An ultrasonic sensor and a manufacturing method thereof

Abstract

The application relates to an ultrasonic sensor and a manufacturing method thereof, which comprises an upper shell and a lower shell, the upper shell is provided with a first connecting assembly, the lower shell is provided with a second connecting assembly matched with the first connecting assembly, the upper shell and the lower shell are matched and connected to form a containing cavity, the containing cavity is provided with silica gel, sound-absorbing cotton and a piezoelectric ceramic sheet connected and arranged in sequence from top to bottom, one end of the silica gel is connected with the upper shell, the lower shell is provided with a mounting groove, the piezoelectric ceramic sheet is located in the mounting groove, the top of the upper shell is provided with a connecting port, the lower shell is further provided with a rivet, and the piezoelectric ceramic sheet and the rivet are connected with the connecting port. The ultrasonic sensor provided by the application adopts the matched connection mode of the upper shell and the lower shell, is more efficient and more convenient to install compared with the traditional combination mode, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultrasonic sensor manufacturing, in particular to an ultrasonic sensor and a manufacturing method thereof. BACKGROUND

[0002] An ultrasonic sensor is a sensor that converts ultrasonic signals into other energy signals (usually electrical signals). Ultrasonic waves are mechanical waves with a frequency higher than 20 kHz. They have the characteristics of high frequency, short wavelength, small diffraction, good directionality, and directional propagation as a ray. Ultrasonic waves have a strong penetrating power for liquids and solids, especially in sunlight opaque solids. When ultrasonic waves encounter impurities or interfaces, they will produce significant reflections and form reflected echoes. When they encounter moving objects, they will produce a Doppler effect. Ultrasonic sensors are widely used in industry, national defense, and biomedicine.

[0003] Most ultrasonic sensors on the market are composed of piezoelectric ceramic sheets, sound-absorbing cotton, and silica gel components connected in sequence. In the manufacturing process, each component requires a separate process for machining, which is relatively complicated and reduces the overall machining efficiency to some extent. In addition, due to environmental and other factors, the frequency signals received by the ultrasonic sensor are not concentrated, so improvements are needed based on existing technology. SUMMARY

[0004] To overcome the deficiencies of the prior art, the present application provides an ultrasonic sensor and a manufacturing method thereof. The upper and lower shells are matched and connected, which is more efficient and easier to install than the traditional combination method, and improves production efficiency.

[0005] To achieve the purpose of the present application, an ultrasonic sensor is provided, comprising an upper shell and a lower shell. The upper shell is provided with a first connecting assembly, and the lower shell is provided with a second connecting assembly matched with the first connecting assembly. The upper and lower shells are matched and connected to form a containing cavity. The containing cavity is provided with silica gel, sound-absorbing cotton, and a piezoelectric ceramic sheet connected in sequence from top to bottom. One end of the silica gel is connected to the upper shell. The lower shell is provided with a mounting groove, and the piezoelectric ceramic sheet is located in the mounting groove. The upper shell is provided with a connecting port at the top, and the lower shell is further provided with a rivet. The piezoelectric ceramic sheet and the rivet are connected to the connecting port.

[0006] Preferably, the thickness of the bottom of the lower shell is 0.6-0.7mm, and the height of the mounting groove is 0.05-0.2mm.

[0007] Preferably, the upper shell is provided with a bending part at both ends, the bending part comprises a first fixed block and a protruding block connected with each other, the protruding block is provided outwardly protruding relative to the first fixed block at the other end, the first fixed block is further connected with the lower shell, the protruding block is located in the accommodating cavity and separates the accommodating cavity into a first connecting cavity and a second connecting cavity connected with each other, the first connecting cavity is connected with the upper shell, and the second connecting cavity is connected with the lower shell.

[0008] Preferably, the lower shell is provided with a stepped groove matched and connected with the first fixed block, the rivet is arranged on the stepped groove, the first fixed block is provided with a connecting hole matched and connected with the rivet, and one end of the connecting hole is further connected with the connecting port.

[0009] Preferably, the first connecting assembly comprises a fixed part and a first connecting part connected with each other, the fixed part is connected with the upper shell, the second connecting assembly comprises a fixed groove, the fixed groove is provided with a second connecting part matched and connected with the first connecting part, when the first connecting assembly is matched and connected with the second connecting assembly, the first connecting part is matched and connected with the second connecting part, the first connecting assembly and the second connecting assembly are both two, and two first connecting assemblies or two second connecting assemblies are arranged at opposite angles.

[0010] Preferably, the first connecting part comprises a first connecting block, a second connecting block and a connecting column, the connecting column is connected with the first connecting block and the second connecting block at both ends respectively, and a connecting groove is formed between the first connecting block and the second connecting block, the second connecting part comprises two oppositely arranged pushing assemblies, the two pushing assemblies can relatively move in the fixed groove, and one end of the two pushing assemblies is located in the connecting groove when the first connecting part is matched and connected with the second connecting part.

[0011] Preferably, the second connecting block is in a conical structure, the pushing assembly comprises an elastic member and a pushing block connected with each other, one end of the elastic member is connected with the inner side wall of the fixed groove, and the pushing block is provided with an inclined section at the end away from the elastic member, and the two inclined sections are connected to form a conical groove when the two pushing blocks are matched and connected.

[0012] Preferably, the second connecting assembly further comprises a second fixed block, the second fixed block is two, the two second fixed blocks are both arranged in the accommodating cavity, and the two second fixed blocks are oppositely arranged and spaced apart from each other, and the first connecting block is located in the space.

[0013] Preferably, the application further provides a manufacturing method of the ultrasonic sensor as described in any of the above embodiments, which is assembled by an ultrasonic sensor automatic dispensing and patching device, the ultrasonic sensor automatic dispensing and patching device comprises a workbench, a bearing device on the workbench, a dispensing device and a first adsorption device, the dispensing device and the first adsorption device are sequentially arranged around the bearing device, the bearing device is provided with a mold cavity and a positioning column in the mold cavity, and specifically comprises the following steps:

[0014] S1: conveying the piezoelectric ceramic sheet to the positioning column in the mold cavity and controlling the bearing device to rotate to the work station where the dispensing device is located; controlling the dispensing device to move towards the positioning column and dispensing on the piezoelectric ceramic sheet, and after the dispensing is completed, controlling the bearing device to rotate to the work station where the first adsorption device is located;

[0015] S2: adsorbing the lower shell by the first adsorption device, and controlling the lower shell to move towards the positioning column, matching and connecting the piezoelectric ceramic sheet and the mounting groove in the lower shell, and connecting the upper shell and the lower shell after the matching and connecting.

[0016] Preferably, the piezoelectric ceramic sheet is matched and connected with the mounting groove by UV glue, and the UV glue comprises the following components: methacrylic acid ester, 20%-45% by weight; cyanoacrylate glue, 10%-25% by weight; polyamide glue, 5%-15% by weight; and vinyl resin, 5%-15% by weight.

[0017] The ultrasonic sensor and the manufacturing method thereof provided by the application have the advantages that: the ultrasonic sensor and the manufacturing method thereof provided by the application adopt the matching and connecting mode of the upper shell and the lower shell, which is more efficient and more convenient to install than the traditional combination mode, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which preferred embodiments of the application are shown. Like reference numerals refer to like elements throughout. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the application. The detailed description sets forth various embodiments of the application in connection with the accompanying drawings.

[0019] Figure 1 A combination schematic diagram of the ultrasonic sensor provided by the embodiment of the application is shown in the figure;

[0020] Figure 2 An explosion schematic diagram of the ultrasonic sensor provided by the embodiment of the application is shown in the figure;

[0021] Figure 3 A cross-sectional schematic diagram of the ultrasonic sensor provided by the embodiment of the application is shown in the figure;

[0022] Figure 4 A cross-sectional schematic diagram of the ultrasonic sensor provided by the embodiment of the application is shown in the figure;Figure 3 Partial enlarged view of part A;

[0023] Figure 5 Whole structure schematic view of the automatic glue sticking device for ultrasonic sensor in the application;

[0024] Figure 6 Whole structure schematic view of the automatic glue sticking device for ultrasonic sensor in the application;

[0025] Figure 7 Structure schematic view of the clamping part in the application;

[0026] Figure 8 Structure schematic view of the first adsorption device in the application;

[0027] Figure 9 Structure schematic view of the glue dispensing device in embodiment 1 of the application;

[0028] Figure 10 Structure schematic view of the glue dispensing device in embodiment 2 of the application;

[0029] In the figure: 1-upper shell, 11-connection port, 12-first fixed block, 13-bump, 14-fixed part, 15-connection part, 2-lower shell, 21-step groove, 22-second fixed block, 23-mounting groove, 24-second connection block, 25-fixed groove, 26-elastic member, 27-pushing block, 28-connection column, 3-connection groove, 4-first adsorption device, 41-first air cylinder, 42-clamping surface, 43-second clamping block, 44-first clamping block, 45-sliding part, 5-glue dispensing mechanism, 51-first connection part, 52-second fixed seat, 53-longitudinal driving mechanism, 54-first support plate, 541-second support plate, 55-sliding assembly, 56-adjusting member, 57-glue gun, 58-baffle, 6-second adsorption device, 61-second conveying device, 62-first fixed seat, 63-first adsorption part, 64-first connection seat, 65-transverse driving mechanism, 7-third adsorption device, 71-bearing device, 72-third conveying device, 8-workbench, 81-feeding disc, 82-first conveying device. DETAILED DESCRIPTION

[0030] The technical solutions of the application will be further described in detail below in combination with the drawings and specific embodiments, so that the skilled in the art can better understand the application and implement it, but the embodiments are not as a limitation of the application.

[0031] Please refer to Figures 1-4The embodiment of the present application provides an ultrasonic sensor, which comprises an upper shell 1 and a lower shell 2, the upper shell 1 is provided with a first connecting assembly, the lower shell 2 is provided with a second connecting assembly matched with the first connecting assembly, the upper shell 1 and the lower shell 2 are matched and connected to form a containing cavity, the containing cavity is provided with silica gel, sound-absorbing cotton and a piezoelectric ceramic sheet connected and arranged in sequence from top to bottom (from the upper shell 1 to the lower shell 2), one end of the silica gel (the silica gel is arranged to eliminate noise of signals received or sent by the sensor, so that the stability of the signals is improved) is further connected with the upper shell 1, the lower shell 2 is provided with a mounting groove 23, the piezoelectric ceramic sheet is located in the mounting groove 23, the top of the upper shell 1 is provided with a connecting port 11 (specifically, the connecting port 11 can be connected by a connecting wire for detection, or the detection can be directly performed through the connecting port 11, and the specific detection is based on actual needs), the lower shell 2 is further provided with a rivet, and the piezoelectric ceramic sheet and the rivet are connected with the connecting port 11 (the connecting mode of the piezoelectric ceramic sheet and the rivet with the connecting port 11 is not limited, and the connection can be performed by a connecting wire or a metal piece).

[0032] The ultrasonic sensor provided by the present application has the advantages that, the upper shell 1 and the lower shell 2 are matched and connected, the efficiency is higher than that of the traditional combination mode, the installation is more convenient, and the production efficiency is improved.

[0033] Please refer to Figures 1-4 In the preferred embodiment, the thickness of the bottom of the lower shell 2 is 0.6-0.7mm, preferably 0.650-0.655mm, the height of the mounting groove 23 is 0.05-0.2mm, preferably 0.05-0.1mm, 0.1-0.2mm or 0.05-0.08mm, the thickness of the bottom of the lower shell 2 is adjusted through the mounting groove 23, so that the frequency received by the sensor is more concentrated, and the detection effect is better. The frequency received by the traditional ultrasonic sensor is 58±0.5KHZ, through multiple artificial or test tests, it is found that the thickness of the bottom of the lower shell 2 is set to 0.650-0.655mm, so that the frequency received by the sensor is more concentrated, and the specific frequency value is 58±0.3KHZ.

[0034] Please refer to Figure 2 In the preferred embodiment, the upper shell 1 is provided with a bending part at both ends, the bending part comprises a first fixed block 12 and a protruding block 13 connected with each other, the other end of the protruding block 13 is outwardly protruding relative to the first fixed block 12, the first fixed block 12 is further connected with the lower shell 2, the protruding block 13 is located in the containing cavity, and the containing cavity is divided into a first connecting cavity and a second connecting cavity connected with each other, the first connecting cavity is connected with the upper shell 1, and the second connecting cavity is connected with the lower shell 2.

[0035] The accommodation cavity is divided into a first connecting cavity and a second connecting cavity, the first connecting cavity mainly places silica gel material, and the second connecting cavity mainly places sound-absorbing cotton material, and the piezoelectric ceramic sheet is installed in the installation groove 23.

[0036] Please refer to Figures 3-4 In a further preferred embodiment, the first connecting assembly includes a fixed part 14 and a first connecting part 15 connected with each other, the fixed part 14 is connected with the upper shell 1, the second connecting assembly includes a fixed groove 25, the fixed groove 25 is provided with a second connecting part 15 matched with the first connecting part 15, and when the first connecting assembly and the second connecting assembly are matched and connected, the first connecting part 15 and the second connecting part 15 are matched and connected. Compared with the traditional assembly process, the sound-absorbing cotton no longer needs to be bonded in the sensor with glue, which saves the cost and improves the installation efficiency to a certain extent;

[0037] The first connecting assembly and the second connecting assembly are both two, the two first connecting assemblies or the two second connecting assemblies are diagonally arranged, and the diagonal arrangement is arranged relative to the center of the upper shell 1 or the center of the lower shell 2 as a reference. By arranging two first connecting assemblies and two second connecting assemblies, the installation and connection of the upper shell 1 and the lower shell 2 are realized by a relatively simple device, the occupied space of the sensor is saved, the structural complexity of the sensor is reduced to a certain extent, the manufacturing cost is lower, and it is more suitable for the future market.

[0038] Please refer to Figures 1-4 In a preferred embodiment, the outer side wall of the lower shell 2 is further provided with a positioning step, the positioning step is multiple, and the positioning step is usually two, which is arranged at both ends of the outer side wall of the lower shell 2.

[0039] Please refer to Figure 4 In a preferred embodiment, the first connecting part 15 includes a first connecting block, a second connecting block 24 and a connecting column 28, the connecting column 28 is connected with the first connecting block and the second connecting block 24 at both ends, and a connecting groove 3 is formed between the first connecting block and the second connecting block 24, the second connecting part 15 includes two oppositely arranged pushing assemblies, the two pushing assemblies can relatively move in the fixed groove 25, and when the first connecting part 15 and the second connecting part 15 are matched and connected, one end of the two pushing assemblies is located in the connecting groove 3.

[0040] Please refer to Figure 4In a further preferred embodiment, the second connecting block 24 is in a conical structure, the pushing assembly comprises an elastic member 26 and a pushing block 27 connected with each other, one end of the elastic member 26 is connected with the inner side wall of the fixed groove 25, and the pushing block 27 is provided with an inclined section at the end away from the elastic member 26, when the two pushing blocks 27 are matched and connected, the two inclined sections are connected to form a conical groove, the elastic member 26 can adopt a spring or other components, and components that can realize elastic function can be used, and the specific components are not limited, through the matching connection of the conical structure of the second connecting block 24 and the conical groove formed by the two pushing blocks 27, the installation speed is higher when the upper shell 1 and the lower shell 2 are matched and connected, and the firmness is better, and the ultrasonic sensor is more convenient to assemble.

[0041] Please refer to Figures 3-4 In a preferred embodiment, the second connecting assembly further comprises a second fixed block 22, the second fixed block 22 is two, both of the two second fixed blocks 22 are arranged in the accommodating cavity, and the two second fixed blocks 22 are oppositely arranged and spaced apart, and the first connecting block is located in the space, the second fixed block 22 is in an L-shaped structure, and the first connecting block is connected with the two oppositely arranged L-shaped second fixed blocks 22, so as to ensure the structural strength of the ultrasonic sensor as a whole.

[0042] Please refer to Figures 1-10 In a preferred embodiment, the application further provides a manufacturing method of the ultrasonic sensor, which is assembled by an ultrasonic sensor automatic dispensing and patching device, the ultrasonic sensor automatic dispensing and patching device comprises a workbench 8, a bearing device 71, a dispensing device and a first adsorption device 4 located on the workbench 8 (the bearing device 71, the dispensing device and the first adsorption device 4 all comprise a driving mechanism for rotating the bearing device 71, and moving the dispensing device and the first adsorption device 4 horizontally or vertically), and the dispensing device and the first adsorption device 4 are sequentially arranged around the bearing device 71, the bearing device 71 is provided with a mold cavity and a positioning column in the mold cavity, and the method comprises the following steps:

[0043] S1: conveying the piezoelectric ceramic sheet to the positioning column in the mold cavity and controlling the bearing device 71 to rotate to the position of the dispensing device (the conveying of the piezoelectric ceramic sheet can adopt a conveying device, and the specific structure is not limited as long as the conveying function of the piezoelectric ceramic sheet is realized); controlling the dispensing device to move towards the positioning column and dispensing on the piezoelectric ceramic sheet, and after the dispensing is completed, controlling the bearing device 71 to rotate to the position of the first adsorption device 4;

[0044] S2: The lower shell is adsorbed by the first adsorption device 4, and the lower shell is controlled to move towards the positioning column, and the piezoelectric ceramic sheet and the mounting groove 23 in the lower shell are matched and connected (when the piezoelectric ceramic sheet and the mounting groove are matched and connected by UV glue, usually 1-3 seconds are waited, and then the upper shell and the lower shell are matched and connected after the UV glue is completely fused with the piezoelectric ceramic sheet and the mounting groove, respectively). After the matching connection, the connection between the upper shell and the lower shell is carried out (the silica gel and the sound-absorbing cotton are assembled with the upper shell by another assembly process (manual or machine), and the embodiment only details the dispensing process of the UV glue).

[0045] In the preferred embodiment, the piezoelectric ceramic sheet is matched and connected with the mounting groove 23 by UV glue. The UV glue (specifically, ultraviolet hardening resin) includes the following components: methacrylic acid ester, 20%-45% by weight; specifically, 25%-40% by weight; cyanoacrylate glue, 10%-25% by weight; specifically, 15%-20%; polyamide glue, 5%-15% by weight; specifically, 7%-12% by weight; and vinyl resin, 5%-15% by weight; specifically, 7%-12% by weight.

[0046] Through comparison tests, it is found that the piezoelectric ceramic sheet installed in the sensor by UV glue improves the detection sensitivity of the ultrasonic sensor (compared with traditional glue), and to some extent, the detection accuracy is also improved. The specific comparison data are as follows:

[0047]

[0048] Table 1: UV resin glue test data table

[0049] Number Frequency khz ) capacitance nF ) Aftervibration (ms) Sensitivity (v) 1 59.20 1.641 1.46 1.82 2 58.80 1.662 1.59 2.02 3 59.00 1.781 1.57 1.90 4 59.00 1.829 1.22 1.64 5 57.20 1.752 1.36 1.86 6 59.00 1.822 1.34 1.84 7 58.80 1.669 1.33 1.86 8 59.00 1.690 1.43 1.76 9 59.00 1.808 1.20 2.00 10 59.00 1.748 1.24 1.58

[0050] Table 2: Traditional glue test data table

[0051] The specific parameters of the UV glue are as follows:

[0052] 4. Properties (when liquid)

[0053] Test item Unit Property Test method Note Main component - Methacrylic acid ester Appearance - Pale yellow transparent 3TS-201-01 Visual Viscosity Pa-s (P) 7(70) 3TS-210-02 BH type, lot No. 520 rpm Specific gravity - 1.06 3TS-213-02

[0054] Meanwhile, other factors that improve the sensitivity of the ultrasonic sensor by the UV resin glue used in the present application also include the hardness and stretchability of the glue, and the specific factors are as follows:

[0055] 5-1 Hardened material properties

[0056] Test item Unit Characteristic value Test method Note Hardness - D60 3TS-215-01 Elongation ％ 200 3TS-320-02 Young's modulus MPa (kg t / cm 2 )]]> 263(2680) 3TS-330-01 Shear strength MPa (kgf / cm 2 )]]> 32.0(325) 3TS-320-02 Glass transition point ℃ 104.4 3TS-501-04 Ton delta maximum Peak Water absorption ％ 43 3TS-233-03 Boiling 2H Film thickness hardening property mm 2.5 3TS-222-01 30 KJ / m 2 ]] Hardening shrinkage ％ 84 3TS-228-01 Thermal mass change rate ％ -1.1 3TS-501-03 80℃×24H

[0057] Hardening conditions: 4KW high-pressure mercury lamp (HMW-24411CM, manufactured by Tsukishima Kika Co., Ltd.): lamp height 15 cm.

[0058] Integrated light amount: 30 kJ / m 2 (3000 mJ / cm2)

[0059] Please refer to Figures 5-10 In the preferred embodiment, the bearing device 71 comprises a bearing tray and a second driving mechanism connected with each other, the second driving mechanism drives the bearing tray to rotate, and a plurality of mold assembly (the mold assembly comprises a first base and a mold cavity, the first base is fixedly connected with the bearing tray, the mold cavity is a plurality of and is sequentially arranged on the first base, and a positioning column is arranged in the mold cavity) are also arranged on the bearing tray in a spaced manner.

[0060] The glue dispensing device comprises a third driving mechanism and a glue dispensing mechanism 5 connected with each other, the glue dispensing mechanism 5 comprises a glue gun 57, and the third driving mechanism can drive the glue gun 57 to move towards the direction of the mold assembly.

[0061] The first adsorption device 4 comprises a first driving mechanism and a first adsorption part 63 connected with each other, and the first driving mechanism can drive the first adsorption part 63 to move towards the direction of the mold assembly.

[0062] The manufacturing method of the ultrasonic sensor according to any one of the above embodiments provided by the application has the following specific working principle:

[0063] When the bearing tray rotates, the mold assembly (the first base, the mold cavity and the positioning column) rotates, when the mold assembly rotates to the front of the work station of the glue dispensing device, the third driving mechanism drives the glue dispensing device to perform the glue dispensing work on the piezoelectric ceramic sheet of the mold assembly, after the glue dispensing device completes the glue dispensing work, the bearing tray rotates again, so that the mold assembly rotates to the front of the first adsorption device 4, at this time, the first driving mechanism drives the first adsorption part 63 to adsorb the shell (the ultrasonic sensor shell) and covers the shell on the ceramic sheet with glue, so as to realize the gluing work of the shell and the piezoelectric ceramic sheet. In the embodiment, by arranging a plurality of mold assemblies on the bearing tray, each processing procedure can immediately proceed to the next step after completing the current work (for example, when the first mold assembly stays in front of the glue dispensing device, the glue dispensing device dispenses glue on the ceramic sheet, after the glue dispensing is completed, the bearing tray rotates to enter the next procedure, at this time, the mold assembly behind is rotated to the front of the glue dispensing device, and the cycle is repeated), so that each procedure can realize automatic and orderly work in the assembly process, without manual participation in the whole process, which greatly improves the production efficiency and saves the labor cost.

[0064] Please refer to Figures 5-10In the preferred embodiment, the workbench 8 is further provided with a second suction device 6, a third suction device 7, a first conveying device 82, a second conveying device 61 and a third conveying device 72. The glue dispensing device, the first suction device 4, the second suction device 6 and the third suction device 7 are sequentially arranged around the carrier device 71. The first conveying device 82, the second conveying device 61 and the third conveying device 72 are respectively located on one side of the first suction device 4, the second suction device 6 and the third suction device 7. In this embodiment, the second suction device 6 is used to adsorb the assembled workpiece, the third suction device 7 is used to adsorb the piezoelectric ceramic sheet to the mold assembly, the first conveying device 82 is used to convey the shell, the second conveying device 61 is used to convey the assembled workpiece, and the third conveying device 72 is used to convey the piezoelectric ceramic sheet to be processed. The third conveying device 72 is provided with a receiving groove and an elastic element located in the receiving groove. The piezoelectric ceramic sheet is placed on the elastic element. The elastic element is used to push the piezoelectric ceramic sheet to the notch so that the third suction device 7 can adsorb it. (For the conveying of the piezoelectric ceramic sheet in this application, a conveying belt or other conveying methods can also be used for conveying. The specific conveying method is not limited as long as the piezoelectric ceramic sheet can be conveyed.)

[0065] In the preferred embodiment, the workbench 8 is further provided with a pressing device (not shown) which is arranged between the first suction device 4 and the second suction device 6. The pressing device is used to press the ultrasonic sensor shell and the piezoelectric ceramic sheet, thereby ensuring the firmness between the piezoelectric ceramic sheet and the shell. (The pressing device specifically includes a pressing part, a first driving mechanism, a first fixed seat 62 and a first connecting seat 64. The structure of the first driving mechanism, the first fixed seat 62 and the first connecting seat 64 is the same as that of the three suction devices in the following embodiments.)

[0066] Therefore, in this embodiment, the working order of the sensor automatic glue dispensing and patching device, or the working steps of assembly are as follows:

[0067] Step 1: After the third conveying device 72 conveys the piezoelectric ceramic sheet to the work station, the third suction device 7 adsorbs the piezoelectric ceramic sheet and places it on the mold assembly.

[0068] Step 2: The glue dispensing device dispenses glue on the piezoelectric ceramic sheet.

[0069] Step 3: After the first conveying device 82 conveys the shell to the work station, the first suction device 4 adsorbs the shell and moves it to the mold assembly, and covers it on the piezoelectric ceramic sheet coated with glue (i.e. the piezoelectric ceramic sheet and the mounting groove are matched and connected), so that the shell and the piezoelectric ceramic sheet are bonded.

[0070] Step 4: The pressing part of the pressing device presses the workpiece (i.e. the shell and the piezoelectric ceramic sheet of the ultrasonic sensor), so that the bonding between the shell and the piezoelectric ceramic sheet is more firm.

[0071] Step 5: The second adsorption device 6 adsorbs the assembled workpiece to the second conveying device 61, and the second conveying device 61 transports the workpiece, and then matches and connects between the upper shell and the lower shell (the assembly process between the upper shell and the lower shell can be assembled by manual assembly, and the assembly mode is not limited), forming the assembled ultrasonic sensor.

[0072] Through the above steps, the whole assembly process of the sensor can be completed in one station area, and the whole process adopts a fully automatic operation mode. Compared with the traditional assembly line type work layout or manual operation, the device of the present application occupies less space, further improves the production efficiency of the enterprise, and also improves the quality of the product.

[0073] In the preferred embodiment, the first adsorption device 4, the second adsorption device 6 and the third adsorption device 7 each include a first adsorption part 63, a first driving mechanism, a first fixed seat 62 and a first connecting seat 64, the first fixed seat 62 is connected with the workbench 8, the first driving mechanism includes a transverse driving mechanism 65 and a longitudinal driving mechanism 53, the transverse driving mechanism 65 is connected with the first fixed seat 62 through the first connecting seat 64, the first connecting seat 64 is connected with the first adsorption part 63, the transverse driving mechanism 65 controls the first connecting seat 64 to move in the direction of the supporting tray on the first fixed seat 62, the longitudinal driving mechanism 53 is located on the first connecting seat 64 and connected with the first adsorption part 63, and the longitudinal driving mechanism 53 can control the first adsorption part 63 to move in the direction of the workbench 8. In this embodiment, the overall structure and working process of the first adsorption device 4, the second adsorption device 6 and the third adsorption device 7 are similar; refer to Figure 5 , moving in the direction of the supporting tray means reciprocating transversely from left to right; moving in the direction of the workbench 8 means reciprocating longitudinally from top to bottom, and the movement direction referred to in other embodiments is the same as that referred to in this embodiment, and will not be repeated hereinafter.

[0074] The sensor automatic dispensing and patching device provided by the present application provides the following two embodiments for the dispensing device:

[0075] Refer to Figures 5-10In the embodiment, the dispensing device further comprises a second fixing base 52 and a second connecting base, the third driving mechanism comprises a transverse driving mechanism 65 and a longitudinal driving mechanism 53, the second connecting base is connected with the workbench 8 through the second fixing base 52, the glue gun 57 is further connected with the second connecting base, the longitudinal driving mechanism 53 is located on the second connecting base, the transverse driving mechanism 65 is connected with the second connecting base and controls the second connecting base to move on the second fixing base 52 towards the direction of the supporting tray, specifically, towards the direction of the mold assembly, the longitudinal driving mechanism 53 can control the glue gun 57 to move towards the direction of the workbench 8 to dispense glue on the piezoelectric ceramic sheet, the second connecting base comprises a first supporting plate 54, a second supporting plate 541 and a driving rod, one end of the first supporting plate 54 is connected with the glue gun 57, the other end is connected with the second supporting plate 541 through the driving rod, the longitudinal driving mechanism 53 is located on the second supporting plate 541 and drives the first supporting plate 54 to move through the driving rod, and the second supporting plate 541 is further connected with the second fixing base 52. The second supporting plate 541 also limits the movement of the first supporting plate 54.

[0076] Reference Figures 5-10 In the embodiment, the dispensing device further comprises a second fixing base 52 and a second connecting base, the third driving mechanism comprises a transverse driving mechanism 65 and a longitudinal driving mechanism 53, the second connecting base is connected with the workbench 8 through the second fixing base 52, the glue gun 57 is further connected with the second connecting base, the longitudinal driving mechanism 53 is located on the second connecting base, the transverse driving mechanism 65 is connected with the second connecting base and controls the second connecting base to move on the second fixing base 52 towards the direction of the supporting tray, specifically, towards the direction of the mold assembly, the longitudinal driving mechanism 53 can control the glue gun 57 to move towards the direction of the workbench 8 to dispense glue on the piezoelectric ceramic sheet, the second connecting base comprises a first supporting plate 54, a second supporting plate 541 and a driving rod, the first supporting plate 54 is connected with the second supporting plate 541 through the driving rod, the first supporting plate 54 is further provided with a sliding assembly 55, the sliding assembly 55 can realize sliding in the form of a sliding rod or the like, the sliding assembly 55 can realize accurate adjustment of the dispensing part of the glue gun 57, and the dispensing accuracy is higher. The glue gun 57 is connected with the first supporting plate 54 through the sliding assembly 55, the longitudinal driving mechanism 53 is located on the second supporting plate 541 and drives the first supporting plate 54 to move through the driving rod, and the second supporting plate 541 is further connected with the second fixing base 52.

[0077] Reference Figures 5-10 In the preferred embodiment, the glue gun 57 comprises a first connecting part 51, and the first supporting plate 54 comprises a second connecting part matched with the first connecting part 51.

[0078] Reference Figures 5-10In a further preferred embodiment, the glue gun 57 can be replaced by a glue brush, that is, the glue dispensing device comprises a third driving mechanism and a glue dispensing mechanism 5 connected with each other, the glue dispensing mechanism 5 comprises a glue brush and a brush glue seat (not shown) connected with each other, the brush glue seat is provided with a notch matched with the mold assembly (the notch has a diameter gradually decreasing from top to bottom, or the diameter of the top of the notch is larger than that of the bottom of the notch, mainly to control the amount of glue on each piezoelectric ceramic piece so as to affect the sensitivity of the sensor), and the third driving mechanism can drive the glue brush to move on the brush glue seat, so that the glue brush performs the glue coating work on the ceramic piece through the notch.

[0079] Reference Figures 5-10 In a preferred embodiment, the second connecting part comprises an adjusting piece 56 and two baffles 58 arranged oppositely, the two baffles 58 are arranged on the first support plate 54, and the two baffles 58 are each provided with a connecting groove, the adjusting piece 56 comprises an adjusting block and a connecting rod connected with each other, one end of the first connecting part 51 is located between the two baffles 58, the connecting rod is connected with the connecting groove and the first connecting part 51 respectively, specifically, the connecting rod penetrates into the connecting groove on one of the baffles 58, then penetrates through the first connecting part 51, and then penetrates out of the connecting groove on the other baffle 58, so as to realize the movable connection between the first connecting part 51 and the second connecting part, and the glue dispensing angle of the glue gun 57 can be adjusted relatively, but it is not limited to this connection mode, and other connection modes can also be used as long as the movable connection between the first connecting part 51 and the second connecting part can be realized, so that the adjusting block can control the movement of the connecting rod in the connecting groove, the adjusting block mainly adjusts the inclination angle of the glue gun 57, so as to realize the precision of glue dispensing, and thus ensure the sensitivity and detection progress of the ultrasonic sensor composed.

[0080] Reference Figures 5-10 In a preferred embodiment, the first conveying device 82 comprises a feeding disc 81 and a first conveying belt connected with each other, the first conveying belt is provided with a clamping part on one end close to the first adsorption device 4, and the feeding disc 81 is located on the other end of the first conveying belt, the clamping part comprises a first clamping block 44, a second clamping block 43 and a first air cylinder 41 arranged oppositely, the first clamping block 44 and the second clamping block 43 are connected with the first air cylinder 41, the first air cylinder 41 can drive the first clamping block 44 and the second clamping block 43 to move close to or away from each other, the first conveying belt, the clamping part and the mold assembly are connected in sequence to form a first axis (refer to Figure 6The first driving mechanism can drive the first suction part 63 to move along the first axis direction (including the X-axis direction and the Y-axis direction, or the transverse direction and the longitudinal direction) from the perspective of the top view. The feeding disc 81 is provided with a vibration motor and a conveying groove. The conveying groove is in a spiral ascending structure. The shell is located on the conveying groove. The vibration motor vibrates and conveys the shell to the first conveying belt through the conveying groove, thereby ensuring the stability of the shell during the conveying process.

[0081] In the preferred embodiment, the clamping part includes a base and a sliding part 45 arranged on the base. The first clamping block 44 and the second clamping block 43 are both in sliding connection with the sliding part 45. The first cylinder 41 controls the relative movement of the first clamping block 44 and the second clamping block 43 on the sliding part 45. The clamping surface 42 of the first clamping block 44 is in a planar structure. The clamping surface 42 of the second clamping block 43 is in a sawtooth surface structure (the sawtooth surface is composed of a plurality of matching grooves in a "V" shape. The connecting surface of the adjacent two "V" shaped matching grooves is in a planar structure, mainly to improve the clamping effect of the clamping block). In this embodiment, the relative movement means that the first cylinder 41 can control the first clamping block 44 and the second clamping block 43 to move closer to or away from each other. When the first clamping block 44 and the second clamping block 43 move closer to each other, the shell is clamped. At this time, the clamping block plays a role in positioning the shell. Further, when the first clamping block 44 and the second clamping block 43 move closer to each other, one side of the shell is in contact with the clamping surface 42 (the plane) of the first clamping block 44, and the other side is in contact with the sawtooth surface of the second clamping block 43 (i.e. the other side is located in the "V" shaped matching groove), thereby ensuring that a plurality of shells are located on the same horizontal plane. The interval between the adjacent two "V" shaped matching grooves is to ensure that when each shell is placed on the piezoelectric ceramic sheet, the piezoelectric ceramic sheet is always bonded with the center point position of the shell.

[0082] In the preferred embodiment, the first conveying device 82 includes a first conveying belt, and the second conveying device 61 includes a second conveying belt. The first conveying belt includes a second base, a driving motor and a driving wheel. The driving motor and the driving wheel are connected and both located in the second base. The second base is provided with a transmission groove above the driving wheel. In this embodiment, the first conveying belt and the second conveying belt are of the same structure. The driving wheel is located in the second base. The driving wheel is two, and is located at both ends of the second base. It can also be a plurality of driving wheels. The driving wheels can be in synchronous wheel, belt wheel or gear transmission mode. The first conveying belt is connected with the driving wheel. The driving motor drives the first conveying belt to move through the driving wheel. The shell is located on the transmission groove. The first conveying belt also drives the shell to transport on the transmission groove at the same time.

[0083] The application has the advantages that the ultrasonic sensor and the manufacturing method thereof are provided, the upper shell 1 and the lower shell 2 are matched and connected, the efficiency is higher than that of the traditional combination mode, the installation is more convenient, and the production efficiency is improved.

[0084] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. An ultrasonic sensor, characterized in that, The device includes an upper housing and a lower housing. The upper housing is provided with a first connecting component, and the lower housing is provided with a second connecting component that is matched and connected to the first connecting component. The upper housing and the lower housing are matched and connected to form a receiving cavity. The receiving cavity contains silicone, sound-absorbing cotton, and a piezoelectric ceramic sheet arranged sequentially from top to bottom. One end of the silicone is also connected to the upper housing. The lower housing is provided with a mounting groove, and the piezoelectric ceramic sheet is located in the mounting groove. The top of the upper housing is provided with a connection port, and the lower housing is also provided with a rivet. Both the piezoelectric ceramic sheet and the rivet are connected to the connection port. The first connecting component includes a fixing part and a first connecting part that are connected to each other. The fixing part is connected to the upper housing. The second connecting component includes a fixing groove. The fixing groove is provided with a second connecting part that matches and connects with the first connecting part. When the first connecting component and the second connecting component are matched and connected, the first connecting part and the second connecting part are matched and connected. There are two of each of the first and second connecting components. The two first connecting components or the two second connecting components are arranged diagonally.

2. The ultrasonic sensor as described in claim 1, characterized in that, The thickness of the bottom of the lower housing is 0.6-0.7 mm, and the height of the mounting groove is 0.05-0.2 mm.

3. The ultrasonic sensor as described in claim 1, characterized in that, Both ends of the upper housing are provided with bending portions. Each bending portion includes a first fixing block and a protrusion connected to each other. The other end of the protrusion protrudes outward relative to the first fixing block. The first fixing block is also connected to the lower housing. The protrusion is located in the accommodating cavity and divides the accommodating cavity into a first connecting cavity and a second connecting cavity connected to each other. The first connecting cavity is connected to the upper housing, and the second connecting cavity is connected to the lower housing.

4. The ultrasonic sensor as described in claim 3, characterized in that, The lower housing is provided with a stepped groove, which is matched and connected to the first fixing block. The rivet is provided on the stepped groove. The first fixing block is provided with a connecting hole that matches and connects to the rivet. One end of the connecting hole is also connected to the connecting port.

5. The ultrasonic sensor as described in claim 4, characterized in that, The first connecting part includes a first connecting block, a second connecting block, and a connecting post. The two ends of the connecting post are respectively connected to the first connecting block and the second connecting block, and a connecting groove is formed between the first connecting block and the second connecting block. The second connecting part includes two opposing pushing components. The two pushing components can move relative to each other in the fixed groove. When the first connecting part and the second connecting part are matched and connected, one end of each of the two pushing components is located in the connecting groove.

6. The ultrasonic sensor as described in claim 5, characterized in that, The second connecting block has a conical structure. The pushing assembly includes an elastic element and a pushing block that are connected to each other. One end of the elastic element is connected to the inner wall of the fixed groove. The end of the pushing block away from the elastic element is provided with an inclined section. When the two pushing blocks are matched and connected, the two inclined sections are connected to form a conical groove.

7. The ultrasonic sensor as described in claim 5, characterized in that, The second connecting component further includes two second fixing blocks, both of which are disposed within the accommodating cavity. The two second fixing blocks are arranged opposite each other with a gap between them, and the first connecting block is located in the gap.

8. A method for manufacturing an ultrasonic sensor as described in any one of claims 1-7, characterized in that, The assembly is performed using an automatic dispensing and bonding device with an ultrasonic sensor. This device includes a worktable, a support device on the worktable, a dispensing device, and a first adsorption device. The dispensing device and the first adsorption device are arranged sequentially around the support device. The support device has a mold cavity and a positioning post located within the mold cavity. The assembly specifically includes the following steps: S1: The piezoelectric ceramic sheet is conveyed to the positioning post in the mold cavity and the supporting device is controlled to rotate to the station where the dispensing device is located; the dispensing device is controlled to move towards the positioning post and dispense glue onto the piezoelectric ceramic sheet; after the dispensing is completed, the supporting device is controlled to rotate to the station where the first adsorption device is located. S2: The lower housing is adsorbed by the first adsorption device, and the lower housing is controlled to move towards the positioning post to match and connect the piezoelectric ceramic sheet and the mounting groove in the lower housing. After the matching and connection, the upper housing and the lower housing are connected.

9. The method for manufacturing an ultrasonic sensor as described in claim 8, characterized in that, The piezoelectric ceramic sheet is connected to the mounting groove using UV adhesive, which includes the following components: methacrylate, 20%-45% by weight; cyanoacrylate adhesive, 10%-25% by weight; polyamide adhesive, 5%-15% by weight; and vinyl resin, 5%-15% by weight.

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