CN213180243U - Novel mechanical water meter calibrating device - Google Patents
Novel mechanical water meter calibrating device Download PDFInfo
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- CN213180243U CN213180243U CN202022081799.5U CN202022081799U CN213180243U CN 213180243 U CN213180243 U CN 213180243U CN 202022081799 U CN202022081799 U CN 202022081799U CN 213180243 U CN213180243 U CN 213180243U
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Abstract
The utility model discloses a novel mechanical type water gauge calibrating installation, including: the water storage tank, the pressure regulating and flow stabilizing tank, the water pump, the water inlet valve, the meter clamping device, the water outlet valve, the detection table, the to-be-detected serial water meter, the flow monitor and the flow standard device are sequentially connected through a water pipe; the meter clamping device is arranged on the detection table, the laser sensor is used for recording the number of rotation turns of the end pointer of the mechanical water meter, the high-precision electronic scale or/and the standard meter are used as a main standard device, automatic flow reading and automatic verification of the water meter are achieved, the error rate is effectively reduced, the verification efficiency is improved, verification personnel are liberated, and the time cost is saved.
Description
Technical Field
The utility model relates to a measurement technical field, it is specific, relate to a novel mechanical type water gauge verification device.
Background
Water meters are instruments for continuously measuring, recording and displaying the volume of water flowing through a measuring sensor under measurement conditions, and are classified into mechanical water meters, mechanical water meters with electronic devices, and electronic water meters, and the mechanical water meters are mainly used in the civil field. The water meters of the water supply and discharge units are measuring instruments for trade settlement of both water supply and discharge parties, and the measuring accuracy and reliability of the water meters are key indexes for measuring the quality of the water meters. The verification work of the water meter is a basic means for checking whether the metering accuracy of the water meter is qualified or not, and comprises 4 verification items, namely appearance, mark and seal, electronic device function, sealing performance and indication error. The water meter indication error verification project is mainly developed by adopting a comparison method, namely based on a continuity equation, the accumulated flow passing through the water meter is equal to the volume passing through the main standard, and therefore the accuracy and the repeatability of the water meter are determined. The indicating error detection is generally used for detecting three flow points of common flow, boundary flow and minimum flow.
At present, the full automation of the water meter calibrating devices of domestic legal metrological calibrating mechanisms and water meter production enterprises is not realized, the calibration is mainly carried out in a manual mode or a semi-automatic mode, the readings of the tested water meters can not be automatically acquired mostly in the calibrating process, manual reading, recording and calculation are needed, the original records and certificates are easy to make mistakes, the calibrating process is long in time consumption, the calibrating capacity is insufficient, and the labor cost is high.
At present, the automatic calibration research of mechanical water meters mainly focuses on the following three automatic reading methods, namely, a camera is adopted to photograph the dial plate of the water meter, and mechanical character wheel images are collected and identified and converted into flow reading, or (and) static positions of pointers before and after calibration are collected and the angles of the pointers are analyzed, so that the displayed flow is identified; the method relates to photographing and image recognition, and has higher requirements on the running speed and the memory of a data acquisition system; in the verification process, the character wheel of the mechanical counter continuously rotates, the number of the shot character wheel can be adjacent 2 half characters instead of a complete character (the numbers above and below the dial jump gap are incomplete), and great difficulty is brought to the image recognition of the character wheel; the stability of the automatic acquisition method is very tested by carrying out angle analysis on the multi-position pointer and calculating the flow indicating value, and once the single-position pointer identifies errors, the whole reading is wrong.
Secondly, by utilizing high-speed camera sampling and dynamic image processing technology, the camera memorizes an image of the plum blossom wheel at the initial verification time, a pulse is sent when the plum blossom wheel rotates to the memorized position, and the pulse number in the verification process is recorded so as to calculate the flow indicating value of the water meter; the method has higher requirements on the running speed and the memory of the data acquisition system, and is very easily interfered by noise, such as light change, dial bubble, dust, vibration and the like, which very affect the camera quality, thereby affecting the automatic reading.
Thirdly, a laser sensor (a Hall sensor or an electromagnetic sensor) is used for collecting the stroke tooth number of the quincuncial wheel of the starting element, a pulse is output every time one tooth is rotated, the pulse number in the verification process is recorded and converted into an accumulated flow reading; the method is very easy to be interfered by noise, such as light change, dial bubble and dust, vibration and the like can interfere signals of the sensor, the signals are easy to lose, the plum blossom wheel is too small in size, and a light source of the sensor is easy to deviate from a sensing area.
In the second and third reading methods, the numbers of teeth, turns or conversion ratios between the rotation speed and the indication value of the water meter flow of the quincunx wheel may be different for each specification and model, and need to be provided by corresponding water meter manufacturers, which brings inconvenience to verification and reduces verification efficiency. Therefore, the above 3 automatic calibration methods have not been widely used in the water meter calibration industry, and are discarded in the test points and test stages, even some calibration mechanisms after purchasing corresponding calibration devices due to unsatisfactory use effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the unsafe problem of examination that traditional water gauge verification method faces, proposed a novel mechanical type water gauge calibrating installation, utilize laser sensor to rotate the number of turns to mechanical type water gauge end position pointer and take notes, use high accuracy electronic scale or/and standard table as main standard ware, realize the automatic reading of flow and the automatic examination of water gauge, effectively reduce the error rate, improve the verification efficiency, liberation examination personnel, save the time cost.
In order to achieve the above technical purpose, the utility model provides a pair of technical scheme is, a novel mechanical type water gauge calibrating installation, including: a water storage tank, a pressure regulating and flow stabilizing tank, a water pump, a water inlet valve, a meter clamping device, a water outlet valve, a detection platform, a to-be-detected serial water meter, a flow monitor and a flow standard device,
the water storage tank is used for storing water, one port of the water storage tank is connected with the water outlet of the water inlet valve through a water conveying pipe, and the other port of the water storage tank is connected with the water inlet of the water pump through the water conveying pipe;
the water pump is used for pumping water out of the water storage tank and is connected with the pressure-regulating and flow-stabilizing tank through a water conveying pipe;
the pressure-regulating and flow-stabilizing groove is used for providing water flow with stable pressure and is connected with the water outlet valve through a water delivery pipe;
the water outlet valve guides the water in the pressure regulating and flow stabilizing groove into the water meter to be detected in series connection and is connected with the meter clamping device through a water conveying pipe;
the meter clamping device is arranged on the detection table and used for fixing the water meter to be detected in series and is connected with one end of the water meter to be detected in series;
the detection table is used for mounting a flow acquisition device, and the flow acquisition device is arranged at the upper end of the series water meter to be detected;
the water meters to be detected in series are used as detected workpieces, are formed by sequentially arranging single water meters to be detected in series through connecting pipes and are connected with the flow monitor;
the flow monitor is used for detecting whether the water flow reaches a flow detection point and whether the water flow is stable in the detection process and sending a detection starting signal; is connected with the flow standard device through a water delivery pipe;
the flow standard is used for measuring the total water flow in the verification time and is connected with the water inlet valve through a water conveying pipe;
the water inlet valve is used for guiding the water body into the water storage tank again to realize water circulation and is connected with the water storage tank through a water conveying pipe.
In the scheme, a programmable controller (a single chip microcomputer or a PLC control system) is adopted to orderly control a water pump, a water inlet valve, a water outlet valve, a flow monitor and a flow standard device which are electrically controlled, and a high-precision electronic scale and a standard meter are used as a main standard device to automatically collect the actual volume of water flowing through the water meter; the method comprises the steps of transmitting a laser sensor light source to any fixed point of a circular area swept by a last pointer of the mechanical water meter by rotating a circle, returning a diffuse reflection light signal, converting the diffuse reflection light signal into an electric signal, wherein the electric signal detected by a photoelectric element is different due to the fact that the color of the pointer and the background color of the area where the pointer is located in the rotating process of the pointer, so that a pulse can be sent when the pointer is rotated to the point where the laser light source is located, namely, a pulse is sent when the pointer rotates for every circle (one circle represents a fixed flow value), the pulse is converted into an accumulated flow indicating value of the meter according to the recorded pulse number, the indicating value error of the detected water meter is calculated by combining with the actual volume measured by a standard device.
Preferably, the flow standard device comprises one or more combinations of an electronic capacity scale and a standard flow meter.
In the scheme, in order to avoid errors, the error of the water meter to be detected can be calculated in a mode of combining the electronic capacity scale and the standard flow meter, and the detection precision is improved.
Preferably, the detection table comprises a base, a supporting rod perpendicular to the base, a cross arm fixedly connected with the top end of the supporting rod, and a plurality of flow collecting devices arranged at the lower end of the cross arm.
In this scheme, the flow acquisition device carries out the adaptability according to the number and the position of the water gauge of waiting to examine and determine of establishing ties and adjusts, can gather the rotation information of the last position pointer of a plurality of water gauges of waiting to examine and determine simultaneously.
Preferably, the upper end of the cross arm is provided with a notch, the notch is provided with a screw for fixing the flow collecting device, the lower end of the cross arm is provided with a sliding groove, and the flow collecting device is connected with the sliding groove in a sliding mode.
In this scheme, when flow acquisition device adjusted to the position of waiting to examine the water gauge directly over, through the position of screw fixed flow acquisition device.
Preferably, the flow collecting device comprises a sliding block connected with the sliding groove in a sliding mode, a connecting rod vertically connected with the sliding block, a base plate fixedly connected with the lower end of the connecting rod and a rotating disc rotatably connected with the base plate, and the laser sensor group is embedded in the rotating disc.
In this scheme, the initial position of adjusting laser group is changeed in the relative chassis rotation of rolling disc.
Preferably, the laser sensor group comprises a main laser sensor and an auxiliary laser sensor, and light sources of the main laser sensor and the auxiliary laser sensor emit light to any fixed point of a circular area swept by a last pointer of the water meter through one rotation.
In the scheme, a laser sensor light source emits light to any fixed point of a circular area swept by a last pointer of the water meter to be detected by rotating a circle, diffuse reflection light signals are returned, and then the diffuse reflection light signals are converted into electric signals.
Preferably, the cross section of the base plate is I-shaped, a notch for accommodating the I-shaped part is formed in the rotating disc, a plurality of cylindrical grooves are radially formed in the bottom end of the base plate, elastic clamping pieces are arranged in the cylindrical grooves, and a plurality of arc-shaped grooves matched with the elastic clamping pieces are formed in the rotating disc.
In the scheme, the rotating disc rotates relative to the chassis, and the rotating precision is determined according to the radial distribution number of the cylindrical grooves, so that the initial position of the laser group is conveniently adjusted.
Preferably, the elastic clamping piece comprises a spring and a steel ball, one end of the spring is fixedly connected with the bottom surface of the cylindrical groove, the other end of the spring is connected with the steel ball, and one third of the diameter of the section of the steel ball falls into the arc-shaped groove.
In the scheme, one third of the diameter of the section of the steel ball falls into the arc-shaped groove, so that the steel ball is convenient to rotate and fix, and the laser sensor group cannot shift due to mechanical vibration in the verification process.
The utility model has the advantages that: the novel mechanical water meter calibrating device designed by the utility model only needs to sense the rotation of the end pointer of the mechanical water meter and transmit the light source of the sensor to any fixed point of a circular area swept by the end pointer through a circle of rotation, and the length of the pointer is larger than the diameter of the plum blossom wheel, therefore, the invention greatly enhances the capability of resisting noise interference such as light change, dial bubble, dust, vibration and the like, has low probability of signal loss, can be used for detecting the water meters according to the number of the water meters to be detected, the number and the position of the laser sensors are adaptively adjusted, in order to avoid the loss of pulse signals caused by interference, two laser sensors are arranged to record the number of turns of the rotation of the last pointer, the maximum number of the turns is the final pulse number, the problem of signal loss is effectively avoided, the device has the advantages of simple structure, easy installation, high efficiency, stability, reliability and low cost of the detection mode, and is worth of great popularization and application.
Drawings
Fig. 1 is a schematic structural diagram of a novel mechanical water meter calibrating device of the present invention.
Fig. 2 is a schematic structural diagram of the novel mechanical water meter calibrating device of the present invention.
Fig. 3 is a schematic structural diagram of the novel mechanical water meter calibrating apparatus of the present invention.
Fig. 4 is a schematic structural diagram of the novel mechanical water meter calibrating apparatus of the present invention.
Fig. 5 is a schematic structural view of the inspection table of the present invention.
Fig. 6 is the schematic structural diagram of the flow collecting device of the present invention.
Fig. 7 is a schematic cross-sectional structure diagram of the flow collecting device of the present invention.
The notation in the figure is: 1-water storage tank, 2-pressure regulating and flow stabilizing tank, 3-water pump, 4-water inlet valve, 5-meter clamping device, 6-detection table, 61-base, 62-support rod, 63-cross arm, 64-flow collecting device, 641-slide block, 642-connecting rod, 643-chassis, 644-rotating disc, 645-elastic clamping piece, 646-laser sensor group, 7-to-be-detected series water meter, 8-flow monitor, 91-electronic volume balance, 92-standard flow meter, 93-reversing valve and 10-water outlet valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is described in detail with reference to the accompanying drawings and examples, it should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and does not limit the protection scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention.
Example 1:
as shown in figure 1, a novel mechanical water meter calibrating device comprises a water storage tank 1, a pressure-regulating and flow-stabilizing tank 2, a water pump 3, a water inlet valve 4, a meter clamping device 5, a water outlet valve 10, a detection platform 6, a water meter 7 to be calibrated in series, a flow monitor 8 and a flow standard device, wherein an upper end opening of the water storage tank 1 is connected with the water inlet valve 4 through a water pipe, a lower end opening is connected with a water inlet end of the water pump 3 through a water pipe, an output water end of the water pump 3 is connected with a water inlet end of the pressure-regulating and flow-stabilizing tank through a water pipe, a water outlet end of the pressure-regulating and flow-stabilizing tank is connected with one end of the water outlet valve 10 through a water pipe, the other end of the water outlet valve 10 is connected with the meter clamping device 5, the meter clamping device 5 is arranged on a support rod 62 of the detection platform 6, the other end of the meter clamping device 5 is provided with a plurality of water, the other end of the flow monitor 8 is connected to a flow standard, in this embodiment, the flow standard is an electronic volume scale 91 and a reversing valve 93, the reversing valve 93 has a water inlet end and two water outlet ends, the water inlet end is connected to the flow monitor through a water pipe, one water outlet end is connected to the water inlet valve 4 through a water pipe, and the other water outlet end is connected to the water inlet end of the electronic volume scale 91.
In the embodiment, a programmable controller (a single chip microcomputer or a PLC control system) is adopted to carry out sequential control on a water pump 3, a water inlet valve 4, a water outlet valve 10, a flow monitor 8 and a flow standard device which are electrically controlled, and a high-precision electronic scale is used as a main standard device to automatically collect the actual volume of water flowing through a water meter; the method comprises the steps of transmitting a laser sensor light source to any fixed point of a circular area swept by a last pointer of the mechanical water meter by rotating a circle, returning a diffuse reflection light signal, converting the diffuse reflection light signal into an electric signal, wherein the electric signal detected by a photoelectric element is different due to the fact that the color of the pointer and the background color of the area where the pointer is located in the rotating process of the pointer, so that a pulse can be sent when the pointer is rotated to the point where the laser light source is located, namely, a pulse is sent when the pointer rotates for every circle (one circle represents a fixed flow value), the pulse is converted into an accumulated flow indicating value of the meter according to the recorded pulse number, the indicating value error of the detected water meter is calculated by combining with the actual volume measured by a standard device.
As shown in fig. 5, the detecting table 6 comprises a base 61, a supporting rod 62 perpendicular to the base 61, a cross arm 63 fixedly connected with the top end of the supporting rod 62, and a plurality of flow rate collecting devices 64 arranged at the lower end of the cross arm 63, the upper end of the cross arm 63 is provided with a notch on which a screw for fixing the flow rate collecting device 64 is arranged, the lower end of the cross arm 63 is provided with a sliding groove, the flow rate collecting device 64 is slidably connected with the sliding groove, as shown in fig. 6, the flow rate collecting device 64 comprises a sliding block 641 slidably connected with the sliding groove, a connecting rod 642 perpendicularly connected with the sliding block 641, a base 643 fixedly connected with the lower end of the connecting rod 642, and a rotating disc 644 rotatably connected with the base 643, a laser sensor group 646 is embedded in the rotating disc 644, the laser sensor group 646 comprises a main laser sensor and an auxiliary laser sensor, the light source of the main laser sensor and the auxiliary laser sensor is emitted, in this embodiment, the number of the flow rate collection devices 64 is four, and when the flow rate collection devices 64 are adjusted to the position right above the water meter to be detected, the position of the flow collecting device 64 is fixed by a screw, the laser sensor light source emits light to any fixed point of a circular area swept by a circle of rotation of a last-position pointer of the water meter to be detected, the diffuse reflection light signal is returned, the diffuse reflection light signal is converted into an electric signal, the electric signal detected by the photoelectric element is different due to the difference between the color of the pointer and the background color of the area where the pointer is located during the rotation of the pointer, so that a pulse can be sent when the pointer is rotated to the point where the laser light source is located, that is, a pulse is sent out when the pointer rotates one circle (one circle represents a fixed flow value), when pulse information is actually calculated, signal loss is prevented, and the maximum pulse number collected by the main laser sensor and the auxiliary laser sensor is taken as the final pulse number.
As shown in fig. 7, the cross section of the base plate 643 is i-shaped, a notch for accommodating the i-shaped portion is formed in the rotating plate 644, a plurality of cylindrical grooves (not shown) are radially formed at the bottom end of the base plate 643, elastic fasteners 645 are respectively arranged in the plurality of cylindrical grooves, each elastic fastener 645 comprises a spring and a steel ball, one end of each spring is fixedly connected with the bottom surface of each cylindrical groove, the other end of each spring is connected with the steel ball, one third of the diameter of the cross section of each steel ball falls into the arc-shaped groove, and the rotating plate 644 is provided with a plurality of arc-shaped grooves (not shown) matched with the elastic; the rotating disc 644 rotates relative to the base disc 643, the rotating precision is determined according to the radial distribution number of the cylindrical grooves, the initial position of the laser set is convenient to adjust, one third of the diameter of the section of the steel ball falls into the arc-shaped groove, and rotation and fixation are convenient, so that the displacement of the sensor set caused by mechanical vibration in the verification process is avoided.
Example 2:
as shown in fig. 2, the embodiment 2 has substantially the same structure as the embodiment 1, except that the flow standard device is a standard flow meter 92, and the standard flow meter 92 is disposed between the water inlet valve 4 and the flow monitor 8 through a water pipe.
Example 3:
as shown in fig. 3, the structure of embodiment 3 is substantially the same as that of embodiment 1, except that the flow calibrator is a combination of an electronic volume scale 91 and a standard flow meter 92, the electronic volume scale 91 is matched with a reversing valve 93, the standard flow meter 92 is arranged between the reversing valve 93 and the flow monitor 8 through a water pipe, one water outlet end of the reversing valve 93 is connected with the water inlet valve 4 through the water pipe, the other water outlet end is connected with a water inlet end of the electronic volume scale 91, an average value of water flows per unit time T of the electronic volume scale 91 and the standard flow meter 92 is taken as a standard value of the water flows per unit verification time, and the standard value is compared with the acquired detection value of the water meter to be verified to obtain an indication error of the water meter to be verified.
Example 4:
as shown in fig. 4, the structure of embodiment 4 is substantially the same as that of embodiment 1, except that the flow standard is a combination of an electronic volume scale 91 and a standard flow meter 92, the electronic volume scale 91 is matched with a reversing valve 93, the standard flow meter 92 is arranged between the reversing valve 93 and the water inlet valve 4 through a water pipe, a water inlet of the reversing valve 93 is connected with the flow monitor 8 through the water pipe, a water outlet is connected with a water inlet of the electronic volume scale 91, and within a verification time T, by the control action of the diverter valve 93, first, the standard flow meter 92 verifies the time T1, and then the electronic capacity scale 91 tests the time T2, T = T1+ T2, the sum of the water flow detected by the standard flow meter 92 and the electronic capacity scale 91 is taken as a standard value of the water flow in the unit testing time T, and the standard value is compared with the detected value of the collected water meter to be tested for calculation to obtain the indicating value error of the water meter to be tested.
The above-mentioned embodiment does the utility model relates to a novel mechanical type water gauge verification device's preferred embodiment is not injecing with this the utility model discloses a concrete implementation scope, the utility model discloses a scope includes and is not limited to this embodiment, and the all according to the utility model discloses an equivalent change that shape, structure were made is all in the protection scope.
Claims (8)
1. The utility model provides a novel mechanical type water gauge calibrating installation which characterized in that, including: a water storage tank, a pressure regulating and flow stabilizing tank, a water pump, a water inlet valve, a meter clamping device, a water outlet valve, a detection platform, a to-be-detected serial water meter, a flow monitor and a flow standard device,
the water storage tank is used for storing water, one port of the water storage tank is connected with the water outlet of the water inlet valve through a water conveying pipe, and the other port of the water storage tank is connected with the water inlet of the water pump through the water conveying pipe;
the water pump is used for pumping water out of the water storage tank and is connected with the pressure-regulating and flow-stabilizing tank through a water conveying pipe;
the pressure-regulating and flow-stabilizing groove is used for providing water flow with stable pressure and is connected with the water outlet valve through a water delivery pipe;
the water outlet valve guides the water in the pressure regulating and flow stabilizing groove into the water meter to be detected in series connection and is connected with the meter clamping device through a water conveying pipe;
the meter clamping device is arranged on the detection table and used for fixing the water meter to be detected in series and is connected with one end of the water meter to be detected in series;
the detection table is used for mounting a flow acquisition device, and the flow acquisition device is arranged at the upper end of the series water meter to be detected;
the water meters to be detected in series are used as detected workpieces, are formed by sequentially arranging single water meters to be detected in series through connecting pipes and are connected with the flow monitor;
the flow monitor is used for detecting whether the water flow reaches a flow detection point and whether the water flow is stable in the detection process and sending a detection starting signal; is connected with the flow standard device through a water delivery pipe;
the flow standard is used for measuring the total water flow in the verification time and is connected with the water inlet valve through a water conveying pipe;
the water inlet valve is used for guiding the water body into the water storage tank again to realize water circulation and is connected with the water storage tank through a water conveying pipe.
2. A novel mechanical water meter calibration device as claimed in claim 1, wherein said flow calibrator comprises one or more combinations of an electronic volume scale and a standard flow meter.
3. The novel mechanical water meter calibrating device according to claim 1, wherein the test table comprises a base, a support rod perpendicular to the base, a cross arm fixedly connected with the top end of the support rod, and a plurality of flow collecting devices arranged at the lower end of the cross arm.
4. A novel mechanical water meter calibrating device according to claim 3, wherein a notch is formed in the upper end of the cross arm, a screw for fixing the flow collecting device is arranged on the notch, a sliding groove is formed in the lower end of the cross arm, and the flow collecting device is slidably connected with the sliding groove.
5. The novel mechanical water meter calibrating device according to claim 1, 3 or 4, wherein the flow collecting device comprises a sliding block connected with the sliding groove in a sliding manner, a connecting rod vertically connected with the sliding block, a base plate fixedly connected with the lower end of the connecting rod, and a rotating disc rotatably connected with the base plate, and the rotating disc is embedded with a laser sensor group.
6. A novel mechanical water meter calibrating device as claimed in claim 5, wherein the laser sensor group comprises a main laser sensor and an auxiliary laser sensor, and light sources of the main laser sensor and the auxiliary laser sensor emit light to any fixed point of a circular area swept by a last pointer of the water meter through one rotation.
7. A novel mechanical water meter calibrating device according to claim 5,
the section on chassis is worker shape, is equipped with the notch that holds worker shape portion in the rolling disc, and the bottom on chassis radially is provided with a plurality of cylindrical slots, and is a plurality of the cylindrical slot is internal all to be provided with elasticity fastener, the rolling disc is provided with the arc wall of a plurality of matching elasticity fasteners.
8. A novel mechanical water meter calibrating device according to claim 7, characterized in that the elastic clamping member comprises a spring and a steel ball, one end of the spring is fixedly connected with the bottom surface of the cylindrical groove, the other end of the spring is connected with the steel ball, and one third of the diameter of the section of the steel ball falls into the arc-shaped groove.
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| CN202022081799.5U CN213180243U (en) | 2020-09-21 | 2020-09-21 | Novel mechanical water meter calibrating device |
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| CN202022081799.5U CN213180243U (en) | 2020-09-21 | 2020-09-21 | Novel mechanical water meter calibrating device |
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| CN213180243U true CN213180243U (en) | 2021-05-11 |
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