Tester for detecting performance of water meter light guide assembly and performance of circuit board

Abstract

A tester for detecting the performance of a water meter light guide assembly and the performance of a circuit board is characterized in that the left side and the right side of a base of the tester are respectively provided with an elastic support plate, a supporting plate is arranged between the two elastic support plates, a standard part of a digital counter is installed in the center of the supporting plate, and a digital counter is installed on the side of the standard part. A driving motor capable of shifting character wheels in the counter to move is arranged, a circuit board capable of emitting and receiving light is arranged below a standard part, a plurality of metal probes connected with a control circuit are arranged below the circuit board, a light guide assembly of a water meter is inserted into a gap of the counter from the lower portion of the standard part, a supporting plate is pressed downwards, and the counter is arranged on the standard part. The circuit board is contacted with the metal probe, and the light guide assembly is in photoelectric connection with the circuit board. The performance of the light guide assembly and the performance of a circuit board electrically connected with the light guide assembly are tested respectively. The tester is dual-purpose, can improve the qualified rate of semi-finished products in finished products to be packaged, and greatly reduces the re-inspection cost when subsequent products have problems.

Description

Technical Field

[0001] The invention relates to a tester for detecting a circuit board or a light guide component in the process of manufacturing a water meter. Background Art

[0002] A light guide assembly is used in the water meter wheel assembly, and the function of the light guide assembly is to convert the movement information (i.e., metering information) of each wheel in the wheel assembly into an electrical signal through the transmission of light and output it. The light guide assembly is composed of a light guide base and two types of light guides, namely, a light emitting light guide and a light receiving light guide. The light emitting light guide guide guides the light emitted by the light emitting diode on the circuit board and irradiates it on the spoke surface of the wheel. A number of light-transmitting holes are designed on the spoke surface of the wheel. All light passing through the light-transmitting holes is guided by the light receiving light guide to the light receiving diode set on the circuit board, thereby obtaining the movement information of each wheel (for the specific counting working principle, please refer to the invention patent application submitted by Shenzhen Jiexian Digital Technology Co., Ltd. to the State Intellectual Property Office on May 14, 2019, the invention name is "Signal transmission structure and direct reading water meter for collecting water metering values ​​in a sealed cavity", and the application number is CN201920683123.8).

[0003] In the prior art, the quality and performance inspection of the assembled optical waveguide components or circuit boards is performed after the optical waveguide components, circuit boards and base tables are assembled into finished products, and then a final inspection is performed. If quality or performance problems are found in the finished products in this way, the finished products need to be disassembled and parts replaced, resulting in low production efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a tester for detecting the performance of a water meter optical guide component and a circuit board, which saves time and effort and has high detection efficiency.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The tester for detecting the performance of the light-conducting component and the circuit board of a water meter of the present invention comprises a base and a control circuit installed in a box body of the base, and is characterized in that: an elastic bracket plate is respectively provided on the left and right sides of the base, a support plate is placed between the two elastic bracket plates, a standard part of a digital counter is installed in the center of the support plate, a driving motor for moving each character wheel in the counter is provided beside the standard part, a circuit board capable of emitting and receiving light is provided below the standard part, a plurality of metal probes are provided below the circuit board, the metal probes are connected to the control circuit, the light-conducting component of the water meter is inserted upward from the bottom of the standard part into the gap of the counter, the support plate is pressed downward, the circuit board contacts the metal probes, and the light-conducting component is photoelectrically connected to the circuit board.

[0007] The elastic support plate is provided with two positioning holes, each of which is penetrated by a positioning guide column installed on the base, and a support plate reset spring is sleeved on the positioning guide column between the elastic support plate and the base.

[0008] An inwardly protruding platform is provided in the middle of the elastic bracket plate, and an upwardly extending fixing column is provided on the platform. Correspondingly, a fixing hole is provided at each end of the supporting plate.

[0009] A back substrate is vertically arranged on the rear side of the base, and a limiting guide column installed on the base is provided on both sides of the front of the back substrate. A pressure plate that can move up and down is provided on the limiting guide column, and a pressure plate return spring is provided on the limiting guide column between the pressure plate and the base. Above the pressure plate, a pressure rod connecting device is provided for moving the pressure plate and the supporting plate downward by pressing.

[0010] The pressure rod connecting device includes a handle, a hinged connecting piece, a push rod and a connecting back plate. The connecting back plate is fixed in front of the back base plate. A hinge position is provided at the upper part of the connecting back plate. A rod shaft sleeve is provided at the lower part of the connecting back plate for the push rod to pass through. By pulling the handle forward from back to front, the push rod moves downward and presses the pressure plate.

[0011] Among the character wheels in the counter, a plurality of low-position character wheels except the two highest-position character wheels are fixedly connected together, and the original four-eight tooth wheels between the plurality of character wheels are removed.

[0012] The tester of the present invention can test the performance of the light guide assembly and the performance of the circuit board electrically connected to the light guide assembly respectively on the basis of using the standard counter as a template. When the performance of the light guide assembly needs to be tested, the counter and the circuit board are standard parts, and when the performance of the circuit board needs to be tested, the counter and the light guide assembly are standard parts.

[0013] The tester has two functions in one machine. It can test optical components or circuit boards separately according to the needs. It can improve the pass rate of semi-finished products to be assembled and greatly reduce the re-inspection cost of subsequent products with problems.

[0014] Preferably, the counter can realize rapid simulation of the high-digit numerical situation of the counter by bonding the two character wheels except the highest digit together and removing the four or eight tooth wheels between the bonded character wheels. Compared with ordinary stopwatch detection, a large amount of time required for the stopwatch to reach the high-digit numerical situation is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the tester of the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the explosion in the middle part.

[0017] Figure 3 yes Figure 1 Schematic diagram of the mid-back substrate, pressure rod connection device and pressure plate.

[0018] Figure 4 yes Figure 2 Schematic diagram of the center tray.

[0019] Figure 5 yes Figure 2 Schematic diagram of the elastic support plate.

[0020] Figure 6 yes Figure 2 Top view of the counter.

[0021] Figure 7 yes Figure 2 Bottom view of the counter.

[0022] Figure 8 yes Figure 2 Schematic diagram of the light guide assembly.

[0023] Reference numerals

[0024] Pressure rod connecting device 1, handle 11, hinged connecting part 12, left connecting plate 121, right connecting plate 122, push rod 13, connecting back plate 14, hinge position 15, rod shaft sleeve 16, back base plate 21, pressure plate 22, hollow area 23, limit guide column 24, pressure plate reset spring 25, support plate 3, central plate 31, long plate 32, fixing hole 33, elastic bracket plate 4, platform 41, fixing column 42, positioning guide column 43, bracket plate reset spring 44, circuit board 5 base 6, metal probe 61, liquid crystal display 62, power switch 63, button 64, counter 7, optical guide component installation position 71, four-eight gear 72, drive motor 8, optical guide component 9. DETAILED DESCRIPTION

[0025] like Figure 1-Figure 8 As shown, the tester for detecting the performance of the water meter optical guide assembly and the circuit board performance of the present invention (hereinafter referred to as the tester) includes, from top to bottom, a pressure rod connecting device 1, a pressure plate 22, a support plate 3, a base 6 and a control circuit arranged in the box body of the base 6.

[0026] A mounting position for mounting a standard counter 7 is provided in the center of the support plate 3, and a drive motor 8 is provided next to the counter 7. The drive motor 8 is controlled by a control circuit and drives the counter 7 to rotate (hereinafter, the numbers displayed on the counter 7 are referred to as direct-read count values).

[0027] A light guide assembly installation position 71 is provided on the lower surface of the counter 7 to insert the light guide assembly 9 into the counter 7. A plurality of light emitting light guides and light receiving light guides in the light guide assembly 9 are arranged adjacent to each other at intervals. Each light emitting light guide and light receiving light guide are respectively inserted into the corresponding counter 7 character wheel gap (the character wheel gap refers to the space between two adjacent character wheels) (see Figure 7 and Figure 8 ).

[0028] A circuit board 5 for emitting and receiving infrared light is provided below the counter 7, a metal probe 61 is provided at the center of the top surface of the base 6, and light emitting diodes and light receiving diodes corresponding to the number of light emitting light guides and light receiving light guides in the light guide component 9 are provided on the circuit board 5. When the support plate 3 carrying the light guide component 9 is pressed down by the pressing plate 22, the light emitting light guide and the light receiving light guide in the light guide component 9 are respectively in contact with the corresponding light emitting diodes and light receiving diodes on the circuit board 5. At the same time, the metal probe 61 is in contact with the hole position of the corresponding pinhole on the circuit board 5, so that the light guide component 9 and the circuit board 5 are photoelectrically connected. When the character wheel rotates, the light guide component 9 can send the coded digital information corresponding to the direct reading count value when the character wheel rotates to the circuit board 5, and the circuit board 5 then sends the coded digital information to the control circuit.

[0029] A liquid crystal display screen 62 is provided at a corner of the base 6 , and the control circuit converts the coded digital information into a number that can be displayed on the liquid crystal display screen 62 (hereinafter referred to as the electronic count value).

[0030] When it is necessary to quickly detect the counting status of the high-order character wheel of the counter 7, the present invention can preferably adopt an analog detection method, that is, the low-order character wheels other than the two highest-order character wheels in the counter 7 are bonded together, and the four-eight tooth wheel 72 between the bonded character wheels is removed. When the counter 7 is subsequently dialed, the bonded character wheels are simulated as the ones digit, and the highest two digits are simulated as the tens digit and the hundreds digit (see Figure 6 ).

[0031] When the tester is used to detect the performance of the optical guide assembly 9, the counter 7 and the circuit board 5 are standard parts:

[0032] 1) After the pressing plate 22 is pressed down, the control circuit is started, but the driving motor 8 is not started. At this time, if the electronic count value is inconsistent with the direct reading count value, it means that there is a problem with the optical guide component 9;

[0033] 2) After the pressure plate 22 is pressed down, the control circuit is started, but the drive motor 8 is not started. At this time, if the electronic count value is consistent with the direct-read count value, the drive motor 8 is started. After a period of time, if the electronic count value is consistent with the direct-read count value, it means that the optical guide component 9 is qualified. Otherwise, the optical guide component 9 has problems.

[0034] When the tester is used to detect the performance of the circuit board 5, the counter 7 and the light guide assembly 9 are standard parts:

[0035] 1) After the pressing plate 22 is pressed down, the control circuit is started, but the driving motor 8 is not started. At this time, if the electronic count value is inconsistent with the direct reading count value or no reading is displayed, it means that there is a problem with the circuit board 5;

[0036] 2) After the pressure plate 22 is pressed down, the control circuit is started, but the drive motor 8 is not started. At this time, if the electronic count value is consistent with the direct-reading count value, the drive motor 8 is started for a period of time. If the electronic count value is consistent with the direct-reading count value, it means that the circuit board 5 is a qualified product. Otherwise, the circuit board 5 has a problem.

[0037] The specific structure of the present invention is described in detail below.

[0038] 1. Pressure rod connection device 1

[0039] like Figure 1 and Figure 3 As shown, it includes a handle 11, an articulated connector 12, a push rod 13 and a connecting back plate 14, the connecting back plate 14 is vertically fixed on the back substrate 21 of the fixture, and the connecting back plate 14 is arranged at the upper end of the front surface of the back substrate 21 (with Figure 1 Taking the direction as an example, facing the observer is the front, pointing inside the figure is the back, up is the top, down is the bottom, pointing to the lower left is the left, pointing to the upper right is the right, and pointing to the center is the inside), a hinge position 15 is provided on the upper part of the connecting back plate 14, and the hinge position 15 protrudes forward and is perpendicular to the connecting back plate 14. An ear plate is provided on each side of the middle part of the connecting back plate 14, and the ear plate fixes the connecting back plate 14 to the back substrate 21 by bolts; a rod shaft sleeve 16 is provided at the lower part of the connecting back plate 14, through which the push rod 13 can be inserted, and the axis of the rod shaft sleeve 16 is parallel to the plane of the connecting back plate 14.

[0040] The hinged connecting member 12 includes a left connecting plate 121 and a right connecting plate 122 of the same structure and shape; the handle 11 is "L"-shaped, and each of the two ends of the horizontal part of the "L"-shape is provided with a through hole, which are an upper through hole and a lower through hole respectively, and the vertical part of the "L"-shape is suspended; the upper ends of the left connecting plate 121 and the right connecting plate 122 are hinged on the upper through hole through a hinge axis, and the lower through hole is hinged on the hinge position 15 through a hinge axis; the lower ends of the left connecting plate 121 and the right connecting plate 122 are hinged to the upper end of the push rod 13, and the lower end of the push rod 13 passes through the rod sleeve 16 and contacts the upper surface of the pressure plate 22, and the length of the horizontal part of the "L"-shape is less than the length of the left connecting plate 121.

[0041] The above structure allows the operator to flip the vertical part of the handle 11 from back to front, and then easily apply downward pressure to the pressing plate 22 through the push rod 13.

[0042] 2. Press plate 22

[0043] like Figure 3 As shown, the pressing plate 22 is a flat plate, and a hollow area 23 for observing the direct reading count value is provided in the middle area of ​​the front side of the plate. The two side edges of the hollow area 23 on the pressing plate 22 are placed on the supporting plate 3. When the pressing plate 22 moves downward, the two side edges can exert pressure on the supporting plate 3; a limiting guide column 24 installed on the base 6 is provided on each of the two rear sides of the pressing plate 22, and the pressing plate 22 is installed on the two limiting guide columns 24 and can move up and down along the limiting guide columns 24, and a pressing plate reset spring 25 is provided on the limiting guide column 24 between the pressing plate 22 and the base 6.

[0044] 3. Pallet 3

[0045] like Figure 4 and Figure 5 As shown, the support plate 3 is placed under the pressure plate 22, and includes a circular central plate 31 and long plates 32 connected to both sides of the central plate 31. A mounting position for mounting the counter 7 is provided in the middle of the central plate 31, and a fixing hole 33 penetrating the ear plate is provided on the ear plate. The support plate 3 is bridged between two elastic support plates 4.

[0046] The two elastic support plates 4 are respectively arranged on the left and right sides of the base 6, and an inwardly protruding platform 41 is provided in the middle of the elastic support plate 4, and an upwardly extending fixing column 42 is provided on the platform 41, and the fixing hole 33 of the ear plate is movably sleeved on the fixing column 42; the elastic support plate 4 is provided with two positioning holes, and a positioning guide column 43 installed on the base 6 is inserted into each positioning hole, and a frame plate reset spring 44 is sleeved on the positioning guide column 43 between the elastic support plate 4 and the base 6.

[0047] 4. Base 6

[0048] like Figure 1 and Figure 2 As shown, the base 6 is a box with an inner cavity and a rectangular shape. The control circuit is arranged in the box. On the top surface of the base 6, there is a power switch 63 for connecting the control circuit and a button 64 for starting the drive motor 8. The liquid crystal display screen 62 is placed in the front right corner; in the center of the top surface of the base 6, there is a detection position for installing the circuit board 5, and the circuit board 5 is electrically connected to the control circuit through a contact pin.

[0049] 5. Description of working principle

[0050] 1) Insert the light guide assembly 9 into the counter 7 and install the circuit board 5 on the detection position;

[0051] 2) Hold the handle 11 and move it from front to back. At this time, the push rod 13 abuts against the pressing plate 22 and applies downward pressure, so that the pressing plate 22 moves downward;

[0052] 3) connecting the optical guide assembly 9 to the circuit board 5 optically;

[0053] 4) Testing the circuit board 5 or the light guide assembly 9 according to the aforementioned testing method;

[0054] 5) After the detection is completed, the handle 11 is released, the pressure plate reset spring 25 and the frame plate reset spring 44 release the compressed force, so that the pressure rod connecting device 1 returns to the initial state, and the detected optical waveguide component 9 or circuit board 5 can be taken out.

Claims

1. A tester for detecting the performance of a water meter optical guide assembly and a circuit board, comprising a base (6) and a control circuit installed in a box body of the base (6), characterized in that: An elastic support plate (4) is provided on each of the left and right sides of the base (6), a support plate (3) is placed between the two elastic support plates (4), a standard part of a digital counter (7) is installed in the center of the support plate (3), a driving motor (8) for moving each character wheel in the counter (7) is provided beside the standard part, a circuit board (5) capable of emitting and receiving light is provided below the standard part, a plurality of metal probes (61) are provided below the circuit board (5), the metal probes (61) are connected to the control circuit, a light guide component (9) of the water meter is inserted upward from the bottom of the standard part into the gap of the counter (7), the support plate (3) is pressed downward, the circuit board (5) contacts the metal probes (61), and the light guide component (9) is photoelectrically connected to the circuit board (5).

2. The tester for detecting the performance of the light guide assembly and the circuit board of a water meter according to claim 1, characterized in that: The elastic support plate (4) is provided with two positioning holes, each of which has a positioning guide column (43) installed on the base (6) inserted into it, and a support plate return spring (44) is sleeved on the positioning guide column (43) between the elastic support plate (4) and the base (6).

3. The tester for detecting the performance of the light guide assembly and the circuit board of a water meter according to claim 2, characterized in that: An inwardly protruding platform (41) is provided in the middle of the elastic support plate (4), and an upwardly extending fixing column (42) is provided on the platform (41). Correspondingly, a fixing hole (33) is provided at each end of the support plate (3).

4. The tester for detecting the performance of the light guide assembly and the circuit board of a water meter according to claim 1, characterized in that: A back substrate (21) is vertically arranged on the rear side of the base (6), and a limiting guide column (24) installed on the base (6) is respectively arranged on the front sides of the back substrate (21), and a pressure plate (22) that can move up and down is arranged on the limiting guide column (24), and a pressure plate return spring (25) is arranged on the limiting guide column (24) between the pressure plate (22) and the base (6), and a pressure rod connecting device (1) is arranged above the pressure plate (22) for moving the pressure plate (22) and the supporting plate (3) downward by pressing.

5. The tester for detecting the performance of the light guide assembly and the circuit board of a water meter according to claim 4, characterized in that: The pressure rod connecting device (1) comprises a handle (11), a hinged connecting member (12), a push rod (13) and a connecting back plate (14); the connecting back plate (14) is fixed in front of the back base plate (21); a hinge position (15) is provided on the upper part of the connecting back plate (14); a rod shaft sleeve (16) is provided on the lower part of the connecting back plate (14) for the push rod (13) to pass through; by pulling the handle (11) from back to front, the push rod (13) moves downward and presses the pressure plate (22).

6. The tester for detecting the performance of the light guide assembly and the circuit board of a water meter according to claim 1, characterized in that: Among the character wheels in the counter (7), a plurality of lower-position character wheels except the two highest-position character wheels are fixedly connected together, and the original four-eight tooth wheels (72) between the plurality of character wheels are removed.

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