A domestic threshold comparator modification tool

Abstract

The present application belongs to the technical field of threshold comparator, and particularly relates to a domestic threshold comparator modification tool. The present application comprises a control cabinet and a stepping motor, the control cabinet is internally integrated with a current output module, a measurement module and a control module, the stepping motor is connected with a sliding rheostat on the threshold comparator, and is used for adjusting the set value of the threshold comparator. The present application can quickly realize the quick viewing and modification of the set value, can quickly convert the threshold value, modify the threshold value and view the threshold value, is portable, simple to operate and convenient to read, and thus one person can quickly complete the threshold comparator set value modification work, the work efficiency is improved, and the equipment damage rate is reduced.

Description

Technical Field

[0001] This invention belongs to the field of threshold comparator technology, specifically relating to a domestically produced threshold comparator modification tool. Background Technology

[0002] In a certain project, based on the equipment safety level classification, a large number of detection points belong to the safety-level control system. The field detection instrument signals are directly transmitted to the safety-level control cabinet via nuclear-grade cables. After passing through an isolation distributor, the field detection instrument signals are sent to the safety-level control panel and the non-safety DCS system for display, and to the threshold comparator for threshold judgment to output alarms and interlock commands.

[0003] Due to the large number of safety-level points in this project, thousands of threshold comparators are used in the safety-level control system. During the use of these threshold comparators, a standard loop calibrator and a multimeter are required, along with manual threshold conversion calculations and adjustments to the threshold resistors for threshold setting and alarm trigger verification. However, during commissioning, the connection between the standard meter and the threshold comparator presents several challenges: inconvenient wiring, frequent disconnection of the original threshold comparator wiring, complex connectors, error-prone manual threshold conversion, and low accuracy of manual adjustments. In later maintenance, two standard instruments need to be connected to the threshold comparator, making it difficult to view and modify setpoints, thus hindering the speed of maintenance and repair.

[0004] 1. Because modifying the threshold of the threshold comparator requires simultaneously outputting a standard signal and measuring a voltage signal, two standard meters are needed. 2. Standard meters come with measuring probes, which are long, thin probes. These probes cannot be directly connected to the threshold comparator channel for two reasons: ① The probe length is fixed, and the installed threshold comparator has limited space in the cabinet, making it impossible to connect probes of that length; ② The diameter of the probe tip is too long and incompatible with the threshold comparator's wiring channel, preventing connection. 3. The threshold provided by the process is often a constant process parameter, while the threshold measured by the threshold comparator is a voltage signal. Therefore, each time the threshold provided by the process engineer is received, it must be manually converted to the corresponding voltage value. Based on these three reasons, without a dedicated debugging tool suitable for the threshold comparator and standard meters, debugging and maintenance must be carried out by using two standard meters simultaneously, manually converting the threshold, and frequently disconnecting and reconnecting wires. This increases the difficulty of debugging and the risk of human error, making it difficult to guarantee the equipment's operational requirements. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a domestically produced threshold comparator modification tool that can quickly view and modify set values, quickly convert, modify, and view thresholds. It is portable, easy to operate, and convenient to read, allowing one person to quickly complete the threshold comparator set value modification work, improving work efficiency and reducing equipment damage rate.

[0006] The technical solution adopted in this invention is as follows:

[0007] A domestically produced threshold comparator modification tool includes a control cabinet and a stepper motor. The control cabinet integrates a current output module, a measurement module, and a control module. The stepper motor is connected to a sliding rheostat on the threshold comparator for adjusting the set value of the threshold comparator.

[0008] The control cabinet is equipped with a second switch button on the outside. The second switch button is connected to the current output module inside the control cabinet, and the current output value is switched by the external second switch button.

[0009] The current output module is connected to a quick-connect plug via an output current port, and the quick-connect plug is matched with a socket on the threshold comparator.

[0010] The current output module can output 4 mA and 20 mA DC current with an accuracy of 0.1%.

[0011] The control cabinet is equipped with a first switch button on the outside. The first switch button is connected to the measurement module inside the control cabinet and the measurement module is controlled by the first switch button.

[0012] The measurement module is connected to the measurement terminal, which is matched with the socket on the threshold comparator. The measurement module is used to acquire and process voltage and current signals.

[0013] The front face of the control cabinet is equipped with a main display screen and a keyboard. The main display screen is used to display parameters such as the current threshold A, the upper limit of the range B, the lower limit of the range C, the threshold setting D, and the angle compression coefficient, and the relevant parameters are input through the keyboard. The bottom of the control cabinet is equipped with a Type-C charging port for charging the current output module.

[0014] The control module is connected to the stepper motor via a flexible cable to control the stepper motor's movement.

[0015] The upper limit of the measurement range B is a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the lower limit of the measurement range C is a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the threshold setting D is a value manually input via the keyboard, ranging from -9999.99 to 9999.99.

[0016] The process threshold and voltage threshold are converted by a microcontroller. The calculated threshold and the measured threshold are compared in a loop. The stepper motor rotation angle is calculated by using the coefficient of the relationship between the stepper motor rotation angle and the voltage threshold, and the difference between the rotation coefficient and the threshold.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The present invention provides a domestic threshold comparator modification tool, which can replace the function of modifying the threshold by connecting two standard meters, a standard loop calibrator and a multimeter, to the threshold comparator, thus avoiding the need to use two standard meters at the same time and disconnect and reconnect the threshold comparator.

[0019] (2) The present invention provides a domestic threshold comparator modification tool, which can replace the standard meter to output standard signals and measure, automatically convert between voltage threshold and process threshold, automatically adjust the threshold potentiometer, and quickly, simply, accurately and efficiently connect with the threshold comparator. It enables one person to quickly complete the setting and modification of the internal parameters of the threshold comparator, improves the ease of work, the accuracy of threshold setting, reduces the labor intensity of operators and improves work efficiency.

[0020] (3) The present invention provides a domestic threshold comparator modification tool that can be quickly connected to the threshold comparator. The device connection can be completed by plugging and unplugging the quick-connect terminal, which is suitable for any working environment.

[0021] (4) The present invention provides a domestic threshold comparator modification tool, which can not only modify the threshold comparator, but also output 4 mA and 20 mA standard current signals and measure 0-10V voltage signals, with rich functions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a domestically produced threshold comparator modification tool provided by the present invention.

[0024] In the diagram: 1-Measurement terminal, 2-First switch button, 3-Quick plug, 4-Main display screen, 5-Second switch button, 6-Keyboard, 7-Type-C charging port, 8-Stepper motor, 9-Flexible cable. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figure 1 As shown, this invention provides a domestically produced threshold comparator modification tool for precisely controlling and adjusting the parameters of the threshold comparator. It includes a control cabinet and a stepper motor 8. The control cabinet integrates a current output module, a measurement module, and a control module.

[0029] The control cabinet is equipped with a second switch button 5 on the outside. The second switch button is connected to the current output module inside the control cabinet. The current output value is switched by the external second switch button 5. The current output module is connected to the quick plug 3 through the output current port. The quick plug 3 is matched with the socket on the threshold comparator. The current output module can output 4 mA and 20 mA DC current with an accuracy of 0.1%.

[0030] The control cabinet is equipped with a first switch button 2 on the outside. The first switch button 2 is connected to the measurement module inside the control cabinet and controls the measurement module through the first switch button 2. The measurement module is connected to the measurement terminal 1, which is matched with the socket on the threshold comparator. The measurement module is used to collect and process voltage and current signals.

[0031] The front face of the control cabinet is equipped with a main display screen 4 and a keyboard 6. The main display screen 4 is used to display parameters such as the current threshold A, the upper limit of the range B, the lower limit of the range C, the threshold setting D, and the angle compression coefficient, and the relevant parameters are input through the keyboard 6. The bottom of the control cabinet is equipped with a Type-C charging port 7 for charging the current output module.

[0032] The control module is connected to the stepper motor 8 via a flexible cable 9 to control the movement of the stepper motor 8; the stepper motor 8 is connected to a sliding rheostat on the threshold comparator to adjust the set value of the threshold comparator.

[0033] The upper limit of the measurement range B: a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the lower limit of the measurement range C: a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the threshold setting D: a value manually input via the keyboard, ranging from -9999.99 to 9999.99.

[0034] The process threshold and voltage threshold are converted using a microcontroller. The calculated threshold and the measured threshold are compared using a loop. The stepper motor rotation angle is calculated using the coefficient between the stepper motor rotation angle and the voltage threshold, and the difference between the rotation coefficient and the threshold. Specifically:

[0035] Determine the calculated value E:

[0036]

[0037] The calculated value E ranges from 0 to 6.

[0038] Stepper motor rotation count F: F = EA, where A is the current threshold; when the rotation count F is positive, the stepper motor rotates forward; when the rotation count F is negative, the stepper motor rotates in reverse; determine the rotation angle and voltage ratio G: input via keyboard, range 0.000~6.0000; determine the stepper motor rotation angle H: H = F / G; output through loop calculation: when the error between the detected value and the set value is less than 0.05V, the calculation ends and the stepper motor stops.

[0039] Based on the alarm design principles of the safety-level control system in spent fuel reprocessing plants, alarm signals are categorized into four levels according to urgency: red, yellow, green, and white. Corresponding alarm lights of different colors are installed on the safety-level control panel. Since the field instruments output 4-20mA signals, the alarm lights require the closure of switch contacts to provide power and achieve the desired alarm effect. This necessitates the installation of a corresponding threshold comparator within the safety-level cabinet. When the current reaches a certain value, a switching signal is output to power the alarm light and activate it. Similarly, a switching signal is output to activate the relays of the interlocking equipment. This invention primarily addresses the rapid modification of the threshold comparator and the automatic calculation and conversion of process parameter settings and thresholds. This invention is simple to operate; operators can independently complete the threshold comparator parameter adjustment and debugging tasks. Installation and disassembly are convenient, and it automatically converts process thresholds to voltage thresholds. It is easy to maintain and portable, with strong applicability, meeting the needs of the reprocessing field.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A domestically developed threshold comparator modification tool, characterized in that, It includes a control cabinet and a stepper motor (8). The control cabinet integrates a current output module, a measurement module and a control module. The stepper motor (8) is connected to a sliding rheostat on the threshold comparator to adjust the set value of the threshold comparator. The front face of the control cabinet is provided with a main display screen (4) and a keyboard (6). The main display screen (4) is used to display parameters such as the current threshold A, the upper limit of the range B, the lower limit of the range C, the threshold setting D, and the angle compression coefficient, and the relevant parameters are input through the keyboard (6). The bottom of the control cabinet is provided with a Type-C charging port (7) for charging the current output module. The upper limit of the measurement range B: a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the lower limit of the measurement range C: a value manually input via the keyboard, ranging from -9999.99 to 9999.99; the threshold setting D: a value manually input via the keyboard, ranging from -9999.99 to 9999.

99. The process threshold and voltage threshold are converted using a microcontroller. The calculated threshold and the measured threshold are compared using a loop. The stepper motor rotation angle is calculated using the coefficient between the stepper motor rotation angle and the voltage threshold, and the difference between the rotation coefficient and the threshold. Specifically: Determine the calculated value E: The calculated value E ranges from 0 to 6; Stepper motor rotation number F: F = E - A, where A is the current threshold; when the rotation number F is positive, the stepper motor rotates forward; when the rotation number F is negative, the stepper motor rotates in reverse; determine the rotation angle and voltage ratio G: input via keyboard, range 0.000~6.0000; determine the stepper motor rotation angle H: H = F / G; output through loop calculation: when the error between the detected value and the set value is less than 0.05V, the calculation ends and the stepper motor stops.

2. The domestically produced threshold comparator modification tool according to claim 1, characterized in that, The control cabinet is provided with a second switch button (5) on the outside. The second switch button is connected to the current output module inside the control cabinet. The current output value is switched by the external second switch button (5).

3. The domestically produced threshold comparator modification tool according to claim 2, characterized in that, The current output module is connected to the quick plug (3) through the output current port, and the quick plug (3) is matched with the socket on the threshold comparator.

4. The domestically produced threshold comparator modification tool according to claim 3, characterized in that, The current output module can output 4 mA and 20 mA DC current with an accuracy of 0.1%.

5. The domestically produced threshold comparator modification tool according to claim 1, characterized in that, The control cabinet is provided with a first switch button (2) on the outside. The first switch button (2) is connected to the measurement module inside the control cabinet and the measurement module is controlled by the first switch button (2).

6. The domestically produced threshold comparator modification tool according to claim 5, characterized in that, The measurement module is connected to the measurement terminal (1), which is matched with the socket on the threshold comparator. The measurement module is used to collect and process voltage and current signals.

7. The domestically produced threshold comparator modification tool according to claim 1, characterized in that, The control module is connected to the stepper motor (8) via a flexible cable (9) to control the movement of the stepper motor (8).

8. The domestically produced threshold comparator modification tool according to claim 1, characterized in that, The process threshold and voltage threshold are converted by a microcontroller. The calculated threshold and the measured threshold are compared in a loop. The stepper motor rotation angle is calculated by using the coefficient of the relationship between the stepper motor rotation angle and the voltage threshold, and the difference between the rotation coefficient and the threshold.

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