Blind hole stamping die for PVC (polyvinyl chloride) switch box

Abstract

The utility model relates to the technical field of stamping equipment, in particular to a blind hole stamping die for a PVC (polyvinyl chloride) switch box, which comprises an upper die and a lower die, the upper die is arranged above the lower die, the upper die is connected with the lower die in a sliding manner through a guide post, and the blind hole stamping die is characterized in that a male die is arranged in the upper die, and a female die is arranged in the male die. The lower die comprises a lower die base, a female die and an ejection mechanism. The female die is fixed on the lower die holder, and the female die is connected with the upper die in a sliding manner through the guide column; and the ejection mechanism is arranged in the female die and is aligned with the male die in the vertical direction. After the PVC switch box is punched, punching material sheets can be quickly and flatly backfilled to the side wall of the switch box, the ejection force is balanced, and blind holes are consistent in depth.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping equipment, and more specifically, to a blind hole stamping die for a PVC switch box. Background Art

[0002] The blind holes (also known as knockout holes) of PVC switch boxes in the current industry are punched out by die or punching machine. During the punching process, the punched knockout blind holes often cannot be backfilled to the side wall of the box, resulting in uneven depth of the blind holes, the knockout hole retention force of the product cannot meet the standard, and the knockout holes are easy to fall off, resulting in the quality of the PVC switch box cannot be guaranteed. In addition, it also affects the product appearance of the PVC switch box, which is not conducive to long-term production and processing. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a PVC switch box blind hole punching equipment, in which an ejection mechanism is added to the lower die, so that after the PVC switch box is punched, the punched sheet can be quickly and evenly filled back to the side wall of the switch box, the ejection force is balanced, and the depth of the knocked-out holes is consistent.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a PVC switch box blind hole stamping mold, including an upper mold and a lower mold, the upper mold is arranged above the lower mold, and the upper mold is slidably connected to the lower mold through a guide column, and is characterized in that a punch is arranged in the upper mold, and the lower mold includes a lower mold base, a die and an ejection mechanism; the die is fixed on the lower mold base, and the die is slidably connected to the upper mold through the guide column; the ejection mechanism is arranged in the die and is aligned with the punch in the vertical direction.

[0005] In the present technical solution, the PVC switch box is placed between the upper mold and the lower mold. During stamping, the punch set in the upper mold punches the preset blind hole position of the PVC switch box. At the same time, an ejection mechanism is also provided below the preset blind hole position of the PVC switch box. During the entire stamping process, the upper and lower surfaces of the blind hole of the PVC switch box are respectively abutted against the punch and the ejection mechanism, so that the force at both ends of the blind hole is uniform during the stamping process, ensuring that the depth of the blind hole is uniform during the stamping, and having a better stamping effect. After the stamping is completed, the punching sheet of the blind hole of the PVC switch box is pushed back to its original position by the ejection mechanism, making the blind hole of the PVC switch box more beautiful.

[0006] Preferably, a mounting hole is provided on the die, the mounting hole is aligned with the position of the punch, the ejection mechanism is installed in the mounting hole, the ejection mechanism includes a ejection block, a spring and a screw plug; the screw plug is threadedly connected to the mounting hole; the spring is installed in the mounting hole and the bottom end of the spring is connected to the screw plug, the other end of the spring is connected to the ejection block, and the ejection block is located in the mounting hole.

[0007] Preferably, the die includes a die insert, a die cover plate and a die plate; the die plate is installed on the lower die base, and the die insert and the die cover plate are installed on the upper surface of the die plate; the die insert is installed on the side close to the guide column; the die cover plate is installed on the side close to the punch.

[0008] Preferably, the die cover plate and the die template are respectively provided with a first punching hole and a second punching hole; the first punching hole is connected to the second punching hole to form the mounting hole; the second punching hole is located on the die template and is a through hole; the inner surface of the second punching hole is provided with a threaded structure; the top material block and the spring are installed in the second punching hole; the screw plug is threadedly connected to the threaded structure.

[0009] Preferably, the die cover plate is detachably connected to the die plate via bolts.

[0010] Preferably, four open grooves are evenly distributed on the bottom of the male mold, and there is an arc transition near the center in the width direction of the groove.

[0011] Preferably, the upper mold includes an upper mold base and an upper mold; the upper mold base is installed above the upper mold, the male mold is installed in the upper mold, and the upper mold is slidably connected to the female mold through the guide column.

[0012] Preferably, a countersunk hole is provided in the punch; a connecting structure connected to the upper die seat is installed in the countersunk hole.

[0013] Preferably, the upper mold includes a fixed plate, a limit block, a stripping plate and a return spring; the limit block is fixed to the bottom surface of the fixed plate by bolts; the stripping plate is arranged under the fixed plate, and the guide column is fixed to the fixed plate; the stripping plate is slidably connected to the guide column; the upper end of the return spring is connected to the fixed plate, and the lower end of the return spring is connected to the stripping plate.

[0014] Preferably, the fixed plate and the unloading plate are provided with punch mounting holes for mounting the punch; the upper end of the punch is also provided with an anti-rotation plane, and the shape of the punch mounting hole on the fixed plate matches the anti-rotation plane of the punch.

[0015] Compared with the prior art, the beneficial effects of the technical solution are: an ejection mechanism is arranged in the lower die, so that the punched sheet can be quickly and smoothly filled back to the side wall of the switch box, the ejection force is balanced, and the depth of the knock-out holes is consistent; the punch is hollow, with an open groove at the bottom, and an arc transition near the center in the width direction, so that the knock-out hole connected to the side wall of the switch box is not easy to fall off; there is a countersunk hole in the punch, and the screws are locked from bottom to top, which is conducive to quick replacement; an anti-rotation plane is arranged on the top, and the punch will not deflect during the stamping process; the die insert and the die plate are detachably connected, and the blade can be quickly replaced if it is worn. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the blind hole punching die of the PVC switch box of the utility model;

[0017] Figure 2 This is an exploded view of the blind hole punching die for the PVC switch box of the utility model;

[0018] Figure 3 It is a stereoscopic diagram of the convex die of the blind hole punching die of the PVC switch box of the utility model;

[0019] In the accompanying drawings: 1. upper mold; 2. lower mold; 3. guide column; 4. punch; 11. upper mold base; 12. upper mold; 121. fixed plate; 122. limit plate; 123. unloading plate; 124. reset hole; 21. lower mold base; 22. die; 23. ejector mechanism; 221. die insert; 222. die cover plate; 223. die plate; 231. ejector block; 232. spring; 233. screw plug. DETAILED DESCRIPTION

[0020] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0021] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0022] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0023] Example 1

[0024] like Figure 2 As shown, a PVC switch box blind hole stamping die comprises an upper die 1 and a lower die 2, wherein the upper die 1 is arranged above the lower die 2, and the upper die 1 is slidably connected to the lower die through a guide column 3, and is characterized in that a punch 4 is arranged in the upper die 1, and the lower die 2 comprises a lower die seat 21, a die 22 and an ejection mechanism 23; the die 22 is fixed on the lower die seat 21, and the die 22 is slidably connected to the upper die through a guide column 3; the ejection mechanism 23 is arranged in the die 22 and is aligned with the punch 4 in the vertical direction. The PVC switch box is placed between the upper die 1 and the lower die 2, and during stamping, the punch 4 arranged in the upper die 1 stamps the preset blind hole position of the PVC switch box. At the same time, an ejection mechanism 23 is also arranged below the preset blind hole position of the PVC switch box, and the upper and lower surfaces of the blind hole of the PVC switch box are respectively in contact with the punch 4 and the ejection mechanism 23 during the entire stamping process, so that the two ends of the blind hole are subjected to uniform force during the stamping process, ensuring that the depth of the blind hole is uniform during stamping, and having a better stamping effect. After the punching is completed, the punching sheet of the blind hole of the PVC switch box is pushed back to the original position by the ejection mechanism 23, making the blind hole of the PVC switch box more beautiful. The upper mold 1 and the lower mold 2 are slidably connected by the guide column 3. Due to the limitation of the guide column 3, the upper mold 1 and the lower mold 2 can only make relative linear motion in the vertical direction, ensuring that the punch 4 will not be offset during the punching, resulting in deviation of the blind hole punching position.

[0025] The die 22 is provided with a mounting hole, which is aligned with the position of the punch 4. The ejection mechanism 23 is installed in the mounting hole. The ejection mechanism 23 includes a ejection block 231, a spring 232 and a screw plug 233; the screw plug 233 is threadedly connected to the mounting hole; the spring 232 is installed in the mounting hole and the bottom end of the spring 232 is connected to the screw plug 233, and the other end of the spring 232 is connected to the ejection block 231, and the ejection block 231 is located in the mounting hole. During the stamping operation, the punch 4 abuts against the ejection block 231 and the upper and lower surfaces of the blind hole of the PVC switch box, so that the punching sheet of the blind hole of the PVC switch box is confined in the space between the punch 4 and the ejection block 231, ensuring that the blind hole of the PVC switch box will not be offset during the stamping process, resulting in uneven depth. The spring 232 provides support for the ejection block 231. Since the spring 232 is elastic, it can adapt to the linear motion of the ejector block 231 in the vertical direction during the stamping process, and continuously provide support for it. The bottom surface of the spring 232 abuts against the screw plug 233, and the screw plug 233 is threadedly connected to the die 22, which is easy to disassemble and convenient for replacing the ejector mechanism 23.

[0026] The die 22 includes a die insert 221, a die cover plate 222 and a die plate 223; the die plate 223 is installed on the lower die base 21, and the die insert 221 and the die cover plate 222 are installed on the upper surface of the die plate 223; the die insert 221 is installed on the side close to the guide column 3; the die cover plate 222 is installed on the side close to the punch 4. During stamping, the upper surface of the die 22 directly bears the load during stamping, especially the cutting edge position of the punching hole. After long-term work, the punching hole position of the die 22 is very easy to wear, resulting in the change of the shape of the blind hole of the PVC switch box after punching, which affects the quality of the PVC switch box. At the same time, if the die 22 is replaced as a whole after the cutting edge is worn, it will result in too high a cost. Therefore, the upper surface of the die 22 is divided into a die insert 22 and a die cover plate 23. The die cover plate 23 is located at the punching hole position on the upper surface of the die and is most severely worn, so it is detachably connected to the die plate 223. The die insert 222 is the part of the upper surface of the die 22 that is not directly subjected to punching and is less worn and does not need to be replaced frequently. Therefore, when the die edge is worn, only the die insert 223 needs to be replaced, which ensures the punching quality and greatly saves the replacement cost.

[0027] The die cover plate 222 and the die plate 223 are respectively provided with a first punching hole and a second punching hole; the first punching hole is connected to the second punching hole and forms a mounting hole; the second punching hole is located on the die plate 223 and is a through hole; a threaded structure is provided on the inner surface of the second punching hole; the ejector block 231 and the spring 232 are installed in the second punching hole; the screw plug 233 is threadedly connected with the threaded structure. During stamping, the punching sheet of the blind hole of the PVC switch box is punched into the first punching hole and the second punching hole by the punch 4, providing space for the punching of the punch 4. At the same time, the ejector mechanism 23 is installed in the second punching hole to cooperate with the punch 4 to perform the stamping operation. The inner surface of the second punching hole is a threaded hole, and the screw plug 233 is screwed in from the lower end of the second punching hole and is threadedly connected with the second punching hole. On the one hand, the screw plug 233 can adjust the height of the ejector plate 221 according to the depth of screwing into the second punching hole, thereby adjusting the position of the punching sheet of the blind hole of the PVC switch box ejected by the ejection mechanism 23. After multiple punchings, the spring in the ejection mechanism 23 is prone to failure. At this time, it is only necessary to unscrew the screw plug 233 from the bottom of the second punching hole, and the spring 232 and the ejector block 231 can fall out of the second punching hole under their own gravity, so that the spring 232 and the ejector block 231 can be quickly replaced.

[0028] The die cover plate 222 is detachably connected to the die plate 223 by pins. The pin connection fixing method is simple, and the fixing operation can be completed quickly, ensuring that the relative position of the die cover plate 222 and the die plate 223 does not change, and is easy to disassemble, facilitating the rapid replacement of the die cover plate 222.

[0029] Example 2

[0030] This embodiment is similar to the above-mentioned embodiment 1, except that: Figure 3 As shown, the bottom of the punch 4 is evenly distributed with four open grooves 41, and there is an arc transition near the center in the width direction of the groove 41. The bottom of the punch 4 is in direct contact with the blind hole of the PVC switch box during punching, and the shape of the blind hole of the PVC switch box is determined by the shape of the bottom of the punch 4. The four open grooves 41 evenly distributed at the bottom of the punch 4 reserve a connection between the punching sheet of the blind hole of the PVC switch box and other parts of the PVC switch box, and there is an arc transition near the center in the width direction, so that the knock-out hole connected to the side wall of the switch box is not easy to fall off.

[0031] Example 3

[0032] This embodiment is similar to the above-mentioned embodiment 1, except that: Figure 1 As shown, the upper mold 1 includes an upper mold base 11 and an upper mold 12; the upper mold base 11 is installed above the upper mold 12, the punch 4 is installed in the upper mold 12, and the upper mold 12 is slidably connected to the die 22 through the guide column 3. During stamping, the upper mold 1 is pressed and moves downward as a whole, and the punch 4 installed in the upper mold 1 also moves downward with the upper mold 1 to stamp the blind hole of the PVC switch box. During the entire stamping process, the movement trajectory of the upper mold 1 is limited by the guide column 3, so that its function and the die 22 make relative linear motion, ensuring the stability of the PVC switch box blind hole stamping mold during operation.

[0033] like Figure 3 As shown, a countersunk hole 42 is provided in the punch 4; a connection structure connected to the upper die seat 11 is installed in the countersunk hole 42. The connection structure is a screw provided in the countersunk hole 42, and the punch 4 is screwed to the upper die seat 11. Since the punch 4 is in direct contact with the blind hole of the PVC switch box during the stamping process, the punch 4 is also prone to edge wear. Therefore, a countersunk hole is provided in the punch 4 to be screwed to the upper die seat 11, and when replacing the punch 4, it is only necessary to unscrew the screw to realize the disassembly of the punch 4.

[0034] like Figure 2As shown, the upper die 12 includes a fixed plate 121, a stopper 122, a stripper plate 123 and a return spring 124; the stopper 122 is fixed to the bottom surface of the fixed plate 121 by bolts; the stripper plate 123 is arranged below the fixed plate 121, and the guide column 3 is fixed on the fixed plate 121; the stripper plate 123 and the guide column 3 are slidably connected; the upper end of the return spring 124 is connected to the fixed plate 121, and the lower end of the return spring 124 is connected to the stripper plate 123. During stamping, the upper die 1 is pressed to move downward, and since the punch 4 is fixed on the upper die seat 11 and the fixed plate 121 is fixed on the upper die seat 11, the punch 4 moves integrally with the fixed plate 121. During stamping, the upper die seat 11, the fixed plate 121, the stopper 122 and the punch 4 move downward until the stopper 122 abuts against the stripper plate 123. The limit block 122 is replaceable, and a suitable limit block 122 can be replaced according to the blind holes of the PVC switch box of different depths as required. A through reset hole is provided on the fixed plate 121, and a reset spring 124 is provided in the reset hole, and the upper and lower ends are respectively connected to the upper die seat 11 and the unloading plate 123. After the stamping is completed, the reset spring 124 lifts the upper die seat 11, the fixed plate 121, the limit plate 122 and the punch 4 through its own elastic force, and restores them to the initial position. The unloading plate 123 presses the PVC switch box so that the PVC switch box will not rise with the punch 4, ensuring that the PVC switch box is separated from the punch 4.

[0035] The fixed plate 121 and the unloading plate 123 are provided with a punch mounting hole for mounting the punch 4; the upper end of the punch 4 is also provided with an anti-rotation plane 43, and the shape of the punch mounting hole on the fixed plate 121 matches the anti-rotation plane 43 of the punch 4. During the stamping process, the uneven acceptance of the bottom surface of the punch 4 may cause the punch 4 to deflect, affecting the stamping effect. After the anti-rotation plane 43 is provided, when the punch 4 deflects, the anti-rotation plane of the punch 4 will conflict with the punch mounting hole on the fixed plate 121, thereby limiting the deflection of the punch 4 and ensuring the quality of the stamping operation.

[0036] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A PVC switch box blind hole stamping die, comprising an upper die (1) and a lower die (2), wherein the upper die (1) is arranged above the lower die (2), and the upper die (1) is slidably connected to the lower die (2) via a guide column (3), characterized in that: The upper mold (1) is provided with a punch (4), and the lower mold (2) comprises a lower mold base (21), a die (22) and an ejection mechanism (23); the die (22) is fixed on the lower mold base (21), and the die (22) is slidably connected to the upper mold (1) via the guide column (3); the ejection mechanism (23) is arranged in the die (22) and is aligned with the punch (4) in the vertical direction, and a mounting hole is provided on the die (22), and the mounting hole is aligned with the position of the punch (4), and the ejection mechanism (23) is installed in the mounting hole, and the ejection mechanism (23) comprises an ejection block (231), a spring (232) and a screw plug (233); the screw The plug (233) is threadedly connected to the mounting hole; the spring (232) is installed in the mounting hole and the bottom end of the spring (232) is connected to the screw plug (233), the other end of the spring (232) is connected to the ejector block (231), and the ejector block (231) is located in the mounting hole. The die (22) comprises a die insert (221), a die cover plate (222) and a die template (223); the die template (223) is installed on the lower die base (21), the die insert (221) and the die cover plate (222) are installed on the upper surface of the die template (223); the die insert (221) is installed on a side close to the guide column (3); the die cover plate The plate (222) is installed on a side close to the punch (4); the die cover plate (222) and the die template (223) are respectively provided with a first punching hole and a second punching hole; the first punching hole is connected to the second punching hole and forms the installation hole; the second punching hole is located on the die template (223) and is a through hole; the inner surface of the second punching hole is provided with a threaded structure; the ejecting block (231) and the spring (232) are installed in the second punching hole; the screw plug (233) is threadedly connected to the threaded structure; the die cover plate (222) and the die template (223) are detachably connected by bolts; the bottom of the punch (4) is evenly distributed with 4 open grooves (41), and the grooves ( 41) There is an arc transition near the center in the width direction, the upper mold (1) includes an upper mold base (11) and an upper mold (12); the upper mold base (11) is installed above the upper mold (12), the punch (4) is installed in the upper mold (12), the upper mold (12) is slidably connected with the die (22) through the guide column (3), and a countersunk hole (42) is provided in the punch (4); a connecting structure connected to the upper mold base (11) is installed in the countersunk hole (42), and the upper mold (12) includes a fixed plate (121), a limit block (122), a discharge plate (123) and a reset spring (124); the limit block (122) is fixed to the bottom surface of the fixed plate (121) by bolts;The stripping plate (123) is arranged below the fixed plate (121), and the guide column (3) is fixed on the fixed plate (121); the stripping plate (123) and the guide column (3) are slidably connected; the upper end of the return spring (124) is connected to the fixed plate (121), and the lower end of the return spring (124) is connected to the stripping plate (123); the fixed plate (121) and the stripping plate (123) are provided with a punch mounting hole for mounting a punch (4); the upper end of the punch (4) is also provided with an anti-rotation plane (43), and the shape of the punch mounting hole on the fixed plate (121) matches the anti-rotation plane (43) of the punch (4). ;

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