Medical injection molding part mold convenient to demold

Abstract

The utility model relates to the technical field of injection molds, in particular to a medical injection molding part mold convenient to demold. The die comprises a lower die body, four guide grooves are formed in the surface of the lower die body, guide columns are connected to the inner walls of the four guide grooves in a sliding mode, an upper die body is fixedly connected to one ends of the four guide columns, a die cavity is connected to the inner wall of the lower die body in a sliding mode, and two circular grooves are formed in the bottom of the inner wall of the lower die body. The inner wall of the circular groove is fixedly connected with a first spring, and the other end of the first spring is fixedly connected with a circular rod. The problems that in a common mold structure, a mold cavity is located on the inner wall of a lower mold, after injection molding is completed, a product is prone to being tightly adhered to the inner wall of the mold cavity, demolding of the product is difficult, meanwhile, most of existing mold guide assemblies depend on cooperation of a plurality of guide columns and guide grooves, the mold opening and closing guide action is achieved, and the production efficiency is poor are solved. And when the mold is opened and closed in a wrong direction, the quality of a product is influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field especially, relates to a medical injection molded part mold convenient to demould. BACKGROUND

[0002] Injection molding is a method of production molding of industrial products. Products are usually made of rubber injection molding and plastic injection molding, and an injection molding machine is the main molding equipment for making various shape plastic products by using thermoplastic or thermosetting material through a plastic molding die. Injection molding is realized through an injection mold. In the production process of medical injection molded parts, the demolding effect of the mold directly affects the quality and production efficiency of the product.

[0003] For the above and the prior art related technology, the inventor believes that the following defects often exist: in the common mold structure, the mold cavity is located on the inner wall of the lower mold. This layout makes it difficult to demold the product after injection molding, and the product is easily tightly adhered to the inner wall of the mold cavity. At the same time, the existing mold guide assembly mostly relies on the cooperation of multiple guide columns and guide grooves to realize the guiding action of mold opening and closing. When the mold opening and closing is in the wrong direction, it will affect the quality of the product. Therefore, a medical injection molded part mold convenient to demold is proposed for the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the shortcoming that in the common mold structure of prior art, the mold cavity is located on the inner wall of the lower mold, which makes it difficult to demold the product after injection molding, and the product is easily tightly adhered to the inner wall of the mold cavity. At the same time, the existing mold guide assembly mostly relies on the cooperation of multiple guide columns and guide grooves to realize the guiding action of mold opening and closing. When the mold opening and closing is in the wrong direction, it will affect the quality of the product. Therefore, a medical injection molded part mold convenient to demold is proposed.

[0005] In order to realize the above purpose, the utility model adopts the following technical scheme: a medical injection molded part mold convenient to demold, including lower mold body, the surface of lower mold body is equipped with four guide grooves, the inner wall of four guide grooves is connected with guide column slidingly, one end of four guide columns is fixedly connected with upper mold body, the inner wall of lower mold body is connected with mold cavity slidingly, the bottom of the inner wall of lower mold body is equipped with two circular grooves, the inner wall of circular groove is fixedly connected with first spring, the other end of first spring is fixedly connected with round rod, the inner wall of circular groove and round rod is connected slidingly, the end away from first spring of two round rods is fixedly connected with mold cavity, the upper surface of lower mold body is equipped with arc slot and polygonal slot, the lower surface of upper mold body is fixedly connected with arc block and polygonal block, the inner wall of arc slot and arc block is connected slidingly, the inner wall of polygonal slot and polygonal block is connected slidingly.

[0006] The effects achieved by the above components are that: through the sliding fit of the guide groove on the lower mold body and the guide column, and the sliding connection of the arc-shaped block and the polygonal block of the upper mold body with the arc-shaped groove and the polygonal groove of the lower mold body respectively, the accurate positioning of the upper and lower molds when the molds are closed is ensured, and the direction error of insertion is avoided; at the same time, the mold cavity is connected with the lower mold body through the first spring and the round rod, and the elasticity of the first spring is utilized, so that the mold cavity can be assisted to rebound upward during demolding, so that the demolding process is more convenient and smooth, and the convenience and production efficiency of the mold are improved.

[0007] Preferably, the lower surface of the arc-shaped block is fixedly connected with an arc-shaped pad, and the lower surface of the polygonal block is fixedly connected with a polygonal pad, and the arc-shaped pad and the polygonal pad are both made of rubber material.

[0008] The effects achieved by the above components are that: the arc-shaped pad and the polygonal pad made of rubber material can play a buffering and damping role when the molds are closed, so as to avoid damage to the polygonal block and the arc-shaped block due to excessive extrusion when the molds are closed.

[0009] Preferably, the surface of the mold cavity is coated with a wear-resistant coating, and the wear-resistant coating is a titanium nitride coating.

[0010] The effects achieved by the above components are that: the titanium nitride wear-resistant coating can significantly improve the surface hardness and wear resistance of the mold cavity, reduce the frictional wear of the mold cavity by the plastic melt during injection molding, reduce the degree of wear, and prolong the service life of the mold cavity.

[0011] Preferably, the two sides of the lower mold body are fixedly connected with U-shaped frames, the inner walls of the U-shaped frames are fixedly connected with fixed rods, the circular arc surfaces of the fixed rods are rotatably connected with L-shaped frames, the L-shaped frames are rotatably connected with threaded rods, the threaded rods penetrate the inner walls of the L-shaped frames, the circular arc surfaces of the threaded rods are threadedly connected with airflow nozzles, the surfaces of the airflow nozzles are communicated with inflation tubes, one end of each threaded rod is fixedly connected with a circular shaft, the surface of each L-shaped frame is provided with a slot, an insertion rod is slidably inserted into each U-shaped frame, the insertion rod is slidably connected with the inner wall of the slot of the L-shaped frame, and one end of the insertion rod is fixedly connected with a circular block.

[0012] The effects achieved by the above components are that: the rotatable L-shaped frame and the airflow nozzle are arranged on the two sides of the lower mold body, the position of the airflow nozzle can be conveniently adjusted through the threaded rod, the direction of the air jet can be flexibly adjusted according to the injection molding requirements, the airflow can be injected into the inflation tube to assist demolding during demolding, and the mold cavity can also be used for cleaning, thereby avoiding traditional manual wiping and the continuous wear of the mold, and the demolding efficiency and the cleanliness of the mold are improved.

[0013] Preferably, the circular arc surface of the circular shaft is provided with a plurality of anti-skid grooves, and the plurality of anti-skid grooves are arranged in a circumferential array.

[0014] The effect achieved by the above components is that the anti-skid groove can increase the friction force when the operator's hand contacts the round shaft, can effectively prevent hand slipping when adjusting the position of the airflow nozzle, makes the operation process more stable and convenient, and improves the accuracy and efficiency of the adjustment operation.

[0015] Preferably, the arc surface of the inserting rod is sleeved with a second spring, and two ends of the second spring are fixedly connected with the circular block and the U-shaped frame respectively.

[0016] The effect achieved by the above components is that when the inserting rod is aligned with the L-shaped frame slot, the elastic force of the second spring can drive the inserting rod to be automatically inserted into the inner wall of the L-shaped frame slot, thereby improving the convenience.

[0017] Preferably, the arc surface of the fixing rod is sleeved with two torsional springs, and two ends of the torsional springs are fixedly connected with the U-shaped frame and the L-shaped frame respectively.

[0018] The effect achieved by the above components is that when the fixing of the L-shaped frame is released, the torsional force of the torsional spring can drive the L-shaped frame to be automatically rotated downward on the arc surface of the fixing rod and be folded, and after being folded, the L-shaped frame is parallel to the lower mold body and is in a stable state without shaking, and the occupied space is reduced.

[0019] In summary, the beneficial effects of the utility model are as follows:

[0020] In the utility model, the guide groove and the guide column on the lower mold body are in sliding fit, and the arc block and the polygonal block of the upper mold body are in sliding connection with the arc-shaped slot and the polygonal slot of the lower mold body respectively, so that the accurate positioning of the upper and lower molds when the molds are closed is ensured, and the direction of insertion is avoided to be wrong; meanwhile, the mold cavity is connected with the lower mold body through the first spring and the circular rod, and the elasticity of the first spring is utilized, so that the mold cavity can be assisted to rebound upward when the mold is demolded, the demolding process is more convenient and smooth, and the convenience and production efficiency of the mold are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0022] Figure 2 It is a sectional view of the lower mold body in the utility model;

[0023] Figure 3 It is a structure schematic view of the U-shaped frame in the utility model;

[0024] Figure 4 It is a structure schematic view of the airflow nozzle in the utility model.

[0025] Legend: 1, lower mold body; 2, guide groove; 3, guide column; 4, upper mold body; 5, mold cavity; 6, round groove; 7, first spring; 8, round rod; 9, arc-shaped groove; 10, polygonal groove; 11, arc-shaped block; 12, polygonal block; 13, arc-shaped pad; 14, polygonal pad; 15, U-shaped frame; 16, fixed rod; 17, L-shaped frame; 18, insertion rod; 19, round block; 20, threaded rod; 21, round shaft; 22, air flow nozzle; 23, inflation tube; 24, anti-skid groove; 25, second spring; 26, torsion spring. DETAILED DESCRIPTION

[0026] REFERENCE Figures 1-4The utility model provides a kind of medical injection molding piece mould of convenient demoulding, including lower mould body 1, the surface of lower mould body 1 is equipped with four guide slots 2, the inner wall of four guide slots 2 is slidably connected with guide column 3, one end of four guide columns 3 is fixedly connected with upper mould body 4, the inner wall of lower mould body 1 is slidably connected with mould cavity 5, the bottom of the inner wall of lower mould body 1 is equipped with two circular grooves 6, the inner wall of circular groove 6 is fixedly connected with first spring 7, the other end of first spring 7 is fixedly connected with round bar 8, round bar 8 is slidably connected with the inner wall of circular groove 6, the end of two round bars 8 away from first spring 7 is fixedly connected with mould cavity 5, the upper surface of lower mould body 1 is equipped with arc slot 9 and polygonal slot 10, the lower surface of upper mould body 4 is fixedly connected with arc block 11 and polygonal block 12, arc block 11 is slidably connected with the inner wall of arc slot 9, polygonal block 12 is slidably connected with the inner wall of polygonal slot 10, by guide slot 2 and guide column 3 of the sliding fit on lower mould body 1, and arc block 11, polygonal block 12 of upper mould body 4 are slidably connected with arc slot 9, polygonal slot 10 of lower mould body 1 respectively, the accurate positioning when upper and lower moulds are closed is guaranteed, and the direction of insertion is avoided to be wrong.Meanwhile, the cavity 5 is connected with the lower die body 1 through the first spring 7 and the round rod 8, and the elasticity of the first spring 7 can assist the cavity 5 to rebound upward during demolding, so that the demolding process is more convenient and smooth, the convenience and production efficiency of the mold are improved, the lower surface of the arc block 11 is fixedly connected with an arc pad 13, the lower surface of the polygonal block 12 is fixedly connected with a polygonal pad 14, the arc pad 13 and the polygonal pad 14 are made of rubber material, the arc pad 13 and the polygonal pad 14 made of rubber material can play a buffering and damping role during mold closing, so that the polygonal block 12 and the arc block 11 are prevented from being damaged due to excessive extrusion during mold closing, the surface of the cavity 5 is coated with a wear-resistant coating, the wear-resistant coating is a titanium nitride coating, the titanium nitride wear-resistant coating can significantly improve the surface hardness and wear resistance of the cavity 5, reduce the friction loss of the plastic melt to the cavity 5 during injection molding, reduce the degree of wear, prolong the service life of the cavity 5, the two sides of the lower die body 1 are fixedly connected with U-shaped frames 15, the inner walls of the U-shaped frames 15 are fixedly connected with fixed rods 16, the circular arc surfaces of the fixed rods 16 are rotatably connected with L-shaped frames 17, the L-shaped frames 17 are rotatably connected with threaded rods 20, the threaded rods 20 penetrate the inner walls of the L-shaped frames 17, the circular arc surfaces of the threaded rods 20 are threadedly connected with airflow nozzles 22, the surfaces of the airflow nozzles 22 are communicated with inflation tubes 23, one end of the threaded rod 20 is fixedly connected with a circular shaft 21, the surface of the L-shaped frame 17 is provided with a slot, an insertion rod 18 is slidably inserted into the U-shaped frame 15, one end of the insertion rod 18 is fixedly connected with a circular block 19, the surface of the L-shaped frame 17 is provided with a slot, the insertion rod 18 is slidably connected with the inner wall of the slot of the L-shaped frame 17, the end of the insertion rod 18 is fixedly connected with a circular block 19, the L-shaped frame 17 and the airflow nozzle 22 on the two sides of the lower die body 1 can be rotatably adjusted, the position of the airflow nozzle 22 can be conveniently adjusted through the threaded rod 20, the direction of the air jet can be flexibly adjusted according to the injection molding requirements, the airflow injected into the inflation tube 23 can be used to assist demolding, and the cavity 5 can also be used for cleaning, so that the mold is not continuously worn and torn by traditional manual wiping, the demolding efficiency and the cleanliness of the mold are improved, the circular arc surface of the circular shaft 21 is provided with a plurality of anti-skid grooves 24, the plurality of anti-skid grooves 24 are arranged in a circular array, the anti-skid grooves 24 can increase the friction force between the hands of the operator and the circular shaft 21 when the hands contact the circular shaft 21, when the circular shaft 21 is rotated to adjust the position of the threaded rod 20 and the airflow nozzle 22, the hands can be effectively prevented from slipping, so that the operation process is more stable and convenient, the accuracy and efficiency of the adjustment operation are improved, the circular arc surface of the insertion rod 18 is sleeved with a second spring 25, the two ends of the second spring 25 are fixedly connected with the circular block 19 and the U-shaped frame 15, when the insertion rod 18 is aligned with the slot of the L-shaped frame 17, the elastic force of the second spring 25 will drive the insertion rod 18 to automatically insert into the inner wall of the slot of the L-shaped frame 17, the convenience is improved, the circular arc surface of the fixed rod 16 is sleeved with two torsional springs 26, the two ends of the torsional spring 26 are fixedly connected with the U-shaped frame 15 and the L-shaped frame 17, when the fixation of the L-shaped frame 17 is released, the torsional force of the torsional spring 26 will drive the L-shaped frame 17 to automatically rotate downward on the circular arc surface of the fixed rod 16 and be collected, after being collected, the L-shaped frame 17 is parallel to the lower die body 1 and is in a stable and non-shaking state, and the occupied space is reduced.

[0027] The working principle is that, in the mold closing stage, the lower mold body 1 is precisely positioned by the sliding fit of the guide groove 2 and the guide column 3, and the sliding connection of the arc-shaped groove 9 and the polygonal groove 10 with the arc-shaped block 11 and the polygonal block 12 of the upper mold body 4 respectively, so that the mold closing is accurate and no error is caused, and the arc-shaped pad 13 and the polygonal pad 14 made of rubber material play the role of buffering and shock absorption to protect the mold parts; after injection molding is completed and the demolding stage is entered, the mold cavity 5 is connected with the lower mold body 1 through the first spring 7 and the round rod 8, the elastic force of the first spring 7 assists the upward rebound of the mold cavity 5, and the power-assisted demolding is realized; in addition, the operator can push the L-shaped frame 17 to rotate upward on the circular arc surface of the fixed rod 16, when the L-shaped frame 17 slot is aligned with the insertion rod 18, the elastic force of the second spring 25 will drive the insertion rod 18 to be automatically inserted into the slot, at this time, the circular shaft 21 with the anti-skid groove 24 can be rotated, thereby driving the threaded rod 20 in the L-shaped frame 17 to adjust the direction of the airflow nozzle 22, then the gas is injected into the airflow nozzle 22 through the inflation pipe 23, and the airflow is further injected into the mold cavity 5 to assist demolding, and the mold cavity 5 can also be cleaned by using the airflow; when the airflow nozzle 22 is not needed to be used to release the fixation of the L-shaped frame 17, the torsional force of the torsional spring 26 will drive the L-shaped frame to automatically rotate downward and be retracted, so that the occupied space is reduced and stability is maintained.

[0028] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection", "connection" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be directly connected, also can be indirectly connected through intermediate medium, can be the intercommunication of two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood through specific circumstances.

Claims

1. A medical injection moulding part mould facilitating demoulding, comprising a lower mould body (1), characterised in that: The surface of the lower mold body (1) is provided with four guide grooves (2), the inner walls of the four guide grooves (2) are all slidably connected with guide columns (3), one end of the four guide columns (3) is fixedly connected with an upper mold body (4), the inner wall of the lower mold body (1) is slidably connected with a mold cavity (5), the bottom of the inner wall of the lower mold body (1) is provided with two circular grooves (6), the inner wall of the circular groove (6) is fixedly connected with a first spring (7), the other end of the first spring (7) is fixedly connected with a circular rod (8), the circular rod (8) is slidably connected with the inner wall of the circular groove (6), the ends, away from the first spring (7), of the two circular rods (8) are fixedly connected with the mold cavity (5), the upper surface of the lower mold body (1) is provided with an arc-shaped groove (9) and a polygonal groove (10), the lower surface of the upper mold body (4) is fixedly connected with an arc-shaped block (11) and a polygonal block (12), the arc-shaped block (11) is slidably connected with the inner wall of the arc-shaped groove (9), and the polygonal block (12) is slidably connected with the inner wall of the polygonal groove (10).

2. A medical injection molded part mold facilitating demolding according to claim 1, characterized in that: The lower surface of the arc-shaped block (11) is fixedly connected with an arc-shaped pad (13), the lower surface of the polygonal block (12) is fixedly connected with a polygonal pad (14), and the arc-shaped pad (13) and the polygonal pad (14) are both made of rubber.

3. A medical injection molded part mold facilitating demolding according to claim 1, characterized in that: The surface of the mold cavity (5) is coated with a wear-resistant coating, and the wear-resistant coating is a titanium nitride coating.

4. A medical injection molded part mold facilitating demolding according to claim 1, characterized in that: Both sides of the lower mold body (1) are fixedly connected with U-shaped frames (15), the inner wall of the U-shaped frame (15) is fixedly connected with a fixed rod (16), the circular arc surface of the fixed rod (16) is rotatably connected with an L-shaped frame (17), the L-shaped frame (17) is rotatably connected with a threaded rod (20), the threaded rod (20) penetrates through the inner wall of the L-shaped frame (17), the circular arc surface of the threaded rod (20) is threadedly connected with an airflow nozzle (22), the surface of the airflow nozzle (22) is connected with an inflating pipe (23), one end of the threaded rod (20) is fixedly connected with a circular shaft (21), the surface of the L-shaped frame (17) is provided with a slot, the U-shaped frame (15) is slidably inserted with a plug rod (18), the plug rod (18) is slidably connected with the inner wall of the slot of the L-shaped frame (17), and one end of the plug rod (18) is fixedly connected with a circular block (19).

5. A medical injection molded part mold facilitating demolding according to claim 4, characterized in that: The circular arc surface of the circular shaft (21) is provided with a plurality of anti-skid grooves (24), and the plurality of anti-skid grooves (24) are arranged in a circular array.

6. A medical injection molded part mold facilitating demolding according to claim 4, characterized in that: The circular arc surface of the plug rod (18) is sleeved with a second spring (25), and the two ends of the second spring (25) are fixedly connected with the circular block (19) and the U-shaped frame (15) respectively.

7. A medical injection molded part mold facilitating demolding according to claim 4, characterized in that: The circular arc surface of the fixed rod (16) is sleeved with two torsional springs (26), and the two ends of the torsional spring (26) are fixedly connected with the U-shaped frame (15) and the L-shaped frame (17) respectively.

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