Easily-demolded mold for producing injection molded part

Abstract

The utility model belongs to the technical field of injection molds, and discloses an injection molding part production mold easy to demold, which comprises a bottom mold and a top mold, one side of the surface of the bottom mold far away from the top mold is provided with a material injection port, the surface of the bottom mold is connected with a material injection mechanism, and the lower end of the material injection mechanism is communicated with the material injection port. The middle part of the injection mechanism is connected with a demolding mechanism; the demolding mechanism comprises a sealing pipe communicating with the middle of the material injection mechanism, a left sliding cavity and a right sliding cavity which communicate with each other are formed in the sealing pipe, a sealing sliding block is connected into the sliding cavity far away from the bottom mold in a sealed and sleeved mode, and a connecting rod is connected to the surface of the sealing sliding block. Due to the arrangement of the pneumatic valve, the inside of the air inlet groove can be in a sealed state, so that air entering the air inlet groove can push the sealing sliding block and the connecting rod, air in the material injection port is compressed, an injection molding product can be pushed to be separated from the bottom mold in the mold cavity, and the effect of facilitating demolding is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, in particular to a mold for producing injection molded parts which is easy to demould. Background Art

[0002] An injection mold is a tool for producing plastic products. It can be divided into two types: thermosetting plastic molds and thermoplastic plastic molds according to its molding characteristics. It can be divided into blow molding molds, injection molds, casting molds, injection molds, etc. according to the molding process. Traditional injection molds can be divided into cold runner molds and hot runner molds based on the pouring system. For injection molds, injection molds are a commonly used mold.

[0003] The injection mold mainly consists of two upper and lower cavities. After the mold is closed, the injection slurry is injected, and the slurry can be cooled and formed under the restriction of the mold cavity. However, since the injection slurry has a certain viscosity, there is a connection force between it and the inner wall of the mold cavity after cooling, making it difficult to remove. In addition, the residual injection material in the injection hole further increases the difficulty of demolding, so it needs to be improved. Utility Model Content

[0004] In order to solve the problems raised in the above background technology, the utility model provides a mold for producing injection molded parts which is easy to demould, and has the advantage of easy demould.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mold for producing injection molded parts that is easy to demould, comprising a bottom mold and a top mold, a side of the bottom mold surface away from the top mold is provided with an injection port, the bottom mold surface is connected to an injection mechanism, the lower end of the injection mechanism is communicated with the injection port, and the middle part of the injection mechanism is connected to a demoulding mechanism;

[0006] The demoulding mechanism includes a sealing tube connected to the middle part of the injection mechanism, and two left and right sliding cavities connected to each other are opened inside the sealing tube. A sealing slide is connected to the inner sealing sleeve of a sliding cavity away from the bottom mold, and a connecting rod is connected to the surface of the sealing slide. The other end of the connecting rod extends to the inside of the other sliding cavity and is sealed with the injection port. A return spring is arranged on the outside of the connecting rod, and the two ends of the return spring are respectively connected to the inner wall of the sliding cavity and the sealing slide. An air inlet groove is opened in the middle of the sealing slide and the connecting rod, and a pneumatic valve located in the middle of the air inlet groove is arranged inside the connecting rod. The two ends of the air inlet groove are connected to two demoulding mechanisms, and the two ends of the air inlet groove are connected through the pneumatic valve.

[0007] Preferably, the injection mechanism includes a feed pipe sealed and connected to the top mold, the feed pipe is L-shaped, the lower end of the feed pipe is in a horizontal state connected to the injection port, the lower end of the feed pipe is perpendicular to the bottom mold, and the sealing tube is sealingly sleeved on the horizontal section of the lower end of the feed pipe.

[0008] Preferably, an air intake valve is connected to the top of the horizontal section at the lower end of the feed pipe, a valve core is connected to the internal sealing sleeve of the air intake valve, and a positioning spring located at the bottom of the valve core is connected to the interior of the air intake valve.

[0009] Preferably, the valve core includes a limit frame movably sleeved inside the intake valve, a sealing plug is fixedly connected to the inside of the limit frame, the top of the sealing plug is sealed with the through hole at the top of the intake valve, and a through hole is provided between the limit frame and the sealing plug.

[0010] Preferably, the pneumatic valve includes a positioning valve chamber, a connecting valve chamber and a through valve chamber opened in the middle of the connecting rod, and the three are connected to each other end to end in sequence. The inner diameter of the through valve chamber is larger than the inner diameter of the positioning valve chamber. The two ends of the connecting valve chamber are smoothly connected to the positioning valve chamber and the through valve chamber respectively, and the opposite ends of the positioning valve chamber and the through valve chamber are respectively connected to the two ends of the air inlet groove.

[0011] Preferably, the internal sealing sleeve of the positioning valve cavity is connected with a pneumatic valve body, and a buffer spring is arranged inside the positioning valve cavity, one end of the buffer spring is connected to the pneumatic valve body, and the other end of the buffer spring is connected to and abuts against the inner wall of the through valve cavity.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. Due to the setting of the pneumatic valve, the utility model can make the air inlet groove sealed, so that the air entering the air inlet groove can push the sealing slider and the connecting rod, and then compress the air in the injection port, so that the mold cavity can push the injection molded product away from the bottom mold, thereby achieving the effect of easy demoulding.

[0014] 2. Due to the setting of the connecting valve cavity, the pneumatic valve body of the utility model moves and compresses the buffer spring to a certain strength, so that the air inlet groove can be connected with the injection port, so that the pushing pressure is instantly reduced, avoiding the damage of the injection molded product to the injection molded product due to excessive pushing pressure when demolding is not smooth, and at the same time helping to shake the injection molded product for easy demolding.

[0015] 3. Due to the setting of the connecting rod, the front end of the utility model compresses the residual injection plastic at the lower end of the feed pipe and the injection port on the bottom mold under the cooperation of the sealing slider and the sliding cavity, eliminating burrs and increasing the compactness of the injection plastic in the mold cavity, thereby achieving the effect of injection molding product quality.

[0016] 4. Due to the setting of the valve core, the utility model can facilitate the reset of the connecting rod and the pneumatic valve body, avoiding the situation where the air in the mold cavity is pumped through the small injection port when resetting, thereby ensuring the demoulding process is inconvenient, so that the subsequent continuous action can directly carry out continuous demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a front view of the utility model;

[0019] Figure 3 It is a cross-sectional view of the front side of the demoulding mechanism of the utility model;

[0020] Figure 4 for Figure 3 A partial schematic diagram of the pneumatic valve body;

[0021] Figure 5 It is a structural schematic diagram of the valve core in the utility model.

[0022] In the figure: 1. bottom mold; 2. top mold; 3. injection mechanism; 31. feed pipe; 32. intake valve; 33. valve core; 331. limit frame; 332. sealing plug; 333. through hole; 34. positioning spring; 4. demoulding mechanism; 41. sealing tube; 42. sliding cavity; 43. sealing slider; 44. connecting rod; 45. reset spring; 46. intake groove; 47. pneumatic valve; 471. positioning valve cavity; 472. connecting valve cavity; 473. through valve cavity; 474. pneumatic valve body; 475. buffer spring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figures 1 to 5 As shown, the utility model provides a mold for producing injection molded parts that is easy to demould, comprising a bottom mold 1 and a top mold 2, a material injection port is provided on the surface of the bottom mold 1 away from the top mold 2, a material injection mechanism 3 is connected to the surface of the bottom mold 1, the lower end of the material injection mechanism 3 is communicated with the material injection port, and a demoulding mechanism 4 is connected to the middle of the material injection mechanism 3;

[0025] The demoulding mechanism 4 includes a sealing tube 41 connected to the middle of the injection mechanism 3, and two mutually connected sliding cavities 42 are provided inside the sealing tube 41. A sealing slide block 43 is connected to the inner sealing sleeve of one sliding cavity 42 away from the bottom mold 1, and a connecting rod 44 is connected to the surface of the sealing slide block 43. The other end of the connecting rod 44 extends to the inside of the other sliding cavity 42 and is sealed with the injection port. A return spring 45 is provided outside the connecting rod 44, and the two ends of the return spring 45 are respectively connected to the inner wall of the sliding cavity 42 and the sealing slide block 43. An air inlet groove 46 is provided in the middle of the sealing slide block 43 and the connecting rod 44. A pneumatic valve 47 located in the middle of the air inlet groove 46 is provided inside the connecting rod 44, and the two ends of the air inlet groove 46 are connected to the two demoulding mechanisms 4, and the two ends of the air inlet groove 46 are connected through the pneumatic valve 47.

[0026] Among them, due to the setting of the pneumatic valve 47, the air inlet groove 46 can be sealed, so that the air entering the air inlet groove 46 can push the sealing slider 43 and the connecting rod 44, and then compress the air in the injection port, so that the molded product can be pushed away from the bottom mold 1 in the mold cavity, thereby achieving the effect of facilitating demoulding;

[0027] With the cooperation of the sealing slider 43 and the sliding cavity 42, the front end of the connecting rod 44 compresses the residual injection plastic at the lower end of the feed pipe 31 and the injection port on the bottom mold 1, eliminating burrs while increasing the compactness of the injection plastic in the mold cavity, thereby achieving the effect of injection molding product quality.

[0028] like Figure 3 As shown, the injection mechanism 3 includes a feed pipe 31 sealed and connected to the top mold 2. The feed pipe 31 is L-shaped. The lower end of the feed pipe 31 is in a horizontal state connected to the injection port. The lower end of the feed pipe 31 is perpendicular to the bottom mold 1. The sealing tube 41 is sealed and sleeved on the horizontal section of the lower end of the feed pipe 31.

[0029] like Figure 3 As shown, an air intake valve 32 is connected to the top of the horizontal section at the lower end of the feed pipe 31, and a valve core 33 is connected to the internal sealing sleeve of the air intake valve 32. The interior of the air intake valve 32 is connected to a positioning spring 34 located at the bottom of the valve core 33; due to the arrangement of the valve core 33, the connecting rod 44 and the pneumatic valve body 474 can be easily reset to avoid the situation where the air in the mold cavity is drawn through the small injection port when resetting, thereby ensuring that the demolding progress is inconvenient, so that the subsequent continuous action can directly carry out continuous demolding.

[0030] like Figure 5As shown, the valve core 33 includes a limit frame 331 movably sleeved inside the intake valve 32, and a sealing plug 332 is fixedly connected to the inside of the limit frame 331. The top of the sealing plug 332 is sealed with the through hole at the top of the intake valve 32, and a through hole 333 is provided between the limit frame 331 and the sealing plug 332. Due to the setting of the limit frame 331, it can be ensured that the sealing plug 332 can slide smoothly in the intake valve 32, so that the sealing plug 332 can block the through hole at the top of the intake valve 32, and the setting of the through hole 333 ensures that when the sealing plug 332 is separated from the through hole at the top of the intake valve 32, the upper and lower ends of the valve core 33 can be connected with the upper and lower ends of the inner cavity of the intake valve 32.

[0031] like Figure 3 and Figure 4 As shown, the pneumatic valve 47 includes a positioning valve chamber 471, a connecting valve chamber 472 and a through valve chamber 473 which are opened in the middle of the connecting rod 44. The three are connected to each other end to end in sequence. The inner diameter of the through valve chamber 473 is larger than the inner diameter of the positioning valve chamber 471. The two ends of the connecting valve chamber 472 are smoothly connected to the positioning valve chamber 471 and the through valve chamber 473 respectively. The opposite ends of the positioning valve chamber 471 and the through valve chamber 473 are connected to the two ends of the air inlet groove 46 respectively. Due to the setting of the connecting valve chamber 472, the pneumatic valve body 474 moves and compresses the buffer spring 475 to a certain strength, so that the air inlet groove 46 can be connected to the injection port, so that the pushing pressure is instantly reduced, avoiding the damage to the injection molded product caused by excessive pushing pressure when demolding is not smooth, and at the same time helping to shake the injection molded product for easy demolding.

[0032] like Figure 4 As shown, the internal sealing sleeve of the positioning valve cavity 471 is connected with the pneumatic valve body 474, and a buffer spring 475 is arranged inside the positioning valve cavity 471. One end of the buffer spring 475 is connected to the pneumatic valve body 474, and the other end of the buffer spring 475 is connected to and abuts against the inner wall of the through valve cavity 473.

[0033] The working principle and use process of this utility model:

[0034] After the bottom mold 1 and the top mold 2 are molded together, the injection plastic is injected into the mold cavity of the bottom mold 1 and the top mold 2 through the feed pipe 31. After the injection is completed, air is injected into the air inlet groove 46. Under the blocking of the pneumatic valve 47, the air pushes the sealing slider 43 to move the front end of the connecting rod 44 to the side of the bottom mold 1 and compress the air therein, and then the injection molded product in the bottom mold 1 is pushed under the action of high air pressure to be demoulded quickly. At the same time, the injection plastic remaining at the connection between the feed pipe 31 and the bottom mold 1 is completely pressed into the mold cavity to eliminate the burrs at the injection port;

[0035] As the air in the air inlet groove 46 increases, the air pressure gradually increases and continuously compresses the buffer spring 475. When the pneumatic valve body 474 passes over the positioning valve cavity 471 and enters the connecting valve cavity 472, the air inlet groove 46 is connected with the injection port on the surface of the bottom mold 1 at the lower end of the feed pipe 31, so that the pneumatic valve body 474 loses pressure instantly, and at the same time, the pressure in the bottom mold 1 drops instantly, thereby causing the air pressure to drop suddenly to achieve the purpose of vibration.

[0036] After the air pressure is reduced, the pneumatic valve body 474 blocks the air inlet groove 46 again under the restoring force of the buffer spring 475, and the above-mentioned action can be repeated, thereby achieving continuous vibration so that the molded product can be demoulded smoothly.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mold for producing injection molded parts that is easy to demould, comprising a bottom mold (1) and a top mold (2), characterized in that: A material injection port is provided on a side of the bottom mold (1) away from the top mold (2); a material injection mechanism (3) is connected to the surface of the bottom mold (1); the lower end of the material injection mechanism (3) is connected to the material injection port; and a demoulding mechanism (4) is connected to the middle of the material injection mechanism (3); The demoulding mechanism (4) includes a sealing tube (41) connected to the middle of the injection mechanism (3), and the sealing tube (41) is provided with two mutually connected sliding cavities (42) on the left and right. The inner sealing sleeve of one sliding cavity (42) away from the bottom mold (1) is connected with a sealing slider (43), and the surface of the sealing slider (43) is connected with a connecting rod (44), and the other end of the connecting rod (44) extends to the inside of the other sliding cavity (42) and is sealed with the injection port. A return spring (45) is arranged outside, and the two ends of the return spring (45) are respectively connected to the inner wall of the sliding cavity (42) and the sealing slider (43), and an air inlet groove (46) is provided in the middle of the sealing slider (43) and the connecting rod (44). The connecting rod (44) is provided with a pneumatic valve (47) located in the middle of the air inlet groove (46), and the two ends of the air inlet groove (46) are connected to the two demoulding mechanisms (4), and the two ends of the air inlet groove (46) are connected through the pneumatic valve (47).

2. The mold for producing injection molded parts that is easy to demould according to claim 1, characterized in that: The injection mechanism (3) comprises a feed pipe (31) sealed and connected to the top mold (2); the feed pipe (31) is L-shaped; the lower end of the feed pipe (31) is in a horizontal state connected to the injection port; the lower end of the feed pipe (31) is perpendicular to the bottom mold (1); and the sealing pipe (41) is sealingly sleeved on the horizontal section of the lower end of the feed pipe (31).

3. The mold for producing injection molded parts that is easy to demould according to claim 2, characterized in that: The top of the horizontal section at the lower end of the feed pipe (31) is connected to an air intake valve (32), the interior of the air intake valve (32) is sealed with a valve core (33), and the interior of the air intake valve (32) is connected to a positioning spring (34) located at the bottom of the valve core (33).

4. The mold for producing injection molded parts that is easy to demould according to claim 3, characterized in that: The valve core (33) comprises a limit frame (331) movably sleeved inside the air intake valve (32); a sealing plug (332) is fixedly connected inside the limit frame (331); the top of the sealing plug (332) is sealed with a through hole at the top of the air intake valve (32); and a through hole (333) is provided between the limit frame (331) and the sealing plug (332).

5. The mold for producing injection molded parts that is easy to demould according to claim 1, characterized in that: The pneumatic valve (47) includes a positioning valve chamber (471), a connecting valve chamber (472) and a through valve chamber (473) which are opened in the middle of the connecting rod (44), and the three are connected to each other end to end in sequence. The inner diameter of the through valve chamber (473) is larger than the inner diameter of the positioning valve chamber (471), and the two ends of the connecting valve chamber (472) are smoothly connected to the positioning valve chamber (471) and the through valve chamber (473), respectively. The opposite ends of the positioning valve chamber (471) and the through valve chamber (473) are respectively connected to the two ends of the air inlet groove (46).

6. The mold for producing injection molded parts that is easy to demould according to claim 5, characterized in that: The internal sealing sleeve of the positioning valve cavity (471) is connected with a pneumatic valve body (474), and a buffer spring (475) is arranged inside the positioning valve cavity (471). One end of the buffer spring (475) is connected to the pneumatic valve body (474), and the other end of the buffer spring (475) is connected to and abuts against the inner wall of the through valve cavity (473).

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