JP2021127560A - Road paving machine - Google Patents

Abstract

To provide a road paving machine capable of performing paving work so as not to be a burden on an operator when changing a paving width.SOLUTION: A road paving machine 1 is equipped with screeds 9a, 9b, bar feeders 2a, 2b, screws 3a, 3b, expansion/contraction amount detecting means for detecting the expansion and contraction amount of the screeds 9a, 9b, and a controller 13 for controlling a conveyance amount of a mixture by the bar feeders and the screws according to the expansion/contraction amount. When the screed is expanded, the controller 13 increases the speeds of the bar feeders and the screws to add the mixture (S204, 205), and then operates the bar feeders and the screws at a conveyance amount corresponding to the expansion width (S207). When the screed is reduced, the controller 13 stops or decelerates the bar feeders and the screws to adjust the amount of the composite material (S304, 305), and then operates the bar feeders and the screws at the conveyance amount corresponding to the reduction width (S307).SELECTED DRAWING: Figure 5

Description

The present invention relates to a road paving machine, and more specifically, to a road paving machine characterized by controlling the amount of a mixture transported in the road paving machine having a telescopic screed.

In the road paving work by a road paving machine called an asphalt finisher, generally, as described in FIG. 1 of Patent Document 1, the asphalt mixture received by the hopper is used on the screw side by a bar feeder (also called a bar conveyor). The pavement is formed by laying out the mixture on the road surface with the screed device at the rear while the main body is traveling.

In the operation of road pavement machines, it is important to keep the pavement thickness constant. In order to keep the pavement thickness constant, it is necessary to keep the amount of asphalt mixture held between the bar feeder and the screw constant. If the amount of pavement held is small, the pavement thickness will be thin. If the amount of holding is large, the pavement thickness may become thick. Therefore, it becomes impossible to construct a pavement in which the pavement thickness is kept constant.

Further, for example, in the case of a small road pavement machine capable of paving in a narrow place, the pavement width can be widened or narrowed by changing the width of the screed device. Such a screed device is well known as a device having a telescopic screed.

Jikkenhei 4-92008 Gazette Jikkenhei No. 3-36013 Jikken Sho 62-5047 Gazette Special Publication No. 62-21925

In the case of a road paving machine having a telescopic screed, it is necessary to adjust the holding amount according to the amount of expansion and contraction. For example, if you want to widen the pavement width during pavement, you must maintain an appropriate amount of pavement so that the pavement thickness does not become thin. Therefore, conventionally, when widening the pavement width, the operator increases the rotation speed of the bar feeder to convey a large amount of asphalt mixture to the screw side, and further accelerates the rotation of the screw to include a screed device including a telescopic screed. The construction width was manually controlled so that the asphalt mixture would not run short.

Such control largely relies on the experience of the operator, and if the telescopic screed is widened but the amount of holding is small or the screw rotation is slow, it will reach the end of the widened telescopic screed. The asphalt mixture does not reach and the edges cannot be paved, or the thickness is insufficient.

Therefore, the present invention provides a road pavement machine having a telescopic screed, which enables the pavement work to be performed by automatic control as much as possible when changing the pavement width so as not to burden the operator. It is intended to be provided.

In addition, Patent Documents 1 to 4 will be described in comparison as follows.

The asphalt finisher described in Patent Document 1 is provided with a pavement width sensor, but does not describe at all the concept of automatically controlling the feed amount of the mixture when the pavement width is changed.

The asphalt finisher described in Patent Document 2 can control the asphalt mixture transport amount by the feeder according to the input pavement width and thickness, and can change the asphalt mixture transport amount in proportion to the vehicle speed. However, at the actual construction site, the operator fine-tunes the width of the telescopic screed while observing the width of the road to be constructed. Therefore, the asphalt described in Patent Document 2 that controls the amount of asphalt mixture transported according to the numerically input pavement width is essentially different from the present invention.

The asphalt finishers of Patent Documents 3 and 4 are provided with a screed expansion / contraction amount detection unit to adjust the opening / closing amount of the feeder gate to adjust the amount of asphalt mixture. No disclosure is made regarding the adjustment of the screw rotation speed and the control method after the judgment work.

In order to solve the above problems, the present invention has the following features. The present invention is a road paving machine including a stretchable screed, a bar feeder for transporting a mixture, and a screw for diffusing the mixture, and is a means for detecting the amount of expansion and contraction of the screed. The controller includes a controller that controls the amount of the mixture conveyed by the bar feeder and the screw according to the amount of expansion and contraction detected by the expansion and contraction amount detecting means.

When the screed is expanded, the controller accelerates the bar feeder and the screw to add a mixture, and then operates the bar feeder and the screw with a transfer amount according to the expansion width.

When the screed is reduced, the controller stops or decelerates the bar feeder and the screw to adjust the amount of the mixture, and then operates the bar feeder and the screw with a transport amount according to the reduced width.

When the screed expands, the controller calculates the amount of mix that is missing due to the expansion and accelerates the bar feeder and screw until the missing mix is replenished.

The controller calculates the amount of mix material that is missing based on the expansion width and the holding dimensions in front of the screed.

When the screed is expanded, the controller calculates the transfer amount according to the expansion width and operates the bar feeder and the screw based on the calculated transfer amount.

The controller calculates the transport amount according to the expansion width based on the construction width, the pavement thickness, and the construction speed.

When the screed shrinks, the controller calculates the amount of excess mix that results from shrinking and stops or decelerates the bar feeder and screw until the excess mix is used.

The controller calculates the amount of excess mixture based on the reduction width and the holding dimension in front of the screed.

When the screed is reduced, the controller calculates the transfer amount according to the reduction width and operates the bar feeder and the screw based on the calculated transfer amount.

The controller calculates the transport amount according to the reduction width based on the construction width, the pavement thickness, and the construction speed.

The controller stores information about the initial construction state and sets the bar feeder and screed based on when the screed expands or contracts, for example, at what percentage of the initial construction state it should be accelerated or decelerated. Control. In addition, for example, the controller may control the rotation speed of the bar feeder and / or the screed by providing a means for detecting the rotation speed of the bar feeder and / or the screed, a rotation speed control circuit, and the like.

When the screed expands, the controller accelerates the bar feeder and screw to fill the missing mix within the engine's tolerance.

The screed is a two-row type that can be expanded and contracted to the left and right, the bar feeder is present on the left and right, and the transport amount can be controlled separately on the left and right. When it is possible to control the right and / or left transfer amount of the bar feeder, and the right and / or left transfer of the screw, the controller depends on the amount of expansion and contraction of the right and / or left of the screed. Control the amount.

If the screed is a one-row type that can be expanded and contracted to the left and right, the bar feeder cannot be controlled separately for the left and right, and the screws are present on the left and right and it is possible to control the transfer amount separately for the left and right, the controller , The transfer amount of the bar feeder and the transfer amount of the right and / or left of the screw are controlled according to the expansion and contraction amount of the right and / or left of the screed.

The operator can input a correction value for the transfer amount of the bar feeder and / or the screw, and the controller adjusts the transfer amount of the bar feeder and / or the screw based on the correction value input by the operator.

The expansion / contraction amount detecting means detects the expansion / contraction amount of the screed based on the operation time of the expansion / contraction cylinder.

The expansion / contraction amount detecting means detects the expansion / contraction amount of the screed based on the sensor attached to the expansion / contraction cylinder or the screed.

According to the present invention, when the screed is expanded, the controller accelerates the bar feeder and the screw to add a mixture, and then operates the bar feeder and the screw at a transfer amount according to the expansion width, and the screed operates. When the bar feeder and screw are reduced, the bar feeder and screw are stopped or decelerated to adjust the amount of mixture, and then the bar feeder and screw are operated with the amount of transport according to the reduced width. When changing the pavement width, the pavement work can be performed by automatic control as much as possible so as not to burden the operator.

Expansion of the screed calculates the amount of missing mix, and speeding up the bar feeder and screw or shrinking the screed calculates the amount of excess mix until the missing mix is replenished. By stopping or decelerating the bar feeder and screw until the excess mixture is used, the amount of transport can be automatically adjusted in response to changes in the pavement width, reducing the burden on the operator. ..

If the amount of the insufficient mixture or the amount of the excess mixture is calculated based on the expansion width or the reduction width and the holding dimension in front of the screed, control by a simple calculation can be realized.

If the transport amount according to the expansion width or the reduction width is calculated based on the construction width, the pavement thickness, and the construction speed, the control by a simple calculation can be realized.

The control of the bar feeder and the screed becomes easy by the controller deciding what percentage of the speed is increased or, in principle, the bar feeder and the screed should be controlled as compared with the initial construction state. In a hydraulic circuit, such control is suitable, but not limited to. Further, by providing a means for detecting the rotation speed of the bar feeder and / or the screed, a rotation speed control circuit, and the like, it is possible to accurately control those rotation speeds.

By increasing the speed of the bar feeder and screw within the allowable range of the engine where the mixture is insufficient, the mixture can be supplied as soon as possible, so that the pavement thickness is as accurate as possible. Can be constructed.

The present invention realizes control corresponding to the 1-row type and 2-row type bar feeders, and is versatile.

If the operation time of the expansion / contraction cylinder is used as the expansion / contraction amount detecting means, it is not necessary to newly install a sensor, so that the cost can be suppressed.

If a sensor attached to the expansion / contraction cylinder or the screed is used as the expansion / contraction amount detecting means, the expansion / contraction amount of the screed can be accurately detected.

These and other objectives, features, aspects and effects of the present invention will become more apparent from the following detailed description in light of the accompanying drawings.

FIG. 1 is a schematic side view of a road paving machine 1 according to an embodiment of the present invention. FIG. 2 is a schematic plan view of the road paving machine 1 according to the embodiment of the present invention. FIG. 3 is a schematic system diagram showing a functional configuration of the road paving machine 1 according to the embodiment of the present invention. FIG. 4 is a flowchart showing a process of grasping the initial construction state executed by the controller 13 of the road pavement machine 1 according to the embodiment of the present invention. FIG. 5 is a flowchart showing a process at the time of operating the screed telescopic switch executed in the controller 13 of the road pavement machine 1 according to the embodiment of the present invention.

Hereinafter, the schematic structure, operation, and control method of the road pavement machine 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIGS. 1 to 3, the road paving machine 1 includes a right bar feeder 2a, a left bar feeder 2b, a hydraulic motor 7a for the right bar feeder 2a, a hydraulic motor 7b for the left bar feeder 2b, and the like. Right screw 3a, left screw 3b, hydraulic motor 8a for right screw 3a, hydraulic motor 8b for left screw 3b, main screed 4, right rear wheel 5a, left rear wheel 5b, right rear wheel Hydraulic motor 6a for 5a, hydraulic motor 6b for left rear wheel 5b, right telescopic screed 9a, left telescopic screed 9b, hydraulic cylinder 10a for right telescopic screed 9a, hydraulic cylinder for left telescopic screed 9b For 10b, engine 11, hydraulic pump 12, controller 13, operation panel 14, traveling lever 15, hydraulic electromagnetic proportional valve and hydraulic electromagnetic valve 16, right hopper 19a, left hopper 19b, right hopper 19a. Hydraulic cylinder 16a, hydraulic cylinder 16b for left hopper 19b, right front wheel 17a, left front wheel 17b, main step 18, right step 18a, left step 18b, handle 19, right leveling arm 20a. The left leveling arm 20b, the hydraulic cylinder 21a for the right leveling arm 20a, and the hydraulic cylinder 21b for the left leveling arm 20b are provided. The hydraulic solenoid proportional valve and the hydraulic solenoid valve 16 may be an integrated type or a separate type.

Each hydraulic motor and hydraulic cylinder is rotated or operated by the high-pressure oil discharged from the hydraulic pump 12 connected to the engine 11. Then, the flow rate of the high-pressure oil is adjusted by controlling the hydraulic solenoid valve and the hydraulic solenoid valve 16 by a command (output signal) from the controller 13. As a result, the rotation speed of each hydraulic motor and the amount of expansion and contraction of the hydraulic cylinder are adjusted. Here, the road pavement machine 1 is premised on being driven by flood control, but may be driven by electric power or may be driven by a combination of hydraulic and electric power. Further, the present invention is not limited to the wheel type road paving machine, and may be a crawler type road paving machine.

Here, just in case, the operation of the road pavement machine 1 will be roughly described. The asphalt mixture (hereinafter, simply referred to as "mixture") is housed in the hopper formed by the right hopper 19a and the left hopper 19b. The inclinations of the left and right hoppers 19a and 19b can be adjusted by the hydraulic cylinders 16a and 16b. For example, as the amount of mixture decreases, the inclination angles of the left and right hoppers 19a and 19b are adjusted to increase. Then, the mixture is dropped on the left and right bar feeders 2a and 2b.

The rotation speeds of the left and right bar feeders 2a and 2b can be adjusted by the hydraulic motors 7a and 7b, respectively. The bar feeders 2a and 2b are provided below the hoppers 19a and 19b, and convey the mixture housed in the hoppers to the front of the left and right screws 3a and 3b.

The left and right screws 3a and 3b are spirally configured, for example, so as to be rotated by the hydraulic motors 8a and 8b and diffuse the mixture from the bar feeders 2a and 2b to the left and right, respectively. The shape is not limited.

For example, when the right telescopic screed 9a is extended, it is necessary to feed the mixture to the right side, so increase the rotation speed of the right bar feeder 2a and further increase the rotation speed of the right screw 3a to increase the rotation speed of the right telescopic screed. The mixture will be sent to the 9a side.

The operation panel 14 is provided with a switch or a volume for operating the rotation speeds of the left and right bar feeders 2a and 2b, the rotation speeds of the left and right screws 3a and 3b, and the expansion and contraction widths of the left and right expansion and contraction screeds 9a and 9b. ..

The traveling lever 15 is used for switching between forward and reverse. Further, the traveling lever 15 exists to adjust the rotational speeds of the hydraulic motors 6a and 6b of the left and right rear wheels 5a and 5b, and is used to adjust the traveling speed of the road paving machine 1.

By adjusting the left and right leveling arms 20a and 20b by the left and right hydraulic cylinders 21a and 21b, the upward angles of the main screed 4 and the left and right telescopic screeds 9a and 9b are adjusted, and the pavement thickness is adjusted. NS.

The operator operates the operation panel 14, the traveling lever 15, and the handle 19 while riding on the main step 18 and the left and right right steps 18a and 18b to move the main screed 4 and the left and right telescopic screeds 9a and 9b to the front or the lower part. While checking the amount of existing mixture, always be aware that the pavement is being constructed with the appropriate amount of mixture, and while checking whether the pavement has the appropriate thickness, use the traveling lever 15 to use the road. Construction is being carried out while advancing the pavement machine 1.

Next, a control method by the controller 13 peculiar to the road pavement machine 1 according to the embodiment of the present invention will be described.

As shown in FIG. 4, when the construction is started, the operator inputs the pavement thickness on the operation panel 14 (S10), and adjusts the expansion / contraction width with the expansion / contraction operation switch (SW) of the screed 9a and / or 9b (S20). ), Adjust the feed amount of the mixture with the operation switch of the bar feeder 2a and / or 2b (S30), adjust the diffusion amount of the mixture with the operation switch of the screw 3a and / or 3b (S40), and adjust the traveling lever 15 Then, the traveling speed of the road pavement machine 1 is adjusted (S50). The operations up to this point are basically manual operations based on the operator's experience and instructions at the time of construction.

The controller 13 measures the operation time of the expansion / contraction operation switch of the screed 9a and / or 9b (S21). The longer the operation time, the longer the pavement width. The controller 13 recognizes in advance the length of the pavement width according to the operation time by a storage table or a calculation formula, and calculates the pavement width according to the operation time (S22). Here, the pavement width is calculated according to the operation time, but the controller 13 expands and contracts the telescopic screed 9a and / or 9b, or the left and right cylinders 10a and / or 10b by using various sensors. The amount may be calculated to determine the pavement width.

The screeds 9a and / or 9b may be stretched on only one side or on both sides with the same length or different lengths. In order to correspond to such various expansion / contraction widths, the controller 13 calculates how much the left and right screeds have expanded / contracted. For example, when the right telescopic screed 9a is extended by 10 cm and the left telescopic screed 9b is extended by 5 cm, it is recognized that the pavement width is further extended by 10 cm to the right and 5 cm to the left with respect to the pavement width of the main screed 4. There is a need. The controller 13 needs to adjust the rotation speeds of the left and right screws 3a and / or 3b according to the amount of expansion and contraction of the left and right pavement widths.

Further, here, the right bar feeder 2a and the left bar feeder 2b can be used to separately control the rotation speeds of the left and right bar feeders 2a and / or 2b. Therefore, the controller 13 also needs to adjust the rotation speeds of the bar feeders 2a and / or 2b according to the amount of expansion and contraction of the left and right pavement widths.

The rotation speed or rotation speed of the bar feeder and the screw may be expressed as a transport amount.

At the beginning of construction, the operator adjusts the rotational speed of the bar feeder 2a and / or 2b until the desired pavement thickness is reached. Once the desired pavement thickness is reached, the operator stabilizes the rotational speed of the bar feeders 2a and / or 2b. The controller 13 recognizes that the rotation speeds of the bar feeders 2a and / or 2b are stable, and measures the rotation speeds of the bar feeders 2a and / or 2b at the time of stabilization (S31). Then, the cotroller 13 calculates the amount of the mixture to be conveyed according to the rotation speeds of the bar feeders 2a and / or 2b (S32). The controller 13 may determine whether or not the rotation speeds of the bar feeders 2a and / or 2b are stable based on whether or not the rotation speeds are within a certain range for a predetermined time, but other automatic control may also be used. Further, the on / off switch may be provided so that the operator manually instructs the stability of the rotation speed, and the present invention is not limited to these.

There are two types of bar feeders, a two-row type and a one-line type. In the case of the two-row type, the rotation speeds of the left and right bar feeders can be adjusted individually. In the case of the one-row type, there is no difference in rotation speed between the left and right. In the present embodiment, the case of the two-article type will be described, but the case of the one-article type will also be supplementarily explained as appropriate. Here, in the case of the one-row type, the controller 13 may detect whether or not the rotation speed of one bar feeder integrated on the left and right is stable.

That is, when the two-row type bar feeder is used in the initial construction state grasping process, the controller 13 calculates and stores the rotation speeds of the left and right bar feeders 2a and 2b. When a single-row bar feeder is used, the controller 13 calculates and stores the rotation speed of the single-row bar feeder.

At the beginning of construction, the operator adjusts the rotational speed of the screws 3a and / or 3b until the desired pavement thickness is reached. Once the desired pavement thickness is reached, the operator stabilizes the rotational speed of the screws 3a and / or 3b. The controller 13 recognizes that the rotation speeds of the screws 3a and / or 3b are stable, and measures the rotation speeds of the screws 3a and / or 3b when the screws 3a and / or 3b are stable (S41). Then, the cotroller 13 calculates the number of rotations according to the rotation speeds of the screws 3a and / or 3b (S42). The controller 13 may determine whether or not the rotation speeds of the screws 3a and / or 3b are stable based on whether or not the rotation speeds are within a certain range for a predetermined time, but the present invention is not limited to this.

At the beginning of construction, the operator operates the hydraulic cylinder 21a for the right leveling arm 20a and the hydraulic cylinder 21b for the left leveling arm 20b until the desired pavement thickness is reached, and adjusts the traveling lever 15 as appropriate. Once the desired pavement thickness is reached, the operator stabilizes the travel lever 15. The controller 13 recognizes that the traveling speed of the traveling lever 15 has become stable, and measures the traveling speed at the time of stabilization (S51). Then, the cotroller 13 calculates the traveling speed (S52). The controller 13 may determine whether or not the traveling speed is stable based on whether or not the traveling speed is within a certain range for a predetermined time, but the present invention is not limited to this.

By the above operation, the pavement thickness (also referred to as construction thickness), pavement width (also referred to as construction width), bar feeder transport amount, screw rotation speed (conveyance amount), and running speed are obtained as the initial construction state. The controller 13 stores this information (S60).

Here, the information regarding the initial construction state stored in the controller 13 is summarized.
<In the case of a two-row bar feeder>
Pavement thickness, overall pavement width, expansion / contraction amount of right telescopic screed 9a, expansion / contraction amount of left telescopic screed 9b, rotation speed of right bar feeder 2a, rotation speed of left bar feeder 2b, rotation speed of right screw 3a, left screw 3b Rotation speed, running speed <In the case of 1-row bar feeder>
Pavement thickness, overall pavement width, expansion / contraction amount of right telescopic screed 9a, expansion / contraction amount of left telescopic screed 9b, rotation speed of bar feeder, rotation speed of right screw 3a, rotation speed of left screw 3b, running speed

The rotation speed of each bar feeder and the rotation speed of each screw can be replaced with the transfer amount. In the present invention, the transfer amount refers to the actual transfer amount of the mixture per unit time. , Refers to the rotation speed.

Here, the numerical values calculated and stored by the controller 13 as the initial construction state are merely examples, and the numerical values specifically calculated and stored are not limited to this. The information indicating the state at the time of initial construction is not limited to the above-mentioned information.

The processing when the switches of the telescopic screed 9a and / or 9b are operated will be described with reference to FIG. Again, it is assumed that the telescopic screeds 9a and / or 9b may both be operated or only one may be operated. Further, it is also assumed that the lengths of the telescopic screeds 9a and / or 9b may be different from each other.

To give a schematic description of the operation of FIG. 5, the insufficient amount of mixed material and the excess amount of mixed material are calculated based on how much the pavement width is increased or decreased, and the bar feeder 2a and the bar feeder 2a and the corresponding amount are calculated accordingly. By increasing, decreasing, or stopping the / or 2b and the screws 3a and / or 3b, the mixture is automatically supplied to the screed device side in response to the increase or decrease in the pavement width.

First, when the switch of the telescopic screed 9a and / or 9b is operated (S101), in the case of the two-row type, the controller 13 has the left and right screeds based on the switch operation direction of the telescopic screed 9a and / or 9b. It is determined whether it has been expanded or contracted (S102).

In the case of the one-row type, the controller 13 recognizes the expansion / contraction width of each of the left and right screeds after operating the switches of the expansion / contraction screeds 9a and / or 9b, and determines whether the entire pavement width has expanded or decreased. (S102). After the judgment, as will be described later, in the case of the one-row type as well, the transport amount of the left and right screws is controlled in the same manner as in the two-row type.

In the case of the two-row type, for each of the telescopic screeds 9a and / or 9b, the expansion and contraction screed side proceeds to the operation of S201, and the contraction and contraction screed side proceeds to the operation of S301. move on. The operation of the telescopic screed that has not changed will be described as appropriate.

In the case of the one-row type, if the total pavement width is increasing, the operation proceeds to S201, and if the total pavement width is decreasing, the operation proceeds to S301. In the case of the Article 1 formula, the operations that cannot be completely written in the flowchart shown in FIG. 5 shall be described as appropriate.

First, the operation in the case of the two-row type will be described, and then the operation in the case of the one-row type will be described.

In the case of the two-row type, in S201, the controller 13 measures the operation time of the switch of the extended telescopic screed 9a and / or 9b. Then, the controller 13 calculates the total pavement width, the extension amount (extended amount) of the right expansion / contraction screed 9a, and / or the extension amount of the left expansion / contraction screed 9b based on the operation time (S202).

The above control based on the operation time by the controller 13 is based on the premise that the absolute positional relationship between the telescopic screeds 9a and 9b is not grasped by the sensor, but the screeds 9a and 9b or the hydraulic cylinder 10a and If the sensor attached to the 10b can grasp the absolute positional relationship, the above calculation based on the operation time can be omitted, and the controller 13 can use the controller 13 based on the absolute positional relationship of the telescopic screeds 9a and 9b. The amount of expansion and contraction can be recognized. Therefore, the operation of S201 and S202 can be replaced with the detection of the expansion / contraction amount using the sensor.

That is, the road pavement machine 1 of the embodiment according to the present invention includes means for detecting the amount of expansion and contraction of the screed after the change according to the expansion and contraction operation of the screed. The change in the amount of expansion and contraction of the screed can also be regarded as the change in the pavement width.

As described above, on the premise that the screed extension operation has been performed, the controller 13 proceeds to the operation of S203.

In S203, the controller 13 calculates the amount of mixed material that is insufficient due to the increase in the pavement width. Various calculation methods can be considered, but here, an example will be introduced.

The controller 13 calculates the amount of mixture required per unit time (for example, 1 minute) in the initial construction state. The controller 13 calculates the amount of additional mixture required due to the increased pavement width.

For example, suppose that the initial construction state is a pavement width of 3 m, a pavement thickness of 5 cm, and a traveling speed of 3 m / min. The dimensions assumed in the screed device of the road paving machine 1 are that the width of the main screed 4 is 1.5 m, the maximum expansion / contraction amount of the right telescopic screed 9a is 1.25 m, and the maximum expansion / contraction amount of the left telescopic screed 9b is 1.25 m. It is supposed to be. In the initial construction state, the right telescopic screed is extended by 0.75 m and the left telescopic screed is extended by 0.75 m, resulting in a pavement width of 1.5 + 0.75 + 0.75 = 3 m.

When a two-row bar feeder is used, here, it is assumed that the mixture is uniformly supplied from the left and right bar feeders 2a and 2b to the pavement width of 3 m. In this case, the amount of mixed material to be supplied from the bar feeder on one side is 1.5 (m) × 0.05 (m) × 3 (m) = 0.225 (cubic meter). Therefore, the amount of mixture to be supplied from the bar feeders 2a and 2b on both sides is 0.225 (cubic meter) x 2 = 0.45 (cubic meter). By the way, assuming that the maximum transfer rate per minute by both bar feeders 2a and 2b is 2.36 (cubic meters), in this initial state, 0.45 / 2.36 = about 19%, which is a bar. The feeders 2a and 2b are carrying the mixture.

It is assumed that either the right telescopic screed 9a or the left telescopic screed 9b is extended by 50 cm, that is, the screed width (pavement width) on one side is extended by 50 cm with respect to such an initial state. It is possible that the telescopic screeds 9a and 9b on both sides extend with the same or different extension amounts, but even in that case, the required amount of mixture is calculated for each side, and the rotation speed of the bar feeder and screw for each side is calculated. It will be calculated.

When the screed is stretched, it is necessary to mention the mixture holding dimension in front of the screed as necessary information as a premise. And here, it is assumed that the holding dimension in front of the screed is, for example, a width of 40 cm and a height of 40 cm. Here, the width and the height correspond to the diameters of the screws 3a and 3b when viewed from the front of FIG. 1, but are not limited.

Then, when the pavement width on one side is increased by 50 cm, a volume integral corresponding to the holding dimension in front of the screed and a mixture material corresponding to the extended pavement width are additionally required. Therefore, an additional mixture of 0.4 (m) x 0.4 (m) x 0.5 (m) = 0.08 (cubic meter) is required.

As described above, in the operation of S203, the controller 13 calculates the insufficient amount of mixed material. The above calculation formulas and numerical values are merely examples for understanding the invention, and within the range of design that can be normally performed by those skilled in the art in consideration of the size and performance of the road pavement machine 1. Since the controller 13 may be programmed so as to appropriately determine the calculation method and calculate the insufficient amount of mixed material, the present invention is not naturally interpreted in a limited manner.

Subsequently, the control by the controller 13 after the calculation of the insufficient mixture amount will be described. The cotroller 13 speeds up the bar feeders 2a and 2b within the permissible range of the engine (S204). This means that the bar feeders 2a and 2b are rotated at the maximum speed within the permissible range of the engine, and is an operation for transporting the insufficient mixture to the screw side as soon as possible. However, the present invention is not limited to rotating the bar feeders 2a and 2b at the maximum speed within the permissible range of the engine, but simply increases the speed of the bar feeders 2a and 2b as much as possible. The insufficient mixture may be conveyed to the screw side.

The rotation speeds of the bar feeders 2a and 2b may be changed according to the expansion and contraction widths of the left and right screeds. For example, when only the right telescopic screed 9a is stretched, only the right bar feeder 2a may be accelerated. Further, the rotation speeds of the left and right bar feeders 2a and 2b may be increased so as to have a difference.

As an example, consider the case where 0.45 (cubic meters) of mixed material per minute can be conveyed by the bar feeders 2a and 2b in the initial construction state. In this case, it is assumed that the maximum transport amount within the engine permissible range by the bar feeders 2a and 2b is 2.36 (cubic meters) per minute. At this time, it is assumed that only the right telescopic screed 9a is extended by 50 cm, and it is necessary to add 0.08 (cubic meter) of the mixture.

Assuming that only the right bar feeder 2a is accelerated, 1.18 (cubic meter), which is half of 2.36 (cubic meter), is the maximum transport amount per minute of the right bar feeder 2a. Then, in the initial construction state, the left and right bar feeders 2a and 2b are used to convey a mixture of 0.45 (cubic meters) per minute. Therefore, with the right bar feeder 2a alone, half of that is 0. 225 (cubic meter) is the amount of transportation per minute. Therefore, 0.955 (cubic meter), which is obtained by subtracting 0.225 (cubic meter) from the maximum transport capacity of 1.18 (cubic meter) of the right bar feeder 2a, is the surplus capacity of the transport capacity per minute of the right bar feeder 2a. It becomes.

Therefore, in order to transport an additional 0.08 (cubic meter) mixture, only the right bar feeder 2a should be accelerated for 0.08 ÷ (0.995 ÷ 60) = 5.0 (seconds). It turns out to be good.

Needless to say, the operator may appropriately correct the time for increasing the speed in S204 based on the experience of the operator.

At the same time, the controller 13 speeds up the screws 3a and / or 3b within the permissible range of the engine (S205). This means that the screws 3a and 3b are rotated at the maximum speed within the permissible range of the engine, and is an operation for transporting the insufficient mixture to the screed side as soon as possible. However, the present invention is not limited to rotating the screws 3a and 3b at the maximum speed within the permissible range of the engine, and simply increases the speeds of the screws 3a and 3b to cause a shortage as much as possible. The mixture may be conveyed to the screw side.

The rotation speeds of the screws 3a and 3b may be changed according to the expansion and contraction widths of the left and right screeds. For example, when only the right telescopic screed 9a is extended, only the right screw 3a may be accelerated. Further, the speed may be increased so as to have a difference in the rotation speeds of the left and right screws 3a and 3b.

Consider an example. Similar to the above example, it is assumed that the current transport rate of the bar feeder on one side is 0.225 (cubic meter) per minute. Here, it is assumed that the maximum transfer amount of the screw on one side per minute is 0.75 (cubic meter) per minute. In such a case, from 0.225 ÷ 0.75 = 0.3, it can be seen that the screw on one side should be operated at a rotation speed of 30%. In this case, it is assumed that the screed on one side spreads by 50 cm and is transported from the bar feeder by 0.08 (cubic meter) more as described above.

Since the screw on one side is currently transporting at 0.225 (cubic meters) per minute, subtract 0.225 (cubic meters) per minute from the maximum transport capacity of 0.75 (cubic meters) per minute for the screw. It can be said that 0.525 (cubic meter) per minute is the transfer capacity of the screw.

Therefore, in order to convey the increased amount of 0.08 (cubic meter), the speed of the screw on one side should be increased for 0.08 ÷ (0.525 ÷ 60) = about 9.1 (seconds). I understand.

The above calculation example is merely an example, and a person skilled in the art will program the controller 13 so as to calculate the acceleration time of the bar feeder and the screw by an appropriate calculation method based on the experience and knowledge as appropriate. It is good to do it.

Needless to say, the operator may appropriately correct the time for increasing the speed in S205 based on the experience of the operator.

After the speed increase, the controller 13 determines whether or not the addition of the insufficient mixture amount is completed (S206). Various judgments can be considered for this purpose. For example, based on the time for accelerating the speed of the bar feeders 2a and 2b or the screws 3a and 3b, the amount of transportation can be obtained, and it can be determined whether or not the addition of the insufficient mixture amount is completed.

Although the calculation is simplified here, of course, there is a hydraulic response time, so the time for accelerating the bar feeder and the screw may be calculated in consideration of such a response time. Needless to say.

Further, the amount of the mixed material that has passed through the outlet of the bar feeder may be recognized by a sensor, image recognition, or the like, and it may be determined whether or not the addition of the insufficient mixed material is completed.

Next, the controller 13 operates the bar feeders 2a and 2b and the screws 3a and 3b with a transport amount and a diffusion amount commensurate with the increased pavement width (S207). In S207, the transport amount according to the expansion width is calculated.

An example of a method of calculating the amount of transportation corresponding to the increased pavement width will be described. For example, if only the right bar feeder 2a is extended and the construction width is increased from 3 m to 3.5 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min, then the right telescopic screed 9a The amount of mixture required per minute is 2.0 (m) x 0.05 (m) x 3 = 0.3 (cubic meter). Note that 2.0 (m) is 0.75 (m), which is half the width of 1.5 (m) of the main screed 4, and 0.75 (m), which is the original extension of the right telescopic screed 9a. ), The total value with the extended 0.5 (m).

Assuming that the maximum transfer amount per minute by both bar feeders 2a and 2b is 2.36 (cubic meters), the maximum transfer amount of the right bar feeder 2a is 1.18 (cubic meters), which is half. Therefore, 0.3 (cubic meter) is 0.3 ÷ 1.18 = about 25%. Therefore, in the initial construction state, when transporting at 19%, it is necessary to increase the speed by 25-19 = 6%. Therefore, in such an example, the controller 13 instructs the right bar feeder 2a to increase the speed by 6% and operates it.

The left bar feeder 2b may operate with the original command value without increasing the speed. Here, the original command value of the left bar feeder 2b is 1.5 (m) × 0.05 (m) × 3 = 0.225 cubic meters / min, which is 19% of the maximum transfer amount.

The left and right telescopic screeds 9a and / or 9b may expand and contract with different expansion and contraction widths, but in this case as well, the speed increase amount of each bar feeder depends on the expansion and contraction width of the right or left screed. All you have to do is decide. That is, in the above example, the expansion / contraction amount of the left expansion / contraction screed 9b is only 0 cm. The amount of mixed material per minute may be calculated, and the amount of increase in the rotational speed of the left bar feeder 2b may be determined by comparing it with the initial construction state.

In the case of the two-row type, when one screed is extended and the other screed is contracted, the extended screed side bar feeder and screw are operated after S201, and the reduced screed side bar feeder and screw are operated. , S301 and later operations will be performed.

The screws 3a and / or 3b may be accelerated by the same acceleration amount as that of the bar feeders 2a and / or 2b. However, the controller 13 may calculate the acceleration amount of the screws 3a and / or 3b according to the acceleration amount of the bar feeder 2a and / or 2b in consideration of the performance of the screw and the like.

For example, a method of calculating the acceleration amount of the screws 3a and / or 3b as follows is shown here as an example. When the construction width is 3.5 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min, the mixture required for the screw 3a on the right side is the same as the mixture required for the bar feeder 2a on the right side. 0 x 0.05 x 3 = 0.3 (cubic meter). Assuming that the maximum transfer rate of the screw on one side is 0.75 (cubic meter) per minute, from 0.3 ÷ 0.75 = 0.4, the screw 3a on the right side has a maximum rotation speed. , It can be seen that the rotation speed should be 40%. As described above, the command value of the original screw was 30%, so in this case, the speed of the screw 3a may be increased by 10%. The screw 3b on the left side may be operated at the original command value (30%).

In this way, the bar feeder 2a and / or 2b and the screws 3a and / or 3b are operated at the command value commensurate with the increased pavement width, but if there is a correction command by the operator, it is appropriate as appropriate. The controller corrects the bar feeder transfer amount and the number of rotations of the screw to operate the bar feeder 2a and / or 2b and the screw 3a and / or 3b (S208).

Next, the operation after S301 will be described. In the case of the two-row type, in S301, the controller 13 measures the operation time of the switch of the contracted telescopic screed 9a and / or 9b. Then, the controller 13 calculates the total pavement width, the reduction amount (shrinkage amount) of the right expansion / contraction screed 9a, and / or the reduction amount (shrinkage amount) of the left expansion / contraction screed 9b based on the operation time ( S302).

As with S202, it can be considered that the road pavement machine 1 is provided with means for detecting the amount of expansion and contraction after the change according to the expansion and contraction operation of the screed. The change in the amount of expansion and contraction of the screed can also be regarded as the change in the pavement width.

Then, the controller 13 calculates an excessive amount of mixed material when the screed reduction operation is performed (S303). Various calculation methods can be considered, but here, an example will be introduced.

It is assumed that the conditions in the initial construction state are the same as the conditions described in S203. At this time, assuming that the right telescopic screed 9a is shortened by 30 cm, as already explained, 0.4 (m) × 0.4 (m) in relation to the volume corresponding to the holding dimension in front of the screed. ) X 0.3 (m) = about 0.05 (cubic meter) of the mixture is excessive.

As described above, in the operation of S303, the controller 13 calculates the excess mixture amount. The above calculation formulas and numerical values are merely examples for understanding the invention, and within the range of design that can be normally performed by those skilled in the art in consideration of the size and performance of the road pavement machine 1. Naturally, the present invention is not limitedly interpreted because the controller 13 may be programmed so as to appropriately determine the calculation method and calculate the excess mixture amount.

Subsequently, the control by the controller 13 after the calculation of the excess mixture amount will be described. The cotroller 13 stops the bar feeders 2a and 2b (S304). This is an operation for stopping the transfer of the excess mixture to the screw side as soon as possible by stopping the bar feeders 2a and 2b. However, in the present invention, the bar feeders 2a and 2b may be simply decelerated so that excess mixture is not conveyed to the screw side as much as possible.

The rotation speeds of the bar feeders 2a and 2b may be reduced or stopped according to the expansion and contraction widths of the left and right screeds. For example, if only the right telescopic screed 9a contracts, only the right bar feeder 2a may be decelerated or stopped. Further, the speed may be reduced so as to have a difference in the rotation speeds of the left and right bar feeders 2a and 2b.

Next, an example of how much the bar feeder is stopped will be described. As described above, it is assumed that the transport amount is 0.225 (cubic meter) per minute only with the right bar feeder 2a in the initial construction state.

Therefore, if it is desired to stop the 0.05 (cubic meter) mixture, the right bar feeder 2a should be stopped for 0.05 ÷ (0.225 ÷ 60) = about 13.3 seconds. At this time, the left bar feeder 2b is rotating in the initial construction state.

Needless to say, the operator may appropriately correct the time to stop at S304 based on the experience of the operator.

At the same time, the controller 13 stops the screws 3a and / or 3b (S305). The stop time here may be the same as the stop time in the bar feeders 2a and / or 2b in S304, or may be stopped after the stop time is calculated by the calculation example shown below. ..

Consider an example of the stop time of the screws 3a and / or 3b. Similar to the above example, it is assumed that the current transport rate of the bar feeder on one side is 0.225 (cubic meter) per minute. Here, it is assumed that the maximum transfer amount of the screw on one side per minute is 0.75 (cubic meter) per minute. In such a case, from 0.225 ÷ 0.75 = 0.3, it can be seen that the screw on one side should be operated at a rotation speed of 30%. If the screed on the right side shrinks by 30 cm, 0.05 (cubic meter) of mixture will be excessive, as described above.

It can be seen that the screw on one side should be stopped for 0.05 (cubic meter) ÷ (0.225 ÷ 60) = about 13.3 seconds.

Similarly, it goes without saying that the operator may appropriately correct the time to stop at S305 based on the experience of the operator.

After the stop, the controller 13 determines whether or not the excess mixture amount has disappeared and the adjustment to an appropriate mixture amount has been completed (S306). Various judgments can be considered for this purpose. For example, it can be determined whether or not the adjustment to an appropriate mixture amount is completed based on the time when the bar feeders 2a and 2b or the screws 3a and 3b are stopped.

Further, the controller 13 may determine whether the adjustment to an appropriate mixture amount is completed by using a sensor, image recognition, or the like.

Although the calculation is simplified here, of course, there is a hydraulic response time, so the time to stop the bar feeder and the screw may be calculated in consideration of such a response time. Needless to say.

Next, the controller 13 operates the bar feeders 2a and 2b and the screws 3a and 3b with a transport amount and a diffusion amount commensurate with the reduced pavement width (S307). In S307, the amount of transportation is calculated according to the reduction width.

An example of a method of calculating the amount of transportation corresponding to the reduced pavement width will be described. For example, if only the right bar feeder 2a shrinks and the construction width decreases from 3 m to 2.7 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min, then the right telescopic screed 9a The amount of mixture required per minute is 1.2 (m) x 0.05 (m) x 3 = 0.18 (cubic meters). Note that 1.2 (m) is 0.75 (m), which is half the width of 1.5 (m) of the main screed 4, and 0.75 (m), which is the original extension of the right telescopic screed 9a. It is the value obtained by subtracting the contracted 0.3 (m) from.

Assuming that the maximum transfer amount per minute by both bar feeders 2a and 2b is 2.36 (cubic meters), the maximum transfer amount of the right bar feeder 2a is 1.18 (cubic meters), which is half. Therefore, 0.18 (cubic meter) is 0.18 ÷ 1.18 = about 15%. Therefore, in the initial construction state, when transporting at 19%, 15-19 = -4%, which means that a deceleration of 4% is required. Therefore, in such an example, the controller 13 instructs the right bar feeder 2a to decelerate by 4% and operates it. The left bar feeder 2b may operate with the original command value (0.225 cubic meters / min: 19%).

The left and right bar feeders 2a and / or 2b may expand and contract with different expansion and contraction widths, but in this case as well, the deceleration amount of each bar feeder is adjusted according to the expansion and contraction width of the screed on the right or left side. All you have to do is decide. That is, in the above example, the expansion / contraction amount of the left expansion / contraction screed 9b is only 0 cm. The amount of the mixture of materials may be calculated, and the deceleration amount of the rotation speeds of the left and right bar feeders 2a and 2b may be determined by comparing with the initial construction state.

The screws 3a and / or 3b may be decelerated at the same deceleration amount as the deceleration amount of the bar feeders 2a and / or 2b. However, the controller 13 may calculate the deceleration amount of the screws 3a and / or 3b according to the deceleration amount of the bar feeder 2a and / or 2b in consideration of the performance of the screw and the like.

Consider an example. As mentioned above, in this case the bar feeder is rotating at 0.18 cubic meters / min. Since the maximum transfer amount of the screw is 0.75 cubic meters per minute, 0.18 ÷ 0.75 = 0.24, which means that the screw rotates at a rotation speed of 24% of the maximum transfer amount of the reduced screw. I know that I should let it. That is, the screw that has been reduced from 24-30 = -6 may be decelerated by 6%.

For the non-expandable screw, the transport amount of the non-expandable bar feeder is 0.225 cubic meters / min, so 0.225 ÷ 0.75 = 0.3, which is the original command value ( It may be rotated at 30%).

In this way, the bar feeder 2a and / or 2b and the screws 3a and / or 3b are operated at the command value commensurate with the reduced pavement width, but if there is a correction command by the operator, it is appropriate as appropriate. The controller corrects the bar feeder transfer amount and the number of rotations of the screw to operate the bar feeder 2a and / or 2b and the screw 3a and / or 3b (S208).

Here, a calculation example in the case of a one-row bar feeder will be described. Unlike the two-row type, in the one-row type, the bar feeder cannot be rotated separately on the left and right, but the screw can be rotated individually on the left and right. Therefore, in the case of the Article 2 formula, the following points are generally different from the calculation example explained above.
(1) Acceleration time and speed of bar feeder when only one screed is extended (2) Deceleration time and deceleration speed of bar feeder when only one screed is contracted (3) Extend one screed In the case of the acceleration time and acceleration speed or deceleration time and deceleration speed (1) of the bar feeder when the other screed is shortened, it is judged that the entire pavement width has been expanded in the step of S101. Proceed to the operation after S201.
In the case of (2), in the step of S101, it is determined that the entire pavement width has been reduced, and the operation proceeds to the operation after S301.
In the case of (3), in the step of S101, the expansion or contraction of the entire pavement width is determined according to the amount of expansion and contraction of the left and right screeds, and the operation proceeds to the operation of S201 or S301.

In the following, in the case of the 1-row type, (1) the right screed is extended by 50 cm, (2) the right screed is shortened by 30 cm, (3) the right screed is shortened by 30 cm, and the left screed is shortened by 50 cm. A calculation example will be described for the case of stretching. As a premise, it is assumed that the construction is underway with a construction width of 3 m, a pavement thickness of 5 cm, and a construction speed of 3 m / min. In this case, 3.0 × 0.05 × 3 = 0.45 cubic meters / min. Therefore, assuming that the maximum transport amount of the bar feeder is 2.36 cubic meters / min on both sides, 0.45 / 2. From 36 = about 0.19, the bar feeder is rotating at 19% of the maximum transport amount.

(1) When the screed on the right side is extended by 50 cm in the 1-row formula (when proceeding to the operation after S201)
It is necessary to add 0.4 x 0.4 x 0.5 = 0.08 cubic meters of mixture on the right side. The bar feeder currently has a carrying capacity of 2.36-0.45 = 1.91 cubic meters / min. Therefore, the speed may be increased for 0.08 ÷ (1.91 ÷ 60) = about 2.5 seconds. The operator may be able to correct the acceleration time.

When the construction width is 3.5 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min, it is necessary to transport 3.5 × 0.05 × 3 = 0.525 cubic meters / min by the bar feeder. That is, 0.525 / 2.36 = about 22% of the maximum transport amount of the bar feeder needs to be transported. Therefore, if the bar feeder is being transported at 19%, the speed of the bar feeder may be increased by 3%.

The speed-up time and stop time of the screw are the same as in the case of the two-row type.

(2) When the screed on the right side is shortened by 30 cm in the 1-row formula (when proceeding to the operation after S301)
There is an excess of 0.4 x 0.4 x 0.3 = 0.05 cubic meters of mixture on the right side. Then, the bar feeder may be stopped for 0.05 ÷ (0.225 ÷ 60) = about 13.3 seconds. The operator may be able to correct the acceleration time.

When the construction width is 2.7 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min, it is necessary to transport 2.7 × 0.05 × 3 = 0.405 cubic meters / min by the bar feeder. That is, it is necessary to transport 0.405 / 2.36 = about 17% of the maximum transport amount of the bar feeder. Therefore, if the bar feeder is being transported at 19%, the bar feeder may be decelerated by 2%.

The speed-up time and stop time of the screw are the same as in the case of the two-row type.

(3) When the screed on the right side is shortened by 30 cm and the screed on the left side is extended by 50 cm in the 1-row formula (when proceeding to the operation after S201)
There is an excess of 0.4 x 0.4 x 0.3 = 0.05 cubic meters of mixture on the right side. It is necessary to add 0.4 x 0.4 x 0.5 = 0.08 cubic meters of mixture on the left side. A total of 0.08-0.05 = 0.03 cubic meters of mixture will need to be added.

Therefore, the bar feeder acceleration time is
From 2.36-0.45 = 1.91 cubic meters 0.03 ÷ (1.91 ÷ 60) = 1.0 seconds, it becomes 1.0 second.
The operator may correct the acceleration time.

In this case, the construction width is 3.2 m, the pavement thickness is 5 cm, and the construction speed is 3 m / min. Therefore, it is necessary to transport the bar feeder at 3.2 × 0.05 × 3 = 0.48 cubic meters / min. This requires transport at 0.48 / 2.36 = about 20% of the maximum transport amount of the bar feeder. Therefore, if the bar feeder is being transported at 9%, the speed of the bar feeder may be increased by 1%.

The speed-up time and stop time of the screw are the same as the command value of the screw when the screw is shortened by 30 cm on one side and the command value of the screw when the screw is extended by 50 cm on one side.

In the case of the one-row type, for example, when the right side is shrunk by 50 cm and the left side is widened by 30 cm. , The stop time of the bar feeder may be determined, and the deceleration command value after the bar feeder is stopped may be determined.

The correction value of the amount of the bar feeder and / or the screw conveyed by the operator may be an absolute numerical value or a correction value by a percentage, and is not particularly limited. The road paving machine 1 is provided with an input unit for inputting a correction value by the operator, and the controller 13 adjusts the amount of the bar feeder and / or the screw to be conveyed based on the correction value by the operator.

When the screed expands and contracts from the initial construction state and the construction width is changed, the controller 13 updates the initial construction state so as to use the changed construction width.

The pavement thickness may be measured by a sensor.

In the above embodiment, the controller stores information on the initial construction state, and when the screed expands or contracts, the speed or deceleration should be increased or decreased at a rate from the initial construction state. Although it was decided to control the bar feeder and the screed, the controller is not limited to this, and for example, by providing a means for detecting the rotation speed of the bar feeder and / or the screed, a rotation speed control circuit, and the like, the controller can control the bar. The number of revolutions of the feeder and / or screed may be controlled. This makes it possible to accurately control the rotation speed of the bar feeder and / or the screed.

In the above embodiment, the description is based on the assumption that the screed expands and contracts to the left and right, but even in a road pavement machine provided with a screed that expands and contracts on only one side, a bar feeder and a screw are used in the same manner as in the above embodiment. It is possible to control the amount of mixed material transported.

Although the present invention has been described in detail above, the above description is merely an example of the present invention in all respects, and the scope thereof is not intended to be limited. Needless to say, various improvements and modifications can be made without departing from the scope of the present invention. The constituent requirements of the invention disclosed in the present specification shall be established as independent inventions. The present invention also includes an invention in which each constituent element is combined by any combination method.

The present invention is a road paving machine and is industrially applicable.

1 Road paving machine 2a Right bar feeder 2b Left bar feeder 3a Right screw 3b Left screw 4 Main screed 5a Right rear wheel 5b Left rear wheel 6a Hydraulic motor for right rear wheel 5a 6b Hydraulic motor for left rear wheel 5b 7a Right bar Flood motor for feeder 2a 7b Flood motor for left bar feeder 2b 8a Flood motor for right screw 3a 8b Flood motor for left screw 3b 9a Right telescopic screed 9b Left telescopic screed 10a Hydraulic cylinder for right telescopic screed 9a 10b Left Flood Cylinder for Telescopic Screed 9b 11 Engine 12 Hydraulic Pump 13 Controller 14 Operation Panel 15 Travel Lever 16 Hydraulic Electromagnetic Proportional Valve and Hydraulic Electromagnetic Valve 16a Hydraulic Cylinder for Right Hopper 19a 16b Hydraulic Cylinder for Left Hopper 19b 17a Right Front Wheel 17b Left Front wheel 18 Main step 18a Right step 18b Left step 19 Handle 19a Right hopper 19b Left hopper 20a Right leveling arm 20b Left leveling arm 21a Hydraulic cylinder for right leveling arm 20a 21b Hydraulic cylinder for left leveling arm 20b

Claims (17)

A road paving machine equipped with a stretchable screed, a bar feeder for transporting a mixture, and a screw for diffusing the mixture.
An expansion / contraction amount detecting means for detecting the expansion / contraction amount of the screed,
A controller for controlling the amount of the mixture conveyed by the bar feeder and the screw according to the expansion / contraction amount detected by the expansion / contraction amount detecting means is provided.
The controller
When the screed is expanded, the bar feeder and the screw are accelerated to add a mixture, and then the bar feeder and the screw are operated with a transport amount according to the expansion width.
When the screed is reduced, the bar feeder and the screw are stopped or decelerated to adjust the amount of the mixture, and then the bar feeder and the screw are operated with a transport amount according to the reduced width. Road paving machine. If the screed expands
The road pavement according to claim 1, wherein the controller calculates the amount of the missing mix due to expansion and accelerates the bar feeder and the screw until the missing mix is replenished. machine. The road paving machine according to claim 2, wherein the controller calculates the amount of the missing mixture based on the expansion width and the holding dimension in front of the screed. If the screed expands
The controller according to any one of claims 1 to 3, wherein the controller calculates a transport amount according to an expansion width and operates the bar feeder and the screw based on the calculated transport amount. Road paving machine. The road pavement machine according to claim 4, wherein the controller calculates a transport amount according to an expansion width based on a construction width, a pavement thickness, and a construction speed. When the screed shrinks
Claims 1-5, wherein the controller calculates the amount of excess mixture due to shrinkage and stops or decelerates the bar feeder and the screw until the excess mixture is used. Road paving machine described in any of. The road paving machine according to claim 6, wherein the controller calculates the amount of excess mixture based on the reduction width and the holding dimension in front of the screed. When the screed shrinks
The controller according to any one of claims 1 to 7, wherein the controller calculates a transport amount according to a reduction width and operates the bar feeder and the screw based on the calculated transport amount. Road paving machine. The road pavement machine according to any one of claims 1 to 8, wherein the controller calculates a transport amount according to a reduced width based on a construction width, a pavement thickness, and a construction speed. The controller stores information about the initial construction state, and the bar feeder and the bar feeder are based on what percentage of the initial construction state should be accelerated or decelerated when the screed expands or contracts. The road paving machine according to any one of claims 1 to 9, wherein the screed is controlled. The road paving machine includes a rotation speed detecting means and a rotation speed control circuit of the bar feeder and / or the screed.
The road paving machine according to any one of claims 1 to 9, wherein the controller controls the rotation speed of a bar feeder and / or a screed. If the screed expands
The road paving machine according to any one of claims 1 to 11, wherein the controller accelerates the bar feeder and the screw within an allowable range of the engine to replenish the insufficient mixture. .. The screed is a two-row type that can be expanded and contracted to the left and right, the bar feeder is present on the left and right, and the amount of transportation can be controlled separately on the left and right, and the screw is present on the left and right and is separate on the left and right. If it is possible to control the transport volume
The controller controls the right and / or left transfer amount of the bar feeder and the right and / or left transfer amount of the screw according to the expansion and contraction amount of the right and / or left of the screed. The road paving machine according to any one of claims 1 to 12, wherein the road paving machine is characterized. When the screed is a one-row type that can be expanded and contracted to the left and right, the bar feeder cannot be controlled separately for the left and right, and the screw is present on the left and right so that the transport amount can be controlled separately for the left and right. ,
The controller is characterized in that the transfer amount of the bar feeder and the transfer amount of the right and / or left of the screw are controlled according to the expansion and contraction amount of the right and / or left of the screed. The road paving machine according to any one of 1 to 12. The operator can input a correction value for the amount of the bar feeder and / or the screw to be conveyed, and the controller can input the correction value for the amount of the bar feeder and / or the screw to be conveyed based on the correction value input by the operator. The road paving machine according to any one of claims 1 to 14, characterized in that the amount is adjusted. The road paving machine according to any one of claims 1 to 15, wherein the expansion / contraction amount detecting means detects the expansion / contraction amount of the screed based on the operation time of the expansion / contraction cylinder. The road paving machine according to any one of claims 1 to 15, wherein the expansion / contraction amount detecting means detects the expansion / contraction amount of the screed based on the expansion / contraction cylinder or a sensor attached to the screed.

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