Injector with buffering and positioning functions in injection blow molding machine

Abstract

The utility model discloses an injector with buffering and positioning functions in an injection blow molding machine, which comprises an injector body, an injection seat stand arranged on the injector body, a fixing plate arranged on the injection seat stand, a plurality of pull rod shafts arranged in the fixing plate in a sliding manner, and fixed on the same pushing plate. The pull rod shaft is sleeved with a heavy-load spring, the two ends of the heavy-load spring abut against the fixing plate and the pushing plate respectively, a proximity switch is arranged on the fixing plate, an induction rod extending to the proximity switch is arranged on the pushing plate, the pushing plate is sleeved with a lead screw nut, and a lead screw is in threaded connection with the interior of the lead screw nut. One end of the lead screw is rotationally arranged in one supporting seat and then is connected with the gear motor, and the other end of the lead screw sequentially penetrates through the fixing plate and the injection seat stand and then is rotationally connected with the other supporting seat. According to the utility model, the buffer effect can be achieved through the heavy-load spring, so that the injector body is protected.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and more particularly to an injection syringe with buffer positioning in an injection molding machine. Background Technology

[0002] In an injection blow molding machine, the syringe heats and melts the plastic raw material, mixing it to form a molten state. This molten material is then delivered to the nozzle and injected into the mold cavity to create the desired shape. During injection, the syringe needs to be moved towards the mold to connect the nozzle to the mold. Currently, most injection units connect the injection station to the output end of a hydraulic cylinder. The hydraulic cylinder drives the syringe to move forward and backward. Figure 1 As shown, the hydraulic cylinder drives the syringe forward and backward at high speeds, producing loud noise and being uncontrollable. This results in a large impact force between the syringe nozzle and the mold. Since the buffer force offsets the impact force, the nozzle and mold are easily damaged. Furthermore, during injection, because the mold is in a sealed state, the syringe is subjected to a recoil force, which acts directly on the hydraulic cylinder. After prolonged exposure to this recoil force, the hydraulic cylinder is prone to accelerated wear of internal seals, leading to internal pressure leakage and oil leakage in the oil circuit. This affects the pushing accuracy of the syringe, preventing a good sealing contact between the syringe and the mold, and ultimately affecting the injection molding quality of the product. Utility Model Content

[0003] The purpose of this invention is to provide a syringe with buffer positioning in an injection blower that can solve the above-mentioned problems.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a syringe with buffer positioning in an injection blow molding machine, comprising: a syringe body, an injection seat on the syringe body, a fixed plate on the injection seat, a plurality of pull rod shafts slidably disposed in the fixed plate, all pull rod shafts being fixedly disposed on the same push plate, a heavy-duty spring being fitted on the pull rod shaft, the two ends of the heavy-duty spring abutting against the fixed plate and the push plate respectively, a proximity switch being disposed on the fixed plate, a sensing rod extending toward the proximity switch being disposed on the push plate, a lead screw nut being fitted on the push plate, a lead screw being threadedly connected in the lead screw nut, one end of the lead screw being rotatably disposed in a support base and connected to a reduction motor, and the other end of the lead screw passing through the fixed plate and the injection seat in sequence and being rotatably connected to another support base.

[0005] Furthermore, the aforementioned injection blow machine has a buffer positioning syringe, wherein the left and right width of the fixed plate is greater than the left and right width of the injection stage, and two pull rod shafts are slidably arranged on the left and right sides of the fixed plate, respectively. The two pull rod shafts on the left and the two pull rod shafts on the right are symmetrically arranged and do not interfere with the injection stage.

[0006] Furthermore, the aforementioned injection blower has a buffer positioning syringe, wherein two proximity switches are respectively installed on the left and right side walls of the fixed plate, and the four proximity switches correspond to the four pull rod shafts respectively. Two sensing rods are respectively installed on the left and right side walls of the push plate, and the four sensing rods are respectively matched with the four proximity switches.

[0007] Furthermore, the aforementioned injection blower has a buffer-positioning syringe, wherein when the heavy-duty spring is in an uncompressed state, there is a gap between the sensing rod and the proximity switch, and the gap between the four sensing rods and the four corresponding proximity switches is the same.

[0008] Furthermore, the aforementioned injection blower includes a syringe with buffer positioning. The connection structure between the pull rod shaft, the fixed plate, and the push plate is as follows: one end of the pull rod shaft abuts against the push plate, a bolt passes through the push plate, and the bolt is threadedly connected to the end of the pull rod shaft. A through hole is provided on the fixed plate, and an oil-free bearing is provided in the through hole. The other end of the pull rod shaft is slidably disposed in the oil-free bearing. A limit screw is threadedly connected to the end of the pull rod shaft connected to the oil-free bearing, and a limit ring is fitted on the limit screw.

[0009] The advantages of this invention are as follows: The geared motor combined with the lead screw transmission structure results in low noise and precise, uniform control of the syringe body's forward and backward stroke. The impact force generated when the syringe body contacts the mold is transmitted to the heavy-duty spring, which buffers and neutralizes the impact force, thus preventing damage to the syringe body and mold. After the syringe body rests against the mold, the push plate continues to push and compress the heavy-duty spring, so that the compressed spring is in an energy storage state and applies a pushing force to the syringe body, allowing the syringe body to stably rest against the mold and buffering and neutralizing the recoil force during injection. Cooperative sensing rods and proximity switches are respectively installed on the push plate and the fixed plate to control the compression of the heavy-duty spring. This prevents insufficient compression of the heavy-duty spring from causing insufficient pushing force on the syringe body, resulting in unstable contact between the syringe body and the mold, and also prevents over-compression of the heavy-duty spring from failing to buffer and neutralize the recoil force during injection. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a hydraulically driven syringe in an existing injection blower.

[0011] Figure 2 This is a schematic diagram of the syringe with buffer positioning in the injection blowing machine described in this utility model.

[0012] Figure 3 yes Figure 2 A magnified schematic diagram of the structure in the A direction.

[0013] Figure 4 yes Figure 2 A schematic diagram of the positional structure between the injection stage and the fixing plate. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0015] like Figures 2-4 As shown, the syringe with buffer positioning in the injection blow molding machine of this utility model includes: a syringe body 1, an injection seat 11 disposed on the syringe body 1, a fixing plate 2 disposed on the injection seat 11, the left and right width of the fixing plate 2 being greater than the left and right width of the injection seat 11, and two pull rod shafts 21 slidably disposed on the left and right sides of the fixing plate 2 respectively, the two pull rod shafts 21 on the left side and the two pull rod shafts 21 on the right side being symmetrically disposed and not interfering with the injection seat 11, and the pull rod shafts 21 being positioned relative to the fixing plate 2. The connection structure is as follows: a through hole is provided on the fixed plate 2, and an oilless bearing 22 is provided in the through hole. One end of the pull rod shaft 21 is slidably disposed in the oilless bearing 22. A limit screw 23 is threadedly connected to the end of the pull rod shaft 21 connected to the oilless bearing 22. A limit ring 24 is fitted on the limit screw 23. All four pull rod shafts 21 are fixedly disposed on the same push plate 3. The connection structure between the pull rod shaft 21 and the push plate 3 is as follows: the other end of the pull rod shaft 21 abuts against the push plate 3, and a threaded rod shaft 24 passes through the push plate 3. There is a bolt 31, which is threaded to one end of the pull rod shaft 21 that abuts against the push plate 3. A heavy-duty spring 4 is fitted on the pull rod shaft 21, with its two ends abutting against the fixed plate 2 and the push plate 3 respectively. Two proximity switches 5 are respectively installed on the left and right side walls of the fixed plate 2, and the four proximity switches 5 correspond to the four pull rod shafts 21 respectively. Two sensing rods 51 are respectively installed on the left and right side walls of the push plate 3, and the four sensing rods 51 are respectively matched with the four proximity switches 5. When the heavy-duty spring 4 is in position... When not compressed, there is a gap between the sensing rod 51 and the corresponding proximity switch 5. The gap between the four sensing rods 51 and the four corresponding proximity switches 5 is the same. This gap is the rated compression of the heavy-duty spring 4. A lead screw nut 61 is fitted on the push plate 3. A lead screw 6 is threaded into the lead screw nut 61. One end of the lead screw 6 is rotatably set in the support seat 62 and then connected to the reduction motor 7. The other end of the lead screw 6 passes through the fixed plate 2 and the injection seat 11 in sequence and is rotatably connected to another support seat 62.

[0016] In operation, the geared motor 7 drives the lead screw 6 to rotate. The lead screw 6, through threaded transmission, drives the lead screw nut 61 and the push plate 3 to move towards the mold. During this movement, the push plate 3 pushes the fixed plate 2, injection seat 11, and syringe body 1 towards the mold via the heavy-duty spring 4. Since the heavy-duty spring 4 requires a large load to compress and deform, and the load generated by the push plate 3 pushing the fixed plate 2, injection seat 11, and syringe body 1 via the heavy-duty spring 4 is insufficient to cause significant compression deformation, the push plate 3 can still push the syringe body 1 via the heavy-duty spring 4. When the syringe body 1 abuts against the mold, the impact force between the mold and the nozzle on the syringe body 1 is transmitted to the heavy-duty spring 4. The heavy-duty spring 4 acts as a buffer, thus offsetting the impact force between the nozzle and the mold. To protect the nozzle and mold from damage, the geared motor 7 continues to drive the lead screw 6 to rotate. The lead screw nut 61 drives the push plate 3 to continue moving, while the fixed plate 2, injection seat 11, and syringe body 1 remain stationary due to the resistance of the mold. The push plate 3 continues to move, pushing the pull rod shaft 21 and compressing the heavy-duty spring 4. The pull rod shaft 21 slides outward from the fixed plate 2, and the heavy-duty spring 4 is gradually compressed. After being compressed, the heavy-duty spring 4 is in an energy storage state and applies pressure to the syringe body 1. When the sensing rod 51 on the push plate 3 is sensed by the corresponding proximity switch 5, the heavy-duty spring 4 is compressed to the rated compression amount. This rated compression amount can enable the heavy-duty spring 4 to apply a pushing force to the syringe body 1 through its elasticity, so that the syringe body 1 can stably rest against the mold. It can also provide a compression margin for the heavy-duty spring 4 to buffer the syringe body 1 when it is subjected to recoil force during injection. After injection is completed, the reduction motor 7 drives the lead screw 6 to reverse, and the lead screw 6 drives the push plate 3 to move in the opposite direction. When the push plate 3 moves in the opposite direction, it gradually releases the heavy-duty spring 4 and pulls the pull rod shaft 21. When the limit ring 24 on the pull rod shaft 21 abuts against the fixed plate 2, the fixed plate 2, the injection stage 11 and the syringe body 1 will move in the opposite direction away from the mold under the pull of the push plate 3.

[0017] Since each pull rod shaft 21 and the heavy-duty spring 4 mounted on the pull rod shaft 21 correspond to a proximity switch 5 and a sensing rod 51, and the distance between the four proximity switches 5 and the four corresponding sensing rods 51 is the same, when the four heavy-duty springs 4 are compressed, the four proximity switches 5 simultaneously sense their respective sensing rods 51. When there is a time difference when the four proximity switches 5 sense their respective sensing rods 51, it indicates that a heavy-duty spring 4 has failed, which requires stopping the machine and replacing the four heavy-duty springs 4.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A syringe with buffer positioning in an injection blower, comprising: The syringe body has an injection seat, characterized in that: a fixed plate is provided on the injection seat, and a plurality of pull rod shafts are slidably arranged in the fixed plate. The pull rod shafts are all fixedly arranged on the same push plate. A heavy-duty spring is fitted on the pull rod shaft, and the two ends of the heavy-duty spring abut against the fixed plate and the push plate respectively. A proximity switch is provided on the fixed plate, and a sensing rod extending to the proximity switch is provided on the push plate. A lead screw nut is fitted on the push plate, and a lead screw is threadedly connected to the lead screw nut. One end of the lead screw is rotatably arranged in a support seat and connected to a reduction motor. The other end of the lead screw passes through the fixed plate and the injection seat in sequence and is rotatably connected to another support seat.

2. The syringe with buffer positioning in the injection machine according to claim 1, characterized in that: The width of the fixed plate is greater than the width of the injection stage. Two tie rods are slidably installed on the left and right sides of the fixed plate, respectively. The two tie rods on the left and the two tie rods on the right are symmetrically arranged and do not interfere with the injection stage.

3. The syringe with buffer positioning in the injection machine according to claim 2, characterized in that: Two proximity switches are installed on the left and right side walls of the fixed plate, and the four proximity switches correspond to the four pull rod shafts respectively. Two sensing rods are installed on the left and right side walls of the push plate, and the four sensing rods are matched with the four proximity switches respectively.

4. The syringe with buffer positioning in the injection machine according to claim 3, characterized in that: When the heavy-duty spring is in an uncompressed state, there is a gap between the sensing rod and the proximity switch, and the gap between the four sensing rods and the four corresponding proximity switches is the same.

5. The syringe with buffer positioning in the injection machine according to claim 2, characterized in that: The connection structure between the pull rod shaft, the fixed plate, and the push plate is as follows: one end of the pull rod shaft abuts against the push plate, a bolt passes through the push plate, and the bolt is threaded to the end of the pull rod shaft. A through hole is provided on the fixed plate, and an oilless bearing is provided in the through hole. The other end of the pull rod shaft is slidably disposed in the oilless bearing. A limit screw is threadedly connected to the end of the pull rod shaft connected to the oilless bearing, and a limit ring is fitted on the limit screw.

Images