A punching tool for injection molding a lamp housing

Abstract

The utility model discloses a kind of punching tool for injection molding lamp shell, including upper die, lower die and connecting rod lifting assembly, lower die is slidably connected on base, base is fixedly connected with rack, connecting rod lifting assembly includes first connecting rod and second connecting rod, the upper end of first connecting rod is rotatably connected in rack, and operating portion is fixedly connected on first connecting rod, the lower end of first connecting rod is rotatably connected with the upper end of second connecting rod, the lower end of second connecting rod is rotatably connected with upper die, the top of lower die is equipped with blanking hole, when down operating portion, the lower end of upper die will be punched into blanking hole, when lift operating portion, the lower end of upper die will move out from blanking hole. This tool can punch out cross-shaped excess material in the hole of plastic lamp shell conveniently and quickly, production rate is improved, pruning is complete, ensure the qualified rate, ensure the air tightness of lamp shell round hole, ensure the service life of headlamp.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a punching tool for injection molding lamp housings. Background Technology

[0002] After the plastic lamp housing is injection molded and punched using an injection molding machine, a cross-shaped excess material 6 will generally remain inside the round hole 5 of the lamp housing 4, such as... Figure 1 As shown, workers need to remove the cross-shaped excess material 6 before they can connect the other parts to the lamp housing.

[0003] The current method for removing cross-shaped excess material is manual trimming, which involves manually cutting off the excess material using pliers. This inevitably results in slow trimming speed and low production rate. In addition, manual trimming has the following drawbacks: manual trimming may result in incomplete trimming, making it impossible to guarantee the pass rate. It may also lead to potential airtightness issues in the round holes of the lamp housing, meaning that the connection and sealing between the round holes of the lamp housing and other components may be weak or have poor airtightness. This could lead to water entering the lamp housing during rainy weather or car washing, which could damage the headlight or PCB board, affecting the lighting effect and potentially damaging the internal modules of the headlight, thus affecting the lifespan of the headlight. Utility Model Content

[0004] The purpose of this invention is to provide a punching fixture for injection-molded lamp housings, which can conveniently and quickly punch away the cross-shaped excess material inside the holes of the plastic lamp housings, thereby increasing production speed, ensuring thorough trimming, guaranteeing the pass rate, ensuring the airtightness of the round holes in the lamp housings, and ensuring the service life of the headlights.

[0005] To achieve the above objectives, this utility model provides the following solution:

[0006] One aspect of this utility model provides a punching fixture for injection molding lamp housings, including an upper die, a lower die, and a linkage lifting assembly. The lower die is slidably connected to a base, and the base is fixedly connected to a frame. The linkage lifting assembly includes a first link and a second link. The upper end of the first link is rotatably connected to the frame, and an operating part is fixedly connected to the first link. The lower end of the first link is rotatably connected to the upper end of the second link, and the lower end of the second link is rotatably connected to the upper die. The top of the lower die is provided with a blanking hole. When the operating part is pressed down, the lower end of the upper die will be punched into the blanking hole. When the operating part is lifted, the lower end of the upper die will be moved out of the blanking hole.

[0007] Preferably, the frame includes two columns, a support plate, and two uprights fixedly connected from bottom to top. The lower ends of the two columns are symmetrically fixedly connected to both sides of the base, and the upper ends of the two columns are respectively fixedly connected to both sides of the support plate. The two uprights are respectively symmetrically fixedly connected to both ends of the support plate. A fixing plate is fixedly connected to the upper end of the two uprights. The fixing plate is connected to an upper limit plate by fastening bolts. One end of the upper limit plate is provided with a through hole, and the fastening bolts pass through the through hole and are connected to the fixing plate. The other end of the upper limit plate faces the operating part and is suspended.

[0008] The lower mold has a circumferential sidewall in the middle with an axially oriented protrusion. A support block is fixed above the support plate. The support block has a through hole in the middle. The support plate has a positioning hole in the middle. The through hole and the positioning hole are aligned. The lower end of the upper mold can pass through the through hole and the positioning hole in sequence. The shape of the through hole and the positioning hole is consistent with the cross-sectional shape of the middle part of the lower mold.

[0009] Preferably, a horizontally arranged first rotating shaft is fixed between the upper ends of the two upright plates, and the upper end of the first connecting rod is provided with a horizontal first mounting hole, through which the first rotating shaft passes.

[0010] Mounting blocks are fixed to the side of the two upright plates opposite to the operating part. A horizontal lower limit screw is connected to the middle of the mounting block. When the first connecting rod rotates downward around the first rotating axis so that the first connecting rod is in the vertical direction, the lower limit screw abuts against the first connecting rod.

[0011] Preferably, the first connecting rod is rotatably connected to the second connecting rod via the second rotating shaft. The lower end of the first connecting rod is provided with a first connecting rod protrusion, and the first connecting rod protrusion is provided with a second mounting hole. The upper end of the second connecting rod is provided with an upper groove, and the first connecting rod protrusion is accommodated in the upper groove. The two sides of the upper groove are respectively provided with a third mounting hole and a fourth mounting hole. The second rotating shaft passes through the third mounting hole, the second mounting hole and the fourth mounting hole in sequence.

[0012] Preferably, the second connecting rod is rotatably connected to the upper mold via a third rotating shaft. The lower end of the second connecting rod is provided with a lower groove, and the lower groove is provided with a fifth mounting hole and a sixth mounting hole on both sides. The upper end of the upper mold is provided with an upper protrusion, and the upper protrusion is provided with a seventh mounting hole. The upper protrusion is accommodated in the lower groove, and the third rotating shaft passes through the fifth mounting hole, the seventh mounting hole and the sixth mounting hole in sequence.

[0013] Preferably, the operating part includes a fixing block, the middle part of the first connecting rod is provided with an inclined groove, the fixing block is fixedly snapped into the inclined groove by bolts, the fixing block is connected to an extension rod, and the extension rod is connected to a handle.

[0014] Preferably, a first connecting hole is provided between the inclined groove and the first mounting hole of the first connecting rod, and a first support rod is screwed to the end of the first connecting hole away from the operating part. A second connecting hole is provided above the lower groove of the second connecting rod, and a second support rod is screwed to the end of the second connecting hole away from the operating part. A spring is fixedly connected between the first support rod and the second support rod.

[0015] Preferably, the base has a slide rail in the middle, the slide rail is located between the two columns, and the bottom of the lower mold has a protruding edge that can slide within the slide rail.

[0016] Preferably, a limiting bolt is provided at one end of the slide rail near the column, and a limiting block is provided at the slide rail opening at the end of the slide rail away from the column. The limiting block can seal the slide rail opening and is fixedly connected to the base by bolts. The base is also symmetrically provided with positioning blocks. The two positioning blocks are located on both sides of the slide rail and adjacent to the limiting bolt. The side of the positioning block near the lower mold is provided with an arc portion, which matches the outer surface of the injection molded shell.

[0017] Another aspect of this utility model provides a punching method for injection-molded lamp housings, wherein the punching method is implemented using the punching fixture for injection-molded lamp housings described above, and the punching method includes the following steps:

[0018] Step 1: Place the lamp housing cover onto the lower mold, aligning the lamp housing hole on the lamp housing with the blanking hole of the lower mold;

[0019] Step 2: Move the lamp housing along the slide rail toward the upper mold. When the outer surface of the lamp housing abuts against the arc of the positioning block, stop moving the lamp housing so that the lamp housing hole is directly below the upper mold.

[0020] Step 3: Press the handle down to make the first connecting rod rotate around the first pivot towards the inside of the two upright plates, while the second connecting rod rotates around the third pivot towards the inside of the two upright plates. The lower die moves down. When the first connecting rod rotates to the vertical direction, it abuts against the lower limit screw and stops rotating. At this time, the punching fixture is located at the lower pole position. The lower die passes through the round hole of the lamp housing and punches the cross-shaped excess material at the round hole of the lamp housing into the blanking hole of the lower die.

[0021] Step 4: Lift the handle upwards, causing the first connecting rod to rotate around the first pivot towards the outside of the two upright plates, while the second connecting rod rotates around the third pivot towards the outside of the two upright plates. The lower die moves upwards. When the extension rod connected to the handle abuts against the end of the upper limit plate, the first connecting rod stops rotating. At this time, the punching fixture is located at the upper extreme point, and the lower die is dislodged from the round hole in the lamp housing.

[0022] Step 5: Move the lamp housing along the slide rail in a direction away from the upper mold;

[0023] Step 6: Remove the lamp housing from the lower mold;

[0024] Step 7: Repeat steps 1 through 6.

[0025] The present invention achieves the following beneficial technical effects compared to the prior art:

[0026] The punching fixture for injection-molded lamp housings provided by this utility model, when the handle is pressed down, will drive the fixed block to move downward, thereby driving the first connecting rod to rotate around the first rotating shaft toward the inner side of the two upright plates, thereby driving the second connecting rod to rotate around the third rotating shaft toward the inner side of the two upright plates, thereby driving the lower die to move downward, so that the lower die moves downward in the positioning hole on the support plate, and then the tip of the lower die can pass through the lamp housing round hole, and punch the cross-shaped excess material on the lamp housing round hole into the blanking hole of the lower die. Similarly, when the handle is lifted upwards, the fixed block moves upwards, causing the first connecting rod to rotate around the first pivot towards the outer side of the two upright plates. This, in turn, causes the second connecting rod to rotate around the third pivot towards the outer side of the two upright plates, which in turn causes the lower die to move upwards. The lower die then moves upwards within the positioning hole on the support plate, allowing its tip to disengage from the lamp housing's circular hole. At this point, the stamped lamp housing can be removed from the lower die, and the next lamp housing to be stamped can be placed on top of the lower die. This pressing and lifting operation is repeated. This punching fixture can easily and quickly remove the cross-shaped excess material from the circular hole of the plastic lamp housing. Compared to manual trimming, this fixture offers higher production speed, more thorough trimming, and ensures a higher pass rate. Furthermore, the precision of the stamped lamp housing's circular hole is higher, ensuring its airtightness and extending the headlight's lifespan. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the lamp housing to be punched using the punching tool for injection molding lamp housing in this utility model.

[0028] Figure 2 This is a schematic diagram of the punching fixture used for injection molding lamp housings in this utility model;

[0029] Figure 3 This is a structural schematic diagram of the punching fixture used for injection molding lamp housings in this utility model from another angle.

[0030] Figure 4 This is a partial exploded structural diagram of the punching tool used for injection molding lamp housings in this utility model;

[0031] Figure 5 This is a cross-sectional view of the punching fixture for injection molding lamp housings in this utility model, wherein the fixture is located at the lower pole.

[0032] Figure 6 This is a cross-sectional view of the punching fixture for injection molding lamp housings in this utility model, wherein the fixture is located at the upper pole.

[0033] In the diagram: 1-Upper mold, 2-Lower mold, 3-Drop hole, 4-Lamp housing, 5-Lamp housing round hole, 6-Cross-shaped scrap, 7-Base, 8-Slide rail, 9-Protruding edge, 10-Frame, 11-Column, 12-Support plate, 13-Upright plate, 14-Positioning hole, 15-First connecting rod, 16-Second connecting rod, 17-First rotating shaft, 18-First mounting hole, 19-First connecting rod protrusion, 20-Second mounting hole, 21-Upper groove, 22-Third mounting hole, 23-Fourth mounting hole, 24-Second rotating shaft, 25-Lower groove, 26-Fifth mounting hole, 27-The 6-Mounting hole, 28-Upper protrusion, 29-Seventh mounting hole, 30-Third rotating shaft, 31-Fixing block, 32-Slanted groove, 33-Extending rod, 34-Handle, 35-First connecting hole, 36-First support rod, 37-Mounting block, 38-Second connecting hole, 39-Second support rod, 40-Lower limit screw, 41-Spring, 42-Upper limit plate, 43-Limit bolt, 44-Limit block, 45-Positioning block, 46-Arc portion, 48-Fixing plate, 49-Fastening bolt, 50-Long through hole, 51-Protruding strip, 52-Support block, 53-Through hole. Detailed Implementation

[0034] This utility model provides a punching fixture for injection-molded lamp housings, such as... Figures 2-6 As shown, the tooling includes an upper mold 1, a lower mold 2, and a connecting rod lifting assembly. The top of the lower mold 2 is provided with a blanking hole 3. Since there is usually a cross-shaped excess material 6 in the round hole 5 of the lamp housing 4 after injection molding, when using this tooling to remove the cross-shaped excess material 6 in the round hole 5 of the lamp housing, the lamp housing 4 can be covered on the lower mold 2, and the blanking hole 3 on the lower mold 2 is aligned with the round hole 5 of the lamp housing 4. Move the lower mold 2 and move it directly below the upper mold 1. Operate the connecting rod lifting assembly, and the connecting rod lifting assembly will drive the lower mold 2 to move downward. The tip of the lower mold 2 will be pressed into the blanking hole 3, and at the same time, the cross-shaped excess material 6 on the round hole 5 of the lamp housing will be removed.

[0035] Specifically, the lower mold 2 is slidably connected to the base 7. In this embodiment, the base 7 has a slide rail 8 in the middle and a protruding edge 9 at the bottom of the lower mold 2. The protruding edge 9 can slide within the slide rail 8, thereby realizing the movement of the lower mold 2 on the base 7. Moreover, the two sides of the protruding edge 9 that contact the slide rail 8 are flat, making the contact area between the protruding edge 9 and the slide rail 8 larger, making it less likely for the lower mold 2 to come out of the slide rail 8 when moving. The base 7 is fixedly connected to a frame 10. The frame 10 includes two columns 11, a support plate 12, and two upright plates 13 that are fixedly connected from bottom to top. The lower ends of the two columns 11 are symmetrically fixedly connected to both sides of the base 7. The slide rail 8 is located between the two columns 11. The upper ends of the two columns 11 are respectively fixedly connected to both sides of the support plate 12. The two upright plates 13 are respectively symmetrically fixedly connected to both ends of the support plate 12. The upper ends of the two upright plates 13 are fixedly connected to a fixing plate 48, which makes the connection structure of the frame 10 more stable. The linkage lifting assembly includes a first link 15 and a second link 16. A horizontally arranged first rotating shaft 17 is fixed between the upper ends of the two upright plates 13. The upper end of the first link 15 has a horizontally oriented first mounting hole 18. The first rotating shaft 17 passes through the first mounting hole 18, realizing the rotatable connection between the upper end of the first link 15 and the upright plate 13, and thus realizing the rotatable connection between the first link 15 and the frame 10. The lower end of the first link 15 has a first link protrusion 19, and the first link protrusion 19 has a second mounting hole 20. The upper end of the second link 16 has an upper groove 21, and the first link protrusion 19 is accommodated in the upper groove 21. The two sides of the upper groove 21 have a third mounting hole 22 and a fourth mounting hole 23, respectively. The second rotating shaft 24 passes through the third mounting hole 22, the second mounting hole 20, and the fourth mounting hole 23 in sequence, realizing the rotatable connection between the lower end of the first link 15 and the upper end of the second link 16. The lower end of the second connecting rod 16 is provided with a lower groove 25, and the lower groove 25 is provided with a fifth mounting hole 26 and a sixth mounting hole 27 on both sides. The upper end of the upper mold 1 is provided with an upper protrusion 28, and the upper protrusion 28 is provided with a seventh mounting hole 29. The upper protrusion 28 is accommodated in the lower groove 25. The third rotating shaft 30 passes through the fifth mounting hole 26, the seventh mounting hole 29 and the sixth mounting hole 27 in sequence, realizing the rotational connection between the lower end of the second connecting rod 16 and the upper mold 1. In addition, the first connecting rod 15 is fixedly connected to the operating part. Specifically, the operating part includes a fixing block 31. The middle part of the first connecting rod 15 is provided with a sloping groove 32. The fixing block 31 is fixedly snapped into the sloping groove 32 by bolts. The fixing block 31 is fixedly connected to an extension rod 33, and the extension rod 33 is fixedly connected to a handle 34, thus realizing the convenience of operating the operating part.

[0036] A fixed plate 48 is connected to an upper limit plate 42 by a fastening bolt 49. One end of the upper limit plate 42 has a long through hole 50, through which the fastening bolt 49 passes and connects to the fixed plate 48. The other end of the upper limit plate 42 faces the operating part and is suspended. When the handle 34 is lifted upward, the first connecting rod 15 rotates around the first pivot 17 toward the outside of the two upright plates. When the extension rod 33 abuts against the other end of the upper limit plate 42, the extension rod 33 stops lifting upward, and the first connecting rod 15 also stops rotating. Therefore, the other end of the upper limit plate 42 provides an upper limit for the upward movement of the first connecting rod 15. In addition, in this embodiment, the lower surface of the other end of the upper limit plate 42 is set as an arc surface, so that the friction between the two is relatively small and the wear is small. By setting the long through hole 50, the front and rear positions of the upper limit plate 42 can be adjusted according to the actual situation when installing the upper limit plate 42 to ensure that the upper limit plate 42 abuts against the extension rod 33 and ensures the upper limit function of the extension rod 33. Mounting blocks 37 are fixedly connected to the side of the two upright plates 13 opposite to the operating part. A horizontal lower limit screw 40 is connected to the middle of the mounting block 37. When the handle 34 is pressed down, the first connecting rod 15 will rotate around the first rotating shaft 17 toward the inside of the two upright plates. When the first connecting rod 15 rotates to the vertical direction, the first connecting rod 15 will abut against the lower limit screw 40. In this way, the lower limit screw 40 provides a lower limit for the downward movement of the first connecting rod 15.

[0037] In this embodiment, the lower mold 2 has a convex strip 51 arranged axially on the circumferential sidewall of the middle part. A support block 52 is fixedly connected above the support plate 12. The support block 52 has a through hole 53 in the middle part. The support plate 12 has a positioning hole 14 in the middle part. The through hole 53 and the positioning hole 14 are aligned. The lower end of the upper mold 1 can pass through the through hole 53 and the positioning hole 14 in sequence. The shape of the through hole 53 and the positioning hole 14 is consistent with the cross-sectional shape of the middle part of the lower mold 2. By setting the support block 52, the height of the upper mold 1 is limited in the circumferential direction. By setting the convex strip 51, the lower mold 2 is limited in the circumferential direction, which further ensures the alignment of the lower mold 2 with the lamp housing circular hole 5 and ensures the accuracy of stamping.

[0038] In this embodiment, when the handle 34 is pressed down, the fixing block 31 moves downward, which in turn causes the first connecting rod 15 to rotate around the first rotating shaft 17 toward the inside of the two upright plates, which in turn causes the second connecting rod 16 to rotate around the third rotating shaft toward the inside of the two upright plates, which in turn causes the lower mold 2 to move downward, so that the lower mold 2 moves downward in the positioning hole 14 on the support plate 12. When the first connecting rod rotates to the vertical direction, it stops rotating when it abuts against the lower limit screw 40. That is, the tooling is located at the lower pole. At this time, the tip of the lower mold 2 can pass through the lamp housing round hole 5 of the lamp housing 4 and press the cross-shaped excess material 6 on the lamp housing round hole 5 into the blanking hole 3 of the lower mold 2. Similarly, when the handle 34 is lifted upwards, it will cause the fixed block 31 to move upwards, which in turn will cause the first connecting rod 15 to rotate around the first rotating shaft 17 toward the outside of the two upright plates, which will in turn cause the second connecting rod 16 to rotate around the third rotating shaft toward the outside of the two upright plates, which will in turn cause the lower mold 2 to move upwards. When the extension rod abuts against the other end of the upper limit plate 42, the extension rod will no longer continue to lift upwards, and the first connecting rod will also stop rotating. That is, the tooling is located at the upper extreme point. At this time, the lower mold 2 moves upwards in the positioning hole 14 on the support plate 12, which will cause the tip of the lower mold 2 to come out of the lamp housing round hole 5 of the lamp housing 4. At this time, the stamped lamp housing 4 can be taken off from the lower mold 2, and the next lamp housing 4 to be stamped can be covered on the lower mold 2. The pressing and lifting operations are repeated in this way. This punching fixture can easily and quickly punch away the cross-shaped excess material 6 inside the round hole 5 of the plastic lamp housing 4. Compared with manual trimming, this fixture has a higher production rate, more thorough trimming, and ensures a higher pass rate. At the same time, the precision of the round hole 5 of the lamp housing after punching is higher, ensuring the airtightness of the round hole 5 of the lamp housing and ensuring the service life of the headlight.

[0039] A first connecting hole 35 is provided between the inclined groove 32 and the first mounting hole 18 of the first connecting rod 15. A first support rod 36 is screwed to the end of the first connecting hole 35 away from the operating part, and a first right support rod 37 is screwed to the right end of the first connecting hole 35. A second connecting hole 38 is provided above the lower groove 25 of the second connecting rod 16. A second support rod 39 is screwed to the end of the second connecting hole 38 away from the operating part. A spring 41 is fixedly connected between the first support rod 36 and the second support rod 39. By setting the spring 41, after the handle 34 is pressed down, the spring 41 will be compressed. When the handle 34 needs to be moved upward, the elastic force of the spring 41 will assist the handle 34 to move upward, making the operation of the handle 34 easier.

[0040] A limiting bolt 43 is provided at one end of the slide rail 8 near the column 11. The limiting bolt 43 is located on the bottom surface of the slide rail 8, which limits the movement of the lower mold 2 toward the upper mold 1, preventing the lower mold 2 from detaching from one end of the slide rail 8 when moving horizontally toward the upper mold 1, thus ensuring the reliability of the tooling. A limiting block 44 is provided at the opening of the slide rail 8 at the end away from the column 11. The limiting block 44 can seal the opening of the slide rail 8 and is fixedly connected to the base 7 by bolts. This limits the movement of the lower mold 2 away from the upper mold 1, preventing the lower mold 2 from detaching from the other end of the slide rail 8, further ensuring the reliability of the tooling.

[0041] The base 7 is also symmetrically equipped with positioning blocks 45. The two positioning blocks 45 are located on both sides of the slide rail 8 and are adjacent to the limiting bolts 43. The side of the positioning block 45 near the lower mold 2 has an arc portion 46, which matches the outer surface of the injection molded housing. Since the outer surface of the injection molded lamp housing 4 is arc-shaped, when the injection molded lamp housing 4 covers the lower mold 2, the lower mold 2 is moved and the lamp housing 4 is moved towards the upper mold 1. When the lower mold 2 moves directly below the upper mold 1 and the lower mold 2 is aligned with the lamp housing circular hole 5 on the lamp housing 4, the outer surface of the lamp housing 4 will abut against the arc portion 46 of the positioning block 45, and the front end of the lamp housing 4 will abut against the limiting bolts 43. This achieves precise positioning of the lamp housing 4 during punching and ensures the accuracy of punching. In addition, the upper part of the lower mold 2 is provided with a stepped portion, which conforms to the internal shape of the lamp housing 4, further ensuring the accuracy and stability of the lamp housing 4 covering the lower mold 2, and thus further ensuring the accuracy of punching.

[0042] This utility model also provides a punching method for injection-molded lamp housings. This punching method utilizes the punching fixture for injection-molded lamp housings described above, and includes the following steps:

[0043] Step 1: Cover the lamp housing 4 onto the lower mold 2, so that the lamp housing round hole 5 on the lamp housing 4 is aligned with the blanking hole 3 of the lower mold 2.

[0044] Step 2: Move the lamp housing 4 along the slide rail 8 toward the direction of the upper mold 1. When the outer surface of the lamp housing 4 abuts against the arc part 46 of the positioning block 45, the lamp housing 4 stops moving, so that the lamp housing hole 5 of the lamp housing 4 is located directly below the upper mold 1.

[0045] Step 3: Press down the handle 34 to make the first connecting rod 15 rotate around the first rotating shaft 17 toward the inside of the two upright plates, while the second connecting rod 16 rotates around the third rotating shaft toward the inside of the two upright plates. The lower die 2 moves downward. When the first connecting rod rotates to the vertical direction, it abuts against the lower limit screw 40 and the first connecting rod stops rotating. At this time, the punching fixture is located at the lower extreme point. The lower die 2 passes through the lamp housing round hole 5 on the lamp housing 4 and punches the cross-shaped excess material 6 at the lamp housing round hole 5 into the blanking hole 3 of the lower die 2.

[0046] Step 4: Lift the handle 34 upwards, causing the first connecting rod 15 to rotate around the first pivot towards the outside of the two upright plates, while the second connecting rod 16 rotates around the third pivot 30 towards the outside of the two upright plates. The lower die 2 moves upwards. When the extension rod connected to the handle abuts against the end of the upper limit plate 42, the first connecting rod stops rotating. At this time, the punching fixture is located at the upper extreme point, and the lower die 2 is away from the lamp housing round hole 5.

[0047] Step 5: Move the lamp housing along the slide rail in a direction away from the upper mold;

[0048] Step 6: Remove the lamp housing from the lower mold and punch the cross-shaped excess material at the round hole of the lamp housing;

[0049] Step 7: Repeat steps 1 through 6.

[0050] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A punching fixture for injection molding lamp housings, comprising an upper die, a lower die, and a connecting rod lifting assembly, characterized in that: The lower mold is slidably connected to the base, and the base is fixedly connected to the frame. The linkage lifting assembly includes a first link and a second link. The upper end of the first link is rotatably connected to the frame, and an operating part is fixedly connected to the first link. The lower end of the first link is rotatably connected to the upper end of the second link, and the lower end of the second link is rotatably connected to the upper mold. The top of the lower mold is provided with a material discharge hole. When the operating part is pressed down, the lower end of the upper mold will be pressed into the material discharge hole. When the operating part is lifted, the lower end of the upper mold will be moved out of the material discharge hole.

2. The punching fixture for injection-molded lamp housings according to claim 1, characterized in that: The frame includes two columns, a support plate, and two uprights fixedly connected from bottom to top. The lower ends of the two columns are symmetrically fixedly connected to both sides of the base, and the upper ends of the two columns are respectively fixedly connected to both sides of the support plate. The two uprights are respectively symmetrically fixedly connected to both ends of the support plate. The upper ends of the two uprights are fixedly connected to a fixing plate. The fixing plate is connected to an upper limit plate by fastening bolts. One end of the upper limit plate is provided with a through hole, through which the fastening bolts pass and are connected to the fixing plate. The other end of the upper limit plate faces the operating part and is suspended. A support block is fixedly connected to the top of the support plate. The support block has a through hole in the middle. The support plate has a positioning hole in the middle. The through hole and the positioning hole are aligned. The lower end of the upper mold can pass through the through hole and the positioning hole in sequence. The shape of the through hole and the positioning hole is similar to the cross-sectional shape of the middle part of the lower mold.

3. The punching fixture for injection-molded lamp housings according to claim 2, characterized in that: A horizontally arranged first rotating shaft is fixed between the upper ends of the two upright plates, and the upper end of the first connecting rod is provided with a first horizontal mounting hole, through which the first rotating shaft passes. Mounting blocks are fixed to the side of the two upright plates opposite to the operating part. A horizontal lower limit screw is connected to the middle of the mounting block. When the first connecting rod rotates downward around the first rotating axis so that the first connecting rod is in the vertical direction, the lower limit screw abuts against the first connecting rod.

4. The punching fixture for injection-molded lamp housings according to claim 3, characterized in that: The first connecting rod is rotatably connected to the second connecting rod via the second rotating shaft. The lower end of the first connecting rod is provided with a first connecting rod protrusion, and the first connecting rod protrusion is provided with a second mounting hole. The upper end of the second connecting rod is provided with an upper groove, and the first connecting rod protrusion is accommodated in the upper groove. The two sides of the upper groove are respectively provided with a third mounting hole and a fourth mounting hole. The second rotating shaft passes through the third mounting hole, the second mounting hole and the fourth mounting hole in sequence.

5. The punching fixture for injection-molded lamp housings according to claim 4, characterized in that: The second connecting rod is rotatably connected to the upper mold via the third rotating shaft. The lower end of the second connecting rod is provided with a lower groove, and the lower groove is provided with a fifth mounting hole and a sixth mounting hole on both sides. The upper end of the upper mold is provided with an upper protrusion, and the upper protrusion is provided with a seventh mounting hole. The upper protrusion is accommodated in the lower groove. The third rotating shaft passes through the fifth mounting hole, the seventh mounting hole and the sixth mounting hole in sequence.

6. The punching fixture for injection-molded lamp housings according to claim 5, characterized in that: The operating part includes a fixing block, and the middle part of the first connecting rod is provided with an inclined groove. The fixing block is fixedly snapped into the inclined groove by bolts. The fixing block is connected to an extension rod, and the extension rod is connected to a handle.

7. The punching fixture for injection-molded lamp housings according to claim 6, characterized in that: A first connecting hole is provided between the inclined groove and the first mounting hole of the first connecting rod. A first support rod is screwed to the end of the first connecting hole away from the operating part. A second connecting hole is provided above the lower groove of the second connecting rod. A second support rod is screwed to the end of the second connecting hole away from the operating part. A spring is fixedly connected between the first support rod and the second support rod.

8. The punching fixture for injection-molded lamp housings according to claim 2, characterized in that: The base is provided with a slide rail in the middle, which is located between the two columns. The bottom of the lower mold is provided with a protruding edge that can slide within the slide rail.

9. The punching fixture for injection-molded lamp housings according to claim 8, characterized in that: A limiting bolt is provided at one end of the slide rail near the column, and a limiting block is provided at the slide rail opening at the end of the slide rail away from the column. The limiting block can seal the slide rail opening and is fixedly connected to the base by bolts. The base is also symmetrically provided with positioning blocks. The two positioning blocks are located on both sides of the slide rail and adjacent to the limiting bolt. The side of the positioning block near the lower mold is provided with an arc portion, which matches the outer surface of the injection molded shell.

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