JPH05177430A - Belt driving device - Google Patents

Abstract

PURPOSE:To enhance the transmitting efficiency of driving torque to a belt, transmit a high torque with a small power to enhance the working speed of cutting or polishing, quietly perform the working in the sound suppressed state, improve the belt life of a saw tooth, and facilitate the unmanned control. CONSTITUTION:An endless belt-like saw tool 1 is laid over two pulleys 2, 3 and driven by rotation. As its driving device, driving motors 4, 5 are provided on both the pulleys 2, 3, respectively. They are belt driving devices for transmitting a high driving torque to the belt 1 as power vehicles. The circumferential surfaces of the pulleys 2, 3 making contact with the saw tooth 1 is subjected to the treatment for enhancing the frictional coefficient to prevent a slip, so that the power transmitting efficiency is enhanced. As the power vehicle, the device is formed by use of a low specific gravity material, and a high hardness material is adhered to the surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt driving device.

[0002]

2. Description of the Related Art Conventionally, a saw machine using an endless belt-shaped saw blade is constructed such that a saw blade belt is hung between a power train and a driven pulley and a motor is driven by a motor under a required tension. However, the belt driving torque is insufficient, the processing speed is reduced when cutting wood, metal, etc., and the driving force is applied while slipping between the belt and the power train, so the loss is large and the power of the driving source is large. There was a huge increase. Moreover, the frequency is 1.5 kHz to 1.8 k.
There is a drawback that uncomfortable sound is generated due to stick slip of about Hz. Further, the saw blade belt is worn by sliding friction with the motor vehicle, which causes heat generation, which significantly shortens the saw blade life and often breaks in a short time, which makes it difficult to operate unmanned. ..

[0003]

In view of the above-mentioned drawbacks of the prior art, the present invention improves the transmission efficiency of driving torque to the belt, transmits high torque with a small power to increase the processing speed for cutting, polishing, etc., and reduces noise. It is an object of the present invention to enable quiet processing in a state, improve the life of a belt such as a saw blade, and easily perform unmanned control and the like.

[0004]

In a belt drive device for driving an endless belt such as a power belt, a polishing cloth, a saw blade, etc. between pulleys to rotate the belt under tension, the plurality of pulleys are powered. A vehicle is provided with a drive device that applies a rotational drive force. Further, one or both of the endless belt and the motor vehicle are surface-treated to increase a friction coefficient. Further, it is characterized in that a low specific gravity material is used as the power vehicle, and a high hardness material is adhered to the surface.

[0005]

As described above, according to the present invention, a plurality of belt-carrying pulleys (usually two pulleys) are used as power vehicles to be cyclically driven by the drive unit, so that the transmission efficiency of the drive torque is increased and the drive torque is increased. It is possible to reduce the power of the motor and transmit extremely high torque to the belt. In addition, high torque is given by driving the belt with a plurality of power wheels, and moreover, one or both of the belt and the power wheel is surface-treated to increase the friction coefficient to further reduce slippage and increase the transmission efficiency and torque. Can be easily transmitted, wear heat generation due to slip friction can be prevented, and the belt life can be improved. In addition, the generation of unpleasant noise due to stick-slip between the belt and the power train is eliminated, and quiet cutting and polishing can be performed. In addition, the rotational drive torque is reduced by configuring the motor vehicle with a low specific gravity material,
Responsiveness such as starting and stopping is also improved, eccentricity is reduced, and stable belt driving can be performed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment of the drawings. FIG. 1 shows an embodiment applied to a saw machine. Reference numeral 1 denotes an endless belt-shaped saw blade, which is hung on two pulleys 2 and 3 to be driven to rotate and cut wood and metal materials. Both pulleys 2 and 3 are provided with drive motors 4 and 5, respectively, so that drive torque can be transmitted to the belt 1 as a power vehicle. 6
Is a periodic power supply circuit using PWM control or the like, and supplies the corresponding periodic drive energy to the motors 4 and 5 by a signal from a condition setting circuit 7 that sets the power and the like corresponding to the material and size of the cutting material. To do. Reference numeral 8 is a hydraulic cylinder that controls the tension of the belt 1, and the piston rod controls the movement of the pulley 2 to adjust the gap between the pulley 2 and another pulley 3. Although not shown, a control device for the cylinder 8 is controlled by a valve of the hydraulic circuit or the like in response to a signal from the condition setting circuit 7.

In the above, when both the motors 4 and 5 are cyclically driven under the condition that the required tension is applied by the control of the cylinder 8, the pulleys 2 and 3 act as a power wheel to give the saw blade 1 a rotational driving force from both. This transmission drive torque can be remarkably increased as compared with the case of using the conventional single power vehicle, and the power of the drive source can be reduced because there is no power loss such as slip. For example, radius 1.05
When the wood is cut with a saw machine in which a saw blade having a blade pitch of 25 mm is hung between pulleys set to have a pulley of m of 2.3 m, a cutting depth of 0.3 mm and a cutting speed of 7 m /
When cutting a log of 2 m in min, the driving power of both pulleys is about 800 W on one side, and the total power is 1.6.
kW was sufficient. This means that the energy efficiency can be reduced to about 4 to 1/5 in comparison with the case where about 7.6 kW was required when driven by the conventional single-powered vehicle. In the above structure, the rotation of one motor can be distributed to the two pulleys 2 and 3 to act, and various types of motors can be used as a rotating device.
Further, a constituent device such as a screw can be used for tension control.

FIG. 2 is a perspective view of an embodiment of a power vehicle. In FIG. 2 (a), 9 is the vehicle body and 10 is an ear formed at one end of the vehicle to prevent the belt from falling off. On the circumferential side surface of the vehicle body 9, a surface treatment layer 9a for increasing the friction coefficient is applied in a belt shape in a direction parallel to the axis. In this surface treatment, unevenness is formed by, for example, dull processing of laser pulse irradiation, and thermal hardening is performed by rapid heating and quenching, thereby increasing the friction coefficient and improving wear resistance. In addition, the dull processing can be arbitrarily used such as plasma irradiation, shot peening and the like. In addition, it is possible to form the uneven surface by the coating treatment of the wear resistant material, improve the wear resistance, and increase the service life. For example, a welding process (MW method) can be used for the coating process of the wear resistant material. TiB ₂ , WC, TiC, B ₄ C, SiC, Al ₂
O _3, Z _r O _2, etc. alone or mixed carbide material, further Dia, the material added CBN or the like as an electrode, rotating sliding, the movement of the vibrating contact such line between which the base material The electrode material is welded and coated on the base material by pulse discharge while being applied. Since a small amount of electrode material is deposited on the base material surface for each discharge by pulse discharge, an uneven surface is easily formed, and a cemented carbide layer diffusion-welded to the base material is formed to form a wear resistant surface. be able to. Further, it is possible to supply powder of cemented carbide to this method and perform welding by discharge or laser. Furthermore, the coating process is welding, PVD, C
VD or the like can be used. Further, the hard particles can be bonded by using resin or metal as a binder.

FIG. 2 (b) shows ears 10 provided at both ends of the car body 9 to prevent the belt from falling off, and a surface treatment for increasing the friction coefficient is applied to the circumferential side surface of the car body 9 in a belt shape on the shaft. The treatment layer 9b is formed by inclining at a certain angle to form an inclining strip-shaped processing layer 9b. For this surface treatment, the method described in the above embodiment can be similarly used. Further, FIG. 7C shows an embodiment in which the surface treatment layer 9C is formed on the entire circumferential side surface of the car body 9. By such surface treatment, the frictional force at the contact surface with the belt is increased, the efficiency of motion transmission from the motor vehicle to the belt is improved, and rotation without slip can be given to significantly improve the driving torque. The friction coefficient increasing process may be a groove-like process such as a mechanical process or a laser process.

Usually, the FC material pulley has a friction coefficient of 0.1.
It is about 0.2, but the surface treatment is applied to make unevenness 5
When formed to about μm, the coefficient of friction is 0.25 to 0.3
Can be increased to a degree. However, when the unevenness is 100 μm or more, the friction coefficient increases,
This is not preferable because the fatigue of the belt such as a saw blade tends to increase.

[0011] = Pressure kg, υ = speed is given by m / S, so the tension of the belt that is now stretched between the two pulleys is 1000 kg.
Then, the pressure p acting on the semi-circumferential portion of one pulley that comes into contact with the belt is p = 500 kg. Also, friction coefficient μ =
When 0.1 and the moving speed of the belt υ = 44.5 m / S, HP = 29 horsepower is obtained from the above formula, and when the belt speed υ = 31 m / S, HP = 20.6 horsepower. Here, since the tension of the belt cannot be increased more than a predetermined value depending on the material, etc., in order to increase the transmission horsepower, it is necessary to increase the friction coefficient μ, and conventionally, it is usually 0.1 to 0.1%.
The surface treatment of about 0.2 gives μ = 0.3 to 0.
The transmission torque is increased from 1.5 to
It can be increased about 2.5 times. Further, in the present invention, the torque is further doubled as a result of applying the rotational driving force to the pulleys on both sides to drive the vehicle as a power vehicle, and when the total is added, the transmission torque is about 3 to 5 times that of the conventional one. It can be increased to

In the surface treatment, MW (Micro
When the base material is subjected to a coating process using the -welding method, the coating layer can be highly accurately dulled with a thickness of about 10 to 20 μm, and can be cured and amorphized. For example, _TiB 2 in FC _material, B 4 _C, the friction coefficient and to cover the wear material such as M o _{M n} becomes approximately 0.35 to 0.6,
At the same time, the wear resistance is increased, and the life of the pulley can be extended more than twice. In addition, due to the increase in the friction coefficient, it is possible to prevent the drive belt such as a saw blade from stick-slip of about 1 to 2 KHZ, wear of the belt is prevented, the service life is increased, and there is no unpleasant vibration noise. to enable. For example, when Al mixed with 40 vol% of SiC at 26 Vol% was adhered to the surface of the motor vehicle to a thickness of about 15 μ, the actual load could be about 55 HP and the life of the saw blade could be increased. In this case, the actual friction coefficient μ was about 0.44, and the surface pressure was substantially constant at about 1.6 N or more.

Further, in the case of a metal belt such as a saw blade, the belt surface can be treated to increase the friction coefficient, and the transmission efficiency of the driving force can be increased. The belt is not limited to a saw blade, but can be any belt such as a polishing belt, a power transmission belt, etc., but any of them can easily transmit high torque, and can perform processing such as cutting and polishing with high efficiency. be able to. Further, since there is no slippage between the belt and the motor vehicle, the response speed is high, and the start, stop, speed control, etc. can be responded at high speed, and the power transmission belt etc. can be precisely controlled. In addition, light motors such as Al alloys, resins, powders, fiber reinforced composite materials, and other low specific gravity materials are used for power vehicles to make them lightweight and sufficiently used by surface treatment to adhere friction-resistant materials to friction surfaces. Can withstand. According to this, the rotational torque is reduced, the response such as starting and stopping is improved, and stable belt driving with less eccentricity and the like becomes possible.

[0014]

As described above, according to the present invention, a plurality of belted pulleys are used as a motor vehicle to be cyclically driven by a drive device, so that the transmission efficiency of drive torque is increased and energy is not increased. Since the torque can be transmitted, the power of the drive motor can be reduced and highly efficient high torque drive can be performed. Also, high torque is given by driving the belt with multiple power vehicles,
Moreover, by applying surface treatment to increase the coefficient of friction on one or both of the belt and the motor vehicle, slip can be further reduced, transmission efficiency can be improved, and high power transmission can be achieved.
Since high torque transmission drive can be facilitated, cutting, polishing, and other processing can be performed at high speed, wear due to slip friction can be prevented, and heat generation can be prevented, thereby extending the belt life. Further, the response speed is high, and extremely precise drive control can be performed as a power transmission belt. In addition, the generation of unpleasant noise due to stick-slip between the belt and the power train is eliminated, and it is possible to efficiently perform processing such as quiet cutting and polishing. In addition, by using a low specific gravity material for the power vehicle, it is possible to reduce the drive torque and reduce the response with a light weight, and by adhering a friction resistant material to the friction surface, it can be used sufficiently to increase the friction coefficient and increase the torque. Can communicate.

[Brief description of drawings]

FIG. 1 is an example of the present invention.

FIG. 2 is a partial structural diagram of another embodiment of the present invention.

[Explanation of symbols]

 1 Saw Blade 2, 3 Pulley 4,5 Motor 6 Periodic Power Supply Circuit 7 Condition Setting Circuit 8 Hydraulic Cylinder 9 Pulley 10 Ears 9a, 9b, 9c Surface Treatment Layer

Claims (3)

[Claims] 1. A belt driving device for rotatably driving an endless belt such as a power belt, a polishing cloth, a saw blade, etc. between pulleys in a state in which tension is applied to the pulleys. A belt drive device including a drive device that applies force 2. The belt driving device according to claim 1, wherein one or both of the endless belt and the motor vehicle are surface-treated to increase a friction coefficient. 3. The belt drive device according to claim 1, wherein the motor vehicle is made of a low specific gravity material, and a high hardness material is adhered to the surface thereof.