JP2020122324A - Road cutter and road cutter vehicle - Google Patents

Abstract

To provide a road cutter and road cutter vehicle including a front cover capable of enhancing the loading efficiency of cut objects even at various cutting depths.SOLUTION: A road cutter 1 rotates a cutting drum 11 having a plurality of bits 12 to scrape and chip a road surface and send a cut object to a conveyor 40. The road cutter 1 comprises: a drum unit 10 that rotatably holds the cutting drum 11 and has a discharge port 14 for sending the cut object to the conveyor 40; a front cover 30 that covers the front surface of the drum unit 10 and has a shape in which a section corresponding to the discharge port 14 is open; a front cover vertical cylinder 32 that moves the front cover 30 up and down; and a side cover 20 and wire-type winding potentiometer 21 that detect the cutting depth by the cutting drum 11. The front cover vertical cylinder 32 moves the front cover 30 up and down in association with the detected cutting depth.SELECTED DRAWING: Figure 8

Description

The present invention relates to a road surface cutting machine for cutting a road surface and a road surface cutting vehicle using the same, and more specifically, a road surface is scraped by rotating a cutting drum having a large number of bits. The present invention relates to a road surface cutting machine and a road surface cutting vehicle provided with a mechanism for feeding cut products to a conveyor.

A road surface cutting machine and a road surface cutting vehicle provided with a mechanism for scraping a road surface by rotating a cutting drum having a large number of bits and feeding the scraped cut product to a conveyor are described in Patent Documents 1 to 7. In the past, various proposals have been made. In these road surface cutting vehicles, the scraped cuttings are sent to a conveyor and loaded into a vehicle running in parallel.

The cutting material must be efficiently fed from the cutting drum to the conveyor so that it does not remain on the road surface.

Conventionally, as described in Patent Document 1, a rubber plate is elastically deformed by using a front cover (7) made of a rubber plate on a lower portion of a front surface of a machine frame (2) holding a cutter drum (3). Then, the cut material was sent from the machine frame (2) to the conveyor device (12) so as to eliminate the gap with the road surface.

In Patent Document 2, the frame body (5) has curved cutting edges (9, 12) (bottom edge of bottom plate) on the side of the scraping means (6), and the cutting edge (12) is laterally oriented. It can be slid on. Therefore, Patent Document 2 discloses a device for scraping the waste material by expanding the width when the waste material is scattered outside the lateral width.

Patent Document 3 discloses a front cover (6) made of a rubber material or the like attached to a fixed frame (11). Further, Patent Document 3 discloses a front cover (10) attached to the conveyor device (20) side, and the front cover (10) can be swung upward in accordance with an arm (16). It is said that there is.

Patent Document 4 discloses a rubber cover (4a) provided below the front cover (4).

Patent Document 5 discloses a belt shoe (16) that moves up and down.

Patent Document 6 discloses a front opening/closing member (11a) for adjusting the opening/closing amount of the front gate (10c).

U.S. Pat. No. 5,837,059 discloses a belt shoe (16) that moves up and down.

Japanese Utility Model Publication No. 7-15847 Japanese Patent No. 2798312 Japanese Patent No. 3169101 Japanese Patent No. 3320873 Japanese Patent No. 3698267 Japanese Patent No. 3949493 Japanese Patent No. 4106183

When the front cover (7) is made of a rubber plate as described in Patent Document 1, when the cutting depth of the road surface becomes deep, the rubber plate bends too much, and the cut object is a machine frame of the cutter drum (3) ( Since it escaped from 2), the loading efficiency of cuttings had fallen.

It should be noted that Patent Document 1 discloses that a metal plate is used as the front cover (7) instead of the rubber plate. However, when a metal plate is used, if the cutting depth is increased, the metal plate may come into contact with the road surface and the metal plate may be damaged. In Patent Document 1, there is no description about adjustment of the cutting depth in the case of the front cover (7) using a metal plate.

In Patent Document 1, the front cover (7) is pulled open by a wire rope (15) to open the powdery and granular waste material (5b) discarded by the sweeper (24) together with the cut object, and the conveyor device (12). It discloses a mechanism for feeding to. However, the opening and closing of the front cover (7) by the wire rope (15) does not contribute to efficiently sending the cut material by the cutter drum (3) to the conveyor device (12).

In Patent Document 2, the cutting edges (9, 12) are laterally slid but fixed in the cutting depth direction. Therefore, even in the device described in Patent Document 2, if the cutting depth is increased, the cutting edges (9, 12) may come into contact with the road surface, and the cutting edges (9, 12) may be damaged.

In Patent Document 3, the front cover (6) is a rubber plate or the like, and as in Patent Document 1, when the cutting depth becomes deep, the front cover (6) is excessively bent and the efficiency of loading cut objects is reduced. Further, Patent Document 3 discloses a front cover (10) attached to the side of the conveyor device (20), and the front cover (10) can swivel upward, but this is a sweeper ( 24) is merely a mechanism for taking in the discarded powdery and granular material (5b), not a mechanism for dealing with the cutting depth.

Similarly to Patent Document 1, the rubber cover (4a) of Patent Document 4 also bends excessively when the cutting depth becomes deep, and reduces the loading efficiency of cut objects.

The belt shoe (16) described in WO 03/093200 prevents damage to the transfer belt of the conveyor means (10) from below and damage to the transfer belt due to the loaded pulverized material, i.e. between the conveyor belt and the cover plate. It is intended to prevent the crushed fragments from hitting and damage the conveyor belt when switching the position of the conveyor belt to another path (page 3, line 39 to line 42 of Patent Document 5). It does not increase the loading efficiency.

In Patent Document 6, by opening/closing the front opening/closing member (11a) and the rear opening/closing member (11b), earth and sand excavated fragments or the like passing between the rotary cutter (6) and the cover body (10) depending on the excavation depth. It is described that the amount of the cutting can be controlled (paragraph 0053 of Patent Document 6), but it does not disclose a technique capable of increasing the loading efficiency of cut objects even at various cutting depths. Absent.

Patent Document 7 merely discloses a belt shoe (16) that moves up and down in accordance with the conveying means (10), and does not disclose a technique for enhancing the loading efficiency of cut objects.

As described above, there is no conventional technique that discloses the structure of the cover on the front surface of the cutting drum (hereinafter, referred to as “front cover”) that can increase the loading efficiency of cut objects at various cutting depths. ..

Therefore, an object of the present invention is to provide a road surface cutting machine and a road surface cutting vehicle provided with a front cover that can enhance the loading efficiency of cut objects even at various cutting depths.

In order to solve the above problems, the present invention has the following features. The present invention is a road surface cutting machine that scrapes a road surface by rotating a cutting drum having a plurality of bits, and sends the scraped cut product to a conveyor. A drum unit having a discharge port for feeding a cut material, a front cover having a shape that covers the front surface of the drum unit and has an opening corresponding to the discharge port, a front cover raising/lowering unit for moving the front cover up and down, and a cutting drum And a cutting depth detecting means for detecting the cutting depth.

The front cover raising/lowering means moves the front cover up/down in conjunction with the cutting depth detected by the cutting depth detector.

The lower portion of the front cover has a bent portion that is bent toward the cutting drum.

The bent portion is replaceable.

The conveyor moves up and down in conjunction with the vertical movement of the front cover.

The front cover raising/lowering means is a cylinder attached to the drum unit.

The cutting depth detection means includes a side cover that covers the side surface of the drum unit, and a position detection unit that detects the position of the side cover.

When the cutting depth detecting means detects a predetermined value as the cutting depth by the cutting drum, the front cover and the cutting depth are interlocked with each other.

Further, the present invention is a road surface cutting vehicle capable of adjusting the cutting depth of the cutting drum by adjusting the height of the vehicle or the height of the cutting drum. Equipped with a road surface cutting machine.

According to the present invention, since the front cover moves up and down in association with the cutting depth, the distance between the ground and the lower end of the front cover can be made as narrow as possible even at various cutting depths. Therefore, the cutting material can be prevented from leaking out of the cutting drum even at various cutting depths. As a result, the rotation of the cutting drum allows the cutting material to be efficiently discharged from the discharge port. It is possible to increase the loading efficiency of the cut products on the conveyor.

Further, since the front cover moves up and down in association with the cutting depth, the front cover is prevented from being damaged even at various cutting depths.

Further, since the position of the front cover is interlocked with the cutting depth, the cutting depth can be kept constant.

By automatically interlocking the position of the front cover according to the cutting depth, it is possible to provide a road surface cutting machine and a road surface cutting vehicle that are convenient for the operator.

By providing a bent part in the lower part of the front cover, the cutting products that could not be sent from the discharge port can be returned to the cutting drum side again, so that the cutting products can be loaded again on the conveyor, resulting in cutting. The loading efficiency of goods is improved.

By making the bent portion replaceable, it is possible to prevent a decrease in loading efficiency by replacing the worn bent portion with a new one.

By linking the conveyor with the vertical movement of the front cover, the conveyor can be arranged at an appropriate position. As a result, the loading efficiency and the transportation efficiency of cuttings are improved.

If a cylinder is used as the front cover raising and lowering means, the front cover can be moved up and down with a sturdy structure.

If the cutting depth detection by the side cover is used, it is possible to reliably detect the cutting depth while preventing the cut object from coming out laterally.

By starting the interlocking between the cutting depth and the front cover when a predetermined value is detected, the operation from the start of cutting to the interlocking of the front cover becomes smooth.

The same effect as above can be obtained also in the road cutting vehicle using the road cutting machine of the present invention.

These and other objects, features, aspects, and effects of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings.

FIG. 1A is a left side view of the drum unit 10 to which the side cover 20 is attached. FIG. 1B is a front view of the drum unit 10 to which the side cover 20 is attached. FIG. 2A is a left side view of the front cover 30. FIG. 2B is a front view of the front cover 30. FIG. 3A is a left side view of the conveyor 40. FIG. 3B is a front view of the conveyor 40. 4 to 8, the road surface cutting machine 1 in which the drum unit 10, the side cover 20, the front cover 30, and the conveyor 40 are assembled is shown. FIG. 4A is a left side view showing the positional relationship of each component in the road surface cutting machine 1 before cutting. FIG.4(b) is a front view of the road surface cutting machine 1 which shows the positional relationship of each structure in the road surface cutting machine 1 before cutting. FIG. 5A is a left side view showing the positional relationship of each component in the road surface cutting machine 1 when performing zero point adjustment. FIG. 5B is a front view of the road surface cutting machine 1 showing the positional relationship between the components of the road surface cutting machine 1 when the zero point adjustment is performed. FIG. 6A is a left side view showing the positional relationship of each component in the road surface cutting machine 1 at the start of cutting. FIG.6(b) is a front view of the road surface cutting machine 1 which shows the positional relationship of each structure in the road surface cutting machine 1 at the time of cutting start. FIG. 7A is a left side view showing the positional relationship of each component in the road surface cutting machine 1 at the cutting depth a. FIG.7(b) is a front view of the road surface cutting machine 1 which shows the positional relationship of each structure in the road surface cutting machine 1 in the cutting depth a. FIG. 8A is a left side view showing the positional relationship of each component in the road surface cutting machine 1 at the cutting depth b. FIG. 8B is a front view of the road surface cutting machine 1 showing the positional relationship of each component in the road surface cutting machine 1 at the cutting depth b. FIG. 9 is a block diagram showing a main part of a functional configuration of the road surface cutting machine 1. FIG. 10 is a flowchart showing the operation of the road surface cutting machine 1 during cutting. FIG. 11 is a front view showing a main part of a modified example of the front cover 30.

Hereinafter, the configurations of the drum unit 10, the side cover 20, the front cover 30, and the conveyor 40 will be described with reference to FIGS. 1 to 3. Next, with reference to FIGS. 4 to 8, the function and role of each component when performing cutting will be described. Then, the control flow of the operation of each configuration will be described with reference to FIGS. 9 and 10.

The road surface cutting machine 1 according to the embodiment of the present invention includes a drum unit 10, a side cover 20, a front cover 30, and a conveyor 40. In the present embodiment, the road surface cutting machine 1 is assumed to be attached to the vehicle body 2. A vehicle to which the road surface cutting machine 1 is attached is called a road surface cutting vehicle.

Body cylinders 52 are attached to front wheels (not shown) and rear wheels (not shown) of the vehicle body 2. The vehicle body cylinder 52 allows the vehicle body 2 to move up and down. By vertically moving the vehicle body 2, the drum unit 10 is vertically moved. By moving the drum unit 10 up and down, the cutting depth can be adjusted.

In the present embodiment, the embodiment in which the cutting depth is adjusted by moving the vehicle body 2 up and down is given as an example, but the present invention is not limited to this. A road surface cutting machine and a road surface cutting vehicle in which the cutting depth is adjusted by directly moving the drum unit 10 up and down are also included in the present invention.

In FIG. 1, a side cover 20 is attached to the drum unit 10. In FIG. 1B, the side cover 20 is shown by a broken line in order to make the structure of the drum unit 10 easy to understand. The side cover 20 is attached to the drum unit 10 by a side cover suspension wire 24 so as to move up and down. The side cover 20 can be moved up and down by the side cover suspension wire 24, but the descending is caused by the gravity of the side cover 20 (but not limited to this). The wire take-up type potentiometer 21 is always pulled by a spring (not shown) in a winding direction of a potentiometer wire (not shown). The potentiometer wire is attached to the upper end of the side cover 20 while being slightly pulled out. The position of the side cover 20 can be detected by the wire take-up potentiometer 21. The side cover suspension wire 24 and the potentiometer wire may also be used.

The drum unit 10 includes a cutting drum 11, a large number of bits 12, a drum cover 13, and a discharge port 14. The cutting drum 11 is held by a rotation driving unit (not shown) so as to be rotatable clockwise in FIG. 1B. The bit 12 is mounted around the cutting drum 11, for example, in a spiral shape. The bit 12 is made of a hard material so that the road surface can be scraped. The bit is also called a chisel. Needless to say, any known structure can be used as the structure of the cutting drum 11 including the plurality of bits 12.

The drum cover 13 is a frame body for surrounding the cutting drum 11. The front side (left side in FIG. 1B) of the drum cover 13 has a duct shape that is open so that the discharge port 14 is formed.

As the cutting drum 11 rotates, a large number of bits 12 scrape the road surface. The road surface scraped by the bit 12 is scraped according to the rotation of the bit 12, and is sent toward the discharge port 14 by the centrifugal force and loaded on the conveyor 40.

In addition, in FIG. 1B, a back cover is also shown on the right side of the cutting drum 11 in the drawing, but since it is not directly related to the present invention, description of the back cover is omitted.

In FIG. 2, the front cover 30 includes a pair of left and right hook frames 31 and a pair of left and right front cover vertical cylinders 32. The front cover 30 is mainly formed of a metal plate. The front cover 30 has a shape in which a portion corresponding to the discharge port 14 is opened. The lower portion of the front cover 30 has a bent portion 36 that is bent toward the cutting drum 11 (inside). At the lower end of the front cover 30, a horizontally long rope 35 extending in the left and right direction of FIG. 2A is replaceably attached by a plurality of bolts 35a. The rope 35 is a component that can be replaced when worn, and is a member that forms the bent portion 36.

The hooking frame 31 is a frame on which the hanging shaft 44 of the conveyor 40 can be hooked. The hanging frame 31 is not limited to the illustrated shape as long as the hanging shaft 44 can be hung.

The front cover vertical cylinder 32 is a hydraulic cylinder or the like, and is attached to the drum unit 10. The front cover 30 can be moved up and down by expanding and contracting the front cover vertical cylinder 32. The mechanism for raising and lowering the front cover 32 is not limited to the front cover vertical cylinder 32, and the front cover 32 may be raised and lowered by winding a wire, a ball screw, or the like. That is, in the present invention, the front cover raising/lowering means for raising and lowering the front cover may be provided.

In the embodiment shown in FIG. 2, the front cover vertical cylinder 32 is assumed to have a built-in sensor capable of detecting the expansion/contraction amount of the cylinder. However, a cylinder that does not include such a sensor may be used as the front cover vertical cylinder 32. In that case, a front cover potentiometer 33 may be provided as shown in FIG. 9 so that the position of the front cover 30 can be detected. Therefore, as a function, a cylinder for moving the front cover 30 up and down and a position detection unit for detecting the position of the front cover 30 may be provided. In addition, also in other configurations, a portion described as a potentiometer in the present specification is only an example of a position detection unit, and the position detection of the present invention is not limited to that performed by the potentiometer. For example, the position detector that detects the position of the side cover 20 is not limited to the wire winding potentiometer 21 and the side cover potentiometer 22.

In FIG. 3, the conveyor 40 has a mechanism for rotating the conveyor belt 45. Since the mechanism is well known, detailed description is omitted. The conveyor 40 has a belt receiving portion 46 at the bottom. The belt receiving portion 46 prevents the conveyor belt 45 from coming into contact with the road surface, thereby preventing damage to the conveyor belt 45. The conveyor 40 has a pair of left and right suspension shafts 44 at the left and right upper ends. The suspension shaft 44 is a support shaft that can be hooked on the hanging frame 31.

The suspension wires 43 are attached to the suspension shafts 44, respectively. Since the opposite end (not shown) of the conveyor 40 is swingably attached to the vehicle body 2, the conveyor 40 can be moved up and down by winding or sending out the suspension wire 43.

The mechanism for winding or sending out the suspension wire 43 is not particularly limited to the present invention, but an example will be described here. The conveyor vertical cylinder 41 and the pulleys 41 a to 41 c are attached to the drum unit 10. In FIG. 3, the right and left suspension wire 43 in FIG. 3A is moved through the pulley 41a so that the right and left suspension shafts 44 move up and down as the conveyor vertical cylinder 41 expands and contracts in the left and right directions. It is connected to the hanging shaft 44. On the other hand, the left and right suspension wires 43 in FIG. 3A are moved by the left and right suspension wires 43 in FIG. It is connected to the hanging shaft 44.

In the road surface cutting machine 1 in this embodiment, the cutting depth is measured by the amount of vertical movement of the side cover 20. A method of measuring the cutting depth will be described with reference to FIGS. 4 to 8, 9 and 10.

When the vehicle is moved before starting the cutting, the height of the cutting drum 11 is adjusted by the vehicle body cylinder 52 so that the lower end of the bit 12 is located above the ground GL, as shown in FIG. There is. Before cutting, the lower end of the side cover 20 is lower than the lower end of the bit 12. However, the side cover 20 may be lifted up during the movement.

When aligning the cutting positions, the bit 12 and the ground GL are set to be in a state of being separated by a certain distance (for example, 50 mm) or more. At this time, the side cover 20 is suspended by the side cover suspension wire 24 so that the bit 12 and the ground GL can be visually recognized.

After the cutting position is determined in this way, the operator operates the vehicle body up/down switch 53 (not shown in FIGS. 4 to 8) to drive the vehicle body cylinder 52 to drive the bit 12 and the ground GL. Lower the drum unit 10 until they come into contact with each other. At this time, the cutting drum 11 is rotating. Then, the side cover 20 is manually lowered until the side cover suspension wire 24 is loosened, and the ground GL and the side cover 20 are brought into contact with each other. That is, the tip of the bit 12 is aligned with the bottom surface of the side cover (FIG. 5 and S101). In addition, after lowering the side cover 20 to the ground GL, which is the lower end, the drum unit 10 may be lowered until the bit 12 comes into contact with the ground GL for alignment. The state of FIG. 5 is a cutting depth of 0 (mm), and this point is called a zero point.

Assuming that the position signal of the side cover potentiometer 22 (or the wire take-up potentiometer 21. The same applies hereinafter) at the zero point represents the cutting depth 0, the operator operates the cutting depth operation panel 51 to operate the controller. The position signal of the side cover potentiometer 22 at the zero point is stored in 50 (S102). At this time, the operator is shown a display indicating that the cutting depth is zero. The zero point is set every time construction is performed.

In this way, the controller 50 stores the position signal of the side cover potentiometer 22 at the zero point, so that the controller 50 compares the position signal of the subsequent side cover potentiometer 22 with the position signal at the zero point. It becomes possible to detect the cutting depth.

For example, as shown in FIG. 7, when cut to the cutting depth a, the side cover suspension wire 24 is shortened by the cutting depth a, so the position signal of the side cover potentiometer 22 and the zero point. The controller 50 can recognize that the cutting depth is a by comparing with the position signal in. The same applies to the case of the cutting depth b in FIG.

Next, the operation after the zero point adjustment will be described.

When starting the cutting, the operator operates the front cover up/down switch 34 and the conveyor up/down switch 42 to lower the conveyor 40 and the front cover 30 to the lower limit (FIG. 6: S103). When the conveyor 40 and the front cover 30 are lowered to the lower limit, it is assumed here that the height from the ground GL to the lower end of the front cover 30 is a (mm), as shown in FIG. Note that a is usually a value relating to the minimum cutting depth of the road surface (for example, 50 mm or the like), but in the invention, a is a value of 0 or more including 0.

When the conveyor 40 and the front cover 30 are lowered to the lower limit, the controller 50 turns off the conveyor vertical cylinder 41 so as not to drive it (S104). As a result, the conveyor 40 is placed in the hook frame 31, so that the conveyor 40 also moves up and down in conjunction with the vertical movement of the front cover 30.

The controller 50 stores the position signal of the front cover potentiometer 33 in the state of S104 as a signal corresponding to the cutting depth a (S105).

Next, the operator inputs a desired cutting depth to be constructed (S106). For example, it is assumed that the cutting depth b (mm) (b≧a) is input. After inputting the cutting depth, cutting starts. Specifically, the operator rotates the cutting drum 11 by using a cutting drum rotation switch (not shown) and lowers the vehicle body cylinder 52 by using the vehicle body up/down switch 53. To start cutting. The operator appropriately moves the vehicle forward.

During cutting, a position signal from the side cover potentiometer 22 is input to the controller 50. The controller 50 can measure the current cutting depth based on the position signal from the side cover potentiometer 22 (S107).

Then, the controller 50 determines whether or not the current cutting depth is the desired cutting depth b (S110), and if the current cutting depth and the desired cutting depth b match, the controller 50 does not change the current cutting depth. The measurement of the cutting depth is continued, and if different, a signal for expanding and contracting the vehicle cylinder 52 is output according to the difference to expand and contract the vehicle cylinder 52 (S111). As a result, the vehicle cylinder 52 is controlled so as to obtain the desired cutting depth, so that the cutting drum 11 can continue cutting at the desired cutting depth. Although the controller 50 automatically controls the cutting depth under the control of S110 and S111 here, the operator manually confirms the cutting depth while confirming the cutting depth displayed by the controller 50. The vehicle cylinder 52 may be adjusted so that Further, once the operator manually adjusts the cutting depth until the desired cutting depth is reached, and when the desired cutting depth is reached, the cutting depth is then automatically controlled as in S110 and S111. May be adjusted.

In parallel with the operations of S110 and S111, the controller 50 executes the operations of S108 and S109.

The controller 50 determines whether or not the current cutting depth is a or more (S108). When the cutting depth is less than a, there is still a gap between the ground GL and the lower end of the front cover 30. Therefore, when the cutting depth is less than a, there is no possibility that the front cover 30 may come into contact with the ground GL and be damaged, so the controller 50 continues to dig.

In S108, when the cutting depth is equal to or larger than a (FIG. 7), that is, a predetermined value corresponding to the height between the lower end and the ground GL when the front cover 30 is moved to the lower limit is set. When detected as the cutting depth, there will be no gap between the ground GL and the lower end of the front cover 30. Therefore, when cutting further, the front cover 30 must be moved upward. May contact and damage the ground GL. Therefore, the controller 50 outputs an expansion/contraction signal for controlling the front cover vertical cylinder 32 so that the position signal of the front cover potentiometer 33 becomes equal to the current cutting depth (S109). It should be noted that the equivalent value here means that the cutting depth does not have to be exactly the same as the height a, and when the cutting depth reaches a value within a predetermined range, the front This is to include the meaning of starting the interlocking of the cover 30 and the cutting depth. That is, it means that the interlocking may be started when the cutting depth becomes “a−c (mm) (here, c≧0)” which is a predetermined value.

By the operation of S109, the lower end of the front cover 30 coincides with the ground GL, so that the front cover 30 is not damaged. Further, since there is no gap between the ground GL and the lower end of the front cover 30, the cut material is efficiently fed to the conveyor 40 without leaking outside.

Although not shown, after S109, if the current cutting depth becomes smaller than a, the controller 50 controls the front cover vertical cylinder 32 so that the position signal of the front cover potentiometer indicates the cutting depth. The front cover 30 is lowered to the lower limit so as to point to a.

By allocating the conveyor 40 to the front cover 30, the hanging wire 43 bends, and the conveyor 40 moves up and down in conjunction with the movement of the front cover 30, as shown in FIGS. 7 and 8. In FIGS. 7 and 8, the double wavy line in the suspension wire 43 means that the suspension wire 43 has a room to bend.

The current cutting depth measured by the side cover potentiometer 22 always changes according to the state of the road surface. The road surface is cut near the desired cutting depth b (FIG. 8).

According to this embodiment, the front cover 30 is controlled so as to be movable up and down, and is linked to the current cutting depth so that a gap is not formed between the lower end of the front cover 30 and the ground GL as much as possible. Then, the position of the front cover 30 is controlled. Therefore, since the position of the front cover 30 changes according to the cutting depth, damage to the front cover 30 is prevented, and the cut objects are prevented from leaking from the drum unit 10, thus improving the loading efficiency of the cut objects. To do.

Further, if the position of the front cover 30 does not interlock with the cutting depth, the cutting depth may not be constant due to the rattling of the front cover 30 even if the front cover 30 is not damaged. There is. However, as in the present embodiment, the position of the front cover 30 is interlocked according to the cutting depth, so that the cutting depth is kept constant.

It is difficult for the operator to operate the front cover 30 while visually observing the position of the front cover 30. In the present embodiment, the position of the front cover 30 automatically moves up and down in association with the cutting depth, and the road surface cutting machine 1 is convenient for the operator.

Although the front cover 30 is linked with the cutting depth, it does not exclude any manual operation by the operator. It goes without saying that the front cover 30 may be moved according to the switch operation by the operator.

In the present embodiment, the conveyor 40 is mounted on the front cover 30 so that the conveyor 40 including the belt receiving portion 46 moves up and down in conjunction with the front cover 30. As a result, even if the position of the conveyor 40 is not controlled, the position of the conveyor 40 can be reliably arranged at an appropriate position in accordance with the cutting depth, so that the loading efficiency and the transportation efficiency of cut objects are improved. Will be done. In addition, arranging the conveyor 40 on the front cover 30 means that the load of the conveyor 40 is placed on the front cover 30 and the conveyor 40 also moves up and down in conjunction with the vertical movement of the front cover 30.

However, the present invention does not exclude a configuration in which the position of the conveyor 40 is adjusted in association with the cutting depth. Of course, it goes without saying that the conveyor 40 may also be controlled so as to be linked to the cutting depth. For example, the conveyor 40 and the front cover 30 can be interlocked by controlling the conveyor up-and-down cylinder 41 to be moved up and down based on a signal for moving the front cover 30 up and down. Also, other interlocking methods may be used.

The bent portion 36 at the lower end of the front cover 30 is not limited to the shape of a bent plate. As shown in FIG. 11, at the lower end of the front cover 30, the rope plate portion 35 is attached to the cutting drum 11 with bolts 35a so as to incline toward the cutting drum 11. As a result, the lower end of the front cover 30 is bent. Even in such a case, it is included in the bent portion 36 at the lower end of the front cover 30.

The cutting material scraped off by the cutting drum 11 will be scraped forward, but the cutting material that did not reach the discharge port 14 is moved to the cutting drum 11 side by the bent portion 36 at the lower end of the front cover 30. It will slide down. Therefore, the returned cutting material is scraped out to the discharge port 14 side by the centrifugal force of the cutting drum 11. Therefore, the presence of the bent portion 36 also improves the loading efficiency of cut objects.

The bent portion 36 may be made of a member having wear resistance and is not limited to being replaceable. However, by making the bent portion 36 replaceable, it becomes possible to perform maintenance when it is worn.

In the above-described embodiment, the position of the side cover 20 is used to detect the cutting depth. However, in addition to the position of the side cover 20, the cutting depth is determined by a radar, an ultrasonic sensor, an image recognition processing device, or the like. The present invention also includes an invention in which the position of the front cover 30 is adjusted so as to be directly measured using a sensor or a device and to be linked to the measured cutting depth. That is, in the present invention, the cutting depth detecting means for detecting the cutting depth by the cutting drum 11 may be provided, and one example of the cutting depth detecting means is the side cover 20 and the wire winding type potentiometer (or , Side cover potentiometer 22).

In the above-described embodiment, the cutting depth is adjusted by adjusting the height of the vehicle, but as described at the beginning, the present invention changes the cutting depth by moving the drum unit 10 up and down. It may be an adjusting device. In that case, in the operation in S111, the present invention can be implemented by controlling the mechanism for moving the drum unit 10 up and down.

In the above-described embodiment, the configuration in which the bent portion 36 of the front cover 30 is provided has been described. However, since the invention is established even if the front cover 30 is controlled in conjunction with the cutting depth, the bent portion 36 is Mandatory is not a configuration either.

Although the present invention has been described in detail above, the above description is merely an exemplification of the present invention in all respects, and is not intended to limit the scope thereof. It goes without saying that various improvements and modifications can be made without departing from the scope of the present invention.

INDUSTRIAL APPLICABILITY The present invention is a road surface cutting machine and a road surface cutting vehicle, and is industrially applicable.

1 Road Surface Cutting Machine 2 Car Body 10 Drum Unit 11 Cutting Drum 12 Bit 13 Drum Cover 14 Discharge Port 20 Side Cover 21 Wire Winding Potentiometer 22 Side Cover Potentiometer 24 Side Cover Suspended Wire 30 Front Cover 31 Hook Frame 32 Front Cover Vertical Cylinder 33 Front cover potentiometer 34 Front cover up/down switch 35 Steel plate part 35a Bolt 36 Bending part 40 Conveyor 41 Conveyor up/down cylinder 41a, 41b, 41c Pulley 42 Conveyor up/down switch 43 Suspending wire 44 Suspending shaft 45 Conveyor belt 46 Belt receiving part 50 Controller 51 Cutting Depth Control Panel 52 Body Cylinder 53 Body Up/Down Switch

Claims (8)

A road surface cutting machine that scrapes a road surface by rotating a cutting drum having a plurality of bits and sends the scraped cut material to a conveyor,
A drum unit that holds the cutting drum rotatably and that has a discharge port for sending a cut product to the conveyor;
A front cover that covers the front surface of the drum unit and has a shape in which a portion corresponding to the discharge port is open;
Front cover raising and lowering means for raising and lowering the front cover,
A cutting depth detecting means for detecting a cutting depth by the cutting drum,
The road surface cutting machine, wherein the front cover raising/lowering unit moves the front cover up/down in conjunction with the cutting depth detected by the cutting depth detection unit. The road surface cutting machine according to claim 1, wherein a lower portion of the front cover has a bent portion that is bent toward the cutting drum. The road surface cutting machine according to claim 2, wherein the bent portion is replaceable. The road surface cutting machine according to any one of claims 1 to 3, wherein the conveyor moves up and down in conjunction with vertical movement of the front cover. The road surface cutting machine according to any one of claims 1 to 4, wherein the front cover elevating means is a cylinder attached to the drum unit. The cutting depth detection means,
A side cover that covers the side surface of the drum unit,
The road surface cutting machine according to any one of claims 1 to 5, further comprising: a position detection unit that detects a position of the side cover. The interlocking between the front cover and the cutting depth is started when the cutting depth detecting unit detects a predetermined value as the cutting depth by the cutting drum. Item 7. A road surface cutting machine according to any one of items 1 to 6. A road surface cutting vehicle capable of adjusting the cutting depth by the cutting drum by adjusting the height of the vehicle or by adjusting the height of the cutting drum,
A road surface cutting machine comprising the road surface cutting machine according to claim 1.