CN112249155B - Hydraulic four-wheel active steering system of backhoe loader, working method and application - Google Patents
Hydraulic four-wheel active steering system of backhoe loader, working method and application Download PDFInfo
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- CN112249155B CN112249155B CN202011209510.1A CN202011209510A CN112249155B CN 112249155 B CN112249155 B CN 112249155B CN 202011209510 A CN202011209510 A CN 202011209510A CN 112249155 B CN112249155 B CN 112249155B
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000001360 synchronised effect Effects 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 31
- 230000007246 mechanism Effects 0.000 claims description 22
- 239000010720 hydraulic oil Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 5
- 238000005299 abrasion Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000000245 forearm Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- B60B35/00—Axle units; Parts thereof ; Arrangements for lubrication of axles
- B60B35/004—Mounting arrangements for axles
- B60B35/006—Mounting arrangements for axles with mounting plates or consoles fitted to axles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
- B62D21/18—Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17
- B62D21/186—Understructures, i.e. chassis frame on which a vehicle body may be mounted characterised by the vehicle type and not provided for in groups B62D21/02 - B62D21/17 for building site vehicles or multi-purpose tractors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/08—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by type of steering valve used
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/225—Control of steering, e.g. for hydraulic motors driving the vehicle tracks
Abstract
The invention discloses a hydraulic four-wheel active steering system of an excavating loader and a working method and application thereof, comprising a steering wheel, wherein the steering wheel is connected with a steering gear, the steering gear is connected with a gear pump through a priority valve, an A port of the steering gear is connected with an electromagnetic valve A, and a B port of the steering gear is connected with an electromagnetic valve B; the electromagnetic valve A and the electromagnetic valve B are connected with a synchronous valve, the synchronous valve is respectively connected with a front axle steering oil cylinder and a rear axle steering oil cylinder, and the front axle steering oil cylinder and the rear axle steering oil cylinder are both arranged on a driving steering axle and respectively control tires of front wheels and rear wheels. Compared with the hinged steering system of the traditional loader, the hydraulic four-wheel active steering system has better stability and smaller turning radius, and can not generate abrasion of the hinged part of the loader, so that the service life is longer. Compared with the traditional tractor type system, the system has the advantages that the two ends are busy, the system is in four-wheel steering and four-wheel driving, and the driving force is stronger in a severe environment or a muddy environment.
Description
Technical Field
The invention relates to the technical field of double-end busy excavating loaders and off-road forklifts, in particular to a hydraulic steering system of the double-end busy excavating loader.
Background
The backhoe loader is a single unit composed of three pieces of construction equipment. Commonly known as "busy at both ends". During construction, an operator can change the working end by only rotating the seat. The backhoe loader is compact compared to large single-function equipment (e.g., a track-type excavator). But also can move around on various building sites and even run on roads.
Most of the existing double-end busy excavating loaders are modified by the traditional loaders, and a set of excavating device of the excavator is additionally arranged behind the traditional loaders, so that the double-end busy is changed. It also has naturally some mechanical disadvantages of the loader. Such as articulated frames, which are very prone to failure due to the context of the loader application, and which are steered with large turning radii, stable bottoms, and which are prone to rollover during high speed operation.
Disclosure of Invention
The invention aims to provide a hydraulic four-wheel active steering system of an excavating loader, a working method and application.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the hydraulic four-wheel active steering system of the backhoe loader comprises a steering wheel, wherein the steering wheel is connected with a steering gear, the steering gear is connected with a gear pump through a priority valve, an A port of the steering gear is connected with an electromagnetic valve A, and a B port of the steering gear is connected with an electromagnetic valve B; the electromagnetic valve A and the electromagnetic valve B are connected with a synchronous valve, the synchronous valve is respectively connected with a front axle steering oil cylinder and a rear axle steering oil cylinder, and the front axle steering oil cylinder and the rear axle steering oil cylinder are both arranged on a driving steering axle and respectively control tires of front wheels and rear wheels.
The steering wheel comprises a steering wheel at the excavator end and a steering wheel at the loader end; the diverter comprises a diverter at the excavator end and a diverter at the loader end.
The steering gear is a load-sensitive full-hydraulic steering gear.
The electromagnetic valve A and the electromagnetic valve B are two-position six-way electromagnetic valves, and when the two electromagnetic valves are closed at the same time, the steering wheel and the steering gear at the excavator end act; when both solenoid valves are simultaneously open, the steering wheel and diverter at the loader end are active.
The working method of the hydraulic four-wheel active steering system of the backhoe loader comprises the following steps:
when the vehicle turns left in running, the steering wheel rotates the steering wheel through the connecting mechanism, the LS port of the steering wheel sends a signal to the priority valve 5, at the moment, the engine drives the gear pump to pump high-pressure hydraulic oil to enter the steering wheel 2 through the priority valve, along with the rotation of the steering wheel, the hydraulic oil flows out of the A port of the steering wheel and enters the two-position six-way electromagnetic valve A, flows out of the B port of the steering wheel and enters the two-position six-way electromagnetic valve B, and enters the synchronous valve after coming out of the two-position six-way electromagnetic valve, and enters the left cylinder of the front axle steering cylinder and the left cylinder of the rear axle steering cylinder through the synchronous valve, and the two steering cylinders respectively pull the tires on the driving steering axle to finish steering; when steering to the right, the actions are reversed. The synchronous valve enables oil liquid entering the front and rear steering cylinders to synchronously act, and the steering angle inconsistency of the front and rear axles caused by inconsistent resistance is prevented, so that the dragging phenomenon of the front and rear axles is avoided.
The invention relates to an excavating loader adopting a hydraulic four-wheel active steering system, which comprises a frame assembly, a hydraulic four-wheel active steering system power system, a cab assembly, an excavating mechanism assembly, a loading mechanism assembly, an operating mechanism assembly and an electric system, wherein the hydraulic four-wheel active steering system power system comprises a driving steering system and a hydraulic system; the driving steering system, the power system, the hydraulic system, the operating mechanism assembly and the electric system are all arranged on the frame assembly and are powered by the power system.
The frame assembly comprises an integral frame, and the integral frame is formed by welding a large arm installation seat of the excavator, a frame side plate, a cab installation seat, a front axle fixing seat, a large arm support of the loader, a support supporting plate, an engine supporting plate, a radiator supporting plate, a swinging support and a large arm rotary cylinder supporting plate of the excavator.
Wherein, the front axle passes through the bolt to be installed above the frame assembly, and the rear axle passes through the articulated frame to be installed on the frame assembly.
The excavating mechanism assembly comprises an oil cylinder middle-mounted system.
Further, the oil cylinder middle-set system comprises a large arm oil cylinder, one end of the large arm oil cylinder is connected to the inside of the center of a large arm of the excavator through a pin shaft, the other end of the large arm oil cylinder is connected to the frame assembly, and the large arm of the excavator is fixed to the frame assembly.
Compared with the prior art, the invention has the outstanding effects that:
compared with the hinged steering system of the traditional loader, the hydraulic four-wheel active steering system has better stability and smaller turning radius, and can not generate abrasion of the hinged part of the loader, so that the service life is longer. Compared with the traditional tractor type two-head busy, the system is four-wheel steering and four-wheel driving, has stronger driving force in severe environments or muddy environments, and has far better climbing capacity and traversing capacity than the traditional tractor type two-head busy.
The rear axle of the backhoe loader is arranged on the frame assembly through the hinged frame, can swing by a maximum angle of 10 degrees, and ensures that 4 tires can be attached to the ground no matter what road surface, thereby realizing the maximization of driving force.
The integral frame of the backhoe loader has the advantages of good stability, strong bearing capacity and small turning radius, and can prolong the service life of the multifunctional engineering vehicle, thereby improving the overall cost performance of the vehicle.
Compared with the traditional split type vehicle body with busy two ends of a loader, the integral type vehicle frame is superior to the split type vehicle body in terms of firmness and durability; compared with the tractor type double busy, the tractor type double busy enlarges the tyre of the rear wheel, so that the forward and backward force is unevenly distributed, and the stability is far inferior to that of the integral frame of the excavating loader.
The hydraulic four-wheel active steering system of the backhoe loader, and the working method and application of the hydraulic four-wheel active steering system of the backhoe loader are further described below with reference to the accompanying drawings and the specific embodiments.
Drawings
FIG. 1 is a schematic illustration of a hydraulic four-wheel active steering system of an backhoe loader of the present invention;
FIG. 2 is another schematic illustration of the hydraulic four-wheel active steering system of the backhoe loader of the present invention;
FIG. 3 is a hydraulic schematic diagram of the hydraulic four-wheel active steering system of the backhoe loader of the present invention;
FIG. 4 is a front view of the backhoe loader;
FIG. 5 is a top view of the backhoe loader;
FIG. 6 is a rear view of the backhoe loader;
FIG. 7 is a right side view of the backhoe loader;
FIG. 8 is a left side view of the backhoe loader;
FIG. 9 is a bottom view of the backhoe loader;
FIG. 10 is a perspective view of the backhoe loader;
FIG. 11 is a front view of the integral frame of the backhoe loader;
FIG. 12 is a top view of the integral frame of the backhoe loader;
FIG. 13 is a cross-sectional view of a large arm;
FIG. 14 is a front view of the cab assembly;
FIG. 15 is a left side view of the cab assembly;
FIG. 16 is a cross-sectional view of the cab assembly.
The device comprises a 1-steering wheel, a 2-steering device, a 3-gear pump, a 4-hydraulic torque converter, a 5-priority valve, a 6-synchronous valve, a 7-electromagnetic valve A, an 8-electromagnetic valve B, a 9-tire, a 10-driving steering axle, a 11-front axle steering oil cylinder and a 12-engine, wherein the steering wheel is a steering wheel;
100-frame assembly, 200-driving steering system, 300-power system, 400-cab assembly, 500-excavating mechanism assembly, 600-loading mechanism assembly, 700-hydraulic system, 800-steering mechanism assembly, 900-electric system;
101-a large arm mounting seat of a digging machine, 102-a side plate of a frame, 103-a cab mounting seat, 104-a front axle fixing seat, 105-a large arm bracket of a loading machine, 106-a bracket supporting plate, 107-an engine supporting plate, 108-a radiator supporting plate, 109-a swinging bracket, 110-a large arm rotary cylinder supporting plate of the digging machine and 110-a supporting leg bracket;
401-frame, 402-meter assembly, 404-seat, 405-multiway valve mounting box;
501-a large arm of the excavator, 502-a pin shaft and 503-a large arm oil cylinder.
Detailed Description
Example 1
1-2, a hydraulic four-wheel active steering system of an excavating loader comprises a steering wheel 1, wherein the steering wheel 1 is connected with a steering gear 2, the steering gear 2 is connected with a gear pump 3 through a priority valve 5, an A port of the steering gear 2 is connected with an electromagnetic valve A7, and a B port of the steering gear 2 is connected with an electromagnetic valve B8; the electromagnetic valve A7 and the electromagnetic valve B8 are connected with the synchronous valve 6, the synchronous valve 6 is respectively connected with a front axle steering cylinder 11 and a rear axle steering cylinder, the front axle steering cylinder 11 is arranged on a driving steering axle 10 of a front wheel, the rear axle steering cylinder is arranged on a driving steering axle of a rear wheel, and the two wheels respectively control a tire 9 of the front wheel and a tire of the rear wheel.
The steering wheel 1 comprises a steering wheel at the excavator end and a steering wheel at the loader end; the diverter 2 includes a diverter at the excavator end and a diverter at the loader end.
The steering gear 2 is a load-sensitive full hydraulic steering gear.
The electromagnetic valves A7 and B8 are two-position six-way electromagnetic valves, and when the two electromagnetic valves are closed at the same time, the steering wheel and the steering gear at the excavator end act; when both solenoid valves are simultaneously open, the steering wheel and diverter at the loader end are active.
Referring to fig. 1-3, the working method of the hydraulic four-wheel active steering system of the backhoe loader is as follows:
when the vehicle turns left in running, the steering wheel 1 rotates left, the steering wheel 1 rotates the steering gear 2 through the connecting mechanism, the LS port of the steering gear 2 sends a signal to the priority valve 5, at the moment, the engine 12 drives the gear pump 3 to pump high-pressure hydraulic oil to enter the steering gear 2 through the priority valve 5, along with the rotation of the steering wheel 1, the hydraulic oil flows out of the A port of the steering gear 2 into the two-position six-way electromagnetic valve A7, flows out of the B port of the steering gear 2 into the two-position six-way electromagnetic valve B8, and enters the synchronous valve 6 after coming out of the two-position six-way electromagnetic valves, enters the left cylinder of the front axle steering cylinder 11 and the left cylinder of the rear axle steering cylinder through the synchronous valve 6, and the two steering cylinders respectively pull the tires on the driving steering axle to finish steering actions; when steering to the right, the actions are reversed.
Example 2
As shown in fig. 1-2 and 4-10, an excavating loader employing the hydraulic four-wheel active steering system of embodiment 1, specifically comprising a frame assembly 100, a hydraulic four-wheel active steering system, a power system 300, a cab assembly 400, an excavating mechanism assembly 500, a loading mechanism assembly 600, an operating mechanism assembly 800, and an electrical system 900, wherein the hydraulic four-wheel active steering system comprises a driving steering system 200 and a hydraulic system 700; the drive steering system 200, the power system 300, the hydraulic system 700, the steering mechanism assembly 800 and the electrical system 900 are all arranged on the frame assembly 100, and power is provided by the power system 300.
The main body component of the frame assembly 100 is a unitary frame. The powertrain 300 basically includes an engine 12, a torque converter 4 and a drive shaft. The cab assembly 400 mainly includes a cab and a seat. The digging mechanism assembly 500 mainly comprises a large arm of the excavator, a bucket rod, a bucket and a connecting rod welded together. The loader assembly 600 generally includes a loader arm, forearm, drawbar, bucket. The steering mechanism assembly 800 basically includes a steering wheel, a brake and a throttle. The electrical system 900 mainly comprises a wire harness, a storage battery, an illuminating lamp, an instrument, a loudspeaker and a reversing buzzer.
The pump, valve and pipeline as steering function in the hydraulic four-wheel active steering system belong to the hydraulic system 700, and the steering cylinder and the driving steering axle as executing mechanisms belong to the driving steering system 200. Steering wheels in a hydraulic four-wheel active steering system also belong to a component in the loader assembly 600.
The backhoe loader is powered by the engine of the Weichai 4105, converted by the torque converter 4, connected to the drive steering system 200 by a transmission shaft, and driven by the drive steering system 200 to generate a forward and backward walking moment by driving the tires.
When the steering wheel is turned, the steering gear 2 drives the front axle steering cylinder 11 of the driving steering system 200 to control the steering of the tires 9, and simultaneously controls the tires of the rear axle to rotate in the opposite directions along with the front axle tires through the synchronous valve 6, and the steering is performed according to a certain proportion according to the steering angle of the front wheels.
As shown in fig. 11 to 12, the frame assembly 100 is formed by welding a large arm support 101, a frame side plate 102, a cab support 103, a front axle fixing base 104, a large arm support 105, a support bracket 106, an engine bracket 107, a radiator support 108, a swing bracket 109, a large arm rotary cylinder support 110 and a support leg support 111.
The excavator boom mounting base 101 is used for mounting the excavator boom. The cab mount 103 is used to mount the cab. The loader arm support 105 is used to attach the loader arm. The bracket supporting plate 106 is welded below the loader big arm bracket 105 and supports the loader big arm bracket 105 for connection and reinforcement. The swing bracket 109 is used for fixing the swing welding, and the rear axle is installed and fixed on the swing welding. Through rocking seam, can the side-to-side in the certain angle prevent 4 wheels on a plane, have the tire unsettled when crossing the pothole highway section.
The front axle is mounted on the frame assembly 100 by bolts, and the rear axle is mounted on the frame assembly 100 by a hinge bracket.
The integral frame has good stability, strong bearing capacity and small turning radius, and can prolong the service life of the multifunctional engineering vehicle, thereby improving the overall cost performance of the vehicle.
As shown in fig. 13, the excavation mechanism assembly 500 includes a ram centering system. The oil cylinder middle-set system comprises a large arm oil cylinder 503, one end of the large arm oil cylinder 503 is connected to the inside of the center of a large arm 501 of the excavator through a pin shaft 502, the other end of the large arm oil cylinder 503 is connected to the frame assembly 100, and the large arm 501 of the excavator is fixed to the frame assembly 100.
When the stroke of the large arm oil cylinder is reduced, the large arm is gradually lifted and finally vertical to the frame, when the stroke of the large arm oil cylinder is prolonged, the large arm gradually falls down and rotates downwards, and when the stroke reaches the maximum, the maximum digging depth is reached.
As shown in fig. 14-16, the frame 401 of the cab adopts a high-strength special pipe for a forklift overhead guard, and the welded frame 401 forms a whole, so that the strength is better, the frame is not easy to deform when the vehicle rolls over, and the life safety of a driver is protected. Two sets of steering wheels 1 and instrument assemblies 402 are arranged in a cab, so that a driver can drive the vehicle in two directions, a seat 404 arranged in the middle is a rotatable seat, and the seat can be conveniently rotated by pulling a handle below the seat, thereby achieving the purpose of driving the vehicle in two directions. As can be seen in connection with fig. 15, the digging end of the cab, the tempered glass, up to the floor of the cab, maximizes the field of view when the digging mechanism is operated, and the work of the bucket is seen while sitting inside the cab. And the grid is arranged above the cab, so that the strength of the cab when the cab is tipped over is enhanced, and high-altitude falling objects can be effectively prevented. This is not possible with the existing busy ends. A multiple valve mounting box 405 is mounted beside the seat 404 for mounting the valves.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The working method of the hydraulic four-wheel active steering system of the backhoe loader is characterized by comprising the following steps of: the hydraulic four-wheel active steering system of the backhoe loader comprises a steering wheel (1), wherein the steering wheel (1) is connected with a steering gear (2), the steering gear (2) is connected with a gear pump (3) through a priority valve (5), and the steering wheel (1) comprises a steering wheel at the end of the backhoe and a steering wheel at the end of the loader; the steering gear (2) comprises a steering gear at the excavator end and a steering gear at the loader end; wherein the port A of one steering gear is connected with the port A of the electromagnetic valve A (7), the port B is connected with the port C of the electromagnetic valve B (8), the port P is connected with the port A of the electromagnetic valve B (8), and the port Ls is connected with the port C of the electromagnetic valve A (7); the port A of the other steering gear is connected with the port D of the electromagnetic valve B (8), the port B is connected with the port B of the electromagnetic valve A (7), the port P is connected with the port B of the electromagnetic valve B (8), and the port Ls is connected with the port D of the electromagnetic valve A (7); the P1 port of the electromagnetic valve A (7) is connected with the steering oil cylinder, and the P2 port of the electromagnetic valve A (7) is connected with the LS port of the priority valve (5); the P2 port of the electromagnetic valve B (8) is connected with the synchronous valve (6), and the P1 port of the electromagnetic valve B (8) is connected with the EF port of the priority valve (5); the synchronous valve (6) is respectively connected with a front axle steering oil cylinder (11) and a rear axle steering oil cylinder, and the front axle steering oil cylinder (11) and the rear axle steering oil cylinder are both arranged on a driving steering axle and respectively control tires of front wheels and rear wheels; the electromagnetic valve A (7) and the electromagnetic valve B (8) are two-position six-way electromagnetic valves, and when the two electromagnetic valves are closed at the same time, a steering wheel and a steering gear at the excavator end act; when the two electromagnetic valves are disconnected at the same time, the steering wheel and the steering gear at the loader end act;
when the vehicle turns left in running, the steering wheel (1) rotates left, the steering wheel (1) rotates the steering gear (2) through the connecting mechanism, an LS port of the steering gear (2) sends a signal to the priority valve (5), at the moment, the engine (12) drives the gear pump (3) to pump high-pressure hydraulic oil to enter the steering gear (2) through the priority valve (5), along with the rotation of the steering wheel (1), the hydraulic oil flows out of an A port of the steering gear (2) to enter a two-position six-way electromagnetic valve A, flows out of a B port of the steering gear (2) to enter a two-position six-way electromagnetic valve B, flows out of the two-position six-way electromagnetic valves to enter the synchronous valve (6), enters a left cylinder of the front axle steering cylinder (11) and a left cylinder of the rear axle steering cylinder through the synchronous valve (6), and the two steering cylinders respectively pull tires on the driving steering axle to finish steering actions; when steering to the right, the actions are reversed.
2. The method of operating a hydraulic four-wheel active steering system for an excavating loader according to claim 1 wherein: the steering gear (2) is a load-sensitive full-hydraulic steering gear.
3. An excavating loader adopting a hydraulic four-wheel active steering system, which is characterized in that: the hydraulic four-wheel active steering system comprises a driving steering system (200) and a hydraulic system (700); the driving steering system (200), the power system (300), the hydraulic system (700), the operating mechanism assembly (800) and the electric system (900) are all arranged on the frame assembly (100), and power is provided by the power system (300);
the hydraulic four-wheel active steering system of the backhoe loader comprises a steering wheel (1), wherein the steering wheel (1) is connected with a steering gear (2), the steering gear (2) is connected with a gear pump (3) through a priority valve (5), and the steering wheel (1) comprises a steering wheel at the backhoe end and a steering wheel at the loader end; the steering gear (2) comprises a steering gear at the excavator end and a steering gear at the loader end; wherein the port A of one steering gear is connected with the port A of the electromagnetic valve A (7), the port B is connected with the port C of the electromagnetic valve B (8), the port P is connected with the port A of the electromagnetic valve B (8), and the port Ls is connected with the port C of the electromagnetic valve A (7); the port A of the other steering gear is connected with the port D of the electromagnetic valve B (8), the port B is connected with the port B of the electromagnetic valve A (7), the port P is connected with the port B of the electromagnetic valve B (8), and the port Ls is connected with the port D of the electromagnetic valve A (7); the P1 port of the electromagnetic valve A (7) is connected with the steering oil cylinder, and the P2 port of the electromagnetic valve A (7) is connected with the LS port of the priority valve (5); the P2 port of the electromagnetic valve B (8) is connected with the synchronous valve (6), and the P1 port of the electromagnetic valve B (8) is connected with the EF port of the priority valve (5); the synchronous valve (6) is respectively connected with a front axle steering oil cylinder (11) and a rear axle steering oil cylinder, and the front axle steering oil cylinder (11) and the rear axle steering oil cylinder are both arranged on a driving steering axle and respectively control tires of front wheels and rear wheels; the electromagnetic valve A (7) and the electromagnetic valve B (8) are two-position six-way electromagnetic valves, and when the two electromagnetic valves are closed at the same time, a steering wheel and a steering gear at the excavator end act; when the two electromagnetic valves are disconnected at the same time, the steering wheel and the steering gear at the loader end act;
the frame assembly (100) comprises an integral frame, and is formed by welding a large arm mounting seat (101), a frame side plate (102), a cab mounting seat (103), a front axle fixing seat (104), a large arm support (105) of a loader, a support plate (106), an engine support plate (107), a radiator support plate (108), a swinging support (109), a large arm rotary cylinder support plate (110) of the excavator and a support leg support (111); the excavating mechanism assembly (500) includes a cylinder center system.
4. A backhoe loader according to claim 3, wherein: the steering gear (2) is a load-sensitive full-hydraulic steering gear.
5. A backhoe loader according to claim 3, wherein: the front axle is arranged on the frame assembly (100) through bolts, and the rear axle is arranged on the frame assembly (100) through a hinge frame.
6. A backhoe loader according to claim 3, wherein: the oil cylinder middle-set system comprises a large arm oil cylinder (503), one end of the large arm oil cylinder (503) is connected to the inside of the center of a large arm (501) of the excavator through a pin shaft (502), the other end of the large arm is connected to a frame assembly (100), and the large arm (501) of the excavator is fixed to the frame assembly (100).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011209510.1A CN112249155B (en) | 2020-11-03 | 2020-11-03 | Hydraulic four-wheel active steering system of backhoe loader, working method and application |
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| CN202011209510.1A CN112249155B (en) | 2020-11-03 | 2020-11-03 | Hydraulic four-wheel active steering system of backhoe loader, working method and application |
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| CN112249155B true CN112249155B (en) | 2023-10-31 |
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| CN211037104U (en) * | 2019-09-23 | 2020-07-17 | 山东博峻智能科技有限公司 | Double-end busy excavator |
| CN211472676U (en) * | 2019-12-26 | 2020-09-11 | 三一重机有限公司 | Excavator direction control system and excavator |
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| JP4928087B2 (en) * | 2005-03-14 | 2012-05-09 | ヤンマー株式会社 | Work vehicle frame structure |
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| CN112249155A (en) | 2021-01-22 |
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