Bottle blowing machine with opening and closing locking mechanism

Abstract

The application discloses a bottle blowing machine with an opening and locking mechanism, which comprises a rack, a fixed shaft, a first side mold and a second side mold. The opening and locking mechanism comprises a fixed buckle fixed on the first side mold and a movable buckle rotatably arranged in the second side mold. The movable buckle comprises a cylindrical shaft body and a buckle groove radially arranged on the shaft body. The shaft center line direction of the shaft body is parallel to the fixed shaft. The fixed buckle comprises a plate body and a hook part protruding from the plate body. The buckle groove comprises a movable buckle surface for abutting the hook part. The distance between the movable buckle surface and the shaft center line of the shaft body in the radial direction is less than the rotation radius of the shaft body. When the bottle blowing machine is closed, the movable buckle is used for forward rotation to abut the movable buckle surface and the hook part, and the opening and locking mechanism is in a locked state. When the bottle blowing machine is opened, the movable buckle is used for reverse rotation to separate the movable buckle surface and the hook part, and the opening and locking mechanism is in an unlocked state. The bottle blowing machine with the opening and locking mechanism can reduce locking abnormalities and reduce the risk of decoupling and bottle explosion.

Description

Technical Field

[0001] This invention relates to the field of blow molding machine technology, and in particular to a blow molding machine with an opening and closing locking mechanism. Background Technology

[0002] A molding module on a rotary blow molding machine for forming a plastic preform into a plastic container includes: a frame and a central shaft fixedly mounted on the frame; two side molds, at least one of which can swing around the central shaft; a bottom mold frame that can move relative to the frame along the central shaft axis; two splitting side molds of the plastic container supported by the two side molds; and a bottom mold of the plastic container supported by the bottom mold frame.

[0003] When the two side molds and the bottom mold frame are closed, the two split side molds and the bottom mold of the plastic container form a hollow cavity, which can be used to form the plastic preform into a plastic container; when the two side molds and the bottom mold frame are opened, the formed plastic container can be taken out and sent into the plastic preform to be formed.

[0004] The opening and closing locking device of the two side molds of the rotary blow molding machine locks the two side molds together during the process of closing the two side molds to form the plastic preform into a plastic container, thereby achieving the locking of the two side molds; before the formed plastic container is taken out and sent into the plastic preform to be formed, the opening and closing locking device releases the mutual locking of the two side molds, thereby achieving the unlocking of the two side molds.

[0005] In the existing technology, the opening and closing locking of two side molds is achieved by a pair of interlocking fixed and movable buckles, which has the following disadvantages:

[0006] Since the movable buckle and the movable buckle shaft are two parts, the distance between the movable buckle bearing surface and the movable buckle shaft axis is relatively large due to the constraints of the movable buckle structure. This means that the movable buckle must be driven by a torsion spring with a large torque in order to overcome the friction between the movable buckle and the fixed buckle bearing surface and achieve locking, which can easily lead to locking abnormalities.

[0007] Since the movable buckle and the fixed buckle must rotate relative to each other in the locked state to unlock, the normal at the centroid of the movable buckle's bearing surface must be deviated from the axis of rotation of the movable buckle. This means that when the bearing surfaces of the movable buckle and the fixed buckle are pressed together under the pressure of the bottle being blown, the movable buckle has to bear a large torque in the unlocking direction, which increases the risk of disengagement and bottle explosion. Summary of the Invention

[0008] The purpose of this invention is to provide a blow molding machine with an opening and closing locking mechanism, which can reduce locking abnormalities and lower the risk of bottle explosion due to detachment.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A blow molding machine with an opening and closing mechanism includes a frame, a fixed shaft mounted on the frame, and a first and second side mold that can be rotatably opened and closed. At least one of the first and second side molds can rotate about the axis of the fixed shaft. The opening and closing mechanism includes a fixed buckle fixed to the opening end of the first side mold and a movable buckle rotatably inserted into the opening end of the second side mold about its own axis. The movable buckle includes a cylindrical shaft body and a buckle groove radially recessed on the shaft body. The axis of the shaft body is parallel to the fixed shaft. The fixed buckle includes a plate body and a hook portion protruding from the plate body. The buckle groove includes a movable buckle surface for engaging and abutting the hook portion. The radial distance between the movable buckle surface and the axis of the shaft body is less than the radius of rotation of the shaft body.

[0011] The locking / unlocking mechanism has a locked state and an unlocked state:

[0012] When the blow molding machine closes the mold, the movable buckle is used to rotate forward until the movable buckle surface abuts against the hook, and the opening and closing locking mechanism is in the locked state;

[0013] When the blow molding machine opens the mold, the movable buckle is used to rotate in the opposite direction until the movable buckle surface is separated from the hook part, and the opening and closing locking mechanism is in the unlocked state.

[0014] Preferably, at least two sets of buckle grooves are provided on the shaft body at intervals along its axial centerline, the opening end of the second side mold is provided with a side mold recess that is aligned with the buckle groove, and a side mold protrusion is provided between adjacent side mold recesses.

[0015] More preferably, the length direction of the plate body is parallel to the shaft body, and at least two sets of hooks are provided on the plate body at intervals along its length direction. A plate recess is provided between adjacent hooks, the hooks are aligned with the buckle grooves, and the plate recesses are aligned with the side mold protrusions.

[0016] When the blow molding machine closes the mold, the protrusion of the side mold is fitted into the recess of the plate.

[0017] Preferably, the hook is L-shaped, and the opening of the hook faces the mold closing center.

[0018] Preferably, the hook is L-shaped, and the opening of the hook faces away from the mold closing center.

[0019] Preferably, the movable buckle has a first limit position and a second limit position when it rotates relative to the second side mold:

[0020] When the movable buckle is in the first extreme position, the buckle groove and the hook part separate from each other, thereby allowing the fixed buckle to move relative to the movable buckle;

[0021] When the movable buckle is in the second extreme position, the buckle groove and the hook portion abut against each other, thereby preventing the fixed buckle from moving relative to the movable buckle.

[0022] Preferably, the hook portion includes a fixed buckle surface for fitting into the movable buckle surface.

[0023] More preferably, the fixed fastening surface and the movable fastening surface are respectively planes for mutual contact.

[0024] More preferably, the fixed fastening surface and the movable fastening surface are respectively a convex arc surface and a concave arc surface for mutual contact.

[0025] More preferably, the fixed fastening surface and the movable fastening surface are respectively irregularly shaped surfaces for mutual contact.

[0026] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The blow molding machine with opening and closing locking mechanism of the present invention has the following advantages:

[0027] The movable buckle serves as both the pivot of the rotating joint and the locking component of the locking structure, making it simple in structure and easy to manufacture.

[0028] During the locking process, the movable buckle and the fixed buckle rotate relative to each other, and the movable buckle surface and the fixed buckle fit together tightly. During this process, friction between the movable buckle surface and the fixed buckle is inevitable. To overcome the friction and achieve locking, a sufficiently large torque must be applied to the movable buckle. The magnitude of this torque depends on two factors: one is the frictional force between the movable buckle surface and the fixed buckle, and the other is the distance between the movable buckle surface (i.e., the line of action of the frictional force) and the rotation axis of the movable buckle. By setting the buckle groove radially concave on the shaft body, the distance between the movable buckle surface and the rotation axis of the movable buckle is smaller. On the basis of the constant frictional force between the movable buckle surface and the fixed buckle, the torque required to drive the movable buckle to lock is also smaller. This is not only beneficial to the design of the locking torsion spring, but also helps to reduce locking abnormalities.

[0029] In the locked state, the movable buckle and the fixed buckle must rotate relative to each other to unlock. If the buckle surfaces of the movable buckle and the fixed buckle are flat, the normal at the centroid of the movable buckle surface must deviate from the rotation axis of the movable buckle. Consequently, when the buckle surfaces of the movable buckle and the fixed buckle are pressed together under the pressure of the blown bottle, the movable buckle has to bear a large torque in the unlocking direction, which can easily cause the buckle to disengage and the bottle to explode. In this application, the movable buckle is a functional combination of a shaft and a buckle. The outer cylindrical surface diameter (i.e., shaft diameter) of the shaft body is large, and the friction circle radius of the rotating pair formed by the movable buckle and the second side mold is also large. Since the friction circle radius of the rotating pair is proportional to the shaft diameter, the holding torque required to prevent the movable buckle from disengaging and exploding is also small, which can effectively reduce the risk of disengaging and exploding the bottle. Attached Figure Description

[0030] Appendix Figure 1 This is a schematic diagram of the structure of a blow molding machine with an opening and closing locking mechanism, as shown in Example 1.

[0031] Appendix Figure 2 This is a front view of a blow molding machine with an opening and closing mechanism, as described in Embodiment 1.

[0032] Appendix Figure 3 For the appendix Figure 2 A cross-sectional view along line AA (locked state);

[0033] Appendix Figure 4 For the appendix Figure 2 A cross-sectional view along line AA (unlocked state);

[0034] Appendix Figure 5 This is a structural diagram of the movable buckle;

[0035] Appendix Figure 6 For the appendix Figure 5 Sectional view along the BB line;

[0036] Appendix Figure 7 This is a structural diagram of the fastener;

[0037] Appendix Figure 8 This is a schematic diagram of the blow molding machine with opening and closing mechanism in Embodiment 2;

[0038] Appendix Figure 9 This is a front view of the blow molding machine with opening and closing locking mechanism in Embodiment 2;

[0039] Appendix Figure 10 For the appendix Figure 9 A cross-sectional view along line AA (locked state);

[0040] Appendix Figure 11 For the appendix Figure 9 Cross-sectional view along line AA (unlocked state).

[0041] Wherein: 1. Drive swing arm; 2. Fixed shaft; 3. First side mold; 4. Second side mold; 41. Side mold recess; 42. Side mold protrusion; 5. Fixed buckle; 51. Plate body; 52. Hook; 521. Fixed buckle surface; 53. Plate recess; 6. Movable buckle; 61. Shaft body; 62. Buckle groove; 621. Movable buckle surface. Detailed Implementation

[0042] The technical solution of the present invention will be further described below with reference to specific embodiments and accompanying drawings.

[0043] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0044] In the description of the embodiments of the present invention, it should be understood that the terms "length", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present invention.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0047] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0049] See Figure 1-2 As shown, Embodiment 1 provides a blow molding machine with an opening and closing locking mechanism. The blow molding machine includes a frame, a fixed shaft 2 disposed on the frame, and a first side mold 3 and a second side mold 4 that can be rotatably opened and closed relative to each other. At least one of the first side mold 3 and the second side mold 4 is rotatably disposed on the frame about the axis of the fixed shaft 2. In this embodiment, it is a double-opening mold frame, that is, both the first side mold 3 and the second side mold 4 can be rotatably sleeved on the fixed shaft 2.

[0050] See Figure 3-7 As shown, the opening and closing locking mechanism includes a fixed buckle 5 fixed on the opening end of the first side mold 3 and a movable buckle 6 that can rotate around its own axis and passes through the opening end of the second side mold 4. The lower end of the movable buckle 6 extends downward out of the opening end of the second side mold 4, and the movable buckle 6 is driven to rotate by a drive swing arm 1 installed at the lower end of the movable buckle 6.

[0051] The movable buckle 6 includes a cylindrical shaft body 61 and a buckle groove 62 radially recessed on the shaft body 61. The buckle groove 62 includes a movable buckle surface 621 for engaging with the hook portion 52. The radial distance between the movable buckle surface 621 and the axis of the shaft body 61 is less than the radius of rotation of the shaft body 61. The axis of the shaft body 61 is parallel to the fixed shaft 2, and a through hole for the shaft body 61 to pass through is provided in the open end of the second side mold 4.

[0052] See Figure 1 , Figure 5 As shown, at least two sets of buckle grooves 62 are provided at intervals along the axis of the shaft body 61. The opening end of the second side mold 4 is provided with a side mold recess 41 that is aligned with the buckle groove 62 along the axis of the fixed shaft 2. A side mold protrusion 42 is provided between adjacent side mold recesses 41. By providing the side mold recess 41, the buckle groove 62 can be exposed outside the second side mold 4 to cooperate with the fixed buckle 5 for locking and unlocking.

[0053] The fixing buckle 5 includes a plate body 51 and a hook portion 52 protruding from the plate body 51. The hook portion 52 includes a fixing buckle surface 521 for fitting into the movable buckle surface 621. In this embodiment, the hook portion 52 is L-shaped, and the opening of the hook portion 52 faces away from the mold closing center, that is, the opening is set outward.

[0054] The length of the plate body 51 is parallel to the shaft body 61, see [reference]. Figure 1 , Figure 7 As shown, at least two sets of hooks 52 are spaced apart along the length of the plate body 51. Plate recesses 53 are provided between adjacent hooks 52. The hooks 52 and the snap grooves 62 are aligned one-to-one along the axis of the vertical fixed shaft 2. The plate recesses 53 and the side mold protrusions 42 are aligned one-to-one along the axis of the vertical fixed shaft 2. When the blow molding machine closes the mold, the side mold protrusions 42 are fitted into the plate recesses 53.

[0055] In the first embodiment of this example, the fixed fastening surface 521 and the movable fastening surface 621 are respectively planes for mutual contact;

[0056] In the second embodiment of this example, the fixed fastening surface 521 and the movable fastening surface 621 are respectively a convex arc surface and a concave arc surface for mutual contact;

[0057] In the third embodiment of this example, the fixed fastening surface 521 and the movable fastening surface 621 are respectively irregularly shaped surfaces used for mutual fitting.

[0058] When the movable buckle 6 rotates relative to the second side mold 4, it has a first limit position and a second limit position:

[0059] When the movable buckle 6 is in the first extreme position, the buckle groove 62 and the hook 52 separate from each other, thereby allowing the fixed buckle 5 to move relative to the movable buckle 6;

[0060] When the movable buckle 6 is in the second extreme position, the buckle groove 62 and the hook part 52 abut against each other, thereby preventing the fixed buckle 5 from moving relative to the movable buckle 6.

[0061] The above-mentioned locking and unlocking mechanism has a locked state and an unlocked state:

[0062] When the blow molding machine closes the mold, the movable buckle 6 is used to rotate forward until the movable buckle surface 621 abuts against the fixed buckle surface 521 of the hook part 52, and the opening and closing locking mechanism is in the locked state.

[0063] When the blow molding machine opens the mold, the movable buckle 6 is used to rotate in the opposite direction until the movable buckle surface 621 separates from the fixed buckle surface 521 of the hook part 52, and the opening and closing locking mechanism is in the unlocked state.

[0064] See Figure 8-11 As shown, Embodiment 2 provides a blow molding machine with an opening and closing mechanism. The main difference between Embodiment 2 and Embodiment 1 is that the opening of the hook 52 faces the mold closing center, that is, the opening is set inward.

[0065] The working process of this embodiment is described in detail below:

[0066] When the mold is opened, the movable buckle 6 is driven to rotate in the opposite direction by the drive swing arm 1 until the movable buckle surface 621 separates from the fixed buckle surface 521 of the hook part 52. The movable buckle 6 switches from the second limit position to the first limit position, allowing the fixed buckle 5 to move relative to the movable buckle 6. The opening and closing locking mechanism is in the unlocked state, and the first side mold 3 and the second side mold 4 rotate relative to each other and open.

[0067] When the mold is closed, the first side mold 3 and the second side mold 4 rotate relative to each other and close. The movable buckle 6 is driven to rotate forward by the drive swing arm 1 until the movable buckle surface 621 abuts against the fixed buckle surface 521 of the hook part 52. The movable buckle 6 switches from the first limit position to the second limit position, preventing the fixed buckle 5 from moving relative to the movable buckle 6. The opening and closing locking mechanism is in the locked state.

[0068] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A blow molding machine with an opening and closing locking mechanism, the blow molding machine comprising a frame, a fixed shaft disposed on the frame, a first side mold and a second side mold rotatably opening and closing relative to each other, at least one of the first side mold and the second side mold being rotatable about the axis of the fixed shaft, characterized in that: The opening and closing locking mechanism includes a fixed buckle fixed to the opening end of the first side mold and a movable buckle that can rotate around its own axis and pass through the opening end of the second side mold; the movable buckle includes a cylindrical shaft body and a buckle groove radially recessed on the shaft body, and the axis of the shaft body is parallel to the fixed shaft. The fixing buckle includes a plate body and a hook protruding from the plate body; the buckle groove includes a movable buckle surface for engaging and abutting the hook, and the radial distance between the movable buckle surface and the axis of the shaft body is less than the rotation radius of the shaft body. The locking / unlocking mechanism has a locked state and an unlocked state: When the blow molding machine closes the mold, the movable buckle is rotated forward until the movable buckle surface abuts against the hook. At this time, the buckle groove and the hook are hooked together, and the opening and closing locking mechanism is in the locked state. When the blow molding machine opens the mold, the movable buckle is used to rotate in the opposite direction until the movable buckle surface is separated from the hook part. At this time, the buckle groove is disengaged from the hook part, and the opening and closing locking mechanism is in the unlocked state.

2. The blow molding machine with opening and closing mechanism according to claim 1, characterized in that: At least two sets of buckle grooves are provided at intervals along the axis of the shaft body, and the opening end of the second side mold is provided with a side mold recess that is aligned with the buckle groove one by one, and a side mold protrusion is provided between adjacent side mold recesses.

3. The blow molding machine with opening and closing mechanism according to claim 2, characterized in that: The length direction of the plate body is parallel to the shaft body. At least two sets of hooks are provided on the plate body at intervals along its length direction. A plate recess is provided between adjacent hooks. The hooks are aligned with the buckle grooves one by one, and the plate recesses are aligned with the side mold protrusions one by one. When the blow molding machine closes the mold, the protrusion of the side mold is fitted into the recess of the plate.

4. The blow molding machine with opening and closing mechanism according to claim 1, characterized in that: The hook is L-shaped, and the opening of the hook faces the mold closing center.

5. The blow molding machine with opening and closing locking mechanism according to claim 1, characterized in that: The hook is L-shaped, and the opening of the hook faces away from the mold closing center.

6. The blow molding machine with opening and closing locking mechanism according to claim 1, characterized in that: The movable buckle has a first limit position and a second limit position when it rotates relative to the second side mold: When the movable buckle is in the first extreme position, the buckle groove and the hook part separate from each other, thereby allowing the fixed buckle to move relative to the movable buckle; When the movable buckle is in the second extreme position, the buckle groove and the hook portion abut against each other, thereby preventing the fixed buckle from moving relative to the movable buckle.

7. The blow molding machine with opening and closing locking mechanism according to claim 1, characterized in that: The hook portion includes a fixed buckle surface for fitting together with the movable buckle surface.

8. The blow molding machine with opening and closing locking mechanism according to claim 7, characterized in that: The fixed fastening surface and the movable fastening surface are respectively planes used for mutual contact.

9. The blow molding machine with opening and closing locking mechanism according to claim 7, characterized in that: The fixed fastening surface and the movable fastening surface are respectively a convex arc surface and a concave arc surface for mutual contact.

10. The blow molding machine with opening and closing locking mechanism according to claim 7, characterized in that: The fixed fastening surface and the movable fastening surface are irregularly shaped surfaces used for mutual fitting.

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