well site roads, it is very easy to cause the road surface to sink and create deep grooves, which not only damages the road but may also cause the vehicle to tilt and get stuck. Moreover, when passing through cross-axle roads (such as one wheel running over a protrusion), the extra-long load-bearing frame will undergo complex torsional deformation. If this deformation is not effectively released or controlled, it will be transmitted to the boiler base, generating additional stress, which may affect the boiler body or critical connection parts in the long term. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a rear wheel steering structure for a mobile steam injection boiler in an oil field.

[0005] The technical solution adopted to solve the above technical problems is: a rear wheel steering structure for a mobile steam injection boiler in an oil field, including a cab and a load-bearing axle, wherein the cab and the load-bearing axle are movably connected, and a number of hydraulic rods arranged in a rectangular symmetrical manner are rotatably connected to the bottom of the load-bearing axle, and a stabilizing component is rotatably connected to the top of the load-bearing axle for adjusting the overall center of gravity of the transfer boiler and reducing the risk of vehicle overturning. The stabilizing component includes several first spring rods arranged symmetrically in a rectangle, with the bottom end of the first spring rod being rotatably connected to the top surface of the load-bearing bridge. At the same time, a mounting plate is rotatably connected to the top of the first spring rod. The mounting plate has several mounting holes for fixing the steam injection boiler. A circular plate is fixedly connected to the center of the bottom of the mounting plate, and second circular rings are rotatably connected to both sides of the circular plate. A multi-wheel steering assembly is installed at the bottom of the load-bearing bridge, located between several hydraulic rods, to actively counteract the torsional stress of the load-bearing bridge and mounting plate, thus protecting the boiler.

[0006] The above technical solution can actively adjust the boiler's posture to ensure that the boiler's center of gravity always falls within the vehicle's support surface, greatly reducing the risk of the entire vehicle overturning.

[0007] Furthermore, a first ring is rotatably connected to both sides of the second ring, and the connection direction between the second ring and the first ring is arranged in a cross shape with the connection direction between the second ring and the first drive rod. At the same time, a second spring rod is fixedly connected to both sides of the bottom of the first ring, and the other end of the second spring rod is fixedly connected to the top surface of the load-bearing bridge. A counterweight is installed at the center of the bottom of the circular plate, and a gap is provided between the counterweight and the load-bearing bridge.

[0008] Through the above technical solution, the No. 1 spring rod directly supports the weight of the boiler and provides vertical cushioning, while the No. 2 spring rod cooperates with the ring mechanism to increase horizontal stability. Its universal joint design allows the mounting plate to make multi-degree-of-freedom micro-adjustments when the frame is twisted, rather than rigidly resisting, thereby converting harmful torsional deformation into harmless mechanical motion.

[0009] Furthermore, the multi-wheel steering assembly includes a frame fixedly connected to the load-bearing bridge, and the frame has a hollow structure inside. The frame is open on both sides. Several connecting frames are linearly and equidistantly arranged inside the frame. A first worm gear is rotatably connected inside the connecting frame. A first worm is drivenly connected to the top of the first worm gear. The first worm is rotatably connected to the connecting frame, and the first worm has a hollow structure inside.

[0010] Furthermore, a second connecting plate and a first connecting plate are rotatably connected to the top and bottom of both sides of the connecting frame, respectively. A movable frame is rotatably connected between the ends of the second connecting plate and the first connecting plate away from the connecting frame. At the same time, a second turntable is rotatably connected inside the end of the movable frame away from the second connecting plate. A rotating frame is rotatably connected to the end of the movable frame away from the second connecting plate, and a first turntable is rotatably connected inside the rotating frame. Meanwhile, a wheel hub is fixedly connected to the other side of the first turntable away from the second turntable, and a tire is installed on the outside of the wheel hub.

[0011] The above technical solutions can significantly increase the wheel track on soft, muddy well site surfaces, distributing weight over a wider area and effectively preventing vehicles from sinking. When passing through narrow passages or standard trailer decks, the wheel track can be quickly narrowed, allowing a single vehicle to adapt to various extreme road conditions and transportation standards without the need to replace the vehicle or make complex modifications.

[0012] Furthermore, a shock absorber is rotatably connected to one side of the first connecting plate, and the other end of the shock absorber is rotatably connected to the connecting frame. Universal joints are fixedly connected to both sides of the first worm gear, and the other end of the universal joint passes through the interior of the movable frame and is connected and fixed to the second turntable. The second turntable is slidably connected to several first slide rods arranged symmetrically in a circle, and the end of the first slide rod away from the universal joint is rotatably connected to the second slide rod. At the same time, the second slide rod is slidably connected to the first turntable. The connection direction of the first slide rod and the second slide rod is consistent with the connection direction of the movable frame and the rotating frame.

[0013] Through the above technical solutions, the vehicle can rotate in place, move obliquely or move purely laterally with a very small radius or even zero radius. In an environment with an extremely compact well site layout and numerous equipment, this function can achieve incredibly precise positioning and maneuvering, greatly reducing the requirements for working space.

[0014] Furthermore, a rack is slidably connected to one side of the connecting frame, and the connecting frame limits the rack. At the same time, a gear meshes with the side of the rack away from the connecting frame. The gear is rotatably connected to the connecting frame, and a second worm gear is rotatably connected to the bottom of the gear. The connecting shaft of the second worm gear is fixedly connected to the gear. A second worm is driven to one side of the second worm gear, and the second worm is rotatably connected to the connecting frame. The second worm has a hollow internal structure. Adjusting rods are rotatably connected to both ends of the rack, and the other end of the adjusting rods is rotatably connected to the rotating frame, so that the rack can adapt to different angles of deflection during movement.

[0015] Furthermore, a double threaded rod is rotatably connected to the bottom of the connecting frame located at the center of the frame, and both ends of the double threaded rod are threadedly connected to two other connecting frames. At the same time, both ends of the double threaded rod are rotatably connected to the inner wall of the frame. A first worm gear located at the center of the frame is fixedly connected to a first drive rod, and both ends of the first drive rod are rotatably connected to the connecting frame. At the same time, the first drive rod is slidably connected to the first worm gear in the other two connecting frames. The first worm gear in the other two connecting frames limits the first drive rod, and both ends of the first drive rod are rotatably connected to the inner wall of the frame.

[0016] The above technical solution allows for easy access to narrow wellhead locations from any angle to complete docking, eliminating the need for large turning channels for long vehicles and redefining the flexibility of on-site deployment of heavy equipment.

[0017] Furthermore, a second worm gear is fixedly connected to a second drive rod at the bottom of the connecting frame located at the center of the frame, and the two ends of the second drive rod are rotatably connected to the connecting frame. At the same time, the two ends of the second drive rod are slidably connected to the second worm gears in the other two connecting frames. The second worm gears in the other two connecting frames limit the second drive rod, and the two ends of the second drive rod are rotatably connected to the inner wall of the frame.

[0018] Furthermore, the frame is equipped with a No. 1 motor, a No. 2 motor, and a No. 3 motor on the side facing the front of the vehicle. The output ends of the No. 1 motor, the No. 2 motor, and the No. 3 motor are respectively fixedly connected to connecting shafts. At the same time, the other ends of the connecting shafts of the output ends of the No. 1 motor, the No. 2 motor, and the No. 3 motor are respectively rotatably connected through the frame. The through ends of the connecting shafts of the No. 1 motor, the No. 2 motor, and the No. 3 motor are respectively fixedly connected to one end of the No. 1 drive rod, the double threaded rod, and the No. 2 drive rod.

[0019] Through the above technical solution, on rough roads, the wheel track of different axles can be actively adjusted or even the deflection angle can be slightly adjusted to actively counteract the torsional stress of the frame and protect the boiler body.

[0020] The beneficial effects of the present invention are as follows: (1) By adopting a stable component, the first ring, the second ring, and the circular plate at the bottom of the mounting plate rotate relative to each other during the transportation process. Moreover, the first spring rod on both sides of the bottom of the mounting plate rotates relative to the mounting plate and the load-bearing bridge to different degrees. Under the action of the counterweight, the mounting plate and the boiler on its top are kept stable, avoiding the accumulation of "internal damage" to the boiler during the transportation process. This can significantly extend its service life and overhaul interval. At the same time, it cuts off the unpredictable alternating stress that the dynamic torsional deformation of the load-bearing bridge will generate, preventing weld fatigue, local stress concentration, and even micro-cracks. (2) By adopting a multi-wheel steering assembly and three motors independently controlled (drive / steering / wheel track), the present invention achieves millimeter-level precise positioning, shortens the adjustment and positioning time in the well site, reduces the dependence on external auxiliary equipment, and at the same time, from flat roads to extreme well sites, one vehicle can handle most complex working conditions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a first-view structural schematic diagram of the load-bearing bridge of the present invention; Figure 3 This is a schematic diagram of the load-bearing bridge structure from a second perspective of the present invention; Figure 4 This is a schematic diagram of the load-bearing bridge top component structure of the present invention; Figure 5 This is a schematic diagram of the stable component structure of the present invention; Figure 6 This is a schematic diagram of the multi-wheel steering assembly structure of the present invention; Figure 7 This is a schematic diagram of the internal structure of the framework of the present invention; Figure 8 This is a schematic diagram of the structure at the connection between the first drive rod and the first drive rod of the present invention; Figure 9 yes Figure 8 A magnified structural diagram at point A; Figure 10 This is a first-view structural diagram of the connection between the connecting frame and the first connecting plate of the present invention; Figure 11 This is a second-view structural diagram of the connection between the connecting frame and the first connecting plate of the present invention.

[0022] Attached reference numerals: 11. Front of vehicle; 12. Load-bearing axle; 13. Mounting plate; 14. Hydraulic rod; 15. Tire; 2. Stabilizing assembly; 21. Spring rod No. 1; 22. Spring rod No. 2; 23. Ring No. 1; 24. Ring No. 2; 25. Circular plate; 26. Counterweight; 3. Multi-wheel steering assembly; 31. Frame; 32. Motor No. 1; 33. Motor No. 2; 34. Motor No. 3; 35. Drive rod No. 1; 36. Drive rod No. 2; 37. Double threaded rod; 3 8. Connecting frame; 39. Worm gear No. 1; 310. Worm wheel No. 1; 311. Connecting plate No. 1; 312. Connecting plate No. 2; 313. Moving frame; 314. Shock absorber; 315. Universal joint; 316. Hub; 317. Rack; 318. Adjusting rod; 319. Gear; 320. Worm gear No. 2; 321. Worm wheel No. 2; 322. Rotating frame; 323. Turntable No. 1; 324. Turntable No. 2; 325. Slide rod No. 1; 326. Slide rod No. 2. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] like Figures 1-5This embodiment illustrates a rear-wheel steering structure for a mobile steam injection boiler in an oilfield. It includes a cab 11 and a load-bearing axle 12, with the cab 11 movably connected to the load-bearing axle 12. Several rectangularly symmetrically arranged hydraulic rods 14 are rotatably connected to the bottom of the load-bearing axle 12. By using wires, the motor and hydraulic rods 14 within the multi-wheel steering assembly 3 are connected to the control system within the cab 11, enabling remote control and real-time feedback. A stabilizing assembly 2 is rotatably connected to the top of the load-bearing axle 12 to adjust the overall center of gravity of the boiler, reducing the risk of vehicle overturning. The stabilizing assembly 2 includes several rectangularly symmetrically arranged primary spring rods 21, with the bottom end of each primary spring rod 21 rotatably connected to the top surface of the load-bearing axle 12. This allows for active adjustment of the boiler's posture, ensuring the boiler's center of gravity always falls within the vehicle's support surface, significantly reducing the risk of vehicle overturning. A mounting plate 13 is rotatably connected to the top of each primary spring rod 21, with several mounting holes for fixing the steam injection boiler. Furthermore, a circular plate 25 is fixedly connected to the bottom center of the mounting plate 13, and a second ring 24 is rotatably connected to both sides of the circular plate 25. A first ring 23 is rotatably connected to both sides of the second ring 24. The first spring rod 21 directly supports the weight of the boiler and provides vertical buffering. The second spring rod 22 cooperates with the ring mechanism to increase horizontal stability. Its universal swivel connection design allows the mounting plate 13 to make small adjustments with multiple degrees of freedom when the load-bearing bridge 12 is twisted, rather than rigidly resisting, thereby converting harmful torsional deformation into harmless mechanical motion. The connection direction of the second ring 24 and the first ring 23 is arranged in a cross shape with the connection direction of the second ring 24 and the first drive rod 35. At the same time, the second spring rod 22 is fixedly connected to both sides of the bottom of the first ring 23, and the other end of the second spring rod 22 is fixedly connected to the top surface of the load-bearing bridge 12. A counterweight 26 is installed at the bottom center of the circular plate 25, and a gap is provided between the counterweight 26 and the load-bearing bridge 12.

[0025] like Figures 1-11As shown, a multi-wheel steering assembly 3 is installed at the bottom of the load-bearing bridge 12 located between several hydraulic rods 14. This assembly is used to actively counteract the torsional stress of the load-bearing bridge 12 and the mounting plate 13, protecting the boiler. The multi-wheel steering assembly 3 includes a frame 31 fixedly connected to the load-bearing bridge 12. The frame 31 has a hollow internal structure and is open on both sides. Several connecting frames 38 are linearly and equidistantly arranged inside the frame 31. A rack 317 is slidably connected to one side of each connecting frame 38. On soft, muddy well site surfaces, this assembly can significantly increase the wheel track, distributing weight over a wider area and effectively preventing the vehicle from sinking. When passing through narrow passages or standard trailer beds, the wheel track can be quickly narrowed, allowing the vehicle to adapt to various extreme conditions. The road conditions and transportation standards are consistent, requiring no vehicle replacement or complex modifications. The connecting frame 38 limits the rack 317, while a gear 319 meshes with the side of the rack 317 away from the connecting frame 38. The gear 319 is rotatably connected to the connecting frame 38, and a second worm gear 321 is rotatably connected to the bottom of the gear 319. The connecting shaft of the second worm gear 321 is fixedly connected to the gear 319. A second worm 320 is driven to one side of the second worm gear 321, and the second worm 320 is rotatably connected to the connecting frame 38. The second worm 320 has a hollow internal structure, and a second drive rod 36 is fixedly connected to the bottom of the connecting frame 38 at the center of the frame 31.

[0026] like Figures 2-11The second drive rod 36 is rotatably connected to the connecting brackets 38 at both ends, and simultaneously, the two ends of the second drive rod 36 are slidably connected to the second worm gear 320 in the other two connecting brackets 38. The second worm gear 320 in the other two connecting brackets 38 limits the second drive rod 36, and the two ends of the second drive rod 36 are rotatably connected to the inner wall of the frame 31. The worm gear in the multi-wheel steering assembly 3 adopts the existing multi-head worm gear to drive the worm wheel to rotate forward and backward. The frame 31 facing the front of the vehicle 11 is equipped with a first motor 32, a second motor 33, and a third motor 34, and the output ends of the first motor 32, the second motor 33, and the third motor 34 are respectively fixedly connected to connecting shafts. At the same time, the other ends of the connecting shafts of the output ends of the first motor 32, the second motor 33, and the third motor 34 are respectively rotatably connected to the frame 31. The through end of the output shaft of motor 34 is fixedly connected to one end of drive rod 35, double threaded rod 37, and drive rod 36. The rack 317 is rotatably connected to adjusting rods 318 at both ends, which can enable the whole vehicle to rotate in place, move obliquely or move purely laterally with a very small radius or even zero radius. In an environment with an extremely compact well site layout and numerous equipment, this function can achieve incredibly precise positioning and maneuvering, greatly reducing the requirements for working space. The other end of adjusting rod 318 is rotatably connected to rotating frame 322, which allows rack 317 to adapt to different angles of deflection during movement. The top and bottom of both sides of connecting frame 38 are rotatably connected to connecting plate 312 and connecting plate 311, respectively. Shock absorber 314 is rotatably connected to one side of connecting plate 311, and the other end of shock absorber 314 is rotatably connected to connecting frame 38.

[0027] like Figures 3-11 As shown, universal joints 315 are fixedly connected to both sides of the first worm gear 310, and the other end of the universal joint 315 passes through the interior of the movable frame 313 and is connected and fixed to the second turntable 324. The second turntable 324 is slidably connected to several first slide rods 325 arranged symmetrically in a circle, and the end of the first slide rod 325 away from the universal joint 315 is rotatably connected to the second slide rod 326. At the same time, the second slide rod 326 is slidably connected to the first turntable 323, which can easily cut into narrow spaces from any angle. At the wellhead location, docking is completed without leaving a huge turning channel for the long vehicle, redefining the flexibility of on-site deployment of heavy equipment. The connection direction of the first slide rod 325 and the second slide rod 326 is consistent with the connection direction of the moving frame 313 and the rotating frame 322. The moving frame 313 is rotatably connected between the second connecting plate 312 and the end of the first connecting plate 311 away from the connecting frame 38. At the same time, the second turntable 324 is rotatably connected inside the end of the moving frame 313 away from the second connecting plate 312.

[0028] like Figures 4-11As shown, a rotating frame 322 is rotatably connected to the end of the movable frame 313 away from the second connecting plate 312, and a first turntable 323 is rotatably connected inside the rotating frame 322. Meanwhile, a hub 316 is fixedly connected to the other side of the first turntable 323 away from the second turntable 324. A tire 15 is mounted on the outside of the hub 316. A first worm gear 310 is rotatably connected inside the connecting frame 38, and a first worm 39 is driven to the top of the first worm gear 310. The first worm 39 is rotatably connected to the connecting frame 38. A double threaded rod 37 is rotatably connected to the bottom of the connecting frame 38 located at the center of the frame 31. On rough roads, the wheel track of different axles can be actively adjusted, or even the slight deflection angle can be used to actively... To counteract the torsional stress of the frame and protect the boiler body, the double threaded rod 37 is threadedly connected to the other two connecting frames 38 at both ends. At the same time, the double threaded rod 37 is rotatably connected to the inner wall of the frame 31 at both ends. The first worm gear 39 located at the center of the frame 31 is fixedly connected to the first drive rod 35, and the first drive rod 35 is rotatably connected to the connecting frame 38 at both ends. At the same time, the first drive rod 35 is slidably connected to the first worm gear 39 in the other two connecting frames 38. The first worm gear 39 in the other two connecting frames 38 limits the first drive rod 35, and the first drive rod 35 is rotatably connected to the inner wall of the frame 31 at both ends. The first worm gear 39 is hollow inside.

[0029] The working principle of this embodiment is as follows: When the steam injection boiler needs to be transferred, the boiler is hoisted onto the mounting plate 13 by a crane, and then fixed through the mounting holes on the mounting plate 13 to ensure the boiler is stable. When the boiler is hoisted onto the mounting plate 13, its weight is transferred through the mounting plate 13 to the No. 1 spring rod 21 at the four corners of the mounting plate 13 and the No. 2 spring rod 22 at the bottom. The No. 1 spring rod 21 and the No. 2 spring rod 22 are compressed and elastically deformed. The No. 1 ring 23 and the counterweight block 26 at the bottom move down synchronously. At this time, the counterweight block 26 and the load-bearing bridge 12 still maintain a certain distance.

[0030] As the boiler is fully in place, its gravity continues to act on spring rod 21 and spring rod 22. When the pressure reaches the preset threshold, the counterweight 26 and the load-bearing bridge 12 remain relatively stationary.

[0031] The driver can then drive the vehicle to the designated location. When the vehicle travels on a bumpy road, the shock absorber 314 absorbs the impact energy through telescopic deformation. At the same time, the rotating structure between the moving frame 313 and the connecting frame 38 allows the tire 15 to adaptively adjust its angle according to the terrain, maintaining the contact between the tire 15 and the ground.

[0032] At the same time, the first ring 23, the second ring 24, and the circular plate 25 at the bottom of the mounting plate 13 rotate relative to each other, and the first spring rod 21 on both sides of the bottom of the mounting plate 13 rotates relative to the mounting plate 13 and the load-bearing bridge 12 to different degrees. Under the action of the counterweight 26, the mounting plate 13 and the boiler on top of it always remain stable, isolating the bumps, tilts and torsional deformations transmitted by the load-bearing bridge 12.

[0033] When encountering special construction sites or T-shaped roads, the driver can operate the control system in the cab to make the No. 3 motor 34 run, thereby driving the No. 2 drive rod 36 to rotate, which in turn causes the No. 2 worm gear 320 on the connecting frame 38 to rotate, driving the No. 2 worm wheel 321 to rotate, which in turn drives the gear 319 to rotate, thereby causing the rack 317 to move left and right, causing the adjusting rods 318 at both ends of the rack 317 to push the rotating frame 322 to rotate around the hinge point between it and the moving frame 313.

[0034] The rotation of the rotating frame 322 causes the hub 316 and its tire 15 to deflect inward or outward, thereby achieving dynamic adjustment of the rear wheel angle. At the same time, the first slide rod 325 and the second slide rod 326 generate relative extension and retraction movements with the first turntable 323 and the second turntable 324 during the deflection of the tire 15, and the first slide rod 325 and the second slide rod 326 generate relative rotation.

[0035] Then, the No. 1 motor 32 drives the No. 1 drive rod 35 to rotate, which in turn drives the No. 1 worm gear 39 on the No. 1 drive rod 35 to rotate. Through meshing transmission, the No. 1 worm wheel 310 in the connecting frame 38 rotates, which in turn causes the universal joints 315 on both sides of the No. 1 worm wheel 310 to rotate synchronously. This transmits the power to the No. 2 turntable 324. Then, through the linkage between the No. 2 turntable 324 and several No. 1 slide rods 325, the rotational motion is transmitted to several No. 2 slide rods 326 and the No. 1 turntable 323, ultimately driving all the tires 15. This allows the rear axle of the vehicle to rotate in place, move diagonally, or move purely laterally with a very small radius or even zero radius, achieving precise control and flexible steering of the vehicle in narrow spaces.

[0036] When the vehicle encounters soft, muddy well site roads, the hydraulic rod 14 can be driven to lift the entire rear axle of the vehicle. Then, the No. 2 motor 33 drives the double threaded rod 37 to rotate, thereby causing the two sets of connecting frames 38 in the frame 31 to move in opposite or separate directions around the origin of the connecting frame 38 at the center. This adjusts the rear wheel spacing, distributes the weight over a wider area, and effectively prevents the vehicle from sinking.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A rear-wheel steering structure for a mobile steam injection boiler in an oilfield, comprising a cab (11) and a load-bearing axle (12), wherein the cab (11) and the load-bearing axle (12) are movably connected, and a plurality of hydraulic rods (14) arranged in a rectangular symmetrical configuration are rotatably connected to the bottom of the load-bearing axle (12), characterized in that: The top of the load-bearing bridge (12) is rotatably connected to a stabilizing component (2), which is used to adjust the overall center of gravity of the transfer boiler and reduce the risk of vehicle overturning; The stabilizing component (2) includes several first spring rods (21) arranged in a rectangular symmetrical manner. The bottom end of the first spring rod (21) is rotatably connected to the top surface of the load-bearing bridge (12). At the same time, the top end of the first spring rod (21) is rotatably connected to a mounting plate (13). The mounting plate (13) has several mounting holes for fixing the steam injection boiler. A circular plate (25) is fixedly connected to the bottom center of the mounting plate (13). At the same time, second rings (24) are rotatably connected to both sides of the circular plate (25). The load-bearing bridge (12) located between several hydraulic rods (14) has a multi-wheel steering assembly (3) installed at the bottom to actively counteract the torsional stress of the load-bearing bridge (12) and the mounting plate (13) and protect the boiler.

2. The rear wheel steering structure of a mobile steam injection boiler in an oilfield according to claim 1, characterized in that, The No. 2 ring (24) is rotatably connected to the No. 1 ring (23) on both sides, and the connection direction of the No. 2 ring (24) and the No. 1 ring (23) is arranged in a cross shape with the connection direction of the No. 2 ring (24) and the No. 1 drive rod (35). At the same time, the No. 2 spring rod (22) is fixedly connected to the bottom two sides of the No. 1 ring (23). The other end of the No. 2 spring rod (22) is fixedly connected to the top surface of the load-bearing bridge (12). A counterweight (26) is installed at the bottom center of the circular plate (25), and a gap is provided between the counterweight (26) and the load-bearing bridge (12).

3. The rear wheel steering structure of a mobile steam injection boiler in an oilfield according to claim 1, characterized in that, The multi-wheel steering assembly (3) includes a frame (31) fixedly connected to the load-bearing bridge (12), and the frame (31) is hollow inside. The frame (31) is open on both sides. Several connecting frames (38) are linearly and equidistantly arranged inside the frame (31). A first worm wheel (310) is rotatably connected inside the connecting frame (38). A first worm (39) is drivenly connected to the top of the first worm wheel (310). The first worm (39) is rotatably connected to the connecting frame (38), and the first worm (39) is hollow inside.

4. The rear wheel steering structure of an oilfield mobile steam injection boiler according to claim 3, characterized in that, The top and bottom sides of the connecting frame (38) are respectively rotatably connected to the second connecting plate (312) and the first connecting plate (311), and a movable frame (313) is rotatably connected between the second connecting plate (312) and the first connecting plate (311) away from the connecting frame (38). At the same time, the second turntable (324) is rotatably connected inside the movable frame (313) away from the second connecting plate (312). The movable frame (313) is rotatably connected to the rotating frame (322) away from the second connecting plate (312), and the first turntable (323) is rotatably connected inside the rotating frame (322). At the same time, a wheel hub (316) is fixedly connected to the other side of the first turntable (323) away from the second turntable (324). A tire (15) is installed on the outside of the wheel hub (316).

5. The rear wheel steering structure of an oilfield mobile steam injection boiler according to claim 4, characterized in that, A shock absorber (314) is rotatably connected to one side of the first connecting plate (311), and the other end of the shock absorber (314) is rotatably connected to the connecting frame (38). Universal connecting rods (315) are fixedly connected to both sides of the first worm gear (310), and the other end of the universal connecting rod (315) passes through the interior of the moving frame (313) and is connected and fixed to the second turntable (324). The second turntable (324) is slidably connected to several first sliding rods (325) arranged symmetrically in a circle, and the end of the first sliding rod (325) away from the universal connecting rod (315) is rotatably connected to the second sliding rod (326). At the same time, the second sliding rod (326) is slidably connected to the first turntable (323). The connection direction of the first sliding rod (325) and the second sliding rod (326) is consistent with the connection direction of the moving frame (313) and the rotating frame (322).

6. The rear wheel steering structure of an oilfield mobile steam injection boiler according to claim 4, characterized in that, A rack (317) is slidably connected through one side of the connecting frame (38), and the connecting frame (38) limits the rack (317). At the same time, a gear (319) meshes with the side of the rack (317) away from the connecting frame (38). The gear (319) is rotatably connected to the connecting frame (38), and a second worm gear (321) is rotatably connected to the bottom of the gear (319). The connecting shaft of the second worm gear (321) is connected to the gear (319). The connection is fixed. The second worm gear (321) is connected to the second worm (320) on one side, and the second worm (320) is rotatably connected to the connecting frame (38). At the same time, the second worm (320) is hollow inside. The rack (317) is rotatably connected to the two ends of the rack (318), and the other end of the adjusting rod (318) is rotatably connected to the rotating frame (322), so that the rack (317) can adapt to different angles of deflection during movement.

7. The rear wheel steering structure of an oilfield mobile steam injection boiler according to claim 6, characterized in that, The bottom of the connecting frame (38) located at the center of the frame (31) is rotatably connected to a double threaded rod (37), and the two ends of the double threaded rod (37) are threadedly connected to the other two connecting frames (38). At the same time, the two ends of the double threaded rod (37) are rotatably connected to the inner wall of the frame (31). The first worm (39) located at the center of the frame (31) is fixedly connected to a first drive rod (35), and the two ends of the first drive rod (35) are rotatably connected to the connecting frame (38). At the same time, the first drive rod (35) is slidably connected to the first worm (39) in the other two connecting frames (38). The first worm (39) in the other two connecting frames (38) limits the first drive rod (35), and the two ends of the first drive rod (35) are rotatably connected to the inner wall of the frame (31).

8. The rear wheel steering structure of a mobile steam injection boiler in an oilfield according to claim 7, characterized in that, The second worm gear (320) at the bottom of the connecting frame (38) located at the center of the frame (31) is fixedly connected to the second drive rod (36), and the two ends of the second drive rod (36) are rotatably connected to the connecting frame (38). At the same time, the two ends of the second drive rod (36) are slidably connected to the second worm gear (320) in the other two connecting frames (38). The second worm gear (320) in the other two connecting frames (38) limits the second drive rod (36), and the two ends of the second drive rod (36) are rotatably connected to the inner wall of the frame (31).

9. The rear wheel steering structure of a mobile steam injection boiler in an oilfield according to claim 8, characterized in that, The frame (31) is equipped with a No. 1 motor (32), a No. 2 motor (33), and a No. 3 motor (34) on the side facing the front of the vehicle (11). The output ends of the No. 1 motor (32), the No. 2 motor (33), and the No. 3 motor (34) are respectively fixedly connected to connecting shafts. At the same time, the other end of the output end connecting shaft of the No. 1 motor (32), the No. 2 motor (33), and the No. 3 motor (34) is respectively rotatably connected to the frame (31). The through end of the output end connecting shaft of the No. 1 motor (32), the No. 2 motor (33), and the No. 3 motor (34) is respectively fixedly connected to one end of the No. 1 drive rod (35), the double threaded rod (37), and the No. 2 drive rod (36).

Images