Sprue bush for injection mold

Abstract

The utility model discloses a sprue bush for an injection mold. The sprue bush comprises a sprue flange, a positioning sleeve, a pressing sleeve and a fastening jacket, a sprue channel is formed in the surface of the sprue flange and used for guiding molten plastic to enter a mold cavity. The positioning sleeve is fixedly installed on the surface of the sprue flange, and threads matched with the pressing sleeve are arranged on the surface of the positioning sleeve. Through threaded screwing of the pressing sleeve, the pushing effect on the fastening clamping sleeve is achieved, the fastening clamping sleeve is promoted to deform and be tightly connected with a port of an injection molding machine, and a stable sealing structure is formed. In addition, a cooling runner is arranged in the sprue flange, temperature control can be achieved through external refrigeration equipment, the sprue part is prevented from being overheated, and the quality of a formed part is improved. The injection mold is reasonable in structural design, has the advantages of quick assembly and disassembly, reliable sealing, efficient cooling and the like, remarkably improves the maintenance efficiency and the forming quality of the mold, and is suitable for production and application of various injection molds.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to a sprue sleeve for injection molds. Background Technology

[0002] In existing injection molding technology, the sprue bushing, as a crucial channel for molten plastic to enter the mold cavity, typically requires a reliable connection to the injection molding machine port to ensure smooth and stable flow of the molten material. Traditional sprue bushing structures usually employ simple straight-insertion or threaded fixing connections. The main body is mechanically fixed to the mold during assembly, making the disassembly and assembly process cumbersome and prone to inaccurate positioning. Furthermore, to ensure the sealing and stability of the connection, traditional solutions often require multiple adjustments during assembly, resulting in low work efficiency and high maintenance costs.

[0003] Traditional sprue bushing clamping structures also have certain drawbacks, relying mainly on single-face pressure or fasteners for fixation. During injection molding, due to the continuous action of high-temperature, high-pressure molten plastic, traditional sprue bushings are prone to loosening and poor sealing, leading to molten material leakage and affecting product molding quality. Furthermore, due to insufficient tightness, disassembling or replacing the sprue bushing is difficult, increasing mold maintenance cycles and operational complexity.

[0004] In view of this, we have studied and improved the existing problems to provide a sprue bushing for injection molds, which aims to solve the current problems and improve the practical value through this technology. Utility Model Content

[0005] The present invention aims to solve the technical problems existing in the prior art or related technologies.

[0006] A sprue bushing for an injection mold includes: a sprue flange, a positioning sleeve, a clamping sleeve, and a locking sleeve. The sprue flange has a sprue channel on its surface and is connected to an inlet end sleeve. The positioning sleeve is fixedly installed on the surface of the sprue flange, and its surface has threads adapted to the clamping sleeve. The locking sleeve is movably sleeved inside the positioning sleeve. The surface of the clamping sleeve has an operating lever for driving the clamping sleeve to tighten, causing the locking sleeve to deform and achieve a tight connection with the injection molding machine port. The surface of the locking sleeve has several deformation gaps. The outer surface of the locking sleeve also has a pressing surface and a wedge surface. The inner side of the positioning sleeve has an expanding inclined surface that abuts against the pressing surface, and the inner side of the clamping sleeve has a pressing wedge surface that abuts against the wedge surface.

[0007] In a preferred embodiment, this utility model can be further configured as follows:

[0008] According to the aforementioned retaining sleeve: the number of deformation gaps is two sets, and they are distributed alternately on the upper and lower surfaces of the retaining sleeve. The inner side of the retaining sleeve is provided with a sleeve hole for connecting with the injection molding machine port.

[0009] Both the expansion ramp and the wedge are oblique conical in shape, and the vertical length of the expansion ramp is greater than the vertical length of the wedge to optimize the distribution of clamping force.

[0010] According to the gate flange: the gate channel has a cylindrical or tapered structure, penetrates the surface of the gate flange, and is used to guide molten plastic into the mold cavity.

[0011] According to the cooling channel: located inside the gate flange, the cooling channel has a spiral structure, and the surface of the gate flange is provided with a pipe port that communicates with the cooling channel. The pipe port is used to connect to external refrigeration equipment to realize temperature control of molten plastic.

[0012] According to the inlet end sleeve: the top surface is provided with a sealing gasket layer that abuts against the injection mold port to improve the sealing performance of the connection with the injection molding machine port.

[0013] The beneficial effects achieved by this utility model are as follows:

[0014] 1. In this utility model, the pushing action of the locating sleeve is achieved by tightening the threads of the positioning sleeve and the clamping sleeve, and the tight connection with the injection molding machine port is achieved by the deformation of the locating sleeve. The quick disassembly and installation achieve the connection effect with the injection molding machine. Furthermore, the threaded connection structure of the positioning sleeve and the clamping sleeve makes the installation and disassembly of the sprue sleeve more convenient, thereby improving the maintenance efficiency of the mold.

[0015] 2. In this utility model, the expansion bevel on the positioning sleeve abuts against the pressing surface of the clamping sleeve to form an effective clamping structure. At the same time, the force of the wedge surface ensures the stability and sealing effect of the sprue sleeve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the gating flange according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the gating flange according to an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the positioning sleeve and the clamping sleeve according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of a locking sleeve structure according to an embodiment of the present invention.

[0021] Figure label:

[0022] 100. Sprue flange; 110. Sprue channel; 120. Inlet end sleeve; 121. Cooling channel; 200. Positioning sleeve; 201. Expanding bevel; 300. Compactor sleeve; 310. Operating lever; 301. Wedge face; 400. Settling sleeve; 410. Deformation gap; 401. Pressing surface; 402. Wedge face. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0024] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0025] The following is in conjunction with the appendix Figures 1-5 This invention describes a sprue bushing for an injection mold, provided by some embodiments of the present invention.

[0026] This utility model provides a sprue bushing for injection molds, including: a sprue flange 100, a positioning sleeve 200, a clamping sleeve 300, and a locking clip 400.

[0027] Sprue flange 100: The surface of the sprue flange 100 is provided with a sprue channel 110, which is cylindrical or tapered, for guiding molten plastic into the mold cavity. The sprue flange 100 also has a cooling channel 121 inside, which is spiral in shape and has a port on its surface that communicates with the cooling channel. This port can be connected to external refrigeration equipment to control the temperature of the molten plastic, prevent overheating at the sprue, and improve product molding quality.

[0028] Positioning sleeve 200: The positioning sleeve 200 is fixedly installed on the surface of the gate flange 100. The inner side of the positioning sleeve 200 is provided with an expansion bevel 201, the vertical length of which is greater than the wedge surface 402 on the clamping sleeve 400, which is beneficial for distributing clamping force and improving stability. The outer surface of the positioning sleeve 200 is provided with threads that are compatible with the clamping sleeve 300, which facilitates threaded tightening and fixing.

[0029] Compression sleeve 300: The inner side of the compression sleeve 300 is provided with a wedge surface 301, which abuts against the inclined wedge surface 402 of the locking sleeve 400. An operating rod 310 is provided on the outer surface of the compression sleeve 300. By rotating the compression sleeve 300 through the operating rod 310, a pushing action is achieved on the locking sleeve 400, causing it to deform and tightly connect with the injection molding machine port.

[0030] The locking sleeve 400 is movably fitted inside the positioning sleeve 200. Its surface is provided with several deformation gaps 410, in two sets, which are staggered on the upper and lower surfaces of the locking sleeve 400 to facilitate uniform stress distribution during deformation. The outer surface of the locking sleeve 400 is provided with a pressing surface 401 and a wedge surface 402. The pressing surface 401 abuts against the expansion inclined surface 201 of the positioning sleeve 200, and the wedge surface 402 cooperates with the pressing wedge surface 301 of the clamping sleeve 300.

[0031] Working principle:

[0032] During installation, the clamping sleeve 300 is rotated via the operating lever 310, gradually tightening along the threads of the positioning sleeve 200 and causing the locking sleeve 400 to deform. During deformation, the deformation gap 410 of the locking sleeve 400 ensures a tight connection between its outer surface and the injection molding machine port, creating a stable seal. The expansion bevel 201 on the positioning sleeve 200 cooperates with the pressing surface 401 of the locking sleeve 400, providing effective clamping and ensuring the stability and sealing of the sprue sleeve. The cooling channel 121 uses external cooling equipment to control the temperature of the molten plastic, accelerating the cooling of the sprue area, shortening the molding cycle, and preventing overheating at the sprue from affecting product quality.

[0033] Furthermore, such as Figure 5 As shown, the structure of the locking sleeve 400 is further optimized:

[0034] Deformation gap 410: Distributed at the upper and lower ends of the locking sleeve 400, in an interlaced structure, effectively reducing stress concentration during deformation and ensuring uniform and stable deformation.

[0035] Inner sleeve hole: The inner side of the locking sleeve 400 is provided with a sleeve hole for connecting with the injection molding machine port, ensuring a reliable connection with the injection molding machine port and improving the stability of the melt flow.

[0036] Work process:

[0037] By using the sleeve structure between the locking sleeve 400 and the injection molding machine port, combined with the uniform distribution of the deformation gap 410, the locking sleeve is subjected to uniform force after deformation, maintaining a stable connection and improving the safety and sealing of the injection molding process.

[0038] Furthermore, such as Figure 3 As shown, the cooling channel 121 and the inlet end sleeve 120 have been further optimized:

[0039] Inlet sleeve 120: Located on top of the gate flange 100, its top surface is provided with a sealing gasket. This gasket abuts against the injection mold port, effectively improving the sealing effect at the connection and preventing molten material leakage.

[0040] Cooling channel 121: The spiral structure inside the gating flange 100 enables temperature control of the molten plastic. At the same time, by connecting to the pipe of the external refrigeration equipment, it effectively accelerates the cooling process, shortens the molding cycle, and improves production efficiency.

[0041] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sprue bushing for an injection mold, characterized in that, include: The instrument comprises a gating flange (100), a positioning sleeve (200), a clamping sleeve (300), and a locking sleeve (400). The gating flange (100) has a gating channel (110) on its surface and is connected to an inlet end sleeve (120). The positioning sleeve (200) is fixedly installed on the surface of the gating flange (100), and the surface of the positioning sleeve (200) has threads that are compatible with the clamping sleeve (300). The locking sleeve (400) is movably sleeved inside the positioning sleeve (200). The surface of the clamping sleeve (300) is provided with an operating rod (310). The surface of the locking sleeve (400) is provided with several deformation gaps (410). The surface of the locking sleeve (400) is provided with a pressing surface (401). The inner side of the clamping sleeve (300) and the inner side of the positioning sleeve (200) are respectively provided with a wedge surface (301) that abuts against the pressing surface (401) and an expansion wedge surface (201) that abuts against the wedge surface (402).

2. The sprue bushing for an injection mold according to claim 1, characterized in that, The deformation gaps (410) are in two sets and are distributed alternately on the upper and lower surfaces of the retaining sleeve (400). The retaining sleeve (400) has a sleeve hole on the inner side that is fitted with the injection molding machine port.

3. The sprue bushing for an injection mold according to claim 1, characterized in that, Both the expansion inclined surface (201) and the pressure wedge surface (301) are oblique conical, and the vertical length of the expansion inclined surface (201) is greater than the vertical length of the oblique wedge surface (402).

4. A sprue bushing for an injection mold according to claim 1, characterized in that, The gating channel (110) has a cylindrical or tapered structure and penetrates the surface of the gating flange (100).

5. A sprue bushing for an injection mold according to claim 1, characterized in that, The top surface of the inlet end sleeve (120) is provided with a sealing gasket layer that abuts against the injection mold port, which is used to improve the sealing performance of the inlet end sleeve (120) and the injection mold port.

6. A sprue bushing for an injection mold according to claim 1, characterized in that, The inner side of the inlet end sleeve (120) is provided with a spiral cooling channel (121), and the surface of the gating flange (100) is provided with a pipe opening that communicates with the cooling channel (121). The pipe opening is used to connect to external refrigeration equipment.

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