An L-shaped fuse shaping and pressing die

Abstract

The invention relates to an L-shaped fuse shaping and pressing die, comprising an upper fixing bolt, an upper die fixing plate, an upper die, a spring, a guide column, a lower die, a lower die fixing plate, a fixing screw, a base, a locking bolt, a guide block, an L-shaped fuse, a stop block, a fine-tuning wedge block, and a lower fixing bolt. When manufacturing and installing the L-shaped fuse, the guide block in the design scheme limits the deflection freedom of the contacts on both sides of the fuse tube when they are pressed down, thereby ensuring that the L-shaped contacts on both sides of the fuse tube are straight and on the same plane. This not only avoids the scrapping of some products due to shaping after they are made into finished products, resulting in an increase in manufacturing costs, but also fully ensures that all L-shaped fuses delivered for installation and use will not have invisible cracks, thereby improving the safety and protection capability of the fuse during use and also helping to extend the service life of the fuse.

Description

Technical field:

[0001] The present invention relates to a safety protection device for electric circuits and electric equipment, and in particular to an auxiliary tool used in the production process of fuses. Background technology:

[0002] A fuse is an electrical device that generates heat to melt the fuse element and disconnect the circuit when the current exceeds the specified value. When in use, the fuse is connected in series with the protected circuit. When an overload or short-circuit current passes through the fuse element, the fuse element will heat up and melt, thereby protecting the power system, various electrical equipment and household appliances. For L-shaped fuses that are directly connected to the protected circuit or equipment with bolts (such as the attached Figure 1 The most basic requirement during the manufacturing and assembly process is that the L-shaped contacts on both sides of the fuse tube must be straight and on a straight line. This way, when connecting and installing, the L-shaped contacts can fully contact the terminal block on the protected circuit or equipment, minimizing the contact resistance and the corresponding temperature rise and power loss.

[0003] However, during the manufacturing and installation of this L-shaped fuse, because the contacts are pressed onto the fuse tube in an interference fit manner, there is a certain tolerance between the inner diameter of the contacts and the outer diameter of the fuse tube, and the fuse tube itself is made of ceramic and will also deform to a certain extent during the firing process. Therefore, during the pressing process, there is no limit setting on the sides of the contacts and the fuse tube, and the pressing process has a certain degree of freedom. However, due to tolerance reasons, it cannot be guaranteed that the contact and the fuse tube sleeve part are 100% completely perpendicular. In most cases, there will be a certain deviation between the radial direction of the contacts and the radial direction of the fuse tube. Therefore, the finished product cannot 100% guarantee that the L-shaped contacts extending from both sides of the fuse tube are on the same plane. There is generally a certain deviation, and there is a certain amount of warping inward or outward.

[0004] If the L-shaped contacts on both sides of the fuse tube are not straight and are not in a straight line, problems will arise during installation and use: if the bolts connecting the terminal block are not tightened, the contact surface between the terminal block and the contacts will be reduced and cannot be fully contacted, which will cause high contact resistance during use. In severe cases, the fuse will not be able to perform its due protection function; and if external force is used to tighten the bolts thoroughly, forcing the L-shaped contacts on both sides of the fuse tube to be in a straight line instead of being in a straight line, if the terminal blocks are fully in contact, then in the process of tightening the bolts, the external force will be transmitted to the fuse tube, which may cause the ceramic fuse to crack or break directly under the pressure of the lateral force, rendering the fuse scrapped.

[0005] In order to ensure that the contacts on both sides of the fuse tube of all delivered L-shaped fuses are straight and in a straight line, the industry currently generally adopts a method similar to "post-mortem examination". That is, after the fuse is manufactured, a shaping and pressing process is added. That is, the fuse is placed flat on the stamping machine and stamped again. The stamping eliminates the warping of the contacts on both sides of the fuse tube, making the contacts straight and in a straight line after pressing. After the pressing is completed, they are inspected and sorted one by one. Those with cracks or cracks are picked out and scrapped, and the remaining intact ones are delivered for use. This kind of unavoidable operation and processing method not only increases the efficiency of the process, but also causes a certain number of finished products to be scrapped, increasing the production cost. Or there are missed cracks (such as invisible cracks) that flow into the installation and use link. Because the fuse tube has cracks and its strength is reduced, if it is not discovered during the installation process, it may rupture due to heat or other external forces (such as bumps, vibrations, etc.) after power is turned on and used, which is likely to cause an accident. Summary of the invention:

[0006] In order to address the above shortcomings, the present invention provides an L-shaped fuse shaping and pressing mold. When manufacturing and installing the L-shaped fuse, the guide block in the design scheme limits the deflection freedom of the contacts on both sides of the fuse tube when they are pressed down, thereby ensuring that the L-shaped contacts on both sides of the fuse tube are straight and on the same plane. This not only avoids the scrapping of some products due to pressing and shaping after they are made into finished products, resulting in increased manufacturing costs, but also fully ensures that all L-shaped fuses delivered for installation and use will not have invisible cracks, thereby improving the safety and protection capabilities of the fuse during use, and also helping to extend the service life of the fuse.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] 1. An L-shaped fuse shaping pressing die, comprising an upper fixing bolt, an upper die fixing plate, an upper die, a spring, a guide post, a lower die, a lower die fixing plate, a fixing screw, a base, a locking bolt, a guide block, an L-shaped fuse, a stopper, a fine-tuning wedge, and a lower fixing bolt; characterized in that: the upper die is connected and fixed to the upper die fixing plate by an upper fixing bolt, and the lower die is connected and fixed to the lower die fixing plate by a lower die fixing screw; a spring is installed between the upper die and the lower die so that there is a certain distance between the two, and a guide post is passed through the inner ring of the spring, which plays the role of connecting the upper and lower dies to fix and limit the position of the spring; the guide block is installed between the upper die and the lower die in a side-standing manner, the stopper plays the role of limiting the position of the guide block and preventing demoulding, the fine-tuning wedge is located at the bottom of the guide block, plays the role of adjusting the height of the guide block, and the lower die is connected and installed on the base by fixing bolts and locked by locking bolts.

[0009] 2. The upper die is provided with a guide groove for inserting the guide block and a spare screw hole to position and limit the guide block when necessary to prevent displacement or loosening.

[0010] 3. The upper die fixing plate is provided with guide holes and spare screw holes; the guide holes are used to insert the guide pins, and the spare screw holes are used to strengthen the connection and installation reliability between the upper die and the upper die fixing plate.

[0011] 4. A fuse contact slot is provided on the lower die.

[0012] 5. The guide block is provided with a groove for guiding and positioning the fuse.

[0013] 6. A guide block insertion slot and a garbage slot hole are provided on the base. The guide block insertion slot is used to install the guide block. The garbage slot hole is connected to the guide block insertion slot to clean the quartz sand arc extinguishing filler that falls from the melting tube into the guide block insertion slot during the installation of the fuse.

[0014] The L-shaped fuse shaping pressing die provided by the present invention, when manufacturing and installing the L-shaped fuse, first performs the first stamping to pre-assemble the L-shaped contacts on both ends of the fuse tube (that is, lightly presses on the fuse tube, and the pressing depth does not exceed 1 / 5 to 1 / 4 of the required pressing depth), then places the lower L-shaped contact part into the fuse contact slot in the lower die, and then uses the guide groove provided on the guide block of the present design to guide and position the fuse, and inserts the upper fuse together with the L-shaped part of the contact on the upper part of the fuse tube into the guide groove of the guide block of the upper die, starts the stamping machine, and performs the second downward pressure to press the contact sleeves at both ends of the fuse tube into place. When pressing down, the L-shaped part of the contact at the lower end of the fuse tube is pre-engaged in the fuse slot in the lower mold, and the L-shaped part of the contact at the other end is engaged in the positioning guide groove provided in the guide block. This limits the freedom of deflection of the contacts on both sides of the fuse tube when they are pressed down, thereby ensuring that the L-shaped contacts on both sides of the fuse tube are straight and on the same plane. This not only avoids the scrapping of some products due to pressing and shaping after they are made into finished products, resulting in increased manufacturing costs, but also fully ensures that all L-shaped fuses delivered for installation and use will not have invisible cracks, thereby improving the safety and protection capabilities of the fuse during use and also helping to extend the service life of the fuse. Description of the drawings:

[0015] Figure 1 It is a schematic diagram of the external structure of the L-shaped fuse of the present invention.

[0016] Figure 2 It is an exploded schematic diagram of the components of an embodiment of the present invention.

[0017] Figure 3 It is a schematic diagram of the finished product structure of an embodiment of the present invention.

[0018] Figure 4 It is a schematic diagram of the appearance structure of the upper mold in an embodiment of the present invention.

[0019] Figure 5It is a schematic diagram of the appearance structure of the lower mold according to an embodiment of the present invention.

[0020] Figure 6 It is a schematic diagram of the appearance structure of the base according to an embodiment of the present invention.

[0021] Figure 7 It is a schematic diagram of the appearance structure of the guide block according to an embodiment of the present invention.

[0022] Explanation of the accompanying symbols: 1. Upper fixing bolt; 2. Upper mold fixing plate; 3. Upper mold; 4. Spring; 5. Guide column; 6. Lower mold; 7. Lower mold fixing plate; 8. Fixing screw; 9. Base; 10. Locking bolt; 11. Fuse; 12. Guide block; 13. Stop block; 14. Fine-tuning wedge; 15. Lower fixing bolt; 311. Spare screw hole for upper mold; 312. Guide groove; 313. Guide column through hole; 314. Spare screw hole; 611. Fuse contact slot; 612. Guide column through hole; 613. Bolt hole; 615. Spare screw hole; 911. Stop block bolt through hole; 912. Guide block insertion slot; 913. Lower mold mounting bolt through hole; 914. Locking screw hole; 915. Garbage chute hole; 121. Fuse contact guide groove. Specific implementation method:

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] Examples, such as the attached Figures 2 to 6 As shown, an L-shaped fuse shaping pressing mold includes an upper fixing bolt 1, an upper mold fixing plate 2, an upper mold 3, a spring 4, a guide column 5, a lower mold 6, a lower mold fixing plate 7, a fixing screw 8, a base 9, a locking bolt 10, a guide block 12, a stop block 13, a fine-tuning wedge 14, and a lower fixing bolt 15.

[0025] The mold installation and assembly method is carried out according to the following steps:

[0026] 1. Insert the guide post 5 through the guide post through-hole 612 on the lower die 6. Then, insert the fixing screw 8 through the bolt hole (not shown) on the lower die fixing plate 7 and the bolt hole 613 on the lower die. Connect and fix the lower die 6 to the lower die fixing plate 7. Then, insert the guide post 5 through the lower die 6 and fix it.

[0027] 2. Use the lower fixing bolt 15 to pass through the lower die mounting bolt through-hole 913 provided on the base 9, and then pass through the bolt hole on the lower die fixing plate to fix the lower die 6 to the base 9; then use the bolt to pass through the stopper bolt through-hole 912 and pass through the bolt hole (not marked in the figure) on the stopper 13 to install and fix the stopper 13 to the base 9;

[0028] 3. After the lower die 6 is installed, put the spring 4 on the guide post 5 for standby use, and then install the upper die kit;

[0029] 4. Pass the upper fixing bolt through the upper die fixing plate 2 and into the upper die 3 to connect and fix the upper die 3 and the upper die fixing plate 2, and then insert the guide post 5 into it;

[0030] 5. After the upper mold kit is installed, pass the guide pillars 5 through the guide pillar through-holes 313 provided on the upper mold 3 and the guide pillar through-holes (not shown in the figure) on the upper mold fixing plate 2, so that the upper and lower molds are connected as a whole through the guide pillars 5. This basically completes the installation of the mold.

[0031] Since the upper die set is equivalent to a movable slider, the upper die 3 and the upper die fixing plate 2 can also be installed in advance, and then the lower die assembly and the connection between the lower die and the base can be installed and fixed.

[0032] In terms of use, the L-shaped fuse shaping pressing die of the present invention is installed on the stamping machine equipment, the position is adjusted, and then the lower part of the guide block 12 is inserted into the guide block insertion groove 912 set on the base. The upper part of the guide block 12 is manually pushed to make it close to the lower die, and the stamping machine is started. The upper die is pressed to shrink the spring 4, and the upper part of the guide block 12 is inserted into the upper die guide groove 312. Check whether the height meets the regulations and whether the joint meets the requirements. If the height needs to be adjusted, the insertion degree of the fine-tuning wedge 14 can be moved to reach the appropriate height. After observing and confirming that it meets the requirements, press the stamping machine to stop pressing, the upper die loses power, the spring bounces up, and the upper die is lifted, and the upper part of the guide block 12 is withdrawn from the guide block insertion groove 12.

[0033] After the above trial molds are confirmed to be correct, the L-shaped contact part of the lower part of the fuse 11 that needs to be shaped and pressed is inserted into the fuse contact slot 611 of the lower mold 6, and then the guide block 12 is installed. When installing and placing, the guide block 12 has a certain inclination angle to facilitate the placement of the workpiece. After it is placed, gently push the guide block 12 to be perpendicular to the plane of the base 9, and observe that the rest of the fuse has been inserted into the fuse contact guide slot 121, and then start the stamping machine, press the upper mold to move downward, and make the guide block 12 and the upper L-shaped contact of the fuse in the fuse contact guide slot 121 inserted in the guide block 12 inserted into the guide block insertion slot 912; at this time, the L-shaped contact part of the lower part of the fuse has been inserted into the fuse contact slot 611 of the lower mold 6, and the upper part has been inserted into the guide block insertion slot 912, and the guide slot 121 of the upper mold 3 and the guide block 12 are engaged at the wedge angle to ensure that the guide The guide block 12 is parallel to the guide column 5, and the planar position of the two contacts is restricted by the plane of the guide block 12. Moreover, when the upper part of the mold is forced to stamp downward, the stopper 13 installed at the rear of the guide plate 12 restricts the reverse force generated when the guide plate 12 is forced to move the lower part of the guide plate 12 backward. In this way, the stamping machine stamps the upper die part, presses the upper die downward, and contracts the spring, and stamps it into place, so that the contacts 112 at both ends of the melting tube 111 are completely stamped into place, limiting the deflection freedom of the contacts on both sides of the melting tube when pressed down, ensuring that the shape and position of the pressed fuse workpiece reaches the ideal state, so that the L-shaped contacts on both sides of the melting tube are kept straight and on the same plane, so as to meet the requirements of installation and use, and fully contact the contact surface of the protected circuit terminal board, so that the contact resistance of the connection part is minimized, to ensure that the fuse plays its due rated protection role during the operation of the line or equipment. After the pressing is completed, press the stop button, the upper die 3 loses its force, the spring 4 bounces up, and the guide block 12 withdraws from the upper die guide groove. The pressed fuse 11 is taken out and another fuse 11 to be pressed is replaced. This operation is repeated to perform the shaping and pressing of the fuse 11.

[0034] The height of the wedge angles on the guide block 12 and the lower die guide block insertion slot 121 can be adjusted using a locking screw 10 and tightened with a nut (not shown). To adjust, insert the locking bolt through the locking screw hole 914 provided in the base, then rotate the nut externally to adjust the locking screw depth to the desired position. The length of the guide block 12, as well as the slot width and depth, can be customized to meet various product specifications. Placing fuse workpieces in the slot ensures safe, efficient, and high-quality operation.

[0035] In order to prevent the upper mold 3 from loosening or displacement due to the reverse force generated after the contact 112 on the fuse 11 of a larger specification is subjected to force during actual shaping and pressing, the present invention also provides a spare screw hole 314 on the upper mold 3, and a spare screw hole (not marked in the figure) is also provided on the corresponding upper mold fixing plate 2. When necessary, the screws are respectively inserted into the spare screw holes on the upper mold 2 and the upper mold fixing plate and tightened. This can strengthen the connection and fixing force between the upper mold 3 and the upper mold fixing plate 2, make the connection and fixing between the two more secure, and prevent and resist the action of external lateral forces that may cause the joint position of the two to loosen or move.

[0036] Since the arc-extinguishing filler usually filled in the melting tube 111 of the fuse 11 is quartz sand, quartz particles may be scattered during the shaping and stamping process. Therefore, the present invention also provides a garbage chute hole 915 on the side of the base 9, which is connected to the guide block insertion groove 912. When quartz sand is spilled into the block insertion groove and affects the normal use of the guide block 11, the quartz sand arc-extinguishing filler spilled from the melting tube 111 into the guide block insertion groove 912 during the installation of the fuse 11 can be cleaned through the garbage chute hole 915.

[0037] In summary, the L-shaped fuse shaping and pressing mold provided by the present invention, when manufacturing and installing the L-shaped fuse, limits the deflection freedom of the contacts on both sides of the fuse tube when they are pressed down through the guide blocks in the design scheme, thereby ensuring that the L-shaped contacts on both sides of the fuse tube are straight and on the same plane. This not only avoids the scrapping of some products due to pressing and shaping after they are made into finished products, resulting in increased manufacturing costs, but also fully ensures that all L-shaped fuses delivered for installation and use will not have invisible cracks, thereby improving the safety and protection capabilities of the fuse during use, and also helping to extend the service life of the fuse.

Claims

1. An L-shaped fuse shaping and pressing die, comprising an upper fixing bolt, an upper die fixing plate, an upper die, a spring, a guide post, a lower die, a lower die fixing plate, fixing screws, a base, a locking bolt, a guide block, an L-shaped fuse, a stopper, a fine-tuning wedge, and a lower fixing bolt; characterized in that: The upper die is fixed to the upper die fixing plate with upper fixing bolts, and the lower die is fixed to the lower die fixing plate with lower die fixing screws. A spring is installed between the upper and lower dies to ensure a certain distance between them, and a guide column is passed through the inner ring of the spring to connect the upper and lower dies and fix the position of the spring. The guide block is installed sideways between the upper and lower dies, and the stop block limits the position of the guide block and prevents demoulding. The fine-tuning wedge is located at the bottom of the guide block to adjust the height of the guide block. The lower die is connected to the base with fixing bolts and locked with locking bolts. The lower die is provided with a fuse contact slot; The guide block is provided with a groove for guiding and positioning the fuse.

2. The L-shaped fuse shaping and pressing die according to claim 1, characterized in that: The upper die is provided with a guide groove for inserting the guide block and a spare screw hole for positioning and limiting the guide block when needed to prevent displacement or loosening.

3. The L-shaped fuse shaping and pressing die according to claim 1, characterized in that: The upper die fixing plate is provided with guide holes and spare screw holes; the guide holes are used to insert guide posts, and the spare screw holes are used to strengthen the connection and installation reliability between the upper die and the upper die fixing plate.

4. The L-shaped fuse shaping and pressing die according to claim 1, characterized in that: A guide block insertion slot and a garbage slot hole are provided on the base. The guide block insertion slot is used to install the guide block. The garbage slot hole is connected to the guide block insertion slot and is used to clean the quartz sand arc extinguishing filler that falls from the melting tube into the guide block insertion slot during the installation of the fuse.

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