Automatic thickness determining system for step-by-step rubber pressing of gasket forming machine and forming method of automatic thickness determining system

Abstract

The invention discloses an automatic thickness determining system for step-by-step glue pressing of a liner forming machine and a forming method of the automatic thickness determining system. The system comprises a gluing device, a step-by-step glue pressing device, an automatic sampling device and a control system. And the step-by-step glue pressing device is provided with at least three pressing rollers of which the heights are sequentially reduced along the conveying direction, and is driven by an independent servo motor. And the control system automatically calculates and sets the height of each compression roller according to the input initial thickness, target thickness and type of the liner. And the automatic sampling device cuts and samples for detection before the liner enters the oven. The method comprises the following steps: inputting parameters, automatically setting the compression rollers, gluing a liner, sequentially performing step-by-step glue pressing on the liner through the compression rollers of which the heights are decreased progressively, sampling and detecting after glue pressing, and determining whether the liner is fed into a drying oven or returning to glue pressing after parameters are adjusted according to a detection result. According to the invention, intelligent and accurate control of the thickness of the liner and uniform distribution of the colloid are realized, and material scrapping in the production process is greatly reduced through a pre-detection and closed-loop adjustment mechanism.

Description

Technical Field

[0001] This invention relates to the field of gasket molding technology, and more specifically, to an automatic thickness-fixing system for step-by-step adhesive pressing in a gasket molding machine and its molding method. Background Technology

[0002] Gaskets, such as sealing gaskets and buffer layers, are key basic components widely used in automotive manufacturing, aerospace, mechanical seals, and electronics. Their core functions rely on stable dimensional accuracy, uniform internal structure, and consistent physicochemical properties. A typical gasket molding process mainly includes three basic steps: adhesive application, pressing, and heat curing. Among these, the pressing process plays a crucial role in controlling the final thickness of the gasket, ensuring the uniform distribution and penetration of the adhesive in the base material, and thus guaranteeing the product's sealing performance, elasticity, and durability.

[0003] In existing technologies, the pressing and molding of gaskets mostly employs a single pressing or simple multiple pressing methods. Before production, operators need to pre-set the pressure or height parameters of the pressure rollers and the amount of adhesive applied based on experience. Once the production process starts, these parameters are usually fixed. After the adhesive is applied, the gasket goes through a pre-set pressing process and is then directly sent to an oven for heating and curing to complete the final shaping.

[0004] However, this traditional production model has several inherent drawbacks. First, the setting of process parameters relies heavily on the personal experience of technicians and lacks the support of precise theoretical calculation models. For gasket products of different materials and specifications, each change of production task requires tedious trial-and-error adjustments to find a suitable combination of parameters, resulting in long production preparation cycles, low efficiency, and poor process stability.

[0005] Secondly, and more significantly, there is a lack of effective online quality monitoring and feedback mechanisms. Since all quality inspections are conducted after the gaskets have fully cured in the oven, this is a typical "post-production inspection" model. If the inspection results reveal quality problems such as excessive product thickness, insufficient adhesive content, or uneven distribution, it means that all gaskets on the entire production line that have been glued and entered or passed through the oven are now defective and must be scrapped entirely. This not only results in a huge waste of raw materials, energy, and manpower, but also significantly increases production costs and severely impacts the continuity of production plans and delivery timeliness.

[0006] Furthermore, traditional pressing methods struggle to achieve gradient, gradual compression, and distribution of the adhesive within the gasket. Simple, forceful pressing can easily lead to uneven adhesive distribution, localized enrichment or deficiency, affecting the uniformity of product performance; it may also damage the fiber structure of the gasket substrate due to excessive pressure in a single application.

[0007] Therefore, there is an urgent need in the art to develop a gasket forming technology that can achieve precise thickness control and effectively predict and intervene in the quality of semi-finished products before this final curing link, so as to fundamentally improve the product qualification rate, reduce production costs and enhance the intelligent level of the process. Summary of the Invention

[0008] In order to overcome the above defects of the prior art, an automatic thickness determination system for step-by-step glue pressing of a gasket forming machine and its forming method are provided in an embodiment of the present invention.

[0009] To achieve the above object, the present invention provides an automatic thickness determination system for step-by-step glue pressing of a gasket forming machine, and its innovation lies in: including:

[0010] A glue application device for applying glue to the gasket;

[0011] A step-by-step glue pressing device, including at least three pressing rollers arranged in sequence along the gasket conveying direction, each pressing roller is driven by an independent servo motor to adjust its height, and the set heights of the pressing rollers decrease in sequence along the conveying direction;

[0012] An automatic sampling device, arranged downstream of the step-by-step glue pressing device, which includes at least one driving part and a cutting sampling head driven by the driving part, and is used for cutting a sample before the gasket enters the oven;

[0013] A control system, communicatively connected to the servo motor, the glue application device and the automatic sampling device, the control system includes a PLC and a user interface; the user interface is used to input the initial thickness d2 of the gasket, the preset final forming thickness d1 and select the gasket type; the PLC is configured to: determine the corresponding compression parameters according to the selected gasket type, and combine d1 and d2, calculate and control each servo motor to set the height of the corresponding pressing roller.

[0014] Further, the number of the above pressing rollers is three, and their set heights Y1, Y2, Y3 are calculated by the following formula:

[0015] Y1 = d2 - (d2 - d1) × K1

[0016] Y2 = d2 - (d2 - d1) × K2

[0017] Y3 = d2 - (d2 - d1) × K3

[0018] Among them, the value ranges of the compression coefficients K1, K2, K3 satisfy 0 < K1 < K2 < K3 < 1, and are determined in advance according to the material characteristics of the gasket, the colloid parameters and the process requirements.

[0019] Further, the above cutting sampling head includes a frame with a cavity, the bottom edge of the frame forms a cutting edge, and the depth of the cavity is less than the thickness of the gasket.

[0020] Furthermore, the aforementioned driving component is a cylinder, and the frame is connected to the end of the piston rod of the cylinder.

[0021] Furthermore, the aforementioned automatic sampling device includes three independently controlled drive components and a cutting sampling head, corresponding to three sampling stations arranged side by side.

[0022] Furthermore, the present invention also includes a testing station located next to the automatic sampling device for testing at least one of the following properties of the removed pad sample: loss on ignition, adhesive content, and specific gravity.

[0023] Furthermore, the system also includes a manually controlled transfer switch for controlling the transfer of the liner from the automatic sampling device station to the oven.

[0024] Furthermore, the aforementioned user interface also includes a parameter adjustment module, which is used to receive manually input correction values ​​for the amount of adhesive applied or the height of the pressure roller when the sample fails the test.

[0025] This invention provides a method for forming a gasket in an automatic thickness-fixing system, comprising the following steps:

[0026] Parameter input steps: Input d2 and d1 through the user interface and select the pad type;

[0027] Pressure roller setting steps: The control system calculates and sets the height of each pressure roller according to the compression parameters corresponding to the selected type and d1, d2;

[0028] Step-by-step adhesive application: After the gasket is coated with adhesive, it is pressed through rollers of decreasing height in sequence.

[0029] Sampling and testing steps: After the adhesive bonding is completed, the sample is cut and taken by the automatic sampling device, and the sample is tested on the spot;

[0030] Judgment execution steps: If the inspection is qualified, start the conveyor to let the pad enter the oven for molding; if it is unqualified, manually adjust the amount of glue or the setting value of the pressure roller, and then return to the step-by-step glue pressing step.

[0031] Furthermore, in the progressive pressing step, the linear pressure applied by the pressure roller to the pad increases with the number of pressing stages. The technical effects and advantages of this invention are as follows:

[0032] 1. It realizes the quality pre-control and closed-loop adjustment in the gasket forming process, greatly reducing the material scrap loss: By setting an automatic sampling device and a supporting detection station after the step-by-step rubber pressing device and before the oven, and using the parameter adjustment module and manual decision-making process (transfer switch) of the control system, the present invention constructs a closed-loop process chain of "rubber pressing - sampling - detection - decision - adjustment". This design advances the quality inspection node from after the final oven forming to after the rubber pressing process of semi-finished products. When unqualified is detected, the operator can immediately adjust the glue application amount or the height parameter of the pressure roller through the system, so that subsequent products can be corrected, and only a very small sample that has been cut is discarded. This fundamentally changes the passive situation of "post-mortem inspection and batch scrapping" in traditional technologies, realizes the transformation from "result inspection" to "process control", significantly reduces the large-scale waste of raw materials and energy caused by unqualified final products, and effectively improves the production yield and economy.

[0033] 2. It provides an intelligent step-by-step rubber pressing method based on a mathematical model, realizing the synchronous optimization of precise thickness control and uniform colloid distribution: The present invention abandons the parameter preset mode relying on experience and proposes an automatic calculation method for the height of the pressure roller driven by a specific mathematical formula Yn = d2 - (d2 - d1) × Kn. The control system automatically calculates and sets the height of each level of the pressure roller according to the input initial thickness d2, target thickness d1, and gasket type (corresponding to specific compression coefficients K1, K2, K3...). Among them, the compression coefficients strictly follow the constraint of increasing step by step (0 < K1 < K2 < K3... < 1), which ensures that the rubber pressing process is a progressive compression with decreasing height and increasing pressure step by step. This method can not only accurately and automatically control the gasket thickness at the target value d1, but more importantly, this progressive compression method promotes the gradient penetration and uniform distribution of the adhesive in the gasket substrate, thereby synchronously optimizing the physical properties of the gasket (such as density, elastic recovery rate, etc.) while ensuring dimensional accuracy, and solving the technical problems of uneven colloid distribution and poor product performance consistency in traditional single or simple rubber pressing processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic installation diagram of the automatic thickness determination system of the present invention in a continuous production line.

[0035] Figure 2 It is a schematic side view structure diagram of the step-by-step rubber pressing device.

[0036] Figure 3 It is a schematic structure diagram (cross-sectional view) of the automatic sampling device.

[0037] Figure 4 It is a logic block diagram of the control system of the present invention.

[0038] Figure 5This is a schematic flowchart of the gasket forming method of the present invention. Detailed Implementation

[0039] 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, and 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.

[0040] To enable examiners and those skilled in the art to fully understand the technical solution, working principle, and technical effects of the present invention, two preferred embodiments are described below. Embodiment 1 aims to detail the core of the present invention, a system and method for achieving step-by-step adhesive pressing using three pressure rollers; Embodiment 2 is used to illustrate the scalability of the core concept of the present invention, demonstrating how it can be applied to variant implementations with more than three pressure rollers, thereby supporting the general protection scope of "at least three pressure rollers" in the present invention.

[0041] Example 1

[0042] Please see Figure 1 This is a schematic diagram illustrating the application environment of the automatic thickness setting system of the present invention in a typical continuous production line for gaskets. The production line includes a frame and, sequentially arranged, an unwinding device 1, the automatic thickness setting system described in this invention, an oven 5, and a winding device 6. It can be understood that the unwinding device 1 and the winding device 6 are conventional equipment in the relevant field, used to achieve continuous conveying and winding of the gasket substrate. The core protection of this invention lies in the automatic thickness setting system composed of an adhesive application device 2, a step-by-step adhesive pressing device 3, an automatic sampling device 4, and a control system 7. The gasket 100 substrate is drawn from the unwinding device 1, processed by the system of this invention, enters the oven 5 for forming, and is finally wound up by the winding device 6.

[0043] The automatic thickness determination system of this embodiment specifically includes the following components:

[0044] 1. Glue application device

[0045] The gluing device 2 is located downstream of the unwinding device 1, and is, for example, a doctor blade or roller coating machine, with a metering pump (not shown in the figure) inside. This device is used to uniformly coat the surface of the moving pad 100 substrate with a predetermined amount of adhesive according to process requirements.

[0046] 2. Step-by-step adhesive bonding device

[0047] Please refer to the following: Figure 2, which is a schematic side view structure of a step-by-step rubber pressing device. The step-by-step rubber pressing device 3 includes a first pressing roller 31, a second pressing roller 32 and a third pressing roller 33 arranged in sequence along the conveying direction of the gasket 100. The center lines of the three pressing rollers are parallel and perpendicular to the gasket conveying direction. Each pressing roller (taking the first pressing roller 31 as an example) is driven by an independent servo motor (not marked in the figure) and a supporting precision screw lifting mechanism, so as to achieve independent and precise adjustment of the height.

[0048] One of the keys of the invention lies in the set height relationship of the three pressing rollers. As Figure 2 shown, the set height Y1 of the first pressing roller 31 is the highest, the set height Y2 of the second pressing roller 32 is the second, and the set height Y3 of the third pressing roller 33 is the lowest, thus forming a step with the height decreasing sequentially along the conveying direction in space. This arrangement makes the gasket 100 be subjected to progressive and step-by-step enhanced compression when passing through the three pressing rollers in sequence.

[0049] The calculation of the set heights Y1, Y2, Y3 of each pressing roller is the intelligent core to achieve "automatic thickness determination". It is specifically determined by the following formula:

[0050] Y1 = d2 - (d2 - d1) × K1

[0051] Y2 = d2 - (d2 - d1) × K2

[0052] Y3 = d2 - (d2 - d1) × K3

[0053] Where, d2 is the initial thickness of the gasket (before applying glue) input by the operator, and d1 is the preset final forming thickness. K1, K2, K3 are step-by-step compression coefficients bound to the gasket type, and their value ranges satisfy 0 < K1 < K2 < K3 < 1.

[0054] The physical meaning of this formula is that: (d2 - d1) represents the total thickness to be compressed; Kn represents the proportion of the total compression amount borne by the nth-level pressing roller. Since K1 < K2 < K3, it means that the first-level pressing roller performs mild pre-pressing, mainly to stabilize the glue layer; the second-level performs the main compression; the third-level performs fine pressing and final thickness determination. This distribution method based on the mathematical model replaces the traditional empirical debugging, ensures the smoothness of the compression process and the uniformity of the distribution of the colloid inside the gasket, not only controls the thickness, but also optimizes the product performance. The specific values of the coefficients K1, K2, K3 can be determined and stored through preliminary process tests according to the material characteristics (such as elastic modulus) of different gaskets and the colloid parameters (such as viscosity).

[0055] The method for determining and establishing the database of compression coefficients K1, K2, and K3 is as follows: For each type of pad to be produced, process experiments are conducted during the R&D phase. A representative combination of initial thickness d2 and target thickness d1 is selected, and trial production is carried out by adjusting the height of the three pressure rollers until a sample with qualified thickness and uniform colloid distribution is obtained. The optimal measured height values ​​Y1', Y2', and Y3' of the three pressure rollers at this time are recorded, and these values ​​are substituted into the formula Kn = (d2 - Yn') / (d2 - d1) to deduce the actual compression coefficients K1, K2, and K3 of the material under this thickness combination. Through fitting and optimization of multiple sets of experimental data, a set of optimal compression coefficients K1, K2, and K3 corresponding to this pad type is finally determined, and these are associated with the pad type label (such as "aramid felt - Type A") and stored in the parameter database of the control system. In actual production, the user only needs to select the pad type, and the system can automatically call the corresponding K coefficient set for calculation.

[0056] 3. Automatic sampling device

[0057] Please see Figure 3 This is a cross-sectional schematic diagram of the automatic sampling device. The automatic sampling device 4 is located downstream of the step-by-step adhesive pressing device 3 and before the inlet of the oven 5. In this embodiment, the device includes three cylinders 41 arranged in parallel, and a sampling frame 42 is fixedly connected to the lower end of the piston rod of each cylinder 41. The sampling frame 42 is rectangular, with a cavity 43 with an open bottom in the middle. The bottom edge of the cavity 43 is precision ground to form a sharp cutting edge 44.

[0058] A clever design element is that the depth H of the cavity 43 is designed to be less than the thickness of the liner 100 after adhesive bonding. For example, H is set to 2mm, while the thickness of the liner after adhesive bonding is approximately 3-4mm. When the cylinder 41 drives the sampling frame 42 to press down, the cutting edge 44 cuts the liner 100. The cut sample is temporarily adsorbed inside the cavity 43 due to the adhesive properties. Since H is less than the liner thickness, a portion of the sample protrudes outside the cavity 43, forming a natural clamping part. This allows the operator to easily pick up the sample with tweezers, eliminating the need for complex ejection or vacuum adsorption mechanisms inside the sampling head, simplifying the structure and improving reliability.

[0059] 4. Control System

[0060] Please see Figure 4 This is a logic block diagram of the control system of the present invention. The control system 7 is the "brain" that coordinates the operation of the entire system. It includes a programmable logic controller (PLC) and a human-machine interface (such as an industrial touch screen).

[0061] The core function of the user interface is to input the initial thickness d2 of the pad, the preset final molding thickness d1, and select the pad type.

[0062] The PLC is communicatively connected to all servo motors M1, M2, and M3, the metering pump of the gluing device 2, and the cylinder 41 of the automatic sampling device 4. The PLC is configured to execute the following core logic: receive d1, d2, and the pad type input from the user interface; query the internally stored parameter database based on the pad type to obtain the corresponding compression coefficients K1, K2, and K3; then calculate Y1, Y2, and Y3 using the aforementioned formulas; finally, send control commands to the corresponding servo motors to drive the pressure rollers to rise and fall to the set height. Simultaneously, the PLC also controls the glue dispensing amount of the gluing device and the cylinder action timing of the automatic sampling device.

[0063] The system also includes a testing station located next to the automatic sampling device 4, equipped with a loss on ignition analyzer, adhesive content analyzer, and other equipment for rapid testing of the collected samples. The user interface also includes a parameter adjustment module, which receives manually input correction values ​​for adhesive application amount or pressure roller height when a test fails. A manually controlled conveyor switch is located before the entrance to the drying oven 5; the operator decides whether to activate the conveyor based on the test results to feed the pad into the drying oven.

[0064] The working principle and method of this invention are as follows:

[0065] Combination Figure 5 The flowchart of the gasket forming method shown is illustrated below. The specific workflow of this embodiment is as follows:

[0066] S1: Parameter Input Step. The operator inputs the initial thickness d2 and the target final thickness d1 of the current batch of pads through the user interface, and selects the pad type (such as "Aramid Felt Type A") from the drop-down menu.

[0067] S2: Pressure Roller Setting Steps. The control system 7 retrieves preset values ​​K1, K2, and K3 from the database based on the selected padding type. Combining these with d1 and d2, it automatically calculates Y1, Y2, and Y3 using a formula. Subsequently, the PLC controls the servo motors M1, M2, and M3 to precisely drive the first, second, and third pressure rollers to the calculated height.

[0068] S3: Step-by-step adhesive application. The gasket 100 substrate is drawn out by the unwinding device 1, uniformly coated with adhesive by the adhesive application device 2, and then sequentially enters the step-by-step adhesive application device 3. The gasket first passes through the first pressure roller 31 with a height of Y1, undergoing initial compression; then it passes through the lower second pressure roller 32, where the compression increases; finally, it passes through the lowest third pressure roller 33, achieving the final thickness. During this process, due to the decreasing height of the pressure rollers, the linear pressure on the gasket actually increases step by step, ensuring sufficient penetration and uniform distribution of the adhesive.

[0069] S4: Sampling and testing step. After the gasket is completed with pressure-sensitive adhesive application, it travels to the 4th station of the automatic sampling device. The PLC controls one of the cylinders 41 to actuate, driving the sampling frame 42 to press down, and using the cutting edge 44 to cut off a sample. The operator removes the sample and sends it to the testing station to quickly test key performance parameters such as the loss on ignition and adhesive content.

[0070] S5: Judgment and execution step. The system (or the operator) makes a judgment based on the test results:

[0071] If the test is qualified, the operator manually activates the transfer switch, and this section of the gasket is sent into the oven 5 for heating and curing to form a final qualified product.

[0072] If the test is unqualified, the operator adjusts the set value of the adhesive application amount appropriately or finely tunes the set value of the pressure roller height according to experience or judgment through the parameter adjustment module of the user interface. After the parameters are corrected, the system does not scrap the gaskets that have already been produced, but instead makes the subsequent gaskets be reprocessed starting from the "step-by-step pressure-sensitive adhesive application step S3" based on the new parameters. This "detection - feedback - adjustment" closed-loop control mechanism intercepts unqualified products in front of the oven, only wasting a small amount of sampling materials and avoiding the loss of scrapping the entire batch of materials in the traditional process.

[0073] Embodiment 2

[0074] The main difference between this embodiment and Embodiment 1 is that the step-by-step pressure-sensitive adhesive application device is provided with four pressure rollers. This is to illustrate the scalability of the core technical concept of the present invention to support the general expression of "at least three pressure rollers" in the present invention.

[0075] In this embodiment, the first, second, third, and fourth pressure rollers are sequentially arranged along the gasket transfer direction. Correspondingly, the calculation formula in the control system is extended to:

[0076] Y1 = d2 - (d2 - d1) × K1

[0077] Y2 = d2 - (d2 - d1) × K2

[0078] Y3 = d2 - (d2 - d1) × K3

[0079] Y4 = d2 - (d2 - d1) × K4

[0080] Among them, the compression coefficients satisfy 0 < K1 < K2 < K3 < K4 < 1. For this four-pressure-roller configuration, the four-element compression coefficient group K1, K2, K3, K4 corresponding to different gasket types is stored in the parameter database.

[0081] Increasing the number of pressure rollers can further refine the compression gradient, resulting in more precise thickness control and more uniform colloid distribution. This is particularly suitable for the production of special gaskets with extremely high requirements for thickness tolerance or performance consistency. Apart from the number of pressure rollers and related calculation parameters, the rest of the system components (glue application device, automatic sampling device, control system architecture, and workflow) are the same as in Example 1, and also realize the functions of automatic thickness determination, pre-sampling detection, and closed-loop process adjustment.

[0082] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0083] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0084] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0085] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic thickness-fixing system for step-by-step adhesive pressing in a gasket molding machine, characterized in that: Comprising: A gluing device for gluing the gasket; A step-by-step pressure gluing device, including at least three pressure rollers arranged in sequence along the gasket conveying direction. Each of the pressure rollers is driven by an independent servo motor to adjust its height, and the set heights of the pressure rollers decrease in sequence along the conveying direction; An automatic sampling device, arranged downstream of the step-by-step pressure gluing device, which includes at least one driving member and a cutting sampling head driven by the driving member, for cutting a sample before the gasket enters the oven; A control system, communicatively connected to the servo motor, the gluing device and the automatic sampling device. The control system includes a PLC and a user interface; the user interface is used to input the initial thickness d2 of the gasket, the preset final forming thickness d1 and select the gasket type; the PLC is configured to: determine the corresponding compression parameters according to the selected gasket type, and combine d1 and d2, calculate and control each servo motor to set the height of the corresponding pressure roller.

2. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket molding machine according to claim 1, characterized in that: The number of the pressure rollers is three, and their set heights Y1, Y2, Y3 are calculated by the following formulas: Y1 = d2 - (d2 - d1) × K1 Y2 = d2 - (d2 - d1) × K2 Y3 = d2 - (d2 - d1) × K3 Wherein, the value ranges of the compression coefficients K1, K2, K3 satisfy 0 < K1 < K2 < K3 < 1, and are determined in advance according to the material properties of the gasket, the colloid parameters and the process requirements.

3. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket forming machine according to claim 1, characterized in that: The cutting sampling head includes a frame with a cavity. The bottom edge of the frame forms a cutting edge, and the depth of the cavity is less than the thickness of the gasket.

4. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket molding machine according to claim 3, characterized in that: The driving member is a cylinder, and the frame is connected to the end of the piston rod of the cylinder.

5. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket forming machine according to claim 1, characterized in that: The automatic sampling device includes three independently controlled driving members and cutting sampling heads, corresponding to three side-by-side sampling stations respectively.

6. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket forming machine according to claim 1, characterized in that: It further includes a detection station arranged beside the automatic sampling device, for performing at least one performance detection of the loss on ignition, glue content and bk value of the taken gasket sample.

7. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket molding machine according to claim 1, characterized in that: The system further includes a transfer switch manually controlled, for controlling the transfer of the gasket from the automatic sampling device station to the oven.

8. The automatic thickness-fixing system for step-by-step adhesive pressing in a gasket forming machine according to claim 1, characterized in that: The user interface further includes a parameter adjustment module, for receiving the manually input glue application amount correction value or pressure roller height correction value when the sample detection is unqualified.

9. A method for forming a gasket using an automatic thickness-fixing system as described in any one of claims 1-8, characterized in that: Including the following steps: Parameter input step: Input d2, d1 through the user interface and select the gasket type; Pressure roller setting step: The control system calculates and sets the heights of each pressure roller according to the compression parameters corresponding to the selected type and d1, d2; Step-by-step pressure gluing step: After the gasket is glued, it passes through each pressure roller with decreasing height in sequence for pressure gluing; Sampling and detection step: After the pressure gluing is completed, cut and sample through the automatic sampling device, and perform on-site detection on the sample; Judgment and execution step: If the detection is qualified, start the transfer to make the gasket enter the oven for forming; if unqualified, after manually adjusting the glue application amount or the set value of the pressure roller height, return to the step-by-step pressure gluing step.

10. The molding method according to claim 9, characterized in that: In the step-by-step pressure gluing step, the linear pressure exerted by the pressure roller on the gasket increases with the increase of the pressure gluing stages.

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