A method for improving the assembly quality of leak nozzles and an intelligent assembly device for leak nozzles.

Abstract

This invention relates to the field of precious metal product processing, specifically to an intelligent nozzle assembly device for improving nozzle assembly quality. The intelligent control system of this device includes an intelligent calibration unit for storing optimal assembly parameters and a PLC controller for controlling a Cartesian coordinate robot to assemble the nozzles. During assembly, the precious metal nozzle plate is first fixed to the positioning fixture of the intelligent nozzle assembly device. The optimal assembly scheme for the nozzle plate and nozzle is determined through calibration experiments. Then, based on the obtained optimal assembly scheme, the intelligent nozzle assembly device automatically assembles the nozzles onto the precious metal nozzle plate under the control of the PLC controller. This invention uses the optimal assembly parameters obtained in advance through calibration experiments to control the Cartesian coordinate robot to assemble the nozzles, significantly improving assembly quality while increasing assembly speed.

Description

Technical Field

[0001] This invention relates to the field of precious metal product processing, and specifically to a method for improving the assembly quality of leak nozzles and an intelligent assembly device for leak nozzles. Background Technology

[0002] In the glass fiber manufacturing process, the precious metal spindle plate equipped with drawing nozzles (hereinafter referred to as nozzles) is one of the key devices. Therefore, the assembly quality between the spindle plate and the nozzles plays a crucial role in subsequent processes and even the quality of the final product (glass fiber).

[0003] In the production of precious metal sprues, relying solely on manual labor to assemble the nozzles and sprues will cause the following problems:

[0004] ① High assembly skills required of workers: Due to differences in skill levels, work experience, and operating habits among different operators, the assembly quality can vary. Experienced operators may assemble the parts well, while novices may not be able to accurately control the installation force when installing the nozzle due to lack of familiarity with the operation. Excessive force may damage the nozzle or the nozzle plate, while insufficient force may result in the nozzle not being installed properly.

[0005] ② Assembly speed is limited:

[0006] The installation of each nozzle requires multiple manual steps, including positioning, insertion, and adjustment. The prolonged assembly work can lead to operator fatigue, further reducing assembly speed. In large-scale production, if a large number of nozzles and plates need to be assembled, manual assembly consumes a significant amount of time, impacting the overall production schedule.

[0007] Moreover, as production intensity increases, operator fatigue will continue to increase, causing operators to be unable to maintain their initial good working condition, resulting in a continuous decline in assembly speed and even assembly quality.

[0008] To avoid defects caused by manual assembly, CN110293078A discloses an automatic installation machine for wire drawing stencils and nozzles. While this equipment can improve the assembly efficiency of stencils and nozzles to some extent and avoid the defects of manual assembly, it does not consider how to improve assembly quality and ignores many factors that can affect it. For example, CN110293078A's automatic installation machine for wire drawing stencils and nozzles completes the assembly by moving the holes on the stencil under the pressing mechanism. During assembly, there may be problems with stencil clamping. With increased use, the clamping force between the moving table and the guide rail used to install the stencil decreases, and the stencil is prone to positional displacement during movement, leading to assembly errors and affecting the assembly quality of the nozzles. Ultimately, these errors accumulate during the assembly process, eventually leading to the overall assembly quality of the precious metal sprue not meeting requirements (for example, the sprue installation position may be offset, causing the sprue to crack, or the sprue assembly height may not meet requirements, or even the sprue assembly angle may be deviated, resulting in gaps between the assembled sprue and the sprue, and poor sealing).

[0009] If, after assembly, the leak nozzle is found to be of substandard quality during the acceptance process, rework is necessary, which is time-consuming and labor-intensive. Therefore, how to improve assembly speed while simultaneously enhancing assembly quality during the assembly of leak nozzles on precious metal plates has always been a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0010] The purpose of this invention is to address the shortcomings of existing technologies by providing a method and intelligent assembly device for improving the assembly quality of leak nozzles. By setting up an intelligent calibration unit for storing optimal assembly parameters, and using the optimal assembly parameters obtained in advance through calibration experiments, the invention controls a Cartesian coordinate robot to assemble leak nozzles, thereby improving assembly speed and significantly enhancing assembly quality.

[0011] The objective of this invention is achieved through the following approach:

[0012] A smart nozzle assembly device for improving nozzle assembly quality includes a workbench. The workbench is equipped with a Cartesian robot for assembling nozzle plates and a tooling fixture for fixing the nozzle plates. The end effector of the Cartesian robot is a pneumatic pressing device for pressing the nozzles. A vision recognition device is located beside the pneumatic pressing device. This vision recognition device is used to identify the center position of each hole on the nozzle plate. The vision recognition device is electrically connected to an intelligent calibration unit located on the workbench for acquiring and storing the optimal assembly parameters of the nozzle plate. The intelligent calibration unit is electrically connected to a PLC controller for controlling the Cartesian robot to assemble the nozzles. The pneumatic pressing device is connected to a vibratory feeder discharge mechanism located beside the workbench via a swing-arm type material distribution mechanism and a conveying pipe.

[0013] Preferably, the Cartesian coordinate robot includes an X-axis guide rail, a Y-axis guide rail, and a Z-axis guide rail. The two X-axis guide rails are set on the upper part of the worktable. The two ends of the Y-axis guide rail are respectively connected to the first slider on the X-axis guide rail. The Z-axis guide rail is connected to the second slider on the Y-axis guide rail. The Z-axis guide rail is provided with a third slider. The third slider is equipped with a pneumatic pressing device, a vision recognition device, and a swing arm type material distribution mechanism.

[0014] Preferably, the X-axis guide rail, Y-axis guide rail, and Z-axis guide rail are all made of linear motors.

[0015] Preferably, the pneumatic pressing device has a first through hole and a second through hole, which are connected to form a Y-shaped channel. The first through hole is an assembly hole perpendicular to the worktable surface. A punch driven by a cylinder is clearance-fitted with the first through hole. The second through hole is a feed hole connected to the discharge pipe of the swing-arm type dispensing mechanism. After the nozzle to be installed enters from the second through hole and moves to the first through hole, the cylinder drives the punch to push the nozzle out from the first through hole and assemble it into the hole of the nozzle plate.

[0016] The method for improving the assembly quality of leak nozzles using the above-mentioned intelligent leak nozzle assembly device includes the following steps:

[0017] 1) An intelligent calibration unit connected to a PLC controller is set in the intelligent control system of the intelligent assembly device for leak nozzles. This intelligent calibration unit is used to acquire and store the optimal assembly parameters.

[0018] 2) Fix the precious metal sprue plate on the positioning fixture of the intelligent assembly device for the sprue nozzle, and determine the optimal assembly scheme of the sprue plate and the sprue nozzle through calibration experiments.

[0019] 3) Based on the optimal assembly scheme obtained in step 2), the nozzle is automatically assembled onto the precious metal nozzle plate by the intelligent nozzle assembly device under the control of the PLC controller.

[0020] Preferably, in step 2), the calibration experiment includes the following steps:

[0021] 2-1) Based on the geometric parameters of the sprue and nozzle to be assembled, determine the range of assembly parameters according to empirical values;

[0022] 2-2) Arrange and combine the values ​​within the range of assembly parameters to form several trial assembly schemes;

[0023] 2-3) Under the control of the PLC controller, the nozzle is automatically assembled onto the precious metal nozzle plate according to the several trial assembly schemes obtained in step 2-2), and the acceptance data of each trial assembly scheme is recorded and stored in the intelligent calibration unit.

[0024] 2-4) Select the best assembly scheme from several assembly acceptance data as the best assembly scheme for the leak plate and leak nozzle, and use the leak nozzle intelligent assembly device to automatically assemble according to the best assembly scheme.

[0025] Preferably, the assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate.

[0026] Preferably, the geometric parameters of the squeegee include the number of holes in the squeegee, the diameter of the holes in the squeegee, and the thickness of the squeegee, and the geometric parameters of the nozzle include the outer diameter of the nozzle, the inner diameter of the nozzle, and the height of the nozzle.

[0027] Preferably, in step 3), the step of automatically assembling the nozzle onto the precious metal nozzle plate by the intelligent nozzle assembly device under the control of the PLC controller includes:

[0028] 3-1) Turn on the power of the intelligent assembly device, initialize the status of the intelligent assembly device, and return the position of the Cartesian coordinate robot to the origin.

[0029] 3-2) Select the optimal assembly parameters according to the model of the sprue plate and sprue nozzle by operating the human-machine interface;

[0030] 3-3) Clamp the sprue to be assembled onto the worktable of the intelligent assembly device, and put all the sprue nozzles to be assembled into the vibratory feeder discharge system of the intelligent assembly device.

[0031] 3-4) Start the intelligent assembly device to assemble all the nozzles to be assembled onto the nozzle plate.

[0032] Preferably, the intelligent assembly device assembles all the nozzles to be assembled onto the nozzle plate in two modes:

[0033] 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the sprue plate before assembling the sprue.

[0034] 3-4-2) Local scanning mode:

[0035] ① The intelligent assembly device obtains the center position of a hole on the sprue by scanning, and then assembles the sprue according to the center position of the hole;

[0036] ② Repeat step ① until all the nozzles corresponding to the holes of the squeegee are assembled.

[0037] The beneficial effects of this invention are as follows:

[0038] The intelligent control system includes an intelligent calibration unit for acquiring and storing the best assembly parameters, and a PLC controller for controlling the Cartesian coordinate robot (4) to assemble the nozzle. The PLC controller is connected to the intelligent calibration unit, so that the PLC controller can assemble the nozzle according to the best assembly parameters stored in the intelligent calibration unit.

[0039] This invention sets up an intelligent calibration unit for storing optimal assembly parameters. Using the optimal assembly parameters obtained in advance through calibration experiments, the Cartesian coordinate robot is controlled to assemble the nozzle, which greatly improves the assembly quality while increasing the assembly speed.

[0040] Preferably, the assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate.

[0041] This invention identifies the types of parameters that affect the assembly quality of the leak nozzle during the assembly process through experiments, and determines the specific values ​​corresponding to different leak nozzles and leak plates through calibration experiments, which serve as guiding data for the assembly process and greatly improve the assembly quality.

[0042] Preferably, in steps 3-4), the intelligent assembly device assembles all the nozzles to be assembled onto the nozzle plate in two modes:

[0043] 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the sprue plate before assembling the sprue.

[0044] The overall scanning mode performs a comprehensive scan of all the nozzle mounting holes on the entire precious metal nozzle plate. This method acquires overall information about the nozzle plate and nozzle mounting holes, including their relative positions and dimensional deviations, allowing for better consideration of the mutual influence between the nozzle plate and the nozzle mounting holes. By scanning to obtain the flatness information of the nozzle plate surface and the coordinates of each nozzle mounting hole, the assembly position of each nozzle can be precisely controlled from a macroscopic perspective during assembly. Based on this complete information, the position of the nozzles is adjusted so that each nozzle can be installed more accurately in the ideal position. In the assembly process of precious metal nozzles, where the assembly quality requirements of this invention are extremely high, this effectively reduces product quality problems caused by positional deviations.

[0045] While the overall scanning mode may involve relatively complex initial scanning work, during the actual assembly process, optimized algorithms can plan the assembly paths and sequences of all nozzles in one go. For example, in an automated assembly line, the data obtained from all scans can provide a complete assembly strategy for the robotic assembly system. The robot can then assemble all nozzles sequentially according to the pre-planned paths and action sequences, reducing adjustment and waiting time during the assembly process and improving overall assembly efficiency. Moreover, this approach can identify potential assembly conflicts or problems in advance, avoiding rework caused by frequent issues during assembly.

[0046] Furthermore, the overall scanning mode can provide a complete pre-assembly data baseline. After assembly, a full scan can be performed again to compare the actual data after assembly with the scan data before assembly, comprehensively checking the assembly quality. For example, in the assembly of precious metal sprues and nozzles, by comparing the scan data before and after, multiple quality indicators can be detected, such as whether the installation angle of each nozzle meets the requirements and whether the connection between the nozzle and the sprue is tight. This allows for the timely detection of potential quality issues and precise location of problems, facilitating targeted repairs or adjustments (such as the adjustment and correction of specific assembly parameter values ​​in this invention).

[0047] 3-4-2) Local scanning mode:

[0048] ① The intelligent assembly device obtains the center position of a hole on the sprue by scanning, and then assembles the sprue according to the center position of the hole;

[0049] ② Repeat step ① until all the nozzles corresponding to the holes of the squeegee are assembled.

[0050] Partial scanning mode scans only one nozzle and its corresponding nozzle mounting position at a time. This method focuses more on individual quality control. For individual nozzles with irregular shapes or special installation requirements, individual scanning can obtain more detailed characteristic information. For example, in the assembly of nozzles in some precious metal experimental devices, a certain nozzle may have a special internal structure or size. Individual scanning can focus on the details of this nozzle, ensuring the assembly quality of the nozzle.

[0051] Preferably, the pneumatic pressing device has a first through hole and a second through hole, which are connected to form a Y-shaped channel. The first through hole is an assembly hole perpendicular to the worktable surface. A punch driven by a cylinder is clearance-fitted with the first through hole. The second through hole is a feed hole connected to the discharge pipe of the swing-arm type dispensing mechanism. After the nozzle to be installed enters from the second through hole and moves to the first through hole, the cylinder drives the punch to push the nozzle out from the first through hole and assemble it into the hole of the nozzle plate.

[0052] This invention employs a pneumatic pressing device, in which a punch pushes the nozzle out of the first through hole and aligns the first through hole with the hole of the nozzle plate to be assembled, effectively improving the assembly quality of the nozzle.

[0053] The advantages of this invention are as follows:

[0054] ① This invention sets up an intelligent calibration unit for acquiring and storing optimal assembly parameters, and uses the optimal assembly parameters obtained in advance through calibration experiments to control a Cartesian coordinate robot to assemble the nozzle, thereby improving assembly speed and greatly improving assembly quality.

[0055] ② The intelligent assembly device used in this invention firmly secures the sprue plate to the workbench before assembly, and assembles the sprue nozzle by moving the pneumatic pressing device to align the nozzle mounting holes on the sprue plate. This effectively avoids the technical defects of the "Automatic Installation Machine for Sprue Plate Nozzles" published in CN110293078A, and greatly improves the assembly quality.

[0056] Glossary

[0057] Scanning speed: This refers to the time required for the visual recognition device to identify a hole on the stencil. The value of "scanning speed" in this invention actually includes the time it takes for the visual recognition device to move from the previous hole to the hole to be identified and complete the identification of the center position of the current hole, as well as the time it takes for the visual recognition device to move from the current hole to the next hole.

[0058] Assembly speed: This refers to the time required to assemble a nozzle on a stencil. In this invention, the value of "assembly speed" actually includes the time taken for the pneumatic pressing device to move from the previous hole to the hole to be assembled during the installation of the nozzle onto the stencil, and the time taken for the pneumatic pressing device to move from the current hole to the next hole.

[0059] Assembly Delay Time: In this invention, setting an "assembly delay time" is a preset measure to avoid frequent alarms during system operation, which could lead to assembly work interruptions. The pneumatic pressing device is equipped with a leak nozzle proximity switch. When the leak nozzle passes by, the proximity switch sends a signal back to the intelligent control system. Since the leak nozzle may experience delivery timeouts in the delivery pipe, if the delivery time exceeds the preset assembly delay time, the system determines it as abnormal and starts an alarm. In this invention, the delay time refers to the time threshold during leak nozzle delivery that allows for a single leak nozzle to exceed the delivery timeout limit. Attached Figure Description

[0060] Figure 1 This is a schematic diagram of the intelligent assembly device for the leak nozzle of the present invention;

[0061] Figure 2 for Figure 1 Enlarged view of point A;

[0062] Figure 3 This is a partial cross-sectional schematic diagram of the pneumatic pressing device of the present invention;

[0063] Figure 4 This is a schematic diagram of the assembled slotted plate and fixture of the present invention.

[0064] Figure 5 This is a schematic diagram of the assembly plate of the present invention;

[0065] Figure 6 This is the program logic diagram of the present invention. Detailed Implementation

[0066] like Figures 1 to 6 As shown, an intelligent nozzle assembly device includes a workbench 3. The workbench 3 is equipped with a Cartesian coordinate robot 4 for assembling nozzles and a tooling fixture 2 for fixing the nozzles. The end effector of the Cartesian coordinate robot 4 is a pneumatic pressing device 8 for pressing the nozzles. A vision recognition device 6 is disposed beside the pneumatic pressing device 8. This vision recognition device 6 is used to identify the center position of each hole on the nozzle. The vision recognition device is a high-resolution industrial camera. Specifically, the vision recognition device 6 automatically finds the center position of the hole to be installed on the nozzle as a reference point by recognizing the edge of the hole on the nozzle.

[0067] The visual recognition device 6 is electrically connected to the intelligent calibration unit set on the workbench 3, and is used to acquire and store the optimal assembly parameters of the nozzle. The intelligent calibration unit is electrically connected to the PLC controller used to control the Cartesian coordinate robot 4 to assemble the nozzle. The pneumatic pressing device 8 is connected to the vibratory feeder discharge mechanism 5 set next to the workbench 3 through a swing arm type material distribution mechanism 11 via a conveying pipe. Specifically, a material supply and installation assembly is provided on one side of the workbench 3, and the vibratory feeder discharge mechanism 5 is fixedly installed on the material supply and installation assembly.

[0068] In this invention, by combining the distribution diagram of the nozzles 12 on the sprue plate 13 and the assembly path of the nozzles during manual assembly, an algorithm and program suitable for the operation of the intelligent nozzle assembly device are compiled in the PLC controller to realize functions such as nozzle hole position recognition and nozzle assembly action, and a simple and fully functional human-machine interface 1 is established to issue instructions for the installation of nozzles and sprue plate.

[0069] The Cartesian coordinate robot 4 includes an X-axis guide rail 401, a Y-axis guide rail 403, and a Z-axis guide rail 404. The two X-axis guide rails 401 are set on the upper end of the worktable 3. The two ends of the Y-axis guide rail 403 are respectively connected to the first slider 402 on the X-axis guide rail 401. The Z-axis guide rail 404 is connected to the second slider 405 on the Y-axis guide rail 403. The Z-axis guide rail 404 is provided with a third slider 406. The third slider 406 is equipped with a pneumatic pressing device 8, a vision recognition device 10, and a swing arm type material distribution mechanism 11.

[0070] The X-axis guide rail 401, Y-axis guide rail 403, and Z-axis guide rail 404 all employ linear motors. The precision of these linear motors is 0.5 μm. Specifically, the X-axis guide rail 401, Y-axis guide rail 403, and Z-axis guide rail 404 are magnetic guide rails. By energizing coils inside the first slider 402, second slider 405, and third slider 406, a magnetic field is generated. This magnetic field interacts with the magnetic material within the magnetic guide rail, generating a driving force that propels the sliders to slide on the magnetic guide rail, thereby achieving omnidirectional movement of the end effector. This invention, by employing linear motors as a driving method to control the movement of the Cartesian coordinate robot 4, offers advantages such as quiet operation, smoothness, precision, and strong controllability.

[0071] The pneumatic pressing device 8 has a first through hole 801 and a second through hole 802, which are connected to form a Y-shaped channel. The first through hole 801 is an assembly hole perpendicular to the worktable 3. A punch 9 driven by a cylinder is clearance-fitted with the first through hole 801. The second through hole 802 is a feed hole connected to the discharge pipe of the swing-arm type dispensing mechanism 11. After the nozzle to be installed enters through the second through hole 802 and moves to the first through hole 801, the cylinder drives the punch 9 to push the nozzle out of the first through hole 801 and assemble it into the hole of the slot plate. Specifically, the cylinder is located at the upper end of the pneumatic pressing device 8.

[0072] A method for improving the assembly quality of leak nozzles using an intelligent leak nozzle assembly device includes the following steps:

[0073] 1) An intelligent calibration unit connected to a PLC controller is set in the intelligent control system of the intelligent assembly device for leak nozzles. This intelligent calibration unit is used to acquire and store the optimal assembly parameters.

[0074] 2) Fix the precious metal sprue plate on the positioning fixture of the intelligent assembly device for the sprue nozzle, and determine the optimal assembly scheme of the sprue plate and the sprue nozzle through calibration experiments.

[0075] 2-1) Determine the geometric parameters of the sprue plate and nozzle to be assembled based on empirical values. Assembly parameters The range of values ​​for;

[0076] The assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate.

[0077] The geometric parameters of the squeegee include the number of holes in the squeegee, the diameter of the holes in the squeegee, and the thickness of the squeegee. The geometric parameters of the nozzle include the outer diameter of the nozzle, the inner diameter of the nozzle, and the height of the nozzle.

[0078] 2-2) Arrange and combine the values ​​within the range of assembly parameters to form several trial assembly schemes;

[0079] In practical applications, the test step size for each assembly parameter can be set according to the specific nozzle assembly requirements. This allows for the evaluation of assembly parameters before any permutations or combinations. For example, the assembly parameters and their corresponding test step sizes are as follows:

[0080] 2-2-1) The scanning speed is 200-400 ms / hole, and the test step size of the scanning speed can be set to 50 ms / hole;

[0081] The data involved in the permutation and combination are 200, 250, 300, 350, and 400 ms / hole;

[0082] 2-2-2) The assembly speed is 200-400 ms / hole, the assembly pressure is 0.3-0.5 MPa, and the assembly delay time is 100-200 ms;

[0083] The test step size for assembly speed can be set to 50ms / hole, the test step size for assembly pressure can be set to 0.05MPa, and the test step size for assembly delay time can be set to 50ms.

[0084] 2-2-3) The initial distance between the outlet of the pneumatic press fitting device and the upper surface of the plate is 0.5 to 1 mm, and the test step of this initial distance can be set to 0.1 mm.

[0085] 2-3) Under the control of the PLC controller, the nozzle is automatically assembled onto the precious metal nozzle plate according to the several trial assembly schemes obtained in step 1-2), and the acceptance data of each trial assembly scheme is recorded and stored in the intelligent calibration unit.

[0086] 2-4) Select the best assembly scheme from several assembly acceptance data as the best assembly scheme for the leak plate and leak nozzle, and use the leak nozzle intelligent assembly device to automatically assemble according to the best assembly scheme.

[0087] 3) Based on the optimal assembly scheme obtained in step 2), the intelligent nozzle assembly device automatically assembles the nozzle onto the precious metal nozzle plate under the control of the PLC controller:

[0088] 3-1) Turn on the power of the intelligent assembly device, initialize the status of the intelligent assembly device, and return the position of the Cartesian coordinate robot to the origin.

[0089] 3-2) Select the optimal assembly parameters according to the model of the sprue plate and sprue nozzle by operating the human-machine interface;

[0090] 3-3) Clamp the sprue to be assembled onto the worktable of the intelligent assembly device, and put all the sprue nozzles to be assembled into the vibratory feeder discharge system of the intelligent assembly device.

[0091] 3-4) Activate the intelligent assembly device to assemble all the nozzles to be assembled onto the nozzle plate:

[0092] In actual production, different scanning assembly modes can be selected according to specific quality requirements, for example:

[0093] 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the sprue plate before assembling the sprue.

[0094] (1) The visual recognition device moves to the scanning position and scans the holes on the screen according to the scanning sequence (generally sequential scanning, that is, scanning a row of holes along the Y-axis, then moving one hole position along the X-axis, and then scanning in the opposite direction along the Y-axis, and repeating this until all holes on the screen are scanned). The device obtains the coordinates of the current hole position and the distance to the next hole position in sequence, and feeds the data back to the control system. At the same time, the vibratory feeder feeding system delivers qualified nozzles to the swing arm feeding mechanism.

[0095] (2) Based on the feedback data obtained in step (1), the control system controls the pneumatic pressing device to run to the hole to be assembled.

[0096] (3) The swing arm type material distribution mechanism delivers the nozzle to the through hole of the pneumatic pressing device according to the set assembly parameters, so that the punch in the pneumatic pressing device presses the nozzle into the hole of the nozzle plate to complete the assembly.

[0097] (4) Repeat steps (2) to (3) above to complete the installation of the nozzles at each hole on the squeegee plate in sequence;

[0098] 3-4-2) Local scanning mode:

[0099] ① The intelligent assembly device obtains the center position of a hole on the sprue by scanning, and then assembles the sprue according to the center position of the hole;

[0100] ② Repeat step ① until all the nozzles corresponding to the holes of the squeegee are assembled;

[0101] Based on the above-described method for improving the assembly quality of the leak nozzle and the intelligent assembly device, Examples 1, 2, and 3 are as follows:

[0102] Example 1: A leak plate with 400 holes for leak nozzle mounting is used for assembly. The leak plate is 2.0 mm thick, the diameter of the holes for leak nozzle mounting is 2.7 mm, the outer diameter of each leak nozzle is 2.7 mm, the inner diameter is 1.8 mm, and the height is 6.5 mm.

[0103] Example 2: A leak plate with 800 holes for mounting the leak nozzles is used for assembly. The leak plate is 1.8 mm thick, the diameter of the holes for mounting the leak nozzles is 2.6 mm, the outer diameter of each leak nozzle is 2.6 mm, the inner diameter is 1.8 mm, and the height is 6.0 mm.

[0104] Example 3: A leak plate with 1200 holes for leak nozzle mounting is used for assembly. The leak plate is 1.6 mm thick, the diameter of the holes for leak nozzle mounting is 2.6 mm, the outer diameter of each leak nozzle is 2.6 mm, the inner diameter is 1.7 mm, and the height is 6.5 mm.

[0105] I. The optimal assembly parameter ranges for assembling the sprue plates and nozzles of each embodiment using the intelligent assembly device were determined through calibration experiments as follows:

[0106] (1) The scanning speed is 200–400 ms / well;

[0107] (2) The assembly speed is 200-400 ms / hole, the assembly pressure is 0.3-0.5 MPa, and the assembly delay time is 100-200 ms;

[0108] (3) The initial distance between the outlet of the pneumatic press fitting device and the upper surface of the press plate is 0.5 to 1 mm.

[0109] Second, the values ​​within the above assembly parameter range are arranged and combined to form several leak nozzle assembly schemes. Using an intelligent assembly device, leak nozzles are assembled on the precious metal leak plate according to the parameter values ​​corresponding to all leak nozzle assembly schemes. Assembly acceptance data for each leak nozzle assembly scheme is recorded and stored. Finally, the leak nozzle assembly scheme with the best assembly quality is selected from the several assembly acceptance data sets. The parameter values ​​corresponding to this leak nozzle assembly scheme are used as the optimal assembly parameters for the leak plate and leak nozzles in Examples 1, 2, and 3, as detailed below:

[0110] Example 1: The scanning speed is 400 ms / hole, the assembly speed is 350 ms / hole, the assembly delay time is 200 ms, the assembly pressure is 0.5 MPa, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate is 0.8 mm.

[0111] Example 2: The scanning speed is 300 ms / hole, the assembly speed is 300 ms / hole, the assembly delay time is 150 ms, the assembly pressure is 0.45 MPa, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate is 0.9 mm.

[0112] Example 3: The scanning speed is 200 ms / hole, the assembly speed is 300 ms / hole, the assembly delay time is 100 ms, the assembly pressure is 0.4 MPa, and the initial distance between the outlet of the pneumatic press fitting device nozzle and the upper surface of the nozzle plate is 1.0 mm.

[0113] The quality of the assembled sprue plates and nozzles in the three embodiments described above was tested. It was found that because errors caused by factors affecting assembly quality were minimized during the assembly process, the assembly quality of the sprue plates and nozzles was extremely high and met the requirements. No nozzle cracking occurred due to misalignment, and no gaps were found between the nozzles and sprue plates due to incorrect nozzle assembly height or angle deviations. Therefore, this invention can be used for assembling sprue plates and nozzles of different models, maximizing assembly quality while ensuring the efficiency of automated assembly.

[0114] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method of improving the quality of a spout assembly, characterized by, The method comprises the following steps: 1) setting an intelligent calibration unit connected with a PLC controller in an intelligent control system of a nozzle intelligent assembly device, the intelligent calibration unit being used for acquiring and storing optimal assembly parameters; 2) fixing a precious metal nozzle plate on a positioning clamp of the nozzle intelligent assembly device, and determining an optimal assembly scheme of the nozzle plate and the nozzle through calibration experiments; The calibration experiments comprise the following steps: 2-1) determining a value range of assembly parameters according to empirical values based on geometric parameters of the nozzle plate and the nozzle to be assembled; The geometric parameters of the nozzle plate include the number of holes, the hole diameter and the thickness of the nozzle plate, and the geometric parameters of the nozzle include the outer diameter, the inner diameter and the height of the nozzle; The assembly parameters include a scanning speed, an assembly speed, an assembly pressure, an assembly delay time and an initial distance between an outlet of a pneumatic press-fitting device and an upper surface of the nozzle plate; 2-2) arranging and combining values in the value range of the assembly parameters to form a plurality of trial assembly schemes; 2-3) automatically assembling the nozzle on the precious metal nozzle plate according to the plurality of trial assembly schemes obtained in step 2-2) under the control of the PLC controller, and recording and storing acceptance data of each trial assembly scheme in the intelligent calibration unit; 2-4) selecting a trial assembly scheme with the best assembly quality from the plurality of assembly acceptance data as an optimal assembly scheme of the nozzle plate and the nozzle, and using the optimal assembly scheme for automatic assembly of the nozzle intelligent assembly device; 3) automatically assembling the nozzle on the precious metal nozzle plate by the nozzle intelligent assembly device under the control of the PLC controller according to the optimal assembly scheme obtained in step 2), and the specific steps comprise: 3-1) turning on the power supply of the intelligent assembly device, initializing the state of the intelligent assembly device, and returning the position of the Cartesian robot to the original point; 3-2) selecting corresponding optimal assembly parameters according to the model of the nozzle plate and the nozzle through the operation of the man-machine interface; 3-3) clamping the nozzle plate to be assembled on the workbench of the intelligent assembly device, and putting all the nozzles to be assembled into the vibration disc feeding system of the intelligent assembly device; 3-4) starting the intelligent assembly device to assemble all the nozzles to be assembled on the nozzle plate, wherein the intelligent assembly device assembles all the nozzles to be assembled on the nozzle plate in two modes: 3-4-1) integral scanning mode: the intelligent assembly device scans and stores all the hole positions on the nozzle plate first, and then assembles the nozzles; 3-4-2) local scanning mode: ① the intelligent assembly device acquires the center position of a hole on the nozzle plate through scanning, and then assembles the nozzle according to the center position of the hole; ② repeating step ① until all the nozzles corresponding to the hole positions on the nozzle plate are assembled.

2. A smart nozzle assembly for use in the method of claim 1, wherein, The application relates to a device for assembling a tube sheet, which comprises a workbench (3), a straight coordinate robot (4) for assembling a tube sheet and a tool clamp (2) for fixing the tube sheet arranged on the workbench (3), an end effector of the straight coordinate robot (4) is a pneumatic pressing device (8) for pressing a tube mouth, a visual identification device (6) is arranged beside the pneumatic pressing device (8), the visual identification device (6) is used for identifying the center position of each hole position on the tube sheet, the visual identification device (6) is electrically connected with an intelligent calibration unit arranged on the workbench (3), is used for acquiring and storing optimal assembling parameters of the tube sheet, the intelligent calibration unit is electrically connected with a PLC controller used for controlling the straight coordinate robot (4) to assemble the tube mouth, and the pneumatic pressing device (8) is connected with a vibrating disc material discharging mechanism (5) arranged beside the workbench (3) through a swing lever type material distributing mechanism (11) and a conveying pipe.

3. The smart assembly device of claim 2, wherein, The straight coordinate robot (4) comprises X-axis guide rails (401), Y-axis guide rails (403) and Z-axis guide rails (404), two X-axis guide rails (401) are arranged on the upper end of the workbench (3), two ends of the Y-axis guide rails (403) are respectively connected with first sliding blocks (402) on the X-axis guide rails (401), the Z-axis guide rails (404) are connected with second sliding blocks (405) on the Y-axis guide rails (403), the Z-axis guide rails (404) are provided with third sliding blocks (406), the pneumatic pressing device (8), the visual identification device (6) and the swing lever type material distributing mechanism (11) are installed on the third sliding blocks (406).

4. The smart assembly device of claim 3, wherein, The X-axis guide rails (401), the Y-axis guide rails (403) and the Z-axis guide rails (404) are all linear motors.

5. The smart assembly device of claim 2, wherein, The pneumatic pressing device (8) is internally provided with a first through hole (801) and a second through hole (802), the first through hole (801) and the second through hole (802) are connected to form a Y-shaped channel, wherein the first through hole (801) is an assembling hole which is perpendicular to the surface of the workbench (3), a punch pin (9) driven by a cylinder is in gap cooperation with the first through hole (801), the second through hole (802) is a feeding hole connected with a discharging pipe of the swing lever type material distributing mechanism (11), after a to-be-assembled tube mouth is moved from the second through hole (802) to the first through hole (801), the punch pin (9) driven by the cylinder pushes the to-be-assembled tube mouth out of the first through hole (801) and assembles the tube mouth to the hole position of the tube sheet.

Images