JP5807027B2 - Construction machine - Google Patents

Description

  The present invention relates to a construction machine having a vibrator for compacting a pavement material.

  Conventionally, a steel formwork (hereinafter referred to as “mold”) is attached to a self-propelled construction machine, and the pavement material (raw concrete) supplied to the construction surface is compacted while the construction machine is advanced. A slip foam method for continuously constructing a pavement having a cross section is known.

  The construction machine used in the slip form method is a self-propelled vehicle body, a pavement material supplied to the construction surface from the conveyor, and a leveling device that spreads the pavement material and tightens the pavement material. A plurality of vibrators to be hardened and a mold for molding a paving material into a predetermined cross section are provided (for example, see Patent Document 1).

In the construction machine described above, each vibrator is vibrated in the paving material spread on the construction surface, and the paving material is compacted by the vibration.
The vibrator includes a drive motor, a bottomed cylindrical casing into which the output shaft of the drive motor is inserted, and an eccentric weight attached to the output shaft. The vibrator is configured such that the casing vibrates by rotating the eccentric weight within the casing.

  When paving materials are compacted by each vibrator, it is necessary to prevent occurrence of junkers etc. in the paved body after construction by applying vibration suitable for compacting the paving material from each vibrator to the paving material. is there. Therefore, the worker constructs the pavement while managing the vibration of the vibrator based on the rotational speed of the output shaft of the vibrator.

JP 2012-207493 A

  As a method of detecting the rotation speed of the output shaft of the vibrator, there is a method of detecting the rotation speed of the output shaft based on the supply amount of hydraulic oil or current supplied to the drive motor. When drive loss occurs in the drive mechanism in the motor, there is a problem that the detection result of the rotation speed of the output shaft is different from the actual rotation speed of the output shaft.

  It is an object of the present invention to provide a construction machine that solves the above-described problems, can accurately manage the vibration of a vibrator for compacting a pavement material, and can maintain the quality of the pavement.

In order to solve the above problems, the present invention comprises a vibrator for compacting a paving material, a proximity sensor provided in the vibrator, and a tachometer for displaying the rotational speed of an output shaft of a drive motor of the vibrator, An eccentric weight is accommodated in the casing of the vibrator. The proximity sensor is fixed to a wall portion of the case of the drive motor. Detector of the proximity sensor is protruded into the case, the detector detects the detected portion that rotates or reciprocates in conjunction with the output shaft within the casing. The tachometer has a rotation speed calculation means for converting a detection signal output from the proximity sensor into a rotation speed of the output shaft.

In this configuration, the detected part that rotates or reciprocates in conjunction with the rotation of the output shaft is directly detected by the proximity sensor, and the rotation speed of the output shaft is calculated based on the detection result. The detection accuracy of the number of rotations can be improved, and the vibration of the vibrator can be managed accurately.
In addition, since the rotation speed of the output shaft can be calculated from the number of detection signals output from the proximity sensor per unit time, the calculation process in the tachometer can be simplified, and the manufacturing cost of the tachometer Can be reduced.

  When a plurality of vibrators are provided on the construction machine, the proximity sensor and the tachometer are provided for each vibrator, thereby simplifying the structure of the tachometer and reducing the manufacturing cost of the tachometer. It is desirable.

  Since the construction machine according to the present invention calculates the rotation speed of the output shaft by detecting the detected portion that is interlocked with the rotation of the output shaft, the detection accuracy of the rotation speed of the output shaft can be increased. Therefore, in the construction machine according to the present invention, the vibration of the vibrator can be managed accurately, and the quality of the pavement can be maintained. Moreover, in the construction machine of this invention, the arithmetic processing in a tachometer can be simplified and the manufacturing cost of a tachometer can be reduced.

It is the perspective view which showed the construction machine of this embodiment. It is the sectional side view showing the vibrator of this embodiment. (A) is the sectional side view which showed the attachment state of the proximity sensor of this embodiment, (b) is the perspective view which showed the positional relationship of a proximity sensor and a to-be-detected part.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the construction machine 1 of the present embodiment continuously constructs a pavement having the same cross section by compacting the pavement material (raw concrete) supplied to the construction surface S while moving forward. It is used for the slip form method.

  The construction machine 1 spreads and spreads a self-propelled vehicle main body 10 and a pavement material supplied to the construction surface S, and spreads and leveles the pavement material, and a plurality of vibrators 30 for compacting the pavement material. And a mold 40 that molds the paving material into a predetermined cross section. Further, as shown in FIG. 2, the construction machine 1 includes a proximity sensor 50 attached to the drive motor 31 of the vibrator 30, and a tachometer 60 that displays the rotation speed of the output shaft 31 a of the drive motor 31. Yes. In the construction machine 1, a proximity sensor 50 and a tachometer 60 are provided for each vibrator 30.

The vehicle body 10 includes a frame 11 and four front and rear crawler traveling bodies 12. A support column 12 a is vertically provided on the upper surface of each crawler traveling body 12.
On the frame 11, a cockpit (not shown) is provided. A control device (not shown) for controlling driving of the crawler traveling body 12, the spreader 20, the vibrator 30, and the like is provided in the cockpit.

The frame 11 includes a pair of left and right first frames 11a extending in the front-rear direction, and a pair of front and rear second frames 11b spanning the left and right first frames 11a.
Both front and rear end portions of the first frame 11a are attached to the columns 12a of the front and rear crawler traveling bodies 12. The frame 11 is supported at a predetermined height by front, rear, left and right crawler traveling bodies 12.

  The mold 40 is a member that molds the paving material on the construction surface S into a predetermined cross section. The mold 40 includes a pair of left and right end plates 41 disposed between the left and right first frames 11 a and a screed 42 disposed between both end plates 41.

The end plate 41 is a vertical plate that defines the width of the pavement. The end plate 41 extends in the front-rear direction, and the upper end edge is attached to the lower surfaces of the front and rear second frames 11b.
The screed 42 is a cylindrical member having a rectangular cross section that defines the height of the pavement. The screed 42 extends in the left-right direction, and both left and right end portions are attached to the inner side surfaces of the left and right end plates 41. The lower surface of the screed 42 is arranged parallel to the construction surface S with a space therebetween.

The spread leveling device 20 is disposed below the frame 11 and includes an auger 21 that spreads the pavement material supplied to the construction surface S to the left and right.
The auger 21 includes a screw shaft 21a extending in the left-right direction and a helical screw blade 21b attached to the outer peripheral surface of the screw shaft 21a. The auger 21 is disposed in front of the screed 42, and both left and right end portions of the screw shaft 21a are rotatably supported by the left and right frames of the mold 40.

  A motor (not shown) for rotating the auger 21 is accommodated in the screed 42 of the mold 40, and the driving force of the motor is driven by a screw shaft 21a by a drive transmission mechanism (not shown) such as a chain or a belt. Is transmitted to.

  The vibrator 30 is a device that imparts vibration to the pavement material spread on the construction surface S and compacts it. In this embodiment, the some vibrator 30 is arrange | positioned ahead of the auger 21, and each vibrator 30 is arrange | positioned at intervals in the left-right direction.

  As shown in FIG. 2, the vibrator 30 includes a drive motor 31, a holder 32 that holds the drive motor 31, an upper casing 33 that is disposed above the holder 32, and a lower casing that is disposed below the holder 32. 34 and an eccentric weight 35 accommodated in the lower casing 34.

The drive motor 31 is a hydraulic motor, and includes a hollow case 31b in which a drive mechanism such as a gear is accommodated, and an output shaft 31a protruding from the lower surface of the case 31b.
A supply hose 36 and a discharge hose 37 are extended from the upper end surface of the case 31b. Moreover, as shown to Fig.3 (a), the screw hole 31d to which the proximity sensor 50 mentioned later is attached penetrates the upper end wall part 31c of case 31b.

  The supply hose 36 is connected to a pump (not shown) provided in the vehicle main body 10 (see FIG. 1). The discharge hose 37 is connected to a tank (not shown) provided in the vehicle main body 10 (see FIG. 1).

  The drive motor 31 is configured such that the hydraulic oil is supplied to the drive mechanism in the case 31b through the supply hose 36, and the output shaft 31a is rotated by discharging the hydraulic oil from the drive mechanism through the discharge hose 37. ing.

In the case 31b, a rotating body 31f that rotates in conjunction with the rotation of the output shaft 31a (see FIG. 2) is disposed at a position facing the inner opening 31e of the screw hole 31d.
The rotating body 31f is a member having a circular cross section, the upper end face is opposed to the inner opening 31e of the screw hole 31d, and the lower part is connected to the output shaft 31a via a drive transmission mechanism such as a gear.

  A concave groove 31g formed in the radial direction is formed on the upper end surface of the rotating body 31f. Thereby, the upper end part of the rotary body 31f is divided with the concave groove 31g interposed therebetween, and two detected parts 31h having the same shape are formed.

  As shown in FIG. 2, the holder 32 is a cylindrical member through which a mounting hole 32 a passes vertically. A case 31b of the drive motor 31 is fitted in the upper part of the mounting hole 32a, and an output shaft 31a is accommodated in the lower part of the mounting hole 32a. The upper end portion of the case 31b protrudes from the upper end opening portion of the mounting hole 32a.

The upper casing 33 is a cylindrical member whose lower portion is bent rearward, and is supported by the vehicle body 10 (see FIG. 1) via a vibration absorbing member such as a rubber member or a coil spring (not shown). Yes.
A lower end opening of the upper casing 33 is fitted on the upper end of the holder 32, and the holder 32 and the drive motor 31 are attached to the lower end of the upper casing 33. A supply hose 36 and a discharge hose 37 are inserted into the upper casing 33.

  The lower casing 34 is a bottomed cylindrical member, and an upper end opening is externally fitted to the lower end of the holder 32. That is, the lower casing 34 is attached to the lower end portion of the holder 32.

The eccentric weight 35 is a linear member accommodated in the lower casing 34. Both end portions of the eccentric weight 35 are formed in a circular cross section, and support shafts 35 a are respectively provided on both end surfaces of the eccentric weight 35.
Both support shafts 35a are disposed on the same axis, and both support shafts 35a are rotatably supported by two bearings 35b fitted in the lower casing 34. The upper support shaft 35a is connected to the output shaft 31a. As described above, the eccentric weight 35 is configured to rotate in the lower casing 34 in conjunction with the rotation of the output shaft 31a, with the both support shafts 35a serving as the rotation shafts.

The intermediate portion of the eccentric weight 35 in the axial direction has a substantially semicircular cross section, and the position of the center of gravity is deviated from the axis of the two support shafts 35a (rotating shaft). Therefore, when the output shaft 31a is rotated, the eccentric weight 35 rotates eccentrically.
Then, the eccentric weight 35 rotates eccentrically in the lower casing 34, and thus vibration occurs in the lower casing 34 and the case 31b.

As shown in FIG. 3A, the proximity sensor 50 detects the detected portion 31h by the detecting portion 51 and outputs a detection signal to a tachometer 60 described later.
A male screw 52 is formed on the outer peripheral surface of the proximity sensor 50. The proximity sensor 50 is fixed to the upper end wall portion 31c of the case 31b by the male screw 52 being screwed into the screw hole 31d of the case 31b.

  A detection unit 51 is formed at the lower end of the proximity sensor 50, and the detection unit 51 protrudes from the inner opening 31e of the screw hole 31d into the case 31b. The lower surface of the detection unit 51 is opposed to the upper end surface of the rotating body 31f (detected portion 31h). Moreover, the detection part 51 has shifted | deviated to radial direction with respect to the center position of the rotary body 31f.

  A cable 52 extends from the upper end surface of the proximity sensor 50. As shown in FIG. 2, the cable 52 is inserted into the upper casing 33 and is connected to a tachometer 60 described later. Thus, the proximity sensor 50 and the tachometer 60 are electrically connected by the cable 52.

  As shown in FIG. 3A, the detection unit 51 is set so as to detect the upper surface of the detected portion 31h and not the bottom surface of the concave groove 31g. That is, when the concave groove 31g passes directly below the detection unit 51 and the detection unit 31h is disposed directly below the detection unit 51, the detection unit 31h is detected by the detection unit 51, and the rotation described later from the proximity sensor 50 is performed. A detection signal is output to a total of 60 (see FIG. 2).

  The structure of the proximity sensor 50 is not limited, and various proximity sensors can be used. In the slip form method, a hard pavement material is used to maintain the cross-sectional shape of the pavement after the mold 40 (see FIG. 1) has passed. For this reason, the vibration applied from the vibrator 30 to the pavement is increased by rotating the output shaft 31a shown in FIG. Therefore, in the present embodiment, the proximity sensor 50 that allows the detection unit 51 to accurately detect the detected portion 31h even when the output shaft 31a is rotated at 10,000 rotations or more per minute is used.

  The tachometer 60 displays the rotation speed of the output shaft 31a of the drive motor 31, and includes a rotation speed calculation means 61 that converts the detection signal output from the proximity sensor 50 into the rotation speed of the output shaft, and rotation speed calculation. Display means 62 which is a monitor for displaying the rotation speed of the output shaft 31a calculated by the means 61. Each process in the tachometer 60 is performed by the CPU executing a program stored in a storage means (not shown).

  In the rotation speed calculation means 61, the number of detection signals output from the proximity sensor 50 each time the output shaft 31a rotates once is set in advance. Then, the rotation speed calculation means 61 calculates the rotation speed of the output shaft 31 a based on the number of detection signals output from the proximity sensor 50 per unit time, and outputs the rotation speed to the display means 62. . In this way, the rotation speed calculation means 61 converts the detection signal output from the proximity sensor 50 into the rotation speed of the output shaft 31a.

  When constructing a pavement body on the construction surface S shown in FIG. 1 by the construction machine 1 of the present embodiment, first, from the transport vehicle (not shown) arranged on the side of the construction surface S onto the construction surface S. Supply paving materials. In addition, on the construction surface S, reinforcing bars, meshes, joint materials and the like (not shown) are arranged in advance.

  Simultaneously with the supply of the pavement material to the construction surface S, the construction machine 1 is advanced and travels with the transport vehicle. Then, while the construction machine 1 is advanced, the paving material is spread on both the left and right sides by the auger 21 of the spread leveling device 20.

  At this time, the lower casing 34 of each vibrator 30 is inserted into the pavement in front of the auger 21. Then, as shown in FIG. 2, by rotating the output shaft 31a of the drive motor 31 and vibrating the lower casing 34, the vibration is applied to the pavement material, and the pavement material is compacted.

  As shown in FIG. 3A, when the rotating body 31f rotates in conjunction with the output shaft 31a, the detection unit 51 of the proximity sensor 50 detects the detected part 51h of the rotating body 31f. Then, as shown in FIG. 2, a detection signal is output from the proximity sensor 50 to the rotation speed calculation means 61. The rotation speed calculation means 61 converts the detection signal into the rotation speed of the output shaft 31 a and outputs the rotation speed to the display means 62.

  Based on the number of rotations of the output shaft 31a displayed on the display means 62, the operator can vibrate vibration of each vibrator 30 so that vibration suitable for compacting the pavement material is applied from each vibrator 30 to the pavement material. to manage.

  As shown in FIG. 1, the pavement material compacted by each vibrator 30 is spread and leveled by the screed 22 and molded into a predetermined cross section by the mold 40, thereby constructing a pavement having the same cross section.

  In the construction machine 1 as described above, as shown in FIG. 3A, the detected part 31h of the rotating body 31f that rotates is directly moved by the proximity sensor 50 in conjunction with the rotation of the output shaft 31a (see FIG. 2). Since the rotation speed of the output shaft 31a is calculated based on the detection result, the detection accuracy of the rotation speed of the output shaft 31a can be improved. Therefore, in the construction machine 1, the vibration of the vibrator 30 can be managed accurately, and the quality of the pavement can be maintained.

  Moreover, in the construction machine 1, since the rotation speed of the output shaft 31a can be calculated from the number of detection signals output from the proximity sensor 50 per unit time, the calculation process in the tachometer 60 shown in FIG. 2 is simplified. The manufacturing cost of the tachometer 60 can be reduced.

  Moreover, in the construction machine 1, since the proximity sensor 50 and the tachometer 60 are provided for each vibrator 30, the structure of the tachometer 60 can be simplified, and the manufacturing cost of the tachometer 60 can be reduced. .

The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention.
In the construction machine 1 of the present embodiment, as shown in FIG. 3A, the detected part 31h of the rotating body 31f in the case 31b is detected by the proximity sensor 50, but the configuration of the detected part 31h is limited. Is not to be done. For example, the detection unit 51 may detect a detected part that reciprocates in the case 31b in conjunction with the rotation of the output shaft 31a (see FIG. 2).

  Moreover, in the construction machine 1 of this embodiment, as shown in FIG. 1, a plurality of vibrators 30 are provided, but the number of vibrators 30 is not limited, and the material of the paving material and the construction surface S are not limited. It is set appropriately according to the width.

  Moreover, in the construction machine 1 of this embodiment, as shown in FIG. 2, although the hydraulic motor is used as the drive motor 31 of the vibrator 30, the structure is not limited and an electric motor may be used. .

  Moreover, in this embodiment, as shown in FIG. 1, although the construction machine 1 used for a slip form construction method is demonstrated, the construction machine of this invention is applicable to various construction methods.

DESCRIPTION OF SYMBOLS 1 Construction machine 10 Vehicle main body 11 Frame 12 Crawler traveling body 20 Spreading leveling device 21 Auger 30 Vibrator 31 Drive motor 31a Output shaft 31b Case 31f Rotating body 31g Concave groove 31h Detected part 32 Holder 33 Upper casing 34 Lower casing 35 Eccentric weight 40 Mold 41 End plate 42 Screed 50 Proximity sensor 51 Detecting part 51h Detected part 60 Tachometer 61 Rotational speed calculating means 62 Display means S Construction surface

Claims (2)

A vibrator that compacts the pavement material;
A proximity sensor provided in the vibrator;
A tachometer that displays the rotation speed of the output shaft of the drive motor of the vibrator,
An eccentric weight is accommodated in the casing of the vibrator,
The proximity sensor is fixed to a wall portion of the case of the drive motor,
Detector of the proximity sensor protrudes into said casing,
The detection unit detects a detected unit that rotates or reciprocates in conjunction with the output shaft in the case,
The construction machine according to claim 1, wherein the tachometer has a rotation speed calculation means for converting a detection signal output from the proximity sensor into a rotation speed of the output shaft. The construction machine is provided with a plurality of the vibrators,
The construction machine according to claim 1, wherein the proximity sensor and the tachometer are provided for each vibrator.

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