JPH0619078Y2 - Automatic hammer lifting device in impact tester - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (Industrial Application Field) This invention relates to an automatic hammer lifting device in an impact tester.

(Prior Art) Conventionally, a return position of a hammer is visually confirmed, a switch is turned on to excite an electromagnetic clutch, and a lifting drive device and a hammer shaft are connected to lift a hammer to a predetermined position.

(Problems to be solved by the invention) Visually, it is very difficult to switch on properly at the upper limit of the swing-back angle of the hammer, and it is easy to reach the upper limit before and after reaching the upper limit. In the case before reaching, the hammer has not used up the swing-back energy, and in the case after reaching, the hammer has already stored the energy to swing down again, so in any case, the clutch overcomes that energy and the clutch drives with the hammer shaft to lift. The device must be connected. Therefore, the impact force that acts on the machine at the time of connection is great, and it may cause the machine to malfunction or be damaged. Furthermore, the lifting time is longer than the upper limit of the swing back, and the test cycle must be long.

(B) Configuration of the device (Means for solving the problem) The present invention relates to a rotary hammer-type impact tester, in which a hammer is separated from the gripping device and dropped and rocked, and the swing angle after passing through the lowest point and When this hammer is reversed, the angle sensor for detecting both angles of the swing-back angle after passing the lowest point and the swing-up angle detected by this angle sensor are stored, and the swing-back angle detected by this angle sensor is The present invention is characterized by including a memory / instruction device that sends a command for connecting the hammer shaft and the lifting drive device to the gripping device when the swing angle becomes substantially equal.

(Operation) When the hammer is gripped and separated from the device, it falls and swings due to its own weight, and the test piece is cut at the lowest point and shaken up. Then, when it swings up a certain angle, it flips over again and swings back through the lowest point to the other side. It is known that the swing-up angle and the swing-back angle are almost equal. This swing-up angle is detected by the angle sensor and stored by the storage / instruction device. On the other hand, the swing-back angle is also detected by this angle sensor, and when this angle becomes substantially equal to the swing-up angle stored in the memory, a signal is output, and this is sent to the gripping device to be activated. By this activation, the lifting drive device and the hammer shaft are connected via the gripping device, and the hammer is immediately lifted to reach the desired position and prepares for the next drop.

(Example) 1 is a hammer, 2 is its arm, 3 is an axis, and the hammer 1 is of a type that is lifted up to a point of a lifting angle α and falls and swings from there to break a test piece T. An angle sensor 4 is installed on the shaft 3, and the hammer 1 is reversed from the swing angle β after passing through the lowest point U when the hammer 1 is separated from the gripping device 5 such as a clutch and falls and swings. Then, both angles of the swing-back angle β ′ after passing through the lowest point U are detected. Reference numeral 6 denotes a memory / instruction device that stores the swing-up angle β detected by the angle sensor 4 and lifts the hammer shaft 3 and the hammer shaft 3 when it is determined that the swing-back angle β ′ substantially matches the swing-up angle β. A command for connecting the driving device 7 is sent to the gripping device 5 to connect them. Here, the lifting drive device 7 lifts the hammer 1 until the lifting angle α is reached.

If the gripping device 5 is composed of the gripping part 21 and the operating device part 22 of this gripping part, a signal from the memory / instruction device 6 can be sent to the operating device part 22, and the gripping part 21
Can be configured to suit the purpose of connection.

In the drawing, 31 is an angle display plate.

In the case of use, the hammer 1 at the position of the lifting angle α is lifted and separated from the driving device 7. Then, the hammer 1 falls and swings due to its own weight, cuts the test piece T at the lowest point U, and swings up,
It stops at the position of the predetermined swing-up angle β. The angle β is detected by the angle sensor 4 and stored in the storage / instruction device 6. Here, the hammer 1 enters the reversal and swings back to the opposite side through the lowest point U again. Then, it stops at the point of the predetermined swing-back angle β '. The swing-back angle β ′ is also detected by the angle sensor 4, and the information is sent to the storage / instruction device 6. When the memory / instruction device 6 determines that both angles β and β ′ are almost equal, the device 6 sends a signal to the gripping device 5 to connect the shaft 3 and the lifting drive device 7. Therefore, the hammer 1 is lifted to a position where the lifting angle α is reached. When the gripping device is separated, the hammer 1 drops and swings again, and another test piece is cut to perform the test.

C. Effect of the device According to the present invention, the hammer can be caught at the maximum angle of swing-back, so that the lifting time of the hammer up to the lifting angle can be minimized to shorten the test cycle and the impact force acting on the machine It can be made small and its service life can be extended.

[Brief description of drawings]

The drawings are perspective views showing a specific example of the automatic hammer lifting device according to the present invention. 1 ... Hammer, 2 ... Arm, 3 ... Axis, α ... Lifting angle, T ... Test piece, 4 ... Angle sensor, 5 ... Gripping device, U ... Bottom point, β ... Vibration Lifting angle, β '... Swing-back angle, 6 ... Memory / instruction device, 7 ... Lifting drive device, 21 ... Grasping part, 22 ... Actuating device.

Claims (2)

[Scope of utility model registration request] 1. A rotary hammer-type impact tester, wherein the swing angle after passing the lowest point when the hammer is separated from the gripping device and falls and swings, and the lowest point when the hammer is reversed. The angle sensor for detecting both angles of the subsequent swing-back angle and the swing-up angle detected by this angle sensor are stored, and when the swing-back angle detected by this angle sensor becomes almost equal to the swing-up angle, the hammer An automatic hammer lifting device in an impact tester, comprising a memory / instruction device for sending a command for connecting a shaft and a lifting drive device to a gripping device. 2. The utility model registration claim, wherein the gripping device comprises a gripping part and an operating device part for the gripping part, and a command from the storage and instruction device is given to the operating device part. An automatic hammer lifting device in the impact tester described in (1).