JPH10118959A - Air hammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically sense a finish of driving of a workpiece so as to stop it by providing an air sensor detecting that a predetermined positional relationship is accomplished between a guide piece and a hammer piece and a switching valve shutting off the supply of compressed air to an air supply port on the basis of the detection output. SOLUTION: When an air hammer 1 is actuated, a workpiece W is driven into a hole HL by means of vibration of a hammer piece 12. Then, a tip part 133 approaches an object JT, and soon, touches the object JT. Subsequently, the tip part 133 is pressed by the object JT, and a guide piece 13 is moved in the axial direction against a compression coil spring 14. When the workpiece W is driven into the predetermined position, a packing 21 is brought close to a nozzle 191, and consequently, a back pressure inside a pilot tube 194 is increased. According to the increase of the back pressure, a switching valve 16 is switched, and supply of compression air to a driving body 11 is stopped, and as a result, an action of the driving body 11 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air hammer for driving various workpieces such as pins, steel balls, plugs, etc. into holes formed in an object.

[0002]

2. Description of the Related Art Conventionally, an air hammer has a driving body that vibrates when compressed air is supplied to an air supply port, and a hammer piece that vibrates in response to the vibration of the driving body. The work is pushed into the hole provided in the object by applying vibration or impact to the object.

An air hammer is usually provided with a lever for switching between operation and stop, and the air hammer operates while the lever is being pressed. When using the air hammer, the operator holds the air hammer by hand, and temporarily attaches a work (here, a steel ball) W to the tip of the hammer piece 81 as shown in FIG. The work W is applied to the entrance of the hole HL of the object JT, and the air hammer is manually pushed to press the work W against the hole HL of the object JT, and then the lever is pushed to operate the air hammer.

When the air hammer operates, the work W is driven into the hole by the vibration of the hammer piece 81. As shown in FIG. 7B, when the workpiece W is sufficiently driven into the hole HL, that is, when the driving of the workpiece W is completed, the operator returns the lever to stop the air hammer.

[0005]

In the conventional air hammer, in order to regulate the depth of driving of the work W, when the work W is driven to a predetermined position as shown in FIG. The tip portion 81a of the hammer piece 81 directly hits the object JT.

Then, the driving body and the hammer piece 8
The vibration 1 directly returns as a reaction to the operator's hand, and the vibration or impact is directly applied to the operator's hand and body. However, in the conventional air hammer, it is necessary for the operator to sense that the driving of the workpiece W has been completed and return the lever, so that a time delay occurs before returning the lever. Therefore, for a while after the driving of the workpiece W is completed, vibration or impact is directly applied to the hand and body of the worker. Such vibrations or shocks have an adverse effect on the worker's body.

Further, the tip portion 81a of the hammer piece 81
When the object directly hits the object JT, a large noise is generated, so that there is room for a problem of noise pollution. The present invention has been made in view of the above-described problem, and automatically detects the completion of driving of a workpiece and stops the air hammer, thereby eliminating vibration or impact applied to the worker's body. Or to minimize it.

[0008]

According to a first aspect of the present invention, there is provided an air hammer comprising: a driving body that vibrates when compressed air is supplied to an air supply port; An air hammer configured to push the work into a hole provided in an object by applying vibration to the work by the hammer piece, and to be parallel to an axis of the hammer piece. A guide piece provided so as to be movable in any direction and a tip end portion provided so as to be able to contact the object, and attaching the guide piece in a direction toward the object between the guide piece and the driving body. The guide member and the hammer piece are brought into a predetermined positional relationship by an axial movement of the guide member and the spring member provided to urge the guide member. An air sensor for detecting that the air supply port is connected between the air supply port and the compressed air source of the driving body, and the supply of the compressed air to the air supply port is shut off by a detection output of the air sensor. And a switching valve that can be switched to

In the air hammer according to the second aspect of the present invention, the air sensor includes a nozzle provided on the guide piece and connected to discharge compressed air, and an air sensor connected to an outlet of the nozzle. A shielding member provided on the hammer piece, for increasing the back pressure of the compressed air exhausted from the nozzle by approaching the outlet of the nozzle when the guide piece and the hammer piece have a predetermined positional relationship. , Consisting of

[0010] In the air hammer according to the third aspect of the present invention, the shielding member is made of synthetic rubber. When the work is driven into the hole to a predetermined position, the work is detected by the air sensor. The switching valve is switched by the detection of the air sensor, and the supply of the compressed air to the driving body is stopped, whereby the operation is stopped.

[0011]

FIG. 1 is a front view showing a schematic structure of an air hammer 1 according to the present invention, FIG. 2 is an enlarged view showing a main part of the air hammer 1, and FIG. 3 is a left side view of FIG. FIG. 4 is a left side view showing the position of the guide piece 13 when the driving of the workpiece W is completed, and FIG. 5 is an air circuit diagram of the air hammer 1.

Referring to FIG. 1, an air hammer 1 includes a driving body 11, a hammer piece 12, a guide piece 13, a compression coil spring 14, a tee 15, a switching valve 16, throttle valves 17, 18, an air sensor 19, and the like. I have.

The driving body 11 is a known one that vibrates when compressed air is supplied. The driving body 11 is provided with a lever 111. The driving body 11 is operated by pressing the lever 111, and the driving body 11 is stopped by returning the lever 111. Such a driving body 11
For example, a riveting hammer RRH series manufactured by Atlas Copco is used.

A ring member 113 is attached to the driving body 11 by screws 114. Ring member 113
, Two guide rods 115, 115 are attached in parallel with each other.

The hammer piece 12, which is an accessory of the driving body 11, vibrates in response to the vibration of the driving body 11. The tip of the vibrating hammer piece 12 hits the work W, thereby giving an impact or vibration to the work W, thereby driving the work W into the hole HL. Therefore, the tip of the hammer piece 12 has an appropriate shape according to the type and shape of the work W so that the work W can be grasped at the center thereof or the impact can be applied to the work W efficiently. ing. Work W in the present embodiment
Is a cylindrical pin.

Referring also to FIGS. 2 and 3, the hammer piece 12 includes an insertion portion 121, a body portion 122, and a head portion 123.
Consists of The insertion portion 121 has a horn-shaped portion, and is inserted into a hole provided at a distal end portion of the driving body 11. After the driver 11 is inserted, the body 12
A spiral spring 112 is mounted between the drive member 2 and the driving body 11, and is urged toward the back so that the hammer piece 12 does not come off. The head 123 is a work W
Is a columnar shape having substantially the same diameter as At the base of the head 123, a packing 2 as a shielding member in the present invention is provided.
1 is mounted in such a tension state that it does not move on its own due to vibration or the like.

The guide piece 13 includes the hammer piece 12
Part 132, which can slide in the axial direction by sliding on the outer peripheral surface of the head part 123, the guide part 13 formed integrally with the cylindrical part 132
1 and a part of the screw 13
4 comprises a tip 133 which is prevented from falling off.

The guide portion 131 is provided with two guide holes, and the guide holes are provided in the guide holes.
The guide pieces 13 are slidable along the guide rods 115. One end of each guide rod 115 has a ring 1
16 and 116 are attached, whereby the axially movable end of the guide portion 131 is regulated. Note that the other end of each guide rod 115 is fixed to the ring member 113 by being inserted into a hole provided in the ring member 113 and then attached and caulked with the ring 117.

The guide portion 131 has a nozzle 191 opening to the end surface 135 and a port 1 communicating with the nozzle 191.
92 are provided, and the port 192 has a nipple 193
The pilot tube 194 is connected.

The tip 133 has an inner peripheral surface that also serves as a guide for the work W, and the tip of the tip 133 contacts the object JT. The compression coil spring 14 is mounted between the guide portion 131 of the guide piece 13 and the ring member 113 of the driving body 11, and urges the guide piece 13 in a direction toward the object JT. Therefore, in the normal state, the guide piece 13 is in a state in which the outer end surface of the guide portion 131 is in contact with the ring 116, that is, at the position closest to the work W. When pushed by the JT, the guide piece 13 moves along the guide rod 115 against the urging force of the compression coil spring 14.

The guide portion 131 and the guide rod 1
15 is attached to the ring member 113 with the screw 1
19, 119. Cover 118
Is provided with a notch 118 a for preventing interference with the nipple 193 due to movement of the guide portion 131.

The packing 21 has a ring shape made of synthetic rubber and has a rectangular cross section. Work W is object J
When the guide piece 13 is moved by being pushed into the hole HL of the T by the object JT by the tip portion of the tip portion 133, when the workpiece W is driven to a predetermined position as shown in FIG. End surface 135 of piece 13
Abuts against the packing 21, whereby the nozzle 191 is closed by the packing 21.

When the compressed air is supplied by the pilot tube 194, the compressed air is initially exhausted from the open end of the nozzle 191. Therefore, the pressure (back pressure) of the compressed air in the pilot tube 194 decreases. However, when the workpiece W is driven into a predetermined position and the nozzle 191 is closed by the packing 21, the nozzle 1
The discharge of the compressed air from the pump 91 is stopped, and the pressure (back pressure) in the pilot tube 194 rises.
That is, thereby, the axial position of the guide piece 13 with respect to the hammer piece 12, that is, the end position of the driving of the workpiece W is detected.

The nozzle 191, the pilot tube 194 for supplying compressed air to the nozzle 191, and the packing 21
Thus, the air sensor 19 is configured. In addition,
Theoretically, when the packing 21 approaches the distance of a quarter of the diameter of the nozzle 191, the back pressure starts to rise. Therefore, even if the packing 21 does not contact the nozzle 191, the packing 2
When the nozzle 1 comes very close to the nozzle 191, detection by the air sensor 19 is possible.

Referring to FIG. 1 and FIG.
An air hose from a compressed air source PS is connected to one connection port 151 by a nipple or a coupler. The other connection port 152 of the tee 15 is connected to an input port of the switching valve 16 via a nipple. Tea 15
The throttle valve 18 is connected to the other one connection port 153.

The switching valve 16 is connected between the air supply port 11a of the driving body 11 and the compressed air source PS. The pilot port 161 of the switching valve 16 is connected to the compressed air source PS via the throttle valve 18 and to the pilot tube 194. Switching valve 16
Normally supplies compressed air from the compressed air source PS to the driving body 1.
However, when the pressure of the pilot port 161 increases due to the detection output (back pressure increase) of the air sensor 19, the supply is switched to shut off the supply of the compressed air to the air supply port 11a.

The throttle valve 17 is for adjusting the flow rate of the compressed air to the driving body 11. The throttle valve 18 adjusts the flow rate of the compressed air to the pilot tube 194 so that the air sensor 19 operates properly.

Next, how to use and operate the air hammer 1 will be described. As shown in FIG.
Insert the work W into the hole of, hold the driver 11 by hand,
As shown in FIG. 2, the workpiece W is applied to the entrance of the hole HL of the object JT. While the work W is pressed against the hole HL of the object JT by pressing the air hammer 1, the lever 111 is pressed to operate the air hammer 1.

When the air hammer 1 operates, the work W is driven into the hole HL by the vibration of the hammer piece 12. As the driving of the workpiece W proceeds, the tip 133 approaches the object JT, and eventually comes into contact with the object JT. After the tip 133 contacts the object JT, the tip 1
33 is pushed by the object JT, and the guide piece 13 moves in the axial direction against the compression coil spring 14.

When the workpiece W is driven to a predetermined position, the packing 21 approaches the nozzle 191 and the back pressure in the pilot tube 194 rises. The switching valve 16 is switched by the rise of the back pressure, the supply of the compressed air to the driving body 11 is stopped, and the operation of the driving body 11 is stopped.

As described above, according to the air hammer 1 of this embodiment, when the driving of the workpiece W is completed, the completion of the driving is detected by the air sensor 19 at that time, and the supply of the compressed air to the driving body 11 is automatically performed. Will be suspended.

Therefore, unlike the conventional air hammer, it is not necessary to directly contact the tip with the object JT in order to regulate the depth of the workpiece, and vibration or impact is directly applied to the worker's body. Nothing. Also,
There is no loud noise. Thus, according to the air hammer 1, the vibration or impact applied to the worker's body is minimized. In addition, since vibration or impact is not directly applied to the object JT by the tip 133, there is no possibility that the object JT is damaged by the tip 133. Since the air hammer 1 stops immediately after the driving of the workpiece W is completed, there is no waste of air.

Further, since the distal end 133 is detachably attached, when the distal end 133 is worn, it can be easily replaced. Since the work W can be easily held by the tip 133, the work is easy. Since the packing 21 made of synthetic rubber is used as the shielding member, the packing 21 has appropriate elasticity, can easily block the nozzle 191, and the detection is reliable.

FIG. 6 is a diagram showing a main part of the air hammer 1A when a steel ball is used as the work W.
In the air hammer 1A shown in FIG. 6, a tapered recess for capturing the center of the work W is formed at the tip of the head 124 of the hammer piece 12A. Further, a claw member 136 is provided at the tip end of the guide piece 13A for gripping the work W. The claw member 136 is
The compression spring 13 is rotatable around the pin 137.
8, the workpiece W is urged in the direction of gripping the workpiece W.

In the air hammer 1A as well, when the workpiece W is driven to a predetermined position, the packing 21 approaches the nozzle 191 to increase the back pressure in the pilot tube 194, and the operation of the air hammer 1A is automatically stopped. Let it.

In the above embodiment, the switching valve 16
Alternatively, various other switching valves such as a three-way switching valve and a four-way switching valve can be used. Air sensor 1
9, a pressure sensor for detecting the back pressure is attached, and the output signal of the pressure sensor can be used for control or management. For example, by counting the output signal of the pressure sensor, it is possible to manage the number of driven workpieces W, confirm that there is no missed driving, and manage the number of driven workpieces per day. Further, when the air hammer 1 is used as a part of an automatic machine, the air hammer 1 can be used for controlling the automatic machine such as shifting to the next sequence by the output signal of the pressure sensor. Packing 2
The first material may be a synthetic resin or a metal such as a body. Instead of the packing 21, another suitable member can be used. The packing 21 may be omitted, and the hammer piece 12 itself may be used also as a shielding member. The shape, dimensions, and the like of the hammer piece 12 can be variously changed according to the type of the work W and the like. The method of connecting the compressed air piping can be variously changed. For example, the pilot tube 194 may pass through the inside of the driving body 11. The switching valve 16 and the like may be built in the driving body 11. The switching valve 16 can also be used as the lever 111. The structure, shape, dimensions of the guide piece 13, and the structure, shape, dimensions, material, air circuit, etc. of the entire or each part of the air hammer 1 can be appropriately changed in accordance with the gist of the present invention.

[0037]

According to the first to third aspects of the present invention,
When the driving of the work is completed, the air hammer is automatically detected and stopped, so that vibration or impact applied to the body of the operator can be minimized. As soon as the driving of the workpiece is completed, the air hammer stops, so there is no waste of air.

According to the third aspect of the present invention, the nozzle can be easily closed, and the detection is reliable.

[Brief description of the drawings]

FIG. 1 is a front view showing a schematic structure of an air hammer according to the present invention.

FIG. 2 is an enlarged view showing a main part of the air hammer.

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a left side view showing the position of the guide piece when the driving of the workpiece is completed.

FIG. 5 is an air circuit diagram of the air hammer.

FIG. 6 is a diagram showing a main part of an air hammer when a steel ball is used as a work.

FIG. 7 is a view showing a driving state of a conventional air hammer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air hammer 11 Driver 12 and 12A Hammer piece 13, 13A Guide piece 14 Compression coil spring (spring member) 16 Switching valve 19 Air sensor 21 Packing (shielding member) 191 Nozzle W Work JT Object HL Hole

Claims (3)

[Claims] A driving member that vibrates when compressed air is supplied to an air supply port; and a hammer piece that vibrates in an axial direction by receiving vibration of the driving member. An air hammer configured to push the work into a hole provided in the object by pressing while providing the object, wherein the air hammer is provided so as to be movable in a direction parallel to an axis of the hammer piece, and a tip portion is attached to the object. A guide piece provided so as to be able to abut, a spring member provided between the guide piece and the driving body to urge the guide piece in a direction toward the object, An air sensor for detecting that the guide piece and the hammer piece are in a predetermined positional relationship by the axial movement; and A switching valve that is connected between the air supply port and the compressed air source, and that is switched to shut off the supply of the compressed air to the air supply port by a detection output of the air sensor. The characteristic air hammer. 2. A nozzle provided on the guide piece and connected to discharge compressed air, the air sensor is provided on the hammer piece so as to face an outlet of the nozzle. And a shielding member for increasing a back pressure of compressed air exhausted from the nozzle by approaching the outlet of the nozzle when the hammer piece has a predetermined positional relationship. 1. The air hammer according to 1. 3. The shielding member is made of synthetic rubber.
The described air hammer.