Stamping detection device for preparing steel dustbin

Abstract

The stamping detection device comprises an upper die, a lower die and a lifting assembly, and a plurality of pressure measuring micropores are formed in the corners, corresponding to screeding parts, of the lower die; a detection demolding mechanism is arranged outside the lower mold, and is used for introducing pressurized gas into the pressure measuring micropores after stamping is completed, detecting air pressure change and introducing high-speed gas into the pressure measuring micropores in a pulse manner after pressure measurement is completed and it is judged that the to-be-machined panel has no rebound sign; a limiting strip is arranged on one side of the lower die. A pressing frame is elastically arranged on the side, away from the limiting strip, of the upper die. When the upper die and the lower die approach to be closed, the material pressing frame tightly presses the end face of the straight part of the panel to be machined so that the other end of the flat part of the panel to be machined can abut against the lower edge of the limiting strip, and the whole panel to be machined is pre-bent and attached to the interior of the lower die. Through the arrangement of the detection demolding mechanism, resilience of the panel to be machined can be detected, efficient demolding is achieved, and through the arrangement of the limiting strip and the pressing frame, automatic pre-bending and positioning before stamping can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of metal stamping equipment, and in particular to a stamping detection device for preparing steel trash cans. Background Art

[0002] Trash bins are generally supported by plastic or metal and are used to carry garbage. For large-sized trash bins, such as sanitation trash bins, they are generally made of thick-walled galvanized steel plates that are stamped and welded, with a long service life and low cost. Taking outdoor sanitation hook-arm trash bins as an example, they usually include a bottom plate, two end plates, and a panel with arc angles, and garbage delivery ports are set at the arc angles on both sides of the panel. In order to improve the overall strength of the trash bin, ribs are usually punched and reinforced at different parts of each sheet material, and the ribs can be punched and formed as a whole during the stamping process of each sheet material.

[0003] In the related art, the Chinese patent application with application number CN201711344798.1 proposes a trash can stamping die assembly, including a lower die base, a lower die, an upper die base, an upper die, a slope slide and a weighing platform; the lower die is fixed on the lower die base; the lower die base is also provided with a guide rod; the upper die base and the lower die base are guided by the guide rod; the upper die is provided on the upper die base; the upper die is fixed to the upper die base by a spring guide column; the interior of the upper die is provided with a cavity; one end of the spring guide column is fixed to the upper die base, Its other end extends into the cavity of the upper die; a punch head is also provided in the cavity; a spring guide column pushes the punch head out of the round hole and punches into the die cavity on the lower die; a return spring is also provided between the punch head and the inner wall of the upper die for the punch head to rebound into the cavity; a slope slide is also provided on one side of the lower die; the parts on the lower die slide along the slope slide toward the weighing platform; the weighing platform is an electronic weighing device; an air pressure channel is also provided on the lower die; one end of the air pressure channel is located in the stamping area on the lower die, and the other end is connected to an external air pressure source.

[0004] However, in the actual production process, considering the manufacturing cost of the mold, the panels with arc angles on both sides are generally stamped symmetrically and then spliced ​​and welded. This single-sided panel includes a 180° arc angle part and a straight part; and during the stamping process, it is necessary to ensure that the arc angle of the arc angle part of the single-sided panel is consistent with the design, otherwise there will be a problem of misalignment with the end plate. However, in the process of stamping thick steel plates, there is often a phenomenon of stamping rebound, resulting in poor fit between the thick steel plate and the fixed contour of the lower mold; if it cannot be detected in time, it will lead to subsequent rework, affecting the overall processing efficiency; and due to the existence of the punching operation, the panel of this large area is stuck in the stamping mold after stamping, affecting the stripping efficiency. Summary of the Invention

[0005] In order to improve the problem of failure to timely detect the stamping fit of large-area panels after stamping and low stripping efficiency, the present application provides a stamping detection device for preparing steel trash cans.

[0006] The present application provides a stamping detection device for manufacturing a steel trash can, which adopts the following technical solution: A stamping detection device for manufacturing steel trash cans comprises an upper die, a lower die, and a lifting assembly for driving the upper die to rise and fall. The lower die is provided with a plurality of pressure-measuring micropores at the corners corresponding to the ribs. The lower die is provided with a detection and demoulding mechanism for passing pressurized gas into the pressure-measuring micropores after stamping is completed and detecting changes in air pressure. After the pressure measurement is completed and it is determined that there is no sign of rebound in the panel to be processed, a pulsed high-speed gas is passed into the pressure-measuring micropores. A limiting strip is provided on one side of the lower die, and a pressing frame is elastically provided on the side of the upper die away from the limiting strip; when the upper die and the lower die are close to closing the die, the pressing frame presses the end face of the straight part of the panel to be processed so that its other end is pressed against the lower edge of the limiting strip, and pre-bends the entire panel to be processed and fits it in the lower die.

[0007] Furthermore, the demoulding detection mechanism includes: a branch trachea, connected to the pressure measuring micropore; a main trachea, connected to the plurality of branch trachea; a pressure-maintaining cabin, one end of which is connected to the main gas pipe and the other end of which is connected to a gas pipeline connected to an external high-pressure gas source; A pressure valve is provided on the gas pipeline; A pressure measuring valve is provided on the main gas pipe; an air pressure sensor, provided on the pressure maintaining cabin; and The master controller is configured as follows: During pressure measurement, the pressure measuring valve is controlled to open and the pressurizing valve is controlled to close, and if the pressure drop detected by the air pressure sensor is greater than a set value, the lifting assembly is controlled to operate to perform a secondary punching operation; and After pressure measurement, if the pressure drop detected by the air pressure sensor meets the set value, the pressure valve is controlled to open to pressurize the pressure holding chamber and the pressure measuring valve is controlled to pulse open and close so that the pressure measuring micropores pulse out airflow to promote the demolding of the panel to be processed.

[0008] Furthermore, the overall control is also configured to: before each pressure measurement, control the pressure measuring valve to close, and control the pressurizing valve to open, until the air pressure sensor detects that the air pressure in the pressure maintaining cabin reaches a set value, and control the pressurizing valve to close.

[0009] Furthermore, a branch solenoid valve is provided on the branch air pipe, and the master control is further configured to control the plurality of branch solenoid valves to be opened alternately when the pressurizing valve is controlled to be opened after pressure measurement.

[0010] Furthermore, the number of the branch solenoid valves is greater than two and less than or equal to the number of branch air pipes, and the pressure measuring micropores corresponding to the branch solenoid valves that are opened at the same time are distributed on the diagonals of the lower mold or on the diagonals of the punching ribs of the panel to be processed.

[0011] Furthermore, the pressing frame includes: Two oblique brackets are symmetrically arranged about the median line of the upper mold, and their upper ends are hinged to the upper mold; A sliding shaft is fixedly connected to the lower end of the oblique bracket, and its axial direction is perpendicular to the straight portion of the panel to be processed; A concave wheel is slidably sleeved on the sliding shaft and is used for engaging with the end face of the straight portion of the panel to be processed; The elastic component is used to drive the two oblique supports to move closer to each other.

[0012] Furthermore, an electromagnet is provided on one end of the sliding shaft and one of the concave wheel, and a permanent magnet is provided on the other end, and a return spring sleeved on the sliding shaft is provided between the other end of the sliding shaft and the concave wheel; The main controller is also configured to: after pressure measurement, if the pressure drop amplitude detected by the air pressure sensor meets the set value, control the two electromagnets to alternately turn on and off the power or alternately change the direction of the input current, so that the two concave wheels drive the end faces of the straight parts of the panel to be processed to twist horizontally and alternately.

[0013] Furthermore, before the main controller controls the electromagnet to work, it first controls the lifting assembly to drive the upper mold to lift to a set position. At the set position, the end face of the straight part of the panel to be processed is embedded in the concave wheel and the elastic assembly between the two inclined brackets is in a tensile deformation state.

[0014] Furthermore, a plurality of magnets are embedded on the inner wall of the lower mold close to the limiting strip, and the plurality of magnets are arranged at intervals along the length direction of the limiting strip.

[0015] Furthermore, the lower die is opened on one side corresponding to the arc angle end face of the panel to be processed.

[0016] In summary, the beneficial technical effects of this application are: 1. After stamping is completed, high-pressure gas in the pressure chamber is sprayed from multiple pressure-measuring micropores to the corners of the ribs to be processed. Once the panel to be processed rebounds, a gap will inevitably exist between the panel to be processed and the inner wall of the lower die, causing the air pressure in the pressure chamber to drop. This is detected by the air pressure sensor, which can determine whether the panel to be processed has rebounded after stamping, and promptly drive the upper die down for a second stamping to repair it. This greatly saves the time-consuming secondary positioning required in the subsequent inspection process and can significantly improve the processing efficiency of the panel to be stamped; 2. By elastically setting a press frame on the upper die and setting a limit bar on the opposite side of the lower die, when the upper die moves downward, the press frame can push the panel to be processed downward, and the lower part of the panel to be processed can be fitted into the lower die to complete the pre-bending, which can greatly improve the stamping efficiency; and, in the process from the upper die and the lower die are closed to the completion of stamping, the elastically set press frame always elastically pushes the panel to be processed, which can ensure the precise positioning of the panel to be processed before stamping, effectively avoid the possibility of drift of the panel to be processed during the stamping process, and ensure stamping accuracy. At the same time, there is no need to set up a complex positioning module or use manual pressing; 3. If the master controller determines that the panel to be processed has not rebounded, it opens the pressure-increasing valve to increase pressure in the pressure-maintaining chamber, and then causes the pressure-measuring micropores to pulse-jet a higher-pressure, high-speed airflow toward the lower end face of the panel to be processed. This airflow can promote the separation of the panel to be processed from the lower mold under the impact of the airflow, thereby facilitating demoulding. By setting up branch solenoid valves, multiple pressure-measuring micropores can also alternately pulse-jet high-speed airflow, achieving a shaking effect on the panel to be processed in the lower mold, thereby promoting the demoulding efficiency of the stuck panel to be processed in the lower mold. 4. By sliding the concave wheel on the pressing frame onto the sliding shaft, and arranging electromagnets and permanent magnets, the two electromagnets are controlled to be alternately powered on and off or the direction of the input current is alternately changed, so that a magnetic repulsion force that alternately increases or returns to zero is generated between the electromagnet and the corresponding permanent magnet, or an alternating magnetic repulsion or magnetic attraction is generated. The two concave wheels can slide alternately in opposite directions on the corresponding sliding shafts, and then the grooves on the concave wheels can be used to drive the horizontal twisting of the end faces of the straight parts of the panel to be processed, thereby achieving a micro-jitter effect of the arc corners of the panel to be processed in the lower die, and cooperating with the micro-jitter effect of the arc corners in the lower die formed by the pulse ejection of high-speed airflow from multiple pressure measuring micropores, which can promote the separation of the punching ribs on the panel to be processed from the lower die, and also promote the efficient demolding of the panel to be processed after the stamping is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the upper mold and the lower mold of the embodiment of the present application when the mold is not closed; Figure 2 1 is a schematic diagram of the overall structure of the upper mold and the lower mold when the mold is closed in an embodiment of the present application; Figure 3 is a schematic cross-sectional structural diagram of an embodiment of the present application; Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A; Figure 5 yes Figure 1 A partial enlarged schematic diagram of part B.

[0018] Description of reference numerals: 1. Upper mold; 2. Lower die; 21. Pressure measuring microhole; 22. Limit strip; 23. Magnet; 3. Pressing frame; 31. Oblique bracket; 32. Sliding shaft; 33. Concave wheel; 34. Elastic component; 35. Electromagnet; 36. Permanent magnet; 37. Return spring; 41. Branch air pipe; 42. Main air pipe; 43. Pressure chamber; 44. Air supply pipe; 45. Pressurization valve; 46. Pressure measuring valve; 47. Air pressure sensor; 48. Branch solenoid valve; 5. Panel to be processed; 51. Arc corner; 52. Straight portion. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0020] The trash can panel processed in this application is symmetrically divided into two single-sided panels, each of which includes a 180° arc-shaped portion 51 and a straight portion 52, with an overall shape similar to a "J" shape. The arc-shaped portion 51 corresponds to the front or rear front of the trash can, and its free end is used to weld to the trash can bottom plate; the straight portion 52 corresponds to a portion of the trash can top. After the two single-sided panels are joined, the two straight portions 52 are butt-welded to form a complete trash can top. During the stamping process, the arc-shaped portion 51 mainly needs to be stamped and shaped, and ribs are punched to form a garbage inlet. Therefore, during processing, the positioning of the panel 5 to be processed is particularly important. However, this type of panel has a large area, and it takes a long time to adjust the positioning. After stamping, the ribs are prone to poor fit and rebound. In addition, during subsequent demolding, the ribs of the panel are tightly embedded in the lower mold. Using the traditional jacking demolding method can easily cause the arc-shaped portion 51 to deform, affecting the processing quality and processing efficiency. Considering the above issues, this application is filed.

[0021] The present application embodiment discloses a punching detection device for preparing a steel trash can. Figure 1 、 Figure 2 and Figure 3 The present invention comprises an upper die 1, a lower die 2, and a lifting assembly that drives the upper die 1 upward and downward. The lower die 2 is open on one side, corresponding to the arc-shaped end surface of the panel 5 to be processed, to facilitate loading and unloading of large panels from this opening. The sliding structure and lifting assembly of the upper die 1 are conventional and can be fully implemented by those skilled in the art, so there is no need for further explanation.

[0022] A plurality of pressure-measuring microholes 21 are provided at the corners of the lower die 2 corresponding to the ribs, and a detection and demoulding mechanism is provided on the outside of the lower die 2 for introducing pressurized gas into the pressure-measuring microholes 21 after the stamping is completed and detecting the air pressure change, and for pulse-introducing high-speed gas into the pressure-measuring microholes 21 after the pressure measurement is completed and it is determined that the panel 5 to be processed has no signs of rebound; wherein, determining whether the panel 5 to be processed has rebound means that if the pressure drop detected after the pressurized gas is introduced is lower than the set value, it is considered that the fit is good and there is no rebound, and if the pressure drop detected is higher than the set value, it is considered that the fit is poor and there is rebound.

[0023] A limiting strip 22 is provided on one side of the lower die 2, and the limiting strip 22 is provided along the axial direction of the arc angle of the panel 5 to be processed. A press frame 3 is elastically provided on the side of the upper die 1 away from the limiting strip 22. When the upper die 1 and the lower die 2 are close to the mold, the press frame 3 presses the end face of the straight portion 52 of the panel 5 to be processed so that the other end is pressed against the lower edge of the limiting strip 22, and pre-bends the entire panel 5 to be processed and fits it into the lower die 2. Figure 4 A plurality of magnets 23 are embedded on the inner wall of the lower mold 2 close to the limiting strip 22 , and the plurality of magnets 23 are arranged at intervals along the length direction of the limiting strip 22 .

[0024] Among them, reference Figure 3 , the demoulding detection mechanism includes: The branch air pipe 41 is connected to the pressure measuring microhole 21; A main air pipe 42 is connected to multiple branch air pipes 41; A pressure-maintaining cabin 43, one end of which is connected to the main gas pipe 42 and the other end of which is connected to a gas pipe 44 connected to an external high-pressure gas source; A pressurizing valve 45 is provided on the gas delivery pipe 44; The pressure measuring valve 46 is provided on the main gas pipe 42, wherein the pressurizing valve 45 and the pressure measuring valve 46 can both be solenoid valves, and the pressure measuring valve 46 can also be connected to a pulse relay or directly set as a pulse solenoid valve; The air pressure sensor 47 is provided on the pressure maintaining cabin 43 and is used to detect the air pressure change in the pressure maintaining cabin 43 and may be an air pressure detector.

[0025] And, the master controller is configured to: During pressure measurement, the pressure measuring valve 46 is controlled to open and the pressure valve 45 is closed. If the pressure drop detected by the air pressure sensor 47 is greater than the set value, the lifting assembly is controlled to work to perform secondary stamping. After pressure measurement, if the pressure drop detected by the air pressure sensor 47 meets the set value, the pressure valve 45 is controlled to open to pressurize the pressure holding chamber 43 and the pressure measuring valve 46 is controlled to pulse open and close so that the pressure measuring micropores 21 pulse out airflow to promote demolding of the panel 5 to be processed.

[0026] It should also be noted that the pressure measurement is performed after the upper and lower molds 1 and 2 are closed and stamping is complete, and the lifting assembly drives the upper mold 1 to a set position; at this set position, the end surface of the straight portion 52 of the panel 5 to be processed remains in close contact with the press frame 3, and the panel 5 to be processed in the upper and lower molds 1 and 2 is completely separated. Moreover, during the pressure measurement, the air pressure set in the pressure chamber 43 is insufficient to separate the panel 5 from the lower mold 2, and can only penetrate into the possible gap between the panel 5 to be processed and the lower mold 2.

[0027] Therefore, when stamping the panel of the trash can, the cut panel 5 to be processed is first pushed into the lower die 2 through the opening on one side of the lower die 2 to ensure that the end of the panel 5 to be processed is tightly attached to the inner wall of the closed end of the lower die 2, and then one end of the panel 5 to be processed is aligned with the lower side of the upper limit bar 22 on the lower die 2, and the other end extends upward outside the lower die 2; then the upper die 1 is driven downward by the lifting assembly, and the end of the panel 5 to be processed located outside the lower die 2 is stuck in the pressing frame 3; then the upper die 1 is continued to be driven downward by the lifting assembly. As the upper die 1 gradually moves downward, the upper die 1 pushes the panel 5 to be processed downward through the pressing frame 3, and makes the lower part of the panel 5 to be processed fit in the lower die 2 to complete the pre-bending, which can greatly improve the stamping efficiency.

[0028] Moreover, during the process from the closing of the upper mold 1 and the lower mold 2 to the completion of stamping, the elastically set press frame 3 always elastically pushes the panel to be processed 5, which can ensure the accurate positioning of the panel to be processed 5 before stamping, and can effectively avoid the possibility of drift of the panel to be processed 5 during the stamping process, thereby ensuring the stamping accuracy. At the same time, there is no need to set up a complex positioning module or use manual pressing, which simplifies the processing procedure of the "J"-shaped panel to be processed 5 and is suitable for continuous production in the factory.

[0029] When the stamping is completed, the lifting assembly drives the upper mold 1 to lift to the set position. At this time, the upper mold 1 is separated from the panel 5 to be processed in the lower mold 2, and the pressure frame 3 maintains elastic pressure on the panel 5 to be processed. It’s just that the elastic force is weakened after the upper mold 1 is lifted, so it will not interfere with the warping deformation that may occur after the panel 5 to be processed rebounds.

[0030] Therefore, when the main controller controls the pressure measuring valve 46 to open, the high-pressure gas in the pressure-maintaining chamber 43 flows through the main air pipe 42 to multiple branch air pipes 41, and is sprayed from multiple pressure measuring micropores 21 to the corners of the punching part of the panel 5 to be processed. Once the panel 5 to be processed has a poor fit with the lower mold 2 and rebound occurs, there will inevitably be a gap between the panel 5 to be processed and the inner wall of the lower mold 2, which will reduce the air pressure in the pressure-maintaining chamber 43 and be detected by the air pressure sensor 47. Therefore, it can be determined whether the panel 5 to be processed rebounds after stamping, and the upper mold 1 can be driven down in time for secondary stamping for repair, which greatly saves the time-consuming secondary positioning required for subsequent inspection processes and can significantly improve the processing efficiency of the panel 5 to be processed.

[0031] If the pressure drop detected by the air pressure sensor 47 is within the set allowable range, it means that the panel to be processed 5 has a good fit, no rebound phenomenon occurs, and the stamping quality is good. At this time, the main controller controls the pressure valve 45 to open, so that the air pressure in the pressure chamber 43 is increased to a level greater than the air pressure set in the pressure chamber 43 during pressure measurement. Then, the pressure measuring valve 46 is controlled to open and close in pulses, so that the pressure measuring micropores 21 pulse spray a higher-pressure high-speed airflow toward the lower end face of the panel to be processed 5. Under the impact of the airflow, the panel to be processed 5 can be separated from the lower mold 2, thereby facilitating demolding. Moreover, the ribs of the panel to be processed 5 are all provided with pressure measuring micropores 21. After the high-speed airflow blows on the lower end face of the panel to be processed 5, the upward driving force on the panel to be processed 5 is more balanced, and deformation caused by local excessive pressure will not be caused, resulting in a better demolding effect.

[0032] Furthermore, the overall control is also configured as follows: before each pressure measurement, the pressure measuring valve 46 is controlled to be closed, and the pressurizing valve 45 is controlled to be open, until the air pressure sensor 47 detects that the air pressure in the pressure maintaining chamber 43 reaches the set value, and the pressurizing valve 45 is controlled to be closed to ensure the accuracy of each pressure measurement.

[0033] And, refer to Figure 3 Branch solenoid valves 48 are provided on the branch air pipes 41. The master control system is further configured to control the alternating opening of the multiple branch solenoid valves 48 when the pressurizing valve 45 is opened after pressure measurement. The number of branch solenoid valves 48 is greater than two and less than or equal to the number of branch air pipes 41. The pressure-measuring micropores 21 corresponding to the simultaneously opened branch solenoid valves 48 are distributed at diagonal corners of the lower die 2 or at diagonal corners of the punched ribs of the panel 5 to be processed.

[0034] Thus, the multiple pressure measuring micropores 21 can alternately pulse-eject high-speed airflow, which can achieve a shaking effect on the panel to be processed 5 in the lower mold 2, thereby promoting the demoulding efficiency of the embedded panel to be processed 5 in the lower mold 2.

[0035] In addition, refer to Figure 1 、 Figure 2 and Figure 5 , the above-mentioned pressing frame 3 includes: Two oblique brackets 31 are symmetrically provided about the center line of the upper mold 1 , and their upper ends are hinged to the upper mold 1 .

[0036] The sliding shaft 32 is fixed to the lower end of the oblique bracket 31 , and its axial direction is perpendicular to the straight portion 52 of the panel 5 to be processed.

[0037] The concave wheel 33 is slidably mounted on the sliding shaft 32 and is used to engage the end face of the straight portion 52 of the panel 5 to be processed; and in the specific configuration, multiple sets of sliding shafts 32 and corresponding multiple concave wheels 33 can be set at the lower end of the inclined bracket 31 to increase the effective contact area between the pressing frame 3 and the panel 5 to be processed, and reduce local damage to the panel 5 to be processed; in this embodiment, taking the setting of a set of sliding shafts 32 and concave wheels 33 at the lower end of the inclined bracket 31 as an example, it is only used to explain the technical solution of this application, and does not represent a limitation on the technical features in this application.

[0038] The elastic component 34 is used to drive the two oblique brackets 31 to approach each other, and specifically includes at least two tension springs, both ends of which are respectively connected to the sides of the two oblique brackets 31.

[0039] Therefore, when the pressing frame 3 moves downward with the upper mold 1, the multiple concave wheels 33 on the two inclined brackets 31 are pressed against the upper end surface of the straight part 52 of the panel 5 to be processed; and as the upper mold 1 gradually moves downward, the two inclined brackets 31 flip in the direction away from each other, the elastic component 34 is stretched and deformed, and the concave wheels 33 roll on the upper end surface of the straight part 52 of the panel 5 to be processed, which can achieve the elastic downward pressing effect on the panel 5 to be processed without causing obvious sliding damage to the upper end surface of the straight part 52 of the panel 5 to be processed.

[0040] And to further improve the demoulding effect of the processed fabrics.

[0041] In another feasible embodiment, an electromagnet 35 is provided on one end of the sliding shaft 32 and one of the cam wheels 33, and a permanent magnet 36 is provided on the other end. A reset spring 37 is provided on the sliding shaft 32 between the other end of the sliding shaft 32 and the cam wheel 33 to achieve the reset effect of the cam wheel 33 after moving on the sliding shaft 32; in this embodiment, the electromagnet 35 is installed on one end of the sliding shaft 32, and the permanent magnet 36 is installed on the end face of the cam wheel 33.

[0042] The main controller is also configured as follows: after the pressure measurement, if the pressure drop amplitude detected by the air pressure sensor 47 meets the set value, the two electromagnets 35 are controlled to be alternately powered on and off or the direction of the input current is alternately changed, so that the two concave wheels 33 drive the end surface of the straight portion 52 of the panel to be processed 5 to twist alternately horizontally; or, if the panel to be processed 5 still cannot be smoothly demolded after the pressure measuring micropore 21 pulses out a high-speed airflow, the two electromagnets 35 are controlled to be alternately powered on and off or the direction of the input current is alternately changed, so that the two concave wheels 33 drive the end surface of the straight portion 52 of the panel to be processed 5 to twist alternately horizontally, thereby achieving a micro-jitter effect of the arc corner 51 of the panel to be processed 5 in the lower mold 2.

[0043] Moreover, before the main controller controls the electromagnet 35 to work, it first controls the lifting assembly to drive the upper mold 1 to lift to the set position. At this set position, the end face of the straight portion 52 of the panel 5 to be processed is embedded in the concave wheel 33 and the elastic assembly 34 between the two inclined brackets 31 is in a tensile deformation state.

[0044] Therefore, when the upper mold 1 moves downward under the drive of the lifting assembly, the end face of the straight portion 52 of the panel to be processed 5 is embedded in the groove of the concave wheel 33, and as the upper mold 1 continues to move downward, the two concave wheels 33 roll in directions away from each other on the end faces of the straight portion 52. At this time, the two inclined brackets 31 flip in opposite directions, and the elastic component 34 arranged between the two is stretched and deformed, which can apply a downward elastic force to the straight portion 52 of the panel to be processed 5.

[0045] When the pressing frame 3 needs to intervene in the demolding process, the main controller controls the two electromagnets 35 to alternately turn on and off the power or alternately change the direction of the input current, so that the electromagnet 35 and the corresponding permanent magnet 36 generate a magnetic repulsion force that alternately increases or returns to zero, or generates an alternating magnetic repulsion or magnetic attraction, which can make the two concave wheels 33 slide alternately in opposite directions on the corresponding sliding shaft 32, and then use the grooves on the concave wheels 33 to drive the end face of the straight part 52 of the panel to be processed 5 to twist horizontally and alternately, which can achieve the micro-jitter effect of the arc corner 51 of the panel to be processed 5 in the lower mold 2, and cooperate with the micro-jitter effect of the arc corner 51 formed by the pulse ejection of high-speed airflow from multiple pressure measuring micropores 21 in the lower mold 2, which can promote the separation of the punching rib part on the panel to be processed 5 from the lower mold 2, and also promote the efficient demolding of the panel to be processed 5 after the stamping is completed.

[0046] Among them, it should be particularly noted that when the multiple cams 33 on the two inclined brackets 31 drive the end face of the straight portion 52 of the panel 5 to be processed to twist horizontally and alternately, the twisting amplitude should be such as not to cause local distortion to the end face of the straight portion 52, and is generally limited to within 5 times the thickness of the panel to be processed, that is, the total sliding stroke of the cam 33 on the sliding shaft 32 from the compression return spring 37 to the extreme position to the contact with the electromagnet 35 is less than 5 times the thickness of the panel to be processed.

[0047] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0048] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A stamping detection device for manufacturing a steel trash can, comprising an upper die, a lower die, and a lifting assembly for driving the upper die to rise and fall, characterized in that: The lower die is provided with a plurality of pressure-measuring microholes at the corners corresponding to the rib portions, and a detection and demoulding mechanism is provided on the outside of the lower die for passing pressurized gas into the pressure-measuring microholes and detecting changes in air pressure after punching is completed, and for passing high-speed gas into the pressure-measuring microholes in pulses after the pressure measurement is completed and it is determined that there is no sign of rebound in the panel to be processed; A limiting strip is provided on one side of the lower die, and a pressing frame is elastically provided on the side of the upper die away from the limiting strip; when the upper die and the lower die are close to closing the die, the pressing frame presses the end face of the straight part of the panel to be processed so that its other end is pressed against the lower edge of the limiting strip, and pre-bends the entire panel to be processed and fits it in the lower die.

2. A punching detection device for manufacturing a steel trash can according to claim 1, characterized in that: The detection and demoulding mechanism includes: a branch trachea, connected to the pressure measuring micropore; a main trachea, connected to the plurality of branch trachea; a pressure-maintaining cabin, one end of which is connected to the main gas pipe and the other end of which is connected to a gas pipeline connected to an external high-pressure gas source; A pressure valve is provided on the gas pipeline; A pressure measuring valve is provided on the main gas pipe; an air pressure sensor, provided on the pressure maintaining cabin; and The master controller is configured as follows: During pressure measurement, the pressure measuring valve is controlled to open and the pressurizing valve is controlled to close, and if the pressure drop detected by the air pressure sensor is greater than a set value, the lifting assembly is controlled to operate to perform a secondary punching operation; and After pressure measurement, if the pressure drop detected by the air pressure sensor meets the set value, the pressure valve is controlled to open to pressurize the pressure holding chamber and the pressure measuring valve is controlled to pulse open and close so that the pressure measuring micropores pulse out airflow to promote the demolding of the panel to be processed.

3. A punching detection device for manufacturing a steel trash can according to claim 2, characterized in that: The general control is further configured to: before each pressure measurement, control the pressure measuring valve to close and control the pressurizing valve to open, until the air pressure sensor detects that the air pressure in the pressure maintaining cabin reaches a set value, and control the pressurizing valve to close.

4. A punching detection device for manufacturing a steel trash can according to claim 2, characterized in that: The branch air pipe is provided with a branch solenoid valve, and the master control is further configured to control the plurality of branch solenoid valves to be alternately opened when controlling the pressurizing valve to be opened after pressure measurement.

5. A punching detection device for manufacturing a steel trash can according to claim 4, characterized in that: The number of the branch solenoid valves is greater than two and less than or equal to the number of branch air pipes, and the pressure measuring micropores corresponding to the branch solenoid valves that are opened at the same time are distributed on the diagonal sides of the lower mold or on the diagonal sides of the ribs of the panel to be processed.

6. A punching detection device for manufacturing a steel trash can according to any one of claims 1 to 5, characterized in that: The pressing frame comprises: Two oblique brackets are symmetrically arranged about the median line of the upper mold, and their upper ends are hinged to the upper mold; A sliding shaft is fixedly connected to the lower end of the oblique bracket, and its axial direction is perpendicular to the straight portion of the panel to be processed; A concave wheel is slidably sleeved on the sliding shaft and is used for engaging with the end face of the straight portion of the panel to be processed; The elastic component is used to drive the two oblique supports to move closer to each other.

7. A punching detection device for manufacturing a steel trash can according to claim 6, characterized in that: An electromagnet is provided on one end of the sliding shaft and one of the concave wheel, and a permanent magnet is provided on the other end, and a return spring sleeved on the sliding shaft is provided between the other end of the sliding shaft and the concave wheel; The main controller is also configured to: after pressure measurement, if the pressure drop amplitude detected by the air pressure sensor meets the set value, control the two electromagnets to alternately turn on and off the power or alternately change the direction of the input current, so that the two concave wheels drive the end faces of the straight parts of the panel to be processed to twist horizontally and alternately.

8. A punching detection device for manufacturing a steel trash can according to claim 7, characterized in that: Before the main controller controls the electromagnet to work, it first controls the lifting assembly to drive the upper mold to lift to a set position. At the set position, the end face of the straight portion of the panel to be processed is embedded in the concave wheel and the elastic assembly between the two oblique brackets is in a tensile deformation state.

9. The punching detection device for manufacturing a steel trash can according to claim 1, characterized in that: A plurality of magnets are embedded on the inner wall of the lower mold close to the limiting strip, and the plurality of magnets are arranged at intervals along the length direction of the limiting strip.

10. The punching detection device for manufacturing a steel trash can according to claim 1, characterized in that: The side of the lower die corresponding to the arc angle end face of the panel to be processed is open.

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