A method and device for detecting the injection molding quality of ultrasonic water meter body

Abstract

The present invention relates to the technical field of ultrasonic water meters, and discloses a method and device for detecting the injection molding quality of ultrasonic water meter bodies. The ultrasonic signal signal-to-noise ratio and ultrasonic signal strength are introduced as two indicators that can directly and clearly reflect the ultrasonic transmission performance of the meter body. Based on the detection and analysis of the above two indicators, a standard device and system method are designed to achieve a quantitative and objective evaluation of the ultrasonic transmission performance of the meter body, thereby standardizing and accurately detecting the injection molding quality of the meter body. At the same time, the scheme also has the advantages of low cost and low requirements on the working environment, is convenient for use in ultrasonic water meter production lines, and has strong engineering practicality.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic water meters, and in particular to a method and a device for detecting the injection molding quality of an ultrasonic water meter body. Background Art

[0002] The ultrasonic transducer is the core device for signal transmission and reception in ultrasonic water meters. According to different installation methods, ultrasonic transducers can be divided into two types: integrated and independent. The integrated transducer directly bonds the piezoelectric ceramics to the surface of the ultrasonic water meter pipe section. It has the advantages of low cost, small turbulence, and good pipe section reliability. It is the preferred solution for the ultrasonic water meter transducer structure. For the integrated transducer solution, the pipe wall of the water meter body under the piezoelectric ceramics acts as a matching layer. The matching layer is used to improve the efficiency of ultrasonic transmission and reception, and its role is critical. It has relatively high requirements for the injection molding quality of the meter body, so the injection molding quality of the meter body needs to be tested.

[0003] For the quality inspection of the injection molding of the watch body, the technical problem of the existing scheme is that the various non-destructive testing technologies in the industry, such as laser holography, infrared, thermal imaging, and X-ray, all have a common shortcoming - they can only indirectly judge the ultrasonic transmission performance of the watch body by observing the defects such as bubbles and cracks - because there are many bubbles and cracks, the ultrasonic transmission performance of the watch body is judged to be poor. This evaluation principle may have subjective factors, and is not systematic and standardized, so it is impossible to standardize and accurately evaluate the injection molding quality of the watch body. The industry still lacks a solution to achieve evaluation and judgment using quantitative indicators that can directly and clearly reflect the ultrasonic transmission performance of the watch body. Summary of the invention

[0004] In view of the shortcomings and defects of the prior art, the present invention provides a meter body injection molding quality detection device suitable for ultrasonic water meters, introduces ultrasonic signal signal-to-noise ratio and ultrasonic signal intensity, two indicators that can directly and clearly reflect the ultrasonic transmittance performance of the meter body, and designs a systematic and standard solution based on the detection and analysis of the above two indicators to achieve quantitative and objective evaluation of the ultrasonic transmittance performance of the meter body, thereby standardizing and accurately detecting the meter body injection molding quality.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A method for detecting the injection molding quality of an ultrasonic water meter body comprises the following steps:

[0007] S1, installing a standard meter body on the first measuring module, inserting the meter body support beam into the water meter pipe section, with the meter body facing upward, so that the position to be bonded with the piezoelectric ceramic faces the first transducer and the second transducer.

[0008] S2, control the first hydraulic lifting column to extend, so that the first measuring module slides to the leftmost end of the slide rail, and the front end of the meter body support beam is inserted into the opening of the left support arm, thereby forming an "I"-shaped support structure together with the left support arm.

[0009] S3, controlling the second hydraulic lifting column to extend so that the second measuring module descends to contact the meter body.

[0010] S4, adjusting the second hydraulic lifting column according to the pressure sensor, thereby controlling the pressure, so that the soft layer of each transducer is closely fitted to the outer shell of the meter body.

[0011] S5, testing the impedance and phase angle of each transducer through the data processing system to achieve pairing of the first transducer and the third transducer, and the second transducer and the fourth transducer.

[0012] S6, the data processing system applies a sinusoidal wave electrical excitation signal to the first transducer and the second transducer through the wire.

[0013] S7, after being stimulated, the first transducer and the second transducer send out ultrasonic signals, which pass through the soft layer-the outer shell of the surface body-the soft layer, and reach the third transducer and the fourth transducer, thus completing the sending and receiving of the ultrasonic signals.

[0014] S8, the third transducer and the fourth transducer convert the received ultrasonic signal into an electrical signal and transmit it to the data processing system through a wire.

[0015] S9, the oscilloscope module of the data processing system directly obtains the signal strength of the received electrical signal; the data processing system obtains the signal-to-noise ratio of the received signal according to discrete Fourier transform calculation.

[0016] S10, remove the standard table.

[0017] S11, installing the meter body to be tested on the first measuring module, inserting the meter body support beam into the water meter pipe section, with the meter body facing upward, so that the position of the piezoelectric ceramic to be bonded faces the first transducer and the second transducer.

[0018] S12, controlling the first hydraulic lifting column to extend, so that the first measuring module slides to the leftmost end of the slide rail, and the front end of the meter body support beam is inserted into the opening of the left support arm, thereby forming an "I"-shaped support structure together with the left support arm.

[0019] S13, controlling the second hydraulic lifting column to extend so that the second measuring mold descends to contact the meter body.

[0020] S14, adjusting the second hydraulic lifting column according to the pressure sensor, applying the same pressure as in, so that the soft layer of each transducer is closely fitted to the outer shell of the meter body.

[0021] S15, testing the impedance and phase angle of each transducer through the data processing system to achieve pairing of the first transducer and the third transducer, and the second transducer and the fourth transducer.

[0022] S16, the data processing system applies a sinusoidal wave electrical excitation signal to the first transducer and the second transducer through a wire.

[0023] S17, after being stimulated, the first transducer and the second transducer emit ultrasonic signals, which pass through the soft layer-the outer shell of the surface body-the soft layer, and reach the third transducer and the fourth transducer, thus completing the transmission and reception of the ultrasonic signals.

[0024] S18, the third transducer and the fourth transducer convert the received ultrasonic signal into an electrical signal and transmit it to the data processing system through a wire.

[0025] S19, the oscilloscope module of the data processing system directly obtains the signal strength of the received electrical signal; the data processing system obtains the signal-to-noise ratio of the received signal according to discrete Fourier transform calculation.

[0026] S20, if any of the following conditions exists, the injection molding quality of the meter body to be tested is unqualified; otherwise, the injection molding quality of the meter body is determined to be qualified:

[0027] (1)q2<0.9q1;

[0028] (2)w2<0.9w1.

[0029] A device for detecting the injection molding quality of an ultrasonic water meter body, comprising a measuring system and a data processing system;

[0030] The measuring system comprises a base, a supporting frame, a first measuring module and a second measuring module.

[0031] The support frame comprises a left support arm, a right support arm and an upper support beam.

[0032] The first measuring module includes a meter body supporting beam, a meter body supporting arm, a first transducer, a second transducer, and a first hydraulic lifting column.

[0033] The second measuring module includes a transducer installation module, a third transducer, a fourth transducer, a second hydraulic lifting column, and a pressure sensor.

[0034] The surface of each transducer is provided with a soft layer, and the soft layer enables each transducer to be closely fitted to the water meter body.

[0035] The first transducer and the second transducer are embedded and installed on the table body support arm; the support frame is in the shape of a "door", and the two ends of the upper support beam are respectively connected to the top ends of the left support arm and the right support arm; the bottom ends of the left support arm and the right support arm are installed on the base; there is an opening at the lower end of the left support arm; the third transducer and the fourth transducer are embedded and installed below the transducer installation module; the top end of the transducer installation module is connected to the bottom end of the pressure sensor; the top end of the pressure sensor is connected to the bottom end of the second hydraulic lifting column; the top end of the second hydraulic lifting column is installed on the upper support beam; a slide rail is provided on the base; the table body support arm is installed on the slide rail; the left side of the table body support arm is connected to the table body support beam, and the right side is connected to the first hydraulic lifting column; the first hydraulic lifting column is installed on the right support arm; when the table body support arm slides to the leftmost end of the slide rail, the table body support beam is inserted into the opening at the lower end of the left support arm to form an "I"-shaped support structure to support the table body; through wires, the data processing system is electrically connected to the first transducer, the second transducer, the first hydraulic lifting column, the third transducer, the fourth transducer, and the second hydraulic lifting column.

[0036] The lifting and lowering of the second measuring module is controlled by controlling the extension and retraction of the second hydraulic lifting column; the left and right sliding of the first measuring module is controlled by controlling the extension and retraction of the first hydraulic lifting column.

[0037] Preferably, when the water meter body is installed for testing, the meter body support beam is inserted into the water meter pipe section.

[0038] Preferably, the sending and receiving of ultrasonic signals, the pressure applied to the meter body and the extension and retraction of the hydraulic lifting column are controlled by a data processing system; and the impedance and phase angle of each transducer are tested by the data processing system.

[0039] Preferably, the soft layer material includes but is not limited to silicone and rubber.

[0040] The beneficial technical effects of the present invention are as follows: by introducing the ultrasonic signal-to-noise ratio and ultrasonic signal strength, two indicators that can directly and clearly reflect the ultrasonic transmission performance of the meter body, a systematic and standard solution is designed based on the detection and analysis of the above two indicators, which realizes the quantitative and objective evaluation of the ultrasonic transmission performance of the meter body, thereby standardizing and accurately detecting the injection molding quality of the meter body. At the same time, the solution also has the advantages of low cost and low requirements on the working environment, which is convenient for use in the ultrasonic water meter production line and has strong engineering practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the detection device of the present invention.

[0042] Figure 2 It is a schematic diagram of the base and the support frame in the present invention.

[0043] Figure 3 It is a schematic diagram of the first measurement module in the present invention.

[0044] Figure 4 It is a schematic diagram of the second measurement module in the present invention.

[0045] Figure 5 It is an overall flow chart of an embodiment of the present invention.

[0046] Figure numbers: 1 is a data processing system, 2 is a support frame, 3 is a base, 4a is a first measuring module, 4b is a second measuring module, 5 is a right supporting arm, 6 is a slide rail, 7 is an upper supporting beam, 8 is a left supporting arm, 9 is an opening, 10 is a meter body supporting arm, 11a is a first hydraulic lifting column, 12a is a first transducer, 12b is a second transducer, 13 is a meter body supporting beam, 11b is a second hydraulic lifting column, 12c is a third transducer, 12d is a fourth transducer, 14 is a pressure sensor, and 15 is a transducer mounting module. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the present invention.

[0048] Principle of the scheme: Since the ultrasonic signal directly passes through the injection molded meter body, when the meter body has defects such as bubbles, cracks, uneven glass fiber content, uneven density and uneven modulus during injection molding, it will affect the transmission performance of the ultrasonic signal, that is, the transmission performance will be reduced, which will directly lead to low signal strength and signal-to-noise ratio at the signal receiving end. After the piezoelectric ceramics are bonded and the transducer is formed, the signal receiving and sending efficiency of this meter body will be relatively low and will not meet the measurement requirements. Therefore, these two direct and clear quantitative indicators are selected to evaluate and judge the ultrasonic transmission performance. Therefore, based on the above content, the signal strength and signal-to-noise ratio of the signal receiving end of the standard meter body whose injection molding quality is defined as good are first tested, and its test data is used as the standard data; then the signal strength and signal-to-noise ratio of the signal receiving end of the meter body to be tested are tested. When the measured data is lower than 90% of the standard data, it can be judged as an unqualified meter body.

[0049] Example:

[0050] like Figure 1 As shown, a device for detecting the injection molding quality of an ultrasonic water meter body includes a measuring system and a data processing system 1.

[0051] The measuring system includes a base 3, a support frame 2, a first measuring module 4a, and a second measuring module 4b.

[0052] The support frame includes a left support arm 8 , a right support arm 5 and an upper support beam 7 .

[0053] The first measuring module includes a meter body supporting beam 13, a meter body supporting arm 10, a first transducer 12a, a second transducer 12b, and a first hydraulic lifting column 11a.

[0054] The second measuring module includes a transducer installation module 15 , a third transducer 12 c , a fourth transducer 12 d , a second hydraulic lifting column 11 b , and a pressure sensor 14 .

[0055] The surface of each transducer is provided with a soft layer, and the soft layer is used to achieve close contact between each transducer and the water meter body. The soft layer material includes but is not limited to silica gel and rubber.

[0056] like Figures 1 to 4 As shown, the first transducer 12a and the second transducer 12b are embedded and installed on the table body support arm 10; the support frame 2 is in the shape of a "door", and the two ends of the upper support beam 7 are respectively connected to the top of the left support arm 8 and the right support arm 5; the bottom ends of the left support arm 8 and the right support arm 5 are installed on the base 3; the lower end of the left support arm 8 has an opening 9; the third transducer 12c and the fourth transducer 12d are embedded and installed below the transducer installation module 15; the top of the transducer installation module 15 is connected to the bottom of the pressure sensor 14; the top of the pressure sensor 14 is connected to the bottom of the second hydraulic lifting column 11b; the top of the second hydraulic lifting column 11b is installed on the upper support beam 7; A slide rail 6 is provided on the base 3; a table body support arm 10 is installed on the slide rail; the left side of the table body support arm 10 is connected to the table body support beam 13, and the right side is connected to the first hydraulic lifting column 11a; the first hydraulic lifting column 11a is installed on the right support arm 5; when the table body support arm 10 slides to the leftmost end of the slide rail 6, the table body support beam 13 is inserted into the opening 9 at the lower end of the left support arm 8 to form an "I"-shaped support structure to support the table body; through wires, the data processing system 1 is electrically connected to the first transducer 12a, the second transducer 12b, the first hydraulic lifting column 11a, the third transducer 12c, the fourth transducer 12d, and the second hydraulic lifting column 11b respectively.

[0057] The lifting and lowering of the second measuring module 4 b is controlled by controlling the extension and retraction of the second hydraulic lifting column 11 b ; the left and right sliding of the first measuring module 4 a on the slide rail 6 is controlled by controlling the extension and retraction of the first hydraulic lifting column 11 a .

[0058] The data processing system 1 controls the sending and receiving of ultrasonic signals, the pressure applied to the meter body and the extension and retraction of the hydraulic lifting column; and the data processing system 1 tests the impedance and phase angle of each transducer.

[0059] The resonant frequency of each transducer is about 1MHz, 2MHz or 4MHz, and the excitation frequency is the frequency corresponding to the highest transducer signal receiving and transmitting sensitivity, which should be equal to the resonant frequency of each transducer. The amplitude range of the electrical signal of the excitation transducer is 10-20V, which can be adjusted according to the signal strength of the receiving end. In principle, the receiving end signal can be controlled at about 500mV-1V; the excitation frequency range is 7-12, and the signal strength is high and the amplitude is stable at this frequency; the excitation waveform is a sine wave, which has good single frequency and is not easy to excite clutter of other frequencies.

[0060] The resonant frequency of each transducer used in the embodiment is about 2 MHz.

[0061] The first transducer 12a, the second transducer 12b, the third transducer 12c, and the fourth transducer 12d are all transceiver transducers, that is, the transducers can be used as transmitters to convert electrical signals into ultrasonic signals, and can also be used as receivers to convert ultrasonic signals into electrical signals.

[0062] like Figure 5 As shown, a method for detecting the injection molding quality of an ultrasonic water meter body includes the following steps:

[0063] S1, install the standard meter body on the first measuring module 4a, insert the meter body support beam 13 into the water meter pipe section, and face the meter body upward, so that the position to be bonded with the piezoelectric ceramics is directly opposite to the first transducer 12a and the second transducer 12b. The ultrasonic signal transmission performance of these two positions directly affects the signal receiving and transmitting performance of the transducer composed of the subsequent bonding piezoelectric ceramics.

[0064] S2, control the first hydraulic lifting column 11a to extend, so that the first measuring module 4a slides to the leftmost end of the slide rail 6, and the front end of the meter body support beam 13 is inserted into the opening 9 of the left support arm 8, thereby forming an "I"-shaped support structure together with the left support arm 8. The crossbeam part of the "I"-shaped support structure passes through the meter body, providing stable and reliable support for the meter body, and can withstand a certain pressure.

[0065] S3, controlling the second hydraulic lifting column 11b to extend, so that the second measuring module 4b descends to contact the meter body.

[0066] S4, adjusting the second hydraulic lifting column 11b according to the pressure sensor 14, thereby controlling the pressure, so that the soft layer of each transducer fits tightly with the outer shell of the meter body, ensuring that the ultrasonic wave can pass through.

[0067] S5, testing the impedance and phase angle of each transducer through the data processing system 1, and achieving pairing of the first transducer 12a and the third transducer 12c, and the second transducer 12b and the fourth transducer 12d.

[0068] S6, the data processing system 1 applies a 20V, 2MHz, 10-cycle sinusoidal wave electrical excitation signal to the first transducer 12a and the second transducer 12b through the wire.

[0069] S7, the first transducer 12a and the second transducer 12b emit ultrasonic signals after being stimulated, which pass through the soft layer-the outer shell-the soft layer and reach the third transducer 12c and the fourth transducer 12d, completing the transmission and reception of ultrasonic signals.

[0070] S8, the third transducer 12c and the fourth transducer 12d convert the received ultrasonic signal into an electrical signal and transmit it to the data processing system 1 through a wire.

[0071] S9, the oscilloscope module of the data processing system 1 directly obtains that the signal strength q1 of the received electrical signal is 1000mV; the data processing system 1 calculates the signal-to-noise ratio w1 of the received signal according to discrete Fourier transform (DFT) and obtains that it is 60dB.

[0072] Note that, referring to Article 26.3 of the Patent Law, from the perspective of what a person skilled in the art can achieve, as a person skilled in the art who knows all common technical knowledge in the technical field to which the invention belongs before the application date or priority date and has access to all prior arts in the field, it is impossible for him not to know the function and principle of an oscilloscope displaying signal strength, nor is it impossible for him not to know the principle and implementation method of using discrete Fourier transform, an effective tool, to calculate the signal-to-noise ratio. The technical solutions to the above two problems have long been widely used in the industry.

[0073] S10, remove the standard table.

[0074] S11, install the meter body to be tested on the first measuring module 4a, insert the meter body support beam 13 into the water meter pipe section, and face the meter body upward so that the position where the piezoelectric ceramic is to be bonded faces the first transducer 12a and the second transducer 12b.

[0075] S12, control the first hydraulic lifting column 11a to extend, so that the first measuring module 4a slides to the leftmost end of the slide rail 6, and the front end of the meter body support beam 13 is inserted into the opening 9 of the left support arm 8, thereby forming an "I"-shaped support structure together with the left support arm 8.

[0076] S13, controlling the second hydraulic lifting column 11b to extend, so that the second measuring module 4b descends to contact the meter body.

[0077] S14, adjusting the second hydraulic lifting column 11b according to the pressure sensor 14, applying the same pressure as in S4, so that the soft layer of each transducer is closely fitted to the outer shell of the meter body to ensure that the ultrasonic wave can pass through.

[0078] S15, the impedance and phase angle of each transducer are tested by the data processing system 1 to achieve pairing of the first transducer 12a and the third transducer 12c, and the second transducer 12b and the fourth transducer 12d.

[0079] S16, the data processing system 1 applies a 20V, 2MHz, 10-cycle sinusoidal wave electrical excitation signal to the first transducer 12a and the second transducer 12b through a wire.

[0080] S17, the first transducer 12a and the second transducer 12b emit ultrasonic signals after being stimulated, which pass through the soft layer-the outer shell-the soft layer and reach the third transducer 12c and the fourth transducer 12d, completing the transmission and reception of ultrasonic signals.

[0081] S18, the third transducer 12c and the fourth transducer 12d convert the received ultrasonic signal into an electrical signal and transmit it to the data processing system 1 through a wire.

[0082] S19, the oscilloscope module of the data processing system 1 directly obtains that the signal strength q2 of the received electrical signal is 400mV; the data processing system 1 calculates the signal-to-noise ratio w2 of the received signal as 45dB based on discrete Fourier transform.

[0083] S20, if any of the following conditions exists, the injection molding quality of the meter body to be tested is unqualified; otherwise, the injection molding quality of the meter body is determined to be qualified:

[0084] (1)q2<0.9q1;

[0085] (2)w2<0.9w1.

[0086] The embodiment meets both conditions (1) and (2), so it is determined that the injection molding quality of the watch body to be tested is unqualified.

[0087] The above embodiments are descriptions of specific implementation methods of the present invention rather than limitations of the present invention. Technical personnel in the relevant technical field may make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should be included in the patent protection scope of the present invention.

Claims

1. A method for detecting the injection molding quality of an ultrasonic water meter body, characterized in that: The following steps are involved: S1, installing the standard meter body on the first measuring module, inserting the meter body support beam into the water meter pipe section, with the meter body facing upward, so that the position of the piezoelectric ceramic to be bonded faces the first transducer and the second transducer; S2, control the first hydraulic lifting column to extend, so that the first measuring module slides to the leftmost end of the slide rail, and the front end of the meter body support beam is inserted into the opening of the left support arm, thereby forming an "I"-shaped support structure together with the left support arm; S3, controlling the second hydraulic lifting column to extend so that the second measuring module descends to contact the meter body; S4, adjusting the second hydraulic lifting column according to the pressure sensor, thereby controlling the pressure so that the soft layer of each transducer fits tightly with the outer shell of the meter body; S5, testing the impedance and phase angle of each transducer through the data processing system to achieve pairing of the first transducer and the third transducer, and the second transducer and the fourth transducer; S6, the data processing system applies a sinusoidal electric excitation signal to the first transducer and the second transducer through a wire; S7, after being stimulated, the first transducer and the second transducer send out ultrasonic signals, which pass through the soft layer-the outer shell of the surface body-the soft layer, and reach the third transducer and the fourth transducer, completing the sending and receiving of the ultrasonic signals; S8, the third transducer and the fourth transducer convert the received ultrasonic signal into an electrical signal and transmit the electrical signal to the data processing system through a wire; S9, the oscilloscope module of the data processing system directly obtains the signal strength of the received electrical signal; The data processing system calculates the signal-to-noise ratio of the received signal based on discrete Fourier transform; S10, replace the standard meter with the meter to be tested, repeat steps S1-S9, and obtain the signal strength and signal-to-noise ratio of the meter to be tested; S11, determining the injection molding quality of the surface of the surface to be tested by comparing the signal strength and signal-to-noise ratio of the surface to be tested with that of the standard surface.

2. A device for detecting the injection molding quality of an ultrasonic water meter body, characterized in that: Including measurement system and data processing system; The measuring system comprises a base, a support frame, a first measuring module and a second measuring module; The support frame includes a left support arm, a right support arm and an upper support beam; The first measurement module includes a meter body support beam, a meter body support arm, a first transducer, a second transducer, and a first hydraulic lifting column; The second measuring module includes a transducer installation module, a third transducer, a fourth transducer, a second hydraulic lifting column, and a pressure sensor; Each transducer has a soft layer on its surface, and the soft layer enables each transducer to fit tightly with the water meter body; The first transducer and the second transducer are embedded and installed on the table body support arm; the support frame is in the shape of a "door", and the two ends of the upper support beam are respectively connected to the top ends of the left support arm and the right support arm; the bottom ends of the left support arm and the right support arm are installed on the base; there is an opening at the lower end of the left support arm; the third transducer and the fourth transducer are embedded and installed below the transducer installation module; the top of the transducer installation module is connected to the bottom end of the pressure sensor; the top of the pressure sensor is connected to the bottom end of the second hydraulic lifting column; the top of the second hydraulic lifting column is installed on the upper support beam; a slide rail is provided on the base; the table body support arm is installed on the slide rail; the left side of the table body support arm is connected to the table body support beam, and the right side is connected to the first hydraulic lifting column; the first hydraulic lifting column is installed on the right support arm; when the table body support arm slides to the leftmost end of the slide rail, the table body support beam is inserted into the opening at the lower end of the left support arm to form an "I"-shaped support structure to support the table body; through wires, the data processing system is electrically connected to the first transducer, the second transducer, the first hydraulic lifting column, the third transducer, the fourth transducer, and the second hydraulic lifting column respectively; The lifting and lowering of the second measuring module is controlled by controlling the extension and retraction of the second hydraulic lifting column; the left and right sliding of the first measuring module is controlled by controlling the extension and retraction of the first hydraulic lifting column.

3. The device for detecting the injection molding quality of the ultrasonic water meter body according to claim 2, characterized in that: When installing the water meter body for testing, the meter body support beam is inserted into the water meter pipe section.

4. The device for detecting the injection molding quality of the ultrasonic water meter body according to claim 2, characterized in that: The data processing system controls the sending and receiving of ultrasonic signals, the pressure applied to the meter body, and the extension and retraction of the hydraulic lifting column; and the data processing system tests the impedance and phase angle of each transducer.

5. The device for detecting the injection molding quality of the ultrasonic water meter body according to claim 2, characterized in that: The soft layer material includes but is not limited to silica gel and rubber.

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