A walking mechanism of a material distributing and leveling machine suitable for a restricted paving work face

Abstract

This invention relates to the field of road construction equipment technology, and discloses a traveling mechanism for a concrete screed suitable for restricted paving surfaces. The mechanism includes a telescopic component, a hydraulic drive unit, a guide component, and a telescopic control device. The telescopic component is located on both sides of the main frame and includes a telescopic arm and a set of wheels. The hydraulic drive unit includes a hydraulic cylinder and an oil circuit control module for driving the telescopic arm to extend and retract. The guide component limits the extension and retraction direction through limit rails and sliders. The locking mechanism achieves position locking through pins and slots. The telescopic control device includes a laser rangefinder sensor and a controller for real-time distance detection and control of the extension and retraction actions. This invention allows for flexible adjustment of the traveling width according to the actual location of obstacles at the construction site, enabling the concrete screed to pass smoothly on road sections with varying bridge deck widths, ensuring the continuity of paving construction, and improving the quality and efficiency of bridge deck paving.

Description

Technical Field

[0001] This invention relates to the field of road construction equipment technology, and discloses a walking mechanism for a screed and leveling machine suitable for restricted paving surfaces. Background Technology

[0002] In the field of bridge construction, ultra-high performance concrete (UHPC), as a new type of cement-based composite material with ultra-high strength, high toughness, and excellent durability, has gradually become the mainstream material for steel bridge deck paving due to its ability to solve the problems of cracking and detachment in ordinary pavement layers. However, UHPC materials have high requirements for construction technology. The mixture needs to be evenly distributed and initially leveled during the working window to avoid secondary paving or later repairs, so as to obtain better quality steel bridge deck paving layers. This also places certain demands on the continuous operation process on the construction site.

[0003] Existing UHPC steel bridge deck construction typically employs a concrete placing screed for material placement and paving. This equipment, equipped with a traveling mechanism, can carry the mixed UHPC material longitudinally along the bridge, evenly distributing and paving the material onto the bridge deck to achieve initial leveling. For bridge construction scenarios where the bridge deck has been cleared and the work surface is unobstructed, this generally meets the requirements for continuous paving operations. During construction, the traveling mechanism of the concrete placing screed needs to travel along pre-set tracks on both sides of the bridge. The width of the paving work surface is determined by the width of the traveling mechanism itself and the track spacing.

[0004] Because existing walking mechanisms are mostly designed with fixed spacing, fixed dimensions, and fixed connections, they cannot be flexibly adjusted according to the actual location of obstacles at the construction site. In some restricted sections, such as bridges with cable-stayed anchorages or other structures that encroach on the space on both sides of the bridge, or with drainage ditches or existing guardrails that occupy the space, the concrete placing screed may be unable to move smoothly to carry out paving. In such cases, it is necessary to install other types of equipment for connection or to manually pave the section. This cannot meet the requirements for continuous operation of UHPC materials, not only slowing down the construction progress but also making it difficult to guarantee the quality of the bridge deck paving layer due to discontinuous paving of UHPC.

[0005] In order to further improve the quality of bridge deck paving and realize continuous paving operations on steel bridge decks, there is an urgent need in this field to optimize and improve the walking mechanism of the concrete screed, and to develop a walking mechanism that can flexibly cope with various restricted working surface environments and better assist the concrete screed in continuous paving construction on the bridge deck to solve the above problems. Summary of the Invention

[0006] To address the aforementioned problems, this invention discloses a traveling mechanism for a fabric screed suitable for restricted paving surfaces, comprising: a telescopic assembly, a hydraulic drive device, a guide assembly, and a telescopic control device; The telescopic components are at least two sets, respectively arranged on both sides of the main frame of the fabric leveling machine, including telescopic arms connected to the main frame via a hydraulic drive device and a set of walking wheels arranged at the end of the telescopic arms; The hydraulic drive device includes interconnected hydraulic cylinders and an oil circuit control module. There are at least two sets of hydraulic cylinders fixed to the bottom of the main frame, and their piston rods are respectively connected to the telescopic arm. The oil circuit control module is used to control the hydraulic oil supply of the hydraulic cylinders, thereby driving the piston rods to advance and retract. The guide assembly is disposed between the main frame and the telescopic arm, including a limiting guide rail fixed on the main frame and a slider fixed on the telescopic arm; the limiting guide rail is provided with stop bars at both ends, and the slider is embedded in the limiting guide rail and slides relative to the limiting guide rail to limit the telescopic process and telescopic direction of the telescopic arm; The telescopic control device includes a distance measuring sensor and a controller disposed at the front end of the main frame and facing both sides of the bridge respectively. The distance measuring sensor is used to acquire real-time distance information from both sides of the main frame to both sides of the bridge and transmit it to the controller. The controller is connected to the hydraulic circuit control module and controls the hydraulic circuit control module to advance or retract the piston rod of the corresponding side hydraulic cylinder according to the real-time distance information.

[0007] Furthermore, the oil circuit control module includes an oil tank, a hydraulic pump, a reversing valve, and a throttle valve connected in sequence. Each component is connected to the hydraulic cylinders on the left and right sides through hydraulic pipelines. The hydraulic pump delivers hydraulic oil from the oil tank to the hydraulic cylinders. The reversing valve is used to control the flow direction of the hydraulic oil to realize the extension or retraction of the piston rod. The throttle valve is used to adjust the flow rate of the hydraulic oil to control the extension and retraction speed.

[0008] Furthermore, the oil circuit control module also integrates a hydraulic lock, which can lock the oil pressure in the hydraulic cylinder cavity to lock the current position of the piston rod and the telescopic arm.

[0009] Furthermore, the slider is provided with a number of balls that roll in contact with the inner wall of the limiting guide rail.

[0010] Furthermore, the walking wheel assembly is placed on the walking tracks pre-installed on both sides of the bridge deck and moves along the walking tracks; the distance sensor is a laser distance sensor, whose laser emitting end is aligned with the sidewalls of the walking tracks on both sides of the bridge to obtain the distance information from both sides of the main frame to the sidewalls of the tracks in real time.

[0011] Furthermore, the controller pre-stores the initial distance parameters of the distance measuring sensor relative to the track sidewall. The controller uses a built-in telescopic control program to automatically calculate the difference between the real-time distance information and the initial distance parameters during construction. When the real-time distance information is greater than the initial distance parameters, the controller outputs a command to advance the hydraulic cylinder. When the real-time distance information is less than the initial distance parameters, the controller outputs a command to retract the hydraulic cylinder. The amount of advancement and retraction matches the value of the difference.

[0012] Furthermore, the telescopic control program is equipped with a cache subroutine, which has a pre-set position compensation range. When the distance sensor detects a change in distance, it first stores the telescopic command. When the fabric leveling machine moves forward to the preset compensation position, it outputs the telescopic command to the oil circuit control module to start the telescopic action.

[0013] Furthermore, the telescopic arm is connected to the vibratory leveling end of the screed machine. The vibratory leveling end is equipped with staggered leveling plates, including a middle main leveling plate, a left secondary leveling plate, and a right secondary leveling plate arranged in an alternating pattern with flush bottom surfaces. The middle main leveling plate is fixedly installed below the main frame. The central axes of the left and right secondary leveling plates are staggered from the central axis of the middle main leveling plate, and both are fixedly connected to the telescopic arms on their respective sides. When the telescopic arm extends and retracts, the left and right secondary leveling plates move synchronously with the telescopic arm, thereby achieving synchronous adjustment of the paving width.

[0014] Furthermore, the edges of the left sub-flat plate and the middle main flat plate are tightly abutted at their intersection, and the edges of the right sub-flat plate and the middle main flat plate are tightly abutted at their intersection.

[0015] The traveling mechanism of the fabric screed machine suitable for restricted paving surfaces provided by the present invention has the following advantages compared with the prior art: By coordinating the telescopic components, hydraulic drive device, guide component, and telescopic control device, the traveling mechanism of the concrete screed can adjust its width according to the actual environment of the construction site. When the concrete screed encounters obstacles such as cable anchors, drainage ditches, or guardrails that narrow the paving width, the telescopic control device uses distance sensors to detect the narrowing distance on both sides of the main frame in real time. The controller controls the extension and retraction of the hydraulic cylinders based on the acquired distance information, thereby driving the telescopic arm to move relative to the main frame, ensuring that the traveling process of the concrete screed is not interrupted. After leaving the narrowed section, the traveling width of the concrete screed can be restored by reversing the logic. In this process, the present invention can effectively ensure the continuity of UHPC material paving construction, avoid construction interruptions and secondary manual paving caused by obstacles, improve bridge deck paving quality and construction efficiency, and efficiently adapt to UHPC steel bridge deck paving construction scenarios with restricted paving surfaces. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the fabric leveling machine in this invention; Figure 2 This is a schematic diagram of the bottom view of the walking mechanism of the fabric leveling machine in this invention; Figure 3 This is a schematic diagram from another perspective of the walking mechanism of the fabric leveling machine in this invention; Figure 4 This is a schematic diagram of the extended state of the telescopic arm of the fabric leveling machine's walking mechanism in this invention; Figure 5 This is a schematic diagram of the guide component in the walking mechanism of the fabric leveling machine in this invention; Figure 6 for Figure 3 Enlarged schematic diagram of the contact position between the main platen and the auxiliary platen at point A.

[0017] In the attached diagram: 1. Main frame; 2. Traveling track; 3. Telescopic assembly; 31. Telescopic arm; 32. Traveling wheel set; 4. Hydraulic drive device; 41. Hydraulic cylinder; 42. Oil circuit control module; 421. Oil tank; 422. Hydraulic pump; 423. Directional valve; 424. Throttle valve; 43. Piston rod; 5. Guide assembly; 51. Slider; 512. Ball bearing; 52. Limit guide rail; 6. Distance sensor; 7. Middle main sizing plate; 8. Left auxiliary sizing plate; 9. Right auxiliary sizing plate. Detailed Implementation

[0018] The technical solution of the present invention will now be described with reference to the accompanying drawings. However, the described embodiments are only some embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that in the description of this invention, the terms "upper," "lower," "inner," "outer," etc., which indicate the direction or positional relationship, are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0020] In the description of this invention, unless otherwise explicitly specified and limited, "several" or "a plurality of" means two or more; the terms "set", "install", "connect", and "connect" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be electrical connections or mechanical connections; they can be indirect connections through an intermediate medium, or they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood in conjunction with the specific circumstances.

[0021] The accompanying drawings show various structural schematic diagrams according to embodiments disclosed in the present invention. These drawings are not drawn to scale, and some details may be enlarged or omitted for illustrative purposes.

[0022] like Figure 1 As shown, in a specific embodiment of the present invention, a screed is used to pave the UHPC steel bridge deck. Multiple cable-stayed anchors are installed on both sides of the bridge section crossing the river, located at the edges of the steel bridge deck. These anchors encroach on the screed's travel space, preventing the conventional fixed-width traveling mechanism from completing the full-width continuous paving operation along the preset track. Therefore, as... Figure 2 As shown, this embodiment provides a traveling mechanism for a concrete screed suitable for restricted paving surfaces. This traveling mechanism is mainly located on both sides of the main frame 1 of the concrete screed, and its function is to drive the main frame 1 and other components of the concrete screed to travel longitudinally along the bridge surface. Figure 2-5 As shown, it includes a telescopic component 3, a hydraulic drive device 4, a guide component 5, and a telescopic control device. These components form a complete telescopic walking system through mechanical connections, hydraulic pipeline drives, and electrical signal transmission control. During paving construction, the width of the concrete screed can be flexibly adjusted by the telescopic adjustment of the walking mechanism itself to adapt to width-constrained situations encountered during bridge construction. Details are as follows: The telescopic assembly 3 is configured in two sets, respectively located on both sides of the main frame 1 of the fabric screed. It includes a telescopic arm 31 connected to the main frame 1 via a hydraulic drive device 4 and a set of traveling wheels 32 located at the end of the telescopic arm 31. The traveling wheels and the telescopic arm 31 are made of high-strength alloy steel such as 40Cr, which gives them the hardness and load strength to support the fabric screed.

[0023] The hydraulic drive device 4 includes hydraulic cylinders 41 and an oil circuit control module 42 connected to each other. There are at least two sets of hydraulic cylinders 41 and they are fixed to the bottom of the main frame 1. Their piston rods 43 face the two sides of the fabric leveling machine and are connected to the telescopic arms 31 on the corresponding sides. The oil circuit control module 42 is used to control the oil supply of the hydraulic cylinders 41, thereby driving the piston rods 43 to advance and retract, thus synchronously controlling the telescopic arms 31 on both sides relative to the main frame 1.

[0024] To further constrain the telescopic arm 31's telescopic path and achieve stable linear telescopic movement, this mechanism incorporates a guide assembly 5 between the main frame 1 and the telescopic arm 31. Figure 4 As shown, the guide component 5 includes a limiting guide rail 52 fixed on the main frame 1 and a slider 51 fixed on the telescopic arm 31. The slider 51 is embedded in the limiting guide rail 52 and can slide relative to the limiting guide rail 52 as the telescopic arm 31 moves. The limiting guide rail 52 is provided with baffles and other structures at both ends to limit the telescopic arm 31 to always move horizontally in a preset direction, so as to prevent the telescopic arm 31 from deviating and shaking during the extension and retraction process, and the extension and retraction distance is always limited to the preset length range of the limiting guide rail 52.

[0025] Meanwhile, the slider 51 and the limit rail provide additional mechanical support points for the telescopic arm 31, preventing excessive vertical deformation of the telescopic arm 31 in a cantilevered state after extension, and further improving the structural stability of the entire walking mechanism.

[0026] Furthermore, in order to reduce frictional loss between the slider 51 and the limiting guide rail 52, such as... Figure 5 As shown, the surface of the slider 51 is also provided with multiple balls 512 that roll in contact with the inner wall of the limiting guide rail 52, which converts sliding friction into rolling friction, reduces resistance and component wear during the extension and retraction process, and extends the service life of the mechanism.

[0027] In terms of telescopic control, the telescopic control device set in this mechanism includes a distance sensor 6 and a controller located at the front end of the main frame 1 and facing both sides of the bridge. The distance sensor 6 is used to acquire real-time distance information from both sides of the main frame 1 to both sides of the bridge and transmit it to the controller. Based on the processing of the distance information, the controller controls the oil circuit control module 42 to control the hydraulic cylinder 41 on the same side as the distance sensor 6 to advance or retract the piston rod 43.

[0028] In the specific construction scenario, the ranging sensor 6 is a laser ranging sensor 6. In this embodiment, the material laying and leveling machine travels by laying travel tracks 2 on both sides of the bridge deck. The travel tracks 2 are arranged linearly along the longitudinal direction of the bridge deck, meaning that the width between the two tracks changes synchronously with the width of the bridge deck. In this scenario, the traveling wheel set 32 ​​rolls within the travel track 2, and the laser emitting end of the laser ranging sensor 6 can be aligned with the sidewalls of the travel tracks 2 on both sides of the bridge to obtain the distance information from both sides of the main frame 1 to the sidewalls of the tracks in real time, and transmit the obtained information to the controller.

[0029] During actual construction, the screed spreader lays UHPC material on the bridge deck along the travel track 2. When the width of the bridge deck changes, the travel track 2 changes its width synchronously, and the distance sensor 6 detects the change in distance between the main frame 1 and the travel track 2 in real time. The controller pre-stores the initial distance parameters of the ranging sensor 6 to the sidewall of the track. After acquiring the real-time distance information from both sides of the main frame 1 to both sides of the bridge, it automatically calculates the difference between the real-time distance and the initial distance through the built-in telescopic control program. Since the track changes synchronously with the bridge surface alignment, when the calculated real-time distance is greater than the initial distance parameter, i.e., the difference is positive, it indicates that the width of the bridge surface in the current section has widened, and there is extra space between the walking wheel set 32 ​​and the sidewall of the track. The controller outputs the instruction to the hydraulic control module 42 to push the hydraulic cylinder 41, driving the telescopic arms 31 on both sides to extend outward until the difference is zero. When the calculated real-time distance is less than the initial distance parameter, i.e., the difference is negative, it indicates that there may be obstacles on the side of the bridge occupying the walking space, causing the track to narrow. The controller outputs the instruction to retract the hydraulic cylinder 41, driving the telescopic arms 31 to retract inward, and similarly adjusting the telescopic distance to zero, realizing the automatic adaptation of the position of the walking wheel set 32.

[0030] In other construction scenarios, such as when there are continuous raised sides (like guardrails) on both sides of a bridge, the distance sensor 6 can also directly face the side to sense the distance, and the controller's data processing and telescopic control are adapted accordingly.

[0031] It should be noted that, due to the installation of a telescopic walking mechanism, the vibratory leveling end of the paving material laying machine is also adjusted accordingly to meet the leveling operation of the paving material across the entire width of the bridge. Specifically, the vibratory leveling end is equipped with staggered leveling plates, including a central main leveling plate 7, a left auxiliary leveling plate 8, and a right auxiliary leveling plate 8. The central main leveling plate 7 is fixedly installed below the main frame 1, and its width is designed to not exceed the narrowest width of the bridge deck paving surface. The left and right auxiliary leveling plates 8 are spliced ​​with the central main leveling plate 7 in a staggered manner and are respectively fixedly connected to the corresponding telescopic arms 31 on both sides through connecting rods or other means. The sides of the two auxiliary leveling plates (the sides facing the bridge deck) are always flush with the side walls of the walking track 2 to cover the paving surface in the middle of the two walking tracks 2. When the telescopic boom 31 extends and retracts under the drive of the hydraulic cylinder 41, the left and right auxiliary leveling plates 8 move synchronously with the telescopic boom 31, achieving synchronous adjustment of the paving width. Furthermore, to ensure paving quality, the edges of the left and right auxiliary leveling plates 8 and the edge of the central main leveling plate 7 are tightly abutted at staggered points, and the bottom surfaces of each leveling plate are flush, forming a complete paving plane to ensure uniform vibration and leveling of the UHPC material within the paving width. Regarding the specific abutment method, such as... Figure 6 As shown, in this example, the main slab 7 and the secondary slab are joined by interlocking male and female strips. At the joint, the main slab 7 has a male strip on its side, and the secondary slab has a female strip on its side, the size and shape of which correspond to the male strip. During the lateral extension and retraction of the telescopic arm 31, the secondary slab moves with the telescopic arm 31 in coordination with the male and female strips. This interlocking joint serves two purposes: firstly, it guides the connection between the main slab 7 and the secondary slab; secondly, it prevents excessive paving material from encroaching on the joints of the slabs, thus ensuring smooth movement of the slabs during width changes.

[0032] Furthermore, to achieve more precise control over the telescopic movement of the traveling mechanism, the hydraulic control module 42 specifically includes an oil tank 421, a hydraulic pump 422, a directional valve 423, and a throttle valve 424 connected in sequence. Each component is connected to the hydraulic cavities on the left and right sides of the hydraulic cylinder 41 via hydraulic pipelines. The hydraulic pump 422 delivers hydraulic oil from the oil tank 421 into the hydraulic cylinder cavity. The directional valve 423 changes the flow direction of the hydraulic oil, thereby enabling the extension or retraction of the piston rods 43 on the left and right sides of the hydraulic cylinder 41. The throttle valve 424 controls the extension and retraction speed of the telescopic arm 31 by adjusting the flow rate of the hydraulic oil, preventing excessively rapid movements from affecting positional accuracy. Furthermore, the hydraulic control module 42 is also equipped with a hydraulic lock. When the directional valve 423 is in the neutral position and the telescopic movement is stopped, the hydraulic lock can directly lock the oil pressure in the hydraulic cylinder cavity, locking the current position of the telescopic arm 31. This prevents the piston rods 43 from moving unexpectedly due to oil pressure leakage, thus affecting the position of the telescopic arm 31 and improving the reliability of telescopic positioning.

[0033] Under the precise control scheme of the aforementioned hydraulic control module 42, the controller's telescopic control program plays a crucial role in ensuring the synchronization between the distance change measured by the distance sensor 6 and the telescopic control. Therefore, considering the installation position of the distance sensor 6 and the walking state of the fabric screed, the telescopic control program, in addition to performing the aforementioned simple differential positive and negative correspondence advance or retraction processing, further analyzes the data and sets up a cache subroutine. Specifically, as the fabric screed moves forward along the longitudinal direction of the bridge, the distance change signal detected by the distance sensor 6 is earlier than the time it takes to reach the obstacle area at the current position. Therefore, a position compensation interval is preset in the cache subroutine: when the distance sensor 6 detects a distance change, it first stores the change signal; when the fabric screed moves forward to the preset compensation position, it outputs a telescopic command to the hydraulic control module 42 to initiate the telescopic action. This ensures that the walking wheel set 32 ​​completes the width adjustment before reaching the widening or narrowing track section, avoiding collisions between the walking wheel set 32 ​​and the track or obstacles, and ensuring smooth walking. Taking the walking track 2 mode as an example, the specific logic of the telescopic control program and its cache subroutine in the controller is as follows: First, before construction, the relative distance between the distance sensor 6 and the walking track 2 is measured at the initial bridge deck width, and the initial distance parameter is recorded as D. The distance between the distance sensor 6 and the foremost end of the walking wheel set 32 ​​is measured as S. At the same time, the walking speed of the fabric leveling machine is recorded as V, and the sampling period t of the distance sensor 6 is recorded. The above parameters D, S, V, and t are entered into the program, and the real-time distance data is set as d, and the extension speed of the telescopic arm 31 is set as v. During construction, the difference between the real-time distance data and the initial distance parameter ΔD=dD is first calculated, and then the extension speed v=ΔD / t of the telescopic boom 31 is output. At this time, the controller only caches the output v to the cache subroutine. At the same time, the time node T for executing the above v is obtained according to T=S / V. That is, after waiting for T time, the cache subroutine transmits the above v to the oil circuit control module 42. The oil circuit control module 42 performs reverse deduction based on the relationship between the opening of the throttle valve 424 and the hydraulic oil output efficiency (increasing the opening of the throttle valve 424 increases the hydraulic oil flow and accelerates the extension speed of the telescopic boom 31, and vice versa). The logic of the reverse deduction can be executed or calculated by referring to the factory parameters of the hydraulic cylinder 41, or by conducting equipment tests before construction, thereby generating a correspondence table between the contraction rate v and the opening of the throttle valve 424, and storing it in the controller. The instruction mapping between the controller and the oil circuit control module 42 can be executed by directly calling the pre-calibrated correspondence table, without the need for real-time calculation during construction, thus ensuring the timeliness of control response.

[0034] For example, in this embodiment, the sampling period of the distance sensor 6 is 0.01s, its initial distance to the sidewalls of the left and right walking guide rails is 20cm, and its distance relative to the foremost point of the walking wheel set 32 ​​is 20cm. The traveling speed of the material leveling machine is 0.1m / s. During construction, when the narrowing of the left side of the bridge deck is detected at a certain moment, the real-time distance data of the left distance sensor 6 is 19.98cm. The telescopic control program is activated, and ΔD is calculated to be -0.02cm. The output telescopic speed v = -0.02cm / 0.01s = -2cm / s, where the negative sign represents inward contraction. Simultaneously, the calculation of the execution time... The interval node T = 20cm / (10cm / s) = 2s. After waiting for 2 seconds, when the traveling wheel set 32 ​​reaches the currently detected width change position, the controller converts the telescopic speed into the opening information of the throttle valve 424 of the left hydraulic cylinder 41 by calling the corresponding relationship table. This information is then output to the oil circuit control module 42, which drives the reversing valve 423 to change the oil inlet direction of the hydraulic cylinder 41 and adjusts the opening of the throttle valve 424. This causes the left telescopic arm 31 to retract inward at a speed of 2cm / s, perfectly matching the width change at the current position, thus achieving precise synchronization between the traveling width adjustment and the paving position. During this period, since the bridge deck width does not change, the right hydraulic cylinder 41 remains stationary under the hydraulic lock. Through the above process, the telescopic speed of the telescopic arm 31 is always matched with the traveling speed of the concrete screed and the rate of width change on site, avoiding positional mismatch caused by premature or delayed telescopic actions, and ensuring the continuous and smooth operation of the concrete screed.

[0035] After the paving work on the restricted section is completed, if the working face width returns to its original size, the distance sensor 6 will detect the distance change and the controller will re-drive the hydraulic cylinder 41 to control the telescopic arm 31 to reset to the initial working width, thus resuming the normal full-width continuous paving operation. The adjustment process of this traveling mechanism is fully automated, requiring no additional manual intervention to adjust the width of the traveling mechanism. This reduces the time spent on manual adjustments during construction, ensuring the continuity of continuous paving operations. It can also adapt to changes in the space of the restricted working face in real time, avoiding the problems of conventional fixed-width traveling mechanisms being unable to pass through obstacles and having to pave in sections, affecting the integrity and flatness of the paved layer. This effectively ensures the construction quality of the UHPC paving on the steel bridge deck.

[0036] Taking the above-mentioned track-type paving operation as an example, the specific implementation process of the walking mechanism of the present invention is described as follows: Before construction, the width variation of the bridge within the paving operation area is measured in advance. The propulsion and retraction range of the hydraulic cylinder 41, as well as the length of components such as the limit guide rail 52 and the telescopic arm 31, are set according to the width variation range, and the concrete screed is assembled. The traveling wheel set 32 ​​of the concrete screed is placed on the traveling tracks 2 pre-laid on both sides of the bridge deck. The traveling tracks 2 are arranged synchronously and linearly according to the width of the bridge deck. At the same time, the distance between the distance sensor 6 and the side wall of the traveling track 2 in the initial state is recorded and entered into the controller as the initial distance parameter.

[0037] When the paving operation is started, for road sections of normal width, the walking wheel set 32 ​​travels longitudinally along the track, driving the entire material laying and leveling machine to carry out continuous paving operations; the UHPC paving material received inside the material laying and leveling machine is evenly distributed onto the bridge surface, and the staggered leveling plate vibrates and flattens the paving material.

[0038] When the fabric screed travels longitudinally along the bridge and approaches obstacles such as the cable anchorage, i.e., the section where the bridge deck narrows, the distance sensor 6 detects in real time that the distance between the corresponding side and the sidewall of the track is decreasing. The controller immediately calculates the difference between the real-time distance data and the initial distance parameter. According to the above-mentioned telescopic control program, the corresponding retraction command is output to control the hydraulic cylinder 41 to retract the piston rod 43. This causes the telescopic arms 31 on both sides to retract inward synchronously under the guidance of the guide assembly 5. The walking wheel set 32 ​​moves inward with the telescopic arms 31 and smoothly enters the walking track 2 corresponding to the narrowed section.

[0039] When the telescopic boom 31 extends and retracts to adjust the walking width, the left and right auxiliary leveling plates connected to the telescopic boom 31 will move synchronously with the telescopic boom 31. While adjusting the width of the walking mechanism, the paving and leveling width is adjusted simultaneously, without the need for additional adjustments to the leveling mechanism, thus ensuring the continuity of the paving operation.

[0040] After the screed has completely passed the obstacle area, the distance sensor 6 detects that the distance has been restored, and the controller then controls the telescopic arm 31 to extend outward and reset. The screed plate then resets again, maintaining full coverage of the bridge deck throughout the entire process. Without stopping the machine for manual adjustment, continuous paving operations on restricted working surfaces can be achieved, ensuring the construction quality and progress of UHPC paving.

[0041] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A traveling mechanism for a fabric screed suitable for confined paving surfaces, characterized in that, include: Telescopic components, hydraulic drive units, guide components, and telescopic control units; The telescopic components are at least two sets, respectively arranged on both sides of the main frame of the fabric leveling machine, including telescopic arms connected to the main frame via a hydraulic drive device and a set of walking wheels arranged at the end of the telescopic arms; The hydraulic drive device includes interconnected hydraulic cylinders and an oil circuit control module. There are at least two sets of hydraulic cylinders fixed to the bottom of the main frame, and their piston rods are respectively connected to the telescopic arm. The oil circuit control module is used to control the hydraulic oil supply of the hydraulic cylinders, thereby driving the piston rods to advance and retract. The guide assembly is disposed between the main frame and the telescopic arm, including a limiting guide rail fixed on the main frame and a slider fixed on the telescopic arm; the limiting guide rail is provided with stop bars at both ends, and the slider is embedded in the limiting guide rail and slides relative to the limiting guide rail to limit the telescopic process and telescopic direction of the telescopic arm; The telescopic control device includes a distance measuring sensor and a controller disposed at the front end of the main frame and facing both sides of the bridge respectively. The distance measuring sensor is used to acquire real-time distance information from both sides of the main frame to both sides of the bridge and transmit it to the controller. The controller is connected to the hydraulic circuit control module and controls the hydraulic circuit control module to advance or retract the piston rod of the corresponding side hydraulic cylinder according to the real-time distance information.

2. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 1, characterized in that, The oil circuit control module includes an oil tank, a hydraulic pump, a directional valve, and a throttle valve connected in sequence. Each component is connected to the hydraulic cylinders on the left and right sides through hydraulic pipelines. The hydraulic pump delivers hydraulic oil from the oil tank to the hydraulic cylinders. The directional valve is used to control the flow direction of the hydraulic oil to realize the extension or retraction of the piston rod. The throttle valve is used to adjust the flow rate of the hydraulic oil to control the extension and retraction speed.

3. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 2, characterized in that, The oil circuit control module also integrates a hydraulic lock, which can lock the oil pressure in the hydraulic cylinder cavity to lock the current position of the piston rod and telescopic arm.

4. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 1, characterized in that, The slider is provided with several balls that roll in contact with the inner wall of the limiting guide rail.

5. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 1, characterized in that, The walking wheel set is placed on the walking track pre-installed on both sides of the bridge deck and moves along the walking track; the distance sensor is a laser distance sensor, whose laser emission end is aligned with the side wall of the walking track on both sides of the bridge to obtain the distance information from both sides of the main frame to the side wall of the track in real time.

6. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 1, characterized in that, The controller has pre-stored the initial distance parameters of the distance measuring sensor relative to the track sidewall. The controller uses a built-in telescopic control program to automatically calculate the difference between the real-time distance information and the initial distance parameters during construction. When the real-time distance information is greater than the initial distance parameters, the controller outputs a command to advance the hydraulic cylinder. When the real-time distance information is less than the initial distance parameters, the controller outputs a command to retract the hydraulic cylinder. The amount of advancement and retraction matches the value of the difference.

7. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 6, characterized in that, The telescopic control program is equipped with a cache subroutine, which has a pre-set position compensation range. When the distance sensor detects a change in distance, it first stores the telescopic command. When the fabric leveling machine moves forward to the preset compensation position, it outputs the telescopic command to the oil circuit control module to start the telescopic action.

8. A traveling mechanism for a fabric screed suitable for confined paving surfaces according to any one of claims 1-7, characterized in that, The telescopic arm is connected to the vibratory leveling end of the fabric leveling machine. The vibratory leveling end is equipped with staggered leveling plates, including a middle main leveling plate, a left auxiliary leveling plate, and a right auxiliary leveling plate arranged in an alternating manner with flush bottom surfaces. The middle main leveling plate is fixedly installed below the main frame. The central axes of the left and right auxiliary leveling plates are staggered from the central axis of the middle main leveling plate, and both are fixedly connected to the telescopic arms on their respective sides. When the telescopic arm extends or retracts, the left and right auxiliary leveling plates move synchronously with the telescopic arm.

9. The traveling mechanism of a fabric screed suitable for restricted paving surfaces according to claim 8, characterized in that, The edges of the left sub-flat plate and the middle main flat plate are tightly abutted at their intersection, and the edges of the right sub-flat plate and the middle main flat plate are tightly abutted at their intersection.

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