A combined knife device for automatically cutting the gate of injection molding products

Abstract

The present invention relates to a combined knife device for automatically shearing the gates of injection molded products, comprising a column, a tool assembly device provided on the column, and a hopper with an outlet located below the tool assembly device. The outlet of the hopper is connected to a hopper channel, the hopper channel is fixed to the column, and a drive assembly installed on the column passes through the outlet of the hopper and is connected to the tool assembly device. The tool assembly device includes a straight knife assembly, a straight shears assembly, a 90° curved shears assembly, and a curved shears assembly arranged around the column. The drive assembly includes four movable cylinders, which are respectively connected to the straight knife assembly, the straight shears assembly, the 90° curved shears assembly, and the curved shears assembly. The present invention can achieve high trimming accuracy while realizing high flexibility, and the automatic shearing of gates covers a wide range.

Description

Technical Field

[0001] The invention relates to the field of automobile exterior decoration, and more particularly to a combined knife device for automatically shearing a gate of an injection molded product. Background Art

[0002] With the diversification and personalization of new vehicle designs, traditional one-piece bumpers are becoming more complex and diverse. Grille products with surface treatments such as high-gloss, hot stamping, and high-gloss combined with leather grain are emerging and being manufactured. New materials, along with new processes, such as PC / ABS, PMMA / ASA, and PC / PET, offer superior toughness and hardness. However, these materials create relatively hard gates, and their removal poses a major challenge for the industry.

[0003] The early manual shearing method, in which workers trimmed the gates of injection molded products, increased labor intensity when trimming gates made of harder materials. In addition, the trimming degree and accuracy of the gates were inconsistent, resulting in poor aesthetics and stability.

[0004] The blade of a conventional straight knife, which subsequently emerged, features a handle and a blade with a length of 10-20 mm on both sides. The blade has an inclined cutting edge at the front, forming an angle of 10-20° along the axis of the blade. While conventional straight knives can trim the side gates of common PP injection molded parts, they require more space for other types of gates. This is particularly true when trimming C-shaped anti-shrink gates on bumper-molded parts and sub-gating gates on grille-molded parts, as the blade's retaining rod interferes with the part, preventing trimming. Furthermore, conventional straight knives are unable to trim the gates of harder injection molded parts such as PC / ABS, PMMA / ASA, and PC / PET.

[0005] As mold technology matures, in-mold gate trimming is becoming increasingly common. This process involves shearing or squeezing the gate before the mold opens. This process is automated and complete within the mold, enabling part-to-part separation after the mold opens. This method can achieve gate trimming for injection molded parts made of harder materials such as PC / ABS, PMMA / ASA, and PC / PET. However, it suffers from performance instability. The in-mold gate trimming process is undetectable, making it prone to incomplete gate trimming, necessitating a second manual trimming step and even creating the risk of mold collision. Furthermore, in-mold gate trimming increases trimming time and cycle time. Furthermore, the gate can easily fall into the injection molding machine, making it difficult to clean.

[0006] As research and development progressed, a specialized punching tool emerged to trim the gates of injection molded products made of relatively rigid materials like PC / ABS, PMMA / ASA, and PC / PET. This specialized punching tool includes a basic integral frame, pre-pressing mechanism, punching mechanism, positioning mechanism, switch button assembly, safety light curtain, electrical control box, waste channel, and waste bin. Its development cost is high (up to 155,000 yuan) and it occupies a large footprint (measuring 2500mm × 1100mm × 2000mm). Furthermore, this specialized punching tool requires manual operation, resulting in relatively high labor costs and hindering the development of fully automated injection molding processes. Furthermore, this specialized punching tool is only suitable for specific products and can only trim the gates of these products, limiting its scope of application. For newly developed products, the punching tool must be redeveloped. Even if the original gate configuration is retained, this will narrow the process design window and even affect the injection molding cycle. In addition, when spoiler products are put in or taken out, their surfaces are prone to contact and collision with the frame, pre-pressing mechanism, punching mechanism, and positioning mechanism in the special machine punching tooling, and the degree of flexibility is low, resulting in bumps, collisions, scratches, and other problems that do not meet quality requirements and are scrapped, resulting in a low pass rate. Summary of the Invention

[0007] In order to solve the above-mentioned problems in the prior art, the present invention provides a combination knife device for automatically cutting the gate of injection molding products. It has a high degree of flexibility and can be applied to different types of gates. It can reduce development costs and labor costs, and at the same time can achieve high-precision trimming and improve the pass rate.

[0008] The present invention provides a combination knife device for automatically shearing the gate of an injection molded product, comprising a column, a tool assembly device and a hopper with an outlet located below the tool assembly device on the column, the outlet of the hopper being connected to a hopper channel, the hopper channel being fixed to the column, and a drive assembly installed on the column passing through the outlet of the hopper and connected to the tool assembly device; wherein, the tool assembly device comprises a straight knife assembly, a straight scissors assembly, a 90° curved scissors assembly and a curved scissors assembly arranged around the column, and the drive assembly comprises four movable cylinders, and the four movable cylinders are respectively connected to the straight knife assembly, the straight scissors assembly, the 90° curved scissors assembly and the curved scissors assembly.

[0009] Furthermore, the straight knife assembly includes a first lifting guide rail installed on the column, a rotation control mechanism connected to the first lifting guide rail, a first rotation adjustment block connected to the rotation control mechanism, and a straight knife connected to the first rotation adjustment block through a straight knife rod, and the first lifting guide rail is connected to a movable cylinder in the drive assembly.

[0010] Furthermore, the rotation control mechanism includes a rotating cylinder, a rotating connecting block connected to the rotating cylinder, and a rotating fixing block connected to the rotating connecting block, and the rotating fixing block is connected to the first connecting rod.

[0011] Furthermore, the straight scissors assembly includes a second lifting guide rail installed on the column, a second rotation adjustment block connected to the second lifting guide rail through a first mounting seat, a first sliding mechanism connected to the second rotation adjustment block, and a straight scissors connected to the first sliding mechanism, and the second lifting guide rail is connected to a movable cylinder in the drive assembly.

[0012] Furthermore, the first sliding mechanism includes a first cylinder body, which is fixedly connected to the straight scissors and installed on the first base through a first cylinder body fixing block; the first base is connected to the first fixed plate and is slidingly connected to the first guide rail-slider assembly; the first fixed plate is connected to the first clamping cylinder dual mechanism.

[0013] Furthermore, the 90° curved scissors assembly includes a third lifting guide rail installed on the column, a third rotation adjustment block connected to the third lifting guide rail through a second mounting seat, a second sliding mechanism connected to the third rotation adjustment block, and a 90° curved scissors connected to the second sliding mechanism, and the third lifting guide rail is connected to a movable cylinder in the drive assembly.

[0014] Furthermore, the second sliding mechanism includes a second cylinder body, which is fixedly connected to the 90° bent scissors and is installed on a second base through a second cylinder body fixing block; the second base is connected to a second fixed plate and is slidingly connected to a second guide rail-slider assembly; the second fixed plate is connected to a second clamping cylinder dual mechanism.

[0015] Furthermore, the curved scissors assembly includes a fourth lifting guide rail installed on the column, a fourth rotation adjustment block connected to the fourth lifting guide rail through a third mounting seat, a third sliding mechanism connected to the fourth rotation adjustment block, and a curved scissors connected to the third sliding mechanism, and the fourth lifting guide rail is connected to a movable cylinder in the drive assembly.

[0016] Furthermore, the third sliding mechanism includes a third cylinder body, which is fixedly connected to the curved scissors and installed on the third base through a third cylinder body fixing block; the third base is connected to the third fixed plate and is slidingly connected to the third guide rail-slider assembly; the third fixed plate is connected to the third clamping cylinder dual mechanism.

[0017] The combined knife device for automatically shearing the gates of plastic products of the present invention adopts a retractable four-tool group, controls the raising of the working knife through a cylinder, and utilizes a rotary adjustment block, a guide rail-slider assembly and a mounting seat with an adjustable tilt angle. When trimming large resin products such as PP bumper injection moldings, PC / ABS spoiler injection moldings, grille injection moldings, and PMMA / ASA grille injection moldings, it can achieve high trimming accuracy while realizing high flexibility, and the automatic shearing gate covers a wide range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a combined knife device for automatically shearing a gate of an injection molded product.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure of the straight knife assembly and the straight scissors assembly with a protective cover.

[0020] Figure 3 yes Figure 1 Schematic diagram of the structure of the straight knife assembly and the straight scissors assembly with the protective cover removed.

[0021] Figure 4 yes Figure 1 Schematic diagram of the structure of the 90° curved scissors assembly with a protective cover and the curved scissors assembly.

[0022] Figure 5 yes Figure 1 Schematic diagram of the structure of the 90° curved scissors assembly and the curved scissors assembly with the protective cover removed. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings and described in detail.

[0024] like Figure 1 As shown, the present invention provides a combination knife device for automatically shearing the gate of an injection molded product, comprising a column 1, the lower portion of which is fixed to the ground or an operating table by a bracket 11, the upper portion of which is provided with a tool assembly device 2 and a conical hopper 3 with an outlet located below the tool assembly device 2, the outlet of the hopper 3 being connected to the hopper channel 4, the hopper channel 4 being fixed to the column 1 by a number of fixing blocks 41, and a drive assembly 5 installed on the column 1 passing through the outlet of the hopper 3 and connected to the tool assembly device 2. After the combination knife device of the present invention automatically shears, the sheared gate enters the hopper channel 4 through the outlet of the hopper 3 and falls. In order to allow the gate to slide smoothly into the hopper channel 4, a material receiving baffle 6 can be installed at the connection position between the column 1 and the hopper 3. In addition, in order to connect the splint and the column 1, so that the combination knife device of the present invention can be transported, turned over and installed during construction and installation, a lifting ring 7 is provided at the top of the column 1.

[0025] The cutting tool assembly 2 includes a straight blade assembly 21, a straight scissors assembly 22, a 90° curved scissors assembly 23, and a curved scissors assembly 24, which are arranged around the pillar 1. The drive assembly 5 includes four movable cylinders, which are respectively connected to the straight blade assembly 21, the straight scissors assembly 22, the 90° curved scissors assembly 23, and the curved scissors assembly 24, so that the straight blade assembly 21, the straight scissors assembly 22, the 90° curved scissors assembly 23, and the curved scissors assembly 24 can all slide along the length of the pillar 1.

[0026] like Figure 2 and Figure 3 As shown, the straight knife assembly 21 includes a first lifting rail 211 mounted on the column 1, a rotation control mechanism 212 connected to the first lifting rail 211, a first rotation adjustment block 213 connected to the rotation control mechanism 212, and a straight knife 214 connected to the first rotation adjustment block 213. The first lifting rail 211 is connected to a movable cylinder in the drive assembly 5, the first rotation adjustment block 213 is connected to the rotation control mechanism 212 via a first connecting rod 215, and the straight knife 214 is fixedly connected to the first rotation adjustment block 213 via a straight knife rod 216. Furthermore, to prevent the straight knife assembly 21 from being jammed when the sheared gate falls, a first protective cover 217 is provided outside the rotation control mechanism 212. The rotation control mechanism 212 includes a rotating cylinder 2121, a rotating connecting block 2122 connected to the rotating cylinder 2121, and a rotating fixed block 2123 connected to the rotating connecting block 2122. The rotating fixed block 2123 is connected to the first connecting rod 215. At the same time, in order to limit the movement of the straight knife 214, the rotation control mechanism 212 is further provided with a first limit block 2124. The first limit block 2124 is used to mechanically limit the rotation cylinder 2121. Specifically, when the rotation cylinder 2121 rotates 90 degrees and hits the first limit block 2124, the rotation of the rotation cylinder 2121 stops.

[0027] As can be seen from the figure, the first rotation adjustment block 213 has seven mounting holes, two of which are located on the left side near the straight blade rod 216. Two set screws pass through these mounting holes, securing the straight blade rod 216 to the first rotation adjustment block 213. Loosening these two set screws allows the straight blade rod 216 to be adjusted upward or downward, thereby enabling vertical movement of the straight blade 214 in the Z direction. Of the other five mounting holes on the right side, one is located independently at the top, while the remaining four are arranged in an arc around this independently located mounting hole. Set screws pass through these independently located mounting holes, securing the first rotation adjustment block 213 to the top of the first connecting rod 215. One of the remaining four mounting holes can be selected as needed to securely connect to the first connecting rod 215 via set screws, enabling adjustment of the straight blade 214 to a specific angle, with the upper mounting hole as the center and the four lower mounting holes as the center. It should be understood that in other embodiments, a different number of mounting holes may be provided as needed.

[0028] The straight scissor assembly 22 includes a second lifting rail 222 mounted on the column 1 via a second stopper 221, a second rotation adjustment block 223 connected to the second lifting rail 222, a first sliding mechanism 224 connected to the second rotation adjustment block 223, and a straight scissor 225 connected to the first sliding mechanism 224. The second lifting rail 222 is connected to a movable cylinder in the drive assembly 5, the second rotation adjustment block 223 is connected to the second lifting rail 222 via a first mounting seat 226, the first sliding mechanism 224 is connected to the second rotation adjustment block 223 via a second connecting rod 227, and the straight scissor 215 is fixedly connected to the first sliding mechanism 224 via a removable fixing screw. Furthermore, to prevent the movement of the straight scissor assembly 22 from being blocked when the sheared gate falls, a second protective cover 228 is provided on the exterior of the first sliding mechanism 224. The second rotary adjustment block 223 has nine mounting holes. The principle of adjusting the straight scissors 215 using these nine mounting holes is similar to the principle of adjusting the straight blade 214 using the mounting holes on the first rotary adjustment block 213, with a slight difference: the first sliding mechanism 224 is first adjusted using the mounting holes on the second rotary adjustment block 223. Since the straight scissors 215 are fixedly connected to the first sliding mechanism 224, the adjustment of the straight scissors 215 is driven accordingly. It should be understood that in other embodiments, other numbers of mounting holes may be provided as needed.

[0029] The first sliding mechanism 224 includes a first cylinder 2241, which is fixedly connected to the straight scissors 215 and mounted on a first base 2243 via a first cylinder fixing block 2242. The first base 2243 is connected to a first fixing plate 2244, which is in sliding connection with a first guide rail-slider assembly 2245. The first fixing plate 2244 is connected to a first abutting cylinder dual mechanism 2246. The first guide rail-slider assembly 2245 includes a guide rail and two sliders, located at either end of the guide rail and acting as position limiters to restrict the sliding travel of the first base 2243. In this embodiment, the sliding travel range of the first base 2243 (i.e., the length of the guide rail between the two sliders) is 10 mm. The first clamping cylinder dual mechanism 2246 includes a clamping cylinder with a built-in spring. The spring in the clamping cylinder is connected to the first fixed plate 2244. Through the action of the spring, the first fixed plate 2244 drives the first base 2243 to slide on the guide rail in the first guide rail-slider assembly 2245, thereby driving the first cylinder body 2241 to slide.

[0030] The 90° curved scissors assembly 23 and the curved scissors assembly 24 are the same as the straight scissors assembly 22 , and thus have similar structures and movement principles.

[0031] Specifically, if Figure 4 and Figure 5 As shown, the 90° curved scissor assembly 23 includes a third lifting rail 232 mounted on the column 1 via a third stopper 231, a third rotation adjustment block 233 connected to the third lifting rail 232, a second sliding mechanism 234 connected to the third rotation adjustment block 233, and a 90° curved scissor 235 connected to the second sliding mechanism 234. The third lifting rail 232 is connected to a movable cylinder in the drive assembly 5, the third rotation adjustment block 233 is connected to the third lifting rail 232 via a second mounting base 236, the second sliding mechanism 234 is connected to the third rotation adjustment block 233 via a third connecting rod 237, and the 90° curved scissor 235 is fixedly connected to the second sliding mechanism 234 via a removable fixing screw. Furthermore, to prevent the movement of the 90° curved scissor assembly 23 from being blocked when the sheared gate falls, a third protective cover 238 is provided on the exterior of the second sliding mechanism 234. The third rotation adjustment block 233 has nine mounting holes, which are used to adjust the second sliding mechanism 234, thereby driving the adjustment of the 90° curved scissors 235. It should be understood that in other embodiments, other numbers of mounting holes may be provided as needed.

[0032] The second sliding mechanism 234 includes a second cylinder 2341, which is fixedly connected to the 90° curved scissors 235 and mounted on a second base 2343 via a second cylinder fixing block 2342. The second base 2343 is connected to a second fixing plate 2344, which is in sliding connection with a second guide rail-slider assembly 2345. The second fixing plate 2344 is connected to a second abutting cylinder dual mechanism 2346. The second guide rail-slider assembly 2345 comprises a guide rail and two sliders, located at either end of the guide rail and acting as position limiters to restrict the sliding travel of the second base 2343. In this embodiment, the sliding travel range of the second base 2343 (i.e., the length of the guide rail between the two sliders) is 10 mm. The second clamping cylinder dual mechanism 2346 includes a clamping cylinder with a built-in spring. The spring in the clamping cylinder is connected to the second fixed plate 2344. Through the action of the spring, the second fixed plate 2344 drives the second base 2343 to slide on the guide rail in the second guide rail-slider assembly 2345, thereby driving the second cylinder body 2341 to slide.

[0033] The curved scissor assembly 24 includes a fourth lifting rail 242 mounted on the column 1 via a fourth stopper 241, a fourth rotational adjustment block 243 connected to the fourth lifting rail 242, a third sliding mechanism 244 connected to the fourth rotational adjustment block 243, and a curved scissor 245 connected to the third sliding mechanism 244. The fourth lifting rail 242 is connected to a movable cylinder in the drive assembly 5, the fourth rotational adjustment block 243 is connected to the fourth lifting rail 242 via a third mounting seat 246, the third sliding mechanism 244 is connected to the fourth rotational adjustment block 243 via a fourth connecting rod 247, and the curved scissor 245 is fixed to the third sliding mechanism 244 via a removable fixing screw. Furthermore, to prevent the movement of the curved scissor assembly 24 from being blocked when the sheared gate falls, a fourth protective cover 248 is provided on the outside of the third sliding mechanism 244. The fourth rotational adjustment block 243 has nine mounting holes. These holes are used to adjust the third sliding mechanism 244, thereby driving the adjustment of the curved scissor 245. It should be understood that in other embodiments, other numbers of mounting holes may be provided as required.

[0034] The third sliding mechanism 244 includes a third cylinder 2441, which is fixedly connected to the curved scissors 245 and mounted on a third base 2443 via a third cylinder fixing block 2442. The third base 2443 is connected to a third fixing plate 2444, which is in sliding connection with a third guide rail-slider assembly 2445. The third fixing plate 2444 is connected to a third abutting cylinder dual mechanism 2446. The third guide rail-slider assembly 2445 includes a guide rail and two sliders. The two sliders are located at either end of the guide rail and serve as position limiters, limiting the sliding travel of the third base 2443. In this embodiment, the sliding travel range of the third base 2443 (i.e., the length of the guide rail between the two sliders) is 10 mm. The third clamping cylinder dual mechanism 2446 includes a clamping cylinder with a built-in spring. The spring in the clamping cylinder is connected to the third fixed plate 2444. Through the action of the spring, the third fixed plate 2444 drives the third base 2443 to slide on the guide rail in the third guide rail-slider assembly 2445, thereby driving the third cylinder body 2441 to slide.

[0035] The combined blade device of the present invention is suitable for front and rear bumper products (PP type), grille products (PP type, PC / ABS type, PMMA / ASA type) and spoiler products (PC / ABS type, PC / PET type). Its working process is as follows:

[0036] After a robotic arm with a gripper removes a product with a gate from an open mold, a specific tool assembly is selected through the robot control panel program based on the gate's form, material, size, spatial location, and shearing order. The robot then sequentially controls the cylinders connected to the straight knife assembly 21, the straight shear assembly 22, the 90° curved shear assembly 23, and the curved shear assembly 24, causing these four tool assemblies to rise or retract. For example, if a straight knife is needed to shear the gate, the cylinder connected to the straight knife assembly 21 is controlled to raise it to the top of the column 1, while the shear assemblies 22, 90° curved shear assembly 23, and curved shear assembly 24 retract to a position below the straight knife assembly 21. At this point, the straight knife assembly 21 is in operation, while the shear assemblies 22, 90° curved shear assembly 23, and curved shear assembly 24 are inactive. Furthermore, to prevent interference and failure during gate shearing, the straight knife assembly 21 is raised approximately 400 mm.

[0037] When the straight knife assembly 21 is in working condition, the straight knife 214 can be rotated 90° in the XY plane through the rotation control mechanism 212, the angle of the straight knife 214 in a certain plane of XZ or YZ can be adjusted through the first rotation adjustment block 213, and the straight knife 214 can be adjusted in the Z direction through the straight knife rod 216. Combined with the spatial coordinates of the product, the straight knife 214 is made close to the root of the gate, and the gate is removed by the movement of the trimming direction in the spatial point coordinate mode of the robot arm.

[0038] When the scissor assembly, such as the straight scissor assembly 22, is in operation, the angle of the straight scissor 225 can be adjusted in either the XZ or YZ plane using the second rotary adjustment block 223, while the height of the straight scissor 225 can be adjusted using the first cylinder fixing block 2242. This, combined with the spatial coordinates of the product, ensures that the straight blade 214 is in close contact with the root of the gate. Due to inevitable errors in the automated production process of automotive exterior products during mold opening on the injection molding machine, when the robot arm secures the mechanical gripper, when the mechanical gripper removes the part, and when the robot moves in space, the straight scissor assembly 22 can first be compressed toward the product using the first abutting cylinder dual mechanism 2246. Simultaneously, a linear guide with an additional 10mm stroke is used to ensure that the straight scissor 225 is in close contact with the root of the product's gate. Specifically, when the product deviates from the straight scissor 225, the abutting cylinder drives the straight scissor 225 to compensate for the deviation (the spring in the first abutting cylinder dual mechanism 2246 is compressible and the abutting cylinder is ejected), ensuring that the plane of the straight scissor 225 always aligns with the root of the product's gate. Then, the robot control panel program controls the first cylinder 241 to drive the straight scissors 225 to shear, so as to achieve a gate shearing accuracy within 0.02 mm.

[0039] After cutting off the gates required by the product in sequence, the robot places the product on the automatic conveyor belt and completes the cycle of the above steps after picking up the product next time.

[0040] The combined blade assembly of the present invention not only achieves high-precision shearing, but also allows the blade body to slide smoothly when trimming the gate of large resin products such as PP bumper injection molded parts, PC / ABS spoiler injection molded parts, grille injection molded parts, and PMMA / ASA grille injection molded parts, even when subjected to significant impact due to the hard material. Furthermore, the present invention utilizes a retractable straight blade, straight shears, 90° curved shears, and curved shears, and adds a rotary adjustment block, a guide rail-slider assembly, and a mounting seat to the blade assembly, enabling adjustment of the tilt angle and making trimming more flexible in space. The straight blade assembly incorporates not only a rotary adjustment block but also a connecting rod, a straight blade rod, and XY plane rotation, further increasing the coverage of the trimmed gate configuration.

[0041] In summary, the combined blade device of the present invention can shear different products, gate types, sizes, and materials. Furthermore, the development cost of the combined blade device of the present invention is approximately 70,000 yuan, and the processing cycle is approximately one month. Compared to existing dedicated punching tooling, the development cost is lower and the processing cycle is shorter. Furthermore, the combined blade device of the present invention can be operated fully automatically without human intervention, reducing labor costs; it can avoid scrapping due to bumps and scratches during the process, improving the process qualification rate; and it only needs to be installed above the hopper, taking up no space.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Various modifications are possible to the above embodiments of the present invention. In other words, any simple, equivalent changes and modifications made in accordance with the claims and description of the present invention are within the scope of protection of the present invention. Anything not fully described in this invention constitutes conventional technology.

Claims

1. A combined knife device for automatically cutting the gate of an injection molded product, characterized in that: The utility model comprises a column, wherein a tool assembly device and a hopper with an outlet located below the tool assembly device are provided on the column, the outlet of the hopper is communicated with a hopper channel, the hopper channel is fixed to the column, and a drive assembly installed on the column passes through the outlet of the hopper and is connected to the tool assembly device; wherein the tool assembly device comprises a straight knife assembly, a straight scissors assembly, a 90° curved scissors assembly and a curved scissors assembly arranged around the column, and the drive assembly comprises four movable cylinders, and the four movable cylinders are respectively connected to the straight knife assembly, the straight scissors assembly, the 90° curved scissors assembly and the curved scissors assembly; The straight knife assembly includes a first lifting guide rail mounted on the column, a rotation control mechanism connected to the first lifting guide rail, a first rotation adjustment block connected to the rotation control mechanism, and a straight knife connected to the first rotation adjustment block via a straight knife rod, wherein the first lifting guide rail is connected to a movable cylinder in the drive assembly; The straight scissors assembly includes a second lifting rail mounted on the column, a second rotation adjustment block connected to the second lifting rail via a first mounting seat, a first sliding mechanism connected to the second rotation adjustment block, and a straight scissors connected to the first sliding mechanism, wherein the second lifting rail is connected to a movable cylinder in the drive assembly; The 90° curved scissors assembly includes a third lifting rail mounted on the column, a third rotation adjustment block connected to the third lifting rail via a second mounting seat, a second sliding mechanism connected to the third rotation adjustment block, and a 90° curved scissors connected to the second sliding mechanism, wherein the third lifting rail is connected to a movable cylinder in the drive assembly; The curved scissors assembly includes a fourth lifting guide rail installed on the column, a fourth rotation adjustment block connected to the fourth lifting guide rail through a third mounting seat, a third sliding mechanism connected to the fourth rotation adjustment block, and a curved scissors connected to the third sliding mechanism. The fourth lifting guide rail is connected to a movable cylinder in the drive assembly.

2. The combined knife device for automatically cutting the gate of injection molded products according to claim 1 is characterized in that: The rotation control mechanism includes a rotating cylinder, a rotating connecting block connected to the rotating cylinder, and a rotating fixing block connected to the rotating connecting block, wherein the rotating fixing block is connected to the first connecting rod.

3. The combined knife device for automatically cutting the gate of injection molded products according to claim 1 is characterized in that: The first sliding mechanism includes a first cylinder body, which is fixedly connected to the straight scissors and installed on the first base through a first cylinder body fixing block; the first base is connected to the first fixed plate and is slidingly connected to the first guide rail-slider assembly; the first fixed plate is connected to the first clamping cylinder dual mechanism.

4. The combined knife device for automatically cutting the gate of an injection molded product according to claim 1, characterized in that: The second sliding mechanism includes a second cylinder body, which is fixedly connected to the 90° curved scissors and is installed on the second base through a second cylinder body fixing block; the second base is connected to the second fixed plate and is slidingly connected to the second guide rail-slider assembly; the second fixed plate is connected to the second clamping cylinder dual mechanism.

5. The combined knife device for automatically cutting the gate of injection molded products according to claim 1 is characterized in that: The third sliding mechanism includes a third cylinder body, which is fixedly connected to the curved scissors and installed on the third base through a third cylinder body fixing block; the third base is connected to the third fixed plate and is slidingly connected to the third guide rail-slider assembly; the third fixed plate is connected to the third clamping cylinder dual mechanism.

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