JP2011161679A - Screw-type injection device and method of disassembling/assembling the same - Google Patents

Abstract

The present invention provides a screw type injection device capable of easily and efficiently attaching and detaching a screw, and a method for disassembling and assembling the same.
SOLUTION: A sleeve 14 strongly fitted to a rotor 9c of a built-in motor 9 for injection and an end face of a casing 9a constituting the built-in motor 9 for injection, and a screw shaft 12 constituting a ball screw mechanism 10 are provided. A through hole 17 is provided that allows the bolt 15 that fastens one end to face from the outside. The through-hole 17 is formed on the circumference centered on the rotation center of the screw shaft 12 with a curvature substantially the same as the rotation locus of the bolt 15. The built-in motor 9 for injection is manually operated by inserting a tool into the casing 9a through the through hole 17 and pressing the bolt 15 with the tool. Thereby, even when the power is shut off, the injection built-in motor 9 can be driven to rotate, and the screw can be easily attached and detached.
[Selection] Figure 2

Description

  The present invention relates to a screw type injection device provided in an injection molding machine and a method for disassembling and assembling the screw type injection device, and in particular, facilitating screw replacement work and the like in a screw type injection device provided with a built-in type motor as an electric servomotor for injection. It is related with the means to do.

  FIG. 5 shows a screw type injection device previously proposed by the applicant of the present application, which includes a built-in type motor as an electric servomotor for injection (see, for example, Patent Document 1). As is apparent from this figure, the screw type injection device previously proposed by the applicant of the present application is connected via a connecting bar 101, and a head stock 102 and a holding plate 103 which are arranged to face each other at a predetermined distance, A back end of the heating cylinder 104 fixed to the head stock 102, a screw 105 disposed in the heating cylinder 104 so as to be rotatable and capable of moving back and forth, and the head stock 102 and the holding plate 103 are moved back and forth. The base end portion of the screw 105 is bolted to the linear motion block 106 and the cylindrical sleeve (rotary body) 108a mounted on the linear motion block 106 and disposed on the innermost periphery via the rotational coupling body 107. Built-in motor 108 for weighing, built-in motor 109 for injection attached to the outer surface of the holding plate 103, and holding A screw shaft 111 that is rotatably supported by a rate 103 via a bearing 110, a base end portion of which is connected to a sleeve 109a of an injection built-in type motor 109, and a screw shaft 111, and one end thereof is a built-in type for measurement. It is mainly composed of a nut body 112 connected to a sleeve 108a of the motor 108. A mechanism including the screw shaft 111 and the nut body 112 screwed to the screw shaft 111 is referred to as a ball screw mechanism.

  The head stock 102, the holding plate 103, and the linear motion block 106 are disposed on a base plate 113, and the base plate 113 is fixed on a base frame 114 of an injection molding machine. In addition, a fixed die plate 115 to which a fixed mold (not shown) is attached is set on the base frame 114, and the tip of the nozzle 104 a attached to the tip of the heating cylinder 104 is opened in the fixed die plate 115. The fixed side mold is reached through the nozzle through hole 115a. The head stock 102, the holding plate 103, and the linear motion block 106 are set so as to be able to move forward and backward through a guide rail 116 provided on the base plate 113 and a slide block 117 slidably mounted on the guide rail 116. The nozzle 104a can be inserted into and removed from the nozzle through hole 115a. Note that the base plate 113, the base frame 114, the fixed die plate 115, the guide rail 116, and the sliding block 117 are added by the applicant of the present application to the drawings of Patent Document 1 for convenience of explanation.

  By the way, the screw 105 is used not only when the injection molding machine is assembled, but also when the screw 105 is damaged or maintained, and when the screw 105 is replaced in accordance with changes in the resin material, injection conditions, etc. of the molded product. In addition, it is necessary to attach and detach the rotary connecting body 107. The removal operation of the screw 105 from the heating cylinder 104 and the rotary coupling body 107 is performed according to the following procedure.

  First, the head stock 102, the holding plate 103, and the linear motion block 106 are retracted along the guide rail 116, and the nozzle 104 a is pulled out from the nozzle through hole 115 a provided in the fixed die plate 115. Next, with the head stock 102, the holding plate 103, and the linear motion block 106 mounted, the base plate 113 is turned on the base frame 114, and the nozzle 104a is moved to a position not facing the fixed die plate 115 (for example, Patent Documents). 2 FIG. 5). Thereafter, the base end portion of the screw 105 fastened with bolts is removed from the rotary coupling body 107, the nozzle 104a is removed from the distal end portion of the heating cylinder 104, and the screw 105 is taken out from the nozzle attachment end side of the heating cylinder 104. The operation of attaching the screw 105 to the heating cylinder 104 and the rotary coupling body 107 is performed in the reverse procedure.

JP 2009-45891 A JP 2002-1756 A

  As described above, since the base end portion of the screw 105 is bolted to the rotary coupling body 107, in order to perform the attaching / detaching operation of the screw 105 with respect to the heating cylinder 104 and the rotary coupling body 107, It is necessary to attach and detach the bolt that fastens the screw 105, and in order to perform the attaching and detaching operation of the bolt, a work space having an appropriate size is formed between the head stock 102 and the rotary coupling body 107. There is a need. The distance between the head stock 102 and the rotary connecting body 107 is such that the screw shaft 111 of the bolt screw mechanism connected integrally with the sleeve 109a of the injection built-in type motor 109 is rotated and screwed into this. It is adjusted by moving the nut body 112 of the bolt screw mechanism.

  By the way, when the screw 105 is attached / detached, the power supply to the injection molding machine is cut off for safety. Therefore, it is necessary to manually rotate the sleeve 109a of the built-in type motor 109 for injection. However, the sleeve 109a of the built-in type motor 109 for injection is surrounded by the casing 109b, and the rotary encoder 120 is disposed at the center position of the end surface of the casing 109b. Therefore, the sleeve 109a is manually rotated from the outside. It is difficult to operate, and there is a problem that the screw 105 cannot be attached and detached efficiently.

  The present invention has been made to solve the problems of the prior art, and an object of the present invention is to provide a screw type injection device capable of easily and efficiently attaching and detaching a screw, and a method for disassembling and assembling the screw type injection device. It is to provide.

  In order to solve the above problems, the present invention relates to a screw-type injection device, a base plate fixed on a base frame, a head stock, a holding plate, and a linear motion block mounted on the base plate via a guide rail. A heating cylinder having one end fixed to the headstock, a screw housed in the heating cylinder so as to be rotatable and capable of moving forward and backward, and mounted on the linear motion block, via one end of the screw and a rotating coupling body. And a built-in for injection that drives the screw forward and backward in the heating cylinder, and is connected to the measuring motor for rotationally driving the screw in the heating cylinder. A screw-type injection device including a mold motor, the built-in motor for injection The casing, and the configuration of opening an hole of the rotating part of the injection built-motor can face externally.

  On the other hand, regarding the disassembly and assembly method of the screw-type injection device, a base plate fixed on a base frame, a head stock attached on the base plate via a guide rail, a holding plate and a linear motion block, and the head stock A heating cylinder having one end fixed thereto, a screw housed in the heating cylinder so as to be rotatable and capable of moving forward and backward, and mounted on the linear motion block, and connected to one end of the screw via a rotary coupling body; A metering motor that rotationally drives the screw in the heating cylinder; and a built-in motor for injection that is connected to the linear motion block via a ball screw mechanism and that drives the screw forward and backward in the heating cylinder. A disassembled and assembled method of a screw type injection device, wherein the built-in motor for injection Then, when the setting position of the rotary coupling body with respect to the head stock is changed using the one having a through-hole that can face the rotating part from the outside, the outside through the through-hole from the outside of the casing A required tool is inserted into the casing, and the rotary part of the built-in motor for injection is rotated by the tool.

  According to such a configuration, when changing the set position of the rotary coupling body with respect to the head stock at the time of disassembling and assembling the screw type injection device, a required tool is passed from the outside of the casing to the inside of the casing through the through hole formed in the casing. Since it can be inserted, the rotating part of the built-in injection motor can be manually rotated using the tool, and the set position of the rotary coupling body relative to the headstock can be changed as appropriate. Therefore, it is possible to easily attach and detach the screw to and from the rotary coupling body, and to facilitate disassembly and assembly of the screw type injection device.

  Further, the present invention is the screw type injection device having the above-described configuration, wherein the through hole is formed in an end surface of the casing, and the shape thereof is an arc shape centering on the rotation center axis of the rotating portion of the built-in type motor for injection. It was configured to be.

  According to this configuration, since the amount of rotation of the rotating part that can be rotated by a single operation of the tools can be increased compared to the case where a round hole is made in the casing, it is easy to adjust the setting position of the rotary coupling body with respect to the headstock. And can be done quickly.

  According to the present invention, in the screw type injection device having the above configuration, the through hole is opened at a position facing a head portion of a bolt fastened to a rotating portion of the injection built-in motor.

  According to such a configuration, the tools inserted into the casing through the through hole can be easily engaged with the head portion of the bolt, which is the convex portion, so that the rotating operation of the rotating portion can be facilitated, and the rotating coupling body with respect to the head stock. The setting position can be adjusted easily and quickly.

  The present invention provides a through-hole capable of facing the rotating part of the built-in injection motor from the outside in the casing of the built-in injection motor, and changes the setting position of the rotary coupling body with respect to the headstock. The required tool is inserted into the casing from the outside of the casing and the rotating part of the built-in motor for injection is rotated with the tool, so that the rotating part of the built-in motor for injection can be manually rotated. Become. Therefore, the setting position of the rotary coupling body with respect to the head stock can be changed as appropriate, the screw attachment / detachment work to the rotary coupling body is facilitated, and the disassembly and assembly of the screw type injection device can be facilitated.

It is sectional drawing of the screw-type injection apparatus which concerns on a state which shows a state when a screw is retracted to the injection retreat limit. It is sectional drawing of the screw type injection device which concerns on embodiment which shows a state when a screw is advanced to the injection advance limit. It is an expanded sectional view of the built-in type motor for injection concerning an embodiment. It is an expanded end view of the built-in type motor for injection which concerns on embodiment. It is sectional drawing of the screw type injection device which concerns on a prior art example.

  The basic structure of the screw type injection device according to the present invention is the same as that of the conventional screw type injection device shown in FIG. 5, and is connected via a connecting bar 1 as shown in FIGS. The head stock 2 and the holding plate 3 which are arranged to face each other at a predetermined distance, the heating cylinder 4 whose rear end portion is fixed to the head stock 2, and the heating cylinder 4 so as to be rotatable and movable forward and backward. Mounted on the provided screw 5, the injection nozzle 6 attached to the tip of the heating cylinder 4, the linear motion block 7 that moves back and forth between the headstock 2 and the holding plate 3, and the linear motion block 7, A metering motor 8 that rotationally drives the screw 5 in the heating cylinder 4 and an injection built-in that is attached to the outer surface of the holding plate 3 and drives the screw 5 forward and backward in the heating cylinder 4. A motor 9, is mainly composed of a ball screw mechanism 10 for transmitting the linear motion block 7 converts the rotational force of the injection built-motor 9 into linear force. The ball screw mechanism 10 is rotatably held on the holding plate 3 via a bearing 11 and is screwed to the screw shaft 12 that is rotationally driven by the built-in type motor 9 for injection. The nut body 13 is connected to the linear motion block 7.

  The head stock 2, the holding plate 3, and the linear motion block 7 are installed on a base plate 22 disposed on the base frame 21. A guide rail 23 is provided on the upper surface of the base plate 22, and a slide block 24 that can be attached to the guide rail 23 is provided on the lower surface of the headstock 2, the holding plate 3, and the linear motion block 7. The head stock 2, the holding plate 3 and the linear motion block 7 are movably disposed on the base plate 22 via the guide rails 23 and the sliding blocks 24. The mounting orientation of the base plate 22 with respect to the base frame 21 is such that the head stock 2, the holding plate 3 and the linear motion block 7 are directed parallel to the fixed die plate 31 fixed on the base frame 21, and the parallel state of these members is set. The head stock 2, the holding plate 3, and the linear motion block 7 are adjusted to an orientation that allows the head stock 2, the holding plate 3, and the linear motion block 7 to approach or separate from the fixed die plate 31.

  A fixed mold (not shown) is attached to the back of the fixed die plate 31 viewed from the head stock 2 side. The fixed die plate 31 is provided with a nozzle through hole 32 penetrating from the surface facing the head stock 2 to the fixed die mounting surface, and the injection nozzle 6 attached to the tip of the heating cylinder 4 is connected to the fixed die plate 31. A fixed die attached to the back side of the fixed die plate 31 can be touched.

  During the automatic continuous operation, that is, during the production of the molded product, as shown in FIGS. 1 and 2, the head stock 2, the holding plate 3, and the linear motion block 7 are disposed at the advanced position with respect to the fixed die plate 31. The injection nozzle 6 attached to the tip of the heating cylinder 4 passes through the nozzle through hole 32 provided in the fixed die plate 31 and touches a fixed mold (not shown). The molded product is manufactured by a plasticizing step of plasticizing a raw material resin supplied from a hopper (not shown) through a raw material resin supply hole formed in each of the head stock 2 and the heating cylinder 4, and a plasticized raw material resin. In the final stage of the plasticizing process, the linear motion block 7 is in the retracted position with respect to the headstock 2 as shown in FIG. Thus, the distance between the head stock 2 and the linear motion block 7 is large, and at the final stage of the injection process, as shown in FIG. The distance between the head stock 2 and the linear motion block 7, and hence the distance between the rotary joint 19 attached to the head stock 2 and the linear motion block 7 is small. The distance between the head stock 2 and the rotary connecting body 19 is changed by the rotation of the screw shaft 12 connected integrally with the built-in injection motor 9.

  As shown in more detail in FIG. 3, the injection built-in motor 9 is provided with a casing 9a having a cylindrical appearance, a stator 9b fixed in the casing 9a, and a rotatable inside the stator 9b. The cylindrical sleeve 14 is fixed to the inner peripheral surface of the rotor 9c by strong fitting or the like. One end of a screw shaft 12 constituting the ball screw mechanism 10 is fastened to the sleeve 14 using a bolt 15. A rotary encoder 16 for detecting the rotational position of the rotor 9c is attached to the end surface of the casing 9a, and as shown in FIG. Two arc-shaped through-holes 17 are provided on the circumference that is centered on the rotation center of the screw shaft 12 so as to be opposed to the fastening position. The curvature of the through hole 17 is set to be substantially the same as the rotation locus of the bolt 15. If it does in this way, while the bolt 15 arrange | positioned in the casing 9a from the exterior of the casing 9a can be faced, tools, such as a screwdriver, can be inserted in the casing 9a through the through-hole 17, Therefore By hooking on the head, the screw shaft 12 can be easily rotated in a predetermined direction. Thereby, the manual adjustment of the space | interval of the head stock 2 and the linear motion block 7 is attained.

  The shape of the through hole 17 is not limited to the arc shape, and may be a circle or other shapes. Further, the opening position of the through hole 17 does not necessarily need to be set to be substantially the same as the rotation locus of the bolt 15, and may be a position where the rotating portion of the injection built-in motor 9 can be manually rotated from the outside.

  As the metering motor 8, a built-in type motor similar to the built-in type motor 9 for injection can be used, or another type of motor can be used. 1 and 2 show an example in which a motor other than the built-in type motor is used as the weighing motor 8. The rotational force of the measuring motor 8 is transmitted via a belt 18 to a rotary connecting body 19 that is rotatably provided on the linear motion block 7. A base end portion of the screw 5 is fastened to the rotary connecting body 19 using a bolt 20. Therefore, when the screw 5 is attached to and detached from the rotary connecting body 19, a space for attaching and detaching the bolt 20 is required between the head stock 2 and the linear motion block 7.

  Hereinafter, a method for disassembling and assembling the screw type injection device according to the embodiment configured as described above will be described.

  As shown in FIG. 2, when the final injection process is completed, the nozzle through hole in which the linear motion block 7 is in the forward limit position with respect to the head stock 2 and the injection nozzle 6 is opened in the fixed die plate 31. 32 is touched to a fixed mold (not shown). At this time, the linear block 7 is advanced to the injection advance limit by the ball screw mechanism 10 that converts the rotational force of the injection built-in type motor 9 into the linear advance force. Therefore, the screw 5 is also positioned at the injection advance limit. It is in. In this state, it is impossible to take out the screw 5 from the heating cylinder 4.

  Therefore, after the power supplied to the screw type injection device is cut off, the head stock 2, the holding plate 3 and the linear motion block 7 are fixed on the base plate 22 by using the guide rail 23 and the sliding block 24. The injection nozzle 6 is pulled out to a position where it does not interfere with the fixed die plate 31. Next, the base plate 22 is turned with respect to the base frame 21, and the injection nozzle 6 is moved to a position not facing the fixed die plate 31. The screw 5 is removed from the heating cylinder 4 by removing the injection nozzle 6 from the tip of the heating cylinder 4 and removing the screw 5 from the rotary connecting body 19 and then pulling out the screw 5 from the tip of the heating cylinder 4. However, as described above, in the state where the final injection process is completed, the linear motion block 7 is advanced to the injection advance limit, and the interval between the head stock 2 and the rotary connecting body 19 is narrowed. It is impossible or extremely difficult to remove the bolt 20 that fastens the screw 5 to the rotary coupling body 19.

  In the state where power is supplied to the screw type injection device, the interval between the headstock 2 and the linear motion block 7 can be easily adjusted by rotating the injection built-in type motor 9 electrically. During assembly work, the power supply is interrupted to ensure safety, and therefore the built-in injection motor 9 cannot be rotated and driven electrically. Therefore, in this embodiment, a tool such as a screwdriver is inserted into the casing 9a from the outside through the through-hole 17 provided in the casing 9a of the injection built-in motor 9, and the tool is hooked on the head of the bolt 15, The injection built-in motor 9 is manually rotated in a predetermined direction to adjust the distance between the head stock 2 and the rotary coupling body 19.

  The assembly work of the screw 5 into the heating cylinder 4 is performed in the reverse order of the above disassembly work. It should be noted that the above-described screw disassembling and assembling work can also be applied when assembling the screw type injection device.

  Since the screw type injection device according to the present embodiment has a through-hole 17 that can face the rotating part of the injection built-in type motor 9 from the outside, on the end surface of the casing 9a constituting the injection built-in type motor 9, By inserting a tool into the casing 9a through the through-hole 17, the built-in injection motor 9 can be easily driven to rotate manually. Therefore, the position adjustment of the head stock 2 and the rotary coupling body 19 in a state where no power is supplied can be facilitated, and the disassembly and assembly work of the screw type injection device can be facilitated.

  The present invention can be used for a screw type injection device applied to an injection molding machine.

DESCRIPTION OF SYMBOLS 1 Connection bar 2 Headstock 3 Holding plate 4 Heating cylinder 5 Screw 6 Injection nozzle 7 Linear motion block 8 Metering motor 9 Injection built-in motor 9a Casing 10 Ball screw mechanism 12 Screw shaft 13 Nut body 14 Sleeve 15 Bolt 16 Rotary encoder 17 Through-hole 18 Belt 19 Rotating connector 20 Bolt 21 Base frame 22 Base plate 23 Guide rail 24 Slide block 31 Fixed die plate 32 Nozzle through hole

Claims (4)

A base plate fixed on the base frame; a head stock mounted on the base plate via a guide rail; a holding plate and a linear motion block; a heating cylinder having one end fixed to the head stock; and the heating cylinder A screw housed in a rotatable and forward / backward direction, mounted on the linear motion block, and connected to one end of the screw via a rotary coupling body, and for rotationally driving the screw in the heating cylinder In a screw type injection device including a motor, and a built-in type motor for injection that is connected to the linear motion block via a ball screw mechanism and drives the screw back and forth in the heating cylinder,
A screw-type injection device characterized in that a through-hole is provided in the casing of the injection built-in type motor so that a rotating part of the injection built-in type motor can be exposed from the outside.   2. The screw according to claim 1, wherein the through hole is formed in an end surface of the casing, and a shape thereof is an arc shape centering on a rotation center axis of a rotating portion of the injection built-in motor. Type injection device.   The screw according to any one of claims 1 and 2, wherein the through hole is opened at a position facing a head portion of a bolt fastened to a rotating portion of the injection built-in motor. Type injection device. A base plate fixed on the base frame; a head stock mounted on the base plate via a guide rail; a holding plate and a linear motion block; a heating cylinder having one end fixed to the head stock; and the heating cylinder A screw housed in a rotatable and forward / backward direction, mounted on the linear motion block, and connected to one end of the screw via a rotary coupling body, and for rotationally driving the screw in the heating cylinder A disassembly and assembly method of a screw type injection device comprising a motor, and a built-in type motor for injection that is connected to the linear motion block and a ball screw mechanism to drive the screw back and forth in the heating cylinder,
As the built-in type motor for injection, when a through-hole that can face the rotating part from the outside is opened in the casing, and when changing the setting position of the rotary coupling body with respect to the headstock, the through-hole A disassembling and assembling method of a screw type injection device, wherein a required tool is inserted into the casing from the outside of the casing, and the rotating part of the built-in type motor for injection is rotated by the tool.

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