JP2016215473A - Screw for injection molding, injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw for injection molding which has simple and compact structure (so-called, feederless screw) and can perform injection molding of a constant amount of a raw material without comprising a raw material supply device and achieves low power consumption.SOLUTION: The screw for injection comprises: a constant amount transferring section 5a for transferring a constant amount of a charged raw material 13; a supplying section 5b for continuously supplying the transferred raw material; a compressing section 5c for plasticizing the supplied raw material; and a measuring section 5d for measuring the plasticized raw material. The constant amount transferring section, the supplying section, the compressing section, and the measuring section are composed of screw bodies 33, 34, 35, and 36 rotating around a straight axis 16, and flights 37, 38, 39, and 40 spiraling along outer circumferential surfaces 33s, 34s, 35s, and 36s of the screw bodies, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an injection molding screw (that is, a feeder-less screw) capable of injection molding of a certain amount of raw material without providing a raw material supply device, and an injection molding machine including the screw.

  An injection molding system in which a raw material supply device is externally attached to an injection molding machine is known (see, for example, Patent Document 1). According to the injection molding system, in the raw material supply apparatus, a certain amount of raw material is supplied to the injection molding machine as the feed screw rotates. In an injection molding machine, injection molding is performed on a certain amount of raw material supplied. That is, the injection molding screw is rotated. The raw material is conveyed forward while being plasticized by the rotation of the screw. The screw is moved backward by being pushed by the conveyed material. When the screw moves back to the measurement completion position, the rotation is stopped. In this state, the screw is advanced. As a result, the plasticized raw material is injected.

JP-A-9-225964

  By the way, in the above-described injection molding system, when performing injection molding on a certain amount of raw material, it is necessary to synchronize the feed screw and the injection molding screw. For example, it is necessary to synchronize the rotation state (the number of rotations and the rotation speed) between the feed screw and the injection molding screw. However, in order to meet such a demand, a device and a circuit for synchronizing (synchronizing) both screws are separately required. As a result, as the number of devices and circuits increases, the entire system becomes more complex or larger, and the power consumption also increases.

  An object of the present invention is to provide an injection molding screw and an injection molding machine having a simple and compact configuration that enables injection molding of a certain amount of raw material without providing a raw material supply device, and enables low power consumption. There is to do.

  In order to achieve such an object, the present invention includes a quantitative transfer unit that quantitatively transfers an input raw material, a supply unit that continuously supplies the transferred raw material, and a compression that plasticizes the supplied raw material. And a weighing unit for weighing the plasticized raw material. Each of the fixed-quantity transfer unit, the supply unit, the compression unit, and the weighing unit is configured by a screw body that rotates about a linear axis, and a flight that is spirally twisted along the outer peripheral surface of the screw body. .

  According to the present invention, an injection molding screw and an injection molding machine having a simple and compact configuration that enable injection molding of a certain amount of raw material without providing a raw material supply device and enable low power consumption are realized. can do.

Sectional drawing which shows the structure of an injection molding machine in the injection molding system which concerns on one Embodiment of this invention. Sectional drawing which shows the state which the screw retracted | retreated to the measurement completion position in the injection molding machine of FIG. The perspective view which shows the external appearance structure of the injection molding machine of FIG. The top view which shows the other structure of the screw of FIG. The top view which expands and shows partially the structure of a fixed quantity transfer part and a supply part in the screw of FIG. Sectional drawing which shows the structure of the vent mechanism provided in the injection molding machine of FIG. Sectional drawing which shows the other structure of the vent mechanism of FIG. Sectional drawing which shows the other structure of the vent mechanism of FIG. FIG. 7 is a perspective view showing a state in which a vent member is incorporated in a vent port in the vent mechanism of FIG. 6. The perspective view which shows the state which incorporated the vent member in the vent port in the vent mechanism of FIG. The perspective view which shows the structure of the vent mechanism which concerns on a 1st modification, partially in cross section. Sectional drawing which follows the F12-F12 line | wire of FIG. Sectional drawing which decomposes | disassembles and shows the structure of the vent mechanism of FIG. Sectional drawing of the vent mechanism which concerns on a 2nd modification. Sectional drawing of the vent mechanism which concerns on a 3rd modification. FIG. 16 is a perspective view showing a part of the configuration of the vent mechanism in FIG. 15. Sectional drawing of the vent mechanism which concerns on a 4th modification. The perspective view of the vent mechanism which concerns on a 5th modification. In the vent mechanism of FIGS. 1-18, the schematic diagram for pinpointing the tolerance | permissible_range of the direction of an exhaust passage.

"One embodiment"
“Outline of injection molding system”
As shown in FIGS. 1 to 3, the injection molding system includes an injection molding machine 1, a suction device 2, an air purge device 3, and a vent abnormality detection device 4. Note that the suction device 2, the air purge device 3, and the vent abnormality detection device 4 can be components of the injection molding machine 1. Further, the injection molding machine 1 includes an injection molding screw 5 (hereinafter referred to as a screw 5), a barrel 6, a vent mechanism 7, a heating device 8, and a cooling device 9.

  The barrel 6 includes a cylinder 10 having a hollow cylindrical inner peripheral surface 10s. The cylinder 10 extends straight along the barrel 6. At the base end of the barrel 6, a charging port 12 to which a hopper 11 is connected is provided. The insertion port 12 is configured to penetrate from the outer surface 6 s of the barrel 6 to the inner peripheral surface 10 s of the cylinder 10. The insertion port 12 is provided at a position facing a quantitative transfer unit 5a described later.

  With this configuration, the raw material 13 supplied to the hopper 11 can be input into the cylinder 10 through the input port 12. On the other hand, a nozzle 14 communicated with the cylinder 10 is provided at the tip of the barrel 6. The nozzle 14 is configured to be able to inject plasticized raw material by a screw 5 described later. According to such a configuration, the plasticized raw material can be injected out of the cylinder 10 (for example, a mold) through the nozzle 14.

A screw 5 is rotatably inserted into the cylinder 10. The screw 5 extends straight from the proximal end toward the distal end. A coupling 15 is provided at the base end of the screw 5. A rotational movement device (not shown) can be connected to the coupling 15.
According to this configuration, in a state where the screw 5 is inserted into the cylinder 10, the screw 5 can be rotated about the linear axis 16 and can be moved along the axis 16 by the rotational movement device. .

  In the state where the screw 5 is inserted into the cylinder 10, the base end of the screw 5 (screw main bodies 33 to 36 described later) is positioned on the base end side of the barrel 6 and the screw 5 (screw main bodies 33 to 36). ) Is positioned on the tip side of the barrel 6. In this case, the base end of the screw 5 coincides with the base ends of the screw bodies 33 to 36, and the distal end of the screw 5 coincides with the distal ends of the screw bodies 33 to 36.

  Furthermore, the rotation direction (left rotation, right rotation) of the screw 5 (screw main bodies 33 to 36) is the rotation direction (left rotation, right rotation) when viewed from the base end side of the screw 5 and the barrel 6. . Similarly, the twist direction (clockwise, counterclockwise) of the flight is the twist direction (clockwise, counterclockwise) when viewed from the base end side of the screw 5 and barrel 6.

  The screw 5 includes a fixed quantity transfer unit 5a, a supply unit 5b, a compression unit 5c, and a weighing unit 5d. In the screw 5, a quantitative transfer unit 5 a, a supply unit 5 b, a compression unit 5 c, and a metering unit 5 d are arranged in order from the base end to the tip end of the barrel 6 (screw 5). Here, the fixed quantity transfer part 5a is comprised so that the raw material 13 thrown in from the insertion port 12 can be quantitatively transferred. The supply part 5b is comprised so that the conveyed raw material 13 can be supplied continuously. The compression part 5c is comprised so that plasticity of the supplied raw material 13 is possible. The measuring unit 5d is configured to be able to measure the plasticized raw material 13. The details of the screw 5 will be described later.

  The barrel 6 is provided with a heating device 8 for heating the barrel 6. As the heating device 8, for example, a heater 17 can be applied. The heater 17 is disposed along the outer surface 6 s of the barrel 6. By causing the heater 17 to generate heat, the barrel 6 can be heated.

  The heating device 8 (heater 17) may be provided in the barrel 6 in the range excluding the fixed amount transfer unit 5a among the fixed amount transfer unit 5a, the supply unit 5b, the compression unit 5c, and the weighing unit 5d, or the fixed amount transfer unit 5a. You may provide in the barrel 6 at least in the range of the fixed quantity transfer part 5a among the transfer part 5a, the supply part 5b, the compression part 5c, and the measurement part 5d. In the drawing, as an example, a heating device 8 (heater 17) is provided in the barrel 6 facing the fixed amount transfer unit 5a, the supply unit 5b, the compression unit 5c, and the metering unit 5d.

  In this case, for the heating device 8 (heater 17) in the range of the quantitative transfer unit 5a, the operation and stop timing may be freely set. This makes it possible to control the heating device 8 (heater 17) so that all the raw materials 13 are uniformly plasticized before being transported to the weighing unit 5d.

  The barrel 6 is provided with a cooling device 9 for cooling the barrel 6. As the cooling device 9, for example, a cooling water passage 18 can be applied. The cooling water passage 18 is piped around the cylinder 10. Cooling water can flow through the cooling water passage 18. The barrel 6 can be cooled by flowing cooling water along the cooling water passage 18. The cooling device 9 can be provided in the barrel 6 at least in the range of the quantitative transfer unit 5a among the quantitative transfer unit 5a, the supply unit 5b, the compression unit 5c, and the metering unit 5d. In the drawing, as an example, a cooling device 9 is provided in the barrel 6 facing the fixed amount transfer unit 5a, the supply unit 5b, the compression unit 5c, and the measurement unit 5d.

  According to this configuration, the heater 17 is controlled to heat the barrel 6 to the set temperature. Thereby, the inside of the cylinder 10 can be heated. Here, when the barrel 6 exceeds the set temperature, the barrel 6 is cooled by flowing cooling water through the cooling water passage 18. Thereby, the inside of the cylinder 10 can be cooled to the set temperature.

  Further, the barrel 6 is provided with a vent mechanism 7. The vent mechanism 7 is configured to be able to exhaust gas components (for example, gas, air, other volatile components) generated in the cylinder 10 to the outside of the cylinder 10. Details of the vent mechanism 7 will be described later.

  A suction device 2, an air purge device 3, and a vent abnormality detection device 4 are connected to the vent mechanism 7. One end of a common pipe 19 is connected to the vent mechanism 7. The other end of the common pipe 19 is connected to the branch pipe 20. Two dedicated pipes (first pipe 21 and second pipe 22) are connected to the branch pipe 20. The suction device 2 and the vent abnormality detection device 4 are provided in the first pipe 21. The air purge device 3 is provided in the second pipe 22.

  In the first pipe 21, the suction device 2 includes a vacuum pump 23, a first flow rate adjustment valve 24, a first electromagnetic switching valve 25, and a first drain separator 26. The vent abnormality detection device 4 includes a flow meter 27 and a pressure gauge 28. The first pipe 21 may be provided with a monomer coagulating device or a deodorizing device, although not particularly shown.

  In the second pipe 22, the air purge device 3 includes an air source 29, a second drain separator 30, a second flow rate adjustment valve 31, and a second electromagnetic switching valve 32. The first and second drain separators 26 and 30 are configured to prevent foreign matters such as water from entering the vacuum pump 23 and the air source 29, for example.

  In such a configuration, when pulling the inside of the cylinder 10 to a negative pressure, for example, the operation of the air source 29 is stopped. The second electromagnetic switching valve 32 is closed. The first electromagnetic switching valve 25 is opened. The first flow rate adjusting valve 24 is adjusted. The vacuum pump 23 is operated. At this time, the suction force of the vacuum pump 23 is transmitted from the first pipe 21 through the common pipe 19 to the vent mechanism 7. Thereby, the inside of the cylinder 10 can be pulled to a negative pressure. As a result, the gas component generated in the cylinder 10 can be exhausted from the vent mechanism 7.

  During this time, for example, the flow value and the pressure value detected by the flow meter 27 and the pressure gauge 28 are displayed and monitored on an external monitor (not shown) in real time. When these values are abnormal (that is, when a preset allowable value is not satisfied), the fact is notified (warned). At this time, the operation of the vacuum pump (suction device 2) may be stopped. Thereby, the stability and reliability of evacuation with respect to the inside of the cylinder 10 can be improved.

  Further, when air purge is performed, for example, the operation of the vacuum pump 23 is stopped. The first electromagnetic switching valve 25 is closed. The second electromagnetic switching valve 32 is opened. The second flow rate adjustment valve 31 is adjusted. The air source 29 is operated. At this time, the pressure of the air source 29 is transmitted from the second pipe 22 through the common pipe 19 to the vent mechanism 7. Thereby, clogging of the vent mechanism 7 (exhaust passage to be described later) can be removed by air pressure. Here, the air purge can be performed in synchronization with the timing of stopping the vacuuming. For example, after injecting the plasticizing raw material from the nozzle 14 of the injection molding machine 1, the air purge can be performed in synchronization with the timing when the molded product is removed.

  Note that at the base end of the barrel 6, the base end of the screw 5 and the inner peripheral surface 10s of the cylinder 10 may be sealed (sealed) or may not be sealed (sealed). In the drawing, as an example, a configuration without sealing (sealing) is shown. When sealing (sealing), for example, a seal structure (not shown) may be disposed so as to cover the gap between the base end of the screw 5 and the inner peripheral surface 10s of the cylinder 10. Here, in the case of sealing (sealing), outside air flows into the cylinder 10 from the hopper 11 through the inlet 12 when evacuating the cylinder 10. On the other hand, when sealing (sealing) is not performed, outside air flows into the cylinder 10 through a gap between the hopper 11 (input port 12) and the base end of the screw 5 and the inner peripheral surface 10s of the cylinder 10.

"Operation of injection molding system"
In a state where the inside of the cylinder 10 is pulled to a negative pressure through the vent mechanism 7, the screw 5 is rotated. At this time, the screw 5 rotates in a state in which its tip is brought close to the nozzle 14. Here, when the raw material 13 (for example, pellets) is supplied to the hopper 11, the raw material 13 is charged into the cylinder 10 through the charging port 12.

  The input raw material 13 is quantitatively transferred by the quantitative transfer unit 5a. The transferred raw material 13 is continuously supplied by the supply unit 5b. The supplied raw material 13 is plasticized by the compression part 5c. That is, in the compressing unit 5 c, the raw material 13 is compressed while being heated by the heater 17, thereby becoming a molten raw material 13 (plasticized raw material). Subsequently, the plasticized raw material is conveyed to the tip of the screw 5 through the measuring unit 5d.

  At this time, the screw 5 is moved backward by being pushed by the plasticizing raw material 13s conveyed to the tip of the screw 5 (see FIG. 2). During this time, a back pressure is applied to the screw 5. When the screw 5 moves backward to the measurement completion position, the rotation of the screw 5 is stopped. At this time, the plasticizing raw material 13s necessary for making one molded product is stored in the cylinder 10 (see FIG. 2). The measurement completion position is not particularly limited here because it is set according to the purpose and application of injection molding. At this time, a suck back is performed. That is, the screw 5 is slightly retracted after the completion of measurement. Thereby, the raw material leakage from the nozzle 14 can be prevented.

Next, the non-rotating screw 5 is advanced toward the nozzle 14. As a result, the plasticized raw material 13s stored in the cylinder 10 can be injected outside the cylinder 10 (for example, a mold). Subsequently, the mold is cooled. Thereafter, the desired molded product can be obtained by demolding.
In addition, in the injection | pouring, the distance which retreats the screw 5 from the position (refer FIG. 1) close | similar to the nozzle 14 to a measurement completion position (refer FIG. 2) is hereafter called "stroke length."

“About Screw 5”
As shown in FIGS. 1, 2, and 5, in the screw 5, the fixed amount transfer unit 5 a, the supply unit 5 b, the compression unit 5 c, and the measurement unit 5 d are respectively a screw main body 33, 34, 35, 36 and a flight. 37, 38, 39, 40. The flights 37, 38, 39, and 40 are configured to be spirally twisted along the outer peripheral surfaces 33s, 34s, 35s, and 36s of the screw bodies 33, 34, 35, and 36. Details of the flights 37, 38, 39, and 40 will be described later.

"Configuration of screw bodies 33-36"
Screw main body 33-36 (screw 5) is comprised so that an above-described rotational movement apparatus may be connected with the base end. The screw main bodies 33 to 36 (screw 5) extend straight along the linear axis 16 described above from the base end to the tip end. The screw bodies 33 to 36 (screws 5) are configured concentrically around the axis 16. The fixed quantity transfer part 5a, the supply part 5b, the compression part 5c, and the measurement part 5d are arranged in order from the base end to the front end of the screw bodies 33 to 36 (screw 5). According to this configuration, the screw main bodies 33 to 36 (screw 5) can be rotated about the axis 16 by the rotational movement device in a state where the screw main bodies 33 to 36 (screw 5) are inserted into the cylinder 10. At the same time, it can move along the axis 16.

  More specifically, the screw bodies 33 to 36 include the first screw body 33 in the fixed amount transfer unit 5a, the second screw body 34 in the supply unit 5b, the third screw body 35 in the compression unit 5c, and the measuring unit 5d. And a fourth screw main body 36. The first screw body 33, the second screw body 34, and the fourth screw body 36 have cylindrical outer peripheral surfaces 33s, 34s, and 36s. The third screw body 35 has an outer peripheral surface 35 s that is widened toward the fourth screw body 36 from the second screw body 34. That is, the outer peripheral surface 35s of the third screw body 35 has a truncated cone shape.

  The passing dimension (for example, diameter) of the second screw body 34 is set to be smaller than the passing dimension (for example, diameter) of the fourth screw body 36. In other words, the passing dimension (diameter) of the fourth screw body 36 is set larger than the passing dimension (diameter) of the second screw body 34. According to this configuration, when the screw bodies 33 to 36 (screws 5) are inserted through the cylinder 10, the gap between the outer peripheral surface 36s of the fourth screw main body 36 and the inner peripheral surface 10s of the cylinder 10 is the second screw. It is narrower than the gap between the outer peripheral surface 34 s of the main body 34 and the inner peripheral surface 10 s of the cylinder 10.

  The passing dimension (for example, diameter) of the third screw main body 35 is set so as to continuously increase from the second screw main body 34 toward the fourth screw main body 36. According to this configuration, when the screw bodies 33 to 36 (screws 5) are inserted through the cylinder 10, the gap between the outer peripheral surface 35s of the third screw main body 35 and the inner peripheral surface 10s of the cylinder 10 is the second screw. From the main body 34 toward the fourth screw main body 36, the width is continuously reduced.

  The passing dimension (for example, diameter) 33d of the first screw body 33 is set larger than the passing dimension (diameter) 34d of the second screw body 34. In other words, the delivery dimension (diameter) 34d of the second screw body 34 is set smaller than the delivery dimension (diameter) 33d of the first screw body 33. According to such a configuration, in a state where the screw bodies 33 to 36 (screw 5) are inserted through the cylinder 10, the gap between the outer peripheral surface 33s of the first screw main body 33 and the inner peripheral surface 10s of the cylinder 10 is the second screw. It is narrower than the gap between the outer peripheral surface 34s of the main body 34 and the inner peripheral surface 10s of the cylinder 10 (see FIG. 5).

  The length along the direction of the axis 16 of the first screw body 33 is set so that the quantitative transfer section 5a does not come off from the position facing the charging port 12 even if the screw 5 is retracted by the “stroke length” described above. ing. In other words, the length along the direction of the axis 16 of the first screw body 33 is set so that the insertion port 12 does not enter the supply unit 5b even if the screw 5 moves backward by the above-mentioned “stroke length”. .

  Here, the passing dimension (diameter) of the screw 5 is defined as a diameter dimension including the outermost diameter of the flights 37, 38, 39, 40. The passing dimension (diameter) of the screw 5 is set to a constant (same) diameter dimension throughout the whole including the fixed quantity transfer section 5a, the supply section 5b, the compression section 5c, and the measuring section 5d. In this case, assuming that the passing dimension (diameter) of the screw 5 is D, the length of the first screw main body 33 along the direction of the axis 16 has the above-mentioned “stroke length” as a lower limit and the “stroke length”. It is preferable that the length is set by adding “a value in the range of 0.5D to 2D”.

  According to such a configuration, while the screw 5 is retracted from the position close to the nozzle 14 (see FIG. 1) to the measurement completion position (see FIG. 2), the input port 12 is always in a range facing the fixed quantity transfer unit 5a. Positioned. Thereby, all the raw material 13 thrown into the cylinder 10 through the inlet 12 from the hopper 11 is supplied to the fixed quantity transfer part 5a without leaking. As a result, the input raw material 13 can be quantitatively and stably transferred to the supply unit 5b.

"Composition of flights 37, 38, 39, 40"
The flights 37, 38, 39, and 40 are configured to continuously convey the raw material 13 put into the cylinder 10 in the order of the quantitative transfer unit 5a, the supply unit 5b, the compression unit 5c, and the measurement unit 5d. Yes. The flights 37 to 40 are spirally twisted in the same direction. For example, the twist direction of the flights 37 to 40 may be set clockwise as in the case of the right screw, or may be set in the counterclockwise direction as in the case of the left screw.

  As an example, the drawings show flights 37-40 twisted clockwise. In this case, the rotation direction of the screw bodies 33 to 36 (screw 5) may be set counterclockwise (left rotation) about the axis 16. When the flights 37 to 40 are twisted counterclockwise, the rotation direction of the screw bodies 33 to 36 (screw 5) may be set clockwise (right rotation) about the axis 16.

  More specifically, in the fixed amount transfer section 5a, a first flight 37 that is spirally twisted is provided on the outer peripheral surface 33s of the first screw body 33. The twist direction of the first flight 37 is set clockwise as in the case of the right-hand thread. In other words, the first flight 37 is twisted in the direction opposite to the rotation direction of the first screw body 33 (screw 5). The twist pitch 37p of the first flight 37 is constant.

  In the supply unit 5b, a second flight 38 that is spirally twisted is provided on the outer peripheral surface 34s of the second screw body 34. The twist direction of the second flight 38 is set clockwise as in the case of the right-hand screw. In other words, the second flight 38 is twisted in the direction opposite to the rotation direction of the second screw body 34 (screw 5). The twist pitch 38p of the second flight 38 is constant.

  In the compression part 5c, the outer periphery 35s of the 3rd screw main body 35 is provided with the 3rd flight 39 twisted helically. The twist direction of the third flight 39 is set clockwise as in the case of the right-hand screw. In other words, the third flight 39 is twisted in the direction opposite to the rotation direction of the third screw body 35 (screw 5). The twist pitch of the third flight 39 is constant.

  In the measuring portion 5d, a fourth flight 40 that is spirally twisted is provided on the outer peripheral surface 36s of the fourth screw body 36. The twist direction of the fourth flight 40 is set clockwise as in the case of the right-hand screw. In other words, the fourth flight 40 is twisted in the direction opposite to the rotation direction of the fourth screw body 36 (screw 5). The twist pitch of the fourth flight 40 is constant.

  It is preferable that the twist pitches of the first to fourth flights 37 to 40 described above are set to be the same. In this case, in the supply part 5b, you may provide the subflight 38a along the pitch of the 2nd flight 38. FIG. Thereby, the twist pitch of the flights 38a, 38 in the supply unit 5b can be set to, for example, half (1/2) the twist pitch of the other flights 37, 39, 40 (FIG. 1, FIG. 2, FIG. 5).

  Furthermore, the first to fourth flights 37 to 40 have a flight width in the direction along the axis 16. The flight width refers to the thickness along the direction of the axis 16 of the first to fourth flights 37 to 40. In this case, the flight widths (thicknesses) of the first to fourth flights 37 to 40 may be set to be the same or different from each other. In the drawing, as an example, the flight width (thickness) 37w of the first flight 37 is set larger than the flight width (thickness) 38w of the second flight 38 (see FIG. 5).

"About the effect of screw 5"
According to the screw 5 of the present embodiment, as the first specification, the passing dimension (diameter) 33d of the first screw body 33 is set larger than the passing dimension (diameter) 34d of the second screw body 34. Alternatively, as the second specification, the flight width (thickness) 37w of the first flight 37 is set larger than the flight width (thickness) 38w of the second flight 38. And as a 3rd specification, both above-mentioned 1st specification and 2nd specification are applied simultaneously. Thereby, the raw material 13 thrown into the cylinder 10 can be quantitatively and stably transferred to the supply unit 5b by the quantitative transfer unit 5a. As a result, it is possible to perform injection molding of a certain amount of raw material without separately providing a raw material supply device.

  Furthermore, according to the screw 5 of this embodiment, the fixed quantity transfer part 5a which has a function as a raw material supply apparatus can be integrated with one screw 5 with the supply part 5b, the compression part 5c, and the measurement part 5d. it can. In this case, the same effect as that of the raw material supply device is exhibited in the quantitative transfer unit 5a only by rotating the screw 5. As a result, power consumption can be reduced by the amount that the raw material supply device is no longer required, and a compact size around the injection molding machine 1 can be realized.

"Other configurations of screw 5"
The screw bodies 33 to 36 may be configured as an integrated body that is continuous with each other, or may be configured as an assembly that is divided into a plurality of parts. FIG. 4 shows screw bodies 33 to 36 relating to the assembly as an example. That is, the screw main bodies 33 to 36 have a first main body and a second main body that are divided into two in the direction crossing the axis 16. The divided portion is set between the quantitative transfer unit 5a and the supply unit 5b.

  The first main body is configured to have a quantitative transfer section 5a (first screw main body 33, first flight 37). An end surface 33f of the first screw main body 33 is formed in the divided portion of the first main body. On the other hand, the second body includes a supply unit 5b (second screw body 34, second flight 38), a compression unit 5c (third screw body 35, third flight 39), and a weighing unit 5d (fourth screw body 36, second flight). 4 flights 40). An end surface 34f of the second screw main body 34 is formed in the divided portion of the second main body.

  A connecting mechanism for connecting the first main body and the second main body so as to be split is provided at a divided portion of the first main body and the second main body. That is, the connection convex part 41 is provided in the division | segmentation part (end surface 34f) of the 2nd main body. A stopper 42 is provided on the connecting convex portion 41. The stopper 42 is configured to be able to project and retract with respect to the connecting convex portion 41. On the other hand, a connecting concave portion 43 into which the connecting convex portion 41 can be inserted is provided in the divided portion (end surface 33f) of the first main body. The connection recess 43 is provided with an engagement region (not shown). The engaging region is configured such that the stopper 42 can be engaged when the connecting convex portion 41 is inserted into the connecting concave portion 43.

  According to such a configuration, the connecting convex portion 41 of the first main body is inserted into the connecting concave portion 43 of the second main body. At the time of insertion, the stopper 42 is retracted into the connecting convex portion 41. When the connecting convex portion 41 is completely inserted into the connecting concave portion 43, the stopper 42 is engaged with the engaging region by its own biasing force (elastic force). At this time, the connection convex part 41 and the connection recessed part 43 are connected in the state stopped. Thereby, the 1st main part and the 2nd main part are integrated in the state where rotation was stopped. As a result, one screw 5 in which the quantitative transfer unit 5a, the supply unit 5b, the compression unit 5c, and the measurement unit 5d are connected is configured.

  When the first main body and the second main body are divided, the stopper 42 is pressed from the outside and retracted into the connecting convex portion 41. Thereby, the connection convex part 41 can be extracted from the connection concave part 43. As a result, the first main body and the second main body can be divided.

  According to such a split type screw 5, for example, the flight width (thickness) 37 w of the first flight 37 of the quantitative transfer unit 5 a can be reduced only by changing the configuration of the first main body (quantitative transfer unit 5 a). It is possible to freely change the feed amount of the raw material to be quantitatively transferred from the quantitative transfer unit 5a to the supply unit 5b only by changing.

  In this case, it is preferable to prepare a plurality of first bodies (quantitative transfer units 5a) having different configurations. Thereby, the feed amount of the raw material can be changed easily and in a short time only by selecting the first main body according to the purpose and application and combining it with the second main body. Furthermore, it is possible to design, manufacture, and manage the first main body (quantitative transfer unit 5a) independently of the configuration of the second flight 38 of the supply unit 5b. Thereby, the freedom degree of the combination of the 1st main part with respect to a 2nd main body can be improved.

  Although not particularly illustrated, instead of setting a divided portion between the quantitative transfer unit 5a and the supply unit 5b, the divided unit may be set within the range of the supply unit 5b. Furthermore, although the structure of the screw 5 divided into two is shown in the drawing as an example, the screw 5 may be divided into three or more instead.

  In addition, as the above-described connection mechanism, for example, a male screw part and a female screw part may be applied instead of the connection convex part 41 and the connection concave part 43. The male screw portion is configured by cutting a male screw on the outer periphery of a shaft (not shown). The shaft is provided in a divided portion (end surface 34f) of the second main body. The male screw is cut in the direction opposite to the direction of rotation of the screw 5. On the other hand, the internal thread portion is configured by cutting an internal thread on the inner periphery of a hole (not shown). The hole is provided in a divided portion (end surface 33f) of the first main body. The female screw is cut in the direction opposite to the direction of rotation of the screw 5.

  In such a connecting mechanism, the first main body and the second main body can be integrated with each other by screwing the male screw portion into the female screw portion. As a result, it is possible to configure one screw 5 in which the quantitative transfer unit 5a, the supply unit 5b, the compression unit 5c, and the measurement unit 5d are connected. According to such a configuration, even when a load is applied to the coupling mechanism when the screw 5 is rotated, the male screw portion and the female screw portion of the reverse screw structure are not loosened from each other. Note that when the first main body and the second main body are divided, the male screw portion and the female screw portion may be relatively rotated in the reverse direction.

“Arrangement of vent mechanism 7”
As shown in FIGS. 1 to 3, the arrangement of the vent mechanism 7 is a barrel in a range facing the supply unit 5 b among the barrels 6 facing the quantitative transfer unit 5 a, the supply unit 5 b, the compression unit 5 c, and the weighing unit 5 d. 6 is preferably set to be provided. Specifically, the position where the vent mechanism 7 is provided is that of the barrel 6 in the range of the barrel 6 facing the supply unit 5b in a state where the screw 5 is moved to the tip of the barrel 6 along the axis 16 at the time of injection. It is preferable to set the portion closest to the base end. In addition, plasticization of the raw material 13 has started in the part near the front-end | tip of the barrel 6 among the supply parts 5b. For this reason, when the vent mechanism 7 is provided in the said part, it is easy to produce a vent up phenomenon.

  Here, as described above, in a state where the screw bodies 33 to 36 (screw 5) are inserted through the cylinder 10, the gap between the outer peripheral surface 33s of the first screw main body 33 and the inner peripheral surface 10s of the cylinder 10 (hereinafter, The first clearance) is narrower than the clearance between the outer peripheral surface 34s of the second screw body 34 and the inner peripheral surface 10s of the cylinder 10 (hereinafter referred to as the second clearance). In other words, the 2nd clearance gap of the supply part 5b is wider than the 1st clearance gap of the fixed quantity transfer part 5a.

  According to such a configuration, the raw material 13 quantitatively transferred through the first gap by the quantitative transfer unit 5a spreads into the second gap wider than the first gap when being introduced into the supply unit 5b. At this time, the raw material 13 is dispersed over the entire second gap of the supply unit 5b. In other words, a spatial gap in which the raw material 13 does not exist is formed in the second gap. In this case, a spatial gap in which the raw material 13 does not exist is formed in the cylinder 10 of the barrel 6 facing at least the position where the vent mechanism 7 is provided. Thus, only the gas component generated in the cylinder 10 can be efficiently exhausted outside the cylinder 10 through the vent mechanism 7 without causing a vent-up phenomenon. As a result, the exhaust performance can be kept constant over a long period of time.

“Internal structure of vent mechanism 7”
As shown in FIGS. 1 and 6 to 10, the vent mechanism 7 is covered with a cover member 44. A passage 45 is formed through the cover member 44. One end of the common pipe 19 is connected to the passage 45. In this case, one end of the common pipe 19 may be directly connected to a passage 54 formed in the support member 50 described later. Further, the vent mechanism 7 includes a vent port 47, a vent member 48, and an exhaust path constituting portion 49.

"Configuration of vent port 47"
The vent port 47 is provided in the barrel 6 in a range facing the supply portion 5b corresponding to the arrangement of the vent mechanism 7 described above. Specifically, the position where the vent port 47 is provided is the barrel 6 in the range of the barrel 6 facing the supply unit 5b in a state where the screw 5 is moved along the cylinder 10 to the tip of the barrel 6 at the time of injection. It is set to the part closest to the base end of

  The vent port 47 is configured to penetrate from the outer surface 6 s of the barrel 6 to the inner peripheral surface 10 s of the cylinder 10. As the inner contour of the vent port 47, for example, a rectangle (square, rectangle, trapezoid, etc.), an ellipse, a triangle, a circle, or the like can be applied. In the drawing, a vent port 47 having a rectangular inner contour is shown as an example.

  The vent port 47 extends in parallel with the inner peripheral surface 10s of the cylinder 10 along the direction in contact with the inner side. Specifically, the barrel 6 is arranged so that the cylinder 10 is orthogonal to the gravity direction 46g. In such a state, the highest position of the inner peripheral surface 10s of the cylinder 10 along the gravity direction 46g is defined as an angle of 0 ° to an angle of 360 °. In this case, the vent port 47 is disposed so as to be in contact with the inner peripheral surface 10s of the cylinder 10 from the inside in an angle range of 0 ° to 135 ° or an angle range of 225 ° to 360 ° (see FIG. 19).

  Here, the vent port 47 is preferably configured to extend along a direction opposite to the rotation direction of the screw 5. Accordingly, of the plurality of vent ports 47 shown in FIG. 19, the two vent ports 47 illustrated in the range of the angle 225 ° to 360 ° extend along the same direction as the rotation direction of the screw 5. . Therefore, these vent ports 47 are not suitable for the internal configuration of the vent mechanism 7. However, if the direction of these two vent ports 47 is reversed in the direction opposite to the direction of rotation of the screw 5, the internal structure of the vent mechanism 7 is qualified. FIG. 19 shows the arrangement of the vent member 48 incorporated in the vent port 47.

"Configuration of vent member 48"
The vent member 48 has an outer shape along the inner contour of the vent port 47. In the case of the vent port 47 having the rectangular inner contour described above, the vent member 48 has a rectangular outer shape. The vent member 48 has one end surface 48a and the other end surface 48b facing each other. One end surface 48a of the vent member 48 has a flat surface shape. The other end surface 48 b of the vent member 48 has a curved surface shape that matches the curvature of the inner peripheral surface 10 s of the cylinder 10.

  The vent member 48 is configured to be removably incorporated into the vent port 47. According to such a configuration, the end surface 48 a of the vent member 48 is supported by the support member 50 in a state where the vent member 48 is incorporated in the vent port 47. The support member 50 is fixed to the outer surface 6s of the barrel 6 by a fixing member 51 such as a bolt or a screw. At this time, the one end surface 48 a of the vent member 48 is positioned on the same plane as the outer surface 6 s of the barrel 6. At the same time, the other end surface 48 b of the vent member 48 is positioned on the same curved surface as the inner peripheral surface 10 s of the cylinder 10.

  In this case, it is preferable to add alignment marks 52 to both the vent port 47 and the vent member 48. In the drawing, as an example, a mark 52 is added to the outer surface 6 s near the vent port 47 and one end surface 48 a of the vent member 48. According to such a configuration, the vent member 48 is incorporated in the vent port 47 so that both the marks 52 face each other. Thereby, the other end surface 48b of the vent member 48 can be positioned on the same curved surface as the inner peripheral surface 10s of the cylinder 10 easily and accurately. As a result, it is possible to prevent the vent member 48 and the screw 5 inserted into the cylinder 10 from interfering with each other.

  In addition, when the direction of assembling the vent member 48 with respect to the vent port 47 is wrong, the other end surface 48 b of the vent member 48 protrudes from the inner peripheral surface 10 s of the cylinder 10. Thereby, the projecting vent member 48 interferes with the screw 5 inserted into the cylinder 10. As a result, one or both of the vent member 48 and the screw 5 are damaged.

“Configuration of Exhaust Path Component 49”
At least one exhaust path component 49 is provided in the vent member 48. In the drawing, as an example, a vent member 48 having a plurality of exhaust passage constituting portions 49 is shown. The exhaust path constituting portion 49 is configured to penetrate from the outer surface 6 s of the barrel 6 to the inner peripheral surface 10 s of the cylinder 10 in a state where the vent member 48 is incorporated in the vent port 47. At this time, the exhaust passage configuration portion 49 is configured as a hollow exhaust passage 53 for exhausting a gas component generated in the cylinder 10. In such a configuration, the exhaust passage 53 can communicate with the outside through the passage 54 formed in the support member 50 described above.

  The exhaust path component 49 can be provided on the side surface or inside the vent member 48. In this case, the exhaust path constituting portion 49 can be provided on the side surface of the vent member 48 by partially denting the side surface of the vent member 48. As a method of partially denting the side surface, for example, a method of notching or scraping off the side surface can be applied. Further, by forming a hole through the vent member 48, the exhaust path constituting portion 49 can be provided inside the vent member 48. As a method of forming the hole, for example, a method of drilling the vent member 48 with a drill can be applied.

  FIG. 6 shows an exhaust passage configuration portion 49 configured along one side surface of the vent member 48. On the other hand, the side surface is disposed along a tangential plane of the cylinder 10 (inner peripheral surface 10s). FIG. 8 shows an exhaust path configuration portion 49 configured along the other side surface facing the one side surface. FIG. 7 shows an exhaust passage configuration portion 49 configured to penetrate the inside of the vent member 48.

  In such a configuration, according to the exhaust path forming portion 49 provided on the side surface of the vent member 48, the vent port 47 is surrounded by the inner side surface of the vent port 47 and the exhaust path forming portion 49 when the vent member 48 is incorporated in the vent port 47. A hollow exhaust path 53 can be formed along the range. In addition, the exhaust path structure part 49 inside the vent member 48 can be configured as a hollow exhaust path 53 as it is.

  In this case, it is preferable to set the passing dimension (that is, hole diameter) of the hollow hole as the exhaust passage 53 in a range of 1.0 to 2.0 mm. Thereby, the hole diameter of the exhaust path 53 can be set smaller than the raw material 13 in the cylinder 10. As a result, when pulling the inside of the cylinder 10 to a negative pressure through the vent mechanism 7, it is possible to prevent the raw material 13 from being exhausted together with the gas component generated in the cylinder 10. The number of exhaust passages 53 is not particularly limited here because it is set based on the exhaust amount according to the purpose of use.

“Extension direction of exhaust passage 53”
The angle formed by the extending direction of the exhaust passage 53 and the radial direction of the cylinder 10 is preferably set in a range of 0 ° to 90 °, not including 0 °, and including 90 °. In this case, the extending direction of the exhaust passage 53 is preferably set to a direction orthogonal to the gravity direction 46g or a direction opposite to the gravity direction 46g. As the most preferable specification, the extending direction of the exhaust passage 53 is a direction in which the vent port 47 is in contact with the inner peripheral surface 10s of the cylinder 10 from the inside, and coincides with the direction opposite to the rotational direction 5R of the screw 5. Is preferred. 6 to 8 show such a most preferable specification.

“Effects of internal structure of vent mechanism 7”
According to the vent mechanism 7 described above, during the rotation of the screw 5, the rotational motion can be exerted in a direction in which the raw material 13 that has entered the exhaust passage 53 is scraped out from the exhaust passage 53. Thereby, it is possible to prevent the exhaust passage 53 from being clogged by the raw material 13 while the inside of the cylinder 10 is being pulled to a negative pressure. As a result, the exhaust performance can be kept constant over a long period of time.

  Furthermore, according to the vent mechanism 7 described above, the passing dimension (hole diameter) of the exhaust passage 53 can be set smaller than the raw material 13 in the cylinder 10. As a result, when pulling the inside of the cylinder 10 to a negative pressure through the vent mechanism 7, it is possible to prevent the raw material 13 from being exhausted together with the gas component generated in the cylinder 10.

  Furthermore, according to the vent mechanism 7 described above, by providing the exhaust member 49 in the vent member 48, the exhaust passage 53 can be easily cleaned and maintained. In other words, by removing the vent member 47 from the vent port 47, the exhaust path constituting portion 49 can be exposed to the outside. Cleaning and maintenance of the exposed part can be performed very easily.

  Furthermore, according to the vent mechanism 7 described above, by providing the exhaust member 49 in the vent member 48, the hollow exhaust passage 53 can be formed easily and in a short time simply by incorporating the vent member 48 into the vent port 47. Can be configured. In such a configuration, the portions other than the exhaust passage 53 are kept sealed by the fitting of the vent member 48 and the vent port 47. Thereby, the inside of the cylinder 10 can be efficiently pulled to a negative pressure.

“Vent mechanism 7 according to first modification”
In the above-described embodiment, the configuration in which the vent member 48 is inserted into the vent port 47 is applied. Instead, as shown in FIGS. 11 to 13, the vent member 48 is formed of the barrel 6 and the fixed block 55. You may comprise so that it may pinch | interpose between. In this case, the fixed block 55 can be configured by cutting a part of the barrel 6. As an example, the drawing shows a fixed block 55 having the same dimensions as the exhaust passage configuration portion 49.

  According to the first modification, the vent member 48 can be incorporated into the vent port 47 while confirming the orientation and arrangement of the vent member 48 with respect to the barrel 6 (the inner peripheral surface 10s of the cylinder 10). The vent port 47 can be formed between the fixed block 55 and the barrel 6. Other configurations and effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

"Vent mechanism 7 according to second modification"
In the above-described embodiment, a configuration in which the tip of the vent member 48 (the other end surface 48b) is tapered along the curvature of the inner peripheral surface 10s of the cylinder 10 is applied. As described above, the tip of the other end surface 48b of the vent member 48 may be cut halfway.

  According to the 2nd modification, in the vent member 48, a weak part can be decreased. Thereby, the durability of the vent member 48 can be improved. Other configurations and effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

“Vent mechanism 7 according to third modification”
In the above-described embodiment, the configuration in which the tip of the vent member 48 (the other end surface 48b) is tapered along the curvature of the inner peripheral surface 10s of the cylinder 10 is applied. As shown in FIG. 16, the vent member 48 may be formed in a rectangular parallelepiped shape.

  According to the third modification, the entire other end surface 48 b of the vent member 48 does not protrude from the inner peripheral surface 10 s of the cylinder 10. Thereby, the restriction | limiting of the assembly direction of the vent member 48 with respect to the vent port 47 can be eliminated. Other configurations and effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

“Vent Mechanism 7 According to Fourth Modification”
In the above-described embodiment, the exhaust passage 53 constituted by the exhaust passage constituting portion 49 on one side surface of the vent member 48 has been described, but instead, on both side surfaces of the vent member 48 as shown in FIG. The exhaust passage configuration portion 49 may be configured along the same.

  According to the fourth modification, by incorporating the vent member 48 into the vent port 47, a plurality of exhaust passages 53 can be arranged in parallel on both sides of the vent member 48. Thereby, exhaust performance can be improved. Other configurations and effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

"Vent mechanism 7 according to fifth modification"
In the above-described embodiment, the vent port 47 and the vent member 48 having a rectangular outline are applied. Instead, as shown in FIG. 18, the vent port 47 and the vent member 48 having a circular outline are applied. May be. In this case, the vent port 47 has a hollow cylindrical shape. The vent member 48 has a cylindrical shape that can be inserted into the vent port 47. The exhaust path constituting portion 49 is provided along the peripheral surface of the vent member 48 with a space therebetween.

  According to the fifth modification, the vent member 48 can be inserted into the vent port 47 from any direction of 360 °. Thereby, a some exhaust path can be comprised along the circumferential direction. Other configurations and effects are the same as those of the above-described embodiment, and thus description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 ... Injection molding machine, 2 ... Suction device, 5 ... Screw for injection molding, 5a ... Fixed quantity transfer part,
5b ... supply unit, 5c ... compression unit, 5d ... metering unit, 6 ... barrel, 7 ... vent mechanism,
8 ... heating device, 9 ... cooling device, 10 ... cylinder, 13 ... raw material, 16 ... axis,
33, 34, 35, 36 ... screw body, 33s, 34s, 35s, 36s ... outer peripheral surface,
37, 38, 39, 40 ... Flight.

Claims (12)

A quantitative transfer section for quantitatively transferring the input raw materials;
A supply unit for continuously supplying the transferred raw material;
A compression section for plasticizing the supplied raw material;
A weighing unit for weighing the plasticized raw material,
The quantitative transfer unit, the supply unit, the compression unit, and the metering unit are respectively
A screw body that rotates about a straight axis;
An injection molding screw comprising: a flight that is spirally twisted along an outer peripheral surface of the screw body. The screw body extends along the axis from the base end to the tip connected to a rotational movement device that rotates and moves the screw body along the axis.
The screw for injection molding according to claim 1, wherein the fixed amount transfer unit, the supply unit, the compression unit, and the metering unit are arranged in order from the base end to the tip end of the screw main body.   The screw for injection molding according to claim 1, wherein a passing dimension of the screw main body in the quantitative transfer unit is set larger than a passing dimension of the screw main body in the supply unit.   2. The injection molding according to claim 1, wherein a flight width in the direction along the axis of the flight in the fixed quantity transfer unit is set larger than a flight width in the direction along the axis of the flight in the supply unit. Screw for use. In the quantitative transfer section, the twist pitch of the flight is constant,
The screw for injection molding according to claim 1, wherein a twist pitch of the flight is constant in the supply unit. The screw body has a plurality of bodies divided in a direction crossing the axis,
The screw for injection molding according to claim 1, wherein a connecting mechanism for connecting the plurality of main bodies so as to be split is provided at the divided portions of the plurality of main bodies.   The screw for injection molding according to claim 6, wherein the divided portion is set within a range of the supply unit.   The screw for injection molding according to claim 6, wherein the divided portion is set between the quantitative transfer section and the supply section. An injection molding machine comprising the injection molding screw according to any one of claims 1 to 8,
A barrel having a cylinder inserted through the injection molding screw so as to be rotatable and movable along the axis;
Provided in the barrel, and an inlet for introducing the raw material into the cylinder;
An injection molding machine provided with a nozzle for injecting a plasticized material provided in the barrel. A heating device for heating the barrel;
10. The injection molding machine according to claim 9, wherein the heating device is provided in the barrel in a range excluding the fixed amount transfer unit among the fixed amount transfer unit, the supply unit, the compression unit, and the metering unit. . A heating device for heating the barrel;
10. The injection molding machine according to claim 9, wherein the heating device is provided in the barrel at least in the range of the quantitative transfer unit among the quantitative transfer unit, the supply unit, the compression unit, and the metering unit. A cooling device for cooling the barrel;
10. The injection molding machine according to claim 9, wherein the cooling device is provided in the barrel at least in the range of the quantitative transfer unit among the quantitative transfer unit, the supply unit, the compression unit, and the metering unit.

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