Mold for forming a cylindrical member, core-pulling method, and mold assembly for forming a cylindrical housing

Abstract

The application discloses a mold for forming a cylindrical part, a core-pulling method and a mold assembly for manufacturing a cylindrical shell, the mold for forming a cylindrical part comprises a first mold plate, a first demolding sliding block, a second mold plate for forming a first inner cavity by closing the mold with the first mold plate, a first mold core arranged in the first inner cavity and surrounded by the inner wall of the first inner cavity to form a cavity for forming the cylindrical part, and a first demolding pull rod in sliding connection with the first demolding sliding block, the first demolding sliding block is fixedly connected with the second mold plate, the first demolding sliding block is provided with a first guide inclined surface, the first demolding pull rod is provided with a first matching inclined surface matched with the first guide inclined surface, one end of the first demolding pull rod away from the first demolding sliding block is fixedly connected with the first mold core, and the first guide inclined surface is matched with the first matching inclined surface to make the first demolding sliding block drive the first demolding pull rod to move in the direction perpendicular to the mold opening and drive the first mold core to separate from the cylindrical part in the direction perpendicular to the mold opening when the mold is opened.

Description

Technical Field

[0001] This invention relates to the field of molds, and more particularly to molds for molding cylindrical parts, core-pulling methods, and mold assemblies for molding cylindrical shells. Background Technology

[0002] Existing stethoscope housings consist of a cylindrical shell molded from hard plastic and a portion molded from soft plastic outside the cylindrical shell. During mold processing, a columnar core is required to form or fix the cylindrical shell. After injection molding, the core is embedded inside the cylindrical component and needs to be removed. Current technology generally involves opening the mold first and then removing the core, which cannot achieve automatic core removal. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a mold for molding cylindrical parts that can automatically pull out the core as the mold opens.

[0004] One of the objectives of this invention is achieved through the following technical solution:

[0005] A mold for molding a cylindrical component is provided, comprising a first template, a first demolding slider, a second template for closing with the first template to form a first inner cavity, a first mold core disposed within the first inner cavity and surrounding the inner wall of the first inner cavity to form a cavity for molding the cylindrical component, and a first demolding pull rod slidably connected to the first demolding slider. The first demolding slider is fixedly connected to the second template, and the first demolding slider is provided with a first guide slope. The first demolding pull rod is provided with a first mating slope that cooperates with the first guide slope. One end of the first demolding pull rod away from the first demolding slider is fixedly connected to the first mold core. The first guide slope and the first mating slope cooperate so that when the mold is opened, the first demolding slider moves with the second template, causing the first demolding pull rod to move in a direction perpendicular to the mold opening and causing the first mold core to detach from the cylindrical component in a direction perpendicular to the mold opening.

[0006] Further, the first mold core includes a connecting block and a core body connected to the connecting block and used for molding a cylindrical component. The connecting block is fixedly connected to the first demolding tie rod. The core body is connected to the side of the connecting block away from the first demolding tie rod, and the axial direction of the core body is perpendicular to the mold opening direction. The first guide slope extends from the second template to the first template away from the first mold core; and / or,

[0007] Two rollers are connected to one end of the first demolding pull rod near the first demolding slider. The two rollers are respectively located on both sides of the first mating inclined surface. The first demolding slider is provided with strip grooves for the two rollers to slide on, and the inclination direction of the strip grooves is the same as the inclination direction of the first guide inclined surface; and / or,

[0008] Furthermore, the mold for forming cylindrical components also includes a first clearance slider fixedly connected to the first template. The first clearance slider is provided with a first clearance slope whose inclination direction is opposite to that of the first guide slope. The first mold core is provided with a second clearance slope that cooperates with the first clearance slope.

[0009] Furthermore, the mold for forming the cylindrical component further includes a demolding ejector pin and a second demolding slider disposed on the side of the first mold core away from the first demolding slider and used to form a groove on the cylindrical component. One end of the demolding ejector pin is fixedly connected to the first mold template and the demolding ejector pin is inclined relative to the first mold template. The second demolding slider is provided with a demolding groove that cooperates with the demolding ejector pin. The demolding ejector pin cooperates with the second demolding slider to drive the second demolding slider away from the cylindrical component in the perpendicular mold opening direction when the demolding ejector pin moves along the first mold template in the mold opening direction.

[0010] Furthermore, the mold for forming the cylindrical component also includes a second clearance slider that is fixedly connected to the first template and is located on the side of the second demolding slider away from the first mold core. The second clearance slider has a third clearance slope with the same inclination direction as the demolding ejector pin, and a fourth clearance slope that cooperates with the third clearance slope.

[0011] Furthermore, the mold for forming the cylindrical component further includes a first guide slider fixedly connected to the first template and a connector embedded in the first mold core. The first guide slider is slidably connected to the connector, and a forming slider for forming mounting holes on the cylindrical component is slidably connected to the connector. The first mold core has a through hole for the forming slider to pass through. The first guide slider has a second guide slope. The connector has a second mating slope that cooperates with the second guide slope. The second guide slope and the second mating slope cooperate to drive the connector to move in a direction perpendicular to the mold opening direction when the first guide slider moves along the first template in the mold opening direction. The connector also has a third guide slope with an inclination direction opposite to that of the second guide slope. The forming slider has a third mating slope that cooperates with the third guide slope. The third guide slope and the third mating slope cooperate to drive the forming slider to move from protruding outside the first mold core to retracting inside the first mold core when the connector moves in a direction perpendicular to the mold opening direction.

[0012] Furthermore, the first guide slider includes a connecting portion fixedly connected to the first template and a guide portion connected to the connecting portion on the side away from the first template. The first guide slope is disposed on the guide portion and extends obliquely from the connecting portion toward the second template in a manner that gradually moves away from the forming slider.

[0013] Furthermore, the guide portion extends obliquely from the connecting portion toward the second template in a manner that gradually moves away from the forming slider, and a guide groove that mates with the guide portion is formed on the connecting member.

[0014] A core-pulling method is also provided for core pulling on a mold for forming a cylindrical part as described above, characterized by comprising the steps of:

[0015] Upon mold opening, the first template and the second template separate, and the first demolding slider moves with the second template.

[0016] With the cooperation of the first guide ramp and the second guide ramp, the first demolding tie rod moves in the direction perpendicular to demolding;

[0017] The first mold core moves along the direction perpendicular to demolding with the first demolding pull rod.

[0018] A mold assembly for manufacturing a cylindrical shell is also provided, comprising a first mold for injection molding a cylindrical rigid plastic shell using a first adhesive material and a second mold for injection molding a soft plastic material onto the cylindrical rigid plastic shell using a second adhesive material. The second mold includes a third template, a third demolding slider, a fourth template for closing with the third template to form a second inner cavity, a second mold core disposed within the second inner cavity for fixing the cylindrical rigid plastic shell, and a second demolding pull rod slidably connected to the third demolding slider. The third demolding slider is fixedly connected to the fourth template, and the third demolding slider has a fourth guide slope. The second demolding pull rod has a fourth mating slope that cooperates with the fourth guide slope. One end of the second demolding pull rod away from the third demolding slider is fixedly connected to the second mold core. The fourth guide slope cooperates with the fourth mating slope so that when the mold is opened, the third demolding slider moves with the fourth template, causing the second demolding pull rod to move in a direction perpendicular to the mold opening and causing the second mold core to detach from the cylindrical shell in a direction perpendicular to the mold opening.

[0019] Preferably, the cylindrical outer shell is the outer shell of a stethoscope.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the first demolding slider is fixedly connected to the second template, the first demolding slider is provided with a first guide slope, and the end of the first demolding pull rod that is slidably connected to the first demolding slider is provided with a first mating slope that cooperates with the first guide slope. Through the cooperation of the first guide slope and the first mating slope, when the mold is opened, the first demolding slider moves with the second template and drives the first demolding pull rod to move in the direction perpendicular to the mold opening, thereby causing the first demolding pull rod to drive the first mold core to detach from the cylindrical component in the direction perpendicular to the mold opening, thereby realizing automatic core pulling. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of a mold assembly for molding a cylindrical shell provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the first mold in the mold assembly used for molding the cylindrical shell along line AA;

[0023] Figure 3 This is a schematic cross-sectional view of the second mold along line BB in the mold assembly used to form a cylindrical shell;

[0024] Figure 4 This is a schematic diagram of the structure of a mold for forming cylindrical parts by removing the second template and the first mold core, provided in an embodiment of the present invention.

[0025] Figure 5 This is a partial structural diagram of a mold used to form cylindrical components;

[0026] Figure 6 This is a schematic diagram of the assembly structure of the first guide slider, the connector, and the forming slider on a mold used for forming cylindrical parts.

[0027] Figure 7 A cross-sectional schematic diagram of the cylindrical rigid plastic shell provided by the present invention;

[0028] Figure 8 This is a cross-sectional schematic diagram of the cylindrical outer shell provided by the present invention.

[0029] In the picture:

[0030] 100. Mold assembly; 200. Cylindrical outer shell; 101. First inner cavity; 1. First template; 2. Second template; 3. First mold core; 41. First demolding slider; 42. First demolding tie rod; 411. First guide slope; 421. First mating slope; 31. Connecting block; 32. Core; 422. Roller; 412. Strip groove; 43. First clearance slider; 431. First clearance slope; 31. Second clearance slope; 201. Groove; 51. Second demolding slider; 52. Demolding ejector pin; 511. Demolding groove; 53. Second clearance slider; 531. Third clearance slope; 512. Fourth clearance slope; 61. First guide slider; 62. Connecting block; Components; 202, Mounting hole; 63, Molding slider; 611, Second guide slope; 621, Second mating slope; 622, Third guide slope; 631, Third mating slope; 612, Connecting part; 613, Guide part; 623, Guide groove; 624, First slide groove; 632, Slide rail; 633, Second slide groove; 203, Cylindrical hard plastic shell; 10, First mold; 204, Soft plastic; 20, Second mold; 21, Third template; 22, Second inner cavity; 23, Fourth template; 25, Third demolding slider; 26, Second demolding pull rod; 27, Fourth guide slope; 28, Fourth mating slope. Detailed Implementation

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, top, bottom, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship between the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0033] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, the component may be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it may be directly connected to the other component or there may be an intervening component present.

[0034] A mold for molding cylindrical parts is provided; please refer to [reference needed]. Figures 1-5 , Figure 7The mold includes a first template 1, a first demolding slider 41, a second template 2 for closing with the first template 1 to form a first inner cavity 101, a first mold core disposed within the first inner cavity 101 and enclosing the inner wall of the first inner cavity 101 to form a cavity for molding a cylindrical component, and a first demolding pull rod 42 slidably connected to the first demolding slider 41. The first demolding slider 41 is fixedly connected to the second template 2. The first demolding slider 41 is provided with a first guide slope 411. The first demolding pull rod 42 is provided with a first mating slope 421 that cooperates with the first guide slope 411 at one end that is slidably connected to the first demolding slider 41. The end of the first demolding pull rod 42 away from the first demolding slider 41 is fixedly connected to the first mold core 3. The first guide slope 411 and the first mating slope 421 cooperate so that when the mold is opened, the first demolding slider 41 moves with the second template 2, which drives the first demolding pull rod 42 to move in the direction perpendicular to the mold opening and drives the first mold core 3 to detach from the cylindrical component in the direction perpendicular to the mold opening.

[0035] The first guide slope 411 extends from the second template 2 toward the first template 1 in a manner that gradually moves away from the first mold core. When the first demolding slider 41 moves with the second template 2, the first demolding pull rod 42 is movably connected to the first demolding slider 41. The first mating slope 421 slides along the first guide slope 411, causing the first demolding pull rod 42 to drive the first mold core 3 away from the cylindrical component, thus realizing automatic core pulling.

[0036] Preferably, the first mold core 3 includes a connecting block 31 and a core 32 connected to the connecting block 31 and used for molding a cylindrical component. The connecting block 31 is fixedly connected to the first demolding pull rod 42. The core 32 is connected to the side of the connecting block 31 away from the first demolding pull rod 42, and the axial direction of the core 32 is perpendicular to the direction of mold opening. The first guide slope 411 extends from the second template 2 to the first template 1 away from the first mold core 3.

[0037] The core 32 is cylindrical in shape, and the connecting block 31 is used to connect the core 32 and the first demolding tie rod 42. The core 32 is located in the middle of one side of the connecting block 31.

[0038] Preferably, the first demolding pull rod 42 is connected to two rollers 422 at one end near the first demolding slider 41. The two rollers 422 are respectively located on both sides of the first mating inclined surface 421. The first demolding slider 41 is provided with strip grooves 412 for the two rollers 422 to slide. The inclination direction of the strip grooves 412 is the same as the inclination direction of the first guide inclined surface 411.

[0039] Two strip grooves 412 are symmetrically arranged on both sides of the first guide slope 411, and the three are arranged in parallel. The side wall of one strip groove 412, the first guide slope 411, and the side wall of the other strip groove 412 are on the same plane. When the first demolding slider 41 moves with the second template 2, the strip groove 412 restricts the roller 422, thereby driving the roller 422 to roll along the strip groove 412, and then driving the first demolding pull rod 42 to move.

[0040] Preferably, please refer to Figure 2 and Figure 5 The mold for forming cylindrical parts further includes a first clearance slider 43 fixedly connected to the first template 1. The first clearance slider 43 is provided with a first clearance slope 431 whose inclination direction is opposite to that of the first guide slope 411. The first mold core is provided with a second clearance slope 31 that cooperates with the first clearance slope 431.

[0041] The first clearance slider 43 moves along the mold opening direction with the first template 1. Due to the cooperation of the first clearance slope 431 and the second clearance slope 31, the first clearance slider 431 plays a guiding and positioning role for the first mold core 3.

[0042] Preferably, please refer to Figure 2 , Figure 4 , Figure 5 , Figure 7 , Figure 8 Referring to the figure, the mold for forming a cylindrical part further includes a demolding pin 52 and a second demolding slider 51 disposed on the side of the first mold core 3 away from the first demolding slider 41 and used to form a groove 202 on the cylindrical shell. One end of the demolding pin 52 is fixedly connected to the first template 1 and the demolding pin 52 is inclined relative to the first template 1. The second demolding slider 51 is provided with a demolding groove 511 that cooperates with the demolding pin 52. The demolding pin 52 cooperates with the second demolding slider 51 to drive the second demolding slider 51 away from the cylindrical part in the perpendicular mold opening direction when the demolding pin 52 moves with the first template 1 in the mold opening direction.

[0043] The ejector pin 52 moves with the first template 1, and at the same time drives the second ejector slider 51 to move away from the first mold core 3, so that the protrusion (not shown in the figure) on the second ejector slider 51 used to form the groove 202 separates from the groove 202.

[0044] Preferably, the mold for molding the cylindrical component further includes a second clearance slider 53 fixedly connected to the first template 1 and disposed on the side of the second demolding slider 51 away from the first mold core 3. The second clearance slider 53 has a third clearance slope 531 with the same inclination direction as the demolding ejector pin 52, and a fourth clearance slope 512 that cooperates with the third clearance slope 531. The second clearance slider 53 moves together with the first template 1, and serves to guide and position the second demolding slider 51.

[0045] Preferably, please refer to Figure 2 and Figure 5 , Figure 7 , Figure 8 The mold for forming the cylindrical component further includes a first guide slider 61 fixedly connected to the first template 1 and a connector 62 embedded in the first mold core 3. A forming slider 63 for forming the mounting hole 202 on the cylindrical component is slidably connected to the connector 62. The first mold core 3 has a through hole (not shown) for the forming slider 63 to pass through. The first guide slider 61 has a second guide slope 611. The connector 62 has a second mating slope 621 that cooperates with the second guide slope 611. The second guide slope 611 and the second mating slope 621 cooperate to... When the first guide slider 61 moves along the mold opening direction with the first template 1, it drives the connecting member 62 to move along the direction perpendicular to the mold opening. The connecting member 62 is also provided with a third guide slope 622 whose inclination direction is opposite to that of the second guide slope 611. The forming slider 63 is provided with a third mating slope 631 that cooperates with the third guide slope 622. The third guide slope 622 and the third mating slope 631 cooperate so that when the connecting member 62 moves along the direction perpendicular to the mold opening, it drives the forming slider 63 to move from protruding outside the first mold core 3 to retracting into the first mold core 3.

[0046] When the mold is opened, the first guide slider 61 moves with the first template 1. With the cooperation of the second guide slope 611 and the second mating slope 621, the connecting piece 62 tends to move in the direction perpendicular to the mold opening. With the cooperation of the third guide slope 622 and the third mating slope 631, the forming slider 63 is driven to retract into the first mold core 63.

[0047] Preferably, the first guide slider 61 includes a connecting portion 612 fixedly connected to the first template 1 and a connecting portion 612 on the side away from the first template 1. The second guide slope 611 is provided on the guide portion 613 and extends obliquely from the connecting portion 612 toward the second template 2 in a manner that gradually moves away from the forming slider 63.

[0048] The second guide slope is the slope of the first guide slider 61 on the side opposite to the forming slider 63.

[0049] Preferably, the guide portion 613 extends obliquely from the connecting portion 612 toward the second template 2 in a manner that gradually moves away from the forming slider 63, and the connecting member 62 has a guide groove 623 formed on it that cooperates with the guide portion 613.

[0050] Preferably, the connector 62 is provided with a first groove 624, the inner wall surface of the first groove 624 is formed as the third guide slope 622, the forming slider 63 is provided with a slide rail 632 adapted to the first groove 624, and the third mating slope 631 is formed on the slide rail 632.

[0051] The forming slider 63 is embedded in the connector 62 through the cooperation of the slide rail 632 and the first slide groove 624. Furthermore, a second slide groove 633 is formed on the forming slider 63. The second slide groove 633 is arranged adjacent to the slide rail 632, and the side wall of the second slide groove 633 is the side wall of the slide rail 632. The second slide groove 633 is used to cooperate with the side wall of the first slide groove 624.

[0052] The present invention also provides a core-pulling method for performing core pulling on a mold for forming a cylindrical part, comprising the following steps;

[0053] Upon mold opening, the first template 1 and the second template 2 separate, and the first demolding slider 41 moves with the second template 2;

[0054] The first demolding rod 42 moves in the direction perpendicular to demolding by the cooperation of the first guide slope 411 and the first mating slope 421.

[0055] The first mold core 3 moves along the direction perpendicular to demolding with the first demolding pull rod 42.

[0056] The present invention also provides a mold assembly 10 for manufacturing a cylindrical outer shell 200, please refer to... Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8The system includes a first mold 10 for injection molding a cylindrical rigid plastic shell 203 using a first adhesive material and a second mold 20 for injection molding a soft plastic body 204 onto the cylindrical rigid plastic shell 203 using a second adhesive material. The first mold 10 is a mold for molding cylindrical components as described above. The second mold 20 includes a third template 21, a third demolding slider 22, a fourth template 23 for closing with the third template 21 to form a second inner cavity 22, a second mold core disposed within the second inner cavity 22 for fixing the cylindrical rigid plastic shell 203, and a second demolding pull rod 26 slidably connected to the third demolding slider 25. The demolding slider 25 is fixedly connected to the fourth template 23. The third demolding slider 25 is provided with a fourth guide slope 27. The second demolding pull rod 26 is provided with a fourth mating slope 28 that cooperates with the fourth guide slope 27. The end of the second demolding pull rod 26 away from the third demolding slider 25 is fixedly connected to the second mold core. The fourth guide slope 27 and the fourth mating slope 28 cooperate so that when the mold is opened, the third demolding slider 25 moves with the fourth template 23, which drives the second demolding pull rod 26 to move in the direction perpendicular to the mold opening and drives the second mold core to detach from the cylindrical shell 200 in the direction perpendicular to the mold opening.

[0057] The existing stethoscope housing includes a cylindrical hard plastic shell 203 injection molded from hard plastic and a portion injection molded from soft plastic outside the cylindrical hard plastic shell 203. The mounting hole 202 is opened on the cylindrical hard plastic shell 203. In the second mold 20, the third template 21, the third demolding slider 25, the fourth template 23, the second mold core, and the second demolding pull rod 26 correspond one-to-one with the first template 1, the first demolding slider 42, the second template 2, the first mold core 3, and the first demolding pull rod 41 in the first mold 10. The functions and connections of each component are the same. The difference between the second mold 20 and the first mold 10 is that the first mold 10 is used to form the cylindrical hard plastic shell and the mounting hole, while the second mold 20 is used to form the soft plastic part. It can be understood that in the first mold 10, the first mold core is used to form the cylindrical shell, and in the second mold 20, the second mold core is used to fix the cylindrical shell.

[0058] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A mold for injection molding a cylindrical member, characterized by, The first template, the first demolding slider, the second template for forming the first inner cavity with the first template, the first mold core in the first inner cavity and the first demolding pull rod connected with the first demolding slider, the first demolding slider is fixedly connected with the second template, the first demolding slider is provided with the first guide inclined surface, the first demolding pull rod is provided with the first matching inclined surface matched with the first guide inclined surface, the first end of the first demolding pull rod away from the first demolding slider is fixedly connected with the first mold core, and the first guide inclined surface is matched with the first matching inclined surface to make the first demolding slider move with the second template during mold opening to drive the first demolding pull rod to move in the direction perpendicular to the mold opening and drive the first mold core to separate from the cylindrical part in the direction perpendicular to the mold opening. The mold for forming the cylindrical part further comprises a first guide slider fixedly connected with the first template and a connecting piece embedded in the first mold core, the first guide slider is slidably connected with the connecting piece, the connecting piece is slidably connected with a forming slider for forming an installation hole on the cylindrical part, the first mold core is provided with a through hole for the forming slider to pass through, the first guide slider has a second guide inclined surface, the connecting piece is provided with a second matching inclined surface matched with the second guide inclined surface, the second guide inclined surface is matched with the second matching inclined surface to drive the connecting piece to move in the direction perpendicular to the mold opening when the first guide slider moves with the first template in the mold opening direction, the connecting piece is further provided with a third guide inclined surface whose inclination direction is opposite to that of the second guide inclined surface, the forming slider is provided with a third matching inclined surface matched with the third guide inclined surface, and the third guide inclined surface is matched with the third matching inclined surface to drive the forming slider to move from outside the first mold core to retract into the first mold core when the connecting piece moves in the direction perpendicular to the mold opening. The first guide slider comprises a connecting part fixedly connected with the first template and a guide part connected to the side of the connecting part away from the first template, and the first guide inclined surface is arranged on the guide part and extends from the connecting part to the second template in a manner gradually away from the forming slider.

2. The mold for injection molding a cylindrical member according to claim 1, wherein The first mold core comprises a connecting block and a core body connected with the connecting block and used for forming the cylindrical part, the connecting block is fixedly connected with the first demolding pull rod, the core body is connected to the side of the connecting block away from the first demolding pull rod, the axial direction of the core body is perpendicular to the mold opening direction, and the first guide inclined surface extends from the second template to the first template in a manner away from the first mold core; and / or The first demolding pull rod is connected with two rollers at the end close to the first demolding slider, the two rollers are arranged on the two sides of the first matching inclined surface respectively, the first demolding slider is provided with a strip-shaped groove for the two rollers to slide respectively, and the inclination direction of the strip-shaped groove is the same as that of the first guide inclined surface; and / or The mold for forming the cylindrical part further comprises a first position-avoiding slider fixedly connected with the first mold plate, and a first position-avoiding inclined surface is arranged on the first position-avoiding slider and has an opposite inclined direction to the first guide inclined surface.

3. The mold for molding a tubular member according to claim 1, wherein The mold for forming the cylindrical part further comprises an ejection pin and a second ejection slider arranged on a side of the first mold core away from the first ejection slider and used for forming a groove on the cylindrical part, one end of the ejection pin is fixedly connected with the first mold plate and the ejection pin is inclined relative to the first mold plate, a second ejection sliding groove is arranged in the second ejection slider and matched with the ejection pin, and the ejection pin and the second ejection slider are matched to drive the second ejection slider to move away from the cylindrical part in a vertical opening direction when the ejection pin moves along the opening direction with the first mold plate.

4. The mold for molding a tubular member according to claim 3, wherein The mold for forming the cylindrical part further comprises a second position-avoiding slider fixedly connected with the first mold plate and arranged on a side of the second ejection slider away from the first mold core, a third position-avoiding inclined surface is arranged on the second position-avoiding slider and has the same inclined direction as the ejection pin, and a fourth position-avoiding inclined surface is arranged on the second ejection slider and matched with the third position-avoiding inclined surface.

5. The mold for molding a tubular member according to claim 1, wherein The guide portion is inclinedly extended from the connecting portion to the second mold plate in a gradually far-away form from the forming slider, and a guide groove is arranged on the connecting piece and matched with the guide portion.

6. A core-drawing method for drawing a core in the mold for molding a tubular member according to claim 1, characterized by, The method comprises the steps of: opening the mold, the first mold plate and the second mold plate are separated, and the first ejection slider moves with the second mold plate; the first ejection pull rod moves in a vertical ejection direction through the matching of the first guide inclined surface and the first matching inclined surface; the first mold core moves in a vertical ejection direction with the first ejection pull rod.

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