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

Abstract

The invention discloses a temperature-controllable core rod structure of an injection blow molding machine, and belongs to the technical field of injection blow molding machines, the temperature-controllable core rod structure comprises a rod body, a stepped sliding groove is formed in the rod body, a core rod movable rod is arranged in the stepped sliding groove in a sliding manner, and a stepped channel is formed in the core rod movable rod; 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 in threaded connection 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. When an injection blow hollow forming machine injects a pipe blank at an injection station, a mold core rod is at a reasonable temperature, and the situation that the production efficiency is affected due to surface sticking after the temperature of the core rod is too high is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of injection blow molding machines, and in particular relates to a temperature-controllable core rod structure of an injection blow hollow molding machine. Background Art

[0002] In the blow molding of hollow plastic bodies, the blow mandrels used for this purpose must be kept at an optimum temperature for the process requirements. After starting the system, a balance should be established for each blow mandrel between the heat provided by the plastic injected onto the blow mandrel and the heat dissipated by the cooling effect of the surrounding air on the blow mandrel. However, a temperature suitable for blow molding only naturally establishes itself under appropriate conditions, but this condition cannot be reliably achieved because no adjustments can be made to ensure that the temperature of the blow mandrel is always kept within a suitable range, and it is obvious that this temperature will deviate from the suitable value when a fault occurs. Therefore, a temperature-controllable mandrel structure is urgently needed to solve the shortcomings existing in the prior art. Summary of the invention

[0003] The object of the present invention is to provide a temperature-controllable core rod structure for an injection blow molding machine to solve the deficiencies in the prior art.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is:

[0005] A temperature-controlled core rod structure for an injection blow molding machine comprises: a rod body, a stepped slide groove is provided inside the rod body, a core rod movable rod is slidably arranged inside the stepped slide groove, a stepped channel is provided inside the core rod movable rod, the stepped channel has an internal thread connected to an oil pipe and a rod head positioning rod, the rod head positioning rod is sleeved on the outside of the oil pipe, a rod head compression spring is sleeved on the outside of the rod head positioning rod, the left end of the rod head compression spring abuts against the right end of the core rod movable rod, the right end of the rod head compression spring abuts against the secondary step of the stepped slide groove, the right end of the rod head positioning rod is threadedly connected to the rod head, a cooling circulation channel is formed between the stepped channel, the oil pipe, the rod head positioning rod and the rod head, a temperature sensor is provided on the inner wall of the rod head, and the temperature sensor is electrically connected to a processor of the injection blow molding machine.

[0006] As a preferred embodiment, the stepped chute includes: a large chute, a middle chute and a small chute, a first step is formed between the large chute and the middle chute, and a second step is formed between the middle chute and the small chute.

[0007] As 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 primary step.

[0008] As a preferred embodiment, an air inlet hole is opened inside the core rod movable rod, the air inlet hole is connected to the machine blowing hole at the left end, the right end of the air inlet hole is connected to the middle slide groove, and a first gap is formed between the rod body and the rod head positioning rod, and the air inlet hole, the middle slide groove and the first gap are connected in sequence to form a blow molding channel.

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

[0010] As a preferred embodiment, a liquid inlet and a liquid outlet are provided on the core rod movable rod, the liquid inlet is connected with the small channel, the liquid outlet is connected with the middle channel, a second gap is formed between the oil pipe and the rod head, a third gap is formed between the rod head positioning rod and the oil pipe, and the liquid inlet, small channel, oil pipe, second gap, third gap, middle channel and liquid outlet are connected in sequence to form a cooling circulation channel.

[0011] As a preferred embodiment, avoidance grooves are provided on the rod body at positions corresponding to the liquid inlet and the liquid outlet.

[0012] As 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 machine table top plate through a star nut.

[0013] As a preferred embodiment, two O-rings are arranged between the core rod movable rod and the rod body.

[0014] The temperature-controllable core rod structure of an injection blow molding machine provided by the present invention has the following advantages compared with the prior art:

[0015] The invention mainly solves the problem of keeping the mold core rod at a reasonable temperature when the injection blow molding machine injects a tube blank at an injection station, so as to avoid the core rod being stuck to the surface due to excessive temperature, thereby affecting production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

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

[0018] Figure 2 A perspective view of the present invention;

[0019] Figure 3 is a cross-sectional view of a rod body of the present invention;

[0020] Figure 4 This is a working state diagram of the present invention at the injection station of the injection blow molding machine;

[0021] Figure 5 This is a working state diagram of the present invention at the blow molding station of the injection blow molding machine.

[0022] In the figure: 1-star nut, 2-top rod screw, 3-core rod movable 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-middle slide groove, 11-small slide groove, 12-air inlet, 13-liquid inlet, 14-liquid outlet, 15-avoidance groove, 16-O-ring. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0024] refer to Figure 1-5 As shown, the present invention provides a temperature-controlled core rod structure for an injection blow molding machine, comprising: a rod body 6, wherein a stepped chute is provided inside the rod body 6, a core rod movable rod 3 is slidably provided inside the stepped chute, a stepped channel is provided inside the core rod movable rod 3, an oil pipe 4 and a rod head positioning rod 7 are connected to the stepped channel through a thread, 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 core rod movable rod 3, the right end of the rod head compression spring 5 abuts against the secondary step of the stepped chute, and a rod head 8 is connected to the right end of the rod head positioning rod 7, specifically, the rod head positioning rod 7 and the rod head 8 are threadedly connected or welded, and it should be noted that a sealing gasket needs to be installed when threaded connection is adopted. 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. The temperature-controllable core rod structure is fixed on the turret through a core rod mounting seat.

[0025] As a preferred embodiment, the stepped chute includes: a large chute 9, a middle chute 10 and a small chute 11, a first step is formed between the large chute 9 and the middle chute 10, and a second step is formed between the middle chute 10 and the small chute 11.

[0026] As a preferred embodiment, a limiting step is provided at the right end of the mandrel movable rod 3, and the limiting step forms a sliding limit with the first step, thereby limiting the opening size of the air outlet.

[0027] As a preferred embodiment, an air inlet hole 12 is opened inside the core rod movable rod 3, and the air inlet hole 12 is connected to the blowing hole of the machine at the left end, and the right end of the air inlet hole 12 is connected to the middle slide groove 10. A first gap is formed between the rod body 6 and the rod head positioning rod 7, and the air inlet hole 12, the middle slide 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 middle 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] As a preferred embodiment, the mandrel movable rod 3 is provided with a liquid inlet 13 and a liquid outlet 14, the liquid inlet 13 is connected to the small channel, the liquid 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 liquid inlet 13, the small channel, the oil pipe 4, the second gap, the third gap, the middle channel, and the liquid outlet 14 are sequentially connected to form a cooling circulation channel. Preferably, a temperature sensor is provided on the inner wall of the rod head 8 (i.e., in the second gap), the temperature sensor is connected to the processor of the injection blow molding machine, and the temperature change of the rod head is fed back to the processor through the temperature sensor, and then the processor controls the liquid medium in the cooling circulation channel to adjust the temperature. It should be noted that the rod head positioning rod 7 and the rod head 8 are threadedly connected to facilitate the maintenance of the temperature sensor at a later stage.

[0030] As a preferred embodiment, avoidance grooves 15 are provided on the rod body 6 at positions corresponding to the liquid inlet 13 and the liquid outlet 14 .

[0031] As 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 machine top plate through a star nut 1.

[0032] As 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 the present invention is:

[0034] At the injection station of the injection blow molding machine, the controllable liquid medium flows in through the liquid inlet 13 on the core rod movable 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 flows out from the liquid outlet 14 to form a loop.

[0035] At the injection station of the injection blow molding machine, the rod head compression spring 5 makes the air outlet between the rod body 6 and the rod head 8 in a closed state through elasticity. At the blow molding station of the injection blow molding machine, the top plate of the machine pushes the top rod screw 2 and the core rod movable rod 3 and the rod head positioning rod 7 and the rod head 8 to move horizontally, so that the air outlet between the rod body 6 and the rod head 8 is opened, and the high-pressure gas enters from the air inlet 12 of the core rod movable rod 3, flows through the middle slide 10 and the first gap, and finally enters the tube blank to form the required bottle sample.

[0036] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0038] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A temperature-controllable core rod structure for an injection blow molding machine, characterized in that: include: The rod body (6) is provided with a stepped slide groove inside, a mandrel movable rod (3) is slidably arranged inside the stepped slide groove, a stepped channel is provided inside the mandrel movable rod (3), the stepped channel is internally threadedly connected to an oil pipe (4) and a rod head positioning rod (7), the rod head positioning rod (7) is sleeved on the outside of the oil pipe (4), the rod head positioning rod (7) is sleeved on the outside of the rod head compression spring (5), the rod head compression spring (5) is sleeved on the outside of the rod head positioning rod (7), and the rod head compression spring (5) is sleeved on the outside of the rod head positioning rod (7). The left end of the spring (5) abuts against the right end of the core rod movable rod (3), the right end of the rod head compression spring (5) abuts against the secondary step of the stepped slide groove, the right end of the rod head positioning rod (7) is threadedly connected to the rod head (8), and 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), and a temperature sensor is arranged on the inner wall of the rod head (8), and the temperature sensor is electrically connected to the processor of the injection blow molding machine.

2. The temperature controllable core rod structure of the injection blow molding machine according to claim 1, characterized in that: The stepped chute comprises: a large chute (9), a middle chute (10) and a small chute (11); a first step is formed between the large chute (9) and the middle chute (10); and a second step is formed between the middle chute (10) and the small chute (11).

3. The temperature controllable core rod structure of the injection blow molding machine according to claim 2, characterized in that: A limit step is arranged at the right end of the mandrel movable rod (3), and the limit step forms a sliding limit with the primary step.

4. The temperature controllable core rod structure of the injection blow molding machine according to claim 2, characterized in that: An air inlet hole (12) is provided inside the core rod movable rod (3), the air inlet hole (12) is connected to the machine blow hole at the left end, the air inlet hole (12) is connected to the middle slide groove (10) at the right end, a first gap is formed between the rod body (6) and the rod head positioning rod (7), and the air inlet hole (12), the middle slide groove (10) and the first gap are connected in sequence to form a blow molding channel.

5. The temperature controllable core rod structure of the injection blow molding machine according to claim 1, characterized in that: The stepped channel comprises a small channel, a middle 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 controllable core rod structure of the injection blow molding machine according to claim 5, characterized in that: The mandrel movable rod (3) is provided with a liquid inlet (13) and a liquid outlet (14); the liquid inlet (13) is connected to the small channel, the liquid 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), and the liquid inlet (13), the small channel, the oil pipe (4), the second gap, the third gap, the middle channel, and the liquid outlet (14) are sequentially connected to form a cooling circulation channel.

7. The temperature controllable core rod structure of the injection blow molding machine according to claim 6, characterized in that: The rod body (6) is provided with avoidance grooves (15) at positions corresponding to the liquid inlet (13) and the liquid outlet (14).

8. The temperature controllable core rod structure of the injection blow molding machine according to claim 1, characterized in that: 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 machine table top plate via a star nut (1).

9. The temperature controllable core rod structure of the injection blow molding machine according to claim 1, characterized in that: Two O-shaped sealing rings (16) are arranged between the mandrel movable rod (3) and the rod body (6).

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