JPH0735995Y2 - Concrete floor finishing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a concrete floor finishing machine equipped with a rotary trowel for evenly finishing the surface of concrete that has not solidified yet, and in particular, has a plurality of blades. The present invention relates to a mechanism of a concrete floor finishing machine configured such that a plurality of rotating irons revolve around a central axis of a machine body while rotating to improve workability on a floor surface due to automation.

[Prior Art] Conventionally, as a result of finishing work on the concrete floor surface by the "monolithic construction method",
Improvement of the construction surface of Sakkou and mechanization of trowel work for construction were carried out, and a concrete floor surface finishing machine was realized by incorporating a rotary trowel into the machine together with equipment for control of operation. As a result, mechanical force was introduced into the surface finishing of concrete that did not solidify, and automation of operation came to be done, but robotization of such concrete floor finishing machine is based on experience, and in general, As for its workability, satisfactory development is still needed.

Therefore, as a prior art aiming for workability, one related to the invention and the invention of the applicant of the present invention is disclosed in JP-A-63-261063,
It has already been disclosed as the title of the invention such as "engine-driven concrete floor finishing machine".

[Problems to be Solved by the Invention] Conventionally, in a concrete floor finishing machine, an electric power driven rotary iron is operated on the concrete floor surface by its rotation and revolution around the central axis of the machine body to automatically run. Thus, even the form of a construction machine assembled into one machine was automated. In the successive development stages so far, we encountered some problems, and of course, we recognized that it is necessary to always consider the properties of concrete for the workability of the machine and prepare for the next process. Was done.

First of all, since the electric drive machine needs to be supplied with power while moving, the machine body constantly drags the power supply cable, which not only damages the concrete floor surface during finishing work, There was a fear of being entangled with the rotary iron and being cut by the rotary iron. This point is
It was solved by driving the rotary iron with the output of a gasoline engine, but the power transmission in the structure in which the rotary iron is supported from the engine to the tip of the support member is complicated, and in particular at the center of the fuselage, it is complicated. Manufacturing costs were high and maintenance was inconvenient.

Secondly, regarding the weight of the floor finishing machine, while taking measures to reduce the weight, the balance between the supporting weight of the traveling means of the machine body and the weight of the rotating iron as the iron pressure for finishing the floor surface,
In other words, it was necessary to adjust the sharing ratio of those ground pressures. This adjustment of the share ratio not only relates to the degree of hardening of concrete, but also affects the revolution of the entire machine body.Therefore, the adjustment to correspond to the smoothness of the previous process is subtle and the floor finishing machine Driving required a high level of skill.

Thirdly, with regard to the handling of the floor finishing machine on site, in order to lift the machine body, three automobile jacks were required, and manual operation for each machine was difficult.

[Means for Solving the Problems] The present invention has been developed as a result of earnest research to eliminate these drawbacks in view of the current state of the conventional concrete floor finishing machines. Although the gasoline engine is adopted as the drive source of the rotary iron, the output is converted to hydraulic pressure and each rotary iron is operated by a hydraulic motor, and the working capacity is renewed. It is an object of the present invention to provide an excellent concrete floor finishing machine which is improved to simplify the structure of the central portion of the machine body.

Another object of the present invention is to provide a concrete floor finishing machine in which a second drive system is provided in the center of the machine body in parallel with the drive mechanism. In this drive system, the revolution speed of the rotary iron around the central axis of the entire machine is rationalized, and the ground pressure adjusting device that changes the share ratio between the ground pressure on the concrete surface of the rotary iron and the ground pressure of the traveling means. By providing the above, this machine enables work suitable for the degree of hardening of concrete, and can also serve as the lifting and lowering operation of the machine body.

The basic technical means of the present invention adopts a gasoline engine as a drive source of the rotary iron, and mounts it on a construction machine together with a hydraulic unit driven by this engine, and outputs each output to operate each rotary iron by a hydraulic motor. The concrete floor surface finishing machine of the present invention is provided with a plurality of rotary trowels having a plurality of trowel blades by means of radial support members. In a concrete floor finishing machine that is supported revolvably around the center axis of the machine body, is equipped with a rotary trowel drive unit, a generator, a control unit, etc., and has a traveling means directly below the center axis. The drive is a hydraulic motor driven by a hydraulic unit connected to the gasoline engine, and each hydraulic motor is evenly driven through a series of hydraulic lines. . Further, since the transmission of the driving force is straightforward in the hydraulic piping system, it is possible to add an improvement that simplifies the configuration of the central portion of the machine body.

Next, a concrete floor finishing machine according to a second aspect of the present invention is a concrete floor finishing machine configured to drive a rotary trowel by a series of hydraulic motors. The second drive system is configured by providing the revolution drive device and the ground pressure adjusting device for adjusting the ground pressure between the traveling means and the rotary trowel, and also for performing the lifting operation of the machine body. is there. With this drive system,
A large-diameter horizontal gear fixed to the central shaft meshes with the spline fixed to the vertical shaft of the hydraulic motor that is fixed to the support member and connected to the hydraulic unit, and positively activates the revolution of the aircraft. With such a structure, the lower ends of a plurality of lifting cylinders vertically fixed to the base ends of the supporting members of the rotary irons are abutted via rollers on the upper surface of the gear, and the base ends of the supporting members are The ground pressure adjusting device is configured to be movable up and down with respect to the travel means and adjusts the sharing of the ground pressure between the travel means and the floor surface of the rotating iron.

[Embodiment] A concrete floor finishing machine of the present invention will be described in detail with reference to the drawings of a preferred embodiment. First, a basic structure common to the concrete floor finishing machine of the present invention and the concrete floor finishing machine of the prior art will be described with reference to FIGS. 1 to 3 and FIGS. 7 to 9.

In these figures, concrete floor finishing machine PT
Is called "Power Trowel", and three rotary irons 20 are rotatably supported on a machine body 10 having traveling means,
It is equipped with operation and control equipment. The main part of the machine body 10 is a central axis 11 located at the center of the machine body, which runs on the concrete floor surface F and rotates the rotary iron 20 and the center axis 11 of the machine body 10.
The uncured concrete is leveled by the revolution around the. The airframe 10 further includes four radial frame members 12 that meet at the central axis 11 and circular frame members 13 and 13 inside and outside the concentric circles.
Assembled in a basket shape by a soundproof and dustproof protective cover 12
The frame member 12 supports the outer circular frame member 13 near the floor surface F by extending a.

As shown in FIG. 3, a deck 14 is rotatably supported on the central shaft 11 via a sleeve 15 on the upper surface of the fixed seat 15a at an intermediate height. Immediately below the fixed seat 15a, a frame 16 is detachably connected by a pin 16a, and as a traveling means 17, a pair of left and right traveling rollers 17a are individually rotatably supported, and the traveling rollers 17a are respectively It has a built-in drive motor 18. Due to the above, the fuselage 10
11 and the traveling means 17 are integrated with each other. Reference numeral 19 is a direction indicating lamp installed on the upper surface of the machine frame 10 in parallel along the frame member 12.

On the deck 14 which is rotatable with respect to the fixed body 10 described above, the rotary iron 20, the driving machine 30, the generator 40 and the control device 50 are mounted.

First, the rotary trowel 20 has three trowel blades 21 arranged radially, and the deck 14 whose base end is rotatably supported by the central axis 11 at an angle of 120 degrees is constituted by three supporting members. This is used as a support arm 22, which is arranged at its tip with its axis of rotation vertical and forms a horizontal mechanical iron. Support arm
The middle part of 22 is divided into a base end side 23 and a tip end side 24,
An angle adjusting device 60 for the support arm 22 is formed in this portion. The angle adjusting device 60 is provided on the proximal side 23 by the horizontal shaft 61.
And the tip end side 24 are pivotally attached in a vertically swingable manner. In one example, a turnbuckle 62 is installed between both parts, and the angle of the support arm 22 with respect to the floor surface F is expanded and contracted by operating the lever 63. By changing the horizontal angle of the rotating surface where the rotating iron 20 contacts the concrete surface, the central axis is changed.
It is for controlling the revolution speed of the rotary iron 20 around 11. The angle adjusting device 60 can also be provided in the middle of the vertical portion 22a at the tip of the support arm 22. Reference numeral 25 in the drawing denotes a trowel angle adjusting device for adjusting the angle (attack angle) of each trowel blade 21 of the rotary trowel 20 from the horizontal posture.

The control device 50 is equipped for operation of the concrete floor finishing machine PT, is supplied with power from the generator 40, has a control panel 51, and has a receiver 5
2, including the antenna 53, transmitter 54, etc., the lower circular frame material 1
A touch sensor 55 for detecting a traveling obstacle provided along the outer periphery of 3 is also connected to the control device 50 and controlled by the CPU. Further, the operation of the control panel 51 can control not only the traveling of the airframe 10 but also the gasoline engine 30.

Further, in the embodiment of the rotary iron of the concrete floor finishing machine PT, the configuration of the trowel blades of the rotary trowel has a rocking restricting device, and this rocking restricting device is horizontal from the vertical axis of the rotary iron. The tip of the second supporting member in the radial direction to be supported is supported by including brackets axially attached to the upper and lower sides, and by controlling the relative movement between the brackets, the trowel blade is made of concrete. An elastic material is interposed to prevent the surface from swinging.

In the preceding example, a gasoline-powered engine 30 is adopted as the driving machine 30 on the deck 14. The engine 30 guides its output to the input side universal shaft 32 of the gear box 31, and the bevel gear mechanism distributes the driving force in the direction of each rotary iron 20 through the output side power shaft 33. Then, the force is distributed in the direction of each rotary iron 20 through the worm gear 34, and the vertical shaft 35 of the rotary iron 20 is rotated through the worm gear 34 provided at the tip thereof. This makes the rotary trowel
20 receives the engine drive output and finishes the floor F.

Thus, the entire concrete floor finishing machine PT is stably supported on the floor surface F by the traveling roller 17a and the trowel blades 21 of the rotary iron 20 and the traveling means 17 travels while rotating the rotary iron 20. , And during that time, the concrete floor surface is leveled and finished by the rotation of the rotary iron 20 and the revolution around the central axis 11.

1 and 2 are a plan view and an elevation view showing the outline of a preferred embodiment of the concrete floor finishing machine of the present invention.

In the present invention, the gasoline-powered engine 30 is adopted as the drive unit 30 on the deck 14 as in the conventional case,
The engine 30 of the present invention guides its output to a hydraulic unit 70 which is freely arranged adjacently on the deck 14, and drives the rotary iron 20 by hydraulic pressure. FIG. 3 is a detailed explanatory view of the central portion of the machine body, and FIGS. 4 to 6 are hydraulic circuit diagrams.

This hydraulic unit 70, as shown in FIG. 4 and FIG.
The hydraulic pump P driven by the engine 30 and the relief valve 70
a, an on-road valve 70b, and a plurality of switching valves 70c according to the circuit, the output side of which is a hydraulic motor 72 (M1, M2, M3) arranged on each rotary iron 20 through a hydraulic pipe 71. To form a hydraulic circuit that returns to the pressure oil tank 73 of the hydraulic unit 70 after rotating each hydraulic motor 72, during which the rotary iron 20 is rotated by the drive output of the hydraulic unit 70. , Finish the floor F. Hydraulic piping 71
For this, a synthetic resin or a tube such as a hose that is lightweight and flexible and can be easily bent and connected can be used. The dashed line is the return pipe.

In this configuration, in the related art, the power shaft 33, which is arranged parallel to the inside of the support arm 22 from the transmission shaft of the engine 30 through the gear box 31, includes the angle adjusting device 60, and has a complicated angle transmission structure. It is characterized in that only the hydraulic pipe is improved, and the complicated structure around the central axis 11 is simplified, and the main part of the present invention which renews the driving force transmission system is constituted.

The total equipment weight of the floor finishing machine PT is supported by being shared by the ground pressure on the concrete surface of the rotary iron 20 and the ground pressure of the traveling roller 17a. In relation to the degree, with respect to the traveling means 17 supporting the entire body 10, the height of the support arm 22 can be changed, and adjustment can be made by changing the ground pressure at which the rotating iron 20 contacts the concrete surface. Therefore, the revolution speed of the rotary iron 20 about the central axis 11 can be controlled.
Further, the revolution of the floor surface finishing machine PT around the central axis 11 is also related to the reaction force from the floor surface when each rotary iron 20 rotates. In the floor finishing machine of the prior art, the revolution speed of the machine body 10 was extremely delicately adjusted depending on the hardening condition of concrete, and it required a high degree of skill to operate.

Therefore, in the second aspect of the present invention, the second drive system is configured, and the output of the hydraulic unit 70 is further utilized for these adjustments. As shown in the hydraulic circuit diagram of FIG. 6, by adding a part of the output side of the hydraulic unit 70,
A revolution drive device 80 for controlling the revolution of the whole 10 is formed, a hydraulic motor 82 (M4) is driven via a hydraulic pipe 81, and a ground pressure adjusting device 90 is formed in another part, and a hydraulic pressure pipe 91 is provided. A plurality of lifting cylinders 92 are configured to extend and retract.

As shown in FIGS. 1 to 3, the base end portion of the support arm 22 is fixed to the outer surface of the sleeve 15 loosely fitted to the central shaft 11, and in the revolution drive device 80 of the second drive system, sleeve
Below the 15, a gear 26 having a relatively large diameter is horizontally fixed. A hydraulic motor 82 is fixed near the central shaft 11 at the base end of the one support arm 22, and the rotation axis of the hydraulic motor 82 is vertical, and the spline 27 is attached, and the spline 27 is meshed with the gear 26. The rotation of the motor 82 rotates the support arm 22 around the central axis 11 and causes the rotary iron 20 to revolve.

A ground pressure adjusting device 90 is further formed on the second drive system between the base end of the support arm 22 and the central shaft 11. The ground pressure adjusting device 90 includes the horizontal gear 26 and hydraulically operated lifting cylinders 92, 92 fixed to the base end of the support arm 22 so as to extend and contract in the vertical direction. At the lower end of 92, a roller 93 that is in contact with the upper surface of the gear 26 and rotates in its rotation direction is rotatably supported, and the reaction force of expansion and contraction is lifted up and down the support arm 22 by the upper surface of the gear 26 without friction. Therefore, the ground pressure of the rotary iron 20 at its tip is adjusted.

The drive by the hydraulic unit, which is the basis of the present invention, is not limited to the above embodiment, and for example,
The drive of each rotary iron by the hydraulic motor can be performed by a single structure, a combination with the second drive system, or a structure by the second drive system. Further, the second drive system can also be equipped with the revolution drive device 80 and the ground pressure adjusting device 90 independently in the concrete floor finishing machine.

Further, if three lifting cylinders 92 are used for each support arm 22, the support arms 22 can be made more stable.

[Operation] The operation of the concrete floor finishing machine PT of the present invention will be described based on its use and operation method. When working on the concrete floor finishing machine PT, first of all, in the present invention, the rotary trowel
The adoption of the gasoline engine 30 as the basic drive of 20 is not just a choice of power, it can eliminate all the temporary costs for power distribution in the workplace, and it also has to route the power supply cable. No damage to the concrete surface. Further, by adopting a hydraulic unit 70 driven by one engine, and by transmitting the output thereof in series to a hydraulic motor 72 for the rotary iron 20 via a pipe 71 to drive the hydraulic motor 72, the conventional rotary motor Similar to the electric motors distributed separately for each trowel 20, each requires a hydraulic motor 72, but their equipment weight is obviously reduced. Further, the power transmitted from the engine 30 alone to each rotary iron 20 through the gear box 31 is only one system of the hydraulic pipe 71, and the rotary iron 20 is uniformly given a hydraulic operating force.
The rotation speed of each rotary iron 20 is uniform, and the individual hydraulic motors 72 do not generate noise.

When operating the concrete floor finishing machine PT of the present invention, first the generator 40 is manually started, and the control device 50 is started from the receiver 52 according to a command from the transmitter 54,
When 30 is started, its output drives the hydraulic pump P of the hydraulic unit 70, and the controller 50 causes the on-load valve 70b to operate.
Adjustment, select the switching valve 70c, and through the pipe 71
0 transmitted to hydraulic motor 72. The rotary irons 20 rotate at the same speed by means of hydraulic pipes in series, and finish the concrete floor surface F as the concrete floor finishing machine PT travels. The rotary iron 20 rotates about a vertical axis and acts to revolve the support arm 22 around the central axis 11 by a reaction force against the floor surface F. At this time, the delicate manual control of the revolution is performed. , In the present invention,
By the revolution drive device 80 of the second drive system, this revolution can be performed by actively controlling the revolution.

On the other hand, during this operation, the traveling roller 17a is independently controlled to advance straight or in a desired direction, and the direction is displayed on the direction indicator lamp 19. When the concrete floor finishing machine PT comes into contact with any obstacle during traveling, the touch sensor 55 is actuated, and the traveling is controlled to reverse and stop. During this time, the direction indicator lamp 19 flashes and the machine frame 10
The entire direction is changed or obstacles are removed. The protective sheet 12a prevents noise from diffusing, and also prevents contamination due to the scattering of "Noro" of the mortar from the floor surface F and damage to the machine section. Moreover, by disposing the hydraulically driven motor 72, the universal shafts 32 and 33, which require a complicated angle configuration, are simplified, the overall configuration of the airframe 10 becomes very clear, and the manufacturing cost is reduced.

Another feature of the concrete floor finishing machine PT of the present invention is the ground pressure adjusting device 90 of the second drive system. This device smoothly extends the support shaft 22 through expansion and contraction of a lifting cylinder 92 that expands and contracts by a reaction force on the upper surface of the gear 26 fixed to the central shaft 11, and rolling of a roller 93 that is pivotally supported at the tip thereof. Raise and lower. Therefore, the share of the equipment weight of the fuselage 10 on the central shaft 11 is adjusted between the ground pressure of the traveling roller 17a and the ground pressure of the rotary iron 20 on the concrete surface. Since the hydraulic output of is used, the intermediate presser and finish leveling can be performed early when the cast concrete is not yet sufficiently hardened, and the workability is improved. On the other hand, the mesh between the gear 26 of the revolution drive device 80 and the spline 27 is free to move in the longitudinal direction of the revolution drive device 80. Therefore, the revolution of the entire machine body 10 is not affected, and the second drive system causes revolution and ground pressure. Effective for both adjustments.

Further, the ground pressure adjusting device 90 includes the traveling means 17 or the rotary trowel.
Since only 20 can be lifted and lowered, it is possible to serve also as a lifting function for maintenance of the rotary trowel 20 and the traveling motor 18 without using another jack.

The above-mentioned manual angle adjusting device 60 is used in combination with the ground pressure adjusting device 90 which also has a hydraulic operation of the motor 82 of the revolution drive device 80 in the second drive system of the second aspect of the present invention and a lifting function thereof. It can be used alone.

The trowel angle adjusting device 25 also contributes to a leveling finish corresponding to the degree of hardening of concrete. This device allows the trowel 21
Suitable for soft concrete by reducing the angle of
Efficiency can be improved without causing a scraping action, and since the angle of attack is made deeper for slightly hardened concrete and sufficient pressure is applied, the finishing accuracy is improved.

[Effects of the Invention] In the concrete floor finishing machine of the present invention, first, a gasoline engine is adopted as a driving machine of the rotary trowel in the machine frame of the freely movable floor finishing machine equipped with a plurality of rotary trowels. Therefore, not only are all the difficulties experienced with the electric floor finishing machine eliminated, but the hydraulic motors provided for each rotary iron are concentrated only on the hydraulic units that are freely arranged on the machine frame. It can be operated by piping in series, and not only the operation of each hydraulic motor can be made uniform, but also the overall weight and cost can be reduced. In addition, the output of the hydraulic unit constitutes the second drive system, the revolution of the entire machine body is positively controlled, and the ground pressure adjusting device is operated. Therefore, the workability and workability of the floor finishing machine can be improved. It can be used for maintenance because it can be moved up and down while adapting to the properties of concrete. Furthermore, as a concrete floor finishing machine, it adds a construction function similar to manual work, and it follows the changes in the unevenness of the poured concrete and makes a leveling finish at a rotation speed according to the degree of hardening. Therefore, it should be noted that the workability and accuracy of the floor finishing machine are remarkably improved, and the present invention greatly contributes to the construction industry in the field of the concrete floor finishing machine.

[Brief description of drawings]

1 is a plan view of a concrete floor finishing machine according to the present invention, and FIG. 2 is a plan view of the concrete floor finishing machine according to the present invention. -A vertical cross-sectional view taken along line -2, Fig. 3 is a detailed explanatory view of the center of the machine body,
4 and 5 show the piping system of the operation drive system of the rotary iron,
The top view of the principal part of FIG. 1 which shows the revolution drive device of the whole concrete floor finishing machine and the piping system of the 2nd drive system containing a ground pressure adjusting device, FIG. 6 shows the whole hydraulic system circuit. FIG. 7 is a block diagram, FIG. 7 is a schematic plan view illustrating the basic configuration of a conventional concrete floor finishing machine, and FIG. 8 is a vertical sectional view taken along line 8-8 of FIG. FIG. 9 is a vertical cross-sectional view of the main part including the traveling means. 10 ... Airframe, 11 ... Central axis, 14 ... Deck, 17 ... Traveling means, 20
... Rotating iron, 21 ... Iron blades, 22 ... Support shaft, 26 ... Gear, 27 ... Spline, 30 ... Engine, 40 ... Generator, 50 ... Control device,
60 ... Angle adjusting device, 70 ... Hydraulic unit, 71, 81, 91 ... Hydraulic piping, 72 ... Hydraulic motor, 80 ... Revolution drive device, 82 ... Hydraulic motor, 90 ... Ground pressure adjusting device, 92 ... Lifting cylinder, 93 ... Roller, F ... Concrete floor surface, P ... Hydraulic pump, PT ... Concrete floor surface finishing machine.

Claims (7)

[Scope of utility model registration request] 1. A rotary trowel drive unit, a generator, and a control unit for supporting a plurality of rotary trowels having a plurality of trowel blades so as to be revolvable around a central axis of the body by a radial support member. In a concrete floor finishing machine equipped with a device etc. and having traveling means just below the central axis, the drive machine of the rotary trowel is a hydraulic motor driven by a hydraulic unit connected to a gasoline engine. A concrete floor finishing machine characterized in that the motor is driven uniformly through hydraulic lines in series. 2. A horizontal gear fixed to a central shaft meshes with a spline fixed to a vertical axis of another hydraulic motor fixed to a supporting member and connected to a hydraulic unit, thereby positively revolving the body. The concrete floor finishing machine according to claim 1, characterized in that it forms a revolution drive device that is actuated mechanically. 3. A large-diameter horizontal gear is fixed to the central shaft,
On the upper surface of this gear, vertically fixed to the base end of the support member of each rotary trowel, the lower end of the cylinder connected to the hydraulic unit is abutted via the roller attached thereto, the base end of each support member, 3. The ground pressure adjusting device, which is configured to be movable up and down with respect to the traveling means of the machine body, for adjusting the sharing of the ground pressure with respect to the floor surface of the traveling means and the rotary trowel. Described concrete floor finishing machine. 4. A horizontal large-diameter gear fixed to the central shaft,
It is fixed to the support member and meshes with a spline fixed to the vertical axis of another hydraulic motor connected to the hydraulic unit, forming a revolution drive device that positively activates the revolution of the machine body and the upper surface of the gear. The lower ends of a plurality of lifting cylinders fixed vertically to the base ends of the supporting members of the rotary irons are abutted via rollers, and the base ends of the supporting members are configured to be movable up and down with respect to the traveling means. 2. The concrete floor finishing machine according to claim 1, further comprising a ground pressure adjusting device for adjusting the sharing of the ground pressure between the traveling means and the floor surface of the rotary trowel. 5. A plurality of rotary irons having a plurality of iron blades are rotatably supported by a radial support member on the machine body so as to be able to revolve around a central axis of the machine body, and a drive machine, a generator and a control of the rotary machine are provided. In a concrete floor finishing machine equipped with a device etc., equipped with traveling means directly below the central shaft, and having a hydraulic unit connected to a gasoline engine, a horizontal gear fixed to the central shaft is used as a supporting member. Concrete floor characterized in that it meshes with a spline fixed to the vertical axis of another hydraulic motor that is fixed and connected to the hydraulic unit, forming a revolution drive device that positively activates the revolution of the aircraft. Surface finishing machine. 6. A rotary trowel drive unit, a generator, and a control unit for supporting a plurality of rotary trowels having a plurality of trowel blades on the airframe so as to revolve around a central axis of the airframe. In a concrete floor finishing machine equipped with a device etc., equipped with traveling means just below the central shaft, and having a hydraulic unit connected to a gasoline engine, a large-diameter horizontal gear is fixed to the central shaft, On the upper surface of this gear, the lower end of the lifting cylinder fixed vertically to the base end of the support member of each rotary trowel and connected to the hydraulic unit is abutted via a roller, and the base end of each support member is connected to the traveling means. A concrete floor finishing machine, which is configured to be movable up and down with respect to the traveling means and forms a ground pressure adjusting device for adjusting the sharing of the ground pressure with respect to the floor surface of the rotating iron. 7. A rotary trowel having a plurality of trowel blades supported by a radial support member on the machine body so as to be capable of revolving around a central axis of the machine body, and a rotary trowel drive unit, a generator, and a control unit. In a concrete floor finishing machine equipped with a device etc., equipped with traveling means just below the central axis, and having a hydraulic unit connected to a gasoline engine, a horizontal large-diameter gear fixed to the central axis is It is fixed to the support member and meshes with a spline fixed to the vertical axis of another hydraulic motor connected to the hydraulic unit, forming a revolution drive device that positively activates the revolution of the machine body and the upper surface of the gear. Is fixed vertically to the base end of the support member of each rotary iron,
The lower end of the lifting cylinder connected to the hydraulic unit is brought into contact with the roller via rollers, and the base ends of the supporting members are configured to be movable up and down with respect to the traveling means. A concrete floor finishing machine that is characterized by forming a ground pressure adjusting device that adjusts the share.