JP2003159733A - Injection unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To downsize an injection unit, reduce the number of components, and lower the cost of the injection unit. <P>SOLUTION: This injection unit has an injection frame, a cylinder member, an injection member, a rotary sliding member 68 which is attached to the injection member, a stator 25 which is attached to the injection frame, and a rotatably supported rotor 26. The rotor 26 is equipped with a hollow cylindrical body 29 and a magnet, which are arranged so as to be relatively movable outward in the radial direction of the member 68. In this case, since the rotor 26 equipped with the cylindrical body 29 and the magnet can transmit generated rotation directly to the member 68, a transmission system such as an output gear, a counter-drive gear, a counter-driven gear and the like is made unnecessary, and the number of the components can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a screw is rotatably and reciprocally arranged in a heating cylinder of an injection device, and the screw is rotated or reciprocated by driving a driving unit. You can do it. Then, in the measuring step, when the screw is rotated, the resin supplied from the hopper into the heating cylinder is heated, melted and advanced, and is stored in front of the screw head attached to the front end of the screw. . Further, in the injection step, when the screw is moved forward, the resin stored in front of the screw head is injected from the injection nozzle,
It is filled in the cavity space of the mold device.

FIG. 2 is a conceptual diagram of a conventional injection device.

In the drawing, 11 is a heating cylinder,
In the heating cylinder 11, a screw 12 is rotatably and movably arranged (movable in the left-right direction in the drawing). An injection nozzle (not shown) is attached to the front end (left end in the drawing) of the heating cylinder 11, and a nozzle port is formed in the injection nozzle.

The rear end (right end in the figure) of the heating cylinder 11 is attached to a front injection support 61, and a rear injection support 62 is arranged at a predetermined distance from the front injection support 61. The front injection support 61 is
It is composed of a box-shaped main body 61a and a cover 61b. And
A rod 63 is installed between the front injection support 61 and the rear injection support 62, and the rod 63 maintains a predetermined distance between the front injection support 61 and the rear injection support 62. Also, front injection support 6
1, the rear injection support 62 and the rod 63 constitute an injection frame.

At the rear end of the screw 12,
A coupling body 64 having a circular shape is integrally attached via a coupler 59, and a cylindrical support body 65 is attached to the coupling body 64.
Are attached via bolts bt1. The connecting body 64 and the support body 65 constitute a rotary sliding member 68 that rotates integrally with the screw 12. A male spline 92 is formed on the outer peripheral surface of the rear end of the support 65.
Is formed.

In order to transmit the rotation to the rotary sliding member 68, a cylindrical rotary member 78 is disposed so as to surround the rotary sliding member 68, and the inner peripheral surface of the rotary member 78 has an axial direction. At, a female spline 93 having a length corresponding to the stroke of the screw 12 is formed. The rotating member 78 has bearings b1, b2 with respect to the front injection support 61.
It is rotatably supported by.

An electric metering motor 70 is provided, the metering motor 70 is driven in the metering step to rotate the rotary sliding member 68, and by the torque generated in the opposite direction in the injection step. Rotary sliding member 68
To stop the rotation of. The measuring motor 70 is attached to a stator (not shown), a rotor (not shown) arranged radially inward of the stator, an output shaft 74, and the output shaft 74, and detects the rotation speed of the measuring motor 70. The encoder 70a is provided and controlled based on the detection signal of the encoder 70a. The stator and rotor are
Each includes a core and a coil wound around the core.

The measuring motor 70 and the rotary sliding member 68
Between the output gear 75, the counter drive gear 76,
A counter driven gear 77 and the rotating member 78 are arranged, an output gear 75 is attached to the output shaft 74,
The output gear 75 and the counter drive gear 76 mesh with the counter drive gear 76 and the counter driven gear 77, and the counter driven gear 77 is attached to the rotating member 78 by the bolt bt3.

The output gear 75, the counter drive gear 76, the counter driven gear 77 and the rotating member 78 are
The rotation generated by driving the measuring motor 70 is transmitted to the rotary sliding member 68. Therefore, the rotary sliding member 68 cannot rotate relative to the rotary member 78,
Further, it is disposed so as to be movable in the axial direction, and the outer peripheral surface of the connecting body 64 and the inner peripheral surface of the rotating member 78 are slidably brought into contact with each other. That is, the female spline 93 and the male spline 92 are slidably engaged with each other.

Therefore, when the output shaft 74 is rotated by driving the measuring motor 70, the rotation is rotated by the output gear 75, the counter drive gear 76, the counter driven gear 77 and the rotating member 78. Is transmitted to the screw 1 to rotate the rotary sliding member 68 in the forward direction or in the reverse direction as necessary,
2 is rotated. Further, when the driving of the measuring motor 70 is stopped and the output shaft 74 is restrained by the restraining force, the rotation of the rotary sliding member 68 is stopped and the rotation of the screw 12 is stopped.

Further, behind the front injection support 61 (to the right in the figure), a ball screw 83 as a motion direction changing portion is arranged, which comprises a ball screw shaft 81 and a ball nut 82 screwed together. Set up. The ball screw shaft 81 includes a small-diameter shaft portion 84 sequentially formed from the front end to the rear end, a large-diameter screw portion 85, a connecting portion connected to the electric injection motor 90, and the like. An annular flange member 89 is externally fitted to the step portion of the shaft portion 84 and the screw portion 85.

Then, the injection motor 90 is fixed to the rear injection support 62 via the load cell 96 and is driven in the injection process, and the rotation generated thereby is transmitted to the ball screw shaft 81. The ball screw 83 is a linear motion that accompanies the rotational motion caused by the rotation generated by the injection motor 90, that is,
It is converted into rotational rectilinear motion, and the rotational rectilinear motion is transmitted to the rotary sliding member 68.

Therefore, the ball screw shaft 81 is supported at the front end by bearings b7 and b8 so as to be rotatable with respect to the rotary sliding member 68 and immovable in the axial direction, and has a ball nut 82 at the center. Is rotatably screwed and supported with respect to. That is, the rotary sliding member 68 is disposed rotatably with respect to the ball screw 83 and axially movable with respect to the rotary member 78. Further, a male screw (not shown) is formed at the front end portion (left end portion in the drawing) of the shaft portion 84, and the bearing nut 80 is arranged by being screwed into the male screw. The bearing nut 80 positions the bearing b7 together with the protrusion 65a formed on the inner peripheral surface of the support body 65. The ball nut 82 is fixed to the rear injection support 62 via the load cell 96.

Therefore, when the rotation generated by driving the injection motor 90 in the forward and reverse directions is transmitted to the ball screw shaft 81 via the connecting portion, the ball screw shaft 81 is Since the screw portion 85 and the ball nut 82 are screwed together, they are moved forward and backward while rotating.

In the injection process and the like, the rotation of the rotary sliding member 68 is stopped by stopping the driving of the measuring motor 70, and in this state, the injection motor 90 is stopped.
When is driven, the rotary sliding member 68 can be moved forward (moved leftward in the drawing) in the axial direction without rotating. As a result, the linear motion is transmitted to the screw 12 integrally attached to the rotary sliding member 68, and the screw 12 can be moved forward.

Next, a method of driving the injection device having the above structure will be described.

First, in the weighing process, the weighing motor 7 is used.
When 0 is driven, the rotation generated on the output shaft 74 is
It is transmitted to the screw 12 via the output gear 75, the counter drive gear 76, the counter driven gear 77, the rotating member 78, and the rotary sliding member 68, and rotates the screw 12 in the forward direction.

Along with this, resin (not shown) supplied from a hopper (not shown) arranged in the heating cylinder 11 is advanced in a groove (not shown) formed on the outer peripheral surface of the screw 12, and the screw 12 is retracted. (Moved to the right in the figure), the resin
It is stored in front of a screw head (not shown) attached to the front end of the. At this time, the rotary sliding member 68 is moved relative to the rotary member 78 and is retracted in accordance with the retracting force generated in the screw 12. Further, as the rotary sliding member 68 retracts, the ball screw shaft 81 also rotates and retracts.

Next, in the injection process, the injection motor 9 is used.
0 is driven, and at this time, the rotation generated in the rotor (not shown) of the injection motor 90 is transmitted to the ball screw shaft 81 via the connecting portion, and the ball screw 83 converts the rotational motion into the rotational rectilinear motion. It As a result, the ball screw shaft 81 is rotated and advanced.

When the rotary sliding member 68 is stopped by the measuring motor 70, the screw 12
Is integrally attached to the rotary sliding member 68, so that it can be advanced without rotating.

[0022]

However, in the conventional injection device, in order to transmit the rotation generated by the measuring motor 70 to the rotary sliding member 68, the output gear 75, the counter drive gear 76, Since the counter driven gear 77 and the rotating member 78 are required, not only noise due to meshing of gears or the like and the size of the injection device are increased, but also the number of parts is increased, torque loss is generated, and the injection device is generated. Cost will be high.

Further, at the time of assembling and maintaining the injection device, the ball screw 83 is incorporated into the injection device together with the support 65 and the bearings b7 and b8. It must be done in consideration of the engagement (biting) between the female spline 93 and the female spline 93. If the male spline 92 and the female spline 93 are not properly engaged, the time required for the assembling work is long. As a result, the assemblability and the maintainability deteriorate.

The present invention solves the above-mentioned problems of the conventional injection device, can prevent the generation of noise, can be downsized, can reduce the number of parts, and can reduce the torque loss. It is an object of the present invention to provide an injection device that can prevent the occurrence of the above and can reduce the cost.

[0025]

Therefore, in the injection apparatus of the present invention, an injection frame, a cylinder member attached to the injection frame, and a rotatable and forward / backward movement within the cylinder member are arranged. It has an injection member provided, a rotary sliding member attached to the injection member, a stator attached to the injection frame, and a rotor rotatably supported inward in the radial direction of the stator.

The rotor is provided with a hollow cylindrical body arranged so as to be relatively movable outward in the radial direction of the rotary sliding member, and a magnet attached to the cylindrical body.

The other injection device of the present invention further comprises a case formed integrally with the injection frame.

In yet another injection device of the present invention, the stator and the rotor further constitute a first drive unit for rotating the rotary sliding member in the measuring step.

In still another injection device of the present invention, the stator and the rotor further constitute a second drive unit for axially moving the rotary sliding member in the injection step.

In still another injection device of the present invention, a motion direction converting portion for converting the rotational motion of the rotation generated in the rotor into a linear motion and transmitting the linear motion to the rotary sliding member is further provided. Have.

In still another injection device of the present invention, the movement direction conversion section further includes first and second conversion elements. Then, the first conversion element is rotatably supported by the rotary sliding member.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram of an injection device according to an embodiment of the present invention.

In the figure, 11 is a heating cylinder as a cylinder member, and 12 is a screw as an injection member which is rotatably and reciprocally (moved in the left-right direction in the drawing) arranged in the heating cylinder 11. An injection nozzle (not shown) is attached to the front end (left end in the drawing) of the heating cylinder 11, and a nozzle port is formed in the injection nozzle.

The screw 12 is a screw body,
And a screw head (not shown) attached to the front end of the screw body, and a flight (not shown) is spirally formed on the outer peripheral surface of the screw body, and the flight forms a spiral groove.

The rear end (right end in the figure) of the heating cylinder 11 is attached to a front injection support 21 as a front support, and a rear injection support as a rear support with a predetermined distance from the front injection support 21. 62 is provided. A rod 63 is installed between the front injection support 21 and the rear injection support 62, and the rod 63
Thus, a predetermined distance is maintained between the front injection support 21 and the rear injection support 62. The front injection support 21, the rear injection support 62 and the rod 63 form an injection frame.

At the rear end of the screw 12,
A coupling body 64 having a circular shape is integrally attached via a coupler 59, and a cylindrical support body 65 is attached to the coupling body 64.
Are attached via bolts bt1. The connecting body 64 and the support body 65 constitute a rotary sliding member 68 that rotates integrally with the screw 12. The support body 65 has a length corresponding to the stroke of the screw 12 in the axial direction, and a male spline 67 is formed on the outer peripheral surface thereof.

In order to transmit the rotation to the rotary sliding member 68, adjacent to the rear end of the front injection support 21,
An electric measuring motor 22 as a first drive unit and a rotational force restraining unit is provided integrally with the front injection support 21 and surrounding the rotary sliding member 68. Is placed in the first driving state in the measuring step and in the second driving state in the injection step, rotates the rotary sliding member 68 in the first driving state, and rotates the rotary sliding member in the second driving state. The rotation transmitted to 68 is restricted.

The metering motor 22 is attached to the front injection support 21 via the sleeve 23 fixed to the front injection support 21, the rear annular body 24 attached to the rear end of the sleeve 23, and the sleeve 23. A stator 25 and a cylindrical rotor 26 arranged radially inward of the stator 25 are provided, and a bolt b is provided at the rear end of the rotor 26.
The spline nut 27 is attached by t2.
The stator 25 includes a core 25a attached to the sleeve 23, and a coil 25b wound around the core 25a.
Equipped with. Further, the rotor 26 has a rotary sliding member 68.
A hollow cylindrical body 2 disposed on the same axis line as that and relatively movably in the radial outside of the rotary sliding member 68.
9 and the stator 2 on the outer peripheral surface of the tubular body 29.
5 is provided with a permanent magnet 28 as a flat magnet attached at a position corresponding to 5, and the tubular body 29 functions as an output shaft of the metering motor 22, and the front injection support 21.
On the other hand, the bearing b1 is rotatably supported on the rear annular body 24 by the bearing b2.

In this case, the sleeve 23 and the rear annular body 24 form a case integrally formed with the front injection support 21. Therefore, since the front injection support 21 and the metering motor 22 can be integrated, the injection device can be downsized.

The spline nut 27 allows relative movement of the rotary sliding member 68 in the axial direction,
The rotation generated in the first driving state of the measuring motor 22 is transmitted to the rotary sliding member 68, and the restraining force generated in the second driving state of the measuring motor 22 is rotated. 68, and restrains rotation of the rotary sliding member 68. Therefore, the rotary sliding member 6
8 is non-rotatable with respect to the spline nut 27,
Further, the rotor 26 and the spline nut 27 are arranged so as to be movable in the axial direction, and the outer peripheral surface of the connecting body 64 and the inner peripheral surface of the rotor 26 are slidably brought into contact with each other. That is, at the front end of the tubular body 29, the inner peripheral surface of the tubular body 29 and the outer peripheral surface of the connecting body 64 are slidable via the seal 30 as the first sealing device. Further, at the rear end of the support body 65, the female spline formed on the inner peripheral surface of the spline nut 27 and the male spline 67 are slidably spline-engaged. It should be noted that the female spline and the male spline 67 form a rotation transmitting portion, the female spline forms a first transmitting element, and the male spline 67 forms a second transmitting element.

In this case, since the axial dimension of the spline nut 27 is small and the axial dimension of the male spline 67 is large, when the female spline of the spline nut 27 and the male spline 67 slide, Since the load is always applied to the inner peripheral surface of the nut 27, the wear of the inner peripheral surface of the female spline of the spline nut 27 progresses faster than that of the outer peripheral surface of the male spline 67. However, the spline nut 27 is affected by the bolt bt2. Weighing motor 2
2 is attached to the end of the tubular body 29, that is, the rear end of the tubular body 29, so that the progress of wear can be checked and the spline nut 2
The work for replacing 7 can be simplified.

If a spline is to be formed on the inner peripheral surface of the tubular body 29, the thickness of the tubular body 29 needs to be increased by that amount. However, in the present embodiment, the spline nut 27 is Since it is attached to the rear end of the tubular body 29, the radial dimension of the tubular body 29 can be reduced. Therefore, it is possible to prevent the diameter of the rotor 26 from unnecessarily increasing, and it is possible to reduce the radial dimension of the measuring motor 22. As a result, the rod 63 can be arranged further inside, and the injection device can be downsized.

When the rotor 26 is rotated by driving the measuring motor 22 in the first driving state, the rotation is transmitted to the rotary sliding member 68 via the spline nut 27, and the rotary sliding member 68 is rotated. The member 68 is rotated in the forward direction or the reverse direction as necessary, and the screw 12 is rotated. Further, when the metering motor 22 is placed in the second drive state to generate a restraining force and the rotor 26 is stopped, the rotation transmitted to the rotary sliding member 68 is restrained, and the rotation of the screw 12 is also restrained. It

Further, the rear end of the inner peripheral surface of the rear annular body 24 and the outer peripheral surface of the spline nut 27 are slidably brought into contact with each other via a seal 31 as a second sealing device, and the rear annular body is A first lubricant chamber 32 is formed between 24, the tubular body 29, the bearing b2, and the seal 31, and the first lubricant chamber 32 is filled with, for example, grease as a lubricant. Then, a second lubricant chamber 33 is formed between the tubular body 29, the rotary sliding member 68, the spline nut 27, and the seal 30, and in the second lubricant chamber 33, for example, the grease is Is filled. In the rear annular body 24, a first lubricant supply passage 34 is formed by communicating a lubricant supply source (not shown) with the first lubricant chamber 32, and the tubular body 29 has The first lubricant chamber 3
The second lubricant supply passage 35 is formed by connecting the second lubricant chamber 33 with the second lubricant chamber 33.

In this case, when the female spline and the male spline 67 on the inner peripheral surface of the spline nut 27 are slid, the seal 30 is slid on the smooth inner peripheral surface of the tubular body 29. . Therefore, the second lubricant chamber 33 can be reliably sealed, so that the screw 1
It is possible to prevent the grease from leaking to the 2 side. Further, since the seal 30 is provided at one end of the tubular body 29, that is, the front end, and the spline nut 27 is provided at the rear end, the allowable capacity of the second lubricant chamber 33 can be increased. It is possible to store a sufficient amount of grease in the second lubricant chamber 33. Therefore, it is possible to reliably lubricate between the female spline of the spline nut 27 and the male spline 67.

A ball screw shaft 81 serving as a first conversion element and a ball nut 82 serving as a second conversion element are screwed to the rear of the front injection support 21 (to the right in the drawing). A ball screw 83 is provided as a movement direction conversion unit. The ball screw shaft 8
Reference numeral 1 includes a small-diameter shaft portion 84 that is sequentially formed from the front end to the rear end, a large-diameter screw portion 85, and a connecting portion that is connected to the injection motor 90 as the second driving portion. An annular flange member 89 is externally fitted to the step portion between the shaft portion 84 and the screw portion 85.

The injection motor 90 is fixed to the rear injection support 62 via a load cell 96,
It is driven in the injection process. The injection motor 90 includes a stator and a rotor (not shown), and the rotation generated in the rotor is transmitted to the ball screw shaft 81, while the ball screw 83 is transmitted to the ball screw shaft 81. The rotary motion due to the rotation is converted into the rotary linear motion, and the ball screw shaft 81 is rotated and moved back and forth.

Therefore, the ball screw shaft 81 is supported by bearings b7 and b8 at the front end so as to be rotatable with respect to the rotary sliding member 68 and immovable in the axial direction, and at the center, a ball nut 82. Is rotatably screwed and supported with respect to. That is, the rotary sliding member 68 is arranged so as to be rotatable with respect to the ball screw 83 and immovable in the axial direction. Further, a male screw (not shown) is formed at the front end portion (left end portion in the drawing) of the shaft portion 84, and the bearing nut 80 is arranged by being screwed into the male screw. The bearing nut 8
0 positions the bearing b7 together with the protrusion 65a formed on the inner peripheral surface of the support body 65.

The ball nut 82 is fixed to the rear injection support 62 via the load cell 96. The load cell 96 constitutes a pressure detection device that detects the pressure of the melted resin in the heating cylinder 11.

Therefore, when the rotation generated by driving the injection motor 90 in the forward and reverse directions is transmitted to the ball screw shaft 81 via the connecting portion, the ball screw shaft 81 is Since the screw portion 85 and the ball nut 82 are screwed together, they are moved forward and backward while rotating.

The motion component of the ball screw shaft 81 is composed of a rectilinear motion component for advancing and retracting the ball screw shaft 81 and a rotational motion component for rotating the ball screw shaft 81.
The linear motion component and the rotational motion component are the bearing b.
It is transmitted to the rotary sliding member 68 via 7, b8.

In the injection process and the like, the measuring motor 22 is placed in the second drive state, that is, the rotation restrained state, and the injection motor 90 is placed in the drive state, whereby the rotary sliding member 68 is moved. The transmitted rotation can be restrained and the rotary sliding member 68 can be moved in the axial direction without rotating. As a result, the linear movement is transmitted to the screw 12 integrally attached to the rotary sliding member 68, and the screw 12 can be moved forward (moved leftward in the drawing).

Next, a method of driving the injection device having the above construction will be described.

First, during the weighing process, the weighing processing means of the control unit (not shown) carries out the weighing process, and drives the weighing motor 22 in the first driving state. At this time, the rotation generated in the rotor 26 is generated by the spline nut 2
7 and the rotary sliding member 68 to be transmitted to the screw 12 to rotate the screw 12 in the forward direction.

Along with this, the resin dropped from the hopper (not shown) provided in the heating cylinder 11 is advanced in the groove, and the screw 12 is retracted (moved to the right in the figure) to remove the resin. Stored in front of the screw head. At this time, the rotary sliding member 68 is moved relative to the spline nut 27 and is retracted with the retracting force generated in the screw 12. Further, as the rotary sliding member 68 retracts, the ball screw shaft 81 also rotates and retracts.

During the injection process, the injection processing means of the control section carries out the injection processing and drives the injection motor 90. At this time, the rotation generated in the rotor of the injection motor 90 is transmitted to the ball screw shaft 81 via the connecting portion, and the ball screw 83 converts the rotational movement into the rotational rectilinear movement. As a result, the ball screw shaft 81 is rotated and advanced. Further, the injection processing means,
The metering motor 22 is driven while being placed in a rotation restrained state,
A restraining force is generated by controlling the rotation speed of the rotor 26 to 0 [rpm]. Then, the restraint force is transmitted to the rotary sliding member 68 via the spline nut 27, and the rotation transmitted to the rotary sliding member 68 via the ball screw shaft 81 is restrained. As a result, the screw 12 integrally attached to the rotary sliding member 68 is advanced without rotating.

In this case, the load cell 96 detects the pressure of the resin in the heating cylinder 11, the detection signal is sent to the control section, and the control section performs the filling / holding pressure switching control.

In this way, when the screw 12 is moved forward, the resin stored in front of the screw head is injected from the injection nozzle and filled in the cavity space of the mold device (not shown). At this time, to prevent the resin stored in front of the screw head from flowing backward,
A backflow prevention device (not shown) is arranged around the screw head.

As described above, the rotor 26 is provided with the cylindrical body 29 and the permanent magnet 28, and the rotation generated by driving the measuring motor 22 is directly rotated and slid.
Therefore, a transmission system such as an output gear, a counter drive gear, a counter driven gear, etc. is unnecessary. Therefore, it is possible to prevent the generation of noise due to the meshing of gears and the like, reduce the number of parts, and reduce the cost of the injection device. Also,
Since the space required for disposing the metering motor 22 can be reduced, the injection device can be downsized.

Since the rotor 26 is provided with the permanent magnet 28, it is not necessary to dispose a coil, and the diameter of the tubular body 29 can be increased correspondingly. Therefore, since the diameter of the ball screw shaft 81 can be increased, the ball screw 83 having a large rated capacity can be incorporated, and high load molding can be performed. As a result, not only can the injection device be downsized, but it can also be operated under high-load molding conditions.

At the time of assembling the injection device, at the time of maintenance, etc., the ball screw 83 is incorporated into the injection device together with the support body 65 and the bearings b7 and b8. , The ball screw 83, the support body 65, and the bearings b7, b8 are assembled into the injection device with the spline nut 27 removed, and then the female spline of the spline nut 27 and the male spline 67 are engaged with each other, and then the spline nut 27 Is attached to the rear end of the tubular body 29 with a bolt bt2.

In this case, when the ball screw 83, the support body 65, and the bearings b7 and b8 are incorporated into the injection device, it is not necessary to incorporate the female spline and the male spline 67 in consideration of each other. It is possible to shorten the time required for the assembly, and to improve the ease of assembly and maintenance.

In the present embodiment, the ball screw 83 is used as the movement direction changing portion,
A roller screw may be used instead of the ball screw 83. In that case, the roller screw includes a roller screw shaft as a first conversion element and a roller nut as a second conversion element screwed with the roller screw shaft.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0066]

As described in detail above, according to the present invention, in the injection device, the injection frame, the cylinder member attached to the injection frame, the rotatable inside the cylinder member, and An injection member arranged to move forward and backward,
It has a rotary sliding member attached to the injection member, a stator attached to the injection frame, and a rotor rotatably supported inward in the radial direction of the stator.

The rotor is provided with a hollow cylindrical body arranged so as to be relatively movable outward in the radial direction of the rotary sliding member, and a magnet attached to the cylindrical body.

In this case, since the rotor is provided with the cylindrical body and the magnet and the generated rotation can be directly transmitted to the rotary sliding member, the output gear, the counter drive gear,
A transmission system such as a counter driven gear is unnecessary, and it is possible to prevent noise from being generated due to meshing of gears. Therefore, the number of parts can be reduced, torque loss can be prevented from occurring, and the cost of the injection device can be reduced. Moreover, since the space required for disposing the first drive unit can be reduced, the injection device can be downsized.

Since the rotor is provided with the magnet, it is not necessary to dispose the coil, and the diameter of the cylindrical body can be increased accordingly. Therefore, since the diameter of the motion direction conversion portion can be increased, a motion direction conversion portion having a large rated capacity can be incorporated, and high load molding can be performed. As a result, not only can the injection device be downsized, but it can also be operated under high-load molding conditions.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of an injection device according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a conventional injection device.

[Explanation of symbols]

11 heating cylinder 12 screws 21 Front injection support 22 Measuring motor 23 Sleeve 24 posterior ring 25 stator 26 rotor 28 Permanent magnet 29 tubular 62 Rear injection support 63 rod 68 rotary sliding member 81 Ball screw shaft 82 ball nut 83 ball screw 90 injection motor

Claims (6)

[Claims] 1. An (a) injection frame, (b) a cylinder member attached to the injection frame, and (c) an injection member rotatably and reciprocally arranged in the cylinder member. , (D) a rotary sliding member attached to the injection member, and (e) a stator attached to the injection frame,
(F) a rotor rotatably supported radially inward of the stator, and (g) the rotor is
An injection apparatus comprising: a hollow cylindrical body disposed so as to be relatively movable radially outward of the rotary sliding member, and a magnet attached to the cylindrical body. 2. The injection device according to claim 1, further comprising a case integrally formed with the injection frame. 3. The injection device according to claim 1, wherein the stator and the rotor constitute a first drive unit that rotates the rotary sliding member in a measuring step. 4. The stator and the rotor are configured to move the rotary sliding member in an axial direction in an injection step.
The injection device according to claim 1, which constitutes a drive unit of the injection device. 5. The injection device according to claim 1, further comprising a motion direction conversion unit that converts the rotational motion of the rotation generated in the rotor into a linear motion and transmits the linear motion to the rotary sliding member. 6. (a) The movement direction conversion unit includes first and second conversion elements, and (b) the first conversion element is rotatably supported with respect to the rotary sliding member. The injection device according to claim 1.