A punch detection device for preparing a steel garbage can

Abstract

The application relates to a punch detection device for preparing a steel garbage can, which comprises an upper die, a lower die and a lifting assembly, a plurality of pressure measurement micro-holes are arranged at the corners of the rib part of the lower die, a detection demolding mechanism is arranged outside the lower die and used for passing pressurized gas into the pressure measurement micro-holes after punch and detecting the pressure change, and the detection demolding mechanism is used for pulsing high-speed gas into the pressure measurement micro-holes after the pressure measurement is completed and it is determined that the processed panel has no rebound signs; a limiting strip is arranged on one side of the lower die, and an elastic material pressing frame is arranged on the side of the upper die far from the limiting strip; when the upper die and the lower die approach the die, the material pressing frame presses the flat end surface of the processed panel to make the other end abut against the lower edge of the limiting strip, and the whole processed panel is pre-bent and adhered to the lower die. The rebound of the processed panel can be detected through the detection demolding mechanism, efficient demolding is realized, and automatic pre-bending and positioning before punch are realized through the limiting strip and the material pressing frame.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of metal stamping equipment, and in particular to a stamping detection device for preparing a steel garbage can. BACKGROUND

[0002] A garbage can is generally supported by plastic or metal and used for carrying garbage. For a large-size garbage can, such as a sanitation garbage can, the garbage can is generally made of thick-walled galvanized steel plate and is stamped and welded, has a long service life, and is low in cost. Taking an outdoor sanitation hook-arm garbage can as an example, the garbage can usually comprises a bottom plate, two end plates and a panel with an arc corner, and a garbage throwing opening is arranged at the arc corner on each side of the panel, and in order to improve the strength of the garbage can as a whole, stamping reinforcement is usually performed on different parts of each plate, and the stamping reinforcement can be integrally formed during stamping of each plate.

[0003] In the related art, a garbage can stamping die assembly is disclosed in Chinese Patent Application No. CN201711344798.1, which comprises a lower die seat, a lower die, an upper die seat, an upper die, a slope slide and a weighing platform. The lower die is fixedly installed on the lower die seat. The lower die seat is further provided with a guide rod. The upper die seat is guided by the guide rod relative to the lower die seat. The upper die seat is provided with the upper die. The upper die is fixed to the upper die seat by a spring guide column. The upper die is internally provided with a cavity. One end of the spring guide column is fixed to the upper die seat, and the other end of the spring guide column extends into the cavity of the upper die. The cavity is further provided with a stamping head. The spring guide column pushes the stamping head to extend out of the circular hole and into the die cavity on the lower die. The stamping head and the inner wall of the upper die are further provided with a return spring for the stamping head to rebound into the cavity. The slope slide is further arranged on one side of the lower die. The parts on the lower die slide to the weighing platform along the slope slide. The weighing platform is an electronic weighing device. The air pressure channel is further arranged 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 of the air pressure channel is connected with an air pressure source.

[0004] However, in actual production, considering the manufacturing cost of the die, the panel with the arc corner on each side is generally stamped and processed symmetrically, and then spliced and welded. Such a single-sided panel comprises a 180° arc corner part and a flat part. In the stamping process, the arc corner of the arc corner part on the single-sided panel needs to be ensured to be always in line with the design, otherwise the problem of misalignment with the end plate may occur. However, in the process of stamping the thick steel plate, stamping rebound often occurs, which causes the thick steel plate to fail to be well fitted with the profiling contour of the lower die. If the stamping rebound is not detected in time, subsequent rework will be caused, and the overall processing efficiency will be affected. Moreover, due to the stamping operation, the large-area panel is clamped in the stamping die after being stamped, which affects the stripping efficiency. SUMMARY

[0005] In order to improve the problem that a large-area panel cannot be detected in time after stamping and the demolding efficiency is low, the application provides a stamping detection device for preparing a steel garbage can.

[0006] The stamping detection device for preparing a steel garbage can provided by the application adopts the following technical scheme:

[0007] The stamping detection device for preparing a steel garbage can comprises an upper die, a lower die and a lifting assembly for lifting the upper die, the lower die is provided with a plurality of pressure measuring micro-holes at the corners of the rib part, and a detection demolding mechanism is arranged outside the lower die for passing pressurized gas into the pressure measuring micro-holes after stamping and detecting the pressure change, and for pulsing high-speed gas into the pressure measuring micro-holes after the pressure measurement is completed and it is determined that the panel to be processed has no rebound.

[0008] A limiting strip is arranged on one side of the lower die, and a material pressing frame is elastically arranged on the side of the upper die away from the limiting strip; when the upper die and the lower die approach the die closing, the material pressing frame presses the flat end surface of the panel to be processed to make the other end abut against the lower edge of the limiting strip, and the panel to be processed is pre-bent and attached to the lower die.

[0009] Further, the detection demolding mechanism comprises:

[0010] A branch air pipe in communication with the pressure measuring micro-holes;

[0011] A main air pipe in communication with a plurality of branch air pipes;

[0012] A pressure maintaining cabin in communication with the main air pipe at one end and connected with a gas conveying pipe in communication with an external high-pressure gas source at the other end;

[0013] A pressurizing valve arranged on the gas conveying pipe;

[0014] A pressure measuring valve arranged on the main air pipe;

[0015] A gas pressure sensor arranged on the pressure maintaining cabin; and

[0016] A main controller configured to:

[0017] During pressure measurement, the pressure measuring valve is controlled to be opened and the pressurizing valve is controlled to be closed, and if the pressure drop amplitude detected by the gas pressure sensor is greater than a set value, the lifting assembly is controlled to work for secondary stamping; and

[0018] After pressure measurement, if the pressure drop amplitude detected by the gas pressure sensor meets the set value, the pressurizing valve is controlled to be opened to pressurize the pressure maintaining cabin, and the pressure measuring valve is controlled to be pulsed to open and close to make the pressure measuring micro-holes pulse to spray gas flow to promote the demolding of the panel to be processed.

[0019] Furthermore, the overall control is 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 holding chamber reaches the set value, and then control the pressurizing valve to close.

[0020] Furthermore, the branch air pipe is equipped with a branch solenoid valve, and the main control is also configured to control multiple branch solenoid valves to open alternately when the pressurization valve is opened after pressure measurement.

[0021] Furthermore, the number of branch solenoid valves is greater than two and less than or equal to the number of branch air pipes, and the pressure measuring micro-holes corresponding to the simultaneously opened branch solenoid valves are distributed on the diagonal of the lower mold or on the diagonal of the punching part of the panel to be processed.

[0022] Furthermore, the pressure rack includes:

[0023] Two inclined supports are symmetrically arranged around the center line of the upper mold, and their upper ends are hinged to the upper mold.

[0024] A sliding shaft is fixed to the lower end of the inclined bracket, and its axis is perpendicular to the straight part of the panel to be processed.

[0025] A concave wheel is slidably sleeved on the sliding shaft and used to engage the flat end face of the panel to be processed.

[0026] An elastic component is used to drive the two inclined supports closer together.

[0027] Furthermore, an electromagnet is provided on one end of the sliding shaft and one of the concave wheels, and a permanent magnet is provided on the other end; a return spring sleeved on the sliding shaft is provided between the other end of the sliding shaft and the concave wheel.

[0028] The main controller is also configured to: after pressure measurement, if the pressure drop detected by the air pressure sensor meets the set value, control the two electromagnets to alternately turn on and off or alternately change the direction of the input current, so that the two concave wheels drive the flat end face of the panel to be processed to rotate horizontally alternately.

[0029] Furthermore, before the main controller controls the electromagnet to work, it first controls the lifting assembly to drive the upper mold to a set position. At this set position, the flat end face of the panel to be processed is engaged on the concave wheel, and the elastic component between the two inclined supports is in a state of tensile deformation.

[0030] Furthermore, multiple magnets are embedded in the inner wall of the lower mold near the limiting strip, and the multiple magnets are spaced apart along the length of the limiting strip.

[0031] Furthermore, the lower mold is open on one side corresponding to the arc corner end face of the panel to be processed.

[0032] In summary, the beneficial technical effects of the present application are:

[0033] 1. After stamping, high-pressure gas in the pressure maintaining chamber is sprayed from multiple pressure measuring micro-holes to the corners of the part to be processed, once the panel rebounds, there must be a gap between the panel and the inner wall of the lower mold, which reduces the pressure in the pressure maintaining chamber and is detected by the pressure sensor, thereby determining whether the panel rebounds after stamping and timely moving the upper mold down for secondary stamping to repair, greatly saving the time-consuming of subsequent detection process and the need for secondary positioning, which can significantly improve the processing efficiency of the panel to be stamped;

[0034] 2. By elastically setting a pressure frame on the upper mold and a limiting strip on the opposite side of the lower mold, when the upper mold moves down, the pressure frame pushes the panel down, and the lower part of the panel is attached to the lower mold to complete the pre-bending, which can greatly improve the stamping efficiency; and during the process of closing the upper and lower molds to complete the stamping, the elastically set pressure frame always elastically pushes the panel, which can ensure the accurate positioning of the panel before stamping, effectively avoid the drift of the panel during stamping, ensure the accuracy of stamping, and also does not need to set a complex positioning module or use manual pressure.

[0035] 3. If the total controller determines that the panel has not rebounded, by opening the pressure valve to pressurize the pressure maintaining chamber, and then making the pressure measuring micro-holes pulse spray high-pressure high-speed airflow to the lower end surface of the panel, the panel can be separated from the lower mold under the impact of the airflow, thereby facilitating demolding; by setting a branch electromagnetic valve, multiple pressure measuring micro-holes can alternately pulse spray high-speed airflow, which can achieve the shaking effect of the panel in the lower mold, thereby promoting the demolding efficiency of the clamped panel in the lower mold;

[0036] 4. By sliding the recessed wheels on the pressure frame on the slide shaft, and setting electromagnets and permanent magnets, controlling the two electromagnets to alternately turn on and off or alternately change the input current direction, so that the magnetic repulsion force between the electromagnets and the corresponding permanent magnets alternately increases or returns to zero, or alternately generates magnetic repulsion or magnetic attraction, the two recessed wheels can alternately slide on the corresponding slide shaft in opposite directions, and then the recessed grooves on the recessed wheels can drive the flat end surface of the panel to alternately twist horizontally, achieving the micro-shaking effect of the arc corner part of the panel in the lower mold, and cooperating with the micro-shaking effect of the arc corner part in the lower mold formed by the high-speed airflow pulse sprayed by multiple pressure measuring micro-holes, which can promote the separation of the stamping part on the panel from the lower mold, and also can promote the efficient demolding of the panel after stamping. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1is a schematic diagram of the overall structure of the upper die and the lower die of the embodiment of the present application when the upper die and the lower die are not closed;

[0038] Figure 2 is a schematic diagram of the overall structure of the upper die and the lower die of the embodiment of the present application when the upper die and the lower die are closed;

[0039] Figure 3 is a schematic diagram of the sectional structure of the embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the sectional structure of the embodiment of the present application; Figure 3 is a partial enlarged schematic diagram of part A of the embodiment of the present application;

[0041] Figure 5 is a partial enlarged schematic diagram of part B of the embodiment of the present application. Figure 1

[0042] BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 1. upper die;

[0044] 2. lower die; 21, pressure measuring micro hole; 22, limiting strip; 23, magnet;

[0045] 3. press frame; 31, inclined support; 32, sliding shaft; 33, concave wheel; 34, elastic assembly; 35, electromagnet; 36, permanent magnet; 37, return spring;

[0046] 41, branch air pipe; 42, total air pipe; 43, pressure maintaining cabin; 44, gas conveying pipe; 45, pressure increasing valve; 46, pressure measuring valve; 47, air pressure sensor; 48, branch electromagnetic valve;

[0047] 5. panel to be processed; 51, arc corner part; 52, flat part. DETAILED DESCRIPTION

[0048] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] ​The garbage can panel processed by the application is divided into two single-sided panels by symmetric division, each single-sided panel includes an arc corner part 51 of 180° and a flat part 52, and the overall shape is similar to a "J" shape. The arc corner part 51 corresponds to the front or rear face of the garbage can, and the free end is used for welding with the bottom plate of the garbage can; the flat part 52 corresponds to part of the top of the garbage can, and after the two single-sided panels are matched, the two flat parts 52 are welded to form a complete garbage can top. When stamping is performed, mainly the arc corner part 51 needs to be stamped and shaped, and the ribs are punched and the garbage throwing opening is cut out, so the positioning of the panel 5 to be processed is particularly important during processing. However, the panel has a large area, and it takes a long time to adjust the positioning, and the rib part after stamping is prone to poor adhesion and rebound; and when demolding subsequently, the panel rib part is tightly clamped with the lower die, and the traditional lifting demolding method is easy to cause the arc corner part 51 to deform, affecting the processing quality and processing efficiency. Considering the above problems, the application is filed.

[0050] The embodiment of the application discloses a stamping detection device for preparing a steel garbage can. Figure 1 、 Figure 2 and Figure 3 which comprises an upper die 1, a lower die 2 and a lifting assembly for driving the upper die 1 to lift, and the lower die 2 is provided with an opening on one side corresponding to the arc corner end face of the panel 5 to be processed, so as to facilitate the feeding and discharging of the large-area panel from the opening. The sliding structure of the upper die 1 and the lifting assembly are prior art, and those skilled in the art can realize them without further description.

[0051] The lower die 2 is provided with a plurality of pressure measuring micro holes 21 at the corners corresponding to the rib part, and the outer surface of the lower die 2 is provided with a detection demolding mechanism for passing pressurized gas into the pressure measuring micro holes 21 after stamping and detecting the pressure change, and pulsing high-speed gas into the pressure measuring micro holes 21 after the detection is completed and it is determined that the panel 5 to be processed has no rebound. Wherein, determining whether the panel 5 to be processed has rebound means that the pressure drop detected after the pressurized gas is passed in is lower than the set value, which is considered to have good adhesion and no rebound, and the pressure drop detected is higher than the set value, which is considered to have poor adhesion and rebound.

[0052] A limiting strip 22 is arranged on one side of the lower die 2, and the limiting strip 22 is arranged along the arc corner axis of the panel 5 to be processed, and the upper die 1 is elastically provided with a pressure frame 3 away from the limiting strip 22; when the upper die 1 and the lower die 2 approach the die, the pressure frame 3 presses the flat part 52 end face of the panel 5 to be processed to make the other end abut against the lower edge of the limiting strip 22, and pre-bends and adheres the whole panel 5 to be processed in the lower die 2. Figure 4 According to the application, a plurality of magnets 23 are embedded in the inner wall of the lower die 2 close to the limiting strip 22, and the plurality of magnets 23 are arranged along the length direction of the limiting strip 22.

[0053] According to the application,Figure 3 The demolding detection mechanism includes:

[0054] Branch trachea 41 is connected to pressure measuring micro-hole 21;

[0055] The main trachea 42 is connected to multiple branch tracheas 41;

[0056] The pressure chamber 43 has one end connected to the main air pipe 42 and the other end connected to the air supply pipe 44 connected to an external high-pressure air source;

[0057] A pressurization valve 45 is installed on the gas supply pipe 44;

[0058] Pressure testing valve 46 is installed on the main gas pipe 42. Both the pressurizing valve 45 and the pressure testing valve 46 can be solenoid valves. The pressure testing valve 46 can also be connected to a pulse relay or directly set as a pulse solenoid valve.

[0059] The pressure sensor 47 is located on the pressure chamber 43 and is used to detect changes in air pressure in the pressure chamber 43. It can be a pressure detector.

[0060] And the main controller is configured as follows:

[0061] During pressure testing, the pressure testing valve 46 is opened and the pressurization 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 a secondary pressurization.

[0062] After pressure measurement, if the pressure drop detected by the air pressure sensor 47 meets the set value, the pressurization 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 micro-hole 21 pulses out airflow to promote the demolding of the panel 5 to be processed.

[0063] Furthermore, it should be specifically noted that the pressure test is performed after the upper mold 1 and lower mold 2 have closed and stamped, and the lifting assembly drives the upper mold 1 to a set position. At this set position, the flat end face 52 of the panel to be processed 5 remains in close contact with the pressure holder 3, and the panel to be processed 5 in the upper mold 1 and lower mold 2 are completely detached. Moreover, the air pressure set in the pressure holding chamber 43 during the pressure test is insufficient to detach the panel to be processed 5 from the lower mold 2; it can only penetrate into any possible gaps between the panel to be processed 5 and the lower mold 2.

[0064] Thus, when stamping the panel of the garbage can, the cut panel 5 is first pushed into the lower die 2 through the open side of the lower die 2, ensuring that the end of the panel 5 is in close contact with the inner wall of the closed end of the lower die 2, and then the end of the panel 5 is aligned with the lower side of the limiting strip 22 of the upper die 2, and the other end of the panel 5 extends out of the lower die 2; then the upper die 1 is driven downward by the lifting assembly, and the end of the panel 5 outside the lower die 2 is clamped into the pressing frame 3; then the upper die 1 is continuously driven downward by the lifting assembly, and as the upper die 1 gradually moves downward, the panel 5 is pushed downward by the pressing frame 3, and the lower part of the panel 5 is bent and fitted in the lower die 2, which can greatly improve the stamping efficiency.

[0065] Moreover, during the process of closing the upper die 1 and the lower die 2 to complete the stamping, the elastically arranged pressing frame 3 always elastically pushes the panel 5, which can ensure the accurate positioning of the panel 5 before stamping, effectively avoid the possible drift of the panel 5 during stamping, ensure the stamping accuracy, and simplify the processing procedure of the "J" shaped panel 5 without the need for complex positioning modules or manual pressing, which is suitable for continuous production in factories.

[0066] When the stamping is completed, the lifting assembly drives the upper die 1 to lift to a set position, at which time the panel 5 in the upper die 1 and the lower die 2 is separated, and the pressing frame 3 keeps the elastic pressing of the panel 5, but the elastic force is weakened after the upper die 1 is lifted, so it will not interfere with the possible warping deformation of the panel 5 after springback.

[0067] Thus, when the total controller controls the pressure measuring valve 46 to open, the high-pressure gas in the pressure maintaining cabin 43 flows through the total gas pipe 42 to the multiple branch gas pipes 41, and is sprayed from the multiple pressure measuring micro-holes 21 to the corners of the stamping rib part of the panel 5. Once the panel 5 and the lower die 2 are not well fitted and spring back, there must be a gap between the panel 5 and the inner wall of the lower die 2, which reduces the gas pressure in the pressure maintaining cabin 43 and is detected by the gas pressure sensor 47, so that it can be determined whether the panel 5 after stamping has springback, and the upper die 1 is timely driven to move downward for secondary stamping to repair, which greatly saves the time-consuming of subsequent detection process and the need for secondary positioning, and can significantly improve the processing efficiency of the panel 5.

[0068] If the pressure drop detected by the pressure sensor 47 is within the set allowable range, it means that the panel 5 to be processed is well fitted and no springback phenomenon occurs, and the stamping quality is good. At this time, the total controller controls the pressurizing valve 45 to open, so that the pressure in the pressure maintaining cabin 43 is increased to be greater than the pressure set in the pressure maintaining cabin 43 when the pressure is measured. Then, the total controller controls the pressure measuring valve 46 to be pulsed opened and closed, so that the pressure measuring micro-holes 21 pulse jet higher pressure and high-speed airflow to the lower end surface of the panel 5 to be processed. The high-speed airflow can promote the separation of the panel 5 to be processed from the lower die 2 under the impact of the airflow, thereby facilitating the demolding. Moreover, the panel 5 to be processed is provided with the pressure measuring micro-holes 21 at the rib parts, and the high-speed airflow blows on the lower end surface of the panel 5 to be processed, so that the upward pushing force on the panel 5 to be processed is more balanced, and no deformation caused by local excessive pressure occurs, and the demolding effect is better.

[0069] Further, the total controller is further configured to: before each pressure measurement, control the pressure measuring valve 46 to be closed, and control the pressurizing valve 45 to be opened until the pressure sensor 47 detects that the pressure in the pressure maintaining cabin 43 reaches a set value, and then control the pressurizing valve 45 to be closed, so as to ensure the accuracy of each pressure measurement.

[0070] Moreover, referring to Figure 3 , the branch air pipe 41 is provided with a branch electromagnetic valve 48, and the total controller is further configured to control the branch electromagnetic valves 48 to be alternately opened when the pressurizing valve 45 is controlled to be opened after the pressure measurement. The number of the branch electromagnetic valves 48 is greater than two and less than or equal to the number of the branch air pipes 41, and the pressure measuring micro-holes 21 corresponding to the branch electromagnetic valves 48 that are opened at the same time are distributed on opposite corners of the lower die 2 or the rib parts of the panel 5 to be processed.

[0071] In this way, the multiple pressure measuring micro-holes 21 can alternately pulse jet high-speed airflow, and the panel 5 to be processed can achieve the shaking effect in the lower die 2, thereby promoting the demolding efficiency of the clamped panel 5 to be processed in the lower die 2.

[0072] In addition, referring to Figure 1 , Figure 2 and Figure 5 , the above-mentioned pressure material frame 3 comprises:

[0073] The inclined support 31 is provided with two in the median line of the upper die 1, and the upper end thereof is hinged to the upper die 1.

[0074] The sliding shaft 32 is fixedly connected to the lower end of the inclined support 31, and the axial direction thereof is perpendicular to the flat part 52 of the panel 5 to be processed.

[0075] The concave wheel 33 is sleeved on the slide shaft 32 and is used for clamping the end surface of the flat part 52 of the panel 5 to be processed. In the specific configuration, a plurality of slide shafts 32 and corresponding concave wheels 33 can be arranged at the lower end of the inclined support 31 to increase the effective contact area between the pressing frame 3 and the panel 5 to be processed and reduce the local damage to the panel 5 to be processed. In this embodiment, one set of slide shaft 32 and concave wheel 33 is arranged at the lower end of the inclined support 31, which is only used to explain the technical scheme of the application and does not represent the limitation of the technical features in the application.

[0076] The elastic assembly 34 is used to drive the two inclined supports 31 to approach each other, and specifically includes at least two tension springs, the two ends of the tension springs being connected with the side edges of the two inclined supports 31 respectively.

[0077] Therefore, when the pressing frame 3 moves downward with the upper die 1, the plurality of concave wheels 33 on the two inclined supports 31 are pressed on the upper end surface of the flat part 52 of the panel 5 to be processed. With the gradual downward movement of the upper die 1, the two inclined supports 31 are flipped in the direction away from each other, the elastic assembly 34 is stretched to produce deformation, and the concave wheels 33 roll on the upper end surface of the flat part 52 of the panel 5 to be processed, which can realize the elastic pressing effect on the panel 5 to be processed and will not cause obvious sliding damage to the upper end surface of the flat part 52 of the panel 5 to be processed.

[0078] And to further improve the demolding effect on the panel to be processed.

[0079] In another possible embodiment, an electromagnet 35 is arranged on one end of the slide shaft 32 and a permanent magnet 36 is arranged on one of the concave wheels 33, and a reset spring 37 sleeved on the slide shaft 32 is arranged between the other end of the slide shaft 32 and the concave wheel 33, which is used to realize the reset effect of the concave wheel 33 after moving on the slide shaft 32. In this embodiment, the electromagnet 35 is installed on one end of the slide shaft 32, and the permanent magnet 36 is installed on the end surface of the concave wheel 33.

[0080] The total controller is also configured to: after pressure measurement, if the pressure drop amplitude detected by the air pressure sensor 47 meets the set value, control the two electromagnets 35 to alternately turn on and off or alternately change the input current direction, so that the two concave wheels 33 drive the end surface of the flat part 52 of the panel 5 to be processed to alternately twist horizontally; or, if the panel 5 to be processed cannot be smoothly demolded after the high-speed airflow is sprayed by the pressure measuring micro-hole 21, the two electromagnets 35 are controlled to alternately turn on and off or alternately change the input current direction, so that the two concave wheels 33 drive the end surface of the flat part 52 of the panel 5 to be processed to alternately twist horizontally, and the micro-shaking effect of the arc corner part 51 of the panel 5 to be processed in the lower die 2 is realized.

[0081] Moreover, before the electromagnet 35 is controlled to work, the general controller controls the lifting assembly to drive the upper die 1 to lift to a set position, at which the end face of the flat portion 52 of the panel 5 to be processed is clamped on the concave wheel 33 and the elastic assembly 34 between the two inclined supports 31 is in a tensile deformation state.

[0082] Thus, when the upper die 1 is driven by the lifting assembly to move downward, the end face of the flat portion 52 of the panel 5 to be processed is clamped in the groove of the concave wheel 33, and as the upper die 1 continues to move downward, the two concave wheels 33 roll away from each other on the end face of the flat portion 52, at which time the two inclined supports 31 are turned away from each other, and the elastic assembly 34 arranged therebetween is stretched to produce a deformation, so as to exert an elastic force downward on the flat portion 52 of the panel 5 to be processed.

[0083] When the pressing frame 3 needs to intervene in the demolding process, the general controller controls the two electromagnets 35 to alternately turn on and off or alternately change the direction of the input current, so that the magnetic repulsion force between the electromagnet 35 and the corresponding permanent magnet 36 alternately increases or returns to zero, or alternately generates magnetic repulsion or magnetic attraction, so that the two concave wheels 33 alternately slide on the corresponding slide shaft 32 in opposite directions, and then drive the end face of the flat portion 52 of the panel 5 to be processed to alternately twist horizontally, so as to achieve the micro-vibration effect of the arc corner portion 51 of the panel 5 to be processed in the lower die 2, which cooperates with the micro-vibration effect of the arc corner portion 51 in the lower die 2 formed by the pulsed high-speed airflow of the plurality of pressure measuring micro-holes 21, so as to promote the separation of the punching rib portion of the panel 5 to be processed from the lower die 2, and also promote the efficient demolding of the panel 5 to be processed after stamping.

[0084] It should be particularly noted that when the plurality of concave wheels 33 on the two inclined supports 31 drive the end face of the flat portion 52 of the panel 5 to be processed to alternately twist horizontally, the twisting amplitude should not cause local distortion to the end face of the flat portion 52, and is generally limited to within 5 times the thickness of the panel to be processed, that is, the total stroke of the sliding of the concave wheel 33 on the slide shaft 32 from the compression return spring 37 to the limit position to be attached to the electromagnet 35 is less than 5 times the thickness of the panel to be processed.

[0085] Unless otherwise defined, technical terms or scientific terms used in the present application shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Unless otherwise defined, the terms "first", "second" or "third" and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a sequential or chronological order. The terms "one", "another", "an" or "some" as well as similar referents in the context of describing the specification and claims are to be construed to be open-ended, i.e., to cover both singular and plural referents unless otherwise indicated. The terms "including", "containing" or "comprising" and the like are not intended to exclude other integers or steps, but to "include" or "comprise" other integers or steps unless otherwise indicated. The terms "connected", "coupled" or "pathway" are not restricted to direct connections, couplings or pathways but include indirect connections, couplings or pathways unless otherwise indicated. The terms "above", "below", "left", "right" and the like are only used to express relative positions such that if an absolute position of a described object is changed, the relative positions can also be changed accordingly.

[0086] The above are only preferred embodiments of the present application, not intended to limit the protection scope of the present application, therefore: any equivalent changes made according to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A stamping testing device for manufacturing steel trash cans, comprising an upper mold, a lower mold, and a lifting assembly for driving the upper mold to rise and fall, characterized in that, The lower die has multiple pressure measuring microholes at the corners of the corresponding punching ribs. The lower die is provided with a detection and demolding mechanism for introducing pressurized gas into the pressure measuring microholes after the stamping is completed and detecting the gas pressure change, and for pulsely introducing high-speed gas into the pressure measuring microholes after the pressure test is completed and it is determined that the panel to be processed has no signs of springback. A limit strip is provided on one side of the lower mold, and a pressure frame is elastically provided on the side of the upper mold away from the limit strip. When the upper mold and the lower mold are close to closing, the pressure frame presses the flat end face of the panel to be processed so that its other end abuts against the lower edge of the limit strip, and pre-bends the entire panel to be processed and fits it into the lower mold.

2. The stamping testing device for manufacturing steel trash cans according to claim 1, characterized in that, The detection and demolding mechanism includes: A branch trachea is connected to the pressure measuring micropore; The main trachea is connected to the plurality of said branch trachea; The pressure chamber has one end connected to the main gas pipe and the other end connected to a gas supply pipe that is connected to an external high-pressure gas source; A pressure valve is installed on the gas supply pipe; A pressure testing valve is installed on the main gas pipe; A pressure sensor is installed on the pressure chamber; and The main controller is configured as follows: During pressure measurement, the pressure measuring valve is opened and the pressurizing valve is closed. If the pressure drop detected by the air pressure sensor is greater than a set value, the lifting assembly is controlled to perform a secondary pressurization. After pressure measurement, if the pressure drop detected by the pressure sensor meets the set value, the pressurization valve is opened to pressurize the pressure holding chamber and the pressure measuring valve is pulsed to open and close so that the pressure measuring micro-hole pulse jets out airflow to promote the demolding of the panel to be processed.

3. The stamping testing device for manufacturing steel trash cans according to claim 2, characterized in that, The main controller is also configured to: before each pressure measurement, control the pressure measuring valve to close and control the pressurizing valve to open until the pressure sensor detects that the pressure in the pressure chamber has reached the set value, and then control the pressurizing valve to close.

4. The stamping testing device for manufacturing steel trash cans according to claim 2, characterized in that, The branch air pipe is equipped with a branch solenoid valve, and the main controller is also configured to control multiple branch solenoid valves to open alternately when the pressurization valve is opened after pressure measurement.

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

6. A stamping testing device for manufacturing steel trash cans according to any one of claims 2-5, characterized in that, The pressing frame includes: Two inclined supports are symmetrically arranged around the center line of the upper mold, and their upper ends are hinged to the upper mold. A sliding shaft is fixed to the lower end of the inclined bracket, and its axis is perpendicular to the straight part of the panel to be processed. A concave wheel is slidably sleeved on the sliding shaft and used to engage the flat end face of the panel to be processed. An elastic component is used to drive the two inclined supports closer together.

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

8. A stamping testing device for manufacturing steel trash cans 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 a set position. At this set position, the flat end face of the panel to be processed is engaged on the concave wheel, and the elastic component between the two inclined supports is in a state of tensile deformation.

9. A stamping testing device for manufacturing steel trash cans according to claim 1, characterized in that, Multiple magnets are embedded in the inner wall of the lower mold near the limiting strip, and the multiple magnets are spaced apart along the length of the limiting strip.

10. A stamping testing device for manufacturing steel trash cans according to claim 1, characterized in that, The lower mold is open on one side corresponding to the arc corner end face of the panel to be processed.

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