Film blanking device

Abstract

The utility model belongs to the technical field of film blanking devices, and particularly provides a film blanking device. The film blanking device comprises a blanking head and a workbench, the workbench is provided with a flat supporting face used for supporting a film to be blanked, the blanking head comprises a cylinder, one end of the cylinder is a cutting edge end, the end, away from the cutting edge end, of the cylinder is a stress end, and the stress end is used for bearing impact force of an external impact device. The cutting edge end is provided with an annular cutting edge matched with a needed film in size and a containing hole used for containing the cut film, the hardness of the cutting edge is larger than that of the supporting face, and the hardness of the supporting face is Shore hardness 55-65. The thin film blanking head can achieve blanking of a thin film, the supporting face is within the hardness range, the phenomenon that the cutting edge of the blanking head is broken can be avoided, a good supporting effect can be achieved, the thin film is prevented from being stretched and deformed to generate trimming burrs after being stressed, and the flatness of the thin film can be guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of film punching devices, in particular to a film punching device. Background Art

[0002] High-voltage switches are critical electrical equipment in power systems. During switch operation, especially when disconnecting a circuit, transient overvoltages can occur, potentially damaging the power system. To monitor these transient overvoltages, sensors are typically installed on high-voltage switches to analyze and detect steep overvoltages caused by rapid voltage drops during operation and disruptive discharges.

[0003] The sensor is based on the principle of a capacitive voltage divider, such as Figure 1 As shown, a monitoring window can be opened on the housing 100 of the high-voltage switch, and a cover plate 300, a disk electrode 200, and a resistor 400 led from the disk electrode 200 are installed at the window position. The resistor 400 can be connected to an external circuit to connect to the display module. A film 3 with a high voltage resistance grade, such as a PET polyamide film, is provided between the cover plate 300 and the disk electrode 200. Its function is to prevent charge leakage and short circuit of the high-voltage electrode of the capacitor. Therefore, the film needs to have a highly uniform structure and high-strength insulation performance.

[0004] Pressure-resistant film available on the market typically comes in rolls or larger sheets. Production requires cutting the film to the appropriate shape and size based on actual needs. Existing methods typically involve workers using handheld scissors to cut the film, but this method struggles to ensure film flatness and can easily leave burrs and flash on the cut edges, compromising the film's insulation performance. Utility Model Content

[0005] The purpose of the utility model is to provide a film punching device to solve the technical problem in the prior art that manual cutting of pressure-resistant films easily causes insufficient film flatness and edge burrs, thereby affecting insulation performance.

[0006] To achieve the above-mentioned purpose, the technical solution of the film punching device provided by the present invention is:

[0007] A film punching device includes a punching head and a workbench. The workbench has a flat supporting surface for supporting the film to be punched. The punching head includes a column, one end of the column is a cutting edge end, and the end away from the cutting edge end is a force-bearing end. The force-bearing end is used to withstand the impact force of an external impact device. The cutting edge end is provided with an annular cutting edge whose size is adapted to the required film and a receiving hole for accommodating the cut film. The hardness of the cutting edge is greater than the hardness of the supporting surface. The hardness of the supporting surface is 55-65 Shore hardness.

[0008] As a further improvement, the workbench is an integral plate-shaped or block-shaped structure, and the upper surface of the workbench constitutes the supporting surface.

[0009] As a further improvement, the workbench is a polytetrafluoroethylene plate or a polytetrafluoroethylene block.

[0010] As a further improvement, the force-bearing end is connected to a force-bearing plate, and the outer circumference of the force-bearing plate is larger than the outer circumference of the column.

[0011] As a further improvement, the force-bearing plate and the force-bearing end are connected and matched via a detachable interlocking structure.

[0012] As a further improvement, the interlocking structure includes an annular slot provided on one of the force-bearing end and the force-bearing plate and an annular boss provided on the other, and the boss and the slot are plugged into and fitted with each other.

[0013] As a further improvement, the groove wall of the slot and the outer convex surface of the boss are both arc-shaped surfaces.

[0014] As a further improvement, the outer periphery of the column is further provided with a supporting structure for workers to hold by hand or clamp with hand tools to support the column.

[0015] As a further improvement, the supporting structure is formed by an inwardly concave annular groove on the outer periphery of the column.

[0016] As a further improvement, the groove wall of the concave annular groove is an arc-shaped surface.

[0017] The beneficial effect is that the utility model is a pioneering invention. Specifically, when in use, a punching head with a suitable cutting edge is selected, and the film to be punched is placed on the support surface of the workbench. The external impact device impacts the force-bearing end, and the impact force can be transmitted to the cutting edge through the punching head. The cutting edge can cut the film and cut out the film of the required shape and size. The cut film can enter the receiving hole. The hardness of the supporting surface is in the range of 55-65 Shore hardness. Within this hardness range, on the one hand, it is not easy to cause the cutting edge to break, and at the same time, it has a strong performance of supporting the film. The film is not easily stretched and deformed after being subjected to force, and thus a film with good flatness and less flash and burrs can be cut out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the connection and installation relationship between the sensor and the high-voltage switch;

[0019] Figure 2 This is a schematic structural diagram of a punching head in an embodiment of a film punching device of the present invention (the slot is not shown);

[0020] Figure 3 This is a structural schematic diagram of the punching head of the film punching device embodiment of the present invention from another perspective;

[0021] Figure 4 A cross-sectional view of a punching head of an embodiment of a film punching device according to the present invention (the slot is not shown);

[0022] Figure 5 This is a schematic diagram of the state of the film punching device embodiment of the present invention when in use;

[0023] Figure 6 This is a cross-sectional view of an embodiment of the film punching device of the present invention when in use;

[0024] Figure 7 for Figure 4 Cross-sectional view of the punch head.

[0025] Description of reference numerals:

[0026] 1. Punching head; 2. Workbench; 3. Film; 101. Force-bearing end; 102. Cutting edge; 103. Slot; 104. Inwardly concave annular groove; 105. Force-bearing plate; 106. Boss; 107. Accommodating hole; 100. Housing; 200. Disc electrode; 300. Cover plate; 400. Resistor. DETAILED DESCRIPTION

[0027] In the prior art, it is difficult to cut a smooth film with few burrs by using handheld scissors to cut the film. In order to solve this problem, the basic technical concept of the present invention is to provide a film cutting device based on a punching process. Specifically, the punching device includes a punching head and a workbench. When in use, the film to be cut can be placed on the workbench. One end of the punching head has an annular cutting edge and a receiving hole, which can be defined as a cutting edge end, wherein the size of the cutting edge is adapted to the size of the film to be punched, and the other end can be used as a force-bearing end. The external impact device can impact or hit the force-bearing end. After the punching head is subjected to force, it can punch the film downward, and the cut film can enter the receiving hole at the cutting edge end. At the same time, the support surface in the workbench for supporting the film also has a suitable hardness. Specifically, the hardness of the cutting edge is greater than the hardness of the supporting surface, and the hardness of the supporting surface is 55-65 Shore hardness. Within this hardness range, it can not only avoid the chipping of the cutting edge of the punching head, but also play a good supporting role, preventing the film from being stretched and deformed after being subjected to force to produce cutting edge burrs, and can also ensure the flatness of the film.

[0028] The present invention is described in further detail below in conjunction with the embodiments and drawings.

[0029] Specific embodiments of the film punching device provided by the utility model:

[0030] The film punching device provided in this embodiment is as follows Figure 2-Figure 7 As shown, the whole comprises a punching head 1 and a workbench 2. The structure of the workbench 2 is as follows Figure 5and Figure 6 As shown, it has a support surface for supporting the film 3 to be punched, that is, the upper surface shown in the figure. The support surface is a flat surface. As an embodiment of the punching head 1, as shown Figure 2-Figure 4 As shown, the punching head 1 is a columnar structure as a whole, which includes a column, one end of which is provided with an annular cutting edge and a receiving hole 107, which can be defined as the cutting edge end 102, and the other end opposite to the cutting edge end 102 is used to withstand the impact force from the impact tool, which can be defined as the force-bearing end 101. When in use, the staff can use or operate the impact device. For example, the impact device can be a hand hammer. The staff can hold the hand hammer and hit the force-bearing end 101. After the punching head 1 is subjected to force, it can produce a downward impact action. Of course, the impact device can also be a small press. The cutting edge in the cutting edge end 102 can punch out the film 3 on the workbench 2 and punch out a film 3 of a suitable size. The film 3 can enter the receiving hole 107. The size of the cutting edge should be consistent with the required size of the film 3. The specific shape can be circular, square, polygonal, etc. according to actual needs.

[0031] Analyzing the microscopic deformation process when punching the film 3, in order to avoid the edge of the cutting edge from chipping due to impact and the deformation of the workbench 2 due to impact, which causes the film 3 to be tensilely deformed and produce burrs, the support surface of the workbench 2 should have a suitable hardness. Specifically, the hardness range of the support surface should be between 55 and 65 Shore hardness, for example, the hardness range can be 55, 56, 58, 60, 65 Shore hardness, etc. This range is lower than that of the punching head 1 made of general metal materials, so chipping generally does not occur. At the same time, it can also provide sufficient support, and the film 3 will not sink into the workbench 2 after being impacted, thereby improving the flash and burr phenomena, and also ensuring the flatness of the film 3, making it suitable for use as an insulating medium for high-voltage switches. In addition, within this hardness range, the depth of the cutting edge into the workbench 2 will not be too deep. After the punching is completed, the punching head 1 is removed, and the film 3 can automatically fall off from the receiving hole 107.

[0032] As a specific embodiment of the workbench 2, Figure 5 and Figure 6 As shown, the workbench 2 is a monolithic workbench 2, which can be a plate-like or block-like structure, the upper surface of which constitutes the support surface for the supporting film 3. Preferably, the workbench 2 can be made of a polytetrafluoroethylene plate or a polytetrafluoroethylene block. The plate or block supported by polytetrafluoroethylene has a suitable hardness range. Polytetrafluoroethylene is also commonly used as insulating plates or blocks, which can be directly obtained from the warehouse, which is convenient and fast. Of course, in other embodiments, the workbench 2 can also be made of nylon with a Shore hardness range of 55-65.

[0033] As another specific embodiment of the workbench 2, the workbench 2 may also be a modular structure. For example, the workbench 2 may include a base on which a support plate with a suitable hardness range is mounted, such as a polytetrafluoroethylene plate.

[0034] For the convenience of staff, such as Figure 5 and Figure 6 As shown, the force-bearing end 101 of the punching head 1 is also connected to a force-bearing plate 105. The outer circumference of the force-bearing plate 105 is larger than the outer circumference of the column. Figure 2-Figure 4 Compared with the punching head shown in , this can increase the force-bearing area of the force-bearing end 101, making it easier for the staff to knock. It can be understood that in other embodiments, without setting the force-bearing plate 105, the force-bearing end 101 of the column can also be directly impacted.

[0035] Specifically, if Figure 6 As shown, the force-bearing plate 105 and the force-bearing end 101 are connected and matched by a chimeric structure, and the chimeric structure is a detachable chimeric structure. The use of a detachable chimeric structure can ensure the stability of the connection between the force-bearing plate 105 and the force-bearing end 101. In addition, after use, the force-bearing plate 105 can also be removed and stored separately for easy storage. At the same time, when punching films 3 of different sizes or shapes, the shape of the punching head 1 is different, but the force-bearing end 101 of the punching head 1 can be connected to the same force-bearing plate 105, making the force-bearing plate 105 universal.

[0036] More specifically, as an embodiment of the mosaic structure, Figure 6 and Figure 7 As shown, the force-bearing end 101 is provided with a slot 103, and the force-bearing plate 105 is provided with a boss 106 that can be interlocked with the slot 103. The slot 103 is an annular structure, and the boss 106 is also an annular structure. This ensures that the boss 106 and the slot 103 have a large contact area, ensures the reliability of the connection, and at the same time, facilitates the centering connection. Of course, in other embodiments, the positions of the slot 103 and the boss 106 can also be interchanged, that is, the boss 106 is provided at the force-bearing end 101, and the slot 103 is provided on the force-bearing plate 105. Preferably, the groove wall of the slot 103 and the convex surface of the boss 106 are both arc-shaped surfaces. Compared with the slot 103 in other embodiments having mutually perpendicular groove side walls and groove bottom walls, this ensures that there is a large contact area while avoiding the formation of force-bearing sharp corners, and avoids stress concentration when the force-bearing plate 105 is struck.

[0037] It is not difficult to understand that the above provides an embodiment of a chimeric structure that is easy to use and has better force bearing capacity. In other embodiments, the chimeric structure may include a plurality of point-distributed slots 103 arranged on the force-bearing end 101 and a plurality of point-distributed bosses 106 arranged on the force-bearing plate 105, and the bosses 106 and the slots 103 correspond to each other one by one.

[0038] Of course, in other embodiments, the connection between the force-bearing plate 105 and the force-bearing end 101 may be other ways, such as welding or connection using fasteners (such as screws).

[0039] like Figure 2-Figure 7 As shown, a support structure is also provided on the periphery of the column. During use, the operator can hold the support structure by hand or with a handheld tool to support the column, thereby ensuring the stability of the punching head 1 and preventing it from being knocked off course or crooked. When equipped with a force plate 105, the force plate 105 can also serve as a protective function to prevent hands from being knocked off course.

[0040] Specifically, the support structure is formed by a concave annular groove 104 on the outer periphery of the column. When held directly by a worker, the concave portion can precisely accommodate the worker's fingers, making it easier to use. More specifically, the groove walls of the concave annular groove 104 are curved. Compared to the slots 103 in other embodiments with perpendicular sidewalls and bottom walls, this can better fit the shape of the fingers, improving the user experience.

[0041] Of course, in other embodiments, the supporting structure may also be other structures, for example, instead of providing the inner concave annular groove 104 on the outer periphery of the column, a knurling structure may be directly provided.

[0042] Furthermore, in other embodiments, if the film 3 being punched is relatively large, meaning the cutting edge is also relatively large, in practice, simply placing the cutting edge 102 directly on the film 3 can maintain stability, eliminating the need for support during the entire punching process. This is especially true when used with a small press, as the force exerted on the punching head by the small press is vertical, and generally, there will be no problems with deflection or warping. In other words, in this case, no support structure is required on the column.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments without inventive effort, or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A film punching device, characterized in that: It includes a punching head and a workbench. The workbench has a flat supporting surface for supporting the film to be punched. The punching head includes a column. One end of the column is a cutting edge end, and the end away from the cutting edge end is a force-bearing end. The force-bearing end is used to withstand the impact force of an external impact device. The cutting edge end is provided with an annular cutting edge whose size is adapted to the required film and a receiving hole for accommodating the cut film. The hardness of the cutting edge is greater than the hardness of the supporting surface. The hardness of the supporting surface is 55-65 Shore hardness.

2. The film punching device according to claim 1, wherein: The workbench is an integral plate-shaped or block-shaped structure, and the upper surface of the workbench constitutes the supporting surface.

3. The film punching device according to claim 2, wherein: The workbench is a polytetrafluoroethylene plate or a polytetrafluoroethylene block.

4. The film punching device according to claim 1, wherein: The force-bearing end is connected with a force-bearing plate, and the outer circumference size of the force-bearing plate is larger than the outer circumference size of the column.

5. The film punching device according to claim 4, wherein: The force-bearing plate and the force-bearing end are connected and matched through a detachable interlocking structure.

6. The film punching device according to claim 5, wherein: The interlocking structure comprises an annular slot provided on one of the force-bearing end and the force-bearing plate and an annular boss provided on the other, and the boss and the slot are plugged and matched with each other.

7. The film punching device according to claim 6, wherein: The groove wall of the slot and the outer convex surface of the boss are both arc-shaped surfaces.

8. The film punching device according to any one of claims 1 to 7, characterized in that: The outer periphery of the column is also provided with a supporting structure for workers to hold by hand or clamp with hand tools to support the column.

9. The film punching device according to claim 8, wherein: The supporting structure is formed by an inwardly concave annular groove on the outer periphery of the column.

10. The film punching device according to claim 9, wherein: The groove wall of the concave annular groove is an arc-shaped surface.

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