Hydraulic tool holder

Abstract

The application provides a hydraulic tool holder, and relates to the technical field of tool processing. The hydraulic tool holder comprises an inner sleeve, a tool body and a connecting structure. The inner sleeve is used for mounting a tool, and the outer wall of the inner sleeve is provided with the connecting structure in the circumferential direction. The tool body is used for mounting the inner sleeve, and the inner wall of the tool body is provided with a limiting structure which is matched with the shape of the connecting structure. The limiting structure is used for cooperating with the connecting structure to axially and / or radially limit and fix the inner sleeve and the tool body. The connecting structure is arranged on the outer wall of the inner sleeve, and the limiting structure which is complementary in shape is arranged on the corresponding part of the tool body. The inner sleeve and the tool body are axially and / or radially limited and fixed, the relative displacement of the inner sleeve and the tool body in the working process is limited, the connection between the inner sleeve and the tool body is more stable, the hydraulic tool holder can bear greater force, and the overall strength of the hydraulic tool holder is improved.

Description

Technical Field

[0001] This application relates to the field of tool processing, and more particularly to a hydraulic tool holder. Background Technology

[0002] Hydraulic tool holders, as the core connecting component between machine tools and cutting tools, are widely used in aerospace, automotive parts, and precision mold manufacturing industries—fields with stringent machining quality requirements—due to their high clamping accuracy and strong vibration suppression capabilities. Currently, commonly used hydraulic tool holders primarily weld the contact surfaces between the tool body and the inner sleeve into a single unit. During operation, high-pressure hydraulic oil is injected into the oil cavity between the tool body and the inner sleeve, causing the inner sleeve to contract radially, thereby clamping the tool. However, the connection strength between the tool body and the inner sleeve in this type of hydraulic tool holder is limited, resulting in poor overall strength of the tool holder. When the tool holder is subjected to significant force, the connection between the tool body and the inner sleeve is prone to deformation, leading to tool holder damage and consequently affecting machining quality.

[0003] Therefore, there is an urgent need for a hydraulic tool holder with better overall strength. Utility Model Content

[0004] The purpose of this application is to provide a hydraulic tool holder to address the above-mentioned problems.

[0005] This application provides a hydraulic tool holder, comprising: An inner sleeve for mounting a cutting tool, wherein a connecting structure is provided circumferentially on the outer wall of the inner sleeve; The blade body is used to install the inner sleeve, and the inner wall of the blade body is provided with a limiting structure that is adapted to the shape of the connecting mechanism. The limiting structure is used to cooperate with the connecting structure to limit and fix the inner sleeve and the blade body axially and / or radially.

[0006] According to the technical solutions provided in certain embodiments of this application, a first cavity is formed between the outer wall of the inner sleeve and the inner wall of the blade body, and the first cavity is used to contain hydraulic oil.

[0007] According to the technical solutions provided in certain embodiments of this application, the connecting structure has a first limiting surface arranged radially thereon, and the limiting structure has a second limiting surface arranged radially thereon. The first limiting surface and the second limiting surface are connected in cooperation to axially limit the inner sleeve and the blade body.

[0008] According to the technical solutions provided in certain embodiments of this application, the connecting structure has a third limiting surface arranged along its axial direction, and the limiting structure has a fourth limiting surface arranged along its axial direction. The third limiting surface and the fourth limiting surface are connected in cooperation to radially limit the inner sleeve and the blade body.

[0009] According to the technical solutions provided in certain embodiments of this application, the connecting structure includes a first connecting portion and / or a second connecting portion distributed along a first direction and respectively located at both ends of the outer wall of the inner sleeve, wherein the first connecting portion and the second connecting portion each have a first limiting surface and a third limiting surface; the limiting structure includes a first limiting groove and / or a second limiting groove distributed along a first direction and respectively located at both ends of the inner wall of the blade body, wherein the first limiting groove and the second limiting groove each have a second limiting surface and a fourth limiting surface.

[0010] According to the technical solutions provided in certain embodiments of this application, the first connecting portion includes a first connecting surface, a second connecting surface, a third connecting surface, and a fourth connecting surface connected in sequence. The first connecting surface and the third connecting surface extend along a first direction, and the second connecting surface and the fourth connecting surface extend along a second direction. The first direction is perpendicular to the second direction. Wherein, the first connecting surface and the third connecting surface are both the first limiting surface, and the second connecting surface and the fourth connecting surface are both the third limiting surface.

[0011] According to the technical solutions provided in certain embodiments of this application, the second connecting portion includes a fifth connecting surface, a sixth connecting surface, a seventh connecting surface, and an eighth connecting surface connected in sequence. The fifth connecting surface and the seventh connecting surface extend along a first direction, and the sixth connecting surface and the eighth connecting surface extend along a second direction. The first direction is perpendicular to the second direction. The fifth connecting surface and the seventh connecting surface are both the first limiting surface, and the sixth connecting surface and the eighth connecting surface are both the third limiting surface.

[0012] According to the technical solutions provided in certain embodiments of this application, the first limiting groove includes a first positioning surface, a second positioning surface, a third positioning surface, and a fourth positioning surface connected in sequence. The first positioning surface and the third positioning surface extend along a first direction, and the second positioning surface and the fourth positioning surface extend along a second direction. The first positioning surface and the third positioning surface are both second limiting surfaces, and the second positioning surface and the fourth positioning surface are both fourth limiting surfaces. The fourth positioning surface is used to fit against the fourth connecting surface, and a first weld is formed between the first positioning surface, the second positioning surface, and the third positioning surface and the first connecting surface, the second connecting surface, and the third connecting surface.

[0013] According to the technical solution provided in certain embodiments of this application, the second limiting groove includes a fifth positioning surface, a sixth positioning surface, a seventh positioning surface, and an eighth positioning surface connected in sequence. The fifth and seventh positioning surfaces extend along a first direction, and the sixth and eighth positioning surfaces extend along a second direction. The fifth and seventh positioning surfaces are both the second limiting surfaces, and the sixth and eighth positioning surfaces are both the fourth limiting surfaces. A second weld is formed between the fifth, sixth, seventh, and eighth positioning surfaces and the fifth, sixth, seventh, and eighth connecting surfaces.

[0014] According to the technical solutions provided in certain embodiments of this application, a solder groove is provided on both the first connecting surface and the fifth connecting surface. The solder groove is used to contain solder, and the solder is used to fill the first weld and the second weld after melting, so as to weld the first connecting part and the first limiting groove and the second connecting part and the second limiting groove.

[0015] In summary, this application provides a hydraulic tool holder, comprising: an inner sleeve for mounting a tool, the inner sleeve having a connecting structure circumferentially arranged on its outer wall; and a tool body having a first cavity inside, the first cavity for mounting the inner sleeve, and the first cavity having a limiting structure adapted to the shape of the connecting structure, the limiting structure being used to cooperate with the connecting structure to axially and / or radially limit and fix the inner sleeve and the tool body. This application, by providing a connecting structure on the outer wall of the inner sleeve and a complementary limiting structure at a corresponding location on the tool body, axially and / or radially limits and fixes the inner sleeve and the tool body, restricting the relative displacement of the inner sleeve and the tool body during operation, making the connection between the inner sleeve and the tool body more stable, thereby enabling it to withstand greater forces and improving the overall strength of the hydraulic tool holder.

[0016] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a hydraulic tool holder provided in an embodiment of this application; Figure 2 A cross-sectional view of a hydraulic tool holder provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of the first connecting portion provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of the second connecting part provided in an embodiment of this application; Figure 5 A schematic diagram of a right-angle tenon and mortise structure provided in an embodiment of this application; Figure 6 This is a schematic diagram of the inclined mortise and tenon structure provided in the embodiments of this application.

[0019] The text labels in the image represent: 1. Inner sleeve; 2. Tool body; 3. Connecting structure; 31. First connecting part; 311. First connecting surface; 312. Second connecting surface; 313. Third connecting surface; 314. Fourth connecting surface; 32. Second connecting part; 321. Fifth connecting surface; 322. Sixth connecting surface; 323. Seventh connecting surface; 324. Eighth connecting surface; 33. Third connecting part; 4. Limiting structure; 41. First limiting groove; 411. First positioning surface; 412. Second positioning surface; 413. Third positioning surface; 414. Fourth positioning surface; 42. Second limiting groove; 421. Fifth positioning surface; 422. Sixth positioning surface; 423. Seventh positioning surface; 424. Eighth positioning surface; 6. First cavity; 7. Solder groove; 8. Solder; 9. Groove; 10. Second cavity. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this application.

[0021] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0022] As mentioned in the background section, in view of the problems in the prior art, this embodiment provides a hydraulic tool holder, including: Inner sleeve 1, inner sleeve 1 is used to install the cutting tool, and the outer wall of inner sleeve 1 is provided with a connecting structure 3 in the circumferential direction; The blade body 2 is used to install the inner sleeve 1, and the inner wall of the blade body is provided with a limiting structure 4 that matches the shape of the connecting structure 3. The limiting structure 4 is used to cooperate with the connecting structure 3 to limit and fix the inner sleeve 1 and the blade body 2 axially and / or radially.

[0023] For details, please refer to Figure 1 The inner sleeve 1 is used to install the cutting tool, and a connecting structure 3 is provided circumferentially on the outer wall of the inner sleeve 1. The inner wall of the inner sleeve also has multiple grooves 9, which are spirally distributed axially to store impurities generated during tool installation or removal, preventing jamming during tool installation or removal. The cutting tool body 2 is used to install the inner sleeve 1, and its inner wall has a limiting structure 4 that matches the shape of the connecting structure 3. The limiting structure 4 is used to connect with the connecting structure 3 to axially and / or radially limit and fix the inner sleeve 1 and the cutting tool body 2, including three cases: axial limiting and fixing only, radial limiting and fixing only, and simultaneous axial and radial limiting and fixing. In this embodiment, the cutting tool body 2 can be made of wear-resistant mold steel. Furthermore, a second cavity 10 is provided inside the cutting tool body 2, located at the end of the cutting tool body 2 away from the inner sleeve 1, for installing the drive end of the machine tool to drive the cutting tool body 2, the inner sleeve 1, and the cutting tool held by the inner sleeve 1 to rotate synchronously, thereby achieving cutting of the workpiece. The size and shape of the second cavity 10 will be adapted to the standard interface size and shape of the machine tool drive end (such as HSK (hollow short taper tool holder), SK (German standard short taper tool holder), PSC (polygonal taper interface), BT (Japanese standard taper tool holder), etc.), and no specific limitation is made here.

[0024] The limiting structure 4 and the connecting structure 3 can have various shapes: for example, when simultaneously limiting the inner sleeve 1 and the tool body 2 axially and radially: such as Figure 5As shown, when the inner diameter of the inner sleeve 1 is ≥25mm, the inner diameter of the cutter body 2 is also correspondingly larger. At this time, there is sufficient machining space for the limiting structure 4 and the connecting structure 3, allowing for the use of a right-angle tenon and mortise structure. That is, the mating surfaces of the connecting structure 3 and the limiting structure 4 are right-angled surfaces perpendicular to the axial direction. Through the engagement of the right-angle tenon and the right-angle mortise, the axial and / or radial displacement of the inner sleeve 1 and the cutter body 2 is restricted. For example... Figure 6 As shown, when the inner diameter of the inner sleeve 1 is less than 25mm, the inner diameter of the cutter body 2 is correspondingly smaller. Within this space, it is difficult to machine a right-angle tenon structure (the cutting tool cannot penetrate deeply enough to complete the cutting of the right-angle surface). In this case, a beveled tenon structure can be used, meaning the cutting tool can cut along the inclined direction. This makes part of the mating surface between the connecting structure 3 and the limiting structure 4 an inclined surface. The normal component of the inclined surface can limit the axial displacement of the inner sleeve 1, while the radial component can constrain its radial displacement. This also achieves axial and / or radial limiting and fixing of the inner sleeve 1 and the cutter body 2. In this embodiment, the inclination angle A° of the inclined surface satisfies 5°≤A°≤45°, but the inclination angle can be adjusted according to the inner diameter of the inner sleeve 1 and actual machining requirements; no specific limitation is made here.

[0025] This application provides a connecting structure on the outer wall of the inner sleeve and a complementary limiting structure at the corresponding part of the blade body to limit and fix the inner sleeve and the blade body axially and / or radially. This restricts the relative displacement between the inner sleeve and the blade body during operation, resulting in a more stable connection between the inner sleeve and the blade body. This allows the inner sleeve to withstand greater forces, improves the overall strength of the hydraulic tool holder, and solves the problem of insufficient connection strength between the blade body and the inner sleeve in existing hydraulic tool holders, which leads to tool holder damage.

[0026] In a preferred embodiment, a first cavity 6 is formed between the outer wall of the inner sleeve 1 and the inner wall of the blade body 2, and the first cavity 6 is used to contain hydraulic oil.

[0027] Specifically, such as Figure 1 As shown, a first cavity 6 is formed between the outer wall of the inner sleeve 1 and the inner wall of the cutter body 2, which is used to contain hydraulic oil. When it is necessary to clamp the cutter, hydraulic oil is injected into the first cavity 6 through a preset oil injection channel (not shown in the figure) on the cutter body 2. As the hydraulic oil is continuously filled, the pressure inside the cavity gradually increases. According to Pascal's law (pressure applied to any part of a closed fluid (liquid or gas) will be transmitted from the fluid in all directions without changing magnitude), the hydraulic oil will transmit the pressure to the outer wall of the inner sleeve 1, causing the inner sleeve 1 to contract radially until it fits against the outer wall of the cutter, at which point the injection of hydraulic oil stops. In this embodiment, a third connecting part 33 can also be provided in the middle section of the outer wall of the inner sleeve 1, so that a double-ear-shaped first cavity 6 is formed between the third connecting part 33 and the inner wall of the cutter body 2, so that the injected hydraulic oil can be distributed more evenly in the first cavity 6.

[0028] In a preferred embodiment, the connecting structure 3 has a first limiting surface arranged along its axial direction, and the limiting structure 4 has a second limiting surface arranged along its axial direction. The first limiting surface and the second limiting surface are connected to each other to radially limit the inner sleeve 1 and the cutter body 2.

[0029] Specifically, the connecting structure 3 has a first limiting surface arranged along its axial direction, and the limiting structure 4 has a second limiting surface arranged along its axial direction. The first and second limiting surfaces are connected in a cooperative manner to limit the relative displacement of the inner sleeve 1 and the tool body 2 in the radial direction, thereby improving the overall strength of the tool holder. When the tool holder is subjected to radial forces generated during the cutting process (such as the horizontal resistance force when milling side grooves, the lateral thrust during the initial cutting stage of drilling, the cutting resistance during radial feed of boring, etc.), the first and second limiting surfaces will be connected in a cooperative manner to bear these radial forces, preventing radial movement or wobble of the inner sleeve and the tool body. It can also prevent the leakage of hydraulic oil in the first cavity 6 due to radial damage to the inner sleeve 1 and the tool body 2, ensuring that the machining can proceed normally.

[0030] In a preferred embodiment, the connecting structure 3 has a third limiting surface arranged radially thereon, and the limiting structure 4 has a fourth limiting surface arranged radially thereon. The third limiting surface and the fourth limiting surface are connected in a cooperative manner to axially limit the inner sleeve 1 and the cutter body 2.

[0031] Specifically, the connecting structure 3 has a third limiting surface arranged radially therein, and the limiting structure 4 has a fourth limiting surface arranged radially therein. The third and fourth limiting surfaces are connected in a mating manner to limit the relative displacement of the inner sleeve 1 and the tool body 2 in the axial direction, thereby improving the overall strength of the tool holder. When the tool holder is subjected to axial forces generated during the cutting process (such as the feed thrust during drilling or the axial component force during milling), the third and fourth limiting surfaces will be connected in a mating manner to resist these axial forces, preventing axial movement or gaps between the inner sleeve and the tool body, thus ensuring a tight connection between the two, and also reducing the risk of hydraulic oil leakage in the first cavity 6.

[0032] In a preferred embodiment, the connecting structure 3 includes a first connecting portion 31 and / or a second connecting portion 32 distributed along a first direction and located at both ends of the outer wall of the inner sleeve 1, wherein the first connecting portion 31 and the second connecting portion 32 each have a first limiting surface and a third limiting surface; the limiting structure 4 includes a first limiting groove 41 and a second limiting groove 42 distributed along a first direction and located at both ends of the inner wall of the blade body 2, wherein the first limiting groove 41 and the second limiting groove 42 each have a second limiting surface and a fourth limiting surface.

[0033] Specifically, such as Figure 2As shown, the connecting structure 3 includes a first connecting portion 31 and / or a second connecting portion 32 distributed along the first direction and located at both ends of the outer wall of the inner sleeve 1. Both the first connecting portion 31 and the second connecting portion 32 have a first limiting surface and a third limiting surface. This includes three scenarios: having the first connecting portion 31, having only the second connecting portion 32, and having both the first connecting portion 31 and the second connecting portion 32. The first and third limiting surfaces of a single connecting portion, in conjunction with the limiting structure, can limit the radial and axial movement of the inner sleeve 1 and the tool body 2. This is suitable for lightweight tool holder scenarios where connection strength requirements are low and structural simplification is needed. Having both the first connecting portion 31 and the second connecting portion 32 can evenly distribute radial and axial forces to the two connecting portions, improving the connection rigidity and load-bearing capacity of the inner sleeve 1 and the tool body 2. This is suitable for scenarios with higher requirements for tool holder strength, such as high-speed, heavy-duty cutting (e.g., heavy-duty milling, high-strength drilling).

[0034] The limiting structure 4 includes a first limiting groove 41 and / or a second limiting groove 42 distributed along a first direction and located at both ends of the inner wall of the blade body 2. Both the first limiting groove 41 and the second limiting groove 42 have a second limiting surface and a fourth limiting surface. Corresponding to the configuration of the connecting structure 3, when the connecting structure 3 only has a first connecting part 31, the limiting structure 4 only needs to have a corresponding first limiting groove 41; when the connecting structure 3 only has a second connecting part 32, the limiting structure 4 only needs to have a corresponding second limiting groove 42; when the connecting structure 3 has both a first connecting part 31 and a second connecting part 32, the limiting structure 4 needs to have a first limiting groove 41 corresponding to the first connecting part 31 and a second limiting groove 42 corresponding to the second connecting part 32.

[0035] In a preferred embodiment, the first connecting portion 31 includes a first connecting surface 311, a second connecting surface 312, a third connecting surface 313, and a fourth connecting surface 314 connected in sequence. The first connecting surface 311 and the third connecting surface 313 extend along a first direction, and the second connecting surface 312 and the fourth connecting surface 314 extend along a second direction. The first direction is perpendicular to the second direction. The first connecting surface 311 and the third connecting surface 313 are both first limiting surfaces, and the second connecting surface 312 and the fourth connecting surface 314 are both third limiting surfaces.

[0036] Specifically, such as Figure 3As shown, the first connecting part 31 includes a first connecting surface 311, a second connecting surface 312, a third connecting surface 313, and a fourth connecting surface 314 connected in sequence. The first connecting surface 311 and the third connecting surface 313 extend along a first direction, and the second connecting surface 312 and the fourth connecting surface 314 extend along a second direction, with the first direction perpendicular to the second direction. The first connecting surface 311 and the third connecting surface 313 are both first limiting surfaces, and the second connecting surface 312 and the fourth connecting surface 314 are both third limiting surfaces. The first direction is the axial direction of the connecting structure 3, and the second direction is the radial direction of the connecting structure 3. Through the first connecting surface 311 and the third connecting surface 313 (two first limiting surfaces) extending along the axial direction, the inner sleeve 1 and the cutter body 2 can be radially constrained simultaneously; through the second connecting surface 312 and the fourth connecting surface 314 (two third limiting surfaces) extending radially, the inner sleeve 1 and the cutter body 2 can be axially constrained simultaneously. This design allows the axial and radial forces to be evenly distributed to the two sets of connecting surfaces, avoiding local overload on a single limiting surface and further strengthening the connection between the inner sleeve 1 and the cutter body 2.

[0037] In a preferred embodiment, the second connecting portion 32 includes a fifth connecting surface 321, a sixth connecting surface 322, a seventh connecting surface 323, and an eighth connecting surface 324 connected in sequence. The fifth connecting surface 321 and the seventh connecting surface 323 extend along a first direction, and the sixth connecting surface 322 and the eighth connecting surface 324 extend along a second direction. The first direction is perpendicular to the second direction. The fifth connecting surface 321 and the seventh connecting surface 323 are both first limiting surfaces, and the sixth connecting surface 322 and the eighth connecting surface 324 are both third limiting surfaces.

[0038] Specifically, such as Figure 4 As shown, the second connecting part 32 includes a fifth connecting surface 321, a sixth connecting surface 322, a seventh connecting surface 323, and an eighth connecting surface 324 connected in sequence. The fifth connecting surface 321 and the seventh connecting surface 323 extend along a first direction, and the sixth connecting surface 322 and the eighth connecting surface 324 extend along a second direction, with the first direction perpendicular to the second direction. The fifth connecting surface 321 and the seventh connecting surface 323 are both first limiting surfaces, and the sixth connecting surface 322 and the eighth connecting surface 324 are both third limiting surfaces. Its operational logic is exactly the same as that of the first connecting part 31. The fifth connecting surface and the seventh connecting surface (first limiting surface) cooperate with the second limiting surface of the tool body 2 limiting structure 4 to constrain and limit the radial displacement of the inner sleeve 1 relative to the tool body 2, preventing the inner sleeve 1 from radially wobbling relative to the tool body 2. The sixth connecting surface and the eighth connecting surface (third limiting surface) cooperate with the fourth limiting surface of the tool body limiting structure to resist the cutting axial force and prevent the inner sleeve 1 from axially moving relative to the tool body 2.

[0039] In a preferred embodiment, the first limiting groove 41 includes a first positioning surface 411, a second positioning surface 412, a third positioning surface 413, and a fourth positioning surface 414 connected in sequence. The first positioning surface 411 and the third positioning surface 413 extend along a first direction, and the second positioning surface 412 and the fourth positioning surface 414 extend along a second direction. The first positioning surface 411 and the third positioning surface 413 are both second limiting surfaces, and the second positioning surface 412 and the fourth positioning surface 414 are both fourth limiting surfaces. The fourth positioning surface 414 is used to fit against the fourth connecting surface 314, and a first weld is formed between the first positioning surface 411, the second positioning surface 412, and the third positioning surface 413 and the first connecting surface 311, the second connecting surface 312, and the third connecting surface 313.

[0040] Specifically, such as Figure 3 As shown, the first limiting groove 41 includes a first positioning surface 411, a second positioning surface 412, a third positioning surface 413, and a fourth positioning surface 414 connected in sequence. The first positioning surface 411 and the third positioning surface 413 extend along a first direction, and the second positioning surface 412 and the fourth positioning surface 414 extend along a second direction. The first positioning surface 411 and the third positioning surface 413 are both second limiting surfaces, and the second positioning surface 412 and the fourth positioning surface 414 are both fourth limiting surfaces. The fourth positioning surface 414 is used to fit against the fourth connecting surface 314. While limiting the axial displacement of the inner sleeve 1 relative to the cutter body 2, it can also prevent foreign objects (such as metal shavings or assembly materials) that may be generated during the assembly or processing of the inner sleeve 1 and the cutter body 2 from seeping into the first cavity 6, thus avoiding functional abnormalities in the internal structure of the first cavity 6 due to the intrusion of foreign objects. The first positioning surface 411 and the first connecting surface 311 are correspondingly arranged, and the third positioning surface 413 and the third connecting surface 313 are correspondingly arranged to limit the radial displacement of the inner sleeve 1 relative to the cutter body 2. The second positioning surface 412 and the second connecting surface 312 are correspondingly arranged to limit the axial displacement of the inner sleeve 1 relative to the cutter body 2. The first positioning surface 411, the second positioning surface 412 and the third positioning surface 413 form a first weld with the first connecting surface 311, the second connecting surface 312 and the third connecting surface 313. In this embodiment, the weld width is 0.01mm-0.08mm. The weld width is determined by the amount of solder filling and can be adjusted according to the actual situation.

[0041] In a preferred embodiment, the second limiting groove 42 includes a fifth positioning surface 421, a sixth positioning surface 422, a seventh positioning surface 423, and an eighth positioning surface 424 connected in sequence. The fifth positioning surface 421 and the seventh positioning surface 423 extend along a first direction, and the sixth positioning surface 422 and the eighth positioning surface 424 extend along a second direction. The fifth positioning surface 421 and the seventh positioning surface 423 are both second limiting surfaces, and the sixth positioning surface 422 and the eighth positioning surface 424 are both fourth limiting surfaces. A second weld is formed between the fifth positioning surface 421, the sixth positioning surface 422, the seventh positioning surface 423, and the eighth positioning surface 424 and the fifth connecting surface 321, the sixth connecting surface 322, the seventh connecting surface 323, and the eighth connecting surface 324.

[0042] Specifically, such as Figure 4 As shown, the second limiting groove 42 includes a fifth positioning surface 421, a sixth positioning surface 422, a seventh positioning surface 423, and an eighth positioning surface 424 connected in sequence. The fifth positioning surface 421 and the seventh positioning surface 423 extend along a first direction, and the sixth positioning surface 422 and the eighth positioning surface 424 extend along a second direction. The fifth positioning surface 421 and the seventh positioning surface 423 are both second limiting surfaces, and the sixth positioning surface 422 and the eighth positioning surface 424 are both fourth limiting surfaces. The fifth positioning surface 421 and the seventh positioning surface 423 correspond to the fifth connecting surface 321 and the seventh connecting surface 323, respectively, and are used to limit the radial displacement of the inner sleeve 1 relative to the cutter body 2. The sixth positioning surface 422 and the eighth positioning surface 424 correspond to the sixth connecting surface 322 and the eighth connecting surface 324, respectively, and are used to limit the axial displacement of the inner sleeve 1 relative to the cutter body 2. Furthermore, a second weld is formed between the fifth positioning surface 421, the sixth positioning surface 422, the seventh positioning surface 423, and the eighth positioning surface 424 and the fifth connecting surface 321, the sixth connecting surface 322, the seventh connecting surface 323, and the eighth connecting surface 324. In this embodiment, the weld width is 0.01mm-0.08mm.

[0043] In a preferred embodiment, solder grooves 7 are provided on both the first connecting surface 311 and the fifth connecting surface 321. The solder grooves 7 are used to accommodate solder 8. The solder 8 is used to fill the first weld and the second weld after melting, so as to weld the first connecting part 31 and the first limiting groove 41, and the second connecting part 32 and the second limiting groove 42.

[0044] Specifically, such as Figure 2As shown, solder grooves 7 are provided on both the first connecting surface 311 and the fifth connecting surface 321. The solder grooves 7 are used to hold solder 8, which, after melting, fills the first weld and the second weld to weld the first connecting part 31 to the first limiting groove 41 and the second connecting part 32 to the second limiting groove 42. When the solder 8 is heated and melts into a liquid state, capillary attraction is formed in the first and second welds, ensuring that the liquid solder fully fills the gap between the first and second welds, avoiding any unfilled voids and ensuring the tightness of the first and second welds. After the solder 8, filled by capillary action, cools, it allows the first connecting part to the first limiting groove and the second connecting part to the second limiting groove to form a well-integrated welded structure, making the connection between the inner sleeve 1 and the tool body 2 more robust, thereby improving the overall strength of the hydraulic tool holder.

[0045] This application provides a connecting structure on the outer wall of the inner sleeve, and a matching limiting structure on the corresponding part of the tool body. By welding the limiting surfaces of the two together, the inner sleeve and the tool body are limited and fixed in the axial and / or radial direction. The multiple connecting and positioning surfaces increase the contact area between the inner sleeve and the tool body, allowing them to form a multi-faceted fit rather than a local contact. This better disperses the axial and radial forces generated during the cutting process, allowing the hydraulic tool holder to withstand greater forces without being damaged, improving the overall strength of the tool holder, and preventing the leakage of hydraulic oil in the second cavity, thus ensuring the normal use of the tool holder.

[0046] To facilitate understanding by those skilled in the art, the working process of the hydraulic tool holder provided in this application is further as follows: The first connecting portion 31 and the second connecting portion 32 at both ends of the outer wall of the inner sleeve 1 are respectively welded to the first limiting groove 41 and the second limiting groove 42 at the corresponding ends of the inner wall of the first cavity 5 of the cutter body 2. The first connecting portion 31, with its first connecting surface 311 and third connecting surface 313 extending along a first direction, connects with the first limiting groove 41 corresponding to the first positioning surface 411 and the third positioning surface 413 to achieve radial positioning. Its second connecting surface 312 and fourth connecting surface 314 extending along a second direction connect with the first limiting groove 41 corresponding to the second positioning surface 412 and the fourth positioning surface 414 to achieve axial positioning. The second connecting portion 32, along the first direction... Radial positioning is achieved by connecting the extended fifth connecting surface 321 and the seventh connecting surface 323 with the second limiting groove 42 corresponding to the fifth positioning surface 421 and the seventh positioning surface 423. Axial positioning is achieved by the sixth connecting surface 322 and the eighth connecting surface 324 extending along the second direction with the second limiting groove 42 corresponding to the sixth positioning surface 422 and the eighth positioning surface 424. The tool is installed in the inner sleeve 1, and hydraulic oil is injected into the first cavity 6 between the inner sleeve 1 and the inner wall of the tool body 2. As the hydraulic oil is continuously filled, the pressure in the cavity gradually increases, causing the inner sleeve 1 to contract radially until it is in contact with the outer wall of the tool and then the injection of hydraulic oil stops.

[0047] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A hydraulic tool holder, characterized in that, include: Inner sleeve (1), the inner sleeve (1) is used to install the cutting tool, and the outer wall of the inner sleeve (1) is provided with a connecting structure (3) in the circumferential direction. The blade body (2) is used to install the inner sleeve (1), and the inner wall of the blade body (2) is provided with a limiting structure (4) that matches the shape of the connecting structure (3). The limiting structure (4) is used to cooperate with the connecting structure (3) to limit and fix the inner sleeve (1) and the blade body (2) axially and / or radially.

2. The hydraulic tool holder according to claim 1, characterized in that, A first cavity (6) is formed between the outer wall of the inner sleeve (1) and the inner wall of the blade body (2), and the first cavity (6) is used to contain hydraulic oil.

3. The hydraulic tool holder according to claim 2, characterized in that, The connecting structure (3) has a first limiting surface arranged along its axial direction, and the limiting structure (4) has a second limiting surface arranged along its axial direction. The first limiting surface and the second limiting surface are connected in cooperation to radially limit the inner sleeve (1) and the blade body (2).

4. The hydraulic tool holder according to claim 3, characterized in that, The connecting structure (3) has a third limiting surface arranged radially thereon, and the limiting structure (4) has a fourth limiting surface arranged radially thereon. The third limiting surface and the fourth limiting surface are connected in a cooperative manner to axially limit the inner sleeve (1) and the blade body (2).

5. The hydraulic tool holder according to claim 4, characterized in that, The connecting structure (3) includes a first connecting portion (31) and / or a second connecting portion (32) distributed along the first direction and located at both ends of the outer wall of the inner sleeve (1), and the first connecting portion (31) and the second connecting portion (32) each have a first limiting surface and a third limiting surface; the limiting structure (4) includes a first limiting groove (41) and / or a second limiting groove (42) distributed along the first direction and located at both ends of the inner wall of the blade body (2), and the first limiting groove (41) and the second limiting groove (42) each have a second limiting surface and a fourth limiting surface.

6. The hydraulic tool holder according to claim 5, characterized in that, The first connecting part (31) includes a first connecting surface (311), a second connecting surface (312), a third connecting surface (313), and a fourth connecting surface (314) connected in sequence. The first connecting surface (311) and the third connecting surface (313) extend along a first direction, and the second connecting surface (312) and the fourth connecting surface (314) extend along a second direction. The first direction is perpendicular to the second direction. The first connecting surface (311) and the third connecting surface (313) are both the first limiting surface, and the second connecting surface (312) and the fourth connecting surface (314) are both the third limiting surface.

7. The hydraulic tool holder according to claim 6, characterized in that, The second connecting part (32) includes a fifth connecting surface (321), a sixth connecting surface (322), a seventh connecting surface (323), and an eighth connecting surface (324) connected in sequence. The fifth connecting surface (321) and the seventh connecting surface (323) extend along a first direction, and the sixth connecting surface (322) and the eighth connecting surface (324) extend along a second direction. The first direction is perpendicular to the second direction. The fifth connecting surface (321) and the seventh connecting surface (323) are both the first limiting surface, and the sixth connecting surface (322) and the eighth connecting surface (324) are both the third limiting surface.

8. The hydraulic tool holder according to claim 7, characterized in that, The first limiting groove (41) includes a first positioning surface (411), a second positioning surface (412), a third positioning surface (413), and a fourth positioning surface (414) connected in sequence. The first positioning surface (411) and the third positioning surface (413) extend along a first direction, and the second positioning surface (412) and the fourth positioning surface (414) extend along a second direction. The first positioning surface (411) and the third positioning surface (413) are both the second limiting surface, and the second positioning surface (412) and the fourth positioning surface (414) are both the fourth limiting surface. The fourth positioning surface (414) is used to fit with the fourth connecting surface (314), and a first weld is formed between the first positioning surface (411), the second positioning surface (412), and the third positioning surface (413) and the first connecting surface (311), the second connecting surface (312), and the third connecting surface (313).

9. The hydraulic tool holder according to claim 8, characterized in that, The second limiting groove (42) includes a fifth positioning surface (421), a sixth positioning surface (422), a seventh positioning surface (423), and an eighth positioning surface (424) connected in sequence. The fifth positioning surface (421) and the seventh positioning surface (423) extend along a first direction, and the sixth positioning surface (422) and the eighth positioning surface (424) extend along a second direction. The fifth positioning surface (421) and the seventh positioning surface (423) are both the second limiting surface, and the sixth positioning surface (422) and the eighth positioning surface (424) are both the fourth limiting surface. A second weld is formed between the fifth positioning surface (421), the sixth positioning surface (422), the seventh positioning surface (423), and the eighth positioning surface (424) and the fifth connecting surface (321), the sixth connecting surface (322), the seventh connecting surface (323), and the eighth connecting surface (324).

10. The hydraulic tool holder according to claim 9, characterized in that, Solder grooves (7) are provided on the first connecting surface (311) and the fifth connecting surface (321). The solder grooves (7) are used to contain solder (8). The solder (8) is used to fill the first weld and the second weld after melting, so as to weld the first connecting part (31) and the first limiting groove (41) and the second connecting part (32) and the second limiting groove (42).

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