JPH07216693A - Device for preventing oscillation of loom - Google Patents

Abstract

PURPOSE:To efficiently attenuate the oscillation of a stand by adding the oscillation of the opposite phase to the oscillation of the stand accompanied by the operation of a loom. CONSTITUTION:An oscillation-absorbing member 5 comprising an oscillation- absorbing rubber, etc., having a relatively large cross section, exhibiting an oscillation-absorbing action and supporting the weights of the loom main body 1 and a stand 2 is disposed between the floor surface 4 and the stand 2 used for loading and fixing the loom main body 1. Oscillation-adding devices 6 are disposed at the four corners of the stand 2, and the oscillation-absorbing member 5 and the oscillation-adding devices 6 are connected with dampers 7 such as active fluid-damping mounts, respectively. An oscillation generated from the loom main body 1 is detected with oscillation sensors 3 disposed on the stand 2, and the opposite phase oscillation is outputted from the oscillation-adding devices 6 on the basis of the oscillation signal to attenuate the oscillation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a loom.

[0002]

2. Description of the Related Art As a conventional vibration damping device for such a loom, for example, there is one as shown in FIG.
(See Japanese Patent No. 370246). That is, a vibration sensor 102 that outputs a vibration signal corresponding to the vibration generated by the loom 101 is installed, and the vibration signal is compared with a reference signal that is the maximum allowable level of the amplitude of vibration, and the vibration of the loom 101 has a reference value. When it exceeds, the amount of the filler 106 such as sand and oil water filling the space 105 in the beam 104 connecting the left and right main body frames 103 and the internal pressure of the space 105 are adjusted to suppress the vibration of the loom. Further, a vibration isolator for a loom is also known, in which a vibration exciter is provided between the loom and the floor to vibrate in a phase opposite to the phase of the vibration signal of the vibration sensor to actively damp the vibration. .

[0003]

However, in such a conventional vibration damping device for a loom, the vibration damping device is provided at each vibration generating portion of the loom, so that the inside of the loom becomes complicated and the entire loom is complicated. However, there is a problem in that it becomes a large-scale device. Further, in the case where the vibration device is provided between the loom and the floor, the weight of the loom is applied to the vibration device, so that it is necessary to apply vibration against the weight, and vibration energy increases. In addition, since it is heavy, it is difficult to vibrate and the vibration damping effect is reduced.

The present invention has been made in view of such conventional problems, and an object thereof is to provide an anti-vibration device for a loom which has an improved damping effect without complicating the structure.

[0005]

For this reason, according to the present invention, a vibration absorbing member for absorbing the vibration of the loom and supporting the weight of the loom and the pedestal is provided between the floor on which the loom is placed and the floor. A vibration damping device that applies vibration having a phase opposite to that of the vibration of the gantry is arranged on the gantry.

[0006]

The vibration absorbing member damps the vibration generated by the loom body and supports the weight of the loom body and the gantry body. In addition, the active vibration damping device damps the vibration of the gantry body by imparting to the gantry body a vibration having an opposite phase to the vibration of the gantry body. Therefore, the vibration can be effectively damped.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 4 are views showing an embodiment of the present invention. First, the configuration will be described. As shown in FIG. 1, the loom body 1 is mounted on a gantry body 2 with legs (not shown) fixed by bolts. A vibration sensor 3 is attached to the gantry body 2. Further, a vibration absorbing member 5 is provided between the gantry body 2 and the floor surface 4 at the center of the gantry body 2, and is a vibration damping device at four corners of the gantry body 2. A vibrating device 6 is provided.

The vibration absorbing member 5 not only absorbs vibration but also supports the weight of the loom body 1 and the rack body 2. Therefore, it is installed in the central portion of the gantry body 2 where the vibration is relatively small, and is formed to have a relatively large cross-sectional area by vibrating rubber or the like.

The vibration of the loom body 1 is largely influenced by the beating motion, and the reed oscillates around a thread shaft (not shown). Therefore, in FIG. It vibrates greatly in the direction. Therefore, as compared with FIG. 1, it tends to vibrate largely in the direction of swinging around the central portion of the pedestal 2. Therefore, the cradle main body 2 has its central portion supported by the vibration absorbing member 5, the four corners of the gantry main body 2 have the largest amplitude, and the vibrating device 6 which is an active vibration damping device has the same amplitude. Will be arranged in the four large corners. In this embodiment, although it is arranged at four corners, only two or three points among the four corners may be supported depending on the state of vibration, and at that time, the remaining end points are an air spring, a vibration proof rubber, etc. Support in.

The vibration device 6 uses an active fluid damping mount. The configuration will be described with reference to FIG. Reference numeral 11 is a support spring formed of rubber, 12 is a fluid chamber in which a fluid such as oil or water is sealed, and 13 is a support member that is embedded in the center of the support spring 11 above the fluid chamber 12 and supports the support frame 19. Is. Reference numeral 15 denotes a movable plate formed of a magnetic material such as an iron plate, which constitutes one wall surface of the fluid chamber 12, and the outer periphery of which is elastically supported by an elastic body 16. Reference numeral 17 is an electromagnet. The movable plate 15 is attracted or released according to ON / OFF of the electromagnet 17, and the volume of the fluid chamber 12 changes. In accordance with the change, the supporting frame 19 momentarily moves up and down, and the gantry body 2
Vibrate. Since the frequency of the loom is about 10 to 15 HZ, a movable plate having a natural frequency and an electromagnet characteristic that a sufficient vibration force acts at this frequency is used.

FIG. 3 shows a control circuit of the vibrating device 6.
The loom body 1 is placed on a gantry body 2, and the gantry body 2 is provided with an acceleration sensor (vibration sensor) 3 for detecting vibration. Here, the vibration sensor 3 is called a so-called ball position detection type, and although not shown, a steel ball is movably supported in the sensor main body in the vertical direction, and a magnet is arranged around the ball so that the magnetic field This is a method in which the magnetic field change when the position of the steel ball inside is changed is electrically detected and the acceleration of the ball is obtained as vibration. This method is used with high precision as a sensor for measuring instruments. In addition to the above, as the vibration sensor 3, a piezoelectric acceleration sensor (in which the piezoelectric element itself serves as a spring and a power generation element) or a strain gauge type (a weight is attached to the free end of the leaf spring, and both sides of the leaf spring are attached) Various types are known, such as two strain gauges bonded together to form a bridge circuit). The output of the vibration sensor 3 is amplified by the amplifier 22 and input to the controller 21 via the filter 23.
The rotary encoder 24 detects the rotation angle of the main shaft (not shown) of the loom body 1 and inputs it to the controller 21. The controller 21 outputs a vibration signal having a phase opposite to that of the vibration detected by the vibration sensor 3, and the output is the amplifier 2
The vibration is input to the vibrating device 6 via 5, and the vibrating device 6 imparts vibration of a phase opposite to that of the vibration of the gantry body 2 to the gantry body 2.

FIG. 4 shows a flowchart. The control operation will be described in accordance with a flowchart with reference to FIG. In step 31, the loom body 1 is operated. Step 3
In 2, the vibration generated from the loom body 1 is detected by the vibration sensor 3 installed in the frame body 2 and a vibration signal is output. In step 33, the vibration signal is amplified by the amplifier 22. In step 34, the filter circuit 23 selects a predetermined vibration frequency and detects a vibration signal having a frequency to be attenuated.

In step 35, a phase conversion calculation is performed to calculate a vibration signal having a phase opposite to that of the vibration signal detected in step 34. In step 36, the amplifier 25 amplifies the vibration signal having the opposite phase. In step 37, the vibration device 6
ON by applying the opposite phase vibration signal to the electromagnet 17 of
Turn it off and generate an exciting force. This allows the gantry body 2
A vibration having a phase opposite to that of the vibration generated by the loom main body 1 is applied to the machine to actively damp the vibration of the gantry main body 2. After that, the control operation described above is repeated until the operation of the loom body 1 is stopped.

When a vibration signal is received from the vibration sensor 3,
When it is problematic to directly apply the vibration of the opposite phase to the gantry body 2 in terms of the responsiveness of the device, the vibration of the loom body 1 changes in accordance with the operating cycle of the loom, and therefore the vibration change. It is advisable to know the state in advance and measure the rotation angle of the loom main body 1 by the rotary engoder 24 so as to apply the vibration of the opposite phase corresponding to the operation cycle of the loom main body 1. Further, in the above-described embodiment, the structure in which the volume of the fluid chamber is changed by the action of the electromagnet has been described as the vibration device 6, but the invention is not limited to this, and piezoelectric elements are laminated so that a current is applied to vibrate. May be.

Next, a second embodiment of the present invention will be described. In this embodiment, as shown in FIG. 1, the vibration absorbing member 5 and the vibrating device 6 are arranged.
And a hydraulic damper or a damper 7 such as an active fluid damper pin mount having the same structure as the vibration device 6 of the first embodiment.
It is connected with. According to the present embodiment, in addition to the first embodiment, the damper 7 absorbs the lateral vibration, so that a more effective vibration damping effect can be obtained.

5 and 6 show a third embodiment of the present invention. As shown in FIG. 5, the vibration sensor 3 is arranged on the frame main body 2 on which the loom main body 1 is mounted as in the first embodiment. The gantry body 2 is supported at its four corners by air springs 41 that are vibration absorbing members. Further, an active dynamic damper 42, which is a vibration damping device, is vertically installed on the upper surface of the gantry body 2, and an active dynamic damper 43 having the same structure as the active dynamic damper 42 is horizontally installed.

Similar to the first embodiment, the vibration sensor 3 detects the vibration signal of the pedestal body 2 from the vibration signal obtained by measuring the vibration of the gantry body 2, and detects the vibration signal of the frequency to be attenuated, and the control force of the opposite phase to the vibration signal is detected. Active dynamic damper 42,
43 is applied to the gantry body 2 to reduce vibration. At that time, since the laterally installed active dynamic damper 43 is not essential, it damps the lateral vibration of the gantry body 2, so that a more effective vibration damping effect can be obtained by installing the lateral active dynamic damper 43. .

FIG. 6 shows the structure of the active dynamic damper. 45 is a permanent magnet, 46 is a coil, 47
A and 47B are support springs, and 48 is a movable mass. The movable mass 48 is movably supported by a support spring 47 within a limited range. Reference numeral 49 is an enclosure, which is fixed to the gantry body 2. A vibration current having a phase opposite to that of the vibration signal of the loom body 1 is passed through the coil 46. The permanent magnet 45 is the coil 4
It is attracted or repelled due to the difference in polarity caused by the direction of the current flowing in 6, and vibration of the opposite phase is applied to the gantry body 2 by using the inertial force of the movable mass 48 as a reaction force.

[0019]

As described above, the vibration absorbing member absorbs the vibration and supports the weight of the loom body and the cradle main body, and the vibration damping device imparts the vibration having the opposite phase to the vibration generated by the loom to the large amplitude portion of the cradle main body. The vibration damping device can sufficiently exhibit its function and can effectively damp the vibration generated by the operation of the loom.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first embodiment and a second embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a vibration damping device (vibrating device).

FIG. 3 is a block diagram showing a control circuit.

FIG. 4 is a flowchart showing a control operation.

FIG. 5 is a diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a configuration of a vibration damping device (active dynamic damper).

FIG. 7 is a diagram showing a configuration of a conventional example.

[Explanation of symbols]

1 Loom Main Body 2 Stand Main Body 3 Vibration Sensor 5 Vibration Absorbing Member 6 Vibration Device (Vibration Damping Device) 7 Damper 11 Support Spring 12 Fluid Chamber 15 Movable Plate 17 Electromagnet 18 Bellows 21 Controller 22, 25 Amplifier 23 Filter Circuit 41 Vibration Absorbing Member (Air spring) 42, 43 Vibration damping device (active dynamic damper) 45 Permanent magnet 46 Coil 47 Support spring 48 Movable mass

Claims (1)

[Claims] 1. A vibration absorbing member that absorbs the vibration of the rack and supports the weight of the loom and the rack is disposed between the rack on which the loom is placed and the floor, and the vibration of the rack is opposite to that of the vibration of the rack. A vibration damping device for a loom, wherein a vibration damping device for imparting phase vibration is provided.