Method for improving discharge spout assembly quality and intelligent discharge spout assembly device

Abstract

The invention relates to the field of precious metal product processing, in particular to an intelligent discharge spout assembling device capable of improving the discharge spout assembling quality, and an intelligent control system of the intelligent discharge spout assembling device comprises an intelligent calibration unit used for storing optimal assembling parameters and a PLC used for controlling a rectangular coordinate robot to perform discharge spout assembling. During assembly, the precious metal bushing is fixed on a positioning clamp of the intelligent discharge spout assembly device, and the optimal assembly scheme of the bushing and the discharge spout is determined through a calibration experiment; and according to the obtained optimal assembly scheme, the discharge spout is automatically assembled on the precious metal bushing plate by the discharge spout intelligent assembly device under the control of the PLC. According to the method, the optimal assembling parameters obtained through the calibration experiment in advance are adopted, the Cartesian coordinate robot is controlled to assemble the discharge spout, and the assembling quality is greatly improved while the assembling speed is increased.

Description

Technical Field

[0001] The invention relates to the field of precious metal product processing, and in particular to a method for improving the assembly quality of a nozzle and an intelligent nozzle assembly device. Background Art

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

[0003] In the production of precious metal leak plates, if the assembly of the leak nozzle and the leak plate is completed manually, the following problems will occur: ① The assembly ability of workers is relatively high: Due to the differences in skill levels, work experience and operating habits of different operators, the assembly quality will be uneven. Experienced operators may assemble well, while novices may not be able to accurately grasp the installation force when installing the nozzle due to lack of familiarity. Excessive force may damage the nozzle or the nozzle plate, while too little force may cause the nozzle to not be installed properly; ② Assembly speed is limited: The installation of each nozzle requires manual positioning, insertion, adjustment and other steps, and long assembly work will cause fatigue to the operator, resulting in a further decrease in assembly speed. In large-scale production, if there are a large number of nozzles on the plate that need to be assembled, manual assembly will take a lot of time, thus affecting the progress of the entire production.

[0004] Moreover, as the production intensity increases, the fatigue of operators will continue to increase, causing operators to be unable to maintain their initial good working conditions, resulting in a continuous decline in assembly speed and even assembly quality; In order to avoid the defects caused by manual assembly, the "Automatic Installation Machine for Wire Drawing Leakage Plate and Leakage Nozzle" with publication number CN110293078A discloses a device for installing a leakage plate and a leakage nozzle. Although this device can improve the assembly efficiency of the leakage plate and the leakage nozzle to a certain extent and avoid the defects of manual assembly. However, it does not take into account the problem of how to improve the assembly quality, and ignores many factors that can affect the assembly quality during the assembly process. For example, the "Automatic Installation Machine for Wire Drawing Leakage Plate and Leakage Nozzle" with publication number CN110293078A completes the assembly by moving the holes on the leakage plate to the bottom of the press-fitting mechanism. During the assembly process, there may be problems with the clamping of the leakage plate. As the use time increases, the fastening force between the moving table and the guide rail used to install the leakage plate will decrease. The leakage plate is prone to positional displacement during the movement, resulting in assembly errors, thereby affecting the assembly quality of the leakage nozzle. Ultimately, these errors are added up during the assembly process, which will eventually cause the overall assembly quality of the precious metal leak plate to fail to meet the requirements (for example, the installation position of the leak nozzle is offset, causing the leak nozzle to crack, or the leak nozzle assembly height does not meet the requirements, or even the leak nozzle assembly angle deviates, resulting in a gap between the assembled leak nozzle and the leak plate, and poor sealing).

[0005] Once the assembly is completed, if the assembly quality of the nozzle is found to be unqualified during the acceptance process, it can only be reworked, which is time-consuming and laborious. Therefore, how to improve the assembly speed and further improve the assembly quality during the assembly of the nozzle on the precious metal nozzle plate has always been a problem that technicians in this field need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a method for improving the assembly quality of a nozzle and an intelligent assembly device for a nozzle, in view of the corresponding deficiencies in the prior art. By setting an intelligent calibration unit for storing optimal assembly parameters, the optimal assembly parameters obtained in advance through a calibration experiment are used to control a rectangular coordinate robot to assemble the nozzle, thereby greatly improving the assembly quality while increasing the assembly speed.

[0007] The objective of the present invention is achieved by adopting the following scheme: A device for intelligently assembling a leak nozzle for improving the assembly quality of the leak nozzle comprises a workbench, on which a rectangular coordinate robot for assembling a leak plate and a fixture for fixing the leak plate are arranged, the end effector of the rectangular coordinate robot is a pneumatic pressing device for pressing the leak nozzle, a visual recognition device is arranged beside the pneumatic pressing device, the visual recognition device is used to identify the center position of each hole on the leak plate, the visual recognition device is electrically connected to an intelligent calibration unit arranged on the workbench, and is used to obtain and store optimal assembly parameters of the leak plate, the intelligent calibration unit is electrically connected to a PLC controller for controlling the rectangular coordinate robot to assemble the leak nozzle, and the pneumatic pressing device is connected to a vibration plate discharging mechanism arranged beside the workbench through a rocker-type material distribution mechanism and a conveying pipe.

[0008] Preferably, the rectangular 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 arranged at the upper end of the workbench, 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, and the third slider is installed with a pneumatic pressing device, a visual recognition device, and a rocker-type material dividing mechanism.

[0009] Preferably, the X-axis guide rail, the Y-axis guide rail and the Z-axis guide rail all use linear motors.

[0010] Preferably, the pneumatic pressing device is provided with a first through hole and a second through hole, the first through hole and the second through hole are connected to form a Y-shaped channel, wherein the first through hole is an assembly hole perpendicular to the work surface, a punch driven by a cylinder is loosely matched with the first through hole, and the second through hole is a feed hole connected to a discharge pipe of a rocker-type material distributing mechanism, after the drain nozzle to be installed moves from the second through hole to the first through hole, the cylinder drives the punch to push the installed drain nozzle out of the first through hole and assemble it to the hole position of the drain plate.

[0011] The method for improving the assembly quality of a nozzle by using the above-mentioned nozzle intelligent assembly device comprises the following steps: 1) An intelligent calibration unit connected to a PLC controller is provided in the intelligent control system of the nozzle intelligent assembly device, and the intelligent calibration unit is used to obtain and store optimal assembly parameters; 2) Fix the precious metal leak plate on the positioning fixture of the leak nozzle intelligent assembly device, and determine the best assembly scheme of the leak plate and the leak nozzle through calibration experiments; 3) According to the best assembly solution obtained in step 2), the nozzle is automatically assembled on the precious metal nozzle plate by the nozzle intelligent assembly device under the control of the PLC controller.

[0012] Preferably, in step 2), the calibration experiment comprises the following steps: 2-1) According to the geometric parameters of the leak plate and leak nozzle to be assembled, determine the value range of the assembly parameters according to empirical values; 2-2) Arrange and combine the values ​​within the range of assembly parameters to form several trial assembly plans; 2-3) Under the control of the PLC controller, the nozzle is automatically assembled on the precious metal drain 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; 2-4) Selecting a trial assembly plan with the best assembly quality from a number of assembly acceptance data as the best assembly plan for the leak plate and the leak nozzle, and using the leak nozzle intelligent assembly device to automatically assemble according to the best assembly plan.

[0013] Preferably, the assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and an initial distance between a nozzle outlet of a pneumatic press-fit device and an upper surface of the leak plate.

[0014] Preferably, the geometric parameters of the leak plate include the number of leak plate holes, the leak plate hole diameter, and the leak plate thickness, and the geometric parameters of the leak nozzle include the leak nozzle outer diameter, the leak nozzle inner diameter, and the leak nozzle height.

[0015] Preferably, in step 3), the step of automatically assembling the nozzle on the precious metal drain plate by the nozzle intelligent assembly device under the control of the PLC controller includes: 3-1) Turn on the power of the intelligent assembly device, initialize the state of the intelligent assembly device, and return the position of the rectangular coordinate robot to the origin; 3-2) Select the corresponding optimal assembly parameters according to the models of the drain plate and drain nozzle by operating the human-machine interface; 3-3) Clamp the drain plate to be assembled on the workbench of the intelligent assembly device, and place all the drain nozzles to be assembled into the vibrating plate discharge system of the intelligent assembly device; 3-4) Start the intelligent assembly device and assemble all the drain nozzles to be assembled onto the drain plate.

[0016] Preferably, the intelligent assembly device includes two modes when assembling all the nozzles to be assembled onto the drain plate: 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the drain plate, and then assembles the drain nozzle; 3-4-2) Local scanning mode: ①The intelligent assembly device obtains the center position of a hole on the drain plate by scanning, and then assembles the drain nozzle according to the center position of the hole; ② Repeat step ① until all the nozzles corresponding to the holes of the leak plate are assembled.

[0017] The beneficial effects of the present invention are as follows: The intelligent control system comprises an intelligent calibration unit for acquiring and storing optimal assembly parameters, and a PLC controller for controlling a rectangular coordinate robot (4) to assemble the nozzle, wherein the PLC controller is connected to the intelligent calibration unit so that the PLC controller can assemble the nozzle according to the optimal assembly parameters stored in the intelligent calibration unit; The present invention is provided with an intelligent calibration unit for storing optimal assembly parameters, and uses the optimal assembly parameters obtained in advance through calibration experiments to control a rectangular coordinate robot to perform nozzle assembly, thereby greatly improving assembly quality while increasing assembly speed.

[0018] Preferably, the assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and an initial distance between a nozzle outlet of a pneumatic press-fit device and an upper surface of the leak plate.

[0019] The present invention finds out the types of various parameters that affect the assembly quality of the nozzle during the nozzle assembly process through experiments, and determines the specific values ​​corresponding to different nozzles and nozzle plates through calibration experiments as guiding data for the assembly process, thereby greatly improving the assembly quality.

[0020] Preferably, in step 3-4), the intelligent assembly device includes two modes when assembling all the nozzles to be assembled on the drain plate: 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the drain plate, and then assembles the drain nozzle; The overall scanning mode is to perform an overall scan on all the nozzle mounting holes on the entire precious metal leak plate. This method can obtain the overall information of the leak plate and the nozzle mounting holes, including their relative positions, size deviations, etc., and can better take into account the mutual influence between the leak plate and the nozzle mounting holes. By scanning to obtain the flatness information of the leak plate surface and the coordinates of each nozzle mounting hole, during the assembly process, the assembly position of each nozzle can be accurately controlled from a macro perspective, and the position of the nozzle can be adjusted according to this complete information, so that each nozzle can be more accurately installed in the ideal position. In the precious metal leak assembly process of the present invention, which has extremely high requirements for assembly quality, it can effectively reduce product quality problems caused by position deviation.

[0021] Although the preliminary scanning work of the overall scanning mode may be relatively complicated, the assembly path and sequence of all nozzles can be planned at one time through the optimization algorithm during the actual assembly process. For example, in an automated assembly production line, the data obtained from all scans can be used to provide a complete assembly strategy for the robot assembly system. The robot can complete the assembly of all nozzles in sequence according to the pre-planned path and action sequence, reducing the adjustment and waiting time during the assembly process and improving the assembly efficiency as a whole. Moreover, this solution can detect possible assembly conflicts or problems in advance, avoiding rework caused by frequent problems during the assembly process.

[0022] Even the overall scanning mode can provide a complete pre-assembly data benchmark. After the assembly is completed, the actual data after assembly can be compared with the scanned data before assembly by performing a full scan again to comprehensively detect the assembly quality. For example, in the assembly of precious metal leak plates and leak nozzles, by comparing the scanned data before and after, it is possible to detect multiple quality indicators such as whether the installation angle of each leak nozzle meets the requirements, whether the connection between the leak nozzle and the leak plate is tight, etc., which can timely discover quality risks and accurately locate the location of the problem, facilitating targeted repairs or adjustments (such as the adjustment and correction of the specific values ​​of the assembly parameters in the present invention).

[0023] 3-4-2) Local scanning mode: ①The intelligent assembly device obtains the center position of a hole on the drain plate by scanning, and then assembles the drain nozzle according to the center position of the hole; ② Repeat step ① until all the nozzles corresponding to the holes of the leak plate are assembled.

[0024] The local scanning mode is to scan only one nozzle and its corresponding leak plate installation position at a time. This method focuses more on the individual in quality control. For some single leaks with irregular shapes or special installation requirements, their characteristic information can be obtained more carefully through separate scanning. For example, in the leak plate assembly of some precious metal experimental devices, a certain nozzle may have a special internal structure or size. Separate scanning can focus on the details of this nozzle to ensure the assembly quality of the nozzle.

[0025] Preferably, the pneumatic pressing device is provided with a first through hole and a second through hole, the first through hole and the second through hole are connected to form a Y-shaped channel, wherein the first through hole is an assembly hole perpendicular to the work surface, a punch driven by a cylinder is loosely matched with the first through hole, and the second through hole is a feed hole connected to a discharge pipe of a rocker-type material distributing mechanism, after the drain nozzle to be installed moves from the second through hole to the first through hole, the cylinder drives the punch to push the installed drain nozzle out of the first through hole and assemble it to the hole position of the drain plate.

[0026] The present invention adopts a pneumatic pressing device, a punching needle pushes the drain nozzle out of the first through hole, and aligns the first through hole with the hole position of the drain plate to be assembled, thereby effectively improving the assembly quality of the drain nozzle.

[0027] The advantages of the present invention are as follows: ① The present invention provides an intelligent calibration unit for acquiring and storing optimal assembly parameters, adopts the optimal assembly parameters obtained in advance through calibration experiments, and controls the rectangular coordinate robot to perform nozzle assembly, thereby greatly improving the assembly quality while increasing the assembly speed; ② The intelligent assembly device adopted in the present invention can firmly fasten the leak plate on the workbench before assembly, and assemble the leak nozzle only by moving the pneumatic pressing device to align the leak nozzle mounting hole on the leak plate during the assembly process, thereby effectively avoiding the technical defects of "A drawing leak plate leak nozzle automatic installation machine" with publication number CN110293078A, and greatly improving the assembly quality. Glossary

[0028] Scanning speed: It is used to indicate the time required for the visual recognition device to identify a hole position on the leak plate. The value of "scanning speed" in the present invention actually includes the time taken by the visual recognition device to complete the recognition of the center position of the current hole position after moving from the previous hole position to the hole position to be identified, and the time taken by the visual recognition device to move from the current hole position to the next hole position; Assembly speed: It is used to indicate the time required to assemble a nozzle on the leak plate. The value of "assembly speed" in the present invention actually includes the time taken by the pneumatic pressing device to move from the previous hole position to the hole position to be assembled to complete the press-fitting of the nozzle at the current hole position, and the time taken by the pneumatic pressing device to move from the current hole position to the next hole position during the process of installing the nozzle on the leak plate; Assembly delay time: In the present invention, setting the "assembly delay time" is a preset means to avoid frequent alarms during system operation, which may cause interruptions in assembly work. A nozzle proximity switch is provided in the pneumatic pressing device. When the nozzle passes by, the proximity switch feeds back a signal to the intelligent control system. Since the nozzle may be transported overtime in the conveying pipe, when the nozzle delivery time exceeds the preset assembly delay time, the system determines it as abnormal and starts to alarm. In the present invention, it refers to the time threshold that allows a single nozzle to be transported overtime during the nozzle delivery process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of the intelligent assembly device of the nozzle of the present invention; Figure 2 for Figure 1 A magnified image of point A; Figure 3 It is a partial cross-sectional schematic diagram of the pneumatic press-fitting device of the present invention; Figure 4 is a schematic diagram of the bushing and the fixture after assembly of the present invention; Figure 5 It is a schematic diagram of the bushing to be assembled according to the present invention; Figure 6 It is the program logic diagram of the present invention. DETAILED DESCRIPTION

[0030] like Figures 1 to 6 As shown, a drain nozzle intelligent assembly device includes a workbench 3, on which a rectangular coordinate robot 4 for assembling a drain plate and a fixture 2 for fixing the drain plate are arranged, the end effector of the rectangular coordinate robot 4 is a pneumatic pressing device 8 for pressing the drain nozzle, and a visual recognition device 6 is arranged next to the pneumatic pressing device 8, and the visual recognition device 6 is used to identify the center position of each hole on the drain plate, and the visual recognition device is a high-pixel industrial camera. Specifically, the visual recognition device 6 automatically finds the center position of the hole as the base point by identifying the edge of the hole to be installed on the drain plate.

[0031] The visual recognition device 6 is electrically connected to the intelligent calibration unit provided on the workbench 3, and is used to obtain and store the optimal assembly parameters of the leak plate. The intelligent calibration unit is electrically connected to the PLC controller used to control the rectangular coordinate robot 4 to assemble the leak nozzle. The pneumatic pressing device 8 is connected to the vibration plate discharging mechanism 5 provided next to the workbench 3 through a rocker-type material distribution mechanism 11 through a conveying pipe. Specifically, a feeding installation assembly is provided on one side of the workbench 3, and the vibration plate discharging mechanism 5 is fixedly installed on the feeding installation assembly.

[0032] In the present invention, by combining the distribution diagram of the leak nozzles 12 on the leak plate 13 and the path of assembling the leak nozzles during manual assembly, an algorithm and program suitable for the operation of the leak nozzle intelligent assembly device are compiled in the PLC controller to realize the functions of leak nozzle hole position recognition, leak nozzle assembly action, etc., and a simple-to-operate and fully functional human-machine interface 1 is established to issue instructions for the installation of the leak nozzles and the leak plate.

[0033] The rectangular 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 arranged at the upper end of the workbench 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, and 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, and the third slider 406 is installed with a pneumatic pressing device 8, a visual recognition device 10, and a rocker-type material distribution mechanism 11.

[0034] The X-axis guide rail 401, the Y-axis guide rail 403 and the Z-axis guide rail 404 all use linear motors. The accuracy of the linear motor is 0.5μm. Specifically, the X-axis guide rail 401, the Y-axis guide rail 403 and the Z-axis guide rail 404 are magnetic guide rails, and coils are energized inside the first slider 402, the second slider 405 and the third slider 406 to generate a magnetic field, which interacts with the magnetic material in the magnetic guide rail to generate a driving force, pushing the slider to slide on the magnetic guide rail, thereby realizing the omnidirectional movement of the end effector. The present invention uses a linear motor as a driving method to control the movement of the rectangular coordinate robot 4, which has the advantages of being quiet, stable, precise, and highly controllable.

[0035] The pneumatic pressing device 8 is provided with a first through hole 801 and a second through hole 802, which are connected to form a Y-shaped channel, wherein the first through hole 801 is an assembly hole perpendicular to the three surfaces of the workbench, a punching needle 9 driven by a cylinder is in clearance fit with the first through hole 801, and the second through hole 802 is a feed hole connected to the discharge pipe of the rocker-type material distribution mechanism 11, after the drain nozzle to be installed moves from the second through hole 802 to the first through hole 801, the cylinder drives the punching needle 9 to push the installed drain nozzle out of the first through hole 801 and assemble it to the hole position of the drain plate. Specifically, the cylinder is arranged at the upper end of the pneumatic pressing device 8.

[0036] The method for improving the assembly quality of a nozzle by using a nozzle intelligent assembly device comprises the following steps: 1) An intelligent calibration unit connected to a PLC controller is provided in the intelligent control system of the nozzle intelligent assembly device, and the intelligent calibration unit is used to obtain and store optimal assembly parameters; 2) Fix the precious metal leak plate on the positioning fixture of the leak nozzle intelligent assembly device, and determine the best assembly scheme of the leak plate and the leak nozzle through calibration experiments; 2-1) Determine according to the geometric parameters of the drain plate and drain nozzle to be assembled according to the empirical value Assembly parameters The value range of The assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and an initial distance between the nozzle outlet of the pneumatic press-fit device and the upper surface of the leak plate.

[0037] The geometric parameters of the leak plate include the number of leak plate holes, the leak plate hole diameter, and the leak plate thickness. The geometric parameters of the leak nozzle include the leak nozzle outer diameter, the leak nozzle inner diameter, and the leak nozzle height.

[0038] 2-2) Arrange and combine the values ​​within the range of assembly parameters to form several trial assembly plans; In actual application, the test step length corresponding to each assembly parameter can be set according to the specific nozzle assembly requirements, so as to obtain the value of the assembly parameter before the permutation and combination. For example, the assembly parameters and the corresponding test step lengths are as follows: 2-2-1) The scanning speed is 200-400ms / hole, and the test step of the scanning speed can be set to 50ms / hole; Then the data involved in the permutation and combination are 200, 250, 300, 350, 400ms / hole; 2-2-2) The assembly speed is 200-400ms / hole, the assembly pressure is 0.3-0.5Mpa, and the assembly delay time is 100-200ms; Then the test step length of assembly speed can be set to 50ms / hole, the test step length of assembly pressure can be set to 0.05Mpa, and the test step length of assembly delay time can be set to 50ms; 2-2-3) The initial distance between the nozzle outlet of the pneumatic press-fit device and the upper surface of the leak plate is 0.5 to 1 mm, and the test step length of the initial distance can be set to 0.1 mm.

[0039] 2-3) Under the control of the PLC controller, the nozzle is automatically assembled on the precious metal drain 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; 2-4) Selecting a trial assembly plan with the best assembly quality from a number of assembly acceptance data as the best assembly plan for the leak plate and the leak nozzle, and using the leak nozzle intelligent assembly device to automatically assemble according to the best assembly plan.

[0040] 3) According to the best assembly scheme obtained in step 2), the nozzle is automatically assembled on the precious metal drain plate by the nozzle intelligent assembly device under the control of the PLC controller: 3-1) Turn on the power of the intelligent assembly device, initialize the state of the intelligent assembly device, and return the position of the rectangular coordinate robot to the origin; 3-2) Select the corresponding optimal assembly parameters according to the models of the drain plate and drain nozzle by operating the human-machine interface; 3-3) Clamp the drain plate to be assembled on the workbench of the intelligent assembly device, and place all the drain nozzles to be assembled into the vibrating plate discharge system of the intelligent assembly device; 3-4) Start the intelligent assembly device and assemble all the nozzles to be assembled onto the drain plate: In the actual production process, different scanning assembly modes can be selected according to specific quality requirements, such as: 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the drain plate, and then assembles the drain nozzle; ⑴ The visual recognition device moves to the scanning position and scans the holes on the leak plate in the scanning order (generally sequential scanning, that is, scanning a row of holes completely along the Y-axis direction, then moving a hole position along the X-axis, and then scanning in the opposite direction along the Y-axis, and repeating this process until all the holes on the leak plate are scanned), and obtains the current hole position coordinates and the distance to the next hole position in turn, and feeds the data back to the control system. At the same time, the vibration plate discharge system transports the qualified leak nozzles to the swing rod type material distribution mechanism; ⑵ According to the feedback data obtained in step ⑴, the control system controls the pneumatic pressing device to run to the hole position to be assembled; ⑶ The swing-rod type material distribution mechanism transports 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 leak plate to complete the assembly; (4) Repeat the above steps (2) to (3) to install the nozzles of each hole on the drain plate in sequence; 3-4-2) Local scanning mode: ① The intelligent assembly device obtains the center position of a hole on the leak plate by scanning, and then assembles the leak nozzle according to the center position of the hole; ② Repeat step ① until all the nozzles corresponding to the holes of the leak plate are assembled; According to the above method for improving the assembly quality of the nozzle and the intelligent assembly device, Examples 1, 2, and 3 are as follows: Embodiment 1: A leak plate with 400 leak nozzle mounting holes is used for assembly. The leak plate thickness is 2.0 mm, the leak nozzle mounting hole diameter is 2.7 mm, and each leak nozzle has an outer diameter of 2.7 mm, an inner diameter of 1.8 mm, and a height of 6.5 mm.

[0041] Embodiment 2: A leak plate with 800 nozzle mounting holes is used for assembly. The leak plate thickness is 1.8 mm, the nozzle mounting hole diameter is 2.6 mm, and each nozzle has an outer diameter of 2.6 mm, an inner diameter of 1.8 mm, and a height of 6.0 mm.

[0042] Embodiment 3: A leak plate with 1200 leak nozzle mounting holes is used for assembly. The leak plate thickness is 1.6 mm, the leak nozzle mounting hole diameter is 2.6 mm, and each leak nozzle has an outer diameter of 2.6 mm, an inner diameter of 1.7 mm, and a height of 6.5 mm.

[0043] 1. The range of values ​​of the best assembly parameters when assembling the drain plate and drain nozzle of each embodiment using the intelligent assembly device is determined through calibration experiments as follows: ⑴ The scanning speed is 200-400ms / hole; ⑵ The assembly speed is 200-400ms / hole, the assembly pressure is 0.3-0.5Mpa, and the assembly delay time is 100-200ms; ⑶ The initial distance between the nozzle outlet of the pneumatic pressing device and the upper surface of the leak plate is 0.5-1mm.

[0044] Second, the values ​​within the above-mentioned assembly parameter value range are arranged and combined to form several nozzle assembly schemes, and the nozzles are assembled on the precious metal leak plate using the intelligent assembly device according to the parameter values ​​corresponding to all the nozzle assembly schemes, and the assembly acceptance data corresponding to each nozzle assembly scheme is recorded and stored; finally, the nozzle assembly scheme with the best assembly quality is selected from the several assembly acceptance data, and the parameter values ​​corresponding to the nozzle assembly scheme are used as the optimal assembly parameters of the leak plate and the nozzle of Examples 1, 2, and 3, as follows: 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 nozzle outlet of the pneumatic press-fit device and the upper surface of the leak plate is 0.8 mm.

[0045] 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 nozzle outlet of the pneumatic press-fitting device and the upper surface of the leak plate is 0.9 mm.

[0046] 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 nozzle outlet of the pneumatic press-fitting device and the upper surface of the leak plate is 1.0 mm.

[0047] The quality of the leak plate and the leak nozzle after assembly in the above three embodiments is tested, and it is found that since the error caused by the factors affecting the assembly quality is minimized as much as possible during the assembly process, the assembly quality of the leak plate and the leak nozzle is extremely high and meets the requirements. There is no cracking of the leak nozzle caused by the displacement of the installation position of the leak nozzle, and there is no gap between the leak nozzle and the leak plate due to the leak nozzle assembly height not meeting the requirements or the leak nozzle assembly angle deviation. It can be seen that the present invention can be used for the assembly of leak plates and leak nozzles of different models, and while ensuring the working efficiency of the automated assembly, the assembly quality is improved to the maximum extent.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification 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 for improving the assembly quality of a nozzle, characterized in that: The following steps are involved: 1) An intelligent calibration unit connected to a PLC controller is provided in the intelligent control system of the nozzle intelligent assembly device, and the intelligent calibration unit is used to obtain and store optimal assembly parameters; 2) Fix the precious metal leak plate on the positioning fixture of the leak nozzle intelligent assembly device, and determine the best assembly scheme of the leak plate and the leak nozzle through calibration experiments; 3) According to the best assembly solution obtained in step 2), the nozzle is automatically assembled on the precious metal nozzle plate by the nozzle intelligent assembly device under the control of the PLC controller.

2. The method for improving the assembly quality of the nozzle according to claim 1, characterized in that: In step 2), the calibration experiment includes the following steps: 2-1) According to the geometric parameters of the leak plate and leak nozzle to be assembled, determine the value range of the assembly parameters according to empirical values; 2-2) Arrange and combine the values ​​within the range of assembly parameters to form several trial assembly plans; 2-3) Under the control of the PLC controller, the nozzle is automatically assembled on the precious metal drain 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; 2-4) Selecting a trial assembly plan with the best assembly quality from a number of assembly acceptance data as the best assembly plan for the leak plate and the leak nozzle, and using the leak nozzle intelligent assembly device to automatically assemble according to the best assembly plan.

3. The method for improving the assembly quality of the nozzle according to claim 2, characterized in that: The assembly parameters include scanning speed, assembly speed, assembly pressure, assembly delay time, and an initial distance between the nozzle outlet of the pneumatic press-fit device and the upper surface of the leak plate.

4. The method for improving the assembly quality of the nozzle according to claim 2, characterized in that: The geometric parameters of the leak plate include the number of leak plate holes, the leak plate hole diameter, and the leak plate thickness. The geometric parameters of the leak nozzle include the leak nozzle outer diameter, the leak nozzle inner diameter, and the leak nozzle height.

5. The method for improving nozzle assembly quality according to claim 1, characterized in that: In step 3), the step of automatically assembling the nozzle on the precious metal nozzle plate by the nozzle intelligent assembly device under the control of the PLC controller includes: 3-1) Turn on the power of the intelligent assembly device, initialize the state of the intelligent assembly device, and return the position of the rectangular coordinate robot to the origin; 3-2) Select the corresponding optimal assembly parameters according to the models of the drain plate and drain nozzle by operating the human-machine interface; 3-3) Clamp the drain plate to be assembled on the workbench of the intelligent assembly device, and place all the drain nozzles to be assembled into the vibrating plate discharge system of the intelligent assembly device; 3-4) Start the intelligent assembly device and assemble all the nozzles to be assembled onto the drain plate.

6. The method for improving nozzle assembly quality according to claim 5, characterized in that: In step 3-4), the intelligent assembly device assembles all the nozzles to be assembled onto the drain plate in two modes: 3-4-1) Overall scanning mode: The intelligent assembly device first scans and stores all the holes on the drain plate, and then assembles the drain nozzle; 3-4-2) Local scanning mode: ① The intelligent assembly device obtains the center position of a hole on the leak plate by scanning, and then assembles the leak nozzle according to the center position of the hole; ② Repeat step ① until all the nozzles corresponding to the holes of the leak plate are assembled.

7. An intelligent nozzle assembly device for the method according to claim 1, characterized in that: The invention comprises a workbench (3), on which a rectangular coordinate robot (4) for assembling a leak plate and a fixture (2) for fixing the leak plate are arranged, the end effector of the rectangular coordinate robot (4) is a pneumatic pressing device (8) for pressing a leak nozzle, a visual recognition device (6) is arranged beside the pneumatic pressing device (8), the visual recognition device (6) is used to identify the center position of each hole on the leak plate, the visual recognition device (6) is electrically connected to an intelligent calibration unit arranged on the workbench (3) and is used to obtain and store optimal assembly parameters of the leak plate, the intelligent calibration unit is electrically connected to a PLC controller for controlling the rectangular coordinate robot (4) to assemble the leak nozzle, and the pneumatic pressing device (8) is connected to a vibration plate discharging mechanism (5) arranged beside the workbench (3) through a swing rod type material distribution mechanism (11) and a conveying pipe.

8. The intelligent assembly device according to claim 7, characterized in that: The rectangular coordinate robot (4) comprises an X-axis guide rail (401), a Y-axis guide rail (403) and a Z-axis guide rail (404), wherein the two X-axis guide rails (401) are arranged at the upper end of the workbench (3), the two ends of the Y-axis guide rail (403) are respectively connected to a first slider (402) on the X-axis guide rail (401), the Z-axis guide rail (404) is connected to a second slider (405) on the Y-axis guide rail (403), and the Z-axis guide rail (404) is provided with a third slider (406), and the third slider (406) is installed with a pneumatic pressing device (8), a visual recognition device (6) and a rocker-type material distribution mechanism (11).

9. The intelligent assembly device according to claim 8, characterized in that: The X-axis guide rail (401), the Y-axis guide rail (403) and the Z-axis guide rail (404) all use linear motors.

10. The intelligent assembly device according to claim 7, characterized in that: The pneumatic pressing device (8) is provided with a first through hole (801) and a second through hole (802), wherein 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 assembly hole perpendicular to the surface of the workbench (3), a punching needle (9) driven by a cylinder is clearance-matched with the first through hole (801), and the second through hole (802) is a feed hole connected to a discharge pipe of a rocker-type material distributing mechanism (11), and after the drain nozzle to be installed moves from the second through hole (802) to the first through hole (801), the cylinder drives the punching needle (9) to push the installed drain nozzle out of the first through hole (801) and assemble it into the hole position of the drain plate.

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