JPH0515655U - Installation parts for electric motors - Google Patents

Abstract

(57) [Abstract] [Purpose] A flexible installation member absorbs vibration and noise of a motor and eliminates the need for a cup rig at the connection between the motor and the mechanism. [Structure] A storage member 3 and a mounting plate 4 are integrally formed of a flexible material such as rubber to form a mounting member 1, and a geared motor 2 is stored in the storage member 3 of the mounting member 1.
Further, the installation member 1 in which the geared motor 2 is housed is bolted through the bolt holes 4a of the installation plate 4 so that the geared motor 2 is installed in a predetermined place through the installation member 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric motor installation member, and more particularly to an electric motor installation member used as a drive device for a calibration weight lifting mechanism incorporated in a weighing device.

[0002]

[Prior Art]

 For example, some precision weight measuring devices, such as electromagnetic balance weighing devices, have a built-in calibration weight. A device with a built-in weight incorporates a weight lifting mechanism that performs a calibration operation, and calibration can be performed with one touch by operating a switch from outside the device.

FIG. 3 shows a built-in weight raising / lowering mechanism in an electromagnetic balance type weighing device that the inventors have previously proposed (Japanese Patent Application No. 63-72799).

In the configuration shown, the built-in weight has a large weight 31 and a small weight 32 formed in a ring shape. Reference numeral 33 is a support member that supports these large and small built-in weights 31 and 32 and that raises and lowers these weights. 33a, 33b, and 33c are support member frame bodies 33d that are substantially U-shaped in plan view among the support members 33. It is a built-in weight support arm that extends from the inside to the frame. The built-in weights 31 and 32 are supported by the support arms 33a, 33b, 33c and arranged substantially concentrically, and their common center is the axis of the load transmission shaft for transmitting the load of the weighing object to the beam side. Arranged to match.

Next, support pins 34a, 34b, 34c, 34d are inserted into the four corners of the frame 33d of the support member 33, and the support member 33 extends along the shafts of the load transmission shaft along the pins 34a to 34d. The built-in weights 31 and 32 are designed to move up and down while being held horizontally so as to follow the heart. The supporting member 33 and the built-in weight 31 supported by the supporting member 33 when the elevating mechanism comes into contact with the elevating protrusions 33e and 33f that are projected on the opposite sides of the frame 33d. It is designed to raise and lower 32.

Reference numeral 35 is a rotary shaft that is connected to a geared motor 36 and rotates. Of the first cam 37 and the second cam 38 provided on the rotary shaft 35, the first cam 37 is in contact with the lower surface of the ascending / descending projection 33f of the support member 33, and the other second cam 38 is The lower surface of one end of the first oscillating plate 40 forming a part of the up-and-down motion transmission mechanism is in contact. The end of the first swing plate 40 facing the cam 38 contact side swings in the X1-Y1 direction by a fulcrum 41. Next, 42 is a second oscillating plate which is arranged so as to form a right angle with respect to the first oscillating plate 40, and an end portion on the side where the fulcrum 43 contacts the projecting side 33e is X2-Y2. The end on the side that swings in the direction and comes into contact with the first swing plate 40 is disposed so as to be in contact with the lower surface of the first swing plate 40.

In the above-described configuration, first, the built-in weights 31 and 32 are lifted so that no load is applied to the floating frame (not shown) that is a load transmission member for the electromagnetic section side, that is, the load measurement of the weighing object is performed. To make it possible, operate as follows.

First, the geared motor 36 is operated to rotate the first and second cams 37 and 38 via the rotary shaft 35. By the rotation of the first cam 37, the ascending / descending projection 33f that comes into contact with the cam 37 is pushed upward in the X3 direction. Similarly, one of the ends of the ascending / descending movement transmission mechanism pushes up the cam contact end of the first rocking plate 40 in contact with the second cam 38. As a result, the end on the opposite side descends in the Y1 direction around the fulcrum 41, and the end of the second swing plate 42 is pushed down in the same direction. As a result, the end portion of the second swing plate 42 on the side of the ascending / descending projection piece 33e rises in the X2 direction, and pushes this projection piece in the same direction. In other words, the rotation of the cams 37, 38 simultaneously pushes up the lifting protrusions 33e, 33f. By this operation, the support member 33 rises along the pins 34a to 34d, and the built-in weights 31 and 32 supported by the support member 33 rise while maintaining the horizontal state. Subsequently, the cams 37 and 38 are stopped from rotating in the ascended state to support the built-in weights. As a result, the loads of the internal weights 31 and 32 are all supported by the support member 33, and only the load of the weighing object placed on the weighing pan is transmitted to the floating frame which is a member for transmitting the load.

When performing calibration, the mechanism operates as follows. By operating the geared motor 36, the first and second cams 37, 38 are reversed. As a result, the operation is performed in the opposite manner to the above-described upward movement, and the support member 33 is gradually lowered. Since the support heights of the internal weights 31 and 32 by the support member 33 are made different in advance, the lower surface of the small built-in weight 32 is first placed on the floating frame by this lowering, and the load of the weight 32 floats. It is transmitted to the frame. Further, the support member 33 is lowered to place the large built-in weight 31 on the floating frame, and the loads of both built-in weights 31 and 32 are transmitted to the floating frame. Immediately, when calibrating the precision weighing mode of the weighing device, only the small built-in weight 32 is placed on the floating frame. As a result, accurate calibration can be performed by the small built-in weight 32 having a weight suitable for calibration in the precision weight measurement mode. When calibrating the large weight measurement mode, the calibration is performed by the total weight of the small built-in weight 32 and the large built-in weight 31. Reference numeral 44 is a detection device for detecting the rotation angle of the rotary shaft 35, which is composed of, for example, a photo sensor and transmits a signal according to the position of the fin 35 a provided on the rotary shaft 35 to rotate the rotary shaft 35. It is a device for on / off controlling the geared motor 36 in accordance with the angle, that is, the rotation angle of the cams 37, 38 provided on the rotary shaft 35.

[0010]

[Problems to be solved by the device]

 The structure of the lifting mechanism that raises and lowers the ring-type built-in weight has been described above. As the built-in weight, various shapes such as this outer rod shape are used. Are the same in that they are operated by an electric motor that is a drive unit, and have the following common problems as an internal weight lifting mechanism regardless of the shape of the internal weight.

First, since the weighing device that requires the built-in weight is a precise and highly accurate weighing device such as an electronic balance type weighing device, it is necessary to minimize the adverse effects of vibrations generated by the drive unit such as the motor. is there. As a means for reducing this, in the above-mentioned prior art, a configuration is adopted in which the geared motor 36, which is a drive device, is arranged as far as possible from the weighing mechanism, but this is not a fundamental solution to the problem and the rotary shaft 35 As the overall length of the shaft increases, shaft runout and vibration are likely to occur.

The rotation shaft 35 and the geared motor 36 have a shaft center misalignment and the displacement of the rotation shaft 36 a of the geared motor 36 and the rotation shaft 35 in the assembled state are absorbed in the same manner as in the case of a normal shaft connection. Is provided with a large coupling 45. In some cases, the rotary shaft 35 is divided into two parts, and another coupling is arranged in this divided part to more effectively absorb the displacement. However, since the coupling such as the coupling 45 whose main purpose is to absorb displacement is configured such that the coupling itself is elastically deformed, the transmission of the rotation of the geared motor 36 side with respect to the rotating shaft 35 is slightly inaccurate. Could be. In particular, in the structure in which the lifting mechanism operates by rotating the rotating shaft 35 by a quarter rotation or a half rotation as in the illustrated structure, there is a possibility that the built-in weights 31 and 32 are lifted and lowered in time.

Further, in the weighing device incorporating the built-in weight lifting mechanism of FIG. 3, various mechanisms such as a load transmission mechanism and a weighing mechanism, electronic circuits, etc. are housed, so there are many restrictions on the arrangement of the built-in weight lifting mechanism. .. For example, a relatively large space is required to install the large coupling 45 and the angle detector 44. Further, in order to accurately measure the actual rotation angle of the rotary shaft 35 in consideration of the rotational deviation due to the coupling 45, the angle detector 44 must be arranged in the portion after the coupling 45 as viewed from the geared motor 36. However, setting the positions of these members is one of the burdens in designing the weighing device.

[0014]

[Means for Solving the Problems]

 The present invention is configured in view of the above problems, and is a member for mounting an electric motor, which is a drive source of the internal mechanism of a weighing device, at a predetermined place, and is made of a flexible material such as rubber. The electric motor has a storage part that is molded and has a configuration, for example, formed into a substantially cylindrical shape for storing the electric motor, and a mounting part that is integrally formed with the storage part. It is mounted in place via the.

[0015]

[Action]

 The motor is installed in a predetermined place by the installation member made of the flexible material, and the vibration and operating noise of the motor are almost absorbed by the installation member. Further, the elastic deformation of the mounting member absorbs the displacement of the assembling portion of the motor shaft and the rotary shaft for operating the mechanism, so that a large coupling for absorbing the displacement is unnecessary.

[0016]

【Example】

 Embodiments of the present invention will be specifically described below with reference to the drawings.

In FIG. 1, an arrow 1 indicates a member for motor installation (hereinafter simply referred to as “installation member”), and an arrow 2 indicates a geared motor supported by the installation member 1 and installed at a predetermined place.

The illustrated mounting member 1 is made of a flexible material such as rubber or soft plastic. Reference numeral 3 denotes a housing portion that houses the geared motor 2 among the installation members, and has a space portion 3a that houses the geared motor 2. Since the geared motor 2 to be housed is in close contact with the geared motor 2, the internal shape of the space 3a is formed to be substantially the same as the outer shape of the geared motor 2. In addition, the entire outer shape is formed in a substantially cylindrical shape in the illustrated example. Reference numeral 4 denotes an installation plate integrally formed with the storage portion 3, and the installation plate 4 has a plurality of bolt holes 4a through which installation bolts are inserted.

On the other hand, the geared motor 2 housed in the housing part 3 of the installation member 1 is an existing one, and has a motor body 2a and a gear housing 2b connected to the body 2a. The motor rotating shaft 2c is located so as to project from the portion 2b. A power cord 2d is connected to the end of the motor body on the side facing the motor rotation shaft 2a.

The geared motor 2 is inserted from the rear end of the motor into the space 3a of the housing 3 of the installation member 1 as shown by the arrow in the figure. Since the inner diameter of the space 3a is formed to be substantially the same as the outer diameter of the geared motor 2, the geared motor 2 inserted in the storage 3 is securely held in the storage 3. In addition, recesses 3b, 3b formed in a shape corresponding to the motor mounting pieces 2e, 2e formed at the tip of the geared motor 2 are located at the front end edge of the storage portion 3, and the geared motor 2 is stored in the storage portion 3. Since the motor mounting pieces 2e are housed and respectively located in the recesses 3b, the geared motor 2 is securely held by the housing portion 3. The space 3a is also open at the rear end of the storage unit 3, and the power cord 2d connected to the rear end of the geared motor 2 is externally opened from the rear opening of the storage unit 3 after storing the geared motor. Is located at the protruding position.

According to the above procedure, the geared motor 2 is housed in the installation member 1 in advance, and this component is incorporated into the built-in weight lifting mechanism of the weighing device as a drive device for operating the mechanism. If the back surface of the installation plate 4 of the installation member 1 is coated with an adhesive material or a double-sided adhesive tape is attached, the drive device can be attached to a predetermined place of the weighing device with this adhesive material. Installation work can be carried out easily by stopping and then bolting.

Since the installation member 1 that houses and holds the geared motor 2 is made of a flexible material as described above, the rotation shaft on the side of the mechanism connected to the geared motor 2 (similar to the rotation shaft 35 in FIG. 3). ) And the motor rotating shaft 2c are displaced, this displacement is absorbed by the elastic mounting member 1 elastically deforming, so that the motor rotating shaft 2c of the geared motor 2 and this motor rotating shaft 2c are absorbed. It is sufficient to use a small coupling for connection with the rotating shaft on the side of the mechanism to be connected, and it is not necessary to provide one or more large displacement absorption type couplings as described above. In some cases, it is also possible to use a method in which the motor rotation shaft and the rotation shaft on the mechanism side are brazed and connected so as to be semipermanently integrated by bonding or the like without using coupling. It should be noted that if at least a part of the bolt holes 4a formed in the installation plate 4 for adjusting the attachment of the installation member 1 is a long hole, the installation work will be easier.

Since the periphery of the geared motor 2 is covered by the storage portion 3, it is difficult for heat generated by the operation of the motor to be dissipated to the outside, but in the case of a configuration in which the internal weight lifting mechanism of the weighing device is operated. Since the operating time of a motor is about 5 to 6 seconds once, and the calibration work itself is not a frequent work, the reduction of heat dissipation is not a particular problem.

FIG. 2 shows another embodiment of the present invention. In this embodiment, a groove 3c is formed on the inner wall of the storage portion 3 of the installation member 1. A large number of the grooves 3c are formed substantially parallel to the axial direction of the housing portion 3. When the geared motor 2 is housed in the housing portion 3, the grooves 3c are formed in the housing 3 and the outer peripheral wall of the geared motor 2. It is a space formed between the inner wall of the and.

The groove 3c has a function of making it easier to store the geared motor 2 in the storage portion 3a. Further, even if the geared motor 2 is operated for a long time or is frequently operated, the groove 3c effectively releases the heat generated from the motor to the outside through the space portion, thereby suppressing overheating of the motor.

Next, a metal material having magnetic permeability, for example, copper powder or iron powder, is added to the forming material of the mounting member 1, for example, a rubber material, and the mounting member 1 is formed of the material to which the magnetically permeable metal material is added. The installed mounting member 1 is made magnetically permeable. When the mounting member 1 is made of such a material, for example, in an electromagnetic balance type weighing device, it is possible to prevent a situation where the electromagnetic portion of the weighing device is adversely affected by the magnetic field formed by the geared motor 2. ..

It should be noted that the object housed in the installation member 1 has been described by taking a geared motor as an example, but the present invention is not intended to be limited to this, and can also be applied to a normal motor having no deceleration portion. Is.

[0028]

[Effect of the device]

 As described in detail above, the present invention covers and supports the motor with rubber or a flexible material having the same effect as that of the present invention. Therefore, most of the vibrations and operating noises generated by the motor are caused by this mounting member. It is possible to prevent the vibration generated by the motor from being absorbed and adversely affecting other mechanisms, and moreover, the mechanism can be operated quietly.

Further, since the displacement of the combination of the motor housed in the installation member and the mechanism connected to this motor is directly corrected by the flexible installation member, the displacement between the motor and the shaft connected to this motor is corrected. Since it is not necessary to attach a large coupling for displacement absorption, it is possible to increase the degree of freedom in the arrangement of the mechanism operated by this motor and the setting of the attachment position of the member attached to this mechanism.

[Brief description of drawings]

FIG. 1 is a perspective view of a mounting member and a geared motor showing an embodiment of the present invention.

FIG. 2 is a sectional view of an installation member in a state where a geared motor according to a second embodiment of the present invention is housed.

FIG. 3 is a perspective view of a built-in weight lifting mechanism of a weighing device that implements a conventional motor mounting method.

[Explanation of symbols]

 1 Installation member 2 Geared motor 3 Storage part 3c Groove 4 Installation plate

Claims (2)

[Scope of utility model registration request] 1. A storage unit for storing an electric motor, and a plate-shaped installation unit provided below the storage unit for installing the electric motor on a weighing device. The storage unit and the installation unit are available. An installation member for an electric motor, which is integrally formed of a flexible material. 2. The installation member for an electric motor according to claim 1, wherein a metal powder having magnetic permeability is added to the flexible material forming the installation member.