Injection mold core

Abstract

The utility model discloses an injection mold core which comprises a body, an air path penetrates through the body, a first air opening and a second air opening are formed in the two ends, penetrating out of the body, of the air path respectively, the first air opening is used for being connected with an air pump, and a stainless steel insert abuts against the end face of the body and covers the second air opening. A sensor used for detecting the installation position of the stainless steel insert is arranged on the end face, abutting against the stainless steel insert, of the body. The stainless steel insert is adsorbed to the end face of the body through the air path, the position of the stainless steel insert is detected through the sensor, deviation of the stainless steel insert is effectively prevented, and the injection molding quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mold cores, and more specifically to an injection mold core. Background Art

[0002] The mold core plays a key role in mold design. Its reasonable design can greatly improve product quality and production efficiency. In the design process of the mold core, many factors need to be considered, including the material, shape and size of the product, as well as the cost of mold production and the production capacity of the machine equipment. The size and shape of the mold core must strictly meet the design requirements, otherwise it may cause product quality problems and mold damage.

[0003] At present, domestic and foreign PPR injection molding pipe fittings with copper inserts are basically placed on the mold core of the injection molding machine and then injection molded. The disadvantage is that the copper parts contain lead and the cost is high, so the copper inserts are often replaced with stainless steel inserts.

[0004] In the production of PPR pipe fittings, the stainless steel inserts are put on the core manually semi-automatically or by a robot, and then injection molded. When the sets are put on manually, they may not be put into place, or due to problems with the processing technology, the inner diameters of the stainless steel inserts are not completely consistent, and there will be slight differences. At this time, the contact position with the core will be loose, and the stainless steel insert will loosen forward when the mold is closed. At this time, the hardness of the stainless steel insert is greater than that of the core when the mold is closed, which will damage the core and affect production.

[0005] Prior art CN213107997U discloses a new structure of a core of a mold for an injection molded pipe fitting with an insert. The new structure of a core of a mold for an injection molded pipe fitting with an insert comprises: a front mold and a rear mold, wherein the front mold is provided with a cavity corresponding to the outer surface of the injection molded pipe fitting, and the rear mold is provided with a core corresponding to the inner surface of the injection molded pipe fitting, and the cavity and the core cooperate to form a space for molding the injection molded pipe fitting, and the front mold is also provided with a core for connecting the insert, and the core comprises a first section connected and fixed to the front mold, and a second section corresponding to the inner surface of the insert, and the first section is connected and fixed to the second section. The core of the utility model has a first section and a second section, and the first section is connected and fixed to the second section. Since only the second section is in contact with the insert, when the core is worn during the matching and production process, only the second section of the core needs to be replaced, but this technical solution cannot solve the problem of loose inserts. Utility Model Content

[0006] In order to solve the above problems, the utility model proposes an injection mold core. The core is convenient for cooperating with an air pump to adsorb stainless steel inserts to ensure that they are firmly connected. At the same time, a sensor is used to detect the installation position of the stainless steel inserts and to detect in real time whether the stainless steel inserts are loose, thereby ensuring the production quality of injection molded pipe fittings.

[0007] To achieve the above-mentioned purpose, the main body is penetrated by an air path, and the air path passes through the two ends of the main body to form a first air outlet and a second air outlet respectively. The first air outlet is used to connect with the air pump, and the stainless steel insert abuts against the end face of the main body and covers the second air outlet. The main body is provided with a sensor for detecting the installation position of the stainless steel insert on the end face abutting against the stainless steel insert.

[0008] In the present technical solution, before mold closing, the first air inlet is connected to the air pump, the stainless steel insert is mounted on the main body, the air pump is started to inhale air, the air path forms a negative pressure, and the second air inlet adsorbs the end face of the stainless steel insert. At this time, the sensor detects that the stainless steel insert has been installed in place, and then the mold can be closed and injection molding can be carried out. In the above process, the sensor on the end face detects in real time whether the stainless steel insert is loose and deviated, thereby ensuring the injection molding quality of the injection molded pipe fittings. When the injection molding is completed and the mold is opened, the air pump is started to blow air, the stainless steel insert is separated from the step surface, and the air flow is blown to the inside of the mold through the second air inlet for cooling.

[0009] As a preferred solution, in order to better fit the end face of the stainless steel insert, the main body includes a first shaft segment and a second shaft segment that are coaxially connected, and a step surface is formed at the connection between the first shaft segment and the second shaft segment. The step surface is adapted to the end face of the stainless steel insert, and the stainless steel insert is sleeved on the second shaft segment and one end thereof abuts against the step surface. The second air outlet is arranged on the step surface. When negative pressure is formed in the air path, the stainless steel insert is adsorbed onto the step surface, which can effectively prevent the stainless steel insert from loosening and deviating during the mold closing and injection molding process.

[0010] As a preferred solution, in order to better adsorb the stainless steel inlay, an annular groove is provided on the step surface, and the second air outlet is connected to the annular groove. When the stainless steel inlay covers the step surface, the air path and the annular groove form a sealed environment. When the air path is in a negative pressure state, the annular groove can generate uniform suction to adsorb the stainless steel inlay, thereby further ensuring the reliability of the installation of the stainless steel inlay.

[0011] As a preferred solution, in order to ensure that the stainless steel insert is subjected to balanced force when being adsorbed, two air passages are provided, and the two air passages are symmetrically arranged about the axis of the first shaft segment.

[0012] As a preferred solution, in order to ensure the air tightness of the connection between the air pump and the first air outlet, the end surface of the body is provided with a first sealing groove at the outer peripheral position of the first air outlet, and a first sealing member is embedded in the first sealing groove.

[0013] As a preferred solution, in order to ensure that the step surface is flat so as to better fit the end surface of the stainless steel insert, the step surface is recessed inward to form a mounting position for the sensor to be embedded in, and the sensor is embedded in the mounting position and the end surface of the sensor is flush with the step surface.

[0014] As a preferred solution, in order to fully cool the plastic pipe after injection molding, a water channel runs through the first shaft segment, and the water channel is arranged along the axis of the first shaft segment. One end of the water channel forms a water channel opening at the position where it penetrates into the first shaft segment, and the other end of the water channel passes through the first shaft segment and penetrates into the second shaft segment. A second sealing groove is provided on the end face of the first shaft segment and at the water channel opening. A second sealing component is embedded in the second sealing groove. The second sealing component is used to seal the water channel to prevent water leakage.

[0015] As a preferred solution, the water channel in the first shaft segment is provided with a water baffle, which is arranged along the axis of the first shaft segment and the two sides of the water baffle are connected to the inner wall of the first shaft segment to divide the water channel in the first shaft segment into two parts. The water baffle is used to divide the water channel into two parts, and at the same time divide the water channel opening into a water inlet and a water outlet. During the cooling process, the water inlet end is connected to the water inlet, and the water outlet end is connected to the water outlet. Since the water baffle does not extend to the second shaft segment, the water channels in the first shaft segment and the second shaft segment can form a loop to fully cool the mold core and stainless steel inserts.

[0016] As a preferred solution, in order to form a hollow structure inside the plastic pipe, a third shaft segment is coaxially connected to the end surface of the second shaft segment away from the first shaft segment, and the structure of the third shaft segment is adapted to the inner core structure of the injection molded part.

[0017] As a preferred solution, the water channel runs through the second shaft segment and penetrates into one end of the third shaft segment to cool the third shaft segment.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The mold core of the utility model adsorbs the stainless steel insert on the end surface through the air path. The stainless steel insert does not loosen during the movement of the core, thereby ensuring the injection molding quality.

[0020] 2. Use the sensor on the end face of the body to detect whether the stainless steel insert is installed in place.

[0021] 3. When the mold is opened, cooling air is transported into the mold through the air duct to further cool the injection molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the injection mold core of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the end face where the first air outlet of the mold core is located;

[0024] Figure 3 It is a structural schematic diagram of the end face of the mold core where the second air outlet is located.

[0025] In the figure: first shaft section 1; air path 101; first air outlet 102; second air outlet 103; step surface 104; annular groove 105; first sealing groove 106; water path 107; water barrier 108; second sealing groove 109; second shaft section 2; third shaft section 3; sensor 4. DETAILED DESCRIPTION

[0026] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0027] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0028] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0029] Embodiment 1:

[0030] like Figures 1 to 3 An injection mold core is shown, including a main body, wherein the main body is penetrated by an air path 101, and the air path 101 passes through the two ends of the main body to form a first air port 102 and a second air port 103 respectively, wherein the first air port 102 is used to connect to an air pump, and a stainless steel insert abuts against the end face of the main body and covers the second air port 103.

[0031] In this embodiment, the air path 101 is parallel to the axial direction of the main body, the end face of the stainless steel insert is an annular face, and the end face of the main body is tightly fitted with the end face of the stainless steel insert. Before mold closing, the stainless steel insert is installed on the end face of the main body, and the air pump is connected to the first air port 102 and starts the suction function. Negative pressure is formed inside the air path 101, and the second air port 103 generates a strong suction force to tightly adsorb the stainless steel insert on the end face of the main body, which can effectively prevent the vibration during mold closing from causing the stainless steel insert to loosen and shift the installation position, thereby ensuring the injection molding quality. When opening the mold, the air pump starts the blowing function to blow cold air through the air path 101 to the second air port 103, which can better discharge the hot air in the mold and improve the cooling efficiency.

[0032] In this embodiment, the main body is made of mold steel, which is widely used in the production of high-precision, large-size, and long-life molds due to its high hardness, high strength, and good wear resistance. Commonly used steel grades include: P20, 718, 738, etc.

[0033] Specifically, the main body includes a first shaft segment 1 and a second shaft segment 2 that are coaxially connected, and a step surface 104 is formed at the connection between the first shaft segment 1 and the second shaft segment 2. The step surface 104 is adapted to the end surface of the stainless steel insert. The stainless steel insert is sleeved on the second shaft segment 2 and one end thereof abuts against the step surface 104. The second air outlet 103 is arranged on the step surface 104. The second shaft segment 2 is coaxially connected to a third shaft segment 3 on the end surface away from the first shaft segment 1, and the structure of the third shaft segment 3 is adapted to the inner core structure of the injection molded part.

[0034] In this embodiment, the first shaft segment 1 , the second shaft segment 2 and the third shaft segment 3 are integrally formed and processed by a lathe, thereby ensuring the structural strength of the mold core. The step surface 104 is perpendicular to the axial direction of the first shaft segment 1 .

[0035] Specifically, two air passages 101 are provided, and the two air passages 101 are symmetrically arranged with respect to the axis of the first shaft segment 1 .

[0036] In this embodiment, the air pump is connected to the first air ports 102 of the two air paths 101 through two air pipes. During the air intake stage, it can ensure that the stainless steel insert is subjected to balanced force when being adsorbed and is not prone to loosening.

[0037] Specifically, a first sealing groove 106 is provided on the end surface of the body at a peripheral position of the first air outlet 102 , and a first sealing member is embedded in the first sealing groove 106 .

[0038] In this embodiment, the first sealing groove 106 is annular, and the first sealing groove 106 encloses the two first air ports 102 to ensure the air tightness of the air pump connection, thereby ensuring the adsorption force on the stainless steel insert.

[0039] Specifically, a water channel 107 runs through the first shaft segment 1 and the second shaft segment 2. The water channel 107 is arranged along the axis of the first shaft segment 1. One end of the water channel 107 forms a water channel opening at the position where it penetrates into the first shaft segment 1, and the other end of the water channel 107 passes through the second shaft segment 2 and penetrates into the third shaft segment 3. A second sealing groove 109 is provided on the end surface of the first shaft segment 1 and at the water channel opening, and a second sealing component is embedded in the second sealing groove 109.

[0040] In this embodiment, the water channel 107 is used to pass cooling liquid to cool the mold core, and the second sealing groove 109 is annular. The second sealing groove 109 encloses the water channel opening to ensure that the cooling liquid does not leak.

[0041] In this embodiment, the first sealing member and the second sealing member are both high temperature resistant sealing rings.

[0042] Specifically, the water channel 107 in the first shaft segment 1 is provided with a waterproof plate 108, which is arranged along the axis of the first shaft segment 1 and the two sides of the waterproof plate 108 are connected to the inner wall of the first shaft segment 1 to divide the water channel 107 in the first shaft segment 1 into two.

[0043] In this embodiment, if Figure 1 As shown, the water-blocking plate 108 is only arranged in the first shaft section 1. The water-blocking plate 108 divides the water path 107 into an inlet end and an outlet end. The cooling liquid enters from the inlet end, flows to the second shaft section 2 and the third shaft section 3, and then flows out through the outlet end, forming a cooling circuit.

[0044] Embodiment 2:

[0045] This embodiment is similar to Embodiment 1, except that, in this embodiment, a sensor 4 for detecting the installation position of the stainless steel insert is provided on the end surface of the body abutting against the stainless steel insert.

[0046] In this embodiment, the sensor 4 is an optical sensor, and the working principle of the optical sensor is mainly based on the characteristics of light propagation, reflection, scattering and absorption. It illuminates the object to be detected through a light source (such as a light emitting diode (LED) or a laser), and uses the reflection, transmission or absorption of light on the object to obtain the physical quantity information of the object. This information is then converted into an electrical signal to achieve the detection and measurement of the object. Optical sensors can be divided into several types, including contact type, non-contact type, spectral type, etc., each of which has different application fields. When the stainless steel insert abuts the step surface 104, it blocks the light source of the sensor 4, and the sensor 4 sends a signal to inform the technician that the stainless steel insert has been installed in place.

[0047] Specifically, the step surface 104 is recessed inwardly to form a mounting position for the sensor 4 to be embedded in, and the sensor 4 is embedded in the mounting position and the end surface of the sensor 4 is flush with the step surface 104 .

[0048] In this embodiment, two sensors 4 are provided, and the two sensors 4 are symmetrically arranged with respect to the axis section of the first axis section 1 to ensure that the stainless steel insert completely fits the step surface 104 .

[0049] Embodiment 3:

[0050] This embodiment is similar to the embodiment 1, except that, in this embodiment, an annular groove 105 is provided on the step surface 104 , and the second air outlet 103 is in communication with the annular groove 105 .

[0051] In this embodiment, the annular groove 105 can balance the force on the stainless steel insert when it is adsorbed.

[0052] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0053] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. An injection mold core, characterized in that: The invention comprises a main body, wherein an air passage (101) passes through the main body, wherein the air passage (101) passes through two ends of the main body to form a first air outlet (102) and a second air outlet (103), respectively, wherein the first air outlet (102) is used to connect to an air pump, and a stainless steel insert abuts against an end surface of the main body and covers the second air outlet (103). A sensor (4) for detecting the installation position of the stainless steel insert is provided on the end surface of the main body abutting against the stainless steel insert.

2. An injection mold core according to claim 1, characterized in that: The body comprises a first shaft section (1) and a second shaft section (2) which are coaxially connected, a step surface (104) is formed at the connection between the first shaft section (1) and the second shaft section (2), the step surface (104) is adapted to the end surface of the stainless steel insert, the stainless steel insert is sleeved on the second shaft section (2) and one end thereof abuts against the step surface (104), and the second air outlet (103) is arranged on the step surface (104).

3. An injection mold core according to claim 2, characterized in that: An annular groove (105) is provided on the step surface (104), and the second air outlet (103) is in communication with the annular groove (105).

4. The injection mold core according to claim 2, characterized in that: Two air passages (101) are provided, and the two air passages (101) are symmetrically arranged with respect to the axis of the first shaft section (1).

5. The injection mold core according to claim 1, characterized in that: The end surface of the body is provided with a first sealing groove (106) at the outer peripheral position of the first air outlet (102), and a first sealing member is embedded in the first sealing groove (106).

6. The injection mold core according to claim 2, characterized in that: The step surface (104) is recessed inwardly to form a mounting position for the sensor (4) to be embedded; the sensor (4) is embedded in the mounting position and the end surface of the sensor (4) is flush with the step surface (104).

7. The injection mold core according to claim 2, characterized in that: A water channel (107) runs through the first shaft section (1), and the water channel (107) is arranged along the axis of the first shaft section (1). One end of the water channel (107) forms a water channel opening at the position where it penetrates into the first shaft section (1), and the other end of the water channel (107) passes through the other end surface of the first shaft section (1) and penetrates into the second shaft section (2). A second sealing groove (109) is provided on the end surface of the first shaft section (1) and at the position of the water channel opening, and a second sealing component is embedded in the second sealing groove (109).

8. The injection mold core according to claim 7, characterized in that: The water channel (107) in the first shaft section (1) is provided with a water blocking sheet (108), which is arranged along the axis of the first shaft section (1) and the two sides of the water blocking sheet (108) are connected to the inner wall of the first shaft section (1) to divide the water channel (107) in the first shaft section (1) into two.

9. The injection mold core according to claim 7, characterized in that: A third shaft segment (3) is coaxially connected to the end surface of the second shaft segment (2) away from the first shaft segment (1), and the structure of the third shaft segment (3) is adapted to the inner core structure of the injection molded part.

10. The injection mold core according to claim 9, characterized in that: The water channel (107) passes through the second shaft section (2) and penetrates into one end of the third shaft section (3).

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