Temperature-controllable core rod structure of hollow injection blow molding machine

Abstract

The utility model discloses a temperature-controllable core rod structure of an injection blow molding machine, which belongs to the technical field of injection blow molding machines and comprises a rod body, a stepped sliding chute is arranged in the rod body, a core rod movable rod is arranged in the stepped sliding chute in a sliding manner, a stepped channel is arranged in the core rod movable rod, and the stepped channel is communicated with the stepped sliding chute. An oil passing pipe and a rod head positioning rod are in threaded connection with the interior of the stepped channel, the oil passing pipe is sleeved with the rod head positioning rod, the rod head positioning rod is sleeved with a rod head compression spring, the left end of the rod head compression spring abuts against the right end of the core rod movable rod, and the right end of the rod head compression spring abuts against the second step of the stepped sliding groove; the right end of the rod head positioning rod is connected with a rod head, and a cooling circulation channel is formed among the stepped channel, the oil passing pipe, the rod head positioning rod and the rod head. The utility model mainly solves the problem that when the injection blow hollow molding machine injects a tube blank at an injection station, the mold core rod is at a reasonable temperature, so that the production efficiency is influenced by material sticking on the surface after the temperature of the core rod is too high.

Description

Technical Field

[0001] This utility model belongs to the technical field of injection blow molding machines, and in particular relates to a temperature-controlled mandrel structure for injection blow hollow molding machines. Background Technology

[0002] In blow molding of hollow plastic bodies, the blown mandrel used for this purpose must be maintained at an optimal temperature for the process requirements. After the system is started, a balance should be established for each blown mandrel between the heat provided by the plastic injected into the mandrel and the heat dissipated by the cooling effect of the surrounding air on the mandrel. However, the temperature suitable for blow molding is established naturally only under appropriate conditions. Nevertheless, because no adjustment can be made, it cannot be guaranteed that the temperature of the blown mandrel will always remain within the appropriate range, and therefore this condition cannot be reliably achieved. Obviously, when a failure occurs, the temperature will deviate from the optimal value. Therefore, there is an urgent need for a temperature-controlled mandrel structure to overcome the shortcomings of the existing technology. Utility Model Content

[0003] The purpose of this invention is to provide a temperature-controlled mandrel structure for an injection blow molding machine to address the shortcomings of existing technologies.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A temperature-controlled mandrel structure for an injection blow molding machine includes: a mandrel body, the interior of which has a stepped groove, a mandrel movable rod slidably disposed inside the stepped groove, a stepped channel inside the mandrel movable rod, an oil pipe and a mandrel head positioning rod connected internally to the stepped channel, the mandrel head positioning rod being sleeved on the outside of the oil pipe, a mandrel head compression spring being sleeved on the outside of the mandrel head positioning rod, the left end of the mandrel head compression spring abutting against the right end of the mandrel movable rod, the right end of the mandrel head compression spring abutting against the second step of the stepped groove, a mandrel head being connected to the right end of the mandrel head positioning rod, and a cooling circulation channel being formed between the stepped channel, the oil pipe, the mandrel head positioning rod and the mandrel head.

[0006] In a preferred embodiment, the stepped slide includes a large slide, a medium slide, and a small slide, with a first-level step formed between the large slide and the medium slide, and a second-level step formed between the medium slide and the small slide.

[0007] In a preferred embodiment, a limiting step is provided at the right end of the mandrel movable rod, and the limiting step forms a sliding limit with the first-level step.

[0008] In a preferred embodiment, the mandrel movable rod has an air inlet hole inside. The air inlet hole is connected to the machine's air blowing hole at its left end and to the middle sliding groove at its right end. A first gap is formed between the mandrel body and the mandrel head positioning rod. The air inlet hole, the middle sliding groove, and the first gap are connected in sequence to form a blow molding channel.

[0009] In a preferred embodiment, the stepped channel includes a small channel, a medium channel, and a large channel. The right end of the small channel is threadedly and sealed to the left end of the oil pipe, and the right end of the large channel is threadedly and sealed to the left end of the rod head positioning rod.

[0010] In a preferred embodiment, the mandrel movable rod is provided with an inlet and an outlet. The inlet is connected to a small channel, and the outlet is connected to a middle channel. A second gap is formed between the oil pipe and the mandrel head, and a third gap is formed between the mandrel head positioning rod and the oil pipe. The inlet, small channel, oil pipe, second gap, third gap, middle channel, and outlet are sequentially connected to form a cooling circulation channel.

[0011] In a preferred embodiment, the rod body is provided with clearance grooves at positions corresponding to the liquid inlet and liquid outlet.

[0012] In a preferred embodiment, the left end of the mandrel movable rod is threadedly connected to a push rod screw, and the left end of the push rod screw is connected to the top plate of the machine base through a star nut.

[0013] In a preferred embodiment, two O-rings are provided between the mandrel movable rod and the rod body.

[0014] The present invention provides a temperature-controlled mandrel structure for an injection blow molding machine, which has the following advantages compared with the prior art:

[0015] This invention mainly solves the problem of ensuring that the mold mandrel is at a reasonable temperature when injecting the tube blank at the injection station of the injection blow molding machine, so as to avoid the surface of the mandrel sticking due to excessive temperature, which would affect production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2 This is a perspective view of the present utility model;

[0019] Figure 3 This is a cross-sectional view of the rod body of this utility model;

[0020] Figure 4 This is a diagram showing the working state of this utility model at the injection station of an injection blow molding machine;

[0021] Figure 5 This is a diagram showing the working state of this utility model in the blow molding station of an injection blow hollow molding machine.

[0022] In the diagram: 1-Star nut, 2-Top rod screw, 3-Core rod moving rod, 4-Oil pipe, 5-Rod head compression spring, 6-Rod body, 7-Rod head positioning rod, 8-Rod head, 9-Large slide groove, 10-Medium slide groove, 11-Small slide groove, 12-Air inlet, 13-Liquid inlet, 14-Liquid outlet, 15-Allowing groove, 16-O-ring seal. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments:

[0024] refer to Figure 1-5 As shown, this utility model provides a temperature-controlled mandrel structure for an injection blow molding machine, comprising: a mandrel body 6, the mandrel body 6 having a stepped groove inside, a mandrel movable rod 3 slidably disposed inside the stepped groove, a stepped channel inside the mandrel movable rod 3, an oil pipe 4 and a mandrel head positioning rod 7 being threadedly connected inside the stepped channel, the mandrel head positioning rod 7 being sleeved on the outside of the oil pipe 4, and a mandrel head compression spring 5 being sleeved on the outside of the mandrel head positioning rod 7, the left end of the mandrel head compression spring 5 abutting against the right end of the mandrel movable rod 3, the right end of the mandrel head compression spring 5 abutting against the second step of the stepped groove, and a mandrel head 8 being connected to the right end of the mandrel head positioning rod 7. Specifically, the mandrel head positioning rod 7 and the mandrel head 8 are connected by threads or welding. It should be noted that a sealing gasket must be installed when using a threaded connection. A cooling circulation channel is formed between the stepped channel, the oil pipe 4, the mandrel head positioning rod 7 and the mandrel head 8. The temperature-controlled mandrel structure is fixed to the turret by a mandrel mounting base.

[0025] In a preferred embodiment, the stepped slide includes a large slide 9, a medium slide 10, and a small slide 11, wherein a first-level step is formed between the large slide 9 and the medium slide 10, and a second-level step is formed between the medium slide 10 and the small slide 11.

[0026] In a preferred embodiment, a limiting step is provided at the right end of the mandrel movable rod 3. The limiting step and the first-level step form a sliding limit, thereby limiting the opening size of the air outlet.

[0027] In a preferred embodiment, the mandrel movable rod 3 has an air inlet 12 inside. The air inlet 12 is connected to the machine's air blowing hole at its left end and to the middle sliding groove 10 at its right end. A first gap is formed between the rod body 6 and the rod head positioning rod 7. The air inlet 12, the middle sliding groove 10, and the first gap are connected in sequence to form a blow molding channel.

[0028] As a preferred embodiment, the stepped channel includes a small channel, a medium channel, and a large channel. The right end of the small channel is threadedly sealed to the left end of the oil pipe 4, and the right end of the large channel is threadedly sealed to the left end of the rod head positioning rod 7.

[0029] In a preferred embodiment, the mandrel movable rod 3 has a liquid inlet 13 and a liquid outlet 14. The liquid inlet 13 is connected to a small channel, and the liquid outlet 14 is connected to a middle channel. A second gap is formed between the oil pipe 4 and the mandrel head 8, and a third gap is formed between the mandrel head positioning rod 7 and the oil pipe 4. The liquid inlet 13, small channel, oil pipe 4, second gap, third gap, middle channel, and liquid outlet 14 are sequentially connected to form a cooling circulation channel. Preferably, a temperature sensor is installed on the inner wall of the mandrel head 8 (i.e., in the second gap). The temperature sensor is connected to the processor of the injection blow molding machine. The temperature sensor feeds back the temperature change of the mandrel head to the processor, which then controls the liquid medium in the cooling circulation channel to regulate the temperature. It should be noted that the mandrel head positioning rod 7 and the mandrel head 8 are connected by a thread to facilitate the maintenance of the temperature sensor later.

[0030] In a preferred embodiment, a clearance groove 15 is provided on the rod body 6 at the positions corresponding to the liquid inlet 13 and the liquid outlet 14.

[0031] In a preferred embodiment, the left end of the mandrel movable rod 3 is threadedly connected to a push rod screw 2, and the left end of the push rod screw 2 is connected to the top plate of the machine platform through a star nut 1.

[0032] In a preferred embodiment, two O-rings 16 are provided between the mandrel movable rod 3 and the rod body 6.

[0033] The working principle of this utility model is as follows:

[0034] During the injection station of the blow molding machine, the controllable liquid medium flows in through the inlet 13 on the mandrel moving rod 3, enters the second gap through the inner hole of the oil pipe 4, flows through the third gap and the middle channel, and then flows out through the outlet 14 to form a circuit.

[0035] During the injection stage of the blow molding machine, the compression spring 5 keeps the air outlet between the rod body 6 and the rod head 8 closed due to its elasticity. During the blow molding stage, the top plate of the machine pushes the ejector screw 2, the mandrel moving rod 3, the rod head positioning rod 7, and the rod head 8 to translate, thereby opening the air outlet between the rod body 6 and the rod head 8. High-pressure air enters from the air inlet 12 of the mandrel moving rod 3, flows through the middle sliding groove 10 and the first gap, and finally enters the preform to form the desired bottle shape.

[0036] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not 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 of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0037] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0038] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A temperature-controlled mandrel structure for an injection blow molding machine, characterized in that, include: The rod body (6) has a stepped groove inside. A mandrel movable rod (3) is slidably arranged inside the stepped groove. A stepped channel is opened inside the mandrel movable rod (3). An oil pipe (4) and a rod head positioning rod (7) are threadedly connected inside the stepped channel. The rod head positioning rod (7) is sleeved on the outside of the oil pipe (4). A rod head compression spring (5) is sleeved on the outside of the rod head positioning rod (7). The left end of the rod head compression spring (5) abuts against the right end of the mandrel movable rod (3). The right end of the rod head compression spring (5) abuts against the second step of the stepped groove. A rod head (8) is connected to the right end of the rod head positioning rod (7). A cooling circulation channel is formed between the stepped channel, the oil pipe (4), the rod head positioning rod (7), and the rod head (8).

2. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 1, characterized in that, The stepped slide includes a large slide (9), a medium slide (10) and a small slide (11). A first-level step is formed between the large slide (9) and the medium slide (10), and a second-level step is formed between the medium slide (10) and the small slide (11).

3. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 2, characterized in that, The right end of the mandrel movable rod (3) is provided with a limiting step, which forms a sliding limit with the first step.

4. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 2, characterized in that, An air inlet (12) is provided inside the movable rod (3) of the mandrel. The air inlet (12) is connected to the air blowing hole of the machine on the left end and to the middle sliding groove (10) on the right end. A first gap is formed between the rod body (6) and the rod head positioning rod (7). The air inlet (12), the middle sliding groove (10) and the first gap are connected in sequence to form a blow molding channel.

5. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 1, characterized in that, The stepped channel includes a small channel, a medium channel and a large channel. The right end of the small channel is threadedly sealed to the left end of the oil pipe (4), and the right end of the large channel is threadedly sealed to the left end of the rod head positioning rod (7).

6. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 5, characterized in that, The mandrel movable rod (3) is provided with an inlet (13) and an outlet (14). The inlet (13) is connected to the small channel, and the outlet (14) is connected to the middle channel. A second gap is formed between the oil pipe (4) and the rod head (8). A third gap is formed between the rod head positioning rod (7) and the oil pipe (4). The inlet (13), small channel, oil pipe (4), second gap, third gap, middle channel, and outlet (14) are connected in sequence to form a cooling circulation channel.

7. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 6, characterized in that, The rod (6) is provided with clearance grooves (15) at the positions corresponding to the liquid inlet (13) and the liquid outlet (14).

8. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 1, characterized in that, The left end of the mandrel movable rod (3) is threadedly connected to the top rod screw (2), and the left end of the top rod screw (2) is connected to the top plate of the machine platform through a star nut (1).

9. The temperature-controlled mandrel structure for an injection blow molding machine according to claim 1, characterized in that, Two O-rings (16) are provided between the mandrel movable rod (3) and the rod body (6).

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