KR100242687B1 - Torque controllable electric wrench and control device therefor - Google Patents

Abstract

The present invention provides an electric wrench and its control apparatus for maintaining the tightening torque uniformly in a predetermined state by using the motor power of the electric wrench capable of adjusting the tightening torque.

According to the present invention, a motor and an operation switch are connected to a power supply in series for this purpose. The present invention includes a tightening torque setting means, a microprocessor for outputting an analog value by the tightening torque setting means, and a value by a microprocessor. And a comparator for comparing and outputting a voltage value corresponding to the magnitude of the current flowing through the motor, a microprocessor configured to control the current flowing through the motor by the value of the comparator and the output of the phase detector, and the current flowing through the motor. Electric wrench control device that can adjust tightening torque by installing photo coupler between switching means for control and reducer in a row with the output shaft of the motor as a solar gear, and can be obtained by torque by forming a sequential planetary gear Suggest a wrench.

The present invention makes it possible to reliably assemble or fasten equipment or mechanisms by tightening bolts or nuts with optimum torque, and to increase the durability of equipments and mechanisms, and to make the case of the reducer up and down easily. In addition, by forming the output shaft with a sun gear, it is an invention to obtain a straight wrench.

Description

Electric wrench with its tightening torque and its control device

The present invention relates to an electric wrench and a control device capable of adjusting the tightening torque and tightening the beams in a large building, a large mechanical device, and a bridge construction, and more particularly, for beam fastening in various construction sites. The present invention relates to an electric wrench and a control device capable of adjusting the torque to tighten the bolt or nut to the optimum torque at the nut and bolt and the machine assembly site.

As you know, as the industry develops, large buildings are being built. It is well known that H-beams are used together with bridges to construct such large-scale buildings in a short and simple time.

In buildings using such beams, bolts and nuts are frequently used as a means of fastening the beams together with welding. They are suitable for the precision and robust assembly of machines in various machinery. It is being tightened by torque.

In such an ultra-large building or precision machine, the assembling state is smoothly maintained when the fastening bolt or nut is not loosened and is not broken and a stable fastening state is maintained.

In order to maintain a stable tightening as described above, the tightening torque must be constant so that the operator checks the tightening torque while working.

However, conventionally, in order to tighten bolts and nuts, it is common to use a torque control driver that uses pneumatic or an electric wrench that uses the power of an electric motor. Hand tools are also used.

There is no way to adjust the tightening torque precisely when tightening bolts or nuts using a common automatic wrench or hand tool. Therefore, at each site, an appropriate automatic wrench can be purchased or a hand tool such as a spanner can be used with a proper force. By turning it, tightening torque of bolt and nut is made to be appropriate.

Therefore, there is a problem that the deviation of the tightening torque inevitably becomes large to ensure a stable assembly state.

As described above, in the conventional torque wrench, there is no means for controlling the torque, so that the bolt or nut is tightened and the torque of the fastened bolt is checked using a separate torque coefficient. Work must be done together.

This complexity not only makes the work very difficult, but also makes the work difficult, time consuming and dangerous.

In other words, this work is an element that causes an accident because the work is performed in an extremely unstable state due to strong winds and dizziness at high altitudes when the tower crane is on the ground or on the beams of bridges and buildings. have.

The electric wrench is made in Japan and Germany, and such a wrench forms a helical gear on the output shaft of the motor and interlocks with a planetary gear to form an "a" shape in which the wrench protrudes to one side, making it difficult to work in a narrow space. But it is very difficult to manufacture and has the disadvantage of being formed at an expensive price. This reason is constituted by the reason of the increase of the force and the connection of the planetary gear. In addition, since the case of planetary gear is composed integrally, the construction of internal gear requires high precision and high technology, and its material is the know-how of the producer, so it is very difficult to manufacture it in Korea, but it also depends on import. It is increasing the difficulty of construction companies in the unacceptable situation.

In view of the above-mentioned problems in the related art, an object of the present invention is to provide a motorized wrench control device in which a tightening torque is uniformly maintained in a predetermined state by a user in an electric wrench using a power of a motor and power of an output shaft. The purpose of this is to provide an electric wrench that is easy to manufacture by equally constructing a case that forms a wrench while forming a straight shape by interlocking with a planetary gear. This is a description.

1 is a circuit diagram showing the configuration of the electric wrench control apparatus according to the present invention.

Figure 2 is a front view showing the whole main sectional view of the electric wrench of the present invention.

3 is an exploded perspective view of the upper and lower cases in which the main gear of the present invention is formed.

* Explanation of symbols for main parts of the drawings

1: motor 2: operation switch

3,4 up-down button 5 display unit

6: tightening torque setting means 7, 8: microprocessor

9: current detection sensor 10: rectifier

11: comparator 12: photocutler

13: triac 14: standby power supply circuit

15: operating power supply circuit 16: phase detector

20: body 21: handle

30: reducer 31: upper and lower cases

32: internal gear 33: spool line

34: tightening nut 35: planetary gear

36: plate 37: sun gear

38: output shaft 40: socket

In order to achieve the above object, the present invention relates to a microprocessor for outputting an analog value by means of a tightening torque setting means, a tightening torque setting means, and the like, in which a motor and an operation switch are connected in series to a power supply. A comparator that compares and outputs a voltage value corresponding to the value of the microprocessor and the current flowing through the motor, and a microprocessor that controls the current flowing through the motor by the value of the comparator and the output of the phase detector. With the electric wrench control device which can adjust the tightening torque by installing the photo coupler between the switching means for controlling the current flowing through the rotor, the planetary gear is directly connected to the output shaft of the electric wrench and the wrench is formed in a straight line. Produces planetary gear by dividing gear case to form internal gear We propose an electric wrench with one feature to facilitate this.

By the above-described configuration, the present invention can make the tightening torque of the bolt or nut tightened by the electric wrench to a predetermined value. There are features that can be produced.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 illustrates a control apparatus of an electric wrench according to the present invention.

As can be seen from the above, the present invention is a known unit in which the motor 1 and the operation switch 2 are connected in series to a power supply, and the display unit for displaying the up-down buttons 3 and 4 and an operation state ( 5) a tightening torque setting means 6, a microprocessor 7 for outputting a corresponding analog value to the output port according to the operation of the tightening torque setting means 6,

The current detection sensor 9 installed on the power line of the motor 1, the rectifier 10 for converting the output of the current detection sensor 9 into a direct current voltage, the output voltage of the rectifier 10 and the microprocessor A comparator 11 adapted to apply the voltage at the output port of (7) to the inverted and non-inverted input terminals;

Microprocessor 8 for connecting the output of phase comparator 16 for sensing phase with the output of comparator 11 to the input terminal and for controlling the current flowing in motor 1 according to these signals And a photocoupler 12 comprising a light emitting diode and a phototransistor for generating an output voltage at a point in time designated by the output of the microprocessor 8, and a triac 13 having an output of the photocoupler 12 connected to a gate; Standby power supply circuit 14 directly connected to the power terminal for supplying power to the microprocessor 7, and operation for supplying power to other circuits by a transformer and rectifier circuit connected in series with the operation switch 2 It is composed of a power supply circuit (15),

2 is an overall front view of a main portion of the electric wrench of the present invention, and FIG. 3 is an exploded perspective view of the main portion of the present invention.

As can be seen in the known electric wrench consisting of the handle (2) and the body 20 and to link the reduction gear 30 to the electric motor output shaft of the body 20,

The reducer 30 is composed of each of the upper and lower cases 31 which are separated up and down, the inner gear surface of the inner gear 32 and the upper and lower cases 31 to form a spline 33 to the occlusal To fasten it,

The inner gears 32 of the upper and lower cases 31 are sequentially stacked by forming a planetary gear group interlocked with an integral sun gear 37 together with the rotation plate 36 hinged with the planetary gears 35. However, the sun gear of the planetary gear group of the upper side is composed of the output shaft 38 of the electric motor, and the reducer 30 constituted of the socket 40 in the final rotary full rate 36, and this socket 40 There is a configuration that can be used to connect the amplifier not shown.

When explaining the operation and effect of the operation state of the present invention as described above, the power is supplied to the microprocessor 7 via the standby power supply circuit 14 when the power cord is plugged in and the operation switch 2 is not operated. .

At this time, the microprocessor 7 indicates that the power is turned on by displaying an initial value with an indicator.

In this state, no other power is supplied to the other circuits, which means that they are in a working dash state.

At this time, when the user operates the up-down button (3, 4), the microprocessor (7) counts the number of presses to increase the number from 30 to 140 or decrease the number from 140 to 30 (kg-m), for example. In this case, the tightening torque can be set in detail in 110 steps.

When such a setting is performed, the microprocessor 7 generates a DC output voltage corresponding to the step set as an output port by the built-in program, and this output voltage is applied to the non-inverting terminal of the comparator 11. will be.

At this time, when the operator presses the operation switch 2, the power reaches the motor 1 and the triac 13 through the operation switch 2, but the triac 13 is turned off so that the motor 1 Is not working.

On the other hand, when the operation switch 2 is turned on, the operating power supply circuit 15 supplies a current to the transformer, and the rectified power is applied to each part of the circuit to start a normal operation. The DC voltage is applied to the non-inverting terminal of the phase detector 16 so that the phase detector 16 generates an output during the half-wave period of the rectifier circuit, which is a half-wave rectifier, and applies it to the input terminal of the microprocessor 8.

As described above, the comparator 11 receives the DC voltage specified by the microprocessor 7 and rectifies the output of the current detection sensor 9 for sensing the current flowing through the motor 1. At the same time, the output of the rectifier 10 applied to the inverting terminal is very low because there is no current flowing in the motor 1, and the output of the comparator 11 becomes a high level.

Therefore, since the microprocessor 8 meets the condition that the high level output signal of the comparator 11 is applied during the half-wave period of the phase detector 16, the microprocessor 8 gradually becomes wider at the output of the narrow pulse holding time. Output pulse of type.

This output pulse is applied to the photocoupler 12 and applied to the gate of the triac 13 as it is, so that the triac 13 is gradually turned on in a narrow state of turn-on holding time initially during the half wave period of the applied power. It is turned on with a wide range of time.

Accordingly, the current flowing in the motor 1 is gradually increased in the zero state, and thus the current supply is started in a stable state without damaging the motor 1 and the switching means due to the initial inrush current.

Accordingly, the motor 1 is supplied with normal power, and as the electric motor 1 in the body 20 composed of the handle 21 and the body 20 is rotated as shown in the cutout of the main part of FIG. 2. The output shaft 38 is rotated.

The output shaft 38 is a sun gear of the planetary gear group configured in the reduction gear 30 and interlocks the planetary gear 35, and the planetary gear 35 is in the case 31 by the inner gear 32 of the upper case 31. While rotating the planetary gear (35) hinged to rotate the rotating fullrate (36) and the sun gear 37 configured in the rotary fullrate (36) in conjunction with the second planetary gear group sequentially interlocking planetary gear group composed By decelerating and exerting torque, the socket 40 formed on the rotary full rate 36 of the last planetary gear group is driven.

As a result, the bolt or nut fastened to the socket 40 is rotated, and thus the tightened state is progressed.

In this way, while the tightening is made at the same time as the rotation of the socket 40 becomes difficult, a phenomenon occurs due to the overload that the current flowing in the motor 1 increases.

At this time, a voltage higher than before is induced in the current detection sensor 9, which is rectified by the rectifying unit 10 and applied to the inverting terminal of the comparator 11. This voltage is compared with the voltage supplied by the microprocessor 7. Will be.

In this state, when the tightening torque of the bolt or nut reaches the set level, the rotation of the socket 40 becomes more difficult to increase the current, and accordingly, the output voltage of the current detection sensor 9 is increased, so that the rectifier 10 The voltage applied to the inverting terminal of the comparator 11 through the () is higher than the output port voltage of the microprocessor 7 applied to the non-inverting terminal of the comparator 11.

Therefore, when the output voltage of the comparator 11 is inverted to a low level and the voltage is applied, the microprocessor 8 immediately stops supplying the pulse supplied to the photocoupler 12.

Therefore, the triac 13 is turned off, and thus, the rotation of the motor 1 is stopped so that the bolt or nut is tightened in the current state, and the set torque is tightened.

Therefore, in the present invention, it is possible to tighten the bolt or nut to the set accurate torque, it is possible to provide a stable fastening state at the time of fastening the beam and assembling the machine.

In addition, the present invention can at any time change the set torque by operating the up-down buttons (3, 4) while looking at the display unit 5, of course, when loosening the bolt or nut by changing the direction of rotation by the forward and reverse means The nut can be loosened.

As described above, the present invention can be tightened to the required torque by setting the rotational torque can be precisely assembled, and the tightening of the set torque is made, the work is made quickly.

In addition, it is easy to work in a narrow space because the structure of the body is formed as a date, and can be separated and manufactured by the upper and lower cases so that it can be mass-produced by low-priced producers. It can lead to many uses.

In this way, the present invention can adjust the tightening torque of the bolt or nut to the desired state to provide a stable fastening, assembling state to improve the safety and function of the product by precision assembly in the beam fastening or mechanical devices of various buildings The increase in durability can be obtained, and since the arbitrary adjustment can be made so as to be the optimal tightening torque from time to time, the use becomes more convenient.

Claims (2)

Tightening torque setting means (6) consisting of up-down buttons (3,4) and a display portion (5) displaying the operation state, in which the motor (1) and the operation switch (2) are connected in series to a power source. And a microprocessor 7 for outputting a corresponding analog value to the output port according to the operation of the tightening torque setting means 6, The current detection sensor 9 provided on the power line of the motor 1, the rectifier 10 for converting the output of the current detection sensor 9 into a DC voltage, the output voltage of the rectifier 10 and the microprocessor A comparator 11 adapted to apply the voltage of the output port of (7) to the inverted and non-inverted input terminals, A microprocessor for connecting the output of the phase detector 16 for sensing phase with the output of the comparator 11 to the input terminal and for controlling the power supplied to the motor 1 according to these signals ( 8), a photocoupler (12) consisting of a light emitting diode and a phototransistor for generating a draw voltage at a point in time designated by the output of the microprocessor (8), and a triac (with 13), a standby power supply circuit 14 directly connected to the power supply terminal for supplying power to the microprocessor 7, and a transformer and rectifier circuit connected in series with the operation switch 2 to supply power to other circuits. Control device capable of adjusting the tightening torque of the electric wrench, characterized in that the operating power supply circuit for supplying 15. In the well-known electric wrench consisting of the handle 21 and the body 20 and interlocking the reducer 30 to the electric motor output shaft of the body 20, the reducer 30 is divided into upper and lower respective upper and lower parts. Consists of the case 31, the inner gear 32 is formed on the inner circumferential surface and the upper and lower cases 31 to which the occlusion is formed by forming a spline 33 to the occlusal upper and lower cases 31 Fastening with a penetrating fastening nut 34, The inner gears 32 of the upper and lower cases 31 are sequentially stacked by forming a planetary gear group that is interlocked with an integral sun gear 37 together with the rotational full rate 36 hinged with the planetary gears 35. However, the sun gear of the planetary gear group of the upper side is configured as the output shaft 38 of the electric motor, and the tightening torque adjustment is composed of the reducer 30 consisting of the socket 40 in the final rotary pull rate (36). Electric wrench available.

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