A quick-release rotary threaded end cap machining method for a dust removal filter element

Abstract

The present application relates to threaded end cap processing technical field, especially to a kind of quick-release type rotary threaded end cap processing method for dust filter element, comprising: multiple roll forming is carried out to metal sheet, and the thinning rate of last time roll is detected;The outer circumferential surface of cover body is rolled to form outer thread, the thread pitch diameter of outer thread is detected, the feed amount of roll is determined by the thinning rate, and the feed amount is secondly adjusted according to the size deviation of thread pitch diameter;According to the size of the lower end surface of cover body, annular metal framework is formed;Elastomeric polymer is vulcanized to form elastic ring on the outer periphery of annular metal framework, wherein the initial height of elastic ring after vulcanization forming is determined by the standard deviation of the thread pitch diameter of several outer threads;Elastic ring is assembled with cover body;Pre-compression treatment is carried out to form rotary threaded end cap crude product;Surface treatment is carried out.The present application realizes the improvement of the sealing property and anti-interference ability of rotary threaded end cap.

Description

Technical Field

[0001] This invention relates to the field of threaded end cap processing technology, and in particular to a method for processing a quick-release rotary threaded end cap for dust collector filter elements. Background Technology

[0002] In existing technologies, engineering plastics are used as raw materials, and the end cap body, threads, and sealing structure are integrally injection molded by an injection molding machine in one go. This is suitable for mass production, but stripping or damage is likely to occur when the end cap is repeatedly disassembled or overtightened. Furthermore, the sealing lip or sealing surface is prone to stress relaxation after long-term pressure, leading to sealing failure. Threaded metal end caps are manufactured by machining metal blanks or castings, but this results in significant material waste due to the large amount of chips produced and long processing time. For large filter elements, the heavy metal end caps increase the overall weight.

[0003] Chinese Patent Publication No. CN111453222A discloses an end cap part with a spiral groove and its five-axis CNC machining method. The end cap body is cylindrical, with a channel running along its central axis inside. A spiral groove quick-connect mechanism is provided at the first end of the end cap body for connection with an elastic positioning pin located in the outlet interface of a paint storage device. The second end of the end cap body is used for connecting external equipment. The spiral groove quick-connect mechanism includes a spiral groove on the side wall of the end cap body. A guide groove pointing towards the first end of the end cap body is connected to the end of the spiral groove near the first end of the end cap body. The end of the guide groove is spaced from the edge of the end face of the first end of the end cap body by a chamfer. Therefore, the spiral groove end cap part and its five-axis CNC machining method suffer from problems such as increased tolerance accumulation due to increased machining frequency and electrostatic adsorption of dust around the workpiece onto the cap body due to continuous operation of the machining structure motor. This leads to increased tightening force of the threaded pair and plastic deformation of the sealing ring, thus increasing the difficulty of disassembly when replacing the filter element. Summary of the Invention

[0004] Therefore, the present invention provides a quick-release rotary threaded end cap processing method for dust collector filter elements, in order to overcome the problems in the prior art where the cumulative tolerance due to the increased processing frequency and the electrostatic adsorption of dust around the workpiece on the cover body caused by the continuous operation of the processing structure motor, resulting in increased tightening force of the thread pair and plastic deformation of the sealing ring, which in turn increases the difficulty of disassembly when replacing the filter element.

[0005] To achieve the above objectives, the present invention provides a method for machining a quick-release rotary threaded end cap for a dust collector filter element, comprising:

[0006] The metal sheet is rolled multiple times to obtain the cover, and the thinning rate of the last roll is detected.

[0007] The outer circumferential surface of the cover is rolled to form an external thread, and the thread pitch diameter of the external thread is measured.

[0008] The feed rate of the roller pressing is determined by the thinning rate, and the feed rate is adjusted a second time according to the dimensional deviation of the thread pitch diameter.

[0009] A ring-shaped metal frame is formed according to the dimensions of the lower end face of the cover;

[0010] An elastic polymer is vulcanized and coated around the annular metal skeleton to form an elastic ring.

[0011] The initial height of the elastic ring after vulcanization is determined by the standard deviation of the thread pitch diameter of several external threads.

[0012] The elastic ring is assembled with the cover body to form an initial rotating threaded end cap;

[0013] The assembled rotary threaded end cap is pre-compressed to form a rough rotary threaded end cap product;

[0014] The rough rotary threaded end cap is surface treated to form the finished rotary threaded end cap.

[0015] Furthermore, the thinning rate is the ratio of the absolute value of the difference between the wall thickness at the start of the last roll and the wall thickness at the end of the last roll to the wall thickness at the start.

[0016] Furthermore, the feed rate of the roller is increased based on the condition that the thinning rate is greater than or equal to the preset thinning rate.

[0017] Furthermore, the secondary adjustment of the feed rate based on the dimensional deviation of the thread pitch diameter includes:

[0018] Compare the dimensional deviation with the preset dimensional deviation;

[0019] If the dimensional deviation is greater than or equal to the preset dimensional deviation, then the feed rate is reduced.

[0020] Furthermore, the dimensional deviation is the difference between the thread pitch diameter at the beginning and the end of the unit monitoring time within the unit monitoring time.

[0021] Furthermore, the reduction in the feed rate is determined based on the difference between the dimensional deviation and the preset dimensional deviation.

[0022] Furthermore, the initial height of the elastic ring after vulcanization is determined by the standard deviation of the thread pitch diameter of several of the external threads, including:

[0023] Compare the standard deviation with the preset standard deviation;

[0024] If the standard deviation is greater than or equal to the preset standard deviation, then the initial height is increased.

[0025] Furthermore, the initial height is the axial dimension of the elastic ring measured after it has been vulcanized and removed and left to stand for a preset time.

[0026] Furthermore, the adjustment range of the initial height is determined based on the difference between the standard deviation and the preset standard deviation.

[0027] Further, the assembled rotary threaded end cap undergoes a pre-compression treatment to form a rough rotary threaded end cap product, including:

[0028] A pre-compression pressure is applied to the non-contact surface between the elastic ring and the cover, and the pre-compression force is maintained.

[0029] The compression of the elastic ring is detected;

[0030] Increase the compression force on the elastic ring until the compression reaches the design size.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention performs multiple roll forming processes on metal sheets and detects the thinning rate of the last roll forming. In high-frequency processing, the accumulation of dimensional tolerances caused by factors such as mold wear and material springback in traditional processes affects the subsequent thread fit accuracy and sealing performance. By adjusting the rolling feed according to the thinning rate, the dimensional accuracy of the thread processing is ensured to be consistent, reducing the problem of tolerance accumulation caused by mold wear or material springback, and avoiding tolerance accumulation caused by increased processing frequency. This reduces the tightening force of the thread pair, making disassembly smoother. Furthermore, by making the gap more uniform, static electricity accumulation is reduced, thereby reducing the probability of dust electrostatic adsorption on the cover. The initial height of the elastic ring is dynamically adjusted according to the standard deviation of the thread pitch diameter, avoiding plastic deformation of the sealing ring under long-term pressure and maintaining stable sealing performance. The pre-compression treatment optimizes the compression of the elastic ring, enabling it to maintain its elastic recovery ability after multiple disassembly and assembly, reducing the difficulty of disassembly, and improving the stability of the mechanical performance of the end cover.

[0032] Furthermore, the method of the present invention enhances the adaptability to material flow behavior during the rolling process by increasing the rolling feed when the thinning rate is greater than or equal to the preset thinning rate. When the material becomes thinner after rolling, it indicates that the material has undergone sufficient plastic deformation and is easy to form. Increasing the feed can improve the thread forming efficiency without causing overcutting or material shortage defects, thereby improving processing efficiency while ensuring processing quality.

[0033] Furthermore, the method of the present invention detects the pitch diameter of the external thread and adjusts the feed rate a second time based on its dimensional deviation. Since continuous motor operation leads to problems such as temperature rise and increased transmission clearance, as the number of processes increases, the rolling wheel gradually wears down, causing changes in its size and shape. This wear results in a continuous, unidirectional drift of the pitch diameter of the rolled thread. The prolonged operation of the motor generates heat, causing thermal expansion of components such as the lead screw and guide rails of the rolling mill, thereby altering the predetermined feed trajectory. Continuous vibration leads to loosening of fasteners, resulting in dimensional changes and fluctuations in the pitch diameter of the thread, causing instability in the thread pair engagement torque. By monitoring the change in the pitch diameter of the thread per unit time and comparing it with a preset deviation threshold, if it exceeds the allowable range, the feed rate is actively reduced to avoid excessive compression leading to tooth distortion, thus reducing frictional resistance and the risk of seizing during thread pair assembly.

[0034] Furthermore, the method of the present invention determines the initial height of the elastic ring after vulcanization based on the standard deviation of the external thread pitch diameter. Due to electrostatic adsorption in a dusty environment, impurities may become embedded in the thread gap or between the compression surfaces. After pre-tightening, the elastic ring with a fixed height is prone to local stress concentration or insufficient compression, which can lead to non-uniform plastic deformation or even premature failure of the sealing ring. By statistically analyzing the dispersion of the thread pitch diameter in multiple batches, the processing consistency level can be judged. When the pitch diameter fluctuates greatly, it indicates that there is uncertainty in the thread matching. By increasing the initial height of the elastic ring, a larger compression allowance is provided to compensate for the axial position offset caused by thread deviation, thereby improving the sealing stability and anti-interference ability.

[0035] Furthermore, the method of the present invention pre-compresses the assembled rotating threaded end cap, thereby releasing the internal stress and creep tendency of the elastic polymer after vulcanization. Since the newly vulcanized rubber material will exhibit significant stress relaxation in the initial compression stage, direct use will result in a decrease in sealing force in the early stages of use. By applying stepwise compression to the elastic ring until the set compression amount is reached, the main deformation process is completed in advance, preventing the risk of leakage due to the decay of sealing force during use, while also reducing the disassembly torque required when the user replaces the filter element. Attached Figure Description

[0036] Figure 1 This is an overall flowchart of the processing method for a quick-release rotary threaded end cap for a dust collector filter element according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the finished structure of the rotary threaded end cap processed by the quick-release rotary threaded end cap processing method for dust collector filter elements according to an embodiment of the present invention;

[0038] Figure 3This is a flowchart illustrating the determination of the initial height of the elastic ring after vulcanization molding in the processing method of the quick-release rotary threaded end cap for dust collector filter element according to an embodiment of the present invention.

[0039] Figure 4 This is a flowchart illustrating the pre-compression process of the quick-release rotary threaded end cap processing method for dust collector filter elements according to an embodiment of the present invention.

[0040] The reference numerals in the attached diagram are as follows: 1-external thread, 2-cap body, 3-elastic ring. Detailed Implementation

[0041] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0042] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0043] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0044] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 The diagrams shown are, respectively, an overall flowchart of the quick-release rotary threaded end cap processing method for dust collector filter elements according to an embodiment of the present invention, a schematic diagram of the finished rotary threaded end cap structure, a flowchart for determining the initial height after vulcanization molding of the elastic ring, and a flowchart for pre-compression treatment. An embodiment of the present invention provides a quick-release rotary threaded end cap processing method for dust collector filter elements, comprising:

[0046] Step S1: The metal sheet is rolled multiple times to obtain the cover 2, and the thinning rate of the last roll is detected.

[0047] Step S2: Roll the outer circumferential surface of the cover 2 to form an external thread 1, and check the thread pitch diameter of the external thread 1.

[0048] The feed rate of the roller pressing is determined by the thinning rate, and the feed rate is adjusted a second time according to the dimensional deviation of the thread pitch diameter.

[0049] Step S3: Form an annular metal frame according to the dimensions of the lower end face of the cover 2;

[0050] Step S4: The elastic polymer is vulcanized and coated around the annular metal skeleton to form an elastic ring 3.

[0051] The initial height of the elastic ring 3 after vulcanization is determined by the standard deviation of the thread pitch diameter of several external threads 1.

[0052] Step S5: Assemble the elastic ring 3 with the cover body 2 to form an initial rotating threaded end cap;

[0053] Step S6: Pre-compress the assembled rotary threaded end cap to form a rough rotary threaded end cap.

[0054] Step S7: Perform surface treatment on the rough rotary threaded end cap to form the finished rotary threaded end cap.

[0055] Specifically, an annular sealing groove is provided on the lower end face of the cover 2.

[0056] Specifically, the surface treatment process for rough rotary threaded end caps includes:

[0057] Spray the rough product of the rotating threaded end cap with alkaline degreasing solution to remove surface oil, dust and debris;

[0058] The rough product of the rotating threaded end cap after spraying is rinsed with deionized water;

[0059] The rinsed rotary threaded end cap rough product is immersed in an iron-based phosphating solution at a temperature of 35℃~45℃ to form a phosphating film on the surface.

[0060] The rough rotary threaded end cap, which forms a phosphate film, is sprayed with an epoxy-polyester hybrid thermosetting powder coating and cured at high temperature to obtain the finished rotary threaded end cap.

[0061] Specifically, the material of the ring-shaped metal frame is cold-rolled carbon steel;

[0062] Cold-rolled carbon steel is stamped using a hydraulic punch press to form a ring-shaped metal skeleton.

[0063] The dimensions of the annular metal frame are interference-fitted with the inner diameter of the annular sealing groove on the lower end face of the cover 2, and the tolerance zone is controlled at grade H7.

[0064] Specifically, iron-based phosphating solutions contain ferrous sulfate compounds and phosphate ions.

[0065] Specifically, the thinning rate is detected using an ultrasonic thickness gauge;

[0066] An ultrasonic thickness gauge measures the wall thickness before and after each roll pressing. For example, if the wall thickness is 1.5 mm at the beginning of the last roll pressing and 1.2 mm at the end, then the thinning rate is 20%.

[0067] The ultrasonic thickness gauge measures the cover 2 at four points distributed at 90° to the center of the horizontal surface and the outer circumference of the cover 2. The average thickness measured at the five points is recorded as the thickness of the cover 2.

[0068] Specifically, the metal sheet is made of aluminum alloy and is 2mm thick, and is rolled using a roller press.

[0069] The roller press performs at least three roller presses on the aluminum alloy sheet.

[0070] Specifically, pressure is applied to the outer circumferential surface of the cover 2 by a roller press to roll out the external thread 1. The feed rate of the roller press is the radial movement speed of the rollers in the roller press.

[0071] Specifically, the thread pitch diameter is detected using a laser sensor.

[0072] Specifically, the outer surface of the elastic ring 3 is pre-compressed by a hydraulic press.

[0073] In practice, the method of this invention involves multiple roll forming processes on metal sheets and detecting the thinning rate of the final roll. In high-frequency processing, traditional processes suffer from dimensional tolerance accumulation due to factors such as mold wear and material springback, which affects subsequent thread fit accuracy and sealing performance. By adjusting the rolling feed based on the thinning rate, the consistency of thread processing dimensional accuracy is ensured, reducing the accumulation of tolerances caused by mold wear or material springback. This avoids tolerance accumulation due to increased processing frequency, thereby reducing the tightening force of the thread pair, making disassembly smoother. Furthermore, by making the gap more uniform, static electricity accumulation is reduced, thus reducing the probability of dust electrostatic adsorption on the cover 2. The initial height of the elastic ring 3 is dynamically adjusted according to the standard deviation of the thread pitch diameter, preventing plastic deformation of the sealing ring under long-term pressure and maintaining stable sealing performance. The pre-compression treatment optimizes the compression of the elastic ring 3, allowing it to maintain its elastic recovery ability after multiple disassembly and assembly, reducing disassembly difficulty and improving the stability of the end cap's mechanical properties.

[0074] Specifically, the thinning rate is the ratio of the absolute value of the difference between the wall thickness at the start of the last roll and the wall thickness at the end of the last roll to the wall thickness at the start.

[0075] Specifically, the feed rate of the roller is increased based on the condition that the thinning rate is greater than or equal to the preset thinning rate.

[0076] Specifically, under the condition that the cover body 2 is formed by rolling and using 5052 aluminum alloy sheet with a thickness of 2.0mm, and through a three-roll rolling process, the general range of the preset thinning rate is [12%, 18%], and the preferred embodiment of the preset thinning rate is 15%.

[0077] Those skilled in the art will understand that the range of preset thinning rates and the preferred embodiments provided in this embodiment are the values ​​that best address the technical problem solved by the present invention, under the condition that the 5052 aluminum alloy sheet with a thickness of 2.0 mm is rolled and the cover 2 is formed by a three-roll rolling process. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset thinning rate according to the actual application environment and application scenario.

[0078] In practice, if the difference between the thinning rate and the preset thinning rate is within 1%, the feed rate of the roller is increased to 1.01. If the difference between the thinning rate and the preset thinning rate exceeds 1%, the feed rate is increased by 0.01 mm / s for every 1% increase. For example, if the wall thickness is 1.5 mm at the start of the last roller pressing and 12 mm at the end, the thinning rate is (1.5 - 1.2) / 1.5 = 20%, which exceeds the preset thinning rate of 15% by 5 percentage points. If the initial feed rate is 0.5 mm / s, the increased feed rate is 0.5 mm / s × 1.01 + 0.01 mm / s × 4 = 0.545 mm / s.

[0079] In practice, the method of the present invention enhances the adaptability to the material flow behavior during the rolling process by increasing the rolling feed when the thinning rate is greater than or equal to the preset thinning rate. When the material becomes thinner after rolling, it indicates that the material has undergone sufficient plastic deformation and is easy to form. Increasing the feed can improve the thread forming efficiency without causing overcutting or material shortage defects, thereby improving the processing efficiency while ensuring the processing quality.

[0080] Specifically, the secondary adjustment of the feed rate based on the dimensional deviation of the thread pitch diameter includes:

[0081] Compare the dimensional deviation with the preset dimensional deviation;

[0082] If the dimensional deviation is greater than or equal to the preset dimensional deviation, then the feed rate is reduced.

[0083] Specifically, the dimensional deviation is the difference between the thread pitch diameter at the beginning and the end of the unit monitoring time within the unit monitoring time.

[0084] Specifically, the duration of a single monitoring session is 1 second.

[0085] Specifically, the reduction in the feed rate is determined based on the difference between the dimensional deviation and the preset dimensional deviation.

[0086] Specifically, when using 5052 aluminum alloy sheet with a thickness of 2.0mm for roll forming and forming the cover 2 through a three-roll forming process, the preset dimensional deviation range is [0.005mm, 0.03mm], preferably 0.01mm.

[0087] Those skilled in the art will understand that the selectable range of the preset size deviation provided in this embodiment and the preferred embodiment are the values ​​that best address the technical problem solved by the present invention under the condition that the cover body 2 is formed by rolling a 5052 aluminum alloy sheet with a thickness of 2.0 mm and a three-roll pressing process. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset size deviation according to the actual application environment and application scenario.

[0088] In practice, if the difference between the dimensional deviation and the preset dimensional deviation exceeds 0.01 mm, the feed rate will decrease by 0.01 mm / s. For example, if the difference between the dimensional deviation and the preset dimensional deviation is 0.04 mm and the current feed rate is 0.5 mm / s, the feed rate will decrease to 0.5 mm / s - 0.01 mm / s × 4 = 0.46 mm / s.

[0089] In practice, the method of this invention detects the pitch diameter of the external thread 1 and adjusts the feed rate a second time based on its dimensional deviation. Continuous motor operation leads to problems such as temperature rise and increased transmission clearance. As the number of processes increases, the rolling wheel gradually wears down, causing changes in its size and shape. This wear results in a continuous, unidirectional drift of the pitch diameter of the rolled thread. Prolonged motor operation generates heat, causing thermal expansion of components such as the lead screw and guide rails of the rolling mill, thus altering the predetermined feed trajectory. Continuous vibration causes loosening of fasteners, leading to dimensional changes and fluctuations in the thread pitch diameter, resulting in unstable thread engagement torque. By monitoring the change in thread pitch diameter per unit time and comparing it with a preset deviation threshold, if it exceeds the allowable range, the feed rate is actively reduced to avoid excessive compression leading to tooth distortion, thus reducing frictional resistance and the risk of seizing during thread assembly.

[0090] Specifically, the initial height of the elastic ring 3 after vulcanization is determined by the standard deviation of the thread pitch diameter of several external threads 1, including:

[0091] Compare the standard deviation with the preset standard deviation;

[0092] If the standard deviation is greater than or equal to the preset standard deviation, then the initial height is increased.

[0093] Specifically, the initial height is the axial dimension of the elastic ring 3 measured after it has been vulcanized and left to stand for a preset time.

[0094] Specifically, the adjustment range of the initial height is determined based on the difference between the standard deviation and the preset standard deviation.

[0095] Specifically, under the conditions of vulcanizing and covering the outer periphery of the annular metal skeleton with nitrile rubber, vulcanizing temperature of 160°C, vulcanizing time of 10 minutes, and sampling and testing of 10 external threads 1, the preset standard deviation range is [0.01mm, 0.05mm], and the preferred embodiment of the preset standard deviation is 0.02mm.

[0096] Those skilled in the art will understand that the range of preset standard deviations and preferred embodiments provided in this embodiment are the values ​​that best address the technical problem solved by the present invention, selected under the conditions of vulcanizing and coating nitrile rubber around the annular metal skeleton, vulcanizing temperature of 160°C, vulcanizing time of 10 minutes, and sampling and testing 10 external threads 1. In actual applications or experiments, those skilled in the art can make adaptive adjustments to the preset standard deviations according to the actual application environment and application scenario.

[0097] In implementation, if the difference between the standard deviation and the preset standard deviation does not exceed 0.01mm, the initial height will increase by 0.15mm. If the difference between the standard deviation and the preset standard deviation exceeds 0.01mm, the initial height will increase by 0.1mm for every 0.01mm exceeding the preset standard deviation. For example, if the difference between the standard deviation and the preset standard deviation is 0.03mm and the currently set initial height is 5mm, the initial height will increase to 5mm + 0.15mm + 0.1mm × 2 = 5.35mm.

[0098] Specifically, the standard deviation of the thread pitch diameter of a plurality of external threads 1 is the standard deviation of the thread pitch diameter of at least 10 consecutively produced cap bodies 2.

[0099] In practice, the method of the present invention determines the initial height of the elastic ring 3 after vulcanization based on the standard deviation of the pitch diameter of the external thread 1. Due to the electrostatic adsorption effect in the dusty environment, impurities may be embedded in the thread gap or between the compression surfaces. After pre-tightening, the elastic ring 3 with a fixed height is prone to local stress concentration or insufficient compression, which leads to non-uniform plastic deformation or even premature failure of the sealing ring. By statistically analyzing the dispersion of the pitch diameter of multiple batches of threads, the processing consistency level is judged. When the pitch diameter fluctuates greatly, it indicates that there is uncertainty in the thread matching. By increasing the initial height of the elastic ring 3, a larger compression margin is provided to compensate for the axial position offset caused by the thread deviation, thereby improving the sealing stability and anti-interference ability.

[0100] Specifically, the assembled rotary threaded end cap undergoes a pre-compression process to form a rough rotary threaded end cap product, including:

[0101] A pre-compression pressure is applied to the non-contact surface between the elastic ring 3 and the cover 2, and the pre-compression force is maintained.

[0102] The compression amount of the elastic ring 3 is detected;

[0103] Increase the compression force on the elastic ring 3 until the compression reaches the design size.

[0104] Specifically, the compression amount is the difference between the initial height of the elastic ring 3 before compression and the real-time height of the elastic ring 3 under pre-compression force.

[0105] Specifically, the compression is detected using a laser displacement sensor.

[0106] In practice, the method of the present invention pre-compresses the assembled rotating threaded end cap, thereby releasing the internal stress and creep tendency of the elastic polymer after vulcanization. Since the newly vulcanized rubber material will produce obvious stress relaxation in the initial pressure stage, direct use will result in a decrease in sealing force in the early stage of use. By applying stepwise compression to the elastic ring 3 until the set compression amount is reached, the main deformation process is completed in advance, preventing the risk of leakage due to the decay of sealing force during use, and reducing the disassembly torque required when the user replaces the filter element.

[0107] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A quick release rotary threaded end cap machining method for a dust filtration cartridge, characterized by, include: The metal sheet is rolled multiple times to obtain the cover, and the thinning rate of the last roll is detected. The outer circumferential surface of the cover is rolled to form an external thread, and the thread pitch diameter of the external thread is measured. The feed rate of the roller pressing is determined by the thinning rate, and the feed rate is adjusted a second time according to the dimensional deviation of the thread pitch diameter. A ring-shaped metal frame is formed according to the dimensions of the lower end face of the cover; An elastic polymer is vulcanized and coated around the annular metal skeleton to form an elastic ring. The initial height of the elastic ring after vulcanization is determined by the standard deviation of the thread pitch diameter of several external threads. The elastic ring is assembled with the cover body to form an initial rotating threaded end cap; The assembled rotary threaded end cap is pre-compressed to form a rough rotary threaded end cap product; The rough rotary threaded end cap is surface treated to form the finished rotary threaded end cap.

2. The quick release threaded end cap machining method for a dust filtration cartridge of claim 1, wherein, The thinning rate is the ratio of the absolute value of the difference between the wall thickness at the start of the last roll and the wall thickness at the end of the last roll to the wall thickness at the start.

3. The quick release threaded end cap machining method for a dust filtration cartridge of claim 2, wherein, The feed rate of the roller is increased based on the condition that the thinning rate is greater than or equal to the preset thinning rate.

4. The quick release threaded end cap machining method for a dust filtration cartridge of claim 3, wherein, The secondary adjustment of the feed rate based on the dimensional deviation of the thread pitch diameter includes: Compare the dimensional deviation with the preset dimensional deviation; If the dimensional deviation is greater than or equal to the preset dimensional deviation, then the feed rate is reduced.

5. The quick release threaded end cap machining method for a dust filtration cartridge of claim 4, wherein, The dimensional deviation is the difference between the thread pitch diameter at the beginning and the end of the unit monitoring time within the unit monitoring time.

6. The quick release threaded end cap machining method for a dust filtration cartridge of claim 5, wherein, The reduction in feed rate is determined based on the difference between the dimensional deviation and the preset dimensional deviation.

7. The quick release threaded end cap machining method for a dust filtration cartridge of claim 6, wherein, The initial height of the elastic ring after vulcanization is determined by the standard deviation of the pitch diameter of several external threads, including: Compare the stated standard deviation with the preset standard deviation; If the standard deviation is greater than or equal to the preset standard deviation, then the initial height is increased.

8. The quick release threaded end cap machining method for a dust filtration cartridge of claim 7, wherein, The initial height is the axial dimension of the elastic ring measured after it has been vulcanized and removed and left to stand for a preset time.

9. The quick release threaded end cap machining method for a dust filtration cartridge of claim 8, wherein, The adjustment range of the initial height is determined based on the difference between the standard deviation and the preset standard deviation.

10. The method for machining a quick-release rotary threaded end cap for a dust collector filter element according to claim 9, characterized in that, The assembled rotary threaded end cap undergoes a pre-compression process to form a rough rotary threaded end cap product, including: A pre-compression pressure is applied to the non-contact surface between the elastic ring and the cover, and the pre-compression force is maintained. The compression of the elastic ring is detected; Increase the compression force on the elastic ring until the compression reaches the design size.

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