CN215887830U - Crabbing system for double-steel-wheel road roller - Google Patents

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a crab walking system for a double-drum road roller, which comprises a crab walking connecting assembly, wherein one end of the crab walking connecting assembly is connected with a front frame, and the other end of the crab walking connecting assembly is connected with a rear frame; the hydraulic control assembly is used for controlling the crab motion connecting assembly to enable the front frame and the rear frame to be in a crab motion state or a neutral state; the vehicle control unit is electrically connected with the hydraulic control assembly and is used for controlling the hydraulic control assembly; and the obstacle detector is in communication connection with the vehicle control unit and is used for detecting the environment around the vehicle control unit and feeding back signals to the vehicle control unit. The utility model can monitor the working environment of the road roller while ensuring the effective work of the road roller, so as to ensure the working safety of the road roller.

Description

Crabbing system for double-steel-wheel road roller

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a crabbing system for a double-drum road roller.

Background

A double-steel-wheel road roller is an asphalt pavement construction device and is mainly used for repeatedly rolling a newly paved asphalt pavement. In the construction process of the double-steel-wheel road roller, when the double-steel-wheel road roller is used for performing curve or curb compaction operation, the front steel wheel and the rear steel wheel need to be transversely offset and staggered for rolling, so that when the double-steel-wheel road roller is easier to approach and keep away from a curb, the condition that the road surface is not pressed or the whole machine is interfered with the curb is avoided, the construction quality is improved, and the action of staggering the left and right directions of the front steel wheel and the rear steel wheel is called crab walking.

When the double-steel-wheel road roller crabbing moves, the double-steel-wheel road roller generally acts through a steering oil cylinder arranged on a front frame, a rear frame and a hinge device. In the working process of the road roller, obstacles near the whole roller are not monitored, so that potential safety hazards exist, and even casualties can be caused.

Therefore, a crabbing system for a dual drum roller is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a crabbing system for a double-drum road roller, which can monitor the working environment of the road roller while ensuring the effective work of the road roller so as to ensure the working safety of the road roller.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a crabbing system for a dual drum roller, comprising:

one end of the crab line connecting assembly is connected with the front frame, and the other end of the crab line connecting assembly is connected with the rear frame;

the hydraulic control assembly is used for controlling the crab motion connecting assembly to enable the front frame and the rear frame to be in a crab motion state or a neutral state;

the vehicle control unit is electrically connected with the hydraulic control assembly and is used for controlling the hydraulic control assembly;

and the obstacle detector is in communication connection with the vehicle control unit and is used for detecting the environment around the vehicle control unit and feeding back signals to the vehicle control unit.

Furthermore, the crab motion connecting assembly comprises a front hinge frame, a middle hinge frame, a rear hinge frame, a steering control assembly and a crab motion control assembly, wherein one end of the front hinge frame is connected with the front frame, and the other end of the front hinge frame is hinged with the middle hinge frame; the crab walking control assembly is respectively connected with the middle hinged frame and the front hinged frame and is used for driving the front hinged frame to rotate relative to the middle hinged frame so as to realize crab walking movement.

Further, the steering control assembly includes: the hydraulic control assembly is used for controlling the first steering oil cylinder and the second steering oil cylinder.

Furthermore, the crab-walking control assembly comprises a first crab-walking oil cylinder and a second crab-walking oil cylinder, the first crab-walking oil cylinder and the second crab-walking oil cylinder are positioned on two sides of the middle hinged frame and are connected with the middle hinged frame and the front frame, and the hydraulic control assembly is used for controlling the first crab-walking oil cylinder and the second crab-walking oil cylinder.

Furthermore, a rotary supporting piece is arranged between the rear hinged frame and the rear frame, and the rotary supporting piece is connected with the rear hinged frame and the rear frame in a floating mode.

Further, crab line coupling assembling still includes turns to angle sensor, crab line angle sensor and meso position return sensor, turn to angle sensor, crab line angle sensor and meso position return sensor all with vehicle control unit electricity is connected.

Furthermore, the hydraulic control assembly comprises an oil supply assembly, a first reversing control valve, a steering hydraulic control assembly and a crab hydraulic control assembly, an oil outlet of the oil supply assembly is communicated with an oil inlet of the first reversing control valve, the steering hydraulic control assembly is communicated with a first control port of the first reversing control valve and is communicated with the first steering oil cylinder and the second steering oil cylinder, the crab hydraulic control assembly is communicated with a second control port of the first reversing control valve and is communicated with the first crab oil cylinder and the second crab oil cylinder, and the whole vehicle controller is electrically connected with the first reversing control valve, the steering hydraulic control assembly and the crab hydraulic control assembly.

Further, the steering hydraulic control assembly comprises a steering gear, the steering gear is communicated with the first steering oil cylinder and the second steering oil cylinder respectively, the steering gear is electrically connected with the whole vehicle controller, and the steering gear can control the first steering oil cylinder to extend out and the second steering oil cylinder to retract, or the first steering oil cylinder to retract and the second steering oil cylinder to extend out.

Further, the crab hydraulic control assembly comprises a second reversing control valve, a first balance valve and a second balance valve, the second reversing control valve is electrically connected with the whole vehicle controller, an oil inlet of the second reversing control valve is communicated with a second control port of the first reversing control valve, an oil inlet of the first balance valve is respectively communicated with a first control port of the second reversing control valve and a control port of the second balance valve, an oil outlet of the first balance valve is communicated with the rodless cavity of the first crab oil cylinder, an oil inlet of the second balance valve is respectively communicated with a second control port of the second reversing control valve and a control port of the first balance valve, an oil outlet of the second balance valve is communicated with the rodless cavity of the second crab oil cylinder, the rodless cavity of the first crab oil cylinder is communicated with the rod cavity of the second crab oil cylinder, the rodless cavity of the second crab oil cylinder is communicated with the rod cavity of the first crab oil cylinder, and the second reversing control valve can control the piston rod of the first crab oil cylinder to extend and the piston rod of the second crab oil cylinder to retract, or the piston rod of the second crab oil cylinder to retract and the piston rod of the first crab oil cylinder to extend.

Furthermore, the crab hydraulic control assembly further comprises a first check valve and a second check valve, an oil inlet of the first check valve is communicated with an oil inlet of the first balance valve, an oil outlet of the first check valve is communicated with an oil outlet of the first balance valve and a pilot oil port of the first balance valve respectively, an oil inlet of the second check valve is communicated with an oil inlet of the second balance valve, and an oil outlet of the second check valve is communicated with an oil outlet of the second balance valve and a pilot oil port of the second balance valve respectively.

The utility model has the beneficial effects that:

the crab walking system for the double-steel-wheel road roller provided by the utility model has the advantages that the front frame provided with the front steel wheels is connected with the rear frame provided with the rear steel wheels through the crab walking connecting assembly, and the hydraulic control assembly can control the front frame and the rear frame to be in a crab walking state or a middle position state, so that when the road surface is pressed, the front frame and the rear frame can work in the middle position state or can be compacted on the road side and work in the crab walking state, and the compaction quality of the road surface is ensured; the obstacle detector connected with the vehicle control unit in a communication mode is used for monitoring the environment around the vehicle control unit and feeding signals back to the vehicle control unit, the vehicle control unit can brake the road roller or remind a driver as required, and therefore when the road roller is guaranteed to work effectively, the working environment around the road roller can be monitored, and the working safety of the road roller is guaranteed.

Drawings

FIG. 1 is a schematic view of a crab walking system for a dual drum roller of the present invention;

FIG. 2 is a schematic view of a crab joint assembly in a crab system for a dual drum roller according to the present invention;

FIG. 3 is a schematic diagram of a hydraulic control assembly in a crab-walking system for a dual drum roller according to the present invention;

FIG. 4 is a schematic view of the crab-walking system for a dual drum roller of the present invention in a neutral position;

FIG. 5 is a schematic view of a crab walking system for a dual drum roller according to the present invention in a steering state;

FIG. 6 is a schematic view of the crabbing system for a dual drum roller of the present invention in a crabbing state.

In the figure:

1. a crab connecting assembly; 11. a front hinge frame; 111. a steering angle sensor; 12. a middle hinged frame; 121. a middle position sensing element; 13. a rear hinge frame; 131. a slewing support; 14. a first steering cylinder; 15. a second steering cylinder; 16. a first crab oil cylinder; 17. a second crab oil cylinder; 18. a neutral return sensor; 19. a crab-walk angle sensor; 2. a front frame; 21. a front steel wheel; 3. a rear frame; 31. a rear steel wheel; 4. a hydraulic control assembly; 41. a steering hydraulic control assembly; 411. a diverter; 42. a crab hydraulic control assembly; 421. a second directional control valve; 422. a first counter-balance valve; 423. a second balancing valve; 42. a first check valve; 425. a second one-way valve; 43. an oil supply assembly; 431. an oil tank; 432. a hydraulic pump; 44. a first directional control valve.

Detailed Description

The technical scheme of the utility model is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The road roller is an indispensable engineering machine in urban road construction, and the performance of the road roller directly determines the road compaction degree. In addition, accidents need to be avoided in the road construction process, and the existing road roller cannot monitor the surrounding environment in the tooling process, so that the risk of safety accidents exists. In order to solve the problem, the working environment around the road roller can be monitored while the road roller is ensured to work effectively, so as to ensure the working safety of the road roller, as shown in fig. 1-6, the utility model provides a crabbing system for a double-drum road roller. This crabbing system for double steel wheel road roller includes: crab line coupling assembling 1, hydraulic control subassembly 4, vehicle control unit and obstacle detector.

Wherein, one end of the crab line connecting component 1 is connected with the fixed front frame 2, and the other end is fixedly connected with the rear frame 3; the hydraulic control assembly 4 is used for controlling the crab line connecting assembly 1 to enable the front frame 2 and the rear frame 3 to be in a crab line state or a neutral state; the whole vehicle controller is electrically connected with the hydraulic control assembly 4 and is used for controlling the hydraulic control assembly 4 to enable the front frame 2 and the rear frame 3 to move according to a middle position state or a crab state; the obstacle detector is in communication connection with the vehicle control unit and used for detecting the environment around the vehicle control unit and feeding back signals to the vehicle control unit.

Specifically, in this embodiment, when the crabbing operation is performed, the vehicle controller monitors the distance between the vehicle and a nearby obstacle through the millimeter wave radar, and controls the vehicle and the curb obstacle to be located beyond a safe distance, and when the distance is smaller than the safe distance, the millimeter wave radar feeds back a signal to the vehicle controller, and the vehicle controller starts a service braking system to force the two-wheeled road roller to actively brake, so as to prevent the vehicle from colliding with nearby people or obstacles or feeding back the signal to a driver through an alarm system, thereby avoiding a safety accident.

The front frame 2 and the rear frame 3 can be controlled to be in a crab running state or a middle position state through the hydraulic control assembly 4, so that when the pavement is compacted, the pavement can be worked by the middle position state or the crab running state, and the compaction quality of the pavement is ensured; the obstacle detector connected with the vehicle control unit in a communication mode is used for monitoring the environment around the vehicle control unit and feeding signals back to the vehicle control unit, the vehicle control unit can brake the road roller or remind a driver as required, and therefore when the road roller is guaranteed to work effectively, the environment around the work of the road roller can be monitored, and the safety of the work of the road roller is guaranteed.

Further, the crab joint assembly 1 comprises a front hinge frame 11, a middle hinge frame 12, a rear hinge frame 13, a steering control assembly and a crab control assembly, wherein one end of the front hinge frame 11 is connected with the front frame 2, and the other end of the front hinge frame is hinged with the middle hinge frame 12; rear hinged frame 13 one end is connected with back frame 3, and the other end is articulated with the one end that preceding hinged frame 11 was kept away from to middle hinged frame 12, and the steering control subassembly is connected with preceding hinged frame 11 and rear hinged frame 13 respectively, can drive preceding hinged frame 11 and rotate relative middle hinged frame 12, and crab is gone the control subassembly and is connected with middle hinged frame 12 and preceding hinged frame 11 respectively for the relative middle hinged frame 12 of preceding hinged frame 11 of drive rotates in order to realize crab's bank of china. Through the arrangement, the steering control assembly is controlled to flexibly realize steering of the road roller, and after the steering angle of the road roller is adjusted, the angle of the front frame 2 is adjusted through the crab walking control assembly, so that the front frame 2 and the rear frame 3 are in a crab walking state, the requirement for compacting the edge of a road can be met, and the quality of the compacted road surface is improved.

Specifically, the steering control assembly includes: the hydraulic control assembly 4 is used for controlling the first steering oil cylinder 14 and the second steering oil cylinder 15. Specifically, a piston rod of the first steering cylinder 14 and a piston rod of the second steering cylinder 15 are both hinged to the front hinge bracket 11, and a body of the first steering cylinder 14 and a body of the second steering cylinder 15 are both hinged to the rear hinge bracket 13. The piston rod of the first steering oil cylinder 14 or the piston rod of the second steering oil cylinder 15 is controlled to extend, so that the front articulated frame 11 is driven to rotate, and clockwise steering or anticlockwise steering is realized.

Further, the crab-walking control assembly comprises a first crab-walking oil cylinder 16 and a second crab-walking oil cylinder 17, the first crab-walking oil cylinder 16 and the second crab-walking oil cylinder 17 are positioned on two sides of the middle hinged frame 12 and are connected with the middle hinged frame 12 and the front frame 2, and the hydraulic control assembly 4 is used for controlling the first crab-walking oil cylinder 16 and the second crab-walking oil cylinder 17. The first crab oil cylinder 16 or the second crab oil cylinder 17 is controlled to extend by controlling the hydraulic control assembly 4, so that the front articulated frame 11 reaching a set steering angle is adjusted, the front articulated frame 11 and the rear articulated frame 13 are in a parallel state, and crab motion is realized.

Further, a rotary supporting member 131 is arranged between the rear hinge frame 13 and the rear frame 3, and the rotary supporting member 131 is connected with the rear hinge frame 13 and the rear frame 3 in a floating manner. In the process of compacting uneven road surface, the rear steel wheel 31 may shake in the up-down direction due to the jolt of the road surface, and by providing the floating connection of the rotation support member 131 with the rear hinge frame 13 and the rear frame 3, the rear steel wheel 31 may have a certain amount of shake in the up-down direction to some extent. Therefore, rigid connection is effectively avoided, the rear steel wheel 31 is cushioned by uneven road surface to cause the whole road roller to incline to a certain degree, and even the road roller can not work effectively under extreme conditions. In other embodiments, a rotation support member 131 is arranged between the front hinge frame 11 and the front frame 2, and the rotation support member 131 is in floating connection with both the front hinge frame 11 and the front frame 2, so that the adaptability of the road roller to the road surface can be further improved, and flexible operation can be realized to a certain extent.

Further, the crab joint assembly 1 further comprises a steering angle sensor 111, a crab angle sensor 19 and a neutral position return sensor 18, and the steering angle sensor 111, the crab angle sensor 19 and the neutral position return sensor 18 are all electrically connected with the vehicle control unit. The steering deflection angle of the front frame 2 is monitored by the steering angle sensor 111, the crab running angle is monitored by the crab running angle sensor 19, and whether the front frame 2 and the rear frame 3 return to the middle position or not can be judged by the middle position return sensor 18 sensing the middle position sensing part 121, so that the steering, the crab running and the middle position of the road roller can be effectively monitored and controlled by the whole vehicle controller.

Specifically, the steering angle sensor 111 feeds back a steering angle signal, the crab angle sensor 19 feeds back a crab angle signal, the middle position sensor feeds back a middle position reset signal, the steering angle signal, the crab angle signal and the middle position reset signal are fed back to the whole vehicle controller, and according to the corresponding relation between the steering angle and the crab offset, the steering angle sensor is as follows: s is L · sin θ, where S is crab offset, and L is a distance between an axis of a hinge joint between the front hinge frame 11 and the middle hinge frame 12 and an axis of a hinge joint between the rear hinge frame 13 and the middle hinge frame 12; theta is a steering angle. The middle hinged frame 12 and the rear hinged frame 13 can limit the steering angle to be +/-19 degrees; the swing angle of the rear hinge bracket 13 is ± 20 °. The maximum crab walking amount S is calculated to be 460 multiplied by sin19 degrees to 150mm for the road roller model. In other embodiments, the maximum crab walking amount is different for different road roller models, and no limitation is made here.

Specifically, the vehicle control unit controls the whole machine to perform crab action, and acquires the actual accurate steering angle and crab angle obtained by the steering angle sensor 111 and the crab angle sensor 19, and when the steering angle and the crab angle are 0 degrees, the front and rear frames are confirmed to be parallel, and the whole machine is in a middle position state; when the steering angle and the crab running angle reach +/-19 degrees, the whole machine is in the state of the maximum crab running amount, crab running operation can be carried out, the crab running offset of the front steel wheel 31 and the rear steel wheel 31 is calculated according to the actual steering angle and the crab running angle, and offset information is displayed on a control table screen of the road roller, so that an operator can conveniently confirm whether the maximum crab running distance is reached to be 150 mm.

As shown in fig. 5, the vehicle control unit receives a set crab offset in advance, and calculates a steering angle corresponding to the set crab offset according to the set crab offset; and controlling the wheels to stop the steering operation when the difference value of the actual steering angle and the steering angle corresponding to the set crab-running offset is within a specified range. And when the difference value between the actual crab offset and the set crab offset is within a specified range, the whole vehicle controller controls the whole vehicle to stop steering operation.

As shown in fig. 6, in this manner, the actual crab offset of the wheel may be determined according to the actual steering angle, and the actual crab offset is prompted to the operator, and the operator determines whether the actual crab offset meets the construction requirement according to the actual road condition, and if so, the steering stopping function is triggered, otherwise, the next actual crab offset is continuously waited, and the steering angle and the crab angle are adjusted again. In this way, when the vehicle control unit receives the steering stop instruction triggered by the operator, the wheels are controlled to stop steering operation.

As shown in fig. 4, when the crabbing function is not needed, the vehicle controller automatically controls the crabbing control assembly and the steering control assembly according to the current crabbing angle only by turning off the crabbing switch on the console on the road roller, and the crabbing control assembly and the steering control assembly are restored to the initial balance state, so that the front steel wheels 21 are automatically controlled to return to the neutral position, that is, when the angle fed back by the steering angle sensor 111 is 0 °, the road roller returns to the neutral position. Through setting up automatic centering function for the controllability of complete machine is better, can reduce the complexity of operation, reduces the requirement to the driver.

Further, the hydraulic control assembly 4 includes an oil supply assembly 43, a first reversing control valve 44, a steering hydraulic control assembly 41 and a crab hydraulic control assembly 42, an oil outlet of the oil supply assembly 43 is communicated with an oil inlet of the first reversing control valve 44, the steering hydraulic control assembly 41 is communicated with a first control port of the first reversing control valve 44 and is communicated with the first steering cylinder 14 and the second steering cylinder 15, the crab hydraulic control assembly 42 is communicated with a second control port of the first reversing control valve 44 and is communicated with the first crab cylinder 16 and the second crab cylinder 17, and the whole vehicle controller is electrically connected with the first reversing control valve 44, the steering hydraulic control assembly 41 and the crab hydraulic control assembly 42. In the present embodiment, the oil supply unit 43 includes an oil tank 431 for containing hydraulic oil and a hydraulic pump 432 communicated with the oil tank 431, and an oil outlet of the hydraulic pump 432 is communicated with an oil inlet of the first directional control valve 44. In order to facilitate the control of the hydraulic pump 432 to be electrically connected to the vehicle controller, the vehicle controller may control the hydraulic pump 432 to operate or stop operating. Also, in order to accurately adjust the flow rate of the hydraulic oil, in other embodiments, the hydraulic pump 432 may be a variable pump.

The oil inlet of the first reversing control valve 44 is controlled by the vehicle control unit to be communicated with the first control port of the first reversing control valve 44, so that hydraulic oil enters the steering hydraulic control assembly 41 to control the first steering oil cylinder 14 and the second steering oil cylinder 15 to act, and steering control of the road roller is realized. The oil inlet of the first reversing control valve 44 is controlled by the vehicle control unit to be communicated with the second control port of the first reversing control valve 44, so that hydraulic oil enters the crab hydraulic control assembly 42 to control the first crab oil cylinder 16 and the second crab oil cylinder 17 to move, and crab control of the road roller is realized.

Further, the steering hydraulic control assembly 41 comprises a steering gear 411, the steering gear 411 is respectively communicated with the first steering cylinder 14 and the second steering cylinder 15, the steering gear 411 is electrically connected with the vehicle control unit, and the steering gear 411 can control the first steering cylinder 14 to extend and the second steering cylinder 15 to retract simultaneously, or the first steering cylinder 14 to retract and the second steering cylinder 15 to extend simultaneously. Specifically, an oil inlet of the steering gear 411 is communicated with an oil outlet of the hydraulic pump 432, a first control port of the steering gear 411 is communicated with a rod cavity of the first steering cylinder 14, a second control port of the steering gear 411 is communicated with a rod cavity of the second steering cylinder 15, the rod cavity of the first steering cylinder 14 is communicated with a rodless cavity of the second steering cylinder 15, and the rodless cavity of the first steering cylinder 14 is communicated with the rod cavity of the second steering cylinder 15. By controlling the steering gear 411, the oil inlet of the steering gear is communicated with the first control port, and the second control port is communicated with the oil return port, so that the first steering oil cylinder 14 retracts to the second steering oil cylinder 15 and extends out; or the oil inlet of the steering gear is communicated with the second control port by controlling the steering gear 411, and the first and second control ports are communicated with the oil return port, so that the second steering oil cylinder 15 retracts into the first steering oil cylinder 14 and extends out. Through the arrangement, the road roller can be ensured to realize rapid steering. The diverter 411 used in this embodiment is an existing mature product and will not be described herein in detail with respect to its internal structure.

Further, the crab hydraulic control assembly 42 includes a second direction control valve 421, a first balance valve 422 and a second balance valve 423, the second direction control valve 421 is electrically connected with the vehicle control unit, an oil inlet of the second direction control valve 421 is communicated with a second control port of the first direction control valve 44, an oil inlet of the first balance valve 422 is respectively communicated with a first control port of the second direction control valve 421 and a control port of the second balance valve 423, an oil outlet of the first balance valve 422 is communicated with a rodless chamber of the first crab cylinder 16, an oil inlet of the second balance valve 423 is respectively communicated with a second control port of the second direction control valve 421 and a control port of the first balance valve 422, an oil outlet of the second balance valve 423 is communicated with a rodless chamber of the second crab cylinder 17, a rodless chamber of the first crab cylinder 16 is communicated with a rodless chamber of the second crab cylinder 17, a rodless chamber of the second crab cylinder 17 is communicated with a rodless chamber of the first crab cylinder 16, the second directional control valve 421 can control the piston rod of the first crab cylinder 16 to extend while the piston rod of the second crab cylinder 17 retracts, or the piston rod of the first crab cylinder 16 to extend while the piston rod of the second crab cylinder 17 retracts.

Specifically, by controlling the second reversing control valve 421, the oil inlet of the second reversing control valve 421 is communicated with the first control port, and the second control port is communicated with the oil return port, so that the piston rod of the first crab oil cylinder 16 extends and the piston rod of the second crab oil cylinder 17 retracts, or by controlling the second reversing control valve 421, the oil inlet of the second reversing control valve 421 is communicated with the second control port, and the first control port is communicated with the oil return port, so that the piston rod of the second crab oil cylinder 17 extends and the piston rod of the first crab oil cylinder 16 retracts. Because the oil inlet of the first balance valve 422 is communicated with the control port of the second balance valve 423, and the oil inlet of the second balance valve 423 is communicated with the control port of the first balance valve 422, when the crab running angle of the road roller rotates in place, the second reversing control valve 421 is in the middle position, and the middle position is in an H shape, at the moment, the first balance valve 422 and the second balance valve 423 are both completely closed to completely lock the first crab running oil cylinder 16 and the second crab running oil cylinder 17, and in the process of compacting the road surface, the crab running angle is ensured not to deviate, so that the smooth compaction work of the road surface is ensured.

Further, the crab hydraulic control assembly 42 further includes a first check valve 42 and a second check valve 425, an oil inlet of the first check valve 42 is communicated with an oil inlet of the first balance valve 422, an oil outlet of the first check valve 42 is respectively communicated with an oil outlet of the first balance valve 422 and a pilot oil port of the first balance valve 422, an oil inlet of the second check valve 425 is communicated with an oil inlet of the second balance valve 423, and an oil outlet of the second check valve 425 is respectively communicated with an oil outlet of the second balance valve 423 and a pilot oil port of the second balance valve 423. Specifically, the first balance valve 422 and the second balance valve 423 are both in a normally closed state, and by providing the first check valve 42 and the second check valve 425, when the first crab oil cylinder 16 extends, first, hydraulic oil enters the pilot oil port of the first balance valve 422 through the first check valve 42 to open the first balance valve 422, and at the same time, the second balance valve 423 is controlled to open through the control port of the second balance valve 423, hydraulic oil enters the rodless cavity of the first crab oil cylinder 16 to extend the piston rod of the first crab oil cylinder 16, and the second crab oil cylinder 17 performs oil return, and similarly, the control of the second crab oil cylinder 17 is the same as that in the above manner, and details are not described here. By arranging the first check valve 42 and the second check valve 425, the first balance valve 422 and the second balance valve 423 can be ensured to be opened slowly, impact caused by rapid flowing of hydraulic oil is reduced, and crab flexible control is realized.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a crabbing system for two steel-wheeled road roller which characterized in that includes:

the crab-walking connecting assembly (1), one end of the crab-walking connecting assembly (1) is connected with the front frame (2), and the other end of the crab-walking connecting assembly is connected with the rear frame (3);

the hydraulic control assembly (4) is used for controlling the crab motion connecting assembly (1) to enable the front frame (2) and the rear frame (3) to be in a crab motion state or a neutral state;

the vehicle control unit is electrically connected with the hydraulic control assembly (4) and is used for controlling the hydraulic control assembly (4);

and the obstacle detector is in communication connection with the vehicle control unit and is used for detecting the environment around the vehicle control unit and feeding back signals to the vehicle control unit.

2. The crabbing system for the double-drum roller according to claim 1, wherein the crabbing connection assembly (1) comprises a front articulated frame (11), a middle articulated frame (12), a rear articulated frame (13), a steering control assembly and a crabbing control assembly, one end of the front articulated frame (11) is connected with the front frame (2), and the other end is articulated with the middle articulated frame (12); the crab walking mechanism is characterized in that one end of the rear hinged frame (13) is connected with the rear frame (3), the other end of the rear hinged frame is hinged with the middle hinged frame (12), the steering control assembly is respectively connected with the front hinged frame (11) and the rear hinged frame (13) and can drive the front hinged frame (11) to rotate relative to the middle hinged frame (12), and the crab walking control assembly is respectively connected with the middle hinged frame (12) and the front hinged frame (11) and is used for driving the front hinged frame (11) to rotate relative to the middle hinged frame (12) so as to realize crab walking movement.

3. The crabbing system for a tandem roller of claim 2, wherein the steering control assembly comprises: first steering cylinder (14) and second steering cylinder (15), first steering cylinder (14) with second steering cylinder (15) are located the both sides of middle articulated frame (12), and all with preceding frame (2) with back frame (3) are connected, hydraulic control subassembly (4) are used for control first steering cylinder (14) with second steering cylinder (15).

4. The crabbing system for the double-drum roller according to claim 3, wherein the crabbing control assembly comprises a first crabbing cylinder (16) and a second crabbing cylinder (17), the first crabbing cylinder (16) and the second crabbing cylinder (17) are positioned on two sides of the middle articulated frame (12) and are connected with the middle articulated frame (12) and the front frame (2), and the hydraulic control assembly (4) is used for controlling the first crabbing cylinder (16) and the second crabbing cylinder (17).

5. The crabbing system for the double-drum roller according to claim 2, wherein a rotary support (131) is arranged between the rear articulated frame (13) and the rear frame (3), and the rotary support (131) is in floating connection with both the rear articulated frame (13) and the rear frame (3).

6. The crab system for the double-drum roller according to claim 1, wherein the crab connecting assembly (1) further comprises a steering angle sensor (111), a crab angle sensor (19) and a neutral position return sensor (18), and the steering angle sensor (111), the crab angle sensor (19) and the neutral position return sensor (18) are all electrically connected with the vehicle control unit.

7. The crab system for the double-drum road roller as claimed in claim 4, wherein the hydraulic control assembly (4) comprises an oil supply assembly (43), a first reversing control valve (44), a steering hydraulic control assembly (41) and a crab hydraulic control assembly (42), an oil outlet of the oil supply assembly (43) is communicated with an oil inlet of the first reversing control valve (44), the steering hydraulic control assembly (41) is communicated with a first control port of the first reversing control valve (44) and is communicated with the first steering cylinder (14) and the second steering cylinder (15), the crab hydraulic control assembly (42) is communicated with a second control port of the first reversing control valve (44) and is communicated with the first crab cylinder (16) and the second crab cylinder (17), and the crab controller is communicated with the first reversing control valve (44), The steering hydraulic control assembly (41) and the crab hydraulic control assembly (42) are electrically connected.

8. The crab-walking system for a double-drum roller as claimed in claim 7, wherein the steering hydraulic control assembly (41) comprises a steering gear (411), the steering gear (411) is respectively communicated with the first steering cylinder (14) and the second steering cylinder (15), the steering gear (411) is electrically connected with the whole vehicle controller, and the steering gear (411) can control the first steering cylinder (14) to extend while the second steering cylinder (15) retracts, or the first steering cylinder (14) to retract while the second steering cylinder (15) extends.

9. The crab system for the double-drum road roller as claimed in claim 7, wherein the crab hydraulic control assembly (42) comprises a second reversing control valve (421), a first balance valve (422) and a second balance valve (423), the second reversing control valve (421) is electrically connected with the vehicle control unit, an oil inlet of the second reversing control valve (421) is communicated with a second control port of the first reversing control valve (44), an oil inlet of the first balance valve (422) is respectively communicated with a first control port of the second reversing control valve (421) and a control port of the second balance valve (423), an oil outlet of the first balance valve (422) is communicated with the rodless cavity of the first crab cylinder (16), an oil inlet of the second balance valve (423) is respectively communicated with a second control port of the second reversing control valve (421) and a control port of the first balance valve (422), an oil outlet of the second balance valve (423) is communicated with a rodless cavity of the second crab oil cylinder (17), a rodless cavity of the first crab oil cylinder (16) is communicated with a rod cavity of the second crab oil cylinder (17), a rodless cavity of the second crab oil cylinder (17) is communicated with a rod cavity of the first crab oil cylinder (16), and the second reversing control valve (421) can control a piston rod of the first crab oil cylinder (16) to extend and simultaneously retract a piston rod of the second crab oil cylinder (17), or control a piston rod of the second crab oil cylinder (17) to retract and simultaneously extend a piston rod of the first crab oil cylinder (16).

10. The crab system for the double-drum road roller as claimed in claim 9, wherein the crab hydraulic control assembly (42) further comprises a first check valve (42) and a second check valve (425), an oil inlet of the first check valve (42) is communicated with an oil inlet of the first balance valve (422), an oil outlet of the first check valve (42) is communicated with an oil outlet of the first balance valve (422) and a pilot oil port of the first balance valve (422), an oil inlet of the second check valve (425) is communicated with an oil inlet of the second balance valve (423), and an oil outlet of the second check valve (425) is communicated with an oil outlet of the second balance valve (423) and a pilot oil port of the second balance valve (423).

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