Exhaust control device and exhaust control method for blow molding mold

Abstract

The present invention relates to an exhaust control device and an exhaust control method for a blow molding mold, and belongs to the technical field of special-shaped tube blow molding. It solves the problems of slow cooling and easy blockage of the exhaust channel in the prior art of special-shaped tube blow molding. The exhaust control device of the blow molding mold is provided with a core pulling mechanism on the mold, and a core pulling block on the core pulling mechanism. The core pulling block is communicated with the mold cavity, and an air inlet channel communicated with the mold cavity is provided on the mold. The mold is provided with an exhaust channel, and the core pulling block is arranged between the mold cavity and the exhaust channel. The core pulling mechanism drives the core pulling block to extend and retract to control the exhaust channel and the mold cavity. The core pulling mechanism is used as an on-off switch between the exhaust channel and the mold cavity. After the blow molding of the product is completed, the exhaust channel is still closed to form a pressure maintenance in the mold cavity; after the pressure maintenance is completed, the exhaust channel is opened to discharge the hot air in the mold; at the same time, the air inlet channel is still kept in a gas-filled state, the air flows, and the hot air in the mold cavity is discharged, thereby improving the cooling efficiency.

Description

Technical Field

[0001] The invention belongs to the field of special-shaped tube blow molding, and in particular relates to an exhaust control device and an exhaust control method for a blow molding mold. Background Art

[0002] During the blow molding process, the blow molding machine needs to inject high-pressure gas into the tubular plastic preform so that the tubular plastic preform is inflated and tightly attached to the inner wall of the mold to form the desired product. However, the semi-automatic blow molding machines currently used generally use a single pipe to discharge high-pressure gas. Due to the high pressure of the discharged high-pressure gas, the internal high-pressure gas of the blow-molded product cannot be discharged through the exhaust pipe in time during the production process of the bottle blowing machine, resulting in a lot of noise. The existing equipment does not have relevant noise reduction equipment, and the huge noise generated during the production process is easy to damage the hearing of employees. At the same time, people near the blow molding machine are easily frightened by the sudden noise, which endangers the physical and mental health of employees.

[0003] The invention patent with publication number CN110480949B discloses an engine exhaust pipe core pulling mechanism, including an upper template, a lower template, a mold foot, a product, a pin plate and a mold core for molding the product, the upper template is located on the upper surface of the lower template, the lower template is located between the upper template and the mold foot, the pin plate slides up and down between the mold foot and the lower template, the mold core includes a first mold core for molding the lower end of the product and a second mold core for molding the upper end of the product, the first mold core corresponds to the linear core pulling of a small part of the product, the second mold core corresponds to the arc core pulling of most of the product, the upper surface of the lower template is provided with a first opening groove along the width direction of the lower template, the upper surface of the lower template is provided with a second opening groove along the length direction of the lower template, and one end of the second opening groove is connected to the first opening groove.

[0004] With regard to the special-shaped blow-molded parts, the above-mentioned prior art still fails to solve the defects such as large shape variations of the blow-molded parts, many corner bends, long pressure holding time required after the blow molding of the products, long cooling time required after the products are molded, and the small air vents are easily blocked by waste materials and the air vents need to be cleaned every shift, thus resulting in low production efficiency. Summary of the invention

[0005] The purpose of the present invention is to solve the above problems in the prior art and to propose an exhaust control device for linking a core pulling structure to an exhaust channel in a blow mold.

[0006] In order to achieve the innovation, the purpose of the present invention can be achieved through the following technical solutions: an exhaust control device for a blow molding mold, wherein the mold is provided with a core pulling mechanism, the core pulling mechanism is provided with a core pulling block, the core pulling block is communicated with the mold cavity, the mold is provided with an air inlet channel communicated with the mold cavity, the mold is provided with an exhaust channel, the core pulling block is arranged between the mold cavity and the exhaust channel, and the core pulling mechanism drives the core pulling block to extend and retract to control the connection and disconnection of the exhaust channel and the mold cavity.

[0007] The core pulling mechanism is used as the on-off switch between the exhaust channel and the mold cavity to ensure that the exhaust channel remains closed after blow molding is completed, thereby maintaining pressure in the mold cavity. After the pressure maintenance is completed, the core pulling mechanism contracts and the core pulling block is separated from the mold cavity. At this time, the exhaust channel is opened to discharge the hot air in the mold. At the same time, the air inlet channel remains filled with gas to form air flow, discharge the hot air in the mold cavity, and improve cooling efficiency.

[0008] In the above-mentioned exhaust control device for a blow molding mold, the core pulling mechanism is an air cylinder or an oil cylinder, one end of the piston rod of the air cylinder or the oil cylinder is connected to the core pulling block, and the core pulling block is provided with a molding surface at the end away from the piston rod. The core pulling block is close to the mold cavity as a molding surface and also needs to participate in molding. Under the drive of the oil cylinder or the air cylinder, the exhaust channel is closed when it is close to the mold cavity; after molding is completed, the exhaust channel is opened while it is away from the mold cavity.

[0009] In the above-mentioned exhaust control device for a blow molding mold, one end of the exhaust channel is located inside the mold, and the other end is located outside the mold. The end of the exhaust channel close to the mold is arranged on the movement track of the core pulling block, and the side of the core pulling block can be against the end of the exhaust channel close to the mold. The end of the exhaust channel close to the mold can be abutted by the side of the core pulling block, so that the opening and closing of the exhaust channel can be controlled by the in and out of the core pulling block.

[0010] In the above-mentioned exhaust control device of a blow molding mold, a muffler box communicating with the exhaust channel is further provided on the outside of the mold, the muffler box includes an air inlet and an air outlet arranged on the other side of the air inlet, and a muffler baffle is further provided inside the muffler box, and the muffler baffle forms a muffler cavity inside the muffler box. The muffler box performs muffler noise reduction and pollution treatment on the exhaust gas discharged from the exhaust channel to ensure that the final discharged gas is clean and environmentally friendly.

[0011] In the above-mentioned exhaust control device for a blow molding mold, the muffler baffle includes a top plate arranged on the top of the muffler box and a bottom plate arranged on the bottom of the muffler box, the top plate is arranged near the air inlet, the number of the top plates is 3, the number of the bottom plates is 2, and the top plates and the bottom plates are alternately installed to form a serpentine channel. The cooperation of the top plate and the bottom plate, plus the formed serpentine channel, ensures the contact area and retention time of the gas in the muffler box, and finally achieves muffler and noise reduction.

[0012] In the above-mentioned exhaust control device for a blow molding mold, the air inlet and the air outlet are both arranged at the upper end of the side of the muffler box. Due to the characteristics of gas temperature, the density is small when the temperature is high, so it will rise. If the air inlet is arranged at the lower end, it is difficult to form a downward pressure speed, so the air inlet is arranged at the upper end; the air outlet is also arranged at the upper end to facilitate the final discharge.

[0013] In the above-mentioned exhaust control device for a blow molding mold, a sound-absorbing buffer cotton and a sound-absorbing hole are provided on the bottom plate, and the material of the sound-absorbing buffer cotton is polyester fiber.

[0014] In the above-mentioned exhaust control device for a blow molding mold, a guide plate is further provided at the bottom of the muffler box on one side of the air inlet. The guide plate is L-shaped and the bottom is perpendicular to the muffler baffle. The number of the guide plates is 2 and they are parallel to each other. The guide plate guides the flowing gas, and realizes the turning of the gas without causing blockage.

[0015] In the above-mentioned exhaust control device for a blow molding mold, a particle catcher is also provided at the bottom of the silencer box on one side of the air outlet. The particle catcher comprises a shell and a filter element, and the cross section of the filter element is honeycomb-shaped.

[0016] In the above-mentioned exhaust control device for a blow molding mold, the core-pulling block of the core-pulling structure has a hole diameter of 15 mm and a depth of 15 mm; and the hole diameter of the exhaust channel is 10-15 mm.

[0017] Another object of the present invention is to provide a method for controlling exhaust of a blow mold, comprising the following steps:

[0018] S1. Place the blank: Place the blank in the mold cavity to prepare for blow molding;

[0019] S2, mold closing: the core pulling mechanism extends, so that the core pulling block communicates with the mold cavity;

[0020] S3, Blow molding: The blow molding machine blows high-pressure gas into the air inlet channel to make the blank fit the mold cavity and the product is formed;

[0021] S4, pressure holding: After the product is formed, the pressure is held for a period of time to cool the high-temperature material;

[0022] S5, exhaust: the core pulling mechanism contracts, so that the core pulling block is retracted, the exhaust channel is connected with the mold cavity, and the high-pressure gas in the mold cavity is released to complete the exhaust action;

[0023] S6. The product is cooled and demoulded to complete the blow molding.

[0024] The step S6 further includes S6.1: air is introduced into the air inlet channel, so that airflow is formed from the air inlet channel to the air outlet channel in the mold cavity to accelerate the cooling speed.

[0025] The exhaust channel is blocked by the core-pulling mechanism. On the one hand, it ensures that the pressure does not drop when the product is not formed, thereby improving the product molding efficiency. On the other hand, the core-pulling mechanism opens the exhaust channel only after the product is formed, so that the waste in the molding structure will not enter the exhaust channel and inflate the air inlet channel, thereby achieving the effect of rapid cooling, accelerating the exhaust efficiency, and further improving the product production efficiency.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. The core-pulling mechanism in the blow mold is used as the switch of the exhaust channel, so that the core-pulling structure and the exhaust channel are linked to ensure the pressure-holding effect in the cavity during the mold forming process, so that there will be no leakage during the pressure-holding process, resulting in pressure release, and the pressure-holding effect is improved; after the product is formed, the exhaust channel is opened by the action of the core-pulling mechanism, so that the product can be cooled quickly, so that the product molding effect is good;

[0028] 2. During the pressure holding process, the exhaust channel is opened after the product is formed, so the cooling rate is high and the production efficiency is also fast;

[0029] 3. Maintaining the intake pressure during the exhaust process can discharge the waste in the exhaust channel and use the airflow to speed up the cooling speed;

[0030] 4. A silencer box is also provided to disturb the airflow during exhaust, so that the exhaust noise is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 yes Figure 1 A partial enlarged view of

[0033] Figure 3 It is a structural schematic diagram of the muffler box of the present invention.

[0034] In the figure, 1. mold; 2. core pulling mechanism; 21. core pulling block; 22. molding surface; 3. mold cavity; 4. air inlet channel; 5. exhaust channel; 6. silencer box; 61. silencer baffle; 62. guide plate; 63. particle catcher. DETAILED DESCRIPTION

[0035] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0036] like Figure 1-3 As shown, the exhaust control device of the blow molding mold is provided with a core pulling mechanism 2 on the mold 1, a core pulling block 21 on the core pulling mechanism 2, the core pulling block 21 is communicated with the mold cavity 3, an air inlet channel 4 communicated with the mold cavity 3 is provided on the mold 1, an exhaust channel 5 is provided on the mold 1, the core pulling block 21 is arranged between the mold cavity 3 and the exhaust channel 5, and the core pulling mechanism 2 drives the core pulling block 21 to extend and retract to control the on-off of the exhaust channel 5 and the mold cavity 3. The core pulling mechanism 2 is used as the on-off switch between the exhaust channel 5 and the mold cavity 3 to ensure that the exhaust channel 5 remains in a closed state after the blow molding is completed, and the mold cavity 3 is formed to maintain pressure; after the pressure maintenance is completed, the core pulling mechanism 2 shrinks, and the core pulling block 21 is separated from the mold cavity 3, at this time, the exhaust channel 5 is opened to discharge the hot air in the mold 1; at the same time, the air inlet channel 4 is still filled with gas to form air flow, and the hot air in the mold cavity 3 is discharged to improve the cooling efficiency. The exhaust channel 5 is blocked by the core pulling mechanism 2. On the one hand, it ensures that the pressure does not drop when the product is not formed, thereby improving the product forming efficiency. On the other hand, the core pulling mechanism 2 opens the exhaust channel 5 after the product is formed, and the waste in the forming structure will not enter the exhaust channel 5, and the air inlet channel 4 will be inflated, thereby achieving the effect of rapid cooling, accelerating the exhaust efficiency, and further improving the product production efficiency.

[0037] The core pulling mechanism 2 is a cylinder or an oil cylinder, and one end of the piston rod of the cylinder or the oil cylinder is connected to the core pulling block 21, and the core pulling block 21 is provided with a molding surface 22 at the end away from the piston rod. The core pulling block 21 is close to the mold cavity 3 as the molding surface 22, and also needs to participate in the molding. Under the drive of the oil cylinder or the cylinder, the exhaust channel 5 is closed when it is close to the mold cavity 3; after the molding is completed, the exhaust channel 5 is opened while it is away from the mold cavity 3. One end of the exhaust channel 5 is located inside the mold 1, and the other end is located outside the mold 1. The end of the exhaust channel 5 close to the mold 1 is set on the movement track of the core pulling block 21, and the side of the core pulling block 21 can be against the end of the exhaust channel 5 close to the mold 1. The end of the exhaust channel 5 close to the mold 1 can be abutted by the side of the core pulling block 21, and the opening and closing of the exhaust channel 5 can be realized by the in and out control of the core pulling block 21. The core pulling block 21 of the core pulling structure has an aperture of 15mm and a depth of 15mm; the aperture of the exhaust channel 5 is 10-15mm.

[0038] like Figure 3 As shown: the outside of the mold 1 is also provided with a muffler box 6 which is communicated with the exhaust channel 5. The muffler box 6 includes an air inlet and an air outlet arranged on the other side of the air inlet. The muffler box 6 is also provided with a muffler baffle 61. The muffler baffle 61 forms a muffler cavity inside the muffler box 6. The muffler box 6 performs muffler noise reduction and pollution treatment on the exhaust gas discharged from the exhaust channel 5 to ensure that the final discharged gas is clean and environmentally friendly.

[0039] The silencer baffle 61 includes a top plate arranged at the top of the silencer box 6 and a bottom plate arranged at the bottom of the silencer box 6. A top plate is arranged near the air inlet, the number of the top plates is 3, and the number of the bottom plates is 2. The top plates and the bottom plates are installed alternately to form a serpentine channel. The cooperation of the top plate and the bottom plate, plus the formed serpentine channel, ensures the contact area and residence time of the gas in the silencer box 6, and finally achieves silencing and noise reduction. The air inlet and the air outlet are both arranged at the upper end of the side of the silencer box 6. Due to the characteristics of gas temperature, the density is small when the temperature is high, so it will rise. If the air inlet is set at the lower end, it is difficult to form a downward pressure speed, so the air inlet is set at the upper end; the outlet is also set at the upper end to facilitate the final discharge. Silencing buffer cotton and silencer holes are provided on the bottom plate, and the material of the silencing buffer cotton is polyester fiber.

[0040] A guide plate 62 is also provided at the bottom of the air inlet side of the muffler box 6. The guide plate 62 is L-shaped and the bottom is perpendicular to the muffler baffle 61. The number of the guide plates 62 is 2 and they are parallel to each other. The guide plate 62 guides the flowing gas, and realizes the turning of the gas without causing blockage. A particle catcher 63 is also provided at the bottom of the air outlet side of the muffler box 6. The particle catcher 63 includes a shell and a filter element, and the cross section of the filter element is honeycomb-shaped.

[0041] The method of using the exhaust control device of the blow mold is as follows:

[0042] S1, placing blank: placing blank in mold cavity 3 to prepare for blow molding;

[0043] S2, mold closing: the core pulling mechanism 2 extends, so that the core pulling block 21 communicates with the mold cavity 3;

[0044] S3, blow molding: the blow molding machine blows high-pressure gas into the air inlet channel 4, so that the blank fits the mold cavity 3, and the product is formed;

[0045] S4, pressure holding: After the product is formed, the pressure is held for a period of time to cool the high-temperature material;

[0046] S5, exhaust: the core pulling mechanism 2 contracts, so that the core pulling block 21 is retracted, the exhaust channel 5 is connected with the mold cavity 3, and the high-pressure gas in the mold cavity 3 is released to complete the exhaust action;

[0047] S6. The product is cooled and demoulded to complete the blow molding.

[0048] The step S6 further includes S6.1: air is introduced into the air inlet channel 4, so that airflow is formed from the air inlet channel 4 to the air outlet channel 5 in the mold cavity 3, thereby accelerating the cooling speed.

[0049] In the present invention, the core-pulling mechanism in the blow molding mold is used as the switch of the exhaust channel, so that the core-pulling structure and the exhaust channel are linked to ensure the pressure-holding effect in the cavity during the molding process of the mold, so that there will be no leakage during the pressure-holding process to cause pressure release, and the pressure-holding effect is improved; after the product is formed, the exhaust channel is opened by the action of the core-pulling mechanism, so that the product can be cooled quickly, so that the product molding effect is good; and in the process of pressure holding, the cooling rate is high and the production efficiency is fast when the exhaust channel is opened after the product is formed; the intake pressure is maintained during the exhaust process, the waste in the exhaust channel can be discharged, and the airflow is used to accelerate the cooling speed; in addition, a silencer box is also provided on the outside of the exhaust channel to disturb the airflow during exhaust, so that the exhaust noise is effectively reduced.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An exhaust control device for a blow mold, characterized in that: The mold (1) is provided with a core pulling mechanism (2), the core pulling mechanism (2) is provided with a core pulling block (21), the core pulling block (21) is communicated with the mold cavity (3), the mold (1) is provided with an air inlet channel (4) communicated with the mold cavity (3), the mold (1) is provided with an exhaust channel (5), the core pulling block (21) is arranged between the mold cavity (3) and the exhaust channel (5), and the core pulling mechanism (2) drives the core pulling block (21) to expand and contract to control the opening and closing of the exhaust channel (5) and the mold cavity (3); One end of the exhaust channel (5) is located inside the mold (1), and the other end is located outside the mold (1). The end of the exhaust channel (5) close to the mold (1) is arranged on the movement track of the core pulling block (21), and the side of the core pulling block (21) can be against the end of the exhaust channel (5) close to the mold (1); The outside of the mold (1) is also provided with a silencer box (6) which is in communication with the exhaust channel (5); the silencer box (6) comprises an air inlet and an air outlet arranged on the other side of the air inlet; a silencer baffle (61) is also provided inside the silencer box (6); the silencer baffle (61) forms a silencer cavity inside the silencer box (6).

2. The exhaust control device for a blow mold according to claim 1, characterized in that: The core pulling mechanism (2) is an air cylinder or an oil cylinder, one end of the piston rod of the air cylinder or the oil cylinder is connected to a core pulling block (21), and the end of the core pulling block (21) away from the piston rod is provided with a molding surface (22).

3. The exhaust control device for a blow mold according to claim 1, characterized in that: The silencer baffle (61) comprises a top plate arranged on the top of the silencer box (6) and a bottom plate arranged on the bottom of the silencer box (6). A top plate is arranged near the air inlet. The number of the top plates is 3 and the number of the bottom plates is 2. The top plates and the bottom plates are alternately installed to form a serpentine channel.

4. The exhaust control device for a blow mold according to claim 3, characterized in that: The bottom plate is provided with sound-absorbing buffer cotton and sound-absorbing holes, and the material of the sound-absorbing buffer cotton is polyester fiber.

5. The exhaust control device for a blow mold according to claim 3, characterized in that: A guide plate (62) is also provided at the bottom of the muffler box (6) on one side of the air inlet.

6. The exhaust control device for a blow mold according to claim 3, characterized in that: A particle catcher (63) is also provided at the bottom of the silencer box (6) on one side of the air outlet. The particle catcher (63) comprises a shell and a filter element. The cross section of the filter element is honeycomb-shaped.

7. An exhaust control method for the exhaust control device for a blow mold according to claim 1, characterized in that: The steps include: S1, placing the blank: placing the blank in the mold cavity (3) to prepare for blow molding; S2, mold closing: the core pulling mechanism (2) extends, so that the core pulling block (21) communicates with the mold cavity (3); S3, blow molding: the blow molding machine blows high-pressure gas into the air inlet channel (4) so ​​that the blank fits the mold cavity (3) and the product is formed; S4, pressure holding: After the product is formed, the pressure is held for a period of time to cool the high-temperature material; S5, exhaust: the core pulling mechanism (2) contracts, so that the core pulling block (21) is retracted, the exhaust passage (5) is communicated with the mold cavity (3), and the high-pressure gas in the mold cavity (3) is released, completing the exhaust action; S6. The product is cooled and demoulded to complete the blow molding.

8. The exhaust control method of a blow mold according to claim 7, characterized in that: The step S6 further includes S6.1: air is introduced into the air inlet channel (4) so ​​that an air flow is formed from the air inlet channel (4) to the air outlet channel (5) in the mold cavity (3) to accelerate the cooling speed.

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