JPH0732572Y2 - Hydraulic movable crown device for screed device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an asphalt finisher and a repairer,
The present invention relates to a hydraulic movable crown device of a screed device mounted on a road pavement or repair machine in a remixer or the like.

[Prior Art] Conventionally, the crown (road top forming mechanism) of a screed device (mixing material leveling device) mounted on a road paving and repair machine such as an asphalt finisher, repaver, remixer, etc. It has an important function of forming the road paving surface with a gradient in the transverse direction in order to collect the water into the grooves installed on both sides or near the center of the road.

As an example, a work pattern for laying an asphalt mixture (hereinafter referred to as a mixture) by an asphalt finisher will be described. Figure 7 shows the asphalt finisher 55
Is a side view and FIG. 8 is a plan view of the same.

The mix 56 is transported by the dump truck 57,
Dropped by the hopper 58 of the finisher 55. The mixture material 56 in the hopper 58 is sent to the rear of the asphalt finisher 55 by the bar conveyor 59, and is diffused in the left and right working width directions by the conveyor screen 60. The diffused composite material 56 is attached to the main screed device 61 attached to the rear portion of the asphalt finisher 55, and to the main screed device 61 via a telescopic support portion (not shown), and a hydraulic cylinder (not shown). Thus, a predetermined road width 63 and a predetermined pavement thickness 64 are formed by the expandable and contractible screed 62 of the main screed device 61 in the left-right direction.

At the center of the main screed device 61, a so-called screw jack called a main crown device 65 is installed. As shown in FIGS. 9 (a) and 9 (b), the main screed device 61 is bent by the main crown device 65 to form the asphalt pavement surface 66, and the base plate 67 is bent so that rainwater can penetrate the asphalt pavement surface 66 to the side gutter on the side of the road. It can be molded into a shape that flows into 68.

Generally, the crown gradient 69, 69 is about 0 to 3%.

Moreover, the recent screed device is shown in FIGS.
As shown in (c), a pavement finish shape with a special cross section, a shoulder sloping shape 69, a 3-point regular crown shape 7
0, in order to be able to cope with the rut shape 71, the auxiliary crown device 72 shown in FIG. 11 is provided so that the telescopic screed device 62 can be bent with respect to the main screed device 61 as well as the main crown device 65. There is. Telescopic screed device
62 bends around the bending center pin 73 with respect to the main screed device 61, and the telescopic screed 62 expands and contracts in the bent direction by the hydraulic cylinder 62a.

The main crown device 65 will be described with reference to FIG. Brackets 50, 50 and 53 are fixed to the left and right frames 1 and 2 of the main screed device 61. The sleeve 8 of the screw jack portion 7 is rotatably attached to the bracket 53 by the pin 54, and the bearing case 14 that rotatably supports the jack bolt 10 of the screw jack portion 7 is attached to the bracket 50.
Is rotatably attached by a pin 74. Sprockets 11 and 11 are mounted on the jack bolts 10 and 10, respectively, and the sprockets 11 and 11 are connected via a roller chain 75. A ratchet handle 76 is attached to the end portion of one jack bolt 10, and the one jack bolt 10 is rotated by rotating the ratchet handle 76. The other jack bolt 10 connected by the roller chain 75 rotates at the same time to expand or contract the distance L ₃ between the pins 54 and 74. When the distance L ₃ between the pins 54 and 74 is opened, the base plate 67 is bent downward (this case is called plus crown), and when the distance L ₃ between the pins 54 and 74 is reduced, it is bent upward ( This case is called a minus crown).

Next, the auxiliary crown device 72 will be described with reference to FIG.

Reference numeral 77 is a frame of the main screed device 61. A bearing case 14a fitted with the jack bolt 10 of the screw jack 7a is rotatably attached to the frame 77 by a pin 78. The bearing case 14a is rotatably attached to a bracket 79 fixed to the frame 77 by a pin 80. Screw jack 7a
A rod-shaped member 9 is fitted on the bottom of the sleeve 8a. The member 9 has a spherical bush on a pin 81 formed integrally with a slide base (not shown) of the telescopic screed device 62 that slides on the frame 77 of the main screed device 61.
It is fitted through 82. A ratchet handle 83 is attached to one end of the jack bolt 10a, and when the ratchet handle 83 is rotated, the jack bolt 10a is rotated and the distance L ₄ between the pins 80 and 81 is expanded / contracted, with respect to the main screed device 61. Telescopic screed device 62 centered around the bending pin 73
Tilt.

[Problems to be solved by the invention] On a general road, the set crank amount frequently changes according to the road structure, and it is necessary to shape a very complicated crown at the intersection of a curved road and a straight road.

Therefore, during the paving work, the operator has to operate the ratchet handle 76 every time the crown amount changes in addition to the other complicated work to make the crown amount of the base plate 67 match the predetermined design value. Labor is required. Further, this work is a work of mechanically reading the crown amount by a gauge (not shown) installed in the vicinity of the main crown device 65, which is a more complicated operation.

The operation of the auxiliary crown device 72 is almost the same.

As described above, the operator during the paving work has to perform operations of these ratchet levers 76 at the same time, in addition to a great number of works, which is a more complicated work.

Moreover, the operation force of the ratchet lever 76 is large,
Moreover, since it is necessary to set the crown amount that matches the initial road design value in a timely manner, a high setting speed is required, and operator fatigue becomes great.

In view of the above circumstances, the present invention provides a hydraulic movable crown device for a screed device in which a main crown device and an auxiliary crown device are operated by a driving force of pressure oil other than input to quickly and accurately set a predetermined set amount. The purpose is to do.

[Means for Solving the Problems] In order to achieve the above object, in a movable crown device of a screed device of the present invention, an output shaft screwed with a male screw is rotated by a hydraulic motor, and the output shaft is rotated by the hydraulic motor. A motor assembly to which a detector is connected, an electromagnetic switching valve connected to the hydraulic motor, and a hydraulic pump connected to the electromagnetic switching valve and supplying pressure oil of a predetermined pressure to the hydraulic motor via the electromagnetic switching valve. And a crown amount indicator connected to a power source, and connected to the rotation detector and the crown amount indicator, inputting a signal from the rotation detector and converting it to an angle signal of a crown gradient, and the crown amount indicator. And output to
A converter connected to a power source and a switch for connecting and disconnecting a current to the solenoid of the solenoid operated directional control valve. Is connected to the hydraulic cylinder with a position sensor and the above hydraulic cylinder. And the electromagnetic switching valve connected to the electromagnetic switching valve,
A hydraulic pump that supplies pressurized oil of a predetermined pressure to the hydraulic cylinder via the electromagnetic switching valve, a crown amount indicator connected to a power source, the position sensor and the crown amount indicator, and a signal of the position sensor. Is input to convert the angle signal of the crown gradient, and output to the crown amount display, consisting of a converter connected to the power supply, and a switch for connecting and disconnecting the current to the solenoid of the electromagnetic switching valve, A hydraulic cylinder is disposed between a pair of left and right screeds, the cap side of the hydraulic cylinder is swingably attached to one screed, and the tip of the piston rod is swingably attached to the other casing.

[Operation] In the present invention, the main screed device or the telescopic screed device is bent by expanding and contracting the space above the pair of left and right screeds by the hydraulic motor assembly or hydraulic cylinder that replaces the conventional manual screw jack.

In the case of a hydraulic motor assembly, a male screw is screwed on the output shaft of the motor, and this male screw is screwed into a boss nut screwed with a female screw. As it moves, one screed, to which this boss is fixed, is pulled or separated, and the pair of screed bends.

Further, in the case of the hydraulic cylinder, since the hydraulic cylinder expands and contracts, one screed is directly pulled toward or separated from the other, so that the pair of screeds bends.

A signal from a rotation detector connected to the hydraulic motor assembly or a position sensor provided on the hydraulic cylinder is converted into a crown slope angle signal by the converter and displayed as a crown slope angle on the crown amount display.

Therefore, when the switch connected to the solenoid of the solenoid operated directional control valve is turned on and off to drive the hydraulic motor or hydraulic cylinder, the screed device bends, and its inclination angle is displayed on the crown amount display.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

The same parts as those of the conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 and 2, 1 is a frame of the left main screed device 61 of the asphalt finisher 55 shown in FIG. 7, and 2 is a frame of the right main screed device 61.

Brackets 3 and 4 are fixed to the frame 1, and a bearing case 5 is pivotally supported by a pin 6. The shaft 8 of the screw shaft 7 is extended in the bearing case 5, the journal 9 is fitted therein, and the nut is tightened.

A sprocket 11 is fitted on the shaft 8.

Brackets 12 and 13 are fixed to the frame 2 and the bolt 1
The boss nut 14 that supports 0 for vertical rotation is pin 15
The screw bolt 10 is screwed to the boss nut 14 by being pivotally supported by.

A casing 18 of a motor assembly 17 is supported by a pin 19 on a bracket 16 fixed to the frame 1 so as to be vertically rotatable.

A male screw 20a is screwed on the output shaft 20 of the motor assembly 17, and a sprocket 21 is fitted to the base end of the male screw 20a. A roller chain 22 is wound around the sprockets 11 and 21. Further, brackets 23 and 24 are fixed to the frame 2, and a boss nut 25 having a female screw screwed to the male screw 20a is pivotally supported on the brackets 23 and 24 by pins 26 and 26.

As shown in FIG. 3, the casing of the motor assembly 17
A hydraulic motor 29 and a speed reducer 28 for reducing the rotation of the hydraulic motor 29 are disposed inside the rotary motor 18, and a rotation detector 30 and an electromagnetic brake 27 are mounted coaxially with the hydraulic motor 29.

The rotation of the hydraulic motor 29 is reduced by the speed reducer 28, and the output shaft 20 is rotated at a low speed. The output shaft 20 has a bearing on the cover 31.
The sprocket 21 is supported via 32 and is fitted to the base end thereof.

As shown in FIG. 4, the electromagnetic switching valve 35 is connected to the hydraulic motor 29 via oil passages 33 and 43, and the solenoid of the electromagnetic switching valve 35 is connected.
By switching the currents to 35a and 35b, the electromagnetic switching valve 35 is switched, and the hydraulic motor 29 is rotated in the forward and reverse directions.

Further, the electromagnetic switching valve 35 is connected to the hydraulic motor 39 through the oil passage 40, and is returned to the oil tank through the oil passage 41.

A relief valve 42 is connected between the oil passages 40 and 41 to keep the discharge pressure of the hydraulic pump 39 constant. 38 is a motor for driving the hydraulic motor 29, 37 is a suction filter,
Reference numeral 44 is a drain circuit of the hydraulic motor 29.

Output shaft when hydraulic motor 29 of motor assembly 17 rotates
The sprocket 21 fitted to 20 and the sprocket 11 of the screw shaft 7 connected via the roller chain 22 also rotate together with the output shaft 20, and the screw bolts 10 of the output shaft 20 and the screw shaft 7 are screwed into each other. Boss nut 25 and
14 is moved relatively in the axial direction. Therefore, the distance L ₁ between the pins 6 and 15 and between the pins 19 and 26 is expanded or contracted, and the left and right main screed devices 61 are bent.

FIG. 5 shows a control circuit of the motor assembly 17.

In the figure, 46 is a converter, 47 is a crown amount indicator for displaying the angle of the crown gradient, 48 is a current, 49 is a current to the solenoid of the solenoid operated directional control valve 35 connected to the hydraulic motor 29 of the motor assembly 17 by an oil passage. It is a push button switch panel for switching.

The converter 46 is connected to the power supply 48, inputs a signal from the rotation detector 30 of the motor assembly 17, converts it into an angle signal of a crown gradient (69 in FIG. 9), and outputs it to the crown amount display 47.

The crown amount indicator 47 is connected to the power source 48 and is connected to the converter 46.
Input the signal from to display the crown slope at +/- angle.

When the push button on the push button switch panel is operated, the electromagnetic switching valve is switched, and the output shaft 20 of the motor assembly 17 rotates forward, reverse, or stops.

Next, the operation will be described.

When the push button switch panel 49 is operated, the output shaft 20 of the motor assembly 17 is rotated as described above, and therefore the output shaft 20 is rotated for the time during which the push button is pressed, and the crown device is bent at an angle.

Meanwhile, the rotation detector 30 incorporated in the motor assembly 17 rotates and sends a signal according to the rotation angle to the converter 46,
The converter 46, which receives this signal, converts the signal into a crown gradient angle signal and sends it to the crown amount display 47.
The crown amount display 47 displays the crown slope angle at that time.

FIG. 6 shows another embodiment. In the one embodiment, the rotation of the output shaft 20 of the motor assembly 17 is mediated by the roller chain 22 wound around the sprockets 21 and 11, and the screw shaft 7 provided with the output shaft 20 is provided. At the same time, the boss nuts 25 and 14 screwed by the male screw of the output shaft 20 and the male screw of the screw bolt 10 of the screw shaft 7 are simultaneously drawn and released at the same time, but in another embodiment, a pair of screed devices are used. The hydraulic cylinders 51, 51 are arranged between the frames 1, 2 via brackets.

Position sensors are installed in the hydraulic cylinders 51, 51, respectively.

The pair of hydraulic cylinders 51, 51 are pivotally supported by brackets 50, 50 on the cap side by brackets 50, 50 fixed to the frame 1,
Head side piston rod 53 fixed to the frame 2
51b is pivoted at pin 54.

Therefore, by connecting the hydraulic cylinders 51, 51 to an electromagnetic switching valve as in the one embodiment and expanding / contracting the hydraulic cylinders 51, 51, the distance L ₂ between the pins 52, 54 can be increased or decreased.
The signal from the position sensor is converted by the converter 46 as in the embodiment.
If it is sent to the crown amount indicator 47 via the above, the same function as in the above-mentioned embodiment is achieved.

[Effects of the Invention] According to the hydraulic movable crown device of the present invention described in detail above, the following effects can be obtained.

When the operator operates the switch of the hydraulic circuit of the hydraulic actuator such as the hydraulic cylinder or the hydraulic motor, the crown amount of the main screed device can be quickly set by the hydraulic pressure, and the fatigue of the operator is greatly reduced.

In place of the conventional mechanical gauge reading work, more accurate set amount display by the sensor is possible, which makes it possible to set the crown amount that further matches the road design value, which leads to improvement of pavement quality.

Conversion that connects the electric circuit that drives the valve that switches the direction of the hydraulic oil flowing to the hydraulic actuator and stops it, and the machine switch to the microcomputer, and converts the amount detected by the sensor provided in the hydraulic actuator into the crown amount Connect a microcomputer to the container, set a crown amount that changes depending on conditions such as time and distance to the microcomputer, install a sensor to detect the above condition on the construction machine, connect it to the microcomputer, and calculate the condition input to the microcomputer While operating the directional control valve, an automatic crown setting device can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the hydraulic movable crown device of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a plan view of a half of a motor assembly used in the embodiment. Figure,
FIG. 4 is a hydraulic circuit diagram of one embodiment, FIG. 5 is an electric circuit diagram of the same, FIG. 6 is a perspective view of another embodiment, FIG. 7 is a side view of an asphalt finisher, and FIG. 8 is the same plane. FIGS. 9 (a) and 9 (b) are explanatory views of the crown gradient by the main screed device, FIGS. 10 (a), (b), and (c) are explanatory views of a pavement state by a bendable telescopic screed, FIG. 11 is a front view of a screed device in which a main screed device is provided with a bendable telescopic screed, FIG. 12 is a perspective view of a conventional main crown device, and FIG. 13 is a partially broken front view of a conventional auxiliary crown device. It is a figure. 14, 25 ... Boss nut, 17 ... Motor assembly, 18 ... Casing, 20 ... Output shaft, 20a ... Male screw, 29 ... Hydraulic motor, 3
0 ... Rotation detector, 35 ... Electromagnetic switching valve, 35a, 35b ... Solenoid, 39 ... Hydraulic pump, 46 ... Converter, 47 ... Crown amount display, 48 ... Push button switch panel, 51 ... Hydraulic cylinder, 51a
… Cap side, 51b… Piston rod, 61… Main screed, 62… Auxiliary screed.

Claims (2)

[Scope of utility model registration request] 1. A motor assembly in which an output shaft having a male screw thread is rotated by a hydraulic motor, and a rotation detector is connected to the hydraulic motor; an electromagnetic switching valve connected to the hydraulic motor; A hydraulic pump connected to the switching valve, supplying hydraulic oil of a predetermined pressure to the hydraulic motor via the electromagnetic switching valve, a crown amount indicator connected to a power source, the rotation detector and the crown amount indicator. Connected, input the signal of the rotation detector to convert it to the angle signal of the crown gradient, and output it to the crown amount display, and also to the converter connected to the power supply, and the current to the solenoid of the electromagnetic switching valve. The hydraulic motor assembly is arranged between a pair of left and right screeds, and the casing side of the hydraulic motor assembly is swingably attached to one screed. Hydraulic movable crown apparatus screed apparatus being characterized in that allowed screwed into the internal thread of Bosunatto mounted swingably external thread of the output shaft to the other screed. 2. A hydraulic cylinder having a position sensor, an electromagnetic switching valve connected to the hydraulic cylinder, and a solenoid connected to the electromagnetic switching valve and supplying hydraulic oil of a predetermined pressure to the hydraulic cylinder via the electromagnetic switching valve. Connected to the hydraulic pump, the crown amount indicator connected to the power supply, the position sensor and the crown amount indicator, and inputting the signal of the position sensor to convert it to the angle signal of the crown gradient, and displaying the crown amount. And a converter connected to a power source and a switch for connecting and disconnecting a current to the solenoid of the electromagnetic switching valve, and the hydraulic cylinder is disposed between a pair of left and right screeds,
A hydraulically movable crown device for a screed device, wherein the cap side of the hydraulic cylinder is swingably attached to one screed and the tip of a piston rod is swingably attached to the other casing.