Detection device and detection method

Abstract

Provided are a detection device and a detection method with which it is possible to easily discriminate a location where an abnormality occurs in an injection molding device. A detection device (2) according to the present disclosure is provided with an acceleration information acquisition unit (21), an acceleration abnormality detection unit (22), and an output unit (23). An acceleration information acquisition unit (21) acquires acceleration information of a plunger during an injection operation. An acceleration abnormality detection unit (22) detects an acceleration abnormality of the plunger in the injection direction and a direction perpendicular to the injection direction on the basis of the acceleration information. The output unit (23) outputs abnormality detection information pertaining to the drive mechanism of the plunger when the acceleration abnormality detection unit (22) detects an acceleration abnormality in the injection direction and does not detect an acceleration abnormality in a direction perpendicular to the injection direction.

Description

Technical Field

[0001] This disclosure relates to testing devices and testing methods. Background Technology

[0002] Patent Document 1 describes a method for determining the degree of scratches in the injection plunger mechanism of a die-casting machine. In the method described in Patent Document 1, the degree of scratches on the plunger is determined by measuring the plunger's travel distance or travel time. Existing technical documents Patent documents

[0003] Patent Document 1: Japanese Patent Publication No. 02-032066 Summary of the Invention The technical problem that the invention aims to solve

[0004] As described above, in the detection method described in Patent Document 1, the degree of damage to the plunger is determined by measuring the plunger's travel distance or travel time. However, abnormalities affecting plunger injection are not limited to strains; for example, abnormalities in the plunger's drive mechanism can also affect plunger injection. Patent document 1 does not disclose a technique for easily identifying the location of various abnormalities that affect the injection of the plunger.

[0005] This disclosure was made to solve such technical problems, and its purpose is to provide a detection device and detection method that can easily identify abnormal parts. Means for solving technical problems

[0006] The detection device disclosed herein includes an acceleration information acquisition unit, an acceleration anomaly detection unit, and an output unit. The acceleration information acquisition unit acquires acceleration information of the plunger during injection. The acceleration anomaly detection unit detects acceleration anomalies of the plunger in the injection direction and in directions perpendicular to the injection direction based on the acceleration information. The output unit outputs anomaly detection information related to the plunger's drive mechanism when the acceleration anomaly detection unit detects an acceleration anomaly in the injection direction but does not detect an acceleration anomaly in the direction perpendicular to the injection direction.

[0007] With this configuration, the detection device disclosed herein can detect an abnormality occurring in the plunger drive mechanism, including at the location of the abnormality. In other words, with this configuration, the detection device disclosed herein can easily identify the abnormal location.

[0008] In the detection device disclosed herein, when the acceleration anomaly detection unit detects an acceleration anomaly in a direction perpendicular to the injection direction, the output unit outputs anomaly detection information related to the sliding mechanism of the plunger. With this configuration, the detection device disclosed herein can detect an abnormality occurring in the sliding mechanism of the plunger, including at the location of the abnormality. In other words, with this configuration, the detection device disclosed herein can identify abnormal locations with higher accuracy.

[0009] In the detection apparatus disclosed herein, the acceleration information acquisition unit may acquire acceleration information from a sensor mounted on the plunger. Furthermore, if the absolute value of the acceleration is less than a predetermined value, the output unit may output abnormal detection information related to the sensor. With this configuration, the detection device disclosed herein can properly detect sensor anomalies. As a result, the detection device disclosed herein can suppress missed detections of abnormal locations.

[0010] In the detection apparatus disclosed herein, the acceleration information may include at least one of time-series data of the plunger's velocity and time-series data of acceleration. Based on this configuration, the detection device disclosed herein is capable of properly detecting device malfunctions.

[0011] In the detection method disclosed herein, firstly, the acceleration information of the plunger during the injection action is obtained. Next, based on the obtained acceleration information, acceleration anomalies of the plunger are detected in the injection direction and in the direction perpendicular to the injection direction. Then, if an acceleration anomaly is detected in the injection direction but no acceleration anomaly is detected in the direction perpendicular to the injection direction, anomaly detection information related to the plunger's drive mechanism is output. Invention Effects

[0012] According to this disclosure, a detection device and detection method can be provided that can easily identify abnormal parts. Attached Figure Description

[0013] Figure 1 This is a schematic cross-sectional view showing the configuration of the injection molding machine according to the first embodiment. Figure 2 This is a block diagram showing the configuration of the detection device according to the first embodiment. Figure 3 This is a block diagram showing the configuration of the detection device according to the first embodiment. Figure 4 This is a flowchart illustrating the operation of the detection device according to the first embodiment. Detailed Implementation

[0014] (First Implementation) Hereinafter, the first embodiment involved in this disclosure will be described in detail with reference to the accompanying drawings.

[0015] <Composition of Injection Molding Apparatus> The detection device of this embodiment detects abnormalities occurring in the injection molding apparatus. First, the configuration of the injection molding apparatus according to this embodiment, that is, the injection molding apparatus that is the object of detection by the detection device according to this embodiment, will be described in detail.

[0016] Figure 1 This is a schematic cross-sectional view showing the configuration of the injection molding apparatus according to the first embodiment. In addition, of course, Figure 1 The right-handed xyz orthogonal coordinate system shown is a convenient coordinate system for illustrating the positional relationships of constituent elements. Typically, the positive z-axis points vertically upwards, and the xy plane is horizontal; this is common across the attached figures.

[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 13.

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

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

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

[0021] Here, the plunger sleeve 12 corresponds to the sliding mechanism involved in this embodiment, and details will be described later. For example, scoring may sometimes occur in the plunger sleeve 12.

[0022] The plunger 13 is a rod-shaped component embedded in the plunger sleeve 12, configured to slide in both the positive and negative directions of the y-axis. By moving in the negative y-axis direction, the plunger 13 pushes the molten metal M into the mold cavity C. The plunger 13 has a plunger head 131 and a plunger rod 132.

[0023] The plunger head 131 is a cylindrical component with a cross-sectional shape along the inner surface of the plunger sleeve 12, and slides inside the plunger sleeve 12. The plunger head 131 abuts against the molten metal M at its bottom surface on the negative side of the y-axis direction, and is connected to the plunger rod 132 at its bottom surface on the positive side of the y-axis direction. The plunger head 131 slides towards the negative side of the y-axis using the plunger rod 132, pushing the molten metal M into the mold cavity C.

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

[0025] Here, a sensor S is installed on the plunger rod 132. Sensor S is a sensor capable of detecting acceleration and / or velocity in at least three axial directions. During injection molding, sensor S detects the acceleration and / or velocity of plunger 13 and outputs the detection result to the detection device 2 described later. In other words, the sensor S involved in this embodiment outputs the acceleration information of the plunger 13 during the injection action to the detection device 2.

[0026] Alternatively, the sensor S involved in this embodiment can also be provided on the plunger head 131. When the sensor S is provided on the plunger head 131, the sensor S can more accurately detect the acceleration of the plunger 13 in the direction perpendicular to the injection direction of the plunger 13, that is, in the direction perpendicular to the y-axis. On the other hand, when the sensor S is mounted on the plunger rod 132 as described above, the deterioration of the sensor S caused by the heat of the molten metal M can be suppressed.

[0027] The drive mechanism connected to the plunger rod 132 outputs a driving force to push the plunger 13 in the negative y-axis direction. The detection device described in this embodiment can detect abnormalities generated in the drive mechanism based on the acceleration information detected by the sensor S, which will be described in detail later.

[0028] In this embodiment, the drive mechanism is, for example, a hydraulic cylinder whose drive output is controlled by a servo valve. However, the drive mechanism disclosed herein is not limited to the above configuration. Any mechanism can be used as the drive mechanism as long as it has the controllability to allow the plunger 13 to slide properly along the y-axis and is capable of outputting a driving force sufficient to push in the molten metal M.

[0029] <Composition of the Detection Device> The detection device according to this embodiment will now be described in detail with reference to the accompanying drawings. Figure 2 and Figure 3 This is a block diagram showing the configuration of the detection device according to the first embodiment. Furthermore, in the following description, appropriate reference will be made to... Figure 1 The contents recorded.

[0030] The detection device 2 according to this embodiment detects the occurrence of abnormalities in the injection molding apparatus 1 and the location of such abnormalities. More specifically, the detection device 2 according to this embodiment detects the occurrence of abnormalities in the injection molding apparatus 1 and the location of such abnormalities based on the acceleration information of the plunger 13 provided in the injection molding apparatus 1. like Figure 2 As shown, the detection device 2 according to this embodiment includes an acceleration information acquisition unit 21, an acceleration anomaly detection unit 22, and an output unit 23.

[0031] Here, as Figure 3 As shown, the detection device 2 includes, for example, an arithmetic unit 24 such as a CPU (Central Processing Unit) and a storage unit 25 such as RAM (Random Access Memory) and ROM (Read Only Memory) that stores programs and data used to control the operation of the detection device 2. That is, the detection device 2 has the function of a computer.

[0032] Therefore, constitute Figure 2 The functional blocks of the detection device 2 shown can be constructed in hardware by the aforementioned arithmetic unit 24, storage unit 25, and other circuits, and in software by programs stored in the storage unit 25. That is, the detection device 2 can be implemented in various ways by hardware, software, or a combination of both.

[0033] Additionally, the program contains a set of commands (or software code) that, when read into a computer, cause the computer to perform one or more functions described in the implementation. The program may also be stored on 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 disc (registered trademark), or other optical disc storage, cassette tape, magnetic tape, disk storage, or other magnetic storage devices. The program may also be transmitted on a temporary computer-readable medium or a communication medium. By way of example, and not limitation, temporary computer-readable media or communication media include electrical, optical, acoustic, or other forms of propagation signals.

[0034] Back Figure 2 Explanation. The detection device 2 in this embodiment is configured as a control device mounted on the injection molding apparatus 1. That is, the detection device 2 is configured as a control device for the injection molding apparatus 1 with an anomaly detection function. Therefore, the detection device 2 in this embodiment not only has the function of anomaly detection but also the function of controlling the operation of the injection molding apparatus 1.

[0035] Furthermore, the configuration of the detection device 2 disclosed herein is not limited to the above-described situation. For example, the detection device 2 involved in this disclosure may also be a device independent of the injection molding apparatus 1. In this case, the detection device 2 involved in this disclosure may be, for example, a computer device that can be wirelessly or wiredly connected to the injection molding apparatus 1. Alternatively, for example, the detection device 2 involved in this disclosure may also be a device that is set independently of the control device of the injection molding apparatus 1.

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

[0037] Here, the acceleration information involved in this disclosure can be any information that can evaluate the acceleration of the plunger 13. Therefore, the acceleration information involved in this embodiment can be not only time series data of the acceleration of the plunger 13, but also, for example, time series data of the velocity of the plunger 13.

[0038] In other words, the acceleration information can be at least one of the time-series data of the plunger 13's velocity and the time-series data of its acceleration. Based on this configuration, the detection device disclosed herein can appropriately evaluate changes in acceleration.

[0039] Furthermore, the time-series data of the plunger 13 velocity inherently contains information related to the acceleration of the plunger 13. Therefore, it can be said that the time-series data of the plunger 13 velocity is information related to the acceleration of the plunger 13, i.e., acceleration information.

[0040] The acceleration anomaly detection unit 22 acquires acceleration information from the acceleration information acquisition unit 21. Based on the acceleration information, the acceleration anomaly detection unit 22 detects acceleration anomalies in the plunger 13 in the injection direction and in the direction perpendicular to the injection direction. When the acceleration anomaly detection unit 22 detects an acceleration anomaly in the plunger 13, it outputs the detection result to the output unit 23. Furthermore, the acceleration anomaly mentioned here refers to the state in which the acceleration of the plunger 13 is observed to show a tendency to differ from the acceleration of the plunger 13 when no anomaly occurs in the injection molding apparatus 1.

[0041] The acceleration anomaly detection unit 22 can also detect acceleration anomalies by referring to the time series data of the acceleration of the plunger 13. The acceleration anomaly detection unit 22 can also detect acceleration anomalies based on, for example, the difference between the average acceleration value and the maximum or minimum acceleration value within a reference time period. In this case, for example, the acceleration anomaly detection unit 22 can determine that an acceleration anomaly has been detected when the rate of change of the acceleration of the plunger 13 is large. Alternatively, the acceleration anomaly detection unit 22 can detect acceleration anomalies based on the period of acceleration variation within a reference time. In this case, for example, the acceleration anomaly detection unit 22 can determine that an acceleration anomaly has been detected if the vibration period of the time series data of the acceleration of the plunger 13 is less than a predetermined value. Alternatively, in this case, the acceleration anomaly detection unit 22 may compare the acquired acceleration time series data with normal acceleration time series data, and detect acceleration anomalies based on the comparison result. For example, the acceleration anomaly detection unit 22 may determine that an acceleration anomaly has been detected if the difference between the acquired acceleration time series data and the normal acceleration time series data is above a predetermined benchmark.

[0042] In addition, the acceleration anomaly detection unit 22 can also detect acceleration anomalies by referring to the time series data of the piston 13's velocity. The acceleration anomaly detection unit 22 can, for example, calculate acceleration time-series data based on the acquired velocity time-series data. Then, acceleration anomalies can be detected based on the calculated acceleration time-series data. Alternatively, the acceleration anomaly detection unit 22 can also detect acceleration anomalies based on the velocity variation period within a reference time period. In this case, for example, the acceleration anomaly detection unit 22 can determine that an acceleration anomaly has been detected if the vibration period of the time series data of the plunger 13's velocity is less than a predetermined value. Alternatively, the acceleration anomaly detection unit 22 may compare the acquired velocity time series data with normal velocity time series data, and detect acceleration anomalies based on the comparison result. In this case, for example, the acceleration anomaly detection unit 22 may determine that an acceleration anomaly has been detected if the difference between the acquired velocity time series data and the normal velocity time series data is above a predetermined benchmark.

[0043] In other words, the acceleration anomaly detection unit 22 can be any configuration as long as it is capable of detecting the occurrence of acceleration patterns that are different from those in normal conditions.

[0044] Alternatively, the acceleration anomaly detection unit 22 can also detect acceleration anomalies based on time series data during periods when at least one of the absolute values ​​of the acceleration and velocity of the plunger 13 is below a predetermined value. In such time series data, since the acceleration fluctuations are mild, it is easy to detect abnormal acceleration patterns. Therefore, based on this configuration, the detection device 2 according to this embodiment can detect the occurrence of abnormalities in the injection molding apparatus 1 with higher accuracy.

[0045] The output unit 23 obtains the detection result of the acceleration anomaly of the plunger 13 from the acceleration anomaly detection unit 22. Based on the obtained detection result, the output unit 23 outputs anomaly detection information. Here, the so-called abnormality detection information refers to information related to the occurrence of abnormalities in the injection molding device 1 and the presumed location of the abnormality, typically information notified to the user. Anomaly detection information can be communicated to the user, for example, by displaying a warning message on the screen of a computer or similar device. Alternatively, anomaly detection information can also be communicated to the user via the illumination of a light or the sound of a warning audible.

[0046] In this embodiment, the output unit 23 outputs abnormality detection information related to the drive mechanism of the plunger 13 when the acceleration abnormality detection unit 22 detects an acceleration abnormality in the injection direction and does not detect an acceleration abnormality in the direction perpendicular to the injection direction. In other words, under the aforementioned circumstances, the output unit 23 determines that an abnormality has occurred in the drive mechanism of the plunger 13 and notifies the user of the situation. In addition, as an example of anomalies occurring in the drive mechanism, one could cite the deterioration of a servo valve that adjusts the output of a hydraulic cylinder.

[0047] As described above, the drive mechanism of this embodiment outputs a driving force to push the plunger 13 in the negative y-axis direction, i.e., 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., perpendicular to the injection direction. For this reason, in the event of an anomaly in the drive mechanism, the impact of the anomaly on the action of the plunger 13 is approximately limited to the injection direction. Therefore, it can be assumed that in the event of an anomaly in the drive mechanism, an acceleration anomaly will occur in the injection direction, while almost no acceleration anomaly will occur in the direction perpendicular to the injection direction. Therefore, as described above, when the acceleration anomaly detection unit 22 detects an acceleration anomaly in the injection direction but does not detect an acceleration anomaly in the direction perpendicular to the injection direction, the output unit 23 outputs an anomaly detection information related to the drive mechanism of the plunger 13. With this configuration, the detection device 2 according to this embodiment can appropriately detect the occurrence of anomalies in the drive mechanism of the plunger 13.

[0048] In addition, if the output unit 23 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. In addition, as an example of an abnormality that occurs in the sliding mechanism, i.e., the plunger sleeve 12, strain can be cited.

[0049] In the event of an anomaly in the sliding mechanism, i.e., the plunger sleeve 12, the plunger 13 will be subjected to forces not only in the injection direction but also in a direction perpendicular to the injection direction. Therefore, in the event of an anomaly in the sliding mechanism, abnormal acceleration of the plunger 13 will occur not only in the injection direction but also in a 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 related to the sliding mechanism of the plunger. With this configuration, the detection device 2 according to this embodiment can properly detect the occurrence of abnormalities in the sliding mechanism of the plunger 13.

[0050] In addition, the output unit 23 may also output abnormal detection information related to the sensor S when at least one of the absolute value of acceleration and the absolute value of velocity is less than a predetermined value. In other words, if the absolute value of the acceleration or the absolute value of the velocity is less than a predetermined value, the output unit 23 can determine that the sensor is not functioning properly and cannot properly detect the acceleration or velocity of the plunger 13. Based on this configuration, the detection device 2 according to this embodiment can more appropriately detect the occurrence of abnormalities.

[0051] As described above, the detection device 2 of this embodiment detects the occurrence of abnormalities based on the acceleration information of the plunger 13 during the injection action. More specifically, the detection device 2 of this embodiment outputs abnormality detection information related to the drive mechanism of the plunger 13 when it detects an acceleration abnormality in the injection direction and no acceleration abnormality is detected in the direction perpendicular to the injection direction. Furthermore, the detection device 2 of this embodiment outputs abnormality detection information related to the sliding mechanism of the plunger 13 when it detects an acceleration abnormality in the direction perpendicular to the injection direction.

[0052] With this configuration, the detection device 2 according to this embodiment can simultaneously determine the location of the abnormality during the detection of anomalies. 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 apparatus 1.

[0053] <Operation of the detection device> Next, the operation of the detection device, i.e. the detection method involved in the first embodiment, will be described in detail. Figure 4 This is a flowchart illustrating the operation of the detection device according to the first embodiment. Additionally, please refer to the following explanations as appropriate. Figure 1 and Figure 2 .

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

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

[0056] Next, the output unit 23 determines whether the acceleration anomaly detection unit 22 has detected an acceleration anomaly in the injection direction. (Step ST103) If the acceleration anomaly detection unit 22 does not detect an acceleration anomaly in the injection direction (step ST103: "No"), the detection device 2 ends a series of actions.

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

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

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

[0060] In addition, of course, the configurations in steps ST103 and ST104 are just one example, and different configurations can also be used to make judgments related to anomaly detection. In the detection method disclosed herein, any configuration can be used as long as an acceleration anomaly is detected in the injection direction and no acceleration anomaly is detected in the direction perpendicular to the injection direction, and the configuration that outputs anomaly detection information related to the drive mechanism is used.

[0061] As described above, the detection method of this embodiment outputs abnormality detection information related to the drive mechanism of the plunger 13 when an acceleration abnormality is detected in the injection direction and no acceleration abnormality is detected in the direction perpendicular to the injection direction. Furthermore, the detection method of this embodiment outputs abnormality detection information related to the sliding mechanism of the plunger 13 when an acceleration abnormality is detected in the direction perpendicular to the injection direction.

[0062] Based on this configuration, the detection method according to this embodiment can simultaneously determine the location of the abnormality. In other words, based on this configuration, the detection method according to this embodiment can easily identify the location of the abnormality in the injection molding apparatus 1.

[0063] The present invention has been described above based on the above embodiments, but the present invention is not limited to the above embodiments. Within the scope of the invention as defined in the claims of this application, it naturally includes various modifications, alterations, and combinations that can be made by those skilled in the art. [Explanation of reference numerals in the attached figures]

[0064] 1 Injection molding apparatus, 11 Mold, 111 Movable mold, 112 Fixed mold, 12 Piston sleeve, 12a Opening, 12b Injection port, 13 Piston, 131 Piston head, 132 Piston rod, 2 Detection device, 21 Acceleration information acquisition unit, 22 Acceleration anomaly detection unit, 23 Output unit, 24 Calculation unit, 25 Storage unit, S Sensor, M Molten metal, C Mold cavity.

Claims

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

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

3. The detection device according to claim 1 or 2, wherein the acceleration information acquisition section acquires the acceleration information from a sensor provided on the plunger, and the output section outputs abnormality detection information related to the sensor when at least one of an absolute value of acceleration and an absolute value of velocity is less than a predetermined value.

4. The detection device according to claim 1 or 2, wherein the acceleration information includes at least one of time-series data of velocity and time-series data of acceleration of the plunger.

5. A detection method comprising: acquiring acceleration information of a plunger during an injection operation; detecting acceleration abnormality of the plunger in an injection direction and a direction perpendicular to the injection direction based on the acquired acceleration information; and outputting abnormality detection information related to a drive mechanism of the plunger when acceleration abnormality is detected in the injection direction and acceleration abnormality is not detected in the direction perpendicular to the injection direction. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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