Small injection molding device capable of replacing mold

Abstract

The invention relates to the field of plastic processing equipment, in particular to a small injection molding device for replacing a mold. A small injection molding device capable of replacing a mold comprises a supporting box body, a supporting shell, a sliding frame, a heating conveying assembly, a discharging hopper, a gun nozzle, an octagonal frame, a rotating frame and the like, the supporting box body is fixedly connected with the supporting shell, the heating conveying assembly is arranged in the supporting shell, the supporting shell is slidably connected with the sliding frame, the discharging hopper is arranged on the supporting shell, and the gun nozzle is arranged on the octagonal frame. The bottom of the supporting shell is connected with a heating conveying assembly, a gun nozzle is arranged at the front end of the heating conveying assembly, the front end of the supporting shell is rotationally connected with an octagonal frame, and the outer ring of the octagonal frame is rotationally connected with a rotating frame. The multiple molds are installed through the octagonal frame, the mold replacement process is optimized, the molds are attached through the air cylinders, the material taking process is optimized, in the mold replacement process, through the telescopic cutting frame moving up and down, gun nozzles are cleaned, manual cleaning is not needed, and the production efficiency of plastic products during mold replacement is improved.

Description

Technical Field

[0001] The invention relates to the field of plastic processing equipment, in particular to a small injection molding device for replacing molds. Background Art

[0002] Injection molding machine, also known as injection molding machine or injection machine, is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. Its working principle is similar to that of a syringe for injection. It uses the thrust of a screw (or plunger) to inject the plasticized molten plastic into a closed mold cavity, and obtains the product after solidification. Injection molding machines can be widely used in many fields, including headlights, bumpers, doors, etc. in the automotive industry, various product shells, keyboards, buttons and other plastic accessories in the electronics industry, as well as medical and home appliance industries. Super-large injection molding machines can be used for super-large injection molded products in the fields of aerospace, automotive industry, military defense, petrochemical pipelines, transportation facilities, etc.

[0003] Small injection molding machines refer to those with smaller models, smaller product sizes, and relatively low production capacity. Small injection molding machines can also be used for the production of micro-precision parts, long-term or small batch orders, color plate production, laboratory test proofing, test mold production, dust-free workshop production, teaching and training, etc. There are two situations in the use scenarios of existing small injection molding machines. One is that the fixed mold is fixed to the nozzle, and the movable mold is fitted and separated from the fixed mold by hydraulic pressure. When taking out the product, not only the fixed mold and the movable mold need to be disassembled, but also other supporting components need to be disassembled, so it takes a lot of time to replace the mold. The second is that the fixed mold and the movable mold are fixed by bolts, and the mold is directly injected. After cooling, the mold is opened. Multiple molds are needed during production. The number of molds determines the efficiency of production, so the production efficiency is low. Moreover, when the melted injection particles are not injected into the mold in time and remain at the nozzle, they will quickly cool and solidify. Before connecting the mold, the nozzle needs to be cleaned and the solidified part needs to be cut off, which affects the production efficiency. Summary of the invention

[0004] In order to overcome the shortcomings of consuming a lot of time in changing molds, inconvenient nozzle cleaning and low production efficiency, a self-cleaning small injection molding device that is convenient for changing molds is provided.

[0005] A small injection molding device for replacing molds comprises a supporting box, a supporting shell, a sliding frame, a heating and conveying component, a lower hopper, a gun nozzle, an octagonal frame, a rotating frame, a fixed nut, a fixed mold, a movable mold, a pressurizing mechanism and a cutting component. The supporting box is fixedly connected with a supporting shell, a heating and conveying component is arranged in the supporting shell, a sliding frame is slidably connected with the supporting shell, a lower hopper is arranged on the supporting shell, the bottom of the supporting shell is connected with the heating and conveying component, a gun nozzle is arranged at the front end of the heating and conveying component, a through hole is opened on the supporting shell and is located below the gun nozzle, an octagonal frame is rotatably connected with the front end of the supporting shell, a rotating frame is rotatably connected with the outer ring of the octagonal frame, a fixed mold and a movable mold are slidably connected on the rotating frame, the gun nozzle connected to the heating and conveying component on the outer side of the fixed mold is threadedly connected, the inner side of the fixed mold is sealed with the movable mold, a fixed nut is threadedly connected with the outer end of the rotating frame, a pressurizing mechanism for pushing and pulling the movable mold is arranged at the front end of the supporting shell, and a cutting component for cleaning the gun nozzle is arranged below the octagonal frame.

[0006] Furthermore, the pressurizing mechanism includes a support frame, a cylinder, a guide block a, a guide frame a, a right-angle plate, a sliding hook plate, a round rod a, a connecting block and a connecting rod. The front end of the support shell is fixedly connected to the support frame, the support frame is located below the octagonal frame, a cylinder is installed on the support frame, a guide block a is provided at the end of the piston rod of the cylinder, a guide frame a is provided at the rear end of the support frame, a right-angle plate is provided on the guide frame a, a sliding hook plate is slidably connected to the guide block a, round rods a are provided on the left and right sides of the front end of the sliding hook plate, the round rod a is slidably connected to the right-angle plate of the guide frame a, a connecting block is fixedly connected to the front side of the movable mold, a connecting rod is provided between the connecting blocks, and the connecting rod is slidably connected to the sliding hook plate.

[0007] Furthermore, the cutting assembly includes a missing circular plate, a guide frame b, a guide frame c, a telescopic cutting frame, a round rod b, a transverse elastic member and a longitudinal elastic member. The inner top of the missing circular plate is fixedly connected to the outer bottom of the octagonal frame, and a plurality of notches are arranged at intervals on the outer bottom of the missing circular plate. The rear end of the guide frame b is fixedly connected to the supporting shell, the front end of the guide frame b is slidably connected to the guide frame c, and the front end of the guide frame c is slidably connected to the telescopic cutting frame. A round rod b is arranged at the bottom of the telescopic cutting frame, and the round rod b is slidably connected to the outer bottom of the missing circular plate. The front end of the top of the telescopic cutting frame contacts with a fixed mold. A transverse elastic member is sleeved on the guide frame b, one end of the transverse elastic member is connected to the guide frame b, and the other end is connected to the guide frame c. A longitudinal elastic member is sleeved on the guide frame c, one end of the longitudinal elastic member is connected to the guide frame c, and the other end is connected to the telescopic cutting frame.

[0008] Furthermore, the small injection molding device also includes an octagonal ring, a limit block, a guide block b, a pull rod and a limit spring. The octagonal ring is fixed to the bottom of the octagonal frame and is located on the upper surface of the support shell. The octagonal ring is provided with a plurality of grooves. The guide block b is fixed to the upper surface of the support shell. The pull rod is slidably connected to the guide block b. The inner end of the pull rod is connected to the limit block. The limit block is slidably connected to the groove of the octagonal ring. A limit spring is sleeved on the inner end of the pull rod. One end of the limit spring is connected to the guide block b, and the other end is connected to the limit block.

[0009] Furthermore, the small injection molding device also includes a collection frame and a handle. The collection frame is slidably connected to the support box body, and the top opening is located below the through hole of the support shell body. The collection frame is provided with handles at both ends.

[0010] Furthermore, the small injection molding device also includes a positioning rod and a semicircular plate. The positioning rod is fixed to the supporting shell, and the semicircular plate is slidably connected to the positioning rod. The two semicircular plates form a circle with a notch. The notch is located above the through hole of the supporting shell, and the inner wall of the semicircular plate is slidably connected to the outer side of the fixed mold.

[0011] Furthermore, the sliding frame is made of transparent material.

[0012] Furthermore, a baffle is provided on one side of the supporting box body to prevent the collection frame from sliding.

[0013] Furthermore, the heating and conveying assembly is composed of a screw conveyor and an electric heating ring. The screw conveyor is used to push the injection molding particles to move along the direction of rotation of the screw thread, and the electric heating ring is used to melt the injection molding particles passing through.

[0014] Furthermore, after the fixed mold and the movable mold are completely fitted together, exhaust holes are provided on the top, bottom, left and right sides for exhausting the gas in the fixed mold and the movable mold during injection molding, and also for rapidly cooling the liquid plastic.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The present invention installs multiple molds through an octagonal frame, thereby optimizing the process of replacing molds. The molds are fitted together by a cylinder without the need for additional fixation, thereby optimizing the material taking process. During the process of replacing the mold, the nozzle is cleaned by a telescopic cutting frame that moves up and down without the need for manual cleaning, thereby improving the production efficiency of plastic products when replacing the mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 It is a left view of the present invention.

[0019] Figure 3It is a schematic diagram of the three-dimensional structure of the heating and conveying assembly of the present invention.

[0020] Figure 4 It is a schematic diagram of the three-dimensional structure of the pressurizing mechanism of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of the cylinder, guide frame a and right-angle plate of the present invention.

[0022] Figure 6 It is a schematic diagram of the three-dimensional structure of the gun nozzle, the guide block a and the sliding hook plate of the present invention.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the cutting assembly of the present invention.

[0024] Figure 8 It is a three-dimensional structural schematic diagram of the telescopic cutting frame, the transverse elastic member and the longitudinal elastic member of the present invention.

[0025] Fig. 9 It is a schematic diagram of the three-dimensional structure of the octagonal frame, the octagonal ring and the limit block of the present invention.

[0026] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide block b, the pull rod and the limit spring of the present invention.

[0027] Fig.11 It is a schematic diagram of the three-dimensional structure of the positioning rod and the semicircular plate of the present invention.

[0028] The markings in the figure are: 1-support box, 11-support shell, 12-sliding frame, 13-heating conveying assembly, 131-lower hopper, 132-gun nozzle, 2-octagonal frame, 21-rotating frame, 211-fixed nut, 22-fixed mold, 23-movable mold, 3-pressurizing mechanism, 31-support frame, 32-cylinder, 33-guide block a, 34-guide frame a, 35-right angle plate, 36-sliding hook plate, 361-circular Rod a, 37-connecting block, 371-connecting rod, 4-cutting assembly, 41-missing circular plate, 42-guide frame b, 43-guide frame c, 44-telescopic cutting frame, 441-round rod b, 45-transverse elastic member, 46-longitudinal elastic member, 5-octagonal ring, 51-limiting block, 52-guide block b, 53-pull rod, 54-limiting spring, 6-collection frame, 61-handle, 7-positioning rod, 71-semicircular plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0030] Embodiment: A small injection molding device for replacing molds, such as Figure 1-Figure 6 As shown, it includes a support box 1, a support shell 11, a sliding frame 12, a heating and conveying component 13, a lower hopper 131, a gun nozzle 132, an octagonal frame 2, a rotating frame 21, a fixed nut 211, a fixed mold 22, a movable mold 23, a pressurizing mechanism 3 and a cutting component 4. The support box 1 is fixedly connected to the support shell 11, and the heating and conveying component 13 is arranged in the support shell 11. The sliding frame 12 is slidably connected to the support shell 11. The sliding frame 12 is made of transparent material to facilitate observation of the production process. The support shell 11 is provided with a lower hopper 131. The bottom of the support shell 11 is connected to the heating and conveying component 13. The front end of the heating and conveying component 13 is provided with a gun nozzle 132. The support shell 1 1 is provided with a through hole, which is located below the gun nozzle 132. The front end of the support shell 11 is rotatably connected with an octagonal frame 2, and the bottom of the octagonal frame 2 passes through the support shell 11. The outer ring of the octagonal frame 2 is rotatably connected with a rotating frame 21. The rotating frame 21 is slidably connected with a fixed mold 22 and a movable mold 23. The outer side of the fixed mold 22 is threadedly connected with the gun nozzle 132 connected to the heating and conveying component 13, and the inner side of the fixed mold 22 is sealed with the movable mold 23. The outer end of the rotating frame 21 is threadedly connected with a fixing nut 211, and the inner side of the fixing nut 211 contacts with the outer side of the fixed mold 22. A pressurizing mechanism 3 for pushing and pulling the movable mold 23 is provided at the front end of the support shell 11, and a cutting component 4 for cleaning the gun nozzle 132 is provided below the octagonal frame 2.

[0031] refer to Figure 3 The heating and conveying assembly 13 is composed of a screw conveyor and an electric heating ring. The screw conveyor is used to push the injection molding particles to move along the direction of the screw rotation, and the electric heating ring is used to melt the injection molding particles passing through. Figure 8 After the fixed mold 22 and the movable mold 23 are completely fitted together, there are exhaust holes on the top, bottom, left and right sides, which are used to discharge the gas in the fixed mold 22 and the movable mold 23 during injection molding, and are also used to quickly cool the liquid plastic.

[0032] like Figure 4-Figure 6As shown, the pressurizing mechanism 3 includes a support frame 31, a cylinder 32, a guide block a33, a guide frame a34, a right-angle plate 35, a sliding hook plate 36, a round rod a361, a connecting block 37 and a connecting rod 371. The front end of the support shell 11 is fixedly connected to the support frame 31, and the support frame 31 is located below the octagonal frame 2. The support frame 31 is mounted with a cylinder 32, and the piston rod end of the cylinder 32 is provided with a guide block a33. The rear end of the support frame 31 is provided with a guide frame a34, and the guide frame a34 is provided with a right-angle plate 35. The right angle of the right-angle plate 35 is vertically upward. The guide block a33 is slidably connected to the sliding hook plate 36. Round rods a361 are provided on the left and right sides of the front end of the sliding hook plate 36. The round rod a361 is slidably connected to the right-angle plate 35 of the guide frame a34. The front side of the movable mold 23 is fixedly connected to the connecting block 37, and a connecting rod 371 is provided between the connecting blocks 37. The connecting rod 371 is slidably connected to the sliding hook plate 36.

[0033] like Figure 7 and Figure 8 As shown, the cutting assembly 4 includes a missing circular plate 41, a guide frame b42, a guide frame c43, a telescopic cutting frame 44, a round rod b441, a transverse elastic member 45 and a longitudinal elastic member 46. The inner top of the missing circular plate 41 is fixedly connected to the outer bottom of the octagonal frame 2, and a plurality of notches are arranged at intervals on the outer bottom of the missing circular plate 41. The rear end of the guide frame b42 is fixedly connected to the support shell 11, and the front end of the guide frame b42 is slidably connected to the guide frame c43, and the front end of the guide frame c43 is slidably connected to the telescopic cutting frame 44. A round rod b441 is provided at the bottom of the telescopic cutting frame 44, and the round rod b441 is slidably connected to the outer bottom of the missing circular plate 41. The front end of the top of the telescopic cutting frame 44 contacts the fixed mold 22. A transverse elastic member 45 is sleeved on the guide frame b42. One end of the transverse elastic member 45 is connected to the guide frame b42, and the other end is connected to the guide frame c43. A longitudinal elastic member 46 is sleeved on the guide frame c43. One end of the longitudinal elastic member 46 is connected to the guide frame c43, and the other end is connected to the telescopic cutting frame 44. Figure 8 , the transverse elastic member 45 is in a compressed state.

[0034] The staff pushes open the sliding frame 12 and installs the corresponding mold according to the shape of the plastic product. The movable mold 23 is first installed on the octagonal frame 2, and then the fixed mold 22 is pushed in and the fixing nut 211 is tightened. Then the octagonal frame 2 is rotated to align the rear end of the fixed mold 22 with the nozzle 132 at the front end of the heating conveying assembly 13. Then the fixed mold 22 is pushed outward and the rotating frame 21 is rotated after contacting with the nozzle 132 to make the fixed mold 22 and the nozzle 132 threadedly connected. The cylinder 32 is opened to extend the piston rod outward. , pushing the sliding hook plate 36 to move backward. During the movement, the round rod a361 contacts the right-angle plate 35, causing the sliding hook plate 36 to rise along the guide block a33. After the rear end contacts the connecting rod 371, since the rear end of the sliding hook plate 36 is an inclined surface, the sliding hook plate 36 rises along the guide block a33 again. After passing the connecting rod 371, the sliding hook plate 36 falls from the guide block a33 and then hooks the connecting rod 371. After the rear end of the sliding hook plate 36 contacts the movable mold 23, , the sliding hook plate 36 continues to move, and the cylinder 32 makes the movable mold 23 and the fixed mold 22 fit closely through the sliding hook plate 36, and maintains a certain pressure, then the heating and conveying component 13 is turned on, and the injection molding particles are poured into the lower hopper 131, and the injection molding particles are pushed along the direction of the rotation of the thread through the screw conveyor of the heating and conveying component 13. When passing through the electric heating ring, the particles are melted by the heat released by the electric heating ring. A plurality of electric heating rings are provided to ensure that the injection molding particles are completely melted, and then the liquefied plastic enters the cavity formed by the fixed mold 22 and the movable mold 23, and spreads around. After the fixed mold 22 and the movable mold 23 are completely fitted, there are exhaust holes on the top, bottom, left and right sides, which can discharge the gas in the fixed mold 22 and the movable mold 23 during injection molding, and will not affect the flow of the liquid plastic. Moreover, when the liquid plastic enters the exhaust hole, due to the small diameter of the exhaust hole, a small part of the liquid plastic directly solidifies after contacting with the fixed mold 22 and the movable mold 23, thereby preventing the liquid plastic from further spreading.

[0035] After the injection molding is completed, the heating and conveying assembly 13 is closed. For a single injection molding, both the fixed mold 22 and the movable mold 23 are in a low temperature state, so the plastic inside can be cooled quickly and the surface solidifies quickly. The cylinder 32 can be directly opened to pull the piston rod back, and the connecting rod 371 is pulled by the sliding hook plate 36 to pull the movable mold 23 apart, so that the fixed mold 22 and the movable mold 23 are separated. The piston rod continues to move, and the round rod a361 at the front end of the sliding hook plate 36 contacts the right angle plate 35, so that the sliding hook plate 36 moves along the guide block a33. The sliding hook plate 36 rises and disengages from the connecting rod 371. The sliding hook plate 36 that continues to move passes through the rotating frame 21, and then the rotating frame 21 is rotated to release the threaded connection between the fixed mold 22 and the nozzle 132. The octagonal frame 2 is rotated, and the mold is replaced for the next injection molding. The previous plastic product will stick to the fixed mold 22 or the movable mold 23 because the fixed mold 22 and the movable mold 23 absorb the heat from the plastic. The plastic product will remain still for a period of time, and after the inside of the plastic product has completely cooled down, the plastic product is removed from the mold.

[0036] When the octagonal frame 2 is rotated, the missing circular plate 41 will also rotate accordingly. During injection molding, the missing part of the missing circular plate 41 contacts the round rod b441 at the bottom of the telescopic cutting frame 44. When the next mold is replaced, the completed part of the missing circular plate 41 contacts the round rod b441 at the bottom of the telescopic cutting frame 44. The round rod b441 moves along the bottom of the missing circular plate 41, thereby squeezing and sliding downward, pulling the telescopic cutting frame 44 to slide downward, and compressing the longitudinal elastic member 46. At this time, the fixed mold 22 has been separated from the gun nozzle 132, so the transverse elastic member 45 has returned to The guide frame c43 moves a distance to the rear end, so that the front end of the top of the telescopic cutting frame 44 is located above the gun nozzle 132. When the telescopic cutting frame 44 slides downward, the top of the telescopic cutting frame 44 cuts the plastic that is about to solidify at the gun nozzle 132. Since the plastic melted by the electric heating ring has fluidity and the electric heating ring is close to the gun nozzle 132, the plastic that automatically flows out is cut off. When the round rod b441 passes through the complete part of the missing circular plate 41, the longitudinal elastic member 46 rebounds, and the top of the telescopic cutting frame 44 leaves the gun nozzle 132. At this time, the next mold is located at the gun nozzle. The fixed mold 22 is pushed to connect with the cannon nozzle 132, and when the fixed mold 22 is rotated, the fixed mold 22 will squeeze the telescopic cutting frame 44, so that the telescopic cutting frame 44 and the guide frame c43 move backward, and the guide frame c43 squeezes the transverse elastic member 45, and the transverse elastic member 45 is in a compressed state. After the connection between the fixed mold 22 and the cannon nozzle 132 is completed, injection molding is performed through the cylinder 32 and the heating conveying component 13 to complete the production of plastic products. After the production is completed, all injection particles are pushed out through the heating conveying component 13, and then the heating is turned off. The conveying component 13 and the cylinder 32, the above process achieves the purpose of replacing the mold, and at the same time, multiple molds are installed through the octagonal frame 2, which optimizes the process of replacing the mold. The mold is fitted through the cylinder 32, and no additional fixation is required, which optimizes the material taking process. In the process of replacing the mold, the nozzle 132 is cleaned by the telescopic cutting frame 44 that moves up and down, and no manual cleaning is required, which improves the production efficiency of plastic products when replacing the mold. When the injection molding device is not in use, pull the sliding frame 12 to cover the octagonal frame 2, and use the cover plate to cover the lower hopper 131.

[0037] like Fig. 9 and Fig.10 As shown, it also includes an octagonal ring 5, a limit block 51, a guide block b52, a pull rod 53 and a limit spring 54. The octagonal ring 5 is fixedly connected to the bottom of the octagonal frame 2 and is located on the upper surface of the support shell 11. A plurality of grooves are arranged on the octagonal ring 5. The guide block b52 is fixedly connected to the upper surface of the support shell 11. The pull rod 53 is slidably connected in the guide block b52. The inner end of the pull rod 53 is connected to the limit block 51. The limit block 51 is slidably connected in the groove of the octagonal ring 5. A limit spring 54 is sleeved on the inner end of the pull rod 53. One end of the limit spring 54 is connected to the guide block b52, and the other end is connected to the limit block 51.

[0038] When the octagonal frame 2 is rotated to change the mold, the pull rod 53 is pulled out, and the pull rod 53 moves outward along the guide block b52, the limit block 51 leaves the octagonal ring 5 and compresses the limit spring 54. Then, after the octagonal frame 2 is rotated, the pull rod 53 is immediately released, and the limit spring 54 rebounds after being free from pressure, and the guide block b52 is fixed, thereby pushing the limit block 51 to move inward, so that the limit block 51 fits on the octagonal ring 5. After rotating 45 degrees, the limit block 51 is inserted into the groove of the octagonal ring 5 under the push of the rebound force of the limit spring 54, and the octagonal ring 5 is limited, so that the octagonal frame 2 cannot be rotated, and the next mold is also located directly in front of the nozzle 132.

[0039] like Figure 1 and Figure 2 As shown, it also includes a collection frame 6 and a handle 61. The collection frame 6 is slidably connected to the support box 1, and the top opening is located below the through hole of the support shell 11. The left and right ends of the collection frame 6 are provided with handles 61. Figure 2 A baffle is provided on one side of the supporting box body 1 to prevent the collection frame 6 from sliding.

[0040] When the movable mold 23 is pulled open, the plastic product may have cooled down, or the surface of the plastic product may be relatively smooth, so the movable mold 23 may fall directly after leaving. A through hole is opened in the middle of the supporting shell 11, so that the fallen plastic product can pass through the through hole and fall into the collecting frame 6. The collecting frame 6 is filled with cold water to achieve the function of buffering and cooling the plastic products. After the production is completed, the collecting frame 6 is pulled out by the handle 61 to take out the plastic products inside. When the collecting frame 6 is pushed in, the other end will be blocked by the baffle to limit the position of the collecting frame 6.

[0041] like Figure 2 and Fig.11 As shown, it also includes a positioning rod 7 and a semicircular plate 71. The positioning rod 7 is fixed to the supporting shell 11, and the semicircular plate 71 is slidably connected to the positioning rod 7. The two semicircular plates 71 form a circle with a notch, and the notch is located above the through hole of the supporting shell 11. The inner wall of the semicircular plate 71 is slidably connected to the outer side of the fixed mold 22. When the semicircular plate 71 contacts the fixed mold 22, the fixed mold 22 and the movable mold 23 fit together, so that no debris will fall into the inner cavity formed by the fixed mold 22 and the movable mold 23, thereby ensuring the production quality of the first workpiece during injection molding.

[0042] When the semicircular plate 71 contacts the fixed mold 22, the fixed mold 22 and the movable mold 23 fit together, so that no debris will fall into the inner cavity formed by the fixed mold 22 and the movable mold 23, ensuring the production quality of the first workpiece during injection molding. When the mold on the octagonal frame 2 needs to be replaced, the semicircular plate 71 is pulled up to make the semicircular plate 71 leave the positioning rod 7, and then the semicircular plate 71 is removed, the fixing nut 211 is unscrewed, the fixed mold 22 and the movable mold 23 are removed, and after replacing the mold to be used, the fixed mold 22 and the movable mold 23 are pushed to fit together, and the semicircular plate 71 is inserted.

[0043] The technical principles of the embodiments of the present invention are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the embodiments of the present invention and cannot be interpreted in any way as limiting the protection scope of the embodiments of the present invention. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the embodiments of the present invention without creative work, and these methods will fall within the protection scope of the embodiments of the present invention.

Claims

1. A small injection molding device for changing molds, Its characteristics are: The invention comprises a support box (1), a support shell (11), a sliding frame (12), a heating and conveying assembly (13), a lower hopper (131), a nozzle (132), an octagonal frame (2), a rotating frame (21), a fixed nut (211), a fixed mold (22), a movable mold (23), a pressurizing mechanism (3) and a cutting assembly (4); the support box (1) is fixedly connected to the support shell (11); a heating and conveying assembly (13) is arranged in the support shell (11); a sliding frame (12) is slidably connected to the support shell (11); a lower hopper (131) is arranged on the support shell (11); the bottom of the support shell (11) is connected to the heating and conveying assembly (13); a nozzle (132) is arranged at the front end of the heating and conveying assembly (13); 32), a through hole is opened on the support shell (11) and is located below the gun nozzle (132), the front end of the support shell (11) is rotatably connected to an octagonal frame (2), the outer ring of the octagonal frame (2) is rotatably connected to a rotating frame (21), the rotating frame (21) is slidably connected to a fixed mold (22) and a movable mold (23), the outer side of the fixed mold (22) is threadedly connected to the gun nozzle (132) connected to the heating and conveying component (13), the inner side of the fixed mold (22) is sealedly connected to the movable mold (23), the outer end of the rotating frame (21) is threadedly connected to a fixing nut (211), the front end of the support shell (11) is provided with a pressurizing mechanism (3) for pushing and pulling the movable mold (23), and a cutting component (4) for cleaning the gun nozzle (132) is provided below the octagonal frame (2).

2. A small injection molding device for replacing molds according to claim 1, Its characteristics are: The pressurizing mechanism (3) comprises a support frame (31), a cylinder (32), a guide block a (33), a guide frame a (34), a right-angle plate (35), a sliding hook plate (36), a round rod a (361), a connecting block (37) and a connecting rod (371); the front end of the support housing (11) is fixedly connected to the support frame (31); the support frame (31) is located below the octagonal frame (2); the cylinder (32) is mounted on the support frame (31); the piston rod end of the cylinder (32) is provided with a guide block a (33); the support frame (31) ) is provided with a guide frame a (34) at the rear end, a right angle plate (35) is provided on the guide frame a (34), a sliding hook plate (36) is slidably connected to the guide block a (33), round rods a (361) are provided on the left and right sides of the front end of the sliding hook plate (36), the round rods a (361) are slidably connected to the right angle plate (35) of the guide frame a (34), a connecting block (37) is fixedly connected to the front side of the movable mold (23), a connecting rod (371) is provided between the connecting blocks (37), and the connecting rod (371) is slidably connected to the sliding hook plate (36).

3. A small injection molding device for replacing molds according to claim 2, Its characteristics are: The cutting assembly (4) comprises a circular plate (41), a guide frame b (42), a guide frame c (43), a telescopic cutting frame (44), a round rod b (441), a transverse elastic member (45) and a longitudinal elastic member (46); the inner top of the circular plate (41) is fixedly connected to the outer bottom of the octagonal frame (2); the outer bottom of the circular plate (41) is provided with a plurality of notches at intervals; the rear end of the guide frame b (42) is fixedly connected to the supporting shell (11); the front end of the guide frame b (42) is slidably connected to the guide frame c (43); the front end of the guide frame c (43) is slidably connected to the telescopic cutting frame (44) A round rod b (441) is arranged at the bottom of the telescopic cutting frame (44), and the round rod b (441) is slidably connected to the outer bottom of the missing circular plate (41). The front end of the top of the telescopic cutting frame (44) contacts the fixed mold (22). A transverse elastic member (45) is sleeved on the guide frame b (42), and one end of the transverse elastic member (45) is connected to the guide frame b (42), and the other end is connected to the guide frame c (43). A longitudinal elastic member (46) is sleeved on the guide frame c (43), and one end of the longitudinal elastic member (46) is connected to the guide frame c (43), and the other end is connected to the telescopic cutting frame (44).

4. A small injection molding device for replacing molds according to claim 3, Its characteristics are: The small injection molding device also includes an octagonal ring (5), a limit block (51), a guide block b (52), a pull rod (53) and a limit spring (54). The octagonal ring (5) is fixedly connected to the bottom of the octagonal frame (2) and is located on the upper surface of the support shell (11). A plurality of grooves are arranged on the octagonal ring (5). The limit block (51) is fixedly connected to the upper surface of the support shell (11). The pull rod (53) is slidably connected to the inside of the guide block b (52). The inner end of the pull rod (53) is connected to the limit block (51). The limit block (51) is slidably connected to the groove of the octagonal ring (5). The inner end of the pull rod (53) is sleeved with a limit spring (54). One end of the limit spring (54) is connected to the guide block b (52) and the other end is connected to the limit block (51).

5. A small injection molding device for replacing molds according to claim 4, Its characteristics are: The small injection molding device also includes a collection frame (6) and a handle (61). The collection frame (6) is slidably connected to the support box (1), and the top opening is located below the through hole of the support shell (11). The collection frame (6) is provided with handles (61) at both ends.

6. A small injection molding device for replacing molds according to claim 5, Its characteristics are: The small injection molding device also includes a positioning rod (7) and a semicircular plate (71), wherein the positioning rod (7) is fixedly connected to the supporting shell (11), and the semicircular plate (71) is slidably connected to the positioning rod (7), and the two semicircular plates (71) form a circle with a notch, wherein the notch is located above the through hole of the supporting shell (11), and the inner wall of the semicircular plate (71) is slidably connected to the outer side of the fixed mold (22).

7. A small injection molding device for replacing molds according to claim 6, Its characteristics are: The sliding frame (12) is made of transparent material.

8. A small injection molding device for replacing molds according to claim 7, Its characteristics are: A baffle is provided on one side of the supporting box (1) to prevent the collection frame (6) from sliding.

9. A small injection molding device for replacing molds according to claim 8, Its characteristics are: The heating and conveying assembly (13) is composed of a screw conveyor and an electric heating ring. The screw conveyor is used to push the injection molding particles to move along the direction of rotation of the screw thread, and the electric heating ring is used to melt the injection molding particles passing through.

10. A small injection molding device for replacing molds according to claim 9, Its characteristics are: After the fixed mold (22) and the movable mold (23) are completely fitted together, exhaust holes are provided on the top, bottom, left and right sides for exhausting the gas in the fixed mold (22) and the movable mold (23) during injection molding, and also for rapidly cooling liquid plastic.

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