Face contact wear resistant screw head assembly

Abstract

The utility model relates to a kind of face contact wear-resistant screw head groups, including overgluing head, screw head, check ring and meson, the screw head includes overgluing portion, guide portion and rear connecting portion in order from front to back, wherein, the overgluing head is coaxially fixed in the front end of the screw head, the meson is fixedly installed on the guide portion, the check ring is sleeved in the outside of the overgluing portion, and the front and rear ends of the check ring are respectively limited to move by the tail end of overgluing head and the front end of meson;The middle part of the overgluing head is uniformly provided with multiple front and rear through fluid channels.The utility model is provided with fluid channel inside overgluing head, the contact surface of overgluing portion tail end and check ring is greatly increased, compared with the practice of existing tungsten carbide alloy welding, with better wear resistance, and low cost, production is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, specifically to a surface contact wear-resistant screw head assembly. Background Technology

[0002] The screw head assembly is a crucial component of an injection molding machine, comprising three parts: the screw head, the guide plate, and the check ring. Existing screw heads, from front to rear, sequentially include a flow guide section, a glue passage section, a guide section, and a connecting section. The guide plate is fixedly mounted on the guide section, and the check ring is movably fitted onto the outside of the glue passage section. The front and rear ends of the check ring are respectively confined by the flow guide section and the guide plate. The screw head is fixed to the screw via the connecting section. Multiple axially distributed flow guide grooves 5 are formed on the outer surface of the flow guide section, specifically as follows... Figure 1 , Figure 2 As shown. After the fluid material flows out from the space between the check ring and the glue passage, it enters the guide channel 5 and continues to flow forward.

[0003] In practical applications, as the material flows forward, it pushes the check ring against the tail end face of the guide channel, causing friction and severe wear on the tail end face of the guide channel, resulting in material leakage, especially... Figure 2 The wear is particularly severe in areas B of the four regions. Therefore, the current practice is to replace the material of area B with a wear-resistant tungsten carbide alloy, which is then welded onto the location of area B. However, this approach is costly and involves a complex manufacturing process.

[0004] Therefore, there is a need in this field for a screw head assembly that has good wear resistance, lower cost, and is easier to manufacture. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a surface contact wear-resistant screw head assembly.

[0006] To achieve the purpose of this utility model, this application provides the following technical solution.

[0007] In a first aspect, this application provides a surface-contact wear-resistant screw head assembly. The screw head assembly includes a glue-passing head, a screw head, a check ring, and a separator. The screw head, from front to back, includes a glue-passing section, a guide section, and a rear connecting section. The glue-passing head is coaxially fixed to the front end of the screw head. The separator is fixedly mounted on the guide section. The check ring is sleeved on the outside of the glue-passing section, and its front and rear ends are restricted from movement by the tail end of the glue-passing head and the front end of the separator, respectively. Multiple through-flow fluid channels are uniformly provided in the middle of the glue-passing head. In this application, the fluid channels on the glue-passing head are changed from the original outer guide groove to an internal fluid channel, thereby greatly increasing the contact area between the tail end of the glue-passing head and the check ring. Compared with the existing method of welding tungsten carbide alloy, this method offers better wear resistance, lower cost, and easier production.

[0008] In one embodiment of the first aspect, the number of fluid channels is 2 to 100. The number of fluid channels and the diameter of each fluid channel need to be determined according to the flow rate of the material. The fluid channels are parallel to the axial direction of the glue-passing head, or the fluid channels are arranged obliquely, i.e., not parallel to the axial direction of the glue-passing head.

[0009] In one embodiment of the first aspect, the outer edge of the tail end face of the glue applicator is less than or equal to the outer edge of the front end face of the check ring. This arrangement ensures that all materials can flow forward through the fluid channel without leaking in other directions; it also maximizes the contact area between the glue applicator and the check ring, reducing wear.

[0010] In one embodiment of the first aspect, the glue-passing head is detachably mounted on the front end of the screw head. The front end of the screw head has a front connecting portion, the outer wall of which has external threads. The glue-passing head has a mounting groove at its shaft center, and the inner wall of the mounting groove has internal threads that match the external threads. This configuration facilitates the processing of fluid channels.

[0011] In one embodiment of the first aspect, the outer wall of the glue applicator is provided with a wrench position. The wrench position is mainly for the convenience of installing and fixing the entire screw head assembly onto the screw, making it easy to tighten with a wrench, and the glue applicator installed on the screw head also needs to be easy to tighten with a wrench.

[0012] In one embodiment of the first aspect, the front end of the front connecting portion is provided with a front wrench position. The front wrench position is provided to facilitate the installation of the screw head onto the screw and to facilitate tightening with a wrench.

[0013] In one embodiment of the first aspect, the rear end of the rear connector is provided with a rear wrench position. The rear wrench position is provided to facilitate tightening with a rubber-tightening wrench.

[0014] In one embodiment of the first aspect, the meson is integrally fixed to the guide portion; or the meson is fixedly mounted to the guide portion via a guide. The guide described in this application is prior art; for example, a threaded connection is a common type of guide.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this application, by setting a fluid channel inside the glue-passing head, the contact surface between the tail end of the glue-passing part and the check ring is greatly increased. Compared with the existing method of welding tungsten carbide alloy, it has better wear resistance, lower cost, and is more convenient to produce. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the existing screw head assembly structure; Figure 2 for Figure 1 Sectional view of AA; Figure 3 This is a schematic diagram of the overall structure of the screw head assembly in this application; Figure 4 This is a schematic diagram of the screw head structure in this application; Figure 5 This is a schematic diagram of the adhesive applicator in this application; Figure 6 This is a schematic diagram of the structure of the end face of the glue applicator in Example 1; Figure 7 This is a schematic diagram of the structure of the end face of the glue applicator in Example 2; Figure 8 The diagrams are schematic representations of the stop loop structure in Examples 1 and 2. Figure 9 This is a schematic diagram of the adhesive applicator in Example 3; Figure 10 This is a schematic diagram of the non-reverse loop structure in Example 3; Figure 11 This is a schematic diagram of the overall structure of the screw head assembly in Example 3.

[0017] In the attached diagram, 1 is the screw head, 11 is the front wrench position, 12 is the front connecting part, 13 is the glue-passing part, 14 is the guide part, 15 is the rear connecting part, 16 is the rear wrench position, 2 is the glue-passing head, 21 is the fluid channel, 22 is the mounting groove, 23 is the wrench position, 24 is the frustum structure, 3 is the check ring, 31 is the conical surface, 4 is the medium, and 5 is the flow guide groove. Detailed Implementation

[0018] Unless otherwise defined, the technical or scientific terms used in this specification and claims shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. All values ​​listed herein, ranging from the minimum to the maximum, refer to all values ​​obtained by incrementing the minimum and maximum values ​​by one unit when the difference between the minimum and maximum values ​​is more than two units.

[0019] The following describes specific embodiments of this utility model. It should be noted that, in order to provide a concise description, this specification cannot provide a detailed description of all features of the actual embodiments. Without departing from the spirit and scope of this utility model, those skilled in the art can modify and substitute the embodiments of this utility model, and the resulting embodiments are also within the protection scope of this utility model. Example

[0020] The embodiments of this utility model will be described in detail below. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments. Example 1

[0021] A surface-contact wear-resistant screw head assembly, the structure of which is as follows: Figure 3 As shown, it includes a screw head 1, a glue-passing head 2, a check ring 3, and a separator 4. The structure of the screw head 1 is as follows: Figure 4 As shown, from front to back, it includes a front wrench position 11, a front connecting part 12, a glue-applying part 13, a guide part 14, a rear connecting part 15, and a rear wrench position 16. External threads are provided on the outer walls of the front connecting part 12 and the rear connecting part 15. The structure of the glue-applying head 2 is as follows... Figure 5 As shown, a mounting groove 22 is provided at its axis, and the inner wall of the mounting groove 22 is provided with internal threads. The mounting groove 22 matches the front connecting part 12. The glue-feeding head 2 is installed at the front end of the screw head 1 through the cooperation of the mounting groove 22 and the front connecting part 12. In the glue-feeding head 2, 15 fluid channels 21 are evenly arranged around its axis, such as... Figure 6 As shown. A wrench position 23 is provided on the outer wall of the glue head 2. The structure of the check ring 3 is as follows. Figure 8 As shown, the check ring 3 is sleeved on the outside of the glue-passing part 13, and when the check ring 3 moves forward, it can abut against the tail end face of the glue-passing part 13, and the contact surface is area C, which is a surface contact. The separator 4 is integrally installed on the guide part 14 of the screw head 1. The entire screw head assembly is installed on the front end of the screw through the rear connecting part 15.

[0022] Existing screw head assemblies typically employ a process of welding tungsten carbide alloy, requiring first machining the groove, then welding (the welding temperature is very high, exceeding 1000℃, which easily leads to bending and deformation), and finally machining off the excess alloy. This process results in high alloy hardness, wasted cutting tools, and adds three additional steps: machining the groove, welding the assembly, and machining the alloy. Even with tungsten carbide welding, the screw head assembly exhibits significant wear after approximately six months. In contrast, the screw head assembly of this embodiment, in practical application, under the same usage conditions, only shows similar severe wear after more than one year. Therefore, compared to existing tungsten carbide welding methods, this application demonstrates superior wear resistance. Example 2

[0023] In this embodiment, the structure of the screw head assembly is roughly the same as that in Embodiment 1, except that: In this embodiment, the fluid channels 21 are fan-shaped, with a total of 4 channels, evenly distributed around the axis of the nozzle 2, as shown in the figure below. Figure 7 As shown. Practical verification has demonstrated that the wear resistance of the screw head assembly in this embodiment is superior to that of existing technologies. Example 3

[0024] In this embodiment, the structure of the screw head assembly is roughly the same as that in Embodiment 1, except that: In this embodiment, the end face of the glue applicator has a frustum-shaped structure 24, meaning it is not a plane, specifically as follows: Figure 9 As shown, on the inner side wall of the front end of the check ring, there is a conical surface 31 with the same slope, as... Figure 10 As shown, during installation, the two fit together perfectly, as... Figure 11 As shown.

[0025] The above description of the embodiments is intended to enable those skilled in the art to understand and apply this application. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, this application is not limited to the embodiments described herein, and any improvements and modifications made by those skilled in the art based on the disclosure of this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A surface contact wear-resistant screw head assembly, characterized in that, The screw head assembly includes a glue-passing head, a screw head, a check ring, and a separator. The screw head, from front to back, includes a glue-passing section, a guide section, and a rear connecting section. The glue-passing head is coaxially fixed to the front end of the screw head. The separator is fixedly mounted on the guide section. The check ring is sleeved on the outside of the glue-passing section, and its front and rear ends are restricted from movement by the tail end of the glue-passing head and the front end of the separator, respectively. The glue-passing head has multiple fluid channels that run through it from front to back evenly in the middle.

2. The surface contact wear-resistant screw head assembly as described in claim 1, characterized in that, The number of fluid channels is 2 to 100.

3. The surface contact wear-resistant screw head assembly as described in claim 1, characterized in that, The outer edge of the end face of the glue-overhead head is less than or equal to the outer edge of the end face of the front face of the check ring.

4. The surface contact wear-resistant screw head assembly as described in claim 1, characterized in that, The glue-applying head is detachably installed at the front end of the screw head. The front end of the screw head is provided with a front connecting part. The outer wall of the front connecting part is provided with an external thread. The glue-applying part is provided with a mounting groove at its axis. The inner wall of the mounting groove is provided with an internal thread that matches the external thread.

5. The surface contact wear-resistant screw head assembly as described in claim 4, characterized in that, The outer wall of the glue applicator is provided with a wrench position.

6. The surface contact wear-resistant screw head assembly as described in claim 4, characterized in that, The front end of the front connector is provided with a front wrench position.

7. The surface contact wear-resistant screw head assembly as described in claim 1, characterized in that, The rear end of the rear connector is provided with a rear wrench position.

8. The surface contact wear-resistant screw head assembly as described in claim 1, characterized in that, The meson is integrally fixed to the guide portion; or the meson is fixedly installed on the guide portion via a guide.

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