JP7246991B2 - injection unit and bracket - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device for injecting a molding material and a plate-like bracket that connects a front side support member and a rear side support member in the injection device.

Among various devices that constitute an injection molding machine, an injection device mainly measures and injects a molding material such as a resin material. Generally, in metering, a screw disposed inside a cylinder is rotated to melt a predetermined amount of molding material and feed it to the tip of the cylinder. In injection, a predetermined amount of molding material sent to the tip of the cylinder is injected into the mold device by advancing the screw. Usually, the screw is then further advanced to apply a required pressure to the molding material in the mold device.

In order to be able to perform the metering and injection operations as described above, in many cases, the injection device is provided with a drive mechanism for driving the screw behind the cylinder in the direction of feeding the molding material in the cylinder. A metering motor and an injection motor are provided. The metering motor and injection motor may each be attached to and supported by, for example, front and rear support members spaced from each other on a slide base. The front support member further supports a cylinder arranged to extend forward.
This type of injection device is described in Patent Document 1 and the like.

Japanese Patent Application Laid-Open No. 2018-69628

By the way, the above-described front side support member and rear side support member may be connected to each other by a plate-like bracket extending in the motor arrangement direction of the metering motor and the injection motor.
If such a bracket is of a simple plate shape such as a flat plate, it will be deformed by the action of the external force from the cover member surrounding it when the injection device is in use, and it will vibrate greatly due to the operation of the injection motor, etc. There is a problem that it causes the occurrence of

An object of the present invention is to solve such problems, and an object thereof is to provide an injection device and a bracket that can effectively suppress deformation and vibration of the bracket.

One injection device capable of solving such problems injects a molding material, and comprises a cylinder to which the molding material is supplied, a screw arranged inside the cylinder, and a drive for driving the screw. a mechanism, a front side support member that supports the cylinder on the front side, a rear side support member that is spaced rearward of the front side support member and supports at least a portion of the drive mechanism; A plate-shaped bracket connecting the side support member and the rear side support member is provided, and the bracket is provided on a main body portion and a side portion of the main body portion, and is bent to protrude from the main body portion. wherein the bracket has a front fixation point fixed to a front support member and a rear fixation point fixed to a rear support member, and the body portion of the bracket includes a front The reinforcement portion is provided on the side of the extension region of the body portion, including a connection region extending between a side fixation point and a rear fixation point, and an extension region extending beyond the rear fixation point. It will be.

Further, one bracket that can solve the above problems is a plate-like bracket that connects a front side support member and a rear side support member in an injection device for injecting molding material, and includes a main body portion and the above-described A front side fixing point fixed to the front side support member and a rear side support member having a reinforcing portion provided on a side portion of the main body portion and protruding by bending with respect to the main body portion. Having a rear fixation point, the body portion of the bracket including a connection region extending between a front fixation point and a rear fixation point, and an extension region extending beyond the rear fixation point, wherein the body includes: The reinforcing portion is provided on the side portion of the extension region of the portion .

According to the injection device and the bracket described above, since the bracket has the reinforcing portion, it is possible to effectively suppress deformation and vibration of the bracket.

1 is a perspective view showing a main part of an injection device according to one embodiment of the present invention; FIG. FIG. 2 is a perspective view of the main part of the injection device of FIG. 1 viewed from a different direction; 2A and 2B are a plan view, a side view, and a front view of the main part of the injection device of FIG. 1; FIG. FIG. 2 is a perspective view of a bracket included in the injection device of FIG. 1; 5 is a plan view, a side view, and a front view of the bracket of FIG. 4; FIG. It is a perspective view which shows the modification of a bracket. FIG. 2 is a cross-sectional view showing the injection device of FIG. 1;

Embodiments of the present invention will be described in detail below with reference to the drawings.
The injection device 1 illustrated in FIGS. 1 to 3 is an injection molding machine or the like mounted on a mounting surface, for example, arranged on a moving device for advancing and retreating the injection device 1, and at least weighing and injecting the molding material. etc. The injection device 1 includes a weighing motor 21 used for weighing the molding material, a front side support member 22 supporting the weighing motor 21 and a cylinder described later, an injection motor 31 used for injecting the molding material, and a front side support member 22. and a rear-side support member 32 that is arranged at a distance on the rear side of and supports the injection motor 31 . The metering motor 21 and the injection motor 31 are included in a driving mechanism for driving screws, which will be described later.

Although the details will be described later, the screw that is rotationally driven by the metering motor 21 and driven forward and backward by the injection motor 31, and the cylinder in which the screw is positioned to send the molding material toward the mold device are: , on the front side (on the right side in FIGS. 1 and 2) of the front side support member 22 in the motor arrangement direction. As shown in FIG. 2, the front side support member 22 is formed with a through hole 22a through which a screw passes.

Here, the direction in which the weighing motor 21 and the injection motor 31, which are spaced apart from each other in the rotation axis direction of the weighing motor 21, are arranged is referred to as the motor arrangement direction. The motor arrangement direction is parallel to the rotation axis direction, the extending direction of the screw and the cylinder, and the direction of feeding the molding material in the cylinder. In the motor arrangement direction, the screw and cylinder side is the front side, and the injection motor 31 side is the rear side. Further, the width direction of the injection device 1 is defined as the direction orthogonal to the motor arrangement direction within a plane parallel to the mounting surface, which is generally a horizontal plane.

(bracket)
The injection device 1 as described above further includes plate-like brackets 41 a and 41 b that connect the front side support member 22 and the rear side support member 32 .

Such brackets 41a and 41b generally extend in the motor alignment direction and are fixed to the front side support member 22 and the rear side support member 32, respectively. By the way, the injection device 1 may further include a cover member (not shown). This cover member is arranged to cover the entirety of the brackets 41a and 41b, the metering motor 21, the injection motor 31, the front support member 22 and the rear support member 32. As shown in FIG. Brackets 41a, 41b may also be secured to such cover members.

4 and 5, the bracket 41a in this embodiment includes a substantially flat plate-shaped main body portion 42 elongated in the motor arrangement direction, and a longitudinal side portion 43a of the main body portion 42 in the longitudinal direction. , 43b and has a reinforcing portion 44 that bends and protrudes with respect to the main body portion 42. As shown in FIG. 4 and 5 show only one bracket 41a, the other bracket 41b has substantially the same shape.

By providing the reinforcing portion 44, the rigidity of the brackets 41a and 41b is increased, so deformation of the brackets 41a and 41b due to the action of external force from the cover member and the like and vibration caused by the operation of the injection motor 31 and the like are prevented. can be effectively suppressed.

In the illustrated example, the reinforcing portions 44 of the brackets 41a and 41b are bent in a direction that is inclined or orthogonal to the main body portion 42 over substantially the entire side portions 43a and 43b of the main body portion 42, and parallel to the main body portion 42. They extend side by side along the motor arrangement direction. By providing the reinforcing portion 44 over a relatively large range of the side portions 43a and 43b of the main body portion 42, the effects of suppressing deformation and vibration of the brackets 41a and 41b can be sufficiently obtained. Such brackets 41a and 41b can be obtained by bending a single metal plate or by joining members corresponding to the main body portion 42 and the reinforcing portion 44 to each other. In this case, the reinforcement portion 44 is formed integrally with the body portion 42 .

As long as the bracket can connect the front side support member 22 and the rear side support member 32, for example, only one wide bracket extending in the width direction of the injection device 1 and extending in the motor arrangement direction can be provided. 1 to 3, a pair of relatively narrow brackets 41a and 41b arranged apart from each other in the width direction of the injection device 1 are used. In this example, the pair of brackets 41a and 41b are positioned on both end sides of the upper surfaces of the front support member 22 and the rear support member 32, respectively. In the following description, one bracket 41a will be mainly described, but the other bracket 41b can also have substantially the same or symmetrical shape or form.

Here, of the side portions 43a and 43b of the main body portion 42, the reinforcing portion 44 of the bracket 41a is composed of the outer portion 43a positioned on the outer side in the width direction of the injection device 1 and the inner portion positioned on the inner side in the width direction. 43b (see FIGS. 3 and 5). By providing the reinforcing portions 44 on both sides of the outer portion 43a and the inner portion 43b of the main body portion 42, it is possible to greatly increase the rigidity compared to the case of providing only one side portion 43a or 43b.

However, it may be desirable to provide the reinforcing portion 44 only on one side portion 43a or 43b for reasons such as avoiding interference with wiring and other parts or members existing around the bracket 41a. In particular, there are many other parts and the like in the vicinity of the inner portion 43b of the body portion 42 of the bracket 41a (that is, between the bracket 41b and the other bracket 41b). Therefore, it is preferable to provide the reinforcing portion 44 of the bracket 41a at least on the outer portion 43a of the body portion 42. As shown in FIG. A bracket 141a exemplified in FIG. 6A has a reinforcement portion 144 only on an outer side portion 143a of a body portion 142, and has substantially the same configuration as the bracket 41a except for this point.

Although illustration is omitted, it is possible to make the protruding length of the outer reinforcing portion from the main body longer than the protruding length of the inner reinforcing portion from the main body. In this case, the rigidity of the bracket can be effectively increased by the reinforced portions of the inner and outer portions while avoiding interference between the reinforced portion and other parts near the inner portion of the main body portion. The protruding length is the distance from the main body to the farthest position of the reinforcing member from the main body in the direction of a vertical line on the flat plate-like main body.

By the way, the main body portion 42 of the bracket 41 a may be provided with a front fixing portion 45 fixed to the front support member 22 and a rear fixing portion 46 fixed to the rear support member 32 . More specifically, the front side fixing point 45 and the rear side fixing point 46 can be, for example, through holes through which bolts pass, but other fixing methods can also be adopted. The front fixing point 45 and the rear fixing point 46 are provided at the position where the front support member 22 and the rear support member 32 exist on the body portion 42 in the motor arrangement direction, respectively. can be done.

With the front side fixing point 45 and the rear side fixing point 46, the body portion 42, as shown in FIG. , and an extension region Ae extending beyond the rear fixing point 46 on the rear side of the rear fixing point 46 in the motor arrangement direction. The front fixing point 45 is positioned near one longitudinal end (the right end in FIG. 5(a)) of the main body portion 42, which is in the shape of an elongated flat plate, while the rear fixing point 46 is located near the main body. It is located inside the other longitudinal end of the portion 42 (the left end in FIG. 5A), more specifically, slightly closer to one end than the center in the longitudinal direction. As a result, the extension region Ae of the main body portion 42 protrudes and extends rearward in the motor arrangement direction from the rear fixing portion 46 .

Here, of the connection area Ac and the extension area Ae of the main body part 42, the reinforcement part 44 is preferably provided at least on the side parts 43a and 43b of the extension area Ae. This extension area Ae of the body portion 42 may be cantilevered on the rear support member 32 at the rear fixation points 46 . By reinforcing such an extension area Ae with the reinforcing portion 44, it is possible to more reliably suppress the occurrence of deformation of the bracket 41a in the extension area Ae on which the weight of the cover member may act. 1 to 5, the reinforcing portion 44 is provided over substantially the entire area of the body portion 42 including the connection area Ac and the extension area Ae.

Here, the portion of the reinforcing portion 44 between the front side fixing point 45 and the rear side fixing point 46, that is, the portion on the side portions 43a and 43b of the connection region Ac of the main body portion 42, is provided from the main body portion 42. It is preferable to provide a cutout portion 47 that shortens the projection length of the other portion. Accordingly, the reinforcing portion 44 can be provided on the bracket 41a without interfering with other parts or the like in the vicinity of the notch portion 47, thereby improving the rigidity.

1 to 5, the notch portion 47 provided in each reinforcing portion 44 of the outer portion 43a and the inner portion 43b extends from a portion closer to one end than the rear fixing portion 46 in the connecting region Ac. The side edge of the reinforcement portion 44 is cut out to one end where the front fixing portion 45 is located. As a result, in the outer portion 43a and the inner portion 43b, the projection length of the reinforcement portion 44 is partially shortened by the notch portion 47 provided between the front side fixing portion 45 and the rear side fixing portion 46. As shown in FIG.

The transition region from the portion of the reinforcing portion 44 having a long protruding length to the notch portion 47 can be a step where the protruding length sharply decreases, as shown in FIG. 5(b). The transition area with the notch portion 47 may be a step difference of two or more steps, like the reinforcing portion 44 on the side of the inner portion 43b (see FIG. 4).
Alternatively, although illustration is omitted, the transition area can be an inclined surface in which the projection length of the reinforcing portion gradually decreases linearly or curvedly. The end portion of the reinforcing portion on the rear side in the motor arrangement direction can also be formed with such an inclined surface.

The brackets can be provided on the side surfaces and/or the bottom surfaces of the front support member 22 and the rear support member 32. It is installed on the top surface. These brackets 41 a , 41 b are thereby located on the metering motor 21 and the injection motor 31 .

In the brackets 41a and 41b, the reinforcing portion 44 protrudes downward toward the weighing motor 21 and the injection motor 31 from the main body portion 42, which has a plate shape or the like and is substantially parallel to the mounting surface. . The direction in which the reinforcement portion 44 bends with respect to the main body portion 42 can be appropriately determined in consideration of the desired rigidity, arrangement of other parts, and other conditions. As shown, it is substantially perpendicular to body portion 42 .

In addition, the brackets 41a and 41b are provided with cover fixing points 48 and the like used for fixing to the cover member, for example, at positions close to the front side fixing point 45 and the rear side fixing point 46 on the main body portion 42, respectively. be able to.

By the way, in the modified bracket 241a shown in FIG. 6(b), the extension region Ae does not substantially exist, and the main body portion consists only of the connection region Ac between the front side fixing point and the rear side fixing point. 242 and a reinforcing portion 244 provided on its side, it has substantially the same configuration as the bracket 41a shown in FIGS. Such a bracket 241a in which the body portion 242 does not have an extension area Ae is also possible.

A bracket 341a shown in FIG. 6(c) has substantially the same configuration as the bracket 41a shown in FIGS. Depending on the arrangement of other parts that may exist around the reinforcing portion 344, the bracket 341a in which the reinforcing portion 344 has no notch 47 and the reinforcing portion 344 has a constant projecting length may be preferable.

(Injection device)
As shown in the cross-sectional view of FIG. 7, the injection device 1 including the brackets 41a and 41b as described above includes, in addition to the brackets 41a and 41b, the metering motor 21, the front side support member 22, and the injection motor 31. and a rear support member 32 . Both the front side support member 22 and the rear side support member 32 are, for example, plate-shaped that are arranged upright in the vertical direction. A weighing motor 21 and an injection motor 31 are attached and supported on the rear surface.

As described above, the front side support member 22 and the rear side support member 32 are connected by brackets 41a and 41b on their upper surface sides. If desired, one or more connecting rods 23 may be provided between the front support member 22 and the rear support member 32 and around the metering motor 21 to connect the front support member 22 and the rear support member 32 . can be provided. In the illustrated example, four connecting rods 23 are provided spaced apart from each other in the circumferential direction of the metering motor 21 .

The injection device 1 illustrated in FIG. 7 further includes a screw 61 which is positioned forward of the front side support member 22 in the motor arrangement direction, is rotationally driven by the metering motor 21, and is driven forward and backward by the injection motor 31; and a cylinder 71 extending forward from the front surface of the front side support member 22 and arranged to surround the screw 61 . The cylinder 71 is supported by the front support member 22 . Therefore, in this example, the front side support member 22 supports the cylinder 71 and the metering motor 21 . The injection device 1 is mounted on a moving device 11, which will be described later, so that the injection device 1 can move forward and backward along the motor arrangement direction (horizontal direction in FIG. 7) with respect to a mold device (not shown). be.

The metering motor 21 is arranged on the rear side of the screw 61 and the cylinder 71 across the front side support member 22 in the motor arrangement direction. , and a stator 21b as a stator disposed around the rotor 21a. A rotor 21a of the metering motor 21 is attached to the screw 61 via a spline. As a result, the rotational driving force is transmitted from the weighing motor 21 to the screw 61 so that the screw 61 can be rotated.

In addition, the injection motor 31 is arranged on the further rear side of the rear side support member 32 positioned on the rear side of the weighing motor 21 in the motor arrangement direction. The injection motor 31 is also mainly composed of a rotor 31a as a rotor inside the stator frame and a stator 31b as a stator arranged around the rotor 31a. It is connected to a drive shaft 33 containing a ball screw coupled to a screw 61 via bearings. With this structure, the rotational driving force of the injection motor 31 is converted into a linear driving force along the motor arrangement direction and transmitted to the screw 61 . Thereby, the screw 61 is moved back and forth by the injection motor 31 .

The cylinder 71 is provided with a supply port 72 to which a hopper for charging and supplying the molding material into the cylinder 71 can be attached on the rear side in the motor arrangement direction and in front of the front side support member 22. A nozzle 73 having a smaller cross-sectional area on the front side is provided at the tip on the front side in the motor arrangement direction. A cooler 74 by water cooling or the like can be provided in the vicinity of the supply port 72 .

A heater 75 is arranged around the cylinder 71 including around the nozzle 73 . The heater 75 is divided into a plurality of heater portions in the axial direction (horizontal direction in FIG. 7), for example, as shown. Each heater section allows the interior of the cylinder 71 inside it to be heated at a different temperature.

A moving device 11 for moving the injection device 1 forward and backward is provided, for example, in the lower part of the injection device 1, and moves the injection device 1 forward and backward with respect to the mold device arranged on the left side of FIG. It includes a drive mechanism. More specifically, the moving device 11 includes a forward/backward drive mechanism, a slide base 12 on which the injection device 1 is mounted and the forward/backward drive mechanism, and a frame Fr placed on the mounting surface Ps. and a linear guide 13 for guiding the linear motion of the slide base 12.

Various mechanisms can be employed as the advance/retreat drive mechanism that constitutes the moving device 11. For example, the moving device 11 includes a hydraulic pump such as a hydraulic pump, a motor, and a piston that is supplied with hydraulic fluid from the hydraulic pump. It can be constructed by a double-acting hydraulic cylinder having a rod or the like.

An injection molding machine equipped with an injection device 1 injects a molding material, which is a resin material such as a thermoplastic resin, into a mold device in a molten state, cools and hardens the molding material in the mold device, and releases it from the mold device. By taking out the molded article, a molded article having a predetermined shape is manufactured.

An example of the molding process by such an injection molding machine will be described. In the latter half of the previous molding process, the mold clamping device is used in a state in which a predetermined amount of molding material has already been weighed and placed inside the injection device 1. Then, a mold clamping process is performed in which the mold device is closed by pressing the mold.

Next, the screw 61 of the injection device 1 is advanced to inject the molding material into the mold device, and the molding material is filled into the cavity in the mold device, and the screw 61 is further advanced to inject. A holding pressure step of holding the molding material inside the tip of the device 1 at a predetermined pressure is sequentially performed.

After that, a cooling step is performed to cool and harden the molding material filled in the mold device to obtain a molded product. At this time, the molding material separately put into the injection device 1 is melted while being fed toward the tip of the cylinder 71 by rotating the screw 61 while being heated by the heater 75, so that a predetermined amount of the molding material is transferred to the tip. A placement weighing process is performed.

After that, the mold clamping device is operated to open the mold device to open the mold, and the ejector device is used to take out the molded product from the mold device.

During the molding process as described above, especially due to the operation of the injection motor 31, the cover member and the like may vibrate. Here, if the rigidity of the plate-like bracket connecting the front side support member 22 and the rear side support member 32 is low, the vibration is amplified and the noise due to the vibration is increased. On the other hand, in this embodiment, by using the brackets 41a and 42b provided with the reinforcing portion 44 that bends and protrudes from the main body portion 42, vibration and noise can be reduced.

REFERENCE SIGNS LIST 1 injection device 11 moving device 12 slide base 13 linear guide 21 metering motor (driving mechanism)
21a rotor 21b stator 22 front support member 22a through hole 31 injection motor (driving mechanism)
31a rotor 31b stator 32 rear support member 33 drive shaft 41a, 41b, 141a, 241a, 341a bracket 42, 142, 242, 342 body portion 43a, 143a, 343a outer portion (side portion)
43b inner part (side part)
44, 144, 244, 344 Reinforcement portion 45, 145 Front fixing point 46, 146 Rear fixing point 47, 147, 247 Notch 48 Cover fixing point
61 Screw 71 Cylinder 72 Supply Port 73 Nozzle 74 Cooler 75 Heater Ps Mounting Surface Ac Connection Area Ae Extension Area Fr Frame

Claims (8)

An injection device for injecting a molding material,
a cylinder to which molding material is supplied;
a screw disposed inside the cylinder;
a drive mechanism for driving the screw;
a front support member that supports the cylinder on the front side;
a rear side support member arranged at a distance behind the front side support member and supporting at least part of the drive mechanism;
A plate-shaped bracket that connects the front side support member and the rear side support member,
the bracket has a main body portion and a reinforcing portion provided on a side portion of the main body portion and protruding by bending relative to the main body portion ;
The bracket has a front fixation point fixed to the front support member and a rear fixation point fixed to the rear support member,
wherein the body portion of the bracket includes a connection region extending between a front fixation point and a rear fixation point, and an extension region extending beyond the rear fixation point;
An injection device in which the reinforcement portion is provided on a side portion of the extension region of the body portion . 2. The injection device according to claim 1, comprising a pair of said brackets spaced apart from each other in the width direction of said injection device. 3. The injection device according to claim 2, wherein each of the pair of brackets has the reinforcing portion on at least an outer side portion of the side portions of the main body portion located outside in the width direction. 4. The reinforcing portion has a notch portion between the front side fixing portion and the rear side fixing portion that shortens the length of protrusion from the main body portion compared to other portions. 1. The injection device according to item 1 . The drive mechanism has a metering motor that is supported by a front side support member and rotates the screw, and an injection motor that is supported by a rear side support member and moves the screw forward and backward,
The injection apparatus according to any one of claims 1 to 4 , wherein the bracket is positioned above the metering motor and the injection motor, and the reinforcing portion of the bracket is provided so as to protrude toward the metering motor and the injection motor. . A plate-shaped bracket that connects a front side support member and a rear side support member in an injection device that injects a molding material,
a main body portion, and a reinforcing portion provided on a side portion of the main body portion and protruding by bending relative to the main body portion ;
Having a front side fixing point fixed to the front side support member and a rear side fixing point fixed to the rear side support member,
wherein the body portion of the bracket includes a connection region extending between a front fixation point and a rear fixation point, and an extension area extending beyond the rear fixation point;
A bracket in which the reinforcement portion is provided on a side portion of the extension region of the body portion . 7. The bracket of claim 6 , having said reinforcing portion on at least one side of the body portion. 8. The reinforcing portion according to claim 6 or 7 , wherein the reinforcing portion has a notch portion between the front side fixing portion and the rear side fixing portion that shortens the length of protrusion from the main body portion compared to other portions. bracket.

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