Core pulling device and mold

Abstract

The utility model discloses a core-pulling device and mould, the core-pulling device comprises an upper mould, a lower mould matched with the upper mould and a core-pulling component, a cavity is formed between the upper mould and the lower mould, the core-pulling component is arranged on the lower mould, the core-pulling component is arranged corresponding to the cavity, and the core-pulling component is arranged on the lower mould. The bottom of the core pulling assembly is connected with the lower die in a sliding mode, the top of the core pulling assembly is matched with the bottom of the upper die, the core pulling assembly is provided with an air blowing assembly, the air blowing assembly is communicated with the cavity, and the core pulling device is installed in the die. According to the utility model, the core-pulling action is realized through the sliding of the core-pulling assembly, and meanwhile, the blowing assembly blows air to assist in demolding, so that an injection product can be smoothly demolded, and the production efficiency and the production quality are improved.

Description

Technical Field

[0001] The utility model relates to the field of core pulling moulds, and more specifically, to a core pulling device and a mould. Background Art

[0002] PVC silencer pipe elbows can slow down the speed and pressure of water flow, reduce water flow impact and noise, protect the pipeline system and equipment, and improve the stability of the pipeline system. Most of these elbows are made of soft PVC material, with high requirements for appearance and performance. The surface of the pipe fittings must be smooth and flat, and no defects such as cracks, bubbles, peeling, uneven color or decomposition and discoloration are allowed.

[0003] Injection-molded PVC soft rubber products have great clamping and adhesion forces on the mold core. When the core of soft rubber pipe fittings is pulled out and demolded, a vacuum effect will be formed in the product cavity, causing the core to lock, and the product will also deform and stretch slightly, thus affecting production continuity, causing product breakage, and affecting product appearance. Utility Model Content

[0004] In order to solve the above problems, the utility model proposes a core pulling device, which can slide on the lower mold to realize the core pulling action when the mold is opened. At the same time, the blowing component blows the injection molded product to demold it, effectively preventing the injection molded product from adhering to the core pulling component due to the vacuum effect, ensuring that the injection molded product can be demolded smoothly, thereby improving production efficiency and production quality.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a core pulling device, which includes an upper mold, a lower mold cooperating with the upper mold, and a core pulling assembly. A cavity is formed between the upper mold and the lower mold. The core pulling assembly is arranged corresponding to the cavity. The bottom of the core pulling assembly is slidably connected to the lower mold, and the top of the core pulling assembly is adapted to the bottom of the upper mold. A blowing assembly is provided on the core pulling assembly, and the blowing assembly is communicated with the cavity.

[0006] The injection molded product in this technical solution is a soft rubber tube. The upper mold and the lower mold are covered to form a cavity that matches the outer wall of the injection molded product. The injection molded product is then cored out by a core-pulling assembly that matches the inner wall of the injection molded product. When the injection molded product is demolded, the upper mold is first separated from the lower mold, and the core-pulling assembly slides to pull the core. During the core-pulling process, the blowing assembly works synchronously to blow the injection molded product attached to the core-pulling assembly to demold the injection molded product, so that the core-pulling assembly can pull the core smoothly, which not only ensures the quality of the injection molded product, but also improves production efficiency.

[0007] As a preferred embodiment, the injection molded product is specifically an inclined three-way soft rubber pipe fitting. In order to form a cavity that matches the outer wall of the injection molded product, a first cavity and a second cavity obliquely connected to the first cavity are provided between the inner wall of the upper mold and the inner wall of the lower mold. The first cavity and the second cavity form the cavity.

[0008] As a preferred solution, since the injection molded product has a three-way hollow structure, core pulling is required to form a hollow pipe structure, so the core pulling assembly includes a first core pulling mechanism, a second core pulling mechanism and a third core pulling mechanism. The first core pulling mechanism and the second core pulling mechanism are respectively slidably connected to the two ends of the lower mold and are corresponding to the two ends of the first cavity. The third core pulling mechanism is slidably connected to one end of the lower mold and is corresponding to the end of the second cavity. During the mold opening process, the first core pulling mechanism, the second core pulling mechanism and the third core pulling mechanism perform core pulling actions synchronously to balance the force of the injection molded product, thereby ensuring production quality.

[0009] As a preferred solution, in order to pull the core of the injection molded product, the first core pulling mechanism, the second core pulling mechanism and the third core pulling mechanism all include: a telescopic structure, a limit plate, an inner slider, an outer slider, an outer mold core and an inner mold core, the outer slider is slidably connected to the lower mold, the inner slider is slidably connected to the outer slider, the limit plate is fixed to one side of the outer slider to limit the sliding of the inner slider, the limit plate is provided with a groove for the telescopic end of the telescopic structure to pass through, the body of the telescopic structure is fixed to one end of the lower mold, the telescopic end of the telescopic structure passes through the groove and is fixed to one end of the inner slider, the outer mold core is fixed to one side of the outer slider, the inner mold core is fixed to the other end of the inner slider, one side of the outer slider is respectively provided with an opening for the inner mold core to pass through, the inner mold core passes through the opening of the outer slider and is sleeved with the outer mold core.

[0010] As a preferred solution, in order to make the outer slider slide on the lower mold and the inner slider slide on the outer slider, the lower mold is provided with three first sliding grooves corresponding to the outer sliders of the first core pulling mechanism, the second core pulling mechanism and the third core pulling mechanism, the outer sliders of the first core pulling mechanism, the second core pulling mechanism and the third core pulling mechanism are respectively slidably connected to the lower mold through the corresponding three first sliding grooves, one side of the three first sliding grooves is respectively provided with a fixed plate, the three telescopic structures are respectively fixed on the corresponding fixed plates, the three outer sliders are respectively provided with second sliding grooves, and the three inner sliders are respectively slidably connected to the outer sliders through the corresponding second sliding grooves.

[0011] As a preferred solution, the two inner mold cores are coaxially arranged, and an angle A is formed between the other inner mold core and the two coaxially arranged inner mold cores, and the angle A is 45 degrees. The end faces of the two inner mold cores are abutted against each other, and the other inner mold core is abutted against one side outer wall of the two inner mold cores to form a structure that is compatible with the inner wall of the injection molded product.

[0012] As a preferred solution, in order to perform air blowing and demolding synchronously during the mold opening process, the blowing assembly includes a touch control part, an air pipe and an air valve, the touch control part is fixed on an inner slider of one group of core pulling mechanisms, the air valve corresponds to the inner slider of the group of core pulling mechanisms and is fixed on the lower mold, the touch control part slides with the inner slider to contact or move away from the air valve and close or open the air valve, one end of the air pipe is connected to the cavity, and the other end of the air pipe is connected to the air valve, during the mold opening process, when the telescopic structure drives the inner slider of the core pulling mechanism to slide outward, the touch control part on the inner slider moves away from the travel switch of the air valve, so that the air valve is opened for air blowing and demolding.

[0013] As a preferred solution, in order to allow the gas of the blowing assembly to pass into the mold cavity, an air channel is provided in the inner slider where the touch control part is located, one end of the air channel passes through the outer wall of the inner slider and is connected to one end of the air pipe, and the other end of the air channel extends to the outer wall of the inner mold core corresponding to the inner slider and is connected to the mold cavity.

[0014] As a preferred solution, in order to ensure that the core pulling can proceed smoothly, an inclined pressure block is vertically fixed to one end of the inner slider, and a notch is provided at the bottom of the outer slider that matches the inclined pressure block. The inclined pressure block protrudes from the bottom end of the inner slider and is flush with the bottom end of the outer slider. A mounting position is provided on the first slide groove where the outer slider is located, and the mounting position is vertically arranged and corresponds to the inclined pressure block. A spring and a floating stopper are provided in the mounting position, and the floating stopper slides in the mounting position, and one end of the spring is connected to the bottom of the mounting position, and the other end of the spring is connected to the bottom of the floating stopper so that the floating stopper protrudes from the mounting position, and the width of the floating stopper is greater than the width of the notch at the bottom of the outer slider.

[0015] When the inner slider slides to the limit plate and abuts against the limit plate, it drives the outer slider to slide outward together, thereby realizing the graded sliding of the inner and outer sliders, and then realizing the graded core pulling action of the outer mold core and the inner mold core. In this graded core pulling process, the three inner mold cores are pulled outwards driven by the corresponding inner sliders, while the outer mold core is blocked by the floating block and remains motionless with the outer slider so as to apply a force opposite to the core pulling direction of the inner mold core to the end face of the injection molded product, thereby facilitating the demoulding of the injection molded product and avoiding the elongation and deformation of the injection molded product.

[0016] In order to achieve the above-mentioned purpose, the utility model provides a mold, which includes the above-mentioned core pulling device, and also includes an upper mold assembly, a lower mold assembly and a guide assembly. The upper mold assembly is fixed on the top of the core pulling device, and the lower mold assembly is fixed to the bottom of the core pulling device. One end of the guide assembly is fixed on the lower mold assembly, and the other end of the guide assembly passes through the core pulling assembly and the upper mold assembly in sequence.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. The injection molded product attached to the core pulling component is blown by the blowing component arranged on the core pulling component to demould the injection molded product, so that the core pulling component can be smoothly pulled out, which not only ensures the quality of the injection molded product, but also improves the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the core pulling device of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the core pulling assembly;

[0021] Figure 3 It is an exploded schematic diagram of the core pulling mechanism;

[0022] Figure 4 It is a schematic diagram of the core pulling device of the utility model in the mold closing state;

[0023] Figure 5 It is a schematic diagram of the core pulling device of the utility model in the mold opening state;

[0024] Figure 6 It is the installation diagram of the blowing assembly;

[0025] Figure 7 It is a structural diagram of soft rubber pipe fittings;

[0026] In the figure: upper mold 1; lower mold 2; fixed plate 201; mounting position 202; blowing assembly 3; touch control part 301; air pipe 302; air valve 303; first core pulling mechanism 4; second core pulling mechanism 5; third core pulling mechanism 6; telescopic structure 7; limit plate 8; inner slide block 9; outer slide block 10; notch 1001; outer mold core 11; first inner mold core 12; second inner mold core 13; third inner mold core 14; air channel 15; oblique pressure block 16; spring 17; floating block 18; soft rubber pipe fitting 19. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0030] Embodiment 1:

[0031] like Figures 1 to 3 As shown, a core pulling device is provided, including an upper mold 1, a lower mold 2 cooperating with the upper mold 1, and a core pulling assembly, the inner walls of the upper mold 1 and the lower mold 2 form a cavity, the core pulling assembly is arranged corresponding to the cavity, the bottom of the core pulling assembly is slidably connected to the lower mold 2, the top of the core pulling assembly is adapted to the bottom of the upper mold 1, and a blowing assembly 3 is provided on the core pulling assembly, and the blowing assembly 3 is communicated with the cavity.

[0032] In this embodiment, if Figure 7As shown, the soft rubber pipe fitting 19 is an oblique three-way soft rubber pipe fitting, which has three hollow shaft segments, and the cavity formed by the upper mold 1 and the lower mold 2 is provided with three cavity positions corresponding to the shaft segments of the soft rubber pipe fitting 19, and three sliding structures are provided on the lower mold 2 for the sliding of the core pulling assembly, and the upper mold 1 and the lower mold 2 are provided with runners corresponding to the cavity, and the upper mold 1 is provided with a pouring port corresponding to the runner, and the upper mold 1 and the lower mold 2 are provided with cooling water channels for cooling after the injection molding is completed. In the mold closing stage, the upper mold 1 and the lower mold 2 are covered, and the core pulling assembly slides to the mold closing position, and then pouring is performed from the pouring port; in the mold opening stage, the upper mold 1 is separated first, and then the core pulling assembly slides and pulls the core along three directions on the lower mold 2. While the core pulling is in progress, the blowing assembly 3 blows air between the core pulling assembly and the formed soft rubber pipe fitting 19 to eliminate the vacuum effect, and the soft rubber pipe fitting 19 can be taken out after the core pulling work is completed.

[0033] Specifically, a first cavity and a second cavity obliquely connected to the first cavity are provided between the inner wall of the upper mold 1 and the inner wall of the lower mold 2, and the first cavity and the second cavity form the mold cavity, and the first cavity and the second cavity are both cylindrical structures of equal diameter.

[0034] In this embodiment, the cavity composed of the first cavity and the second cavity is adapted to the outer peripheral contour of the soft rubber tube 19, and in the mold closing state, the cavity is closed by the core pulling assembly, the upper mold 1 and the lower mold 2.

[0035] Specifically, Figure 2 As shown, the core pulling assembly includes a first core pulling mechanism 4, a second core pulling mechanism 5 and a third core pulling mechanism 6. The first core pulling mechanism 4 and the second core pulling mechanism 5 are respectively slidably connected to the two ends of the lower mold 2 and are correspondingly arranged at the two ends of the first cavity. The third core pulling mechanism 6 is slidably connected to one end of the lower mold 2 and is correspondingly arranged at the end of the second cavity.

[0036] In this embodiment, the first core-pulling mechanism 4 and the second core-pulling mechanism 5 perform core pulling on the axial segment of the soft rubber tube 19 in the straight direction, and the third core-pulling mechanism 6 performs core pulling on the axial segment of the soft rubber tube 19 in the inclined direction.

[0037] Specifically, Figure 2 , 3As shown, the first core-pulling mechanism 4, the second core-pulling mechanism 5 and the third core-pulling mechanism 6 all include: a telescopic structure 7, a limiting plate 8, an inner slider 9, an outer slider 10, and an outer mold core 11, wherein the outer slider 10 is slidably connected to the lower mold 2, the inner slider 9 is slidably connected to the outer slider 10, the limiting plate 8 is fixed to one side of the outer slider 10 to limit the sliding of the inner slider 9, the limiting plate 8 is provided with a groove for the telescopic end of the telescopic structure 7 to pass through, the body of the telescopic structure 7 is fixed to one end of the lower mold 2, and the telescopic end of the telescopic structure 7 passes through the The groove is fixed to one end of the inner slider 9, the outer mold core 11 is fixed to one side of the outer slider 10, and the first inner mold core 12, the second inner mold core 13 and the third inner mold core 14 are respectively fixed on the inner sliders 9 corresponding to the first core pulling mechanism 4, the second core pulling mechanism 5 and the third core pulling mechanism 6, and one side of the three outer sliders 10 is respectively provided with openings for the first inner mold core 12, the second inner mold core 13 and the third inner mold core 14 to pass through, and the first inner mold core 12, the second inner mold core 13 and the third inner mold core 14 respectively pass through the corresponding openings and are sleeved with the corresponding outer mold core 11.

[0038] In this embodiment, the telescopic structure 7 is an oil cylinder, and the three telescopic structures 7 respectively drive the three inner slide blocks 9 to slide simultaneously, so that the first inner mold core 12, the second inner mold core 13 and the third inner mold core 14 respectively slide axially with the corresponding inner slide blocks 9, thereby realizing the core pulling of the soft rubber tube fitting 19 in three directions. The three outer mold cores 11 correspond to the three axial ends of the soft rubber tube fitting 19, and the strokes of the three telescopic structures 7 meet the core pulling requirements of the soft rubber tube fitting 19 in three directions.

[0039] Specifically, the lower mold 2 is provided with three first sliding grooves corresponding to the outer sliding blocks 10 of the first core pulling mechanism 4, the second core pulling mechanism 5 and the third core pulling mechanism 6, and the outer sliding blocks 10 of the first core pulling mechanism 4, the second core pulling mechanism 5 and the third core pulling mechanism 6 are respectively slidably connected to the lower mold 2 through the corresponding three first sliding grooves, and a fixed plate 201 is respectively provided on one side of the three first sliding grooves, and the three telescopic structures 7 are respectively fixed on the corresponding fixed plates 201, and second sliding grooves are respectively provided in the three outer sliding blocks 10, and the three inner sliding blocks 9 are respectively slidably connected to the outer sliding blocks 10 through the corresponding second sliding grooves.

[0040] In this embodiment, the first sliding groove and the second sliding groove respectively guide the sliding of the outer slider 10 and the inner slider 9 to prevent the outer slider 10 and the inner slider 9 from offsetting, and the fixing plate 201 is used to limit the stroke of the outer slider 10.

[0041] Specifically, Figure 6As shown, the first inner mold core 12 and the second inner mold core 13 are coaxially arranged and one end of the first inner mold core 12 is structurally adapted to one end of the second inner mold core 13; the third inner mold core 14 forms an angle A of 45 degrees with the first inner mold core 12 and the second inner mold core 13; one end of the third inner mold core 14 is structurally adapted to the outer wall structure of the first inner mold core 12.

[0042] In this embodiment, when the mold is closed, one end of the first inner mold core 12 abuts against one end of the second inner mold core 13, and one end of the third inner mold core 14 abuts against the outer wall of the first inner mold core 12. When the mold is opened, the first inner mold core 12, the second inner mold core 13 and the third inner mold core 14 are simultaneously pulled outward.

[0043] Specifically, Figure 6 As shown, the blowing assembly 3 includes a touch control part 301, an air pipe 302 and an air valve 303, the touch control part 301 is fixed on the inner slider 9 of the third core-pulling mechanism 6, the air valve 303 corresponds to the inner slider 9 of the third core-pulling mechanism 6 and is fixed on the lower mold 2, the touch control part 301 slides with the inner slider 9 to contact or move away from the air valve 303 and close or open the air valve 303, one end of the air pipe 302 is connected to the cavity, and the other end of the air pipe 302 is connected to the air valve 303.

[0044] In this embodiment, the air valve 303 is connected to the air compressor. When the mold is closed, the touch control part 301 contacts the travel switch of the air valve 303 to close the air valve 303. When the mold is opened, the touch control part 301 is separated from the travel switch of the air valve 303 to open the air valve 303, and the gas is passed to the cavity along the air pipe 302, so that the soft rubber tube 19 can be separated from the three inner mold cores, thereby allowing the core pulling action to proceed smoothly.

[0045] Specifically, Figure 6 As shown, an air duct 15 is provided in the inner slider 9 of the third core pulling mechanism 6, one end of the air duct 15 passes through the outer wall of the inner slider 9 of the third core pulling mechanism 6 and is connected with one end of the air pipe 302, and the other end of the air duct 15 extends toward the outer wall of the third inner mold core 14 and is connected with the mold cavity.

[0046] In this embodiment, the gas is introduced into the mold cavity through the air channel 15 . The air channel 15 and the blowing assembly 3 may also be arranged on the first core-pulling mechanism 4 or the second core-pulling mechanism 5 .

[0047] Embodiment 2:

[0048] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 4 , 5As shown, an inclined pressure block 16 is vertically fixed to one end of the inner slider 9, and a notch 1001 adapted to the inclined pressure block 16 is provided at the bottom of the outer slider 10. The inclined pressure block 16 protrudes from the bottom end of the inner slider 9 and is flush with the bottom end of the outer slider 10. A mounting position 202 is provided on the first slide groove where the outer slider 10 is located. The mounting position 202 is vertically arranged and corresponds to the inclined pressure block 16. A spring 17 and a floating block 18 are provided in the mounting position 202. The floating block 18 slides in the mounting position 202. One end of the spring 17 is connected to the bottom of the mounting position 202, and the other end of the spring 17 is connected to the bottom of the floating block 18 so that the floating block 18 protrudes from the mounting position 202. The width of the floating block 18 is greater than the width of the notch 1001 at the bottom of the outer slider 10.

[0049] In this embodiment, the spring 17 is in a compressed state, and the floating block 18 protrudes upward from the first slide groove under the tension of the spring 17 and abuts against the end face of one side of the outer slide 10 to prevent the outer slide 10 from sliding. When the mold is opened, the inner slide 9 is driven by the telescopic structure 7 to pull the core along the second slide groove, while the outer slide 10 cannot slide due to the obstruction of the floating block 18. The inner slide 9 drives the oblique pressure block 16 to slide in the notch 1001 and presses the floating block 18 downward to be flush with the bottom surface of the outer slide 10. At the same time, one side of the inner slide 9 abuts against the limit plate 8, and the inner slide 9 drives the outer slide 10 to slide outward with the limit plate 8, thereby realizing graded core pulling by three groups of core pulling mechanisms.

[0050] Embodiment 3:

[0051] A mold, the above-mentioned core pulling device also includes an upper mold assembly, a lower mold assembly and a guide assembly, the upper mold assembly is fixed on the top of the core pulling device, the lower mold assembly is fixed to the bottom of the core pulling device, one end of the guide assembly is fixed on the lower mold assembly, and the other end of the guide assembly passes through the core pulling assembly and the upper mold assembly in sequence.

[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. A core pulling device, characterized in that: The invention comprises an upper mold (1), a lower mold (2) matched with the upper mold (1), and a core pulling assembly, wherein a cavity is formed between the upper mold (1) and the lower mold (2), the core pulling assembly is arranged corresponding to the cavity, the bottom of the core pulling assembly is slidably connected to the lower mold (2), the top of the core pulling assembly is adapted to the bottom of the upper mold (1), and a blowing assembly (3) is provided on the core pulling assembly, and the blowing assembly (3) is communicated with the cavity.

2. A core pulling device according to claim 1, characterized in that: A first cavity and a second cavity obliquely connected to the first cavity are provided between the inner wall of the upper mold (1) and the inner wall of the lower mold (2); the first cavity and the second cavity form the mold cavity.

3. A core pulling device according to claim 2, characterized in that: The core pulling assembly comprises a first core pulling mechanism (4), a second core pulling mechanism (5) and a third core pulling mechanism (6); the first core pulling mechanism (4) and the second core pulling mechanism (5) are respectively slidably connected to the two ends of the lower mold (2) and are arranged corresponding to the two ends of the first cavity; the third core pulling mechanism (6) is slidably connected to one end of the lower mold (2) and is arranged corresponding to the end of the second cavity.

4. A core pulling device according to claim 3, characterized in that: The first core-pulling mechanism (4), the second core-pulling mechanism (5) and the third core-pulling mechanism (6) all comprise: a telescopic structure (7), a limiting plate (8), an inner slider (9), an outer slider (10), an outer mold core (11) and an inner mold core, wherein the outer slider (10) is slidably connected to the lower mold (2), the inner slider (9) is slidably connected to the outer slider (10), the limiting plate (8) is fixed to one side of the outer slider (10) to limit the sliding of the inner slider (9), and the limiting plate (8) is provided with a spacer for the telescopic structure (7). The telescopic end of the telescopic structure (7) passes through a groove, the main body of the telescopic structure (7) is fixed to one end of the lower mold (2), the telescopic end of the telescopic structure (7) passes through the groove and is fixed to one end of the inner slider (9), the outer mold core (11) is fixed to one side of the outer slider (10), the inner mold core is fixed to the other end of the inner slider (9), one side of the outer slider (10) is respectively provided with an opening for the inner mold core to pass through, the inner mold core passes through the opening of the outer slider (10) and is sleeved with the outer mold core (11).

5. A core pulling device according to claim 4, characterized in that: The lower mold (2) is provided with three first sliding grooves corresponding to the outer sliding blocks (10) of the first core pulling mechanism (4), the second core pulling mechanism (5) and the third core pulling mechanism (6); the outer sliding blocks (10) of the first core pulling mechanism (4), the second core pulling mechanism (5) and the third core pulling mechanism (6) are respectively slidably connected to the lower mold (2) through the corresponding three first sliding grooves; a fixed plate (201) is respectively provided on one side of the three first sliding grooves; the three telescopic structures (7) are respectively fixed on the corresponding fixed plates (201); the three outer sliding blocks (10) are respectively provided with second sliding grooves; the three inner sliding blocks (9) are respectively slidably connected to the outer sliding blocks (10) through the corresponding second sliding grooves.

6. A core pulling device according to claim 4, characterized in that: Two of the inner mold cores are coaxially arranged, and an angle A is formed between another inner mold core and the two coaxially arranged inner mold cores, and the angle A is 45 degrees.

7. A core pulling device according to claim 4, characterized in that: The blowing assembly (3) comprises a touch panel (301), an air pipe (302) and an air valve (303); the touch panel (301) is fixed on an inner slider (9) of one set of core-pulling mechanisms; the air valve (303) corresponds to the inner slider (9) of the set of core-pulling mechanisms and is fixed on the lower mold (2); the touch panel (301) slides with the inner slider (9) to contact or move away from the air valve (303) and close or open the air valve (303); one end of the air pipe (302) is connected to the mold cavity, and the other end of the air pipe (302) is connected to the air valve (303).

8. A core pulling device according to claim 7, characterized in that: An air channel (15) is provided in the inner slider (9) where the touch control part (301) is located, one end of the air channel (15) passes through the outer wall of the inner slider (9) and is connected to one end of the air pipe (302), and the other end of the air channel (15) extends to the outer wall of the inner mold core corresponding to the inner slider (9) and is connected to the mold cavity.

9. A core pulling device according to claim 5, characterized in that: A diagonal pressure block (16) is vertically fixed to one end of the inner slider (9), a notch (1001) adapted to the diagonal pressure block (16) is provided at the bottom of the outer slider (10), the diagonal pressure block (16) protrudes from the bottom end of the inner slider (9) and is flush with the bottom end of the outer slider (10), a mounting position (202) is provided on the first slide groove where the outer slider (10) is located, the mounting position (202) is vertically arranged and corresponds to the diagonal pressure block (16), the mounting position ( A spring (17) and a floating stopper (18) are provided in the mounting position (202), the floating stopper (18) slides in the mounting position (202), one end of the spring (17) is connected to the bottom of the mounting position (202), and the other end of the spring (17) is connected to the bottom of the floating stopper (18) so that the floating stopper (18) protrudes from the mounting position (202), and the width of the floating stopper (18) is greater than the width of the notch (1001) at the bottom of the outer sliding block (10).

10. A mold, characterized in that: The core pulling device comprises the core pulling device according to any one of claims 1 to 9, and further comprises an upper mold assembly, a lower mold assembly and a guide assembly, wherein the upper mold assembly is fixed to the top of the core pulling device, the lower mold assembly is fixed to the bottom of the core pulling device, one end of the guide assembly is fixed to the lower mold assembly, and the other end of the guide assembly passes through the core pulling assembly and the upper mold assembly in sequence.

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