A protective cover and injection molding machine

Abstract

The utility model provides a kind of protective cover and injection molding machine, it is related to injection molding technical field.The protective cover includes cylinder and connecting pipe.Wherein, cylinder is used to cover in the piston rod of injection molding machine, and the open end of cylinder is used to be connected with the oil cylinder cover of injection molding machine, and the peripheral wall of cylinder is provided with the oil hole of unloading.Passage, accumulated lubricating oil produced in the movement of piston rod can flow along the inner wall of protective cover, discharge through oil hole, to avoid the exosmosis and drip of the internal accumulation of oil in protective cover.In the above basis, the bottom wall of cylinder is provided with air hole, air hole is used to communicate the inner chamber of cylinder and external environment, for balancing internal and external air pressure, ensure that pressure is consistent, to guarantee the smooth discharge of lubricating oil.Therefore, the utility model provides the protective cover effectively solves the problem of oil seepage of traditional closed protective cover, significantly improves the cleanness and operating safety of equipment, reduces cleaning maintenance frequency, improves the neatness of working environment.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and more specifically, to a protective cover and an injection molding machine. Background Technology

[0002] In injection molding machines, a dust seal with an inner lip is installed between the cylinder head of the injection cylinder and the protective cover of the piston rod to prevent dust from entering and protect the piston rod and cylinder body from dust. However, under long-term high-frequency reciprocating motion, lubricating oil will form an oil film on the piston rod surface and gradually accumulate at the inner lip of the dust seal. The accumulated oil cannot be discharged in time and eventually seeps out along the outer wall of the protective cover and drips from the bottom.

[0003] The inventors discovered that this oil seepage not only affects the overall appearance of the injection molding machine and causes equipment damage, but also pollutes the production environment and increases the workload of cleaning and maintenance. Furthermore, because this problem is difficult to avoid in the existing structure, operators need to regularly inspect and wipe away the oil stains, consuming significant manpower and time costs and reducing production efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a protective cover and an injection molding machine that can effectively prevent external oil leakage, realize oil recovery, keep the equipment clean, reduce maintenance costs, and improve operational reliability.

[0005] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a protective cover, including a cylindrical body, which is used to cover the piston rod of an injection molding machine, and the open end of the cylindrical body is used to connect with the oil cylinder cover of the injection molding machine. An oil discharge hole is provided through the peripheral wall of the cylindrical body, and a vent hole is provided on the bottom wall of the cylindrical body.

[0006] In an optional embodiment, the protective cover further includes a connecting ring, which is fixedly connected to the open end of the cylinder to achieve a detachable connection between the cylinder and the injection molding machine cylinder head.

[0007] In an optional embodiment, the inner peripheral wall of the connecting ring is welded to the outer peripheral wall of the cylinder.

[0008] In an optional embodiment, the connecting ring is provided with at least two positioning holes spaced apart along its circumference. The positioning holes are used to engage with fasteners to achieve a detachable connection between the connecting ring and the cylinder cover of the injection molding machine.

[0009] In an optional embodiment, the protective cover also includes a seal, and the inner peripheral wall of the connecting ring is provided with a sealing groove that mates with the seal.

[0010] In an optional embodiment, the protective cover also includes an oil discharge column, one end of which is inserted into and communicates with the oil discharge hole.

[0011] In an optional embodiment, the edge of the unloading hole protrudes outward to form a flange, and the inner wall of the flange is welded to the outer wall of the unloading column.

[0012] In an optional embodiment, the protective cover also includes a connecting pipe, one end of which is connected to the oil drain hole and the other end of which is connected to the oil tank.

[0013] In an optional implementation, the connecting pipe is a flexible hose.

[0014] Secondly, this utility model provides an injection molding machine, including a cylinder head, a piston rod extending through the cylinder head, and a protective cover as described in any of the foregoing embodiments; wherein, a cylindrical body is disposed on the piston rod, and the open end of the cylindrical body is connected to the cylinder head.

[0015] The beneficial effects of the protective cover and injection molding machine provided by this utility model embodiment include: This invention provides a protective cover and an injection molding machine. The protective cover includes a cylinder and a connecting pipe. The cylinder covers the piston rod of the injection molding machine, and its open end connects to the cylinder head. An oil drain hole is provided through the circumferential wall of the cylinder. This allows accumulated lubricating oil generated during piston rod movement to flow along the inner wall of the protective cover and drain through the drain hole, preventing oil buildup inside the cover and subsequent leakage. Furthermore, a vent is provided on the bottom wall of the cylinder to connect the inner cavity of the cylinder with the external environment, balancing internal and external air pressure and ensuring consistent pressure for smooth lubricating oil drainage. Therefore, the protective cover provided by this invention effectively solves the oil leakage problem of traditional enclosed protective covers, significantly improves equipment cleanliness and operational safety, reduces cleaning and maintenance frequency, and improves the cleanliness of the working environment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the protective cover and connecting ring provided in this embodiment; Figure 2 This is a partially enlarged schematic diagram of the protective cover provided in this embodiment in its installed state; Figure 3 This is a schematic diagram of the injection molding machine provided in this embodiment.

[0018] Icons: 010-Injection Molding Machine; 20-Cylinder Head; 21-Front Cover; 23-Rear Cover; 30-Piston Rod; 40-Piston; 50-Cylinder Barrel; 60-Injection Stand Front Plate; 70-Oil Tank; 10-Protective Cover; 100-Cylinder Body; 110-Oil Discharge Hole; 120-Flange; 130-Ventilation Hole; 300-Connecting Ring; 310-Positioning Hole; 330-Sealing Groove; 400-Seal; 500-Oil Discharge Column; 700-Connecting Pipe. Detailed Implementation

[0019] Under long-term high-frequency operation, lubricating oil will form an oil film on the piston rod surface and accumulate in the inner lip of the dust seal. Eventually, it will seep out of the protective cover and drip down, causing equipment damage, environmental pollution, and increasing the workload of cleaning and maintenance.

[0020] To address the aforementioned problems, this utility model provides a protective cover and injection molding machine that can effectively prevent external oil leakage, achieve oil recovery, keep the equipment clean, reduce maintenance costs, and improve operational reliability.

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not 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.

[0025] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0026] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0027] The following describes in detail the overall structure, working principle, and technical effects of the protective cover and injection molding machine provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0028] Please see Figure 1 and Figure 2 This utility model provides a protective cover 10, which can effectively prevent external oil leakage, realize oil recovery, keep equipment clean, reduce maintenance costs, and improve operational reliability. The protective cover 10 includes a cylinder 100 and a connecting pipe 700.

[0029] The cylinder 100 is used to cover the piston rod 30 of the injection molding machine 010, and the open end of the cylinder 100 is used to connect with the oil cylinder cover 20 of the injection molding machine 010. An oil discharge hole 110 is provided through the peripheral wall of the cylinder 100. Based on this, the accumulated lubricating oil generated during the movement of the piston rod 30 can flow along the inner wall of the protective cover 10 and be discharged through the oil discharge hole 110, thereby avoiding the seepage and dripping caused by the accumulation of oil inside the protective cover 10.

[0030] Based on the above, a vent hole 130 is provided on the bottom wall of the cylinder 100. The vent hole 130 is used to connect the inner cavity of the cylinder 100 with the external environment to balance the internal and external air pressure, ensure consistent pressure, and thus ensure the smooth discharge of lubricating oil. Optionally, there may be multiple vent holes 130.

[0031] Therefore, the protective cover 10 provided by this utility model effectively solves the oil leakage problem of traditional closed protective covers, significantly improves the cleanliness and operational safety of the equipment, reduces the frequency of cleaning and maintenance, and improves the cleanliness of the working environment.

[0032] To facilitate the assembly and disassembly of the protective cover 10 and the cylinder head 20, thereby improving the convenience of daily maintenance, cleaning and replacement of the equipment, the protective cover 10 also includes a connecting ring 300, which is fixedly connected to the open end of the cylinder 100 to realize the detachable connection between the cylinder 100 and the cylinder head 20 of the injection molding machine 010.

[0033] Furthermore, the inner peripheral wall of the connecting ring 300 is welded to the outer peripheral wall of the cylinder 100. Specifically, mature welding processes such as argon arc welding, laser welding, or resistance welding can be used to form a continuous and dense weld at the joint between the connecting ring 300 and the cylinder 100, thereby achieving a high-strength and high-sealing connection between the two. In addition, in another embodiment, the connecting ring 300 and the cylinder 100 can also be manufactured using an integral molding process.

[0034] Furthermore, the connecting ring 300 is provided with at least two positioning holes 310 spaced apart along its circumference. The positioning holes 310 are used to cooperate with fasteners (such as bolts, screws, etc.) to realize the detachable connection between the connecting ring 300 and the cylinder cover 20 of the injection molding machine 010.

[0035] During actual assembly, operators can install and fix the protective cover 10 by sequentially passing fasteners through the positioning holes 310 and screwing them into the corresponding threaded holes on the cylinder cover 20. Furthermore, the multiple positioning holes 310 are evenly distributed circumferentially along the connecting ring 300, resulting in more balanced force distribution during the connection process and effectively preventing deformation or loosening caused by localized stress concentration.

[0036] In this embodiment, in order to effectively prevent lubricating oil from leaking from the connection interface between the protective cover 10 and the cylinder cover 20 of the injection molding machine 010 and improve the overall sealing performance, the protective cover 10 also includes a sealing element 400, and the inner peripheral wall of the connecting ring 300 is also provided with a sealing groove 330 that cooperates with the sealing element 400.

[0037] During assembly, a suitable amount of lubricating grease can be applied to the surface of the seal 400 before embedding it into the sealing groove 330 to achieve installation and positioning. Subsequently, when the protective cover 10 is installed onto the cylinder head 20 of the injection molding machine 010 via the connecting ring 300, the seal 400 is located between the contact interface of the connecting ring 300 and the cylinder head 20. Under the clamping force applied by the fastener, it undergoes moderate deformation and tightly fits against the mating surface between the two, thereby achieving a static seal.

[0038] Alternatively, the seal 400 is typically made of an elastic material, such as nitrile rubber (NBR), fluororubber (FKM), or silicone rubber (VMQ), which has good resilience, oil resistance, and anti-aging properties.

[0039] Please refer to it again. Figure 2 The protective cover 10 also includes a connecting pipe 700. One end of the connecting pipe 700 is connected to the oil discharge hole 110, and the other end is used to connect to the oil tank 70, thereby forming a complete oil return channel to realize the effective export and recycling of lubricating oil accumulated inside the protective cover 10, and avoid oil leakage causing equipment pollution and resource waste.

[0040] Furthermore, the connecting pipe 700 is a flexible hose, which can be made of materials with flexibility, oil resistance and a certain pressure resistance, such as oil-resistant rubber hose, silicone hose or composite hose with steel wire reinforcement.

[0041] On the one hand, during the operation of the injection molding machine 010, the elastic deformation capability of the hose can effectively absorb dynamic stress and avoid pipeline fatigue fracture caused by rigid connection; on the other hand, the hose has good bending performance and spatial adaptability, and its direction can be adjusted according to actual installation needs.

[0042] Furthermore, the protective cover 10 also includes an oil discharge column 500, one end of which is inserted into and communicates with the oil discharge hole 110 to guide the lubricating oil accumulated inside the protective cover 10 to the outside. Specifically, the oil discharge column 500 serves as a transition interface for oil flow, with one end extending into the oil discharge hole 110 and achieving a sealed connection, while the other end is used to connect with an external oil guiding component (such as the hose in the aforementioned embodiment). Optionally, the inner diameter of the oil discharge column 500 matches the outer diameter of the connecting pipe 700 for easy and quick insertion.

[0043] In actual assembly, the unloading column 500 can be fixed to the unloading hole 110 through interference fit, welding, threaded connection, or snap-fit ​​structure to ensure a stable and leak-free connection. In the embodiment using a welded connection, to enhance the connection strength of the welded part, the edge of the unloading hole 110 protrudes outward to form a flange 120. The inner wall of the flange 120 is welded to the outer wall of the unloading column 500, thereby increasing the wall thickness and structural rigidity of the connection area and improving the mechanical strength of the connection.

[0044] Furthermore, the extension direction of the flange 120 can be designed according to the actual pipe laying requirements, such as extending radially or obliquely from the outer peripheral wall of the cylinder 100, which facilitates guiding the connection pipe 700 to a reasonable direction, avoids interference with other mechanical components, and improves installation adaptability and space utilization.

[0045] In summary, this utility model provides a protective cover 10, which includes a cylindrical body 100 and a connecting pipe 700. The cylindrical body 100 is used to cover the piston rod 30 of the injection molding machine 010, and the open end of the cylindrical body 100 is used to connect to the oil cylinder cover 20 of the injection molding machine 010. An oil drain hole 110 is provided through the peripheral wall of the cylindrical body 100. Based on this, the accumulated lubricating oil generated during the movement of the piston rod 30 can flow along the inner wall of the protective cover 10 and be discharged through the oil drain hole 110, thereby preventing oil accumulation inside the protective cover 10 and subsequent seepage and dripping. Furthermore, a vent hole 130 is provided on the bottom wall of the cylindrical body 100. The vent hole 130 connects the inner cavity of the cylindrical body 100 with the external environment to balance the internal and external air pressure, ensuring consistent pressure and thus guaranteeing smooth discharge of lubricating oil. Therefore, the protective cover 10 provided by this utility model effectively solves the oil leakage problem of traditional closed protective covers, significantly improves the cleanliness and operational safety of the equipment, reduces the frequency of cleaning and maintenance, and improves the cleanliness of the working environment.

[0046] In addition, please see Figure 3 This utility model also provides an injection molding machine 010, a cylinder head 20, a piston rod 30 extending through the cylinder head 20, and a protective cover 10 of any of the aforementioned embodiments. The cylinder body 100 covers the piston rod 30, and the open end of the cylinder body 100 is connected to the cylinder head 20.

[0047] Because it includes the protective cover 10 in the aforementioned embodiments, it can also achieve efficient drainage of lubricating oil, effectively preventing external leakage caused by oil accumulation inside the dust seal lip. This significantly improves the cleanliness and operational safety of the equipment, reduces oil dripping, lowers the frequency of daily cleaning and maintenance, and improves the cleanliness of the working environment at the production site. The relevant technical effects have been detailed above and will not be repeated here.

[0048] Optionally, the injection molding machine 010 may also include the oil tank 70 described in the foregoing embodiments. The other end of the connecting pipe 700 is connected to the oil tank 70, forming a complete lubricating oil return circulation system. In this embodiment, the lubricating oil discharged from inside the protective cover 10 automatically flows back to the oil tank 70 of the injection molding machine 010 via the connecting pipe 700, realizing the collection and reuse of oil. In another embodiment, the oil tank 70 may also be an external oil storage device independent of the injection molding machine 010 body. In this case, the connecting pipe 700 extends to the outside of the equipment and connects to the external oil tank 70.

[0049] Furthermore, please refer again. Figure 3In this embodiment, the injection molding machine 010 includes a cylinder barrel 50, a front injection plate 60, a piston 40, and two cylinder covers 20. These two cylinder covers 20 are defined as the front cover 21 and the rear cover 23, respectively. The cylinder barrel 50 is embedded in the central hole of the front injection plate 60. The front cover 21 and the rear cover 23 are fixedly connected to the two end faces of the front injection plate 60 by screws, thus forming a closed cylinder cavity. The piston 40 and the piston rod 30 are connected as one unit by threads. The piston 40 is installed inside the cylinder barrel 50. The left piston rod 30 extends through the rear cover 23, and the right piston rod 30 extends through the front cover 21, achieving bidirectional motion output.

[0050] During operation, when hydraulic oil enters from the inlet of the rear cover 23, the pressure acts on the left end face of the piston 40, pushing the piston 40 and piston rod 30 to move to the right. At this time, the oil chamber on the side of the front cover 21 is in the return state, and the oil is discharged through the oil port of the front cover 21. Conversely, when hydraulic oil enters from the inlet of the front cover 21, the pressure acts on the right end face of the piston 40, and the piston 40 and piston rod 30 move to the left. The oil chamber on the side of the rear cover 23 returns, and the oil is discharged through the oil port of the rear cover 23.

[0051] Therefore, the cylindrical body 100 of the protective cover 10 provided by this utility model is sleeved on the left end of the piston rod 30 (i.e., the side that protrudes from the rear cover 23), and the open end of the cylindrical body 100 is connected to the rear cover 23, so that the cylindrical body 100 covers the outer periphery of the piston rod 30, forming a sealed protective structure. The lubricating oil accumulated at the inner lip of the dust seal can flow along the inner wall of the cylindrical body 100, be discharged through the oil discharge hole 110 on the peripheral wall of the cylindrical body 100, and be guided to the oil tank 70 through the connecting pipe 700, realizing the recovery and reuse of oil.

[0052] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A protective cover, characterized in that, Includes a cylinder (100), which is used to cover the piston rod (30) of the injection molding machine (010), and the open end of the cylinder (100) is used to connect with the cylinder cover (20) of the injection molding machine (010). The peripheral wall of the cylinder (100) is provided with an oil discharge hole (110), and the bottom wall of the cylinder (100) is provided with a vent hole (130).

2. The protective cover according to claim 1, characterized in that, The protective cover (10) also includes a connecting ring (300), which is fixedly connected to the open end of the cylinder (100) to realize a detachable connection between the cylinder (100) and the cylinder cover (20) of the injection molding machine (010).

3. The protective cover according to claim 2, characterized in that, The inner peripheral wall of the connecting ring (300) is welded to the outer peripheral wall of the cylinder (100).

4. The protective cover according to claim 2, characterized in that, The connecting ring (300) is provided with at least two positioning holes (310) spaced apart along its circumference. The positioning holes (310) are used to cooperate with fasteners to realize the detachable connection between the connecting ring (300) and the cylinder cover (20) of the injection molding machine (010).

5. The protective cover according to claim 2, characterized in that, The protective cover (10) also includes a sealing element (400), and the inner peripheral wall of the connecting ring (300) is provided with a sealing groove (330) that cooperates with the sealing element (400).

6. The protective cover according to any one of claims 1 to 5, characterized in that, The protective cover (10) also includes an oil unloading column (500), one end of which is inserted into and communicates with the oil unloading hole (110).

7. The protective cover according to claim 6, characterized in that, The edge of the unloading hole (110) protrudes outward to form a flange (120), and the inner wall of the flange (120) is welded to the outer wall of the unloading column (500).

8. The protective cover according to any one of claims 1 to 5, characterized in that, The protective cover (10) also includes a connecting pipe (700), one end of which is connected to the oil discharge hole (110), and the other end is used to connect to the oil tank (70).

9. The protective cover according to claim 8, characterized in that, The connecting pipe (700) is a flexible hose.

10. An injection molding machine (010), characterized in that, It includes a cylinder head (20), a piston rod (30) extending through the cylinder head (20), and a protective cover as described in any one of claims 1 to 9; wherein a cylinder (100) covers the piston rod (30), and the open end of the cylinder (100) is connected to the cylinder head (20).

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