Water gap shearing device for injection molding

Abstract

The utility model relates to the field of injection molding processing equipment, in particular to a water gap shearing device for injection molding, which comprises a support frame, a lower mold, a rotating shaft, a guide rod, a mounting plate, an air cylinder, an upper mold, a cutter, a blanking component and the like, the rear end of the support frame is connected with the rotating shaft, the rotating shaft is rotatably connected with the lower mold, and the lower mold is placed on the support frame; a guide rod is connected to the supporting frame, a mounting plate is connected to the guide rod, an air cylinder is mounted on the mounting plate, the upper die is slidably connected to the guide rod, a piston rod of the air cylinder faces downwards and is connected to the top of the upper die, a plurality of cutters are connected to the side edge of the upper die, and a discharging assembly is connected between the lower die and the upper die. The automatic blanking device is used for automatically blanking injection products after water gap shearing. And through the wedge-shaped block and the contact block, the lower mold can be driven to obliquely ascend around the rotating shaft, an injection molding product can smoothly slide down along the sliding plate, and therefore the automatic discharging process is achieved.

Description

Technical Field

[0001] The utility model relates to the field of injection molding equipment, in particular to a nozzle shearing device for injection molding. Background Art

[0002] Injection molded products, also known as injection-molded products, are manufactured by heating and melting plastic in an injection molding machine, injecting it into a mold cavity, and then cooling the melt to solidify. During the injection molding process, the molten plastic must pass through specific channels to enter the mold. Therefore, sprue residues may remain on the finished product after molding. These residual sprues not only affect the product's appearance but may also compromise its performance, necessitating removal.

[0003] Currently, there are a variety of nozzle shearing devices on the market for removing residual nozzles from injection molded products. A nozzle shearing device for injection molded products, with announcement number CN212554878U, includes an upper mold and a lower mold. The upper wall of the lower mold is provided with a placement groove for placing the injection molded product. The placement groove is provided with a first cutter that can support the nozzle to be sheared. The upper mold is provided with a second cutter corresponding to the first cutter. Driven by a drive mechanism, the upper mold can drive the second cutter to move up and down between a position close to and a position away from the first cutter. The placement groove of the lower mold is provided with a first cutter, and the upper mold is provided with a second cutter corresponding to the first cutter. During operation, the injection molded product is first placed in the placement groove, and the nozzle to be sheared is supported by the first cutter. Then, the drive mechanism drives the upper mold to drive the second cutter to move closer to the first cutter, so that the nozzle is cut simultaneously through the cooperation of the first cutter and the second cutter, thereby achieving nozzle shearing.

[0004] Although existing nozzle shearing equipment is relatively mature, in actual production, the aforementioned patent requires workers to manually place the injection molded product onto the shearing equipment and then manually remove it after the equipment completes the shearing. This process not only increases workers' labor intensity but can also lead to product damage or poor shearing results due to human error, thus affecting production efficiency. Utility Model Content

[0005] In order to overcome the shortcoming of low efficiency of manual material feeding, the utility model provides a nozzle shearing device for automatic material feeding for injection molding.

[0006] A nozzle shearing device for injection molding comprises a support frame, a lower mold, a positioning rod, a rotating shaft, a guide rod, a mounting plate, a cylinder, an upper mold, a cutter and a blanking assembly. The rear end of the support frame is connected to the rotating shaft, and the lower mold is rotatably connected to the rotating shaft. The lower mold is placed on the support frame, and the lower mold is connected to the positioning rod for limiting the position of the injection molded product. The support frame is connected to the guide rod, and the guide rod is connected to the mounting plate. The cylinder is installed on the mounting plate, and the upper mold is slidably connected to the guide rod. When the lower mold contacts and cooperates with the upper mold, the piston rod of the cylinder faces downward and is connected to the top of the upper mold. Multiple cutters are connected to the side of the upper mold for shearing the nozzle of the injection molded product. A blanking assembly is connected between the lower mold and the upper mold for automatically blanking the injection molded product after the nozzle is sheared.

[0007] Optionally, the blanking assembly includes an extension bracket, a wedge block, a return spring and a contact block. The front end of the upper mold is connected to the extension bracket, and the wedge block is slidably connected to the extension bracket. A return spring is provided inside the wedge block, one end of the return spring is connected to the wedge block, and the other end is connected to the extension bracket. The front end of the lower mold is connected to the contact block, the inclined surface set at the front end of the contact block faces upward, and the inclined surface set at the rear end of the wedge block faces downward, and the wedge block and the contact block are squeezed together.

[0008] Optionally, it also includes a collecting bucket, a collecting box and a handle. The collecting bucket is connected to the bottom of the support frame, an opening is set in the middle of the collecting bucket, a collecting box is placed at the bottom of the opening, and a handle is connected to the collecting box for moving the collecting box.

[0009] Optionally, an observation window is further included. A transparent observation window is provided on the side of the collection box for directly observing the collection status of the injection molded products in the collection box.

[0010] Optionally, a protective pad is further included, and the positioning rod is connected to the protective pad to cushion the extrusion fit between the positioning rod and the injection molded product.

[0011] Optionally, a slide plate is further included. The lower mold is provided with the slide plate, and the slide plate has a smooth surface.

[0012] Optionally, a warning light is further included, and a warning light is installed on the mounting plate.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] Through the clever coordination of the wedge block and the contact block, after the cylinder drives the lower mold to contact the upper mold and complete the shearing action, the lower mold will be driven to tilt upward around the rotating axis, and the injection molded product can slide smoothly along the slide, thus realizing an automated unloading process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 This is a schematic diagram of the connection structure for placing injection molded products in the utility model.

[0017] Figure 3 This is a schematic diagram of the installation structure of the blanking component of the utility model.

[0018] Figure 4 This is a schematic diagram of the installation structure of the positioning rod, protection pad and collection box of the utility model.

[0019] Explanation of the reference numerals: 1: support frame, 101: injection molded product, 2: lower mold, 201: positioning rod, 3: rotating shaft, 4: guide rod, 5: mounting plate, 6: cylinder, 7: upper mold, 8: cutter, 9: extension bracket, 10: wedge block, 11: return spring, 12: contact block, 13: collecting bucket, 14: collecting box, 15: handle, 16: observation window, 17: protective pad, 18: slide plate, 19: warning light. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example: A nozzle shearing device for injection molding, such as Figures 1-4 As shown, it includes a support frame 1, a lower mold 2, a positioning rod 201, a rotating shaft 3, a guide rod 4, a mounting plate 5, a cylinder 6, an upper mold 7, a cutter 8 and a blanking assembly. The rear end of the support frame 1 is connected to the rotating shaft 3, and the lower mold 2 is rotatably connected to the rotating shaft 3. The lower mold 2 and the rotating shaft 3 are transitionally matched. The lower mold 2 is placed on the support frame 1, and the lower mold 2 is connected to the positioning rod 201 for limiting the position of the injection molded product 101. The support frame 1 is connected to the guide rod 4, and the guide rod 4 is connected to the mounting plate 5. The mounting plate 5 is equipped with a cylinder 6. The upper mold 7 is slidably connected to the guide rod 4. When the lower mold 2 is connected to the upper mold 7, When they are in contact, the injection molded product 101 can be fixed, and a sliding stroke is provided in the upper mold 7. After the mold 7 descends and fixes the injection molded product 101, it continues downward to complete the shearing work. The piston rod of the cylinder 6 faces downward and is connected to the top of the upper mold 7. Multiple cutters 8 are connected to the side of the upper mold 7 for cutting the water outlet of the injection molded product 101. The position of the positioning rod 201 and the number and position of the cutters 8 are set according to the injection molded product 101 to meet the shearing requirements of different injection molded products 101. A blanking component is connected between the lower mold 2 and the upper mold 7 for automatically blanking the injection molded product 101 after cutting the water outlet.

[0022] like Figure 2 and Figure 3 As shown, the blanking assembly includes an extension bracket 9, a wedge block 10, a return spring 11 and a contact block 12. The front end of the upper mold 7 is connected to the extension bracket 9, and the wedge block 10 is slidably connected to the extension bracket 9. The return spring 11 is sleeved inside the wedge block 10. One end of the return spring 11 is connected to the wedge block 10, and the other end is connected to the extension bracket 9. The front end of the lower mold 2 is connected to the contact block 12. The inclined surface of the front end of the contact block 12 faces upward, and the inclined surface of the rear end of the wedge block 10 faces downward. The wedge block 10 and the contact block 12 are squeezed together.

[0023] This device only uses the shearing process of a single injection molded product 101 as a reference. When used in factory production and processing, the device can be modified accordingly according to the shearing requirements. The staff puts the injection molded product 101 that needs to have the water outlet sheared on the lower mold 2 and aligns it through the positioning rod 201 to ensure that the water outlet of the injection molded product 101 is located directly below the cutter 8. For different injection molded products 101, the position and number of the water outlet are different, so the position of the positioning rod 201 on the lower mold 2 is also different, and the number and position of the cutters 8 installed on the upper mold 7 are also different to meet different shearing requirements. After the injection molded product 101 is placed, the cylinder 6 is turned on, and the cylinder 6 pushes the upper mold 7 to move downward along the guide rod 4. After the upper mold 7 is attached to the injection molded product 101, the cutter 8 contacts the water outlet, and the cutter 8 forms a shearing force with the edge of the lower mold 2 to complete the shearing of the water outlet. During the descending process of the upper mold 7, the inclined surface of the wedge block 10 is squeezed and matched with the inclined surface of the contact block 12. The wedge block 10 is pushed to slide forward, stretching the return spring 11. When the wedge block 10 passes the contact block 12, the return spring 11 rebounds, and the wedge block 10 is inserted into the bottom of the contact block 12. Then the cylinder 6 pulls the upper mold 7 upward to reset, and the wedge block 10 is against the contact block 12, and the lower mold 2 is driven to move upward through the contact block 12. Since the rear end of the lower mold 2 can rotate around the rotating shaft 3, the front end of the lower mold 2 gradually tilts during the upward movement. As the lower mold 2 tilts, the injection molded product 101 slides backward along the lower mold 2 due to its own weight, completing the discharge. As the inclination angle of the lower mold 2 gradually increases, the inclined surface of the contact block 12 no longer contacts the inclined surface of the wedge block 10. At this time, the return spring 11 rebounds, causing the wedge block 10 to gradually separate from the contact block 12. Due to the transition fit between the lower mold 2 and the rotating shaft 3, the rotating shaft 3 can provide a certain resistance during the natural fall of the lower mold 2, making the fall of the lower mold 2 more stable.

[0024] like Figure 2 and Figure 4 As shown, it also includes a collecting bucket 13, a collecting box 14 and a handle 15. The collecting bucket 13 is connected to the bottom of the support frame 1. An opening is provided in the middle of the collecting bucket 13. The collecting box 14 is placed at the bottom of the opening. The collecting box 14 is connected to the handle 15 for moving the collecting box 14.

[0025] The injection molded products 101 that slide down from the lower mold 2 fall into the collecting bucket 13 below. When multiple injection molded products 101 are sheared at the same time, the collecting bucket 13 can collect all the sliding injection molded products 101 at the same time. These injection molded products 101 slide toward the middle in the collecting bucket 13 and fall into the collecting box 14 after passing through the opening, completing the collection of the products. At the same time, the collecting box 14 can be easily moved through the handle 15 to a storage container or storage area.

[0026] like Figure 2 and Figure 4 As shown, an observation window 16 is also included. The side of the collection box 14 is provided with an observation window 16 made of a transparent material for directly observing the collection status of the injection molded products 101 in the collection box 14.

[0027] like Figure 3 and Figure 4 As shown, a protection pad 17 is also included. The positioning rod 201 is connected to the protection pad 17 to buffer the extrusion fit between the positioning rod 201 and the injection molded product 101.

[0028] The protection pad 17 can better protect the injection molded product 101 , especially ensure the surface quality of the injection molded product 101 .

[0029] like Figure 1 As shown, a slide plate 18 is also included. The lower mold 2 is covered with the slide plate 18, and the slide plate 18 has a smooth surface.

[0030] The smooth slide plate 18 allows the injection molded product 101 to slide more smoothly and can reduce friction loss at the bottom of the injection molded product 101.

[0031] like Figure 1 As shown, a warning light 19 is also included, and the warning light 19 is installed on the mounting plate 5.

[0032] When the cylinder 6 is working, especially during the shearing process, the warning light 19 lights up and makes a sound to remind the surrounding staff that the equipment is in working condition. If an abnormal situation occurs, the warning light 19 can also remind the surrounding staff in time and deal with it in time.

[0033] During operation, the molded product 101 to be sheared is first placed on the lower mold 2 and precisely aligned using the positioning rod 201 and its protective pad 17, ensuring that the sprue is directly below the cutter 8. Subsequently, the cylinder 6 drives the upper mold 7 downward, causing the cutter 8 to contact and shear the sprue of the molded product 101. Simultaneously, as the upper mold 7 descends, the wedge block 10 on the extension bracket 9 connected to its front end presses against the contact block 12 at the front end of the lower mold 2, pushing the wedge block 10 to slide and stretching the return spring 11. After shearing is completed, the cylinder 6 drives the upper mold 7 upward. At this time, the return spring 11 rebounds, causing the wedge block 10 to hook onto the contact block 12, driving the lower mold 2 to tilt upward around the rotating shaft 3. Due to its own weight, the molded product 101 slides backward along the slide 18 into the collection hopper 13. Simultaneously, the wedge block 10, pushed by the contact block 12, gradually disengages from the contact block 12, and the lower mold 2 steadily falls back under the resistance of the rotating shaft 3. The injection molded products 101 in the collection hopper 13 are guided to fall into the collection box 14. The collection status can be directly observed through the transparent observation window 16, and the collection box 14 can be easily moved through the handle 15. During the entire shearing process, the warning light 19 lights up and sounds to remind surrounding personnel that the equipment is in working condition.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nozzle shearing device for injection molding, characterized in that: The invention comprises a support frame (1), a lower mold (2), a positioning rod (201), a rotating shaft (3), a guide rod (4), a mounting plate (5), a cylinder (6), an upper mold (7), a cutter (8) and a blanking assembly. The rear end of the support frame (1) is connected to the rotating shaft (3). The rotating shaft (3) is rotatably connected to the lower mold (2). The lower mold (2) is placed on the support frame (1). The lower mold (2) is connected to the positioning rod (201) for limiting the position of the injection molded product (101). The support frame (1) is connected to the guide rod (4). The guide rod (4) is connected to the upper mold (7). A mounting plate (5) is provided, on which a cylinder (6) is mounted, and an upper mold (7) is slidably connected to a guide rod (4). When the lower mold (2) contacts and cooperates with the upper mold (7), the lower mold (2) is used to fix the injection molded product (101). The piston rod of the cylinder (6) faces downward and is connected to the top of the upper mold (7). A plurality of cutters (8) are connected to the side of the upper mold (7) for cutting the water outlet of the injection molded product (101). A blanking component is connected between the lower mold (2) and the upper mold (7) for automatically blanking the injection molded product (101) after the water outlet is cut.

2. A nozzle shearing device for injection molding according to claim 1, characterized in that: The blanking assembly comprises an extension bracket (9), a wedge block (10), a return spring (11) and a contact block (12); the front end of the upper mold (7) is connected to the extension bracket (9); the wedge block (10) is slidably connected to the extension bracket (9); the return spring (11) is sleeved inside the wedge block (10); one end of the return spring (11) is connected to the wedge block (10), and the other end is connected to the extension bracket (9); the front end of the lower mold (2) is connected to the contact block (12); the inclined surface of the front end of the contact block (12) faces upward, and the inclined surface of the rear end of the wedge block (10) faces downward, and the wedge block (10) and the contact block (12) are squeezed together.

3. A nozzle shearing device for injection molding according to claim 2, characterized in that: The utility model also comprises a collecting bucket (13), a collecting box (14) and a handle (15); the bottom of the support frame (1) is connected to the collecting bucket (13); an opening is provided in the middle of the collecting bucket (13); the collecting box (14) is placed at the bottom of the opening; the collecting box (14) is connected to the handle (15) for moving the collecting box (14).

4. A nozzle shearing device for injection molding according to claim 3, characterized in that: The collecting box (14) also includes an observation window (16) made of a transparent material, which is provided on the side of the collecting box (14) for directly observing the collection status of the injection molded products (101) in the collecting box (14).

5. A nozzle shearing device for injection molding according to claim 4, characterized in that: It also includes a protection pad (17), which is connected to the positioning rod (201) and is used to buffer the extrusion fit between the positioning rod (201) and the injection molded product (101).

6. A nozzle shearing device for injection molding according to claim 5, characterized in that: The lower mold (2) further comprises a slide plate (18). The slide plate (18) is laid on the lower mold (2). The slide plate (18) has a smooth surface.

7. A nozzle shearing device for injection molding according to claim 6, characterized in that: The utility model also comprises a warning light (19), and the warning light (19) is installed on the mounting plate (5).

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