Pipette suction head injection molding device with finished product inspection function

Abstract

The pipettor suction head injection molding device with the finished product inspection function comprises an injection molding mechanism and a discharging mechanism, the injection molding mechanism comprises a multi-stage air cylinder connected with an upper mold, the upper mold comprises a first movable block and a second movable block, and a mold core penetrating through the second movable block is arranged at the bottom of the first movable block; elastic limiting pieces are arranged on the side surfaces of the second movable blocks; limiting openings are formed in the side surfaces of the first portal frames; the discharging mechanism comprises a material moving mechanism and a discharging conveying line, the discharging conveying line comprises a synchronous belt, a suction head positioning assembly is arranged on the synchronous belt, a first spring is connected between the bottom of a guide sleeve and a positioning needle, a supporting plate with a guide inclined plate on the side face is arranged in the support, and an opening capable of being opened and closed is formed in the supporting plate. A plurality of industrial cameras are arranged above the discharging conveying line, and an air blowing device and a defective product discharging channel are arranged on the two sides of the discharging conveying line correspondingly. Each pipettor suction head subjected to injection molding can be accurately positioned and detected, the detection efficiency is high, and the detection time is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of pipette tip injection molding devices, in particular to a pipette tip injection molding device with a finished product inspection function. Background Art

[0002] Pipette tips are important accessories for liquid washers, and are commonly made of polypropylene and polyethylene. They are generally made by injection molding, and the tips are required to have a smooth inner surface and accurate dimensions.

[0003] Pipette tips processed by injection molding may have the following defects: 1. Dimensional deviation: The inner or outer diameter does not meet the standard specifications. For example, if the inner diameter is too small, the connection between the pipette and the tip is not tight, affecting the sealing; if the outer diameter is too large, it may not fit the pipette. Length deviation may also exist, which will affect the depth of the pipette tip inserted into the pipette, thus affecting the accuracy of pipetting.

[0004] 2. Shape defects: The tip of the pipette may be bent or uneven. A bent tip can cause inaccurate positioning when aspirating small volumes of liquid, while an uneven tip can cause liquid residue or inaccurate aspiration. If the barrel of the pipette has depressions or protrusions, it will affect its fit with the pipette and the flow characteristics of the liquid in the pipette.

[0005] 3. Surface quality issues: The surface may be rough and bumpy. The rough inner surface will increase the friction between the liquid and the pipette tip, which may cause the liquid to stick to the wall, thus affecting the accuracy and repeatability of the pipetting. There are impurities. During the processing, impurities such as plastic debris may be mixed into the pipette tip, which will not only contaminate the sample, but also block the pipette tip, affecting the normal absorption and discharge of the liquid.

[0006] Therefore, before the injection-molded pipette tips are boxed and packaged, they need to be inspected as finished products. The existing inspection methods can generally only be carried out through manual screening or random inspection, which leads to the shipment of some unqualified pipette tips, making it difficult to ensure product quality, and even random inspections take a lot of time. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a pipette tip injection molding device with a finished product inspection function, which can accurately locate and inspect each pipette tip after injection molding, effectively avoiding the shipment of unqualified pipette tips, and has high inspection efficiency, saving inspection time.

[0008] In order to solve the above technical problems, the present invention is solved by the following technical solutions: a pipette tip injection molding device with a finished product inspection function, comprising an injection molding mechanism and a blanking mechanism, the injection molding mechanism comprising a first gantry, a lower mold is fixed at the bottom of the first gantry, an upper mold is vertically slidably arranged in the first gantry, a multi-stage cylinder for driving the upper mold to rise and fall is arranged on the top of the first gantry, the upper mold comprises a first movable block and a second movable block, a core that can movably pass through the second movable block is arranged at the bottom of the first movable block, the core cooperates with the cavity on the lower mold to form a mold cavity, an elastic limiter is arranged on the side of the second movable block, and a limited position opening is arranged on the side of the first gantry; the blanking mechanism comprises a material moving mechanism and a material moving conveyor line, the material moving mechanism comprises a linear slide rail, a slide table is arranged on the linear slide rail, a material moving platform with a transfer hole is arranged on the slide table, and an elastic sealing component is arranged at the bottom of the transfer hole The transfer platform moves between the bottom of the upper mold and the top of the unloading conveyor line, and a top plate is arranged near the side of the unloading conveyor line for hitting the elastic sealing component to open the bottom of the transfer hole; the unloading conveyor line includes a bracket, synchronous pulleys at both ends of the bracket and a synchronous belt wound on the synchronous pulley, and a suction head positioning assembly is arranged on the synchronous belt, and the suction head positioning assembly includes a guide sleeve and a positioning needle inserted in the guide sleeve, a first spring is connected between the bottom of the guide sleeve and the positioning needle, a support plate is arranged in the bracket, and a guide inclined plate is arranged on the support plate at the entrance side of the positioning needle, an opening is arranged on the support plate, and a movable plate driven by a driving device is arranged in the opening, and a plurality of industrial cameras aimed at the suction head above the opening are arranged above the unloading conveyor line, and a blowing device and a defective product discharge channel are respectively arranged on both sides of the opening of the unloading conveyor line.When using this pipette tip injection molding device with a finished product inspection function, a non-stick coating is first applied to the inner wall of the cavity, and then the multi-stage cylinder is fully extended, the upper mold and the lower mold are closed, and then injection molding is performed. After the tip is cooled and formed, the multi-stage cylinder is retracted one level, and the core drives the tip to rise together. At this time, the elastic limit piece just slides into the limit buckle, and the first movable block and the second movable block are not separated; then the linear slide rail drives the material transfer platform to slide under the upper mold, and the transfer holes on the material transfer platform are aligned with the core one by one, and then the multi-stage cylinder is retracted one level again. Due to the limitation of the limit mouth, the first movable block and the second movable block are separated at this time, and the second movable block moves downward relative to the first movable block to push the tip on the core down and drop it into the transfer hole, and then the linear slide rail drives the material transfer platform to slide above the unloading conveyor line. After the material transfer platform is moved away, the multi-stage cylinder is extended and closed. The mold is moved to the next round of injection molding operation. When the material transfer table moves to the top of the unloading conveyor line, the top plate pushes the elastic sealing component to open the transfer hole, and the transfer hole is aligned with the positioning pins on the synchronous belt one by one. The suction head in the transfer hole falls and is put on the positioning pin to stand upright. Then the synchronous belt rotates to drive the suction head to pass through the shooting positions of several industrial cameras one by one. After the industrial camera shoots and compares, if the suction head is defective, the driving device drives the movable plate to move to open the opening and then reset. After the opening is opened, the positioning pin retracts downward, and the defective suction head set thereon is blown to the defective product discharge channel by the blowing device. If the suction head has no defects, it continues to be driven by the synchronous belt to be transported to the discharge end. When it reaches the discharge end, the positioning pin loses the support of the support plate and moves downward under the elastic force of the first spring, so that the suction head can be discharged from the output end of the unloading conveyor line. Since this pipette tip injection molding device can be vertically positioned on the synchronous belt, the industrial camera can make accurate comparisons, and the industrial cameras at multiple different angles can be used to photograph and compare the dimensions of multiple angles. Each pipette tip that has been injected can be accurately positioned and inspected, effectively avoiding the shipment of unqualified pipette tips, and the inspection efficiency is high, saving inspection time.

[0009] In the above technical solution, preferably, the synchronous belt wheel is a roller with an annular notch in the middle to avoid the suction head positioning assembly. The use of this structure makes the synchronous belt wheel drive the synchronous belt to move more stably and can avoid the suction head positioning assembly.

[0010] In the above technical solution, preferably, the support plate is provided with a guide groove that abuts against the bottom of the positioning pin, and part of the guide groove is located on the movable plate. With this structure, the positioning pin can be stably and accurately arranged under the guidance of the guide groove, so that the positioning pin can accurately align with the center hole of the suction head dropped into the transfer hole.

[0011] In the above technical solution, preferably, support platforms are provided on both sides of the first gantry, the unloading conveyor line is located below the two support platforms, a plurality of industrial cameras are provided at the bottom of the support platform near the unloading side of the unloading conveyor line, the linear slide rails are provided in parallel on the support platforms, the slides are provided on the two linear slide rails, a fixing rod is connected between the two slides, and the material transfer platform is fixed on the fixing rod. The use of this structure makes the sliding of the material transfer platform more stable and accurate.

[0012] In the above technical solution, preferably, the bracket is provided with an adjusting bolt for vertical rotation, the adjusting bolt is threadedly connected to the support plate, and the top of the positioning pin is conical. Setting the top of the positioning pin into a cone shape is convenient for inserting the suction head, and the height of the support plate can be adjusted by rotating the adjusting bolt, thereby adjusting the length of the top of the positioning pin extending out of the guide sleeve, changing the outer diameter of the positioning pin where the positioning pin is flush with the guide sleeve, so as to adapt to the positioning of suction heads of various different apertures.

[0013] In the above technical solution, preferably, the unloading mechanism further includes a second gantry, on which a material ejection cylinder is provided, and the output end of the material ejection cylinder is connected to a material ejection rack, on which a ejection rod is provided that is aligned one by one with the transfer holes of the material transfer platform when the material unloading conveyor line is above the unloading conveyor line. With this structure, after the top plate pushes the elastic plugging assembly to open the transfer hole, the material ejection rack can be pushed downward by the material ejection cylinder, so that the suction head in the transfer hole can be correctly pushed to and sleeved on the positioning pin below it, avoiding the suction head remaining in the transfer hole.

[0014] In the above technical solution, preferably, a stopper is provided at the bottom of the core, and a receiving groove matching the stopper is provided at the bottom of the cavity, and the outer diameter of the stopper is greater than the inner diameter of the bottom of the cavity. When this structure is used, during injection molding, the stopper is located in the receiving groove and does not affect the injection molding. When the upper mold rises, the stopper can have a certain limiting effect on the bottom of the injection-molded suction head to prevent the suction head from failing to rise correctly with the core. When the first movable block is separated from the second movable block, since the suction head itself has a certain flexibility, it will not affect the blanking and size of the suction head. Of course, the outer diameter of the stopper should not be too large.

[0015] In the above technical solution, preferably, the elastic limiter comprises a guide cylinder fixed to the side of the second movable block, a limit block movably arranged in the guide cylinder, and a second spring located in the guide cylinder and connecting the bottom of the guide cylinder and the limit block, and a guide slope is arranged below the limit opening on the side of the first gantry, and the lower side of the outer end surface of the limit block matches the guide slope. With this structure, when the multi-stage cylinder moves downward, the limit block can automatically shrink into the guide cylinder under the guidance of the guide slope, so that the multi-stage cylinder can be extended and retracted more smoothly.

[0016] In the above technical solution, preferably, the elastic plugging component includes a sliding block movably arranged at the bottom of the material transfer platform, a guide rod passing through the sliding block and laterally fixed on the material transfer platform, a third spring is arranged between the sliding block and the material transfer platform, and a blanking hole matching the transfer hole is arranged on the sliding block, and when the material transfer platform moves to above the material unloading conveyor line, the top plate pushes against the sliding block to slide so that the blanking hole is aligned with the transfer hole. This elastic plugging component can conveniently cooperate with the top plate to open the transfer hole, has a simple structure, and is low in cost.

[0017] In the above technical solution, preferably, the movable plate is hinged to the support plate on the side of the opening, a support arm is fixed to the bottom of the support plate, and the driving device is a control cylinder with two ends hinged to the support arm and the bottom of the movable plate respectively. With this structure, the opening can be conveniently controlled by controlling the extension and contraction of the cylinder, thereby conveniently realizing the control of whether the positioning pin falls.

[0018] Compared with the prior art, the present invention has the following beneficial effects: when using the pipette tip injection molding device with the finished product inspection function, a non-stick coating is first applied to the inner wall of the cavity, and then the multi-stage cylinder is fully extended, the upper mold and the lower mold are closed, and then injection molding is performed. After the tip is cooled and formed, the multi-stage cylinder is retracted by one level, and the core drives the tip to rise together. At this time, the elastic limit piece just slides into the limit buckle, and the first movable block and the second movable block are not separated; then the linear slide rail drives the material moving platform to slide under the upper mold, and the transfer hole on the material moving platform is aligned with the core one by one, and then the multi-stage cylinder is retracted by one level again. Due to the limiting position of the limiting mouth, the first movable block and the second movable block are separated at this time, and the second movable block moves downward relative to the first movable block to push the tip sleeved on the core down and fall into the transfer hole, and then the linear slide rail drives the material moving platform to slide above the unloading conveyor line, and the material moving platform is moved away Afterwards, the multi-stage cylinder extends out to close the mold and continues the next round of injection molding operation. When the material transfer table moves to the top of the unloading conveyor line, the top plate pushes the elastic sealing component to open the transfer hole, and the transfer hole is aligned with the positioning pins on the synchronous belt one by one. The suction head in the transfer hole falls down and is put on the positioning pin to stand upright. Then the synchronous belt rotates to drive the suction head to pass through the shooting positions of several industrial cameras one by one. After the industrial camera shoots and compares, if the suction head is defective, the driving device drives the movable plate to move to open the opening and then reset it. After opening the opening, the positioning pin retracts downward, and the defective suction head mounted thereon is blown to the defective product discharge channel by the blowing device. If the suction head has no defects, it continues to be driven by the synchronous belt to be transported to the discharge end. When reaching the discharge end, the positioning pin moves downward under the elastic force of the first spring due to the loss of support from the support plate, so that the suction head can be discharged from the output end of the unloading conveyor line. Since this pipette tip injection molding device can be vertically positioned on the synchronous belt, the industrial camera can make accurate comparisons, and the industrial cameras at multiple different angles can be used to photograph and compare the dimensions of multiple angles. Each pipette tip that has been injected can be accurately positioned and inspected, effectively avoiding the shipment of unqualified pipette tips, and the inspection efficiency is high, saving inspection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the local structure of an embodiment of the present invention.

[0021] Figure 3 It is a schematic cross-sectional structure diagram of the injection molding mechanism during mold closing in an embodiment of the present invention.

[0022] Figure 4 for Figure 3 A partial enlarged view of .

[0023] Figure 5It is a schematic cross-sectional structural diagram of the injection molding mechanism during mold opening in an embodiment of the present invention.

[0024] Figure 6 It is a schematic diagram of the exploded structure of the unloading conveyor line in an embodiment of the present invention.

[0025] Figure 7 for Figure 6 A partial enlarged view of .

[0026] Figure 8 It is a schematic diagram of the partial cross-sectional structure when positioning the suction head of the unloading conveyor line in an embodiment of the present invention.

[0027] Fig. 9 It is a schematic diagram of the partial cross-sectional structure when the suction head positioning is released for the unloading conveying line in an embodiment of the present invention.

[0028] Fig.10 It is a schematic diagram of the cross-sectional structure of the material transfer platform in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 10A pipette tip injection molding device with a finished product inspection function includes an injection molding mechanism and a feeding mechanism. The injection molding mechanism includes a first gantry 1, a lower mold 2 is fixed at the bottom of the first gantry 1, an upper mold 3 is vertically slidably arranged in the first gantry 1, a multi-stage cylinder 4 for driving the upper mold 3 to rise and fall is arranged at the top of the first gantry 1, the upper mold 3 includes a first movable block 5 and a second movable block 6, a core 7 that can move through the second movable block 6 is arranged at the bottom of the first movable block 5, the core 7 cooperates with the cavity on the lower mold 2 to form a mold cavity, and an elastic A limit piece 8 is provided, and a limit opening 9 is provided on the side of the first gantry 1; the unloading mechanism includes a material moving mechanism and an unloading conveying line, the material moving mechanism includes a linear slide rail 10, a slide table 11 is provided on the linear slide rail 10, a material moving platform 13 with a transfer hole 12 is provided on the slide table 11, an elastic plugging component 14 is provided at the bottom of the transfer hole 12, the material moving platform 13 moves between the bottom of the upper mold 3 and the top of the unloading conveying line, and a top plate 15 for hitting the elastic plugging component 14 to open the bottom of the transfer hole 12 is provided near the unloading conveying line side; the unloading conveying line includes a bracket 16, located at the bracket 16 The synchronous pulleys 17 at both ends and the synchronous belt 18 wound around the synchronous pulleys 17, one of the synchronous pulleys 17 is connected to a servo drive motor, and the servo drive motor can drive the synchronous pulley 17 to intermittently rotate at a specific angle. The synchronous belt 18 is provided with a suction head positioning assembly 19, and the suction head positioning assembly 19 includes a guide sleeve 20 and a positioning needle 21 inserted in the guide sleeve 20. The guide sleeve 20 includes two parts, which are clamped and fixed on the synchronous belt 18 from both sides by threaded connection. A first spring 22 is connected between the bottom of the guide sleeve 20 and the positioning needle 21. A support plate 23 is provided in the bracket 16 and abuts against the bottom of the positioning needle 21. A guide inclined plate 24 is provided on the support plate 23 at the entrance side of the positioning needle 21. An opening 25 is provided on the support plate 23. A movable plate 26 driven by a driving device is provided in the opening 25. A plurality of industrial cameras 27 aimed at the suction head above the opening 25 are provided above the unloading conveyor line. A blowing device 28 and a defective product discharge channel 29 are respectively provided on both sides of the opening 25 of the unloading conveyor line. The blowing device 28 is an air pump connected to the blowing port, and the blowing direction of the blowing port is aligned with the defective product discharge channel 29.When this pipette tip injection molding device with finished product inspection function is in use, a non-stick coating is first applied to the inner wall of the cavity, and then the multi-stage cylinder 4 is fully extended, the upper mold 3 and the lower mold 2 are molded together, and then injection molding is performed. After the tip is cooled and formed, the multi-stage cylinder 4 is retracted one level, and the core 7 drives the tip to rise together. At this time, the elastic limit member 8 just slides into the limit buckle, and the first movable block 5 and the second movable block 6 are not separated; then the linear slide 10 drives the material moving platform 13 to slide under the upper mold 3, and the transfer hole 12 on the material moving platform 13 is aligned with the core 7 one by one. Then the multi-stage cylinder 4 is retracted one level again. Due to the limiting position of the limiting opening 9, the first movable block 5 and the second movable block 6 are separated at this time, and the second movable block 6 moves downward relative to the first movable block 5 to push the tip on the core 7 down and fall into the transfer hole 12, and then the linear slide 10 drives the material moving platform 13 to slide above the unloading conveyor line. After the material moving platform 13 is moved away, the multi-stage cylinder 4 extends out to close the mold, and continues to be molded. The next round of injection molding operation is carried out. When the material transfer platform 13 moves to the top of the unloading conveyor line, the top plate 15 pushes the elastic blocking component 14 to open the transfer hole 12, and the transfer hole 12 is aligned with the positioning pin 21 on the synchronous belt 18 one by one. The suction head in the transfer hole 12 falls and is sleeved on the positioning pin 21 to stand upright. Then, the synchronous belt 18 rotates and drives the suction head to pass through the shooting positions of several industrial cameras 27 one by one. After the industrial camera 27 shoots and compares, if the suction head is defective, the driving device drives the movable plate 26 to move to open the opening 25 and then reset. After opening the opening 25, the positioning pin 21 retracts downward, and the defective suction head sleeved thereon is blown to the defective discharge channel 29 by the blowing device 28. If the suction head has no defects, it continues to be driven by the synchronous belt 18 to be transported to the discharge end. When reaching the discharge end, the positioning pin 21 moves downward under the elastic force of the first spring 22 due to the loss of support of the support plate 23, so that the suction head can be discharged from the output end of the unloading conveyor line. Since this pipette tip injection molding device can be vertically positioned on the synchronous belt 18, the industrial camera 27 can be accurately compared, and the industrial cameras 27 at multiple different angles can be used to photograph and compare the dimensions of multiple angles. Each pipette tip that has been injected can be accurately positioned and inspected, effectively avoiding the shipment of unqualified pipette tips, and the inspection efficiency is high, saving inspection time.

[0030] The image processing steps of the industrial camera 27 may be as follows: S1: pre-collect the defect-free tips of the finished product and position them on the positioning pin 21, take their images and collect and store their images; S2: set a similarity threshold; S3: compare the collected image with the image of the defect-free tip for similarity. If it is greater than the threshold, it is a defect-free finished product. If it is less than the threshold, it is a defective defective product.

[0031] If the defective products are detected, the driving device drives the movable plate 26 to move to open the opening 25 and then reset it. The blowing device 28 blows air, and the air flow blown by the blowing device 28 blows the defective products into the defective product discharge channel 29 for sorting, thereby realizing the automatic inspection and sorting functions.

[0032] In this embodiment, the synchronous pulley 17 is in the shape of a roller with an annular notch in the middle for avoiding the suction head positioning assembly 19. This structure makes the synchronous pulley 17 drive the synchronous belt 18 to move more stably and avoid the suction head positioning assembly 19. In order to simplify the drawing, the synchronous teeth are not drawn on the synchronous pulley 17 and the synchronous belt 18 in the accompanying drawing 6, but in order to make it accurate, they should actually have synchronous teeth.

[0033] In this embodiment, the support plate 23 is provided with a guide groove 30 that abuts against the bottom of the positioning pin 21, and part of the guide groove 30 is located on the movable plate 26. This structure allows the positioning pin 21 to be stably and accurately arranged under the guidance of the guide groove 30, preventing the positioning pin 21 from deflecting left and right and failing to accurately align with the center hole of the suction head. Even if there is a small amount of deflection in the front-to-back direction, the deflection direction of these positioning pins 21 is consistent, and the distance between the needle tips of adjacent positioning pins 21 remains unchanged. By adjusting the position where the synchronous belt 17 stops rotating, it can be ensured that the needle tip of the positioning pin 21 can accurately align with the center hole of the suction head dropped into the transfer hole 12.

[0034] In this embodiment, support platforms 31 are provided on both sides of the first gantry 1, and the support platforms 31 are supported by support rods. The unloading conveyor line is located below the two support platforms 31, and a plurality of industrial cameras 27 are provided at the bottom of the support platform 31 near the unloading side of the unloading conveyor line. Linear slide rails 10 are provided in parallel on the support platforms 31, and slides 11 are provided on the two linear slide rails 10. A fixed rod 32 is connected between the two slides 11, and a material transfer platform 13 is fixed on the fixed rod 32. The use of this structure makes the sliding of the material transfer platform 13 more stable and accurate.

[0035] In this embodiment, the bracket 16 is provided with an adjusting bolt 33 for vertical rotation, the adjusting bolt 33 is threadedly connected to the support plate 23, and the top of the positioning pin 21 is conical. The top of the positioning pin 21 is set to be conical, which is convenient for inserting the suction head, and the height of the support plate 23 can be adjusted by rotating the adjusting bolt 33, so as to adjust the length of the top of the positioning pin 21 extending out of the guide sleeve 20, and change the outer diameter of the positioning pin 21 where the positioning pin 21 is flush with the guide sleeve 20 to adapt to the positioning of suction heads of various different apertures.

[0036] In this embodiment, the unloading mechanism also includes a second gantry 34, the two columns of the second gantry 34 are fixed on the support platform 31, and a vertically retractable ejection cylinder 35 is provided on the second gantry 34. The output end of the ejection cylinder 35 is connected to an ejection rack 36, and an ejection rack 36 is provided with an ejector rod 37 that is aligned one by one with the transfer hole 12 of the material transfer platform 13 when it is above the unloading conveyor line. With this structure, after the top plate 15 pushes the elastic blocking component 14 to open the transfer hole 12, the ejection rack 36 can be pushed downward by the ejection cylinder 35, so that the suction head in the transfer hole 12 can be correctly pushed to and sleeved on the positioning pin 21 below it, avoiding the suction head remaining in the transfer hole 12.

[0037] In this embodiment, a stopper 38 is provided at the bottom of the core 7, and a receiving groove 39 matching the stopper 38 is provided at the bottom of the cavity, and the outer diameter of the stopper 38 is greater than the inner diameter of the bottom of the cavity. When this structure is used, during injection molding, the stopper 38 is located in the receiving groove 39, which does not affect the injection molding. When the upper mold rises, the stopper 38 can have a certain limiting effect on the bottom of the injection-molded suction head to prevent the suction head from being unable to rise correctly with the core 7. When the first movable block 5 and the second movable block 6 are separated, since the suction head itself has a certain flexibility, it will not affect the blanking and size of the suction head. Of course, the outer diameter of the stopper 38 should not be too large, and it can provide sufficient support or friction to drive the suction head to rise, and when the suction head is pushed downward, the suction head itself can be deformed to smoothly pass over the stopper 38.

[0038] In this embodiment, the elastic stopper 8 includes a guide cylinder 40 fixed to the side of the second movable block 6, a stopper 41 movably arranged in the guide cylinder 40, and a second spring 42 located in the guide cylinder 40 and connecting the bottom of the guide cylinder 40 and the stopper 41. A guide slope 43 is arranged below the stopper opening 9 on the side of the first gantry 1, and the lower side of the outer end surface of the stopper 41 matches the guide slope 43. With this structure, when the multi-stage cylinder 4 moves downward, the stopper 41 can automatically shrink into the guide cylinder 40 under the guidance of the guide slope 43, so that the multi-stage cylinder 4 can be extended and retracted more smoothly.

[0039] In this embodiment, the elastic plugging assembly 14 includes a sliding block 44 movably arranged at the bottom of the material moving platform 13, a guide rod 45 passing through the sliding block 44 and laterally fixed on the material moving platform 13, a third spring 46 is arranged between the sliding block 44 and the material moving platform 13, and a blanking hole 47 matching the transfer hole 12 is arranged on the sliding block 44. When the material moving platform 13 moves to above the material unloading conveyor line, the top plate 15 pushes against the sliding block 44 to slide so that the blanking hole 47 is aligned with the transfer hole 12. This elastic plugging assembly 14 can conveniently cooperate with the top plate 15 to open the transfer hole 12, has a simple structure, and is low in cost.

[0040] In this embodiment, the movable plate 26 is hinged on the support plate 23 on the side of the opening 25, a support arm 48 is fixed at the bottom of the support plate 23, and the driving device is a control cylinder 49 whose two ends are respectively hinged to the support arm 48 and the bottom of the movable plate 26. With this structure, the opening or closing of the opening 25 can be conveniently controlled by the extension and contraction of the control cylinder 49, thereby conveniently realizing the control of whether the positioning pin 21 falls. Of course, in other embodiments, the movable plate 26 can also open the opening 25 in a translation or lifting manner.

[0041] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A pipette tip injection molding device with a finished product inspection function, comprising an injection molding mechanism and a feeding mechanism, characterized in that: The injection molding mechanism comprises a first gantry (1), a lower mold (2) is fixed at the bottom of the first gantry (1), an upper mold (3) is vertically slidably arranged inside the first gantry (1), a multi-stage cylinder (4) is arranged at the top of the first gantry (1) for driving the upper mold (3) to move up and down, the upper mold (3) comprises a first movable block (5) and a second movable block (6), a core (7) is arranged at the bottom of the first movable block (5) and is movable through the second movable block (6), the core (7) cooperates with the mold cavity on the lower mold (2) to form a mold cavity, and the second movable block (6) An elastic limiter (8) is arranged on the side, and a limit opening (9) is arranged on the side of the first gantry (1); the unloading mechanism comprises a material transfer mechanism and an unloading conveying line, the material transfer mechanism comprises a linear slide rail (10), a slide table (11) is arranged on the linear slide rail (10), a material transfer platform (13) having a transfer hole (12) is arranged on the slide table (11), an elastic blocking component (14) is arranged at the bottom of the transfer hole (12), the material transfer platform (13) moves between below the upper mold (3) and above the unloading conveying line, and a material transfer mechanism (14) for impacting the material transfer platform (13) is arranged near the unloading conveying line. The elastic blocking component (14) opens the top plate (15) at the bottom of the transfer hole (12); the unloading conveyor line comprises a bracket (16), synchronous pulleys (17) located at both ends of the bracket (16) and a synchronous belt (18) wound around the synchronous pulley (17); a suction head positioning component (19) is arranged on the synchronous belt (18); the suction head positioning component (19) comprises a guide sleeve (20) and a positioning needle (21) inserted into the guide sleeve (20); a first spring (22) is connected between the bottom of the guide sleeve (20) and the positioning needle (21); the bracket A support plate (23) is arranged inside (16) and abuts against the bottom of the positioning needle (21); a guide inclined plate (24) is arranged on the support plate (23) at the entrance side of the positioning needle (21); an opening (25) is arranged on the support plate (23); a movable plate (26) driven by a driving device is arranged in the opening (25); a plurality of industrial cameras (27) are arranged above the unloading conveyor line and are aimed at the suction head above the opening (25); and a blowing device (28) and a defective product discharge channel (29) are respectively arranged on both sides of the opening (25) of the unloading conveyor line.

2. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: The synchronous belt wheel (17) is in the shape of a roller and has an annular notch in the middle for avoiding the suction head positioning assembly (19).

3. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1 or 2, characterized in that: The support plate (23) is provided with a guide groove (30) abutting against the bottom of the positioning pin (21), and part of the guide groove (30) is located on the movable plate (26).

4. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: Support platforms (31) are provided on both sides of the first gantry (1), the unloading conveyor line is located below the two support platforms (31), and a plurality of industrial cameras (27) are provided at the bottom of the support platform (31) near the discharge side of the unloading conveyor line. The linear slide rails (10) are respectively provided in parallel on the support platform (31), and the slides (11) are provided on the two linear slide rails (10). A fixing rod (32) is connected between the two slides (11), and the material transfer platform (13) is fixed on the fixing rod (32).

5. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: An adjusting bolt (33) is vertically rotatably provided on the bracket (16), the adjusting bolt (33) being threadedly connected to the support plate (23), and the top of the positioning pin (21) is conical.

6. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: The unloading mechanism further comprises a second gantry (34), on which a material ejecting cylinder (35) is arranged, the output end of the material ejecting cylinder (35) is connected to a material ejecting frame (36), and the material ejecting frame (36) is provided with an ejector rod (37) which is aligned one by one with the transfer holes (12) of the material transfer platform (13) when the material unloading conveyor line is above the material unloading conveyor line.

7. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: A stopper (38) is provided at the bottom of the core (7), and a receiving groove (39) matching the stopper (38) is provided at the bottom of the cavity. The outer diameter of the stopper (38) is greater than the inner diameter of the bottom of the cavity.

8. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: The elastic limiting member (8) comprises a guide cylinder (40) fixed to the side of the second movable block (6), a limiting block (41) movably arranged in the guide cylinder (40), and a second spring (42) located in the guide cylinder (40) and connecting the bottom of the guide cylinder (40) and the limiting block (41). A guiding inclined surface (43) is arranged below the limiting opening (9) on the side of the first gantry (1), and the lower side of the outer end surface of the limiting block (41) matches the guiding inclined surface (43).

9. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: The elastic blocking assembly (14) includes a sliding block (44) movably arranged at the bottom of the material transfer platform (13), a guide rod (45) passing through the sliding block (44) and laterally fixed to the material transfer platform (13), a third spring (46) is arranged between the sliding block (44) and the material transfer platform (13), and a blanking hole (47) matching the transfer hole (12) is arranged on the sliding block (44). When the material transfer platform (13) moves to above the material discharge conveyor line, the top plate (15) presses against the sliding block (44) to slide so that the blanking hole (47) is aligned with the transfer hole (12).

10. A pipette tip injection molding device with a finished product inspection function as claimed in claim 1, characterized in that: The movable plate (26) is hinged to the support plate (23) on the side of the opening (25), a support arm (48) is fixed to the bottom of the support plate (23), and the driving device is a control cylinder (49) with two ends respectively hinged to the support arm (48) and the bottom of the movable plate (26).

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