JPH07233643A - Longitudinal tilt control mechanism for concrete leveling device - Google Patents

Abstract

PURPOSE:To invariably keep a level section longitudinally horizontal by erecting light receivers at the front and rear across the fulcrum of the longitudinally rotatable concrete level section. CONSTITUTION:Light receivers 21F, 21R are held and erected at the same height on hold sections 20b, 20c located at the front and rear across the pivotal support section 6a of an upper cover 6 respectively. The height is set in advance so that the height of the rotor lower end section of a concrete level section B and a tamper 30 at the time of depression is made equal to the target concrete surface height when the light from a light projector is received on the reference line L. When the concrete level section B is tilted to the right or left with the sides of the rotor and tamper 30 faced upward, a lift cylinder 19 on this side is shrunk, and the side of the concrete level section B is lowered to make it horizontal on the right and left. When the concrete level section B is longitudinally tilted, a cylinder rod 9b is expanded/shrunk by the motor 9a of a longitudinally horizontal cylinder 9 in response to the drift width, and the upper cover 6 is longitudinally rotated to make the concrete level section B horizontal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete leveling device for leveling a concrete pouring surface such as a floor surface or a road surface of a building when pouring concrete.

[0002]

2. Description of the Related Art Conventionally, there has been known a concrete leveling apparatus in which a concrete leveling section equipped with a rotator and a tamper for leveling concrete to be cast on a traveling machine body is vertically movable. Furthermore, the applicant has made it possible to automatically adjust the height of the sleds supporting the concrete leveling parts on the left and right sides of the concrete leveling part independently by an actuator such as an electric cylinder. A light receiver is erected on each side, and it receives the light emitted from a projector at a remote place and showing a reference line with a certain height, and drives the actuator based on the deviation from the reference line to adjust the height of each side. The sled body that supports the concrete leveling part with respect to the main body of the concrete leveling part is adjusted so that the tamper comes into vertical contact with the concrete surface during the left-right adjustment. A patent application has been filed for the invention of a concrete leveling device configured to move up and down horizontally in the front-rear direction.

[0003]

However, the invention according to the above-mentioned patent application is capable of detecting and controlling the inclination of the concrete leveling part in the left-right direction, and is slidable in the front-rear horizontal direction with respect to the concrete leveling part. Although the body can be raised and lowered, the concrete leveling part itself may tilt forward and backward, and the tilt in the front-back direction in this case is not detected and controlled. Therefore, the front and rear inclination of the concrete leveling portion may cause the concrete surface after the leveling work to be in a wavy state. Even if a new photodetector is provided to detect the front-back inclination of the concrete leveling device, the photodetector is expensive, which leads to an increase in the price of the device itself.

[0004]

In order to solve the above problems, the present invention has the following structure. That is, in a concrete leveling device equipped with a traveling machine body, a concrete leveling section including a rotating body for leveling a cast concrete surface, a tamper, and a sled body for supporting the rotating body and the tamper on the left and right sides. Two light receivers, which receive light from a light projector at a remote place set to a constant height, were erected on the concrete leveling section with their front and rear positions being shifted.

In the concrete leveling device, the concrete leveling portion is mounted on the traveling machine body so as to be rotatable back and forth, and its rotation fulcrum is arranged between the front and rear light receivers in a side view, and Both light receivers were arranged on the left and right sides of the concrete leveling section.

Further, in the concrete leveling apparatus, an actuator is provided for rotating the concrete leveling portion which can be rotated back and forth based on the light detection of the light receiver.

[0007]

By arranging two light receivers on the left and right sides of the concrete leveling part by shifting the positions in the front and rear, the front and rear inclination and the left and right inclination of the concrete leveling part can be detected only by the two light receiving devices. Therefore, the two light receivers for detecting the heights of the left and right sides of the conventional concrete leveling section may be used as they are. In addition, since the front-rear rotation fulcrum of the concrete leveling part is arranged between the left and right receivers, if the height of light from the projector detected by the front and rear receivers is different between the two receivers, the actuator Drive the concrete leveling part back and forth around the rotation fulcrum, and if the heights of the light detected by both light receivers match, the leveling part of the concrete is horizontal and the actuator Stop driving. In this way, the automatic front-rear horizontal adjustment of the concrete leveling part is performed.

[0008]

The problems and configurations to be solved by the present invention are as described above, and the embodiments of the present invention shown in the accompanying drawings will be described below. 1 is an overall side view of the concrete leveling apparatus, FIG. 2 is an overall plan view of the same, FIG. 3 is a side view of the concrete leveling section B, FIG. 4 is an automatic horizontal control flowchart of the concrete leveling section B, and FIG. 5 is the same. It is an automatic horizontal control flowchart.

A traveling machine body A of the concrete leveling apparatus will be described with reference to FIG. In the traveling body A, the engine E is mounted on the chassis 49.
A mission case M is arranged at the rear part. And
A transmission case 50 is provided between the engine E and the transmission case M, and in the transmission case 50, a pulley on an output shaft of the engine E and an input shaft arranged above the transmission case M. The belt is wound between the pulley. Further, the lower end portion of the mission case M is constructed such that the axle 1 of the traveling wheel W is mounted on the lower end portion thereof to drive the traveling wheel W. A steering handlebar 51 capable of changing the front-rear direction is placed on the upper part of the mission case M, and a main clutch lever 52 and the like are attached to the steering handlebar 51.

A concrete leveling section B is installed behind the traveling machine body A as described above. That is, as shown in FIGS. 1 to 3, on the left and right side surfaces of the mission case M and on the axle 1 that supports the transmission case M, a lower parallel link 2a for raising and lowering the leveling portion is formed.
2b are pivotally supported in a pair of left and right to project rearward, and the rear ends of the lower parallel links 2a and 2b project from a horizontal tool bar 4 at the front end of the concrete leveling section B. It is pivotally supported at the front ends of the front support plates 5, 5 so that the concrete leveling part B can be raised and lowered horizontally with respect to the traveling machine body A. Further, a suspension mast 3 is provided so as to project from the rear portion of the mission case M to the upper rear portion, and the lower end portion is pivotally supported by a pivotal support portion 6a provided on an upper portion of an upper cover 6 extending rearward from the tool bar 4. Rear lift rod 7b
The upper part of the suspension mast 3 is slidably fitted into a fitting insertion hole at the rear end of the suspension mast 3 via a spring, and a fitting insertion hole is formed near the base of the suspension mast 3. A front lift rod 7a is slidably inserted into the suspension mast 3 via a spring so as to be slidable to some extent, and a lower end portion of the support plate 4a protrudes forward from the toolbar 4. Is pivoted to. In this way, when the steering handle 51 of the traveling machine body A is pushed down at the time of changing the direction, the concrete leveling part B is lifted upward away from the concrete surface so that the direction can be changed. The lift rods 7a and 7b can be slid up and down to some extent so as to soften the shock when the concrete leveling portion B is grounded on the concrete surface.

In the concrete leveling portion B mounted on the traveling machine body A as described above, the lift rods 7a, 7b
Since it is slidable to a certain extent, it is supported by the traveling machine body A via the lower parallel links 2a and 2b, but the upper cover 6 can rotate back and forth to some extent with the pivotal support portion 6a as a rotation fulcrum. When the upper cover 6 is rotated back and forth with the pivotal support portion 6a as a rotation fulcrum, the entire concrete leveling portion B is rotated back and forth. On the contrary, when the concrete leveling part B is inclined forward and backward with respect to the concrete surface, the upper cover 6 can be turned back and forth to be returned to the horizontal state by using the pivot point 6a as a turning point. Therefore, the cylinder pivot part 8 is arranged at the rear part of the mission case M of the traveling machine body A, while the cylinder pivot part 6b is projectingly provided on the upper part of the upper cover 6 so that the electric motor is provided between the cylinder pivot parts 6b. A front-rear horizontal cylinder 9 that drives the cylinder rod 9b to extend and retract by driving 9a is pivotally mounted, and when the concrete leveling section B is inclined forward and backward, the front-rear horizontal cylinder 9 extends and retracts to rotate the upper cover 6 forward and backward. By doing so, it returns to the horizontal state.

Next, the concrete leveling portion B will be described with reference to FIGS. 1 to 3. Side covers 10, 10 are vertically arranged on both sides of the upper cover 6. A fixed link bracket 11 is fixedly installed in a vertical shape on the front ends of the side covers 10 and 10. The fixed link bracket 11 is U-shaped in a plan view, and the front ends of an upper link 12 and a lower link 13, which are parallel links for lifting and pulling a sled, are fitted and pivotally supported in the groove. The rear end portions of the upper and lower links 12 and 13 are fitted into the groove of the movable link bracket 14 having a U-shape in a plan view and pivotally supported. The movable link bracket 14 is not fixed to the side cover 10. On the other hand, a U-shaped roller rail 17 in a plan view is fixedly provided at the rear end of the side cover 10 and the rollers 16 and 16 of the roller rail 17 are fixed from the rear end of the movable link bracket 14. It fits in the groove so that the rollers 16 and 16 can slide vertically in the groove of the roller rail 17, that is, the movable link bracket 14 can slide vertically with respect to the roller rail 17. It has become. Since the vertical movement of the movable link bracket 14 draws a rotation locus with the fixed link bracket 11 as a fulcrum, the roller 16 in the groove of the roller rail 17 has a width that allows it to move back and forth.

On the other hand, the sleds 18, 18 are hung vertically below the concrete leveling section B and abutted on the reinforcing bars T below the surface of the cast concrete to maintain the straightness of the concrete leveling section B. Is supported by the support arm 18a,
As shown in FIG. 3, the vertical portion of the rear portion of the support arm 18a and the upper end portion thereof are fitted into the groove of the movable link bracket 14 from below and fixed to the movable phosphorus bracket 14 at the side of the lower link 13. There is. With such a configuration, the upper link 12 and the lower link 13 rotate vertically in parallel with the fixed link bracket 11 side as a fulcrum, and the support arm 18a is fixed to the movable link bracket 14 to be integrated. The sled body 18 is configured to move up and down. When the sled body 18 is moved up and down, the ground contact surface of the sled body 18 is always parallel to the concrete surface, that is, horizontal. Part B
No longer leans back and forth.

The lifting / lowering drive of the sled body 18 which can be lifted / lowered in this manner is based on the expansion / contraction drive of the electric lifting / lowering cylinder 19. That is, the elevating frames 20 and 20 are erected on the outer side surfaces of the left and right side covers 10 and the cylinder pivot portions 20a and 20a protruding from the elevating frames 20 and 20 are provided.
The upper ends of the lifting cylinders 19L and 19R are pivotally supported on a in such a manner that they can swing back and forth. And the lifting cylinder 19
The lower end of the L / 19R cylinder rod 19b is pivotally supported by a cylinder rod pivot portion 15 projecting from the movable link bracket 14. Both lift cylinders 19
An electric motor 19a is attached to the upper portion of L / 19R, and the electric motor 19a is driven to extend and retract the cylinder rod 19b.

Of the left and right elevating frames 20, 20, a holding portion 20b is provided in front of the elevating frame 20 on one side (the left side in the embodiment) and the opposite side (the right side in the embodiment).
A holding portion 20c is provided so as to project rearward from the elevating frame 20 and the light receiving device 21 is provided on each of the holding portions 20b and 20c.
The F ・ 21R is sandwiched and set up at the same height. It should be noted that both the sandwiching portions 20b and 20c are positioned in front and back with the pivotal support portion 6a of the upper cover 6 sandwiched therebetween in a side view. A control box 22 having a built-in controller is installed in the center of the upper cover 6. The lifting cylinder 19
The L / 19R is controlled by the light receivers 21F and 21R standing upright on the left and right of the upper cover 6, detecting light from a light projector standing upright at a fixed position in the work place (not shown), and on the left and right sides of the concrete leveling section B. Based on detecting the ground position of. That is, the light receivers 21F and 21R that receive the light from the light projector
However, when the deviation of the vertical position of the light is detected, the control box 22 corrects the deviation of the left and right electric motors 1.
A driving signal is transmitted to 9a and 19a, and the left and right lifting cylinders 19L and 19R are respectively driven to extend and retract to raise and lower the sled body 18 to the set ground height. As a result, the horizontal level of the concrete leveling part B is maintained.

The heights of the light receivers 21F and 21R are such that when the height of light from the light projector is received at the reference line L in advance, the concrete lowering portion 24 of the concrete leveling portion B and the tamper 30 will be described later.
The height is set so that the pressure at the time of pressing becomes the target concrete surface height, and is sandwiched by the sandwiching portions 20b and 20c. When the height of light received by the light receiver 21L or 21R is higher than the reference line L, the side of the concrete leveling section B on which the light receiver 21 is erected is higher than the target concrete surface height. That is, the rotating body 2
4 and the tamper 30 are inclined leftward and rightward with the side thereof facing upward, so that the elevating cylinder 19 on that side is contracted to lower that side of the concrete leveling part B, and the rotating body 24 and the tamper 30. Set 30 horizontally. On the other hand, when the height of the light received by the light receiver 21 is lower than the reference line L, the elevating cylinder 19 on that side is extended to raise that side of the rotating body 24 and the tamper 30 to correct the lateral inclination. To do.

Further, as shown in FIG. 1, as the concrete leveling part B is inclined forward and backward, the left and right (front and rear) light receivers 21F and 21R have different upper end heights. Here, as described above, since the front-back rotation fulcrum of the concrete leveling part B is the pivotal support part 6a of the upper cover 6,
At the time of the forward / backward inclination, the height of the light received by the light receiver 21F on the front side and the light receiver 21R on the rear side is shifted up and down from the reference line L. The light receiver 21F ′ · 21 shown by the broken line in FIG.
The position of R'is when the concrete leveling part B is inclined with the rear side facing down, and at this time, the light received by the front light receiver 21F 'is higher than the reference line, and the light of the rear light receiver 21R' is higher. Is lower than the reference line (the opposite is true when the front is tilted downward). At this time, from the controller of the control box 22, the front-rear horizontal cylinder 9
An output signal is sent to the electric motor 9a, the cylinder rod 9b is driven to expand and contract, the upper cover 6 is rotated back and forth to return to the horizontal state, and the drive of the cylinder rod 9b is stopped at the horizontal state. Light receiver 21F '・ 21
When represented by R ', since the front portion is inclined upward, the front-rear horizontal cylinder 9 is driven to contract and the upper cover 6 is rotated forward. In the opposite case, the cylinder is extended to rotate the upper cover 6 backward. In this way, the front-rear horizontal state of the concrete leveling part B is maintained.

Automatic horizontal control by driving the elevating cylinders 19L and 19R and the front-rear horizontal cylinder 9 based on the light detection of the above-mentioned light receivers 21F and 21R will be described with reference to the flowcharts of FIGS. In the figure, "shi 9" represents the front-rear horizontal cylinder 9, "shi 19L" represents the left lifting cylinder 19L, and "shi 19R" represents the right lifting cylinder 19R. First, in FIG. 1, each light receiver 2
The vertical deviation widths of the light from the projector received by the 1F and 21R from the reference line L are set to "X" and "Y", respectively. When each of the light receivers 21F and 21R receives light at the height of the reference line,
When X = 0 and Y = 0, each of which is higher than the reference line L is "positive", and when it is lower than the reference line L, "negative". Then, the controller in the control box 22 reads the X and Y values and compares them.

As a result of the reading, if both X and Y have the same positive or negative value, the concrete leveling portion B is vertically displaced while keeping the front-rear, left-right, and horizontal positions. Therefore, as shown in FIG. The left and right elevating cylinders 19L and 19R are evenly extended and retracted to move the concrete leveling portion B up and down in a horizontal state, and the cylinder drive may be stopped when both X and Y become "0".

The problem is when there is a difference between the X and Y values. This is because both X and Y are "positive" or "negative", or one of X and Y is "0" and one is "positive".
Or in the case of "negative", or one of X and Y is "positive"
There are three cases where one of them is “negative”. In any case, whether the difference is due to the left-right inclination of the concrete leveling part B or the front-rear inclination. It's hard to tell. Here, it is one of the concrete leveling parts B that causes the left-right inclination, that is, the light receiver 21F.
In many cases, one side of 21R moves up and down, and therefore, the difference between X and Y is often caused by an increase or decrease in the value of either side. On the other hand, in the case of tilting forward and backward,
The light receiver on one side rotates upward and the light receiver on the other side rotates downward with the pivotal support portion 6a serving as a rotation fulcrum interposed therebetween. Therefore, the difference between X and Y tends to be large because both values increase or decrease in positive and negative directions.

As described above, when the difference between X and Y is large, the tendency due to the front-back inclination is strong, so that the difference between X and Y is larger than the constant value K (| X−Y |> K). In this case, an output signal is sent to the electric motor 9a to drive the front-rear horizontal cylinder 9 to expand and contract, and the concrete leveling portion B is rotated back and forth on the side of the light receiver having the larger value of X and Y. That is, as shown in FIG. 4, if the value of X is larger, the front light receiver 21F side is above, so the front-rear horizontal cylinder 9
And the concrete leveling part B may be rotated forward. If the Y value is larger, the rear light receiver 21R
Since the side is the upper position, the concrete leveling portion B is rotated backward by the extension of the front-rear horizontal cylinder 9.

Then, as shown in FIG. 5, when the difference between X and Y is a constant value K or less (| X−Y | ≦ K), it is considered that the left and right of the concrete leveling part B is due to the left and right inclination. Either lift cylinder 19L or 19R, or both, X
-Expansion / contraction drive so that both Y values are set to 0, and the concrete leveling part B is tilted to the left or right, or the concrete leveling part B is
Correct the vertical movement of the whole. Even when the difference between X and Y becomes smaller than K due to the expansion and contraction of the front-rear horizontal cylinder 9, the front-rear horizontal cylinder 9 stops and it becomes impossible to correct the front-rear tilt further. Within the range, the front-back inclination angle of the concrete leveling part B is also allowed, and the left and right lifting cylinders 19L ・ 1
Only the left / right tilt control by 9R is used.

Next, the rotating body 24 of the concrete leveling section B
The configuration of the tamper 30 will be described. First, the rotating body 24 will be described. The bearings 25, 25 are arranged on the lower central portions of the side frames 9, 9 respectively.
A rotary shaft 24a is pivotally supported between 25. Blades 24b, 24b, which are made of an iron plate or the like, are provided on the rotary shaft 24a so as to even out the surface of the concrete in a radial manner. In the vicinity of both bearings 25, 25, side plates 24c ,. 24c. By rotating the rotator 24 having such a structure, the blades 24b scrape the excess concrete on the concrete surface forward or backward to reach the desired concrete surface height.

Next, the tamper 30 will be described. The tamper 30 is a member for reciprocating up and down to strike and even out the surface of the concrete that is scraped to a set thickness by the rotating body. An upper rotation fulcrum shaft 26 is laterally installed between both side covers 10 and upper links 28, 28 are rotatably projected rearward of the upper rotation fulcrum shaft 26. The lower rotation fulcrum shafts 27, 27 project inward at the lower rear end of 10, and the lower links 29, 29 rotatably project rearward of the lower rotation fulcrum shaft 27. The rear ends of the left and right upper links 28 and the lower links 29 are attached to the mounting plates 30a, 30a of the tamper 30.
The tamper 30 is urged downward by springs 31 and 31 which are attached to the lower pivoting fulcrum shafts 27 on the left and right of the tamper side pivot shafts of the left and right upper links 28. Then, a vibrating arm 32 is projected forward from the left side of the upper turning fulcrum shaft 26, a front end of the vibrating arm 32 is brought into contact with a cam 33 described later, and the vibrating arm 32 is slid back and forth by rotation of the cam 33. When the tamper 30 moves, the tamper 30 reciprocates vertically through the vertical links 28 and 29. A balancer 34 for balancing the weight of the vibration arm 32 is attached to the right side of the upper rotation fulcrum shaft 26.

The members for assisting the concrete leveling work by the rotating body 24 and the tamper 30 will be described. First, at the inner portions of the left and right side covers 10, 10, concrete width adjusters 23, 23 are provided in front of the upper part of the toolbar 4 in the left and right directions. The concrete width adjuster 23 moves the concrete to the inner side of the left and right width of the rotating body 24 so that the concrete left unbalanced on the left and right of the rotating body 24 does not overflow during the leveling work by the rotating body 24. , To give a good leveling effect. The concrete width adjuster 23 has an adjusting portion 23a.
The vertical height can be adjusted by adjusting the screw position of. A rear rubber cover 35 extends from the rear end of the upper cover 6 to the front of the tamper 30 to cover the rear portion of the rotating body 24. Scattering prevention and the rotating body 2
We are trying to incorporate concrete into No. 4. Further, the tamper 30 is a flat plate in the shape of a wire mesh, and a mesh is attached to the concrete surface by the pressing force of the tamper 30, so a rubber drip 36 is extended at the rear part of the tamper 30, and the mesh is separated from the rubber. The drips 36 are designed to be erased by running on the concrete surface.

The transmission system of the concrete leveling section B will be described. A PTO shaft 37 is provided so as to project from the right side of the input shaft position in the transmission case M of the traveling body A, and the chain 3 is attached to the sprocket 38 behind the PTO shaft 37.
9 is wound and covered with the transmission case 40. The center axis of the sprocket 38 is inserted into a gear case 41 fixed to the side of the transmission case 40, and the drive shaft 42 is projected leftward from the gear case 41, while the left side cover 10 is provided. In this case, a chain case 45 for driving the rotating body 24 is fixed in an upright shape. In the chain case 45, the central axis of the lower sprocket 48 is the side cover 1 on the left side.
The shaft 25 of the rotary body 24
a is formed. Further, the chain 47 is wound around the upper sprocket 46 from the lower sprocket 48,
The central shaft 44 of the upper sprocket 46 is projected. Then, the drive shaft 42 protruding from the gear case 41
The central shaft 44 of the upper sprocket 46 is connected by the universal joint shaft 43.

Further, the cam 33 is fixedly mounted on the central shaft 44 of the upper sprocket 46 of the chain case 45, and the front end of the vibrating arm 32 is in contact with the cam 33 as described above. The oscillating arm 32 slides back and forth in accordance with the rotation of the cam 33 accompanying the rotation of the central shaft 44 to vertically oscillate the tamper 30. A shift lever 41a is provided on the gear case 41 so that the drive shaft 4 can be rotated by operating the shift lever 41a.
The rotation speed of the rotary body 24 and the vertical vibration speed of the tamper 30 can be changed by changing the rotation speeds of the center shaft 44 and the center shaft 44.

The rotating body 24 and the tamper 30 of the concrete leveling section B which are driven as described above have their supporting heights changed according to the change of the thickness of the poured concrete or the like, and the horizontal inclination of the concrete leveling section B is corrected. Then, the vertical height is automatically adjusted so as to set the leveled concrete surface to the set height, and the vertical height is adjusted by expanding and contracting the lifting cylinder 19. It is configured such that it is moved up and down by 18. As described above, the sled body 18 is held in the front-rear horizontal state by the configuration of the parallel links 12 and 13 during the elevating drive, and further, when the sled body 10 is elevated and lowered, the entire concrete leveling portion B is Since it is connected to the traveling machine body A through the lower parallel links 2a and 2b, it can move up and down while maintaining the front-rear horizontal shape. Therefore, the tamper 30 supported behind the concrete leveling section B can be used.
The ground contact surface of the car will be adjusted vertically while maintaining the front-back horizontal shape. Further, in order to alleviate shocks when the concrete leveling part B is lifted upward, the lift rod 7 can be slid to some extent, so that the upper cover 6 tilted back and forth about the pivotal support part 6a is used as a receiver. Since the front and rear horizontal cylinders 9 are driven to be held horizontally by receiving light, it is possible to maintain an accurate leveling operation in which the tamper 30 vertically presses the concrete surface even during the leveling operation.

[0029]

The present invention has the following effects by being configured as described above. That is, by arranging the light receivers in front of and behind with the front and rear rotation fulcrum of the concrete leveling part that can be rotated back and forth, the front and back inclination of the concrete leveling part can be detected by the two light receivers. Based on this, the actuator that rotates the concrete leveling part back and forth can be driven to correct the front and rear inclination, and the concrete leveling part can be held horizontally during the leveling work. The concrete surface will not become wavy after the work, and accurate and efficient concrete leveling work can be obtained. Also, the light receivers that are moved back and forth are placed on both sides of the concrete leveling section,
The two light receivers for controlling the left and right inclination can be used as they are, there is no need to provide a new light receiver for the front-rear horizontal control, and there is no fear of cost increase.

[Brief description of drawings]

FIG. 1 is an overall side view of a concrete leveling device.

FIG. 2 is likewise an overall plan view.

FIG. 3 is a side view of a concrete leveling section B.

FIG. 4 is a flow chart of automatic horizontal control of a concrete leveling section B.

FIG. 5 is likewise a flow chart of automatic horizontal control.

[Explanation of symbols]

 A Traveling aircraft B Concrete leveling part M Mission case W Wheels 3 Suspended mast 6 Upper cover 6a Pivot part 6b Cylinder pivot part 7a Front lift rod 7b Rear lift rod 9 Front-rear horizontal cylinder 18 Sliding body 19L ・ 19R Lifting cylinder 20 Lifting frame 20a Cylinder pivot 20b ・ 20c Clamping part 21F ・ 21R Light receiver

Claims (3)

[Claims] 1. A concrete leveling section having a traveling level body provided with a concrete leveling section including a rotating body for leveling the surface of the cast concrete, a tamper, and a sled body for supporting the rotating body and the tamper on the left and right. In the concrete leveling device, two light receivers for receiving light from a remote projector set at a certain height are vertically installed in the concrete leveling part with the front and rear positions being shifted from each other. Tilt control mechanism. 2. The concrete leveling apparatus according to claim 1, wherein the concrete leveling portion is mounted on the traveling machine body so as to be rotatable back and forth, and the rotation fulcrum is disposed between the front and rear light receivers in a side view. In addition, a front and rear inclination control mechanism for a concrete leveling device, characterized in that both light receivers are respectively arranged on the left and right sides of the concrete leveling section. 3. The concrete leveling apparatus according to claim 2, further comprising an actuator for rotating the concrete leveling section that is rotatable back and forth based on the light detection of the light receiver. A tilt control mechanism for the concrete leveling device.