A mold adjusting nut for a gate column in an injection molding machine and the injection molding machine.

Abstract

This utility model discloses an adjusting nut for a gatepost in an injection molding machine and an injection molding machine. The adjusting nut includes a base and a ring; the inner circumference of the ring is threaded, and the wall thickness of the ring decreases sequentially from the first end to the second end of the adjusting nut's axial direction. A through hole adapted to the shape of the ring is formed on the base, and the ring is fixed within the through hole. The base is made of an iron alloy, and the ring is made of a copper alloy. This adjusting nut not only has low manufacturing costs but also effectively prevents thread jamming between the adjusting nut and the gatepost, while also possessing high structural stability.

Description

Technical Field

[0001] This utility model belongs to the field of injection molding machine technology, and specifically relates to an adjusting nut for an injection molding machine guide column and an injection molding machine. Background Technology

[0002] The clamping force of an injection molding machine is a key parameter for ensuring tight mold closure and preventing molten plastic overflow. The gateposts and adjusting nuts are the core components for adjusting this clamping force. Specifically, rotating the adjusting nut changes its position on the gateposts, thereby precisely adjusting the distance between the moving and fixed mold plates to accommodate molds of different thicknesses (i.e., the "mold adjustment" process). The adjusting nut plays a crucial role in transmitting kinetic loads during mold adjustment and in transmitting axial force during the establishment of the clamping force. During the establishment of the clamping force, the moving mold plate of the injection molding machine applies an axial clamping force to the adjusting nut through the support plate. This force is an alternating load during production, which may cause damage to the threads of the adjusting nut due to prolonged application of the clamping force, potentially leading to gatepost jamming. Therefore, the material used for the adjusting nut needs to have good ductility, flexibility, and thermal conductivity to ensure a stable fit between the adjusting nut and the gateposts.

[0003] Currently, existing mold-adjusting nuts are all made of a single material, such as copper alloy or ductile iron. While copper alloys offer good ductility and flexibility, making them less prone to breakage under certain deformation, and also have good thermal conductivity and a low coefficient of friction, effectively preventing damage to the threads due to overheating or wear, their high price significantly increases the cost of injection molding machines. Ductile iron, although inexpensive, suffers from poor mechanical properties and low reliability, making it prone to jamming of the mold-adjusting nut and tie rods. Utility Model Content

[0004] To address the aforementioned problems, this utility model discloses an adjusting nut for a gate column in an injection molding machine and an injection molding machine, thereby overcoming or at least partially solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses, in one aspect, an adjusting nut for a gate column of an injection molding machine, the adjusting nut comprising a base and a ring sleeve;

[0007] The inner circumference of the ring sleeve is threaded, and the wall thickness of the ring sleeve decreases sequentially from the first end of the mold adjusting nut axial direction to the second end of the mold adjusting nut axial direction. A through hole adapted to the shape of the ring sleeve is formed on the base body, and the ring sleeve is fixed in the through hole. The base body is made of iron alloy, and the ring sleeve is made of copper alloy.

[0008] Furthermore, an annular oil distribution groove is formed on the outer circumference of the substrate, and multiple first radial oil passages are formed in the substrate along the circumference of the substrate. Multiple second radial oil passages corresponding to the first radial oil passages are formed in the annular sleeve. The first end of each first radial oil passage is connected to the oil distribution groove, and the second end of each first radial oil passage is connected to the first end of the corresponding second radial oil passage. The second end of each second radial oil passage extends to the thread.

[0009] Furthermore, a flange extends radially along the outer circumference of the first end of the ring sleeve. The outer diameter of the flange is larger than the inner diameter of the through hole at the first end of the base. The flange is located outside the through hole and abuts against the end face of the first end of the base.

[0010] Furthermore, a first step is formed on the outer circumference of the first end of the substrate, and a plurality of screw holes are formed on the end face of the first step, so that the mold adjusting nut can be connected to the gear through the screw holes and bolts.

[0011] Furthermore, a second step is formed on the outer circumference of the first step, and an annular first pad is fixed on the end face of the second step; a third step is formed on the outer circumference of the second end of the substrate, and an annular second pad is fixed on the end face of the third step.

[0012] Both the first pad and the second pad are made of copper alloy.

[0013] Furthermore, the first pad is fixed to the end face of the second step by welding or bonding, and the second pad is fixed to the end face of the third step by welding or bonding.

[0014] Furthermore, the substrate and the ring are fixedly connected by adhesive bonding, welding, or flat key connection.

[0015] Another aspect of this utility model discloses an injection molding machine, which includes a bed, a moving platen, a fixed platen, a gatepost, a mold adjusting motor, a drive gear, a transmission gear, a driven gear, a pressure cap, a support plate, and the aforementioned mold adjusting nut for the gatepost of the injection molding machine;

[0016] The fixed template is fixed to one end of the bed, the movable template is slidably disposed on the bed and corresponds to the position of the fixed template, the second end of the tie rod is connected to the fixed template, the mold adjusting nut is sleeved on the first end of the tie rod and the second end of the mold adjusting nut is close to the movable template, the mold adjusting nut is axially limited on the support plate by the pressure cover and can rotate circumferentially relative to the support plate, the support plate is connected to the movable template, the driven gear is fixed on the first end face of the mold adjusting nut and meshes with the transmission gear, the transmission gear meshes with the driving gear and rotates, and the driving gear is fixed on the output shaft of the mold adjusting motor.

[0017] The advantages and beneficial effects of this utility model are:

[0018] In this utility model, the mold-adjusting nut is composed of a base and a ring. The base is made of iron alloy, and the ring is made of copper alloy. This not only reduces the manufacturing cost of the mold-adjusting nut but also improves the flexibility and thermal conductivity of the contact surface between the mold-adjusting nut and the tie rod, and reduces the coefficient of friction, effectively preventing thread jamming between the mold-adjusting nut and the tie rod. Furthermore, by setting the wall thickness of the ring to decrease sequentially from the first end to the second end of the mold-adjusting nut's axial direction, and by matching the shape of the base to the shape of the ring, the separation of the base and the ring can be effectively prevented when the clamping force of the injection molding machine acts on the mold-adjusting nut, giving the mold-adjusting nut high structural stability. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0020] Figure 1 This is an axial cross-sectional view of the mold-adjusting nut in one embodiment of the present invention;

[0021] Figure 2 This is a front view of the mold-adjusting nut in one embodiment of the present invention;

[0022] Figure 3 This is a left view of the mold-adjusting nut in one embodiment of the present invention;

[0023] Figure 4 This is an axial cross-sectional view of the mold-adjusting nut in another embodiment of the present invention;

[0024] Figure 5 This is a three-dimensional structural diagram of an injection molding machine in another embodiment of the present invention;

[0025] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0026] Figure 7 This is a front view of an injection molding machine in another embodiment of the present invention;

[0027] Figure 8 for Figure 7 A magnified view of a section at point B.

[0028] In the diagram: 1. Base; 1-1. Oil distribution groove; 1-2. First radial oil passage; 1-3. First step; 1-4. Second step; 1-5. Third step; 1-6. Screw hole; 2. Ring sleeve; 2-1. Thread; 2-2. Second radial oil passage; 2-3. Flange; 3. First pad; 4. Second pad; 5. Bed; 6. Moving template; 7. Fixed template; 8. Tie column; 9. Mold adjustment motor; 10. Drive gear; 11. Transmission gear; 12. Driven gear; 13. Pressure cap; 14. Support plate; 15. Mold adjustment nut; 16. Oil injection port; 17. Bolt. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, 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 scope of protection of this utility model.

[0030] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] To facilitate explanation and understanding of the technical solution of this utility model, it is hereby ordered that... Figure 1 The left side of the adjusting nut is the first end of the adjusting nut. Figure 1 The right side of the adjusting nut is the second end of the adjusting nut.

[0034] The technical solutions provided by the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0035] One embodiment of this utility model provides a mold-adjusting nut for a gatepost in an injection molding machine, such as... Figure 1 and Figure 3 As shown, the adjusting nut includes a base 1 and a ring 2.

[0036] Specifically, a thread 2-1 is formed on the inner circumference of the ring sleeve 2, which can mate with the external thread on the tie rod. The wall thickness of the ring sleeve 2 decreases sequentially from the first end of the mold adjusting nut axial direction to the second end of the mold adjusting nut axial direction, that is, the axial section of the ring sleeve 2 is an isosceles trapezoid. A through hole adapted to the shape of the ring sleeve 2 is formed on the base 1. Similarly, the axial section of the through hole is also an isosceles trapezoid. The ring sleeve 2 is fixed in the through hole. The base 1 is made of iron alloy, and the ring sleeve 2 is made of copper alloy. The base 1 is preferably made of 45 steel.

[0037] Understandably, ferroalloys are not only inexpensive but also strong, effectively reducing the manufacturing cost of the adjusting nut. Since the bushing directly contacts the tie post, using a copper alloy with good ductility, flexibility, thermal conductivity, and a low coefficient of friction for the bushing ensures a smoother fit between the adjusting nut and the tie post, effectively preventing thread jamming. Although a more expensive copper alloy is used in this process, it is only used on the bushing, requiring relatively little material, and will not significantly increase the manufacturing cost of the adjusting nut.

[0038] When the adjusting nut is made entirely of copper alloy, the required mass of copper alloy is 21 kg, and the unit price of copper alloy is 60 yuan / kg, resulting in a material cost of 1260 yuan for the adjusting nut. When the base is made of 45# steel, the required mass of 45# steel is 18 kg, and the ring is made of copper alloy, the required mass of copper alloy is 3 kg. The unit price of 45# steel is 4.5 yuan / kg, and the unit price of copper alloy is 60 yuan / kg, resulting in a material cost of only 261 yuan for the adjusting nut. It is evident that the structural design of the adjusting nut in this embodiment significantly reduces its manufacturing cost.

[0039] It should be noted that when assembling and using the mold adjusting nut, the first end of the mold adjusting nut is positioned away from the moving mold plate, and the second end of the mold adjusting nut is positioned close to the moving mold plate. This ensures that the direction of the mold closing force applied to the mold adjusting nut by the support plate connected to the moving mold plate during the mold closing force establishment process is from the second end of the mold adjusting nut along its axial direction to the first end of the mold adjusting nut along its axial direction. At this time, the base 1 will generate an axial force on the ring 2, and the direction of this force is towards... Figure 1 On the left side. Thus, by setting the axial cross-sections of the through holes on both the ring sleeve 2 and the base 1 as isosceles trapezoids, it is possible to effectively prevent the ring sleeve 2 and the base 1 from separating when the clamping force acts on the adjusting nut. Understandably, the connection between the base 1 and the ring sleeve 2 is an inclined plane viewed from the axial direction, which not only satisfies the transmission of heavy, unidirectional forces during the establishment of the clamping force, but also reduces the requirements for the connection strength of the connection surface between the base 1 and the ring sleeve 2.

[0040] In summary, in this embodiment of the mold-adjusting nut, by setting the mold-adjusting nut into two parts, a base and a ring, with the base made of iron alloy and the ring made of copper alloy, not only is the manufacturing cost of the mold-adjusting nut lower, but the contact surface between the mold-adjusting nut and the tie rod also has better flexibility and thermal conductivity, and a lower coefficient of friction, effectively preventing the threads between the mold-adjusting nut and the tie rod from jamming. Furthermore, by setting the wall thickness of the ring to decrease sequentially from the first end to the second end of the mold-adjusting nut axial direction, and by matching the shape of the base to the shape of the ring, the separation of the base and the ring can be effectively prevented when the clamping force of the injection molding machine acts on the mold-adjusting nut, giving the mold-adjusting nut high structural stability.

[0041] In this embodiment, as Figure 1 and Figure 2 As shown, an annular oil distribution groove 1-1 is formed on the outer circumference of the base 1. Multiple first radial oil passages 1-2 are formed in the base 1 along the circumference of the base 1. Multiple second radial oil passages 2-2 corresponding to the first radial oil passages 1-2 are formed in the ring sleeve 2. The first end of each first radial oil passage 1-2 is connected to the oil distribution groove 1-1. The second end of each first radial oil passage 1-2 is connected to the first end of the corresponding second radial oil passage 2-2. That is, the number of first radial oil passages 1-2 and second radial oil passages 2-2 is the same and their positions correspond. The second end of each second radial oil passage 2-2 extends to the thread 2-1.

[0042] In this way, the lubricating oil in the oil distribution groove 1-1 can enter the second radial oil passage 2-2 through the first radial oil passage 1-2, and finally flow to the thread 2-1 to achieve lubrication of the thread 2-1, ensuring a smoother fit between the mold adjusting nut and the tie rod.

[0043] In another embodiment of this utility model, such as Figure 4 As shown, a flange 2-3 extends radially along the outer circumference of the first end of the ring 2. The outer diameter of the flange 2-3 is larger than the inner diameter of the through hole at the first end of the base 1. The flange 2-3 is located outside the through hole and abuts against the end face of the first end of the base 1. By setting the flange 2-3, when the support plate applies a mold-closing force to the mold-adjusting nut, the flange 2-3 can share part of the mold-closing force, preventing the ring 2 from detaching from the base 1, further reducing the requirements for the connection strength of the connection surface between the base 1 and the ring 2, and ensuring the stability of the mold-adjusting nut structure.

[0044] In this embodiment, as Figure 1 and Figure 3 As shown, a first step 1-3 is formed on the outer circumference of the first end of the base 1, and a plurality of screw holes 1-6 are formed on the end face of the first step 1-3, so that the mold adjusting nut can be connected to the gear through the screw holes 1-6 and the bolt, thereby facilitating the fixed connection between the mold adjusting nut and the gear.

[0045] And, as Figure 1 As shown, a second step 1-4 is formed on the outer circumference of the first step 1-3, and an annular first pad 3 is fixed on the end face of the second step 1-4. A third step 1-5 is formed on the outer circumference of the second end of the base 1, and an annular second pad 4 is fixed on the end face of the third step 1-5.

[0046] The first pad 3 and the second pad 4 are both made of copper alloy.

[0047] It should be noted that when the mold adjusting nut is connected to the support plate, the end face of the third step 1-5 abuts against the support plate, the pressure cap presses against the end face of the second step 1-4, and is fixedly connected to the support plate, so that the mold adjusting nut can be axially fixed to the support plate and can rotate circumferentially relative to the support plate. By setting a second copper alloy pad 4 between the third step 1-5 and the support plate, and setting a first copper alloy pad 3 between the second step 1-4 and the pressure cap, it is possible to effectively prevent the mold adjusting nut from sticking to the support plate and the pressure cap respectively, and ensure that the mold adjusting nut can rotate smoothly relative to the support plate and the pressure cap.

[0048] The first pad 3 is fixed to the end face of the second step 1-4 by welding or bonding, and the second pad 4 is fixed to the end face of the third step 1-5 by welding or bonding, making it easier for the first pad 3 and the second pad 4 to connect with the mold adjusting nut 1-5 respectively.

[0049] Furthermore, in this embodiment, the base 1 and the ring 2 are connected by a flat key, which effectively prevents relative rotation between the base 1 and the ring 2, ensuring the firmness of the connection. Of course, the base and the ring can also be connected by adhesive bonding or welding, or the connection between the base and the ring can be achieved by a combination of flat key connection and adhesive bonding or welding.

[0050] Another embodiment of this utility model provides an injection molding machine, such as Figures 5 to 8 As shown, the injection molding machine includes a bed 5, a moving platen 6, a fixed platen 7, a gatepost 8, a mold adjusting motor 9, a drive gear 10, a transmission gear 11, a driven gear 12, a pressure cap 13, a support plate 14, and a mold adjusting nut 15 for the gatepost of the injection molding machine in the above embodiment.

[0051] Specifically, the fixed template 7 is fixed to one end of the bed 5, and the movable template 6 is slidably mounted on the bed 5. For example, the movable template 6 is connected to the bed 5 through a slide rail structure. The positions of the movable template 6 and the fixed template 7 are corresponding. The second end of the guide column 8 is connected to the fixed template 7. The mold adjusting nut 15 is sleeved on the first end of the guide column 8, and the second end of the mold adjusting nut 15 is close to the movable template 6. The mold adjusting nut 15 is axially limited on the support plate 14 by the pressure cover 13 and can rotate circumferentially relative to the support plate 14. The support plate 14 is connected to the movable template 6. The driven gear 12 is fixed to the first end face of the mold adjusting nut 15 by bolts 17 and meshes with the transmission gear 11 for transmission. The transmission gear 11 meshes with the driving gear 10 for rotation. The driving gear 10 is fixed on the output shaft of the mold adjusting motor 9.

[0052] It should be noted that the clamping force F generated on the moving template 6 acts on the adjusting nut 15 through the support plate 14, and the direction of the clamping force F is away from the moving template 6.

[0053] In this embodiment, the process of mold adjustment by the injection molding machine is as follows:

[0054] The mold adjusting motor 9 drives the drive gear 10 to rotate, which in turn drives the transmission gear 11 to rotate. The transmission gear 11 then drives the driven gear 12 to rotate, which in turn drives the mold adjusting nut 15 to rotate. Since the mold adjusting nut 15 and the guide post 8 are connected by a threaded structure, the mold adjusting nut 15 moves axially along the guide post 8. Because the mold adjusting nut 15 is connected to the support plate 14 via the pressure cap 13, the axial movement of the mold adjusting nut 15 drives the support plate 14 to move, which in turn drives the moving template 6 to move. This allows for adjustment of the distance between the moving template 6 and the fixed template 7, thus achieving the function of adjusting the mold thickness. Specifically, the mold thickness can be adjusted by adjusting the forward or reverse rotation of the mold adjusting nut 15 to move the moving template 6 forward or backward.

[0055] Compared to existing injection molding machines, this injection molding machine not only has a lower manufacturing cost, but also a lower probability of jamming of the mold adjusting nut 15 and the guide column 8.

[0056] And, as Figure 6 As shown, the pressure cap 13 is provided with an oil inlet 16. The position of the oil inlet 16 corresponds to the position of the oil distribution groove. Lubricating oil can be injected into the oil distribution groove through the oil inlet 16.

[0057] The above description is merely a specific embodiment of this utility model. Under the teachings of this utility model, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this utility model, and the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A mold-adjusting nut for a gatepost in an injection molding machine, characterized in that, The adjusting nut includes a base and a ring sleeve; The inner circumference of the ring sleeve is threaded, and the wall thickness of the ring sleeve decreases sequentially from the first end of the mold adjusting nut axial direction to the second end of the mold adjusting nut axial direction. A through hole adapted to the shape of the ring sleeve is formed on the base body, and the ring sleeve is fixed in the through hole. The base body is made of iron alloy, and the ring sleeve is made of copper alloy.

2. The adjusting nut for a gatepost in an injection molding machine according to claim 1, characterized in that, An annular oil distribution groove is formed on the outer circumference of the substrate. Multiple first radial oil passages are formed in the substrate and arranged circumferentially along the substrate. Multiple second radial oil passages corresponding to the first radial oil passages are formed in the annular sleeve. The first end of each first radial oil passage is connected to the oil distribution groove. The second end of each first radial oil passage is connected to the first end of the corresponding second radial oil passage. The second end of each second radial oil passage extends to the thread.

3. The adjusting nut for an injection molding machine tie rod according to claim 1, characterized in that, A flange extends radially along the outer circumference of the first end of the ring sleeve. The outer diameter of the flange is larger than the inner diameter of the through hole at the first end of the base. The flange is located outside the through hole and abuts against the end face of the first end of the base.

4. The adjusting nut for an injection molding machine tie rod according to claim 1, characterized in that, A first step is formed on the outer circumference of the first end of the substrate, and multiple screw holes are formed on the end face of the first step, so that the mold adjusting nut can be connected to the gear through the screw holes and bolts.

5. The adjusting nut for an injection molding machine guide column according to claim 4, characterized in that, A second step is formed on the outer circumference of the first step, and an annular first pad is fixed on the end face of the second step. A third step is formed on the outer circumference of the second end of the substrate, and an annular second pad is fixed on the end face of the third step. Both the first pad and the second pad are made of copper alloy.

6. The adjusting nut for an injection molding machine tie rod according to claim 5, characterized in that, The first pad is fixed to the end face of the second step by welding or bonding, and the second pad is fixed to the end face of the third step by welding or bonding.

7. The adjusting nut for an injection molding machine guide column according to any one of claims 1 to 6, characterized in that, The base and the ring are fixedly connected by adhesive bonding, welding or flat key connection.

8. An injection molding machine, characterized in that, The injection molding machine includes a bed, a moving platen, a fixed platen, a gatepost, a mold adjusting motor, a drive gear, a transmission gear, a driven gear, a pressure cap, a support plate, and a mold adjusting nut for the gatepost of the injection molding machine as described in any one of claims 1 to 7. The fixed template is fixed to one end of the bed, the movable template is slidably disposed on the bed and corresponds to the position of the fixed template, the second end of the tie rod is connected to the fixed template, the mold adjusting nut is sleeved on the first end of the tie rod and the second end of the mold adjusting nut is close to the movable template, the mold adjusting nut is axially limited on the support plate by the pressure cover and can rotate circumferentially relative to the support plate, the support plate is connected to the movable template, the driven gear is fixed on the first end face of the mold adjusting nut and meshes with the transmission gear, the transmission gear meshes with the driving gear and rotates, and the driving gear is fixed on the output shaft of the mold adjusting motor.

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