Electric spark immersion rotary sealing mechanism and electric spark forming machine tool

Abstract

The utility model provides an electric spark immersion liquid rotary sealing mechanism which comprises a rack, a rotary workbench and a rotary sealing assembly, the bottom of the rotary workbench is provided with an annular sealing groove and a baffle ring, and a gap used for preventing particles from entering and discharging spark liquid and impurities is formed between the baffle ring and the rack; the rotary sealing assembly comprises a framework sealing ring and a framework contact support. The framework sealing ring is hung upside down in the sealing groove, and an opening of the framework sealing ring faces downwards. The framework contact support extends upwards to enter the sealing groove to be in clearance fit with the sealing groove, and an oil seal space is formed by a cavity among the rack, the rotary workbench, the framework sealing ring, the framework contact support and the baffle ring. According to the scheme, it is guaranteed that spark liquid sealed by the oil seal in the electric spark immersion liquid rotary sealing mechanism is clean, excessive abrasion to the framework sealing ring and the framework contact support is avoided, and the framework sealing ring and the framework contact support are convenient and rapid to replace and low in cost. The utility model further relates to an electric spark forming machine tool.

Description

Technical Field

[0001] The utility model relates to the technical field of tooling fixtures, in particular to an electric spark immersion rotary sealing mechanism and an electric spark forming processing machine tool. Background Art

[0002] Electrospark forming machining is mainly used for discharge machining of various difficult-to-machine materials or difficult-to-machine cavity parts. This requires that the electrode or the workpiece can achieve multi-axis translation or rotation. In electrospark machining, the machining working fluid plays an important role in electrospark machining. It can provide cooling, cleaning and lubrication effects to ensure the stability and efficiency of the machining process. Compared with flushing machining, immersion machining has better cooling and cleaning effects and is the main method of electrospark machining. However, immersion machining requires the workpiece to be implemented in a closed container, and the workpiece requires multi-axis rotational motion, so the demand for rotary dynamic sealing mechanisms in electrospark equipment is very high.

[0003] However, in EDM machines, rotary seals are not widely used. This is mainly due to the following reasons:

[0004] 1. Since a lot of high-temperature alloy powder residue will appear during EDM, when the rotary dynamic seal is arranged on a horizontal workbench, these powder residues will gather on the oil seal lip, that is, at the contact point between the oil seal and the metal surface, which will cause wear of the oil seal lip and the metal surface in contact with it, reducing the life of the oil seal.

[0005] 2. It is troublesome to replace the damaged oil seal. The oil seal and the metal parts in contact with the oil seal need to be replaced together. The replacement time is long and the cost is high.

[0006] 3. The permeability of the EDM working fluid is very strong, which places high demands on the wear resistance of the oil seal and the materials in contact with the oil seal.

[0007] The above reasons lead to the short service life of ordinary dynamic sealing mechanisms on EDM machines, which results in the fact that the rotary sealing mechanisms are not widely used.

[0008] In view of this, how to solve the problems of short oil seal life, troublesome replacement, high wear resistance requirements, etc. in the existing rotary dynamic seal structure of the above-mentioned EDM machine tool has become the research content of this topic. Utility Model Content

[0009] The utility model provides an electric spark immersion rotary sealing mechanism and an electric spark forming processing machine tool.

[0010] To achieve the above-mentioned purpose, in the first aspect, the technical solution adopted by the utility model is: an electric spark immersion rotary sealing mechanism, including a frame, a rotary worktable and a rotary sealing assembly, and its innovative points are:

[0011] An annular sealing groove is provided at the bottom of the rotary worktable, and an annular retaining ring extending downward is provided at the bottom of the rotary worktable outside the circumference of the sealing groove, and a gap is formed between the retaining ring and the frame for preventing particles from entering and for discharging spark liquid and impurities;

[0012] The rotary seal assembly comprises a skeleton sealing ring and a skeleton contact bracket. The skeleton sealing ring is an annular structure with an open opening. The skeleton sealing ring is hung upside down in the sealing groove with the opening facing downward. The skeleton contact bracket is detachably mounted on the frame. The skeleton contact bracket extends upward into the sealing groove to match the gap of the sealing groove, and the outer side of the skeleton contact bracket matches the inner side of the skeleton sealing ring.

[0013] The rotary sealing mechanism is configured as follows: an oil seal space is formed by the frame, the rotary worktable, the skeleton sealing ring, the skeleton contact bracket, and the cavity between the baffle ring; an oil filling device connected to the oil seal space is provided on the frame, and spark liquid and impurities are discharged from the gap between the baffle ring and the frame.

[0014] To achieve the above-mentioned purpose, in a second aspect, the technical solution adopted by the present invention is: an electrospark forming machine tool, wherein the electrospark forming machine tool uses an electrospark immersion rotary sealing mechanism described in the first aspect of the present invention.

[0015] The relevant contents in the above technical solution are explained as follows:

[0016] 1. In the present invention, in view of the problems of short oil seal life, troublesome replacement, high wear resistance requirements, etc. existing in the rotary dynamic seal structure of the EDM machine tool, a new type of EDM liquid immersion rotary seal mechanism and an EDM forming machine tool using the same are designed. In the rotary seal mechanism, a retaining ring is arranged at the bottom of the rotary table, and a gap is formed between the retaining ring and the frame, so that large particles can be prevented from entering the oil seal seal; the skeleton seal ring is placed in the seal groove of the rotary table in an upside-down manner, and the powder residue can be dropped downward by gravity. This structure can effectively prevent the powder residue from gathering at the lip and avoid excessive wear on the skeleton seal ring and the skeleton contact bracket; the skeleton contact bracket is designed to be detachably installed on the frame, because the skeleton contact bracket is connected to the rotating skeleton The arrangement of the frame sealing ring contact, the skeleton contact bracket is a single independent part, this part is finely ground after quenching treatment, which can effectively extend the life of the rotating sealing mechanism. In addition, when the oil seal is worn, this structure can be used to replace the skeleton contact bracket when the skeleton sealing ring needs to be replaced, thereby reducing the replacement cost and time; due to the gap design between the retaining ring and the frame and the inverted design of the skeleton sealing ring, the cavity between the frame, the rotating worktable and the skeleton sealing ring, the skeleton contact bracket, and the retaining ring forms an oil seal space, and clean spark liquid can be injected into the oil seal space through the oil filling device. These spark liquids will overflow from the narrow gap between the retaining ring of the rotating worktable and the frame, ensuring that the spark liquid sealed by the oil seal is clean, even if a small amount of impurities penetrate, they will be discharged from the gap. The above structural setting ensures that the spark liquid sealed by the oil seal in the electric spark immersion rotating sealing mechanism is clean, avoiding excessive wear of the skeleton sealing ring and the skeleton contact bracket, and the replacement of the skeleton sealing ring and the skeleton contact bracket is convenient, fast and low-cost.

[0017] 2. In the above solution, the sealing groove is provided with a first step portion and a second step portion, the first step portion is used to accommodate the skeleton contact bracket, the second step portion is used to accommodate the skeleton sealing ring, and the depth of the first step portion is greater than the depth of the second step portion. With this design, while ensuring that the skeleton contact bracket can provide sufficient contact support for the inner ring of the skeleton sealing ring, the gap between the skeleton contact bracket and the rotating worktable is prevented from being too small, thereby better assembly.

[0018] 3. In the above solution, the skeleton contact bracket is made of 40cr alloy steel or 45 carbon steel, and the skeleton contact bracket is a single independent part, which is finely ground after quenching treatment, which can effectively extend the life of the rotary sealing mechanism.

[0019] 4. In the above technical solution, an annular fixing plate is provided at the bottom of the rotary table at the position from the retaining ring to the sealing groove. The annular fixing plate is fastened to the rotary table by screws, and the annular fixing plate supports the outer bottom of the skeleton sealing ring, thereby ensuring the firmness and stability of the oil seal structure and facilitating disassembly and assembly.

[0020] 5. In the above technical solution, a mounting groove is provided on the frame at a position corresponding to the frame contact bracket, and an O-ring is provided between the frame and the frame contact bracket, so as to further improve the sealing performance of the rotary sealing mechanism.

[0021] 6. In the above technical solution, the size of the gap ranges from 0.5 to 1 mm, so as to ensure that large particles can be prevented from entering the oil seal while allowing a small amount of impurities such as small particles to penetrate and be discharged from the gap.

[0022] 7. In this utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] 8. In the present utility model, the orientation or position relationship indicated by the terms "center", "upper", "lower", "axial", "bottom", "inner", "outer", etc. is based on the orientation or position assembly relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0024] 9. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0025] Due to the application of the above scheme, the utility model has the following advantages and effects compared with the prior art:

[0026] 1. In the above scheme of the utility model, a retaining ring is arranged at the bottom of the rotating worktable, and a gap is formed between the retaining ring and the frame, so as to prevent large particles from entering the oil seal; wherein the skeleton sealing ring is placed in the sealing groove of the rotating worktable in an upside-down manner, and the powder residue can fall downward by gravity. This structure can effectively prevent the powder residue from gathering at the lip and avoid excessive wear on the skeleton sealing ring and the skeleton contact bracket.

[0027] 2. In the above scheme of the utility model, the skeleton contact bracket is designed to be detachably installed on the frame. Since the skeleton contact bracket is arranged to contact the rotating skeleton sealing ring, the skeleton contact bracket is a single independent part. This part is finely ground after quenching, which can effectively extend the life of the rotating sealing mechanism. In addition, when the oil seal is worn, this structure can be used to replace the skeleton contact bracket when the skeleton sealing ring needs to be replaced, thereby reducing the replacement cost and time. Due to the gap design between the retaining ring and the frame and the inverted design of the skeleton sealing ring, an oil seal space is formed by the cavity between the frame, the rotating worktable, the skeleton sealing ring, the skeleton contact bracket, and the retaining ring. Clean spark liquid can be injected into the oil seal space through the oil filling device. The spark liquid will overflow from the narrow gap between the retaining ring of the rotating worktable and the frame to ensure that the spark liquid sealed by the oil seal is clean, and even if a small amount of impurities penetrate into it, they will be discharged from the gap.

[0028] 3. In summary, the utility model ensures that the spark liquid sealed by the oil seal in the electric spark immersion rotating sealing mechanism is clean due to the above structural arrangement, avoids excessive wear of the skeleton sealing ring and the skeleton contact bracket, and the replacement of the skeleton sealing ring and the skeleton contact bracket is convenient, fast and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of an electric spark immersion rotary sealing mechanism according to an embodiment of the utility model;

[0030] Figure 2 for Figure 1 A local enlarged schematic diagram in FIG.

[0031] Figure 3 It is a partial explosion schematic diagram of an embodiment of the utility model.

[0032] In the above attached figure:

[0033] 1 Rotary table

[0034] 10 Gap

[0035] 11 Sealing groove

[0036] 111 First step

[0037] 112 Second step

[0038] 12 retaining ring

[0039] 2 racks

[0040] 21 Mounting slot

[0041] 3. Skeleton seal ring

[0042] 31 Opening

[0043] 4 Skeleton contact bracket

[0044] 5 Oil injection device

[0045] 6 Ring fixing plate

[0046] 7 O-ring

[0047] 8 Rotating base

[0048] 9 Oil seal space. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0050] The utility model aims to solve the problems of short oil seal life, troublesome replacement and high wear resistance requirement in the existing rotary dynamic seal structure of the electric spark machine tool, and designs a novel electric spark immersion rotary seal mechanism and an electric spark forming machine tool using the same. The rotary seal mechanism is used to ensure that the spark liquid sealed by the oil seal in the electric spark immersion rotary seal mechanism is clean, avoid excessive wear of the skeleton sealing ring and the skeleton contact bracket, and require that the skeleton sealing ring and the skeleton contact bracket be replaced conveniently, quickly and at low cost.

[0051] The following describes it in detail with reference to specific embodiments.

[0052] refer to Figure 1 , Figure 2 , Figure 3As shown, the embodiment of the utility model proposes an electric spark immersion rotary sealing mechanism, including a frame 2, a rotary worktable 1 and a rotary sealing assembly, the bottom of the rotary worktable 1 is provided with an annular sealing groove 11, the bottom of the rotary worktable 1 is provided with an annular retaining ring 12 extending downward on the circumferential outer side of the sealing groove 11, and a gap 10 for blocking particles from entering and discharging spark liquid and impurities is formed between the retaining ring 12 and the frame 2; the rotary sealing assembly includes a skeleton sealing ring 3 and a skeleton contact bracket 4, the skeleton sealing ring 3 is an annular structure with an open opening 31, the skeleton sealing ring 3 is upside down in the sealing groove 11 and the opening 31 is arranged downward; the skeleton contact bracket 4 is detachably installed on the frame 2, the skeleton contact bracket 4 extends upward into the sealing groove 11 and is gap-matched with the sealing groove 11, and the outer side of the skeleton contact bracket 4 is matched with the inner side of the skeleton sealing ring 3.

[0053] The rotary sealing mechanism in the embodiment of the utility model is configured as follows: an oil sealing space 9 is formed by the frame 2, the rotary worktable 1, the skeleton sealing ring 3, the skeleton contact bracket 4, and the cavity between the retaining ring 12, and an oil filling device 5 connected to the oil sealing space 9 is provided on the frame 2.

[0054] The structural features of the above solutions of the utility model embodiment are described as follows:

[0055] 1. In the embodiment of the utility model, a retaining ring 12 is arranged at the bottom of the rotary worktable 1, and a gap 10 is formed between the retaining ring 12 and the frame 2, so as to prevent large particles from entering the oil seal.

[0056] 2. In the embodiment of the utility model, the skeleton sealing ring 3 is placed in an upside-down manner in the sealing groove 11 of the rotating worktable 1, and the powder residue can fall downward by gravity. This structure can effectively prevent the powder residue from gathering at the lip and avoid excessive wear on the skeleton sealing ring 3 and the skeleton contact bracket 4.

[0057] 3. In the embodiment of the utility model, the skeleton contact bracket 4 is designed to be detachably installed on the frame 2. Since the skeleton contact bracket 4 is arranged to contact the rotating skeleton sealing ring 3, the skeleton contact bracket 4 is a single independent part. This part is finely ground after quenching, which can effectively extend the life of the rotating sealing mechanism. In addition, when the oil seal is worn, this structure allows the skeleton contact bracket 4 to be replaced together with the skeleton sealing ring 3 when it is necessary to replace it, thereby reducing the replacement cost and time.

[0058] 4. In the embodiment of the utility model, due to the design of the gap 10 between the retaining ring 12 and the frame 2 and the inverted design of the skeleton sealing ring 3, an oil seal space 9 is formed by the frame 2, the rotating worktable 1 and the skeleton sealing ring 3, the skeleton contact bracket 4, and the cavity between the retaining ring 12. Clean spark liquid can be injected into the oil seal space 9 through the oil filling device 5. The spark liquid will overflow from the narrow gap 10 between the retaining ring of the rotating worktable 1 and the frame 2, ensuring that the spark liquid sealed by the oil seal is clean, and even if a small amount of impurities penetrate, they will be discharged from the gap 10.

[0059] In another embodiment of the utility model, the sealing groove 11 is provided with a first step portion 111 and a second step portion 112, the first step portion 111 is used to accommodate the skeleton contact bracket 4, the second step portion 112 is used to accommodate the skeleton sealing ring 3, and the depth of the first step portion 111 is greater than the depth of the second step portion 112. With this design, while ensuring that the skeleton contact bracket 4 can provide sufficient contact support for the inner ring of the skeleton sealing ring 3, the gap between the skeleton contact bracket 4 and the rotating worktable 1 is avoided to be too small, thereby better assembly.

[0060] In another embodiment of the utility model, an annular fixing plate 6 is provided at the bottom of the rotating worktable 1 at the position from the retaining ring 12 to the sealing groove 11. The annular fixing plate 6 is fastened to the rotating worktable 1 by screws. The annular fixing plate 6 supports the outer bottom of the skeleton sealing ring 3, thereby ensuring the firmness and stability of the oil seal structure and facilitating disassembly and assembly.

[0061] In the embodiment of the utility model, the skeleton contact bracket 4 is made of 40cr alloy steel or 45 carbon steel. The skeleton contact bracket 4 is a single independent part. This part is finely ground after quenching, which can effectively extend the life of the rotary sealing mechanism.

[0062] In the embodiment of the utility model, a mounting groove 21 is provided on the frame 2 at a position corresponding to the skeleton contact bracket 4, and an O-ring 7 is provided between the frame 2 and the skeleton contact bracket 4 to further improve the sealing performance of the rotary sealing mechanism.

[0063] In the embodiment of the utility model, the size of the gap 10 ranges from 0.5 to 1 mm, so as to ensure that large particles can be prevented from entering the oil seal while a small amount of impurities such as small particles can be discharged from the gap 10.

[0064] The solution of the utility model is described below with a specific detailed embodiment.

[0065] In the electric spark immersion rotary sealing mechanism proposed in this detailed embodiment, the rotary sealing mechanism includes a frame 2, a rotary table 1 and a rotary sealing assembly. The rotary table 1 is fixedly mounted on a rotary base 8, and the rotary base 8 drives the rotary table 1 to rotate. The rotary sealing assembly is installed between the frame 2 and the rotary table 1.

[0066] In this detailed embodiment, an annular sealing groove 11 is provided at the bottom of the rotating worktable 1, and the sealing groove 11 is provided with a first step portion 111 and a second step portion 112. The depth of the first step portion 111 is greater than the depth of the second step portion 112. The bottom of the rotating worktable 1 is provided with an annular baffle ring 12 extending downward on the circumferential outer side of the sealing groove 11. A gap 10 for blocking particles from entering and for discharging spark liquid and impurities is formed between the baffle ring 12 and the frame 2. The size range of the gap 10 is 0.5 to 1 mm, and is generally selected to be within 1 mm, such as 1 mm, 0.8 mm, 0.6 mm, etc.

[0067] In this detailed embodiment, the rotary sealing assembly includes a skeleton sealing ring 3 and a skeleton contact bracket 4. The skeleton sealing ring 3 is an annular structure with an open opening 31. The skeleton sealing ring 3 is upside down at the second step portion 112 in the sealing groove 11, and the opening 31 is arranged downward. The bottom of the rotating worktable 1 is provided with an annular fixing plate 6 at the position from the retaining ring 12 to the sealing groove 11. The annular fixing plate 6 is fastened to the rotating worktable 1 by screws, and the outer bottom of the skeleton sealing ring 3 is supported by the annular fixing plate 6. The skeleton contact bracket 4 is made of 40cr alloy steel or 45 carbon steel, and is an annular bracket. The skeleton contact bracket 4 is detachably mounted on the frame 2, and the skeleton contact bracket 4 extends upward into the first step portion 111 in the sealing groove 11 and is gap-matched with the sealing groove 11, and the outer side of the skeleton contact bracket 4 is matched with the inner side of the skeleton sealing ring 3. When the skeleton sealing ring 3 follows the selection of the rotating worktable 1, the skeleton sealing ring 3 and the skeleton contact bracket 4 themselves provide selective sealing; an installation groove 21 is set on the frame 2 at a position corresponding to the skeleton contact bracket 4, and an O-ring is set between the frame 2 and the skeleton contact bracket 4.

[0068] In this detailed embodiment, an oil seal space 9 is formed by the frame 2, the rotating worktable 1, the skeleton sealing ring 3, the skeleton contact bracket 4, and the cavity between the retaining ring 12. An oil filling device 5 connected to the oil seal space 9 is provided on the frame 2. The spark liquid is injected into the oil seal space 9 by the oil filling device 5. The spark liquid and a small amount of impurities that penetrate into the oil seal space 9 will be discharged from the gap 10 to ensure the purity of the spark liquid in the oil seal space 9.

[0069] It can be seen from the implementation of the above embodiments that the utility model ensures that the spark liquid sealed by the oil seal in the electric spark immersion rotating sealing mechanism is clean, avoids excessive wear of the skeleton sealing ring 3 and the skeleton contact bracket 4, and the replacement of the skeleton sealing ring 3 and the skeleton contact bracket 4 is convenient, fast and low-cost.

[0070] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An electrospark immersion rotary sealing mechanism, comprising a frame (2), a rotary worktable (1) and a rotary sealing assembly, characterized in that: An annular sealing groove (11) is provided at the bottom of the rotary worktable (1), and an annular retaining ring (12) extending downward is provided at the bottom of the rotary worktable (1) on the outer side of the circumference of the sealing groove (11), and a gap (10) is formed between the retaining ring (12) and the frame (2) for preventing particles from entering and for discharging spark liquid and impurities; The rotary seal assembly comprises a skeleton seal ring (3) and a skeleton contact bracket (4); the skeleton seal ring (3) is an annular structure having an open opening (31); the skeleton seal ring (3) is placed upside down in the seal groove (11) with the opening (31) facing downward; the skeleton contact bracket (4) is detachably mounted on the frame (2); the skeleton contact bracket (4) extends upward into the seal groove (11) and is gap-matched with the seal groove (11); and the outer side of the skeleton contact bracket (4) is matched with the inner side of the skeleton seal ring (3); The rotary sealing mechanism is configured such that an oil sealing space (9) is formed by the frame (2), the rotary worktable (1), the skeleton sealing ring (3), the skeleton contact bracket (4), and the cavity between the retaining ring (12); and an oil injection device (5) connected to the oil sealing space (9) is provided on the frame (2).

2. The electric spark immersion rotary sealing mechanism according to claim 1, characterized in that: The sealing groove (11) is provided with a first step portion (111) and a second step portion (112); the first step portion (111) is used to accommodate a skeleton contact bracket (4); the second step portion (112) is used to accommodate a skeleton sealing ring (3); and the depth of the first step portion (111) is greater than the depth of the second step portion (112).

3. The electric spark immersion rotary sealing mechanism according to claim 1, characterized in that: The skeleton contact bracket (4) is made of 40cr alloy steel or 45 carbon steel.

4. The electric spark immersion rotary sealing mechanism according to claim 1, characterized in that: An annular fixing plate (6) is provided at the bottom of the rotating worktable (1) at the position from the retaining ring (12) to the sealing groove (11); the annular fixing plate (6) is fastened to the rotating worktable (1) by screws, and the outer bottom of the skeleton sealing ring (3) is supported by the annular fixing plate (6).

5. The electric spark immersion rotary sealing mechanism according to claim 1, characterized in that: A mounting groove (21) is provided on the frame (2) at a position corresponding to the frame contact bracket (4), and an O-ring (7) is provided between the frame (2) and the frame contact bracket (4).

6. The electric spark immersion rotary sealing mechanism according to claim 1, characterized in that: The size of the gap (10) ranges from 0.5 to 1 mm.

7. An electrospark forming machine tool, characterized in that: The electrospark forming machine tool uses an electrospark immersion rotary sealing mechanism as described in any one of claims 1 to 6.

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