Stretching rod structure

Abstract

A stretching rod structure comprises a stretching rod body. A fluid pipeline axially extending along the central axis is arranged in the stretching rod main body, the top end of the fluid pipeline is communicated with the outside, and the bottom end of the fluid pipeline is closed; a fluid leading-out hole set is formed in the stretching rod body and comprises a plurality of fluid leading-out holes evenly distributed in the circumferential direction of the central axis, one end of each fluid leading-out hole is communicated with a fluid pipeline, the other end of each fluid leading-out hole is communicated with the outside, and the fluid leading-out holes are provided with offset angles relative to the radial axis of the stretching rod body. The fluid leading-out hole is offset by a certain angle relative to the radial axis of the stretching rod main body, so that after being guided and blown out through the fluid leading-out hole, gas can correspondingly act on a bottle blank to have a larger circumferential range, and blow molding pressure is uniformly distributed in the circumferential direction, so that plastic of a blow-molded bottle is more uniformly distributed, and the quality of the bottle is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bottle blowing moulds, in particular to a stretching rod structure. Background Art

[0002] During the blowing process of plastic bottles, the axial stretching of the preform is achieved by the stretching rod extending into the interior of the preform and pressing against the bottom of the preform and moving downward, so that the axial length of the preform continues to increase, thereby achieving axial stretching. The radial stretching of the preform requires the stretching rod to blow high-pressure gas in all directions to cause the preform to expand radially and achieve radial stretching.

[0003] In the existing stretch rod structure, reference can be made to the utility model patent of the sensor stretch rod structure applied to the biaxial stretch hollow blow molding mold previously applied and disclosed by the applicant, the patent number is CN210126275U, and the stretch rod structure mentioned in the patent can be referred to as follows Figure 1 and Figure 2 As shown in the figure, the fluid outlet holes are generally arranged radially. After the gas is guided and blown out through the fluid outlet holes, the circumferential range in which it can act on the bottle blank is limited, resulting in uneven distribution of the blow molding pressure in the circumferential direction, which in turn leads to uneven distribution of plastic in the blow-molded bottle, affecting the quality of the bottle.

[0004] Meanwhile, when bottles of different specifications and different bottom structures need to be produced, the stretching rod needs to be redesigned according to the bottle specifications, so the entire stretching rod needs to be replaced, which not only increases production costs and wastes resources, but also affects production efficiency. Utility Model Content

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a stretch rod structure.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A stretching rod structure comprises a stretching rod body; a fluid pipeline extending axially along a central axis is provided inside the stretching rod body, the top end of the fluid pipeline is connected to the outside world, and the bottom end is closed; a fluid lead-out hole group is provided on the stretching rod body, the fluid lead-out hole group comprises a plurality of fluid lead-out holes uniformly distributed circumferentially along the central axis, one end of the fluid lead-out hole is connected to the fluid pipeline, and the other end is connected to the outside world, and the fluid lead-out hole is provided with an offset angle relative to the radial axis of the stretching rod body.

[0008] Furthermore, the stretching rod body is provided with a plurality of groups of fluid outlet holes, and the plurality of groups of fluid outlet holes are arranged in sequence along the central axis.

[0009] Furthermore, the offset angle of the fluid outlet hole relative to the radial axis is 30° to 60°.

[0010] In the utility model, the stretching rod body comprises an upper rod body and a lower rod body, the lower rod body is detachably connected to the upper rod body, and the fluid outlet hole group is arranged on the lower rod body.

[0011] Furthermore, the upper rod body and the lower rod body are connected by threads, the bottom end of the upper rod body is provided with an upper rod body mounting recess, and the inner circumference of the upper rod body mounting recess is provided with an upper rod internal thread;

[0012] The top end of the lower rod body is provided with a lower rod body mounting protrusion matched with the upper rod body mounting recess, and the outer periphery of the lower rod body mounting protrusion is provided with a lower rod body outer thread matched with the upper rod body inner thread.

[0013] Furthermore, the upper rod body is provided with an upper rod body fluid pipeline extending axially along the central axis, the top end of the upper rod body fluid pipeline is connected to the outside, and the bottom end extends to the top surface of the upper rod body mounting recess;

[0014] The lower rod body is provided with a lower rod body fluid pipeline extending axially along the central axis, the top end of the lower rod body fluid pipeline extends to the top surface of the lower rod body mounting protrusion, and the bottom end of the lower rod body is closed;

[0015] After the upper rod body is connected to the lower rod body, the fluid pipeline of the upper rod body is communicated with the fluid pipeline of the lower rod body.

[0016] In the utility model, the stretching rod body also includes a stretching head detachably connected to the lower rod body.

[0017] Furthermore, the lower rod body and the stretching head are connected by threads, wherein:

[0018] The bottom end of the lower rod body is provided with a lower rod body installation recess, and the inner periphery of the lower rod body installation recess is provided with a lower rod internal thread;

[0019] The top of the stretching head is provided with a stretching head mounting protrusion matched with the lower rod body mounting recess, and the outer periphery of the stretching head mounting protrusion is provided with a stretching head external thread matched with the lower rod body internal thread.

[0020] In the utility model, a stretching head is detachably connected to the bottom of the stretching rod body.

[0021] The utility model has the following advantages and beneficial effects:

[0022] 1. The fluid outlet hole is offset at a certain angle relative to the radial axis of the stretch rod body, so that after the gas is guided and blown out through the fluid outlet hole, it can act on the bottle blank in a larger circumferential range, so that the blow molding pressure is evenly distributed in the circumferential direction, thereby making the plastic distribution of the blow-molded bottle more uniform, which is beneficial to improving the quality of the bottle.

[0023] 2. Multiple groups of fluid outlet holes are arranged axially along the central axis. After the gas is guided and blown out through the fluid outlet holes, it can act on the bottle blank in a larger axial range, so that the blow molding pressure is evenly distributed in the axial direction, thereby making the plastic distribution of the blow-molded bottle more uniform, which is beneficial to improving the quality of the bottle and can effectively improve the blow molding efficiency.

[0024] 3. The stretching rod body is detachably connected to the stretching head; or the upper rod body is detachably connected to the lower rod body; or the upper rod body is detachably connected to the lower rod body, and the lower rod body is detachably connected to the stretching head; with this split stretching rod structure, when producing bottles of the same specifications but different bottle bottom structures, only the corresponding stretching head or lower rod body needs to be replaced, which reduces production costs and saves resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0026] Figure 1 is a schematic diagram of a tensile structure in the background art;

[0027] Figure 2 for Figure 1 AA section view in;

[0028] Figure 3 is a schematic diagram of the tensile structure in this embodiment;

[0029] Figure 4 for Figure 3 Middle BB section view;

[0030] Figure 5 Schematic diagram of the connection between the upper rod body and the lower rod body in this embodiment;

[0031] Figure 6 This is a schematic diagram of the connection between the lower rod body and the stretching head in this embodiment;

[0032] Figure 7 It is a schematic diagram of the connection between the stretching rod body and the stretching head in this embodiment. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model, but the utility model is not limited to the following embodiments.

[0034] like Figures 3 to 7As shown, this embodiment discloses a stretching rod structure, including a stretching rod body 1; a fluid pipeline 11 extending axially along the central axis is provided inside the stretching rod body 1, the top of the fluid pipeline 11 is connected to the outside, and the bottom is closed; a fluid outlet hole group for conveying fluid is provided near the bottom of the stretching rod body 1, and the fluid outlet hole group includes a plurality of fluid outlet holes 12 uniformly distributed along the circumference of the central axis. In this embodiment, four fluid outlet holes 12 are preferably provided, wherein one end of the fluid outlet hole 12 is connected to the fluid pipeline 11, and the other end is connected to the outside, and the fluid outlet hole 12 has a certain offset angle relative to the radial axis of the stretching rod body 1. The offset angle enables the gas to act on a larger circumferential range of the bottle blank after being guided and blown out through the fluid outlet hole 12, so that the blow molding pressure is uniformly distributed in the circumferential direction, thereby making the plastic distribution of the blow-molded bottle more uniform, which is conducive to improving the quality of the bottle.

[0035] In this embodiment, the stretching rod body 1 is provided with a plurality of groups of fluid outlet hole groups, and the plurality of groups of fluid outlet hole groups are arranged in sequence along the central axis. The plurality of groups of fluid outlet hole groups correspond to a larger axial range of the bottle blank, so that the blow molding pressure is evenly distributed in the axial direction, thereby making the plastic distribution of the blow-molded bottle more even, which is beneficial to improving the quality of the bottle and can effectively improve the blow molding efficiency.

[0036] In this embodiment, the offset angle of the fluid outlet hole 12 relative to the radial axis is 30° to 60°.

[0037] In this embodiment, the stretch rod body 1 includes an upper rod body 13 and a lower rod body 14 . The lower rod body 14 is detachably connected to the upper rod body 13 , and the fluid outlet hole group is arranged on the lower rod body 14 .

[0038] Furthermore, the upper rod body 13 and the lower rod body 14 are connected by threads, wherein the bottom end of the upper rod body 13 is provided with an upper rod body mounting recess 131, and the inner circumference of the upper rod body mounting recess 131 is provided with an upper rod body internal thread;

[0039] The top of the lower rod body 14 is provided with a lower rod body mounting protrusion 141 matched with the upper rod body mounting recess 131 , and the outer periphery of the lower rod body mounting protrusion 141 is provided with a lower rod body outer thread matched with the upper rod body inner thread.

[0040] Furthermore, the upper rod body 13 is provided with an upper rod body fluid pipeline 132 extending axially along the central axis, the top end of the upper rod body fluid pipeline 132 is connected to the outside, and the bottom end extends to the top surface of the upper rod body mounting recess 131;

[0041] The lower rod body 14 is provided with a lower rod body fluid pipeline 142 extending axially along the central axis, the top end of the lower rod body fluid pipeline 142 extends to the top surface of the lower rod body mounting protrusion 141, and the bottom end of the lower rod body 14 is closed;

[0042] After the upper rod body 13 is connected to the lower rod body 14 , the upper rod body fluid pipeline 132 is communicated with the lower rod body fluid pipeline 142 .

[0043] Furthermore, the stretching rod body 1 also includes a stretching head 15 detachably connected to the lower rod body 14 .

[0044] Specifically, the lower rod body 14 and the stretching head 15 are connected by threads, wherein:

[0045] The bottom end of the lower rod body 14 is provided with a lower rod body installation recess 143, and the inner periphery of the lower rod body installation recess 143 is provided with a lower rod internal thread;

[0046] The top of the stretching head 15 is provided with a stretching head mounting protrusion 151 matched with the lower rod body mounting recess 143, and the outer periphery of the stretching head mounting protrusion 151 is provided with a stretching head external thread matched with the lower rod body internal thread.

[0047] Not limited to the above embodiments, Figure 7 As shown, the stretching head 15 can also be directly detachably connected to the integrated stretching rod body 1. The connection method between the stretching head 15 and the stretching rod body 1 can refer to the connection method between the stretching head 15 and the lower rod body 14, which will not be elaborated here.

[0048] The above contents described in this specification are merely examples of the present invention. Technicians in the technical field to which the present invention belongs can make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the contents of the present invention specification or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A stretching rod structure, comprising a stretching rod body; a fluid pipeline extending axially along the central axis is provided inside the stretching rod body, the top end of the fluid pipeline is connected to the outside, and the bottom end is closed; characterized in that: The stretching rod body is provided with a fluid lead-out hole group, and the fluid lead-out hole group includes a plurality of fluid lead-out holes uniformly distributed circumferentially along the central axis, one end of the fluid lead-out hole is connected to the fluid pipeline, and the other end is connected to the outside world, and the fluid lead-out hole is provided with an offset angle relative to the radial axis of the stretching rod body.

2. A stretch rod structure according to claim 1, characterized in that: The stretching rod body is provided with a plurality of fluid outlet hole groups, and the plurality of fluid outlet hole groups are arranged in sequence along the central axis.

3. A stretch rod structure according to claim 1, characterized in that: The fluid outlet hole is offset at an angle of 30° to 60° relative to the radial axis.

4. A stretch rod structure according to any one of claims 1 to 3, characterized in that: The stretching rod body comprises an upper rod body and a lower rod body, the lower rod body is detachably connected to the upper rod body, and the fluid outlet hole group is arranged on the lower rod body.

5. A stretch rod structure according to claim 4, characterized in that: The upper rod body and the lower rod body are connected by threads, the bottom end of the upper rod body is provided with an upper rod body mounting recess, and the inner circumference of the upper rod body mounting recess is provided with an upper rod internal thread; The top end of the lower rod body is provided with a lower rod body mounting protrusion matched with the upper rod body mounting recess, and the outer periphery of the lower rod body mounting protrusion is provided with a lower rod body outer thread matched with the upper rod body inner thread.

6. A stretch rod structure according to claim 5, characterized in that: The upper rod body is provided with an upper rod body fluid pipeline extending axially along the central axis, the top end of the upper rod body fluid pipeline is connected to the outside, and the bottom end extends to the top surface of the upper rod body mounting recess; The lower rod body is provided with a lower rod body fluid pipeline extending axially along the central axis, the top end of the lower rod body fluid pipeline extends to the top surface of the lower rod body mounting protrusion, and the bottom end of the lower rod body is closed; After the upper rod body is connected to the lower rod body, the fluid pipeline of the upper rod body is communicated with the fluid pipeline of the lower rod body.

7. A stretch rod structure according to claim 4, characterized in that: The stretching rod body also includes a stretching head detachably connected to the lower rod body.

8. A stretch rod structure according to claim 7, characterized in that: The lower rod body and the stretching head are connected by threads, wherein: The bottom end of the lower rod body is provided with a lower rod body installation recess, and the inner periphery of the lower rod body installation recess is provided with a lower rod internal thread; The top of the stretching head is provided with a stretching head mounting protrusion matched with the lower rod body mounting recess, and the outer periphery of the stretching head mounting protrusion is provided with a stretching head external thread matched with the lower rod body internal thread.

9. A stretch rod structure according to any one of claims 1 to 3, characterized in that: The bottom of the stretching rod body is detachably connected with a stretching head.

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