Aerosol can blowing apparatus and control method therefor

Abstract

The application relates to a sprayer cylinder blow molding device and a control method thereof, and relates to the technical field of blow molding processing equipment.The sprayer cylinder blow molding device comprises a soft material supply structure, a blow molding execution structure and a mold clamping structure, and further comprises a waste material removing structure for removing the waste material attached to the molding cylinder, the operation area of the soft material supply structure is arranged as a feeding station, the operation area of the blow molding execution structure is arranged as a blow molding station, the blow molding station is provided with a waste removing station on the side far from the feeding station, and the mold clamping structure reciprocally slides between the feeding station and the blow molding station; the waste material removing structure comprises a fixing assembly and a shearing assembly, the fixing assembly is installed on the mold clamping structure, the fixing assembly moves synchronously with the mold clamping structure, and the shearing assembly is used for shearing the waste material.The sprayer cylinder blow molding device has the effects of realizing production automation and improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of blow molding equipment technology, and in particular to a blow molding device for a sprayer cylinder and its control method. Background Technology

[0002] Plastic sprayer cylinders are generally manufactured using blow molding technology. Molten soft material is output through extrusion equipment, and after the mold closes to wrap the blank, air is blown to form a hollow shape.

[0003] After the sprayer cylinder is blow-molded, excess waste material will remain at the port. In the existing processing flow, after the blow-molded cylinder is discharged, the waste material is usually removed by manual trimming or by manually transferring the cylinder to a special station to remove the waste material.

[0004] However, manual transfer and manual trimming are inefficient and difficult to adapt to the needs of automated and high-efficiency production. Summary of the Invention

[0005] To achieve production automation and improve production efficiency, this invention provides a blow molding device for sprayer cylinders and its control method.

[0006] In a first aspect, the present invention provides a blow molding apparatus for a sprayer cylinder, which adopts the following technical solution: A blow molding apparatus for a sprayer cylinder includes a soft material supply structure, a blow molding execution structure, and a mold clamping structure. It also includes a waste removal structure for removing waste material attached to the molded cylinder. The working area of ​​the soft material supply structure is set as a material supply station, the working area of ​​the blow molding execution structure is set as a blow molding station, and a waste removal station is provided on the side of the blow molding station away from the material supply station. The mold clamping structure reciprocates between the material supply station and the blow molding station. The waste removal structure includes a fixing component and a shearing component. The fixing component is installed on the mold clamping structure and moves synchronously with the mold clamping structure. When the mold clamping structure slides from the feeding station to the blow molding station, the fixing component clamps and moves the molded cylinder on the blow molding station to the waste removal station. The shearing component is used to cut off the waste.

[0007] By adopting the above technical solution, the fixed component that operates synchronously with the mold clamping structure is used to transfer the blow-molded cylinder to the waste removal station on one side of the blow molding station. In conjunction with the shearing component, the waste part on the molded cylinder is automatically removed, realizing the automatic transfer of the molded cylinder and the removal of waste, thus improving production efficiency.

[0008] Optionally, the blow molding execution structure, the mold clamping structure, and the waste removal structure are all symmetrically arranged in two sets along the material feeding station and correspond one-to-one. The two sets of mold clamping structures alternately slide to the material feeding station to complete the reception of soft material.

[0009] By adopting the above technical solution, and utilizing two sets of blow molding execution structures, mold clamping structures, and waste removal structures symmetrically arranged along the material feeding station, blow molding is carried out in a sequential cycle, realizing staggered operation of the station and further improving production efficiency.

[0010] Optionally, the waste removal station is provided with an open grinding structure; The opening grinding structure includes a second lifting component and a rotary hole component. The second lifting component drives the rotary hole component to approach or move away from the forming cylinder at the waste removal station. The rotary hole component includes several synchronously rotating processing shafts. The position and number of processing shafts correspond one-to-one with the opening position on the forming cylinder. The processing shafts are used to perform rotary cutting, hole repair grinding on the opening position of the forming cylinder after the waste is removed.

[0011] By adopting the above technical solution, multiple sets of synchronously rotating machining axes are used to perform rotary cutting and grinding on the opening positions of the cylinder after the waste material is removed, so as to complete the precision machining of multiple holes in one go, ensuring the uniformity of the opening specifications and improving the machining accuracy of the workpiece.

[0012] Optionally, a centralized material unloading structure is provided at the waste removal station; The centralized feeding structure includes a receiving base plate, a limiting side plate, and a centralized material trough. The receiving base plate is used to receive the processed molded cylinder, the limiting side plate is used to guide and limit the molded cylinder, and the centralized material trough is used to collect and receive the waste generated during the processing.

[0013] By adopting the above technical solution, the bottom plate is used to stably support the processed molded cylinder, and the limiting side plate is used to guide and store the molded cylinder. Then, the waste generated during processing is collected in a unified manner using a centralized material trough, which facilitates the sorting and recycling of materials.

[0014] Optionally, the mold clamping structure includes molding components, two of which are symmetrically arranged and slide open and close in opposite directions, and the two molding components after closing form a molding cavity. The fixing component includes a clamping seat, and two clamping seats are provided in a one-to-one correspondence with the forming component. The two clamping seats open and close synchronously as the two forming components slide in opposite directions, thereby realizing the clamping and releasing of the forming cylinder.

[0015] By adopting the above technical solution, two sets of opposing sliding and opening molding components are used to form a molding cavity, driving the clamping seat to open and close synchronously, thereby achieving the clamping and releasing of the molding cylinder and ensuring uniform clamping force during the transfer of the molding cylinder.

[0016] Optionally, the mold clamping structure further includes an opening and closing component; The opening and closing assembly includes a support frame, a sliding rod, a connecting plate, and an opening and closing cylinder. One end of the sliding rod is fixedly connected to one of the molding components, and the other end of the sliding rod slides through another molding component and is fixedly connected to the connecting plate. The opening and closing cylinder is fixedly installed on the molding component near the connecting plate, and the output end of the opening and closing cylinder is fixedly connected to the connecting plate. The sliding rod slides through the support frame.

[0017] By adopting the above technical solution, an opening and closing transmission structure is formed by the cooperation of an opening and closing cylinder, a connecting plate and a sliding rod. The opening and closing cylinder drives the sliding rod to slide smoothly in the support frame, driving the two sets of forming components to open and close precisely in opposite directions. The overall transmission structure is simple, compact and stable in operation.

[0018] Secondly, this application provides a control method for a blow molding apparatus for a sprayer cylinder, which adopts the following technical solution: A control method for a blow molding apparatus for a sprayer barrel, applied to a blow molding apparatus for a sprayer barrel as described in the first aspect, comprising: S10: In response to the closing clamping signal, acquire the stable pressure inside the fixing component; S11: Obtain the cylinder parameters and no-load pressure of the standard finished molded cylinder; S12: Set the clamping threshold based on the no-load pressure and cylinder parameters; S13: When the stable pressure is not less than the clamping threshold, read the friction coefficient from the cylinder parameters; S14: Determine the maximum static friction force based on the steady pressure and the coefficient of friction; S15: Responds to the blow molding reset signal and continuously updates the dynamic actual pressure. S16: Determine the slippage state of the formed cylinder by combining the stable pressure, actual pressure and maximum static friction force. The slippage state includes no slippage. S17: Based on no slippage, generate and send a clear signal to control the operation of the shearing component.

[0019] By adopting the above technical solution, the pressure sensor inside the fixed component collects the clamping stable pressure and dynamic actual pressure in real time, and calculates the maximum static friction force in combination with the friction coefficient, and determines the cylinder slippage state in real time. The waste removal operation is only started when the forming cylinder does not slip.

[0020] Optionally, the method for determining the slippage state of the formed cylinder includes: S20: The pressure increment is calculated by subtracting the actual pressure from the stable pressure. S21: Determine the vertical tension based on the pressure increment and compare it with the maximum static friction force; S22: When the vertical tension is not greater than the maximum static friction force, the slip state of the formed cylinder is determined to be no slip. S23: When the vertical tension is greater than the maximum static friction, the slippage state of the formed cylinder is determined to be a slippage risk.

[0021] By adopting the above technical solution, the pressure increment is obtained by using the difference between real-time pressure and stable pressure. The real-time vertical tension is queried through a preset corresponding table, and the vertical tension is compared with the maximum static friction to determine the slippage risk.

[0022] Optionally, after determining the slippage state of the molded cylinder, the following steps are also included: S30: Based on the risk of slippage, determine the pushing distance that supports the bottom of the forming cylinder without cutting the waste material according to the cylinder parameters and the preset initial position of the shear block; S31: Control the movement of the shear block based on the push distance; S32: Set the downward thrust and warning pressure based on the maximum static friction force; S33: Based on the downward thrust control, the preset vortex assembly is pressed down to push the formed cylinder from top to bottom; S34: Continuously collect the downward pressure at the lower end of the rotary hole assembly; S35: When the downward pressure is not less than the warning pressure, it is determined that the formed cylinder has been pushed back to the correct position; S36: Control the vortex assembly and shear block to reset and send a clear signal.

[0023] By adopting the above technical solution, the shear block extends out in advance to support the bottom of the forming cylinder, and then the rotating hole assembly presses down to push the upward-moving forming cylinder back to its original position. The return-to-center status is determined by the downward pressure collected by the base. When there is a risk of slippage, the forming cylinder is stably driven back to its original position, ensuring the processing status.

[0024] Optionally, after setting the clamping threshold, the following may also be included: S40: When the stable pressure is less than the clamping threshold, the no-load pressure range is determined based on the no-load pressure and the preset redundant pressure. S41: Collect the actual stroke of the mold clamping structure when it performs the closing action; S42: If the stable pressure falls into the no-load pressure range and the actual stroke is consistent with the preset reference stroke, it is determined that the workpiece has fallen and an audible and visual alarm is issued.

[0025] By adopting the above technical solution, and utilizing the dual judgment conditions of the no-load pressure range and the actual stroke of the mold closing, abnormal workpiece falling during the mold closing process can be identified, and an audible and visual alarm can be triggered in a timely manner, which can effectively identify the empty mold clamping condition.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: By using a fixed component that operates synchronously with the mold clamping structure, the blow-molded cylinder is transferred to the waste removal station on one side of the blow molding station. In conjunction with the shearing component, the waste material on the cylinder is automatically removed, realizing automatic transfer of the cylinder and waste removal, thus improving production efficiency. The pressure sensor inside the fixed component collects the stable clamping pressure and the dynamic actual pressure in real time. Combined with the friction coefficient, the maximum static friction force is calculated, and the cylinder slippage status is determined in real time. The waste removal operation is only started when the forming cylinder does not slip. The shear block extends out in advance to support the bottom of the forming cylinder, and then the rotating hole assembly presses down to push the upward-moving forming cylinder back to its original position. The return-to-center status is determined by the downward pressure collected by the base. When there is a risk of slippage, the forming cylinder is stably driven back to its original position to ensure the processing status. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a blow molding device for a sprayer cylinder according to this application; Figure 2 This is a schematic diagram of the soft material supply structure of this application; Figure 3 This is a schematic diagram of the blow molding execution structure of this application; Figure 4 This is a schematic diagram of the mold clamping structure of this application; Figure 5 This is a partial schematic diagram of a blow molding apparatus for a sprayer cylinder according to this application; Figure 6 This is a schematic diagram of the opening grinding structure of this application; Figure 7 This is a schematic diagram of the centralized material feeding structure of this application.

[0028] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Mounting frame; 2. Soft material supply structure; 21. Material supply station; 22. First lifting assembly; 23. Extrusion assembly; 24. Separation assembly; 241. Mounting plate; 242. Cutting cylinder; 243. Connecting rod; 244. Cutter; 245. Fixing plate; 3. Blow molding execution structure; 31. Blow molding station; 32. Blow molding cylinder; 33. Sliding frame; 34. Slide plate; 35. Air blowing pipe; 4. Mold clamping structure; 41. Molding assembly; 411. Mounting template; 412. Molding mold; 413. Molding cavity; 42. Opening... 421. Support frame; 422. Sliding rod; 423. Connecting plate; 424. Opening and closing cylinder; 43. Pushing assembly; 431. Slide rail frame; 432. Pushing cylinder; 5. Waste removal structure; 51. Waste removal station; 52. Fixing assembly; 521. Clamping seat; 522. Clamping end; 53. Shearing assembly; 531. Shearing block; 532. Abutment block; 533. Guide rod; 534. Shearing cylinder; 6. Opening grinding structure; 61. Second lifting assembly; 62. Rotary hole assembly; 7. Centralized unloading structure; 71. Supporting base plate; 72. Limiting side plate; 73. Centralized material trough. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses a blow molding apparatus for a sprayer cylinder.

[0031] Reference Figure 1 A blow molding device for a sprayer cylinder includes an installation frame 1, a soft material supply structure 2, a blow molding execution structure 3, a mold clamping structure 4, a waste material removal structure 5, an opening grinding structure 6, and a centralized unloading structure 7. The soft material supply structure 2, the blow molding execution structure 3, the mold clamping structure 4, the opening grinding structure 6, and the centralized unloading structure 7 are fixedly installed on the installation frame 1, and the waste material removal structure 5 is installed on the mold clamping structure 4. Two sets of the blow molding execution structure 3, the mold clamping structure 4, the opening grinding structure 6, and the centralized unloading structure 7 are symmetrically arranged on the left and right sides.

[0032] Reference Figure 2The soft material supply structure 2 includes a first lifting assembly 22, an extrusion assembly 23, and a separating assembly 24. The first lifting assembly 22 adopts a linear module, the extrusion assembly 23 adopts a blow molding extrusion feed head (which is existing technology), and the separating assembly 24 includes a mounting plate 241, a cutting cylinder 242, a connecting rod 243, a cutter 244, and a fixing plate 245. The linear module is fixedly mounted on the mounting frame 1, with its execution direction vertically set. The blow molding extrusion feed head is fixedly mounted on the output end of the linear module, with the output end of the blow molding extrusion feed head facing downwards. The working area of ​​the feeder head is set as the feeding station 21. The mounting plate 241 is fixedly installed at the lower end of the linear module. There are two connecting rods 243 symmetrically arranged on the left and right, and two cutters 244 symmetrically arranged in front and behind. The connecting rods 243 slide through the mounting plate 241 and the cutter 244 behind. The front end of the connecting rod 243 is fixedly connected to the cutter 244 in front, and the rear end of the connecting rod 243 is fixedly connected to the fixing plate 245. The body and output end of the cutting cylinder 242 are fixedly connected to the fixing plate 245 and the cutter 244 behind, respectively. The closing center of the two cutters 244 is located below the blow molding extrusion feeder head.

[0033] Reference Figure 3 The blow molding execution structure 3 includes a blow molding cylinder 32, a sliding frame 33, a sliding plate 34, and an air blowing pipe 35. The sliding frame 33 is fixedly installed on the mounting frame 1 and located on one side of the soft material supply structure 2. The blow molding cylinder 32 is fixedly installed on the upper end of the sliding frame 33. The sliding plate 34 slides up and down on the sliding frame 33. The output end of the blow molding cylinder 32 is fixedly connected to the sliding plate 34. Three air blowing pipes 35 of different sizes are set at the opening position of the molding cylinder. The three air blowing pipes 35 are fixedly installed on the sliding plate 34. The air outlet of the air blowing pipe 35 is vertically downward. The air blowing pipe 35 is connected to the external air supply equipment. The working area of ​​the air blowing pipe 35 is set as the blow molding station 31.

[0034] Reference Figure 4 and Figure 5The clamping structure 4 includes a molding component 41, an opening and closing component 42, and a pushing component 43. The molding component 41 includes an installation template 411 and a molding die 412. Two installation templates 411 and two molding dies 412 are symmetrically arranged front and back. The molding die 412 is detachably installed on the side of the installation template 411 that is close to each other. When the two molding dies 412 are brought closer together, they form a molding cavity 413 that matches the molding cylinder. The opening and closing component 42 includes a support frame 421, a sliding rod 422, a connecting plate 423, and an opening and closing cylinder 424. The support frame 421 is located between the two installation templates 411. Three sliding rods 422 are arranged horizontally. The front end of the sliding rod 422 is fixedly connected to the front installation template 411, and the rear end of the sliding rod 422 passes through the support frame 421 and the rear installation die in sequence. Plate 411 is fixedly connected to connecting plate 423. Sliding rod 422 is slidably connected to support frame 421 and rear mounting template 411. Opening and closing cylinder 424 is fixedly installed on rear mounting template 411. The output end of opening and closing cylinder 424 is fixedly connected to connecting plate 423. Pushing component 43 includes slide rail frame 431 and pushing cylinder 432. Slide rail frame 431 is fixedly installed on mounting frame 1 and located below support frame 421. The lower end of support frame 421 is provided with slider that cooperates with slide rail frame 431. Support frame 421 is limited and slidably connected to slide rail frame 431 through slider. Pushing cylinder 432 is fixedly installed on slide rail frame 431. The output end of pushing cylinder 432 is fixedly connected to support frame 421. In this embodiment, the two slide rail frames 431 in the two combined mold clamping structure 4 are integrally set.

[0035] The waste removal structure 5 includes a fixing component 52 and a shearing component 53. The fixing component 52 includes a clamping seat 521, two of which are symmetrically arranged front and rear and correspond one-to-one with the mounting template 411. The clamping seat 521 is detachably installed between the mounting template 411 and the molding die 412. The clamping seat 521 extends to the side away from the soft material supply structure 2 and has a clamping end 522. When the mounting template 411 closes at the blow molding station 31, the area where the clamping end 522 closes and clamps is set as the waste removal station 51. The shearing component 53 includes a shearing block 531, an abutment block 532, a guide rod 533, and a shearing cylinder 534. The shearing block 531 has two parts, upper and lower, both located behind the waste removal station 51. The inner shape of each part corresponds to the upper and lower outer edge contours of the forming cylinder. The abutment block 532 has two parts, upper and lower, both located in front of the waste removal station 51. The outer shape of the upper abutment block 532 corresponds to the upper outer edge contour of the forming cylinder and is fixedly installed on the front clamping seat 521. The lower abutment block 532 is slidably installed on the front clamping seat 521 by a spring. There are two guide rods 533 and two shearing cylinders 534, each corresponding to the two shearing blocks 531. The guide rods 533 pass through the rear clamping seat 521. The two guide rods 533 are fixedly connected to the two shearing blocks 531 respectively. The shearing cylinders 534 are fixedly installed on the rear clamping seat 521. The output ends of the two shearing cylinders 534 are fixedly connected to the two shearing blocks 531 respectively.

[0036] Reference Figure 6 The opening grinding structure 6 includes a second lifting component 61 and a rotary hole component 62. The second lifting component 61 adopts a linear module, and the rotary hole component 62 adopts a three-axis synchronous rotary cutting head. The three-axis synchronous rotary cutting head is existing technology. The three-axis synchronous rotary cutting head has three processing axes as output ends. The three processing axes correspond one-to-one with the opening position of the forming cylinder. The three-axis synchronous rotary cutting head is fixedly installed on the output end of the linear module. The linear module is fixedly installed on the mounting frame 1. The execution direction of the linear module is set vertically.

[0037] Reference Figure 7 The centralized feeding structure 7 includes a receiving base plate 71, a limiting side plate 72, and a centralized material trough 73. The receiving base plate 71, the limiting side plate 72, and the centralized material trough 73 are all fixedly installed on the mounting frame 1. There are two limiting side plates 72 arranged symmetrically at the front and back, and the two limiting side plates 72 are located at the front and back sides of the waste removal station 51, respectively. The receiving base plate 71 is located below the waste removal station 51. The receiving base plate 71 is gradually lowered and inclined from the center to both sides. The receiving base plate 71 and the two limiting side plates 72 constitute a channel for the forming cylinder to be fed outward. The centralized material trough 73 is located below the receiving base plate 71. The bottom of the centralized material trough 73 is gradually lowered and inclined from back to front.

[0038] During operation, the right-side push cylinder 432 drives the support frame 421 to slide along the slide rail frame 431 to below the feeding station 21. The first lifting component 22 drives the extrusion component 23 to move downward, and the extrusion component 23 slowly extrudes the soft material. The right-side opening and closing cylinder 424 is activated to push the corresponding connecting plate 423 to move backward. The connecting plate 423 drives the front mounting template 411 to move backward through the sliding rod 422. At the same time, the rear mounting template 411 is moved forward by the reaction force of the opening and closing cylinder 424. The two forming molds 412 synchronously follow the mounting template 411 to close and form a forming cavity 413 with an opening at the top. The soft material is completely wrapped in the forming cavity 413. The cutting cylinder 242 is activated, and the cutting cylinder 242 drives the fixing plate 245 to move backward. The cutting blade 244 at the rear moves away from each other, and the fixed plate 245 drives the cutting blade 244 at the front to move backward through the connecting rod 243. The two cutting blades 244 close together and cut and separate the soft material through shearing action. The first lifting component 22 drives the extrusion component 23 to move upward to avoid the impact. The right-side pushing cylinder 432 drives the support frame 421 to move to the right and below the right-side blow molding station 31. The blow molding cylinder 32 is activated to drive the slide plate 34 to drive the air blowing pipe 35 downward to insert into the soft material in the molding cavity 413 and blow air into the soft material. The soft material forms a hollow molding cylinder along the inner wall of the molding cavity 413. After the molding cylinder cools and solidifies, the molding mold 412 is driven to separate back and forth. At this time, the upper end of the molding cylinder is stuck to the air blowing pipe 35 and will not fall off. Then, the mold is driven to separate back and forth. The support frame 421 moves to the bottom of the feeding station 21 to receive material again. When the installation template 411 closes, it simultaneously drives the two clamping seats 521 to close in the middle. The clamping end 522 of the clamping seat 521 is located at the blow molding station 31 and clamps and fixes the molding cylinder on the blow molding station 31. The blow molding cylinder 32 drives the air pipe 35 to move upward to separate from the molding cylinder. When the molding mold 412 receiving soft material moves from the feeding station 21 to the blow molding station 31 along with the support frame 421, the clamping seat 521 simultaneously drives the molding cylinder to move to the waste removal station 51. The shearing cylinder 534 is activated. The two shearing cylinders 534 control the two shearing blocks 531 to move forward respectively. The guide rod 533 guides and limits the movement. The shearing blocks 531 cooperate with the abutment block 532 to mold the material. Excess waste material at the top and bottom of the cylinder is cut off, and the cut waste material falls into the lower collection trough 73. After cutting, the shear block 531 is reset, and the second lifting component 61 drives the rotary hole component 62 to move downward. The rotary cutting head of the rotary hole component 62 continues to rotate to rotary cut and grind the upper opening position of the forming cylinder. The waste material generated by grinding also falls into the lower collection trough 73. After grinding is completed, the clamping seat 521 separates from the installation template 411. The finished forming cylinder is restricted by the receiving base plate 71 and the limiting side plate 72 and stays at the unloading channel. When the clamping seat 521 carries a new unpolished forming cylinder from the blow molding station 31 to the waste removal station 51, the unpolished forming cylinder pushes the finished forming cylinder to slide outward along the unloading channel.The left and right forming molds 412 move alternately to the feeding station 21 to receive soft materials, and the alternating operation of the two stations improves processing efficiency.

[0039] Based on the same inventive concept, embodiments of the present invention provide a control method for a blow molding device for a sprayer cylinder.

[0040] A control method for a blow molding apparatus for a sprayer cylinder includes the following steps: S10: In response to the closing clamping signal, acquire the stable pressure inside the fixing component 52.

[0041] The closing clamping signal refers to the trigger signal issued when the opening and closing cylinder 424 drives the installation template 411 located on the feeding station 21 to perform the closing operation; when the pushing cylinder 432 is in place, the corresponding installation template 411 is located at the feeding station 21; when the opening and closing cylinder 424 is in place, the corresponding installation template 411 performs the closing operation; when both cylinders are in place, the system automatically issues a closing clamping signal, at which time the fixing component 52 is located at the blow molding station 31 and closes and clamps the molded cylinder.

[0042] Stable pressure refers to the steady-state clamping pressure collected by the pre-set thin-film pressure sensor inside the fixed component 52 after the fixed component 52 completes the closing clamping action. Multiple sets of pressure data are continuously collected by the thin-film pressure sensor. When the fluctuation of multiple sets of pressure data is less than the preset allowable error, the average value is taken as the stable pressure. The allowable error is preset by the operator.

[0043] S11: Obtain the cylinder parameters and no-load pressure of the standard finished molded cylinder.

[0044] The cylinder parameters refer to the set of specifications such as the outer diameter, wall thickness, material, and static friction coefficient of the outer wall of the sprayer forming cylinder, as well as spatial position coordinates. The operator uses tools such as calipers and material friction testing machines to inspect the standard workpiece in advance and determines the position coordinates based on the set three-dimensional coordinate system. The inspection results are then integrated into the cylinder parameters and entered into the system.

[0045] The no-load pressure refers to the basic pre-tightening pressure detected when the fixed component 52 has completed closing and clamping and no molded cylinder is placed inside; the operator controls the installation template 411 to close and collect steady-state pressure in advance when no load is applied, and the average value of multiple collections is taken as the no-load pressure.

[0046] S12: Set the clamping threshold by combining the no-load pressure and cylinder parameters.

[0047] The clamping threshold refers to the pressure threshold for determining whether the molded cylinder will be clamped and fixed. The outer diameter of the cylinder is read from the cylinder parameters, and the corresponding additional pressure is looked up from the pressure correspondence table based on the outer diameter of the cylinder. The pressure correspondence table is a data table that records different outer diameters of cylinders and their corresponding additional pressures. Beforehand, multi-specification cylinder calibration tests are carried out under fixed mold closing conditions. Standard cylinders with different outer diameters are replaced and the corresponding additional pressures for mold closing are collected. The pairing data of multiple sets of outer diameters of cylinders and additional pressures are organized and stored to generate a pressure correspondence table. The clamping threshold is calculated by summing the no-load pressure and the additional pressure.

[0048] S13: When the stable pressure is not less than the clamping threshold, read the friction coefficient from the cylinder parameters.

[0049] The stable pressure is not less than the clamping threshold, which means that the steady-state pressure collected in the current fixing component 52 is not lower than the critical value for clamping and fixing the forming cylinder, indicating that there is a forming cylinder that is stably clamped in the fixing component 52.

[0050] The friction coefficient refers to the friction coefficient between the outer wall of the forming cylinder and the inner clamping surface of the fixing component 52. The friction coefficient between the forming cylinder and the clamping surface is measured in advance by the operator using a friction testing machine and integrated into the cylinder parameters. When in use, the friction coefficient is directly read from the cylinder parameters.

[0051] S14: Determine the maximum static friction force based on the steady pressure and the coefficient of friction.

[0052] The maximum static friction force refers to the upper limit of the resistance between the clamping surfaces of the forming cylinder and the fixed component 52 that can resist the axial sliding of the forming cylinder; the maximum static friction force is calculated by multiplying the stable pressure and the friction coefficient.

[0053] In actual judgment, the dynamic increase of actual extrusion pressure may lead to a corresponding increase in the maximum static friction force. However, in this embodiment, the fixed maximum static friction force corresponding to the stable pressure is selected as the judgment standard, and a safety margin is reserved for the judgment of slippage risk to ensure that no slippage risk is missed.

[0054] S15: In response to the blow molding reset signal, continuously update and collect the actual dynamic pressure.

[0055] The blow molding reset signal is a trigger signal that drives the air blowing pipe 35 to move upward to disengage from the molding cylinder; when the system detects that the fixing component 52 has completed clamping and fixing the molding cylinder, it automatically sends out the blow molding reset signal.

[0056] The actual pressure refers to the real-time pressure collected by the thin-film pressure sensor inside the fixed component 52 during the upward movement and reset of the air tube 35. Throughout the entire process of the upward movement and reset of the air tube 35, the real-time pressure is continuously collected by the thin-film pressure sensor at a fixed sampling frequency to obtain a set of dynamically changing pressure data, i.e., the actual pressure.

[0057] S16: Determine the slippage state of the formed cylinder by combining the stable pressure, actual pressure and maximum static friction force. The slippage state includes no slippage.

[0058] The slippage state refers to the working state in which the forming cylinder slips upward along with the air blowing pipe 35, including two situations: no slippage and slippage risk; the specific determination method will be disclosed in detail in subsequent steps.

[0059] S17: Based on no slippage, generate and send a clear signal to control the operation of the shearing component 53.

[0060] The clearing signal is a trigger signal that controls the operation of the shearing component 53 to cut off the waste portion of the formed cylinder; when the system determines that the slip state is not slipping, a clearing signal is automatically generated and issued.

[0061] Since the forming cylinder does not slide up or down, the shearing component 53 can be directly controlled to cut precisely against the upper and lower edges of the forming cylinder.

[0062] The method for determining the slippage state of the formed cylinder includes the following steps: S20: The pressure increment is calculated by subtracting the actual pressure from the stable pressure.

[0063] Pressure increment refers to the difference between the clamping pressure and the initial steady-state pressure, which is collected in real time during the upward movement of the air tube 35; the difference between the actual pressure and the steady-state pressure is used to obtain a set of pressure increments that correspond one-to-one with the actual pressure.

[0064] S21: Determine the vertical tension based on the pressure increment and compare it with the maximum static friction force.

[0065] Vertical tension refers to the upward dragging force generated on the forming cylinder during the upward movement of the air blowing pipe 35. The corresponding vertical tension is found from the tension correspondence table according to the pressure increment. The tension correspondence table is a data table that records different pressure increments and their corresponding vertical tensions, which is obtained by technicians through prior testing.

[0066] The clamping surface of the fixing component 52 has a slight converging taper along the axial direction of the forming cylinder. The upper clamping inner diameter is slightly smaller than the lower end, forming an inverted wedge-shaped clamping surface. After the forming cylinder is clamped, the outer wall fits against the conical clamping surface. When the air blowing pipe 35 moves, it applies an upward dragging force to the forming cylinder, causing the forming cylinder to slide upward. The forming cylinder and the clamping surface form an inclined force relationship. The vertical dragging force is decomposed into a radial additional compressive force along the normal direction of the conical surface, which increases the lateral clamping pressure. The greater the vertical dragging force, the more significant the conical wedge tightening effect, and the more obvious the increase in lateral compressive force. The operator measures this in advance through a calibration test, applies multiple increments of upward dragging force to the forming cylinder with a tension gauge, and records the corresponding lateral clamping pressure increments. The multiple sets of one-to-one paired pressure increments are integrated with the vertical tension data to generate a tension correspondence table.

[0067] S22: When the vertical tension is not greater than the maximum static friction force, the slip state of the formed cylinder is determined to be no slip.

[0068] If the vertical pulling force is not greater than the maximum static friction force, it means that the upward drag force on the forming cylinder does not exceed the maximum static friction force, and the forming cylinder has definitely not slipped upwards, so it can be directly determined that there has been no slippage.

[0069] S23: When the vertical tension is greater than the maximum static friction, the slippage state of the formed cylinder is determined to be a slippage risk.

[0070] If the vertical pulling force is greater than the maximum static friction force, it means that the upward drag force on the forming cylinder has exceeded the maximum static friction force, and the forming cylinder is at risk of sliding upwards, thus it is determined that there is a risk of sliding.

[0071] After determining the slippage state of the molded cylinder, the following steps are also included: S30: Based on the risk of slippage, determine the pushing distance that supports the bottom of the forming cylinder without cutting the waste material according to the cylinder parameters and the initial position of the preset shear block 531.

[0072] The shear block 531 refers to the lower shear block 531 in a blow molding device for a sprayer cylinder, which is driven by the corresponding shear cylinder 534 to slide back and forth.

[0073] The initial position refers to the waiting position when the shear block 531 moves to the waste removal station 51 according to the installation template 411 and is in a retracted state; the initial position of the shear block 531 is obtained by the operator in advance by setting a three-dimensional coordinate system based on the waste removal station 51 and actually measuring it.

[0074] The pushing distance refers to the horizontal distance that drives the shearing block 531 to move forward from its initial position to the bottom of the forming cylinder for support without touching the waste material. The position coordinates of the forming cylinder are obtained from the cylinder parameters, and then the position of the standard forming cylinder in the three-dimensional coordinate system is determined. The pushing distance is determined based on the position of the waste material and the initial position.

[0075] S31: Control the movement of the shear block 531 based on the pushing distance.

[0076] The shearing block 531 below is driven by the shearing cylinder 534 to move forward based on the pushing distance.

[0077] S32: Set the downward thrust and warning pressure based on the maximum static friction.

[0078] The downward thrust refers to the driving force required to drive the rotary hole assembly 62 downward to push the forming cylinder to overcome the maximum static friction force and move downward to reset. The downward thrust is calculated based on the product of the preset downward thrust ratio and the maximum static friction force. In this embodiment, the downward thrust ratio is set to 1.2.

[0079] The warning pressure refers to the reaction force experienced by the swirl hole assembly 62 after the lower end of the forming cylinder is rigidly restricted by the shear block 531. The warning pressure is calculated by multiplying the preset warning multiple with the maximum static friction force. In this embodiment, the warning multiple is set to 1.6.

[0080] S33: Based on the downward thrust control preset, the swirl hole assembly 62 is pressed down to push the formed cylinder from top to bottom.

[0081] The swirl hole assembly 62 refers to a swirl hole assembly 62 in a blow molding device for a sprayer cylinder.

[0082] S34: Continuously collect the downward pressure at the lower end of the rotary hole assembly 62.

[0083] Downward pressure refers to the reaction force exerted on the forming cylinder by the processing shaft of the swivel hole assembly 62 as it moves downward. The downward pressure is obtained by collecting pressure data in real time through a pressure sensor pre-set on the swivel hole assembly 62. The swivel hole assembly 62 will not open during the downward pressing process; it is only used to push the cylinder downward.

[0084] The lower end of the rotary hole assembly 62 is a machining shaft that needs to perform rotational operations. Therefore, the pressure sensor cannot be directly placed on the machining shaft. In this embodiment, the pressure sensor is placed between the rotary hole assembly 62 and the output connection plate of the second lifting assembly 61.

[0085] S35: When the downward pressure is not less than the warning pressure, it is determined that the formed cylinder has been pushed back to the correct position.

[0086] If the downward pressure is not less than the warning pressure, it means that the reaction force received by the swirl hole assembly 62 during the process of pushing the forming cylinder exceeds the warning pressure. This indicates that the lower end of the forming cylinder has already come into contact with the shear block 531 and cannot move further downward. In other words, the forming cylinder is in a standard posture and can be used for waste removal.

[0087] S36: Control the rotary hole assembly 62 and the shear block 531 to reset and send a clear signal.

[0088] The formed cylinder, which is already in the standard posture, can be cleaned by controlling the vortex assembly 62 and the shear block 531 to reset and send a clean signal.

[0089] After setting the clamping threshold, the following steps are also included: S40: When the stable pressure is less than the clamping threshold, the no-load pressure range is determined based on the no-load pressure and the preset redundant pressure.

[0090] If the stable pressure is less than the clamping threshold, it means that the steady-state pressure collected in the current fixing component 52 is lower than the critical value for clamping and fixing the forming cylinder, indicating that there is no forming cylinder in the fixing component 52 or the clamping of the forming cylinder is not tight.

[0091] Redundant pressure refers to the allowable pressure deviation under no-load conditions; it is set directly by the operator and pre-entered into the system.

[0092] The no-load pressure range refers to the pressure fluctuation range formed by the superposition of no-load pressure and redundant pressure. The no-load pressure range is obtained by taking the difference and sum of the no-load pressure and the redundant pressure, and then using the results as the lower limit and upper limit of the no-load pressure range, respectively.

[0093] S41: Collect the actual stroke of the mold clamping structure 4 when it performs the closing action.

[0094] The actual travel refers to the actual displacement detected when the installation template 411 closes from the starting position to the middle; the actual travel is obtained in real time by a linear displacement sensor that is pre-set on the installation template 411.

[0095] S42: If the stable pressure falls into the no-load pressure range and the actual stroke is consistent with the preset reference stroke, it is determined that the workpiece has fallen and an audible and visual alarm is issued.

[0096] The reference stroke refers to the distance that the installation template 411 needs to move when it closes and drives the clamping seat 521 to clamp the corresponding forming cylinder under standard working conditions. The operator sets the stroke, i.e. the reference stroke, according to the structure of the forming cylinder and the corresponding equipment, and pre-enters it into the system.

[0097] If the stable pressure falls into the no-load pressure range and the actual stroke is consistent with the reference stroke, it means that the installation template 411 has been closed in place and there is no situation where the pressure is abnormal due to incomplete clamping. At the same time, the stable pressure is in the no-load pressure range, which means that there is no clamped forming cylinder in the fixing component 52. It is determined that the forming cylinder fell before the fixing component 52 clamped it, and manual intervention by the operator is required.

[0098] The baseline travel range is set based on the baseline travel and the preset redundant travel. When the actual travel falls into the baseline travel range, it is determined that the actual travel is consistent with the baseline travel. The redundant travel is preset by the operator.

[0099] Audible and visual alarms refer to the system driving a preset buzzer and warning light to operate; when the system determines that a workpiece has fallen, it automatically outputs a high-level signal to start the alarm.

[0100] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A blow molding apparatus for a sprayer cylinder, comprising a soft material supply structure (2), a blow molding execution structure (3), and a mold clamping structure (4), characterized in that, It also includes a waste removal structure (5) for removing waste attached to the molded cylinder, the working area of ​​the soft material supply structure (2) is set as the feeding station (21), the working area of ​​the blow molding execution structure (3) is set as the blow molding station (31), the blow molding station (31) is provided with a waste removal station (51) on the side away from the feeding station (21), and the mold clamping structure (4) slides back and forth between the feeding station (21) and the blow molding station (31); The waste removal structure (5) includes a fixing component (52) and a shearing component (53). The fixing component (52) is installed on the mold clamping structure (4). The fixing component (52) moves synchronously with the mold clamping structure (4). When the mold clamping structure (4) slides from the feeding station (21) to the blow molding station (31), the fixing component (52) clamps and moves the molded cylinder on the blow molding station (31) to the waste removal station (51). The shearing component (53) is used to cut off the waste.

2. The blow molding apparatus for a sprayer cylinder according to claim 1, characterized in that, The blow molding execution structure (3), the mold clamping structure (4) and the waste removal structure (5) are all symmetrically arranged in two sets along the feeding station (21) and correspond one to one. The two sets of the mold clamping structure (4) alternately slide to the feeding station (21) to complete the receiving of soft material.

3. The blow molding apparatus for a sprayer cylinder according to claim 1, characterized in that, An open grinding structure (6) is provided at the waste removal station (51). The opening grinding structure (6) includes a second lifting component (61) and a rotary hole component (62). The second lifting component (61) drives the rotary hole component (62) to approach or move away from the forming cylinder on the waste removal station (51). The rotary hole component (62) includes several synchronously rotating processing shafts. The position and number of processing shafts correspond one-to-one with the opening position on the forming cylinder. The processing shafts are used to perform rotary cutting, hole repair grinding processing on the opening position of the forming cylinder after the waste is removed.

4. The blow molding apparatus for a sprayer cylinder according to claim 1, characterized in that, A centralized material unloading structure (7) is provided at the waste removal station (51); The centralized feeding structure (7) includes a receiving base plate (71), a limiting side plate (72), and a centralized material trough (73). The receiving base plate (71) is used to receive the processed molded cylinder, the limiting side plate (72) is used to guide and limit the molded cylinder, and the centralized material trough (73) is used to receive and collect the waste generated during the processing.

5. The blow molding apparatus for a sprayer cylinder according to claim 1, characterized in that, The mold clamping structure (4) includes a molding component (41). Two molding components (41) are symmetrically arranged and slide open and close in opposite directions. The two molding components (41) after closing form a molding cavity (413). The fixing component (52) includes a clamping seat (521). Two clamping seats (521) are provided in a one-to-one correspondence with the forming component (41). The two clamping seats (521) open and close synchronously with the opposing sliding of the two forming components (41), thereby realizing the clamping and releasing of the forming cylinder.

6. The blow molding apparatus for a sprayer cylinder according to claim 5, characterized in that, The mold clamping structure (4) also includes an opening and closing component (42); The opening and closing assembly (42) includes a support frame (421), a sliding rod (422), a connecting plate (423), and an opening and closing cylinder (424). One end of the sliding rod (422) is fixedly connected to one of the molding assemblies (41), and the other end of the sliding rod (422) slides through another molding assembly (41) and is fixedly connected to the connecting plate (423). The opening and closing cylinder (424) is fixedly installed on the molding assembly (41) near the connecting plate (423). The output end of the opening and closing cylinder (424) is fixedly connected to the connecting plate (423), and the sliding rod (422) slides through the support frame (421).

7. A control method for a blow molding apparatus for a sprayer barrel, applied to a blow molding apparatus for a sprayer barrel as described in any one of claims 1 to 6, characterized in that, include: S10: In response to the closing clamping signal, acquire the stable pressure inside the fixing component (52); S11: Obtain the cylinder parameters and no-load pressure of the standard finished molded cylinder; S12: Set the clamping threshold based on the no-load pressure and cylinder parameters; S13: When the stable pressure is not less than the clamping threshold, read the friction coefficient from the cylinder parameters; S14: Determine the maximum static friction force based on the steady pressure and the coefficient of friction; S15: Responds to the blow molding reset signal and continuously updates the dynamic actual pressure. S16: Determine the slippage state of the formed cylinder by combining the stable pressure, actual pressure and maximum static friction force. The slippage state includes no slippage. S17: Based on no slippage, generate and send a clear signal to control the operation of the shearing component (53).

8. The control method for a blow molding device for a sprayer cylinder according to claim 7, characterized in that, The methods for determining the slippage state of the formed cylinder include: S20: The pressure increment is calculated by subtracting the actual pressure from the stable pressure. S21: Determine the vertical tension based on the pressure increment and compare it with the maximum static friction force; S22: When the vertical tension is not greater than the maximum static friction force, the slip state of the formed cylinder is determined to be no slip. S23: When the vertical tension is greater than the maximum static friction, the slippage state of the formed cylinder is determined to be a slippage risk.

9. The control method for a blow molding device for a sprayer cylinder according to claim 8, characterized in that, After determining the slip state of the formed cylinder, the following is also included: S30: Based on the risk of slippage, determine the pushing distance that supports the bottom of the forming cylinder without cutting the waste material according to the cylinder parameters and the initial position of the preset shear block (531); S31: Control the movement of the shear block (531) based on the pushing distance; S32: Set the downward thrust and warning pressure based on the maximum static friction force; S33: Based on the downward thrust control preset swivel assembly (62) presses down to push the formed cylinder from top to bottom; S34: Continuously collect the downward pressure at the lower end of the vortex assembly (62); S35: When the downward pressure is not less than the warning pressure, it is determined that the formed cylinder has been pushed back to the correct position; S36: Control the swivel assembly (62) and shear block (531) to reset and send a clear signal.

10. The control method for a blow molding apparatus for a sprayer barrel according to claim 7, characterized in that, After setting the clamping threshold, it also includes: S40: When the stable pressure is less than the clamping threshold, the no-load pressure range is determined based on the no-load pressure and the preset redundant pressure. S41: Collect the actual stroke of the mold clamping structure (4) when it performs the closing action; S42: If the stable pressure falls into the no-load pressure range and the actual stroke is consistent with the preset reference stroke, it is determined that the workpiece has fallen and an audible and visual alarm is issued.

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