A leak detection method and system for a hydraulic circuit of an injection molding machine

Abstract

The present invention discloses a leakage detection method and system for a hydraulic circuit of an injection molding machine, and relates to the field of injection molding machines. The present invention obtains motion curves corresponding to various hydraulic components of a standard injection molding machine during operation, and stores the operation data in the motion curves in a database, thereby obtaining the real-time motion state of the hydraulic components and the corresponding real-time motor speed of the injection molding machine during the production process. The present invention uses the current load and the real-time speed of the hydraulic components under the current load to match the operating load of the corresponding hydraulic components in the database with the operating speed corresponding to the operating load. If the matches are consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained. The leakage state of the hydraulic component is judged by the difference, thereby solving the problem of maintenance delay and maintenance inconvenience caused by the injection molding machine being unable to automatically detect the leakage of its own hydraulic circuit.

Description

Technical Field

[0001] The present invention relates to the field of injection molding machines, and in particular to a leakage detection method and system for a hydraulic circuit of an injection molding machine. Background Art

[0002] At present, there is no method in the injection molding machine industry that can automatically detect abnormal leakage in its own hydraulic circuit. Manual detection is required, which results in maintenance delays and inconvenience. As the hydraulic injection molding machine runs, the gears, bushings and other components of the hydraulic oil pump, as well as the hydraulic actuators, will wear or be damaged, resulting in additional hydraulic oil leakage. When the leakage volume increases but cannot be discovered in time, it will have a great impact on the performance of the machine and the energy consumption of operation. For example, the sealing ring in the mold opening and closing cylinder will leak hydraulic oil due to wear or deformation, making it difficult to form a pressure difference to push the template when opening and closing the mold, making the mold opening and closing speed slower and the energy consumption higher, thereby greatly affecting the performance and production speed of the machine. Summary of the Invention

[0003] In order to enable an injection molding machine to automatically detect leakage in its own hydraulic circuit, the present invention proposes a leakage detection method for the hydraulic circuit of an injection molding machine, comprising the steps of:

[0004] S1: Obtaining a motion curve corresponding to each hydraulic component during operation of a standard injection molding machine, and storing the operating data in the motion curve in a database, wherein the motion curve is used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation, and the motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load; the operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number;

[0005] S2: Acquire the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load;

[0006] S3: Using the current load and the real-time speed of the hydraulic component under the current load, the operating load of the corresponding hydraulic component and the operating speed corresponding to the operating load are matched in the database. If the match is consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained;

[0007] S4: Determine whether the difference is within the standard range. If not, issue a leakage alarm for the hydraulic component.

[0008] Furthermore, the steps between steps S1 and S2 further include the following steps:

[0009] S11: Acquire the serial number of the hydraulic component to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the serial number of the hydraulic component to be detected as the current hydraulic component number, and enter step S2.

[0010] Furthermore, the step S4 further includes the following steps:

[0011] S5: Determine whether the number of the current hydraulic component is the last number in the preset priority sequence. If so, proceed to step S6. If not, set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number and proceed to step S2.

[0012] S6: Determine whether the difference values corresponding to the hydraulic components to be tested are all outside the corresponding standard range. If so, issue a leakage alarm for the hydraulic oil pump.

[0013] Furthermore, the hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

[0014] Furthermore, the hydraulic circuit is composed of various hydraulic components.

[0015] The present invention also proposes a leakage detection system for a hydraulic circuit of an injection molding machine, comprising:

[0016] A database module is used to obtain motion curves corresponding to each hydraulic component during operation of a standard injection molding machine and store operating data in the motion curves into a database. The motion curves are used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation. The motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load. The operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number.

[0017] An acquisition module is used to obtain the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load;

[0018] a matching module for matching the operating load of the corresponding hydraulic component in the database with the operating speed corresponding to the operating load using the current load and the real-time speed of the hydraulic component under the current load; if the matching is consistent, obtaining the motor speed corresponding to the matched operating load and operating speed in the database, and obtaining the difference between the motor speed and the real-time motor speed;

[0019] The alarm module is used to issue a leakage alarm for the hydraulic component when the difference is not within a standard range.

[0020] Furthermore, the system further comprises:

[0021] The cycle detection module is used to obtain the hydraulic component number to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the number of the hydraulic component to be detected as the current hydraulic component number, and enter the acquisition module.

[0022] Furthermore, the system further comprises:

[0023] A first judgment module is configured to set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number when the number of the current hydraulic component is not the last number in the preset priority sequence;

[0024] The second judgment module is used to judge whether the difference values corresponding to each hydraulic component to be detected are not within the corresponding standard range when the number of the current hydraulic component is the last number in the preset priority order. If so, a leakage alarm is issued for the hydraulic oil pump.

[0025] Furthermore, the hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

[0026] Furthermore, the hydraulic circuit is composed of various hydraulic components.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] (1) The present invention obtains the motion curve corresponding to each hydraulic component of the standard injection molding machine during operation, stores the operation data in the motion curve into a database, and obtains the real-time motion state of the hydraulic component of the injection molding machine during production and the real-time motor speed under the real-time motion state, so as to use the current load and the real-time speed of the hydraulic component under the current load to match the operating load of the corresponding hydraulic component in the database with the operating speed corresponding to the operating load. If the match is consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained. The leakage state of the hydraulic component is judged by the difference, thereby solving the problem of maintenance delay and maintenance inconvenience caused by the injection molding machine's inability to automatically detect the leakage of its own hydraulic circuit, and greatly improving the performance and production speed of the machine;

[0029] (2) The present invention obtains the number of the hydraulic component to be detected (the number of the hydraulic component to be detected can be set according to demand), and according to the preset priority order of the hydraulic component numbers, obtains the number of the hydraulic component to be detected as the current hydraulic component number, and enters step S2 to determine the leakage status of each hydraulic component to be detected, thereby greatly improving the flexibility of detection;

[0030] (3) When the difference values corresponding to the hydraulic components to be tested are not within the corresponding standard range, the present invention issues a leakage alarm to the hydraulic oil pump to achieve comprehensive testing of the hydraulic components;

[0031] (4) The leakage detection method of the present invention can quickly locate the specific hydraulic component with abnormal leakage, eliminating the need for manual regular maintenance and the need for step-by-step investigation after the leak is discovered. When the injection molding machine operates abnormally or consumes abnormal energy, this leak detection function can be used to quickly identify the hydraulic component with abnormal leakage. This reduces human resource loss, lowers the technical and operational difficulty for maintenance service personnel, and makes subsequent maintenance more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a flow chart of a leakage detection method for a hydraulic circuit of an injection molding machine;

[0033] Figure 2 This is a block diagram of a leak detection system for the hydraulic circuit of an injection molding machine. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0035] Example 1

[0036] In order to solve the problem that the injection molding machine industry currently has no machine that can automatically detect abnormal leakage in its own hydraulic circuit, manual detection is required, and there is a lag in maintenance, which leads to additional hydraulic oil leakage when the hydraulic components are worn or damaged, but it cannot be discovered in time. Figure 1 As shown, the present invention proposes a leakage detection method for a hydraulic circuit of an injection molding machine, comprising the steps of:

[0037] S1: Obtaining a motion curve corresponding to each hydraulic component during operation of a standard injection molding machine, and storing the operating data in the motion curve in a database, wherein the motion curve is used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation, and the motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load; the operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number;

[0038] It should be noted that at every moment of the injection molding machine's operation, the hydraulic components have a corresponding motion state. The motion state is reflected by the operating load at the corresponding moment and the corresponding operating speed of the hydraulic components under the operating load. Different motion states correspond to different motor speeds.

[0039] The steps S1 to S2 also include the following steps:

[0040] S11: Acquire the serial number of the hydraulic component to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the serial number of the hydraulic component to be detected as the current hydraulic component number, and enter step S2.

[0041] The present invention obtains the number of the hydraulic component to be detected (the number of the hydraulic component to be detected can be set according to demand), and according to the preset priority order of the hydraulic component numbers, obtains the number of the current hydraulic component to be detected as the current hydraulic component number, and enters step S2 to determine the leakage status of each hydraulic component to be detected, thereby greatly improving the flexibility of detection.

[0042] S2: Acquire the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load;

[0043] S3: Using the current load and the real-time speed of the hydraulic component under the current load, the operating load of the corresponding hydraulic component and the operating speed corresponding to the operating load are matched in the database. If the match is consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained;

[0044] The specific matching method is: the hydraulic element corresponding to the current hydraulic element number, the current load and the real-time speed of the hydraulic element under the current load are matched one by one with the corresponding hydraulic element in the database, the operating load of the hydraulic element and the operating speed corresponding to the operating load. If all are matched, the motor speed corresponding to the operating load and the operating speed matched in the database is obtained.

[0045] When a hydraulic component is configured in a fixed manner, the oil flow required to operate the component at a specific speed under a specific load is fixed, and the speed of the oil supply motor is also fixed. However, if an abnormal leak occurs in the hydraulic circuit of a hydraulic component, the oil flow required to achieve the specified conditions (specific load and specific speed under specific load) increases, and the speed of the oil supply motor also increases.

[0046] Therefore, the motor speed difference under these specific conditions can be used to determine the current leakage of the hydraulic component. If the corresponding "difference" of the hydraulic component is not within the standard range, it is determined that the hydraulic circuit of the hydraulic component is leaking abnormally and an alarm is required for maintenance.

[0047] S4: Determine whether the difference is within the standard range. If not, issue a leakage alarm for the hydraulic component.

[0048] The step S4 further includes the following steps:

[0049] S5: Determine whether the number of the current hydraulic component is the last number in the preset priority sequence. If so, proceed to step S6. If not, set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number and proceed to step S2.

[0050] S6: Determine whether the difference values corresponding to the hydraulic components to be tested are all outside the corresponding standard range. If so, issue a leakage alarm for the hydraulic oil pump.

[0051] When the difference values corresponding to the hydraulic components to be detected are all outside the corresponding standard range, the present invention issues a leakage alarm to the hydraulic oil pump, thereby achieving comprehensive detection of the hydraulic components.

[0052] The hydraulic oil pump, as the output unit of the hydraulic circuit, supplies oil to the hydraulic circuits of all hydraulic components. Therefore, if the hydraulic oil pump leaks, the motor speed required to move all hydraulic components will increase. Therefore, if the "differences" corresponding to all hydraulic components are abnormal, it can be determined that the hydraulic oil pump is leaking, and an alarm repair is required.

[0053] The leak detection method of the present invention can quickly locate the specific hydraulic component with an abnormal leak, eliminating the need for regular manual inspections and the need for step-by-step troubleshooting after a leak is discovered. When an injection molding machine experiences abnormal operation or energy consumption, this leak detection function can be used to quickly identify the leaking hydraulic component. This reduces human resource losses, lowers the technical and operational complexity for maintenance personnel, and facilitates subsequent repairs.

[0054] The hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

[0055] The hydraulic circuit is composed of various hydraulic components.

[0056] The present invention obtains the motion curve corresponding to each hydraulic component of the standard injection molding machine during operation, obtains the operating data in the motion curve and stores it in a database, obtains the real-time motion state of the hydraulic component of the injection molding machine during production and the real-time motor speed under the real-time motion state, and uses the current load and the real-time speed of the hydraulic component under the current load to match the operating load of the corresponding hydraulic component in the database with the operating speed corresponding to the operating load. If the match is consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained. The leakage state of the hydraulic component is judged by the difference, thereby solving the problem of maintenance delay and maintenance inconvenience caused by the injection molding machine's inability to automatically detect the leakage of its own hydraulic circuit, and greatly improving the performance and production speed of the machine.

[0057] Example 2

[0058] like Figure 2 As shown, the present invention also proposes a leakage detection system for a hydraulic circuit of an injection molding machine, comprising:

[0059] A database module is used to obtain motion curves corresponding to each hydraulic component during operation of a standard injection molding machine and store operating data in the motion curves into a database. The motion curves are used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation. The motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load. The operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number.

[0060] The system further comprises:

[0061] The cycle detection module is used to obtain the hydraulic component number to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the number of the hydraulic component to be detected as the current hydraulic component number, and enter the acquisition module.

[0062] An acquisition module is used to obtain the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load;

[0063] a matching module for matching the operating load of the corresponding hydraulic component in the database with the operating speed corresponding to the operating load using the current load and the real-time speed of the hydraulic component under the current load; if the matching is consistent, obtaining the motor speed corresponding to the matched operating load and operating speed in the database, and obtaining the difference between the motor speed and the real-time motor speed;

[0064] The alarm module is used to issue a leakage alarm for the hydraulic component when the difference is not within a standard range.

[0065] The system further comprises:

[0066] A first judgment module is configured to set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number when the number of the current hydraulic component is not the last number in the preset priority sequence;

[0067] The second judgment module is used to judge whether the difference values corresponding to each hydraulic component to be detected are not within the corresponding standard range when the number of the current hydraulic component is the last number in the preset priority order. If so, a leakage alarm is issued for the hydraulic oil pump.

[0068] The hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

[0069] The hydraulic circuit is composed of various hydraulic components.

[0070] It should be noted that the leakage detection system of the present invention further includes a setting module for setting the hydraulic component to be detected, and the setting module also includes:

[0071] Manual one-button detection unit, used to detect the set hydraulic components to be detected in sequence;

[0072] The fully automatic periodic self-test unit is used to set the test time and test the set hydraulic components to be tested in sequence at the set test time.

[0073] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0074] In addition, in the present invention, descriptions such as "first," "second," and "one" are for descriptive purposes only and should not be understood to indicate or imply their relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0075] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0076] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A leakage detection method for a hydraulic circuit of an injection molding machine, characterized in that: Including steps: S1: Obtaining a motion curve corresponding to each hydraulic component during operation of a standard injection molding machine, and storing the operating data in the motion curve in a database, wherein the motion curve is used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation, and the motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load; the operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number; S2: Acquire the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load; S3: Using the current load and the real-time speed of the hydraulic component under the current load, the operating load of the corresponding hydraulic component and the operating speed corresponding to the operating load are matched in the database. If the match is consistent, the motor speed corresponding to the matched operating load and operating speed in the database is obtained, and the difference between the motor speed and the real-time motor speed is obtained; S4: Determine whether the difference is within the standard range. If not, issue a leakage alarm for the hydraulic component. The steps S1 to S2 also include the following steps: S11: Acquire the serial number of the hydraulic component to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the serial number of the hydraulic component to be detected as the current hydraulic component number, and enter step S2.

2. A leakage detection method for a hydraulic circuit of an injection molding machine according to claim 1, characterized in that: The step S4 further includes the following steps: S5: Determine whether the number of the current hydraulic component is the last number in the preset priority sequence. If so, proceed to step S6. If not, set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number and proceed to step S2. S6: Determine whether the difference values corresponding to the hydraulic components to be tested are all outside the corresponding standard range. If so, issue a leakage alarm for the hydraulic oil pump.

3. A leakage detection method for a hydraulic circuit of an injection molding machine according to any one of claims 1 or 2, characterized in that: The hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

4. A leakage detection method for a hydraulic circuit of an injection molding machine according to claim 3, characterized in that: The hydraulic circuit is composed of various hydraulic components.

5. A leakage detection system for a hydraulic circuit of an injection molding machine, characterized in that: include: A database module is used to obtain motion curves corresponding to each hydraulic component during operation of a standard injection molding machine and store operating data in the motion curves into a database. The motion curves are used to reflect the motor speed corresponding to the motion state of the hydraulic component during operation. The motion data corresponding to the motion state includes the operating load of the injection molding machine and the operating speed corresponding to the hydraulic component under the operating load. The operating data includes: the motion data corresponding to the motion state and the motor speed; each hydraulic component corresponds to a hydraulic component number. The cycle detection module is used to obtain the hydraulic component number to be detected, and according to the preset priority order of the hydraulic component numbers, obtain the number of the hydraulic component to be detected as the current hydraulic component number, and enter the acquisition module; An acquisition module is used to obtain the real-time motion state of the hydraulic component corresponding to the current hydraulic component number of the injection molding machine during the production process and the real-time motor speed under the real-time motion state; the motion data corresponding to the real-time motion state includes the current load of the injection molding machine during the production process and the real-time speed of the hydraulic component under the current load; a matching module for matching the operating load of the corresponding hydraulic component in the database with the operating speed corresponding to the operating load using the current load and the real-time speed of the hydraulic component under the current load; if the matching is consistent, obtaining the motor speed corresponding to the matched operating load and operating speed in the database, and obtaining the difference between the motor speed and the real-time motor speed; The alarm module is used to issue a leakage alarm for the hydraulic component when the difference is not within a standard range.

6. A leakage detection system for a hydraulic circuit of an injection molding machine according to claim 5, characterized in that: The system further comprises: A first judgment module is configured to set the number corresponding to the next hydraulic component in the preset priority sequence as the current hydraulic component number when the number of the current hydraulic component is not the last number in the preset priority sequence; The second judgment module is used to judge whether the difference values corresponding to each hydraulic component to be detected are not within the corresponding standard range when the number of the current hydraulic component is the last number in the preset priority order. If so, a leakage alarm is issued for the hydraulic oil pump.

7. A leakage detection system for a hydraulic circuit of an injection molding machine according to any one of claims 5 or 6, characterized in that: The hydraulic components include: a hydraulic oil pump, an injection cylinder, a mold opening and closing cylinder, an ejection cylinder, a whole-movement cylinder, a mold adjustment motor and a material storage motor.

8. A leakage detection system for a hydraulic circuit of an injection molding machine according to claim 7, characterized in that: The hydraulic circuit is composed of various hydraulic components.

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