Rotary blow molding machine and cooling device for rotary blow molding machine

Abstract

Rotary blow molding machine and cooling device for rotary blow molding machine, comprising a blow molding device for blowing a preform into a bottle body, a bottle taking device for taking out the blown bottle body from the blow molding device and conveying the bottle body outward along a movement track, and a cooling device for cooling the conveyed bottle body. The bottle taking device includes a clamping mechanism for clamping the bottle body and a rotating device for driving the clamping mechanism. The clamping mechanism is fixedly installed on the rotating device. The cooling device is configured to cool the bottle body clamped by the clamping mechanism. By arranging the cooling device in the rotary blow molding machine, the bottle body taken out after blowing can be completely cooled and shaped through the cooling device during the process of being clamped by the bottle taking device and conveyed outward along the movement track, ensuring the molding quality of the bottle body and the yield rate of bottle body production.

Description

Technical Field

[0001] The present invention belongs to the technical field of blow molding machines, and particularly relates to a rotary blow molding machine and a cooling device for a rotary blow molding machine. Background Art

[0002] In the existing rotary blow molding machine, after the preform is heated, it is clamped by a conveying device and then placed into a blow molding die for blowing. The blown bottle body is taken out by a bottle taking device. After the bottle taking device clamps the bottle body and rotates it by a certain angle (such as 180° - 300°), the bottle body is conveyed to an out-bottle channel and sent out of the rotary blow molding machine. For some blown bottle bodies, the contact time between the bottom of the bottle and the bottom die is short, resulting in insufficient cooling. The taken-out bottle bodies are cooled at room temperature, which is very likely to cause the convex bottom deformation of the bottle bodies, and then the bottle bodies cannot meet the filling requirements. Even if the bottle bodies are recycled, it also causes energy waste and equipment loss in the process from raw materials to bottle bodies, reducing the overall social benefits. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a rotary blow molding machine and a cooling device for a rotary blow molding machine that can completely cool the blown bottle body and ensure the forming quality of the bottle body.

[0004] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0005] The rotary blow molding machine includes a blow molding device for blowing a preform into a bottle body, a bottle taking device for taking out the blown bottle body from the blow molding device and conveying the bottle body outward along a movement track, and a cooling device for cooling the conveyed bottle body. The bottle taking device includes a clamping mechanism for clamping the bottle body and a rotating device for driving the clamping mechanism. The clamping mechanism is fixedly installed on the rotating device. The cooling device is configured to provide cooling for the bottle body clamped by the clamping mechanism.

[0006] As a further improvement of the present invention, the cooling device includes a cooling providing device for providing cooling for the bottom of the bottle body, and the cooling providing device is arranged in association with the movement track.

[0007] As a further improvement of the present invention, the cooling providing device includes a cooling pipe, a cooling substance is conveyed in the cooling pipe, and the cooling pipe is below the movement track.

[0008] As a further improvement of the present invention, the cooling substance is a cooling gas, and a plurality of air outlet holes for providing cooling gas to the bottom of the bottle body are opened in the cooling pipe.

[0009] As a further improvement of the present invention, the distance between adjacent air outlet holes is 3 - 30 mm.

[0010] As a further improvement of the present invention, a plurality of convex walls are provided on the inner wall of the air outlet, and adjacent convex walls are arranged at intervals to form an air guide groove.

[0011] As a further improvement of the present invention, the cooling supply device further includes a gas supply pipe communicated with the cooling pipe, and both ends of the cooling pipe are communicated with the gas supply pipe.

[0012] As a further improvement of the present invention, at least one joint communicated with the gas supply pipe is further provided on the pipe body of the cooling pipe for introducing cooling gas by communicating with the gas supply pipe.

[0013] As a further improvement of the present invention, it further includes a cooler for creating a cooling environment for the cooling supply device, and the cooler is connected to the cooling supply device.

[0014] Based on the above-provided rotary blow molding machine, the present invention further provides a cooling device for the above rotary blow molding machine, which is the above cooling device.

[0015] The beneficial effects of the present invention are as follows: By arranging a cooling device in the rotary blow molding machine, the bottle body taken out after blowing can be completely cooled and shaped through the cooling device during the process of being clamped by the bottle taking device and conveyed outward along the movement track, ensuring the forming quality of the bottle body and the yield rate of bottle body production; it solves the problem that after the preform is blown into a bottle body, due to the short contact time between the bottom of the bottle body and the bottom mold, the bottom of the bottle body can only be completely cooled after being taken out of the bottle and cooled at room temperature for a period of time, resulting in the problem of convex bottom deformation. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a rotary blow molding machine;

[0017] Figure 2 It is a schematic structural diagram of the air outlet;

[0018] Figure 3 It is a schematic structural diagram when the cooling water channel and the cooling air channel in the cooler are parallelly distributed in space;

[0019] Figure 4 It is a schematic structural diagram when the cooling water channel and the cooling air channel in the cooler are perpendicularly distributed in space;

[0020] Figure 5 It is a schematic structural diagram when the cooling water channel and the cooling air channel in the cooler are staggeredly distributed in space. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] Embodiment:

[0023] As Figures 1 to 5 shown, this embodiment discloses a rotary blow molding machine, which includes a blow molding device 1 for blowing a preform into a bottle body, a bottle taking device 2 for taking out the blown bottle body from the blow molding device 1 and conveying the bottle body outward along a movement track 5 to an out-bottle channel 4, a cooling device for cooling the bottom of the conveyed bottle body, and an out-bottle channel 4 for sending the bottle body out of the rotary blow molding machine. Both the blow molding device 1 and the out-bottle channel 4 are located on the outer periphery of the bottle taking device 2. The bottle taking device 2 includes a clamping mechanism 21 for clamping the bottle body and a rotating device 22 for driving the clamping mechanism 21 to travel along a set movement track 5. After the preform is blown into a bottle body in the blow molding device 1, the rotating device 22 drives the clamping mechanism 21 to move towards the blow molding device 1. Then the clamping mechanism 21 opens, extends into the blow molding device 1 to clamp the bottle body, and then the clamping mechanism 21 retracts to take out the bottle body from the blow molding device 1. Then the rotating device 22 operates to drive the clamping mechanism 21 holding the bottle body to move towards the out-bottle channel 4. A bottle pulling rod 6 is also provided between the bottle taking device 2 and the out-bottle channel 4. The rotating bottle pulling rod 6 pulls the bottle body away from the clamping mechanism 21, and the bottle body enters the out-bottle channel 4. During the process of the bottle body moving towards the out-bottle channel 4 after being taken out, the bottom of the bottle body is continuously cooled by the cooling device, so that the bottom of the bottle body is completely cooled and shaped, avoiding the phenomenon of convex bottom deformation when the bottle body is conveyed on the out-bottle channel 4 due to incomplete cooling.

[0024] In this embodiment, the rotating part of the rotating device 22 is in the shape of a disc. A number of clamping mechanisms 21 are installed on the rotating device 22. The rotating device 22 drives the clamping mechanism 21 to perform a circular motion, and the corresponding movement track 5 is a circular motion track. The traveling range of the clamping mechanism involves the entire circular motion track; while the traveling range of the bottle body is approximately the 270° arc range of the circular motion track; the cooling range provided by the cooling device is approximately the 80 - 150° arc range of the circular motion track. It should be understood that the traveling range of the bottle body and the cooling range provided by the cooling device can be set as required. The setting of the cooling device is related to the traveling range of the bottle body, that is, the movement track of the bottle body.

[0025] In this embodiment, the cooling device includes a cooling supply device 31 for providing cooling to the bottom of the bottle body and a cooler 32 for creating a cooling environment for the cooling supply device 31. The cooler 32 is connected to the cooling device. When the cooler 32 operates, a cooling substance is transported to the cooling supply device 31. The cooling supply device 31 transports the cooling substance towards the bottom of the bottle body, thereby forming a cooling area at the bottom of the bottle body. The bottom of the bottle body is completely cooled and shaped in the cooling area. The cooling supply device 31 can be configured at least at two positions, and these positions are associated with the movement trajectory 5 of the clamping mechanism 21 clamping the bottle body and transporting it to the bottle outlet channel 4. This position can be either directly below the movement trajectory 5 of the bottle body or obliquely below the movement trajectory 5 of the bottle body, as long as a cooling area is formed towards the bottom of the bottle body accordingly. The configured position of the cooling supply device 31 can be selected according to the actual situation. Of course, in actual applications, the cooler 32 can cool the cooling supply device 31 itself or the cooling substance inside it, both of which can achieve the cooling of the bottom of the bottle body.

[0026] In this embodiment, the cooling supply device 31 includes a cooling pipe 311 and a gas supply pipe 312 with one end communicating with the cooling pipe 311. The other end of the gas supply pipe 312 is connected to the cooler 32. The cooling pipe 311 is provided with a plurality of air outlet holes 313 for supplying cooling gas to the bottom of the bottle body. The air outlet holes 313 discharge air towards the bottom of the bottle body, and the cooling pipe 311 is located below the movement trajectory 5 of the bottle body. In order to make the air discharged from the air outlet holes 313 uniform, stable and have a certain directionality, a plurality of convex walls 314 are arranged on the inner wall of the air outlet holes 313. The convex walls 314 in the air outlet holes 313 are arranged at intervals to form a plurality of air guiding grooves 315. Of course, in order to change the air discharge direction or increase the cooling area of the cooling gas, the convex walls 314 are arranged with the plate surface inclined in one direction or spirally inclined in one direction. Of course, the convex walls 314 can also be inclined in one direction with other curved surfaces or irregular shaped grooves, and can be specifically set according to the air discharge requirements.

[0027] As a preferred implementation manner, both ends of the cooling pipe 311 are communicated with the gas supply pipe 312, and the cooling gas is introduced from both ends of the cooling pipe 311, so that the air discharge pressure of each air outlet hole 313 on the cooling pipe 311 is more uniform. This avoids the problem that when the air enters from a single end, the air pressure of the air outlet holes 313 near the gas supply pipe 312 is large, while the air pressure of the air outlet holes 313 far from the gas supply pipe 312 is small, and the air discharge pressures of each air outlet hole 313 on the cooling pipe 311 are not equal, resulting in poor cooling effect. To further optimize the cooling effect, the distance between the cooling pipe 311 and the bottom of the bottle body is controlled within the range of 1 - 20 mm, preferably 3 - 8 mm.

[0028] When the cooling pipe 311 is relatively long, in order to further balance the air outlet pressure of each air outlet hole 313 on the cooling pipe 311 and make the air outlet pressure of each air outlet hole 313 uniform and stable, at least one joint communicating with the air supply pipe 312 is arranged in the middle or other appropriate positions of the cooling pipe 311 to introduce cooling gas. Specifically, according to the length of the cooling pipe 311, an air outlet hole 313 can be opened every distance L1 on the cooling pipe 311. L1 ranges from 3 to 30 mm, preferably 8 to 15 mm. The adjacent air outlet holes 313 can be arranged at equal intervals or unequal intervals, and can be specifically set according to the cooling requirements. Correspondingly, a joint communicating with the air supply pipe 312 is arranged every distance L2 on the cooling pipe 311. L2 ranges from 6L1 to 100L1. When setting the joint, the joint can be set according to the preset air outlet pressure value P1 and the allowable air outlet pressure reduction value P2 of the air outlet hole 313. First, connect the air supply pipes 312 at both ends of the cooling pipe 311. The air supply pipes 312 introduce cooling gas into the cooling pipe 311, and the cooling gas is discharged from the air outlet holes 313, and then measure the actual pressure values P3 of each air outlet hole 313 in turn from both ends of the cooling pipe 311. If the actual pressure values P3 of each air outlet hole 313 are all within the range of (P1 - P2) to P1, then each air outlet hole 313 meets the preset air outlet pressure requirements, and no additional joint needs to be added to the cooling pipe 311. If among the measured actual pressure values P3 of each air outlet hole 313, there is an air outlet hole 313 with an actual pressure value P3 < P1 - P2, set the joint according to the following situations:

[0029] ① If the number of air outlet holes 313 with the measured actual pressure value P3 < P1 - P2 is 1 or 2, set a joint in the middle of the cooling pipe 311;

[0030] ② If the number of air outlet holes 313 with the measured actual pressure value P3 < P1 - P2 is at least three, select the low-pressure hole Ⅰ and the low-pressure hole Ⅱ that are respectively the closest to both ends of the cooling pipe 311 along the movement track 5 among the air outlet holes 313 with the actual pressure value P3 < P1 - P2. Measure the distances from the low-pressure hole Ⅰ and the low-pressure hole Ⅱ to the corresponding closest ends of the cooling pipe 311 as L3 and L4 respectively. Select the smaller value of L3 and L4 as the reference basic distance X for the joint setting position, and then measure the distance L5 between the low-pressure hole Ⅰ and the low-pressure hole Ⅱ along the movement track 5, and then determine the position where the joint is set in the cooling pipe 311. If L5 ≤ X, then set a joint communicating with the air supply pipe 312 in the cooling pipe 311 where the low-pressure hole Ⅰ and the low-pressure hole Ⅱ are located respectively. The joint communicates with the air supply pipe 312 to supply cooling gas. If L5 > X, then use L5 ÷ The numerical value of X is rounded up to an integer n, and the positions of the joints in the cooling pipe 311 are determined. A joint communicating with the air supply pipe 312 is provided in each of the cooling pipes 311 where the low-pressure holes I and II are located. At the same time, on the cooling pipe 311 between the low-pressure holes I and II, a joint is provided every distance L6 from the low-pressure hole I or the low-pressure hole II, and L6 = L5÷n. Of course, the cooling pipe 311 can also be a longer cooling pipe 311 formed by arranging several shorter cooling pipes 311 along the movement track 5. The two ends of the shorter cooling pipes 311 are connected to the air supply pipe 312, and the shorter cooling pipes 311 are not connected to each other, so that the air pressure is not affected by each other. When the cooling pipe 311 is short, the air pressure values between the air outlet holes 313 are not very different, and the cooling effect is uniform.

[0031] As a preferred embodiment, the cooling pipe 311 is provided with a support member to keep the cooling pipe 311 in a relatively fixed position with respect to the movement track 5, so as to ensure the cooling effect, as well as the uniformity and stability of cooling at each position of the movement track 5. The cooling pipe 311 can be a copper pipe, a plastic pipe, or the like.

[0032] As a preferred embodiment, the cooler 32 includes at least two stacked spaces, and at least one of the spaces is provided with a zigzag cooling water channel 321, and a cooling air channel 322 that is parallel / perpendicular / staggered in space with the cooling water channel 321 is provided in the space adjacent to this layer. The water inlet and outlet of the circulating cooling water pipe are connected to both ends of the cooling water channel 321, the air inlet end of the cooling air channel 322 is connected to a gas supply device such as a gas source device, and the air outlet end of the cooling air channel 322 is connected to the air inlet end of the air supply pipe 312. When the cooling water channel 321 and the cooling air channel 322 are parallel in space, the cooling water channel 321 can be shaped accordingly with the gas path of the cooling air channel 322 to obtain a larger heat exchange area, and the cooling effect of the cooling air channel 322 is better; when the cooling water channel 321 and the cooling air channel 322 are perpendicular / staggered in space, the arrangement of the cooling water channel 321 or the cooling air channel 322 is dense to obtain a larger heat exchange area. During the actual operation of the cooling device, the air pressure in the air supply pipe 312 is in the range of 0.4 to 1 MPa. Because when the air pressure in the air supply pipe 312 is lower than 0.4 Mpa, the cooling effect at the bottom of the bottle body is poor and cannot meet the cooling requirements of the bottom of the bottle body; when the air pressure in the air supply pipe 312 is higher than 1 Mpa, the bottle body is easily blown away; when the air pressure is in the range of 0.4 to 1 MPa, it can not only meet the cooling requirements of the bottom of the bottle body, but also prevent the bottle body from being blown away. The temperature of the cooling water in the cooler 32 is controlled in the range of 8 to 15 °C. When the temperature of the cooling water is lower than 8 °C, the temperature of the cooling gas is too low, which easily causes molding defects at the bottom of the bottle body; when the temperature of the cooling water is higher than 15 °C, the temperature of the cooling gas is too high, and the cooling effect at the bottom of the bottle body is poor and cannot meet the cooling requirements of the bottom of the bottle body; when the temperature of the cooling water is controlled in the range of 8 to 15 °C, it meets the cooling requirements of the bottom of the bottle body; especially in the range of 10 to 12 °C, the cooling effect on the bottom of the bottle body is the best.

[0033] The above is only the preferred embodiment of the present invention, and all technical solutions that achieve the purpose of the present invention by basically the same means fall within the protection scope of the present invention.

Claims

1. Rotary blow molding machine, characterized in that: It includes a bottle blowing device for blowing a preform into a bottle body, a bottle taking device for taking out the blown bottle body from the bottle blowing device and conveying the bottle body outward along a movement track, and a cooling device for cooling the conveyed bottle body. The bottle taking device includes a clamping mechanism for clamping the bottle body and a rotating device for driving the clamping mechanism. The clamping mechanism is fixedly installed on the rotating device. The cooling device is configured to cool the bottle body clamped by the clamping mechanism. The cooling device includes a cooling providing device for providing cooling to the bottom of the bottle body. The cooling providing device is arranged in association with the movement track. The cooling providing device includes a cooling pipeline and a gas supply pipeline with one end communicating with the cooling pipeline. Both ends of the cooling pipeline are communicated with the gas supply pipeline. The rotary bottle blowing machine further includes a cooler for creating a cooling environment for the cooling providing device. The cooler is connected to the cooling providing device. The cooler includes at least two stacked spaces. At least one of the spaces is provided with a zigzag cooling water channel. An adjacent space is provided with a cooling air channel that is parallel or staggered with the cooling water channel in space. The water inlet and outlet of the circulating cooling water pipe are connected to both ends of the cooling water channel. The air inlet end of the cooling air channel is connected to a gas source device. The air outlet end of the cooling air channel is connected to the air inlet end of the gas supply pipeline.

2. The rotary blow molding machine according to claim 1, wherein: The traveling range of the clamping mechanism covers the entire circumferential movement track. The cooling range provided by the cooling device is an arc range of 80°-150° of the circumferential movement track.

3. The rotary blow molding machine according to claim 1, wherein: Cooling substances are conveyed in the cooling pipeline, and the cooling pipeline is below the movement track.

4. The rotary blow molding machine according to claim 3, wherein: The cooling substance is a cooling gas, and a plurality of air holes for providing cooling gas to the bottom of the bottle body are opened in the cooling pipeline.

5. The rotary blow molding machine according to claim 4, characterized in that: The distance between adjacent air holes is 3-30 mm.

6. The rotary blow molding machine according to claim 4, wherein: A plurality of convex walls are arranged on the inner wall of the air hole, and adjacent convex walls are arranged at intervals to form a gas guiding groove.

7. The rotary blow molding machine according to claim 4, wherein: At least one joint communicating with the gas supply pipeline is further provided on the pipe body of the cooling pipeline for introducing cooling gas by connecting the gas supply pipeline.

8. Cooling device for a rotary blow molding machine, characterized in that: The cooling device is the cooling device according to any one of claims 1-7.

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