Molding machine

Abstract

A molding machine according to the present disclosure includes: a cylinder; the feeding unit is constructed to be capable of feeding the raw materials into the barrel; the screw rod is arranged in the cylinder body and can convey the raw materials; and a sensor provided in the feeding unit and configured to be capable of detecting the raw material accumulated inside the feeding unit. The feeding unit includes: a passage through which the raw material passes toward the cylinder; and a protruding portion protruding from a side wall of the channel toward an outside of the channel, and the sensor is provided in at least one of the channel and the protruding portion.

Description

Background Technology

[0001] This disclosure pertains to molding machines.

[0002] International patent application No. WO2017 / 002227 discloses an extruder comprising a barrel with temperature control and a screw rotatably disposed inside the barrel. Raw materials consisting of one of a synthetic resin, a natural resin, and an elastomer, along with a peroxide, are fed separately from a raw material feed hopper into the barrel without premixing. By rotating the screw, the raw materials and peroxide are conveyed downstream, melted, and kneaded, thereby causing them to react with each other. Summary of the Invention

[0003] In the raw material supply hopper, raw material, metered from the feeder, falls freely and is thus fed into the barrel. When the raw material is fed into a narrow space, such as the space between the barrel and the screw, a phenomenon known as feed neck (feed stacking) may occur. In this phenomenon, the raw material cannot smoothly enter the screw space (e.g., the space between multiple screw blades), and the amount of raw material conveyed by the screw becomes less than the amount supplied from the feeder. When feed neck occurs and a starvation state occurs due to insufficient raw material inside the barrel, mechanical failure may occur due to contact between the screws or between the barrel and the screw.

[0004] This disclosure is made to solve this problem, and its purpose is to provide a molding apparatus capable of detecting the appearance of a feed neck at an early stage. Other problems and novel features will become apparent from the description in this specification and accompanying drawings.

[0005] The molding machine according to this disclosure includes: a barrel; a feeding unit configured to feed raw material into the barrel; a screw disposed inside the barrel and capable of kneading and conveying the raw material; and a sensor disposed in the feeding unit and configured to detect raw material accumulated inside the feeding unit.

[0006] According to this disclosure, it is possible to detect the appearance of the feeding neck at an early stage. The above and other objects, features and advantages of this disclosure will become more fully understood from the following detailed description and accompanying drawings. Attached Figure Description

[0007] Figure 1 A schematic construction of an extruder according to a first embodiment is shown; Figure 2 An example of the sensor arrangement in an extruder according to one embodiment is shown; Figure 3The cross-section of the extruder at the sensor placement location in the YZ plane is shown; Figure 4 The cross-section of the connection at the sensor mounting location in the XY plane is shown. Figure 5 Example 1 of the modification of the feeding unit is shown; Figure 6 Example 2 of the modification of the feeding unit is shown; Figure 7 Example 3 of the modification of the delivery unit is shown; Figure 8 A schematic construction of an extruder according to the second embodiment is shown; Figure 9 An example of the arrangement of sensors in the connection section is shown; Figure 10 An example of the sensor arrangement in the connecting part is shown; and Figure 11 An example of the arrangement of sensors in the connection section is shown. Detailed Implementation

[0008] In the following description, the present disclosure will be illustrated by means of embodiments thereof, but the present disclosure according to the claims is not limited to the embodiments shown below. Furthermore, not all components / structures described in the embodiments are indispensable as a means of solving the problem. For clarity, the following description and drawings have been appropriately omitted and simplified. Note that throughout the drawings, the same reference numerals are used for the same elements, and repetitive descriptions are appropriately omitted. Furthermore, in the following description, the positional relationships indicated by the terms "left," "right," "inner," "outer," "axis," "center," "horizontal," and "orthogonal" are based on the positional relationships shown in the drawings, which are intended to facilitate the illustration of the embodiments and should not be construed as limiting the embodiments.

[0009] The embodiments relate to a molding machine for conveying raw materials via a screw disposed inside a barrel (canister). The term "molding machine" includes injection molding machines, extrusion molding machines, and extruders for processing raw materials into granules or sheets. A molding machine can knead molten raw materials by rotating the screw. Note that a molding machine may not knead the raw materials. In the following description, an extruder will be described for processing resin materials such as plastics as raw materials.

[0010] First Embodiment Figure 1 A schematic construction of an extruder according to a first embodiment is shown. The extruder 100 is, for example, a twin-screw extruder. Figure 1As shown, the extruder 100 includes a barrel 10, a screw 11, a reducer 13, a feeding unit 20, and a raw material feeder 30. The extruder 100 is used, for example, in the mixing or volatilization process of resin materials.

[0011] Here, in order to illustrate, Figure 1 An orthogonal XYZ coordinate system was introduced. For example... Figure 1 As shown, the direction in which the barrel 10 extends is defined as the X-axis direction. Furthermore, two directions orthogonal to the X-axis direction are defined as the Y-axis direction and the Z-axis direction. The Z-axis direction is vertical, and the XY plane is horizontal. The +Z-axis direction points upwards, and the direction in which the resin material is extruded by the extruder 100 is defined as the +X-axis direction. Note that the aforementioned vertical and horizontal directions include unavoidable errors relative to precise vertical and horizontal directions that may occur when the extruder 100 is actually installed.

[0012] The cylinder 10 is a cylindrical component extending along the X-axis. The cylinder 10 includes a hollow section inside. Inside the cylinder 10, two screws 11 are arranged adjacent to each other along the Y-axis. A drive unit 12 is located at the end of the cylinder 10 on the X-axis side. The drive unit 12 rotates the screws 11. The drive unit 12 is, for example, a motor. A reducer 13 is disposed between the drive unit 12 and the screws 11. The reducer 13 adjusts the rotation of the drive unit 12 and transmits the adjusted rotation to the screws 11. Therefore, the screws 11 are rotated by the power of the drive unit 12 adjusted by the reducer 13.

[0013] Two screws 11 can be inserted, for example, through an opening at the end of the cylinder 10 along the -X-axis direction. The -X-axis end of the screw 11 extends out of the opening of the cylinder 10 and is connected to the drive unit 12 via a reducer 13. One of the screws 11 rotates about a rotation axis extending along the X-axis direction. Furthermore, the other screw 11 rotates about a rotation axis extending along the X-axis direction at a position adjacent to one screw 11 along the Y-axis direction. These two rotation axes are arranged parallel to each other along the Y-axis direction, with a gap between them. For example, the two screws 11 are not engaged with each other and are capable of rotating in directions different from each other.

[0014] Note that the inner surface of the cylinder 10 may include a cylindrical inner surface that follows the trajectory of rotation along the outer peripheral edges of the two screws 11. For example, the cross-section of the inner surface of the cylinder 10 orthogonal to the X-axis (the cross-section perpendicular to the axial direction) has a figure-eight-like shape, in which two circular portions are connected to each other.

[0015] The feeding unit 20 for feeding resin material is located above the cylinder 10 on the -X-axis side. Figure 1In the example shown, the feeding unit 20 includes a hopper 21 and a connecting portion 22. The hopper 21 may be a collection hopper that collects raw materials supplied from a plurality of raw material feeders 30 and discharges the collected raw materials into the cylinder 10. The connecting portion 22 is a pipe connecting the hopper 21 to the cylinder 10. The hopper 21 and the connecting portion 22 are made of, for example, stainless steel. The inner wall surfaces of the hopper 21 and the connecting portion 22 may be surface-treated to prevent raw materials from accumulating on them.

[0016] The raw material feeder 30 may include, for example, multiple feeders. Figure 1 In the example shown, three feeders are illustrated. Each feeder may include, for example, a hopper 31, a feeding screw (not shown), a feeding motor, etc. Each feeder discharges raw materials toward the feeding unit 20 at a predetermined feed rate according to the selected formula. Note that the raw material feeder 30 is not limited to a screw feeder; known raw material feeders, such as belt feeders or disc feeders, can be used. The feeding unit 20 is capable of receiving a variety of raw materials.

[0017] A discharge port (not shown) is provided at the end of the barrel 10 on the +X axis side, from which the kneaded resin material is discharged. The extruder 100 is capable of kneading multiple materials while heating them, and discharging the kneaded resin material from the discharge port at a predetermined discharge rate.

[0018] Note that in the supply unit 20, the raw material, which is quantitatively supplied from the raw material feeder 30, falls freely and is thus fed into the cylinder 10. When the raw material is fed from the raw material feeder 30 into a narrow space, such as the space between the cylinder 10 and the screw 11, a phenomenon known as feed neck (feed accumulation) occurs. In this phenomenon, the raw material cannot smoothly enter the space of the screw 11 (e.g., the space between multiple blades of the screw), and the amount of raw material conveyed by the screw 11 becomes less than the amount of raw material supplied from the feeder.

[0019] When a feed neck occurs, the extruder 100 may be affected by the following: - This creates a starvation state where the amount of raw material inside the barrel 10 becomes insufficient, causing the extruder 100 to malfunction due to contact between the screws 11 or between the barrel 10 and the screws 11. - When the raw material accumulated in the feeding unit 20 suddenly enters one side of the barrel 10, an overload occurs and the extruder 100 is damaged. When plasticizers and fillers are mixed and kneaded, if plasticizer alone becomes insufficient, only hard filler is supplied to the barrel 10 (filler is sufficient). As a result, the barrel 10 becomes clogged with filler, and the screw 11 stops rotating, thereby damaging the extruder 100. Furthermore, products manufactured under the aforementioned conditions do not meet manufacturing standards and become defective products. Additionally, if the extruder 100 is damaged, time is required for recovery, and production is halted during this period. Therefore, it is desirable to detect feed bottlenecks at an early stage and immediately stop the extruder 100.

[0020] However, it is difficult to directly measure the time derivative of the amount of raw material supplied through the feeding unit 20 (e.g., the amount supplied per unit time, expressed in kg / h) using sensors or the like. Therefore, in this embodiment, a sensor is provided in the feeding unit 20 to detect the accumulation of raw material in the feeding unit 20, which is the accumulation of the supply amount over time. Note that this sensor is not intended to detect blockages in the feeding unit 20, but rather to detect a state where, although the raw material is moving towards the cylinder 10 little by little, it accumulates inside the feeding unit 20 because the amount of raw material conveyed by the screw 11 is less than the amount supplied from the feeder.

[0021] Figure 2 An example of the arrangement of sensors in an extruder 100 according to one embodiment is shown. Figure 3 The cross-section of the extruder 100 at the sensor mounting location on the YZ plane is shown. Figure 4 The cross-section of the connection portion 22 at the sensor mounting location in the XY plane is shown. Note that... Figures 2 to 4 The location of the sensor is shown schematically, but does not represent its actual location precisely. Especially in... Figure 3 In the illustration, the first sensor 40 and the second sensor 50 are shown in an exaggerated manner, pulled to the right / left side.

[0022] exist Figures 2 to 4 In the example shown, it is assumed that two sensors (first sensor 40 and second sensor 50) are provided. Note that the extruder 100 does not necessarily have to include two sensors. The extruder 100 may include only one sensor, or it may include three or more sensors. Here, an example in which both sensors (first sensor 40 and second sensor 50) are arranged in the connecting part 22 will be described.

[0023] The connecting portion 22 includes a channel 22a and a protrusion 22b. The channel 22a allows raw material discharged from the raw material feeder 30 to pass through it toward the cylinder 10. In an embodiment, the channel 22a is a cylindrical pipe. The protrusion 22b protrudes from the side wall of the channel 22a toward the outside of the channel 22a. Specifically, the protrusion 22b protrudes radially toward the outside of the cylindrical channel 22a. That is, the connecting portion 22 has a shape in which the portion with the protrusion 22b extends outward. When a feeding neck occurs, the raw material accumulates inside the channel 22a. Then, when the raw material reaches the position where the protrusion 22b is provided, the raw material enters the protrusion 22b.

[0024] The protrusion 22b includes an inclined portion 22c and a base end portion 22d. In the inclined portion 22c, the length of the protrusion from the sidewall of the channel 22a gradually decreases from the side away from the cylinder 10 towards the side closer to the cylinder 10. The base end portion 22d is located further away from the cylinder 10 than the inclined portion 22c. The angle θ1 between the inclined portion 22c and the horizontal plane is equal to or greater than the angle of repose of the material. In this way, when there is space on one side of the channel 22a for the material to enter, the material that has entered the protrusion 22b slides downward toward the channel 22a without accumulating on the inclined portion 22c.

[0025] The first sensor 40 is disposed in the protrusion 22b. As described above, by disposing of the first sensor 40 in the protrusion 22b, it is possible to prevent raw material falling through the channel 22a from entering the optical axis of the first sensor 40. Figure 2 In the example shown, the first sensor 40 is disposed in the base end 22d of the protrusion 22b, which is located further away from the cylinder 10 than the inclined portion 22c. The first sensor 40 is capable of detecting raw material accumulated inside the connecting portion 22. Note that the first sensor 40 can be disposed at any location in the protrusion 22b, or even in the middle of the inclined portion 22c, as long as it can detect raw material accumulated inside the protrusion 22b.

[0026] As described above, when there is space on one side of channel 22a that allows material to enter, the material that has already entered protrusion 22b slides downward toward channel 22a. Therefore, it is possible to detect material accumulated in protrusion 22b from channel 22a, rather than detecting material that has accidentally entered the optical axis of the first sensor 40. Figures 2 to 4 In the example shown, the first sensor 40 is able to detect the raw material that has been deposited inside the protrusion 22b from one side (i.e., along the X-axis) relative to the direction of material accumulation (i.e., along the Z-axis direction).

[0027] The first sensor 40 can be a transmissive sensor. For example, the first sensor 40 is a transmissive optical sensor including a light projection unit 41 and a light receiving unit 42. The light projection unit 41 emits light such as visible light, infrared light, or laser light. The light receiving unit 42 receives the light emitted from the light projection unit 41. The first sensor 40 uses the light receiving unit to detect changes in the amount of light blocked by a material, which is the object to be detected, and thereby can detect the presence of material between the light projection unit 41 and the light receiving unit 42. Figure 4 As shown, the optical axis of the first sensor 40 may, for example, be parallel to a direction orthogonal to the direction (Z-axis direction) extending from the connecting portion 22.

[0028] Furthermore, the first sensor 40 can be a penetrating ultrasonic sensor, which emits ultrasonic waves from a transmitter toward the object to be detected, and receives the ultrasonic waves that have passed through the object to be detected by a receiver, thereby detecting the presence / absence of the material and the distance to the material. Note that the first sensor 40 is not limited to a penetrating ultrasonic sensor, and alternatively, it can be a penetrating sensor that uses electromagnetic waves (such as visible light or infrared light) as the sensing medium.

[0029] The second sensor 50 is located in channel 22a. For example... Figure 2 As shown, the second sensor 50 is capable of detecting raw materials accumulated inside the channel 22a from a direction inclined at a predetermined angle θ2 to the direction extending from the channel 22a. The second sensor 50 can be a reflective sensor. The second sensor 50 can be a reflective optical sensor, which detects the raw material by reflecting light incident on it, the raw material being the object to be detected. The reflective optical sensor includes a projection / receiving unit that integrates a projection unit and a receiving unit, and detects the raw material by light reflected from the object to be detected.

[0030] Furthermore, the second sensor 50 can be a reflective ultrasonic sensor that emits ultrasonic waves toward the object to be detected and receives the ultrasonic waves reflected from the surface of the object, thereby measuring the time required for light to travel across space to reach the object and make a round trip. Thus, the second sensor 50 can detect the presence / absence of the material and the distance to the material.

[0031] The first sensor 40 and the second sensor 50 are not limited to the examples described above. The first sensor 40 may be a reflective sensor, and the second sensor may be a transmissive sensor. Furthermore, for example, the first sensor 40 and the second sensor 50 may include capacitive sensors, fiber optic sensors, Hall effect sensors, or any other sensors capable of detecting the presence of an object without any physical contact with it. The first sensor 40 and the second sensor 50 may, for example, be a camera that photographs raw materials piled inside the connector 22. Alternatively, the first sensor 40 and the second sensor 50 may be sensors capable of detecting an object by physical contact with it.

[0032] As described above, according to this embodiment, the feed neck can be detected at an early stage by detecting the raw material accumulated inside the connecting portion 22. When the feed neck is detected, the extruder 100 can execute control to generate an alarm via an alarm output device (not shown). For example, the alarm output device includes at least one of a display device, a buzzer, and a warning light. By generating an alarm, the operator's attention can be drawn.

[0033] Furthermore, when a feed neck is detected, the extruder 100 can perform various types of control, such as stopping the screw 11, changing the rotational speed of the screw 11, changing the temperature of the barrel 10, changing the pressure at the tip of the screw 11, and changing the amount of raw material to be supplied. In this way, damage to the extruder 100 due to a feed neck can be prevented.

[0034] Note that although in the example above, the first sensor 40 is disposed in the protrusion 22b and the second sensor 50 is disposed in the channel 22a, the construction of the feeding unit, etc., is not limited to this example. The sensor may be disposed in at least one of the channel 22a and the protrusion 22b.

[0035] (Modified Example 1) Figure 5 Example 1 of a modification to the delivery unit 20 is shown. Figure 5 In the example shown, the connecting part 22 is not provided, and the hopper 21 is directly connected to the cylinder 10. The hopper 21 has a generally frustum-shaped cone with openings at its top and bottom. The raw material passes through the hopper 21 from its top side to its bottom side. That is, in Figure 5 In the example shown, a hopper 21 with a generally frustum-shaped cone serves as a "channel" through which the raw material passes. The hopper 21 includes a protrusion 23. The shape of the protrusion 23 is similar to that shown in the reference above. Figures 2 to 3 The shape of the protrusion 22b is similar to that described, and therefore its description will be omitted. A sensor similar to the first sensor 40 may be provided in the protrusion 23. Furthermore, a sensor similar to the second sensor 50 may be provided on the side wall of the hopper 21.

[0036] (Modified Example 2) Figure 6 This illustrates a modified example 2 of the delivery unit 20. Figure 6 In the example shown, the connecting part 22 is not provided, and the hopper 21 is directly connected to the cylinder 10. The hopper 21 has a generally frustum shape with its top and bottom open. The raw material passes through the hopper 21 from its top side to its bottom side. That is, in Figure 6 In the example shown, the roughly trapezoidal hopper 21 serves as a "channel" through which the raw material passes. The hopper 21 includes a protrusion 23. The shape of the protrusion 23 is similar to that shown in the reference above. Figures 2 to 3 The shape of the protrusion 22b is similar to that described, and therefore its description will be omitted. A sensor similar to the first sensor 40 may be provided in the protrusion 23. Furthermore, a sensor similar to the second sensor 50 may be provided on the side wall of the hopper 21.

[0037] (Modified Example 3) Figure 7 Example 3 of a modification to the delivery unit 20 is shown. Figure 7 In the example shown, hopper 21 is not provided, and raw material feeder 30 is directly connected to connector 22. Connector 22 is a cylindrical pipe. Note that the shape of connector 22 is not limited to a cylindrical shape. For example, connector 22 can have a rectangular shape.

[0038] Second Embodiment Figure 8 A schematic configuration of an extruder according to a second embodiment is shown. The extruder 100 is a twin-screw extruder equipped with a side feeder 60. (As shown...) Figure 8 As shown, the cylinder 10 is equipped with a side feeder 60. The hopper 21 located near one end of the cylinder 10 corresponds to the "main feeding unit".

[0039] A side feeder 60 is located downstream of the hopper 21 within the cylinder 10. The side feeder 60 is, for example, a screw-type material supply device connected to an opening in the side surface of the cylinder 10. The side feeder 60 includes, for example, a cylinder 63, which is arranged orthogonally to the direction in which the cylinder 10 extends and is located on the same horizontal plane as the cylinder 10. A screw (not shown) is disposed inside the cylinder 63. The side feeder 60 pushes raw material discharged from the raw material feeder (not shown) into the cylinder 10 from one side. That is, the side feeder 60 can supply additional raw material to the molten resin being conveyed through the cylinder 10 from the middle of the cylinder 10. The side feeder 60 includes a feeding unit 61 and a protrusion 62. The raw material fed from the feeding unit 61 is conveyed towards the cylinder 10 via a screw inside the cylinder 63. The conveyed raw material is added to the molten resin inside the cylinder 10 from the connection between the cylinder 63 and the cylinder 10. The feeding unit 61 corresponds to a "sub-feeding unit". A sensor is provided in at least one of the main feeding unit and the sub-feeding unit.

[0040] For example, a sensor similar to the first sensor 40 can be disposed in the protrusion 23. Furthermore, a sensor similar to the second sensor 50 can be disposed on the side wall of the hopper 21.

[0041] The shape of the protrusion 62 is the same as the one above. Figures 2 to 3 The protrusion 22b is similar in description, and therefore its description will be omitted. A sensor similar to the first sensor 40 may be provided in the protrusion 62. Furthermore, a sensor similar to the second sensor 50 may be provided on the side wall of the feeding unit 61.

[0042] (Example of sensor placement) Figure 9 An example of the sensor arrangement in the connection section 22 is shown. Figure 9 In the example shown, in addition to the first sensor 40, a third sensor 43 is disposed in the protrusion 22b. The third sensor 43 detects the material accumulated inside the protrusion 22b from above along the direction of material accumulation. The third sensor 43 can be a reflective sensor or a capacitive sensor.

[0043] In addition to the second sensor 50, a fourth sensor 51 is disposed in the channel 22a. The fourth sensor 51 detects the material from a direction orthogonal to the direction extending from the channel 22a (e.g., the X-axis direction). The fourth sensor 51 may be, for example, a transmissive sensor. Note that the fourth sensor 51 is not limited to a transmissive sensor, and alternatively, may be a reflective sensor or a capacitive sensor.

[0044] Note that, as Figure 10 As shown, the third sensor 43 can be tilted at a predetermined angle θ3 from the direction extending from the channel 22a so as to detect the material piled up inside the channel 22a from above along the direction of material accumulation. This disclosure is not limited to the above embodiments and can be appropriately modified without departing from the scope and spirit of this disclosure. For example, the shape of the protrusion 22b is not limited to... Figure 2 The shape shown. (As shown) Figure 11 As shown, the inclined portion 22c can be provided along the entire length of the protrusion 22b from the side away from the cylinder 10 to the side near the cylinder 10. That is, in Figure 11 In this configuration, no base end 22d is provided in the protrusion 22b. The first sensor 40 can be located anywhere in the protrusion 22b, as long as it can detect the material accumulated inside the protrusion 22b.

[0045] These embodiments can be appropriately combined with each other. The accompanying drawings are merely examples for illustrating the embodiments. Each drawing is not necessarily associated with only one specific embodiment, but may also be associated with other embodiments. As those skilled in the art will understand, the various features described above with reference to any one of the drawings can be combined with features shown in other drawings to form embodiments not explicitly described herein. Furthermore, not all features shown in any one drawing are indispensable, and some features may be omitted. As will be apparent from the present disclosure as described herein, embodiments of the present disclosure may vary in many ways. Such variations should not be considered as departing from the spirit and scope of the present disclosure, and all such modifications, which will be obvious to those skilled in the art, are considered to be included within the scope of the following claims.

Claims

1. A molding machine, comprising: cylindrical body; The feeding unit is configured to feed raw materials into the cylinder; A screw is disposed inside the cylinder and is capable of conveying raw materials; as well as A sensor is located in the feeding unit and configured to detect raw materials accumulated inside the feeding unit.

2. The molding machine according to claim 1, wherein, The feeding unit includes: Channel through which raw materials are conveyed toward the cylinder; and The protrusion protrudes from the side wall of the channel toward the outside of the channel, and The sensor is disposed in at least one of the channel and the protrusion.

3. The molding machine according to claim 2, wherein, The protrusion includes an inclined portion, in which the length of the protrusion from the sidewall toward the outside gradually decreases from the side away from the cylinder to the side closer to the cylinder, and The sensor is disposed in the protrusion.

4. The molding machine according to claim 2, wherein, The sensor includes a first sensor disposed in the protrusion, and The first sensor detects the raw materials from above or from the side along the direction of the raw material accumulation.

5. The molding machine according to claim 4, wherein, The first sensor detects the raw material accumulated inside the protrusion.

6. The molding machine according to claim 4, wherein, The first sensor detects raw materials accumulated inside the channel.

7. The molding machine according to claim 4, wherein, The first sensor, which detects raw materials from the side, is a penetrating sensor.

8. The molding machine according to claim 2, wherein, The sensor includes a second sensor disposed in the channel, and The second sensor detects the material from a direction that is tilted at a predetermined angle relative to the extension direction of the channel or from a direction orthogonal to the extension direction of the channel.

9. The molding machine according to claim 8, wherein, The second sensor, which detects the raw material from a direction orthogonal to the extension direction of the channel, is a penetrating sensor.

10. The molding machine according to claim 2, wherein, The sensor includes: The first sensor, which is disposed in the protrusion, and The second sensor is disposed on the side wall of the channel.

11. The molding machine according to claim 1, wherein, The feeding unit includes: The main feeding unit for raw materials; and A sub-feeding unit, located downstream of the main feeding unit, is configured to feed raw materials into the cylinder. The sensor is disposed in at least one of the main feeding unit and the sub-feeding unit.

12. The molding machine according to claim 2, wherein, The feeding unit is a collection hopper, which is configured to collect raw materials discharged from multiple feeders and discharge the collected raw materials into the cylinder. The protrusion is provided on the side wall of the collection hopper.

13. The molding machine according to claim 2, wherein, The feeding unit is a connection between the collecting hopper and the cylinder. The collecting hopper is configured to collect raw materials discharged from multiple feeders and discharge the collected raw materials into the cylinder. The protrusion is provided on the connecting portion.

14. The molding machine according to claim 3, wherein, The angle formed between the inclined portion and the horizontal plane is equal to or greater than the angle of repose of the raw material.

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