Multi-station electrical instrument calibration table

Abstract

An electrical instrument verification table comprises a workbench, a plurality of verification sensors are arranged above the workbench side by side, linear guide rails are arranged on the table top of the workbench, a transmission mechanism is arranged between the linear guide rails, a verification platform is connected to the linear guide rails in a sliding mode, the lower portion of the verification platform is connected with the transmission mechanism, and the transmission mechanism is connected with the workbench. A to-be-verified electrical instrument is clamped and fixed on the verification platform, the transmission mechanism drives the verification platform to move along the linear guide rail, the to-be-verified electrical instrument is moved to the position below the corresponding verification sensor, the measured value of the verification sensor and the measured value of the to-be-verified electrical instrument are compared, errors are calculated, and the to-be-verified electrical instrument is verified. And judging whether the precision requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of electrical instrument calibration technology, and in particular to a multi-station electrical instrument calibration bench. Background Technology

[0002] Electrical instruments require regular calibration during use to ensure their reliability and accuracy. For example, existing electricity meters need to be calibrated regularly to check the measurement accuracy of voltage, current, and power. Each item is calibrated independently, and after one item is calibrated, the electricity meter needs to be transferred to another item's calibration platform. This results in low calibration efficiency and high labor intensity for calibration personnel. Secondly, electricity meters are fixed to the calibration platform by clips. Electricity meters of different sizes need to have their clips adjusted or other auxiliary fasteners used for fixing. This results in low calibration efficiency, and frequent adjustments may introduce human error, affecting the accuracy of the calibration results. Utility Model Content

[0003] This utility model provides a multi-station electrical instrument calibration bench to overcome the shortcomings of the prior art.

[0004] The technical solution adopted by this utility model is as follows: a multi-station electrical instrument calibration bench, including a workbench, several calibration sensors arranged side by side on the top of the workbench, a linear guide rail on the workbench surface, a transmission mechanism between the linear guide rails, a calibration platform slidably connected to the linear guide rails, the bottom of the calibration platform being connected to the transmission mechanism, an electrical instrument to be calibrated clamped and fixed on the calibration platform, the calibration platform being moved along the linear guide rails by the transmission mechanism, moving the electrical instrument to be calibrated to below the corresponding calibration sensor, by comparing the measured value of the calibration sensor with the measured value of the electrical instrument to be calibrated, and then by calculating the error, determining whether it meets the accuracy requirements.

[0005] The transmission mechanism includes transmission wheels installed at both ends of the workbench and a transmission belt wrapped around the two transmission wheels. One of the transmission wheels is driven by a motor installed on the workbench, and the transmission belt is fixedly connected to the calibration platform through a connector fixed thereon.

[0006] Several lifting brackets are fixed to the rear of the calibration platform, and the calibration sensors are installed on the lifting brackets one by one.

[0007] The calibration platform includes a slide plate slidably connected to a linear guide rail. A pair of slide rails are provided at the upper end of the slide plate. A first clamping block and a second clamping block are slidably connected to the upper end of the slide rails. A first rack and a second rack are fixed to the bottom of the first and second clamping blocks, respectively. The first rack and the second rack are located inside the slide rails and are connected by gears meshing on the slide plate. A feeding platform is slidably connected to the slide rails and is located between the first and second clamping blocks. A hydraulic cylinder is fixed to the bottom of the slide plate. The piston rod of the hydraulic cylinder is connected to the first clamping block via a connecting block and drives the first clamping block to move along the slide rails. Simultaneously, the first rack drives the second clamping block to move in the opposite direction along the slide rails via gears and the second rack, clamping and fixing the electrical instrument to be calibrated placed on the feeding platform.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. This utility model, by setting up multiple calibration sensors and combining them with the movement of the calibration platform, enables multiple items to be calibrated in a single clamping of electrical instruments. Compared with the prior art, this reduces the labor intensity of calibration personnel and improves calibration efficiency.

[0010] 2. The calibration platform of this utility model is equipped with a pair of freely adjustable clamps, which can meet the needs of quick clamping of electrical instruments of different sizes, further improving calibration efficiency and reducing human error that may be introduced by frequent adjustments. Attached Figure Description

[0011] Figure 1 , 2 This is a schematic diagram of the structure of this utility model;

[0012] Figure 3 , 4 This is a schematic diagram of the verification platform structure of this utility model;

[0013] Figure 5 This is a partial structural schematic diagram of the present invention. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1-5 The present invention will be described in detail with reference to specific embodiments.

[0015] A multi-station electrical instrument calibration bench includes a workbench 1, with several calibration sensors 4 arranged side-by-side on the top of the workbench 1. Linear guide rails 2 are provided on the surface of the workbench 1, and a transmission mechanism 3 is arranged between the linear guide rails 2. A calibration platform 6 is slidably connected to the linear guide rails 2, and the lower part of the calibration platform 6 is connected to the transmission mechanism 3. An electrical instrument to be calibrated is clamped and fixed on the calibration platform 6. The transmission mechanism 3 drives the calibration platform 6 to move along the linear guide rails 2, moving the electrical instrument to be calibrated to below the corresponding calibration sensor 4. By comparing the measured values ​​of the calibration sensor 4 with the measured values ​​of the electrical instrument to be calibrated, and by calculating the error, it is determined whether the accuracy requirements are met.

[0016] In one embodiment, the transmission mechanism 3 includes transmission wheels 3-1 mounted at both ends of the workbench 1 and transmission belts 3-2 wrapped around the two transmission wheels 3-1, and one of the transmission wheels 3-1 is driven by a motor 5 mounted on the workbench 1, and the transmission belt 3-2 is fixedly connected to the calibration platform 6 through a connector 7 fixed thereon.

[0017] In one embodiment, a plurality of lifting brackets 8 are fixed to the rear side of the verification platform 6, and the verification sensors 4 are installed on the lifting brackets 8 one by one.

[0018] In one embodiment, the verification platform 6 includes a slide plate 6-1 slidably connected to a linear guide rail 2. A pair of slide rails 6-2 are provided at the upper end of the slide plate 6-1. A first clamping block 6-3 and a second clamping block 6-4 are slidably connected to the upper end of each slide rail 6-2. A first rack 6-5 and a second rack 6-6 are respectively fixed to the bottom of the first clamping block 6-3 and the second clamping block 6-4. The first rack 6-5 and the second rack 6-6 are located inside the slide rails 6-2. The first rack 6-5 and the second rack 6-6 are connected by a gear 6-1 mounted on the slide plate 6-1. 7. Engaging connection; A feeding platform 6-8 is slidably connected to the slide rail 6-2, and the feeding platform 6-8 is located between the first clamping block 6-3 and the second clamping block 6-4; A hydraulic cylinder 6-9 is fixed at the bottom of the slide plate 6-1, and the piston rod of the hydraulic cylinder 6-9 is connected to the first clamping block 6-3 through the connecting block 6-10, and drives the first clamping block 6-3 to move along the slide rail 6-2. At the same time, the first rack 6-5 drives the second clamping block 6-4 to move in the opposite direction along the slide rail 6-2 through the gear 6-7 and the second rack 6-6, clamping and fixing the electrical instrument to be calibrated placed on the feeding platform 6-8.

[0019] In practical applications, the number of sensors to be verified is determined according to the actual verification requirements. The following is a detailed explanation using the accuracy verification of an electricity meter as an example.

[0020] Ordinary electricity meter calibration must be performed in an environment with a room temperature of 20±2°C. Electricity meter accuracy calibration includes voltage, current, and power measurement accuracy verification. Three lifting supports must be fixed to the back of the workbench, and voltage, current, and power sensors must be installed sequentially on these supports. The electricity meter to be calibrated is then placed and clamped on the feeding platform. The motor is started, moving the electricity meter through the calibration platform to a position below the voltage sensor. Both the voltage sensor and the electricity meter are connected to the same voltage source, which outputs different levels of voltage signals. The actual voltage value measured by the voltage sensor is compared with the voltage display value of the electricity meter to calculate the error and determine if the electricity meter's voltage measurement accuracy meets the requirements. After voltage calibration, the motor is started again to move the electricity meter to a position below the current sensor. The current sensor and the electricity meter are connected in series in a current loop. Different currents are supplied by a current source, and the current sensor measures the actual current value in real time. This value is compared with the current reading of the electricity meter to calculate the error and check the accuracy and stability of the electricity meter's current measurement. After the current verification is completed, the motor is started again to move the energy meter to below the power sensor. The power sensor and the energy meter to be verified are connected to the same circuit. Different voltage, current and power factor conditions are set in the circuit. The power sensor measures the actual power value and compares it with the power measurement result of the energy meter. The error under different power factors and frequencies is analyzed to determine whether the power measurement accuracy of the energy meter is qualified.

[0021] It should be noted that this calibration bench is not limited to the calibration of electricity meters; it can also be used to calibrate multiple items of other instruments. Simply select the corresponding sensor according to the calibration item. It can also be used for the calibration of single-phase instruments.

[0022] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of implementation of the present utility model. Therefore, all equivalent variations made based on the content described in the claims of the present utility model should be included within the scope of the claims of the present utility model.

Claims

1. A multi-station electrical instrument calibration bench, comprising a workbench (1), characterized in that: Several calibration sensors (4) are arranged side by side above the workbench (1). A linear guide rail (2) is provided on the surface of the workbench (1). A transmission mechanism (3) is provided between the linear guide rails (2). A calibration platform (6) is slidably connected to the linear guide rails (2). The lower part of the calibration platform (6) is connected to the transmission mechanism (3). The calibration platform (6) holds and fixes the electrical instrument to be calibrated. The calibration platform (6) is moved along the linear guide rails (2) by the transmission mechanism (3) to move the electrical instrument to be calibrated to the lower part of the corresponding calibration sensor (4). By comparing the measured value of the calibration sensor (4) with the measured value of the electrical instrument to be calibrated, and by calculating the error, it is determined whether the accuracy requirements are met.

2. The multi-station electrical instrument calibration bench according to claim 1, characterized in that: The transmission mechanism (3) includes transmission wheels (3-1) installed at both ends of the workbench (1) and transmission belts (3-2) wrapped around the two transmission wheels (3-1). One of the transmission wheels (3-1) is driven by a motor (5) installed on the workbench (1), and the transmission belt (3-2) is fixedly connected to the calibration platform (6) through a connector (7) fixed thereon.

3. The multi-station electrical instrument calibration bench according to claim 1, characterized in that: Several lifting brackets (8) are fixed on the rear side of the verification platform (6), and the verification sensors (4) are installed on the lifting brackets (8) one by one.

4. The multi-station electrical instrument calibration bench according to claim 1, characterized in that: The verification platform (6) includes a slide plate (6-1) slidably connected to a linear guide rail (2). The upper end of the slide plate (6-1) is provided with a pair of slide rails (6-2). The upper end of the slide rails (6-2) is slidably connected with a first clamping block (6-3) and a second clamping block (6-4) arranged opposite to each other. The bottom of the first clamping block (6-3) and the second clamping block (6-4) are respectively fixed with a first rack (6-5) and a second rack (6-6). The first rack (6-5) and the second rack (6-6) are located inside the slide rails (6-2). The first rack (6-5) and the second rack (6-6) are engaged by a gear (6-7) provided on the slide plate (6-1). Connection; a feeding platform (6-8) is slidably connected to the slide rail (6-2), and the feeding platform (6-8) is located between the first clamping block (6-3) and the second clamping block (6-4); a hydraulic cylinder (6-9) is fixed at the bottom of the slide plate (6-1), and the piston rod of the hydraulic cylinder (6-9) is connected to the first clamping block (6-3) through the connecting block (6-10), and drives the first clamping block (6-3) to move along the slide rail (6-2). At the same time, the first rack (6-5) drives the second clamping block (6-4) to move in the opposite direction along the slide rail (6-2) through the gear (6-7) and the second rack (6-6), clamping and fixing the electrical instrument to be calibrated placed on the feeding platform (6-8).

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