JPH0730739Y2 - Load drive transmission with screw brake - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drive system for vertically moving a spindle supporting a load such as a floodgate or a gate valve in order to open or close a floodgate or a gate valve. The present invention relates to a load drive transmission device with a screw brake that incorporates an electric reduction mechanism.

[Conventional technology]

2. Description of the Related Art Conventionally, as a facility for operating a heavy load such as a large floodgate and a gate valve, there is an apparatus that combines a worm and a worm wheel, or an electric speed reducer that is generally called that combines various gears. For example, as shown in FIG.
Disclosed is a valve control device 10 incorporating an operation transmission device for vertically moving a spindle 2 supporting a valve 3 in order to open and close a water channel by moving a valve 3 such as a gate valve and a water gate installed in a river or a canal up and down. Has been done. The valve control device 10 includes, for example, a support 8 for guiding the vertical movement of a pair of spindles 2 on a slab 6 built as a foundation on a bank 7 such as a river or a canal, and a speed reducer 9 in the support 8. It consists of a built-in operation transmission.
Further, the slab 6 is provided with a field operation panel 5 for operating and controlling the valve control device 10. This valve control device 10 has a valve control case
A manual handle 1 is arranged on the outside of 8A. In the figure, 4 is a valve opening meter case, and 7A is a switch case.

Some conventional manual sluice gate transmissions use a transmission mechanism including a worm and a worm wheel to move a spindle having a sluice up and down. The transmission mechanism usually has a self-locking mechanism built into the worm itself.

Further, as for equipment for operating a light load such as a floodgate and a gate valve, there is a load operation transmission device as disclosed in Japanese Patent Application No. 63-160409 relating to the present applicant.

Alternatively, some conventional manual sluice gate transmissions use a transmission mechanism including a pin and a rack to move the sluice up and down. The transmission mechanism is provided with a speed adjusting device for adjusting the descending speed of the sluice or load when the sluice is descending, and with a clutch for preventing rotation of the handle.

[Problems to be solved by the device]

However, the transmission mechanism composed of the worm and the worm wheel has a problem that the efficiency of the screw becomes extremely inferior to the rotation of the handle, and becomes extremely disadvantageous when, for example, the sluice gate must be closed promptly to increase water. Have a point.

Further, the transmission mechanism including the pin and the rack requires a mechanism such as a speed adjusting device, a clutch, and a switching lever, and the transmission mechanism itself is complicated, and the operation is also complicated.
Similar to the above, it was disadvantageous to close the lock in an emergency.

Therefore, regarding a spindle drive device used for opening and closing operations of valves, sluices, etc., that is, up and down operation, especially in an emergency,
In order to immediately lower the valves, sluices, etc. manually and to immediately close the waterways, etc. with a simple operation, the applicant of the above-mentioned Japanese Patent Application No. 63-160409 discloses that the load of sluices, gate valves, etc. is light. Disclosed a load drive transmission.

However, when the load of the floodgate, the gate valve, etc. is heavy, the load drive transmission increases the load of the floodgate, the gate valve, etc. unless the load drive transmission incorporating the electric speed reduction mechanism is used in normal operation. Is difficult to do. As a solution to this, for example, it is possible to increase the reduction ratio, but due to the high reduction ratio, the number of times of rotation operation of the manual handle for raising the sluice is increased, and
It will take a long time to climb. On the contrary, when the sluice gate is descending, since the reduction ratio is high, the force from the load side is transmitted through the gearbox, and each component incorporated in the load operation transmission device is rotated at high speed.

Therefore, the load drive transmission according to the present invention has been focused on incorporating an electric reduction mechanism through an electromagnetic clutch into the load drive transmission disclosed in Japanese Patent Application No. 63-160409, as shown in FIG. It is a thing.

However, even if the load drive transmission device is simply incorporated in the electric speed reduction mechanism, it is not possible to perform good operation. That is, in order to stop the load such as the floodgate at a predetermined position by operating the electric motor, the electromagnetic clutch attached to the electric motor is turned off, and at the same time, the electromagnetic clutch of the drive system of the screw brake is turned on by the load operation transmission device. Then, the rotary shaft 25 with a male screw incorporated in the load operation transmission device rotates in a direction in which a load such as a floodgate acts. This rotating force slides the nut 28 incorporated in the male screw part in a threaded state, and as a result, pressurizes the friction discs 31, 35 via the ratchet wheels 32, 36, but the braking force is In order to work, the nut 28 must slide on the male screw rotating shaft 25.

That is, when comparing the sliding resistance of the screw portion between the rotating shaft 25 with a male screw and the nut 28 with the rotating resistance of the manual rotating shaft 13, if the sliding resistance of the screw portion is not smaller, the nut 28 will not slide. Without it will rotate. When the nut 28 rotates, the braking force does not work and the load of the floodgate or the like falls due to the gravity. In other words, the manual rotary shaft 13
The sliding of the threads must be lighter than the rotation of. The load drive transmission in Japanese Utility Model Application No. 63-160409 is manually operated, and the operator is always in contact with the manual handle when operating the device. Although the above phenomenon does not occur because it is relatively light, the above phenomenon occurs when an electric speed reduction mechanism is incorporated. Factors that cause the sliding efficiency of the thread to be poor include variations in the machining accuracy of the thread and
Lubrication oil is lowered due to a change in longitude, or galling or the like generated in the screw portion is increased. The use of a ball screw can be considered as a measure for solving the above-mentioned problems, but it cannot be used because it is expensive.

The purpose of this device is to solve the above problems,
A spindle of a spindle drive device used for opening and closing operations of loads such as valves and sluices, that is, up and down operations is configured in a rack, and a pinion is used for raising and lowering the rack by a reduction gear, an electric motor, a plurality of electromagnetic clutches, a switching means, screws With a drive system equipped with a transmission mechanism such as a brake, the load drive system can be easily switched to electric or manual by simply switching the electromagnetic clutch, and when the spindle descends, the electromagnetic clutch is released. Alternatively, the load such as the floodgate can be immediately and reliably lowered by its own weight by simply and manually releasing the brake in some cases, and further, a constant load is applied to the rotation of the manual rotating shaft in the screw brake. By setting the sliding resistance of the thread part of the screw brake to be larger than the rotation resistance of the manual rotary shaft, (EN) A load drive transmission device with a screw brake, which can operate a rake reliably and quickly, prevents a load from dropping due to its own weight, and incorporates an electric speed reduction mechanism that is extremely safe. .

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, the invention is directed to a speed reducer incorporated in a drive system for driving a load such as a floodgate, an electric motor connected to an input shaft of the speed reducer via a first electromagnetic clutch, and a second electromagnetic clutch connected to the input shaft. Connected screw brake, switching means for switching ON / OFF states of the first electromagnetic clutch and the second electromagnetic clutch, a manual rotating shaft connected to the screw brake, and a mechanical load provided for the manual rotating shaft. The present invention relates to a load drive transmission device with a screw brake, the device and a manual handle attached to the manual rotation shaft.

Further, in the load drive transmission device with a screw brake according to the present invention, the screw brake includes a nut provided with a gear that meshes with the manual rotation shaft, a rotation shaft with a male screw that meshes with the nut, and the male screw arranged on both sides of the nut. Disk bosses that rotate integrally with a rotating shaft, ratchet wheels that are respectively arranged between the nut and the disk boss via friction disks on the respective disk bosses, and the ratchet wheel that is locked to one of the ratchet wheels And a ratchet for normal rotation for restricting rotation in the forward direction, and a ratchet for reverse rotation for locking the ratchet wheel on the other side to restrict rotation of the ratchet wheel in the reverse direction.

[Action]

The load drive transmission with a screw brake according to this invention is
It is configured as described above and operates as follows. That is, in this load driving transmission device, an input shaft of a speed reducer incorporated in a drive system for driving a load such as a water gate is connected to an electric motor via a first electromagnetic clutch, and the input shaft is connected to a screw via a second electromagnetic clutch. A switching device is provided for connecting the brake and the manual rotation shaft to switch between the on / off states of the first electromagnetic clutch and the second electromagnetic clutch, and a mechanical load device for the manual rotation shaft connected to the screw brake. Since the above is provided, the drive system for raising and lowering the load such as the water gate can be easily switched to either automatic operation by the electric motor or manual operation only by switching the first electromagnetic clutch or the second electromagnetic clutch. Further, when the load is urgently lowered, the electromagnetic clutch is simply released, or the screw brake is automatically and, in some cases, manually released, so that the load is quickly and reliably applied to the high speed by its own weight. In addition, a constant load is applied to the rotation of the manual rotary shaft in the screw brake, and the sliding resistance of the screw part of the screw brake is set to be larger than the rotation resistance of the manual rotary shaft. The brake can be operated reliably and quickly, the phenomenon in which the load drops due to its own weight is prevented, and the safety is extremely high. Therefore, compared with the conventional worm and the worm wheel, the load can be lowered more rapidly than the load lowering speed. For example, the floodgate can be shut off urgently. Moreover, since the load is applied to the rotation of the manual rotation shaft, the sliding resistance of the screw portion can be made relatively smaller than the rotation resistance of the manual rotation shaft, and the nut of the screw brake can be rotated. The brake can be activated by sliding without causing the load to be stopped, and thus the load can be stopped at a predetermined position.

Further, since the screw brake is constituted by each of the friction brakes including a nut provided with a gear meshing with the manual rotation shaft, a rotation shaft with a male screw meshing with the nut, and friction discs arranged on both sides of the nut, When lowering, by rotating the manual handle in the reverse direction to release the screw brake, only the moving range of the nut is rapidly lowered by the weight of the load. By repeating this operation, it is possible to rapidly and surely drop the load such as the water gate to a predetermined position.

〔Example〕

An embodiment of a load drive transmission device according to the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of a load drive transmission device according to the present invention, FIG. 2 is an enlarged sectional view of a portion A in FIG. 1, and FIG. 3 is a load means for a manual rotating shaft in FIG. FIG. 4 is a side view showing the relationship between the brake disc and the manual rotating shaft of FIG. 3, and FIG. 5 is a perspective view of FIG. The load drive transmission device according to the present invention shown in FIG. 1 can be applied to operate a spindle having valves such as a water gate and a gate valve shown in FIG. 9, for example. Therefore, the parts shown in FIGS. 1 and 2 have the same reference numerals for the parts having the same functions as the parts shown in FIG.

FIG. 1 shows an embodiment of a load drive transmission device with a screw brake according to the present invention. This load drive transmission is mainly composed of a spindle 2 which is a load supporting rod to which a load including a valve such as a water gate and a gate valve is attached, a rack and pinion mechanism 12 for raising and lowering the spindle 2, a speed reducer 9, and a first electromagnetic clutch. 45, the second electromagnetic clutch 47, the electric motor 46, the screw brake 11, and the manual rotating shaft 13 that can be rotated by the manual handle 1. The spindle 2 is shown in the case where a load such as a floodgate is supported by one spindle 2, but in some cases, as shown in FIG. 9, two spindles 2,
Needless to say, it may be configured to support the load such as a floodgate by 2. A load such as a valve is attached to the lower end of the spindle 2, and a rack 14 is formed in the longitudinal direction on the outer surface of the upper end of the spindle 2. A rack 14 formed on the spindle 2 meshes with a pinion 15 rotatably supported by a shaft 16 mounted on a housing 8 that serves as a support for the spindle 2. Also pinion
A guide roller 17 rotatably arranged in the housing 8 in contact with the outer surface of the spindle 2 is arranged at a position opposite to 15 in order to guide the vertical movement of the spindle 2 forming the rack 14. . That is, the rack and pinion mechanism 12 is composed of the rack 14 and the pinion 15, and the pinion 15
The rotational movement of the rack 14 is the vertical movement of the rack 14.

In addition, one end of the rotary shaft 20 of the speed reducer 9, that is, the input-side gear 22
The screw brake 11 and the gear 24 of the manual drive system on the side of the manual handle 1 and the gear 48 of the electric drive system of the electric motor 46 mesh with each other. Although not shown, in some cases, the speed reducer 9
The gears that make up can be spur gears, helical gears, or bevel gears. On the rotary shaft 20 of the speed reducer 9,
The gear 22 having a large number of teeth is provided, and the input shaft 23 of the reduction gear 9 or
Gears 24 and 48 having a small number of teeth are provided at 44. The input shafts 23 and 44 and the rotary shaft 20 are rotatably supported by the speed reducer housing 18. A gear 21 meshing with the pinion 15 is provided at the other end of the rotary shaft 20 of the reduction gear 9, that is, on the output side.

As shown in FIG. 1, the input shaft 44 constituting the electric drive system has a first electromagnetic clutch arranged in a motor housing 49.
An electric motor 49 is drivingly connected via 45. Further, the input shaft 23 of the speed reducer 9 is rotatably attached to the input shaft 23 of the speed reducer 9 by a suitable fixing means via a second electromagnetic clutch 47, with a male screw rotating shaft 25 constituting the screw brake 11 constituting a manual drive system and a brake system. Has been. The switching operation between the first electromagnetic clutch 45 and the second electromagnetic clutch 47 is achieved, for example, by operating the switching means 51 according to a command from the controller 52, or in some cases, by manually switching the switching means 51. To be achieved. The male screw rotating shaft 25 of the screw brake 11 is rotatably supported by the screw brake housing 19. A nut 28 is engaged with a male screw 26 formed on the rotary shaft 25 so as to be movable in the axial direction or integrally rotatable. Also, nut 28
A gear 40 is formed on the outer peripheral surface of the gear 40, and the gear 40 is meshed with a gear 29 fixed to the manual rotation shaft 13. The manual rotary shaft 13 is rotatably supported by a screw brake housing 19, has a manual handle 1 attached to one end thereof, and has a mechanical handle for applying a predetermined load to the manual rotary shaft 13 at the other end thereof. The dynamic load mechanism 50 is incorporated.

The screw brake 11 is configured, for example, as shown in FIG. The nut 28 including the gear 40 that meshes with the gear 29 of the manual rotary shaft 13 is configured to be movable on the male screw rotary shaft 25 by a predetermined distance in either the left or right axial direction by rotating. Of course, the moving distance is slightly larger than the gaps L ₁ and L ₂ between the ratchet wheels 32 and 36 and the nut 28 by the amount of pressing the friction disks 31 and 35. Further, disk bosses 30 and 34 arranged on both sides of the nut 28 are fixed to the rotary shaft 25 by a key 41 so as to be integrally rotatable. Between the disc boss 30 and the nut 28, for example, a ratchet wheel 32 for normal rotation is arranged, and between the disc boss 34 and the nut 28 on the opposite side, a ratchet for reverse rotation is provided. Wheels 36 are provided. Further, between the flange portion 42 of the disc boss 30 and the ratchet wheel 32, a plurality of friction discs 31 constituting a friction brake are arranged, and between the flange portion 43 of the disc boss 34 and the ratchet wheel 36. A plurality of friction discs 35, which also constitute a friction brake, are arranged in the. One ratchet wheel 32
A ratchet 33 for forward rotation, which is swingably attached to a shaft 38 attached to the screw brake housing 19, is arranged so that it can be locked. Similarly, the other ratchet wheel
A reverse rotation ratchet 37, which is swingably attached to a shaft 38 attached to the screw brake housing 19, is disposed on the 36 so as to be able to be locked. The ratchet 33 and the ratchet 37 are claws in opposite directions, so that the claws of the ratchet wheels 32 and 36 formed in opposite directions can be reliably locked,
A position is set on the shaft 38 in a state of being separated by a spring 39 and biased in the reverse rotation direction.

Next, regarding the mechanical load mechanism 50, for example, FIG.
It is constructed as shown in FIG. 4 and FIG. A radial fixing hole 58 is formed inside the bearing 53 that supports the opposite end of the manual handle 1 attached to the manual rotary shaft 13, and the transmission pin 56 is passed through the fixing hole 58. brake disc
When the manual rotation shaft 13 is inserted through the manual rotation shaft 13 and the manual rotation shaft 13 is axially supported by the bearing 53, the transmission pin 56 is set to be engaged with the radial cutout groove 59 formed in the brake disc 55. The brake lining 54 is fixed to the outer race of the bearing 53 and the housing 19, and the braking surface of the brake disc 55 is brought into contact with the brake lining 54. In this case, the brake disc 55 is pressed against the brake lining 54, and the spring 57 is arranged between the brake disc 55 and the brake lining 54 so that a predetermined frictional resistance, that is, a load is generated. In other words, in the mechanical load mechanism 50, the spring 57 always pressurizes the inner end surface of the brake disc 55 in the thrust direction of the manual rotation shaft 13,
The end surface of the brake disc 55 on the side opposite to the spring is pressed against the brake lining 54, and a load is applied in the rotation direction of the manual rotation shaft 13.

The mechanical load mechanism 50 incorporated in the drive system of the load drive transmission with a screw brake according to the present invention has a structure in which a rotary sliding resistance is applied to the manual rotary shaft 13 from the brake disc 55 and the brake lining 54 as described above. In addition to the above configuration, various design changes are possible. For example, if the pitch forming the male screw 26 of the rotating shaft 25 with a male screw is made longer, the lead becomes longer and the sliding resistance of the nut 28 with respect to the male screw 26 becomes smaller. In this case the friction disc 3
The braking force also decreases because the force pressing 1,35 is also reduced.

Alternatively, as shown in FIG. 6, the mechanical load mechanism 50A may be provided outside the housing 19 of the screw brake 11. For example, the mechanical load mechanism 50A may apply a rotational load to the manual rotary shaft 13 by installing the spring 60 between the manual handle 1 and the housing 19 with the brake disks 61 and 62 interposed.

Alternatively, as shown in FIG. 7 and FIG. 7 (A), the mechanical load mechanism 50B forms a tapered surface 66 on the outer diameter of the manual rotation shaft 13 and forms a female screw 64 on the housing 19. A male screw 67 that meshes with a female screw 64 is formed on the outer peripheral surface of the friction plate 63, and a tapered surface 65 is formed on the inner peripheral surface. The friction plate 63 is arranged between the housing 19 and the manual rotary shaft 13, and the rotary tool is locked in the cutout hole 68 of the friction plate 63 to fix the friction plate 63 to the housing.
By rotating the manual screw shaft 13 by screwing it into the female screw 64, the rotation resistance can be given to the manual rotation shaft 13.

Alternatively, as shown in FIG. 8, in the mechanical load mechanism 50C, the friction plate 70 is brought into frictional contact with the outer peripheral surface of the manual rotary shaft 13, and the adjusting screw 69 is screwed into the screw hole formed in the housing 19 to cause the spring. Friction plate 70 through 71
It is also possible to give a rotation resistance by pressing against the manual rotation shaft 13.

The load drive transmission according to the present invention is configured as described above and operates as follows.

First, a case where the spindle 2 is operated by the electric motor 46 in the load drive transmission will be described. The electromagnetic clutch switching means 51 is switched to the ON state on the side of the code M and the OFF state of the side to the code H by the command of the controller 52 or manually. The electric motor 46 is driven by a command from the controller 52. The electric motor 46 is driven by the first electromagnetic clutch 45.
The input shaft 44 is rotated through the rotation of the input shaft 44, and the rotation of the input shaft 44 is transmitted to the rotary shaft 20.
Is rotated to move the rack 14 in the vertical direction. rack
The vertical movement of 14 moves the spindle 2 in the vertical direction, and moves the load attached to the spindle 2 in the vertical direction.

Next, when the spindle 2 comes to a predetermined position and the spindle 2 is stopped at that position, the electromagnetic clutch switching means 51 is switched so that the symbol M side is in the off state and the symbol H side is in the on state, and the electric motor 46 To stop. In this state, the rotating torque is not applied to the manual handle 1 except that the mechanical load mechanism 50 applies a predetermined load. Moreover, the spindle 2 is loaded with a load including valves such as a water gate and a gate valve. Therefore, the spindle 2 rotates in the opposite direction as the spindle 2 tries to descend due to its own weight, and the rotary motion of the rotary shaft 20 is transmitted from the input shaft 23 through the second electromagnetic clutch 47 to the male screw rotary shaft.
Rotate 25. By the way, the rotation resistance of the manual rotary shaft 13 by the mechanical load mechanism 50 is larger than the sliding resistance of the nut 28 sliding on the male screw rotary shaft 25, so that the rotation of the male screw rotary shaft 25 immediately slides the nut 28. Dynamic movement, that is, along the male screw 26 formed on the rotary shaft 25, for example,
After moving a distance L ₂ + α to the left in the figure, the side surface of the nut 28 abuts against the ratchet wheel 36,
To the left in the figure. The movement of the ratchet wheel 36 presses the friction disc 35, and a torque transmission state is formed with the disc boss 34. Disk boss 34 is the rotating shaft
Since the rotation of the disc boss 34 is integrally rotated with the rotation of the rotating shaft 25 because it is keyed to the 25, the ratchet wheel 36 tries to rotate together with the disc boss 34 and the rotating shaft 25 at this time. , Since the ratchet wheel 36 is locked with the ratchet 37 for preventing reverse rotation, the ratchet wheel 36 can rotate only in one direction, but in this state, it cannot rotate in the opposite direction. There is. Therefore, even if the rotating shaft 25 tries to rotate due to the load applied to the spindle 2, the ratchet wheel 36
Cannot rotate, and thus the male screw rotating shaft 25 stops rotating. Therefore, the rotation of the rotary shaft 20 stops, and the spindle 2 stops at a predetermined position. That is, the screw brake in this load drive transmission can be surely and quickly made to function, the load of the water gate attached to the spindle 2 is prevented from dropping due to its own weight, and it is extremely safe. Become.

Next, the operation of raising the spindle 2 by the manual handle 1 in the load drive transmission will be described. The electromagnetic clutch switching means 51 is switched to the ON state on the code H side and to the OFF state on the code M side by a command from the controller 52 or manually. When the manual handle 1 is rotated clockwise (hereinafter, reverse rotation), the manual rotation shaft 13
Rotates, and the rotation of the manual rotation shaft 13 causes the gear 29 to rotate. Rotation of gear 29 causes nut 28 to rotate. Since the male screw rotating shaft 25 is loaded with a valve or the like mounted on the spindle 2, a predetermined torque is applied to the rotating shaft 25 and the rotating shaft 25 is in a stationary state. Therefore, the rotation of the nut 28 moves along the male screw 26 formed on the rotary shaft 25 to the left in the figure by the distance L ₂ + α,
The side surface of the nut 28 abuts on the ratchet wheel 36 and moves the ratchet wheel 36 to the left in the drawing. The movement of the ratchet wheel 36 presses the friction disc 35, and a torque transmission state is formed with the disc boss 34. Since the disk boss 34 is keyed to the rotary shaft 25, the rotation of the disk boss 34 causes the rotary shaft 25 to rotate. At this time, since the ratchet 37 for preventing reverse rotation is locked to the ratchet wheel 36, the ratchet wheel 36 is adapted to rotate only in one direction. Therefore, by rotating the ratchet wheel 36 with a torque that is equal to or greater than the torque at which the rotary shaft 25 is rotated by the load applied to the spindle 2, the ratchet wheel 36 is rotated reliably and without reverse rotation. The rotation of the rotary shaft 25 becomes the rotation of the input shaft 23 of the speed reducer 9, and then the rotation of the input shaft 23 rotates the gear 24.
The output is output from the output shaft 20 after being decelerated via the gear 22. The rotation of the output shaft 20 transmits the rotation to the pinion 15,
The rotation of the pinion 15 raises the spindle 2.

Further, regarding the operation of lowering the spindle 2 by the manual handle 1 in the load drive transmission, similarly,
The electromagnetic clutch switching means 51 is switched by a command from the controller 52 or manually so that the code H side is on and the code M side is off. This is achieved by rotating the manual handle 1 in the opposite direction to the above-described raising operation, that is, in the counterclockwise direction (which is a forward rotation). However, the spindle 2 is usually loaded with a load such as a water gate and a valve such as a gate valve. Therefore, the spindle 2 can be easily and intermittently and quickly lowered by releasing the brake state of the screw brake 11 without rotating the manual handle 1 in order to lower the spindle 2. . That is, since the spindle 2 is usually loaded,
The load is a pinion 15, an output shaft 20, a speed reducer 9, an input shaft 23,
It is transmitted as torque to the second electromagnetic clutch 47 and then to the rotating shaft 25 with a male screw. Therefore, the rotating shaft with male thread 25
The rotation of the nut 28 causes the nut 28, for example, to the right of the figure a distance L ₂ +
When moved by β, the nut 28 presses the ratchet wheel 32 and presses it against the disc boss 30 through the friction disc 31, so that the rotation of the rotary shaft 25 is braked. Therefore, the manual handle 1
Is rotated, the rotation of the manual handle 1 rotates the nut 28. The rotation of this nut 28 is achieved by the rotation shaft 25 with a male screw.
Since the male screw 26 is stationary, the male screw 26 is guided by the male screw 26 and moves to the other ratchet wheel 36 side. Here, if the rotation of the manual handle 1 is stopped, torque is applied to the rotary shaft 25 in the direction of lowering the spindle 2 due to the load, so the rotary shaft 25 immediately rotates in the direction of lowering the spindle 2 and the nut is rotated. 28 is moved to the ratchet wheel 32 side again. Nut 28 is ratchet wheel
When the state of pressing the 32 is reached, the rotation of the rotary shaft 25 stops at that point and the lowering of the spindle 2 also stops. However, if the manual handle 1 is rotated again as described above, the nut 28 will move to the predetermined position. Although it moves a distance, that is, a distance L ₁ + L ₂ + α + β, the spindle 2 descends again after rotating by the number of rotations of the rotary shaft 25 corresponding to the distance. Therefore, if the rotating operation of the manual handle 1 is repeated, the spindle 2 can quickly and reliably descend intermittently by its own weight,
For example, a valve such as a water gate can be urgently lowered to close the water channel when the river is flooded.

[Effect of device]

The load drive transmission with a screw brake according to this invention is
It is configured as described above and has the following effects. That is, this load drive transmission device with a screw brake is
A speed reducer incorporated in a drive unit for driving a load such as a water gate, an electric motor connected to an input shaft of the speed reducer via a first electromagnetic clutch, a screw brake connected to the input shaft via a second electromagnetic clutch, and Switching means for switching ON / OFF states of the first electromagnetic clutch and the second electromagnetic clutch, a manual rotation shaft connected to the screw brake, a mechanical load device provided for the manual rotation shaft, and the manual rotation. Since it consists of a manual handle attached to the shaft, simply switching the first electromagnetic clutch or the second electromagnetic clutch can easily switch the drive system for raising and lowering the load such as the floodgate to either automatic operation by a motor or manual operation. You can Further, when the load is urgently lowered, the load is lowered immediately and surely by its own weight simply by releasing the electromagnetic clutch, or automatically, or in some cases simply manually releasing the screw brake. It is possible,
Furthermore, by applying a constant load to the rotation of the manual rotary shaft in the screw brake, the sliding resistance of the screw part of the screw brake is set to be smaller than the rotation resistance of the manual rotary shaft, so that the manual rotary shaft can rotate freely. Without causing the screw brake to function reliably and quickly, prevent the load from dropping due to its own weight,
It will be extremely safe. Therefore, the load can be quickly lowered compared to the load lowering speed in the conventional load drive transmission system using the worm and the worm wheel, and for example, the floodgate can be shut off urgently.
Moreover, by applying a load to the rotation of the manual rotation shaft, the sliding resistance of the threaded portion can be made relatively smaller than the rotation resistance of the manual rotation shaft, and the load can be moved to a predetermined position. Can be stopped.

Therefore, when the load of the floodgate, the valve, etc. is lowered, particularly when it is urgently lowered, the manual rotating shaft is rotated by the manual handle and the screw brake is simply released to rapidly lower the load by its own weight. You can also Therefore, the load can be quickly lowered compared to the conventional speed at which the load is lowered by the worm and the worm wheel, and, for example, the floodgate or the like can be lowered suddenly and the water channel can be cut off urgently. Moreover, the operation is extremely simple, and the structure itself can be made compact.

Further, in this state, if the manual handle 1 is rotated in the direction in which the friction disc is disengaged, the water gate and the like are lowered by its own weight.
Even when the electric motor cannot be operated due to a power failure, it is possible to operate or close the load such as the floodgate. Further, if the manual handle is rotated in the same direction as described above, the water gate or the like can be surely landed and the water leakage can be stopped.

Of course, if the manual handle is rotated in the opposite direction to the above-described direction, the rotational torque is transmitted from the load drive transmission device to the reduction unit of the electric reduction mechanism, and the water gate and the like are raised.

The electromagnetic clutch can be turned off to open and close the water gate or the like by normal operation of the electric motor, and the water gate can be moved up or down by turning on the electromagnetic clutch of the electric motor.

Further, the screw brake in the load drive transmission device with a screw brake is a nut provided with a gear that meshes with the manual rotation shaft, a rotation shaft with a male screw that meshes with the nut,
Disc bosses arranged on both sides of the nut and integrally rotating with the male screw rotating shaft, ratchet wheels arranged between the nut and the disc boss via friction discs on the disc bosses, respectively From a forward rotation ratchet that locks to the ratchet wheel to regulate the forward rotation of the ratchet wheel, and a reverse rotation ratchet that locks to the other ratchet wheel to regulate the reverse rotation of the ratchet wheel Since it is configured, the nut that is screwed to the male screw rotating shaft that constitutes the screw brake slides smoothly without rotating, and the screw brake reliably pressurizes the friction disc via the ratchet wheel, and the male screw is attached. Converts the rotation direction of the rotating shaft to the thrust direction to put the screw brake in the brake operating state. , It holds the stop state without sluices or the like is lowered. Further, when the load is lowered, if the manual handle is rotated in the reverse direction to release the friction brake of the screw brake, the load is rapidly lowered by the weight of the load by the moving range of the nut. By repeating the simple operation of rotating the manual handle in the reverse direction, the load such as the sluice is intermittently brought to a predetermined position, but rapidly and surely, and the operation force for rotating the nut is sufficient. The load can be lowered without requiring the operating force.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a load drive transmission device according to the present invention, FIG. 2 is an enlarged sectional view of a portion A in FIG. 1, and FIG. 3 is a load means for a manual rotating shaft in FIG. FIG. 4 is a side view showing the relationship between the brake disc of FIG. 3 and the manual rotary shaft, FIG. 5 is a perspective view of FIG. 3, and FIG. 6 is a manual rotary shaft of FIG. FIG. 8 is a front view showing another example of the load means provided in FIG. 7, FIG. 7 and FIG. 7 (A) are sectional views showing still another example of the load means provided in the manual rotary shaft of FIG.
FIG. 1 is a sectional view showing another example of the load means provided on the manual rotary shaft of FIG. 1, and FIG. 9 is a schematic view showing an example of a conventional water gate. 1 ... Manual handle, 2 ... Spindle, 9 ... Reducer, 11 ... Screw brake, 12 ... Rack and pinion mechanism, 13 ... Manual rotating shaft, 14 ... Rack, 15 ... Pinion, 20 ... … Output shaft, 23,44 …… Input shaft, 25 …… Rotary shaft with male screw, 26 …… Male screw, 28 …… Nut, 29 …… Gear,
30,34 …… Disc boss, 31,35 …… Friction disc, 32,3
6 …… Ratchet wheel, 33,37 …… Ratchet, 45…
... 1st electromagnetic clutch, 46 ... electric motor, 47 ... 2nd electromagnetic clutch, 50, 50A, 50B, 50C ... mechanical load mechanism, 51 ... switching means, 52 ... controller.

Claims (2)

[Scope of utility model registration request] 1. A speed reducer incorporated in a drive system for driving a load such as a water gate, an electric motor connected to an input shaft of the speed reducer via a first electromagnetic clutch, and a motor connected to the input shaft via a second electromagnetic clutch. Screw brake, switching means for switching on / off states of the first electromagnetic clutch and the second electromagnetic clutch, a manual rotating shaft connected to the screw brake, and a mechanical load device provided for the manual rotating shaft. And a load drive transmission device with a screw brake, which comprises a manual handle attached to the manual rotation shaft. 2. The screw brake includes a nut having a gear that meshes with the manual rotation shaft, a rotation shaft with a male screw that meshes with the nut, and a disc boss that is arranged on both sides of the nut and rotates integrally with the rotation shaft with the male screw. , Ratchet wheels disposed between the nuts and the disc bosses via friction discs on the disc bosses, respectively, and positively locking the ratchet wheels on one ratchet wheel to prevent the ratchet wheel from rotating in the forward direction. 2. The load drive transmission device with a screw brake according to claim 1, comprising a rotating ratchet and a reverse rotating ratchet that is locked to the other ratchet wheel and restricts rotation of the ratchet wheel in the opposite direction.