Hydraulic expansion and contraction type cutter grinding shaft

Abstract

The utility model provides a hydraulic expansion type knife sharpening shaft which comprises a core shaft, two annular protruding shoulders are arranged on the periphery of the core shaft in the length direction of the core shaft, the two annular protruding shoulders and a shaft section, located between the two annular protruding shoulders, of the core shaft form an annular groove, an expansion sleeve is installed on the core shaft, and the expansion sleeve is connected with the core shaft in a sleeved mode. The inner walls of the two ends of the expansion sleeve are welded to the peripheries of the two annular protruding shoulders respectively, at least one liquid drainage hole transversely penetrating through the mandrel is formed in the annular groove, a liquid inlet hole communicated with the liquid drainage hole is formed in the end portion of one end of the mandrel, and a liquid drainage hole communicated with the liquid drainage hole is formed in the end portion of the other end of the mandrel. The device is reasonable in design, the cutter shaft outer sleeve is expanded in the mode that hydraulic oil is injected into the inner cavity, expansion fit between the inner hole of the cutter ring or the blade and the outer circle of the cutter shaft is achieved, it is guaranteed that the outer circle grinding precision of the blade of the cutter ring is within 0.005 mm, and then the edge cutting quality of aluminum thin materials is guaranteed.

Description

Technical Field

[0001] The utility model relates to a hydraulic expansion and contraction type grinding shaft. Background Art

[0002] In the aluminum processing industry, circular shears are commonly used for trimming the edges of coils. After long-term use, the cutting edges of the cutter rings and blades on the circular shear equipment are worn and the rubber is damaged. Therefore, they need to be disassembled for external cylindrical grinding. Currently, the grinding method commonly used in our company is carried out on a machine tool. Each set of circular knives uses 4 blades and 4 sets of cutter rings. To improve the grinding efficiency, a grinding shaft with relatively high precision needs to be equipped as a clamping and positioning tool for the cutter rings and blades, so as to ensure the grinding precision and grinding efficiency of the cutter rings and blades. However, the existing grinding shaft can only guarantee a grinding precision of 0.03 mm. With the increase in orders for thin material products, the existing grinding precision of the blades and cutter rings cannot guarantee the trimming quality. Therefore, a new high-precision grinding shaft is designed to improve the grinding precision of the cutter rings and the grinding shaft, and thus ensure the trimming quality of the products. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art and provide a hydraulic expansion and contraction type grinding shaft, which is reasonably designed. By injecting hydraulic oil into the inner cavity, the outer sleeve of the grinding shaft is expanded, so as to realize the tight fit between the inner hole of the cutter ring or blade and the outer circle of the grinding shaft, ensure that the outer circle grinding precision of the cutter ring and the blade is within 0.005 mm, and thus ensure the trimming quality of thin aluminum materials.

[0004] The utility model is realized by the following scheme: A hydraulic expansion and contraction type grinding shaft: includes a core shaft. Along the length direction of the core shaft, two annular shoulders are arranged on the outer periphery of the core shaft. The two annular shoulders and the shaft section of the core shaft between the two annular shoulders form an annular groove. A expansion sleeve is installed on the core shaft. The inner walls at both ends of the expansion sleeve are respectively welded to the outer peripheries of the two annular shoulders. At least one drainage hole penetrating the core shaft horizontally is opened on the annular groove. A liquid inlet hole communicating with the drainage hole is opened at one end of the core shaft. A drainage hole communicating with the drainage hole is opened at one end of the core shaft.

[0005] Further, the expansion sleeve includes a sleeve. An annular limiting shoulder is arranged on the outer periphery at one end of the sleeve. The inner walls at both ends of the sleeve are respectively welded to the outer peripheries of the two annular shoulders.

[0006] Further, the length of the sleeve is equal to the distance between the two annular shoulders close to the same side of the end of the core shaft.

[0007] Further, an annular nut installation shoulder is arranged on the core shaft outside the annular shoulder on the side far from the annular limiting shoulder. The diameter of the annular nut installation shoulder is larger than that of the annular shoulder. A step surface for the expansion sleeve to abut against is formed between the annular nut installation shoulder and the annular shoulder.

[0008] Further, an external thread is provided on the outer periphery of the annular nut mounting shoulder.

[0009] Further, a high-pressure oil nozzle with a switch is installed at the input end of the liquid inlet hole.

[0010] Further, the liquid discharge hole is a three-stage stepped hole, and the diameters of the three hole segments of the liquid discharge hole gradually decrease from the end of the mandrel towards the liquid discharge hole.

[0011] Further, the maximum diameter hole segment of the liquid discharge hole is a threaded hole, and a stud is screwed into the threaded hole.

[0012] Further, a pressure relief hole communicating with the middle hole segment of the liquid discharge hole is provided on the side of the mandrel, and a plug block for plugging the pressure relief hole and cooperating with the liquid discharge hole is slidably connected inside the shaft segment in the middle of the liquid discharge hole.

[0013] Compared with the prior art, the present utility model has the following beneficial effects: It is reasonably designed. By injecting hydraulic oil into the inner cavity to expand the outer sleeve of the tool shaft, a tight fit is achieved between the inner hole of the tool ring or blade and the outer circle of the tool shaft, ensuring that the outer circle grinding accuracy of the blade of the tool ring is within 0.005 mm, thereby guaranteeing the trimming quality of thin aluminum materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 is a schematic diagram of the use state of the present utility model;

[0016] Figure 3 is a schematic diagram of the connection structure of the pressure relief hole, the plug block, and the liquid discharge hole of the present utility model (sealing bead);

[0017] Figure 4 is a schematic diagram of the connection structure of the pressure relief hole, the plug block, and the liquid discharge hole of the present utility model (cylindrical block).

[0018] In the figure: 1 - mandrel; 2 - annular shoulder; 3 - expansion sleeve; 4 - liquid discharge hole; 5 - liquid inlet hole; 6 - liquid discharge hole; 7 - liquid cavity; 8 - disc cutter; 9 - sleeve; 10 - annular limiting shoulder; 11 - annular nut mounting shoulder; 12 - mounting nut; 13 - high-pressure oil nozzle; 14 - threaded hole; 15 - stud; 16 - pressure relief hole; 17 - plug block; 18 - welding joint. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following further describes the present utility model in conjunction with the drawings and embodiments.

[0020] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] As Figures 1-4 shown, a hydraulic expansion and contraction type grinding shaft for knives: includes a mandrel 1. Along the length direction of the mandrel, two annular shoulders 2 are provided on the outer periphery of the mandrel. The two annular shoulders and the shaft section of the mandrel between the two annular shoulders form an annular groove. A sleeve 3 is installed on the mandrel. The inner walls of both ends of the sleeve are respectively welded to the outer peripheries of the two annular shoulders. At least one drain hole 4 penetrating the mandrel horizontally is provided on the annular groove. A liquid inlet hole 5 communicating with the drain hole is provided at one end of the mandrel. A drain hole 6 communicating with the drain hole is provided at one end of the mandrel. The annular groove and the sleeve enclose an annular liquid cavity 7. When in use, a disc cutter 8 is sleeved on the sleeve, and both ends of the disc cutter are fixed. The hydraulic oil input from the liquid inlet hole enters the liquid cavity through the drain hole, pushing the sleeve outwards, realizing the tight fit between the sleeve and the inner hole of the cutter ring or blade, ensuring that the outer circle grinding accuracy of the cutter ring and the blade is within 0.005 mm, and further ensuring the trimming quality of thin aluminum materials.

[0023] In this embodiment, the sleeve includes a sleeve 9. An annular limiting shoulder 10 is provided on the outer periphery of one end of the sleeve. The inner walls of both ends of the sleeve are respectively welded to the outer peripheries of the two annular shoulders, so that the annular groove and the sleeve enclose an annular liquid cavity. More specifically, the length of the sleeve is equal to the distance between the two annular shoulders close to the same side of the mandrel end, that is, the length of the sleeve = the distance between the two annular shoulders + the thickness of the two annular shoulders, so that the sleeve just covers the two annular shoulders and the area between the two annular shoulders, and at the same time, the connection edges are completely sealed by welding to prevent hydraulic oil from leaking out.

[0024] In this embodiment, an annular nut mounting shoulder 11 is provided outside the annular shoulder on the side of the mandrel away from the annular limiting shoulder. The diameter of the annular nut mounting shoulder is larger than that of the annular shoulder. A stepped surface for the expansion sleeve to abut against is formed between the annular nut mounting shoulder and the annular shoulder. The stepped surface can achieve the rapid positioning of the expansion sleeve during installation. At the same time, an external thread is provided on the outer periphery of the annular nut mounting shoulder, and a mounting nut 12 is screwed through the external thread. When installing the disc cutter, the circular hole of the disc cutter is sleeved from one side of the annular nut mounting shoulder onto the expansion sleeve until the disc surface of the disc cutter abuts against the annular limiting shoulder, and then the disc cutter is locked by the mounting nut to achieve the axial positioning of the disc cutter.

[0025] In this embodiment, a high-pressure oil nozzle 13 with a switch is installed at the input end of the liquid inlet hole. The high-pressure oil nozzle is a prior art, so it will not be elaborated here. The external hydraulic oil tank injects hydraulic oil into the liquid inlet hole through the high-pressure oil nozzle.

[0026] In this embodiment, the liquid discharge hole is a three-stage stepped hole, and the diameters of the three hole segments of the liquid discharge hole decrease sequentially from the end of the mandrel towards the liquid discharge hole direction. More specifically, the largest diameter hole segment of the liquid discharge hole is a threaded hole, that is, the hole end of the liquid discharge hole connected to the end of the mandrel is a threaded hole 14, and a stud 15 is screwed in the threaded hole to close the liquid discharge hole.

[0027] In this embodiment, a pressure relief hole 16 communicating with the middle hole segment of the liquid discharge hole is provided on the side of the mandrel, that is, the pressure relief hole communicates with the middle diameter hole segment. A plug block 17 that cooperates with the liquid discharge hole and is used to block the pressure relief hole is slidably connected inside the shaft segment in the middle of the liquid discharge hole. The plug block can be a plug bead. At this time, the diameter of the middle hole segment of the liquid discharge hole is adapted to the diameter of the plug bead. At the same time, the length of the middle hole segment of the liquid discharge hole is not less than the diameter of the plug bead. At the same time, the connection position of the pressure relief hole should be on the shaft segment in the middle of the liquid discharge hole at a distance of 1 / 2 the diameter of the plug bead from the connection between the threaded hole and the middle hole segment of the liquid discharge hole. Of course, the plug block can also be a cylindrical block, and the cylindrical block is slidably connected inside the middle diameter hole segment. The connection position of the pressure relief hole should be on the shaft segment in the middle of the liquid discharge hole at a distance of the length of the cylindrical block from the connection between the threaded hole and the middle hole segment of the liquid discharge hole. When pressure relief is required, by screwing out the stud, the plug block gradually slides out of the middle hole segment of the liquid discharge hole under the action of hydraulic pressure until the pressure relief hole is exposed to achieve the pressure relief of the hydraulic oil, and the connection between the expansion sleeve and the disc cutter can be loosened, and the waste oil can be collected and filtered for use.

[0028] If terms such as "first" and "second" are used in this article to limit components, those skilled in the art should be aware that the use of "first" and "second" is only for the convenience of differentiating components in the description. Without additional declaration, the above terms have no special meaning.

[0029] If the utility model discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), or it can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integral structure (for example, manufactured by integral casting) (except when the integral forming process is obviously not applicable).

[0030] In addition, for any technical solution disclosed in the above utility model, the orientation or positional relationship indicated by terms used to represent positional relationships such as "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this patent, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this patent. And for any technical solution disclosed in the above utility model, the terms used to represent shapes, unless otherwise stated, include shapes that are approximate, similar or close to it.

[0031] Any component provided by the utility model can either be assembled from a plurality of separate components or be a single component manufactured by an integral forming process.

[0032] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them; although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the utility model or make equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the utility model, they should all be covered within the scope of the technical solutions claimed by the utility model.

Claims

1. A hydraulic expansion and contraction type knife grinding shaft, characterized in that: It includes a mandrel. On the outer periphery of the mandrel, two annular shoulders are arranged along the length direction of the mandrel. The two annular shoulders and the shaft section of the mandrel between the two annular shoulders form an annular groove. A expansion sleeve is installed on the mandrel. The inner walls at both ends of the expansion sleeve are respectively welded to the outer peripheries of the two annular shoulders. At least one drain hole penetrating the mandrel horizontally is opened on the annular groove. A liquid inlet hole communicating with the drain hole is opened at one end of the mandrel, and a drain hole communicating with the drain hole is opened at one end of the mandrel.

2. The hydraulic expansion and contraction type knife grinding shaft according to claim 1, characterized in that; The expansion sleeve includes a sleeve. An annular limiting shoulder is arranged on the outer periphery of one end of the sleeve. The inner walls at both ends of the sleeve are respectively welded to the outer peripheries of the two annular shoulders.

3. The hydraulic expansion and contraction type knife grinding shaft according to claim 2, characterized in that; The length of the sleeve is equal to the distance between the two annular shoulders close to the same side of the mandrel end.

4. The hydraulic expansion and contraction type knife grinding shaft according to claim 2, characterized in that; An annular nut mounting shoulder is arranged on the outer side of the annular shoulder on the mandrel away from the annular limiting shoulder. The diameter of the annular nut mounting shoulder is larger than that of the annular shoulder. A step surface for the expansion sleeve to abut against is formed between the annular nut mounting shoulder and the annular shoulder.

5. The hydraulic expansion and contraction type knife grinding shaft according to claim 4, characterized in that ; An external thread is arranged on the outer periphery of the annular nut mounting shoulder.

6. The hydraulic expansion and contraction type knife grinding shaft according to claim 1, characterized in that; A high-pressure oil nozzle with a switch is installed at the input end of the liquid inlet hole.

7. The hydraulic expansion and contraction type knife grinding shaft according to claim 1, characterized in that; The drain hole is a three-stage stepped hole, and the diameters of the three hole sections of the drain hole gradually decrease from the mandrel end to the drain hole direction.

8. The hydraulic expansion and contraction type knife grinding shaft according to claim 7, characterized in that; The maximum diameter hole section of the drain hole is a threaded hole, and a stud is screwed in the threaded hole.

9. The hydraulic expansion and contraction type knife grinding shaft according to claim 8, characterized in that; A pressure relief hole communicating with the middle hole section of the drain hole is opened on the side of the mandrel. A plug block for plugging the pressure relief hole and matching with the drain hole is slidably connected in the shaft section in the middle of the drain hole.

Images