JP3101903U - Air valve structure of compressed air motor in screw tightening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air valve structure of a compressed air motor in a screw tightening machine capable of reducing the volume of the screw tightening machine and improving smoothness when sending high-pressure air to the compressed air motor.
[Solution]
The axis of the compressed air motor of the screwdriver is formed with a two-way rod storage groove. One end of the rod storage groove communicates with the air intake of the compressed air motor, and the other end is formed with the opening and closing of the valve, and the opening and closing of the valve supplies the air that drives the compressed air motor To the air supply port in the screwdriver so as to form an air passage for the screw. A piston rod for driving a screw nail is installed in a storage groove of the rod. A washer for stopping air is formed on the piston rod.
[Selection] Figure 2

Description

    The present invention relates to a screwdriver, and more particularly, to an air valve structure of a compressed air motor in the screwdriver. In a compressed air motor, the air passage is formed between the compressed air intake and the air supply to the screwdriver. A piston rod is also used to turn the screw nail into the work piece.

The pneumatic screwdriver operates with high pressure air and drives a piston rod in a cylinder to generate a linear driving force, and also turns a compressed air motor in the screwdriver. Such a driving force is transmitted to the bar for fixing the screw nail, and the screw nail is driven into the work piece.
Generally, prior art screwdrivers have a cylinder. The application of pistons and compressed air motors is also known in the prior art. In the prior art, the compressed air motor was usually located above the cylinder and piston rod and was isolated from the piston rod. In addition, a curved air passage was formed in the vertical wall at the end of the air intake of the compressed air motor, leading to an air valve at the lower end of the cylinder wall. The linear reciprocation of the piston rod controls the opening and closing of the air passage of the motor, and drives the piston rod so that the piston rod moves the screw nail in the linear direction and the rotation direction.

  However, in the above-mentioned prior art, the shaft of the motor is a solid shaft and only has a function of transmitting the rotational force. Furthermore, the curved air passage formed on the vertical wall at the end of the air intake of the compressed air motor has a large curvature. This is not suitable for reducing the volume of the screwdriver, nor for the smoothness of sending high pressure air to the compressed air motor. In the prior art, these disadvantages are evident.

The main purpose of this invention is to provide a pneumatic valve for a compressed air motor in a screwdriver where there is an air passage in the motor shaft leading between the air intake of the compressed air motor and the air supply to the screwdriver. Is to provide a structure.
Another purpose of this invention is to open and close the motor air passage so that the space for installing the compressed air motor air valve in the air passage of the compressed air motor is reduced. It is to provide a pneumatic valve structure of a compressed air motor in a screwdriver, such as formed as a valve rod.
It is a further object of this invention to provide a compressed air motor air valve structure in a screw press, wherein the air intake passage opens into the compressed air motor air intake.

In this invention, the shaft of the compressed air motor is formed with a two-way rod storage groove. One end of the storage groove of the rod communicates with the air intake of the compressed air motor, and the other end is formed with the opening and closing of the valve, the opening and closing of the valve supplies the air that drives the compressed air motor To an air supply port in the screwdriver so as to form an air passage for the screw. A piston rod for driving a screw nail is installed in a storage groove of the rod. A washer for stopping air is formed on the piston rod. The purpose is to control the opening and closing of the valve opening and closing together with the movement of the screw, and to drive the screw to control the opening and closing of the valve opening and closing. In this way, the rotation of the compressed air motor is controlled.
The air valve structure of the compressed air motor in the screwdriver according to claim 1, wherein a shaft of the compressed air motor is provided between the upper bearing and the lower bearing, and the compressed air motor is provided on the upper bearing and the lower bearing, respectively. An air intake for driving the rotation of the compressed air motor is provided, and the axis of the compressed air motor is formed with a storage groove of the bidirectional rod, and one end of the storage groove of the rod is connected to the air intake of the compressed air motor. The other end is formed with an opening and closing port of a valve, and the opening and closing port of the valve is formed in a screw driving machine so as to form an air passage for supplying air for driving a compressed air motor. A piston rod for driving a screw nail is installed in the storage groove of the rod, and a washer is formed on the piston rod to stop air. There are, by controlling the opening and closing of the closure of the valve with the movement of the screw nail, characterized by being adapted to control the rotation of the compressed air motor.
Further, in the air valve structure of the compressed air motor in the screw tightening machine according to the second aspect, in the first aspect, the air intake of the compressed air motor has an annular washer at an upper end of an upper bearing, and the annular washer is provided. Has a groove extending from the inner hole of the annular washer to the outside, and communicates with the storage groove of the rod and the air intake of the compressed air motor.
Further, the air valve structure of the compressed air motor in the screw tightening machine according to claim 3 is characterized in that in claim 1, the opening and closing opening of the valve has a shape like a neck and a smaller inside diameter. And

  With the valve structure and the air passage according to the present invention, the air passage is shorter and located at the structural center line of the screwdriver. Therefore, favorable stability is maintained. Also, when the upper valve that opens the main air valve is opened, there is an effect that high-pressure air is smoothly supplied to the air passage of the compressed air motor.

  To better understand this invention, it is described in detail below. However, this text and the drawings are for understanding the purpose, features, properties, and the like of this invention, and do not define the scope and spirit of the invention described in the claims for utility model registration.

  FIG. 1 is a perspective view of a compressed air screwdriver according to the present invention. The screw tightening machine mainly includes a head 11 and a handle 12 which constitute the screw tightening machine main body 1. At the lower end of the screwdriver body 1, a screw nail driver 13 for pressing the screw nail at a position where the screw nail is driven and turning the screw nail is installed. A trigger 15 is provided at the bottom of the main body of the screw tightening machine. In order to screw the screw nail in the screw tightener body into the work piece, the trigger may be pulled.

FIG. 2 shows the inside and operation mechanism of the compressed air screwdriver according to the present invention. The structure consists of the following elements.
The compressed air motor 2 has a shaft 20 on the central axis of the motor, and the compressed air motor 2 is installed between an upper bearing 21 and a lower bearing 22. A plurality of radially arranged blade-like grooves 23 are formed in the compressed air motor 2 to receive the plurality of blades 24. The blades operate in a housing 25 eccentric with high pressure air to drive the shaft 20.

An air intake 29 is formed in the upper bearing 21 and the lower bearing 22, and communicates with the blade-shaped groove 23. The upper bearing 21 has a washer 55. Washer 55 has at least one grooved portion 56 extending from interior space 57. The groove portion 56 communicates with the air intake 29 so as to form a motor air intake passage.

  A rod storage groove 26 is formed in the motor shaft 20. One end of the storage groove 26 of the rod communicates with the air intake passage of the compressed air motor 2, and the other end is formed with a neck-like valve opening 28 having a smaller inner diameter, which is provided in the screwdriver body. It leads to an air supply (described later). In this way, a passage for guiding the high-pressure air for driving the compressed air motor 2 is formed.

  A drive gear 31 is connected to the planetary gear set 3. The drive gear 31 is driven by the shaft 20, and drives a plurality of driven gears 33 and the inner gear 32 around the drive gear 31.

  The driven gear 33 rotates the power output plate 4 on the bearing sheet 5. A polygonal space 41 is formed on the central axis of the power output plate 4, and the polygonal piston rod 6 is installed so as to penetrate the polygonal space 41 along the central axis of the power output plate 4. . The bush 42 is engaged with the polygonal space 41, and the piston rod 6 is surrounded by the bush 42. A plurality of disc holes 40 may be formed on the power output plate 4 to communicate with the valve openings 28 of the rod storage grooves 26.

  A plurality of sheet holes 50 are formed on the bearing sheet 5. The hole 50 in the seat communicates with the storage groove 26 of the rod and the valve opening 28. The lower end of the bearing sheet 5 is formed together with the cylinder 7. The outer wall of the cylinder 7 is formed with an insulating ring 70. The main air valve 8 and the main air valve opening / closing port 80 are mounted between the bearing seat 5 and the cylinder 7. The main air valve opening / closing port 80 has an upper valve opening 82 and a lower valve opening 83. The lower end of the main air valve 8 is supported by a spring 81.

  The polygonal wall of the piston rod 6 is driven and rotated by being engaged with the power output plate 4. Further, the piston rod 6 penetrates through a valve opening 28 which is hidden in a groove 26 for accommodating the rod of the motor shaft 20. As described above, the rod storage groove 26 functions to receive the piston rod 6 in addition to functioning as a central passage of the air flowing through the air passage of the motor.

  Below the piston rod 6 is a piston valve 60, which is installed so as to be movable in the cylinder 7. The lower part of the piston rod 6 is fastened to a rod 61 for fixing a screw nail. Further, an annular groove 62 is provided on the upper part of the piston rod 6. Inside the annular groove 62 is an air stop washer 63, which is formed as a valve rod for controlling the opening and closing of the valve opening 28 shaped like a neck in the air passage of the motor.

  Further, in the present invention, the air supply passage leading to the valve opening 28 of the rod storage groove 26 has a disc hole 40 on the power output plate 4, a seat hole 50 of the bearing sheet 5, and a main air valve opening / closing port 80. It is formed by the upper valve opening 82 and the like.

  When the trigger 15 is not triggered (see FIG. 3), the upper valve opening of the main air valve opening / closing port 80 is closed. The high-pressure air 90 in the upper air reservoir 91 cannot flow into the upper valve opening 82. Therefore, the compressed air motor 2 cannot rotate. At this time, the lower valve opening 83 of the main air valve opening / closing port 80 is open. The air above the piston valve 60 is discharged, and the piston rod 6 returns upward and is hidden in the rod storage groove 26.

  When the trigger 15 is pulled (see FIG. 4), the trigger valve 16 is opened, and the air discharge passage from the air passage 17 of the trigger to the outside is opened. Then, the high-pressure air 90 in the air passage 92 of the intermediate layer is discharged. Then, the high-pressure air is continuously supplied to the air reservoir 91 above the main air valve 8. As a result, the introduced air pressure becomes greater than the pressure from the spring 81 in the air passage 92 of the intermediate layer, opening the upper valve opening 82 and closing the lower valve opening 83. High pressure air 90 enters cylinder 7 through upper valve opening 82 and pushes piston valve 60. Accordingly, the piston rod 6 moves linearly, and operates to rapidly lower the rod 61 for fixing the screw nail. Further, the high pressure air 90 enters the disc hole 40 and the seat hole 50 through the valve opening 28, and enters the rod storage groove 26 which is the air passage of the motor. Then, in the air passage of the motor, the flow of air to the inner space 57, the groove portion 56, the air intake 29, etc. drives the shaft 20 of the compressed air motor 2 to generate a rotating force, and the planetary gear The set 3 is driven to rotate the power output plate 4. Thus, the descending piston rod 6 is rotationally driven, and the rod 61 for fixing the screw nail is rotated to rotate the screw nail.

  As the piston rod 6 descends to its lowest point (see FIG. 6), the cylindrical body and the high pressure air 90 at the top of the piston valve 60 are returned to the air reservoir 95 through an inlet 71 near the bottom of the cylinder 7. . At this time, the screw nail is embedded, the air stop washer 63 above the piston rod 6 descends, closes the valve opening 28, shuts off the air supply passage and the motor air intake, The compressed air motor 2 stops.

  Next, when the trigger 15 is released, the trigger valve 16 is also released (see FIG. 7), and the air discharge passage from the air passage 17 of the trigger to the outside is closed. The high pressure air 90 in the handle 12 passes through the trigger air passage 17 and into the middle layer air passage 92 to apply pressure. Due to the elastic force of the spring 81, the main air valve opening / closing port 80 of the main air valve 8 returns, the upper valve opening 82 closes, and shuts off air from flowing into the valve opening 28 and the air stop washer 63. Further, the lower valve opening 83 is opened to discharge air to the cylinder 7. In this manner, the high-pressure air 90 stored in the air reservoir 95 is guided from the outlet hole 72 to the cylinder 7 at the bottom of the piston valve 60, and pushes up the piston rod 6. It is hidden inside. (See Fig. 3)

Although the device described herein shows a preferred specific example, it is not limited to the content described therein. Various substitutions and modifications not described herein can be inferred by the ordinary knowledge of those skilled in the art, and they are included in the claims of the present invention.

FIG. 4 is a perspective view of the screw tightening machine according to the present invention. FIG. 3 is a schematic view of a head portion of the screw tightening machine according to the present invention. FIG. 4 is a sectional view showing a state before the trigger is pressed according to the present invention. FIG. 4 is a cross-sectional view showing an initial state when a trigger is pressed according to the present invention. It is sectional drawing which shows the state before pushing a trigger and moving a piston rod forward. It is sectional drawing which shows the state before pushing a trigger and moving a piston rod forward and reaching a final position. It is sectional drawing which shows the state in which the trigger was released and the piston rod returned.

Explanation of reference numerals

1 Screwdriver body 2 Compressed air motor shaft
Upper bearing
22 Lower bearing
26 Rod storage groove
28 Valve opening
29 air intake
55 washer
63 Air stop washer main air valve opening / closing port

Claims (3)

  A shaft of a compressed air motor is provided between the upper bearing and the lower bearing, and the upper bearing and the lower bearing each have an air intake for driving the rotation of the compressed air motor, and the compressed air The shaft of the motor is formed with the two-way rod storage groove, one end of the rod storage groove communicates with the air intake of the compressed air motor, and the other end is formed with the valve opening and closing, The opening and closing port of the valve communicates with the air supply port in the screw tightener so as to form an air passage for supplying air for driving the compressed air motor, and a piston rod for driving a screw nail is provided. A washer is installed in the storage groove of the rod, and a washer that stops air is formed on the piston rod, and controls the opening and closing of the valve opening and closing together with the movement of the screw nail, and the compressed air mode Air valve structure of the compressed air motor in the screw tightening machine is characterized in that so as to control the rotation of the over.   The air intake of the compressed air motor has an annular washer at the upper end of the upper bearing, and the annular washer has a groove extending from the inner hole of the annular washer to the outside. The air valve structure of a compressed air motor in a screwdriver according to claim 1, wherein the air valve communicates with an air intake of the motor.   The air valve structure of a compressed air motor in a screwdriver according to claim 1, wherein the opening and closing opening of the valve has a shape like a neck and has a smaller inner diameter.

Images