Blow molding device for plastic bottle molding and control method thereof

Abstract

The present invention relates to the technical field of blow molding devices, and in particular to a blow molding device for forming plastic bottles and a control method thereof, comprising a blow molding mold and a preheating box, and also comprising: a conveying seat, the conveying seat is connected to a mounting seat, the mounting seat is provided with a threaded opening, the threaded opening is used to install a bottle blank, and a docking port is provided in the middle of the mounting seat; an insertion rod, the surface of the insertion rod is provided with a groove, and the interior of the groove is slidably connected with an air supply component. The present invention switches the opening position of the exhaust component according to the moving direction of the air supply component, and adjusts the airflow direction inside the bottle blank. On the one hand, it is also beneficial to avoid the problem of heat concentration caused by the airflow being always discharged from the same position. On the other hand, as the air supply component moves, it will gradually move away from the opened exhaust component, which is beneficial to prolong the flow path of the airflow in the bottle, thereby ensuring the residence time of the airflow.

Description

Technical Field

[0001] The invention relates to the field of blow molding devices, in particular to a blow molding device for forming plastic bottles and a control method thereof. Background Art

[0002] In the process of blow molding plastic bottles, the preform needs to be preheated first. Usually, the preheating function can be completed by directly heating with air or light from the outside. However, for some special preforms with thick outer walls or double-layer preforms, it is difficult to quickly transfer heat to the inside if the preform is preheated only from the outside. Therefore, in the prior art, the preform is mostly preheated by passing warm air into the inside of the preform.

[0003] However, during the preheating process, the airflow mostly enters from the bottle mouth, circulates inside the bottle, and then flows out from the bottle mouth. In this preheating method, on the one hand, the airflow is too concentrated at the bottle mouth, which may cause the area near the bottle mouth to overheat, while other areas may not have enough temperature; on the other hand, since the blowing position is fixed, the heat near the blowing position is too high, which will also affect the preheating effect. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a blow molding device for plastic bottle molding and a control method thereof.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a blow molding device for forming a plastic bottle, comprising a blow molding mold and a preheating box, and further comprising:

[0006] A conveying seat, the conveying seat is connected to a mounting seat, the mounting seat is provided with a threaded opening, the threaded opening is used to mount the bottle blank, and a docking port is opened in the middle of the mounting seat;

[0007] An insertion rod, a groove is provided on the surface of the insertion rod, an air supply component is slidably connected inside the groove, the air supply component moves up and down on the surface of the insertion rod to blow air, exhaust components are provided at both the upper and lower ends of the groove, and during preheating, the insertion rod is inserted into the docking port;

[0008] A processing terminal, wherein the processing terminal is used to control the opening of the exhaust assembly on the rear side of the moving direction of the air supply assembly when the air supply assembly moves to the middle position of the extension rod;

[0009] Specifically, in the process of blow molding plastic bottles, the preform needs to be preheated first. Usually, the preheating function can be completed by directly heating with air or light from the outside. However, for some special preforms with thick outer walls or double-layer preforms, it is difficult to quickly transfer heat to the inside if the preforms are preheated only from the outside. Therefore, in the prior art, the preforms are mostly preheated by introducing warm air into the inside of the preforms.

[0010] However, during the preheating process, the airflow mostly enters from the bottle mouth, circulates inside the bottle, and then flows out from the bottle mouth. In this preheating method, on the one hand, the airflow is too concentrated at the bottle mouth, which may cause the area near the bottle mouth to be overheated, while other areas may not be hot enough; on the other hand, since the blowing position is fixed, the heat near the blowing position is too high, which will also affect the preheating effect;

[0011] The present invention can solve the above problems. The specific working method is as follows: by setting a threaded port, the bottle blank can be threadedly connected to the mounting seat, and the bottle blank is transported to the inside of the preheating box for preheating through the conveying seat. After the preheating is completed, the bottle blank is transported to the blow molding mold through the conveying seat for blow molding;

[0012] Among them, the preheating box is provided with a lamp heating preheating, and the working methods of the conveying seat and the blow molding mold are all prior art, which will not be described in detail here;

[0013] During the preheating process, the insertion rod is actively inserted into the docking port so that the insertion rod is inserted into the preform. The air supply assembly on the insertion rod delivers warm air to the preform to strengthen the preheating from the inside, which helps to avoid uneven preheating inside and outside the preform.

[0014] Furthermore, in the process of delivering warm air, the air supply position is changed by controlling the air supply assembly to move up and down on the surface of the extension rod, thereby avoiding the situation where heat is concentrated at the air outlet position and affecting the uniformity of preheating;

[0015] Furthermore, when the air supply assembly moves from the middle to the lower part of the extension rod, the top exhaust assembly is opened and the bottom exhaust assembly is closed; when the air supply assembly moves from the middle to the upper part of the extension rod, the top exhaust assembly is closed and the bottom exhaust assembly is opened;

[0016] According to the moving direction of the air supply component, the opening position of the exhaust component is switched to adjust the airflow direction inside the bottle blank. On the one hand, it is also helpful to avoid the problem of heat concentration caused by the airflow always being discharged from the same position. On the other hand, as the air supply component moves, it will gradually move away from the opened exhaust component, which is helpful to extend the flow path of the airflow in the bottle, thereby ensuring the residence time of the airflow;

[0017] It should be noted that the air supply assembly includes an air supply ring, which is slidably sleeved on the surface of the extension rod and located inside the groove. A plurality of connecting pipes are fixed to the bottom of the air supply ring, and the connecting pipes are slidably inserted at the bottom of the groove. The bottom of the connecting pipes penetrates into the extension rod, and an air guide pipe is inserted inside the connecting pipe. The top of the air guide pipe is connected to the nozzle on the air supply ring, and the bottom of the air guide pipe is connected to an air pump.

[0018] The surface of the connecting pipe is threadedly connected with a threaded sleeve, the threaded sleeve is rotatably connected to the inside of the extending rod, and the threaded sleeve is driven to rotate by a motor and a gear set;

[0019] By starting the motor, the threaded sleeve can be driven to rotate, thereby driving the connecting pipe to move up and down, thereby driving the air supply ring to move up and down;

[0020] A connecting strip is fixed to the bottom of the multiple insertion rods, and an electric push rod is fixed to the bottom of the connecting strip. When the bottle blank moves into the preheating box, the electric push rod is started to push the connecting strip upward, thereby driving the insertion rod to be inserted into the docking port.

[0021] Preferably, the exhaust assembly comprises:

[0022] A plurality of exhaust grooves, which are provided on the upper and lower side walls of the extension rod and are distributed on the surface of the extension rod in a circular array;

[0023] An exhaust cavity, the exhaust cavity is arranged inside the extending rod, and the exhaust cavity is used to connect all the exhaust grooves;

[0024] A sliding ring, wherein the sliding ring is slidably arranged inside the exhaust groove, and an electrically controlled exhaust valve is installed on the inner ring surface of the sliding ring;

[0025] An air relief groove, which is disposed at the rear end of the exhaust groove and is communicated with the exhaust cavity;

[0026] A connecting rod, the connecting rod is fixed on the back side of the sliding ring, a mounting plate is provided on the sliding sleeve outside the connecting rod, the mounting plate is fixed on the inner wall of the air relief groove, a second spring is provided between the mounting plate and the sliding ring, and a limit block is fixed on the end of the connecting rod after passing through the mounting plate, and a first guiding surface is provided on the limit block;

[0027] Two limit assemblies are respectively arranged at the upper and lower ends of the extension rod. When the electric-controlled exhaust valve is closed, the limit assembly at the corresponding end contacts the first guide surface to limit the sliding ring from sliding into the exhaust groove.

[0028] Specifically, under normal circumstances, when the electric-controlled exhaust valve is opened, the airflow inside the preform can enter from the position of the electric-controlled exhaust valve and be discharged along the exhaust cavity;

[0029] However, when the electronically controlled exhaust valve fails, if the gas inside the preform cannot be discharged for a long time, the preform will bulge and be damaged.

[0030] The present invention provides a sliding ring, which can automatically move into the air relief groove to make way under the action of air pressure when the electric-controlled exhaust valve fails, so that the exhaust groove is connected with the exhaust cavity through the air relief groove, thereby ensuring the exhaust of the gas inside the bottle blank and avoiding the damage of the bottle blank.

[0031] Furthermore, by setting a limit assembly, the movement of the sliding ring of the closed electrically controlled exhaust slot is limited, thereby preventing the exhaust slots at both ends from being opened, resulting in a change in the direction of the airflow.

[0032] In a second aspect, the present invention provides a control method for a blow molding device for forming a plastic bottle, the control method comprising the following steps:

[0033] A1. Obtaining a first distance parameter between a target position and a trigger position of an air supply component;

[0034] A2. Compare the first distance parameter with the set distance parameter;

[0035] A3. When the first distance parameter is greater than the set distance parameter and the air supply component reaches the trigger position, a switching instruction is generated;

[0036] A4. Switch the opening and closing states of the exhaust components according to the switching instructions;

[0037] In general, when the air supply component moves upward, the target position is the top position of the groove, and when the air supply component moves downward, the target position is the bottom position of the groove;

[0038] However, when the shape of the preform is that there is an outward protrusion in the middle, the air supply assembly may need to move back and forth a short distance in the middle of the groove to ensure uniform heating of the middle of the preform.

[0039] There are also some situations that may cause the air supply component to move at different distances. For example, the material of some preforms may be thicker at the bottom and thinner at the top, which causes the air supply component to heat the bottom for a longer time. Therefore, it often does not need to move to the top or bottom and needs to return.

[0040] Furthermore, the trigger position is set in the middle of the groove. By obtaining the distance between the target position and the trigger position in advance, when the distance is less than or equal to the set value, it means that the air supply component needs to return immediately after passing the middle position, i.e., the trigger position. In this case, after switching the opening and closing state of the exhaust component, it needs to be switched back in a short time. Therefore, there is no need to frequently switch the opening and closing state of the exhaust component.

[0041] When the distance is greater than the set value, a switching instruction is generated to switch the opening state of the two exhaust components, which is beneficial to increase the residence time of the airflow inside the bottle blank and ensure the preheating efficiency.

[0042] Preferably, the specific steps of step A3 include:

[0043] Acquire trigger information that the air supply component reaches the trigger position and movement direction information of the air supply component;

[0044] Determine the switching instructions for the opening and closing states of the two exhaust components according to the trigger information of the air supply component reaching the trigger position and the movement direction information of the air supply component, when the movement direction information of the air supply component is downward, the switching instruction is the first switching instruction, and when the movement direction information of the air supply component is upward, the switching instruction is the second switching instruction;

[0045] Among them, when the air supply component reaches the trigger position, the exhaust component on its rear side can be controlled to open according to the movement direction information of the air supply component, thereby ensuring that the distance between the opened exhaust component and the air supply component is gradually increased, which is beneficial to increase the residence time of the airflow inside the bottle blank and ensure the preheating efficiency.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. In the process of delivering warm air, the present invention controls the air supply assembly to move up and down on the surface of the extension rod to change the air supply position, thereby avoiding the situation where heat is concentrated at the air outlet position and affecting the uniformity of preheating.

[0048] Second, according to the moving direction of the air supply component, switch the opening position of the exhaust component and adjust the airflow direction inside the bottle blank. On the one hand, it is also helpful to avoid the problem of heat concentration caused by the airflow always being discharged from the same position. On the other hand, as the air supply component moves, it will gradually move away from the opened exhaust component, which is helpful to extend the flow path of the airflow in the bottle and ensure the residence time of the airflow.

[0049] 3. The present invention provides a sliding ring, which can automatically move into the air relief groove to make way under the action of air pressure when the electric-controlled exhaust valve fails, so that the exhaust groove is connected with the exhaust cavity through the air relief groove, thereby ensuring the discharge of gas inside the bottle blank and avoiding damage to the bottle blank.

[0050] Fourth, by setting a limit assembly, the movement of the sliding ring of the closed electric control exhaust slot is limited, so as to avoid the exhaust slots at both ends of the upper and lower ends being opened, resulting in a change in the direction of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0052] Figure 2 This is a schematic diagram of the overall structure of the present invention after the preheating box is hidden.

[0053] Figure 3 For the present invention Figure 2 A in the figure is an enlarged structural diagram.

[0054] Figure 4 It is a schematic diagram of the cross-sectional structure of the bottle blank of the present invention.

[0055] Figure 5 The cross-sectional structure of the insertion rod of the present invention is shown in FIG. Figure 1 .

[0056] Figure 6 The cross-sectional structure of the insertion rod of the present invention is shown in FIG. Figure 2 .

[0057] Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in FIG.

[0058] Figure 8 For the present invention Figure 6 The enlarged structural diagram at C in the figure.

[0059] Fig. 9 It is a schematic diagram of the structure of the conveying seat and the mounting seat of the present invention.

[0060] Fig.10 It is a flow chart of the control method of the present invention.

[0061] In the figure: 1. blow mold; 2. preheating box; 3. conveying seat; 4. mounting seat; 5. docking port; 6. insertion rod; 7. groove; 8. air supply ring; 9. connecting pipe; 10. air guide pipe; 11. air pump; 12. threaded sleeve; 13. mounting groove; 14. pressure sensor; 15. trigger pin; 16. first spring; 17. exhaust groove; 18. exhaust cavity; 19. sliding ring; 20. electric exhaust valve; 21. air release groove; 22. connecting rod; 23. mounting plate; 24. second spring; 25. limit block; 26. push ring; 27. electric cylinder; 28. limit plate; 29. ​​first gear; 30. second gear; 31. motor; 32. preform; 33. connecting strip; 34. electric push rod. DETAILED DESCRIPTION

[0062] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0063] like Figures 1 to 9 The blow molding device for forming a plastic bottle shown in the figure comprises a blow molding mold 1 and a preheating box 2, and also comprises:

[0064] A conveying seat 3, the conveying seat 3 is connected to a mounting seat 4, a threaded opening is provided on the mounting seat 4, the threaded opening is used to install the bottle blank 32, and a docking port 5 is opened in the middle of the mounting seat 4;

[0065] The insertion rod 6 has a groove 7 on its surface, and an air supply component is slidably connected inside the groove 7. The air supply component moves up and down on the surface of the insertion rod 6 to blow air. Exhaust components are provided at both ends of the groove 7. When preheating, the insertion rod 6 is inserted into the docking port 5.

[0066] The processing terminal is used to control the opening of the exhaust assembly on the rear side of the moving direction of the air supply assembly when the air supply assembly moves to the middle position of the extension rod 6;

[0067] Specifically, in the process of blow molding the plastic bottle, the preform 32 needs to be preheated first. Usually, the preheating function can be completed by directly heating with air or light from the outside. However, for some special preforms 32 with thick outer walls or double-layer preforms 32, it is difficult to quickly transfer heat to the inside if the preforms 32 are preheated only from the outside. Therefore, in the prior art, the preforms 32 are mostly preheated by passing warm air into them.

[0068] However, during the preheating process, the airflow mostly enters from the bottle mouth, circulates inside the bottle, and then flows out from the bottle mouth. In this preheating method, on the one hand, the airflow is too concentrated at the bottle mouth, which may cause the area near the bottle mouth to be overheated, while other areas may not be hot enough; on the other hand, since the blowing position is fixed, the heat near the blowing position is too high, which will also affect the preheating effect;

[0069] The present invention can solve the above problems. The specific working method is as follows: by setting a threaded port, the bottle blank 32 can be threadedly connected to the mounting seat 4, and the bottle blank 32 is conveyed to the inside of the preheating box 2 for preheating through the conveying seat 3. After the preheating is completed, the bottle blank 32 is conveyed to the blow molding mold 1 through the conveying seat 3 for blow molding;

[0070] Among them, the preheating box 2 is provided with a lamp-heated preheating, and the working methods of the conveying seat 3 and the blow molding mold 1 are all prior arts, which will not be described in detail here;

[0071] During the preheating process, the insertion rod 6 is actively inserted into the docking port 5 so that the insertion rod 6 is inserted into the bottle blank 32. The air supply assembly on the insertion rod 6 delivers warm air to the inside of the bottle blank 32 to strengthen the preheating from the inside, which is beneficial to avoid uneven preheating inside and outside the bottle blank 32.

[0072] Furthermore, in the process of delivering warm air, the air supply position is changed by controlling the air supply component to move up and down on the surface of the extension rod 6, thereby avoiding the situation where heat is concentrated at the air outlet position of the air supply component and affecting the uniformity of preheating;

[0073] Furthermore, when the air supply assembly moves from the middle to the lower half of the extension rod 6, the top exhaust assembly is opened and the bottom exhaust assembly is closed; when the air supply assembly moves from the middle to the upper half of the extension rod 6, the top exhaust assembly is closed and the bottom exhaust assembly is opened;

[0074] According to the moving direction of the air supply component, the opening position of the exhaust component is switched to adjust the airflow direction inside the bottle blank 32. On the one hand, it is also helpful to avoid the problem of heat concentration caused by the airflow always being discharged from the same position. On the other hand, as the air supply component moves, it will gradually move away from the opened exhaust component, which is helpful to extend the flow path of the airflow in the bottle, thereby ensuring the residence time of the airflow;

[0075] It should be noted that the air supply assembly includes an air supply ring 8, which is slidably sleeved on the surface of the insertion rod 6 and is located inside the groove 7. A plurality of connecting pipes 9 are fixed to the bottom of the air supply ring 8. The connecting pipes 9 are slidably inserted at the bottom of the groove 7. The bottom of the connecting pipes 9 penetrates into the insertion rod 6. An air guide pipe 10 is inserted inside the connecting pipe 9. The top of the air guide pipe 10 is connected to the nozzle on the air supply ring 8. The bottom of the air guide pipe 10 is connected to an air pump 11.

[0076] The surface of the connecting pipe 9 is threadedly connected with a threaded sleeve 12, which is rotatably connected to the inside of the extending rod 6, and the threaded sleeve 12 is driven to rotate by a motor and a gear set;

[0077] By starting the motor, the threaded sleeve 12 can be driven to rotate, thereby driving the connecting pipe 9 to move up and down, thereby driving the air supply ring 8 to move up and down;

[0078] A connecting strip 33 is fixed to the bottom of the plurality of insertion rods 6, and an electric push rod 34 is fixed to the bottom of the connecting strip 33. When the preform 32 moves into the preheating box 2, the electric push rod 34 is started to push the connecting strip 33 upward, thereby driving the insertion rod 6 to be inserted into the docking port 5.

[0079] As a further embodiment of the present invention, a trigger assembly is provided in the middle of the extension rod 6, and the trigger assembly comprises:

[0080] A mounting groove 13, the mounting groove 13 is provided in the middle of the extending rod 6;

[0081] A pressure sensor 14, the pressure sensor 14 is fixed inside the mounting groove 13;

[0082] A trigger pin 15, which is slidably inserted into the mounting groove 13, and a first spring 16 is fixed between the trigger pin 15 and the pressure sensor 14;

[0083] Specifically, the end of the trigger pin 15 is in an extended state, and the end of the trigger pin 15 is provided with an arc surface. Each time the air supply component passes through the middle position of the extension rod 6, the trigger pin 15 will be pressed, so that the trigger pin 15 compresses the first spring 16. After the pressure sensor 14 detects that the pressure value of the first spring 16 increases, it is determined that the air supply component has passed the middle and the trigger function is completed.

[0084] As a further embodiment of the present invention, the exhaust assembly comprises:

[0085] A plurality of exhaust grooves 17, which are provided on the upper and lower side walls of the extending rod 6 and are distributed in a circular array on the surface of the extending rod 6;

[0086] An exhaust cavity 18, which is arranged inside the extending rod 6, and is used to connect all the exhaust grooves 17;

[0087] A sliding ring 19, the sliding ring 19 is slidably arranged inside the exhaust groove 17, and an electric-controlled exhaust valve 20 is installed on the inner ring surface of the sliding ring 19;

[0088] An air relief groove 21, which is disposed at the rear end of the exhaust groove 17 and communicates with the exhaust cavity 18;

[0089] A connecting rod 22, the connecting rod 22 is fixed on the back side of the sliding ring 19, a mounting plate 23 is provided on the outer sliding sleeve of the connecting rod 22, the mounting plate 23 is fixed on the inner wall of the air relief groove 21, a second spring 24 is provided between the mounting plate 23 and the sliding ring 19, and the end of the connecting rod 22 passes through the mounting plate 23 and is fixed with a limiting block 25, and a first guiding surface is provided on the limiting block 25;

[0090] Two limit assemblies are respectively arranged at the upper and lower ends of the extending rod 6. When the electric-controlled exhaust valve 20 is closed, the limit assembly at one end contacts the first guide surface to limit the sliding ring 19 from sliding into the exhaust groove 21.

[0091] Specifically, the electrically controlled exhaust valve 20 may be a solenoid valve;

[0092] By setting the electrically controlled exhaust valve 20, the opening and closing state of the electrically controlled exhaust valve 20 can be adjusted by the electrically controlled system, thereby adapting to the above-mentioned implementation method of switching the opening position of the exhaust component according to the moving direction of the air supply component to extend the residence time of the airflow in the bottle blank 32;

[0093] Under normal circumstances, when the electric-controlled exhaust valve 20 is opened, the airflow inside the bottle blank 32 can enter from the position of the electric-controlled exhaust valve 20 and flow along the exhaust cavity 18, and be discharged from the opening of the exhaust cavity 18 set at the bottom of the extending rod 6;

[0094] However, when the electronically controlled exhaust valve 20 fails, if the gas inside the bottle blank 32 cannot be exhausted for a long time, the bottle blank 32 may swell and be damaged.

[0095] The present invention provides a sliding ring 19, and when the electric-controlled exhaust valve 20 fails, it can automatically move into the exhaust groove 21 to make way under the action of air pressure, so that the exhaust groove 17 is connected with the exhaust cavity 18 through the exhaust groove 21, thereby ensuring the exhaust of the gas inside the bottle blank 32 and avoiding damage to the bottle blank 32;

[0096] Furthermore, by providing a limit assembly, the movement of the sliding ring 19 of the closed electrically controlled exhaust valve 20 is limited, thereby preventing the exhaust grooves 17 at both ends from being opened, resulting in a change in the direction of the airflow.

[0097] As a further embodiment of the present invention, the limiting component includes:

[0098] A push ring 26, which is slidably disposed on the inner wall of the exhaust chamber 18;

[0099] The electric cylinder 27, the movable end of the electric cylinder 27 is fixed to the push ring 26, and the fixed end of the electric cylinder 27 is fixed to the inner wall of the exhaust chamber 18;

[0100] The limiting plate 28, the limiting plate 28 is fixed to the surface of the push ring 26, the surface of the limiting plate 28 is provided with a second guide surface;

[0101] Specifically, usually, only one of the exhaust components at the top and bottom is in an open state, and the limit assembly can limit the movement of the sliding ring 19 on the exhaust component in the unopened state;

[0102] When the electric cylinder 27 extends, the push ring 26 and the limit plate 28 can be pushed to contact the limit block 25, specifically, the second guide surface contacts the first guide surface, thereby blocking and limiting the limit block 25, and limiting the sliding ring 19 from entering the inside of the air release groove 21;

[0103] When the electric cylinder 27 contracts, it can pull the push ring 26 and the limit plate 28 away from the limit block 25, so that the sliding ring 19 can slide into the air release groove 21 under the push of air pressure.

[0104] As a further embodiment of the present invention, the mounting seat 4 is rotatably connected to the surface of the conveying seat 3, a first gear 29 is fixed on the surface of the mounting seat 4, a second gear 30 is fixed on the conveying seat 3, the second gear 30 is meshed with the first gear 29, a motor 31 is fixed on the conveying seat 3, and an output shaft of the motor 31 is fixed to the second gear 30;

[0105] Specifically, the second gear 30 is driven to rotate by starting the motor 31, and the first gear 29 is driven to rotate by the second gear 30, thereby driving the mounting base 4 to rotate as a whole, and the bottle blank 32 above it is driven to rotate by the rotation of the mounting base 4, so that the bottle blank 32 can be evenly heated.

[0106] like Fig.10 A control method for a blow molding device for forming a plastic bottle is shown, the control method comprising the following steps:

[0107] A1. Obtaining a first distance parameter between a target position and a trigger position of an air supply component;

[0108] A2. Compare the first distance parameter with the set distance parameter;

[0109] A3. When the first distance parameter is greater than the set distance parameter and the air supply component reaches the trigger position, a switching instruction is generated;

[0110] A4. Switch the opening and closing states of the exhaust components according to the switching instructions;

[0111] In general, when the air supply assembly moves upward, the target position is the top position of the groove 7, and when the air supply assembly moves downward, the target position is the bottom position of the groove 7;

[0112] However, when the shape of the bottle blank 32 is that there is an outward protrusion in the middle, it may be necessary for the air supply assembly to move back and forth a short distance in the middle position of the groove 7 to ensure uniform heating of the middle position of the bottle blank 32;

[0113] There are also some situations that may cause the moving distance of the air supply component to be different. For example, the material of some preforms 32 may be thicker at the bottom and thinner at the top, which causes the air supply component to heat the bottom for a longer time. Therefore, it is often not necessary to move to the top or the bottom, but to return. At this time, the target position is the middle position of the groove 7.

[0114] Furthermore, the trigger position is set in the middle of the groove 7. By obtaining the distance between the target position and the trigger position in advance, when the distance (first distance parameter) is less than or equal to the set value (set distance parameter), it means that the air supply component needs to return immediately after passing the middle position, i.e., the trigger position. In this case, after switching the opening and closing state of the exhaust component, it needs to be switched back in a short time. Therefore, there is no need to frequently switch the opening and closing state of the exhaust component.

[0115] When the distance is greater than the set value, a switching instruction is generated to switch the opening states of the two exhaust components, which is beneficial to increase the residence time of the airflow inside the bottle blank 32 and ensure the preheating efficiency.

[0116] As a further embodiment of the present invention, the specific steps of step A3 include:

[0117] Acquire trigger information that the air supply component reaches the trigger position and movement direction information of the air supply component;

[0118] Determine the switching instructions for the opening and closing states of the two exhaust components according to the trigger information of the air supply component reaching the trigger position and the movement direction information of the air supply component, when the movement direction information of the air supply component is downward, the switching instruction is the first switching instruction, and when the movement direction information of the air supply component is upward, the switching instruction is the second switching instruction;

[0119] Among them, when the air supply component reaches the trigger position, the exhaust component on its rear side can be controlled to open according to the movement direction information of the air supply component, thereby ensuring that the distance between the opened exhaust component and the air supply component is gradually increased, which is beneficial to increase the residence time of the airflow inside the bottle blank 32 and ensure the preheating efficiency.

[0120] As a further embodiment of the present invention, the first switching instruction is to control the upper exhaust assembly to be opened and the lower exhaust assembly to be closed;

[0121] The second switching instruction is to control the upper exhaust component to close and the lower exhaust component to open.

[0122] As a further embodiment of the present invention, the subsequent steps of step A4 further include:

[0123] A5. When the first distance parameter is less than or equal to the set distance parameter, obtain the moving speed parameter of the air supply component;

[0124] A6. When the moving speed parameter is less than the set speed parameter, an opening instruction is generated, and the opening instruction is used to open the closed exhaust component;

[0125] Among them, when the distance is less than or equal to the set value, the air supply component needs to return immediately after passing the middle position, i.e. the trigger position. In this case, there is no need to frequently switch the opening and closing state of the exhaust component;

[0126] However, when the return speed is slow, the exhaust component may be opened for too long, resulting in a problem of rapid temperature rise around it. Therefore, the present invention obtains the moving speed of the air supply component, and when the speed (moving speed parameter) is less than the set speed (set speed parameter), the other exhaust component is also opened, and the two exhaust components are used to exhaust air synchronously, which is conducive to reducing the pressure of temperature rise around the exhaust component;

[0127] The moving speed of the air supply assembly can be determined by detecting the rotation speed of the motor of the air supply assembly.

[0128] As a further embodiment of the present invention, the subsequent steps of step A6 also include:

[0129] A7. Obtaining the jet state information of the air supply component;

[0130] A8. When the jet state information is concentrated jet information, the moving state of the air supply component is adjusted to an intermittent moving state according to the concentrated jet information;

[0131] When it is detected that the air jet state of the air supply component is a concentrated air jet state, the airflow is relatively concentrated, which will cause the contact area to be reduced, thereby making it difficult for the airflow to evenly cover the surface of the preform 32;

[0132] Therefore, by controlling the moving state of the air supply assembly to be an intermittent moving state, the uniform coverage of the airflow is ensured in coordination with the rotation of the bottle blank 32;

[0133] Specifically, the air supply assembly may be arranged to stop moving after rising a short distance each time, and at this time, in coordination with the rotation of the preform 32, the air flow can evenly contact various positions of the horizontal plane of the preform 32;

[0134] After staying for a certain period of time, the air supply component is controlled to rise a short distance, and this process is repeated to achieve uniform preheating.

[0135] Furthermore, after a period of preheating, the inner wall of the preform 32 has softened. At this time, there is no need for the airflow to blow directly to the preform 32. The jet state is adjusted to dispersed jet, and the jet is blown to the inside of the preform 32 to ensure the temperature inside the preform 32. At this time, the contact area is large. Therefore, when the jet state is detected to be dispersed jet, no unnecessary operation is required.

[0136] Among them, by installing a nozzle with adjustable jet state on the air supply component, the jet state can be adjusted to be dispersed or concentrated. This is a prior art and will not be described in detail here.

[0137] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A blow molding device for forming a plastic bottle, comprising a blow molding mold (1) and a preheating box (2), characterized in that: Also includes: A conveying seat (3), the conveying seat (3) being connected to a mounting seat (4), the mounting seat (4) being provided with a threaded opening, the threaded opening being used for mounting a bottle blank (32), and a docking port (5) being provided in the middle of the mounting seat (4); An insertion rod (6), a groove (7) is provided on the surface of the insertion rod (6), an air supply component is slidably connected inside the groove (7), the air supply component moves up and down on the surface of the insertion rod (6) to blow air, and exhaust components are provided at both upper and lower ends of the groove (7). During preheating, the insertion rod (6) is inserted into the interior of the docking port (5); A processing terminal, the processing terminal is used to control the opening of the exhaust assembly on the rear side of the moving direction of the air supply assembly when the air supply assembly moves to the middle position of the extension rod (6); A trigger assembly is provided in the middle of the insertion rod (6), and the trigger assembly comprises: A mounting groove (13), wherein the mounting groove (13) is formed in the middle of the extension rod (6); A pressure sensor (14), wherein the pressure sensor (14) is fixed inside the mounting groove (13); A trigger pin (15), the trigger pin (15) being slidably inserted into the interior of the mounting groove (13), and a first spring (16) being fixed between the trigger pin (15) and the pressure sensor (14); The exhaust assembly comprises: A plurality of exhaust grooves (17), wherein the exhaust grooves (17) are formed on the upper and lower side walls of the insertion rod (6) and are distributed in a circular array on the surface of the insertion rod (6); An exhaust cavity (18), the exhaust cavity (18) being arranged inside the extension rod (6), the exhaust cavity (18) being used to connect all the exhaust grooves (17); A sliding ring (19), the sliding ring (19) being slidably disposed inside the exhaust groove (17), and an electrically controlled exhaust valve (20) being mounted on the inner ring surface of the sliding ring (19); An air relief groove (21), wherein the air relief groove (21) is disposed at the rear end of the exhaust groove (17) and is in communication with the exhaust cavity (18); a connecting rod (22), the connecting rod (22) being fixed on the back side of the sliding ring (19), a mounting plate (23) being provided on the outer sliding sleeve of the connecting rod (22), the mounting plate (23) being fixed on the inner wall of the air relief groove (21), a second spring (24) being provided between the mounting plate (23) and the sliding ring (19), the end of the connecting rod (22) passing through the mounting plate (23) and being fixed on a limiting block (25), the limiting block (25) being provided with a first guide surface; Two limit assemblies are respectively arranged at the upper and lower ends of the extension rod (6); when the electrically controlled exhaust valve (20) is closed, the limit assembly at the corresponding end contacts the first guide surface, limiting the sliding ring (19) from sliding into the exhaust groove (21).

2. A blow molding device for forming a plastic bottle according to claim 1, characterized in that: The limiting component comprises: a push ring (26), the push ring (26) being slidably disposed on the inner wall of the exhaust chamber (18); An electric cylinder (27), wherein a movable end of the electric cylinder (27) is fixed to the push ring (26), and a fixed end of the electric cylinder (27) is fixed to the inner wall of the exhaust chamber (18); A limit plate (28), wherein the limit plate (28) is fixed on the surface of the push ring (26), and a second guide surface is provided on the surface of the limit plate (28).

3. A blow molding device for forming a plastic bottle according to claim 2, characterized in that: The mounting seat (4) is rotatably connected to the surface of the conveying seat (3); a first gear (29) is fixed on the surface of the mounting seat (4); a second gear (30) is fixed on the conveying seat (3); the second gear (30) is meshed with the first gear (29); a motor (31) is fixed on the conveying seat (3); an output shaft of the motor (31) is fixed to the second gear (30).

4. A control method for a blow molding device for forming a plastic bottle, applicable to a blow molding device for forming a plastic bottle as claimed in claim 3, characterized in that: The control method comprises the following steps: A1. Obtaining a first distance parameter between a target position and a trigger position of an air supply component; A2. Compare the first distance parameter with the set distance parameter; A3. When the first distance parameter is greater than the set distance parameter and the air supply component reaches the trigger position, a switching instruction is generated; A4. Switch the opening and closing status of the exhaust component according to the switching instruction.

5. A control method for a blow molding device for forming a plastic bottle according to claim 4, characterized in that: The specific steps of step A3 include: Acquire trigger information that the air supply component reaches the trigger position and movement direction information of the air supply component; The switching instructions for the opening and closing states of the two exhaust components are determined based on the trigger information of the air supply component reaching the trigger position and the movement direction information of the air supply component. When the movement direction information of the air supply component is downward, the switching instruction is the first switching instruction. When the movement direction information of the air supply component is upward, the switching instruction is the second switching instruction.

6. A control method for a blow molding device for forming a plastic bottle according to claim 5, characterized in that: The first switching instruction is to control the upper exhaust component to be opened and the lower exhaust component to be closed; The second switching instruction is to control the upper exhaust component to close and the lower exhaust component to open.

7. A control method for a blow molding device for forming a plastic bottle according to claim 5, characterized in that: The subsequent steps of step A4 also include: A5. When the first distance parameter is less than or equal to the set distance parameter, obtain the moving speed parameter of the air supply component; A6. When the moving speed parameter is less than the set speed parameter, an opening instruction is generated, and the opening instruction is used to open the closed exhaust component.

8. A control method for a blow molding device for forming a plastic bottle according to claim 7, characterized in that: The subsequent steps of step A6 also include: A7. Obtaining the jet state information of the air supply component; A8. When the jet state information is concentrated jet information, the moving state of the air supply component is adjusted to an intermittent moving state according to the concentrated jet information.

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