WO2023000635A1

WO2023000635A1 - Variable-wheel-track main machine towing system and using method therefor

Info

Publication number: WO2023000635A1
Application number: PCT/CN2022/072905
Authority: WO
Inventors: 王瑞; 王刚; 杨淑娟; 陈祖波; 赵小葵; 肖淋中
Original assignee: 四川宏华石油设备有限公司
Priority date: 2021-07-19
Filing date: 2022-01-20
Publication date: 2023-01-26
Also published as: CN113602387A; CN113602387B

Abstract

A variable-wheel-track main machine towing system and a using method therefor. The variable-wheel-track main machine towing system comprises: bases (1), rotating bases (2), rotating shafts (3), supporting frames (4), wheels (5), portal frames (6), wheel rotating shafts (7), and traction mechanisms (17). There are two bases (1) and the wheels (5) are arranged at both ends of each base (1); the same ends of the two bases (1) are respectively provided with base shaft holes (101), and the two rotating shafts (3) are respectively arranged in the two base shaft holes (101); each rotating shaft (3) is hingedly connected to one base (1) and one rotating base (2); the two supporting frames (4) are detachably arranged on the two rotating bases (2), respectively; the two portal frames (6) are arranged on the two wheels (5), respectively; each portal frame (6) is rotatably connected to the corresponding supporting frame (4) by means of the wheel rotating shaft (7).

Description

A variable wheel base host trailer system and its use method

This application claims the priority of the Chinese patent application submitted to the China Patent Office on July 19, 2021 with the application number 202110815801.3. References are incorporated in this application.

technical field

The invention relates to the field of main engine towing equipment, in particular to a variable wheelbase main engine towing system and a method for using the same.

Background technique

In the desert environment, using the main engine tow is the fastest and most convenient way to move the drilling rig. The main engine towing equipment is similar in style. They all adopt tire mechanisms on the base and both ends of the base, and use hydraulic devices to jack up the drilling rig before installing the tires. , and then quickly reach the predetermined well position through the traction of the tractor. The relocation time and efficiency requirements of desert drilling rigs are constantly increasing. It is required that the drilling rig does not use a crane to move quickly when moving, and the host trailer must meet the requirements of the inner width of the tire when passing the square well and the outer width of the tire when driving on the road. . However, the existing main engine trailer device cannot change the wheelbase. It is necessary to lift the trailer assembly by a crane and switch the installation position of the trailer assembly to change the wheelbase. The lifting and disassembly of the trailer assembly is time-consuming and laborious, which seriously affects the relocation of the rig work efficiency.

Contents of the invention

The object of the present invention is to solve the problem that the main engine trailer device cannot change the wheel base, and provide a variable wheel base main engine trailer system to realize the free change of the wheel base of the main engine trailer system, so as to meet the inner tire requirements when passing the square well. Width requirements, as well as the outer width requirements of the tires when driving on the road, so as to improve the convenience of drilling rigs.

In order to achieve the above object, the present invention provides a traction system for variable wheelbase main engine, comprising: a base, a rotating base, a rotating shaft, a support frame, wheels, portal frames, wheel shafts and a traction mechanism, the number of the bases is two and each of the two ends of the base is provided with the wheels, and the same end of the two bases is respectively provided with a base shaft hole, and the two rotation shafts are respectively arranged in the two base shaft holes, Each of the rotating shafts is hingedly connected to one of the bases and one of the rotating seats, the two supporting frames are respectively detachably arranged on the two rotating seats, and the two portal frames are respectively arranged on the two rotating seats. On the two wheels, each gantry is rotatably connected to the support frame through the wheel shaft, so that the two wheels at one end of the base can approach or move away from each other, and the traction The mechanism detachably connects the two portal frames.

In the present invention, the revolving seat is hinged with the base through the rotating shaft, the support frame is arranged on the revolving seat, the gantry is arranged on the wheel, the gantry is hinged through the wheel shaft and the support frame, and the two bases are connected by a cross-link during use. Or the equipment carried by the base is connected as a whole. The two wheels at the same end of the base can be close to or far away from each other. After the distance between the two wheels is adjusted in place, the distance between the two wheels is relatively fixed. The two wheels can be close to or far away from each other, which can not only meet the large wheel base requirements of the wheels when passing the square well, but also meet the small wheel base requirements of road transportation. Moving is more convenient and improves the work efficiency of drilling rig moving.

Optionally, base shaft holes are provided at both ends of each base, and the four rotating shafts are respectively arranged in the four base shaft holes, and each of the rotating shafts is hingedly connected to one of the bases and One said swivel seat, each of said swivel seats is detachably connected with said support frame, said gantry frame is arranged on said four wheels, and each said gantry frame passes through said wheel The rotating shaft is rotatably connected with the support frame, so that the two wheels at the same end of the base can approach or move away from each other, and the two portal frames at both ends of the base are connected by the traction mechanism.

Optionally, the traction mechanism includes: a connecting frame, a traction frame and a tie rod, the traction mechanism includes: a connecting frame, a traction frame and a tie rod, and the connecting frame is detachably connected On one side of the base, the tie rod is detachably connected to the connecting frame through the traction frame, and the tie rod and the traction frame are detachably hinged.

Optionally, the trailer system for the variable wheelbase main engine further includes: a first telescopic rod, both ends of the first telescopic rod are respectively hinged between the base and the rotating seat.

Optionally, the trailer system for variable wheel base main engine further includes: a second telescopic rod and a steering arm, both ends of the second telescopic rod are respectively hinged between the wheel shaft and the support frame, and the first The two telescopic rods are connected with the wheel shaft through the steering arm.

Optionally, the traction system for the variable wheel base main engine further includes: a first telescopic rod, the first telescopic rod is arranged between the base and the rotating seat; the first telescopic rod and/or the The second telescopic rod is a hydraulic cylinder.

Optionally, the traction system of the variable wheel base main engine further includes: a hinge shaft and an insert, the side of the rotating base away from the wheel is connected to the support frame through the hinge shaft, and the rotating base is close to the One side of the wheel is connected to the support frame through the insert.

Optionally, the insert includes: a connecting pin or a hydraulic cylinder.

Optionally, a locking device is provided between the base and the rotating seat, and the locking device includes: a limit block, one end of which is rotatably arranged on the rotating seat, the The base is provided with at least one limiting slot capable of partially accommodating the limiting block; The limit groove of the limit block.

The present invention also provides a method for using the variable wheel base main engine trailer system, which includes the following steps:

Step 1: connecting a steering power device between the base and the swivel seat and between the wheel shaft and the support frame;

Step 2: After jacking up the base with a jacking cylinder, connect the support frame with the swivel seat;

Step 3: adjust the angle between the base and the swivel seat through the steering power device according to the needs of transportation;

Step 4: Connect the traction mechanism for connecting the tractor with the portal frame.

The beneficial effects of the present invention are:

1. In the present invention, the revolving seat is hinged with the base through the rotating shaft, the support frame is arranged on the revolving seat, the portal frame is arranged on the wheel, and the portal frame is hinged through the wheel shaft and the support frame. The equipment carried by the frame or the base is connected as a whole. The two wheels at the same end of the base can be close to or far away from each other. The two wheels at the end can be close to or far away from each other, which can not only meet the requirements of the large wheel base when passing the square shaft, but also meet the requirements of the small wheel base of road transportation. , the drilling rig is more convenient to move, and the work efficiency of the drilling rig is improved;

2. Drive the swivel seat to rotate through the first telescopic rod, and drive the wheel shaft to rotate through the second telescopic rod, realizing the automatic adjustment of the track of the wheel;

3. The hinged support frame and swivel seat can be quickly locked or released through the hydraulic cylinder, and the support frame and wheels can rotate around the hinge axis, so that the variable wheel base main engine trailer system can quickly switch between the running state and the working state;

4. The base and the swivel seat can be locked in multiple positions through the locking device to prevent the relative rotation between the base and the swivel seat during the running of the trailer system of the variable wheel base main engine.

Description of drawings

Fig. 1 is a three-dimensional diagram of the variable wheel base main engine trailer system;

Fig. 2 is a top view of the small wheelbase state of the trailer system of the variable wheelbase main engine;

Fig. 3 is the top view of the large wheelbase state of the variable wheelbase main engine trailer system;

Fig. 4 is the side view of variable wheel base main engine towing system;

Fig. 5 is a schematic diagram of upright transportation of the derrick base of the variable wheel base main engine towing system;

Fig. 6 is a top view of the trailer system of the variable wheelbase main engine in Fig. 5;

Fig. 7 is an exploded schematic view of the swivel seat and the base of the variable wheel base main engine trailer system;

Fig. 8 is the schematic diagram of the wheels of the variable wheel base main engine trailer system;

Fig. 9 is a schematic diagram of steering in a small wheelbase state of the variable wheelbase main engine trailer system;

Fig. 10 is a large wheelbase state steering schematic diagram of the variable wheelbase main engine trailer system;

FIG. 11 is an enlarged schematic diagram of point A in FIG. 1 .

Marks in the figure: 1-base, 101-base shaft hole, 102-limiting groove, 2-rotary seat, 201-rotary seat hole, 3-rotary shaft, 4-support frame, 5-wheel, 6-gantry frame , 7-wheel shaft, 8-connecting frame, 9-first telescopic rod, 10-second telescopic rod, 11-steering arm, 12-limit block, 13-traction frame, 14-tie rod, 15-hinge shaft , 16-insert, 17-traction mechanism, 18-cross-link, 19-ear seat.

detailed description

Using the main engine towing is the fastest and most convenient way to move the drilling rig. The main engine towing equipment is similar in style, and they all adopt tire mechanisms on the base and both ends of the base. When the drilling rig leaves the original well position, it needs to cross the wellhead, and the trailer device needs to provide a large wheelbase; when the main engine is towed to achieve road transportation, especially when the road width is less than 8m, it needs to narrow the wheelbase to achieve it. Due to the narrow wheelbase anti-overturning ability Poor, it cannot support the transportation with the derrick, only the base can be transported separately. The existing main engine trailer device cannot change the wheelbase. It is necessary to lift the trailer assembly by a crane and switch the installation position of the trailer assembly to change the wheelbase. The lifting and disassembly of the trailer assembly is time-consuming and laborious, which seriously affects the work of relocation efficiency. In order to improve the convenience of drilling rig moving, the inventor has designed a variable wheel base main engine trailer system and its use method, which can realize the free transformation of the wheel base of the main engine trailer system.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

Fig. 1 is a three-dimensional view of the variable wheel-base main engine towing system, Fig. 2 is a top view of the variable wheel-base main engine towing system in a small wheelbase state, Fig. 3 is a top view of the variable wheel-base main engine towing system in a large wheelbase state, and Fig. 4 It is a side view of the traction system of the variable wheel-base main engine. Fig. 5 is a schematic diagram of the upright transportation of the derrick base of the variable wheel-base main engine towing system. Fig. 6 is a top view of the traction system of the variable wheel-base main engine in Fig. 5. The disassembled schematic diagram of the swivel base and the base of the main engine trailer system, Fig. 8 is a schematic diagram of the wheels of the variable wheel pitch main engine trailer system, Fig. 9 is a small wheelbase steering schematic diagram of the variable wheel pitch host trailer system, and Fig. 10 is a schematic diagram of variable wheel pitch host trailer system. The steering diagram of the large wheelbase state of the main engine trailer system with variable wheelbase is shown in Figure 1-Figure 10. 5. Portal frame 6, wheel shaft 7 and traction mechanism 17. The two bases 1 are arranged at intervals and the two ends of each base 1 are provided with the wheels 5, and the same ends of the two bases 1 are respectively provided with base shaft holes 101, and each of the rotating shafts 3 Both are arranged in the shaft hole 101 of the base and hingedly connect the base 1 and the swivel base 2 . The two supporting frames 4 are respectively detachably arranged on the two rotating seats 2, and the two portal frames 6 are respectively arranged on the two wheels 5, and each of the portal frames 6 The wheel shaft 7 is rotatably connected to the support frame 4 . The traction mechanism 17 is connected with the two gantry frames 6, so that the distance between the two wheels is relatively fixed after the wheelbase is adjusted in place. The traction mechanism 17 is also used to connect with a tractor, and the tractor pulls or pushes the wheel 5 forward or backward. The other end of base 1 is provided with non-adjustable wheels as mentioned in the background art, wheels whose wheel track can be adjusted by changing installation positions, or wheels whose wheel track can be adjusted in other ways. In the present invention, the rotating base 2 is hinged with the base 1 through the rotating shaft 3, the support frame 4 is arranged on the rotating base 2, the portal frame 6 is arranged on the wheel 5, and the portal frame 6 is hinged through the wheel rotating shaft 7 and the supporting frame 4. When the two bases 1 are connected as a whole through the cross-link frame 18 or the equipment carried by the base 1, the distance between the two bases 1 remains constant, and the two wheels 5 at the same end of the base 1 can be close to or far away from each other. After the distance between the two wheels 5 is adjusted in place, it is connected by the traction mechanism 17, so that the distance between the two wheels 5 is relatively fixed. Since the two wheels 5 at the same end of the base 1 can be close to or far away from each other, the distance between the wheels when passing the square well can be satisfied. Large wheelbase requirements can meet the small wheelbase requirements of road transportation, and at the same time, it can avoid lifting and dismantling the wheels to adjust the wheelbase, greatly reducing manpower work, making it more convenient to move the drilling rig, and improving the work efficiency of the drilling rig moving.

Example 2

Referring to Fig. 1-Fig. 10, the variable wheel base host trailer system includes: a base 1, a swivel base 2, a swivel shaft 3, a support frame 4, a wheel 5, a portal frame 6, a wheel shaft 7 and a traction mechanism 17 . The two bases 1 are arranged at intervals, and base shaft holes 101 are provided at both ends of each base 1, and the four rotating shafts 3 are respectively arranged in the four base shaft holes 101, and each of the rotating The shafts 3 are hingedly connected to one of the bases 1 and one of the swivel seats 2, each of the swivel seats 2 is detachably connected to the support frame 4, and the four wheels 5 are all provided with the doors Each of the portal frames 6 is rotatably connected to the support frame 4 through the wheel shaft 7, so that the two wheels 5 at the same end of the base 1 can approach or move away from each other, The two gantry frames 6 at both ends of the base 1 are connected by the traction mechanism. Because the wheels 5 at both ends of the base 1 can easily adjust the wheelbase, further reducing manpower work, the drilling rig is more convenient to move, and the work efficiency of the drilling rig is improved. During the use of the variable wheel base main engine trailer system, the two bases 1 are connected as a whole through the cross-link frame 18 or the equipment carried by the base 1, so that the distance between the two bases 1 remains unchanged. Referring to Fig. 5 and Fig. 6, in the state of wide road transportation, the wheel base of wheel 5 is adjusted to a large wheel base, and the derrick base can be transported upright; referring to Fig. 2, in the state of narrow road transportation, the wheel base of wheel 5 is adjusted to be small. Wheelbase, base is transported separately; Drilling rig working state, the wheelbase of wheel 5 is adjusted to large wheelbase, and traction mechanism 17 is idle.

1-10, the traction mechanism 17 includes: a connecting frame 8, a traction frame 13 and a tie rod 14, the connecting frame 8 is arranged on the side of the portal frame 6 away from the base 1, so The tie rod 14 is connected to the connecting frame 8 through the traction frame 13, and the two gantry frames 6 at both ends of the base 1 are connected through the traction mechanism. Both the connecting frame 8 and the traction frame 13 are triangular in shape, one side of the connecting frame 8 is connected to the side frame of the portal frame 6, and the two side frames of the portal frame 6 are connected to two connecting frames 8 , two corners of the two connecting frames 8 are hingedly connected to one side of the traction frame 13 . The connecting frame 8, the traction frame 13 and the tie rod 14 are all detachable. The two traction frames 13 are arranged on the same tie rod 14, so that the track of the traction system of the variable wheel base main engine remains fixed during the running process. In addition, the connecting frame 8, the traction frame 13 and the tie rod 14 are arranged so that the portal frame 6 and the traction Car connection is more convenient. The wheels 5 are provided with a braking device, and the variable wheel pitch main engine trailer system can be braked by the tractor and the braking device provided on the wheels 5 during the running process. The braking device includes: a hydraulic caliper and a friction disc, the hydraulic caliper is arranged on the portal frame 6 , and the friction disc is arranged on the axle of the wheel 5 .

Referring to Fig. 1-Fig. 10, the trailer system of variable wheelbase main engine also includes: a first telescopic rod 9, and the two ends of the first telescopic rod 9 are hingedly connected to the base 1 and the swivel base 2 respectively. between. The traction system of the variable wheel base main engine further includes: a second telescopic rod 10 , the two ends of the second telescopic rod 10 are respectively hinged between the wheel shaft 7 and the support frame 4 . When the wheelbase needs to be adjusted, the two wheels 5 are made close to or far away from each other through the first telescopic rod 9, and the traction mechanism is installed after the wheelbase is adjusted so that the distance between the two wheels 5 is relatively fixed. The second telescopic rod 10 adjusts the angle of the wheel 5 relative to the base 1, and controls the track-variable main engine trailer system to go straight or turn. As a preferred embodiment, the first telescopic rod 9 and the second telescopic rod 10 are hydraulic cylinders, and the hydraulic cylinders include a cylinder barrel and a piston rod. Specifically, the cylinder barrel of a hydraulic oil cylinder is rotatably arranged on the base 1 through the ear seat 19 , and the piston rod in the cylinder barrel is hinged with the rotating seat 2 through the ear seat 19 . The cylinder barrel of another hydraulic oil cylinder is rotatably arranged on the support frame 4 through the ear seat 19, and the piston rod in the cylinder barrel is connected with the steering arm 11 through the ear seat 19, and the steering arm 11 is arranged on the support frame 4 and passes through The wheel shaft 7 of the support frame 4 is connected. Under the condition that the thrust is satisfied, the first telescopic rod 9 and the second telescopic rod 10 can also be set as electric telescopic rods, pneumatic telescopic rods or other linear motion actuators. The rotating base 2 is driven to rotate by the first telescopic rod 9, and the wheel rotating shaft 7 is driven to rotate by the second telescopic rod 10, so that the automatic adjustment of the track of the wheel 5 is realized.

Referring to Fig. 1-Fig. 10, the main engine trailer system with variable wheel base also includes: an articulated shaft 15 and an insert 16, the side of the swivel base 2 away from the wheel 5 passes through the articulated shaft 15 and the The support frame 4 is connected, and the side of the swivel seat 2 close to the wheel 5 is connected to the support frame 4 through the insert 16 . Specifically, the upper part of the swivel seat 2 near the wheel 5 is provided with an oblique angle, and the support frame 4 is provided with an oblique surface opposite to it. The hinge shaft 15 is arranged on the upper part of the bevel and away from the wheel 5 , and the insert 16 is arranged on the lower part of the bevel and close to the wheel 5 . The insert 16 includes: a connecting pin or a hydraulic cylinder. When the drilling rig is working, the insert 16 is in a disengaged state, and the support frame 4 and the wheels 5 can rotate upward around the hinge shaft 15; when the drilling rig is moving, the base 1 is lifted upward by the jacking device, The support frame 4 and the wheel 5 can rotate downwards around the hinge shaft 15, and insert the insert 16 after turning in place to lock between the support frame 4 and the swivel seat 2, and the jacking device will The base 1 is carried by the wheels 5 after being lowered. The jacking device can be arranged on the base 1 and lowered as a part of the trailer system of the variable wheelbase main engine. In the present invention, the hinged support frame 4 and the swivel seat 2 can be quickly locked or released through the hydraulic cylinder, and the support frame 4 and the wheel 5 can rotate around the hinge shaft 15, so that the variable wheel base main engine trailer system can be quickly and easily in the running state and working state. switch.

FIG. 11 is an enlarged schematic diagram of A in FIG. 1 . Referring to FIGS. 1-11 , a locking device is provided between the base 1 and the rotating base 2 . The locking device includes: a limiting block 12, one end of which is rotatably arranged on the rotating seat 2, and at least one seat capable of partially accommodating the limiting block 12 is provided on the base 1. A limiting slot 102 ; or one end of the limiting block 12 is rotatably disposed on the base 1 , and at least one limiting slot 102 capable of partially accommodating the limiting block 12 is provided on the rotating base 2 . The base 1 and the swivel base 2 can be locked in multiple positions by the locking device, so as to prevent the relative rotation between the base 1 and the swivel base 2 during the traveling process of the trailer system of the variable wheel pitch main engine.

Before the first use of the variable wheel base host dragging system, the rotating base 2 and the base 1 are hingedly connected through the rotating shaft 3, and the portal frame 6 is installed on the wheels 5, and the The wheel shaft 7 is hingedly connected to the support frame 4 and the portal frame 6 , and is hingedly connected to the support frame 4 and the swivel seat 2 through the hinge shaft 15 .

The use method of the main engine trailer system with variable wheelbase includes adjusting the wheelbase to realize the high-level overall transportation of the derrick base and the low-level overall transportation of the derrick base. Specifically, before the drilling rig is moved, a steering power device is connected between the base 1 and the rotating seat 2 and between the wheel shaft 7 and the support frame 4, and the steering power device is the first Telescopic rod 9 and the second telescopic rod. After jacking up the base 1 with the jacking cylinder, the support frame 4 is connected with the swivel seat 2 through the insert 16. When the drilling rig leaves the original well position, it needs to cross the wellhead, and it is necessary to increase the wheel base of the variable wheel base main engine dragging system, and adjust the angle between the base 1 and the swivel base 2 through the first telescopic rod 9, so that the two The wheelbase between the two wheels 5 increases, and after adjustment, the base 1 and the swivel seat 2 are locked by the limit block 12 . Finally, the traction mechanism 17 for connecting the tractor is connected with the portal frame 6 .

The use method of the variable wheel-base main engine trailer system includes adjusting the wheelbase to realize independent transportation and narrow road transportation of the variable wheel-base main engine trailer system. Specifically, before the drilling rig is moved, a steering power device is connected between the base 1 and the rotating seat 2 and between the wheel shaft 7 and the support frame 4, and the steering power device is the first Telescopic rod 9 and the second telescopic rod. After jacking up the base 1 with the jacking cylinder, the support frame 4 is connected with the swivel base 2 through the insert 16 . The narrow wheel base has poor anti-overturning ability and cannot support the transportation with a derrick. When transporting on a narrow road, the corresponding narrow wheel base must also be used for transportation. The first telescopic link 9 adjusts the angle between the base 1 and the swivel seat 2, so that the wheel base between the two wheels 5 is reduced, and after adjustment, the base 1 and the rotating base 2 are connected by the stopper 12. The rotating seats 2 are locked. Finally, the traction mechanism 17 for connecting the tractor is connected with the portal frame 6 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims

A main engine trailer system with variable wheelbase, characterized in that it includes: a base, a rotating base, a rotating shaft, a support frame, wheels, portal frames, wheel shafts and a traction mechanism, the number of the bases is two and each Both ends of the base are provided with the wheels, and the same end of the two bases is respectively provided with a base shaft hole, and the two rotating shafts are respectively arranged in the two base shaft holes, and each of the rotating The shafts are hingedly connected to one of the bases and one of the swivel seats, each of the swivel seats is detachably provided with a support frame, and the two gantry frames are arranged on the two wheels correspondingly. Each of the gantry frames is rotatably connected to the support frame through the wheel shaft, so that the two wheels at one end of the base can approach or move away from each other, and the traction mechanism can detachably connect the two wheels. one of the portal frames.
According to claim 1, the trailer system for variable wheelbase main engine is characterized in that base shaft holes are provided at both ends of each base, and the four rotating shafts are respectively arranged in the four base shaft holes. Each of the rotating shafts is hingedly connected to one of the bases and one of the rotating seats, each of the rotating seats is detachably connected to the support frame, and the four wheels are provided with the gate Each of the portal frames is rotatably connected to the support frame through the wheel shaft, so that the two wheels at the same end of the base can approach or move away from each other, and the two wheels at the two ends of the base The portal frames are all connected through the traction mechanism.
According to claim 1 or 2, the traction system of variable wheel base main engine, characterized in that, the traction mechanism comprises: a connecting frame, a traction frame and a tie rod, and the connecting frame is detachably connected to a place far away from the portal frame. One side of the base, the tie rod is detachably connected to the connecting frame through the traction frame, and the tie rod and the traction frame are detachably hinged.
According to the variable wheel base main engine trailer system according to claim 1, it is characterized in that, the variable wheel pitch main engine trailer system further comprises: a first telescopic rod, the two ends of the first telescopic rod are respectively hinged on the base and the between the swivel seats.
According to claim 1 or 4, the traction system for variable wheelbase main engine, characterized in that, the traction system for variable wheelbase main engine further comprises: a second telescopic rod and a steering arm, the two ends of the second telescopic rod are respectively hinged Between the wheel shaft and the support frame, the second telescopic link is connected to the wheel shaft through a steering arm.
According to the variable wheel base main engine trailer system according to claim 5, it is characterized in that, the variable wheel pitch host trailer system further comprises: a first telescopic rod, and the first telescopic rod is arranged on the base and the rotating Between the seats; the first telescopic rod and/or the second telescopic rod are hydraulic cylinders.
According to the trailer system of variable wheel base main engine according to claim 1, characterized in that, the trailer system of variable wheel pitch main engine further comprises: a hinge shaft and an insert, and the side of the swivel seat far away from the wheel passes through the hinge The shaft is connected to the support frame, and the side of the swivel seat close to the wheel is connected to the support frame through the insert.
According to the trailer system for variable wheel pitch main engine according to claim 7, it is characterized in that the inserting part comprises: a connecting pin or a hydraulic oil cylinder.
According to the trailer system of variable wheel base main engine according to claim 1, it is characterized in that a locking device is arranged between the base and the rotating base, and the locking device comprises: a limit block, the limit block One end is rotatably arranged on the rotating seat, and the base is provided with at least one limiting groove capable of partially accommodating the limiting block; or one end of the limiting block is rotatably arranged on the base, At least one limiting groove capable of partially accommodating the limiting block is provided on the rotating seat.
A method for using the variable wheelbase main engine trailer system according to any one of claims 1-9, characterized in that it comprises the following steps:

Step 1: connecting a steering power device between the base and the swivel seat and between the wheel shaft and the support frame;

Step 2: After jacking up the base with a jacking cylinder, connect the support frame with the swivel seat;

Step 3: adjust the angle between the base and the swivel seat through the steering power device according to the needs of transportation;

Step 4: Connect the traction mechanism for connecting the tractor with the portal frame.