JP3840602B2 - Torque limiter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a torque limiter configured to transmit rotational power between a rotating shaft and a rotating body, and to stop transmission when torque at the time of transmission exceeds a predetermined value.
[0002]
[Prior art]
In the rotation power transmission path in industrial machinery, etc., when the torque during power transmission exceeds the set value, a torque limiter is often installed to automatically stop the transmission for damage prevention and safety. . There are various types of torque limiters known in the art, but the limit torque value setting is adjusted with a torque adjusting screw or the like provided on the rotating part of the torque limiter. It was necessary to stop the operation of the mechanical device, and it was necessary to repeat the operation and stop for confirming and adjusting the adjustment amount. In addition, although the transmission could be stopped due to the increased torque value, the transmission could not be stopped voluntarily from the outside by the operator's will, so a separate clutch was installed to turn the transmission on and off. It was necessary to keep.
[0003]
[Problems to be solved by the invention]
Many torque limiters are transmitted using frictional force, etc., but when attached to a mechanical device installed outdoors, the transmission torque changes due to the influence of temperature, humidity, etc., so the transmission torque is frequently adjusted. Need to do. On the other hand, since the machinery is usually covered with a cover or the like to prevent danger, when performing the above transmission torque adjustment, the cover or the like must be removed each time. The work was complicated. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to easily and easily adjust the transmission torque from a place away from the power transmission unit due to frictional force, and to easily stop the transmission if necessary. .
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. That is, the torque limiter according to the present invention includes a rotating shaft that is rotatably provided in a mechanical device, a cylindrical transmission member that is fixed to the rotating shaft so as not to be rotatable relative to each other, and an outer shaft that is independently rotatable on the transmitting member. A fitted rotating body, friction plates provided on both sides of the rotating body, a pressing plate that is attached to the transmission member so as to be axially movable and relatively non-rotatable, and presses the friction plate against the rotating body, and the pressing plate A spring that presses the outer surface of the spring toward the friction plate, a spring pressure adjusting screw that can adjust the pressing force of the spring by adjusting the position of the spring with respect to the presser plate, and a handle attached to the frame of the machine comprising an adjustment means for separately frictional force between the spring pressure adjusting screw the holding plate by the rotation operation can be moved in the direction of increase or decrease, and the cutting off transmission by operation of said adjusting means It is characterized in that possible is.
[0005]
The torque limiter according to the present invention transmits rotational power from the driving side to the driven side by the frictional force of the friction plate, and presses the spring energizing the frictional force of the friction plate in the opposite direction from a remote location. The transmission torque can be adjusted by reducing the frictional force, and the transmission itself can be stopped by increasing the reduction amount.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described. FIG. 1 and FIG. 5 show specific examples of the present invention, and this torque limiter 1 is for transmitting rotational power from a sprocket 2 which is a rotating body to a rotating shaft 3. The rotary shaft 3 is rotatably supported by bearings 4 and 5, and a cylindrical transmission member 7 is fitted in an intermediate portion thereof.
[0007]
The transmission member 7 has a male screw 7a cut on one end side of a cylindrical body, and a flange 7b and a boss 7c are integrally provided on the opposite end. A screw hole for a set bolt is provided in the boss 7c, and a set bolt 8 for fixing to the rotating shaft 3 is screwed into the screw hole. On the other hand, a key 10 for restraining mutual rotation is provided between the transmission member 7 and the rotary shaft 3, and axial movement is restricted at the end of the transmission member 7 opposite to the boss 7 c. A split pin 11 is provided.
[0008]
A sprocket 2 is rotatably attached to the outer peripheral portion of the transmission member 7 via a bush 15. A friction plate 16 is interposed between one surface of the sprocket 2 and the flange 7 b of the transmission member 7. On the opposite side of the sprocket 2, a disc-shaped presser plate 20 having a recess 20 a and a mounting hole 20 b located at the center of the recess is fitted into the transmission member 7, and the presser plate A friction plate 17 is also interposed between 20 and the sprocket 2. As shown in FIG. 2, the presser plate 20 is slidably fitted in the axial direction to the body portion of the transmission member 7 provided with the parallel notches k, k, so that it can move in the axial direction. However, relative rotation is impossible.
[0009]
A trumpet-shaped disc spring 22 that opens downward in FIGS. 1 and 5 is provided in the recess 20 a of the presser plate 20. The disc spring 22 is also provided with a mounting hole 22a at the center, and is fitted into the transmission member 7. A spring pressure adjusting screw 25 is provided above the disc spring 22 in FIGS. 1 and 5, and a centering plate 26 is interposed between the spring pressure adjusting screw 25 and the disc spring 22. The spring pressure adjusting screw 25 is provided with a plurality of adjusting screws 27,... At appropriate positions along the outer peripheral portion thereof.
[0010]
One bearing 4 is attached to a mounting bracket 32 fixed to a frame 30 of the mechanical device. On both sides of the mounting bracket 32, sandwiching members 33 and 33 having groove-like spacing portions 33a are integrally projected. A pair of guide plates 36, 36 of a U-shaped transmission frame 35 in a plan view is slidably fitted in the groove-like interval portions 33a, 33a of the holding members 33, 33 on both sides. Therefore, the transmission frame 35 can be moved back and forth along the groove-like interval portions of the clamping members 33 and 33. Shafts 37, 37 projecting sideways are provided at a pair of left and right ends of the transmission frame 35, and bearings 38, 38 are attached to the shafts. These bearings 38 and 38 are adapted to rotate in contact with the plate surface of the pressing plate 20. In addition, these bearings are for enabling the transmission frame 35 to be pressed so as not to hinder the rotation of the presser plate 20, and may have other shapes.
[0011]
A bush 40 is fitted into a mounting hole 35a provided in the center of the base of the transmission frame 35, and a handle shaft 42 is inserted through the bush. A male screw portion 42 a is provided at the distal end portion of the handle shaft 42, and the male screw portion 42 a is screwed into a screw hole 32 a provided in the mounting bracket 32. A handle 45 is attached to the handle shaft 42. 46 is a key, and 47 is a bolt for fixing the handle. The handle 45 serves as a transmission force reducing means for reducing the frictional force of the friction plate from a remote location. By rotating the handle 45 forward and backward, the transmission frame 35 moves back and forth (up and down in FIG. 1). Then, the presser plate 20 is pushed upward in the figure against the pressure of the disc spring 22 when moving forward, and the friction plate can be pressed by the presser plate 20 when moving backward.
[0012]
The sprocket 2 is connected to the drive-side sprocket by a chain C, and rotational power is transmitted from the drive-side sprocket. Since the sprocket 2 is fitted to the rotary shaft 3 so as to be freely rotatable, this rotational force is not directly transmitted to the rotary shaft 3, but friction plates 16 and 17 are provided on both surfaces of the sprocket 2. Therefore, it is transmitted to the rotating shaft through these friction plates. That is, one friction plate 16 is in contact with the sprocket surface and the transmission member 7, and the other friction plate 17 is in contact with the opposite surface of the sprocket 2 and the presser plate 20. Since the presser plate 20 is pressed against the friction plate 17 by the disc spring 22, the friction plates 16 and 17 are pressed and integrated by the presser plate 20 and the sprocket 2, and the sprocket 2 and the flange of the transmission member 7, respectively. ing. Therefore, the rotational power is transmitted from the sprocket 2 to the transmission member 7 through the frictional force of the friction plates 16 and 17, and is transmitted from the transmission member 7 to the rotary shaft 3. The rotation of the rotating shaft 3 is taken out from a transmission gear G attached to the rotating shaft and transmitted to the mechanical device to drive the mechanical device.
[0013]
The magnitude of the friction force by the friction plates 16 and 17 can be adjusted by a spring pressure adjusting screw 25 that presses the disc spring 22. Further, when the disc spring 22 is inclined, the centering can be performed by appropriately turning the adjusting screws 27. During transmission, if a torque greater than the transmission force due to the friction force set by the adjusting screw 25 is applied, slip occurs between the friction plates 16 and 17 and the presser plate 20, the sprocket 2 and the flange of the transmission member 7. As a result, transmission of rotational power from the sprocket 2 to the rotary shaft 3 is not performed. For this reason, an excessive load is not applied to the mechanical device or the like, and the mechanical device is prevented from being damaged.
[0014]
Next, the torque limiter 1 can also adjust the pressing force of the disc spring 22 by turning the handle 45. Since the screw portion 42a of the handle shaft 42 of the handle 45 is screwed into the screw hole 32a of the mounting bracket 32, when the handle 45 is turned, the transmission frame 35 attached to the handle shaft rotates. Move back and forth depending on direction. When the handle 45 is rotated in the forward rotation direction, the bearing 38 at the tip of the transmission frame 35 presses the presser plate 20 against the disc spring 22, so that the friction plates 16, 17 and the sprocket 2, the presser plate 20, the flange As a result of the decrease in the adhesive force with 7b, the frictional force is reduced, and slipping easily occurs with a small torque. When the handle 45 is further rotated in the forward direction, the pressing force of the disc spring 22 applied to the friction plate decreases, and finally the pressing force of the disc spring 22 does not act on the friction plate, so that the sprocket 2 and the rotating shaft 3 The transmission between is cut off. Therefore, the same effect as when the clutch for power transmission is disengaged by operating the handle 45 can be realized. If the handle 45 is turned in the opposite direction, the force resisting the pressing force of the disc spring 22 is reduced, so that the frictional force is increased.
[0015]
6 and 7 show a debris remover (dust remover) in a water channel incorporating the torque limiter 1. This dust collector 50 is for removing empty cans, dust, and the like flowing through the water channel so that no dust etc. is left at the pump-up water intake on the downstream side, and between the side walls 51 and 52 of the water channel F. A transmission wheel M provided with a torque limiter 1 is installed between the water wheel 55 provided on the upper side and a net conveyor 60 provided on the upstream side of the water wheel. A sprocket 54 is attached to the rotating shaft 53 of the water turbine 55, and the sprocket and the sprocket 2 of the torque limiter 1 are connected by a chain C.
[0016]
The net conveyor 60, which is the main body of the dust removal apparatus, is provided with a net 64 that circulates between a driving roller 62 and a driven roller 63 provided at the upper and lower ends of frames 61, 61. It is installed diagonally from the top of the embankment. On the net 64, dust scraping plates 67,... Are provided at appropriate intervals, and a rotating brush 66 for scraping off dust on the net surface is provided below the net conveyor.
[0017]
A sprocket 69 is attached to the shaft 68 of the drive roller 62, and this sprocket is connected to a sprocket 72 provided on the output shaft 71 of the electric motor 70 by a chain C ′. The motor 70 is a gear motor with a clutch that can rotate in the forward and reverse directions, and a gear G ′ that meshes with the transmission gear G of the torque limiter 1 is attached to the shaft 71. Note that another sprocket 74 is attached to the shaft 68 of the drive roller 62 and is connected to the sprocket 76 of the rotating brush 66 by a chain C ″.
[0018]
The transmission M provided with the torque limiter 1 is installed on the dike of the water channel F. The entire transmission is covered with a protective cover 78, but the handle 45 is provided so as to protrude from the cover to the outside and can be operated from the outside. A floor board 80 on which the scraped scraps are placed is provided under the upper end of the net conveyor 60 so as to cover the water channel. Symbols 82 and 83 in the figure are cover plates for covering the gap.
[0019]
The dust removing machine 50 is driven mainly by the rotational power of the water wheel 55 rotating by the water flow flowing in the direction of the arrow X in the figure, and a gear motor 70 is provided as an auxiliary power source. The gear motor 70 also supplies power for circulating the conveyor 60 of the dust removal device in the reverse direction. The rotational power of the water wheel 55 is supplied to the sprocket 2 of the torque limiter 1 by the chain C, and rotates the rotary shaft 3 through the frictional force of the friction plates 16 and 17. This rotational force is transmitted from the transmission gear G to the gear G ′, the direction of rotation is reversed, and is transmitted to the sprocket 69 of the driving roller 62 via the sprocket 72 and the chain C ′ to rotate the driving roller 62. As a result, the net conveyor circulates and moves in the direction of arrow Y in the figure, so that empty cans and garbage flowing from the upstream are scraped up by the net conveyor and discharged from the upper end portion onto the floor board. The dust attached to the net is scraped off by the rotating brush 66.
[0020]
On the other hand, when large garbage such as driftwood flows, the load is too large when it is caught on the net conveyor 60, and an excessive force is applied to the rotational motion part, which may be damaged. The limiter 1 is attached, and when a load exceeding a certain level is applied, slippage occurs in the transmission portion by the friction plate and the transmission stops, so that damage to the machine can be avoided. The limit torque value causing the slip can be adjusted by the adjusting screw 25, but can also be adjusted from the outside by the handle 45. Therefore, even when the frictional force changes due to the influence of humidity or the like, it can be easily corrected.
[0021]
Also, during the work to remove the large garbage that caused the stop from the stopped dust collector, the torque limiter suddenly returns and the machine starts to move, which is extremely dangerous, but this device is installed outside the cover. By rotating the handle 45, the presser plate 20 and the disc spring 22 are pressed, and the sprocket 2 can be idled to stop the transmission of power from the water turbine so that the clutch can be disengaged. It can be performed.
[0022]
Furthermore, when long garbage such as a rope or string flows, it is entangled with the net conveyor 60 and cannot be separated, so that it is necessary to reversely remove the net conveyor. In this case, the gear motor 70 with the clutch is rotated in the reverse direction. However, the gear motor 70 with the clutch cannot be rotated in the transmission connection with the water wheel 55 unless the motor has a large capacity. However, since the torque limiter 1 is provided in this device, the conveyor can be easily reversed by turning off the power from the turbine by operating the handle 45 for the clutch function.
[0023]
【The invention's effect】
As is clear from the above description, the torque limiter according to the present invention is designed so that the friction plate slips and cuts off the transmission when the load exceeds the set value. When a strong force is applied, the machine automatically stops, and it is possible to prevent a mechanical device from being damaged. The limit load at which the slip occurs can be adjusted by an adjusting screw attached to a spring that presses the friction plate. However, in addition to the adjusting screw, it can be adjusted by an external adjusting means. The limit load can be easily and easily adjusted according to temperature, humidity, and the like. Furthermore, since this adjustment means can also be used to disengage the clutch that cuts off the transmission, it is possible to avoid the danger of suddenly resuming the rotation once stopped during the repair of a mechanical device or the like to which this is attached. It was.
[Brief description of the drawings]
FIG. 1 is a plan view of a torque limiter of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA.
FIG. 3 is a sectional view taken along line BB.
FIG. 4 is a sectional view taken along the line CC.
FIG. 5 is an explanatory diagram of a transmission state.
FIG. 6 is a plan view of a water channel dust removal machine.
FIG. 7 is a front view thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Torque limiter 2 Sprocket 3 Rotating shaft 7 Transmission member 15 Bushing 16 and 17 Friction plate 20 Presser plate 22 Disc spring 25 Adjustment screw 32 Mounting bracket 35 Transmission frame 38 Bearing 45 Handle 50 Dust removal machine 55 Water wheel 60 Net conveyor 66 Rotating brush 70 Gear motor

Claims (1)

A rotating shaft provided rotatably in a mechanical device, a cylindrical transmission member fixed to the rotating shaft so as not to mutually rotate, a rotating body externally fitted to the transmitting member so as to be independently rotatable, and the rotating body A friction plate provided on both sides of the belt, a press plate that is attached to the transmission member in an axially movable and non-rotatable manner and presses the friction plate against the rotating body, and a spring that presses the outer surface of the press plate toward the friction plate When the spring pressure of the pressing plate by the rotation operation of the handle attached to the frame of the spring pressure adjusting screw capable of adjusting the pressing force of the spring, machine by adjusting the position of the spring relative to the presser plate characterized in that the adjustment screw can be separately frictional force comprises an adjustment means which can be moved in the direction of increase or decrease, and interrupt the transmission by the operation of said adjusting means torque limit Over.

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