JP2019190266A - Constant thickness cutting device and constant thickness cutting method - Google Patents

Abstract

To solve the problem in which the cutting depth of a constant thickness cutting device could not be changed arbitrarily on site, and a depth adjustment shim was removed each time the cutting depth was changed, and cutting the road surface on the bridge made it in the shape of V after cutting, causing a step in the waterproof sheet adhered in parallel to the bridge length; also, if there is no shim for adjusting the depth of the constant thickness cutting device, a liner portion will be worn; furthermore, an idle pin may be damaged by impact and vibration.SOLUTION: The cutting depth can be changed simply by tilting a body frame. A method of turning by a depth adjustable type adjustment shim and an electric motor and a method of cutting by running a hydraulic excavator are combined with each other, so that the road surface on a bridge can be cut in the bridge length direction. The depth adjustment shim can be attached and detached even if the bolt on the liner portion cannot be inserted or removed. A bearing retainer is attached to a bearing of the idle pin to make it a both end support idle pin, resulting in increase in endurance performance.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a concrete constant-thickness shaving apparatus and a constant-thickness shaving method that are attached to the tip of an arm of a hydraulic excavator and grind a concrete road surface or a concrete wall surface with a constant thickness.

In general, when the surface layer of a concrete surface in a concrete structure deteriorates, it is necessary to repair it after removing the deteriorated surface layer until a healthy surface appears. This was done manually using a hand breaker or the like.
However, manually shaving the entire concrete surface of a concrete structure over a long period of time in a poor working environment where a large amount of shaving dust is generated is extremely severe, and the burden on the worker is physically and mentally There was also a problem that it was big.

Manual work can easily make a big difference in the technical skills of the workers, and when the concrete surface is lifted by hand with an impact tool such as a hand breaker, a large number of microcracks have been generated and the sound concrete has been weakened.
In addition, the efficiency of manual work by workers is poor, and there is a risk of vibration disturbances set by the Minister of Health, Labor and Welfare, such as white wax disease, which is known to be easily caused by persons with occupations that use tools with strong vibration such as hand breakers. is there.
As a result, a great deal of labor and time are required, leading to problems such as a prolonged construction period and an increase in construction costs.

  Also, in order to reduce the amount of shavings in order to prevent soaring costs of industrial waste such as concrete shavings, the cost of industrial waste and the construction promoted by the Ministry of Land, Infrastructure, Transport and Tourism are reduced by cutting the structure to a constant pressure. There is a need to reduce the amount of materials such as concrete and asphalt to be buried by accelerating budget packaging, but there was an objective to reduce the cost.

In view of such a situation, the applicant has made the following proposal.
As shown in FIG. 1, a main body frame (1) and a main body frame (1) mounted on a hydraulic excavator arm (50) in a swingable manner by expansion and contraction of a hydraulic excavator cylinder (52) via a bracket (10). ) Is a concrete constant-thickness shaving device that performs concrete shaving work by pressing a shaving drum (20) attached to the concrete surface (90).

JP 2002-266313 A

Conventional asphalt / concrete shaving devices are devices that grind only a certain depth. It was necessary to adjust the depth according to the object (strength) to be shaved and to adjust the depth according to the application (wall surface (vertical) / road surface (downward)) and the shaving depth to be constant.
In addition, since the concrete constant-thickness cutting device can cut constant thickness to a constant depth by the depth adjustment shim (30), it is possible to cut at a constant thickness when roughing, but the depth adjustment shim (30) is sufficient when finishing. In addition, the fine unevenness could not be made constant and finished unless it was replaced with a thin part.

A turning portion (2) is provided between the bracket (10) and the main body frame (1) so that the cutting direction can be freely changed. However, each time the turning portion (2) is hydraulically operated, a shaving drum is provided. The hydraulic pressure for rotating (20) temporarily decreased, the cutting force decreased, and in the worst case, the rotation of the cutting drum (20) stopped and the combined operation of cutting while turning could not be performed.
As the cause, the exhaust gas regulation and the small turning of the hydraulic excavator as a driving source are advanced, and it is difficult to supply the stable hydraulic oil simultaneously with the arm operation from the hydraulic excavator. Also, the oil pressure and the amount of oil are emphasized on the operation of the arm (50) of the excavator, and if the arm (50) operation is performed, another phenomenon that the oil pressure does not occur occurs and sufficient cutting force cannot be obtained. One of the major causes.

  As shown in FIG. 6, the arm (50) of the excavator (51) operates in the direction of the arm operation direction (b). Therefore, if the shaving direction of the shaving drum (20) is shaved in the same direction as that of the arrow (b), the shaving efficiency is good, but the uncut portion (91) remains in a large area in a small-sized bridge with a narrow width. For this reason, finishing work must be done separately using a vibration tool such as a hand breaker for a long time.

Further, a depth adjusting shim of a conventional shaving machine is a component for controlling the shaving depth. Depending on the strength of the object to be cut, the liner (7) and the depth adjustment shim (30) may be deformed when exposed to vibrations several tens of thousands of times. Further, the main body frame (1) may be deformed.
Therefore, even if the excavator presses the shaving machine against the object to be cut (90) with a strong pressing force, it is easy to replace the machine depending on the application, and it will not be deformed even if it is used for many years, and the main body prevents wear of the liner part (7). A frame (1) and depth adjustment shim (301) structure was desired.
In addition, there has been no concrete cutting machine in the construction of bridges, etc., and an asphalt cutting machine that is not used for the purpose has been used, and the bridge may bounce at the time of cutting, and if it resonates with the cutting vibration generated by the asphalt cutting machine, In some cases, there was resonance that prevented people from standing, making it impossible to cut.
In addition, when the bridge vibrates, it becomes mottled on the shaving surface and becomes a standing shape. Then, in the waterproofing construction and asphalt laying construction in the next process, the adhesiveness deteriorated and a problem sometimes occurred. Therefore, it is desired to cut to a smooth finish with a certain thickness.

  The large asphalt cutting machine has a down cut structure to discharge the cut material at the same time. In other words, the cutting work was done by rotating from top to bottom with respect to the cutting direction, but the asphalt cutting machine jumped up each time the bit of the cutting drum contacted a hard road surface such as concrete. Similarly, the vibration of the asphalt cutting machine equipped with the conventional hydraulic excavator could not be suppressed even if it was pressed by the hydraulic excavator. In addition, when a large hydraulic excavator is attached and the pressing force is increased, the rotation of the shaving drum may stop in the case of a hard cut object. This is because the concrete coarse aggregate is hard, and those using natural stone as the coarse aggregate have a compressive strength of 60 N / mm 2 or more, and further increase the vibration.

A shaving machine that works on inferior worksites where the concrete is cut to a constant thickness soaks up the concrete shavings, enters the gap of the gear cover (31), and attaches to the gear part, causing significant gear wear and causing the grease to break. It was the cause of failure of the shaving machine.
When a grease-enclosed bearing was used so that the cover was covered to cover the gear portion and grease was not required, the powder adhering around the bearing was hardened and damaged by moisture generated by condensation. In addition, when the work was prolonged, the enclosed grease was dried, but the bearings could not be periodically replaced, resulting in seizure. Moreover, regular exchange was complicated.

  Conventionally, the concrete shaving machine has to transmit the driving force of the hydraulic motor (5) from the motor gear (501) to the drum gear (503) attached to the cutting drum (20) through the idle gear (502). It was necessary to cover the triple gear (501.52.503) with a gear cover (34) so that dust does not enter and foreign matter is not pinched. However, if it does so, it will become impossible to supply grease to the idle bearing (46) of the bearing part which mounts the idle gear (502) to the idle pin (32). As a result, the bearing to be used for the bearing portion has to be selected only with grease sealed.

In the grease-enclosed bearing, grease is enclosed in the rotating part, and it is not necessary to supply the grease, but it must be periodically replaced. In fact, the grease sealed with a seal dries little by little, and even if it was not used, if the time passed and the life reached, there was a risk that the grease would dry out and cause seizure.
In addition, grease-enclosed bearings are often used in large quantities and have low load resistance. It was not suitable for construction machinery with a lot of vibration and impact and high load capacity.
Therefore, a grease nipple (33) is provided at the center of the idle pin (32) so that grease can be applied in order to use a taper bearing or roller bearing with a large load resistance. However, most of the grease supplied is idle. Since it passes through the inside of the bearing (46) and is discharged as it is, a configuration in which grease is stored inside the idle bearing (46) as much as possible is necessary.
Also, a groove (319) was dug in the idle pin (32) to prevent the idle bearing (46) from falling off with the C-type retaining ring (36). As a result, the idle bearing (46) vibrates and seizes, resulting in a major repair.

Further, when the idle bearing (46) is fixed with a commercially available product such as a C-type retaining ring (39) or a bearing nut, the grease supplied does not stay inside the idle bearing (46) but from both sides of the idle bearing (46). It was also easy to flow out.
Therefore, when a grease-enclosed bearing is used, if the grease dries after 1 to 2 years, it causes seizure. Even if the user was told to replace the bearings regularly, the user could forget to replace the bearings and notice that the grease had dried out, which could cause seizure.
In addition, the grease-enclosed bearing is configured such that grease is enclosed with lids on both sides of the bearing, but additional grease cannot be supplied. Therefore, it was decided to change to a type that regularly greases grease.

Also, grease-enclosed bearings need to be replaced regularly even if they have not been used for a long period of time, but since users have rarely used them, the bearings should be worn out and replaced. There were times when it was postponed.
As a result, the life of the bearing that is greased up every day is extended. Even if it is lent by leasing, if the site where the malfunction occurred is immediately known, it is used while crossing the site, and the users are different, it is better to make it easier to identify the malfunction due to failure to grease up. The location is easy to understand.
The idle bearing (46) is an error at the time of assembly or an error at the time of machining, and even if it is designed so that there is no gap, the C-type retaining ring is worn and rattling occurs. Therefore, there is a method of pressing the bearing using the bearing nut (60), but the nut may be loosened by impact and vibration during use. There is also a method of fixing the bearing nut (60) with a star washer (61) to prevent loosening, but it is necessary to additionally process key groove processing and screw processing on the idle pin (32), resulting in high processing costs. It is possible. With additional machining, the load capacity of the idle pin (32) was reduced.
Further, in the method of pressing the bearing (32) using the bearing nut (60), most of the grease does not stay in the bearing (46) but is discharged.

In the method of stopping the idle bearing (46) with the C-type retaining ring (39), a gap (o) of about 1 cm is generated, and the grease supplied from the idle pin (32) is discharged as it is and used for lubricating the bearing portion. It will not be done. Similarly, even if it is stopped by a commercially available bearing nut (60), a gap (ω) of about 5 mm is generated and the sheet is discharged as it is. The grease should be made as narrow as possible so that the grease is kept inside, but an economical interval should be selected in consideration of errors in machining, errors in assembly, and the like.
As one of the problems to be solved in the conventional method, it has been desired to keep pressing the bearing (46) at a constant pressure and prevent the grease from being discharged.
The idle pin (32) is fixed to the main body frame (1) by welding (322) at the base end. A heavy idle gear (502) is attached to the idle pin (32). When the main body (1) receives a large load due to vibration or impact during cutting, the idle pin (32) may break from the welded portion (322). The idle pin (32) is a cantilever shaft held by the welded portion, and if possible, if it is in a both-end supported state, it has a sturdy structure that is resistant to vibration and impact and can prevent the welded portion (322) from being broken.

If the bearing retainer is molded so as to fit in accordance with the shape, it can be set to a gap (p) of 2 mm or less. In addition, when used in cold areas, if there is a large gap, moisture condensed in the gear case may enter the bearing, rusting the bearing, or emulsifying grease, which may impair lubricity. .
When the C-type retaining ring (39) is removed, the bearing (46) moves to the tip of the idle pin (32), the idle gear (502) is tilted, and the idle bearing (46) is burned out or popped out. become. Even after the bearing (46) is removed, the idle gear (502) continues to transmit the driving force of the hydraulic motor (5) through the gap (μ) while contacting the cover (34), and the idle pin (32) is seized. There was a case where the work continued without being noticed until it fixed to the idle gear (502) or the idle pin (32) was lost, resulting in a major repair. If the idle bearing (46) is noticed and replaced when it is removed, a large repair can be avoided.

When the bearing retainer (40) is inserted with the same width as the gap between the gear cover (34) and the idle bearing (46), the idle bearing (46) is pressed even if the gear cover (34) is attached to the main body (1) with a bolt. Does not occur. Because the idle bearing (46) rattles immediately due to processing errors and assembly errors, and the life of the idle bearing (46) is shortened, the bearing (46) is always pressed with a constant pressure by the bearing retainer (40). Is desirable.
It is desirable that the bearing presser (40) is pressed so as to press the idle bearing (46) when the cover (34) is assembled.
Further, when the surface of the cover (34) is extended and the force for pressing the bearing retainer (40) is lost, it is desirable to restore the pressing force as it was. It is desirable that the bearing retainer (40) presses the idle bearing (46) and holds the idle pin (32) at the tip for a long period of time.

Therefore, a shaving machine that attaches a main body frame to a hydraulic excavator arm so as to be swingable via a bracket, presses a shaving drum attached to the main body frame against a concrete surface, and performs a shaving work of concrete,
Providing a concrete constant-thickness shaving device that features a depth adjustment shim that changes the shaving depth according to the tilt of the main body frame, and changes the shaving depth parallel to the drum and at an angle. To do.

Further, a shaving machine that attaches a main body frame to a hydraulic excavator arm via a bracket so as to be able to swing, presses a shaving drum attached to the main body frame against a concrete surface, and performs a concrete shaving work,
Provided is a concrete constant-thickness shaving apparatus comprising a turning portion that is turned by an electric motor between the bracket and the main body.
Further, a shaving machine that attaches a main body frame to a hydraulic excavator arm via a bracket so as to be able to swing, presses a shaving drum attached to the main body frame against a concrete surface, and performs a concrete shaving work,

  In order to prepare a depth adjustment shim that changes the cutting depth according to the inclination of the main body frame in parallel with the cutting drum and to make an angle, a swivel portion that turns with an electric motor is provided between the bracket and the main body. We propose a road surface shaving method characterized by running a hydraulic excavator and shaving a concrete road surface using a concrete constant thickness shaving device.

  Therefore, a main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against the object to be shaved, and the shaving drum is prevented from entering the shaving object deeper than set. A depth adjusting shim and the depth adjusting shim provide a constant-thickness shaving device that covers up to just below the main body frame.

A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against the object to be shaved, and a depth to prevent the shaving drum from entering the object to be shaved deeper than set. A constant-thickness cutting apparatus in which an adjustment shim and the depth adjustment shim are fixed with bolts, and a liner portion fixed to the main body frame and a bolt hole of the liner portion are elongated holes in the cutting direction.

Further, a main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against an object to be shaved, a motor for driving the shaving drum, and a motor gear attached to the motor An idle gear for transmitting a driving force to a grinding drum gear attached to the grinding drum;
An idle pin that pivotally attaches to the idle gear, a grease supply hole that supplies grease supplied via the idle pin to the bearing portion of the idle gear, and stores excess grease supplied from the grease hole There is provided a constant thickness cutting device provided with a gear cover covering a motor gear, the cutting drum gear and the idle gear.

  A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum for pressing against a shaving object attached to the main body frame, and a depth for suppressing the shaving drum from entering a shaving object deeper than set. The height adjustment shim and the cutting drum are rotated upward from the bottom to the cutting direction, and the depth adjustment shim is pressed against the object to be cut and moved so that the cutting direction of the drum is an upper cut. We propose a shaving method.

  A main body frame attached to the tip of an arm of a hydraulic excavator, a drum attached to the main body frame and pressed against an object to be cut, a hydraulic motor for driving the drum, and a motor gear attached to the hydraulic motor; A drum gear attached to the drum, an idle gear for transmitting the driving force of the motor gear to the drum gear, an idle pin for mounting the idle gear, a gear cover for covering the motor gear, the idle gear, and the drum gear, A shaving apparatus comprising: a bearing attached to an idle pin to support rotation of the idle gear; and a bearing press attached to the gear cover and pressed against the bearing attached to the idle pin. To do.

Further, the grinding device characterized in that the gap between the bearing retainer (40) and the idler gear (502) rotating part is 2 mm or less, and the length of the gap is 2 mm or more.
Further, there is provided a shaving device comprising a C-type retaining ring attached to the idle pin so that the bearing does not fall out, and a bare link presser covering the C-type retaining ring so as not to spread.
There is provided a shaving apparatus comprising a bearing retainer made thicker than a gap between the gear cover and the idle bearing.
A shaving apparatus is provided, wherein a pressing thickness adjusting shim is inserted between the gear cover and the bearing retainer.

In the present invention, the shaving depth adjusting shim (30) attached to the main body frame (1) is cut, and a figure-shaped shaving depth adjusting shim (301) is attached so as to form an angle larger than the drum radius (201). As shown in FIG. 5, the maximum cutting depth (α) became shallow as the main body frame (1) tilted, and the cutting depth changed.
As a result, the unevenness of the cut surface can be finished flat without having to replace the depth adjustment shim (30) each time. Roughing and finishing operations can be performed with one type of cutting depth-changing type adjustment shim (301), and the work is not interrupted by exchanging the depth adjustment shim (30). Easily reduce the cutting depth by swinging and tilting the main body frame (1) with the expansion and contraction of the cylinder (52) by attaching the cutting depth change type adjustment shim (301) with an angle according to the cutting drum (20) You can adjust the height.

  Moreover, the swivel part (2) arranged between the bracket (10) and the main body frame (1) is changed from the conventional hydraulic swivel to the electric motor (40), so that the excavator (51) can be swung. It can now be installed without piping (not shown). The swivel unit (2) only needs to be provided with a hydraulic port (45) for supplying hydraulic pressure to the hydraulic motor (5) for driving the shaving drum (20), and the maintenance is simplified.

The electric wiring eliminates the need for modification of the hydraulic excavator, and the constant thickness shaving device (8) with the swivel part can be attached later.
In addition, when the swing motor is hydraulic, the hydraulic oil leaks due to vibration during the shaving operation and the swing motor rotates, and the orientation of the main body frame (1) may change. As a result, the shaving direction changes, and the scattering direction of the shavings may change, affecting the surroundings.
By using the electric motor (40) of the present invention, the swivel part (2) can be attached with a simple wiring. Moreover, the malfunction which the main body frame (1) turns by vibration was also eliminated.

  Further, when the hydraulic motor is swiveling, if the hydraulic pressure is supplied to the swiveling hydraulic motor (not shown), the hydraulic pressure supplied to the shaving hydraulic motor (5) temporarily escapes and the shaving drum (20 ) Was greatly reduced and could not be cut stably. On the other hand, if the cutting is stopped while turning, the turning speed suddenly increases, and the turn may turn more than necessary. Since it is designed to turn with an electric motor, it is now possible to stably perform complex operations such as turning while cutting.

Further, the excavator (51) performs the cutting work while moving the constant thickness cutting device (8) in the direction of the operation direction (b) of the arm (50).
In recent years, waterproof construction works such as roads and old bridges are increasing. In this waterproof construction work that extends the life of the road, the road surface concrete is cut to a certain thickness and flattened, and then a waterproof sheet is applied or a waterproof coating is applied, and then asphalt is laid on the road surface on the bridge. To restore.

  Although the waterproof sheet is laid in the direction of the bridge length, the excavator (51) performs the cutting work while moving the constant thickness cutting device (8) in the direction of the operation direction (b) of the arm (50). For this reason, there is a case where a step of shaving (92) after the shaving of FIG. 6 occurs and the waterproof sheet is loosened. If there are steps on the cut surface, the waterproof sheet will tear at the bridge bundling for many years, causing air and moisture to enter and causing blistering. Therefore, the finished surface (also called the finished mold) after cutting is required. If blistering occurs, you must remove the tarpaulin and then re-expose the shaved surface and start over. The turning portion (2) of the constant-thickness shaving device (8) according to the present invention is turned so that the excavator (51) runs in the running direction (a) while turning and setting as shown in FIG. All of the remaining (91) can be shaved. Moreover, since it can cut similarly after a shaving (92) along a waterproof sheet adhesion direction, there is no level | step difference and the loosening of a waterproof sheet can be prevented.

  As shown in FIGS. 2 to 3, in the present invention, the depth adjusting shim (30) attached to the main body frame (1) is detachably attached to the lower portion of the liner portion (7). As shown in FIG. 8, the left and right widths of the liner portion (7) differ depending on the presence or absence of gears. The liner (81) having the cover (31) is wider. However, the conventional depth adjustment shim (30) may be a common depth adjustment shim (30) common to the left and right as long as the position of the shim mounting bolt (12) is taken into consideration even if the left and right are the same width, and the production cost is reduced be able to.

However, when the conventional constant thickness cutting device (9) to which such a depth adjusting shim (30) is attached receives a strong pressing force from the arm (50) of the hydraulic excavator in the pressing direction (d), the liner portion (7) In some cases, it is pushed up and deformed in the opposite direction (d ′) to the pressing force. Further, the liner portion (7) may be deformed by continuous vibration during cutting.
If the liner part (7) is deformed, the shim mounting bolt (12) cannot be removed or cannot be inserted even if it is tapped and the conventional depth adjustment shim (30) cannot be attached or detached. It was.

  In the present invention, as shown in FIG. 9, the width of the depth adjusting shim (30) is increased so as to cover the side plate a (35) and the side plate b (36) of the main body frame (1). As a result, the force of the pressing force (d) applied from the arm (50) to the main body frame (1) is directly transmitted to the depth adjusting shim (301) through the side plate a (35) and the side plate b (36). The liner portion (7) is no longer pushed and deformed in the counter-pressing direction (d ′) by the pressing force (d). Furthermore, the entire constant thickness shaving apparatus could be stabilized.

Further, in the shape like the conventional depth adjusting shim (30), the liner portion (7) is not only pushed and deformed in the opposite direction (d ′) to the pressing force, but also the main body frame.
In some cases, the scraping contact with the scraping gear (503) causes problems such as seizure. However, the depth adjustment shim (30) is widened and thickened so that the depth adjustment shim (30) is thickened to cover the side plate a (35) and the side plate b (36) of the main body frame (1). Is gone. Even when the excavator jacked up and applied a pressing force (d), the main body frame was not deformed and no malfunction occurred.

  At the beginning of the work, the hydraulic motor (5) is driven to rotate the shaving drum (20) and slowly hit the object to be cut (90) to repel the object to be cut (90) through the body frame (1) and the arm ( 50) Press down while pressing down to start cutting.

  Next, as shown in FIG. 10, when the depth adjusting shim (301) is brought into contact with the shaving surface (90), the depth adjusting shim (301) is obstructed and cannot be deeply cut. In this state, when the main body frame (1) is slowly moved using the arm (50) of the excavator in the cutting direction (e) of the upper cut, the bit (202) attached to the outer periphery of the cutting drum (20) is to be cut. When the object (90) is rotated by rotating upward from the bottom to the cutting direction, a cutting force is generated in the same direction as the pressing force (d), and the main body frame (1) is hidden in the object (90). Since the force (pd ′) to be applied is generated and balanced, the shaving work can be stably performed.

  This force (pd ') is canceled out by the depth adjusting shim (301), and the main body frame (1) is less vibrated, and is stably shaved in a calm state. Since the conventional asphalt shaving machine holds the shaving drum under the belly and presses it with its own weight, especially in the case of hard concrete, the entire asphalt cutting machine shakes and jumps and cannot be cut uniformly. On the other hand, the apparatus according to the present invention has only a shaving drum (20) pressed by a depth adjusting shim (301) and a hydraulic excavator, so that stable shaving can be obtained with less vibration.

  Thus, during the cutting operation, the bit (202) mounted on the cutting drum (20) and the depth adjusting shim (301) are mechanically balanced to cancel the force. What is important for reducing the vibration is the balance between the bit (202) and the depth adjustment shim (301), which is adjusted so that only the tip of the bit (202) comes out like a plane, and Stable shaving can be achieved by increasing the arrangement interval of the bits (202). Further, unlike the large asphalt shaving machine, the bit (202) does not jump up every time it hits the object to be cut (90), so there is little noise and vibration, and the finished shape of the shaved surface is clean. Since the bounce becomes smaller, repair of an old bridge can be performed gently and safely.

  The force (e ') opposite to the cutting direction (e) generated by the cutting operation is held by the arm (50) and the link (53) of the hydraulic excavator through the main body frame (1). That is, the vertical vibration (d, d ′) is canceled by the depth adjustment shim (301), and the front and rear vibrations (e, e ′) are canceled by the arm (50) and the link 53 to suppress the vibration. (1) and the object to be cut (90) are prevented from bouncing, and a clean finished surface can be obtained in which the cut surface does not rise up and down. Even an aging bridge that tends to resonate can be operated safely with little vibration.

  When the gear cover (31) attached to the main body frame (1) is removed as shown in FIG. 7, the motor gear (501) attached to the hydraulic motor (5) and the cutting drum gear (503) attached to the cutting drum (20). Then, the idle gear (502) that exposes the driving force of the motor gear (501) to the drum gear is exposed.

  As shown in FIG. 11, the central idle gear (502) is pivotally attached to an idle pin (32) attached to the main body frame (1). The grease supplied from the tip of the idle pin (32) through the grease nipple (33) is supplied to the bearing portion of the idle gear (502) through the grease hole (321).

  Even when the gear cover (31) is attached, the concrete powder at the time of cutting the concrete enters finely. In particular, the concrete powder that has entered the bearing portion of the idle gear (502) causes large friction by scraping hard concrete when the grease is cut, causing the bearing to be worn significantly and causing seizure. In addition, condensation caused the concrete powder to harden, reducing the life of the bearings. As described above, the grease supplied from the inside of the idle pin (32) is discharged from the idle gear bearing portion (323) into the gear cover (31) while entraining the concrete powder adhering to the bearing (35). 502) is always newly lubricated and lubricated. Unlike the bearing part, the tooth surface part does not rotate at high speed, so even if concrete powder is contained, the concrete powder will be discharged as long as it is lubricated and will not cause seizure.

  The grease discharged from the bearing portion (323) of the idle gear (502) is accumulated inside the gear cover (31). The grease inside the gear cover (31) is always renewed to the tooth surfaces of the motor gear (501), idle gear (502), and cutting gear (503). As a result, it accumulates in the gear cover to prevent wear of the gear.

When new grease is always supplied, the old grease is pressed against the wall surface of the cover (311), and when the grease vaporizes, only the concrete powder remains on the wall surface. New grease adheres to the tooth surfaces of each gear by vibration and rotation of each gear, thereby further preventing wear.
If the grease becomes old and the mixture of concrete powder increases, the wear rate increases. Therefore, if the grease is regularly changed by periodically cleaning the inside of the cover, the concrete powder in the idle gear bearing (322) will always be removed. Can be eliminated, leading to a longer service life.

Therefore, the idle bearing (46) attached to the idle pin (32) and supporting the rotation of the idle gear (502) and the idle bearing (46) attached to the cover (34) and attached to the idle pin (32) are pressed. The following effects can be obtained by providing a shaving device characterized by including a bearing retainer (40) that is firmly fixed.
When the idle bearing (46) seizes, the idle gear (502) rotates while falling off, the bearing retainer (40) wears and the mounting bolt (41) falls off, so that the abnormality inside the gear cover (34) can be judged from the outside.
If only the C-type retaining ring (39) is assembled, it will not be immediately apparent when it comes off due to an impact. Even if the bearing nut (60) is secured with the star washer (61), it is not known when it has fallen off due to vibration. In particular, if used continuously for many years, there is often no periodic inspection to open the cover (34). As a result, the idle gear (502) sometimes burns the idle pin (32) and wears the idle pin (32) and the idle bearing (46).
Since grease is greased once a day, it can be understood that if the grease nipple (33) of the grease greasing part is deformed, the idle pin (32) is deformed, but the idle bearing (46) and the idle gear (502) Since it is not known at the time of grease injection that there is an abnormality, it may be used for a long time with deformation. If the mounting bolt (41) is loosened or cut off, it can be noticed early before it becomes a fatal trouble and can be repaired as soon as possible.

Since the bearing retainer (40) presses the idle bearing (46) with an appropriate pressing force due to the fixing force of the cover (34) by the gear cover bolt (38) and the deflection force of the entire cover (34), looseness occurs for a long time. Absent.
Since the bearing presser (40) is pressed by the deflection force of the entire cover (34), the presser can continue to be pressed loosely and elastically. If the gear cover bolt (38) comes loose, the grease leaks out and can be judged visually.

  If the base end portion of the idle pin (32) is fixed to the main body by welding (322) and the tip end portion is pressed and fixed by the bearing retainer (40), the idle pin (32) is held at both ends. As a result, it has a strong structure that is strong against vibrations and shocks and has a long service life.

The following effects can be obtained by providing a shaving device characterized in that the gap between the bearing retainer (40) and the idle gear (502) rotating portion is 2 mm or less and the length of the gap is 2 mm or more.
By attaching to the gear cover (34), the gap between the bearing retainer (40) and the idle bearing (46) can be reduced to 2 m or less, and grease supplied from the center of the idle pin (32) can be reduced to the idle bearing (as much as possible). 46). The C-type retaining ring (39) and bearing nut (60), which have a groove (319) processed and attached to the idle pin (32), use an off-the-shelf product, so the clearance is set to be 9 mm or more and the clearance is reduced. You can't do it, and the grease you've lubricated will run out and stay.

However, if the bearing holder (40) is set so that the gap through which the grease flows out is 2 mm or less and the length of the gap is 2 mm or more, the grease is retained inside the idle bearing (46). Even if there is a processing error or assembly error, if the bearing retainer (40) is set so that the gap is 2 mm or less and the length of the gap is 2 mm or more, it can be assembled even if it is within the industry standard. There is no contact between the rotating part and the fixed part, it can be commercialized even if the finishing process is not precisely defined, and it is inexpensive and safe.
If there is only a small gap and the distance is long, the grease stays in the idle bearing (46), and the old grease protrudes from the gap as it is lubricated with new grease. New grease is supplied and stays for a long period of time, extending the life of the idle bearing (46).
Further, if there is only a small gap and the distance is long, even grease that has started to melt due to heat generated by rotation of the idle bearing (46) can remain inside the idle bearing (46).

If the gap is reduced and grease is filled in the idle bearing (46) as much as possible to fill the inside of the bearing, moisture cannot enter the idle bearing (46) and rust can be prevented. In addition, since the water generated upon condensation is difficult to enter through the gap, the grease is difficult to emulsify.
In addition, sand and metal debris are less likely to enter the bearing, reducing the bearing failure rate and extending the service life.
Since the gap is small, even if there is a slight abnormality in the rotating part of the idle gear (502) or the rotating part of the idle bearing (46), an abnormal noise is generated when contacting the bearing retainer (40). The occurrence of an abnormality such as the idle bearing (46) being removed, the idle gear (502) being removed, or the welding of the idle pin (32) being peeled off can be immediately determined by the occurrence of abnormal noise.

A C-type retaining ring (39) attached to the idle pin (32) to prevent the idle bearing (46) from falling off, and a bare link retainer (40) to cover the C-type retaining ring (39) so that it does not fall out The following effects can be obtained by providing a shaving device characterized by comprising: The C-type retaining ring (39) can be prevented from spreading and coming off due to an impact caused by vibration. However, since the C-type retaining ring (39) only prevents the idle bearing (46) from falling off and does not act to press the idle bearing (46), the idle bearing (46) may be worn and rattled. It was.
Both the C-type retaining ring (39) and the bearing retainer (40) can be configured not to remove the idle bearing (46), thereby preventing double disengagement. When the idle pin (32) is worn and deformed, or the welded part (322) is peeled off, the mounting bolt (41) with the bearing retainer (40) attached to the cover (34) begins to loosen. A change in the cover (34) can be determined at an early stage.

The following effects can be obtained by providing a shaving device including a bearing retainer (40) made thicker than the gap between the gear cover (34) and the idle bearing (46).
The bearing retainer (40) made a little thicker holds the idle bearing (46) by the deflection of the cover (34) and keeps the idle bearing (46) long-life even if it wears slightly and becomes loose. Can be converted.

The following effects can be obtained by providing a shaving device characterized in that a pressing thickness adjusting shim (49) is inserted between the gear cover (34) and the bearing retainer (40).
When the cover (34) extends and the force to press the bearing retainer (40) against the idle bearing (46) disappears, or when the idle bearing (46) wears and becomes loose, the cover (34) and the bearing retainer increase. The pressing force of the bearing retainer (40) can be increased by inserting and mounting the pressing thickness adjusting shim (49) between the bearing retainer (40) and (40). As a result, the pressing force is adjusted by adjusting the pressing thickness adjusting shim (49) even if the cover (34) is deformed and stretched and the pressing force is insufficient, or the idle bearing (46) is worn and rattled. It is a thing that can keep the right.

It is a perspective view of the conventional constant thickness shaving apparatus. 1 is a side view of a constant thickness cutting apparatus according to the present invention. It is a perspective view of the conventional shaving depth adjustment shim. It is a side view of the conventional shaving depth adjustment shim. It is a side view of the cutting depth adjustment shim which concerns on this invention. 1 illustrates a road surface cutting method according to the present invention. It is a perspective view of the constant thickness cutting apparatus which concerns on this invention. It is a figure of the conventional shaving depth adjustment shim. It is a figure of the depth adjustment shim which concerns on this invention. It is a side view of the cutting depth adjustment shim which concerns on this invention. It is a perspective view of an idle pin concerning the present invention. It is AA sectional drawing of the idle bearing part of the constant thickness cutting apparatus which concerns on this invention. It is sectional drawing of the idle bearing part of the conventional constant thickness cutting apparatus.

FIG. 1 shows an embodiment of a conventional constant thickness shaving apparatus. The main body frame 1 is swung in a bracket (10) attached to the tip of an arm (50) of a hydraulic excavator (51) as shown in FIG. 6 via a hydraulic cylinder (52) and a link (53). It is attached so as to swing in (c).
When the hydraulic pressure is supplied from the hydraulic excavator (51), the shaving hydraulic motor (5) in the main body frame (1) is rotated and shaved via the motor gear (501), idle gear (502), and shaving gear (503). Rotate the drum (20). The cutting object (concrete) surface (90) is cut by pressing the cutting drum in the pressing direction (d) by the arm (50) while rotating the cutting drum (20). The shaving part (100) is moved by moving the constant thickness shaving device (8) in the shaving direction (e) by the linear pulling operation in the shaving direction e of the excavator (51) with the shaving drum (20) rotated and pressed. Is made.

  In the shaving operation, the shaving drum (20) is pressed in the pressing direction (d) by the arm (50) of the hydraulic excavator (51), and the first shaving is performed. When the concrete surface (90) comes into contact with the liner (7), it can no longer be cut in the pressing direction (d). By moving in the cutting direction (e) in this state, the cutting bit (21) is rotated in the rotation direction (f) and the cutting target (concrete) surface (90) is undercut from below to above. The action of trying to dive the shaving drum (20) down (in the d direction) and the liner portion (7) abuts against the concrete surface (90) so that the shaving drum (20) does not dive (anti-d). The direction (in the direction) is balanced, resulting in a clean finish with little vibration.

There is a turning part (2) between the bracket (10) and the main body frame (1), and the main body frame (1) can be turned to change the shaving direction of the shaving drum (20). When the shaving part (2) is driven to change the shaving direction of the shaving drum (20), the shaving direction (e) also changes, so that the arm (50) of the excavator (51) is turned up and down and the excavator (51) is turned. We make use of and driving.
FIG. 1 shows a conventional constant-thickness shaving device (9), in which a swivel unit (2) is shown in a simplified manner, but hydraulic pressure is supplied from a hydraulic excavator (51) to a swivel hydraulic motor (not shown). Turn.

FIG. 2 shows an embodiment according to the present invention. A depth change type adjustment shim (301) is attached to the lower end of the main body frame (1), and the position (y) is at the maximum cutting depth (α) as shown in FIG. The position (z) is a point where the cutting depth is (α) / 2, and the position (x) is a point where the cutting depth is 0.
If you want to cut only the convex part (the part raised by the scissors etc.) and finish it into a flat surface, extend the cylinder (52) and tilt the constant thickness shaving device (8) to place the position (x) on the concrete surface (90). If the constant thickness shaving device (8) is moved in the shaving direction (e) as it is pressed, only the protruding part protruding like a hump can be shaved and finished into a flat surface.

As shown in FIG. 3, the main body frame (1) and the conventional shaving depth adjusting shim (30) are detachably attached by bolts (12) provided on the liner portion (7). This prevents the liner portion (7) from being worn by being pressed against the concrete surface (90).
The distance between the conventional cutting depth adjustment shim (30) and the maximum cutting depth (α) by the bit (21) is in the state shown in FIG. 4, and the maximum cutting depth (α) extends and retracts the cylinder (51). Even if the main body frame (1) is tilted, it does not change, and the uneven surface cannot be evenly finished. It is good when the same depth is constant.

A cutting depth changing type adjustment shim (301) in which the cutting depth is changed by the inclination of the main body frame (1) according to the present invention will be described with reference to FIG.
The cutting depth adjusting shim (301) removably attached to the liner portion (7) of the main body frame 1 with a bolt (12) is a portion where the portion at the position (y) becomes the maximum cutting depth (α). This is a point where the position (z) becomes the cutting depth of (α) / 2, and the position (x) is a point where the cutting depth becomes zero.
When the main body frame (1) is pressed vertically against the concrete surface (90), the contact point is (y) and the shaving depth is (α). When the main body frame 1 is tilted by (g) and pressed at the contact point (z), the cutting depth is (α) / 2. When the main body frame (1) is further tilted by (h) and pressed at the contact point (x), the cutting depth becomes 0 and only the convex portion can be cut.

The operator of the hydraulic excavator (51) adjusts the angle of the body frame (1) by expanding and contracting the cylinder (52) while rotating the shaving drum (20), and presses the position (y) portion against the concrete surface (90). Then, shaving is performed until the position (y) of the shaving depth changing type adjustment shim (301) abuts on the concrete surface (9), and shaving is performed at the maximum shaving depth (α), thereby forming a recess with a drum radius (201). .
Then, if the main body frame (1) is slowly drawn straight in the direction of cutting so as not to stop the rotation of the shaving drum (20), a strip-shaped shaving band (100) having a depth (α) and a width (β) as depicted in FIG. ) Is formed. When the cutting depth is insufficient, the width of the cutting strip (100) is slightly shifted so that the width is equal to or larger than (β) ′, and then the left and right liner parts (7) are removed from the cutting strip (100). If it is expanded and cut so that it can go inside, a cutting band with a depth twice that of (α) can be created.

Next, when creating a cutting strip (100) with a cutting depth of (α) / 2, the body frame (1) is tilted so that the position (z) abuts on the concrete surface (90), and cutting is started. Then, if the main body frame (1) is linearly drawn in the cutting direction (e) so as not to stop the rotation of the cutting drum (20), a cutting band (100) having a cutting depth (α) / 2 is created.
When a left uncut convex portion is formed between the two scraped bands (100), the main body frame (1) may be tilted so that the position (x) is in contact with the left uncut convex portion.
If such a work is repeated many times, even on the road surface on the bridge, it is possible to cut up to a certain level with a predetermined cutting depth. By tilting the main body frame (1) as described above, an arbitrary cutting depth can be obtained and a flat finish can be achieved. In some cases, the cutting depth adjustment shim (301) as shown in FIG. 5 can be manufactured at a lower cost than the cutting depth adjustment shim (30) as shown in FIG.

  Next, the swivel part of the constant thickness cutting apparatus (8) according to the present application will be described with reference to FIG. A hydraulic motor (not shown) has been used for the swivel portion (2) of the conventional constant thickness cutting device (9). The cutting and turning are performed simultaneously when, for example, cutting around a manhole. When turning while cutting, the arm (50) must turn while being pressed firmly against the concrete surface (90), and a combined operation of two hydraulic circuits is required.

In the case of a hydraulic motor, it can be easily supplied if the hydraulic excavator (51) has piping.
However, the piping of the hydraulic motor requires three pipes for the line, the return, and the drain. In order to drive the two hydraulic motors for turning and cutting, six pipes are provided in the hydraulic excavator (51). In other words, small hydraulic excavators and small hydraulic excavators with small rear swings are expensive and require extensive modification. However, if there is only one hydraulic motor, there are many hydraulic excavators (51) equipped with a hydraulic pipe for attaching a general-purpose attachment such as a hydraulic breaker.

When the two hydraulic motors were driven, the combined operation of turning at the same time as the shaving resulted in a significant drop in hydraulic pressure in either hydraulic motor, causing problems in delicate operations.
For example, if the turning motor is driven while the shaving drum (20) is rotated, the oil pressure of the shaving hydraulic motor (5) is momentarily lost and the shaving becomes inertia, and when it is severe, the turning drum (20) stops rotating. was there.
Therefore, in the present invention, the electric motor (40) is used for turning. As a result, the electric motor (40) is driven by wiring from the battery of the hydraulic excavator (51), so the hydraulic excavator need not have any special hydraulic piping, and can be retrofitted to the hydraulic excavator that has been used so far. A constant-thickness cutting device (8) with a turning mechanism can be attached.

In addition, compound operations such as turning while cutting work are also performed by the hydraulic motor (5), and since the turning is an electric motor (40), the motor rotational force is supplied by a completely different system, so even if compound operations are performed simultaneously, Smooth operation without interference.
The electric motor (40) turns the main body frame 1 through a turning wheel (42) through a gear (using a planetary gear mechanism or a worm wheel mechanism) in the gear box (41).
The hydraulic pressure supplied to the hydraulic motor (5) is such that the hydraulic oil supplied from the hydraulic excavator (51) by hydraulic piping is supplied from the hydraulic port (41) to the hydraulic motor (51) via the rotary valve (43). It has become.
Next, the road surface cutting method using the depth change type adjustment shim (301) and the electric motor (40) will be described with reference to FIG. The constant thickness shaving device (8) attached to the hydraulic excavator (51) creates a shaving band (100) in the arm operation direction (b).

The excavator (51) works in the b direction when it is on a bridge, so the uncut portion (91) can be left and the cut mark (92) becomes a V-shaped pattern when viewed from above the bridge. When a waterproof sheet is pasted on the surface, a step is formed, and after many years, air and water enter due to repeated bounce of the bridge (the sheet is torn or a hole is made), causing problems such as blistering.
Therefore, I want to finish the final finishing direction of the shaving in the bridge length direction (k). Moreover, the shaving method concerning the said invention was proposed by the desire to remove uncut material (91).

The finishing method is as follows. First, the crawler belt (55) of the hydraulic excavator (51) is arranged in parallel with the bridge length direction (k), and then the arm is arranged on the upper part (91) of the uncut surface of the road surface on the bridge. 8) Create a shaving band (100) while placing the excavator (51) slowly back in the a direction by arranging the shaving direction (e), crawler belt (55) and bridge length direction (k) in parallel. To do.
With this construction method, all the uncut material (91) can be removed. Further, by changing the position of the arm of the hydraulic excavator and performing the same cutting work, the entire road surface on the bridge can be cut without being left uncut (91). If the final finish is shaved at the position (x) of the shaving depth adjustment shim (301), the flat surface can be finished without the shaving trace (91) and uncut residue (91). Since there is no shaving mark (92), it becomes impossible to make a step on the waterproof sheet, and after the appropriate bridge waterproofing construction work has been performed, the asphalt to be constructed on the waterproof sheet is regularly maintained thereafter. This promises to extend the life of the bridge. The hand is a work method that is effective for constant pressure cutting instead of fishing.

In the case of the conventional constant thickness shaving device (9) as shown in FIG. 1, it is necessary to move the arm (50) so as to drag in the shaving direction (e) while pressing with a strong force in the pushing direction (d).
As a result, the pressing force (d) transmits most of the force to the conventional depth adjustment shim (30).
The cover (11) abuts on the cover (11), and the deformed liner portion (7) prevents the depth adjusting shim mounting bolt (12) from coming off. Even if the bolt (12) is forcibly extracted, the mounting bolt (12) cannot be inserted when it is assembled, and the conventional depth adjusting shim (30) may not be mounted.

Further, the conventional depth adjustment shim (30) is symmetrical, and the side plate a side liner portion (7a) and the side plate b side liner portion (7b) can be attached with the same depth adjustment shim (30). The cost was reduced.
However, if the depth adjustment shim (30) is used without replacement for a long time,
This causes the part to burn out.

Further, the side plate ab (35.36) and the liner portion (7) are fixed by welding (37), but the welded bead surface is exposed, so that it is worn by the shaving surface or shavings.
Therefore, in the present invention, as shown in FIG. 9, the pressing force (d) is applied with a strong force by adjusting the depth with members having different widths on the left and right, such as a cutting depth adjusting shim (301) according to the present invention. Even if it occurs, the pressing force (d) transmitted from the side plate ab (35.36) is directly transmitted to the shaving depth adjusting shim (301), so that the liner portion (7) can be prevented from being deformed. .

Since the width of the shaving depth adjusting shim (301) is large and thick, it can withstand long-term wear, and the time for replacement has been extended. Because it is hard to wear, even if it is used at the same site for a long time, it can be cut at the same depth, and further, the amount of material to be reworked when returning to the original state can be quantified.
Further, the liner part (7) and the side plates (a, b) (35, 36) are fixed by welding of the welded part (37), but contact with the shaving surface (90) and shavings are removed from the shaving drum ( 20) The welded part (37) is worn by the entrainment of 20) and sometimes weakens. As the depth adjustment shim (301) is wide and thick, the welded portion (37) and the liner portion (7) can be guarded to prevent the influence.

  Further, the conventional depth adjusting shim (30) and the depth adjusting shim (301) according to the present invention are detachably attached to the liner portion (7) fixed to the main body plate (1) by welding with the bolt (12). It is done. However, when the liner part (7) is deformed in the counter-pressing pressure (d ′) direction due to the pressing pressure (d) or due to repeated vibration for a long time, the bolt (12) cannot be removed or inserted. was there.

Therefore, as shown in FIG. 10, the bolt (12) can be easily removed and inserted by making the bolt hole of the liner portion (7) into a long hole (71) in the cutting direction.
In particular, since the bolt hole of the liner portion (7) can be processed with a laser processing machine or a fusing machine, long hole processing can be easily performed. On the other hand, the adjustment shim (301) is processed by machining, so that a round hole can be processed by a drill. However, long hole processing is expensive because it requires machining that can be milled. In order to make the cost by machining cheaper, it is more economical to make the bolt hole of the liner part (7) into the long hole (71) than the adjustment shim (301). A long hole (71) allows the depth adjustment shim (301) of the same structure to be attached to and detached from the V-shaped liner part (7) with the bolt (12) attached.

  With continued reference to FIG. The driving force generated by the hydraulic motor (5) is transmitted to the grinding drum (20) through the motor gear (501), the idle gear (502), and the grinding gear (503). Since the motor gear (501) is directly attached to the shaft of the hydraulic motor (5), there is no need to grease up, but the shaft and the side plate a (35) to which the idle gear (502) and the cutting gear (503) are attached. A bearing mechanism such as a bearing is required at the boundary.

  In recent years, some bearings contain grease, enabling maintenance-free operation. However, when the lifetime is exceeded, the encapsulated grease may be dried and seized. In particular, when the cut material is hard, the life is shortened. When the object to be cut (90) is concrete, a large amount of concrete dust is generated. Therefore, in order to protect the gears, the gear cover (31) is attached. In addition, a gear cover (31) was attached for safety so that fingers would not be caught between gears. If it does so, it will be left as it is and the replacement of the bearing will be forgotten within a specified time, and the enclosed grease will dry out and disappear. As a result, burn-in occurs. If the machine is rented out as a leasing machine without noticing that the grease has run out, or if it is recognized that grease is not required, management may not be complete and a problem may occur.

  In the gear cover (34) according to the present invention, the caulking is strengthened so that grease is collected, and the idle gear bearing (323) and the shaving gear bearing (not shown) can be lubricated from the outside of the gear cover (34). As a result, the gear was protected by a tightly-covered gear cover (34) and only a small amount of shavings was required. In addition, it is no longer necessary to replace the bearings in the bearing because it only needs to be lubricated.

  Further, the excess grease supplied to the idle gear bearing portion (323) pushes out the shavings that have entered the idle pin bearing portion and moves in the gear cover (34) during vibration or swing motion and adheres to the tooth surface of the gear. Abrasion is prevented. As a result, the bearing portion (323) is not seized and wear of each gear tooth surface is prevented, and long-term continuous cutting work becomes possible.

  Further, FIG. 1 will be described. The cutting method of the conventional constant thickness cutting device (9) varies, and the cutting direction e is a guideline and is not stipulated, and is used by turning it 180 degrees using the turning portion (2). However, the cutting direction e according to the present invention refers to the direction in which the bit (202) contacts the object to be cut by upper rotation. Generally, an attachment attached to the arm (50) of the hydraulic excavator is basically pulled in the arm operation direction (b), which is an operation called a backhoe.

Further, when the shaving drum (20) is pressed against the shaving surface (90) and the depth adjusting shim (30) comes into contact with the shaving surface (90) and can no longer be shaved further, it is lifted once and the shaving drum (20) There is also a method of forming the shaving portion (100) by repeating the operation of increasing the number of rotations and moving it slightly in the shaving direction (e) and pressing it again.
Therefore, as shown in FIG. 10, in the present invention, when a predetermined depth is cut, the cutting drum (20) is shifted by the force of the arm (50) in the cutting direction (e) while the pressing pressure (d) is applied as it is. The body frame (1) is moved by the arm (50) (as dragged).

The force vector of the shaving bit (21) at this time is the tangential force (p) of the shaving drum radius (201). This force is decomposed into a force (pe) in the cutting direction and a force (pd ′) in the counter-pressing direction. The cutting direction force (pe) is used to cut the object to be cut (90) horizontally. The counter-pressing pressure (pd ') is suppressed by the depth adjusting shim (30.301), although the constant thickness shaving device (9) tries to be hidden in the object to be shaved. Such a phenomenon reduces vibration and noise.
Even if the arm (50) is not always pressed with a strong force, the constant-thickness shaving device (8) may be moved so as to slowly increase the number of revolutions of the shaving drum (20) in the shaving direction.

  By changing the cutting force to the pressing pressure (pd ') by cutting with the upper rotation and placing the depth adjustment shim (30.301) in the immediate vicinity to offset the force, a sturdy and light cutting machine is provided It was possible to perform construction with good finish.

  Next, the constant thickness shaving apparatus (8) according to the present invention shown in FIG. 7 will be described. No depth adjusting shim (30.301) is described in the conventional constant thickness machine (9) of FIG. Further, the grease hole (313) for supplying grease to the cover (11) is not described. The gear cover (34) of FIG. 7 is adhered and fixed to the side plate a (35) with bolts (38).

The gear cover (34) has a grease hole (313) so that the idle gear bearing (323) and the shaving gear (503) can be lubricated from the outside of the gear cover (34). If grease is supplied more than necessary (most of the greasing operations are more than enough), unnecessary grease is discharged into the cover (311).
Even if fine cut dust enters the idle gear bearing (323), it is discharged by the grease and accumulated in the gear cover (34), and when the body frame (1) is swung up by a hydraulic excavator or vibration during shaving The new grease always adheres to the tooth surface of the gear to prevent wear.

  The depth adjustment shim (301) shown in FIG. 9 has substantially the same width as the liner portion (81) according to the present invention, and a bolt is inserted into the elongated hole (72) to thereby make the depth adjustment shim according to the present invention. (301) is fixed. The depth adjusting shim (301) according to the present invention, which will be described in detail with reference to FIGS. 9 and 10, covers a width (x) just below the side plate ab (35.36) and does not contact the bit (20) ( g'g '). As a result, even if a strong pressing force (d) is applied to the side plate ab (35.36), it is transmitted to the depth adjustment shim (301) directly below, and the liner portion (81) is not deformed.

  Next, FIG. 8 will be described. FIG. 8 describes a conventional depth adjustment shim (30). The conventional depth adjusting shim (30) is attached to the liner portion (7) by shim mounting bolts (12). The arm (50) lowers the main body frame (1) in the direction of the pressing pressure (d), and the bit (202) scrapes the object to be cut (90). When cutting to the depth (h), the conventional depth adjusting shim (30) is in contact with the cutting surface (the object to be cut 90) and is controlled not to cut deeper than the depth (h).

  The conventional depth adjusting shim (30) is fixed to the liner portion (7) by a shim mounting bolt (12). The liner portion (7) is fixed to the side plate ab (35, 36) of the main body frame (1) by a welded portion (37). Since the side plate ab (35, 36) arranged in the vertical direction and the liner portion (7) arranged in the horizontal direction must be welded, nearly half of the thickness of the side plate ab (35, 36) is welded. Instead, it must be free for the bead and only a limited number of welds can be secured.

As shown in FIG. 8, when a pressing force (d) is applied here from the side plates ab (35, 36) of the main body frame (1), the force is transmitted to the liner portion (7) and the conventional depth adjusting shim (30). It is transmitted to. At this time, in particular, the liner portion (7) on the side plate a (35) side is subjected to the counter-pressing pressure (d ′).
It will be lost.
In addition to not being able to keep the cutting depth constant, the gear cover (31) may not be able to be removed by coming into contact with the gear cover (31).

Then, shavings come into contact with the welded portion (37) and are worn. Also side plate
This may cause burn-in of the shaving gear (503). In view of such a situation, a depth adjustment shim (301) according to the present invention as shown in FIG. 9 is provided.

  The depth adjusting shim (301) according to the present invention is made with a width (g.g ′) so as to cover the liner portion (7), and a strong pressing force (d) from the side plate ab (35, 36). ) Is applied for a long time, a bending force that deforms the liner portion (7) does not occur, and is transmitted straight to the depth adjusting shim (301) according to the present invention and transmitted from the force point X to the cutting object (90). Therefore, deformation of the liner portion (7) can be prevented.

Further, since the width (g.g ′) of the depth adjusting shim (301) according to the present invention is widened, it is possible to prevent the welded portion (37) from being worn by shavings.
However, the depth adjustment shim (301) according to the present invention is made larger on the side plate a (35) side than on the side plate b (36) side, and a separate one is produced. This is because the gear cover 311 is immediately above and it is considered difficult to insert the nut at the time of installation. Depending on the positioning of the bolt holes, the depth adjustment shims on the left and right may be used to adjust the depth according to the present invention. A thickness adjustment shim (301) can also be produced and used.

The gear cover (311) is provided with a grease hole (313), and new grease can be always supplied to the bearing portions of the shaving gear (503) and the idle gear (502) from the outside.
The gear cover (34) is attached in close contact with the side plate a (35) by bolts (312) so that it can be easily attached and detached, and the idle gear bearing portion (323) is provided inside the gear cover (34). There is a function to store the grease pushed out as extra. The grease adheres to the tooth surfaces of the gears and is lubricated by vibrations, swinging up or moving the body frame (1).

  Next, a depth adjustment shim (301) according to the present invention will be described with reference to FIG. The liner part (7) fixed to the main body plate (1) with the welded part (37) is provided with a long hole (72), and the depth adjusting shim (301) according to the present invention can be detachably attached by the bolt 12. Is fixed. The long hole (72) is a long hole (72) along the cutting direction (e) and the counter-cutting direction (e ′), and the liner portion (7) is temporarily deformed in the counter-pressing pressure direction (d ′). The bolt (12) can be inserted and removed.

  In addition, the depth adjustment shim (301) has a U-shaped mounting surface. At the time of assembly, the depth adjustment shim (301) is adhered to the liner portion (7) and bolts (12) are inserted one by one. Can do. However, after working for a while, powder at the time of cutting accumulates in the bolt hole (333) of the depth adjustment shim (301) and the bolt (12) cannot be removed. At this time, the bolt (12) must be removed with the depth adjusting shim (301) attached, but the bolt hole formed in the liner portion (7) must be a long hole (71). Further, it is possible to cope with the outer shape of the shim being circular or other shapes.

  In other words, the attachment part of the depth adjustment shim (301) is angled so that it can be pulled out straight if it is one by one, but when it is attached to the depth adjustment shim (301), the liner part If the long hole (71) is not arranged in (7), it cannot be attached or detached. In order to prevent such a situation, the bolt hole formed in the liner portion (7) has a long hole structure along the cutting direction (e) or the counter-cutting direction (e ').

Further, the operation of the bit (21) will be described with reference to FIG. The bit (21) attached to the sharpening drum (20) sharpens the sharpening object (90) in the vector direction of the sharpening force p along the tangent to the sharpening drum radius (201). The cutting force p is decomposed into a cutting direction force (pe) and a counter-pressing pressure (pd ′). The main body frame (1) tries to sink into the object to be cut (90) by the counter-pressing pressure (pd ′). The counter pressure (pd ′) is offset by the depth adjustment shim (301), and stable cutting is performed. Therefore, the depth adjustment shim (301) and the liner part (7) must be made robustly to withstand repeated loads.
Also, the depth adjustment shim (301) must be able to be quickly replaced in the field when worn. The setting of the cutting depth of the bit (21) and the depth adjusting shim (301) at this time is the most important.

Next, FIG. 11 will be described. The idle pin (32) attaches an idle gear bearing (322) to rotate the idle gear (502), and transmits the driving force of the motor gear (501) to the shaving gear (503).
A grease nipple (33) is attached to the center of the idle pin (32). The grease nipple hole (34) is connected to the grease hole (321), and the grease supplied from the grease nipple (33) is supplied to the idle gear bearing portion (322) via the grease hole (321). Excess grease is discharged and stored in the gear cover (34) at the idle gear bearing (322).
Grease supply to the grease nipple (33) is supplied from a grease hole (313) formed in the cover (34) by a grease gun (not shown).

FIG. 1 is a perspective view of a conventional constant thickness shaving apparatus. The constant thickness shaving device (9) attached to the tip of the arm (50) of the hydraulic excavator is swingably attached via a link (53) by a cylinder (52) of the hydraulic excavator. The constant-thickness cutting device (9) performs cutting by the rotation of the cutting drum 20 pressed against the cutting object (90) by the arm (50) of the excavator and the cylinder (52) of the excavator.
The rotation of the cutting drum (20) drives the hydraulic motor (5) by connecting the hydraulic pressure piped from a hydraulic excavator (not shown) to the hydraulic motor (5). The motor gear (501) attached to the hydraulic motor (5) transmits the rotational force to the idle gear (502) and is transmitted to the shaving gear (503), so that the shaving drum (20) rotates and is fixed to the shaving drum (20). The bit (21) thus rotated rotates in the F direction to cut the cutting object (90).
In the state where the liner part (7) for adjusting the cutting depth is pressed against the object to be cut (90), the cutting drum (20) is rotated while being pressed in the d direction by the force of a hydraulic excavator (not shown). When pulled horizontally, the constant-thickness cutting device (9) cuts in the e direction at a constant depth. This creates a shaving part (100).

The motor gear (501), the idle gear (502), and the shaving gear (503) are lubricated and covered with a gear cover (34) in order to avoid contamination.
When concrete or asphalt is shaved using the constant-thickness shaving device (9), dust rises and adheres to the triple gear (501.52.503), causing gear teeth to wear and vibration noise to increase, causing tooth spillage. Will reduce the transmission power of the gear. In addition, if dust is mixed with grease, precision parts such as bearings are worn, and the service life is remarkably shortened.
The gear cover (34) conventionally protects the triple gear (501.52.503) from contamination of dust and relics.
FIG. 2 is a perspective view with the cover (34) removed from the constant thickness shaving apparatus according to the present invention.

The bearing retainer (40) attached to the back side of the gear cover (34) by the mounting bolt (41) covers the idle pin (32) by attaching the gear cover (34) to the main body frame (1) by the gear cover bolt (38). The idle bearing (46) that is fixed and used for the rotating part is pressed so as not to rattle. By means of a bearing retainer (40) made thicker by a width λ than the gap μ between the gear cover (34) and the idle bearing (46), the surface of the gear cover (34) is attached to the outside by being attached by a gear cover bolt (38). It begins to swell. This causes the bearing retainer (40) to press the idle bearing (46) to restrain the play. Further, since the bearing retainer (40) is mounted so as to be pressed against the idle pin (32), the idle pin (32) is configured to be held at the tip.
When the pressing force is insufficient, the pressing thickness can be adjusted by sandwiching the pressing thickness adjusting shim (49) between the bearing presser (40) and the cover (34).

Referring again to FIG. 7, the rotational force generated by the hydraulic motor (5) is transmitted from the idle gear (502) to the drum gear (503) via the motor gear (501), and the cutting drum (20) is rotated to perform cutting. The object (90) is cut. Since the radius of the shaving drum (20) cannot be increased without an idle gear (502) structurally, the configuration of a triple gear (501.502.503) is always required when the drum (20) is increased. It is.
In the constant thickness cutting device (8) according to the present invention, the liner portion (7) adjusts the cutting depth, but depending on the operation of a hydraulic excavator (not shown), it hits the cutting object (90) or bit ( 21), the heavy parts are often damaged due to their own weight.
In particular, since the idle pin (32) has a large and heavy idle gear (502), even if the base end portion of the idle pin (32) is firmly fixed by welding, the welded portion is peeled off by impact and the idle pin (32) is detached. There was a thing.

The motor gear (501) is a relatively small gear attached to the hydraulic motor (5), and the performance against impact and vibration depends on the performance of the hydraulic motor (5).
The idle pin (32) to which the idle gear (502) is attached has an idle bearing (46) in the bearing portion. Even pins that are inherently weldable are hard and hard materials with high carbon content are difficult to weld. Materials that are easy to weld are cheap but soft and often have a low yield point.
Therefore, a grease nipple (33) attachment portion is required in the center portion, and the idle pin (32) having the greasing hole (34) is made fragile. Therefore, until now, grease sealed bearings (not shown) have been used. Grease-filled bearings are filled with grease, so there is no need to grease them every day, but even if they are not used for a long period of time, the grease will evaporate after a certain period of time. Need. In addition, grease-filled bearings have many ball bearings and are vulnerable to vibration and shock.

  In order to use a bearing (46) that is strong against impact and has a large load capacity, a structure that can be periodically greased is required. Further, in order to fix the idle gear (502) and the idle bearing (46), a simple fastener called a C-type retaining ring (39) is used. However, the C-type retaining ring (39) sometimes flies off and comes off when there is an impact. Further, when the radius or C chamfering of the corner portion of the idle bearing (46) to be fixed is large, the fulcrum of the load applied to the retaining ring changes, so there is a risk of dropping from the groove (319).

FIG. 7 is a perspective view in which the gear cover (34) is removed so that the triple gear (501.502.503) can be seen, and using a mounting bolt (41) on the gear cover (34), the pressing thickness adjusting shim (49) and the bearing The state in which the cover (34) is attached to the main body frame (1) using the cover bolt (38) with the presser (40) attached.
Incorporating the gear cover (34) indicates that the bearing retainer (40) is assembled to press the idle bearing (46). The grease nipple (33) in the center of the idle pin (32) can be lubricated from the greasing hole (313).
FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2 showing an apparatus according to the present invention. A greasing hole (34) is formed in an idle pin (32) fixed to the main body frame (1) with a welded portion (322). The grease is supplied from the grease nipple (33), passed through the grease supply hole (34), and supplied to the central portion of the idle bearing (46) to be greased up.

The idle pin (32) is made of a hard and strong material so that it will not break even if the greasing hole (34) is made. However, the weldability is poor by that amount, and it is necessary to pay sufficient attention to heat after welding.
The driving force applied from the hydraulic motor (5) is transmitted to the drum gear (503) through the idle gear (502). The idle gear (502) is attached to the idle pin (32) with an idle bearing (46) as a bearing.
An idle bearing (46) is attached to the bearing portion of the idle pin (32) which is welded and fixed to the main body frame (1) by the welded portion (322). An idle gear (502) is attached to the outside, and the idle gear (502) is rotated by the rotational force transmitted from the motor gear (501).

  The grease supplied through the grease nipple (33) from the grease hole (313) outside the gear cover (34) protecting the gear from dust and dust passes through the grease hole (321), and then two idle bearings (46). Grease in the middle of the water and spread to the rotating part. The conventional structure had only a C-type retaining ring (39), but the grease supplied easily flowed out of the gap (o) and remained in the idle bearing (46). As a result, neglecting grease even once caused insufficient grease at the rotating part, resulting in increased play and seizure.

FIG. 13 is a cross-sectional view of an idle bearing (46) portion of a conventional constant-thickness milling device, which uses a bearing nut (60) and a star washer (61). The gap through which grease flows is a gap of ω. With the clearance o of the C-type retaining ring (39), it was not much different. Further, the idle pin (32) requires a screw processing for attaching the bearing nut (60) and a keyway processing for attaching the star washer (61), which increases the processing cost and is difficult to weld. Will become even more vulnerable.
Furthermore, since the greasing hole (34) is opened in the center of the idle pin (32), the strength of the pin is lowered and it is easy to break. Therefore, if a material with high tensile strength is used, the weldability is deteriorated, and vibration or impact The C-type retaining ring (39) may be bent due to fine and partial seizure, or may be peeled off from the welded portion (322).
As shown in FIG. 12, by pressing from the tip of the idle pin (32) with the bearing retainer (40), the idle pin (32) is in a double-supported state, and is resistant to vibration shock and is difficult to bend and break.
Further, the bearing retainer (40) will be described with reference to FIGS. The bearing retainer (40) has a washer-like shape and is recessed in the back side. The bearing retainer (40) fixed to the cover (34) by the mounting bolt (41) is fixed as shown in FIG. 12 by mounting the cover (34) to the body frame (1) by the cover bolt (38).

The recess (401) of the bearing retainer (40) covers the outside of the C-type retaining ring (39), and prevents the C-type retaining ring (39) from spreading and coming off. Further, the convex portion (402) of the bearing retainer (40) presses the non-rotating portion (351) of the idle bearing (46) to prevent rattling, and at the same time, the idle pin (32) is supported from the tip side. This prevents the idle pin (32) from being broken or bent by vibration or impact. Furthermore, since the gap with the rotating idle gear (502) is a gap of p, the grease inside the idle bearing (46) hardly flows out and stays inside and lubricates.
Furthermore, the distance σ is taken by the gap γ, and according to the results of the inventor, the gap p with the idle bearing (46) is set to 2 mm or less, and if the gap p is set to the distance σ or more, a lot of grease is contained inside the bearing. Can stay in. The distance of σ is 2 mm or more.
Narrowing or lengthening the dimensions below the inventor's track record resulted in increased material costs and precision machining, resulting in higher processing costs. By setting the gap p to 2 mm or less and the distance σ to 2 mm or more, assembly is easy and the processing cost is low.

The distance between the gear cover (34) and the non-rotating portion (301) of the idle bearing (46) is μ. The thickness of the bearing retainer (40) is a thickness obtained by adding λ to the interval μ. According to the results of the inventors, the optimum thickness λ is 1 mm or less. As a result, the gear cover (34) attached with the gear cover bolt (38) spreads outward by the thickness λ. The bearing retainer (40) presses the idle bearing (46) by the thickness λ to prevent rattling and keeps the idle pin (32) gripped at the tip, thereby contributing to less bending and longer life. .
Similarly, the gap between the bearing retainer (40) and the rotating part of the idle bearing (46) is set to the same distance between the base end of the idle pin (32) and the rotating part to a gap λ ′ (2 mm) or less. We propose a sharpening device characterized by a height of 2 mm or more.
This prevents the grease from flowing out from the base end portion and the tip end portion of the idle pin (32), and can be retained inside the idle bearing (46).
Moreover, if the gap is within this numerical value, metal processing is easy, it is an inexpensive standard standard material, and it is an exquisite distance that does not interfere during assembly. And in order to narrow the gap, the base end of the idle pin (32) is thickened, so the material change and the fixing force of the welded part are reduced, the welding area is expanded and the welded part is placed outside. I was able to supplement and strengthen it.

FIG. 13 is a cross-sectional view of the idle pin (32) using the bearing nut (60) star washer (61). The gap ω at the tip of the idle pin (32) has a gap of 5 mm or more. 32) As for the clearance between the base ends, ω ′ had a clearance of 8 mm or more, and the grease supplied from the grease nipple (33) immediately flowed out of the gap.
When the bearing (46) is seized, the bearing retainer (40) is worn and the mounting bolt (41) falls off, so that the abnormality inside the cover (34) can be judged from the outside.
If only the C-type retaining ring (39) is used, you will not know when it comes off due to an impact. Even if the bearing nut (60) is fixed with the star washer (61), it is not known when it is pulled out by vibration. In particular, there is often no even a periodic inspection to open the cover (34) after using for many years. As a result, the idle gear (502) sometimes burns the idle pin (32) and wears the idle pin (32).
Since grease is greased once a day, it can be understood that the idle pin (32) is deformed if the grease greasing part is deformed, but the bearing (46) and the idle gear (502) are deformed when grease is injected. Since it is not known, it may be used for a long time with deformation. If the mounting bolt (41) is loosened or cut off, it can be repaired at an early stage before a fatal trouble occurs.

As described above, the cutting depth of the constant thickness cutting device cannot be arbitrarily changed at the site, and the depth adjustment shim (30) is removed every time the cutting depth is changed. In addition, when turning with a hydraulic motor, the cutting force and turning force were temporarily attenuated due to interference with the cutting motor, and work could not be performed.
At the time of cutting the road surface on the bridge, it was V-shaped after cutting, causing a step in the waterproof sheet adhered parallel to the bridge length.
These problems have made it possible to change the cutting depth by simply tilting the main body frame by introducing the depth changing type adjustment shim (301). Because it was made to turn with an electric motor, the interference of hydraulic pressure died.
The road surface on the bridge can be cut in the bridge length direction by combining the method of turning by the depth-changing type adjustment shim (301) and the electric motor (40) and the method of cutting by moving the hydraulic excavator.

In the case of the constant thickness shaving device (8) according to the present invention configured as described above, the depth adjusting shim (301) according to the present invention covers just below the side plates ab (35, 36) of the main body frame (1). Since it comprised so that there may be no deformation | transformation of the repelling pressure direction (d ') of a liner part (7), and a welded part (37) is protected, generation | occurrence | production of a malfunction can be suppressed.
Since the bolt hole of the liner part (7) is a long hole (71), the bolt (12) can be removed even if the bolt hole (35) of the depth adjusting shim (301) is clogged with the powder of the object to be cut and the bolt cannot be pulled out. The depth adjustment shim (301) can be replaced with the attached. Moreover, even if the liner portion (7) is deformed in the direction of the counter-pressure (d ′), the bolt can be inserted and removed.

  By enabling grease to be applied to the idle pin (32) from the outside of the gear cover (34), grease can be directly supplied to the idle gear bearing (322), thereby extending the service life. The excessively lubricated grease protrudes from the idle gear bearing portion (322), and the dust in the bearing portion is taken in and discharged, so that further seizure can be prevented. Further, excess grease is accumulated in the gear cover (34), and new grease always adheres to the tooth surface of each gear to prevent wear and transmit a smooth driving force.

The bit (21) attached to the shaving drum (20) is pressed against the object to be shaved, moved in the direction of rotating upward from below, and the depth adjustment shim (301) is brought into contact with the shaving surface (90). By moving so as to be in contact, a part of the cutting force (p) works the same as the pressing pressure (d), and it is canceled by the depth adjustment shim (301) so as to prevent vibration, The vibration can be cut so that it does not jump off the cutting object and rotate freely, making it possible to reduce noise and create a clean shape.
The depth adjustment shim (301) prevents the liner portion (7) from being worn and deformed. By extending the width of the depth adjustment shim (301) to cover the force point x just below the main body frame (1), the liner part (7) does not bend and can withstand a large pressing force. . By making the mounting bolt hole of the liner part (7) into a long hole (72), the depth adjusting shim (301) can be attached and detached even if the bolt cannot be inserted or removed. In addition, the finished shape has been improved by cutting in the direction of upper rotation only.

Since the bearing retainer (40) presses the bearing (46) with an appropriate pressure of the fixing force of the cover (34) and the deflection force of the entire cover, it does not rattle.
Since the bearing presser (40) is pressed by the deflection force of the entire cover (34), the presser can be kept pressed for a long time without looseness and elasticity. If the gear cover bolt (38) comes loose, grease leaks from the periphery of the gear cover (34), so that it can be judged visually.
The base end of the idle pin (32) is fixed to the main body frame (1) by welding, and the distal end is pressed and fixed by the bearing retainer (40), so the idle pin (32) is held at both ends. As a result, it has a strong structure that is strong against vibration and shock and has a long service life.
When the idle pin (32) can be held by the bearing retainer (40), the strength of the welded portion (322) can be reduced. In the best case, the idle pin (32) can be fixed to the main body frame (1) with a bolt, and the manufacturing process can be greatly simplified. If repairs are made on site, welding will not be necessary, so it is only necessary to replace the parts, and the construction period will not be delayed.

The gap between the bearing retainer (40) and the bearing (46) can be reduced to 2 mm or less by attaching to the gear cover (34), and the grease supplied from the center of the idle pin (32) can be reduced to the bearing (46) as much as possible. Can be enclosed inside. The C-type retaining ring (39) and bearing nut (60) that are attached to the idle pin (32) use off-the-shelf products, so there is a gap of 9 mm or more and the gap cannot be set by design. Grease is constantly flowing and never stays.
However, if the bearing holder (40) is set so that the gap through which the grease flows out is 2 mm or less and the length of the gap is 2 mm or more, the grease is retained inside the bearing (46). Furthermore, even if there is a processing error or assembly error, if the bearing retainer (40) is set so that the gap is 2 mm or less and the gap length is 2 mm or more, it is an error within the JIS standard and cannot be assembled or rotated. There is no contact between the fixed part and the fixed part, and it can be commercialized even if the finishing process is not precisely defined, and it is inexpensive and safe.
If there is only a small gap and the distance is long, the grease stays in the idle bearing (46), and the old grease protrudes from the gap as it is lubricated with new grease. New grease is supplied and stays for a long period of time, extending the life of the bearing (46).

Further, if there is only a small gap and the distance is long, even grease that has started to melt due to heat generated by rotation of the idle bearing (46) can remain inside the idle bearing (46).
If the gap is reduced and grease is filled in the bearing (46) as much as possible and the bearing (46) is filled, moisture cannot reach the bearing (46), so that rust can be prevented. In addition, since the water generated upon condensation is difficult to enter through the gap, the grease is difficult to emulsify.
In addition, sand and metal debris are difficult to enter the bearing (46), and the failure rate of the bearing (46) is reduced, thereby extending the life.
Since the gap is small, even if there is a slight abnormality in the rotating part of the gear or the rotating part of the bearing (46), an abnormal noise is generated when contacting the bearing retainer (40). It can be immediately determined that an abnormality has occurred such as the bearing (46) being disconnected, the gear being disconnected, or the idle pin (32) being bent.

The C-type retaining ring (39) can be prevented from spreading and coming off due to an impact caused by vibration.
However, since the C-type retaining ring (39) only prevents the bearing (46) from falling off and does not act on the bearing (46), the bearing (46) may be worn and rattled.
The bearing (46) can be pressed by both the C-type retaining ring (39) and the bearing presser (40), and double fall prevention is achieved.
When the idle pin (32) is worn and deformed, or the welded part (322) is peeled and deformed, the mounting bolt (41) with the bearing retainer (40) attached to the gakaper (34) is loosened. Since it starts, it is possible to determine an abnormality in the cover (34) at an early stage.

Even if the bearing retainer (40) made a little thicker holds the bearing (46) by deformation of the cover (34) and is slightly worn and loose, it can be retained for a long time.
When the cover (34) expands (deforms) and there is no force to press the bearing retainer (40) against the bearing (46), or when the bearing (46) wears and becomes loose, the cover (34) By inserting a pressing thickness adjusting shim (41) between the bearing presser (40) and the bearing presser (40), the pressing force of the bearing presser (40) can be increased.
The bearing retainer (40) can hold the tip of the idle pin (32) by holding the non-rotating portion (351) of the bearing (46). The idle pin (32) is strengthened because it becomes a double-supported shaft by holding the welded portion (322) and the non-rotating portion (351) of the bearing (46) so as to be hardly bent.

DESCRIPTION OF SYMBOLS 1 Main body frame 2 Turning part 5 Sharpening hydraulic motor 7 Liner part 8 Constant thickness cutting apparatus 9 of the present invention Conventional constant thickness cutting apparatus 10 Bracket 12 Bolt (for depth adjustment shim)
20 (shaving) drum 21 bit 25 electric motor 26 gear box 30 (conventional) shaving depth adjustment shim 31 (conventional) gear cover 32 idle pin 33 grease nipple 34 gear cover 35 side plate a
36 Side plate b
37 Welded part 38 Cover cover bolt 39 C-type retaining ring 40 Bearing retainer 41 Mounting bolt 42 Swivel wheel 43 Rotary valve 45 Hydraulic port 46 Idle bearing 49 Pressing thickness adjustment shim 50 (hydraulic excavator) arm 52 (hydraulic excavator) cylinder 53 Link 55 crawler belt 60 bearing nut 61 star washer 71 long hole 81 gear side liner 90 object to be cut (cut surface)
91 Uncut residue 92 Cut mark 100 Sharpened portion, cutting band 201 Sharpening drum radius 301 Depth change type adjusting shim 311 of the present invention Cover 312 bolt of the present invention (for cover)
313 Grease hole Grease hole 319 Groove 321 Grease hole 322 Welding part 323 Idle gear bearing part 351 Non-rotating part (inside bearing)
401 Concave part 402 Convex part 501 Motor gear 502 Idle gear 503 Shaving gear a Travel direction b Arm operation direction c Swing direction d Pressing direction (pressing pressure)
d 'Counter pressure (counter pressure direction)
e Cutting direction e 'Counter-cutting direction f Cutting drum rotation direction g Inclination angle h Inclination angle k Bridge length direction x Position y Position z Position α Maximum cutting depth β Cutting width β' Width of the cutting part of constant-thickness machine (Gap between idle gear and C-type retaining ring)
p Gap (gap between the idle gear and bearing presser)
γ Clearance (Gap between idle gear and bearing presser)
σ Distance μ Thickness (Distance between idle gear and cover)
λ Thickness (thickness for generating pressing pressure)
ω Clearance (bearing nut and idle gear)

Claims (10)

A machine that attaches a main body frame to a hydraulic excavator arm so as to be swingable via a bracket, and presses a shaving drum attached to the main body frame against a concrete surface to perform concrete shaving work,
A concrete constant-thickness shaving apparatus comprising a depth adjusting shim that changes the shaving depth according to the inclination of the main body frame and is parallel to the direction of travel of the drum. A machine that attaches a main body frame to a hydraulic excavator arm so as to be swingable via a bracket, and presses a shaving drum attached to the main body frame against a concrete surface to perform concrete shaving work,
A concrete constant-thickness shaving apparatus comprising a turning portion that turns with an electric motor between the bracket and the main body. A machine that attaches a main body frame to a hydraulic excavator arm so as to be swingable via a bracket, and presses a shaving drum attached to the main body frame against a concrete surface to perform concrete shaving work,
A depth adjustment shim that changes the cutting depth according to the inclination of the main body frame is provided in parallel with the cutting drum traveling direction,
Using a concrete constant thickness shaving device characterized by comprising a turning part that turns with an electric motor between the bracket and the body,
A road surface cutting method characterized by cutting a concrete road surface by running a hydraulic excavator with the crawler belt and the cutting drum traveling in the same direction.   A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against the object to be shaved, and a depth to prevent the shaving drum from entering the object to be shaved deeper than set. An adjustment shim and a constant-thickness shaving apparatus in which the depth adjustment shim covers up to just below the main body frame.   A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against the object to be shaved, and a depth to prevent the shaving drum from entering the object to be shaved deeper than set. A liner part fixed to the main body frame for fixing the adjustment shim and the depth adjustment shim with a bolt, and a constant thickness cutting device in which the bolt hole of the liner part is a long hole in the cutting direction.   A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum attached to the main body frame and pressed against an object to be shaved, a hydraulic motor for driving the shaving drum, and a motor gear attached to the motor An idle gear for transmitting a force to a grinding drum gear attached to the grinding drum, an idle pin for pivoting the idle gear, and a grease supply for supplying grease supplied via the idle pin to the bearing portion of the idle gear A constant-thickness shaving apparatus comprising a hole and a gear cover that collects excess grease supplied from the greasing hole and covers the motor gear, the cutting drum gear, and the idle gear.   A main body frame attached to the tip of an arm of a hydraulic excavator, a shaving drum for pressing against a shaving object attached to the main body frame, and a depth for suppressing the shaving drum from entering a shaving object deeper than set. The height adjustment shim and the cutting drum are rotated upward from the bottom to the cutting direction, and the depth adjustment shim is pressed against the object to be cut and moved so that the cutting direction of the drum is an upper cut. How to sharpen.   A main body frame attached to the tip of an arm of a hydraulic excavator, a drum attached to the main body frame and pressed against an object to be cut, a hydraulic motor for driving the drum, and a motor gear attached to the hydraulic motor; A drum gear attached to the drum, an idle gear for transmitting the driving force of the motor gear to the drum gear, an idle pin for mounting the idle gear, a gear cover for covering the motor gear, the idle gear, and the drum gear, A shaving apparatus comprising: a bearing attached to an idle pin to support rotation of the idle gear; and a bearing press attached to the gear cover and pressed against the bearing attached to the idle pin.   The shaving apparatus according to claim 8, further comprising a C-type retaining ring attached to the idle pin so that the bearing does not fall off, and a bearing retainer that covers the C-shaped retaining ring so as not to spread.   The shaving apparatus according to claim 8, further comprising a bearing retainer made thicker than a gap between the gear cover and the idle bearing.