Injection molding machine capable of reducing defective rate

Abstract

The invention discloses an injection molding machine capable of reducing the defective rate, and aims to solve the problem that the quality of a final product is affected due to the caking phenomenon during working of an existing injection molding machine. According to the technical scheme, the injection molding machine is characterized by comprising a rack and a charging barrel arranged on the rack, a feeding hopper is arranged at one end of the charging barrel, a discharging opening is formed in the other end of the charging barrel, a feeding area, a heating area and an injection area are sequentially arranged in the charging barrel from the feeding hopper to the discharging opening, and a heating device and an injection device are arranged in the heating area and the injection area respectively; the injection molding machine further comprises a box fixedly connected to the outer wall of the charging barrel, and a screening area located between the heating area and the injection area is arranged in the charging barrel. Raw materials and auxiliary materials can be heated and mixed through the heating device in the heating area, the caking phenomenon is reduced, meanwhile, caked materials can be blocked through the filter screens on the first filter frame and the second filter frame, and the situation that the caked materials enter the injection area and the box body to affect the quality of a final product is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding devices, and more particularly to an injection molding machine capable of reducing the defective product rate. 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.

[0003] The working process of the injection molding machine is generally to pour the raw materials and auxiliary materials into the feed hopper first, and then fall into the barrel through the feed hopper. The heated barrel and rotating screw generate shear heat to mix the raw materials and auxiliary materials and melt them into a viscous flow state. Then the screw pushes the molten plastic through the nozzle and injects it into the mold cavity. After pressure maintenance and cooling, it is solidified and formed. After the mold is cooled, it is opened, and the ejector device ejects and takes out the molded product from the mold to complete the injection molding work.

[0004] However, in the above process, when the raw materials and auxiliary materials are melted and mixed in the barrel, if the heating temperature inside the barrel is uneven, agglomeration will occur, affecting the quality of the final product. Therefore, a new solution needs to be proposed to solve this problem. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide an injection molding machine that can reduce the defective rate, so as to solve the defects existing in the above-mentioned background technology.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: an injection molding machine capable of reducing the defective rate, comprising a frame and a barrel arranged on the frame, wherein a feed hopper is arranged at one end of the barrel and a discharge port is arranged at the other end, and a feeding zone, a heating zone and an injection zone are arranged in sequence from the feed hopper to the discharge port inside the barrel, wherein the heating zone and the injection zone are respectively provided with a heating device and an injection device, and the injection zone and the discharge port are mutually conductive, and further comprising a box body fixedly connected to the outer wall of the barrel, wherein a screening zone located between the heating zone and the injection zone is arranged inside the barrel, wherein one side of the box body is mutually conductive with the screening zone through a connecting pipe, and the other side of the box body is mutually conductive with the injection zone through a through groove The two filter screens are connected to each other, a first filter frame is arranged in the screening area, a second filter frame is fixedly connected to the inner wall of the connecting pipe, filter screens are fixedly connected to the first filter frame and the second filter frame, two mounting seats are rotatably connected to the bottom of the first filter frame, a first limit plate and a second limit plate are fixedly connected to the inner wall of the barrel, the bottoms of the two mounting seats are connected to the first limit plate and the second limit plate through springs, the first limit plate is located below the second limit plate, and the positions of the first limit plate and the pipe mouth of the connecting pipe correspond to each other, a cleaning port connected to the screening area is opened on the outer wall of the barrel, a baffle is detachably connected to the cleaning port, and the positions of the second limit plate and the cleaning port correspond to each other.

[0007] The present invention is further configured as follows: the injection device includes a driving plate and a baffle plate slidably connected in the injection area, and a first cylinder and a second cylinder fixedly connected to the outer wall of the barrel, the piston rod in the first cylinder penetrates into the injection area and is fixedly connected to the driving plate, the piston rod in the second cylinder penetrates into the injection area and is fixedly connected to the baffle plate, a positioning plate corresponding to the position of the baffle plate is fixedly connected in the injection area, a switch 1 for controlling the operation of the first cylinder is arranged on the positioning plate, when the baffle plate and the switch 1 conflict with each other, the piston rod in the first cylinder extends and at this time the baffle plate isolates the screening area from the injection area, a control panel for controlling the operation of the second cylinder is arranged on the frame, a sensing component is arranged in the injection area, when the injection area is filled with mixed material, the sensing component transmits a signal to the control panel to drive the piston rod in the second cylinder to extend, an extension plate for blocking the through groove is slidably connected in the box body, a connecting rod is fixedly connected to the bottom end of the extension plate, a cross bar is fixedly connected to the side wall of the baffle plate, and the connecting rod and the cross bar are fixedly connected to each other.

[0008] The present invention is further configured as follows: the sensing component includes a base plate fixedly connected to the injection area, and a gravity sensor connected to a control panel is arranged on the base plate; when the weight of the mixed material in the injection area is greater than a preset value of the gravity sensor, the control panel drives the piston rod in the second cylinder to extend; a switch 2 connected to the control panel is arranged on the inner wall of the barrel near the discharge port; when the driving plate and the switch 2 conflict with each other, the control panel drives the piston rods in the first cylinder and the second cylinder to retract in sequence.

[0009] The present invention is further configured as follows: a sliding groove is provided on the inner wall of the barrel, and the blocking plate is slidably connected in the sliding groove.

[0010] The present invention is further configured as follows: a switch three is provided on the top of the first limit plate, a third cylinder connected to the switch three is provided on the outer wall of the box, the output end of the third cylinder passes through the interior of the box, and a connecting rod is fixedly connected to the output end of the third cylinder, a connecting plate is provided at one end of the connecting rod away from the third cylinder, and when the mounting seat and switch three conflict with each other, the output end of the third cylinder retracts to drive the connecting plate to separate from the connecting pipe.

[0011] The present invention is further configured as follows: a connecting plate is fixedly connected to a connecting seat on one side of the connecting rod, a rotating groove is provided on the connecting seat, a mounting rod is fixedly connected in the rotating groove, a mounting ring sleeved on the mounting rod is fixedly connected to the connecting rod, a contact block is fixedly connected to the top of the connecting rod, a connecting block is fixedly connected to the bottom of the connecting rod, an alarm is provided on the outer wall of the box body, a switch four connected to the alarm is provided on the abutment block, when the connecting plate and the connecting tube are in contact with each other, the connecting plate and the switch four conflict with each other, when the connecting plate and the switch four are separated, the alarm sounds, and when the connecting plate and the connecting tube are separated, the connecting plate is in an inclined state and conflicts with the connecting block.

[0012] The present invention is further configured as follows: the heating device includes a plurality of heating plates arranged on the barrel and a motor fixedly connected to the outer wall of the barrel, the motor and the heating plates are both controlled by a control panel, the output end of the motor is fixedly connected to a stirring rod that penetrates into the interior of the barrel, and a plurality of stirring blades are fixedly connected to the outer wall of the stirring rod.

[0013] In summary, the present invention has the following beneficial effects: The heating device in the heating zone can be used to heat and mix the raw materials and auxiliary materials to reduce the agglomeration phenomenon. At the same time, the filter screens on the first filter frame and the second filter frame can block the agglomerated materials to prevent them from entering the injection area and the box and affecting the quality of the final product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1The structure of the present invention is schematically shown Figure 1 ; Figure 2 The structure of the present invention is schematically shown Figure 2 ; Figure 3 The structure of the present invention is schematically shown Figure 3 ; Figure 4 for Figure 2 A in the enlarged view; Figure 5 for Figure 2 The enlarged view of point B in the figure; Figure 6 The structure of the present invention is schematically shown Figure 4 .

[0015] In the figure: 1, frame; 2, barrel; 3, feed hopper; 4, discharge port; 5, box; 6, connecting pipe; 7, through slot; 8, first filter frame; 9, second filter frame; 10, filter screen; 11, mounting seat; 12, first limit plate; 13, second limit plate; 14, spring; 15, cleaning port; 16, baffle; 17, drive plate; 18, blocking plate; 19, first cylinder; 20, second cylinder; 21, positioning plate; 22, switch 1; 23, control panel; 24. Extension plate; 25. Connecting rod; 26. Cross bar; 27. Bottom plate; 28. Gravity sensor; 29. ​​Switch 2; 30. Sliding slot; 31. Switch 3; 32. Third cylinder; 33. Connecting rod; 34. Connecting plate; 35. Connecting seat; 36. Rotating slot; 37. Mounting rod; 38. Mounting ring; 39. Abutment block; 40. Connecting block; 41. Switch 4; 42. Alarm; 43. Heating plate; 44. Motor; 45. Stirring rod; 46. Stirring blade. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0017] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] An injection molding machine that can reduce the defective rate, such as Figure 1-Figure 6 As shown, the machine comprises a frame 1 and a barrel 2 arranged on the frame 1, a feed hopper 3 is arranged at one end of the barrel 2, and a discharge port 4 is arranged at the other end, a feeding zone, a heating zone, and an injection zone are arranged in sequence from the feed hopper 3 to the discharge port 4 inside the barrel 2, a heating device and an injection device are respectively arranged in the heating zone and the injection zone, and the injection zone and the discharge port 4 are mutually conductive, and also comprises a box body 5 fixedly connected to the outer wall of the barrel 2, a screening zone located between the heating zone and the injection zone is arranged inside the barrel 2, one side of the box body 5 is mutually conductive with the screening zone through a connecting pipe 6, and the other side of the box body 5 is mutually conductive with the injection zone through a through groove 7, a first filter frame 8 is arranged in the screening zone, and a filter frame 8 is arranged on the inner wall of the connecting pipe 6. A second filter frame 9 is fixedly connected, a filter screen 10 is fixedly connected inside the first filter frame 8 and the second filter frame 9, two mounting seats 11 are rotatably connected at the bottom of the first filter frame 8, a first limit plate 12 and a second limit plate 13 are fixedly connected to the inner wall of the barrel 2, the bottoms of the two mounting seats 11 are connected to the first limit plate 12 and the second limit plate 13 through springs 14, the first limit plate 12 is located below the second limit plate 13, and the positions of the first limit plate 12 and the pipe mouth of the connecting pipe 6 correspond to each other, a cleaning port 15 connected to the screening area is opened on the outer wall of the barrel 2, a baffle 16 is detachably connected to the cleaning port 15, and the positions of the second limit plate 13 and the cleaning port 15 correspond to each other; Furthermore, the injection device includes a driving plate 17 slidably connected to the injection area, a baffle plate 18, and a first cylinder 19 and a second cylinder 20 fixedly connected to the outer wall of the barrel 2. The piston rod in the first cylinder 19 penetrates into the injection area and is fixedly connected to the driving plate 17. The piston rod in the second cylinder 20 penetrates into the injection area and is fixedly connected to the baffle plate 18. A positioning plate 21 corresponding to the position of the baffle plate 18 is fixedly connected in the injection area. The positioning plate 21 is provided with a positioning plate for controlling the operation of the first cylinder 19. Switch 1 22, when the blocking plate 18 and the switch 1 22 conflict with each other, the piston rod in the first cylinder 19 extends and the blocking plate 18 isolates the screening area from the injection area. A control panel 23 for controlling the operation of the second cylinder 20 is provided on the frame 1. A sensing component is provided in the injection area. When the injection area is filled with mixed material, the sensing component transmits a signal to the control panel 23 to drive the piston rod in the second cylinder 20 to extend. An extension plate 24 for blocking the through groove 7 is slidably connected in the box body 5, and the bottom end of the extension plate 24 is fixed The side wall of the baffle plate 18 is connected with a connecting rod 25, and a cross bar 26 is fixedly connected with the connecting rod 25 and the cross bar 26. The connecting rod 25 and the cross bar 26 are fixedly connected to each other. When the mixed material is injected into the injection area and the injection area is filled, the sensing component uses the control panel 23 to transmit a signal to drive the piston rod in the second cylinder 20 to extend, thereby driving the baffle plate 18 to move until the baffle plate 18 and the switch 22 on the positioning plate 21 conflict with each other. At this time, the baffle plate 18 isolates the screening area from the injection area and the baffle plate 18 drives the cross bar 26 and the connecting rod 25 to cooperate with each other. The extension plate 24 blocks the through slot 7. After the blocking plate 18 contacts the switch 1 22, the piston rod in the first cylinder 19 extends to drive the driving plate 17 to move. During the movement of the driving plate 17, the mixed material in the injection area is forced to flow toward the side of the discharge port 4, thereby completing the effect of injecting the mixed material in the injection area into the mold. When the injection is completed, the control panel 23 is used to drive the piston rods in the first cylinder 19 and the second cylinder 20 to retract, driving the driving plate 17, the blocking plate 18 and the extension plate 24 to move to their original positions. Furthermore, the sensing component includes a bottom plate 27 fixedly connected to the injection area, and a gravity sensor 28 connected to the control panel 23 is arranged on the bottom plate 27. When the weight of the mixed material in the injection area is greater than the preset value of the gravity sensor 28, the control panel 23 drives the piston rod in the second cylinder 20 to extend, and a switch 29 connected to the control panel 23 is arranged on the inner wall of the barrel 2 near the discharge port 4. When the driving plate 17 and the switch 29 conflict with each other, the control panel 23 drives the piston rods in the first cylinder 19 and the second cylinder 20 to extend. When the mixture in the injection area flows onto the bottom plate 27 and the weight is greater than the preset value of the gravity sensor 28, the gravity sensor 28 will transmit a signal to the control panel 23, thereby driving the piston rod in the second cylinder 20 to extend and drive the driving plate 17 to move. When the driving plate 17 moves to conflict with the switch 29, it means that the mixture in the injection area has been injected into the mold. The control panel 23 will drive the piston rods in the first cylinder 19 and the second cylinder 20 to retract in sequence, which is convenient for the next use. Furthermore, a sliding groove 30 is provided on the inner wall of the barrel 2, and the blocking plate 18 is slidably connected in the sliding groove 30, so as to prevent the blocking plate 18 from being displaced during the sliding process, and also improve the structural strength of the blocking plate 18; Furthermore, a switch 31 is provided on the top of the first limit plate 12, and a third cylinder 32 connected to the switch 31 is provided on the outer wall of the box body 5. The output end of the third cylinder 32 penetrates into the box body 5, and a connecting rod 33 is fixedly connected to the output end of the third cylinder 32. A connecting plate 34 is provided at one end of the connecting rod 33 away from the third cylinder 32. When the mounting seat 11 and the switch 31 conflict with each other, the output end of the third cylinder 32 retracts to drive the connecting plate 34 to separate from the connecting pipe 6. When the mixed material flows into the screening area, The agglomerated materials will be blocked by the filter screen 10 to prevent them from entering the injection area. At this time, the mixed materials will flow directly from the screening area to the injection area. When the agglomerated materials accumulate to the mounting seat 11 and the switch 31 conflict with each other, the third cylinder 32 retracts to separate the connecting plate 34 from the connecting pipe 6. At this time, the mixed materials in the screening area will flow into the box body 5 through the connecting pipe 6 and flow into the injection area along the through groove 7. The agglomerated materials are blocked by the first filter frame 8 and the filter screen 10 on the second filter to prevent them from affecting the quality of the product. Furthermore, a connecting plate 34 is fixedly connected to a connecting seat 35 on one side facing the connecting rod 33, a rotating groove 36 is provided on the connecting seat 35, a mounting rod 37 is fixedly connected in the rotating groove 36, a mounting ring 38 sleeved on the mounting rod 37 is fixedly connected to the connecting rod 33, a contact block 39 is fixedly connected to the top of the connecting rod 33, a connecting block 40 is fixedly connected to the bottom of the connecting rod 33, an alarm 42 is provided on the outer wall of the box body 5, a switch 41 connected to the alarm 42 is provided on the contact block 39, when the connecting plate 34 and the connecting tube 6 are in contact with each other, the connecting plate 34 and the switch 41 are in conflict with each other, and when the connecting plate 34 and the switch 41 are separated, the alarm 42 emits Alarm. When the connecting plate 34 is separated from the connecting pipe 6, the connecting plate 34 is in an inclined state and abuts against the connecting block 40. When the mounting seat 11 and the switch 31 collide with each other, the third cylinder 32 retracts to drive the connecting plate 34 to separate from the connecting pipe 6. At this time, since the connecting plate 34 and the connecting rod 33 are connected to each other through the connecting seat 35, the rotating groove 36, the mounting rod 37 and the mounting ring 38, under the influence of the gravity of the connecting plate 34, the connecting plate 34 will rotate and abut against the connecting block 40 and be in an inclined state. At this time, the connecting plate 34 is separated from the switch 41, and the alarm 42 sounds an alarm to remind the staff to clean up the excessive accumulation of agglomerated materials at the first filter frame 8 in time. Furthermore, the heating device includes a plurality of heating plates 43 arranged on the barrel 2 and a motor 44 fixedly connected to the outer wall of the barrel 2. The motor 44 and the heating plates 43 are both controlled by the control panel 23. The output end of the motor 44 is fixedly connected to a stirring rod 45 that penetrates into the interior of the barrel 2. A plurality of stirring blades 46 are fixedly connected to the outer wall of the stirring rod 45. The control panel 23 is used to drive the heating plates 43 to work to achieve heating treatment of the mixed material in the heating zone. At the same time, the control panel 23 is used to drive the motor 44 to drive the stirring rod 45 and the stirring blades 46 to rotate, thereby accelerating the mixing efficiency of the raw materials and auxiliary materials and reducing the agglomeration phenomenon.

[0020] The present invention is used as follows: The raw materials and auxiliary materials are put into the feed hopper 3 and fall into the inside of the barrel 2. After being heated and mixed by the heating device in the heating zone, they flow into the screening zone. When agglomeration occurs, the agglomerated materials will accumulate on the top of the filter screen 10 on the first filter frame 8. At this time, under the influence of the materials, the first filter frame 8 will force the spring 14 to contract and move downward. Since the first limit plate 12 is located below the second limit plate 13, the mounting seat 11 on the first filter frame 8 corresponding to the position of the second limit plate 13 will first contact the second limit plate 13. At the same time, since the mounting seat 11 is rotatably connected to the first filter frame 8, when the material accumulation amount increases, the first filter frame 8 will gradually tilt until the other mounting seat 11 is in contact with the second limit plate 13. The first limit plates 12 are in conflict with each other. At this time, under the action of the connecting pipe 6, the screening area and the box body 5 are connected to each other, and the mixed material will enter the box body 5 and flow to the injection area through the through groove 7. In this process, the filter screen 10 on the second filter frame 9 can further block the agglomerated material to prevent it from entering the box body 5. When the mixed material enters the injection area and fills the injection area, the injection device is used to inject the mixed material into the mold to complete the injection molding work, thereby preventing the agglomerated material from affecting the quality of the final product. After working for a period of time, the baffle 16 can be removed and the cleaning port 15 can be used to clean the agglomerated material on the first filter frame 8 to ensure the subsequent work.

[0021] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An injection molding machine capable of reducing the defective rate, comprising a frame (1) and a barrel (2) arranged on the frame (1), wherein one end of the barrel (2) is provided with a feed hopper (3), and the other end is provided with a discharge port (4), wherein the interior of the barrel (2) is provided with a feed zone, a heating zone, and an injection zone in sequence from the feed hopper (3) to the discharge port (4), wherein the heating zone and the injection zone are provided with a heating device and an injection device respectively, and the injection zone and the discharge port (4) are in electrical communication with each other, characterized in that: It also includes a box body (5) fixedly connected to the outer wall of the barrel (2), the barrel (2) is provided with a screening zone located between the heating zone and the injection zone, one side of the box body (5) is connected to the screening zone via a connecting pipe (6), and the other side of the box body (5) is connected to the injection zone via a through groove (7), a first filter frame (8) is provided in the screening zone, a second filter frame (9) is fixedly connected to the inner wall of the connecting pipe (6), a filter screen (10) is fixedly connected to the first filter frame (8) and the second filter frame (9), the bottom of the first filter frame (8) is rotatably connected to two mounting seats (11), and the A first limit plate (12) and a second limit plate (13) are fixedly connected to the inner wall of the barrel (2); the bottoms of the two mounting seats (11) are connected to the first limit plate (12) and the second limit plate (13) via springs (14); the first limit plate (12) is located below the second limit plate (13); and the positions of the first limit plate (12) and the pipe opening of the connecting pipe (6) correspond to each other; a cleaning port (15) communicating with the screening area is provided on the outer wall of the barrel (2); a baffle (16) is detachably connected to the cleaning port (15); and the positions of the second limit plate (13) and the cleaning port (15) correspond to each other.

2. An injection molding machine capable of reducing defective product rate according to claim 1, characterized in that: The injection device comprises a driving plate (17) and a blocking plate (18) which are slidably connected to the injection area, and a first cylinder (19) and a second cylinder (20) which are fixedly connected to the outer wall of the barrel (2). The piston rod in the first cylinder (19) penetrates into the injection area and is fixedly connected to the driving plate (17). The piston rod in the second cylinder (20) penetrates into the injection area and is fixedly connected to the blocking plate (18). A positioning plate (21) corresponding to the position of the blocking plate (18) is fixedly connected to the injection area. A switch (22) for controlling the operation of the first cylinder (19) is provided on the positioning plate (21). When the blocking plate (18) and the switch (22) conflict with each other, the first cylinder (19) is activated. The piston rod in the cylinder (19) is extended and at this time the baffle plate (18) isolates the screening area from the injection area. The frame (1) is provided with a control panel (23) for controlling the operation of the second cylinder (20). The injection area is provided with a sensing component. When the injection area is filled with mixed material, the sensing component transmits a signal to the control panel (23) to drive the piston rod in the second cylinder (20) to extend. An extension plate (24) for blocking the through groove (7) is slidably connected in the box body (5). A connecting rod (25) is fixedly connected to the bottom end of the extension plate (24). A cross bar (26) is fixedly connected to the side wall of the baffle plate (18). The connecting rod (25) and the cross bar (26) are fixedly connected to each other.

3. The injection molding machine capable of reducing defective product rate according to claim 2, characterized in that: The sensing component comprises a bottom plate (27) fixedly connected to the injection zone, and a gravity sensor (28) connected to the control panel (23) is arranged on the bottom plate (27). When the weight of the mixed material in the injection zone is greater than a preset value of the gravity sensor (28), the control panel (23) drives the piston rod in the second cylinder (20) to extend. A switch 2 (29) connected to the control panel (23) is arranged on the inner wall of the barrel (2) near the discharge port (4). When the driving plate (17) and the switch 2 (29) conflict with each other, the control panel (23) drives the piston rods in the first cylinder (19) and the second cylinder (20) to retract in sequence.

4. The injection molding machine capable of reducing defective product rate according to claim 3, characterized in that: A sliding groove (30) is provided on the inner wall of the barrel (2), and the blocking plate (18) is slidably connected in the sliding groove (30).

5. The injection molding machine capable of reducing defective product rate according to claim 2, characterized in that: A switch three (31) is arranged on the top of the first limit plate (12), and a third cylinder (32) connected to the switch three (31) is arranged on the outer wall of the box body (5). The output end of the third cylinder (32) penetrates into the box body (5), and a connecting rod (33) is fixedly connected to the output end of the third cylinder (32). A connecting plate (34) is arranged at one end of the connecting rod (33) away from the third cylinder (32). When the mounting seat (11) and the switch three (31) are in conflict with each other, the output end of the third cylinder (32) retracts to drive the connecting plate (34) to separate from the connecting pipe (6).

6. The injection molding machine capable of reducing defective product rate according to claim 5, characterized in that: A connecting seat (35) is fixedly connected to one side of the connecting plate (34) facing the connecting rod (33); a rotation groove (36) is formed on the connecting seat (35); a mounting rod (37) is fixedly connected to the rotating groove (36); a mounting ring (38) sleeved on the mounting rod (37) is fixedly connected to the connecting rod (33); an abutment block (39) is fixedly connected to the top of the connecting rod (33); a connecting block (40) is fixedly connected to the bottom of the connecting rod (33); and the box ( 5) is provided with an alarm (42) on the outer wall, and a switch four (41) connected to the alarm (42) is provided on the abutment block (39). When the connecting plate (34) and the connecting pipe (6) are in contact with each other, the connecting plate (34) and the switch four (41) abut against each other. When the connecting plate (34) and the switch four (41) are separated, the alarm (42) sounds an alarm. When the connecting plate (34) and the connecting pipe (6) are separated, the connecting plate (34) is in an inclined state and abuts against the connecting block (40).

7. The injection molding machine capable of reducing defective product rate according to claim 2, characterized in that: The heating device comprises a plurality of heating plates (43) arranged on the barrel (2) and a motor (44) fixedly connected to the outer wall of the barrel (2), wherein the motor (44) and the heating plates (43) are both controlled by a control panel (23), and an output end of the motor (44) is fixedly connected to a stirring rod (45) extending through the interior of the barrel (2), and a plurality of stirring blades (46) are fixedly connected to the outer wall of the stirring rod (45).

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