A measuring instrument of a stacked quick assembly structure and an assembly method thereof

Abstract

The present application relates to the field of electrical technology, a kind of measuring instrument of stacked quick assembly structure and its assembly method, including instrument shell, instrument shell is sequentially arranged with bottom circuit board, middle circuit board, support sleeve, top layer circuit board from back to front in;Instrument shell is provided with bottom circuit board positioning rib, bottom circuit board horizontal direction limiting rib, bottom circuit board vertical direction limiting rib, bottom circuit board support rib, middle circuit board limiting rib, support sleeve limiting boss, top layer circuit board limiting rib and buckle slot;Positioning hole is set on bottom circuit board;Horizontal direction limiting plane is set on middle circuit board;Top layer circuit board is provided with top layer circuit board horizontal direction limiting plane.The structure of the present application is optimized, the alignment introduction when sequentially layering from opening end, several circuit board support ribs and limiting ribs are arranged in shell interior, so that corresponding circuit board is smoothly installed to target position, and assembly operation is simplified.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and in particular to a measuring instrument with a stacked, rapid assembly structure and its assembly method. Background Technology

[0002] Measuring instruments typically contain one or more circuit boards, and electrical connections between these circuit boards are achieved through connector mating. Traditional structures use internal clips or screws to assemble and secure these circuit boards. These traditional fixing structures occupy a significant amount of internal space, hindering further miniaturization. Furthermore, some of these traditional methods require multiple fasteners; others suffer from interference from the deformation forces of the plastic clips during assembly, making precise alignment of the connectors between circuit boards impossible. This results in unsatisfactory production efficiency and product quality.

[0003] Modern factories that mass-produce instrument products urgently need assembly structures that are efficient, simple, and feasible to reduce the workload of assembly operators and increase output. Furthermore, they can enable automated assembly operations by robotic arms, reducing the number of personnel in the production workshop and even achieving unmanned operation. Summary of the Invention

[0004] This invention addresses the problems and shortcomings of existing technologies by providing a stacked, rapid assembly structure for measuring instruments and its assembly method.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] The present invention provides a measuring instrument with a stacked quick assembly structure, including a front cover, a housing, a bottom circuit board, a middle circuit board and a top circuit board, characterized in that the bottom circuit board, the middle circuit board, the support sleeve and the top circuit board are arranged sequentially from back to front inside the housing.

[0007] The instrument housing is provided with bottom circuit board positioning ribs, bottom circuit board horizontal limiting ribs, bottom circuit board vertical limiting ribs, bottom circuit board support ribs, middle circuit board limiting ribs, support sleeve limiting bosses, top circuit board limiting ribs, and buckle grooves.

[0008] The bottom circuit board has positioning holes that match the positioning ribs of the bottom circuit board. The bottom circuit board has a horizontal limiting plane for sliding along the horizontal limiting ribs of the bottom circuit board. The bottom circuit board also has a vertical limiting plane for sliding along the vertical limiting ribs of the bottom circuit board. The rear side of the bottom circuit board abuts against the support ribs of the bottom circuit board.

[0009] The intermediate circuit board is provided with a horizontal limiting plane for sliding along the limiting rib of the intermediate circuit board, and the rear side of the intermediate circuit board abuts against the limiting rib of the intermediate circuit board.

[0010] The intermediate circuit board has limiting grooves on both the left and right sides.

[0011] The support sleeve includes a frame structure. The outer side of the frame structure is provided with a horizontal limiting plane for sliding along the limiting rib of the intermediate circuit board. The left and right sides of the frame structure are provided with vertically arranged limiting support ribs. Between the vertically arranged limiting support ribs on the same side of the frame structure, there is a supporting sleeve limiting groove for sliding along the limiting protrusion of the support sleeve. The rear side of the frame structure abuts against the intermediate circuit board.

[0012] The top circuit board has a top circuit board limiting groove that slides along the limiting protrusion of the support sleeve. The top circuit board has a top circuit board horizontal limiting plane for sliding along the top circuit board limiting rib. The rear side of the top circuit board abuts against the front side of the support sleeve.

[0013] The instrument front housing is provided with a buckle that matches the buckle slot, and the instrument front housing is provided with an instrument front housing support rib, which is used to hold the top circuit board.

[0014] This invention optimizes the structure of the measuring instrument, facilitating alignment during sequential stacking from the open end. The housing contains several circuit board support ribs and limiting ribs, allowing the corresponding circuit boards to be smoothly installed to their target positions, simplifying the assembly process. After the internal circuit boards are sequentially stacked and assembled, support sleeves are placed on top of them. Multiple limiting support ribs on the support sleeves simultaneously press down on the already installed circuit boards. The top layer of circuit boards is then stacked onto the support sleeves. Finally, the instrument's front shell is installed, and the front shell engages with the instrument housing, achieving a one-step fixation and locking of all the previously assembled parts.

[0015] More preferably, the horizontal limiting rib of the bottom circuit board is located inside the limiting boss of the support sleeve;

[0016] The support sleeve limiting boss is located on the left and right sides of the instrument housing.

[0017] More preferably, the intermediate circuit board limiting ribs are disposed on the left and right sides of the instrument housing;

[0018] The intermediate circuit board limiting rib includes a guide part and a limiting part arranged at the front and rear, and the limiting part is used to abut against the rear side of the intermediate circuit board.

[0019] The distance between the left and right ends of the front end of the guide increases from front to back.

[0020] It facilitates the sliding of the intermediate circuit board.

[0021] More preferably, the left and right sides of the frame structure are provided with concave portions, which serve as the limiting grooves for the support sleeve;

[0022] The limiting support rib includes a trapezoidal guide portion whose length increases from back to front in the vertical direction and a square limiting portion with equal length in the vertical direction.

[0023] The outer wall of the frame structure is provided with a horizontal limiting plane for the support sleeve, and the horizontal limiting plane of the support sleeve abuts against the limiting rib of the intermediate circuit board.

[0024] More preferably, the bottom circuit board and the middle circuit board are connected by mutually matching plug-in connectors;

[0025] The intermediate circuit board and the top circuit board are connected by mutually matching plug-in connectors.

[0026] More preferably, the intermediate circuit board is provided with wiring terminals;

[0027] The instrument housing has an operating port for exposing the wiring terminals;

[0028] The bottom circuit board has a clearance opening for avoiding the wiring terminals.

[0029] The wiring terminals of the intermediate circuit board are facilitated to extend outward from the instrument housing through the avoidance port and the operation port.

[0030] More preferably, mounting bracket guide rail grooves are provided on the left and right sides of the outer wall of the instrument housing;

[0031] The instrument housing is slidably connected to the support frame via the mounting bracket guide rail groove.

[0032] Easy to install.

[0033] More preferably, the front side of the instrument front housing is covered with a panel;

[0034] The instrument's front housing is equipped with a transparent viewing window;

[0035] A display screen is mounted on the top circuit board, and the transparent window is positioned corresponding to the display screen from the front and back.

[0036] When installing the instrument front cover, align the transparent window with the display screen and press to snap it in place.

[0037] The assembly method for a stacked, rapid-assembly structured measuring instrument includes the following steps:

[0038] Step 1: Install the bottom circuit board; Align the positioning holes with the positioning ribs of the bottom circuit board and press down to install. The horizontal limiting plane of the bottom circuit board moves along the horizontal limiting ribs of the bottom circuit board, and the vertical limiting plane moves along the vertical limiting ribs of the bottom circuit board. The back of the bottom circuit board is held in place by the support ribs of the bottom circuit board.

[0039] Step 2, install the intermediate circuit board; align the connector socket of the intermediate circuit board with the connector pin of the bottom circuit board, press the horizontal limiting plane of the intermediate circuit board along the limiting rib of the intermediate circuit board until the back of the intermediate circuit board contacts the protrusion of the limiting rib of the intermediate circuit board, at this time the wiring terminals can be connected to the outside through the reserved holes of the instrument housing;

[0040] Step 3, install the support sleeve; install the support sleeve limiting groove along the support sleeve limiting boss, and at the same time, the limiting support rib along the limiting groove of the middle circuit board, and press the horizontal limiting plane of the support sleeve along the limiting rib of the middle circuit board until the back side of the frame structure of the support sleeve is in contact with the front side of the middle circuit board.

[0041] Step 4: Install the top circuit board. Align the connector socket of the top circuit board with the connector pin of the middle circuit board. The limiting groove of the top circuit board follows the limiting boss of the support sleeve. Press the horizontal limiting plane of the top circuit board along the limiting rib of the top circuit board until the back of the top circuit board is in contact with the front of the support sleeve.

[0042] Step 5: Install the instrument front cover, ensuring the clips are correctly aligned with the clip slots and pressed down. The instrument front cover support rib should rest against the target stress point on the front of the top circuit board.

[0043] Step 6: Install the panel, align the corresponding panel part with the button and attach it to the front cover of the instrument panel;

[0044] Step 7: Install the support frame. The support frame should be installed along the guide rail groove of the mounting bracket, ensuring that the orientation is correct.

[0045] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0046] The positive and progressive effects of this invention are as follows:

[0047] This invention provides alignment guidance during sequential stacking from the open end. The housing contains several circuit board support ribs and limiting ribs to ensure smooth installation of the corresponding circuit boards to the target position. The positioning structure allows the connectors between circuit boards to align and plug in automatically, simplifying the assembly process. After the internal circuit boards are sequentially stacked and assembled, support sleeves are placed on top of the circuit boards. Multiple limiting support ribs on the support sleeves simultaneously press down on the already installed circuit boards. The top layer circuit board is then stacked onto the support sleeve. Finally, the instrument front cover is installed, and the instrument front cover interlocks with the instrument housing, achieving a one-step fixation and locking of all the previously assembled parts. Attached Figure Description

[0048] Figure 1 This is an exploded view of the present invention;

[0049] Figure 2 This is a schematic diagram of the instrument front housing structure of the present invention;

[0050] Figure 3 This is a schematic diagram of a structure of the instrument housing of the present invention;

[0051] Figure 4 This is a schematic diagram of the instrument housing from another perspective.

[0052] Figure 5 This is a schematic diagram of a top-level circuit board according to the present invention;

[0053] Figure 6 This is a schematic diagram of the top-level circuit board of the present invention from another perspective;

[0054] Figure 7 This is a schematic diagram of the support sleeve of the present invention;

[0055] Figure 8 This is a schematic diagram of the support sleeve of the present invention from another perspective;

[0056] Figure 9 This is a schematic diagram of the intermediate circuit board of the present invention;

[0057] Figure 10 This is a schematic diagram of the intermediate circuit board of the present invention from another perspective;

[0058] Figure 11 This is a schematic diagram of the bottom circuit board of the present invention;

[0059] Figure 12 This is a schematic diagram of the bottom circuit board of the present invention from another perspective;

[0060] Figure 13 This is a cross-sectional view of the present invention;

[0061] Figure 14(a) is a schematic diagram of the assembly step one of the present invention;

[0062] Figure 14(b) is a schematic diagram of the assembly step two of the present invention;

[0063] Figure 14(c) is a schematic diagram of the assembly step three of the present invention;

[0064] Figure 14(d) is a schematic diagram of the fourth assembly step of the present invention;

[0065] Figure 14(e) is a schematic diagram of the fifth assembly step of the present invention;

[0066] Figure 14(f) is a schematic diagram of the assembly step six of the present invention;

[0067] Figure 14(g) is a schematic diagram of the assembly step seven of the present invention. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0069] like Figures 1 to 1 As shown in Figure 4, in specific embodiment 1, a stacked rapid assembly structure measuring instrument includes a panel 1, an instrument front shell 2, an instrument housing 3, a top circuit board 4, a support sleeve 5, a middle circuit board 6, a bottom circuit board 7, and a support frame 8.

[0070] Inside the instrument housing 3, from back to front, are arranged the bottom circuit board 7, the middle circuit board 6, the support sleeve 5, and the top circuit board 4.

[0071] The instrument housing 3 is equipped with a bottom circuit board positioning rib 3h, a bottom circuit board horizontal limiting rib 3e, a bottom circuit board vertical limiting rib 3f, a bottom circuit board support rib 3g, a middle circuit board limiting rib 3d, a support sleeve limiting boss 3c, a top circuit board limiting rib 3b, and a snap-fit ​​groove 3a. Mounting bracket guide rail grooves 3i are provided on the left and right sides of the outer wall of the instrument housing 3; the instrument housing is slidably connected to the support frame 8 through the mounting bracket guide rail grooves, facilitating installation.

[0072] The bottom circuit board 7 has a positioning hole 7a, a bottom circuit board connector pin 7b, a bottom circuit board horizontal limiting plane 7c, a bottom circuit board vertical limiting plane 7d, a bottom circuit board front side 7e, and a bottom circuit board back side 7f. Specifically, the bottom circuit board has a positioning hole 7a that matches the bottom circuit board positioning rib 3h, the bottom circuit board has a bottom circuit board horizontal limiting plane 7c for sliding along the bottom circuit board horizontal limiting rib 3e, the bottom circuit board has a bottom circuit board vertical limiting plane 7d for sliding along the bottom circuit board vertical limiting rib 3f, and the rear side of the bottom circuit board (bottom circuit board back side 7f) abuts against the bottom circuit board support rib 3g.

[0073] The intermediate circuit board 6 includes an intermediate circuit board limiting groove 6a, an intermediate circuit board connector pin 6b, an intermediate circuit board connector socket 6c, an intermediate circuit board horizontal limiting plane 6d, an intermediate circuit board front side 6e, an intermediate circuit board back side 6f, and a terminal block 6g. Specifically, the intermediate circuit board 6 is provided with an intermediate circuit board horizontal limiting plane 6d for sliding along the intermediate circuit board limiting rib 3d, and the rear side of the intermediate circuit board abuts against the intermediate circuit board limiting rib 3d. Intermediate circuit board limiting grooves 6a are provided on both the left and right sides of the intermediate circuit board.

[0074] The support sleeve 5 has a support sleeve limiting groove 5a, a support rib limiting portion 5b, a support rib supporting portion 5c, a support sleeve horizontal limiting plane 5d, a support sleeve front 5e, and a support sleeve back 5f. The support sleeve includes a frame structure. The left and right sides of the frame structure are the support sleeve horizontal limiting planes 5d. The left and right sides of the frame structure are provided with vertically arranged limiting support ribs. Between the vertically arranged limiting support ribs on the same side of the frame structure, there is a support sleeve limiting groove for sliding along the support sleeve limiting protrusion 3c. The rear side of the limiting support rib (support rib supporting portion 5c) passes through the gap between the middle circuit board limiting groove 6a and the support sleeve limiting protrusion and abuts against the bottom circuit board. The rear side of the frame structure abuts against the middle circuit board. The frame structure has recessed parts on the left and right sides, which serve as support sleeve limiting grooves; the limiting support ribs include trapezoidal guide parts with increasing length from back to front in the vertical direction and square limiting parts with equal length in the vertical direction; the horizontal limiting plane 5d of the support sleeve abuts against the limiting rib 3d of the middle circuit board.

[0075] The top circuit board 4 has a top circuit board limiting groove 4a, a display screen 4b, a top circuit board connector socket 4c, a top circuit board horizontal limiting plane 4d, a top circuit board front side 4e, a top circuit board back side 4f, and a button 4g. Specifically, the top circuit board 4 has a top circuit board limiting groove 4a that slides along the supporting sleeve limiting protrusion 3c, and a top circuit board horizontal limiting plane 4d that slides along the top circuit board limiting rib 3b. The rear side of the top circuit board (top circuit board back side 4f) abuts against the front side of the supporting sleeve.

[0076] The front housing 2 of the instrument is provided with a buckle 2a that matches the buckle slot, and the front housing of the instrument is provided with a front housing support rib 2b, which is used to hold the top circuit board (front side 4e of the top circuit board).

[0077] This invention optimizes the structure of the measuring instrument, facilitating alignment during sequential stacking from the open end. The housing contains several circuit board support ribs and limiting ribs, allowing the corresponding circuit boards to be smoothly installed to their target positions, simplifying the assembly process. After the internal circuit boards are sequentially stacked and assembled, support sleeves are placed on top of them. Multiple limiting support ribs on the support sleeves simultaneously press down on the already installed circuit boards. The top layer of circuit boards is then stacked onto the support sleeves. Finally, the instrument's front shell is installed, and the front shell engages with the instrument housing, achieving a one-step fixation and locking of all the previously assembled parts.

[0078] The horizontal limiting rib 3e of the bottom circuit board is located inside the limiting boss of the support sleeve; the limiting boss of the support sleeve is set on the left and right sides of the instrument housing.

[0079] The intermediate circuit board limiting ribs 3d are set on the left and right sides of the instrument housing; the intermediate circuit board limiting ribs include front and rear guide parts and limiting parts, the limiting parts are used to abut the rear side of the intermediate circuit board; the distance between the left and right ends of the front end of the guide parts increases from front to back. This facilitates the sliding of the intermediate circuit board.

[0080] The bottom circuit board 7 and the middle circuit board 6 are connected by mutually matching plug-in connectors; the middle circuit board and the top circuit board are connected by mutually matching plug-in connectors.

[0081] The intermediate circuit board 6 is equipped with wiring terminals; the instrument housing has an operating port for exposing the wiring terminals; the bottom circuit board 7 has a clearance opening for avoiding the wiring terminals. This allows the wiring terminals of the intermediate circuit board to extend outward from the instrument housing via the clearance opening and the operating port.

[0082] The front side of the instrument front cover 2 is covered with a panel; the instrument front cover 2 is provided with a transparent window; a display screen 4b is installed on the top circuit board 4, and the transparent window and the display screen 4b are arranged correspondingly. When installing the instrument front cover, align the transparent window with the display screen and press it to snap it in place.

[0083] The assembly method for a stacked, rapid-assembly structured measuring instrument includes the following steps:

[0084] Step 1: Install the bottom circuit board 7 as shown in Figure 14(a); align the positioning hole 7a with the positioning rib 3h of the bottom circuit board and press it down to install. The horizontal limiting plane 7c of the bottom circuit board moves along the horizontal limiting rib 3e of the bottom circuit board, and the vertical limiting plane 7d moves along the vertical limiting rib 3f of the bottom circuit board. The reverse side 7f of the bottom circuit board is held in place by the support rib 3g of the bottom circuit board, the boss at the vertical limiting rib 3f of the bottom circuit board, and the boss at the positioning rib 3h of the bottom circuit board.

[0085] Step 2: Install the intermediate circuit board 6 as shown in Figure 14(b); align the intermediate circuit board connector socket 6c with the bottom circuit board connector pin 7b, press the horizontal limiting plane 6d of the intermediate circuit board along the limiting rib 3d of the intermediate circuit board until the reverse side 6f of the intermediate circuit board contacts the boss of the limiting rib 3d of the intermediate circuit board. At this time, the wiring terminal 6g can be connected to the outside through the reserved hole of the instrument housing 3.

[0086] Step 3: Install the support sleeve 5 as shown in Figure 14(c); install the support sleeve limiting groove 5a along the support sleeve limiting boss 3c, and at the same time, the limiting support rib along the middle circuit board limiting groove 6a, and press the support sleeve horizontal limiting plane 5d along the middle circuit board limiting rib 3d until the rear side of the frame structure of the support sleeve is in contact with the front side 6e of the middle circuit board.

[0087] Step 4: Install the top circuit board 4 as shown in Figure 14(d). Align the top circuit board connector socket 4c with the middle circuit board connector pin 6b. Press the top circuit board limiting groove 4a along the support sleeve limiting boss 3c and the top circuit board horizontal limiting plane 4d along the top circuit board limiting rib 3b until the back side 4f of the top circuit board is in contact with the front side 5e of the support sleeve.

[0088] Step 5: Install the instrument front cover 2 as shown in Figure 14(e). Align the transparent display window of the instrument front cover 2 with the display screen 4b and press it down. The buckle 2a should be correctly aligned with the buckle slot 3a. The instrument front cover support rib 2b should abut against the target stress point on the front of the top circuit board 4e.

[0089] Step 6: Install panel 1 as shown in Figure 14(f), align the corresponding panel part with button 4g and attach it to the front cover 2 of the instrument.

[0090] Step 7: Install the support frame 8 as shown in Figure 14(g). The support frame 8 is installed along the guide rail groove 3i of the mounting frame, ensuring that the orientation is correct.

[0091] The fixing principles of each part of the instrument are as follows:

[0092] The approximate position of the bottom circuit board 7 is determined by the cooperation of the positioning hole 7a and the bottom circuit board positioning rib 3h. The horizontal limiting plane 7c of the bottom circuit board is limited by the inclined surface of the horizontal limiting rib 3e, and the vertical limiting plane 7d of the bottom circuit board is limited by the inclined surface of the vertical limiting rib 3f. The reverse side 7f of the bottom circuit board is abutted by the bosses of the bottom circuit board support rib 3g, the bottom circuit board positioning rib 3h, and the bottom circuit board vertical limiting rib 3f. A fitting gap is left between the support part 5c of the support rib and the front side 7e of the bottom circuit board, ultimately fixing the bottom circuit board 7 inside the instrument. The horizontal limiting rib 3e of the bottom circuit board is provided with an inclined surface to guide the horizontal limiting plane 7c of the bottom circuit board. The vertical limiting rib 3f of the bottom circuit board is provided with an inclined surface to guide the vertical limiting plane 7d of the bottom circuit board.

[0093] Through the cooperation of the supporting rib limiting part 5b and the intermediate circuit board limiting groove 6a, the intermediate circuit board 6 is vertically limited, the horizontal limiting plane 6d of the intermediate circuit board is limited by the inclined surface of the intermediate circuit board limiting rib 3d, the reverse side 6f of the intermediate circuit board and the boss of the intermediate circuit board limiting rib 3d have a fitting gap, and the front side 6e of the intermediate circuit board and the reverse side 5f of the supporting sleeve make contact and fit, finally fixing the intermediate circuit board 6 inside the instrument. The intermediate circuit board limiting rib 3d is provided with an inclined surface to guide the horizontal limiting plane 6d of the intermediate circuit board.

[0094] Through the cooperation of the support sleeve limiting boss 3c and the support sleeve limiting groove 5a, the support sleeve 5 is vertically limited, the horizontal limiting plane 5d of the support sleeve is limited by the inclined surface of the intermediate circuit board limiting rib 3d, the front side 5e of the support sleeve contacts and cooperates with the back side 4f of the top layer circuit board, and the back side 5f of the support sleeve contacts and cooperates with the front side 6e of the intermediate circuit board, finally fixing the support sleeve 5 inside the instrument. The intermediate circuit board limiting rib 3d is provided with a guiding inclined surface to guide the horizontal limiting plane 5d of the support sleeve.

[0095] Through the cooperation of the support sleeve limiting boss 3c and the top circuit board limiting groove 4a, the top circuit board 4 is vertically limited, the horizontal limiting plane 4d of the top circuit board is limited by the inclined surface of the top circuit board limiting rib 3b, the front side 4e of the top circuit board is abutted by the support rib 2b, and the back side 4f of the top circuit board and the front side 5e of the support sleeve are in contact and cooperate, finally fixing the top circuit board 4 inside the instrument. The top circuit board limiting rib 3b is provided with a guiding inclined surface to guide the horizontal limiting plane 4d of the top circuit board.

[0096] The instrument housing is designed with a micro-conical structure whose size gradually decreases from the opening to the bottom.

[0097] The cooperation of the buckle 2a and the buckle groove 3a ensures the support of the instrument front shell support rib 2b to the middle circuit board 6, the support sleeve 5 and the top circuit board 4, and at the same time the instrument front shell 2 and the instrument housing 3 are finally combined and fixed.

[0098] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A stacked, quick-assembly structured measuring instrument, comprising a front casing, a housing, a bottom circuit board, a middle circuit board, and a top circuit board, characterized in that, The instrument housing contains, from back to front, the bottom circuit board, the middle circuit board, the support sleeve, and the top circuit board. The instrument housing is provided with bottom circuit board positioning ribs, bottom circuit board horizontal limiting ribs, bottom circuit board vertical limiting ribs, bottom circuit board support ribs, middle circuit board limiting ribs, support sleeve limiting bosses, top circuit board limiting ribs, and buckle grooves. The bottom circuit board has positioning holes that match the positioning ribs of the bottom circuit board. The bottom circuit board has a horizontal limiting plane for sliding along the horizontal limiting ribs of the bottom circuit board. The bottom circuit board also has a vertical limiting plane for sliding along the vertical limiting ribs of the bottom circuit board. The rear side of the bottom circuit board abuts against the support ribs of the bottom circuit board. The intermediate circuit board is provided with a horizontal limiting plane for sliding along the limiting rib of the intermediate circuit board, and the rear side of the intermediate circuit board abuts against the limiting rib of the intermediate circuit board. The intermediate circuit board has limiting grooves on both the left and right sides. The support sleeve includes a frame structure. The outer side of the frame structure is provided with a horizontal limiting plane for sliding along the limiting rib of the intermediate circuit board. The left and right sides of the frame structure are provided with vertically arranged limiting support ribs. Between the vertically arranged limiting support ribs on the same side of the frame structure, there is a supporting sleeve limiting groove for sliding along the limiting protrusion of the support sleeve. The rear side of the frame structure abuts against the intermediate circuit board. The top circuit board has a top circuit board limiting groove that slides along the limiting protrusion of the support sleeve. The top circuit board has a top circuit board horizontal limiting plane for sliding along the top circuit board limiting rib. The rear side of the top circuit board abuts against the front side of the support sleeve. The instrument front housing is provided with a buckle that matches the buckle slot, and the instrument front housing is provided with an instrument front housing support rib, which is used to hold the top circuit board.

2. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The horizontal limiting rib of the bottom circuit board is located inside the limiting boss of the support sleeve. The support sleeve limiting boss is located on the left and right sides of the instrument housing.

3. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The intermediate circuit board limiting ribs are located on the left and right sides of the instrument housing; The intermediate circuit board limiting rib includes a guide part and a limiting part arranged at the front and rear, and the limiting part is used to abut against the rear side of the intermediate circuit board. The distance between the left and right ends of the front end of the guide increases from front to back.

4. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The frame structure has recessed portions on its left and right sides, which serve as the limiting grooves for the support sleeve. The limiting support rib includes a trapezoidal guide portion whose length increases from back to front in the vertical direction and a square limiting portion with equal length in the vertical direction. The outer wall of the frame structure is provided with a horizontal limiting plane for the support sleeve, and the horizontal limiting plane of the support sleeve abuts against the limiting rib of the intermediate circuit board.

5. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The bottom circuit board and the middle circuit board are connected by mutually matching plug-in connectors. The intermediate circuit board and the top circuit board are connected by mutually matching plug-in connectors.

6. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The intermediate circuit board is equipped with wiring terminals; The instrument housing has an operating port for exposing the wiring terminals; The bottom circuit board has a clearance opening for avoiding the wiring terminals.

7. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, Mounting bracket guide rail grooves are provided on the left and right sides of the outer wall of the instrument housing; The instrument housing is slidably connected to the support frame via the mounting bracket guide rail groove.

8. The measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, The front side of the instrument housing is covered with a panel; The instrument's front housing is equipped with a transparent viewing window; A display screen is mounted on the top circuit board, and the transparent window is positioned correspondingly to the display screen. When installing the instrument front cover, align the transparent window with the display screen and press to snap it in place.

9. The assembly method of the measuring instrument with a stacked rapid assembly structure as described in claim 1, characterized in that, Includes the following steps: Step 1: Install the bottom circuit board; Align the positioning holes with the positioning ribs of the bottom circuit board and press down to install. The horizontal limiting plane of the bottom circuit board moves along the horizontal limiting ribs of the bottom circuit board, and the vertical limiting plane moves along the vertical limiting ribs of the bottom circuit board. The back of the bottom circuit board is held in place by the support ribs of the bottom circuit board. Step 2, install the intermediate circuit board; align the connector socket of the intermediate circuit board with the connector pin of the bottom circuit board, press the horizontal limiting plane of the intermediate circuit board along the limiting rib of the intermediate circuit board until the back of the intermediate circuit board contacts the protrusion of the limiting rib of the intermediate circuit board, at this time the wiring terminals can be connected to the outside through the reserved holes of the instrument housing; Step 3, install the support sleeve; install the support sleeve limiting groove along the support sleeve limiting boss, and at the same time, the limiting support rib along the limiting groove of the middle circuit board, and press the horizontal limiting plane of the support sleeve along the limiting rib of the middle circuit board until the back side of the frame structure of the support sleeve is in contact with the front side of the middle circuit board. Step 4: Install the top circuit board. Align the connector socket of the top circuit board with the connector pin of the middle circuit board. The limiting groove of the top circuit board follows the limiting boss of the support sleeve. Press the horizontal limiting plane of the top circuit board along the limiting rib of the top circuit board until the back of the top circuit board is in contact with the front of the support sleeve. Step 5: Install the instrument front cover, ensuring the clips are correctly aligned with the clip slots and pressed down. The instrument front cover support rib should rest against the target stress point on the front of the top circuit board. Step 6: Install the panel, align the corresponding panel part with the button and attach it to the front cover of the instrument panel; Step 7: Install the support frame. The support frame should be installed along the guide rail groove of the mounting bracket, ensuring that the orientation is correct.

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