Detection device and detection method

Abstract

To provide a detection device and a detection method capable of easily discriminating an abnormality occurrence place of an injection molding device.SOLUTION: The detection device 2 according to the present disclosure includes an acceleration information acquisition unit 21, an acceleration abnormality detection unit 22, and an output unit 23. The acceleration information acquisition unit 21 acquires acceleration information of the plunger during the injection operation. The acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger in the injection direction and the direction perpendicular to the injection direction based on the acceleration information. The output unit 23 outputs abnormality detection information on the drive mechanism of the plunger when the acceleration abnormality detection unit 22 detects the acceleration abnormality in the injection direction and does not detect the acceleration abnormality in the direction perpendicular to the injection direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a detection device and a detection method. [Background technology]

[0002] Patent Document 1 describes a method for determining the degree of seizing of an injection plunger mechanism of a die-casting machine. The method described in Patent Document 1 determines the degree of seizing of the plunger by measuring the movement stroke or movement time of the plunger. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 02-032066 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, in the detection method described in Patent Document 1, the degree of seizing of the plunger is determined by measuring the movement stroke or movement time of the plunger. However, the abnormality that affects the ejection of the plunger is not limited to galling. For example, an abnormality in the plunger drive mechanism or the like also affects the ejection of the plunger. Patent Document 1 does not disclose any technology for easily determining the location of various abnormalities that affect the ejection of the plunger.

[0005] The present disclosure has been made to solve such problems, and aims to provide a detection device and a detection method that can easily identify an abnormality location. [Means for solving the problem]

[0006] The detection device according to the present disclosure includes an acceleration information acquisition unit, an acceleration abnormality detection unit, and an output unit. The acceleration information acquisition unit acquires acceleration information of the plunger during an injection operation. The acceleration abnormality detection unit detects an acceleration abnormality of the plunger in the injection direction and a direction perpendicular to the injection direction based on the acceleration information. The output unit outputs abnormality detection information related to the plunger drive mechanism when the acceleration abnormality detection unit detects an acceleration abnormality in the injection direction but does not detect an acceleration abnormality in the direction perpendicular to the injection direction.

[0007] With this configuration, when an abnormality occurs in the plunger drive mechanism, the detection device according to the present disclosure can detect the position where the abnormality has occurred, and in other words, with this configuration, the detection device according to the present disclosure can easily identify the location of the abnormality.

[0008] In the detection device according to the present disclosure, when the acceleration abnormality detection unit detects an acceleration abnormality in a direction perpendicular to the injection direction, the output unit may output abnormality detection information relating to the sliding mechanism of the plunger. With this configuration, when an abnormality occurs in the sliding mechanism of the plunger, the detection device according to the present disclosure can detect the position of the abnormality as well. In other words, with this configuration, the detection device according to the present disclosure can more accurately identify the abnormality location.

[0009] In the detection device according to the present disclosure, the acceleration information acquisition unit may acquire acceleration information from a sensor attached to the plunger, and if the absolute value of the acceleration is smaller than a predetermined value, the output unit may output abnormality detection information related to the sensor. With this configuration, the detection device according to the present disclosure can appropriately detect an abnormality in the sensor, thereby reducing the likelihood of overlooking an abnormality.

[0010] In the detection device according to the present disclosure, the acceleration information may include at least one of time series data of the velocity of the plunger and time series data of the acceleration. With this configuration, the detection device according to the present disclosure can appropriately detect abnormalities in the device.

[0011] In the detection method according to the present disclosure, acceleration information of the plunger during the injection operation is first acquired. Next, based on the acquired acceleration information, an acceleration abnormality of the plunger is detected in the injection direction and in a direction perpendicular to the injection direction. Then, if an acceleration abnormality is detected in the injection direction but an acceleration abnormality is not detected in the direction perpendicular to the injection direction, abnormality detection information related to the plunger drive mechanism is output. [Effects of the Invention]

[0012] The present disclosure can provide a detection device and a detection method that can easily identify an abnormality location. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic cross-sectional view showing the configuration of an injection molding machine according to a first embodiment. [Figure 2] 1 is a block diagram showing the configuration of a detection device according to a first embodiment. [Figure 3] 1 is a block diagram showing the configuration of a detection device according to a first embodiment. [Figure 4] 4 is a flowchart showing the operation of the detection device according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] (First embodiment) Hereinafter, a first embodiment according to the present disclosure will be described in detail with reference to the drawings.

[0015] <Configuration of injection molding equipment> The detection device according to this embodiment detects abnormalities that occur in an injection molding machine. First, the configuration of the injection molding machine according to this embodiment, that is, the injection molding machine that is the detection target of the detection device according to this embodiment, will be described in detail.

[0016] FIG. 1 is a schematic cross-sectional view showing the configuration of an injection molding apparatus according to the first embodiment. Naturally, the right-handed xyz Cartesian coordinate system shown in Figure 1 is a convenient way to explain the positional relationships of the components. Normally, the positive direction of the z axis is vertically upward, and the xy plane is the horizontal plane, which is common among the drawings.

[0017] The injection molding apparatus 1 according to this embodiment is a casting apparatus that performs casting by injecting molten metal into a mold. The injection molding apparatus 1 includes a mold 11, a plunger sleeve 12, and a plunger .

[0018] The mold 11 includes a movable mold 111 and a fixed mold 112. The movable mold 111 and the fixed mold 112 form a cavity C, which is a hollow space. A plunger sleeve 12 is connected to the fixed mold 112, and the molten metal M is injected into the cavity C from the plunger sleeve 12.

[0019] The plunger sleeve 12 is a cylindrical member connected to the fixed mold 112, and in this embodiment, extends parallel to the y-axis direction. A plunger 13 is fitted into the plunger sleeve 12.

[0020] The plunger sleeve 12 has an opening 12a for supplying the molten metal M into the inside of the plunger sleeve 12 and an injection port 12b that opens to communicate with the cavity C. The molten metal M supplied to the plunger sleeve 12 from the opening 12a is pushed in by the plunger 13 and injected into the cavity C from the injection port 12b.

[0021] Here, the plunger sleeve 12 corresponds to the sliding mechanism according to this embodiment, as will be described in detail later. In the plunger sleeve 12, for example, galling may occur.

[0022] The plunger 13 is a rod-shaped member fitted into the plunger sleeve 12 and configured to be slidable in the positive and negative directions of the y-axis. The plunger 13 pushes the molten metal M into the cavity C by moving in the negative direction of the y-axis. The plunger 13 includes a plunger tip 131 and a plunger rod 132 .

[0023] The plunger tip 131 is a cylindrical member having a cross-sectional shape that conforms to the inner surface of the plunger sleeve 12, and slides inside the plunger sleeve 12. The plunger tip 131 abuts against the molten metal M at the bottom surface on the negative side in the y-axis direction, and is connected to the plunger rod 132 at the bottom surface on the positive side in the y-axis direction. The plunger tip 131 slides in the negative y-axis direction by the plunger rod 132, and pushes the molten metal M into the cavity C.

[0024] The plunger rod 132 is a rod-shaped member that connects the plunger tip 131 to a plunger drive mechanism (not shown). The plunger rod 132 is pushed in the negative y-axis direction by the drive mechanism, and as a result, the plunger tip 131 is also pushed in the negative y-axis direction.

[0025] Here, the plunger rod 132 is provided with a sensor S. The sensor S is a sensor capable of detecting acceleration and / or velocity in at least three axial directions. The sensor S detects the acceleration and / or velocity of the plunger 13 during injection molding, and outputs the detection results to the detection device 2, which will be described later. In other words, the sensor S according to this embodiment outputs to the detection device 2 acceleration information of the plunger 13 during the injection operation.

[0026] The sensor S according to this embodiment may be provided on the plunger tip 131. When the sensor S is provided on the plunger tip 131, the sensor S can more appropriately detect the acceleration of the plunger 13 in a direction perpendicular to the ejection direction of the plunger 13, i.e., in a direction perpendicular to the y-axis. On the other hand, when the sensor S is provided on the plunger rod 132 as described above, deterioration of the sensor S caused by the heat of the molten metal M is suppressed.

[0027] The drive mechanism connected to the plunger rod 132 outputs a drive force for pushing the plunger 13 in the negative direction of the y-axis. Although details will be described later, the detection device according to this embodiment can detect an abnormality that has occurred in the drive mechanism based on acceleration information detected by the sensor S.

[0028] The drive mechanism according to this embodiment is, for example, a hydraulic cylinder whose drive output is controlled by a servo valve. However, the drive mechanism according to the present disclosure is not limited to the above, and any mechanism may be used as the drive mechanism as long as it has the controllability to appropriately slide the plunger 13 in the y-axis direction and is capable of outputting a drive force sufficient to push the molten metal M.

[0029] <Configuration of the detection device> Next, the detection device according to this embodiment will be described in detail with reference to the drawings. 2 and 3 are block diagrams showing the configuration of the detection device according to the first embodiment. In the following description, the contents of FIG. 1 will be referred to as appropriate.

[0030] The detection device 2 according to this embodiment detects the occurrence of an abnormality and the location of the abnormality in the injection molding device 1. More specifically, the detection device 2 according to this embodiment detects the occurrence of an abnormality in the injection molding device 1 and the location of the abnormality based on acceleration information of the plunger 13 provided in the injection molding device 1. As shown in FIG. 2, the detection device 2 according to this embodiment includes an acceleration information acquisition unit 21, an acceleration abnormality detection unit 22, and an output unit .

[0031] 3, the detection device 2 includes a calculation unit 24 such as a CPU (Central Processing Unit), and a storage unit 25 such as a RAM (Random Access Memory) or a ROM (Read Only Memory) that stores programs and data for controlling the operation of the detection device 2. In other words, the detection device 2 has the function of a computer.

[0032] 2 can be configured in hardware by the calculation unit 24, the storage unit 25, other circuits, etc., and can be realized in software by programs stored in the storage unit 25. In other words, the detection device 2 can be realized in various forms by hardware, software, or a combination of both.

[0033] The program includes a set of instructions (or software code) that, when loaded into a computer, causes the computer to perform one or more functions described in the embodiments. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, computer-readable media or tangible storage media include random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technologies, CD-ROM, digital versatile disc (DVD), Blu-ray (registered trademark) disc or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may also be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, transitory computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagated signals.

[0034] Returning to the explanation of Figure 2. The detection device 2 according to this embodiment is configured as a control device mounted on the injection molding device 1. In other words, the detection device 2 is configured as a control device for the injection molding device 1 that has a function of detecting abnormalities. Therefore, the detection device 2 according to this embodiment not only has the function of detecting abnormalities, but also the function of controlling the operation of the injection molding device 1.

[0035] It should be noted that the configuration of the detection device 2 according to the present disclosure is not limited to the above. For example, the detection device 2 according to the present disclosure may be a device independent of the injection molding device 1. In this case, the detection device 2 according to the present disclosure may be, for example, a computer device connected to the injection molding device 1 wirelessly or via a wire so as to be able to communicate with the injection molding device 1. Furthermore, for example, the detection device 2 according to the present disclosure may be a device provided independently of the control device of the injection molding device 1.

[0036] The acceleration information acquisition unit 21 acquires acceleration information of the plunger 13 during the injection operation. More specifically, the acceleration information acquisition unit 21 acquires the acceleration information from a sensor S attached to the plunger 13. The acceleration information acquisition unit 21 outputs the acceleration information to the acceleration abnormality detection unit 22. The acceleration information acquisition unit 21 may acquire the acceleration information of the plunger 13 from the sensor S via, for example, a wireless communication device.

[0037] Here, the acceleration information according to the present disclosure may be any information that can evaluate the acceleration of the plunger 13. Therefore, the acceleration information according to the present embodiment may be not only time-series data of the acceleration of the plunger 13, but also time-series data of the speed of the plunger 13, for example.

[0038] That is, the acceleration information may be at least one of time-series data on the speed of the plunger 13 and time-series data on the acceleration. With this configuration, the detection device according to the present disclosure can appropriately evaluate fluctuations in acceleration.

[0039] Naturally, the time-series data of the speed of the plunger 13 potentially includes information about the acceleration of the plunger 13. Therefore, the time-series data of the speed of the plunger 13 can be said to be information about the acceleration of the plunger 13, that is, acceleration information.

[0040] The acceleration abnormality detection unit 22 acquires acceleration information from the acceleration information acquisition unit 21. The acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger 13 in the injection direction and in a direction perpendicular to the injection direction based on the acceleration information. When the acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger 13, it outputs the detection result to the output unit . The acceleration abnormality referred to here refers to a state in which the acceleration of the plunger 13 observed shows a different tendency from the acceleration of the plunger 13 when no abnormality occurs in the injection molding apparatus 1.

[0041] The acceleration abnormality detection unit 22 may detect an acceleration abnormality by referring to time-series data of the acceleration of the plunger 13, for example. The acceleration abnormality detection unit 22 may detect an acceleration abnormality based on, for example, the difference between the average value of the acceleration within the referenced time period and the maximum or minimum value of the acceleration. In this case, for example, the acceleration abnormality detection unit 22 may determine that an acceleration abnormality has been detected when the rate of fluctuation of the acceleration of the plunger 13 is large. Furthermore, the acceleration abnormality detection unit 22 may detect an acceleration abnormality based on, for example, the fluctuation period of the acceleration within the referenced time. In this case, for example, the acceleration abnormality detection unit 22 may determine that an acceleration abnormality has been detected when the vibration period of the time-series data of the acceleration of the plunger 13 is shorter than a predetermined value. In this case, the acceleration abnormality detection unit 22 may, for example, compare the acquired acceleration time series data with normal acceleration time series data and detect an acceleration abnormality based on the comparison result. For example, the acceleration abnormality detection unit 22 may determine that an acceleration abnormality has been detected when the difference between the acquired acceleration time series data and normal acceleration time series data is equal to or greater than a predetermined reference value.

[0042] Furthermore, the acceleration abnormality detection unit 22 may detect an acceleration abnormality by referring to time-series data of the speed of the plunger 13, for example. The acceleration abnormality detection unit 22 may, for example, calculate time series data of acceleration based on the acquired time series data of speed, and may then detect an acceleration abnormality based on the calculated time series data of acceleration. Furthermore, the acceleration abnormality detection unit 22 may detect an acceleration abnormality based on, for example, the period of fluctuation of the speed within the referenced time. In this case, for example, the acceleration abnormality detection unit 22 may determine that an acceleration abnormality has been detected when the vibration period of the time-series data of the speed of the plunger 13 is shorter than a predetermined value. Furthermore, the acceleration abnormality detection unit 22 may, for example, compare the acquired time series data of the speed with time series data of a normal speed and detect an acceleration abnormality based on the comparison result. In this case, for example, the acceleration abnormality detection unit 22 may determine that an acceleration abnormality has been detected when the difference between the acquired time series data of the speed and the time series data of a normal speed is equal to or greater than a predetermined standard.

[0043] That is, the acceleration abnormality detection unit 22 may have any configuration as long as it is capable of detecting the occurrence of an acceleration pattern that has a tendency different from that of normal times.

[0044] Furthermore, the acceleration abnormality detection unit 22 may detect an acceleration abnormality based on time-series data for a period in which at least one of the absolute values ​​of the acceleration and velocity of the plunger 13 is equal to or less than a predetermined value. In the time-series data for such a period, the fluctuation value of acceleration is gentle, making it easy to detect an abnormal acceleration pattern. Therefore, with this configuration, the detection device 2 according to this embodiment can detect the occurrence of an abnormality in the injection molding device 1 with higher accuracy.

[0045] The output unit 23 acquires the detection result of the acceleration abnormality of the plunger 13 from the acceleration abnormality detection unit 22. The output unit 23 outputs abnormality detection information based on the acquired detection result. Here, the abnormality detection information is information relating to the occurrence of an abnormality in the injection molding device 1 and the estimated location of the abnormality, and is typically information that is notified to the user. The abnormality detection information may be notified to the user, for example, by displaying a warning message on a display screen of a computer, etc. Furthermore, the abnormality detection information may be notified to the user, for example, by lighting up a lamp or sounding an alarm.

[0046] The output unit 23 in this embodiment outputs abnormality detection information regarding the drive mechanism of the plunger 13 when the acceleration abnormality detection unit 22 detects an acceleration abnormality in the injection direction but does not detect an acceleration abnormality in a direction perpendicular to the injection direction. That is, in the above case, the output unit 23 determines that an abnormality has occurred in the drive mechanism of the plunger 13, and notifies the user of this. An example of an abnormality that may occur in the drive mechanism is deterioration of a servo valve that adjusts the output of a hydraulic cylinder.

[0047] As described above, the drive mechanism according to this embodiment outputs a drive force for pushing the plunger 13 in the negative y-axis direction, i.e., in the injection direction. On the other hand, the drive mechanism does not output a force to the plunger 13 in a direction perpendicular to the y-axis, i.e., in a direction perpendicular to the injection direction. If an abnormality occurs in the drive mechanism due to this, the abnormality will affect the operation of the plunger 13 only in the injection direction. Therefore, if an abnormality occurs in the drive mechanism, it is thought that an acceleration abnormality will occur in the injection direction, but that an acceleration abnormality will hardly occur in the direction perpendicular to the injection direction. Therefore, as described above, when the acceleration abnormality detection unit 22 detects an acceleration abnormality in the injection direction but does not detect an acceleration abnormality in a direction perpendicular to the injection direction, the output unit 23 outputs abnormality detection information regarding the drive mechanism of the plunger 13. With this configuration, the detection device 2 according to this embodiment can appropriately detect the occurrence of an abnormality in the drive mechanism of the plunger 13.

[0048] Furthermore, when the output unit 23 detects an acceleration abnormality in a direction perpendicular to the injection direction, it outputs abnormality detection information relating to the sliding mechanism of the plunger. An example of an abnormality that may occur in the drive mechanism, that is, the plunger sleeve 12, is galling.

[0049] If an abnormality occurs in the sliding mechanism, i.e., the plunger sleeve 12, the plunger 13 is subjected to a force not only in the injection direction but also in a direction perpendicular to the injection direction from the abnormality. Therefore, if an abnormality occurs in the sliding mechanism, it is thought that an abnormality in the acceleration of the plunger 13 occurs not only in the injection direction but also in the direction perpendicular to the injection direction. Therefore, as described above, when the output unit 23 detects an acceleration abnormality in a direction perpendicular to the injection direction, it outputs abnormality detection information relating to the sliding mechanism of the plunger. With this configuration, the detection device 2 according to this embodiment can appropriately detect the occurrence of an abnormality in the sliding mechanism of the plunger 13.

[0050] The output unit 23 may be configured to output abnormality detection information regarding the sensor S when the absolute value of at least one of the acceleration and the velocity is smaller than a predetermined value. In other words, if the absolute value of the acceleration or the absolute value of the velocity is smaller than a predetermined value, the output unit 23 may determine that the sensor is not functioning properly and that the acceleration or velocity of the plunger 13 cannot be detected properly. With this configuration, the detection device 2 according to this embodiment can more appropriately detect the occurrence of an abnormality.

[0051] As described above, the detection device 2 according to this embodiment is configured to detect the occurrence of an abnormality based on the acceleration information of the plunger 13 during the injection operation. More specifically, when the detection device 2 according to this embodiment detects an acceleration abnormality in the injection direction but does not detect an acceleration abnormality in a direction perpendicular to the injection direction, it outputs abnormality detection information related to the drive mechanism of the plunger 13. Furthermore, when the detection device 2 according to this embodiment detects an acceleration abnormality in a direction perpendicular to the injection direction, it outputs abnormality detection information related to the sliding mechanism of the plunger 13.

[0052] With this configuration, the detection device 2 according to this embodiment can identify the location of the abnormality when detecting the abnormality. In other words, with this configuration, the detection device 2 according to this embodiment can easily determine the location of the abnormality in the injection molding device 1.

[0053] <Detection device operation> Next, a detailed description will be given of the operation of the detection device, that is, the detection method according to the first embodiment. Fig. 4 is a flowchart showing the operation of the detection device according to the first embodiment. In the following description, reference will be made to FIGS. 1 and 2 as appropriate.

[0054] In the detection method according to this embodiment, first, the acceleration information acquisition unit 21 acquires acceleration information of the plunger 13 (step ST101). More specifically, the acceleration information acquisition unit 21 acquires the acceleration information from the sensor S.

[0055] Next, the acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger 13 (step ST102). More specifically, the acceleration abnormality detection unit 22 detects an acceleration abnormality of the plunger 13 in the injection direction and in a direction perpendicular to the injection direction.

[0056] Next, the output unit 23 determines whether or not the acceleration abnormality detection unit 22 has detected an acceleration abnormality in the ejection direction (step ST103). If the acceleration abnormality detection unit 22 has not detected an acceleration abnormality in the ejection direction (NO in step ST103), the detection device 2 ends the series of operations.

[0057] If the acceleration abnormality detection unit 22 detects an acceleration abnormality in the injection direction (YES in step ST103), the output unit 23 determines whether the acceleration abnormality detection unit 22 has detected an acceleration abnormality in a direction perpendicular to the injection direction (step ST104).

[0058] If the acceleration abnormality detection unit 22 does not detect an acceleration abnormality in a direction perpendicular to the injection direction (NO in step ST104), the output unit 23 outputs abnormality detection information related to the drive mechanism (step ST105), and the detection device 2 ends the series of operations.

[0059] If the acceleration abnormality detection unit 22 detects an acceleration abnormality in a direction perpendicular to the injection direction (YES in step ST104), the output unit 23 outputs abnormality detection information related to the sliding mechanism (step ST106), and the detection device 2 ends the series of operations.

[0060] It should be noted that the configurations in steps ST103 and ST104 are merely examples, and the determination regarding abnormality detection may be performed using a configuration different from the above. In the detection method according to the present disclosure, any configuration may be used as long as an acceleration abnormality is detected in the injection direction, and if no acceleration abnormality is detected in a direction perpendicular to the injection direction, abnormality detection information regarding the drive mechanism is output.

[0061] As described above, the detection method according to this embodiment is configured to output abnormality detection information regarding the drive mechanism of plunger 13 when an acceleration abnormality is detected in the injection direction and when an acceleration abnormality is not detected in a direction perpendicular to the injection direction. Furthermore, the detection method according to this embodiment is configured to output abnormality detection information regarding the sliding mechanism of plunger 13 when an acceleration abnormality is detected in a direction perpendicular to the injection direction.

[0062] With this configuration, the detection method according to this embodiment can also identify the location of the abnormality. In other words, with this configuration, the detection method according to this embodiment can easily determine the location of the abnormality in the injection molding device 1.

[0063] The present invention has been described above in accordance with the above-described embodiments, but the present invention is not limited to the configurations of the above-described embodiments, and naturally includes various modifications, alterations, and combinations that can be made by a person skilled in the art within the scope of the invention claimed in the claims of this application. [Explanation of symbols]

[0064] 1 injection molding machine, 11 mold, 111 movable mold, 112 fixed mold, 12 plunger sleeve, 12a opening, 12b injection port, 13 plunger, 131 plunger tip, 132 plunger rod, 2 detection device, 21 acceleration information acquisition unit, 22 acceleration abnormality detection unit, 23 output unit, 24 calculation unit, 25 Memory unit, S Sensor, M Molten metal, C Cavity

Claims

1. an acceleration information acquisition unit that acquires acceleration information of the plunger during the injection operation; an acceleration abnormality detection unit that detects an acceleration abnormality of the plunger in the injection direction and in a direction perpendicular to the injection direction based on the acceleration information; and an output unit that outputs abnormality detection information related to the plunger drive mechanism when the acceleration abnormality detection unit detects an acceleration abnormality in the injection direction but does not detect an acceleration abnormality in a direction perpendicular to the injection direction. Detection device.

2. When the acceleration abnormality detection unit detects an acceleration abnormality in a direction perpendicular to the injection direction, the output unit outputs abnormality detection information related to the sliding mechanism of the plunger. The detection device according to claim 1 .

3. the acceleration information acquisition unit acquires the acceleration information from a sensor attached to the plunger, When the absolute value of at least one of the acceleration and the velocity is smaller than a predetermined value, the output unit outputs abnormality detection information related to the sensor.

3. The detection device according to claim 1 or 2.

4. The acceleration information includes at least one of time series data of the velocity of the plunger and time series data of the acceleration.

3. The detection device according to claim 1 or 2.

5. Acquires plunger acceleration information during injection operation, detecting an acceleration abnormality of the plunger in the injection direction and in a direction perpendicular to the injection direction based on the acquired acceleration information; When an acceleration abnormality is detected in the injection direction and an acceleration abnormality is not detected in a direction perpendicular to the injection direction, abnormality detection information regarding the drive mechanism of the plunger is output. Detection method.

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