JP5160943B2 - Molding machine and motor for molding machine - Google Patents

Description

  The present invention relates to a molding machine such as an injection molding machine or a die-casting machine, and a molding machine motor provided in the molding machine, and particularly relates to a miniaturization means thereof.

In recent molding machines, a gear mechanism is used as a drive system of a ball screw mechanism provided in an injection device or a mold clamping device in order to reduce the mechanical structure and improve the response to start, stop, acceleration and deceleration control of a drive system. A direct drive system is adopted in which the rotational force of the motor for the molding machine is directly transmitted to the rotating body of the ball screw mechanism without using a power transmission mechanism such as a row or a timing belt. For example, Patent Document 1 discloses a technique in which an injection motor is attached to a fixed plate connected to a front plate via a guide bar, and a ball screw nut held on the fixed plate is rotationally driven by the injection motor. ing.
Japanese Patent Application No. 9-329474

  By the way, as shown in FIG. 7, in the conventional motor 100 for a molding machine, the attachment portions 101 to the fixing plate 200 are formed in a substantially square shape, and one bolt through hole or screw hole 102 is provided at each of the four corner portions. Therefore, in order to attach the attachment portion 101 to the fixing plate 200 so as not to interfere with the guide bar 201, the diagonal dimension of the fixing plate 200 is made larger than the diagonal dimension of the attachment portion 101. However, there is a problem that the fixing plate 200 is increased in size because it must be at least as large as the diameter of the guide bar 201 or more.

  As is clear from FIG. 8, the mounting portion 101 is rotated around its central axis with respect to the fixed plate 200, and the arrangement direction of the guide bar 201 and the arrangement direction of the bolt through hole or screw hole 102 are mutually Even if different, it is difficult to downsize the fixing plate 200.

  The present invention has been made to solve the problems of the prior art, and an object thereof is a molding machine in which an injection unit including a small motor for a molding machine and a mounting plate for the motor for the molding machine is miniaturized. Is to provide.

  In order to solve this problem, the present invention relates to a motor mounting plate, a connecting bar having one end fixed to the motor mounting plate and the other end fixed to another member, and the motor mounting plate. In a molding machine having an attached molding machine motor and a rotating body that is rotationally driven by the molding machine motor, the motor mounting plate includes four pieces for inserting the end portions of the connecting bar into four corner portions. The connecting bar insertion holes are formed, and bolt through holes are formed in both side portions of the connecting bar insertion holes with respect to the rotation direction of the molding motor, and the molding machine motor is disposed in the bolt through holes. The motor is attached to the motor mounting plate by a bolt penetrating through the motor.

  In this way, four connection bar insertion holes for inserting the end portions of the connection bars are formed at the four corners of the motor mounting plate, and bolts are formed on both sides of each connection bar insertion hole in the rotational direction of the molding motor. When the through hole is opened, it is not necessary to arrange the connecting bar insertion hole on the outer periphery of the bolt through hole, and the connecting bar insertion hole can be arranged between the bolt through holes. Therefore, the injection unit including the motor mounting plate As a result, it is possible to reduce the size of the molding machine.

  On the other hand, the molding machine motor has a cylindrical motor stator, a cylindrical motor rotor disposed in the motor stator, and a mounting portion provided on an end surface of the motor stator. In the molding machine motor attached to the molding machine by fastening the attachment part to a motor attachment plate provided in the molding machine, the four corners of the attachment part are spaced apart with respect to the rotation direction of the motor rotor. Two screw holes are provided so as to be spaced apart from each other, and a bolt penetrating a bolt through hole provided in a portion corresponding to the screw hole of the motor mounting plate is screwed into the screw hole. Accordingly, the motor mounting plate is fastened.

  In this way, if two screw holes are opened at each of the four corners of the mounting portion, the molding machine motor can be fastened to the motor mounting plate with a total of eight bolts. Compared to the case where a screw hole is opened at each of the four corners, and the motor for the molding machine is fastened to the motor mounting plate with a total of four bolts, it is possible to use smaller diameter bolts and reduce the diameter of the screw holes. Can be small. Further, if the two screw holes are arranged at a constant interval in the rotation direction of the motor rotor, the mounting portion does not increase in size even if the number of screw holes is increased. Therefore, from these, it is possible to reduce the size of the mounting portion, and thus the motor for the molding machine.

  The molding machine of the present invention forms four connection bar insertion holes for inserting the end portions of the connection bars at the four corners of the motor mounting plate, and opens bolt through holes at both sides of each connection bar insertion hole. As a result, the connecting bar insertion hole can be disposed between the bolt through holes, and the injection unit including the motor mounting plate can be reduced in size.

  In the motor for a molding machine according to the present invention, two screw holes are arranged in the rotation direction of the motor rotor at each of the four corners of the mounting portion, so that the screw hole can be reduced in diameter and the mounting portion can be reduced in size. be able to.

  Hereinafter, an embodiment of a molding machine according to the present invention and a motor for a molding machine used in the molding machine will be described with reference to FIGS. 1 to 5. FIG. 1 is a cross-sectional view of a main part of a molding machine according to the embodiment, FIG. 2 is a front view of a motor mounting plate according to the embodiment, and FIG. 3 is a front view as viewed from the mounting plate side of the injection servomotor according to the embodiment. FIG. 4 is an explanatory view showing an overlapping state of the mounting plate of the injection servo motor with respect to the motor mounting plate, and FIG. 5 is an explanatory view showing a fastening state of the connecting bar and the injection servo motor with respect to the motor mounting plate.

  As shown in FIG. 1, the molding machine of this example includes a head stock 1 and a motor mounting plate 2 which are arranged on a not-shown injection unit base board and facing each other at a predetermined distance, and these head stock 1 and motor mounting. A connecting bar 3 spanned between the plate 2, a linear motion block 4 guided by the connecting bar 3 to move forward and backward between the headstock 1 and the motor mounting plate 2, and a bearing on the motor mounting plate 2 A ball screw mechanism 8 comprising a screw shaft 6 rotatably held via 5 and a nut body 7 screwed thereto, and a head stock 1 which is held rotatably and movable forward and backward, one end of the linear motion block 4 A screw 9 of an injection device attached to the motor, an outer surface of the motor mounting plate 2, an injection servomotor (motor for molding machine) 10 that rotationally drives the screw shaft 6, and a linear motion block 4. It is mainly composed of the metering servo motor 20 for rotating the clew 9.

  The injection servomotor 10 is wound around an outer periphery of a casing 11, a mounting portion 12 configured integrally with the casing 11, a cylindrical motor stator 13 fixed to the inner surface of the casing 11, and the motor stator 13. The motor coil 14, the cylindrical motor rotor 15 disposed in the motor stator 13, the motor magnet 16 attached to the outer surface of the motor rotor 15, the motor rotor 15 and the motor magnet 16 in a casing. 11, and a bearing 17 that is rotatably supported by the motor rotor 11. When the screw shaft 6 is fitted to the inner periphery of the motor rotor 15, the rotation of the motor rotor 15 is transmitted to the screw shaft 6. ing. The injection servo motor 10 is fastened by using bolts 18 to an injection motor setting portion in which a mounting portion 12 is formed on the back side of the motor mounting plate 2.

  The measuring servo motor 20 includes a casing 21, a cylindrical motor stator 22 fixed to the inner surface of the casing 21, a motor coil 23 wound around the outer periphery of the motor stator 22, and the motor stator 22. A bottomed cylindrical motor rotor 24 arranged, a motor magnet 25 attached to the outer surface of the motor rotor 24, and a bearing 26 that rotatably supports the motor rotor 24 and the motor magnet 25 on the casing 21. It is configured. A spline hole 24a is formed at the bottom of the motor rotor 24. By inserting the spline 9a formed at the tip of the screw 9 into the spline hole 24a, the rotation of the motor rotor 24 is controlled by the screw 9. To communicate. Further, the nut body 7 of the ball screw mechanism 8 is strongly fitted to the other end side of the motor rotor 24, and the linear motion block 4, the measuring servomotor 20, The screw 9 is guided by the connecting bar 3 and moves forward and backward integrally.

  In the molding machine configured as described above, when the measuring servo motor 20 is driven to rotate in a predetermined direction from a control device (not shown) via a motor driver (not shown), the rotation of the motor rotor 24 is transmitted via the spline hole 24a and the spline 9a. Is transmitted to the screw 9, and the screw 9 rotates at a predetermined rotational speed. Thus, the molding material is supplied from a hopper (not shown), and the molding material is plasticized, kneaded and measured in a heating cylinder (not shown). Further, when the injection servo motor 10 is rotationally driven in a predetermined direction from a control device (not shown) via a motor driver (not shown), the rotational motion is transmitted to the screw shaft 6 of the ball screw mechanism 8 and the rotational motion of the screw shaft 6 is a nut. It is converted into the forward movement of the body 7, and the linear motion block 4, the measuring servo motor 20 and the screw 9 are integrally guided by the connecting bar 3 to move forward. Thus, the molding material is injected from a nozzle (not shown) into a mold (not shown).

  As shown in FIG. 2, the motor mounting plate 2 is formed in a substantially square front shape, and four connecting bar insertion holes 2a for inserting and holding one end of the connecting bar 3 are formed at the four corners. A bolt through hole 2b for fastening a connection bar having a smaller diameter than the connection bar insertion hole 2a is formed concentrically with the connection bar insertion hole 2a. Moreover, the bolt through-hole 2c for penetrating the bolt 18 for fastening the servomotor for injection is opened in the both sides of each connecting bar insertion hole 2a. In FIG. 2, the symbol G is the mounting center of the injection servo motor 10 on the motor mounting plate 2 and coincides with the rotation center of the injection servo motor 10. Therefore, as is clear from FIG. 2, the bolt through holes 2 c are arranged along the rotation direction of the injection servomotor 10.

  In this example, the bolt through holes 2c are arranged on the circumference of the radius D1 from the rotation center G of the injection servo motor 10, and the radius D2 larger than that by the radius d of the connecting bar insertion hole 2a. Although the connecting bar insertion holes 2a are arranged on the circumference of (= D1 + d), the gist of the present invention is not limited to this, and the radii D1 and D2 have the predetermined output servo motor 10 for injection. Can be arbitrarily set as long as the can be mounted.

  The mounting portion 12 of the injection servo motor 10 is provided with a screw hole 12a for screwing the bolt 18 in a portion corresponding to the opening position of the bolt through hole 2c opened in the motor mounting plate 2. That is, as shown in FIG. 3, the mounting portion 12 of the injection servo motor 10 is also formed in a substantially square front shape, and two screw holes 12a are provided at four corners at predetermined intervals. Has been established. In FIG. 3, symbol G is the rotation center of the injection servo motor 10. Therefore, as is apparent from FIG. 3, the screw holes 12 a are arranged along the rotation direction of the injection servo motor 10.

  As shown in FIGS. 4 and 5, the injection servo motor 10 is attached to the motor mounting plate 2 with the mounting portion 12 of the injection servo motor 10 and the bolt through hole 2 c provided in the motor mounting plate 2. After overlapping the screw hole 12a opened in the portion 12, the bolt 18 penetrated into the bolt through hole 2c is screwed into the screw hole 12a, thereby being fastened to the motor mounting plate 2. As shown in FIG. 5, the connecting bar 3 is fastened to the motor mounting plate 2 by a bolt 19 that passes through a bolt through hole 2b that is concentric with the connecting bar insertion hole 2a.

  In the molding machine of this example, four connection bar insertion holes 2a for inserting the end portions of the connection bar 3 are formed at the four corners of the motor mounting plate 2, and each connection is made with respect to the rotation direction of the injection servo motor 10. Since the bolt through holes 2c are opened on both sides of the bar insertion hole 2a, it is not necessary to arrange the connecting bar insertion hole 2a on the outer periphery of the bolt through hole 2c, and the connection bar insertion hole 2a is arranged between the bolt through holes 2c. It becomes possible to do. Therefore, it is possible to reduce the size of the injection unit including the motor mounting plate 2 and the size of the molding machine.

  In addition, since the injection servo motor 10 of this example has two screw holes 12a at the four corners of the mounting portion 12, the injection servo motor 10 is attached to the motor mounting plate 2 with a total of eight bolts 18. Can be concluded. Therefore, as compared with the conventional case where one screw hole is opened at each of the four corners of the mounting portion and the motor for the molding machine is fastened to the motor mounting plate with a total of four bolts, the diameter of the bolt 18 is reduced. As a result, the diameter of the screw hole 12a can be reduced. In addition, since the two screw holes 12a are arranged at a constant interval in the rotation direction of the motor rotor 15, an increase in the size of the mounting portion 12 can be prevented even if the number of the screw holes 12a is increased. Therefore, from these, it is possible to reduce the size of the mounting portion 12 and hence the servo motor 10 for injection.

  In the above-described embodiment, the injection servo motor 10 and the motor mounting plate 2 that is a setting portion thereof have been described as examples. However, the gist of the present invention is not limited to this, and for example, opening and closing of a mold The present invention can be similarly applied to a mold opening / closing servomotor used for operation and its setting unit.

  Moreover, in the said embodiment, although demonstrated taking the case of the attachment plate 2 in which the front shape was formed in the substantially square shape, the summary of this invention is not limited to this, For example, front shape as shown in FIG. The present invention can be similarly applied to a mounting plate having.

It is principal part sectional drawing of the molding machine which concerns on embodiment. It is a front view of the motor mounting plate which concerns on embodiment. It is the front view seen from the attachment board side of the servomotor for injection which concerns on embodiment. It is explanatory drawing which shows the overlapping state of the attachment board of the servomotor for injection | emission with respect to a motor attachment board. It is explanatory drawing which shows the fastening state of the connection bar with respect to a motor mounting plate, and the servomotor for injection. It is a front view of the other motor mounting plate which concerns on embodiment. It is explanatory drawing of a prior art. It is explanatory drawing which shows the modification of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Headstock 2 Motor mounting plate 2a Connection bar insertion hole 2b Bolt through hole 2c Bolt through hole 3 Connection bar 4 Linear motion block 5 Bearing 6 Screw shaft 7 Nut body 8 Ball screw mechanism 9 Screw 10 Injection servo motor (motor for molding machine) )
12 Mounting plate 12a Screw hole 20 Servo motor for weighing

Claims (2)

A motor mounting plate, a connecting bar having one end fixed to the motor mounting plate and the other end fixed to another member, a molding machine motor mounted to the motor mounting plate, and a rotation by the molding machine motor In a molding machine having a driven rotating body,
The motor mounting plate has four connecting bar insertion holes for inserting the end portions of the connecting bars at four corners, and both side portions of the connecting bar insertion holes with respect to the rotation direction of the molding motor. Bolt through holes are established in
The molding machine is characterized in that the molding machine motor is fastened to the motor mounting plate by a bolt penetrating into the bolt through hole. A cylindrical motor stator, a cylindrical motor rotor disposed in the motor stator, and a mounting portion provided on an end surface of the motor stator, the mounting portion being provided in the molding machine In the molding machine motor attached to the molding machine by fastening to the motor mounting plate
In the four corners of the mounting portion, two screw holes are provided, which are arranged at a certain interval with respect to the rotation direction of the motor rotor,
For a molding machine characterized in that the motor mounting plate is fastened to the motor mounting plate by screwing a bolt penetrated into a bolt through hole formed in a portion corresponding to the screw hole of the motor mounting plate. motor.

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