Two-stage punching device for maintaining continuity of coating

Abstract

The invention relates to a two-stage punching device for maintaining continuity of a coating, which comprises a support, and the support is provided with a cutter for cutting off the coating at a punching position; the punch is used for punching the coating plate of which the coating is cut off; the punching oil cylinder is used for driving the cutter and the punch to lift; the conversion assembly is used for driving the cutter and the punch to move, so that the cutter and the punch are alternately aligned to the punching position; the supporting plate is horizontally arranged and is positioned below the cutter; the supporting column is located below the supporting plate and is driven by a lifting oil cylinder to ascend and descend; when the cutter works, the upper end of the supporting column is inserted into the avoiding hole, and the upper end face of the supporting column is flush with the upper end face of the supporting plate. When the punch works, the supporting column is far away from the coating plate. A cylindrical cutter is arranged, so that a coating at a punching position is cut off before punching; therefore, when the punch is used for punching, the coating is in a cut-off state and cannot be broken due to stress concentration in the punching process, so that the problem that the coating is broken in the traditional punching process is effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of punching devices, in particular to a two-stage punching device for maintaining coating continuity. Background Art

[0002] The traditional coated sheet punching process usually adopts the coating-up method, that is, the punch punches the coated sheet from above. In this process, the coated sheet will bend downward first to adapt to the shape and punching force of the punch. As the punch presses down, the coating material on the outside of the punch will extend with the deformation of the sheet. This extension is a natural reaction of the coating material during the punching process, which is designed to maintain consistency with the substrate.

[0003] However, when punching, the extended coating material breaks (ref. Fig.13 ). This is because the stress concentration generated during the blanking process and the inherent characteristics of the coating material cause it to be unable to withstand excessive deformation and break. More seriously, the extended coating will shrink rapidly when the pulling force is suddenly lost. This rapid shrinkage not only exacerbates the fracture of the coating, but may also weaken the bonding force between the coating and the substrate, and even cause the coating to separate from the substrate (refer to Fig.14 ).

[0004] The phenomenon of coating breaking or separation from the substrate not only affects the appearance quality of the coated plate, but also seriously weakens its anti-corrosion performance. The coating damage at the punching point makes the substrate directly exposed to the environment, which is easily corroded by corrosive media such as moisture and oxygen, causing the plate at the punching point to rust easily. This not only shortens the service life of the coated plate, but also increases maintenance costs and replacement frequency.

[0005] Therefore, how to improve the punching process of the coated plate to avoid the coating from breaking or separating from the plate and improve the quality and service life of the product has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0006] In order to solve the technical problems in the background technology, the present invention discloses a two-stage punching device for maintaining coating continuity.

[0007] The present invention provides a two-stage punching device for maintaining coating continuity, which is used for punching a coated plate. The coated plate is composed of a substrate and a coating covering one side of the substrate, and includes a bracket, on which are provided: The cutter is cylindrical, and a concave receiving cavity is provided at the lower end thereof, so that the blade at the lower end of the cutter forms a V shape, and the inner side surface of the blade forms an inclined surface inclined upward, which is used to cut off the coating at the punching position; A punch is used to punch the coated plate from which the coating has been cut off, so that a punch hole is formed; Stamping cylinder, used to drive the cutter and punch to rise and fall; A conversion assembly is used to drive the cutter and the punch to move so that they are alternately facing the punching hole; The support plate is arranged horizontally and is located below the cutter. The support plate is provided with an avoidance hole with the same diameter and axis as the punching hole. The support column is located below the support plate and is driven to rise and fall by a lifting cylinder; when the cutter is working, the upper end of the support column is inserted into the avoidance hole, and the upper end surface of the support column is flush with the upper end surface of the support plate; when the punch is working, the support column is away from the coated plate.

[0008] The beneficial effects of the above arrangement are: 1. The present invention cuts off the coating at the punching location before punching by setting a cylindrical cutter; thus, when the punch is punching, the coating is already in a cut-off state and will not break due to stress concentration during the punching process, thereby effectively solving the problem of coating breakage in the traditional punching process; 2. After the cutter cuts off the coating, the punch punches again, thereby avoiding the phenomenon that the coating is separated from the substrate due to rapid shrinkage during the punching process; 3. Since the cutter forms a downward pressure on the coated plate when cutting, the support column supports the coated plate when the cutter is cutting, thereby avoiding the phenomenon that the coated plate is sunken downward when cutting; 4. The cutter and the punch work alternately under the action of the conversion assembly, The process of alternately disassembling and assembling the cutter and the punch is avoided, making the punching process more efficient and stable; 5. The aperture of the avoidance hole is set to be consistent with the aperture of the punch, so that when the punch is punching, the part around the punch will not sink downward, keeping the structure of the coated plate stable; 6. The design of the V-shaped blade makes the cutting edge sharper, and can accurately cut off the coating material before punching. This precise cutting method reduces damage to the coating during the cutting process and avoids unnecessary cracking or tearing of the coating, thereby ensuring the integrity of the coating; 7. Compared with blades of other shapes, the V-shaped blade can better disperse stress during cutting and reduce stress concentration, which helps to reduce the risk of coating breakage due to excessive stress during the cutting process.

[0009] The conversion assembly specifically includes: a horizontally arranged tool mounting plate, a cutter and a punch are mounted on the lower side of the tool mounting plate; a lifting frame driven by a stamping cylinder is provided on the bracket, and a linear guide is installed on the lower side of the lifting frame; the upper end surface of the tool mounting plate is fixedly connected to a slider in the linear guide; the tool mounting plate is driven to move by a horizontal drive assembly.

[0010] Since the coating is ductile, the coating will still be stretched when the cutter cuts downwards. Based on this, further improvements are as follows: the outer side of the cutter is sleeved with a pressing sleeve, whose inner side wall fits the outer side wall of the cutter; the pressing sleeve is elastically connected to the tool mounting plate through a tension spring, so that it can be displaced in the vertical direction; when the cutter cuts the coated plate, pressure is generated between the pressing sleeve and the coated plate. With this arrangement, when the cutter cuts downwards, the coating around the punching hole is pressed by the pressing sleeve, so that no stretching occurs.

[0011] When the punch is punching, the stress-bearing end face of the coated plate will be plastically deformed under pressure, so that the upper edge of the punch hole will have a certain curvature, forming a curved surface. The curved surface will separate from the coating and will easily rust when exposed outdoors. Based on this, a further improvement is that the lower end of the inner hole of the pressing sleeve is provided with an inner chamfer. The setting of the inner chamfer ensures that the coating within the range of the inner chamfer will not be subjected to the pressure of the pressing sleeve. When the curved surface is formed, the coating within the range of the inner chamfer will follow the deformation and remain attached to the curved surface. Moreover, the range of the curved surface is small, and the deformation amplitude of the coating is also small, so it will not break or separate from the substrate.

[0012] The conventional connection structure of the pressing sleeve and the tension spring is: a connecting shaft is set, the lower end of which is fixedly connected to the pressing sleeve, and the upper end passes through the tool mounting plate upward and is locked by a nut; the tension spring is sleeved on the connecting shaft, the upper end of the tension spring abuts against the tool mounting plate, and the lower end abuts against the pressing sleeve; when the pressing sleeve encounters resistance when descending, the connecting shaft will move upward; in this structure, there needs to be enough space between the tool mounting plate and the lifting frame so that the connecting shaft will not be blocked when moving upward, which will cause the height of the present invention to be higher and the cost to increase, and it will also occupy the space between the tool mounting plate and the lifting frame. When other components need to be installed between the tool mounting plate and the lifting frame, they will be blocked by the connecting shaft. Based on this, a further improvement is that: the outer side wall of the pressing sleeve is provided with two symmetrical, vertically arranged, upwardly opening mounting sleeves, and a telescopic rod is provided in the mounting sleeve; the lower end of the telescopic rod is fixedly connected to the bottom of the mounting sleeve, and the upper end is fixedly connected to the tool mounting plate; the tension spring is provided in the telescopic rod.

[0013] When the cutter and the punch are pressed down, the pressure direction of the stamping oil cylinder is offset from the slider, which will cause uneven force on the tool mounting plate and cause bending. Moreover, the pressure between the slider and the slide rail is large at one end and small at the other end, which will also cause damage to the slider. Furthermore, the pressure generated by the stamping oil cylinder will act on the linear guide rail, making the linear guide rail more susceptible to damage. Based on this, further improvements are as follows: a top column is set at the upper end of the tool mounting plate; the lower end of the top column is fixedly connected to the upper end surface of the tool mounting plate, and the upper end is in contact with the lower end surface of the lifting frame; there are four top columns, two of which are close to the cutter and symmetrically distributed relative to the axis of the cutter, and the remaining two are close to the punch and symmetrically distributed relative to the punch. With this arrangement, the top column becomes a force point and directly transmits the pressure from the lifting frame to the tool mounting plate, which can avoid damage to the linear guide rail due to pressure. Moreover, the setting of the position of the top column ensures that the tool mounting plate is evenly stressed and will not bend.

[0014] When the working positions of the cutter and the punch are switched, the top column will slide between the lifting frame and connect or detach from the lifting frame. Such a setting will not only cause wear, but also when the top column is detached from the lifting frame and then connected to the lifting frame again, it will be blocked by the lifting frame due to the position accuracy. Based on this, further improvements are made: the top column includes a column body, the upper end of the column body is provided with a hemispherical groove with an opening facing vertically upward; a ball with the same diameter is installed in the groove; and the upper end of the ball is in contact with the lifting frame.

[0015] If the lifting cylinder is arranged vertically and directly drives the support column to rise and fall, more vertical space will be occupied, resulting in a higher height of the device of the present invention, and when the cutter is cutting, the support column is easily moved downward by pressure, causing it to lose its supporting function. Based on this, further improvements are: a first guide surface is arranged obliquely relative to the horizontal plane at the lower end of the support column; the lifting cylinder is arranged horizontally, and its driving end is connected to a driving block, and the driving block is provided with a second guide surface with the same slope as the first guide surface; the part of the support column provided with the first guide surface has a radial projection of a right-angled trapezoid; the driving block is a right-angled trapezoid; when the driving block moves toward the support column and the first guide surface and the second guide surface are connected, the support column rises; when the driving block moves toward the support column and moves until the first guide surface and the second guide surface are separated, the upper end surface of the driving block is connected to the lower end surface of the support column, and at this time the upper end surface of the support column is flush with the upper end surface of the support plate.

[0016] In order to improve the stability of the support column lifting, the further design is: a vertically arranged guide cylinder is provided at the lower end of the bracket, and the support column is inserted into the guide cylinder; a U-shaped slot with an opening facing downward is provided at the lower part of the guide cylinder; and the drive block is inserted into the slot. In this arrangement, the guide cylinder is not only used to guide the lifting of the support column, but also to guide the movement of the drive block, making the lifting of the support column more stable.

[0017] When the punch is finished, the part that is cut off from the coated plate will fall on the upper end surface of the guide cylinder, which needs to be manually cleaned before the next operation can be carried out, which will affect the production efficiency. Based on this, further improvements are as follows: the upper end surface of the guide cylinder is arranged at an angle relative to the horizontal plane; the upper end surface of the guide cylinder is also hinged with a cover plate; the cover plate is rotated to block or open the upper end surface of the guide cylinder; when the cover plate is closed to block the upper end surface of the guide cylinder, the cover plate is also arranged at an angle. In this way, the falling cut materials will automatically fall to the outside of the guide cylinder under the guidance of the cover plate, and will not fall on the upper end surface of the guide cylinder, nor will they be stuck at the upper end of the inner hole of the guide cylinder, thereby eliminating manual operation and improving production efficiency.

[0018] The beneficial effects of the present invention are as follows: 1. The present invention cuts off the coating at the punching position before punching by setting a cylindrical cutter; thus, when the punch is punching, the coating is already in a cut-off state and will not break due to stress concentration during the punching process, thereby effectively solving the problem of coating breakage in the traditional punching process; 2. After the cutter cuts off the coating, the punch is punched again, thereby avoiding the phenomenon that the coating is separated from the substrate due to rapid shrinkage during the punching process; 3. Since the cutter forms a downward pressure on the coated plate when cutting, the support column supports the coated plate when the cutter is cutting, thereby avoiding the phenomenon that the coated plate is sunken downward when cutting; 4. The cutter and the punch work alternately under the action of the conversion assembly, The process of alternately disassembling and assembling the cutter and the punch is avoided, making the punching process more efficient and stable; 5. The aperture of the avoidance hole is set to be consistent with the aperture of the punch, so that when the punch is punching, the part around the punch will not sink downward, keeping the structure of the coated plate stable; 6. The design of the V-shaped blade makes the cutting edge sharper, and can accurately cut off the coating material before punching. This precise cutting method reduces damage to the coating during the cutting process and avoids unnecessary cracking or tearing of the coating, thereby ensuring the integrity of the coating; 7. Compared with blades of other shapes, the V-shaped blade can better disperse stress during cutting and reduce stress concentration, which helps to reduce the risk of coating breakage due to excessive stress during the cutting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 is a top view of the present invention; Figure 4 yes Figure 3 Sectional view of AA in the middle; Figure 5 yes Figure 4 Enlarged view of point C in the middle; Figure 6 yes Figure 4 The enlarged view of point D in the middle; Figure 7 yes Figure 3 a cross-sectional view of the middle BB, with the support column in a lowered state; Figure 8 yes Figure 3 A cross-sectional view of the middle BB, wherein the support column is in an ascending state, and the cutter is in contact with the upper end surface of the coated plate, and is in a state of being about to cut; Fig. 9 It is a structural schematic diagram of the guide cylinder; Fig.10 It is a schematic diagram of the structure of the support column; Fig.11 It is the main view of the support column; Fig.12 yes Fig.11 Sectional view of EE; Fig.13 This is a schematic diagram of the coating breaking when punching a conventional coated plate; Fig.14 This is a schematic diagram of the separation of the coating from the substrate during conventional coated sheet punching; Fig.15 It is a schematic diagram of the structure of the cutter of the present invention when shearing the coating; In the figure: 1, bracket; 2, cutter; 3, punching; 4, coating; 5, punch; 6, stamping cylinder; 7, support column; 8, lifting cylinder; 9, tool mounting plate; 10, lifting frame; 11, linear guide rail; 12, pressing sleeve; 13, tension spring; 14, top column; 15, support plate; 16, drive block; 17, guide cylinder; 18, cover plate; 19, linear bearing; 20, seat; 21, knife seat; 22, substrate; 23, coating plate; 24, composite Position spring; 71, first guide surface; 72, inner groove; 73, support block; 101, top plate; 102, bottom plate; 103, pillar; 104, guide column; 121, inner chamfer; 122, mounting sleeve; 123, telescopic rod; 141, column; 142, groove; 143, rolling ball; 151, avoidance hole; 161, second guide surface; 171, slot; 172, positioning block; 173, outer groove; 201, blade; 202, accommodating chamber. DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] like Figure 1-4As shown, the present invention discloses a two-stage punching device for maintaining coating continuity, which is used for punching holes 3 in a coating plate 23. The coating plate 23 is composed of a substrate 22 and a coating 4 covering one side of the substrate 22, and includes a bracket 1. The bracket 1 is provided with a top plate 101, a support plate 15 and a bottom plate 102 arranged in sequence from top to bottom and in a horizontal state. A support 103 is connected between the support plate 15 and the bottom plate 102. The support 103 is four square tubes, and the positions of the support 103 form a rectangle. A guide column 104 is connected between the support plate 15 and the top plate 101. The upper and lower ends of the guide column 104 are provided with thread segments with reduced diameters, so that the root of the thread segment forms a shoulder. The threaded section at the lower end of the guide post 104 is threadedly connected to the support plate 15 and the shoulder abuts against the support plate 15. The threaded section at the upper end of the guide post 104 passes upward through the top plate 101 to the shoulder abutting against the lower end surface of the top plate 101. The nut at the upper end surface of the top plate 101 is threadedly connected to the guide post 104, so that the guide post 104 is installed and fixed, and the top plate 101 and the support plate 15 are connected and fixed. Two nuts are provided at the upper end of each guide post 104 to prevent the nut from loosening.

[0023] The support plate 15 is used to support the coating plate 23, and a avoidance hole 151 is opened at the center thereof, which is coaxial with the punching hole 3 required to be opened on the coating plate 23. Four pressing plates are arranged on the support plate 15, and the center thereof is rotatably connected to the support plate 15 through a rotating shaft, and a bolt is arranged at one end thereof away from the coating plate 23, and the bolt is a handle bolt, and the threaded end thereof passes through the pressing plate downward and is threadedly connected to the support plate 15, so that the other end of the pressing plate presses and fixes the coating plate 23.

[0024] The upper end surface of the top plate 101 is installed with a stamping cylinder 6 with the driving end facing downward. A horizontally arranged lifting frame 10 is arranged between the top plate 101 and the support plate 15, and four linear bearings 19 slidably connected to the guide pillars 104 are installed on the lifting frame 10 to guide the lifting of the lifting frame 10. A connecting seat 20 is arranged on the upper end surface of the lifting frame 10 and is fixed by bolts. The connecting seat 20 is threadedly connected to the piston rod of the stamping cylinder 6, so that the stamping cylinder 6 can drive the lifting frame 10 to move up and down. The lifting frame 10 includes a rectangular frame surrounded by square tubes, and a plurality of vertically staggered reinforcing rods made of square tubes are arranged between the frames. The upper and lower ends of the frame are connected with connecting plates by welding, and the outer side edges of the connecting plates are flush with the outer side edges of the frame. Such a configuration is used to improve the structural strength of the lifting frame 10 and make it less prone to deformation.

[0025] Two symmetrically arranged linear guide rails 11 are installed on the lower side of the lifting frame 10, and a tool mounting plate 9 is fixedly connected to the slider thereof, so that the tool mounting plate 9 can move horizontally. Two spaced tool seats 21 are installed on the lower side of the tool mounting plate 9, which are fixed by bolt connection. The tool seat 21 is provided with threaded holes, and the cutter 2 and the punch 5 are respectively threadedly connected. A horizontal driving assembly is also installed on the lower side of the lifting frame 10, which is used to drive the cutter 2 and the punch 5 to move so that they alternately face the position of the punch hole 3. Moreover, when the cutter 2 is working, the punch 5 will move to the outside of the bracket 1; when the punch 5 is working, the cutter 2 will move to the outside of the bracket 1, so that the cutter 2 and the punch 5 can work stably without being blocked. The horizontal driving assembly can be, but is not limited to, a cylinder, and can also be a linear slide, an electric cylinder, etc. In this embodiment, the horizontal driving component is a rodless cylinder. With such a configuration, when the rodless cylinder drives the tool mounting plate 9 to move, the parts of the rodless cylinder will not exceed the bracket 1 and can be effectively protected by the lifting frame 10 and are not easily damaged.

[0026] The cutter 2 is cylindrical, and a concave trapezoidal accommodation cavity 202 is provided at its lower end, so that the blade 201 at the lower end of the cutter 2 forms a V-shape, and the inner side surface of the blade 201 forms an inclined surface obliquely upward, which is used to cut the coating 4 at the punching hole 3. When the V-shaped blade 201 cuts, the cut coating 4 will bulge upward, and the accommodation cavity 202 provides a space for accommodating the bulging coating 4. In addition, the upper end of the accommodation cavity 202 is also connected to a cylindrical cavity, which further expands the space for accommodating the curved coating 4, and does not cause any obstruction to the cutting of the cutter 2. The V-shaped blade 201 design has the following advantages: 1. The design of the V-shaped blade 201 makes the cutting edge sharper, and can accurately cut the coating 4 material before punching 3. This precise cutting method reduces the damage of the coating 4 during the cutting process and avoids unnecessary cracking or tearing of the coating 4, thereby ensuring the integrity of the coating 4; 2. Compared with blades 201 of other shapes, the V-shaped blade 201 can better disperse stress during cutting and reduce stress concentration, which helps to reduce the risk of the coating 4 breaking due to excessive stress during the cutting process.

[0027] A top column 14 is provided at the upper end of the tool mounting plate 9; the top column 14 includes a column 141, and a hemispherical groove 142 with an opening facing vertically upward is provided at the upper end of the column 141; a ball 143 of the same diameter is installed in the groove 142, and the ball 143 can roll freely, and the upper end of the ball 143 is in contact with the lifting frame 10. The groove 142 is provided in a hemispherical shape, which is not only convenient for disassembly and assembly of the ball 143, but also maximizes the contact area between the groove 142 and the ball 143, making the structure of the top column 14 more stable. The lower end of the column 141 is fixedly connected to the upper end surface of the tool mounting plate 9. There are four top columns 14, two of which are located near the cutter 2 and are symmetrically distributed relative to the axis of the cutter 2, and the remaining two are located near the punch 5 and are symmetrically distributed relative to the axis of the punch 5. In this way, the top column 14 becomes a stress point and directly transmits the pressure from the lifting frame 10 to the tool mounting plate 9, which can prevent the linear guide rail 11 from being damaged by pressure; and the position of the top column 14 is set so that the tool mounting plate 9 is evenly stressed and will not bend. The setting of the rolling ball 143 allows the top column 14 to stably contact the lower end surface of the top column 14 again after it is separated from the lifting.

[0028] Since the coating 4 is ductile, during the cutting process of the cutter 2, the coating 4 may be stretched when the cutter 2 cuts downward. Figure 5 As shown, a pressing sleeve 12 is sleeved on the outer side of the cutter 2, and the inner side wall of the pressing sleeve 12 fits with the outer side wall of the cutter 2. The pressing sleeve 12 is elastically connected to the tool mounting plate 9 through a tension spring 13, so that it can be displaced in the vertical direction. Its specific structure is: mounting sleeves 122 are provided at both ends of the pressing sleeve 12, and a telescopic rod 123 is provided in the mounting sleeve 122; the lower end of the inner rod in the telescopic rod 123 is provided with a shoulder, and the lower end area of ​​the shoulder is an external thread section, and the external thread section passes through the bottom of the mounting sleeve 122 to the position where the shoulder abuts against the bottom of the mounting sleeve 122, and the nut is threadedly connected with the external thread section to achieve the installation and fixation of the inner rod. The inner rod is a solid structure, which is used to improve the strength of the telescopic rod 123. A connecting flange is provided at the upper end of the outer rod sleeved on the outside of the inner rod, and is fixedly connected to the lower end surface of the tool mounting plate 9 under the action of bolt locking. The tension spring 13 is arranged in the telescopic rod 123, the lower end of the tension spring 13 abuts against the upper end of the inner rod, and the upper end of the tension spring 13 abuts against the lower end of the tool mounting plate 9. The telescopic rod 123 automatically extends downward under the gravity of the pressing sleeve 12 and extends downward beyond the cutter 2, and the tension spring 13 is in a free state at this time. When the cutter 2 is pressed down to work, the pressing sleeve 12 first contacts the coating plate 23. When the cutter 2 continues to move downward, the tension spring 13 begins to contract and generates elastic force, so that the pressing sleeve 12 applies pressure to the coating plate 23 located outside the punching hole 3 under the action of its gravity and the elastic force of the tension spring 13. In this arrangement, when the cutter 2 cuts downward, the coating 4 around the punching hole 3 is pressed by the pressing sleeve 12, so that no stretching phenomenon occurs.

[0029] The arrangement of the telescopic rod 123 ensures that when the pressing sleeve 12 moves toward the lifting frame 10, the telescopic rod 123 is always on the lower side of the tool mounting plate 9. Compared with the traditional connection mechanism of the pressing sleeve 12 and the tension spring 13 (a connecting shaft is arranged, the lower end of which is fixedly connected to the pressing sleeve 12, and the upper end passes through the tool mounting plate 9 upward and is locked by a nut; the tension spring 13 is sleeved on the connecting shaft, the upper end of the tension spring 13 abuts against the tool mounting plate 9, and the lower end abuts against the pressing sleeve 12; when the pressing sleeve 12 descends and encounters resistance, the connecting shaft will move upward), it will not occupy the space between the tool mounting plate 9 and the lifting frame 10, which not only saves the vertical space required for the connecting shaft to pass through the tool mounting plate 9 upward, but also provides sufficient installation space for the top column 14.

[0030] When the punch 5 is punching, the end face of the coated plate 23 is compressed and plastically deformed, so that a certain curvature is generated at the upper edge of the punch hole 3 to form a curved surface. The curved surface will separate from the coating 4 and easily rust when exposed outdoors. Fig.15 As shown, the lower end of the inner hole of the pressing sleeve 12 is provided with an inner chamfer 121. The setting of the inner chamfer 121 ensures that the coating 4 within the range of the inner chamfer 121 will not be subjected to the pressure of the pressing sleeve 12. When the arc surface is formed, the coating 4 within the range of the inner chamfer 121 will be deformed accordingly and still adhere to the arc surface; and the range of the arc surface is small, and the deformation amplitude of the coating 4 is also small, and the phenomenon of breaking or detaching from the substrate 22 will not occur.

[0031] A vertically arranged support column 7 is provided at the center of the bottom plate 102, and is driven to rise and fall by a lifting cylinder 8. The specific installation structure is as follows: a vertically arranged guide cylinder 17 is provided at the center of the bottom plate 102, and a radially protruding connecting plate is provided at the lower end of the guide cylinder 17, which is fixedly connected to the bottom plate 102. A protruding positioning block 172 is also provided at the lower end of the connecting plate, which is plugged into the positioning hole on the bottom plate 102 to achieve installation and positioning. The support column 7 is plugged into the guide cylinder 17 to achieve lifting and lowering guidance.

[0032] like Fig. 9 As shown, a U-shaped slot 171 with an opening facing downward is provided at the lower portion of the guide cylinder 17. The slot 171 divides the positioning block 172 into two inferior arc-shaped parts, and the positioning hole is also matched into two arch-shaped parts, so that the part of the base plate 102 located below the slot 171 forms a continuous structure.

[0033] The lifting cylinder 8 is installed on the bottom plate 102. A convex plate is led outward from one side of the bottom plate 102, and the lifting cylinder 8 is partially arranged on the convex plate to provide sufficient installation space for the lifting cylinder 8. The lower end of the support column 7 is provided with a first guide surface 71 arranged obliquely relative to the horizontal plane; the driving end of the lifting cylinder 8 is connected to the driving block 16, and the driving block 16 is inserted into the slot 171 to achieve movement and guidance. The driving block 16 is provided with a second guide surface 161 having the same slope as the first guide surface 71; the support column 7 is provided with a portion of the first guide surface 71, and its radial projection is a right-angled trapezoid; the driving block 16 is a right-angled trapezoid; when the driving block 16 moves toward the support column 7 and the first guide surface 71 and the second guide surface 161 are connected, the support column 7 rises; when the driving block 16 moves toward the support column 7 until the first guide surface 71 and the second guide surface 161 are disengaged, the upper end surface of the driving block 16 is connected to the lower end surface of the support column 7, and at this time the upper end surface of the support column 7 is flush with the upper end surface of the support plate 15, supporting the coating plate 23.

[0034] like Figure 6 , Figure 10-12 As shown, the inner wall of the guide cylinder 17 is provided with two vertically arranged arc-shaped outer grooves 173, the lower end of the outer groove 173 passes through the lower end of the guide cylinder 17, and the upper end of the outer groove 173 is spaced from the upper end of the guide cylinder 17. The outer wall of the support column 7 is provided with a concave arc-shaped inner groove 72, which is opposite to the notch of the outer groove 173 and spliced ​​into a placement groove. The lower end of the inner groove 72 is provided with a raised support block 73, and the support block 73 is clamped in the outer groove 173 to achieve the lifting and lowering limit of the support column 7 without relative rotation. The reset spring 24 is arranged in the placement groove, and its upper end abuts against the upper end of the outer groove 173, and the lower end abuts against the support block 73. When the support column 7 rises, the reset spring 24 is compressed, and when the driving block 16 moves in the opposite direction, the support column 7 steadily descends under the combined action of its gravity and the elastic force of the reset spring 24.

[0035] The vertical arrangement of the drive block 16 and the support column 7 has the following advantages: 1. It reduces the vertical space required for the lifting cylinder 8 to drive the support column 7 to rise and fall, thereby reducing the height of the present invention and making it easier to operate; 2. When the cutter 2 cuts downward, its pressure is transmitted to the coating plate 23, the support column 7, the drive block 16 and the bottom plate 102 in sequence, which not only prevents the lifting cylinder 8 from being subjected to pressure, but also stabilizes the position of the support column 7.

[0036] The upper end surface of the guide cylinder 17 is arranged at an inclination relative to the horizontal plane; the upper end surface of the guide cylinder 17 is also hinged with a cover plate 18; the cover plate 18 is provided in two symmetrically arranged pieces to form a double-door structure. A torsion spring is provided on the hinge for hinged connection between the cover plate 18 and the guide cylinder 17, which is used to drive the cover plate 18 to close and block the hole at the upper end of the guide cylinder 17. Moreover, the cover plate 18 is a flat plate, which is parallel to or in contact with the upper end surface of the guide cylinder 17 when closed, so that the cover plate 18 is also in an inclined state. With such an arrangement, the falling cut materials will automatically fall to the outside of the guide cylinder 17 under the guidance of the cover plate 18, thereby eliminating the manual cleaning process and improving production efficiency. Figure 8 As shown, when the support column 7 rises, it will overcome the elastic force of the torsion spring and open the cover 18; Figure 7 As shown, when the support column 7 descends, the support column 7 will be hidden in the guide cylinder 17 and will not hinder the closing of the cover plate 18.

[0037] Compared with the prior art, the advantages of this embodiment are: 1. The present invention cuts off the coating 4 at the punching hole 3 before punching the hole 3 by setting a cylindrical cutter 2; thus, when the punch 5 is punching, the coating 4 is already in a cut-off state and will not break due to stress concentration during the punching process, thereby effectively solving the problem of coating 4 breaking in the traditional punching 3 process; 2. After the cutter 2 cuts off the coating 4, the punch 5 is punched again, thereby avoiding the phenomenon that the coating 4 is separated from the substrate due to rapid shrinkage during the punching process; 3. Since the cutter 2 is cutting, It will form downward pressure on the coating plate 23, so the support column 7 supports the coating plate 23 when the cutter 2 is cutting, thereby avoiding the coating plate 23 from sinking downward when cutting; 4. The cutter 2 and the punch 5 work alternately under the action of the horizontal drive assembly, avoiding the process of alternately disassembling and assembling the cutter 2 and the punch 5, making the punching 3 process more efficient and stable; 5. The aperture of the avoidance hole 151 is set to be consistent with the aperture of the punch 3, so that when the punch 5 is punching, the part around the punch 3 will not sink downward, thereby maintaining the structural stability of the coating plate 23.

[0038] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A two-stage punching device for maintaining coating continuity, used for punching holes (3) in a coated plate (23), wherein the coated plate (23) is composed of a substrate (22) and a coating (4) covering one side of the substrate (22), characterized in that: The invention comprises a bracket (1), wherein the bracket (1) is provided with: The cutter (2) is cylindrical and has a concave accommodating cavity (202) at its lower end, so that the blade (201) at the lower end of the cutter (2) forms a V-shape, and the inner side surface of the blade (201) forms an inclined surface inclined upward, which is used to cut off the coating (4) at the punching hole (3); A punch (5) for punching the coating plate (23) from which the coating (4) has been cut, so that the punch hole (3) is formed; A punching cylinder (6), used for driving the cutter (2) and the punch (5) to move upward and downward; A conversion assembly, used for driving the cutter (2) and the punch (5) to move so that they are alternately positioned opposite to the punch hole (3); A support plate (15) is arranged horizontally and is located below the cutter (2); the support plate (15) is provided with an avoidance hole (151) having the same diameter and axis as the punching hole (3); The support column (7) is located below the support plate (15) and is driven to rise and fall by a lifting cylinder (8); when the cutter (2) is working, the upper end of the support column (7) is inserted into the avoidance hole (151), and the upper end surface of the support column (7) is flush with the upper end surface of the support plate (15); when the punch (5) is working, the support column (7) is away from the coating plate (23).

2. A two-stage punching device for maintaining coating continuity according to claim 1, characterized in that: The conversion assembly comprises a horizontally arranged tool mounting plate (9), and the cutter (2) and the punch (5) are both mounted on the lower side of the tool mounting plate (9); The support (1) is provided with a lifting frame (10) which is driven to rise and fall by a stamping oil cylinder (6), and a linear guide rail (11) is installed on the lower side of the lifting frame (10); The upper end surface of the tool mounting plate (9) is fixedly connected to a sliding block in the linear guide rail (11); The tool mounting plate (9) is driven to move by a horizontal driving assembly.

3. A two-stage punching device for maintaining coating continuity according to claim 2, characterized in that: The outer side of the cutter (2) is sleeved with a pressing sleeve (12), and the inner side wall of the pressing sleeve (12) is in contact with the outer side wall of the cutter (2); The pressing sleeve (12) is elastically connected to the tool mounting plate (9) via a tension spring (13) so that it can be displaced in the vertical direction; When the cutter (2) cuts the coated plate (23), pressure is generated between the pressing sleeve (12) and the coated plate (23).

4. A two-stage punching device for maintaining coating continuity according to claim 3, characterized in that: The lower end of the inner hole of the pressing sleeve (12) is provided with an inner chamfer (121).

5. A two-stage punching device for maintaining coating continuity according to claim 3, characterized in that: The outer side wall of the pressing sleeve (12) is provided with two symmetrical, vertically arranged mounting sleeves (122) with openings facing upwards, and a telescopic rod (123) is provided inside the mounting sleeve (122); The lower end of the telescopic rod (123) is fixedly connected to the bottom of the mounting sleeve (122), and the upper end is fixedly connected to the tool mounting plate (9); The tension spring (13) is arranged in the telescopic rod (123).

6. A two-stage punching device for maintaining coating continuity according to claim 5, characterized in that: A top column (14) is provided at the upper end of the tool mounting plate (9); The lower end of the top column (14) is fixedly connected to the upper end surface of the tool mounting plate (9), and the upper end is in contact with the lower end surface of the lifting frame (10); The number of the top columns (14) is four, two of which are close to the cutter (2) and symmetrically distributed relative to the axis of the cutter (2); and the remaining two are close to the punch (5) and symmetrically distributed relative to the axis of the punch (5).

7. A two-stage punching device for maintaining coating continuity according to claim 6, characterized in that: The top column (14) comprises a column (141), and the upper end of the column (141) is provided with a hemispherical groove (142) with an opening facing vertically upwards; A rolling ball (143) with the same diameter is installed in the groove (142); The upper end of the rolling ball (143) is in contact with the lifting frame (10).

8. A two-stage punching device for maintaining coating continuity according to claim 1, characterized in that: The lower end of the support column (7) is provided with a first guide surface (71) arranged obliquely relative to a horizontal plane; The lifting cylinder (8) is arranged horizontally, and a driving end thereof is connected to a driving block (16), and the driving block (16) is provided with a second guide surface (161) having the same slope as the first guide surface (71); The support column (7) is provided with a portion of a first guide surface (71), the radial projection of which is a right-angled trapezoid; The driving block (16) is in the shape of a right-angle trapezoid; When the driving block (16) moves toward the support column (7) and the first guide surface (71) and the second guide surface (161) are connected, the support column (7) rises; When the driving block (16) moves toward the support column (7) and moves until the first guide surface (71) and the second guide surface (161) are disengaged, the upper end surface of the driving block (16) is connected to the lower end surface of the support column (7), and at this time, the upper end surface of the support column (7) is flush with the upper end surface of the support plate (15).

9. A two-stage punching device for maintaining coating continuity according to claim 8, characterized in that: A vertically arranged guide cylinder (17) is provided at the lower end of the bracket (1), and the support column (7) is inserted into the guide cylinder (17); The lower part of the guide cylinder (17) is provided with a U-shaped slot (171) with an opening facing downwards; The driving block (16) is inserted into the slot (171).

10. A two-stage punching device for maintaining coating continuity according to claim 9, characterized in that: The upper end surface of the guide cylinder (17) is arranged to be inclined relative to the horizontal plane; The upper end surface of the guide cylinder (17) is also hinged with a cover plate (18); The cover plate (18) is rotated to seal or open the upper end surface of the guide cylinder (17) by the cover plate (18); When the cover plate (18) is closed to block the upper end surface of the guide cylinder (17), the cover plate (18) is also arranged in an inclined manner.

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