A high-precision guide post sliding structure

Abstract

This utility model relates to the field of injection molding machines and discloses a high-precision guide post sliding structure, including an injection molding machine stage, a linear guide rail, a pull rod, and a sliding component. The injection molding machine stage is connected to the sliding component, and the sliding component has a through hole. The pull rod passes through the through hole and slides with it. The linear guide rail is located below the injection molding machine stage, and a slider is slidably connected to the linear guide rail. The injection molding machine stage is connected to the slider. The linear guide rail serves both as a guide and to overcome the gravity of the moving parts, reducing friction and improving the movement accuracy of the stage.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and in particular to a high-precision guide post sliding structure. Background Technology

[0002] In the field of injection molding equipment, the injection unit assembly, as the core functional unit for achieving precise injection of molten plastic, directly affects the operational accuracy and stability of the equipment due to the reliability of its motion guidance system. Traditional injection unit structures generally adopt a four-column symmetrical guidance mechanism, the core components of which include a fixed base, reciprocating motion components, and guide support components. The guide components mainly consist of a mating pair structure formed by guide columns and copper bushings.

[0003] In the current technical solution, the copper bushing (No.: SNB-7-3 type cast copper alloy) needs to simultaneously perform dual mechanical functions: on the one hand, as a guiding element, it needs to ensure that the injection stage assembly makes high-precision linear motion along the axial direction; on the other hand, as a load-bearing component, it needs to bear the overall gravity load of the injection stage. In actual working conditions, due to the inertial impact (peak acceleration can reach 0.8g) generated by the frequent start and stop of the injection mechanism, combined with the continuous contact stress under long-term gravity, the inner wall of the copper bushing and the surface of the guide post will undergo progressive wear. According to industrial field data, under continuous operation, the linear wear rate of the copper bushing can reach 0.015-0.03mm / thousand-hour. When the cumulative clearance increases to the 0.5mm threshold, it will cause the motion trajectory of the injection stage to deviate (typical value > 0.2mm / 300mm stroke), directly causing the coaxiality deviation between the melt cylinder and the mold gate, which in turn causes injection pressure fluctuations (amplitude can reach ±12%), flash and other process defects in the product. Therefore, it is necessary to further improve the existing motion guiding system to reduce the wear of the copper bushing. Utility Model Content

[0004] The purpose of this application is to provide a high-precision guide post sliding structure to solve the problem that in existing launcher assemblies, the copper sleeve, on the one hand, needs to ensure high-precision linear movement of the launcher assembly along the axial direction as a guiding element, and on the other hand, needs to bear the overall gravity load of the launcher. In actual working conditions, due to inertial impact and gravity, the inner wall of the copper sleeve and the surface of the guide post will experience progressive wear. The specific technical solution is as follows:

[0005] A high-precision guide post sliding structure includes an injection molding machine injection unit, a linear guide rail, a pull rod, and a sliding component. The injection molding machine injection unit is connected to the sliding component. The sliding component has a through hole, through which the pull rod passes and slides. The linear guide rail is located below the injection molding machine injection unit, and a slider is slidably connected to the linear guide rail. The injection molding machine injection unit is connected to the slider.

[0006] The end of the linear guide is connected to a lubrication device, which is connected to an elastic trigger switch. The elastic trigger switch is located on the movement path of the slider and is configured such that when the elastic trigger switch is triggered by the slider, the lubrication device is activated, causing the lubrication device to output lubricating oil to the linear guide.

[0007] As an improvement to the above technical solution, a copper sleeve is installed inside the through hole, and the pull rod passes through the copper sleeve and slides with it.

[0008] As an improvement to the above technical solution, the linear guide rail has an oil passage arranged along the length of the linear guide rail, and the linear guide rail has a plurality of outlets equidistantly distributed along the length of the linear guide rail. The outlets are connected to the oil passages, and the oil passages are connected to the lubrication device.

[0009] As an improvement to the above technical solution, the lubrication device includes a housing, inside which is a tapered channel that gradually narrows from top to bottom. The bottom of the housing is provided with an output pipe, which is connected to the narrowing end of the tapered channel. The elastic trigger switch is connected to the output pipe and is used to control the opening or closing of the output pipe.

[0010] As an improvement to the above technical solution, the elastic trigger switch includes a movable rod, a spring, and a base. The base is cylindrical, and the spring and the movable rod are disposed inside the base. The two ends of the spring are respectively connected to the inner bottom surface of the base and the end of the movable rod. The movable rod passes horizontally through the output pipe, and an opening is provided on the movable rod, which is disposed inside the output pipe.

[0011] As an improvement to the above technical solution, the output pipe is vertically connected to a limiting tube, the limiting tube is in the shape of a cuboid, the limiting tube is provided with a sliding groove and communicates with the output pipe, and the movable rod passes through the sliding groove and the output pipe.

[0012] As an improvement to the above technical solution, the inner wall of the chute is provided with a first sealing ring and a second sealing ring, which are disposed on opposite sides of the output pipe.

[0013] As an improvement to the above technical solution, the top surface of the linear guide rail is provided with two grooves, which are arranged on opposite sides of the outlet.

[0014] The beneficial effects of this application are: the linear guide rail takes into account both guidance and overcoming the gravity of moving parts. This design further ensures uniform circumferential clearance of the guide post, reduces friction, and improves the movement accuracy of the injection stage. When the slider moves to the set position, automatic lubrication can be triggered. The overall design realizes high-precision guidance, automatic lubrication and low maintenance, effectively improving the injection positioning accuracy, equipment stability and service life of the injection molding machine.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the lubrication device of this utility model.

[0019] Figure 3 This is a schematic diagram of the linear guide rail of this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the movable rod of this utility model.

[0021] Figure 5 This is a schematic diagram of the limiting tube of this utility model.

[0022] In the diagram: 1. Injection molding machine injection unit; 2. Linear guide rail; 3. Tie rod; 4. Sliding component; 5. Slider; 6. Lubrication device; 7. Elastic trigger switch; 8. Limit tube; 9. First sealing ring; 10. Second sealing ring; 21. Oil passage; 22. Outlet; 23. Groove; 61. Housing; 62. Conical channel; 63. Output pipe; 71. Movable rod; 72. Base; 73. Spring; 711. Opening. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Please see Figures 1-5 In this embodiment of the invention, a high-precision guide column sliding structure includes an injection molding machine injection unit 1, a linear guide rail 2, a pull rod 3, and a sliding component 4. The injection molding machine injection unit 1 is connected to the sliding component 4, which has a through hole through which the pull rod 3 passes and slides. The linear guide rail 2 is located below the injection molding machine injection unit 1, and a slider 5 is slidably connected to the linear guide rail 2. The injection molding machine injection unit 1 is connected to the slider 5. A lubrication device 6 is connected to the end of the linear guide rail 2, and an elastic trigger switch 7 is connected to the lubrication device 6. The elastic trigger switch 7 is located on the movement path of the slider 5 and is configured such that when the elastic trigger switch 7 is triggered by the slider 5, the lubrication device 6 opens, causing the lubrication device 6 to output lubricating oil to the linear guide rail 2. When the slider 5 moves to a set position, automatic lubrication is triggered. The overall design achieves high-precision guidance, automatic lubrication, and low maintenance, effectively improving the injection positioning accuracy, equipment stability, and service life of the injection molding machine.

[0025] Preferably, the slider 5 and the linear guide rail 2 adopt a slight interference or preload design to eliminate gaps and reduce vibration, further improving positioning stability. The elastic trigger switch 7 is placed at the extreme position of the slider 5's movement. It should be noted that this position may not be the position where the slider 5 will be triggered during operation. Only when lubrication is required will the slider 5 be slid to the position where the elastic trigger switch 7 can be triggered. When the slider 5 moves to this position, it squeezes the switch, automatically opening the lubrication device 6, thereby achieving action triggering and precise lubrication, reducing manual maintenance intervention, and preventing over-lubrication or lack of oil. Alternatively, by preset lubrication cycle, the elastic trigger switch 7 can automatically control the lubrication timing and frequency, eliminating insufficient or excessive lubrication during long-term operation, resulting in low oil consumption and less intervention.

[0026] In some embodiments, a copper sleeve is installed in the through hole, and the pull rod 3 passes through the copper sleeve and slides with it. In the through hole of the original sliding component 4, a copper sleeve made of high-purity brass is added. The inner diameter of the copper sleeve is precisely matched with the outer diameter of the pull rod 3. The pull rod 3 passes through the copper sleeve and slides with it to replace the original direct metal-metal contact engagement method, thereby optimizing the sliding surface quality and reducing wear.

[0027] The linear guide 2 has an oil passage 21 arranged along the length of the linear guide 2 inside. The linear guide 2 has several outlets 22 that are equidistantly distributed along the length of the linear guide 2. The outlets 22 are connected to the oil passages 21, and the oil passages 21 are connected to the lubrication device 6. By setting multiple outlets 22, the entire linear guide 2 can be uniformly lubricated.

[0028] Regarding the lubrication device 6, the lubrication device 6 includes a housing 61. Inside the housing 61 is a tapered channel 62 that gradually narrows from top to bottom. At the bottom of the housing 61 is an output pipe 63, which communicates with the narrowing end of the tapered channel 62. An elastic trigger switch 7 is connected to the output pipe 63 and is used to control the opening or closing of the output pipe 63. The elastic trigger switch 7 includes a movable rod 71, a spring 73, and a base 72. The base 72 is cylindrical. The spring 73 and the movable rod 71 are disposed inside the base 72. The two ends of the spring 73 are connected to the inner bottom surface of the base 72 and the end of the movable rod 71, respectively. The movable rod 71 passes horizontally through the output pipe 63. The movable rod 71 is provided with an opening 711, which is located inside the output pipe 63. The tapered channel 62 is filled with lubricating oil. After the elastic trigger switch 7 is triggered, the movable rod 71 moves horizontally and the opening 711 enters the output pipe 63 (by default, when the spring 73 is in the extended state, the opening 711 is misaligned with the output pipe 63, and the output pipe 63 is closed). When the opening 711 is connected to the output pipe 63, the lubricating oil can enter the oil passage 21 through the opening 711. When the amount of lubricating oil in the oil passage 21 reaches a certain level, it will overflow from the outlet 22 onto the surface of the linear guide rail 2 to achieve lubrication.

[0029] Preferably, the output pipe 63 is vertically connected to the limiting pipe 8, which is rectangular in shape. The limiting pipe 8 has a groove and communicates with the output pipe 63. The movable rod 71 passes through the groove and the output pipe 63. The inner wall of the groove is embedded with a first sealing ring 9 and a second sealing ring 10. The first sealing ring 9 and the second sealing ring 10 are located on opposite sides of the output pipe 63. The first sealing ring 9 and the second sealing ring 10 are used to prevent lubricating oil from leaking out.

[0030] To prevent lubricating oil leakage, in some embodiments, the top surface of the linear guide 2 is provided with two grooves 23, which are located on opposite sides of the outlet 22.

[0031] It should be noted that the terms "first," "second," etc., used in this document are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A high-precision guide post sliding structure, characterized in that, The system includes an injection molding machine injection unit, a linear guide rail, a tie rod, and a sliding component. The injection molding machine injection unit is connected to the sliding component, which has a through hole through which the tie rod passes and slides. The linear guide rail is located below the injection molding machine injection unit, and a slider is slidably connected to the linear guide rail. The injection molding machine injection unit is connected to the slider. The end of the linear guide is connected to a lubrication device, which is connected to an elastic trigger switch. The elastic trigger switch is located on the movement path of the slider and is configured such that when the elastic trigger switch is triggered by the slider, the lubrication device is activated, causing the lubrication device to output lubricating oil to the linear guide.

2. The high-precision guide pillar sliding structure according to claim 1, characterized in that: A copper sleeve is installed inside the through hole, and the pull rod passes through the copper sleeve and slides with it.

3. The high-precision guide pillar sliding structure according to claim 1, characterized in that: The linear guide rail has an oil passage inside that is arranged along the length of the linear guide rail. The linear guide rail has a plurality of outlets that are equidistantly distributed along the length of the linear guide rail. The outlets are connected to the oil passages, and the oil passages are connected to the lubrication device.

4. The high-precision guide pillar sliding structure according to claim 3, characterized in that: The lubrication device includes a housing, inside which is a tapered channel that gradually narrows from top to bottom. The bottom of the housing is provided with an output pipe, which is connected to the narrowing end of the tapered channel. The elastic trigger switch is connected to the output pipe and is used to control the opening or closing of the output pipe.

5. The high-precision guide pillar sliding structure according to claim 4, characterized in that: The elastic trigger switch includes a movable rod, a spring, and a base. The base is cylindrical, and the spring and the movable rod are disposed inside the base. The two ends of the spring are respectively connected to the inner bottom surface of the base and the end of the movable rod. The movable rod passes horizontally through the output pipe and has an opening inside the output pipe.

6. The high-precision guide pillar sliding structure according to claim 5, characterized in that: The output pipe is vertically connected to a limiting tube, which is rectangular in shape and has a groove that communicates with the output pipe. The movable rod passes through the groove and the output pipe.

7. The high-precision guide pillar sliding structure according to claim 6, characterized in that: The inner wall of the chute is fitted with a first sealing ring and a second sealing ring, which are located on opposite sides of the output pipe.

8. The high-precision guide pillar sliding structure according to claim 3, characterized in that: The top surface of the linear guide rail is provided with two grooves, which are located on opposite sides of the outlet.

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