JPH03204476A - Belt change gear controller - Google Patents

Abstract

PURPOSE:To enable maintenance work while an equipment is mounted by enabling automatic control owing to a combination of a servo regulation circuit which has a feedback control system and a pilot controller which operates in conjunction with a pulley and forming one end of output pulley as a free end. CONSTITUTION:A temperature detector 68 is mounted to a cooling tower 10, and connected to a servo regulator 70 which has operational amplifiers 72, 74 and output circuits 77, 78 on acceleration and deceleration sides. The output circuits 77, 78 are connected to a pilot controller 29, which has a reversible motor 79. Electric power is supplied to power supply ends S', T' from S, T terminals of the power supply line 83 of a main motor 27. On the other hand, a start and stop circuit 80 and a low temperature control circuit 81 are connected to the power line 83. In the above constitution, complete automatic control becomes possible owing to a combination of a turbo regulation circuit 70 with the pilot controller 29. Also, an intermediate rotary shaft 52 is supported on one hand, and a shaft support 60 is capable of making slide adjustment against a frame 45. Consequently, replacement of belt is simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention solves the problem of the danger of speed change operations by an operator and the inconvenience of remote locations when driving load equipment such as a large blower fan with variable speeds. However, the present invention relates to a method for automatically controlling a belt transmission by modifying the belt transmission so as to eliminate this danger.

[Prior Art] FIG. 5 shows a schematic diagram of a conventional belt transmission. In the diagram, A is the electric motor, B is the belt transmission, C is the housing, and D
is an operating handle, E is an output shaft, and F is an input shaft. Furthermore, the housing C is composed of a frame G, a plurality of lids, J and I, and inside there are variable pulleys L on the drive side and driven side,
A speed change bell hM is wound between N and N. Further, O and P are bearings.

The speed change operation is performed by rotating the operation handle D, thereby sliding the sliding boob of the pulley device, and changing the radius of the sliding circumference between the belt and the pulley to control the change.

In this case, the input shaft F is an electric motor rotating shaft, and the variable pulley L is installed on the free bridge thereof and is inserted from the plane on the frame GOa side and fixed with a flange.

On the other hand, the output shaft E has bearings on both sides of the variable pulley N.
P, has a biaxial support structure, and the left and right IEI
3. This bearing at rz 0. I support P.

A vehicle speed reducer is integrally assembled, and a load device is installed on the output shaft (not disclosed) of the gear reducer in the state of this integrally assembled assembly, or the belt transmission is Assembling the blower fan directly to the output shaft E itself is
Although it is theoretically possible, when the load and equipment become large, it is extremely dangerous for an operator to approach and operate such a belt transmission.

Moreover, even if this problem could be solved by using a remote automatic pricing system, determining the actual technical means to implement automatic control is itself a big problem, and even if it were possible to solve it, it would be even worse. A new problem arises. In other words, when a belt transmission is operated using an automatic control system, the operating time is inevitably continuous and long, and moreover, the repeated speed-up and deceleration operations may be caused by accidental acceleration or deceleration, or the belt-pulley contact surface of the friction transmission part may be damaged. Autonomous driving often causes the belt to wear out in a short period of time without the operator noticing, as the belt generates heat.

However, in the structure shown in Fig. 5, the output shaft to which the output pulley device N is attached has a double bearing structure, so when frequently replacing the belt, the belt transmission itself must first be replaced. Such maintenance work must be performed after removal from a planetary gear reducer or the like or from a load device, which is unavoidably complicated and uneconomical.

[Purpose] In order to solve the above-mentioned problems, the present invention first realizes remote automatic control by combining a pilot electric control machine interlocked with a boolean device and a servo adjustment device, and
Another object of the present invention is to provide a belt speed change control device that can be put into practical use by adding a structure to a speed-up/deceleration type belt transmission to deal with problems such as belt wear that occur with automatic operation.

[Technical means for solving the problem] In the belt speed change control device of the present invention, a pulley device in which a variable belt is held between fixed and sliding pulleys is provided on the input shaft and intermediate shaft, respectively, to increase the input power. an increasing/decelerating type belt transmission that operates as a speed gear or a speed reducer, a pilot electric control machine connected to the boob device on the input shaft side and attached to the frame of the belt increasing/decelerating type belt transmission, and the above-mentioned intermediate A reduction gear coupled to the shaft and having a load attached to the output shaft, and a servo adjustment circuit that is directly electrically connected to the pilot electric controller and feedback-controls the gear ratio of the pulley device are provided, and the output shaft side pulley The device has a cantilever support structure in which one end is pivotally supported and the other end is a free end.

[Function] According to this structure, dangerous load equipment can be automatically controlled from a remote location by the operation of a servo adjustment circuit with a feedback control system and a pilot electric controller that works in conjunction with the input shaft side pulley device. Achieved in ideal form. Moreover, since one end of the output shaft side boob device is formed as a free end, there is no need to remove the transmission and motor from loads such as planetary gear reducers before performing maintenance work such as belt replacement. Work can be done with the equipment assembled.

[Example〕 FIG. 1 is a sectional view of a transmission according to an embodiment of the present invention.

In this transmission 26, a frame body 45 and a lid body 46 form a housing 28, and a sealed chamber is formed to prevent raindrops and moist air from entering. Inside, a speed change belt 53 is provided on the motor rotation shaft, that is, the input shaft 51, and the intermediate rotation shaft 52, respectively.
A pair of pulley devices 54 consisting of fixed pulleys 54a, 55a and sliding pulleys 54b, 55b for holding the
55 is installed. A spiral centrifugal blower device 56 consisting of an impeller 56b attached to a sliding pulley 54b and a spiral casing 56a is attached to the drive side boolean device 54, and a portion of the casing 56a communicates with the piping 36'. As shown in the application example in Fig. 3, which will be described later, the introduction pipe 36
It communicates with

Thereby, heat radiation air is forcibly introduced into the room from the outside and is discharged from the outlet 37 provided in the lid 46. Viloft electric system? 1l129 is connected to the change adjustment screw 57, and as the adjustment screw 57 rotates, the guide ring 58 moves up and down, thereby causing the fixed pulley 54a and the sliding boo 'J
54a is adjusted to control the gear ratio. 4
Reference numeral 9 denotes a well-known cambling, which is configured to be removable when the pilot controller 29 is removed from the housing 28 together with the support frame 48. In addition, pilot controller 2
9 may be of any other known structure, for example, it may be one in which the bending lever K shown in FIG. It is fine as long as it is configured freely.

Now, when the pilot controller 29 is activated and the sliding disc wheel 54b begins to slide accordingly, the contact circumferential radius between the pulley device 54 and the variable belt 53 changes. Even on the driven side, which is simply held by the spring force, the belt 53 is connected to the drive side boolean IJ.
54, the contact circumferential radius changes, and the gear ratio is controlled by this cooperative automatic adjustment. Note that when this type of device structure is installed in a dangerous location such as the top of a building, it is necessary to prioritize maintenance work as much as possible, and in the present invention, the intermediate rotating shaft 5 is
2 is cantilevered by two hair rings 59a and 59b. Furthermore, the structure of the housing 28 is such that the cover body 46 can be separated from the frame body 45, and accordingly, the shaft support body 60 can be adjusted by bolts 62 so that it can be slid with respect to the frame body 45. Mechanism and long hole 6
1. As a result, by loosening the bolt 63 and operating the hoisting bolt 62, both the support body 60 and the boot can be moved in the direction of the input shaft, thereby simplifying belt replacement. Note that other methods may be used for replacing the belt; for example, the output shaft 52 may be fixed so that it cannot be moved, and only the fixed disk bundle 55 may be removed. The upper surface of the lid 46 of the housing 28 is D-shaped or horseshoe-shaped and is opened at a considerable height, so that the side surface of the straight portion of the D-shape is cup-shaped. There is. Therefore, the operation of moving or removing the pulley 55 is speeded up.

Next, an adjustment circuit device for fully automatic control when this belt transmission 26 is applied to control the rotation of a blower in a cooling tower or the like will be described.

FIG. 2 is a block circuit connection diagram of an adjustment circuit device for automatically controlling the cooling water temperature of the cooling tower 10. A temperature detector 68 is provided in the cooling water population 66 of the cooling tower 10, and a servo regulator 7
Connected to 0. The servo regulator 70 is a bridge circuit 7
1, operational amplifier 72, filter 73, operational amplifier 74,
It is composed of a positive feedback circuit 75, a dead band circuit 76, and speed increasing and decelerating side output circuits 77 and 78. Further, the output circuits 77 and 78 have their contacts 77a and 78
It is connected to the pilot controller 29 via a. Pilot controller 2 having this reversible motive 79
The power supply terminals S' and T' to the main induction motor 27
is supplied from the S and T terminals of a three-phase power line 83. On the other hand, this power line 83 has a start/stop control circuit 8.
0 and the low temperature section control circuit 81 are connected.

The operation of this regulator is as follows. Start switch S
When W is pressed, the relay 3R operates via the normally closed contact 2R2, and while the contact 3R1 is self-holding, the voltage of the regulator 70 (not shown) is turned on, and the regulator 70 operates, but the pilot controller 29 does not operate because the contact 4R2 is open. Next, while the temperature of the cooling water is maintained within the proportional operation region of the regulator 70, the mechanical temperature detector 68 for low temperature region control is closed, so the low temperature region control circuit 81 is activated when contact 3R1 is closed, and at this time, contact 3R2 is closed and relay 4R is energized. Therefore, the main blower motor 27 operates via the three contacts 4R1. At the same time, the pilot section 29 operates by closing the ink lock contact 4R2 to perform normal proportional control operation.

At this time, if the outside air wet bulb temperature is constant, the rotation speed of the blower fan will increase as the cooling water temperature rises, but even if the high limit switches H and L of the pilot controller 29 are opened, the blower fan will not reach its maximum speed. Continuously operate at increased speed. In this case, the cooling state is determined by the required cooling capacity of the cooling tower, but if the cooling water temperature drops too much and the rotation speed of the blower fan is maintained at a high speed, the cooling water will become supercooled, and the large electric motor of the compressor will It was causing damage. Therefore, when the cooling water temperature drops, the low limit switch L,
Even when L is opened and relay IR is opened, relay 3R is still excited by contact 2R2, so main blower motor 27 continues to rotate and blower fan 21 rotates at the lowest speed.

At this time, if the cooling water temperature drops further like in winter,
The liquid-filled inlet water or outlet water temperature detector 68 or 69 is activated, the relay 4R is deenergized, and the main motor 27 is activated.
It is now possible to stop the That is, in a temperature range where the cooling water temperature is within the proportional band region of the regulator 70, the rotation speed of the blower fan is proportionally controlled according to the temperature,
The main electric motor 27 is configured to be switched to automatic start/stop control when the temperature falls below the proportional band region.

Next, when you want to completely stop the blower, press the stop switch SW.
, the relay 2R is energized, contacts 2R1 and 2R2 are reversed, and at the same time, the contacts (not shown) of the bridge circuit 71 of the regulator 70 are activated to generate a signal that only the deceleration output circuit 78 is activated. Send. Then, the pilot controller 29
In response to this deceleration command, low limit switches L and L will eventually open, relay IR will be deenergized, and contact I will open.
R1 is opened, relay 3R is deenergized, regulator 70 stops operating, and relay 4R is also stopped via its contact 3R2. In other words, the start/stop control circuit 80 performs slow start control in this way, and when stopped, the belt 53 is stopped at its maximum deceleration, achieving ease of maintenance, and at the same time, at the next restart, the constant air blowing is performed. The fan is started from the lowest speed and lightest load condition. Therefore, especially at the time of starting, not only does auxiliary equipment such as a reactor starter become unnecessary, but the belt of the transmission is also protected, extending the life of the belt and the transmission.

As mentioned above, the transmission of the present invention includes an automatic control adjustment circuit device, and can only be realized in combination with this.Next, a specific application example of this transmission will be applied to a cooling tower blower. The layout diagram for this case will be explained next.

FIG. 1 shows a partial cross-sectional view of a double suction type cross-flow cooling tower 10 as an example. In the figure, 11 is a water tank, 12 is an air suction roller, 13 is a filling material, 14 is an eliminator, and 15 is a partition wall, and above these, cooling water is supplied from an inlet pipe 17 to a sprinkler channel 16. . Further, a cylindrical fan stack 24 is installed in the center, and an air outlet 20 is provided at the top of the stack, and a blower fan 21 and a gear reducer 22 are installed in the center of a pipe stay 23 that is radially installed. be done. The configuration of the cooling tower described so far is already known.

Furthermore, on the top plate 25 adjacent to the fan stack 24,
A variable power transmission 26 is installed which includes an induction motor 27, a pilot controller 29, and an increase/decelerate type transmission 28 in which the motor 27 and the controller 29 are integrally assembled. Further, the rotational output of this transmission is coupled to the gear reducer 22 by a coupling 30 and a transmission body 31.

The transmission 26 also has a mechanism in which the cooling air is circulated through the closed chamber of the transmission 26 from the cooling air inlet 35 through the piping 36 and then released from the exhaust port 37 in order to prevent frictional heat between the belt and the pulleys. It is designed to improve the belt life rate.

Furthermore, this speed-up/deceleration type transmission 26 can be adjusted in position in the longitudinal direction by a bolt 38 and in the vertical direction by a plurality of bolts 39, making it easy to align the axis of the coupling 30. 40 and 41 are wiring for power supply and control signals.

[Other Examples]

In the above embodiment, the pilot controller is an electric type, but it is not limited to an automatic control type, but any type that can be easily attached and detached from the housing, such as a conventional manual control type that rotates a known operating handle, may be used. It may also be a model.

In addition, when replacing the belt, the belt is not limited to a type in which the output shaft can move in the direction of the input shaft as in this embodiment, but instead, as is conventionally known, two circular belts attached to the output shaft can be replaced. A method may also be used in which only the plate wheel located closer to the free end of the plate wheel is removed from the output shaft.

〔Effect of the invention〕

According to this invention, belt transmissions, which conventionally could not be controlled manually using a steering wheel, can now be controlled automatically even in remote locations by working together with a pilot electric controller and a servo adjuster. . For example, even if dangerous load equipment is connected to such a belt transmission, long-term continuous automatic control can be reliably realized. In particular, the belt converter uses surface contact to achieve frictional transmission, unlike other metal friction type continuously variable transmissions that use point contact transmission.As a result, stable transmission is achieved, and as a result, it has sufficient durability even for large-capacity load equipment. There is a benefit to maintaining reliability and expanding the application field of belt transmissions.

On the other hand, a new problem caused by this automatic control is the increased frequency of belt replacement due to continuous duty.Since one end of the output pulley device is configured as a free end, the maintenance cover and pilot control It has the advantage that it can be easily applied by simply removing the . At that time, there is no need to separate and remove the belt transmission itself from the load device such as a blower fan, and after opening the lid with the belt transmission still attached to the load device, the intermediate shaft can be opened as shown in the embodiment of this technology. The belt can be easily and quickly removed by moving the belt manually in the direction of the shaft, or by conventionally known methods such as removing only one disk wheel of the variable boob attached to the intermediate shaft. Can be exchanged.

Furthermore, by setting one end of the output pulley device as a free end, the intermediate shaft can be driven by a shaft with a separate reduction gear via a coupling, or can be driven by a belt. It is also possible to assemble the transmission frame integrally with the transmission frame on the opposite side of the input shaft, and in that case, the belt can be easily replaced, so it is extremely useful.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of a transmission according to an embodiment of the present invention, Fig. 2 is a wiring diagram of an automatic control adjustment circuit device when the same transmission is applied to a blower, and Figs. 3 and 4. Both show external configuration diagrams when the same transmission is applied to a cooling tower blower. Further, FIG. 5 shows a schematic configuration diagram of a conventional belt transmission. In the figure, 10...Cooling tower, 21...Blower fan, 22...Constant speed ratio reducer, 27...Forced air motor, 28...Transmission, 29...Pilot controller, 51 ...Human power axis,
52... Intermediate shaft, 70... Adjustment circuit device, 80...
Start/stop control circuit, 81...low temperature section control circuit.

Claims (4)

[Claims] (1) A speed-up/down type belt transmission in which a pulley device in which a variable belt is held between fixed and sliding pulleys is provided on the input shaft and intermediate shaft, respectively, and operates as a speed increaser or speed reducer in response to the input power, and an input shaft a pilot electric control machine connected to the above-mentioned pulley device on the side and attached to the frame of the above-mentioned speed-up/deceleration type belt transmission; a reducer connected to the intermediate shaft and having a load attached to the output shaft; and the pilot electric control machine. and a servo adjustment circuit that is directly electrically connected to feedback control the speed ratio of the pulley device, and the output shaft side pulley device is cantilever supported with one end being pivotally supported and the other end being a free end. A belt speed change control device formed by forming a structure. (2) The servo adjustment circuit has a forced command circuit that gives a deceleration command to the speed increasing/decelerating type belt transmission when the input shaft is stopped, and when the input shaft is in the maximum deceleration state, the rotation of the input shaft is stopped. Claim 1 comprising a stop control circuit
Belt speed change control device as described in . (3) The belt speed change control device according to claim 1, wherein the frame body has a ventilation device on the free end side of the output shaft for radiating heat inside the room. (4) When the pilot electric controller is removed, the frame body is located in front of the free end side of each pulley device of the input shaft introduced from one plane side of the frame body and the output shaft introduced from the other plane side. 2. The belt speed change control device according to claim 1, wherein openings closed with removable lids are formed at the positions of the belts.