Batch production tooling fixture and assembly process for sensors used in ultrasonic water meters

Abstract

The present application discloses a mass production tooling fixture and an assembly process for an ultrasonic water meter sensor. A plurality of installation positions are arranged at intervals in the length direction of the base strip; a first through hole is respectively arranged at both ends in the length direction of the installation strip, and fixing through holes corresponding to the installation positions are arranged on the installation strip; two bolts are detachably connected to two first threaded holes on the base strip; a plurality of indexing pins are arranged corresponding to the plurality of fixing through holes on the installation strip. The mass production tooling fixture and the assembly process for the ultrasonic water meter sensor provided by the present invention realize batch operation of the ultrasonic water meter sensor by arranging a plurality of installation positions on the base strip; and the installation strip is detachably connected to the base strip to form a basis for the fixation of the indexing pins; the performance uniformity of the indexing pins is strong. During the adhesive curing process of the piezoelectric ceramic sheet, the indexing pins provide appropriate elastic pressing force, and on the premise of convenient operation, a high-quality adhesive effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic water meter assembly, and particularly relates to a mass production tooling fixture and an assembly process for a sensor used in an ultrasonic water meter. Background Art

[0002] A water meter is an instrument for recording the water flow rate in a closed full pipeline and belongs to a special measuring instrument protected by the "Metrology Law of the People's Republic of China". Along with the gradual enhancement of people's environmental protection awareness, the issue of resource conservation has also been paid more attention. In addition to measuring the water consumption of users, traditional mechanical water meters do not have functions such as data analysis, detection of pipe leakage faults, timing or real-time detection of water meter operation, and remote control. When pipeline faults or water theft by users occur, traditional mechanical water meters cannot detect problems in time. Moreover, traditional mechanical water meters must rely on manual meter reading. With the gradual increase in labor costs, this has greatly increased the costs of water supply companies. In addition to the increase in labor costs, the high error rate and low efficiency brought about by manual meter reading are also problems that need to be solved urgently.

[0003] An ultrasonic water meter is a water meter that analyzes and processes the time difference generated by the change in the speed of an ultrasonic beam when it propagates in the water in the forward and reverse directions to obtain the water flow velocity and further calculate the water flow rate, and can achieve intelligence. Intelligent ultrasonic water meters have begun to be widely used in residential life and industrial production. Although ultrasonic water meters have been developed for many years, they have been restricted by technical stability in the early stage of development and it is difficult to achieve large-scale mass production. The reliability and consistency of ultrasonic sensors determine the transition from a laboratory prototype to mass production and marketization, and ultimately determine the measurement accuracy, penetration rate, and popularity rate of ultrasonic water meters. The reliable performance of ultrasonic sensors depends not only on product design but also on the optimization of mass production tooling fixtures and assembly processes to ensure and achieve. At present, the structure of the fixture used for processing sensors of ultrasonic water meters is relatively complex and the uniformity is poor, which is not conducive to its own processing and operation. Summary of the Invention

[0004] The main purpose of the present invention is to provide a mass production tooling fixture and an assembly process for a sensor used in an ultrasonic water meter, aiming to solve the problem that the structure of the fixture used for processing sensors of existing ultrasonic water meters is relatively complex and the uniformity is poor, which is not conducive to its own processing and operation.

[0005] To achieve the above purpose, the present invention provides a mass production tooling fixture for a sensor used in an ultrasonic water meter, including:

[0006] A base strip, with a plurality of mounting positions arranged at intervals in the length direction, and a first threaded hole is respectively arranged on the upper surfaces at both ends of the length direction of the base strip;

[0007] The installation bar is provided with a first through hole at each of the two ends in the length direction, and the installation bar is provided with fixing through holes corresponding to the installation positions.

[0008] Two bolts respectively pass through one of the first through holes to detachably connect the installation bar to the two first threaded holes on the base bar.

[0009] A plurality of indexing pins are arranged corresponding to the plurality of fixing through holes on the installation bar and form a detachable connection with the fixing through holes.

[0010] Further, the mass production fixture for the ultrasonic water meter sensor further includes a bottom integration plate; the number of the base bars is multiple, the bottom of the base bar is provided with an installation structure arranged along its length direction, the upper surface of the bottom integration plate is provided with a plurality of matching fixing structures corresponding to the installation structure, and the matching fixing structures are spaced at intervals in the width direction.

[0011] Further, the installation position is a through hole penetrating the base bar.

[0012] Further, the indexing pin is an L-shaped self-locking type, the indexing pin includes a main body part and an L-shaped handle arranged in the main body part, and the upper free end of the L-shaped handle is vertically arranged with respect to the installation bar.

[0013] Further, it further includes a jacking bar. A sliding groove is arranged in the length direction of the installation bar, the jacking bar is slidably arranged in the sliding groove, and the upper surface of the jacking bar is provided with a plurality of jacking platforms corresponding to the plurality of L-shaped handles.

[0014] Further, in the length direction of the jacking bar, the intervals between the plurality of jacking platforms and the corresponding L-shaped handles increase progressively.

[0015] Further, the number of the jacking bars is multiple, and one ends of the plurality of jacking bars in the length direction are connected to each other.

[0016] Further, the bolt includes a cap part and a rod part connected to each other. The rod part includes a threaded section and a spring section connected to each other in its length direction. The outer diameter of the threaded section is larger than that of the spring section. A spring is sleeved on the spring section, and the installation bar is fixed between the cap part and the spring; when the threaded section is combined with the first threaded hole, the spring is compressed in the first threaded hole, and when the threaded section is separated from the first threaded hole, the spring jacks up the installation bar, and at this time the indexing pin is separated from the installation position.

[0017] The present invention also provides an assembly process for the ultrasonic water meter sensor, which is applied to the mass production fixture for the ultrasonic water meter sensor described above, and includes:

[0018] S1. Install the indexing pin into the fixed through hole on the mounting bar and adjust the indexing pin to a locked state;

[0019] S2, welding the internal connecting wires to the negative electrode surface and the positive electrode surface of the piezoelectric ceramic sheet respectively, wherein the free ends of the two internal connecting wires are connected;

[0020] S3, loading glue on the negative electrode surface of the piezoelectric ceramic sheet, and bonding the negative electrode surface of the piezoelectric ceramic sheet to the inner bottom of the shell;

[0021] S4, placing the housing bonded with the piezoelectric ceramic sheet into the mounting position of the base bar;

[0022] S5. Install the mounting bar to the base bar by means of bolts, and adjust the indexing pin to a released state;

[0023] S6. After the entire batch production fixture is placed in an oven for drying, the indexing pin is lifted to release the pressure charge;

[0024] S7, separating the indexing pin from the housing, and taking out the housing for inspection;

[0025] S8, completing the welding process of the driving board and the external connecting wires, wherein the free ends of the external connecting wires are connected;

[0026] S9. Place the outer shell into the mounting position of the base bar again, inject sealant into the periphery of the driver board, and finally place the entire batch production fixture into the oven for drying.

[0027] Further, the bolt comprises a cap and a rod connected to each other, the rod comprises a threaded section and a spring section connected to each other in the length direction thereof, the threaded section has a larger outer diameter than the spring section, the spring section is sleeved with a spring, and the mounting bar is fixed between the cap and the spring; when the threaded section is combined with the first threaded hole, the spring is compressed in the first threaded hole, and when the threaded section is disengaged from the first threaded hole, the spring lifts the mounting bar, and at this time the indexing pin is separated from the mounting position;

[0028] The S7 step of the assembly process includes:

[0029] The threaded section of the bolt is separated from the first threaded hole, and the housing is taken out for inspection, wherein the mounting bar floats up under the action of the spring, and the indexing pin is separated from the housing;

[0030] The S9 step of the assembly process includes:

[0031] Put the housing back into the installation position of the base strip, pour sealant around the outer periphery of the drive board, combine the threaded section of the bolt with the first threaded hole. At this time, the indexing pin elastically presses the drive board, and finally put the entire mass production tooling fixture into the oven for drying operation.

[0032] The mass production tooling fixture and assembly process for the sensor of the ultrasonic water meter provided by the present invention realize batch operation of the sensor of the ultrasonic water meter by setting a plurality of installation positions on the base strip; the installation strip is detachably connected to the base strip to form a basis for the fixation of the indexing pin; the indexing pin has strong performance uniformity. During the adhesive curing process of the piezoelectric ceramic sheet, the indexing pin provides appropriate elastic pressing force, and on the premise of convenient operation, a high-quality adhesive effect is achieved. Brief Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the base strip of the mass production tooling fixture for the sensor of the ultrasonic water meter according to an embodiment of the present invention;

[0034] Figure 2 It is a schematic diagram (longitudinal section) of the sensor of the ultrasonic water meter;

[0035] Figure 3 It is a schematic diagram of the indexing pin of the mass production tooling fixture for the sensor of the ultrasonic water meter according to an embodiment of the present invention;

[0036] Figure 4 It is a schematic diagram of the installation strip of the mass production tooling fixture for the sensor of the ultrasonic water meter according to an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter according to an embodiment of the present invention;

[0038] Figure 6 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter according to the second embodiment of the present invention (without installing the lifting strip);

[0039] Figure 7 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter according to the second embodiment of the present invention (with the lifting strip installed);

[0040] Figure 8 It is a schematic side view of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter according to the second embodiment of the present invention (with the lifting strip installed);

[0041] Figure 9 It is a schematic diagram of the installation strip of the mass production tooling fixture for the sensor of the ultrasonic water meter according to the second embodiment of the present invention;

[0042] Figure 10 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter according to the third embodiment of the present invention (longitudinal section);

[0043] Figure 11 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter in the fourth embodiment of the present invention (the lifting bar is not installed);

[0044] Figure 12 It is a schematic diagram of the use of the mass production tooling fixture for the sensor of the ultrasonic water meter in the fourth embodiment of the present invention (the lifting bar is installed).

[0045] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the", "above-mentioned" and "this" used herein may also include the plural forms. It should be further understood that the term "comprising" used in the description of the present invention means the presence of the described features, integers, steps, operations, elements, units, modules and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components and / or their groups. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of one or more related listed items.

[0048] Those skilled in the art of the present technology can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless specifically defined as here.

[0049] Refer to Figures 1 to 12 , in an embodiment of the present invention, a mass production tooling fixture for a sensor of an ultrasonic water meter includes:

[0050] A base bar 100, with a plurality of mounting positions 110 spaced in the length direction, and a first threaded hole 120 is provided on the upper surface at each end of the length direction of the base bar 100;

[0051] The mounting strip 200 is provided with a first through hole 210 at each of the two ends in the length direction, and the mounting strip 200 is provided with fixing through holes 220 corresponding to the mounting positions 110;

[0052] Two bolts 300 respectively pass through one of the first through holes 210 to detachably connect the mounting strip 200 to the two first threaded holes 120 on the base strip 100;

[0053] A plurality of indexing pins 400 are arranged corresponding to the plurality of fixing through holes 220 on the mounting strip 200 and form a detachable connection with the fixing through holes 220.

[0054] In the prior art, the reliable performance of ultrasonic sensors depends on both product design and the optimization of mass production tooling fixtures and assembly processes to ensure and achieve. Currently, the structure of the fixtures used for processing ultrasonic water meter sensors is relatively complex and the uniformity is poor, which is not conducive to the processing and operation of the sensors themselves.

[0055] The sensor 500 for ultrasonic water meter mainly includes a housing 510, a piezoelectric ceramic sheet 520, internal connecting wires 530, external connecting wires 540 and a driving board 550; the piezoelectric ceramic sheet 520 is installed at the inner bottom of the housing 510, the driving board 550 is installed at the inner upper part of the housing 510, the piezoelectric ceramic sheet 520 is connected to the driving board 550 through the internal connecting wires 530, the external connecting wires 540 are connected to the outside of the driving board 550, and the working signal of the sensor 500 for ultrasonic water meter is controlled through the external connecting wires 540. The fixing method of the piezoelectric ceramic sheet 520 to the housing 510 is bonding, and the bonding effect is important for the final performance of the sensor 500 for ultrasonic water meter. During the bonding process between the piezoelectric ceramic sheet 520 and the housing 510, a suitable elastic pressing force needs to be continuously provided to the piezoelectric ceramic sheet 520. In the present invention, when the batch production tooling fixture is in use, the up and down directions are fixed, so a certain direction indication is made in the up and down manner. The batch operation of the sensor 500 for ultrasonic water meter is realized by arranging a plurality of mounting positions 110 on the base strip 100; the mounting strip 200 is detachably connected to the base strip 100 to form a basis for the fixation of the indexing pin 400; the indexing pin 400 has strong performance uniformity, convenient procurement and convenient use. The piezoelectric ceramic sheet 520 is bonded in the housing 510, then the housing 510 is placed in the mounting position 110, and a suitable elastic pressing force is provided by the indexing pin 400. By further defining the structure of the indexing pin 400, a better use effect can be achieved, which will be elaborated in detail in the subsequent embodiments. The purpose of the separation between the indexing pin 400 and the piezoelectric ceramic sheet 520 is to release the charge generated by the piezoelectric effect, and the purpose of the contact between the indexing pin 400 and the piezoelectric ceramic sheet 520 is to perform elastic pressing on the piezoelectric ceramic sheet 520. In this embodiment, the housing 510 is made of polyetheretherketone (PEEK) resin material, the resonant frequency F of the sensor 500 for ultrasonic water meter is 3.7 MHz, the resonant impedance Z is 17 Ω, and the resonant capacitance Ct is 1.45 nF.

[0056] In summary, the batch operation of the sensor 500 for ultrasonic water meter is realized by arranging a plurality of mounting positions 110 on the base strip 100; the mounting strip 200 is detachably connected to the base strip 100 to form a basis for the fixation of the indexing pin 400; the indexing pin 400 has strong performance uniformity, and during the adhesive curing process of the piezoelectric ceramic sheet 520, the indexing pin 400 provides a suitable elastic pressing force, and on the premise of convenient operation, a high-quality adhesive effect is achieved.

[0057] The following describes a typical assembly process of the sensor for ultrasonic water meter:

[0058] During initial installation, first pre-treat the piezoelectric ceramic sheet 520. The piezoelectric ceramic sheet 520 has a folded-back electrode. Remove the electrode oxide layer on the negative electrode surface of the piezoelectric ceramic sheet 520 (such as by grinding on a fine sandpaper platform), thereby increasing the conductivity and flatness of the negative electrode surface of the piezoelectric ceramic sheet 520, and facilitating firm gluing in the later stage. After cleaning the piezoelectric ceramic sheet 520, dry it;

[0059] During welding, use a temperature-adjustable soldering gun. Adjust the temperature at the tip of the soldering gun to about 265 °C, control the solder joints to the minimum, and perform short-time operation within 3 seconds. Weld the two internal connection wires 530 to the negative electrode surface and the positive electrode surface of the piezoelectric ceramic sheet 520 respectively;

[0060] During gluing, prepare the epoxy resin glue according to a mass ratio of 20:1, stir it evenly, place it in a hot air circulation oven and keep it at 60 °C. After fully exhausting the bubbles, complete the glue preparation. Load the glue on the negative electrode surface of the piezoelectric ceramic sheet 520, fit the negative electrode surface of the piezoelectric ceramic sheet 520 to the inner bottom of the housing 510, place the housing 510 in the installation position 110 of the base strip 100, and press the piezoelectric ceramic sheet 520 through the indexing pin 400. Among them, there are various options for the process of pressing by the indexing pin 400. For example, after installing the installation strip 200 on the base strip 100, connect the indexing pin 400 to the fixed through hole 220, and then operate the indexing pin 400 to press the piezoelectric ceramic sheet 520, or connect the indexing pin 400 to the installation strip 200 and then install the installation strip 200 on the base strip 100. At this time, operate the indexing pin 400 to press the piezoelectric ceramic sheet 520;

[0061] During the first curing, put the entire batch production tooling fixture into a hot air circulation oven and keep it at 80 °C for 4 hours, then naturally cool it to room temperature and take it out. Lift the indexing pin 400 to release the pressure. Since the piezoelectric ceramic will be charged when the temperature changes, the two internal connection wires 530 are twisted together during the entire curing process to release the charge,

[0062] During detection, take out the indexing pin 400, take out the housing 510, and test and inspect it with an impedance analyzer. The initial installation of the sensor for the ultrasonic water meter is completed.

[0063] During encapsulation, pass the two internal connection wires 530 through the corresponding pad holes of the driving board 550 respectively, place the driving board 550 at the inner step of the housing 510, solder the internal connection wires 530 firmly with a soldering iron, cut off the redundant internal connection wires 530, weld the external connection wire 540 to the driving board 550 (the ends of the external connection wire 540 are still twisted together to prevent piezoelectric ceramic discharge caused by temperature change), place the housing 510 in the installation position 110 of the base strip 100 again, pour sealant around the periphery of the driving board 550, and finally put the entire batch production tooling fixture into the oven to complete the second curing. During the second curing, it can be required that the external connection wire 540 is perpendicular to the driving board 550.

[0064] Reference Figures 11 to 12 , in one embodiment, the mass production tooling fixture for the ultrasonic water meter sensor further includes a bottom integration plate 600; the number of the base strips 100 is multiple, an installation structure is arranged at the bottom of the base strip 100 along its length direction, a plurality of matching fixing structures corresponding to the installation structure are arranged on the upper surface of the bottom integration plate 600, and the matching fixing structures are arranged at intervals in the width direction thereof.

[0065] For example, if the installation structure is a dovetail groove, then the corresponding matching fixing structure is a dovetail rib. In other embodiments, the connection manner between the base strip 100 and the bottom integration plate 600 can also be diverse. In this embodiment, there are two matching fixing structures on the bottom integration plate 600, so that two base strips 100 can be fixed on the bottom integration plate 600 at the same time. Corresponding to the two base strips 100, there will be two installation strips 200, which improves the use efficiency of the mass production tooling fixture. In other embodiments, the bottom integration plate 600 can have a larger number of matching fixing structures.

[0066] Reference Figure 1 , in one embodiment, the installation position 110 is a through hole penetrating the base strip 100.

[0067] By setting the installation position 110 as a through hole, after the ultrasonic water meter sensor 500 is installed in the installation position 110, the drying process of the ultrasonic water meter sensor 500 is smoother.

[0068] Reference Figures 1 to 5 , in one embodiment, the indexing pin 400 is an L-shaped self-locking type, the indexing pin 400 includes a main body part 410 and an L-shaped handle 420 arranged in the main body part 410, and the upper free end of the L-shaped handle 420 is vertically arranged with the installation strip 200.

[0069] There are many types of indexing pins 400. In this embodiment, restricting the indexing pin 400 to be an L-shaped self-locking type has the advantage of convenient operation. On the one hand, it can be self-locked, and on the other hand, it can directly see from the appearance whether the working state of the indexing pin 400 is released or pressed. Especially the L-shaped handle 420 provides the possibility of operating a plurality of indexing pins 400 in batches. Here, the purpose of lifting the L-shaped handle 420 is to release the charge generated by the piezoelectric effect, and the purpose of lowering the L-shaped handle 420 is to elastically press the piezoelectric ceramic sheet 520.

[0070] Reference Figures 6 to 9, in one embodiment, it further includes a jacking bar 700. A chute 230 is provided in the length direction of the mounting bar 200. The jacking bar 700 is slidably disposed in the chute 230. A plurality of jacking platforms 710 corresponding to the plurality of L-shaped handles 420 are provided on the upper surface of the jacking bar 700.

[0071] In this embodiment, when operating the jacking bar 700, the jacking bar 700 slides in the chute 230, and the jacking platforms 710 at various positions of the jacking bar 700 can perform a jacking operation on the L-shaped handle 420 at the corresponding position, so that a plurality of indexing pins 400 can be batch-operated by operating the jacking bar 700. In some embodiments, the lower end of the jacking bar 700 and the chute 230 form a snap structure, but it does not prevent the jacking bar 700 from sliding therein, thereby improving the installation stability of the jacking bar 700.

[0072] Refer to Figures 6 to 9 , in one embodiment, in the length direction of the jacking bar 700, the intervals between the plurality of jacking platforms 710 and the corresponding L-shaped handles 420 increase.

[0073] In this embodiment, by the position setting, the plurality of jacking platforms 710 act on the L-shaped handles 420 in sequence. Then, when driving the jacking bar 700 to move, it does not move by overcoming the resistance of all the indexing pins 400 at the same time, but only jacks one L-shaped handle 420 at the same moment. Then the difficulty of operating the jacking bar 700 is reduced, and the process of lifting or lowering the L-shaped handle 420 can be smoother, reducing the possibility of damaging the piezoelectric ceramic sheet 520. In this embodiment, the increment size of the intervals between the plurality of jacking platforms 710 and the corresponding L-shaped handles 420 is the diameter of the L-shaped handle 420. The above size setting enables the jacking bar 700 to act on only one L-shaped handle 420 at the same moment, and the action on the plurality of L-shaped handles 420 is coherent and smooth. It should be particularly noted that when the batch production fixture has a plurality of base bars 100, there will be a corresponding plurality of mounting bars 200, and the plurality of mounting bars 200 will correspond to a plurality of jacking bars 700. One ends of the plurality of jacking bars 700 can be connected to each other, so that the plurality of jacking bars 700 can be operated simultaneously.

[0074] Refer to Figures 11 to 12 , in one embodiment, the number of the jacking bars 700 is plural, and one ends of the plurality of jacking bars 700 in the length direction are connected to each other.

[0075] If the number of the lifting bars 700 is multiple, that is to say, the mass production fixture for the sensor of the acoustic water meter further includes a bottom integration plate 600, so that the number of the base bars 100 and the corresponding mounting bars 200 is multiple. In this embodiment, one ends of the lifting bars 700 in the length direction are connected to each other, thus improving the operation convenience. In particular, in combination with the increasing intervals between multiple lifting platforms 710 and the corresponding L-shaped handles 420, the difficulty of operating multiple lifting bars 700 simultaneously is reduced.

[0076] Referring to Figure 10 , in one embodiment, the bolt 300 includes a cap portion 310 and a rod portion 320 connected to each other. The rod portion 320 includes a threaded section 321 and a spring section 322 connected to each other in its length direction. The outer diameter of the threaded section 321 is larger than that of the spring section 322. A spring 330 is sleeved on the spring section 322. The mounting bar 200 is fixed between the cap portion 310 and the spring 330. When the threaded section 321 is engaged with the first threaded hole 120, the spring 330 is compressed in the first threaded hole 120. When the threaded section 321 is disengaged from the first threaded hole 120, the spring 330 lifts the mounting bar 200, and at this time, the indexing pin 400 is separated from the mounting position 110.

[0077] During the installation process, when the threaded section 321 of the bolt 300 is engaged with the first threaded hole 120, the spring 330 is compressed in the first threaded hole 120, and the indexing pin 400 is located in the mounting position 110, so as to elastically press the piezoelectric ceramic sheet 520 in the housing 510. After the piezoelectric ceramic sheet 520 is cured, the threaded section 321 of the bolt 300 is separated from the first threaded hole 120. At this time, the spring 330 lifts the mounting bar 200, and the indexing pin 400 is separated from the mounting position 110, and subsequent processes can be carried out. The process of removing the indexing pin 400 from the mounting bar 200 is omitted, and the use efficiency of the mass production fixture is greatly improved.

[0078] The length of the threaded section 321 can be greater than the height of the sensor for ultrasonic water meters, so that the variability of the bolt 300 during use can be better reflected. By adjusting the degree of engagement between the threaded section 321 and the first threaded hole 120, the function of the indexing pin 400 can be different. When the threaded section 321 is fully engaged with the first threaded hole 120, the indexing pin 400 can be used to elastically press the piezoelectric ceramic sheet 520 during the adhesive curing process of the piezoelectric ceramic sheet 520; when the threaded section 321 is partially engaged with the first threaded hole 120, the indexing pin 400 can be used to elastically press the drive plate 550 during the adhesive curing process of the drive plate 550. For example, the installation process of the sensor for ultrasonic water meters includes initial installation, welding, gluing, first curing, inspection, and encapsulation. During the first curing process, the threaded section 321 is fully engaged with the first threaded hole 120, and at this time, the indexing pin 400 elastically presses the piezoelectric ceramic sheet 520; after the first curing is completed, the housing 510 needs to be removed first for inspection. During this process, by operating the bolt 300 and the support of the spring 330 on the mounting strip 200, the process of removing the indexing pin 400 can be omitted, and the housing 510 can be removed for inspection; when the drive plate 550 is filled with glue, the threaded section 321 is partially engaged with the first threaded hole 120, and the indexing pin 400 elastically presses the drive plate 550 to complete the second curing.

[0079] In one embodiment, a through-hole shaft is provided through the indexing pin 400 in its height direction.

[0080] In this embodiment, by machining a through-hole shaft through the indexing pin 400 in its height direction, its main function is to supply the external connecting wire 540 to restrict it perpendicular to the drive plate 550, providing a certain guarantee for the shape and performance of the sensor for ultrasonic water meters. For example, the indexing pin 400 includes a main body portion 410 and an L-shaped handle 420 provided in the main body portion 410. The L-shaped handle 420 has a through-hole shaft axially penetrating through the part in the main body portion 410, so that the position of the external connecting wire 540 can be restricted during the processing of the external connecting wire 540.

[0081] The present invention also provides an assembly process for a sensor for ultrasonic water meters, which is applied to the mass production fixture of the above-mentioned sensor for ultrasonic water meters, and includes:

[0082] S1. Install the indexing pin 400 in the fixed through-hole 220 on the mounting strip 200 and adjust the indexing pin 400 to the locked state;

[0083] S2. Weld the internal connecting wires 530 to the negative and positive surfaces of the piezoelectric ceramic sheet 520 respectively, wherein the free ends of the two internal connecting wires 530 are combined;

[0084] S3. Load glue on the negative electrode surface of the piezoelectric ceramic sheet 520, and attach the negative electrode surface of the piezoelectric ceramic sheet 520 to the inner bottom of the housing 510;

[0085] S4. Place the housing 510 bonded with the piezoelectric ceramic sheet 520 into the installation position 110 of the base strip 100;

[0086] S5. Install the installation strip 200 on the base strip 100 through the bolt 300, and adjust the indexing pin 400 to the release state;

[0087] S6. After placing the entire mass production tooling fixture into the oven for drying operation, lift the indexing pin 400 to release the piezoelectric charge;

[0088] S7. Separate the indexing pin 400 from the housing 510, and take out the housing 510 for inspection;

[0089] S8. Complete the welding process of the drive board 550 and the external connection wire 540. Among them, the free ends of the external connection wires 540 are combined;

[0090] S9. Place the housing 510 into the installation position 110 of the base strip 100 again, pour sealant around the periphery of the drive board 550, and finally place the entire mass production tooling fixture into the oven for drying operation.

[0091] In this embodiment, in step S5, by adjusting the indexing pin 400 to the release state, the piezoelectric ceramic sheet 520 is elastically pressed, avoiding the situation that the indexing pin 400 irregularly presses the piezoelectric ceramic sheet 520 during the fixing process of the installation strip 200. In step S6, due to the operating characteristics of the indexing pin 400, the operation of releasing the piezoelectric charge can be carried out first, avoiding the situation of accidental electric shock. In step S7, the operation of separating the indexing pin 400 from the housing 510 is optional. The indexing pin 400 can be removed from the installation strip 200. At this time, the fixing through hole 220 can be used as a position limiting mechanism for the external connection wire 540; or by operating the bolt 300, the entire installation strip 200 can be lifted, and the housing 510 can be taken out while avoiding operating all the indexing pins 400.

[0092] In one embodiment, the bolt 300 includes a cap portion 310 and a rod portion 320 connected to each other, the rod portion 320 includes a threaded segment 321 and a spring segment 322 connected to each other in the length direction thereof, the threaded segment 321 has a larger outer diameter than the spring segment 322, the spring segment 322 is sleeved with a spring 330, and the mounting bar 200 is fixed between the cap portion 310 and the spring 330; when the threaded segment 321 is combined with the first threaded hole 120, the spring 330 is compressed in the first threaded hole 120, and when the threaded segment 321 is disengaged from the first threaded hole 120, the spring 330 lifts the mounting bar 200, and at this time, the indexing pin 400 is separated from the mounting position 110;

[0093] The S7 step of the assembly process includes:

[0094] The threaded section 321 of the bolt 300 is separated from the first threaded hole 120, and the housing 510 is taken out for inspection, wherein the mounting bar 200 floats up under the action of the spring 330, and the indexing pin 400 is separated from the housing 510;

[0095] The S9 step of the assembly process includes:

[0096] Place the outer shell 510 into the mounting position 110 of the base bar 100 again, inject sealant into the periphery of the drive plate 550, and engage the threaded section 321 of the bolt 300 with the first threaded hole 120. At this time, the indexing pin 400 elastically presses the drive plate 550. Finally, place the entire batch production fixture into the oven for drying.

[0097] In this embodiment, efficient use of mass production fixtures is achieved through the structure of the bolt 300 and the arrangement of the spring 330 .

[0098] In summary, the batch production tooling fixture and assembly process for ultrasonic water meter sensors provided by the present invention realize batch operation of ultrasonic water meter sensors 500 by setting multiple mounting positions 110 on the base bar 100; and the mounting bar 200 is detachably connected to the base bar 100 to form a basis for fixing the indexing pin 400; the indexing pin 400 has strong performance uniformity, and during the bonding and curing process of the piezoelectric ceramic sheet 520, the indexing pin 400 provides a suitable elastic pressing force, thereby achieving a high-quality bonding effect while being easy to operate.

[0099] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A mass production tooling fixture for an ultrasonic water meter sensor, characterized in that, Comprising: A base strip (100) is provided with a plurality of mounting positions (110) at intervals in the length direction. Upper surfaces at both ends in the length direction of the base strip (100) are respectively provided with a first threaded hole (120). A mounting strip (200) is provided with a first through hole (210) at each of both ends in the length direction. The mounting strip (200) is provided with fixing through holes (220) corresponding to the mounting positions (110). Two bolts (300) respectively pass through one of the first through holes (210) to detachably connect the mounting strip (200) to the two first threaded holes (120) on the base strip (100). A plurality of indexing pins (400) are provided corresponding to the plurality of fixing through holes (220) on the mounting strip (200) and form a detachable connection with the fixing through holes (220). The indexing pin (400) is of L-shaped self-locking type. The indexing pin (400) includes a main body portion (410) and an L-shaped handle (420) provided in the main body portion (410). The upper free end of the L-shaped handle (420) is perpendicularly arranged with respect to the mounting strip (200). The fixture further includes a jacking strip (700). A sliding groove (230) is provided in the length direction of the mounting strip (200). The jacking strip (700) is slidably arranged in the sliding groove (230). Upper surfaces of the jacking strip (700) are provided with a plurality of jacking platforms (710) corresponding to the plurality of L-shaped handles (420). In the length direction of the jacking strip (700), intervals between the plurality of jacking platforms (710) and the corresponding L-shaped handles (420) increase progressively.

2. The mass production tooling fixture for an ultrasonic water meter sensor according to claim 1, characterized in that, The mass production fixture for the ultrasonic water meter sensor further includes a bottom integration plate (600). The number of the base strips (100) is multiple. An installation structure is provided at the bottom of the base strip (100) along its length direction. A plurality of matching fixing structures corresponding to the installation structure are provided on the upper surface of the bottom integration plate (600). The matching fixing structures are arranged at intervals in the width direction thereof.

3. The mass production tooling fixture for an ultrasonic water meter sensor according to claim 1, characterized in that, The mounting position (110) is a through hole penetrating the base strip (100).

4. The mass production tooling fixture for an ultrasonic water meter sensor according to claim 1, characterized in that, The number of the jacking strips (700) is multiple. One ends in the length direction of the plurality of jacking strips (700) are connected to each other.

5. The mass production tooling fixture for an ultrasonic water meter sensor according to any one of claims 1 to 3, characterized in that, The bolt (300) comprises a cap portion (310) and a rod portion (320) which are connected to each other. The rod portion (320) comprises a threaded section (321) and a spring section (322) which are connected to each other in the length direction thereof. The outer diameter of the threaded section (321) is larger than that of the spring section (322). The spring section (322) is sleeved with a spring (330). The mounting bar (200) is fixed between the cap portion (310) and the spring (330). When the threaded section (321) is combined with the first threaded hole (120), the spring (330) is compressed in the first threaded hole (120). When the threaded section (321) is disengaged from the first threaded hole (120), the spring (330) lifts the mounting bar (200). At this time, the indexing pin (400) is separated from the mounting position (110).

6. An assembly process for an ultrasonic water meter sensor, characterized in that, The mass production fixture for the ultrasonic water meter sensor according to claim 1 comprises: S1, installing the indexing pin (400) in the fixed through hole (220) on the mounting bar (200), and adjusting the indexing pin (400) to a locked state; S2, welding the internal connecting wires (530) to the negative electrode surface and the positive electrode surface of the piezoelectric ceramic sheet (520), respectively, wherein the free ends of the two internal connecting wires (530) are connected; S3, loading glue on the negative electrode surface of the piezoelectric ceramic sheet (520), and laminating the negative electrode surface of the piezoelectric ceramic sheet (520) to the inner bottom of the housing (510); S4, placing the housing (510) bonded with the piezoelectric ceramic sheet (520) into the mounting position (110) of the base bar (100); S5. The mounting bar (200) is mounted on the base bar (100) by means of bolts (300), and the lifting bar (700) is operated. The lifting bar (700) slides in the slide groove (230), and the lifting platforms (710) at various locations of the lifting bar (700) can lift the L-shaped handle (420) at the corresponding location. The multiple lifting platforms (710) are arranged so as to act on the L-shaped handle (420) in sequence, respectively, and the indexing pin (400) is adjusted to a released state. S6, lowering the L-shaped handle (420) to elastically press the piezoelectric ceramic sheet (520), placing the entire batch production fixture into an oven for drying, and then lifting the indexing pin (400) to release the piezoelectric ceramic sheet (520); S7, separating the indexing pin (400) from the housing (510), and taking out the housing (510) for testing; S8, completing the welding process of the driving board (550) and the external connection wire (540), wherein the free ends of the external connection wire (540) are connected; S9, placing the housing (510) again into the mounting position (110) of the base bar (100), injecting sealant into the periphery of the driving plate (550), and finally placing the entire batch production fixture into an oven for drying.

7. The assembly process according to claim 6, characterized in that, The bolt (300) comprises a cap portion (310) and a rod portion (320) connected to each other, the rod portion (320) comprises a threaded section (321) and a spring section (322) connected to each other in the length direction thereof, the threaded section (321) has an outer diameter larger than that of the spring section (322), the spring section (322) is sleeved with a spring (330), and the mounting bar (200) is fixed between the cap portion (310) and the spring (330); when the threaded section (321) is combined with the first threaded hole (120), the spring (330) is compressed in the first threaded hole (120), and when the threaded section (321) is disengaged from the first threaded hole (120), the spring (330) lifts the mounting bar (200), and at this time, the indexing pin (400) is separated from the mounting position (110); The S7 step of the assembly process includes: The threaded section (321) of the bolt (300) is separated from the first threaded hole (120), and the housing (510) is removed for inspection, wherein the mounting bar (200) floats upward under the action of the spring (330), and the indexing pin (400) is separated from the housing (510); The S9 step of the assembly process includes: The housing (510) is placed again in the mounting position (110) of the base bar (100), sealant is poured into the outer periphery of the drive plate (550), the threaded section (321) of the bolt (300) is partially engaged with the first threaded hole (120), at which time the indexing pin (400) elastically presses the drive plate (550), and finally the entire batch production fixture is placed in an oven for drying.

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