A medical endoscope handle injection mold structure with quick mold change capability

Abstract

This utility model relates to an injection mold, specifically, to a medical endoscope handle injection mold structure capable of rapid mold changing. It includes a mold body. In this utility model, when the rotating threaded rod drives two sliders closer together, the ends of the sliders push the corresponding moving wedge block to overcome the spring force of the return spring until its inclined surface is in close contact with the inclined surface of the fixed wedge block. Through the wedge-tightening action, the mold core is firmly locked and installed in the inner groove. During this process, the return spring is compressed and stores energy. When the threaded rod is rotated in the opposite direction, driving the two sliders away from each other, the return spring immediately releases the stored energy, causing the end of the moving wedge block to completely retract from the side groove into the assembly groove. At this point, the moving wedge block and the fixed wedge block disengage. By removing the original mold core and replacing it with a mold core of the same specifications but with a different molding cavity shape, the mold can be quickly switched for injection molding production of different models of endoscope handles, improving production flexibility and mold changing efficiency.

Description

Technical Field

[0001] This utility model relates to an injection mold, specifically, to an injection mold structure for a medical endoscope handle that allows for rapid mold changing. Background Technology

[0002] When injection molding medical endoscope handles, when switching to the next model after completing the production of one product model, the original mold structure usually requires disassembling the entire mold from the injection molding machine and then reinstalling the mold of the required model for production. Since such molds are usually composed of a mold body (mold frame) and a molding core, and the key molding cavity is directly opened on the molding core, theoretically, only the molding core of the same specification but with a different molding cavity shape needs to be replaced to achieve quick model changeover.

[0003] The utility model with authorization announcement number CN109397622B provides a quick mold change structure for injection molds. It adopts a universal mold structure, with both the moving mold frame and the fixed mold frame designed as C-shaped structures with one side opening. The moving mold core and the fixed mold core are assembled from the side openings of the corresponding mold frames. A clamping block is set at the opening to clamp the moving mold core and the fixed mold core from the side. When it is necessary to replace the moving mold core, simply remove the clamping block and the moving mold core can be horizontally pulled out from the side opening of the moving mold frame, which theoretically simplifies the mold core replacement process.

[0004] However, the aforementioned patented solutions have a key limitation in practical applications. The molding cavity area of ​​the moving mold core usually has ejection slots for ejecting the product. When the mold is closed, the ejector pins in the ejection mechanism are precisely inserted into these ejection slots. When the moving mold core needs to be pulled out in a direction perpendicular to the ejector pin axis, these ejector pins extending into the ejection slots will inevitably form a physical obstruction. In order to move the moving mold core, the ejector pins must be completely withdrawn from the ejection slots. However, in the prior art, in order to pursue a compact structure and save installation space, the design of the ejection mechanism often does not have the function of convenient, large-range repositioning or quick removal of the ejector pins. If the ejector pins are forcibly withdrawn, it usually means that the entire ejection mechanism needs to be disassembled or complex adjustments need to be made. This process is time-consuming and laborious, which seriously offsets the efficiency advantage brought by quick mold core replacement, and ultimately still requires a lot of production time. Utility Model Content

[0005] The purpose of this invention is to provide a medical endoscope handle injection mold structure that allows for rapid mold changing, in order to solve the problems mentioned in the background art. When it is necessary to pull the moving mold core away in a direction perpendicular to the ejector pin axis, the ejector pin extending into the ejector slot will inevitably form a physical obstruction.

[0006] To address the above problems, the present invention aims to provide a medical endoscope handle injection mold structure capable of rapid mold changing, comprising a mold body, an inset groove on one side of the mold body, a mold core embedded inside the inset groove, fixed wedges fixedly connected to one end of the mold core at the bottom of the inset groove on both sides, side grooves on the inner wall of the inset groove corresponding to the two fixed wedges, the fixed wedges slidably disposed inside the corresponding side grooves, an assembly groove on the outer wall of the mold body corresponding to each inset groove, the assembly groove communicating with the corresponding side groove, a movable wedge horizontally slidably disposed inside the assembly groove, and a driving mechanism on the mold body for driving the two movable wedges to approach each other, when the driving mechanism drives the two movable wedges to approach each other, the two movable wedges extending into the two side grooves respectively and contacting the corresponding fixed wedges, and the side of the movable wedges and fixed wedges in contact is set as an inclined surface.

[0007] As a further improvement to this technical solution, the driving mechanism includes a threaded rod that rotates horizontally through the mold body. A sealing plate is fixedly installed on the outer wall of the mold body at the position corresponding to the two assembly slots. The sealing plate is rotatably connected to the threaded rod. Both ends of the threaded rod rotate through the sealing plate and are coaxially fixedly connected with bolt heads.

[0008] As a further improvement to this technical solution, the driving mechanism also includes a slider that is horizontally slidably disposed inside the assembly groove. The slider is threadedly connected to the threaded rod, and the two sliders have opposite thread directions to the threaded rod. The end of the slider contacts the side of the moving wedge block away from the mold core.

[0009] As a further improvement to this technical solution, the driving mechanism also includes a mounting bracket fixedly connected to the side of the sealing plate near the mold core. The moving wedge block is horizontally fixedly connected to both ends near the two ends on the side away from the mold core. The other end of the sliding rod slides through the mounting bracket and is fixedly connected to an end cap.

[0010] As a further improvement to this technical solution, a return spring is provided between the end cap and the mounting bracket, which is slidably sleeved on the slide rod. The return spring pushes the end cap away from the mold core.

[0011] As a further improvement to this technical solution, the end of the moving wedge is located between the two sliding rods, and a through groove is provided at the position of the mounting bracket corresponding to the moving wedge. When the threaded rod drives the moving wedge away from the mold core, the end of the moving wedge passes through the inside of the through groove.

[0012] As a further improvement to this technical solution, when the moving wedge block contacts the fixed wedge block, the side of the fixed wedge block away from the moving wedge block contacts the inner wall of the inner groove, the side of the fixed wedge block inclined surface closer to the mold core is the high side, and the side of the fixed wedge block inclined surface away from the mold core is the low side.

[0013] As a further improvement to this technical solution, there is a gap between the threaded rod and the mold core on the side located deep in the inner groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This medical endoscope handle injection mold structure with rapid mold changing capability features a mechanism where rotating the threaded rod causes two sliders to approach each other. The ends of the sliders push the corresponding moving wedge block to overcome the spring force of the return spring, allowing the end of the moving wedge block to enter the side groove from the assembly groove until its inclined surface is in close contact with the inclined surface of the fixed wedge block. This wedge action securely locks the mold core into the inner groove. During this process, the return spring is compressed and stores energy. When the threaded rod is rotated in the opposite direction, causing the two sliders to move away from each other, the return spring releases the stored energy, pushing the corresponding end cap away from the mold core. The end cap, through a sliding rod, drives the moving wedge block to move synchronously, causing the end of the moving wedge block to completely retract from the side groove into the assembly groove. At this point, the moving wedge block disengages from the fixed wedge block, releasing the mold core. The mold core can then be easily removed from the inner groove along the ejector pin axis. By removing the original mold core and replacing it with a mold core of the same specifications but with different molding cavity shapes, the mold can be quickly switched for injection molding production of different models of endoscope handles, improving production flexibility and mold changing efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall device and ejection mechanism of this utility model after assembly; Figure 2 This is a schematic diagram of the overall device of this utility model; Figure 3 This is a cross-sectional view of the overall device of this utility model; Figure 4 This is a schematic diagram of the mold core structure of this utility model; Figure 5 This is a schematic diagram of the drive mechanism and the moving wedge block of this utility model; Figure 6 This is a partial structural diagram of the drive mechanism and moving wedge block of this utility model.

[0016] The meanings of the labels in the diagram are as follows: 1. Mold body; 11. Inner groove; 12. Side groove; 13. Assembly groove; 2. Mold core; 21. Fixed wedge block; 3. Moving wedge; 4. Drive mechanism; 41. Threaded rod; 42. Slider; 43. Sealing plate; 44. Mounting bracket; 45. Slide rod; 46. End cap; 47. Return spring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example 1 Please see Figure 1 and Figure 2 As shown, the purpose of this embodiment is to provide a medical endoscope handle injection mold structure that can be quickly molded, including a mold body 1, an inset groove 11 is provided on one side of the mold body 1, a mold core 2 is embedded inside the inset groove 11, the side of the mold core 2 with molding function is exposed outside the inset groove 11, and a number of molding cavities that precisely match the shape of the medical endoscope handle are provided on the exposed side of the mold core 2.

[0019] To achieve efficient demolding, refer to Figure 4 The mold body 1 and the mold core 2 have several sets of interconnected circular holes. Two circular holes in each set together form an ejector hole. One end of these ejector holes extends into the interior of the molding cavity, and the other end extends into the side of the mold body 1 away from the inner groove 11. An ejection mechanism is assembled on the side of the mold body 1 away from the inner groove 11. This mechanism includes several slidable ejector rods, which are respectively set in the corresponding ejector holes. During the injection molding process, when the molten plastic is injected into the molding cavity, the top of the ejector rod retracts into the circular hole of the mold core 2 to avoid interfering with the product molding. After the plastic cools and solidifies to form the medical endoscope handle, the ejection mechanism drives all the ejector rods to eject synchronously, smoothly pushing the molded part out of the molding cavity of the mold core 2, thereby efficiently completing the demolding process. The ejection mechanism is a common technology in the mold field, and its specific working principle will not be elaborated here.

[0020] To ensure that the mold core 2 is firmly fixed in the inner groove 11 under the huge thrust of the ejection action, and to prevent it from being pushed and displaced by the ejector pin, refer to Figure 3 Fixed wedges 21 are fixedly connected to one end of the inner groove 11 on both sides of the mold core 2. Side grooves 12 are opened at the positions corresponding to the two fixed wedges 21 on the inner wall of the inner groove 11. One end of the side groove 12 extends to the side of the mold body 1 away from the ejection mechanism. The fixed wedges 21 are slidably disposed inside the corresponding side grooves 12. Assembly grooves 13 are opened at the positions corresponding to each inner groove 11 on the outer wall of the mold body 1. The assembly grooves 13 are connected to the corresponding side grooves 12. Moving wedges 3 are horizontally slidably disposed inside the assembly grooves 13. A drive mechanism 4 is provided on the mold body 1 to drive the two moving wedges 3 to approach each other.

[0021] When the drive mechanism 4 drives the two moving wedges 3 to approach each other, the ends of the two moving wedges 3 that approach each other extend into the two side grooves 12 respectively and contact the corresponding fixed wedges 21. The sides of the moving wedges 3 and the fixed wedges 21 that are in contact are both set as inclined surfaces. Specifically, the side of the inclined surface of the fixed wedge 21 that is closer to the mold core 2 is the high side, and the side that is farther away from the mold core 2 is the low side. Through the cooperation of the inclined surfaces of the moving wedges 3 and the fixed wedges 21, the moving wedges 3 that approach each other apply a force to the fixed wedges 21. This force can be decomposed into components that are perpendicular to and parallel to the demolding direction (or the ejector direction) of the mold core 2. The vertical component generates a strong wedge locking force, which firmly presses and fixes the mold core 2 to the inner wall of the inner groove 11, thereby effectively resisting the thrust of the mold core 2 when the ejector rod ejects the medical endoscope handle, and ensuring that the position of the mold core 2 is stable.

[0022] The structure of drive mechanism 4 is described in detail below, referring to... Figure 5 and Figure 6 The drive mechanism 4 includes a threaded rod 41 that rotates horizontally through the mold body 1. There is a gap between the threaded rod 41 and the mold core 2 on one side of the bottom of the inner groove 11. This gap is used to ensure that the wall of the inner groove 11 has sufficient strength to support the mold core 2. A sealing plate 43 is fixedly installed on the outer wall of the mold body 1 at the corresponding positions of the two assembly grooves 13. The sealing plate 43 is rotatably connected to the threaded rod 41. Both ends of the threaded rod 41 rotate through the sealing plate 43 and are coaxially fixedly connected with bolt heads, which makes it convenient for the operator to rotate the threaded rod 41 with a hand tool.

[0023] The drive mechanism 4 also includes a mounting bracket 44 fixedly connected to the sealing plate 43 on the side near the mold core 2. The moving wedge 3 is horizontally fixedly connected to both ends on the side away from the mold core 2. The other end of the sliding rod 45 slides through the mounting bracket 44 and is fixedly connected to an end cap 46. The sliding rod 45 and the mounting bracket 44 cooperate to constrain the moving wedge 3 to move only horizontally. A return spring 47 is provided between the end cap 46 and the mounting bracket 44 and is slidably sleeved on the sliding rod 45. The return spring 47 pushes the end cap 46 away from the mold core 2.

[0024] The drive mechanism 4 also includes a slider 42 that is horizontally slidably disposed inside the assembly groove 13. The slider 42 is threadedly connected to the threaded rod 41, and the threads of the two sliders 42 and the threaded rod 41 are opposite in direction. The end of the slider 42 contacts the side of the moving wedge block 3 away from the mold core 2. The slider 42 is located between the two sliding rods 45. The mounting bracket 44 has a through groove at the position corresponding to the moving wedge block 3 so that when the threaded rod 41 drives the slider 42 away from the mold core 2, the end of the slider 42 can pass smoothly through the inside of the through groove.

[0025] When installing the mold core 2, first embed the mold core 2 into the inner groove 11, so that the two fixed wedges 21 are inserted into the corresponding two side grooves 12 respectively. At this time, under the action of the return spring 47, the moving wedge 3 is completely located inside the assembly groove 13, so as to avoid obstructing the insertion of the fixed wedge 21. Then, rotate the threaded rod 41 to drive the two sliders 42 to move closer to each other. The end of the slider 42 pushes the corresponding moving wedge 3 to move towards the fixed wedge 21 against the elastic force of the return spring 47. This allows the moving wedge 3 to enter the side groove 12 from the assembly groove 13 with one end facing the fixed wedge 21. The moving wedge 3 continues to move until its inclined surface is in close contact with the inclined surface of the fixed wedge 21. Through the wedge action, the mold core 2 is firmly locked and installed in the inner groove 11. During this process, the moving wedge 3 drives the end cap 46 to move synchronously through the slide rod 45. The end cap 46 (and the moving wedge 3) move closer to the mold core 2, and the distance between them shortens. The return spring 47 is compressed and stores energy.

[0026] When disassembling the mold core 2, the threaded rod 41 is rotated in the opposite direction, causing the two sliders 42 to move away from each other. The return spring 47 then releases the stored energy, pushing the corresponding end cap 46 away from the mold core 2. The end cap 46 drives the moving wedge block 3 to move synchronously through the slide rod 45, so that the end of the moving wedge block 3 is completely retracted from the side groove 12 into the assembly groove 13. At this time, the moving wedge block 3 is disengaged from the fixed wedge block 21, releasing the lock on the mold core 2. The mold core 2 can then be smoothly removed from the inner groove 11 along the direction of the ejector rod axis.

[0027] By removing the original mold core 2 and installing a mold core 2 with different molding cavity shapes but the same specifications, the mold can be quickly switched for injection molding production of different models of endoscope handles, improving production flexibility and efficiency.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A medical endoscope handle injection mold structure with rapid mold changing capability, comprising a mold body (1), characterized in that: An inset groove (11) is provided on one side of the mold body (1), and a mold core (2) is embedded inside the inset groove (11). A fixed wedge block (21) is fixedly connected to one end of the mold core (2) at the bottom of the inset groove (11). A side groove (12) is provided on the inner wall of the inset groove (11) at the position corresponding to the two fixed wedge blocks (21). The fixed wedge blocks (21) are slidably disposed inside the corresponding side groove (12). An assembly groove (13) is provided on the outer wall of the mold body (1) at the position corresponding to each inset groove (11). The assembly groove (13) is connected to the corresponding side groove (12). A moving wedge (3) is horizontally slidably arranged inside the assembly groove (13). A driving mechanism (4) is provided on the mold body (1) for driving the two moving wedges (3) to approach each other. When the driving mechanism (4) drives the two moving wedges (3) to approach each other, the two moving wedges (3) extend into the two side grooves (12) respectively and contact the corresponding fixed wedge (21). The side of the moving wedge (3) and the fixed wedge (21) that are in contact are both set as inclined surfaces.

2. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 1, characterized in that: The driving mechanism (4) includes a threaded rod (41) that rotates horizontally through the mold body (1). A sealing plate (43) is fixedly installed on the outer wall of the mold body (1) at the position corresponding to the two assembly slots (13). The sealing plate (43) is rotatably connected to the threaded rod (41). Both ends of the threaded rod (41) rotate through the sealing plate (43) and are coaxially fixedly connected with bolt heads.

3. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 2, characterized in that: The drive mechanism (4) also includes a slider (42) that is horizontally slidably disposed inside the assembly groove (13). The slider (42) is threadedly connected to the threaded rod (41), and the two sliders (42) and the threaded rod (41) have opposite thread directions. The end of the slider (42) contacts the side of the moving wedge block (3) away from the mold core (2).

4. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 2, characterized in that: The drive mechanism (4) also includes a mounting bracket (44) fixedly connected to the sealing plate (43) on the side near the mold core (2). The moving wedge (3) is horizontally fixedly connected to both ends on the side away from the mold core (2). The other end of the sliding rod (45) slides through the mounting bracket (44) and is fixedly connected to an end cap (46).

5. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 4, characterized in that: A return spring (47) is provided between the end cap (46) and the mounting bracket (44) and is slidably sleeved on the slide rod (45). The return spring (47) pushes the end cap (46) away from the mold core (2).

6. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 4, characterized in that: The end of the moving wedge (3) is located between the two slide bars (45). The mounting bracket (44) has a through groove at the position corresponding to the moving wedge (3). When the threaded rod (41) drives the moving wedge (3) away from the mold core (2), the end of the moving wedge (3) passes through the inside of the through groove.

7. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 1, characterized in that: When the moving wedge (3) contacts the fixed wedge (21), the side of the fixed wedge (21) away from the moving wedge (3) contacts the inner wall of the inner groove (11). The side of the inclined surface of the fixed wedge (21) closer to the mold core (2) is the high side, and the side of the inclined surface of the fixed wedge (21) away from the mold core (2) is the low side.

8. The injection mold structure for a medical endoscope handle capable of rapid mold changing according to claim 2, characterized in that: There is a gap between the threaded rod (41) and the mold core (2) on one side deep in the inner groove (11).

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