Injection mold

Abstract

The utility model provides an injection mold which is used for preparing an insertion tube comprising a straight section and an arc section which are communicated with each other. The injection mold comprises a mold body, a straight mold core, an arc mold core and a first driving mechanism. The mold body comprises a first mold base and a second mold base, an injection molding cavity matched with a to-be-prepared insertion tube in shape is formed in the mold body, and the injection molding cavity comprises a straight cavity section corresponding to the straight section and an arc cavity section corresponding to the arc section; the straight mold core is arranged on the first mold base, and the arc mold core is arranged on the first mold base or the second mold base; the first driving mechanism comprises a first structure arranged on the first die holder and a second structure arranged on the second die holder; the straight mold core is connected to the first structure, the first structure and the second structure are matched during mold closing, the second structure drives the first structure so that the straight mold core can move into the straight cavity section, and after the first mold base and the second mold base are closed, the straight mold core is connected with the arc mold core located in the arc cavity section. The problems of length deviation of intubation tubes and incompatibility of inner and outer intubation tubes are solved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an injection mold. Background Technology

[0002] Tracheostomy intubation is widely used in anesthesiology and pulmonology, primarily for performing tracheostomy surgery. The main procedure of tracheostomy involves cutting open the cervical trachea and inserting a tracheostomy tube to relieve respiratory distress caused by laryngeal dyspnea, respiratory dysfunction, or accumulation of secretions in the lower respiratory tract.

[0003] According to Clause 6.1 of YY / T 0338-2023, "Tracheostomy Tubes and Connectors," the endotracheal tube should have appropriate curvature to adapt to the physiological structure of the trachea. According to Clause 6.3.3 of YY / T 0338-2023, regarding the length of the internal and external endotracheal tubes, the length of the internal endotracheal tube should be within ±1 mm of the length of the patient end of the external endotracheal tube. However, some internal and external endotracheal tubes manufactured in related technologies fail to meet the length requirements of Clause 6.3.3, and there are also technical problems such as fitting difficulties caused by significant length deviations between the internal and external endotracheal tubes. Therefore, these problems urgently need to be solved in this field. Utility Model Content

[0004] This invention provides an injection mold to solve the problem of length deviation in the preparation of insertion tubes in related technologies.

[0005] The solution to achieve the technical objective of this utility model is an injection mold for preparing a tube, the tube comprising a straight section and an arc section connected together; the injection mold comprises a mold body, a straight mold core, an arc mold core and a first driving mechanism;

[0006] The mold body includes a first mold base and a second mold base. After the first mold base and the second mold base are closed, an injection cavity matching the shape of the insertion tube to be prepared is formed in the mold body. The injection cavity includes a straight cavity segment corresponding to the straight segment and an arc cavity segment corresponding to the arc segment.

[0007] A straight mold core is located on the first mold base, and an arc-shaped mold core is located on either the first mold base or the second mold base;

[0008] The first drive mechanism includes a first structure and a second structure, wherein the first structure is movably disposed on the first mold base and the second structure is disposed on the second mold base;

[0009] Wherein: the straight mold core is connected to the first structure, the first structure and the second structure are aligned and fitted when the mold is closed, the second structure drives the first structure to move the straight mold core into the straight cavity section, after the first mold base and the second mold base are closed, the straight mold core is connected to the arc mold core located in the arc cavity section.

[0010] In one alternative embodiment, the first structure and the second structure are aligned and fitted during mold opening, and the second structure can drive the first structure to reset so that the straight mold core can be moved out of the straight cavity section along the axial direction of the straight mold core.

[0011] In one optional embodiment, the first structure includes a driving block, a straight mold core is connected to the driving block, and the second structure includes a pressure bar inclinedly disposed on the second mold base. The driving block is slidably disposed on the first mold base along the axial direction of the straight mold core, and the driving block has an inclined mating through hole corresponding to the pressure bar.

[0012] When the mold is closed, the pressure rod extends into the mating through hole and drives the drive block to move towards the straight cavity section; when the mold is opened, the pressure rod moves away from the mating through hole and drives the drive block away from the straight cavity section.

[0013] In one optional embodiment, the second structure further includes a wedge portion, and the first structure further includes an inclined surface on the drive block that matches the wedge surface of the wedge portion. When the first mold base and the second mold base are closed, the drive block and the inclined surface of the wedge portion cooperate to drive the drive block to slide towards the direction of the straight cavity section.

[0014] In one optional embodiment, the injection mold further includes a second drive mechanism, the arc-shaped mold core being drivenly connected to the second drive mechanism, the second drive mechanism driving the arc-shaped mold core to rotate, so that the arc-shaped mold core can be moved into and out of the arc-shaped cavity.

[0015] In one optional embodiment, the second driving mechanism includes a turntable and a power component. The turntable is rotatably mounted on the second mold base, and the power component is drively connected to the turntable. The power component is used to drive the turntable to rotate. The arc-shaped mold core is connected to the turntable, and the arc-shaped mold core and the turntable are concentrically arranged to rotate synchronously.

[0016] In one alternative embodiment, the power assembly includes a rack and a power element that are connected in a transmission manner. The circumferential side of the turntable is provided with meshing teeth that mesh with the rack. The power element drives the rack to move relative to the turntable.

[0017] In one optional embodiment, the injection cavity includes a first injection cavity and a second injection cavity corresponding one-to-one with the two cannulas, and both the first injection cavity and the second injection cavity have a straight cavity segment and an arc-shaped cavity segment;

[0018] There are two arc-shaped mold cores and two straight mold cores. One arc-shaped mold core and one straight mold core form a set and correspond to the straight section and arc-shaped section of a tube, respectively. The two straight mold cores are arranged coaxially or the axes of the two straight mold cores are parallel.

[0019] When the first mold base and the second mold base are closed, the first driving mechanism drives the two straight mold cores to approach each other and move into the straight cavity section of the first injection cavity and the straight cavity section of the second injection cavity, respectively.

[0020] In one optional embodiment, the first mold base and the second mold base are closed to form a receiving cavity. The mold body also includes a cavity component, which is detachably connected to at least one of the first mold base and the second mold base. The injection cavity is formed on the cavity component. The cavity component, the straight mold core, and the arc mold core are all located in the receiving cavity.

[0021] In one alternative embodiment, at least one of the first mold base and the second mold base has a cooling water channel inside.

[0022] According to the injection mold of the above embodiment, the first driving mechanism includes a first structure movably disposed on a first mold base and a second structure disposed on a second mold base. The first structure is connected to a straight mold core. During the mold closing process, through the alignment and cooperation of the first and second structures, the first structure can drive the straight mold core to move into the straight cavity section and connect with the arc mold core located in the arc cavity section. Then, the injection molding operation can be performed to prepare the required insert. After the mold body is closed, a straight cavity section corresponding to the straight section of the insert and an arc cavity section corresponding to the arc section of the insert can be formed inside. The straight cavity section and the arc cavity section are connected to allow the injection molding material to flow.

[0023] On the one hand, the straight mold core and the arc mold core define the size and shape of the inner cavity wall of the insert, while the arc cavity segment and the arc mold core directly define the shape and size of the arc segment of the insert. In the mold-closed state, the straight mold core and the arc mold core are connected, allowing for integral injection molding of the corresponding insert. Compared to existing technologies, this eliminates the need for thermoforming the injection-molded flexible tube, thus avoiding thermal deformation. The shape and size of the insert are directly determined by the injection mold, effectively avoiding length deviations between the inner and outer inserts and assembly difficulties. On the other hand, during the mold-closing process, the first structure drives the straight mold core to move on the first mold base. Utilizing the high precision characteristics of the mold, the straight mold core can accurately reach the straight cavity segment and connect with the arc mold core located in the arc cavity segment, improving the dimensional accuracy of the final product and increasing the product yield. Therefore, the injection mold provided in this application can simultaneously improve the quality of individual insert products and enhance the fitting accuracy between the inner and outer inserts. Attached Figure Description

[0024] Figure 1 This is an overall schematic diagram of the injection mold in the closed state provided in some embodiments of this application.

[0025] Figure 2 for Figure 1 A top view of the injection mold.

[0026] Figure 3 for Figure 2 AA section view in the image.

[0027] Figure 4 for Figure 1 An exploded view of the injection mold in the closed state, before injection molding and with the insertion tube present.

[0028] Figure 5 for Figure 4 Another perspective illustration.

[0029] Figure 6 for Figure 1 A schematic diagram of the injection molding tube in the molded state.

[0030] Figure 7 This is a structural schematic diagram of the first mold base and the components on the first mold base.

[0031] Figure 8 for Figure 7 A schematic diagram with some parts of the structure omitted.

[0032] Reference numerals: 100-Injection mold; 10-Mold body; 11-First mold base; 12-Second mold base; 121-Stepped through hole; 13-Injection cavity; 131-Straight cavity segment; 132-Arc-shaped cavity segment; 133-First injection cavity; 134-Second injection cavity; 14-Cavity component; 15-Cap plate; 20-Straight mold core; 30-Arc-shaped mold core; 40-First drive mechanism; 41-First structure; 411-Drive block; 4111-Matching through hole; 412-Sloping surface; 42-Second structure; 421-Pressure bar component; 4211-Stepped portion; 422-Wedge portion; 50-Second drive mechanism; 51-Turntable; 52-Rack; 53-Power component; 60-Cooling pipe;

[0033] 200 - Intubation tube; 210 - Straight section; 220 - Arc section. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0035] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0036] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0037] Currently, the common method for forming tracheostomy tubes is horizontal injection molding, resulting in a straight tube. Subsequently, heating is used to shape it into an arc segment. Since the main material of tracheostomy tubes is mostly soft plastic, such as polyvinyl chloride (PVC) and polyethylene (PE), these materials have high shrinkage rates. For example, PVC has a shrinkage rate of 1.6%–2.0%, and PE has a shrinkage rate of 1.5%–3.5%. During the heat-setting process, due to material shrinkage and stress release, the length of the tube may become difficult to control, and the dimensions may become uneven. In the fitting process of internal and external tubes, length inconsistencies may occur, such as the internal tube being too long or too short. According to Clause 6.3.3 of YY / T 0338-2023 regarding the length of internal and external tubes, the length of the internal tube should be within ±1mm of the length of the external tube used at the patient's end. However, the inner and outer tubes produced by the traditional horizontal injection molding combined with heat setting method are prone to not meeting the length error range specified in the YY / T 0338-2023 standard, which leads to a large length deviation when assembling the inner and outer tubes, resulting in fitting difficulties.

[0038] To address the problems of inconsistent lengths and difficulty in fitting inner and outer inserts due to deformation caused by heat setting in existing molding processes, this invention proposes an injection mold for manufacturing inserts. Please refer to [reference needed]. Figure 6 The insertion tube 200 includes a straight section 210 and an arc section 220 that are connected. The shaped insertion tube 200 can be directly prepared by the injection mold 100, which avoids the problem of length change caused by material shrinkage in the intermediate product shaping process of related technologies, thereby reducing the probability of size mismatch when assembling the inner and outer insertion tubes.

[0039] Please refer to Figures 1-8The injection mold 100 includes a mold body 10, a straight mold core 20, an arc mold core 30, and a first drive mechanism 40. The straight mold core 20 and the arc mold core 30 correspond to the straight section 210 and the arc section 220 of the insertion tube 200, respectively. During injection molding, the injection molding material covers the straight mold core 20 and the arc mold core 30 to form the inner cavity of the insertion tube 200.

[0040] The mold body 10 includes a first mold base 11 and a second mold base 12. After the first mold base 11 and the second mold base 12 are closed, an injection cavity 13 matching the shape of the insertion tube 200 to be prepared is formed inside the mold body 10. The injection cavity 13 includes a straight cavity section 131 corresponding to the straight section 210 and an arc cavity section 132 corresponding to the arc section 220. The first drive mechanism 40 includes a first structure 41 and a second structure 42. The first structure 41 is movably disposed on the first mold base 11, and the second structure 42 is disposed on the second mold base 12. A straight mold core 20 is disposed on the first mold base 11, and an arc mold core 30 is disposed on the first mold base 11 or the second mold base 12. The straight mold core 20 is connected to the first structure 41. The first structure 41 and the second structure 42 are aligned and engaged when the mold is closed. The second structure 42 drives the first structure 41 to move the straight mold core 20 into the straight cavity section 131. After the first mold base 11 and the second mold base 12 are closed in place, the straight mold core 20 is connected to the arc mold core 30 located in the arc cavity section 132.

[0041] The mold body 10 is made of high-strength, high-wear-resistant and corrosion-resistant materials to ensure the service life of the mold body 10 and the precision of the injection molded product.

[0042] According to the injection mold 100 of the above embodiment, the first driving mechanism 40 includes a first structure 41 movably disposed on the first mold base 11 and a second structure 42 disposed on the second mold base 12. The first structure 41 is connected to the straight mold core 20. During the mold closing process, through the alignment and cooperation of the first structure 41 and the second structure 42, the first structure 41 can drive the straight mold core 20 to move into the straight cavity section 131 and connect with the arc mold core 30 located in the arc cavity section 132. Then, the injection molding operation can be performed to prepare the required tube 200. After the mold body 10 is closed, the interior can form a straight cavity section 131 corresponding to the straight section 210 of the tube 200 and an arc cavity section 132 corresponding to the arc section 220 of the tube 200. The straight cavity section 131 and the arc cavity section 132 are connected to allow the injection molding material to flow.

[0043] On the one hand, the straight mold core 20 and the arc mold core 30 define the size and shape of the inner cavity wall of the insertion tube 200. The arc cavity segment 132 and the arc mold core 30 directly define the shape and size of the arc segment 220 of the insertion tube 200. In the mold-closed state, the straight mold core 20 and the arc mold core 30 are connected and can be integrally injection molded to form the corresponding insertion tube 200. Compared with the existing technology, there is no need to perform thermoforming on the injection-molded flexible tube, which can avoid thermal deformation. The shape and size of the insertion tube 200 are directly determined by the injection mold 100, which can effectively avoid the technical problems of length deviation between the inner and outer insertion tubes and assembly difficulties. On the other hand, during the mold-closing process, the first structure 41 drives the straight mold core 20 to move on the first mold base 11. Utilizing the high precision characteristics of the mold, the straight mold core 20 can accurately reach the straight cavity segment 131 and connect with the arc mold core 30 located in the arc cavity segment 132. This can improve the dimensional accuracy of the final product and help improve the product qualification rate. Therefore, the injection mold 100 provided in this application can simultaneously improve the quality of a single insertion tube 200 product and improve the fitting accuracy between the inner and outer insertion tubes.

[0044] It should be noted that this application does not limit the specific demolding scheme of the obtained insert 200. Any feasible scheme in the related technology can be adopted, and those skilled in the art can make adaptive adjustments based on the requirements of this application. In one feasible embodiment, the injection mold 100 can be configured as a manual demolding scheme. In other embodiments, the injection mold 100 can also be configured as an automatic demolding device, such as by adding an additional core-pulling mechanism for performing core-pulling operations on the straight mold core 20 and the arc mold core 30. Taking the core-pulling of the straight mold core 20 as an example, in another feasible embodiment, the first drive mechanism 40 can also be directly used as the core-pulling mechanism for performing core-pulling operations on the straight mold core 20 when the product is demolded. In this case, it can be a manual core-pulling scheme in which the first structure 41 and the straight mold core 20 are manually reset for core-pulling. Alternatively, the first drive mechanism 40 can be configured as a device in which the first structure 41 can be automatically reset when the mold is opened.

[0045] The injection mold 100 provided in this embodiment, the structure required for the injection function of the mold body 10, and other unmentioned structures can all refer to related technologies. For example, the mold body 10 has an injection channel for injecting injection material, and the injection cavity 13 is connected to the injection channel. Those skilled in the art should understand that the injection channel can be formed on at least one of the first mold base 11 and the second mold base 12, which will not be elaborated here.

[0046] In some embodiments, please refer to Figure 1 and Figure 3The first structure 41 and the second structure 42 are configured to align and engage during mold opening, so that the second structure 42 can drive the first structure 41 to reset, and the straight mold core 20 can move out of the straight cavity section 131 along the axial direction of the straight mold core 20. In other words, the straight mold core 20 moves into and out of the straight cavity section 131 along the axial direction of the straight mold core 20. On the one hand, the reciprocating movement of the straight mold core 20 is achieved by utilizing the relative engagement of the first structure 41 and the second structure 42 during mold closing and opening, thereby realizing the automatic core pulling of the straight mold core 20, enabling the product to be at least partially demolded, which helps to reduce the difficulty of product demolding. On the other hand, the straight mold core 20 and the straight section 210 of the manufactured insert 200 are kept coaxial, which helps to reduce the damage to the surface of the prepared product caused by the core pulling operation during mold opening, so as to ensure the surface quality and yield of the product.

[0047] This application does not specifically limit the transmission scheme of the first structure 41 and the straight mold core 20. Any feasible scheme from related technologies can be used, as long as it can convert the motion of the first structure 41 into axial movement of the straight mold core 20. For example, in some embodiments, the first structure 41 and the straight mold core 20 can be equipped as a worm gear assembly, so that when the first structure 41 rotates, it can drive the straight mold core 20 to move linearly along the axial direction. In this case, the second structure 42 and the first structure 41 can utilize the transmission principle of the gear and rack 52 to drive the first structure 41 to rotate. In other embodiments, the first structure 41 can also be slidably disposed on the first mold base 11 along the axial direction of the straight mold core 20, and the second structure 42 is configured to drive the first structure 41 to reciprocate.

[0048] In some embodiments, please refer to Figures 3-8To simplify the structure of the injection mold 100 and control its cost and volume, the first structure 41 includes a drive block 411, and the second structure 42 includes a pressure rod 421 inclinedly disposed on the second mold base 12. The drive block 411 is slidably disposed on the first mold base 11 along the axial direction of the straight mold core 20. The straight mold core 20 is connected to the drive block 411, and the drive block 411 has an inclined mating through hole 4111 corresponding to the pressure rod 421. When the mold is closed, the pressure rod 421 extends into the mating through hole 4111 and drives the drive block 411 to move towards the straight cavity section 131. When the mold is opened, the pressure rod 421 moves away from the mating through hole 4111 and drives the drive block 411 away from the straight cavity section 131. This realizes the forward and backward movement of the straight mold core 20 in the axial direction. The straight mold core 20 moves forward when the mold is closed and backward when the mold is opened. At this time, the principle of the pressure bar 421 driving the driving block 411 can be referred to the driving principle when the wedge and inclined surface are engaged. By utilizing the mutual engagement of the inclined pressure bar 421 and the hole wall of the engaging through hole 4111 of the driving block 411 during the mold opening and closing process, the reciprocating movement of the driving block 411 and the core pulling of the straight mold core 20 can be realized. There is no need to set up elastic parts or other components to make the driving block 411 automatically reset, which effectively simplifies the structure of the injection mold 100 and helps to reduce the difficulty of assembly.

[0049] The aforementioned tilt refers to the angle between the mold closing direction and the mold opening direction. The specific tilt angle can be adjusted adaptively according to the required travel distance.

[0050] In some embodiments, please refer to Figure 3 The pressure rod 421 has a stepped portion 4211 at one end connected to the second mold base 12. The outer diameter of the stepped portion 4211 is larger than the outer diameter of the pressure rod 421. The second mold base 12 is provided with an inclined stepped through hole 121. The larger hole section of the stepped through hole 121 is located at the end opposite to the first mold base 11. The pressure rod 421 passes through the stepped through hole 121 and extends out of the smaller hole section of the stepped through hole 121 to allow for sliding engagement with the mating through hole 4111 of the drive block 411. The stepped portion 4211 is located in the larger hole section. The injection mold 100 also includes a cover plate 15, which is located at the end of the second mold base 12 opposite to the first mold base 11. The end face of the stepped portion 4211 abuts against the cover plate 15, thereby positioning the pressure rod 421 on the second mold base 12.

[0051] In some embodiments, please refer to Figure 3 To facilitate the use of the pressure rod 421, the radial dimension of the stepped through hole 121 can be slightly larger than the radial dimension of the pressure rod 421, so as to reserve some movement allowance for the pressure rod 421, so that the pressure rod 421 can be smoothly inserted into the mating through hole 4111 of the drive block 411 and slide relative to the drive block 411.

[0052] In some embodiments, please refer to Figure 3 and Figure 5 The second structure 42 also includes a wedge portion 422, and the first structure 41 also includes an inclined surface 412 provided on the drive block 411 that matches the wedge surface of the wedge portion 422. When the first mold base 11 and the second mold base 12 are closed, the drive block 411 and the inclined surface of the wedge portion 422 cooperate to drive the drive block 411 to slide towards the straight cavity section 131, so as to assist in providing sliding power for the drive block 411, so that the drive block 411 can slide more smoothly towards the straight cavity section 131 during the mold closing process.

[0053] In order to make the alignment of the straight mold core 20 and the arc mold core 30 more accurate in the mold closing state, the ends of the straight mold core 20 and the arc mold core 30 that meet can be provided with matching plug-in structures. That is, one end of the straight mold core 20 and the arc mold core 30 is provided with a plug-in protrusion, and the other end is provided with a plug-in groove.

[0054] In some embodiments, please refer to Figure 1 , Figures 4-8 To achieve automatic core pulling of the arc-shaped mold core 30, the injection mold 100 may also include a second drive mechanism 50. The arc-shaped mold core 30 is connected to the second drive mechanism 50. The second drive mechanism 50 drives the arc-shaped mold core 30 to rotate, so that the arc-shaped mold core 30 can move into and out of the arc-shaped cavity segment 132. That is, the second drive mechanism 50 can drive the arc-shaped mold core 30 to rotate forward and backward. The arc-shaped mold core 30 rotates forward to move into the arc-shaped cavity segment 132 and abut against the straight mold core 20. After injection molding is completed, the arc-shaped mold core 30 can rotate backward to separate the arc-shaped mold core 30 from the injection molded product. This helps to reduce the demolding difficulty of the product and improve the surface quality and pass rate of the product.

[0055] This application does not limit the specific design of the second drive mechanism 50. Those skilled in the art, based on their knowledge of the function of the second drive mechanism 50 and the general structure of this application, can adopt any feasible solution from related technologies, such as a geared motor or a linkage mechanism.

[0056] In some embodiments, please refer to Figure 7 and Figure 8 To simplify the structure of the second drive mechanism 50, the second drive mechanism 50 includes a turntable 51 and a power assembly. The turntable 51 is rotatably mounted on the second mold base 12, and the power assembly is driveably connected to the turntable 51 to drive the turntable 51 to rotate. The arc-shaped mold core 30 is connected to the turntable 51, and the arc-shaped mold core 30 and the turntable 51 are concentrically arranged to rotate synchronously relative to the second mold base 12. The power element can also be a geared motor, a linkage mechanism, etc.

[0057] In some embodiments, please refer to Figure 7 and Figure 8 To further simplify the structure of the second drive mechanism 50 and to control costs, the power assembly includes a rack 52 and a power component 53 connected by a transmission. The circumferential side of the turntable 51 is provided with meshing teeth that mesh with the rack 52. The power component 53 drives the rack 52 to move relative to the turntable 51. The power component 53 can be any component capable of driving the rack 52, such as an electric telescopic rod or a hydraulic cylinder; this embodiment is not limited to any particular type.

[0058] In some embodiments, please refer to Figures 3-8 The injection cavity 13 includes a first injection cavity 133 and a second injection cavity 134 corresponding one-to-one with the two insertion tubes 200. Both the first injection cavity 133 and the second injection cavity 134 have a straight cavity section 131 and an arc-shaped cavity section 132. There are two arc-shaped mold cores 30 and two straight mold cores 20. One arc-shaped mold core 30 and one straight mold core 20 form a group and correspond to the straight section 210 and the arc section 220 of one insertion tube 20, respectively. The two straight mold cores 20 are arranged coaxially or their axes are parallel. When the first mold base 11 and the second mold base 12 are closed, the first driving mechanism 40 drives the two straight mold cores 20 to move closer to each other and into the straight cavity section 131 of the first injection cavity 133 and the straight cavity section 131 of the second injection cavity 134, thereby producing two insertion tubes 200 in one injection molding process, which is beneficial to improving the product manufacturing efficiency.

[0059] In some embodiments, to simplify the structure of the injection mold 100 and save costs, please refer to... Figure 7 and Figure 8 The second drive mechanism 50 is connected to both arc-shaped mold cores 30, and the second drive mechanism 50 synchronously drives the two arc-shaped mold cores 30 to rotate.

[0060] Taking a 200mm tracheostomy tube as an example, please refer to [reference needed] for easier understanding. Figure 3 and Figure 6 , Figure 6 The mold body 10 has a first injection cavity 133 and a second injection cavity 134. The second injection cavity 134 is filled with a tracheostomy tube, while the first injection cavity 133 is not filled with a tube 200.

[0061] In some embodiments, please refer to Figure 3After the first mold base 11 and the second mold base 12 are closed, they form a receiving cavity. The mold body 10 also includes a cavity component 14, which is detachably connected to at least one of the first mold base 11 and the second mold base 12. The injection cavity 13 is formed on the cavity component 14. The cavity component 14, the straight mold core 20, and the arc mold core 30 are all disposed within the receiving cavity. The cavity component 14 may include multiple sub-components, which are aligned and connected after mold closing to define the injection cavity 13. The cavity component 14 is detachably disposed on the first mold base 11 / second mold base 12, which facilitates the cleaning of the cavity wall of the injection cavity 13 to remove surface residues, and also facilitates subsequent use and maintenance.

[0062] In some embodiments, at least one of the first mold base 11 and the second mold base 12 is provided with a cooling water channel. The inlet and outlet of the cooling water channel are connected to a mold temperature controller through an external pipeline. The coolant can flow inside the injection mold 100, thereby cooling or controlling the temperature of the injection mold 100, so that the temperature of each part of the injection cavity 13 is uniform, effectively reducing the probability of injection defects such as shrinkage and weld lines caused by uneven mold temperature during the injection process.

[0063] In some embodiments, please refer to Figures 3-5 as well as Figure 8 The first mold base 11 and the second mold base 12 may be provided with cooling water channels inside. The injection mold 100 also includes a cooling pipe 60. The cooling pipe 60 and the first mold base 11 can be integrally formed and the cooling pipe 60 is located inside the first mold base 11. Similarly, the cooling pipe 60 and the second mold base 12 can also be integrally formed and the cooling pipe 60 is located inside the second mold base 12.

[0064] In summary, the injection mold 100 provided by this utility model has at least the following beneficial effects:

[0065] The injection mold 100 utilizes horizontal injection molding technology. The straight mold core 20 and the arc mold core 30 define the size and shape of the inner cavity wall of the insertion tube 200. The arc cavity segment 132 and the arc mold core 30 directly define the shape and size of the arc segment 220 of the insertion tube 200. In the mold-closed state, the straight mold core 20 and the arc mold core 30 are connected to form the corresponding insertion tube 200 in one injection molding process. Compared with the existing technology, there is no need to perform thermoforming on the injection-molded flexible tube, which can avoid thermal deformation. The shape and size of the insertion tube 200 are directly determined by the injection mold 100, which can effectively avoid the technical problems of large length deviation between the inner and outer insertion tubes and difficult assembly.

[0066] During the mold closing process, the first drive mechanism 40 drives the straight mold core 20 to move on the first mold base 11. Utilizing the high precision characteristics of the mold, the straight mold core 20 can accurately reach the straight cavity section 131 and connect with the arc mold core 30 located in the arc cavity section 132. This improves the dimensional accuracy of the final product and helps increase the product's yield rate. Therefore, it balances the improvement of the quality of a single insert 200 product and the improvement of the fitting accuracy between the inner and outer inserts.

[0067] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An injection mold, characterized in that, The injection mold is used to prepare a cannula, which includes a straight section and an arc section connected to each other; the injection mold includes a mold body, a straight mold core, an arc mold core and a first drive mechanism. The mold body includes a first mold base and a second mold base. After the first mold base and the second mold base are closed, an injection cavity matching the shape of the insertion tube to be prepared is formed in the mold body. The injection cavity includes a straight cavity segment corresponding to the straight segment and an arc cavity segment corresponding to the arc segment. The straight mold core is disposed on the first mold base, and the arc-shaped mold core is disposed on the first mold base or the second mold base; The first driving mechanism includes a first structure and a second structure, wherein the first structure is movably disposed on the first mold base, and the second structure is disposed on the second mold base; Wherein: the straight mold core is connected to the first structure, the first structure and the second structure are aligned and fitted during mold closing, the second structure drives the first structure to move the straight mold core into the straight cavity section, and after the first mold base and the second mold base are closed, the straight mold core is connected to the arc mold core located in the arc cavity section.

2. The injection mold as described in claim 1, characterized in that, The first structure and the second structure are aligned and fitted during mold opening. The second structure can drive the first structure to reset, so that the straight mold core can be moved out of the straight cavity section along the axial direction of the straight mold core.

3. The injection mold as described in claim 2, characterized in that, The first structure includes a driving block, and the straight mold core is connected to the driving block. The second structure includes a pressure rod inclinedly disposed on the second mold base. The driving block is slidably disposed on the first mold base along the axial direction of the straight mold core. The driving block has an inclined mating through hole corresponding to the pressure rod. When the mold is closed, the pressure rod extends into the mating through hole and drives the driving block to move closer to the straight cavity section; when the mold is opened, the pressure rod moves away from the mating through hole and drives the driving block away from the straight cavity section.

4. The injection mold as described in claim 3, characterized in that, The second structure further includes a wedge portion, and the first structure further includes an inclined surface on the drive block that matches the wedge surface of the wedge portion. When the first mold base and the second mold base are closed, the drive block and the inclined surface of the wedge portion cooperate to drive the drive block to slide towards the straight cavity section.

5. The injection mold as described in claim 1, characterized in that, The injection mold further includes a second driving mechanism, and the arc-shaped mold core is drivenly connected to the second driving mechanism. The second driving mechanism drives the arc-shaped mold core to rotate so that the arc-shaped mold core can move into and out of the arc-shaped cavity.

6. The injection mold as described in claim 5, characterized in that, The second driving mechanism includes a turntable and a power component. The turntable is rotatably mounted on the second mold base, and the power component is drively connected to the turntable. The power component is used to drive the turntable to rotate. The arc-shaped mold core is connected to the turntable, and the arc-shaped mold core and the turntable are concentrically arranged to rotate synchronously.

7. The injection mold as described in claim 6, characterized in that, The power assembly includes a rack and a power component that are connected by transmission. The circumferential side of the turntable is provided with meshing teeth that mesh with the rack. The power component drives the rack to move relative to the turntable.

8. The injection mold as described in any one of claims 1-7, characterized in that, The injection cavity includes a first injection cavity and a second injection cavity corresponding to the two cannulas one by one. Both the first injection cavity and the second injection cavity have the straight cavity segment and the arc-shaped cavity segment. There are two of each of the arc-shaped mold cores and the straight mold cores. One arc-shaped mold core and one straight mold core form a group and correspond to the straight segment and arc segment of one of the insertion tubes, respectively. The two straight mold cores are arranged coaxially or the axes of the two straight mold cores are parallel. When the first mold base and the second mold base are closed, the first driving mechanism drives the two straight mold cores to move closer to each other and into the straight cavity section of the first injection cavity and the straight cavity section of the second injection cavity, respectively.

9. The injection mold as described in any one of claims 1-7, characterized in that, After the first mold base and the second mold base are closed, they form a receiving cavity. The mold body also includes a cavity component, which is detachably connected to at least one of the first mold base and the second mold base. The injection cavity is formed on the cavity component. The cavity component, the straight mold core, and the arc mold core are all disposed in the receiving cavity.

10. The injection mold according to any one of claims 1-7, characterized in that, At least one of the first mold base and the second mold base has a cooling water channel inside.

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