Multi-Blow Needle Balancing Mechanism in Blow Molding Machine

Abstract

The utility model discloses a multi-blow needle balancing mechanism in a blow molding machine, comprising: a diverter plate, a main flow channel, a plurality of diverters and a vent hole are arranged in the diverter plate, each diverter is connected with a blow needle balancing cylinder, and the blow needle balancing cylinder comprises: a cylinder body, an upper cover and a lower cover are arranged on the cylinder body, the upper cover is connected with the diverter plate, a feed hole is arranged on the upper cover, a piston rod is arranged in a movable seal in the cylinder body, an adjustment spring is sleeved on the piston rod, the piston rod is connected with a fixed plate, an adjustment seat is arranged on the fixed plate, a T-shaped hole is arranged in the adjustment seat, a blow needle is slidably arranged in the T-shaped hole, and a set screw is threadedly connected on the four side walls of the adjustment seat, and the four set screws are all against the blow needle located in the T-shaped hole. When the mold cavity in the mold is not in the same horizontal plane, each blow needle can also be sealed and connected with the corresponding mold cavity to complete high-quality blowing, thereby ensuring the finished product quality of the blow molded product.

Description

Technical Field

[0001] The utility model relates to the field of blow molding machines, in particular to a multi-blow needle balancing mechanism in a blow molding machine. Background Art

[0002] In the process of producing plastic bottles, after the plastic preform enters the mold cavity, it is necessary to use a blow pin to blow air into the plastic preform, so that the plastic preform expands and fits the mold cavity wall to form. There are generally multiple mold cavities in the mold. Due to the dimensional error in the process of producing the mold and the assembly error in the installation process, it is easy to cause a small height difference between the mold cavities due to the cumulative error when installing the mold, and it is impossible to ensure that the cutout positions of all the mold cavities in the mold are on the same horizontal plane. At present, the blow pins on the market are fixed on a plate by hard connection. When multiple blow pins are used to blow air into the plastic preforms in all the mold cavities in the mold, it is impossible to ensure that all the blow pins can be sealed and fit with the corresponding mold cavities, which will cause the plastic preforms in the mold cavities that are not sealed and fit with the blow pins to fail to be completely formed and become defective products. Even if the cumulative error is overcome during the installation process and the cutout positions of all the mold cavities in the mold are on the same horizontal plane, after long-term use, the wear of the cutout positions of each mold cavity and the wear of the blow pin heads are inconsistent, which will also cause some blow pins to fail to seal and fit with the corresponding mold cavities. Utility Model Content

[0003] The utility model aims to provide a multi-blow needle balancing mechanism in a blow molding machine which can effectively solve the above-mentioned problem.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a multi-blow needle balancing mechanism in a blow molding machine, comprising: a diverter plate, a main flow channel, a plurality of diverter channels and an air release hole are arranged in the diverter plate, a first wire plug is threadedly connected to the air release hole, the diverter channel is located on the lower side wall of the diverter plate, each diverter channel is connected to a blow needle balancing cylinder, and the blow needle balancing cylinder comprises: a cylinder body, an upper cover and a lower cover are respectively arranged at the upper and lower ends of the cylinder body, the upper cover is sealed and connected to the lower side wall of the diverter plate, and a plug connected to any one of the diverter channels is arranged on the upper cover A feed hole is provided in the cylinder body with a movable seal, and an adjusting spring is sleeved on the piston rod, and the adjusting spring abuts against the lower cover. After the piston rod extends out of the lower cover, it is connected to the fixed plate, and an adjusting seat is provided on the fixed plate. A T-shaped hole is provided in the adjusting seat, and a blowing needle is slidably provided in the T-shaped hole. The blowing needle slides and abuts between the fixed plate and the adjusting seat, and an adjusting gap is left between the blowing needle and the side walls around the T-shaped hole. A set screw is threadedly connected to the four side walls of the adjusting seat, and the four set screws abut against the blowing needle located in the T-shaped hole.

[0005] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, an oil injection hole is provided on the main flow channel, and a second wire plug is threadedly connected to the oil injection hole.

[0006] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, a sealing ring is provided on the outer wall of the upper cover, and the upper cover is inserted into the cylinder body and is sealed and connected to the inner wall of the cylinder body through the sealing ring.

[0007] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, two circles of Gly rings are arranged on the outer wall of the piston rod, and the piston rod is movably sealed with the inner wall of the cylinder body through the Gly rings.

[0008] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, a transition hole connected to the feed hole is opened on the top wall of the upper cover, and the aperture of the transition hole is larger than the aperture of the branch channel.

[0009] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, a guide copper sleeve is provided on the lower cover, and the piston rod is slidably clamped in the guide copper sleeve.

[0010] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, a spring washer is sleeved on the outer side of the piston rod, the spring washer abuts against the top of the guide copper sleeve, and the adjustment spring abuts against the spring washer.

[0011] Furthermore, in the aforementioned multi-blow needle balancing mechanism of the blow molding machine, a positioning pin parallel to the piston rod is provided on the lower cover, the positioning pin extends downward from the lower cover, a positioning hole is opened on the fixing plate, and the positioning pin extends into the positioning hole.

[0012] The utility model has the advantages that: when the mold cavity and the blow needle are not aligned coaxially up and down due to cumulative errors and assembly errors, the horizontal position of the blow needle can be adjusted by screwing the set screw in the adjustment seat, so that the blow needle and the corresponding mold cavity are aligned coaxially up and down; when the mold cavity has a height difference due to cumulative errors, the blow needle forms a soft connection with the manifold through the blow needle balancing cylinder, and the blow needle connected to each blow needle balancing cylinder is balanced and adjusted by flowing grease. When the high-position mold cavity contacts the blow needle, the blow needle pushes the piston rod upward Movement will push the grease back into the diverter and main channel of the diverter plate, and the excess grease in the diverter and main channel will enter the blow needle balance cylinder that is not in seal contact with the mold cavity, pushing the piston rod in the blow needle balance cylinder downward, so that the blow needle in the blow needle balance cylinder moves downward and contacts with the corresponding mold cavity seal. When the blow needles in all the blow needle balance cylinders are in seal contact with their respective mold cavities, blowing can be carried out, so that each blow needle can be seal-connected with its corresponding mold cavity to complete high-quality blowing, thereby ensuring the quality of the finished product of the blow-molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a multi-blow needle balancing mechanism in a blow molding machine described in the utility model. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0015] like Figure 1As shown, the multi-blow needle balancing mechanism in the blow molding machine described in the utility model comprises: a diverter plate 1, in which a main flow channel 11, a plurality of diverter channels 12 and an air release hole 13 are arranged, and a first wire plug is threadedly connected to the air release hole 13, which is not shown in the figure, and an oil injection hole 14 is arranged on the main flow channel 11, and a second wire plug is threadedly connected to the oil injection hole 14, which is not shown in the figure, and the diverter channel 12 is located on the lower side wall of the diverter plate 1, and each diverter channel 12 is connected to a blow needle balancing cylinder 2, and the blow needle balancing cylinder 2 comprises: a cylinder body 21, and an upper cover 22 and a lower cover 23 are respectively arranged at the upper and lower ends of the cylinder body 21, and the upper cover 22 is sealed and connected to the lower side wall of the diverter plate 1, and a transition hole 221 and a feed hole 222 that are connected are arranged on the upper cover 22, and the transition hole 221 and the ... The aperture of the hole 221 is larger than the aperture of the shunt channel 12. When the upper cover 22 is sealed and connected to the lower side wall of the shunt plate 1, the transition hole 221 is connected to any one of the shunt channels 12. A sealing ring 223 is provided on the outer wall of the upper cover 22. The upper cover 22 is inserted into the cylinder body 21 and is sealed and connected to the inner wall of the cylinder body 21 through the sealing ring 223. A guide copper sleeve 231 is provided on the lower cover 23 and is connected through bolts. A spring washer 232 is provided on the top of the copper sleeve 231. When the lower cover 23 is connected to the cylinder body 21, the lower end of the cylinder body 2 abuts against the spring washer 232, and the cylinder body 21 cooperates with the lower cover 23 to fix the spring washer 232. A plurality of countersunk holes are evenly distributed on the circumference of the lower cover 23, and the same number of countersunk holes is evenly distributed on the circumference of the cylinder body 21. The connecting through hole is uniformly distributed on the circumference of the upper cover 22 with threaded holes of the same number as the countersunk holes, each countersunk hole is coaxially aligned with a connecting through hole up and down, each connecting through hole is coaxially aligned with a threaded hole, and a hexagon socket bolt 24 is passed through the countersunk hole and the connecting through hole and is threadedly connected with the threaded hole, so as to fix the upper cover 22, the cylinder body 21 and the lower cover 23 together, and a piston rod 25 is movably arranged in the cylinder body 21, and the piston rod 25 passes through the spring washer 232 and is movably clamped in the guide copper sleeve 231 and extends downward from the lower cover 23, and two circles of grid rings 251 are arranged on the outer wall of the piston rod 25, and the piston rod 25 is connected to the inner wall of the cylinder body 21 through the grid ring 251 Movable seal, an adjusting spring 252 is sleeved on the piston rod 25, and the adjusting spring 252 abuts against the spring washer 232 of the lower cover 23 to prevent the adjusting spring 252 from damaging the guide copper sleeve 231. The piston rod 25 extending out of the lower cover 23 is connected to the fixed plate 3, and a positioning pin 26 parallel to the piston rod 25 is arranged on the lower cover 23. The positioning pin 26 extends downward from the lower cover 23. A positioning hole 31 is opened on the fixed plate 3, and the positioning pin 26 extends into the positioning hole 31. The positioning pin 26 cooperates with the positioning hole 31 to guide the fixed plate 3. An adjusting seat 4 is arranged on the fixed plate 3, and a T-shaped hole 41 is arranged in the adjusting seat 4. A blow needle 5 is clamped in the T-shaped hole 41, and the blow needle 5 slides and abuts between the fixed plate 3 and the adjusting seat 4.There is an adjustment gap between the blow needle 5 and the surrounding side walls of the T-shaped hole 41. A set screw 42 is threadedly connected on each of the four side walls of the adjustment seat 4. The four set screws 42 are all against the blow needle 5 located in the T-shaped hole 41. By screwing the four set screws 42, the blow needle 5 can be adjusted in four horizontal directions, front, back, left, and right. When there is an installation error in the mold, the blow needle 5 cannot be coaxially aligned with the corresponding mold cavity up and down, it is necessary to use the lifting mechanism to lower the manifold 1 and the blow needle balance cylinders 2 fixed on the manifold 1 to the top of the mold, and then adjust the horizontal position of the blow needle 5 by screwing the four set screws 42 until the blow needle 5 is coaxial with the corresponding mold cavity, and tighten all four set screws 42 to fix the blow needle 5.

[0016] Before use, fix the diverter plate 1 on the lifting mechanism, and then inject grease into the main channel 11 through the oil filling hole 14. During the process of injecting grease, it is necessary to loosen the first thread plug on the vent hole 13. In this way, when injecting grease, the air in the main channel 11 and the diverter channel 12 will be discharged through the vent hole 13. Due to the high density of grease and the small exhaust gap formed after loosening the first thread plug on the vent hole 13, the grease will not flow out from the vent hole 13. When the grease fills the main channel 11 and the diverter channel 12, tighten the first thread plug to seal the vent hole 13, and the grease enters the corresponding transition hole 221 along the main channel 11 and the diverter channel 12. Since the transition hole 221 is larger than the diverter channel 12, the grease can pass through the vent hole 13. The transition hole 221 can transfer the grease to the feed hole 222 more quickly, and then enter the cylinder body 21 to push the piston rod 25. When the thrust of the grease applied to the piston rods 25 in all the blow needle balancing cylinders 2 is greater than the elastic force of the adjusting spring 252, it means that the space between the piston rod 25 and the upper cover 22 is full of grease. The two circles of grid rings 251 on the piston rod 25 can effectively block the grease from entering the cavity between the piston rod 25 and the lower cover 23, and the oil filling is completed. After the oil filling work is completed, the oil filling hole 14 is blocked with a second wire plug. The piston rod 25 will cause a certain compression to the adjusting spring 252 under the push of the grease, and the grease will flow in the main channel 11, the branch channel 12 and each blow needle balancing cylinder 2.

[0017] When in use, the lifting mechanism drives the manifold 1 to drive all the blow needle balancing cylinders 2 to move downward together to contact each mold cavity in the mold. If the mold cavity in the mold is uneven, the blow needle 5 in the blow needle balancing cylinder 2 corresponding to the high-position mold cavity will first contact and seal the mold cavity, and then the lifting mechanism continues to drive the manifold 1 to drive all the blow needle balancing cylinders 2 to move downward. The blow needle 5 that first contacts the mold cavity in a sealed manner will drive the piston rod 25 to move upward in the cylinder body 21 under the action of the reaction force, and will not damage the seal between the blow needle 5 and the mold cavity. The piston rod 25 has a sealing contact effect, and the grease in the cylinder body 21 is pushed back into the branch channel 12 and the main channel 11 during the upward movement. The excess grease in the branch channel 12 and the main channel 11 will enter the blow needle balance cylinder 2 that is not in sealing contact with the mold cavity, pushing the piston rod 25 in the blow needle balance cylinder 2 downward, so that the blow needle 5 in the blow needle balance cylinder 2 moves downward and contacts with the corresponding mold cavity. When the blow needles 5 in all the blow needle balance cylinders 2 are in sealing contact with their corresponding mold cavities, the blowing work can be carried out.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A multi-blow needle balancing mechanism in a blow molding machine, characterized in that: include: A manifold, a main flow channel, a plurality of manifolds and an air release hole are arranged in the manifold, a first plug is threadedly connected to the air release hole, the manifold is located on the lower side wall of the manifold, each manifold is connected to a blow needle balancing cylinder, the blow needle balancing cylinder comprises: a cylinder body, an upper cover and a lower cover are respectively arranged at the upper and lower ends of the cylinder body, the upper cover is sealed and connected to the lower side wall of the manifold, a feed hole connected to any manifold is arranged on the upper cover, a piston rod is movably and sealably arranged in the cylinder body An adjusting spring is mounted on the piston rod, and the adjusting spring rests on the lower cover. After the piston rod extends out of the lower cover, it is connected to the fixed plate. An adjusting seat is arranged on the fixed plate, and a T-shaped hole is arranged in the adjusting seat. A blowing needle is slidingly arranged in the T-shaped hole. The blowing needle slides and rests between the fixed plate and the adjusting seat. An adjusting gap is left between the blowing needle and the side walls around the T-shaped hole. A locking screw is threadedly connected to the four side walls of the adjusting seat, and the four locking screws rest on the blowing needle in the T-shaped hole.

2. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: An oil filling hole is arranged on the main flow channel, and a second thread plug is threadedly connected to the oil filling hole.

3. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: A sealing ring is arranged on the outer side wall of the upper cover, and the upper cover is inserted into the cylinder body and is sealed and connected with the inner side wall of the cylinder body through the sealing ring.

4. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: Two circles of Gly rings are arranged on the outer side wall of the piston rod, and the piston rod is movably sealed with the inner side wall of the cylinder body through the Gly rings.

5. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: A transition hole connected with the feed hole is provided on the top wall of the upper cover, and the aperture of the transition hole is larger than the aperture of the branch channel.

6. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: A guide copper sleeve is arranged on the lower cover, and the piston rod is slidably clamped in the guide copper sleeve.

7. The multi-blow needle balancing mechanism in the blow molding machine according to claim 6, characterized in that: A spring washer is sleeved on the outer side of the piston rod. The spring washer abuts against the top of the guide copper sleeve, and the adjusting spring abuts against the spring washer.

8. The multi-blow needle balancing mechanism in the blow molding machine according to claim 1, characterized in that: A positioning pin parallel to the piston rod is arranged on the lower cover, the positioning pin extends downward from the lower cover, a positioning hole is opened on the fixing plate, and the positioning pin extends into the positioning hole.

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