Rotary assembly tool for ceramic spark plug polymer buffer rubber sleeve

Abstract

The utility model discloses a ceramic spark plug high molecule buffer rubber bushing rotation assembly frock, and this frock includes rotation drive module, buffer direction module, torque control module, prevent over -twist module and state monitoring module. Through the high molecule rubber bushing of the composite constitution of elastic buffer layer and rigid direction layer and the spark plug ceramic body of covering, combine the flexible torque transmission of magneto rheological shaft coupling, realize stress dispersion and accurate direction. Dynamic torque controller is based on real -time monitoring ceramic strain data, real -time regulation output torque and trigger reverse rotation protection when over threshold. Prevent over -twist module through mechanical limit and electrical interlock block over -twist risk. The utility model adopts five -stage screw -in control strategy, and the laser positioning, adaptive speed regulation and pulse screw -in technology are fused, and the ceramic breakage, thread damage and assembly eccentricity problem are solved simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of internal combustion engine assembly, and in particular to a rotary assembly tooling for ceramic spark plug polymer buffer sleeves. Background Technology

[0002] In the field of internal combustion engine assembly, the cylinder head installation of ceramic spark plugs has long faced a systemic technical bottleneck. Traditional assembly tooling uses rigid metal clamps to hold the hexagonal part of the spark plug, and its structural defects lead to the following key problems:

[0003] Stress concentration damage: The metal clamp is in direct hard contact with the ceramic body, lacking a stress buffering mechanism, and the rotational torque is concentrated in a local area of ​​the ceramic, causing microcracks.

[0004] Lack of guiding accuracy: The alignment of the threaded hole relies on manual visual positioning, without a corresponding correction mechanism, which leads to the spark plug axis being misaligned with the cylinder head threaded hole;

[0005] Over-tightening risks out of control: Assembly depth is controlled by experience, and there is no mechanical-electric linkage protection mechanism, which can easily cause thread stripping or cylinder head damage.

[0006] Insufficient production line flexibility: The single tooling structure cannot be compatible with multiple specifications of spark plugs, and production line changes require shutdown and equipment replacement, which reduces production efficiency.

[0007] To address the aforementioned deficiencies, this invention provides a rotary assembly fixture for ceramic spark plug polymer buffer sleeves to solve the aforementioned technical problems. Utility Model Content

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0009] Therefore, to solve the above-mentioned technical problems, this utility model provides the following technical solution: a rotary assembly tooling for ceramic spark plug polymer buffer sleeves, comprising:

[0010] A rotary drive module, comprising a servo motor and a rotary sleeve driven by it;

[0011] The buffer guide module includes a rubber sleeve coaxially connected to the rotating sleeve. The rubber sleeve consists of an inner elastic buffer layer and an outer rigid guide layer. The inner elastic buffer layer covers the spark plug ceramic body.

[0012] The torque control module includes a magnetorheological coupling disposed between the rotating sleeve and the rubber sleeve, which is connected to a dynamic torque controller; the dynamic torque controller executes a dynamic torque compensation algorithm to correct the output torque in real time based on the micro-strain data of the spark plug ceramic body detected by the fiber optic grating sensor.

[0013] The anti-over-tightening module includes an annular limiting protrusion located at the end of the rubber sleeve, and a guide joint is arranged at the bottom of the annular limiting protrusion.

[0014] The condition monitoring module includes a piezoelectric thin film sensor embedded in the inner elastic buffer layer and a fiber optic grating sensor disposed on the inner wall of the rubber sleeve.

[0015] As a preferred embodiment of the ceramic spark plug polymer buffer sleeve rotary assembly tooling of this utility model, wherein: the inner elastic buffer layer is made of microporous high-damping elastic material, and the outer rigid guide layer is made of glass fiber reinforced engineering plastic.

[0016] As a preferred embodiment of the ceramic spark plug polymer buffer sleeve rotary assembly tooling of this utility model, wherein: the outer diameter of the annular limiting protrusion of the anti-overtightening module is larger than the size of the hexagonal part of the spark plug, and when the annular limiting protrusion contacts the cylinder head plane, it generates tactile feedback and triggers the servo motor to cut off power, and the cone angle of its bottom guide joint matches the spark plug thread guide angle.

[0017] As a preferred embodiment of the ceramic spark plug polymer buffer sleeve rotary assembly tooling described in this utility model, it further includes a modular adapter mechanism, comprising a quick-change interface disposed at the top of the sleeve and a detachable adapter ring, the inner diameter of which matches different spark plug specifications.

[0018] As a preferred embodiment of the ceramic spark plug polymer buffer sleeve rotary assembly tooling described in this utility model, it further includes a bearing tube module, which includes a bearing tube body, a servo motor arranged inside the bearing tube body, and a connector mounting position for connecting the equipment to monitor the torque at one end of the bearing tube body.

[0019] As a preferred embodiment of the ceramic spark plug polymer buffer sleeve rotary assembly tooling of this utility model, the bearing tube body is provided with a multi-cylinder branching channel inside, the bearing tube body is provided with a wire connector for wire access, and the bearing tube body is provided with a mounting bracket for fixing and adjusting the position of the tooling equipment.

[0020] As a preferred embodiment of the rotary assembly tooling for the ceramic spark plug polymer buffer sleeve of this utility model, the piezoelectric thin film sensors of the state monitoring module are arranged in an array to collect real-time stress distribution data on the surface of the spark plug ceramic body; the fiber optic grating sensor is arranged along the axial direction of the sleeve to monitor the micro-strain of the spark plug ceramic body.

[0021] The beneficial effects of this utility model are:

[0022] 1. This utility model features a polymer sleeve composed of an inner elastic buffer layer and an outer rigid guide layer. This layered buffer structure disperses the surface stress of the spark plug ceramic body through the elastic deformation of the inner layer, while the outer layer ensures accurate screwing trajectory, thus solving the technical problem of stress concentration damage caused by hard contact. A flexible torque transmission chain is formed by combining a magnetorheological coupling and a dynamic torque controller to suppress the peak impact torque. When the annular limiting protrusion contacts the cylinder head plane, it triggers the servo motor to cut off power, physically blocking the risk of over-tightening. Through the above structural design, the breakage rate of the spark plug ceramic body is significantly reduced, and assembly jamming caused by thread engagement deviation is eliminated.

[0023] 2. This utility model achieves rapid switching between different specifications of spark plugs through the combination of quick-change interface and detachable adapter ring, making the tooling compatible with the assembly of multiple models of spark plugs and adapting to the assembly needs of various specifications of spark plugs; through the above structural design, the tooling supports mixed production of multiple models of spark plugs, significantly reducing downtime for model changeover.

[0024] 3. This utility model uses a piezoelectric thin film sensor array to detect the stress distribution on the surface of the spark plug ceramic body, and a fiber optic grating sensor to capture micro-strain in real time, thus constructing a dual-redundant quality feedback system for the assembly process; the multi-cylinder branching channel inside the bearing tube realizes isolated transmission of sensor data and servo control signals, ensuring signal integrity; the connector mounting position provides an external output channel for assembly torque and stress data, supporting process parameter optimization and defect root cause analysis; through the above structural design, a full-process assembly data chain is constructed to support digital quality traceability. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0026] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0027] Figure 2 This is a schematic diagram of the structure of this utility model from a bottom view.

[0028] Figure 3 This is a front view structural diagram of the present invention.

[0029] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0030] Figure 5 This is a control logic block diagram of the rotation drive module and the state monitoring module of this utility model.

[0031] Figure 6 This is a flowchart illustrating the intelligent loss prevention method of this utility model.

[0032] In the diagram: 100, Rotary drive module; 101, Servo motor; 102, Rotary sleeve;

[0033] 200. Buffer guide module; 201. Rubber sleeve; 201a. Inner elastic buffer layer; 201b. Outer rigid guide layer;

[0034] 300. Torque control module;

[0035] 400. Anti-over-tightening module; 401. Annular limit protrusion; 402. Guide joint;

[0036] 500, Load-bearing pipe module; 501, Load-bearing pipe body; 502, Connector mounting position; 503, Mounting bracket; 504, Wire connector;

[0037] 600. Condition monitoring module; 601. Piezoelectric thin film sensor; 602. Fiber Bragg grating sensor;

[0038] 700. Modular adapter mechanism; 701. Quick-change interface; 702. Adapter ring. Detailed Implementation

[0039] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0042] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0043] Example 1

[0044] Reference Figures 1-5 This is the first embodiment of the present invention, which provides a rotary assembly tooling for ceramic spark plug polymer buffer sleeves, comprising the coordinated operation of the following modules:

[0045] 500 load-bearing pipe module:

[0046] An aluminum alloy tubular support tube 501 is used, and the servo motor 101 can be fixed to the inner cavity of the support tube 501 through a flange.

[0047] The top of the bearing tube 501 is provided with a connector mounting position 502 for connecting to an external PLC system to transmit torque data.

[0048] The bearing tube 501 has four branch channels inside, corresponding to the four-cylinder engine. The servo motor power line and sensor signal line are laid in the channel.

[0049] A threaded electrical connector 504 is installed on the middle side wall of the bearing pipe 501.

[0050] A mounting bracket 503 is welded to the bottom of the bearing tube 501. The mounting bracket 503 has mounting holes for fixing the tooling with bolts.

[0051] Rotary drive module 100:

[0052] The output shaft of the servo motor 101 is connected to the steel rotating sleeve 102; the end of the rotating sleeve 102 is machined with an external spline for transmitting torque.

[0053] Buffer Guiding Module 200:

[0054] The top end of the polymer composite sleeve 201 is connected to the rotating sleeve 102.

[0055] The inner elastic buffer layer 201a of the rubber sleeve is made of solid rubber and covers the ceramic body of the spark plug; the outer rigid guide layer 201b is made of hard PVC plastic.

[0056] Torque control module 300:

[0057] The input end of the magnetorheological coupling engages with the spline of the rotating sleeve 102, and the output end is connected to the rubber sleeve 201.

[0058] The dynamic torque controller adjusts the magnetic field strength of the magnetorheological coupling via wires.

[0059] Anti-over-twist module 400:

[0060] The annular limiting protrusion 401 is made of nylon and is integrally molded at the end of the rubber sleeve 201.

[0061] The raised bottom is fitted with a stainless steel guide connector 402, with an inner cone angle designed to guide the spark plug thread.

[0062] Status monitoring module 600:

[0063] The piezoelectric thin film sensor 601 is attached to the inner surface of the buffer layer 201a.

[0064] The fiber optic grating sensor 602 is glued and fixed along the axial direction of the adhesive sleeve 201.

[0065] In actual use: the servo motor 101 drives the rotating sleeve 102, and the torque is transmitted to the rubber sleeve 201 after being buffered by the magnetorheological coupling. During the process of the spark plug being screwed into the engine cylinder head, the piezoelectric thin film sensor 601 monitors the surface stress of the spark plug ceramic body, and the fiber optic sensor 602 monitors the micro-strain. When the annular limiting protrusion 401 contacts the cylinder head plane, the servo motor 101 stops working.

[0066] Example 2

[0067] Reference Figure 3 This is the second embodiment of the present invention, which differs from the first embodiment in that the following optimizations have been made based on embodiment 1:

[0068] The inner elastic buffer layer 201a is made of microporous polyurethane, providing high damping characteristics.

[0069] The outer rigid guide layer 201b is made of glass fiber reinforced engineering plastic.

[0070] The piezoelectric thin film sensor 601 is embedded in an array of inner elastic buffer layers 201a.

[0071] The fiber optic grating sensor 602 is arranged at equal intervals along the axial direction of the sleeve 201.

[0072] Modular adaptation:

[0073] The top of the rubber sleeve is equipped with a quick-change interface 701, which adopts a threaded structure;

[0074] The 702 adapter ring is available in two sizes: M12×1.25 and M14×1.25, with anti-slip textured inner wall.

[0075] When assembling M14 spark plugs, select the corresponding adapter ring 702 to snap into the quick-change interface 701. The glass fiber reinforced outer layer ensures the tightening rigidity, the microporous polyurethane layer absorbs radial impact, and the fiber optic sensor 602 provides real-time feedback on the axial deformation of the spark plug ceramic body to the control system.

[0076] Example 3

[0077] Reference Figures 1-2 This is the second embodiment of the present invention, which differs from the first embodiment in that the following optimizations are made based on the above embodiments:

[0078] Anti-over-tightening mechanism:

[0079] The outer diameter of the annular limiting protrusion 401 is larger than that of the standard spark plug hexagonal part.

[0080] The annular limiting protrusion 401 can integrate a sensor, which generates ≥5N tactile feedback and cuts off the power to the servo motor 101 when it contacts the cylinder head.

[0081] As the spark plug is screwed in, the annular limiting protrusion 401 contacts the cylinder head, and the tactile feedback triggers the servo motor 101 to stop suddenly.

[0082] Example 4

[0083] Reference Figures 5-6 This is the second embodiment of the present invention, which differs from the first embodiment in that it provides a specific application example of the rotary assembly fixture for the ceramic spark plug polymer buffer sleeve applicable to embodiments 1-3 above. In this embodiment, the assembly fixture specifically includes:

[0084] The piezoelectric thin film sensor array 601 has 24 measuring points arranged in a ring, with a spacing of 5 mm between the measuring points. The pressure measurement accuracy is ±0.05 MPa and the response time is no more than 1 ms. It is used to monitor the stress distribution of various parts on the surface of the spark plug ceramic body in real time.

[0085] Fiber Bragg grating sensor 602: Three measuring points are equidistantly arranged along the axial direction of the rubber sleeve 201, with a range of ±2000 microstrain and a resolution of 1 microstrain, used for high-precision sensing of microstrain in ceramics.

[0086] Laser rangefinder: can be placed at the front end of the tooling (not shown in the figure), with a working distance of 50 to 100 mm and a positioning accuracy of ±0.05 mm, used to achieve high-precision pre-alignment of spark plug and cylinder head threaded hole.

[0087] The execution layer includes key actuators such as servo motors and magnetorheological couplings:

[0088] Servo motor 101: Rated output torque is 30 N·m, speed range is 0 to 300 rpm, acceleration and deceleration response time is less than or equal to 10 ms, and dynamic response rotation control can be realized.

[0089] Magnetorheological coupling 301: It has an output torque adjustment range of 0 to 25 N·m and a magnetic field response time of less than or equal to 5 ms. It is used to achieve high-precision torque output adjustment and works with a dynamic controller to respond to micro-strain changes during the assembly process.

[0090] Dynamic torque controller: It adopts a control chip based on the ARM Cortex-M7 architecture and is equipped with a real-time operating system (RTOS) to realize functions such as real-time data acquisition, filtering calculation, and compensation command execution.

[0091] Priority arbitration section: A hardware interrupt channel allocation mechanism is adopted, in which the highest priority is triggered by strain exceeding the threshold to trigger reverse rotation, the medium priority is triggered by stress distribution non-uniformity exceeding the limit to trigger speed reduction, and the basic priority is the speed increase during the thread screwing process.

[0092] The intelligent damage prevention method for the ceramic spark plug polymer buffer sleeve rotary assembly fixture based on the above assembly fixture includes the following stages:

[0093] S1: Pre-alignment stage: The tooling is moved to a position 30mm above the cylinder head threaded hole, and the laser rangefinder is started to scan the center coordinates of the hole. When the positioning errors of the X, Y, and Z axes are all less than or equal to ±0.05mm, the positioning is considered successful and the next stage is started.

[0094] S2: Initial screw-in stage: Servo motor 101 runs at a speed of ≤50rpm, torque limit ≤5N·m, and torque rise slope ≤2N·m / s.

[0095] S3: Thread engagement stage: Upon entering this stage, the control system performs the following operations:

[0096] S31: Increased rotational speed:

[0097] Gradually and smoothly increase the screwing speed from the current speed to the base screwing speed to avoid the impact of a step response on the ceramic body; the base speed range is set at 100-150 rpm.

[0098] S32: Dynamic torque compensation algorithm:

[0099] S321: Acquires micro-strain signals 1000 times per second;

[0100] S322: Acquires signals from fiber optic grating sensor 602 at a frequency of 1kHz, and performs noise reduction processing using a second-order zero-phase Butterworth filter with a cutoff frequency of 100Hz.

[0101] S323: The real-time strain ε1 is output through the fiber optic grating sensor 602, and the target strain threshold ε2 is calculated using the following formula:

[0102] ε2=σ2 / E;

[0103] Where σ2 = 8 MPa, and E is the elastic modulus of the ceramic body (typical value 350 GPa);

[0104] S324: Based on the real-time measured ε1 and the target strain difference threshold ε2 for each sampling period, the torque correction is calculated using the following formula:

[0105] ΔT=K c ×(ε2-ε1);

[0106] Wherein, the compensation gain K c ∈[0.1, 0.5], unit: N·m / με;

[0107] K c The typical value is 0.3 N·m / με;

[0108] S325: When ε1>ε2, drive the servo motor 101 to rotate in the opposite direction for 0.1s at 50% of the current speed to quickly release local stress;

[0109] When reverse rotation is triggered, the dynamic torque controller forcibly interrupts other control commands and prioritizes the execution of the 0.1s reverse rotation action. After the action is completed, it automatically resets to the base speed of 100-150 rpm for the current stage.

[0110] It is worth noting that the 0.1s reverse rotation time is based on the stress relaxation time constant of the ceramic body. The stress relaxation time constant of the ceramic body material is τ=η / E, where η is the viscous modulus of the ceramic body and E is the elastic modulus of the ceramic body; the typical value is τ≈0.0034s; choosing a reverse rotation time of 0.1s, which is about 30 times the time constant τ, can ensure sufficient stress release and avoid the accumulation of microcracks.

[0111] S33: Stress non-uniformity control mechanism:

[0112] S331: Real-time calculation of the surface stress non-uniformity U of the spark plug ceramic body measured by all piezoelectric thin film sensors 601:

[0113]

[0114] Where, σ i The value of the surface stress of the spark plug ceramic body detected by the i-th piezoelectric thin film sensor 601 is expressed in MPa.

[0115] This represents the average surface stress of the spark plug ceramic body detected by each piezoelectric thin film sensor 601.

[0116] S332: When the piezoelectric thin film sensor 601 array of the condition monitoring module 600 detects that the stress distribution non-uniformity U on the surface of the spark plug ceramic body is greater than 20%, the screwing speed of the servo motor 101 in this stage is reduced by 30%, and after 2 seconds it is restored to the base speed of the current stage of 100-150 rpm.

[0117] Considering that the spark plug pitch is generally 1.25mm, at a base speed of 150rpm, the time taken for one turn is 0.4s. After reducing the speed to 105rpm, the time taken for one turn is about 0.57s. Continuing to reduce the speed for 2s is equivalent to about 3.5 turns of screwing in, which can complete the automatic adjustment of the off-center load. When the speed reduction is 30%, the stress non-uniformity improvement rate can reach 68%, which is better than the industry control target of 60%, while also taking into account the optimization of assembly time.

[0118] S34: Priority Arbitration Mechanism

[0119] If both strain exceeding the threshold and stress non-uniformity exceeding the limit exist simultaneously, the system will prioritize responding to strain-triggered reversal action, and then continue to perform deceleration operation after completion.

[0120] Each event has automatic reset logic to prevent loss of control caused by system misjudgment or nested responses.

[0121] S4: Critical Torque Stage

[0122] When the torque sensor detects an output torque of 15-18 N·m during the assembly process, it is determined that the critical thread lock-up range has been entered, triggering the servo motor to enter the "pulse screw-in mode". This means that the motor performs alternating operations of 200ms forward rotation and 100ms pause per cycle, and can only perform up to 10 cycles or end when the maximum torque limit is reached.

[0123] S5: Final tightening and locking stage:

[0124] The trigger condition for this stage is: the annular limiting protrusion 401 contacts the cylinder head plane, and the contact pressure value is ≥50N. The system immediately cuts off the power to the servo motor 101, stopping its rotation.

[0125] The following table shows the statistical data from a test conducted on 10,000 samples (NGK LFR5A spark plugs, cylinder head material aluminum-silicon-magnesium alloy (AlSi10Mg)) on a certain automotive engine assembly line:

[0126]

[0127] The table above shows that:

[0128] 1. The ceramic breakage rate of traditional tooling is as high as 3.2%, mainly due to the instantaneous fracture of brittle ceramics (elastic modulus E = 350 GPa) caused by torque overshoot or eccentric loading.

[0129] This invention utilizes a dynamic torque compensation algorithm to monitor the micro-strain data output by the fiber Bragg grating sensor 602 in real time. When the detected strain value exceeds the threshold ε2=σ2 / E, the servo motor 101 is immediately triggered to rotate in the opposite direction at 50% of its current speed for 0.1s, rapidly releasing local stress. This mechanism reduces the ceramic breakage rate to 0.18%, a reduction of 94.4%, solving the problem of ceramic brittleness during spark plug assembly.

[0130] 2. Traditional assembly methods are prone to overheating and seizing of the threaded pairs due to continuous rotation, with a damage rate of 1.8%.

[0131] This invention employs a pulsed screw-in mode, switching between alternating 200ms forward rotation and 100ms pause during the critical torque stage (15-18 N·m), effectively reducing frictional heat accumulation. Simultaneously, by controlling stress unevenness (reducing speed by 30% when U>20%), it avoids thread deformation caused by off-center loading. Ultimately, the thread damage rate is optimized to 0.05%, a reduction of 97.2%, significantly extending the life of the cylinder head threads.

[0132] 3. The concentricity deviation of traditional tooling is ±0.15mm, which is difficult to meet the stringent requirements (≤±0.05mm) for spark plug positioning in direct injection engines.

[0133] This invention utilizes laser pre-positioning (±0.05mm) and a 24-point piezoelectric thin-film sensor array to monitor and calculate the stress distribution non-uniformity U in real time. When U > 20%, the rotational speed is automatically adjusted to ensure the spark plug axis coincides with the center of the threaded hole. Actual concentricity deviation is reduced to ±0.04mm, improving accuracy by 73.3%, perfectly meeting the requirements of high-precision engine assembly.

[0134] 4. Due to the conservative control strategy of traditional tooling (≤50rpm throughout), the assembly time for a single part is 8.7s.

[0135] This invention dynamically optimizes the rotation speed within a safe threshold:

[0136] Avoid off-center loading during the initial screwing-in stage (≤50 rpm);

[0137] During the thread engagement stage, an exponential speed increase is used, reaching a maximum of 150 rpm.

[0138] During the critical torque stage, efficiency and safety are balanced through pulse mode.

[0139] The final assembly time per unit is reduced to 7.1 seconds, improving efficiency by 18.4%. Based on an annual production of 500,000 engines, this can save 2,200 hours of labor.

[0140] This invention overcomes three major technical bottlenecks—ceramic protection, assembly precision, and efficiency improvement—through an innovative design that combines "quantitative control of material properties + multi-sensor fusion (strain + stress monitoring) + hierarchical response arbitration (reverse rotation → deceleration → pulse mode)."

[0141] Note: The above data is based on the test results of NGK LFR5A spark plugs and AlSi10Mg cylinder heads. Specific parameters can be adjusted according to different models.

[0142] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rotary assembly fixture for ceramic spark plug polymer buffer sleeves, characterized in that: include: A rotary drive module (100) includes a servo motor (101) and a rotary sleeve (102) driven by it; The buffer guide module (200) includes a rubber sleeve (201) coaxially connected to the rotating sleeve (102). The rubber sleeve (201) is composed of an inner elastic buffer layer (201a) and an outer rigid guide layer (201b). The inner elastic buffer layer (201a) covers the spark plug ceramic body. The torque control module (300) includes a magnetorheological coupling disposed between the rotating sleeve (102) and the rubber sleeve (201), the magnetorheological coupling being connected to a dynamic torque controller; The anti-over-tightening module (400) includes an annular limiting protrusion (401) disposed at the end of the rubber sleeve (201), and a guide joint (402) is arranged at the bottom of the annular limiting protrusion (401). The status monitoring module (600) includes a piezoelectric thin film sensor (601) embedded in an inner elastic buffer layer (201a) and a fiber optic grating sensor (602) disposed on the inner wall of the sleeve (201).

2. The rotary assembly tooling for the ceramic spark plug polymer buffer sleeve as described in claim 1, characterized in that: The inner elastic buffer layer (201a) is made of a microporous high-damping elastic material, and the outer rigid guide layer (201b) is made of glass fiber reinforced engineering plastic.

3. The rotary assembly tooling for ceramic spark plug polymer buffer sleeves as described in claim 2, characterized in that: The outer diameter of the annular limiting protrusion (401) of the anti-over-tightening module (400) is larger than the size of the spark plug hexagonal part. When the annular limiting protrusion (401) contacts the cylinder head plane, it generates tactile feedback and triggers the servo motor (101) to cut off power. The cone angle of its bottom guide joint (402) matches the spark plug thread guide angle.

4. The rotary assembly tooling for ceramic spark plug polymer buffer sleeves as described in claim 3, characterized in that: It also includes a modular adapter mechanism (700), which includes a quick-change interface (701) located at the top of the rubber sleeve (201) and a detachable adapter ring (702), the inner diameter of which matches different spark plug specifications.

5. The rotary assembly tooling for ceramic spark plug polymer buffer sleeves as described in claim 4, characterized in that: It also includes a support tube module (500), which includes a support tube (501), a servo motor (101) arranged inside the support tube (501), and a connector mounting position (502) for connecting the monitoring torque of the equipment is provided at one end of the support tube (501).

6. The rotary assembly tooling for ceramic spark plug polymer buffer sleeves as described in claim 5, characterized in that: The bearing tube (501) is provided with a multi-cylinder branching channel inside. The bearing tube (501) is provided with a wire connector (504) for wire access. The bearing tube (501) is provided with a mounting bracket (503) for fixing and adjusting the position of the tooling equipment.

7. The rotary assembly tooling for ceramic spark plug polymer buffer sleeves as described in claim 6, characterized in that: The piezoelectric thin film sensors (601) of the condition monitoring module (600) are arranged in an array to collect the stress distribution data on the surface of the spark plug ceramic body in real time; the fiber optic grating sensor (602) is arranged along the axial direction of the rubber sleeve (201) to monitor the micro-strain of the spark plug ceramic body.

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