WO2023035419A1

WO2023035419A1 - Cooling nozzle structure suitable for multi-cavity mold

Info

Publication number: WO2023035419A1
Application number: PCT/CN2021/133326
Authority: WO
Inventors: 梁正华; 梁凯; 林连明; 王华良
Original assignee: 浙江凯华模具有限公司
Priority date: 2021-09-10
Filing date: 2021-11-26
Publication date: 2023-03-16
Also published as: CN113858550A

Abstract

Disclosed is a cooling nozzle structure suitable for a multi-cavity mold, each cavity of the multi-cavity mold being internally provided with a mold core, and the mold cores each being internally provided with a mold core cavity; each mold core is provided with an independent cooling nozzle structure; the cooling nozzle structures comprise insert blocks that are sealingly connected to the mold core cavities and nozzles that communicate with the interior of the insert blocks; the interior of the insert blocks is provided with mixing cavities and return channels that communicate the mold core cavities and the mixing cavities; the mixing cavities extend upwards to form nozzle channels; nozzles are provided in the nozzle channels and extend upwards for insertion into the mold core cavities; pressure relief valves are provided at the joints of the nozzle channels and the mixing cavities; side walls of the nozzle channels above the pressure relief valves are provided with water intake channels, and positions of the mixing cavities near the bottom portions are provided with water outlet channels and temperature control valves that control the on and off of the water outlet channels. By using the independent cooling nozzle structures and integrated insert blocks, cooling liquid of a low temperature can be recycled and reused, thereby improving the cooling efficiency of the cooling liquid.

Description

A Cooling Nozzle Structure Suitable for One Mold and Multiple Cavities Mold

technical field

The invention relates to the technical field of moulds, in particular to a cooling nozzle structure suitable for a multi-cavity mould.

Background technique

In the process of using injection molds for production, cooling is a very important step, which has an extremely important impact on the production efficiency and qualification rate of the product. For injection molding of small parts, such as medical treatment, bottle caps, food packaging, etc., it is often necessary to use a mold core structure in the mold, and the mold core structure is often small, so it is now widely used to extend the nozzle into the opening of the mold core for spraying. Drain to cool. In addition, for small parts like bottle caps, one-mold and multi-cavity molds are often used for production, so the demand for cooling liquid is relatively large, and high-quality cooling liquid needs to be recycled, so improving the use efficiency of cooling liquid is important for energy saving. Emission reduction has great significance.

Because the cooling nozzle needs to be installed in advance, for this reason, the existing nozzle cooling structure, for example, a kind of "nozzle disassembly structure and injection mold cooling system" disclosed in the Chinese patent literature, its notification number CN204036785U, includes A nozzle with a through hole and a nozzle connection insert, the interior of the nozzle connection insert has an interconnected installation through hole and a disassembly through hole with internal threads, the installation through hole is located at the center of the disassembly through hole Above, the inner diameter of the installation through hole is larger than the inner diameter of the disassembly through hole, the bottom of the nozzle is fixedly installed in the installation through hole, the middle through hole of the nozzle is connected with the installation through hole, and the problem of difficult assembly is improved by setting inserts. The problem is that the assembly efficiency is improved, but the cooling efficiency has not been improved in the prior art.

Contents of the invention

The purpose of the present invention is to solve the problems of the existing nozzle cooling device, especially the nozzle cooling device applied to a multi-cavity mold, with complex structure, inconvenient installation, and low cooling efficiency, and provide a simple structure, It is easy to install and has high cooling efficiency, which is suitable for the cooling nozzle structure of a multi-cavity mold.

The present invention is achieved through the following technical solutions: a cooling nozzle structure suitable for a multi-cavity mold, a mold core is provided in each cavity of a multi-cavity mold, and a core cavity is provided in the mold core, Each mold core is provided with an independent cooling nozzle structure, and the cooling nozzle structure includes an insert sealed with the mold core cavity and a nozzle communicated with the inside of the insert, and the inside of the insert is provided with a mixing The cavity and the return passage connecting the mold core cavity and the mixing cavity, the mixing cavity extends upwards to form a nozzle channel, the nozzle is arranged in the nozzle channel and extends upwards to be inserted into the mold core cavity, the nozzle A pressure relief valve is provided at the connection between the pipe channel and the mixing chamber, and a water inlet channel is provided on the side wall of the nozzle channel above the pressure relief valve, and a water outlet channel and a switch for controlling the on-off of the water outlet channel are provided near the bottom of the mixing chamber. Temperature control valve.

The cooling nozzle structure suitable for one-mold multi-cavity mold, by setting an independent cooling nozzle structure in each mold core, realizes the overall cooling of the whole mold while realizing the cooling of each mold core, specifically Each set of cooling nozzle structure includes an integrated insert and a nozzle. A mixing chamber is integrated inside the insert. The mixing chamber extends upwards to form a nozzle channel. There is a pressure relief valve at the connection between the nozzle channel and the mixing chamber. A water inlet channel is provided on the side wall of the nozzle channel above the pressure relief valve to facilitate the external coolant to enter the nozzle channel, and at the same time, a water outlet channel and a temperature control for controlling the on-off of the water outlet channel are integrated inside the mixing chamber valve. When installing, install the nozzle on the insert, then insert the nozzle into the cavity of the mold core, and then complete the installation by fixing the insert with the mold core; After the pipe channel enters the nozzle, it sprays into the core cavity of the mold, and flows into the mixing cavity through the return channel. If the temperature of the cooling liquid in the mixing cavity is lower than the setting value of the temperature control valve, it will accumulate in the mixing cavity. When the pressure is greater than the pressure relief When the valve threshold is reached, the pressure relief valve opens, and the coolant will enter the nozzle channel and mix with the coolant in the water inlet channel for spraying together. During this process, if the temperature of the coolant is higher than the set value of the temperature control valve, Then the temperature control valve is opened, and the coolant flows out from the water outlet channel, so that the pressure in the mixing chamber is reduced, and the pressure relief valve is closed. Independent cooling nozzle structure, integrated insert, compact structure, convenient and quick installation; a mixing chamber is integrated in the insert, and a temperature control valve is set in the water outlet channel, and a pressure relief valve is set in the nozzle channel to control the temperature. The lower coolant is recycled and reused, which improves the cooling efficiency of the coolant.

Preferably, the temperature control valve includes a valve seat, the valve seat is arranged in the mixing chamber, a temperature bulb is arranged laterally on one side of the valve seat, one end of the temperature bulb is connected to the valve seat through a spring, and the other end of the temperature bulb is connected to a conical valve. The water outlet channel is provided with a valve port in the shape of a circular platform matched with the valve, and the valve is movable inside the valve port. When the temperature of the coolant rises and the temperature bulb expands, the valve can be stretched open, and the coolant can flow out from the valve port; accumulation in the cavity.

As a preference, a rotating shaft is rotatably connected to the water outlet channel, and a pull rope is provided on the side of the valve away from the valve seat, and the other end of the stay rope passes through the side wall of the water outlet channel, is wound on the rotating shaft, and is rotated by rotating the rotating shaft. The pull cord can be pulled to adjust the threshold of the thermostatic valve by adjusting the starting position of the valve.

As a preference, the end of the nozzle is provided with a number of top joints, and the top joints abut against the core cavity of the mold, and the nozzle can be kept at the center of the core cavity of the mold during the process of inserting the nozzle into the core cavity , to avoid uneven cooling or damage to the nozzle due to the inclination of the nozzle.

Preferably, the nozzle and the insert are connected by threads, and the insert and the mold core are connected by threads, so that the installation is convenient and the sealing performance is improved at the same time.

Preferably, a sealing groove is provided on the surface of the insert that abuts against the bottom surface of the mold core, and a sealing member is provided inside the sealing groove. Avoid direct flow of coolant from the core cavity to the outside of the insert.

As a preference, the water inlet channel is arranged along the radial direction of the insert, the return channel is arranged along the axial direction of the insert, and the return channel and the water inlet channel are located at different circumferential positions of the insert, so as to avoid the return channel and the water inlet channels interfere with each other.

Preferably, the water inlet channel is located above the mixing chamber, and the water inlet channel directly passes through the insert and enters the nozzle channel without providing a pipe for the water inlet channel in the mixing chamber, thereby improving the structural strength of the insert.

Therefore, the present invention has the following beneficial effects: the cooling nozzle structure suitable for a multi-cavity mold, each mold core adopts an independent cooling nozzle structure, integrated inserts, compact structure, convenient and quick installation; A mixing chamber is integrated in the insert, and a temperature control valve is set in the water outlet channel, and a pressure relief valve is set in the nozzle channel, which can recycle the lower temperature coolant and improve the cooling efficiency of the coolant.

Description of drawings

Fig. 1 is a schematic sectional view of Embodiment 1 of the present invention;

Fig. 2 is the A-A direction sectional schematic view of embodiment 1 of the present invention;

Fig. 3 is the enlarged schematic diagram of part B in Fig. 2;

Fig. 4 is the schematic diagram that the present invention is applied in a multi-cavity mould;

Fig. 5 is a schematic perspective view of an insert and a nozzle in Embodiment 1 of the present invention.

In the figure: 1 nozzle, 11 top joint, 2 mold core, 21 mold core cavity, 3 insert, 31 mixing cavity, 32 return channel, 33 nozzle channel, 331 pressure relief valve, 34 water inlet channel, 35 water outlet Channel, 36 sealing grooves, 4 temperature control valves, 41 valve seats, 42 temperature bulbs, 43 valves, 44 valve ports, 5 rotating shafts, 6 pull ropes, 7 seals, 8, moulds.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", The orientation or positional relationship indicated by "outside" is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Constructed and operative in a particular orientation and therefore are not to be construed as limitations of the invention.

Embodiment 1, as shown in Figure 1, Figure 2, Figure 3 and Figure 5, a cooling nozzle structure suitable for a multi-cavity mold includes a mold 8 and a nozzle 1, and the mold 8 includes a core 2. There is a mold core cavity 21 for installing the nozzle 1 inside the mold core 2, a highly integrated insert 3 is connected to the bottom of the nozzle 1, and a mixing chamber 31 is provided inside the insert 3, and the insert 3 is provided with two The return channel 32 is used to communicate with the mixing chamber 31 and the core cavity 21, the mixing chamber 31 extends upwards to form a nozzle channel 33, the mixing chamber 31 communicates with the nozzle 1 through the nozzle channel 33, and a pressure relief valve is arranged in the nozzle channel 33 331, the pressure relief valve 331 is set at the position where the nozzle channel communicates with the mixing chamber, the side wall of the nozzle channel 33 is provided with a water inlet channel 34 that communicates with the inside of the nozzle channel 33, and the setting position of the water inlet channel 34 is higher than the pressure relief valve. Where the valve 331 is located, and the water inlet channel 34 communicates with the outside of the insert 3 , the position near the bottom of the mixing chamber 31 is provided with a water outlet channel 35 connected to the outside of the insert, and the water outlet channel 35 is provided with a temperature control valve 4 .

As shown in Figure 3, the temperature control valve 4 includes a valve seat 41, the valve seat 41 is arranged in the mixing chamber 31 outside the water outlet channel 35, a temperature bulb 42 is arranged laterally on the side of the valve seat 41 facing the water outlet channel 35, the temperature bulb 42 One end is connected to the valve seat 41 through a spring, and the other end of the temperature bulb is connected to a disc-shaped valve 43. The inlet end of the water outlet channel 35 is provided with a disc-shaped valve port 44 matching the valve 43, and the valve 43 is movably set at the valve port 44. Inside, when the temperature of the cooling liquid rises, the temperature bulb 42 expands and drives the valve 43 to separate from the valve port 44 and slide toward the inside of the water outlet channel 35, then the valve 43 can be opened, and the cooling liquid can enter the water outlet channel 35 from the valve port 44 and then flow out ; When the temperature of the cooling liquid decreases, the temperature bulb 42 shrinks, and the temperature bulb drives the valve 43 to return, then the valve 43 blocks the valve port 44 again, so that the coolant accumulates in the mixing chamber 31 .

During use, the cooling liquid is introduced through the water inlet passage 34, the cooling liquid enters the nozzle pipe 1 through the nozzle passage 33 and is sprayed into the core cavity 21, and flows into the mixing chamber 31 through the return passage 32, and the cooling liquid in the mixing chamber 31 if If the temperature is lower than the set value of the temperature control valve 4, it will accumulate in the mixing chamber 31. When the water pressure is greater than the threshold of the pressure relief valve 331, the pressure relief valve 331 will open, and the coolant will enter the nozzle channel 33 and the water inlet channel. The coolant in 34 is mixed and then enters the nozzle 1 for spraying together. During this process, if the temperature of the coolant is higher than the set value of the temperature control valve 4, the temperature control valve is opened, and the coolant flows out from the water outlet channel 35, and the mixing chamber The water pressure in 31 decreases, and the water pressure decreases below the threshold value, then the pressure relief valve 331 is closed.

As shown in Figure 3, the water outlet channel 35 is rotatably connected with a rotating shaft 5, and the side of the valve 43 away from the valve seat 41 is provided with a pull rope 6, and the other end of the stay rope 6 passes through the side wall of the water outlet channel 35 and is wound around the rotating shaft. On the rod 5, the pull rope 6 can be pulled by rotating the rotating shaft rod 5, thereby adjusting the threshold value of the temperature control valve 4 by adjusting the initial position of the valve 43, that is, when the valve 43 is pulled to the left, the temperature bulb 42 can be adjusted at a higher temperature. When the temperature is low, the valve 43 is kept closed, that is, the threshold is lowered, and vice versa. In addition, when continuous rapid cooling is required, the valve 43 can be pulled to the left to the maximum to continuously discharge the coolant.

Nozzle 1 and insert 3 are connected by thread, insert 3 and mold core 2 are connected by thread, and the injection end of nozzle 1 is provided with two arc-shaped top joints 11, one end of the top joint is connected with the nozzle, and the top The other end of the tab abuts against the cavity 21 of the mold core to limit the position of the nozzle. The top tab 11 can keep the nozzle at the center of the core cavity at all times, avoiding poor cooling caused by the inclination of the nozzle 1. Uniformity or damage to the nozzle, since the top joint 11 adopts a narrow arc-shaped piece, the area of the top joint 11 is small, which will not affect the uniformity of cooling and heat dissipation.

A sealing groove 36 is provided on the surface of the insert 3 abutting against the bottom surface of the mold core 2, and a sealing member 7 is arranged in the sealing groove. When installing, install the nozzle 1 on the insert 3, then insert the nozzle 1 into the core cavity 21 of the mold, the top joint 11 can keep the nozzle always in the center of the cavity of the mold, and rotate the insert so that the insert The installation can be completed through threaded connection with the mold core. Since the top joint is provided at the end of the nozzle, the top joint is always in contact with the inner wall of the mold core cavity during the rotation installation process of the insert, thus ensuring The nozzle is always in the center of the mold core cavity, which can avoid uneven cooling or damage to the nozzle due to the inclination of the nozzle. The area of the top joint is small, which will not affect the uniformity of heat dissipation, and the sealing is good to avoid cooling The liquid flows directly from the mold core cavity to the outside of the insert.

The water inlet channel is arranged along the radial direction of the insert, and the return channel is arranged along the axial direction of the insert, and the return channel 32 and the water inlet channel 34 are located at different circumferential positions of the insert, so as to avoid that the return channel 32 and the water inlet channel 34 interfere with each other. The water inlet channel 34 is located above the mixing chamber 21, and the water inlet channel 34 directly passes through the insert and enters the nozzle channel without the need to set a pipe for the water inlet channel 34 in the mixing chamber, which improves the structural strength of the insert 2 .

As shown in Figure 4, due to the high integration of the insert 3, the insert 3 can be placed in each mold core of a multi-cavity mold to cool each mold core, and the product is between the mold core and the mold. The water inlet pipe connects each water inlet channel, and the water outlet pipe connects each water outlet channel. The cooling liquid of the cooling nozzle in each mold core can be recovered separately and recycled. Since each mold core can be independently Cooling, thus effectively improving the cooling efficiency.

In summary, in the present invention, the insert and the nozzle, and the insert and the mold core are connected by threads, which is convenient for installation; by setting a mixing chamber, setting a temperature control valve in the water outlet channel, and setting a pressure relief valve in the nozzle channel, it can The lower temperature coolant is recycled and reused to improve the cooling efficiency of the coolant; the temperature control valve is set to stretch, which can adjust the threshold of the temperature control valve and at the same time perform rapid cooling without recovery cooling mode, which has good adaptability.

Claims

A cooling nozzle structure suitable for a multi-cavity mold. Each cavity of a multi-cavity mold is provided with a mold core (2), and a mold core cavity (21) is provided in the mold core (2). It is characterized in that each mold core (2) is provided with an independent cooling nozzle structure, and the cooling nozzle structure includes an integrated insert (3) sealingly connected with the mold core cavity (21) and an insert ( 3) The nozzle pipe (1) connected internally, the insert (3) is internally provided with a mixing chamber (31) and a return channel (32) connecting the die cavity (21) and the mixing chamber (31), the The mixing chamber (31) extends upwards to form a nozzle channel (33), the nozzle tube (1) is arranged in the nozzle channel (33) and extends upwards to be inserted into the mold core cavity (21), the described A pressure relief valve (331) is provided at the junction of the nozzle channel (33) and the mixing chamber (31), and a water inlet channel (34) is provided on the side wall of the nozzle channel (33) above the pressure relief valve (331). The position near the bottom of the mixing chamber (31) is provided with a water outlet channel (35) and a temperature control valve (4) for controlling the on-off of the water outlet channel.
The cooling nozzle structure suitable for a multi-cavity mold according to claim 1, characterized in that: the temperature control valve (4) includes a valve seat (41), and the valve seat (41) is arranged in the mixing chamber (31 ), a temperature bulb (42) is arranged horizontally on one side of the valve seat (41), one end of the temperature bulb (42) is connected to the valve seat (41) through a spring, and the other end of the temperature bulb (42) is connected to a round table-shaped valve (43) , the water outlet channel (35) is provided with a conical valve port (44) matched with the valve (43), and the valve (43) is movably arranged inside the valve port (44).
The cooling nozzle structure suitable for a multi-cavity mold according to claim 2, characterized in that: a rotating shaft (5) is rotatably connected to the water outlet channel (35), and the valve (43) is far away from the valve seat ( 41) One side is provided with a stay rope (6), and the other end of the stay rope (6) passes through the side wall of the water outlet channel (35) and is wound on the rotating shaft (5).
According to claim 1, 2 or 3, the cooling nozzle structure suitable for a multi-cavity mold is characterized in that: the end of the nozzle (1) is provided with several top joints (11), the top joints (11) abuts in the mold core cavity (21).
According to claim 1, 2 or 3, the cooling nozzle structure suitable for a multi-cavity mold is characterized in that: the nozzle (1) and the insert (3) are connected by threads, and the insert (3) It is connected with the mold core (2) by threads.
According to claim 1, 2 or 3, the cooling nozzle structure suitable for a mold with multiple cavities is characterized in that: the mating surface of the insert (3) and the bottom surface of the mold core (2) is provided with A sealing groove (36), the sealing element (7) is arranged inside the sealing groove (36).
According to claim 1, 2 or 3, the cooling nozzle structure suitable for a mold with multiple cavities is characterized in that: the water inlet channel (34) is arranged along the radial direction of the insert (3), and the return channel ( 32) is arranged along the axial direction of the insert (3), and the return channel (32) and the water inlet channel (34) are located at different circumferential positions of the insert (3).
The cooling nozzle structure suitable for a multi-cavity mold according to claim 1, 2 or 3, characterized in that: the water inlet channel (34) is located above the mixing chamber (31).