A post-mold handle device for bottle blowing molds
Patent Information
- Application Number
- CN202522270485.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-10-27
AI Technical Summary
In the existing technology, blow molding molds with handles after molding are difficult to demold smoothly, and the mechanical drive structure occupies a large space, making it difficult to miniaturize and lighten the mold.
The insert block device, which is controlled by air pressure, supplies or exhausts air to or from different spaces through the first and second flow channels, respectively, to drive the insert blocks to move towards or away from each other, thereby achieving precise positioning and demolding. The insert blocks are built into the mold, reducing the external space occupied.
It achieves a compact mold design, reduces manufacturing costs, improves demolding accuracy and production efficiency, and meets the needs of mold miniaturization and lightweighting.
Smart Images
Figure CN224928487U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of blow molding technology, and in particular to a rear handle device for blow molding molds. Background Technology
[0002] In blow molding, many hollow plastic bottles need to be equipped with handles for easy carrying or pouring. A common method is to install handles after the bottle is placed, relying on pre-formed slots or holes on the preform for a secure connection. However, when using fixed insert-type molded slots, the preform is difficult to eject smoothly along the mold opening direction after blow molding due to the inverted structure. Forced demolding can easily damage or deform the preform. On the other hand, methods that use mechanical movement to remove the molding block require a large mechanical drive structure, which is not conducive to miniaturization and lightweight mold design. Utility Model Content
[0003] The technical problem to be solved by this utility model is to solve at least one of the technical problems mentioned above.
[0004] The solution to the technical problem of this utility model is: a rear handle device for a blow molding die, comprising a handle mold, a first flow channel, a second flow channel, two clearance grooves, and two insert blocks. The handle mold has a horizontally extending movable cavity. The two clearance grooves are symmetrically arranged on the top surface of the handle mold, connecting the movable cavity to the external space. One end of each of the two insert blocks is slidably connected to the inner wall of the movable cavity, and the other end of each insert block passes through the two clearance grooves and is used to abut against the inner wall of the preform during blow molding to position the inner side of the handle. The groove; the two embedded blocks divide the moving cavity into a first space located between the two embedded blocks, and a second space and a third space located on the side of the two embedded blocks opposite to the first space; the first flow channel and the second flow channel are disposed inside the handle mold, the first flow channel connects the first space with the external space, and the second flow channel connects the external space with both the second space and the third space; the first flow channel is used to supply air to or exhaust air from the first space, and the second flow channel is used to supply air to or exhaust air from both the second space and the third space simultaneously, so as to drive the two embedded blocks to move towards or away from each other.
[0005] As a further improvement to the above technical solution, each of the embedded blocks includes a slider, an embedded block body and a pulley. The embedded block body is detachably mounted on the slider. The pulley is disposed on one end of the embedded block body near the clearance groove and can rotate relative to the embedded block body. The handle mold is provided with a slide rail that cooperates with the pulley.
[0006] As a further improvement to the above technical solution, the insert body is provided with a threaded hole, the slider is provided with a mounting hole that mates with the threaded hole, the insert body is detachably fixed to the slider by bolts, the bottom of the handle mold is provided with a guide groove that mates with the bolts, the guide groove connects the moving cavity with the external space, the extension direction of the guide groove is parallel to the axial direction of the moving cavity, and the shank of the bolt passes through the guide groove and can slide along the extension direction of the guide groove.
[0007] As a further improvement to the above technical solution, each of the embedded blocks further includes two sealing rings, which are respectively fixed on the outer peripheral walls at both ends of the slider, and the outer walls of the sealing rings abut against the inner wall of the moving cavity.
[0008] As a further improvement to the above technical solution, it also includes two end caps, which are respectively disposed at both ends of the movable cavity to close the ends of the movable cavity, and the two end caps respectively constitute the end walls of the second space or the third space.
[0009] As a further improvement to the above technical solution, a cooling channel is also provided inside the handle mold, and an inlet and an outlet connected to the cooling channel are provided on the handle mold.
[0010] As a further improvement to the above technical solution, an auxiliary mold is also included. The auxiliary mold is detachably disposed on the top of the handle mold. The auxiliary mold has a profile that matches the expected shape of the bottle handle. The auxiliary mold has a guide hole. The axial direction of the guide hole is parallel to the axial direction of the moving cavity. The end of the insert block away from the handle mold passes through the guide hole. The insert block is slidably connected to the guide hole.
[0011] The beneficial effects of this utility model are as follows: the handle mold is used to form the shape of the handle; the moving cavity provides a moving track and space for the two embedded blocks, enabling them to move towards or away from each other within the cavity; the clearance groove provides a channel and space for the vertical part of the embedded block to move along the axial direction of the moving cavity, ensuring smooth movement of the embedded block; one end of the embedded block passes through the clearance groove and abuts against the preform during blow molding to form the positioning groove on the inner side of the handle, while the other end acts as a piston, capable of sensing changes in air pressure and driving the overall movement; the first flow channel and the second flow channel are connected to an external air source, controlling the air pressure difference between the first space, the second space, and the third space by supplying or venting air to different spaces, thereby providing the embedded blocks with the power to move towards or away from each other. By controlling the movement of the insert blocks in opposite directions using air pressure, precise positioning during blow molding and avoidance during demolding are achieved, solving the demolding problem of rear-handle molds; the drive system is built into the mold plate, saving space on the outside and around the mold, making the mold structure more compact and easy to achieve miniaturization and lightweight design; the air pressure system has a simple structure and the component cost is lower than that of precision mechanical drive systems, reducing the manufacturing cost of the mold. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of one embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the present invention; Figure 3 This is a cross-sectional view of one embodiment of the present invention.
[0013] Reference numerals in the attached drawings: 100-Handle mold, 110-First flow channel, 120-Second flow channel, 130-Allowing groove, 140-Moving cavity, 141-First space, 142-Second space, 143-Third space, 150-Slide rail, 160-Guide groove, 200-Embedded block, 210-Slider, 211-Mounting hole, 220-Embedded block body, 221-Threaded hole, 230-Pulley, 240-Sealing ring, 300-End cap, 410-Inlet, 420-Outlet, 500-Auxiliary mold, 510-Guide hole. Detailed Implementation
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments have been briefly explained above. Obviously, the described drawings are only a part of the embodiments of this utility model, not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.
[0015] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. Furthermore, all connections / linkages mentioned herein do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this utility model can be combined interactively without contradicting each other.
[0016] In blow molding, many hollow plastic bottles need to be equipped with handles for easy carrying or pouring. A common method is to install handles after the bottle is placed, relying on pre-formed slots or holes on the preform for a secure connection. However, when using fixed insert-type molded slots, the preform is difficult to eject smoothly along the mold opening direction after blow molding due to the inverted structure. Forced demolding can easily damage or deform the preform. On the other hand, methods that use mechanical movement to remove the molding block require a large mechanical drive structure, which is not conducive to miniaturization and lightweight mold design.
[0017] Therefore, this utility model proposes a rear handle device for blow molding molds, referring to... Figures 1-3 The device includes a handle mold 100, a first flow channel 110, a second flow channel 120, two clearance grooves 130, and two insert blocks 200. The handle mold 100 has a horizontally extending movable cavity 140. The two clearance grooves 130 are symmetrically arranged on the top surface of the handle mold 100, connecting the movable cavity 140 to the external space. One end of each insert block 200 is slidably connected to the inner wall of the movable cavity 140, and the other end of each insert block 200 passes through the two clearance grooves 130 and abuts against the inner wall of the preform during blow molding to form a positioning groove on the inner side of the handle. The two insert blocks 200 divide the movable cavity 140 into sections located in... The first space 141 between the two embedded blocks 200, and the second space 142 and the third space 143 located on the side of the two embedded blocks 200 away from the first space 141, respectively; the first flow channel 110 and the second flow channel 120 are disposed inside the handle mold 100, the first flow channel 110 connects the first space 141 with the external space, and the second flow channel 120 connects the external space with the second space 142 and the third space 143; the first flow channel 110 is used to supply air to the first space 141 or exhaust air from it, and the second flow channel 120 is used to supply air to the second space 142 and the third space 143 at the same time, so as to drive the two embedded blocks 200 to move towards or away from each other.
[0018] The handle mold 100 is used to form the shape of the handle; the moving cavity 140 provides a moving track and space for the two insert blocks 200, enabling them to move towards or away from each other within the cavity; the clearance groove 130 provides a channel and space for the vertical part of the insert block 200 to move along the axial direction of the moving cavity 140, ensuring smooth movement of the insert block 200; one end of the insert block 200 passes through the clearance groove 130 and abuts against the preform during blow molding to form the positioning groove on the inner side of the handle, while the other end acts as a piston, capable of sensing changes in air pressure and driving the overall movement; the first flow channel 110 and the second flow channel 120 are connected to an external air source, controlling the air pressure difference between the first space 141, the second space 142, and the third space 143 by supplying or venting air to different spaces, thereby providing the insert block 200 with the power to move towards or away from each other. By controlling the movement of the insert blocks 200 in opposite directions using pneumatic pressure, precise positioning during blow molding and avoidance during demolding are achieved, solving the demolding problem of the rear handle mold 100. The drive system is built into the mold plate, saving space on the outside and around the mold, making the mold structure more compact and easy to achieve miniaturization and lightweight design. The pneumatic system has a simple structure and the component cost is lower than that of a precision mechanical drive system, reducing the manufacturing cost of the mold.
[0019] During operation, in the molding stage, the preform is clamped in the cavity. The handle device is located at the bottom of the cavity. An external air supply device supplies air to the first space 141 through the first flow channel 110, increasing the air pressure in the first space 141. Simultaneously, air is exhausted from the second space 142 and the third space 143 through the second flow channel 120, decreasing the air pressure in the second space 142 and the third space 143. Utilizing the pressure difference between the first space 141 and the second and third spaces 143, the two insert blocks 200 are subjected to a force in the direction away from the first space 141, causing them to move in opposite directions. One end of the insert block 200 passing through the clearance groove 130 abuts against the preform. The molded wall forms the positioning groove on the inner side of the handle on the preform. Then, during the demolding stage, after the blow molding, holding pressure and cooling process is completed, the external air supply device exhausts air from the first space 141 through the first flow channel 110, reducing the air pressure in the first space 141. At the same time, air is supplied to the second space 142 and the third space 143 through the second flow channel 120, increasing the air pressure in the second space 142 and the third space 143. Under the action of the new pressure difference, the two insert blocks 200 are subjected to a force in the direction of the first space 141, thus moving towards each other and returning to their initial positions. The molded part of the insert block 200 exits from the positioning groove on the inner side of the already formed handle, and the mold can be demolded smoothly at this time.
[0020] The embedded block 200 moves solely through sliding friction with the inner wall of the moving cavity 140 during movement. This friction is relatively high, leading to uneven movement and potential jamming. Therefore, in one embodiment, each embedded block 200 includes a slider 210, an insert body 220, and a pulley 230. The insert body 220 is detachably mounted on the slider 210. The pulley 230 is positioned on the end of the insert body 220 near the clearance groove 130 and is rotatable relative to the insert body 220. The handle mold 100 has a slide rail 150 that mates with the pulley 230. The mating structure of pulley 230 and slide rail 150 reduces the friction when slider 210 moves, making the movement of insert block 200 smoother. This improves the accuracy of position control of insert block 200 during blow molding and demolding, ensuring the accuracy of handle positioning groove molding and demolding operation. It also reduces wear on components during movement, reduces the possibility of component damage due to friction, and thus extends the service life of the entire device.
[0021] During the movement of the insert block 200, the slider 210 is prone to deviating from the predetermined axial direction due to various external forces. Therefore, in one embodiment, the insert body 220 is provided with a threaded hole 221, and the slider 210 is provided with a mounting hole 211 that mates with the threaded hole 221. The insert body 220 is detachably fixed to the slider 210 by bolts. The bottom of the handle mold 100 is provided with a guide groove 160 that mates with the bolts. The guide groove 160 connects the moving cavity 140 with the external space. The extending direction of the guide groove 160 is parallel to the axial direction of the moving cavity 140. The shank of the bolt passes through the guide groove 160 and can slide along the extending direction of the guide groove 160. After the bolt passes through the guide groove 160 and the mounting hole 211 in sequence, it engages with the threaded hole 221 to detachably fix the insert body 220 to the slider 210, making it convenient to replace the insert body 220 of different shapes to adapt to different handle structures. The guide groove 160 opened at the bottom of the handle mold 100 and the sliding connection with the bolt realize the axial positioning of the slider 210, so that the insert 200 can move strictly in the predetermined axial direction when it moves in the moving cavity 140, effectively avoiding the deviation of the movement trajectory caused by external forces and other factors, and further ensuring the precise operation of the inner positioning groove forming of the handle during blow molding and demolding.
[0022] During gas supply or exhaust operations to the various spaces, gas may leak from the gap between the slider 210 and the inner wall of the moving cavity 140, causing the actual gas pressure in each space to fail to reach the expected value. Therefore, in one embodiment, each of the embedded blocks 200 further includes two sealing rings 240, which are respectively fixed on the outer peripheral walls at both ends of the slider 210, and the outer walls of the sealing rings 240 abut against the inner wall of the moving cavity 140. The sealing ring 240 is fixed on the outer peripheral walls of both ends of the slider 210 and abuts against the inner wall of the moving cavity 140. It can effectively seal the gap between the outer peripheral wall of the slider 210 and the inner wall of the moving cavity 140, preventing gas from leaking out from these gaps when supplying or venting gas to each space through the first flow channel 110 and the second flow channel 120. This ensures that a stable and expected air pressure difference can be formed between the first space 141, the second space 142 and the third space 143, ensuring that the embedded block 200 can move towards or away from each other under accurate air pressure drive, making the operation of the entire device more stable and reliable.
[0023] During movement, the slider 210 may experience air pressure loss, component failure, or other issues, leading to excessive movement and disengagement from the moving cavity 140. Therefore, in one embodiment, two end caps 300 are also included. The two end caps 300 are respectively disposed at both ends of the moving cavity 140 to close the ends of the moving cavity 140, and the two end caps 300 respectively form the end walls of the second space 142 or the third space 143. Two end caps 300 are respectively disposed at both ends of the moving cavity 140 and seal its ends. Together with the slider 210 and the inner wall of the moving cavity 140, they can form a more reliable air pressure chamber, which helps to maintain a stable and precise air pressure environment and ensures that the embedded block 200 can achieve stable movement in opposite directions based on the accurate air pressure difference. The end caps 300 form the end walls of the second space 142 or the third space 143, which physically limits the maximum movement stroke of the slider 210, prevents the slider 210 from moving excessively due to abnormal air pressure, component failure, etc., and avoids the slider 210 from leaving the moving cavity 140 or colliding with other components, thereby reducing the risk of component damage.
[0024] During blow molding, the mold remains at a high temperature for an extended period, which can significantly prolong the cooling and solidification time of the plastic within the mold, resulting in a longer blow molding cycle. Therefore, in one embodiment, a cooling channel is provided within the handle mold 100, and the handle mold 100 is equipped with an inlet 410 and an outlet 420 connected to the cooling channel. An external water supply device is connected to the cooling channel within the handle mold 100, allowing water to enter through the inlet 410 and exit through the outlet 420, thus achieving continuous and effective cooling of the high-temperature handle mold 100. This accelerates the cooling and solidification of the plastic within the mold, shortening the molding cycle of each blow molded bottle and enabling the production of more products per unit time, thereby significantly improving production efficiency. The cooling channel also ensures that the temperature of all parts of the handle mold 100 drops uniformly, effectively preventing defects such as deformation and dimensional deviations caused by uneven cooling of the bottle handle, and improving the overall product qualification rate.
[0025] The embedded block 200 may experience directional deviation during movement, causing it to fail to accurately position itself in the positioning groove inside the molded handle, thus affecting the molding accuracy of the positioning groove. Therefore, in one embodiment, an auxiliary mold 500 is also included. The auxiliary mold 500 is detachably disposed on the top of the handle mold 100. The auxiliary mold 500 has a profile that matches the expected shape of the bottle handle portion. The auxiliary mold 500 has a guide hole 510, the axis of which is parallel to the axis of the moving cavity 140. The end of the embedded block 200 away from the handle mold 100 passes through the guide hole 510, and the embedded block 200 is slidably connected to the guide hole 510. The auxiliary mold 500 is designed to fit the desired shape of the bottle handle. During blow molding, it acts directly on the preform, accurately shaping the shell to match the handle's shape. The guide hole 510 on the auxiliary mold 500 has its axis parallel to the axis of the moving cavity 140. The end of the insert block 200 away from the handle mold 100 passes through the guide hole 510 and is slidably connected to it, providing additional auxiliary guidance for the movement of the insert block 200. This further ensures the accuracy of the insert block 200's direction during movement, preventing it from shifting or wobbling, thus more accurately forming the positioning groove on the inner side of the handle on the preform. The auxiliary mold 500 is detachably mounted on the top of the handle mold 100 using bolts, clips, pins, and other connecting parts. When the auxiliary mold 500 is worn, damaged, or needs to be replaced with an auxiliary mold 500 of a different shape for different products, it can be easily and quickly disassembled and replaced, reducing maintenance costs.
[0026] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A rear handle device for a blow molding die, characterized in that, The device includes a handle mold, a first flow channel, a second flow channel, two clearance grooves, and two insert blocks. The handle mold has a horizontally extending movable cavity. The two clearance grooves are symmetrically arranged on the top surface of the handle mold, connecting the movable cavity to an external space. One end of each insert block is slidably connected to the inner wall of the movable cavity, and the other end of each insert block passes through the two clearance grooves and abuts against the inner wall of the preform during blow molding to form a positioning groove on the inner side of the handle. The two insert blocks divide the movable cavity into a first space between the two insert blocks, and a second space and a third space located on the side of each insert block opposite to the first space. The first and second flow channels are disposed inside the handle mold. The first flow channel connects the first space to the external space, and the second flow channel connects the external space to both the second and third spaces. The first flow channel supplies air to or exhausts air from the first space, and the second flow channel supplies air to or exhausts air from both the second and third spaces simultaneously, driving the two insert blocks to move towards or away from each other.
2. The rear handle device for a blow molding die according to claim 1, characterized in that, Each of the said insert blocks includes a slider, an insert body and a pulley. The insert body is detachably mounted on the slider. The pulley is disposed on one end of the insert body near the clearance groove and is rotatable relative to the insert body. The handle mold is provided with a slide rail that cooperates with the pulley.
3. The rear handle device for a blow molding die according to claim 2, characterized in that, The insert body is provided with a threaded hole, and the slider is provided with a mounting hole that mates with the threaded hole. The insert body is detachably fixed to the slider by bolts. The bottom of the handle mold is provided with a guide groove that mates with the bolts. The guide groove connects the moving cavity with the external space. The extension direction of the guide groove is parallel to the axial direction of the moving cavity. The shank of the bolt passes through the guide groove and can slide along the extension direction of the guide groove.
4. The rear handle device for a blow molding die according to claim 2, characterized in that, Each of the embedded blocks further includes two sealing rings, which are respectively fixed on the outer peripheral walls at both ends of the slider, and the outer walls of the sealing rings abut against the inner wall of the moving cavity.
5. The rear handle device for a blow molding die according to claim 1, characterized in that, It also includes two end caps, which are respectively disposed at both ends of the movable cavity to close the ends of the movable cavity, and the two end caps respectively constitute the end walls of the second space or the third space.
6. The rear handle device for a blow molding die according to claim 1, characterized in that, The handle mold is also provided with a cooling channel, and the handle mold is provided with an inlet and an outlet that are connected to the cooling channel.
7. The rear handle device for a blow molding die according to claim 1, characterized in that, It also includes an auxiliary mold, which is detachably disposed on the top of the handle mold. The auxiliary mold has a profile that matches the expected shape of the bottle handle. The auxiliary mold has a guide hole, the axis of which is parallel to the axis of the moving cavity. The end of the insert block away from the handle mold passes through the guide hole, and the insert block is slidably connected to the guide hole.