Asphalt paver

Abstract

An asphalt finisher is configured to extend and contract in width of a fixed plate on a front side of a screw rod on which paving material is laid. The asphalt finisher has a tractor, a screw rod on which paving material is laid on a rear side of the tractor, a screed that compacts the paving material on a rear side of the screw rod, a fixed plate that is arranged on a front side of the screw rod, and a connecting member that connects the screed and the fixed plate. The screed is configured to extend and contract in width in a vehicle width direction, and the fixed plate is configured to extend and contract in width in the vehicle width direction in conjunction with extension and contraction of the screed in the vehicle width direction via the connecting member.

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2024-207833, filed on November 29, 2024. The entire contents of that Japanese application are incorporated herein by reference.

[0002] This invention relates to an asphalt rolling machine. Background Technology

[0003] Conventionally, in asphalt rollers, a structure is known in which a fixing plate is provided on the front side of the screw for laying paving material to prevent the paving material from splashing forward. On the other hand, a structure is also known in which a leveling machine for compacting paving material is provided on the rear side of the screw, and the width of the leveling machine in the vehicle width direction can be expanded (for example, see Patent Document 1).

[0004] Patent Document 1: Japanese Patent No. 7291189 When the width of the screed is expanded, for example, when the expansion screw is connected according to the expanded width of the screed, if the width of the fixing plate is not expanded at the same time, the paving material is prone to splashing forward, which will prevent the paving material from being delivered smoothly to both ends of the screw. Therefore, if the width of the fixing plate is expanded manually, the expansion operation requires a lot of manpower and time, resulting in reduced work efficiency.

[0005] Here, Patent Document 1 discloses a structure that uses hydraulic or pneumatic pressure to expand the width of a fixing plate by means of a control unit.

[0006] However, in the structure disclosed in Patent Document 1, expanding the width of the fixing plate requires hydraulic cylinders or pneumatic cylinders, and even circuitry in the control unit, thus increasing the complexity of the structure and raising costs. Furthermore, if the structure disclosed in Patent Document 1 is to be added, the fixing plate or control unit itself must be modified, requiring a significant amount of time. Summary of the Invention

[0007] Therefore, it is preferable to provide an asphalt roller that can be configured with a simple structure to extend and retract the width of the fixing plate on the front side of the screw for laying paving materials.

[0008] The asphalt rolling mill according to the present invention has the following features: Traction machine; The screw is used to lay paving material on the rear side of the traction machine; The leveling machine compacts the paving material on the rear side of the screw; A fixing plate is disposed on the front side of the screw; and The connecting component connects the leveling machine to the fixing plate. The leveling mechanism allows for expansion and contraction of its width in the vehicle width direction. The fixing plate is configured such that its width in the vehicle width direction can be extended or retracted in conjunction with the width of the leveling machine in the vehicle width direction via the connecting component.

[0009] Invention Effects According to the present invention, the width of the fixing plate, which is configured to extend or retract on the front side of the screw for laying the paving material, can be easily adjusted with a simple structure. Attached Figure Description

[0010] Figure 1 This is a left view showing the schematic structure of the asphalt roller according to an embodiment of the present invention.

[0011] Figure 2 This is a top view showing the schematic structure of the asphalt roller according to an embodiment of the present invention.

[0012] Figure 3 This is a block diagram illustrating a structural example of a controller and a device connected to the controller according to an embodiment of the present invention.

[0013] Figure 4 This is a diagram showing the structure of the screw and the leveling machine in the asphalt roller according to this embodiment.

[0014] Figure 5 This is a diagram illustrating the connection between the side plate and the fixing plate of the linkage component according to this embodiment.

[0015] Figure 6A This is a diagram showing the left connecting rod assembly mounted on the left side plate from above.

[0016] Figure 6B This is a diagram showing the left connecting rod assembly mounted on the left side plate L from the side.

[0017] Figure 7 This is a diagram used to illustrate the function of the connecting rod component according to this embodiment.

[0018] Figure 8 This is a diagram used to illustrate the function of the connecting rod component according to this embodiment.

[0019] Figure 9 This is a diagram illustrating the method for storing the connecting rod component according to this embodiment.

[0020] Figure 10 This is a diagram illustrating the method for storing the connecting rod component according to this embodiment.

[0021] Figure 11 This diagram illustrates the effect of changes in the height of the leveling machine.

[0022] Figure 12 This diagram illustrates the effect of changes in the height of the leveling machine.

[0023] In the diagram: 1-Tractor, 1G-Guide rail, 1S-Driver's seat, 2-Hopper, 2b-Push roller, 3-Leveler, 3A-Leveling arm, 5-Rear wheel, 6-Front wheel, 23-Leveling cylinder, 24-Hopper cylinder, 25-Leveler lifting cylinder, 27-Leveler telescopic cylinder, 30-Main leveler, 31-Telescopic leveler, 40-Side plate, 41-Telescopic plow plate, 42-Leveler step, 43-Fixed plate, 47-Traffic speed sensor, 48-Auxiliary storage device, 48a-Dispatch information storage unit, 48b-Vehicle width storage unit, 50-Controller, 50a-Acquisition unit, 50b-Moving path 50c-Diameter calculation unit, 50d-Leveling machine control unit, 51-Spatial identification device, 52-Drive system controller, 53-Communication device, 54-GPS module, 55-Leveling machine control device, 57-Leveling machine length detection device, 60-Connecting rod assembly, 61a, 61b-Side part, 62a, 62b-Fixing plate, 63-Loading cylinder, 64-Fixing plate, 65-Sliding plate, 66-Sliding mechanism, 67, 69b-Holding hole, 68-Stop block, 69a-Holding plate, 100-Asphalt roller, CV-Conveyor, OP-Inlet, SC-Screw. Detailed Implementation

[0024] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Additionally, in the drawings, the same or corresponding structures are sometimes labeled with the same symbols and descriptions are omitted.

[0025] Figure 1 This is a left view showing the schematic structure of the asphalt roller 100 according to an embodiment of the present invention. Figure 2 This is a top view showing the schematic structure of the asphalt roller 100 according to an embodiment of the present invention.

[0026] The asphalt trolley 100 mainly consists of a traction machine 1, a hopper 2, and a leveling machine 3. Figure 1 In the example, the asphalt roller 100 is configured such that its length direction corresponds to the X-axis direction and its width direction corresponds to the Y-axis direction. Furthermore, the Z-axis is configured orthogonally to both the X-axis and Y-axis. Specifically, the front side in the length direction corresponds to the +X side, the rear side in the length direction corresponds to the -X side, the left side in the width direction corresponds to the +Y side, the right side in the width direction corresponds to the -Y side, the upper side in the vertical direction corresponds to the +Z side, and the lower side in the vertical direction corresponds to the -Z side.

[0027] The traction unit 1 is a mechanism used to move the asphalt roller 100. Figure 1 and Figure 2In the example, the tractor 1 uses a rear-wheel motor to rotate the rear wheel 5 and a front-wheel motor to rotate the front wheel 6, thereby moving the asphalt tumbler 100. Both the rear-wheel motor 20 and the front-wheel motor 22 are hydraulic motors that rotate by receiving working oil from a hydraulic pump. However, the tractor 1 may also have tracks instead of wheels.

[0028] The asphalt roller 100 described in this embodiment changes its direction of travel by controlling the steering angle of the front wheel 6. Furthermore, when the asphalt roller 100 is equipped with tracks instead of wheels, it changes its direction of travel by changing the rotational speed between the starting wheel in the right track and the starting wheel in the left track.

[0029] Hopper 2 is a mechanism for receiving paving materials. Paving materials may include, for example, asphalt mixtures. Figure 1 and Figure 2 In the example, the hopper 2 is located in front of the tractor 1 (+X side) and is configured to open or close in the Y-axis direction (vehicle width direction) via the hopper cylinder 24. The asphalt roller 100 typically keeps the hopper 2 fully open and receives paving material from the rack of the dump truck. Furthermore, even when receiving paving material from the rack of the dump truck bed, the asphalt roller 100 continues to travel while pushing the dump truck bed forward via the push roller 2b. Figure 1 and Figure 2 This indicates the asphalt trolley 100 when hopper 2 is fully open. The operator of the asphalt trolley 100 closes hopper 2 when the paving material in hopper 2 decreases, concentrating the paving material near the inner wall of hopper 2 in the center of hopper 2. This allows the conveyor CV, located at the bottom of the center of hopper 2, to transport paving material to the rear of the tractor 1. The paving material transported to the rear (-X side) of the tractor 1 is laid along the vehicle width direction at the rear of the tractor 1 and the front of the leveler 3 via the screw SC.

[0030] Hopper cylinder 24 is a hydraulic actuator that opens or closes hopper 2; it retracts when hopper 2 is opened and extends when hopper 2 is closed. Hopper cylinder 24 includes a left hopper cylinder 24L and a right hopper cylinder 24R.

[0031] The conveyor CV is driven by a hydraulic motor that rotates by receiving working oil from a hydraulic pump. Figure 1 and Figure 2 In the example, the conveyor CV is configured to transport the paving material in the hopper 2 to the rear of the traction machine 1 via a conveying channel. The conveying channel is a generally rectangular space formed inside the traction machine 1, with a generally rectangular inlet OP on the front surface of the traction machine 1 that opens into the hopper 2. Specifically, the conveyor CV includes a left conveyor and a right conveyor.

[0032] The screw SC is a device for laying paving material on the rear side of the traction machine 1. The screw SC is driven by a hydraulic motor that rotates by receiving working oil from a hydraulic pump. Specifically, the screw SC includes a left screw SCL located on the left side of the asphalt roller 100 and a right screw SCR located on the right side of the asphalt roller 100.

[0033] The leveling machine 3 compacts the paving material behind the screw SC. The leveling machine 3 is a mechanism used to evenly spread the paving material. Figure 1 and Figure 2 In the example, the leveling machine 3 mainly includes a main leveling machine 30 and a telescopic leveling machine 31. The main leveling machine 30 includes a left main leveling machine and a right main leveling machine. The telescopic leveling machine 31 includes a left telescopic leveling machine 31L and a right telescopic leveling machine 31R. The main leveling machine 30, the left telescopic leveling machine 31L, and the right telescopic leveling machine 31R are staggered in a non-overlapping manner in the vehicle length direction. Specifically, the left telescopic leveling machine 31L is arranged behind the main leveling machine 30, and the right telescopic leveling machine 31R is arranged behind the left telescopic leveling machine 31L. The leveling machine 3 is a floating leveling machine towed by the tractor 1 and is connected to the tractor 1 via the leveling arm 3A. The leveling machine 3 moves up and down together with the leveling arm 3A by the extension and retraction of the leveling machine lifting cylinder 25. The leveling arm 3A includes a left leveling arm 3AL and a right leveling arm 3AR.

[0034] The telescopic leveler 31 is configured to extend or retract in width along the vehicle width direction via a telescopic cylinder 27. The telescopic cylinder 27 is supported by a support portion fixed to the rear surface of the frame of the main leveler 30 and is configured to extend or retract the telescopic leveler 31 along the vehicle width direction (Y-axis direction). Specifically, the telescopic cylinder 27 includes a left telescopic cylinder 27L (an example of a left-side leveling device) and a right telescopic cylinder 27R (an example of a right-side leveling device). The left telescopic cylinder 27L allows the left telescopic leveler 31L to extend or retract to the left relative to the main leveler 30 in the vehicle width direction. The right telescopic cylinder 27R allows the right telescopic leveler 31R to extend or retract to the right relative to the main leveler 30 in the vehicle width direction.

[0035] The leveling arm 3A is configured to connect the leveling machine 3 to the traction machine 1. Specifically, one end of the leveling arm 3A is connected to the leveling machine 3, and the other end is rotatably connected to the traction machine 1.

[0036] The leveling cylinder 23 is a hydraulic cylinder that moves the front end of the leveling arm 3A up and down to adjust the evenness and thickness of the paving material (paving thickness). Figure 1 and Figure 2In the example, the cylinder part of the leveling cylinder 23 is connected to the traction machine 1, and the rod part is connected to the front end of the leveling arm 3A. Furthermore, the front end of the leveling arm 3A is slidably supported by the traction machine 1. When the paving thickness is increased, the controller 50 causes the working oil discharged from the hydraulic pump to flow into the rod-side oil chamber of the leveling cylinder 23, causing the leveling cylinder 23 to contract and the front end of the leveling arm 3A to rise. On the other hand, when the paving thickness is decreased, the controller 50 causes the working oil in the rod-side oil chamber of the leveling cylinder 23 to flow out, causing the leveling cylinder 23 to extend and the front end of the leveling arm 3A to descend. The leveling cylinder 23 includes a left leveling cylinder 23L and a right leveling cylinder 23R.

[0037] The leveling machine lifting cylinder 25 is a hydraulic cylinder used to lift the leveling machine 3. Figure 1 and Figure 2 In the example, the cylinder of the leveling machine lifting cylinder 25 is connected to the traction machine 1, and the rod is connected to the rear end of the leveling arm 3A. When the leveling machine 3 is lifted, the controller 50 causes the working oil discharged by the hydraulic pump to flow into the rod-side oil chamber of the leveling machine lifting cylinder 25. As a result, the leveling machine lifting cylinder 25 retracts, the rear end of the leveling arm 3A is lifted, and thus the leveling machine 3 is lifted. On the other hand, when the lifted leveling machine 3 is lowered, the controller 50 can cause the working oil in the rod-side oil chamber of the leveling machine lifting cylinder 25 to flow out. As a result, the leveling machine lifting cylinder 25 is stretched by the weight of the leveling machine 3, the rear end of the leveling arm 3A is lowered, and thus the leveling machine 3 is lowered. The leveling machine lifting cylinder 25 includes a left leveling machine lifting cylinder 25L and a right leveling machine lifting cylinder 25R.

[0038] Side plates 40 are installed at the outer ends of the telescopic leveler 31 in the vehicle width direction. The side plates 40 include a left side plate 40L and a right side plate 40R. Specifically, the left side plate 40L is installed at the outer end (left end) of the left telescopic leveler 31L, and the right side plate 40R is installed at the outer end (right end) of the right telescopic leveler 31R.

[0039] like Figure 2 As shown, the end of the side plate 40 in the travel direction (positive X-axis direction) extends to the extension line of the screw SC in the length direction (rotation axis direction).

[0040] Side plate 40 is also installed at the outer end of telescopic plow plate 41. Telescopic plow plate 41 is a component used to adjust the amount of paving material retained near telescopic leveler 31 in the paving material laid by screw SC, and is configured to extend and retract along the vehicle width direction together with telescopic leveler 31.

[0041] Specifically, the telescopic plow plate 41 is a plate-shaped component extending in the vehicle width direction, including a left telescopic plow plate 41L and a right telescopic plow plate 41R. Moreover, a left side plate 40L (an example of a plate part) is installed at the outer end (left end) of the left telescopic plow plate 41L, and a right side plate 40R (an example of a plate part) is installed at the outer end (right end) of the right telescopic plow plate 41R.

[0042] The telescopic plow plate 41 is configured to adjust its height in the Z-axis direction independently of the telescopic leveler 31 and the side plate 40. The asphalt roller 100 adjusts the gap between the lower end of the telescopic plow plate 41 and the roadbed by moving the telescopic plow plate 41 up and down, thereby adjusting the amount of paving material passing through the gap. Therefore, by moving the telescopic plow plate 41 up and down, the asphalt roller 100 can adjust the amount (height) of paving material remaining on the rear side (-X side) of the telescopic plow plate 41 and the front side (+X side) of the telescopic leveler 31, and even adjust the amount of paving material entering the lower side of the telescopic leveler 31.

[0043] The leveling machine step 42 is a component that forms the footboard for workers to operate behind the leveling machine 3. Specifically, the leveling machine step 42 includes a left leveling machine step 42L, a central leveling machine step 42C, and a right leveling machine step 42R.

[0044] The fixing plate 43 is a plate-shaped component used to prevent the paving material delivered by the screw SC in the vehicle width direction from scattering in front of the screw SC, so that the paving material is properly delivered by the screw SC in the vehicle width direction. Therefore, the fixing plate 43 is disposed on the front side of the screw SC. Figure 1 and Figure 2 In the example, the fixing plate 43 includes a left fixing plate 43L and a right fixing plate 43R.

[0045] Furthermore, the asphalt tumbler 100 according to this embodiment includes a connecting rod assembly 60. The connecting rod assembly 60 is an example of a connecting member in this invention, and it has a left connecting rod assembly 60L and a right connecting rod assembly 60R. The left connecting rod assembly 60L connects the left telescopic screed 31L and the left fixed plate 43L by being mounted on the left side plate 40L and the left fixed plate 43L. The right connecting rod assembly 60R connects the right telescopic screed 31R and the right fixed plate 43R by being mounted on the right side plate 40R and the right fixed plate 43R. Details regarding the connecting rod assembly 60 will be described later.

[0046] Controller 50 is a control device for controlling the asphalt roller 100. Figure 1 and Figure 2In the example, the controller 50 is a computer including a CPU, volatile memory, and non-volatile memory, mounted on the traction machine 1. Various functions of the controller 50 are implemented, for example, by the CPU executing programs stored in the non-volatile memory. Furthermore, the various functions implemented by the controller 50 include, for example, controlling the output of the hydraulic pump supplying working oil for driving the hydraulic actuator, and controlling the flow of working oil between the hydraulic actuator and the hydraulic pump. Additionally, the hydraulic actuator includes a hydraulic cylinder and a hydraulic motor.

[0047] The communication device 53 is configured to control communication between the asphalt roller 100 and equipment located outside the asphalt roller 100. In this embodiment, the communication device 53 is located in front of the driver's seat 1S and controls communication via mobile phone communication networks, short-range wireless communication networks, or satellite communication networks.

[0048] The GPS module 54 is an example of a GNSS (Global Navigation Satellite System) module, receiving location information representing the result of two-dimensional positioning based on GPS (Global Positioning System). The location information includes information representing the position of the asphalt roller 100 in latitude and longitude. Furthermore, while GPS is used as the method for acquiring location information in this embodiment, the method is not limited, and other known methods may also be used.

[0049] A spatial identification device 51 is installed in the tractor 1. The spatial identification device 51 is configured to acquire information related to the space around the asphalt roller 100 and to output the acquired information to the controller 50. The spatial identification device 51 in this embodiment includes a front monitoring device 51F, a rear monitoring device 51B, a right-side monitoring device 51R, and a left-side monitoring device 51L.

[0050] The forward monitoring device 51F is configured to monitor the front of the asphalt roller 100. In this embodiment, the forward monitoring device 51F is a LIDAR that defines the monitoring range RF as the space in front of the tractor 1, and is installed at the center of the front end of the upper surface of the tractor 1. Alternatively, the forward monitoring device 51F may also be installed at other parts of the asphalt roller 100.

[0051] The rear monitoring device 51B is configured to monitor the rear of the asphalt tumbler 100. In this embodiment, the rear monitoring device 51B is a LIDAR that defines the monitoring range RB as the space behind the leveler 3, and is mounted on the guide rail 1G, which functions as a handrail for the operator of the asphalt tumbler 100. Alternatively, the rear monitoring device 51B can be mounted on the lower part of the driver's seat 1S, or on other parts of the asphalt tumbler 100.

[0052] The right-side monitoring device 51R is configured to monitor the right side of the asphalt trolley 100. The left-side monitoring device 51L is configured to monitor the left side of the asphalt trolley 100. In this embodiment, the right-side monitoring device 51R and the left-side monitoring device 51L are configured to cover the end of the road surface (the portion that defines the boundary between the road surface and the shoulder) and a side plate 40 located at the outer end of the telescopic leveler 31 as their monitoring range. The right-side monitoring device 51R and the left-side monitoring device 51L are, for example, LIDARs, mounted on a guide rail 1G that functions as a handrail for the operator of the asphalt trolley 100. Furthermore, the right-side monitoring device 51R and the left-side monitoring device 51L can be mounted at any position provided that the aforementioned monitoring range is included to the side of the asphalt trolley 100.

[0053] For example, a LiDAR can measure the distance between itself and more than one million points within its monitoring range. However, at least one of the front monitoring device 51F and the rear monitoring device 51B can be a monocular camera, a stereo camera, a millimeter-wave radar, a lidar, a laser scanner, a distance image camera, or a laser rangefinder, etc. The same applies to the side monitoring device. This embodiment describes an example using a LiDAR as a spatial identification device 51. However, this embodiment does not limit the spatial identification device 51 to a LiDAR. That is, any spatial identification device capable of identifying space based on the asphalt roller 100 is acceptable.

[0054] The monitoring range RF of the forward monitoring device 51F includes the roadbed. The same applies to the monitoring range of the lateral monitoring devices. In this embodiment, the monitoring range RF has a width greater than the width of the roadbed BS.

[0055] The monitoring range RB of the rear monitoring device 51B includes the new paving. In this embodiment, the monitoring range RB has a width greater than the width of the new paving.

[0056] The measurement information detected by the spatial recognition device 51 according to this embodiment is sent to the controller 50. The controller 50 according to this embodiment can automatically steer the asphalt roller 100 according to the received measurement information. Furthermore, the controller 50 can also issue warnings or other notifications to the driver based on the received measurement information.

[0057] Next, refer to Figure 3 The controller 50 mounted on the asphalt roller 100 will be described. Figure 3 This is a block diagram illustrating a structural example of the controller 50 and the devices connected to the controller 50.

[0058] like Figure 3 As shown, the controller 50 is connected to the driving speed sensor 47, the auxiliary storage device 48, the GPS module 54, the front monitoring device 51F, the rear monitoring device 51B, the drive system controller 52, the communication device 53, the leveling machine control device 55, and the leveling machine length detection device 57.

[0059] The travel speed sensor 47 is configured to detect the travel speed of the asphalt roller 100. Figure 3 In the example, the driving speed sensor 47 is an encoder that detects the angular velocity of the rotating shaft of the rear wheel motor that drives the rear wheel 5. Specifically, the driving speed sensor 47 includes a left driving speed sensor and a right driving speed sensor. The left driving speed sensor is an encoder that detects the angular velocity of the rotating shaft of the left rear wheel motor that drives the left rear wheel. The right driving speed sensor is an encoder that detects the angular velocity of the rotating shaft of the right rear wheel motor that drives the right rear wheel. The driving speed sensor 47 can be constructed from a non-contact switch or the like that that detects the slit formed in the rotating plate.

[0060] The auxiliary storage device 48 is configured to store various types of information. Figure 3 In the example, the auxiliary storage device 48 is a non-volatile storage device mounted on the tractor 1, which stores various information. For example, the auxiliary storage device 48 stores a scheduling information storage unit 48a and a vehicle width storage unit 48b.

[0061] The scheduling information storage unit 48a stores scheduling information for the asphalt roller 100 to construct the road surface to be paved. The scheduling information in this embodiment includes, for example, the centerline of the path along which the asphalt roller 100 moves and a target line indicating the end of the road surface to be paved (the portion that forms the boundary between the road surface and the shoulder). The asphalt roller 100 in this embodiment automatically controls the road paving based on the scheduling information.

[0062] The width storage unit 48b stores the length information of the asphalt roller 100 in the width direction, from the structural center position of the asphalt roller 100 (in other words, from the left side to the right side of the asphalt roller 100) to the side.

[0063] Therefore, the controller 50 can calculate the distance from the center position of the asphalt roller 100 in the width direction to the side plate 40 based on the length of the telescopic leveler 31 in the width direction.

[0064] The GPS module 54 is an example of a GNSS (Global Navigation Satellite System) module, receiving location information representing the result of two-dimensional positioning based on GPS (Global Positioning System). The location information includes information representing the position of the asphalt roller 100 in latitude and longitude. Furthermore, while GPS is used as the method for acquiring location information in this embodiment, the method is not limited, and other known methods may also be used.

[0065] The leveling machine length detection device 57 (an example of a detection unit) detects the extension length of the left telescopic leveler 31L and the right telescopic leveler 31R in the vehicle width direction. The leveling machine length detection device 57 can use any sensor as long as it can detect the extension length of the telescopic leveler 31 in the vehicle width direction. The leveling machine length detection device 57 can be a laser sensor or similar device used to detect this length, or it can be a GNSS module installed on the side plate 40. For example, the extension length of the telescopic leveler 31 in the vehicle width direction is calculated based on the distance between the position information detected by the GNSS module and the position information of the GNSS module installed on the main body of the asphalt roller 100. Alternatively, instead of the leveling machine length detection device 57, the controller 50 can determine the length of the telescopic leveler 31 in the vehicle width direction based on the measurement information from the right monitoring device 51R and the left monitoring device 51L.

[0066] The communication device 53 communicates wirelessly with devices located around the asphalt roller 100 or with a server managing the work site. This embodiment may use one or more of the following as the wireless communication protocols for the communication device 53: Wi-Fi (registered trademark), wireless LAN, and Bluetooth (registered trademark).

[0067] The drive system controller 52 controls the tractor 1 according to control commands. For example, the drive system controller 52 performs speed control and rudder angle control of the tractor 1.

[0068] The leveling machine control device 55 is configured to control the extension and retraction of the telescopic leveling machine 31. Figure 3 In the example, the leveling machine control device 55 controls the flow rate of the working oil flowing into the leveling machine telescopic cylinder 27.

[0069] Furthermore, the leveling machine control device 55 performs the following controls according to the control instructions from the controller 50: controlling the left leveling machine telescopic cylinder 27L to retract and shorten the left telescopic leveling machine 31L; and controlling the left leveling machine telescopic cylinder 27L to extend and lengthen the left telescopic leveling machine 31L.

[0070] Furthermore, the leveling machine control device 55 performs the following controls according to the control instructions from the controller 50: controlling the right leveling machine telescopic cylinder 27R to retract and shorten the right telescopic leveling machine 31R; and controlling the right leveling machine telescopic cylinder 27R to extend and lengthen the right telescopic leveling machine 31R.

[0071] In this way, the leveling machine control device 55 controls the length of the right telescopic leveling machine 31R and the left telescopic leveling machine 31L according to the control instructions from the controller 50.

[0072] The controller 50 obtains information from the GPS module 54, the front monitoring device 51F, the rear monitoring device 51B, the right monitoring device 51R, the left monitoring device 51L, the driving speed sensor 47, the leveling machine length detection device 57, and the auxiliary storage device 48. Based on the results of various calculations, it outputs control commands to the leveling machine control device 55 and the drive system controller 52.

[0073] The functional modules within the controller 50 are conceptual and do not necessarily need to be physically configured as shown in the figure. All or part of each functional module can be functionally or physically distributed / integrated in any unit. All or any part of the processing functions performed in each functional module are implemented by a program executed by the CPU. Alternatively, each functional module can be implemented as hardware based on wiring logic. The program executed by the controller 50 according to this embodiment is not limited to being stored in a non-volatile auxiliary storage device; it can be stored in an allocatable storage medium or transmitted and received via communication lines.

[0074] The controller 50 in this embodiment performs self-positioning based on the detection results from the GPS module 54, the forward monitoring device 51F, the rear monitoring device 51B, and the driving speed sensor 47, and performs automatic movement control in order to pave the road surface asphalt as indicated by the scheduling information stored in the auxiliary storage device 48.

[0075] At this time, the controller 50 sends a control command to the leveling machine control device 55 based on the measurement information from the right monitoring device 51R, the left monitoring device 51L and the leveling machine length detection device 57, to extend or shorten the telescopic leveling machine 31, so as to prevent the paving material from overflowing from the road surface of the paving object.

[0076] More specifically, the controller 50 has an acquisition unit 50a, a movement path calculation unit 50b, a movement control unit 50c, and a leveling machine control unit 50d as functional modules composed of software, hardware, or a combination thereof.

[0077] The acquisition unit 50a acquires various types of information. For example, it acquires measurement information from various sensors, such as the front monitoring device 51F, rear monitoring device 51B, right-side monitoring device 51R, and left-side monitoring device 51L. It also acquires measurement information detected by the driving speed sensor 47 (e.g., the speed of the asphalt tumbler 100). Furthermore, it acquires measurement information (the extension lengths of the left telescopic tumbler 31L and right telescopic tumbler 31R in the vehicle width direction) from the screed length detection device 57. Additionally, it acquires location information from the GPS module 54. Furthermore, it acquires information from the auxiliary storage device 48 as needed. It can also acquire steering angle information from the tractor 1.

[0078] The movement path calculation unit 50b calculates the target movement path of the asphalt roller 100 based on the scheduling information read from the scheduling information storage unit 48a. The target movement path, for example, represents information about the path along which the center position of the asphalt roller 100 moves in the width direction (in other words, the width direction between the left and right sides of the asphalt roller 100) in order to enable the asphalt roller 100 to perform road surface construction. Furthermore, the target movement path is not limited to the method of calculation within the controller 50; it can also be received from an external device via the communication device 53. Moreover, the target movement path is not limited to the aforementioned path; it can be any path that the asphalt roller 100 can move along, such as the track of the left front wheel of the tractor 1.

[0079] The movement control unit 50c outputs control commands to the drive system controller 52 based on the measurement information and position information acquired by the acquisition unit 50a, so that the machine moves along the calculated target movement path. This performs automatic movement control of the asphalt roller 100.

[0080] The screed control unit 50d outputs control commands for extending and retracting the telescopic screed 31 to the screed control unit 55 based on measurement information (an example of the detection results) from the right-side monitoring device 51R, the left-side monitoring device 51L, and the screed length detection device 57, corresponding to the width of the road surface on which the paving material is spread. Therefore, since the length of the screed 3 in the vehicle width direction can be made consistent with the width of the road being constructed, the paving material can be appropriately and evenly spread on the road surface.

[0081] Figure 4 This diagram illustrates the structure of the screw SC and the leveling machine 3 in the asphalt roller 100 according to this embodiment. Figure 4This is an example of an asphalt roller 100 traveling in the direction of travel 4001. Furthermore, the screw SC installed on the asphalt roller 100 rotates in direction 4002 according to a control signal from the controller 50. As a result, paving material is pushed out in direction 4003.

[0082] exist Figure 4 In the example, the end of the road surface to be paved (the part that becomes the boundary between the road surface and the shoulder) is set as the target line OL (left target line OLL) of the side plate 40 of the asphalt roller 100.

[0083] Furthermore, when the asphalt roller 100 travels along the direction of travel 4001, if the road surface changes or the rudder angle of the asphalt roller 100 changes, the target line OL, which serves as the boundary between the road surface and the shoulder, will deviate to the right or left, with the center position of the asphalt roller 100 in the vehicle width direction as a reference.

[0084] In this embodiment, the acquisition unit 50a of the controller 50 detects deviations (changes) of the target line OL (e.g., the left target line OLL) based on measurement information from the right monitoring device 51R and the left monitoring device 51L. Furthermore, the leveling machine control unit 50d sends control commands to the leveling machine control device 55 to extend or shorten the telescopic leveling machine 31 based on the detection results, so that the side plate 40 follows the target line (e.g., the left target line OLL).

[0085] Therefore, the side plate 40 can move to the right 4011 or to the left 4012 to follow the target line OL.

[0086] The link assembly 60 will now be described in detail. Furthermore, the relationship between the left fixing plate 43L and the left side plate 40L of the left link assembly 60L will be explained below, but the relationship between the right fixing plate 43R and the right side plate 40R of the right link assembly 60R is the same.

[0087] First, the structure of the connecting rod component 60 and the connection between the side plate 40 and the fixing plate 43 based on the connecting rod component 60 will be explained.

[0088] Figure 5 This is a diagram illustrating the connection between the side plate 40 and the fixing plate 43 of the connecting rod member 60 based on this embodiment, and is a perspective view of the area near the left connecting rod member 60L. Figure 6A This is a diagram showing the left connecting rod assembly 60L mounted on the left side plate 40L from above. Figure 6B This is a side view of the left connecting rod assembly 60L mounted on the left side plate 40L.

[0089] like Figure 5As shown, the left link component 60L (link component 60) has an L-shaped form with two sides 61a and 61b intersecting at right angles, and one of the two sides 61a and 61b, side 61a, is configured to extend along the vehicle width direction (Y-axis direction).

[0090] Two fixing plates 62a and 62b are installed at the front end of the other side 61b, one of the two sides 61a and 61b. For example... Figure 6A As shown, two fixing plates 62a and 62b clamp the side portion 61b with a portion protruding from the front end of the side portion 61b and are mounted to the side portion 61b by welding or the like. Furthermore, with the axial direction of the side portion 61b aligned with the vehicle length direction (X-axis direction), the two fixing plates 62a and 62b are mounted to the side portion 61b in a manner opposite to each other in the vehicle width direction (Y-axis direction). The side portion 61b of the left connecting rod component 60L, thus configured, is mounted to the left side plate 40L.

[0091] A mounting cylinder 63 is installed near the front end edge of the left side panel 40L (side panel 40). The mounting cylinder 63 is an example of a mounting part in this invention. The mounting cylinder 63 has a cylindrical shape and is installed so that it extends axially through the left side panel 40L in the vehicle width direction (Y-axis direction). Figure 5 and Figure 6B As shown, the front edge of the left side panel 40L is inclined. Specifically, the front edge of the left side panel 40L is inclined such that the upper end is further back than the lower end.

[0092] A stop 68 is installed at the front end of one of the two side portions 61a and 61b, side portion 61a. The stop 68 is, for example, plate-shaped and is installed on side portion 61a axially with its plane facing side portion 61a. Side portion 61a of the left connecting rod member 60L thus configured is installed on the left fixed plate 43L.

[0093] The left fixed plate 43L (fixed plate 43) has a fixed plate 64 and a sliding plate 65. The sliding plate 65 can slide in the width direction (Y-axis direction) by means of a sliding mechanism 66 provided on the fixed plate 64. The sliding mechanism 66 can be, for example, a mechanism with rollers. As a result, the width of the left fixed plate 43L (fixed plate 43) in the width direction (Y-axis direction) can be extended or retracted. A retaining hole 67 is provided on the sliding plate 65 at the end on the left side plate 40L side in the width direction (Y-axis direction). The retaining hole 67 is used to retain the left connecting rod member 60L by allowing the edge 61a of the left connecting rod member 60L to pass through. Therefore, the edge 61a of the left connecting rod member 60L has a size that allows it to pass through, for example, it can be an elongated hole that is long in the vertical direction (Z-axis direction). Furthermore, a retaining plate 69a is mounted on the sliding plate 65. The retaining plate 69a is mounted on the sliding plate 65 at a predetermined interval from the retaining hole 67 on the side opposite to the left side plate 40L in the vehicle width direction (Y-axis direction). The retaining plate 69a is mounted to the sliding plate 65 by welding or the like with its plane facing the edge 61a axially. A retaining hole 69b is provided on the retaining plate 69a. The retaining hole 69b is used to retain the left connecting rod member 60L by allowing the edge 61a of the left connecting rod member 60L to pass through. Therefore, the retaining hole 69b is sized to allow the edge 61a of the left connecting rod member 60L to pass through. Furthermore, the stop 68 provided on the edge 61a of the left connecting rod member 60L has a shape that prevents the retaining hole 69b from being inserted.

[0094] The left connecting rod component 60L is installed on the left fixed plate 43L by inserting the side portion 61a through the retaining holes 67 and 69b, and is slidably held in the vehicle width direction (Y-axis direction). At this time, the left connecting rod component 60L is rotatably held on the left fixed plate 43L about the side portion 61a as the rotation axis.

[0095] And, as Figure 6A As shown, the left connecting rod component 60L is mounted to the left side plate 40L by clamping it with two fixing plates 62a and 62b. Therefore, the spacing between the two fixing plates 62a and 62b is wider than the thickness of the left side plate 40L clamped by the fixing plates 62a and 62b. Furthermore, as... Figure 6B As shown, the two fixing plates 62a and 62b are mounted on the side of the mounting cylinder 63 provided on the left side plate 40L. Therefore, the length of the side portion 61b of the left connecting rod component 60L is as follows: with the side portion 61a held on the left fixing plate 43L, the two fixing plates 62a and 62b are mounted on the side of the mounting cylinder 63 and as shown. Figure 6AAs shown, the edge 61a itself does not contact the length of the left side plate 40L. Furthermore, the two fixing plates 62a and 62b can not only be easily installed on the edge 61b by welding or the like, but can also be connected between the ends of the fixing plates 62a and 62b that contact the mounting cylinder 63 via a plate connection. In this case, the plate connecting the fixing plates 62a and 62b is connected to the fixing plates 62a and 62b at a position where they do not contact the left side plate 40L.

[0096] Thus, the left side plate 40L and the left fixed plate 43L are connected via the left connecting rod member 60L. Similarly, the right side plate 40R and the right fixed plate 43R are connected via the right connecting rod member 60R.

[0097] Next, the function of the linkage component 60 will be explained.

[0098] Figure 7 and Figure 8 This is a diagram used to illustrate the function of the connecting rod component 60 according to this embodiment.

[0099] As described above, the side plate 40 is installed at the outer end of the telescopic leveler 31 in the width direction. Specifically, the left side plate 40L is installed at the outer end of the left telescopic leveler 31L in the width direction, and the right side plate 40R is installed at the outer end of the right telescopic leveler 31R in the width direction. Furthermore, as described above, the connecting rod component 60 is installed on the side plate 40 and the fixing plate 43. Specifically, the left connecting rod component 60L is installed on the left side plate 40L and the left fixing plate 43L. And the right connecting rod component 60R is installed on the right side plate 40R and the right fixing plate 43R.

[0100] Thus, the connecting rod assembly 60 connects the telescopic leveling machine 31 to the fixed plate 43. Specifically, as... Figure 7 As shown, the left connecting rod component 60L connects the left telescopic leveler 31L and the left fixed plate 43L. Furthermore, the right connecting rod component 60R connects the right telescopic leveler 31R and the right fixed plate 43R.

[0101] In this state, for example, the left telescopic leveler 31L from Figure 7 The state shown Figure 8 When the width of the leveling machine 3 is extended by the center direction 4013, the left side plate 40L extends towards... Figure 8 The center moves 4014. Here, a left connecting rod component 60L is installed on the left side plate 40L. Moreover, the left connecting rod component 60L is installed on the left side plate 40L by two fixing plates 62a, 62b installed on the edge 61b, which clamp the left side plate 40L against each other in the vehicle width direction (Y-axis direction).

[0102] Furthermore, the left connecting rod component 60L is slidably mounted on the sliding plate 65 of the left fixed plate 43L along the vehicle width direction (Y-axis direction).

[0103] Therefore, when the left side panel 40L is directed towards Figure 8 When the center moves to 4014, the left connecting rod component 60L moves relative to the sliding plate 65 of the left fixed plate 43L. Figure 8 Slide the middle direction to 4014.

[0104] Then, when the stop 68 provided on the edge 61a of the left connecting rod member 60L contacts the retaining plate 69a provided on the sliding plate 65, since the stop 68 is shaped to prevent insertion through the retaining hole 69b provided on the retaining plate 69a, the left connecting rod member 60L cannot move further relative to the sliding plate 65. Figure 8 Slide the middle direction to 4014.

[0105] Thus, the sliding plate 65 can slide relative to the fixed plate 64 along the vehicle width direction (Y-axis direction), thereby being pulled outward (+Y side) in the vehicle width direction (Y-axis direction) by the left connecting rod component 60L. Figure 8 The center slides at 4015. As a result, the width of the left fixed plate 43L in the vehicle width direction (Y-axis direction) is extended.

[0106] Thus, the width of the left fixed plate 43L in the vehicle width direction (Y-axis direction) extends in conjunction with the extension of the width of the left telescopic leveler 31L via the left connecting rod member 60L. Similarly, the width of the right fixed plate 43R in the vehicle width direction (Y-axis direction) extends in conjunction with the extension of the width of the right telescopic leveler 31R via the right connecting rod member 60R. Furthermore, when the stop 68 provided on the edge 61a of the left connecting rod member 60L contacts the retaining plate 69a of the sliding plate 65, it can be configured such that the left connecting rod member 60L cannot extend relative to the sliding plate 65. Figure 8 A stop block that slides in the opposite direction to the center direction 4014. This allows the width of the left fixed plate 43L in the vehicle width direction (Y-axis direction) to be shortened in conjunction with the width shortening of the left telescopic leveler 31L via the left connecting rod member 60L. Furthermore, the right connecting rod member 60R can also adopt the same structure.

[0107] In this way, the width of the left fixed plate 43L in the vehicle width direction (Y-axis direction) can be extended or retracted in conjunction with the extension or retraction of the width of the left telescopic leveler 31L via the left connecting rod member 60L. Similarly, the width of the right fixed plate 43R in the vehicle width direction (Y-axis direction) can be extended or retracted in conjunction with the extension or retraction of the width of the right telescopic leveler 31R via the right connecting rod member 60R.

[0108] Thus, in this embodiment, the fixing plate 43 is configured such that its width in the vehicle width direction can be extended or retracted in conjunction with the width extension or retraction of the telescopic leveler 31 in the vehicle width direction via the linkage member 60. This allows for the expansion of the width of the fixing plate 43 with a simple structure.

[0109] Furthermore, in this embodiment, the telescopic leveling machine 31 and the fixed plate 43 are connected by mounting the connecting rod component 60 to the side plate 40 and the fixed plate 43. Thus, the telescopic leveling machine 31 and the fixed plate 43 can be connected with a simple structure.

[0110] Furthermore, in this embodiment, when the width of the telescopic leveler 31 in the vehicle width direction is extended, the fixed plate 43 is pulled outward in the vehicle width direction by the connecting rod member 60, thereby extending its width in the vehicle width direction. Thus, the telescopic leveler 31 and the fixed plate 43 can be connected with a simple structure.

[0111] Next, the method for storing the connecting rod component 60 will be explained.

[0112] Figure 9 and Figure 10 This is a diagram illustrating the method of storing the connecting rod component 60 according to this embodiment.

[0113] As described above, the left connecting rod component 60L is rotatably held on the left fixed plate 43L with the side portion 61a as the axis of rotation. Furthermore, with the left connecting rod component 60L mounted on the left side plate 40L, the two fixed plates 62a and 62b provided on the side portion 61a are placed on the side of the mounting cylinder 63 in a manner that clamps the left side plate 40L.

[0114] Therefore, as Figure 9 As shown, the left connecting rod assembly 60L can rotate about the edge 61a as the axis of rotation. Figure 9 Rotate the center direction 4016. This allows the left side plate 40L to be positioned so that it is not clamped by the two fixed plates 62a and 62b. Thus, by rotating the left connecting rod member 60L about its edge 61a as an axis of rotation... Figure 9 A simple operation like rotating the center 4016 allows the left connecting rod assembly 60L to be disassembled from the left side plate 40L.

[0115] Thus, in this embodiment, the connecting rod component 60 is detachably mounted to the side plate 40. Therefore, depending on the needs of the operation, the width of the fixed plate 43 can be made independent of the width of the telescopic leveler 31.

[0116] Furthermore, as described above, the left connecting rod component 60L is installed on the left fixing plate 43L by inserting the side portion 61a through the retaining holes 67 and 69b, and is slidably retained in the vehicle width direction (Y-axis direction).

[0117] Therefore, as Figure 10 As shown, the left connecting rod component 60L is as follows: Figure 9 As shown, after being removed from the left side plate 40L, the left connecting rod assembly 60L can be moved along... Figure 10 The center slides at 4017. Additionally, at this time, as described above, when the left connecting rod member 60L is positioned such that it cannot move relative to the sliding plate 65... Figure 8 If the stop block slides in the opposite direction to the center direction 4014, perform operations such as disassembling the stop block.

[0118] In this way, the left connecting rod component 60L can be housed in the left fixed plate 43L. Thus, in this embodiment, the connecting rod component 60 can be housed in the fixed plate 43. Therefore, for example, when the extension screw SC or something similar enters the rear side of the fixed plate 43 for operation, the connecting rod component 60 can be prevented from becoming an obstacle.

[0119] Alternatively, the connecting rod 60 can be folded and stored in the mounting plate 43, instead of sliding. However, if the connecting rod 60 can be slid inward in the vehicle width direction (Y-axis direction) and stored in the mounting plate 43, the working space when storing the connecting rod 60 in the mounting plate 43 can be reduced.

[0120] Furthermore, in this embodiment, the connecting rod component 60 is L-shaped, with one side of the L-shape slidably mounted to the fixing plate 43 and the other side of the L-shape detachably mounted to the side plate 40. Thus, the connecting rod component 60 can be easily constructed based on the interval between the fixing plate 43 and the side plate 40 in the vehicle width direction (Y-axis direction) and the interval between the fixing plate 43 and the side plate 40 in the vehicle length direction (X-axis direction).

[0121] Alternatively, when installing the connecting rod component 60 housed in the fixing plate 43 onto the side plate 40, the operation can be reversed as described above.

[0122] Specifically, first, the connecting rod assembly 60 is slid along the vehicle width direction (Y-axis direction) and pulled out from the fixing plate 43. Then, the connecting rod assembly 60 is rotated about the edge 61a as the rotation axis, and the two fixing plates 62a and 62b are placed on the mounting cylinder 63 from above, so that the side plate 40 is clamped by the two fixing plates 62a and 62b.

[0123] Therefore, the connecting rod component 60 housed in the fixed plate 43 can be installed on the side plate 40.

[0124] Next, the function of the leveling machine 3 when its height or inclination changes will be explained.

[0125] As described above, in the asphalt roller 100 of this embodiment, the leveling machine 3 moves up and down together with the leveling arm 3A by extending and retracting the leveling machine lifting cylinder 25. Furthermore, the tilt angle of the leveling machine 3 may sometimes change due to the extension and retraction of the leveling cylinder 23.

[0126] Figure 11 and Figure 12 This diagram illustrates the effect of a change in the height of the leveling machine 3.

[0127] When the left connecting rod component 60L is installed on the left side plate 40L, the left side plate 40L is held by the two fixing plates 62a and 62b, as... Figure 11 As shown, the two fixing plates 62a and 62b are placed on the side of the mounting cylinder 63 set on the left side plate 40L.

[0128] Furthermore, the left connecting rod component 60L is rotatably held on the left fixed plate 43L with the side portion 61a as the axis of rotation.

[0129] Here, with the left connecting rod component 60L mounted on the left side plate 40L, the side of the mounting cylinder 63, which holds the two fixing plates 62a and 62b, becomes a cylindrical surface. Therefore, as the height of the leveling machine 3 increases, the left side plate 40L moves towards... Figure 12 When the left connecting rod component 60L moves in the direction of the middle arrow 4021, if the left connecting rod component 60L can rotate about the side 61a as the axis of rotation, then the two fixed plates 62a and 62b can move while changing the contact portion with the side of the mounting cylinder 63.

[0130] Therefore, as the height of the leveling machine 3 increases, the left side plate 40L moves towards... Figure 12 When the left connecting rod component 60L moves in the direction of the middle arrow 4021, it rotates about the side 61a as its axis of rotation. The two fixed plates 62a and 62b can move simultaneously on the side of the mounting cylinder 63, changing their contact points with the side. At this time, the left connecting rod component 60L rotates about the side 61a as its axis of rotation, and the two fixed plates 62a and 62b move simultaneously on the side of the mounting cylinder 63, changing their contact points with the side. Therefore, the left fixed plate 43L will not move along the same path as the left side plate 40L. Figure 12 Move in the direction of the middle arrow 4021.

[0131] Furthermore, even when the height of the leveling machine 3 decreases, the left connecting rod component 60L still rotates around the edge 61a as the axis of rotation, and the left fixed plate 43L does not move in the same direction as the left side plate 40L.

[0132] Furthermore, even if the tilt of the leveling machine 3 changes, the left connecting rod component 60L will still rotate around the edge 61a as the rotation axis, and the height of the left fixed plate 43L will not change.

[0133] Thus, in this embodiment, the sides of the two fixing plates 62a and 62b that mount the connecting rod member 60 in the mounting cylinder 63, one example of which is the mounting portion for mounting the connecting rod member 60, are cylindrical. Therefore, the mounting cylinder 63 has a structure that holds the left connecting rod member 60L in a position to rotate about its edge 61a. By employing this structure, even if the height or inclination of the leveling machine 3 changes, changes in the height of the left side plate 40L can be avoided.

[0134] Furthermore, according to the asphalt roller 100, some models can also set the height of the leveler 3 so that the central part in the vehicle width direction (Y-axis direction) is high and the two ends in the vehicle width direction (Y-axis direction) are low. This is to create some hill-like slopes on the road surface so that water can easily flow to both sides of the road during events such as rainfall. Thus, when the height of the leveler 3 is set, the side plate 40, which is held between the two fixing plates 62a and 62b, is inclined relative to the two fixing plates 62a and 62b instead of being parallel.

[0135] Therefore, the spacing between the two fixing plates 62a and 62b can be widened to allow for a certain margin of thickness relative to the side plate 40 held by the fixing plates 62a and 62b. Alternatively, the two fixing plates 62a and 62b can be welded to the edge 61b via spacers. Furthermore, the ends of the two fixing plates 62a and 62b that contact the mounting cylinder 63 can be connected by plates. Thus, even if the side plate 40 is inclined relative to the two fixing plates 62a and 62b, the side plate 40 can still be held by the two fixing plates 62a and 62b.

[0136] The embodiments have been described in detail above, but the present invention is not limited to the specific embodiments involved, and various modifications / changes can be made within the scope of the spirit described in the technical solution.

Claims

1. An asphalt rolling machine, comprising: Traction machine; The screw is used to lay paving material on the rear side of the traction machine; The leveling machine compacts the paving material on the rear side of the screw; A fixing plate is disposed on the front side of the screw; and The connecting component connects the leveling machine to the fixing plate. The leveling mechanism allows for expansion and contraction of its width in the vehicle width direction. The fixing plate is configured such that its width in the vehicle width direction can be extended or retracted in conjunction with the width of the leveling machine in the vehicle width direction via the connecting component.

2. The asphalt roller according to claim 1, comprising: Side plates are installed at the outer end of the leveler in the width direction. The connecting component connects the leveling machine to the fixed plate by being mounted on the side plate and the fixed plate.

3. The asphalt roller according to claim 2, wherein, When the width of the leveling machine extends in the vehicle width direction, the fixing plate is pulled outward in the vehicle width direction by the connecting member, thereby extending the width in the vehicle width direction.

4. The asphalt roller according to claim 3, wherein, The connecting component is detachably mounted on the side plate.

5. The asphalt roller according to claim 4, wherein, The connecting component can be housed in the fixing plate.

6. The asphalt roller according to claim 5, wherein, The connecting component can be housed in the fixing plate by sliding inward in the vehicle width direction.

7. The asphalt roller according to claim 6, wherein, The connecting component is L-shaped, with one side of the L-shape slidably mounted to the fixing plate and the other side of the L-shape detachably mounted to the side plate.

8. The asphalt roller according to claim 7, wherein, The side plate has a mounting portion for mounting the connecting component. The mounting portion has a structure that holds the connecting member so that it can rotate about one of the sides as a rotation axis.

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