JPH0537733U - Conveyor motor overload protection device - Google Patents

Abstract

(57) [Summary] [Structure] In a conveyor for transportation driven by a motor via a belt, one end of a motor mounting base is rotatably supported and the other end is supported by an elastic member, When one end of the installation base of the motor is rotated as a fulcrum, a limit switch, which opposes the other end and stops the supply of electric power to the fixed motor, operates to stop the motor. [Effect] If the motor is overloaded with a sudden load due to catching of conveyed goods on the conveyor, the motor installation base will immediately overcome the elastic force of the elastic member and rotate, and the limit switch will operate at this time. Since the power supply to the motor is then stopped, the motor can be protected from overload quickly and surely.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a conveyor with a motor used for transporting a work, and particularly to protect the motor under an overload in order to prevent the motor from being burned or the like caused by being driven in an overloaded state of the motor. Related to the device.

[0002]

[Prior Art]

 Conventionally, in order to protect the motor under overload, a thermal relay is built into the circuit that supplies the drive current to the motor, and when the load current of the motor exceeds a specified value, the contact of the thermal relay opens. Since the circuit is cut off, the motor stops and protects the motor from burnout due to overload.

[0003]

[Problems to be solved by the device]

 Although it is possible to protect the motor from burnout of the motor due to overload by operating the above-mentioned thermal relay, however, the reaction of the thermal relay is slow to a sudden load due to catching of conveyed products on the conveyor. Therefore, there is a problem that the motor burns out before the thermal relay operates and the motor stops. The present invention has been made to solve the above problems, and an object of the present invention is to provide a device for quickly stopping a motor against a sudden load such as a catch of a conveyed product.

[0004]

[Means for solving problems]

 Therefore, according to the present invention, in the conveyor conveyor driven by the motor through the belt, the installation base of the motor pivotally supports one end in a direction perpendicular to the axial direction of the motor. , A detector that supports the other end by an elastic member and stops the power supply to the fixed motor facing the other end when rotating with one end of the mounting base of the motor as a fulcrum. There is provided an overload protection device for a conveyor motor, which is activated to stop the motor.

[0005]

[Action]

 According to the above configuration, a sudden load due to a catch of a conveyed product on the upper part of the conveyor causes a load on the motor via the belt. At this time, the tension of the belt causes one end of the mounting base of the motor to be a fulcrum and the other end to rotate against the elastic member. The rotation activates the detector to cut off the energizing circuit of the motor, so that the motor stops immediately and the motor can be quickly protected from burnout or the like due to overload.

[0006]

【Example】

 Next, an embodiment of the present invention will be specifically described with reference to FIG. In the present embodiment, as an example, an overload protection device for a conveyor motor in which a driving motor is placed on the upper part of the conveyor and the conveyor is driven via a V-belt to convey a product to be conveyed will be described.

As shown in FIG. 1, the motor mounting base 2 is rotatably supported by a conveyor frame 3 by a link 4 at one end 2 a of a conveyor 14 via a bearing 5. A motor 1 with a speed reducer is attached to the motor mounting base 2 at a substantially central portion. The other end 2b of the motor mounting base 2 has a long hole 6 formed therein, and the bolt 7 fixed to the conveyor frame 3 is inserted into the long hole 6 so that the motor mounting base 2 can be rotated. Has been A nut 8 is screwed onto the upper end of the bolt 7, and a compression spring 11 is inserted between the nut 8 and the conveyor frame 3 via a washer 9, a motor mounting base 2 and a washer 10. Further, a limit switch 12 fixed to the conveyor frame 3 is provided so as to face the other end 2b of the motor mounting base 2. A conveyor 14 is connected to the motor 1 with speed reducer via a V-belt 13, and this conveyor 14 is a load of the motor 1 with speed reducer.

Next, the operation of the above configuration will be described. When electric power is supplied to the motor 1 with speed reducer via a power supply circuit (not shown), the motor 1 with speed reducer rotates, for example, clockwise, and drives the conveyor 14 clockwise through the V-belt 13. . While the conveyor 14 is operating within the predetermined load fluctuation range, the tension applied to the conveyor 14 via the V-belt 13 is smaller than the elastic force of the spring 11, so the motor mounting base 2 does not rotate, The motor with reduction gear 1 continues stable rotation. When the conveyor 14 is in an overload state, such as when it receives a sudden restraining force due to a catch of a conveyed product and stops, and when excessive downward tension is applied to the motor 1 with a reducer via the V belt 13, With the fulcrum 4 as a fulcrum, the motor mounting base 2 receives a rotational force in the clockwise direction in the figure, overcomes the compression spring 11, and the other end 2b of the motor mounting base 2 is lowered. At this time, the limit switch 12 is hit by the other end 2b, the energizing circuit of the motor 1 with a speed reducer is cut off, and the motor 1 with a speed reducer stops. The present invention is not limited to the details of the structure of the above-described embodiment. For example, the compression spring 11 is a tension spring, and is stretched between the conveyor frame 3 and the other end of the motor mounting base 2. Alternatively, the elastic member may be replaced with another elastic member. Further, the limit switch 12 can be replaced with another detector that can detect the rotation of the other end 2b. Further, the V-belt 13 can be replaced with a chain or other tension driving member for driving a load. Further, various modifications, such as the mounting posture of the motor 1 with reduction gear to the motor mounting base 2 is below the motor mounting base 2, also belong to the present invention.

[0009]

[Effect of the device]

 As described above, since this device has the above-mentioned structure, the motor mounting base immediately causes the elastic force of the elastic member to be applied to the motor immediately when an excessive tension is applied to the motor due to a sudden load such as catching of a conveyed product on the conveyor. Since the limit switch is activated to stop the power supply to the motor at this time, the motor is protected from overload quickly and surely. There is.

[0010]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Motor with reducer 2 Motor mounting table 3 Conveyor frame 4 Link 5 Bearing 6 Slot 7 Bolt 8 Nut 9, 10 Washer 11 Compression spring 12 Limit switch 13 V belt 14 Conveyor

Claims (1)

[Scope of utility model registration request] 1. In a conveyer conveyor driven by a motor via a belt, an installation base of the motor rotatably supports one end portion in a direction perpendicular to the axial direction of the motor and the other end portion thereof. The motor is supported by an elastic member, and at the time of rotation about one end of the mounting base of the motor as a fulcrum, a detector that is opposed to the other end and stops power supply to the fixed motor is operated to operate the motor. An overload protection device for a conveyor motor, which is characterized by stopping.