Inner-cooling post-pulling extension rod

Abstract

The utility model discloses an inner-cooling post-pulling extension rod which comprises an extension rod body, a through cavity is formed in the extension rod body, and the through cavity comprises a mounting section and an adjusting section which are connected with each other; a cutter is fixedly mounted at the opening of the mounting section through a chuck; an adjusting screw penetrates through an opening of the adjusting section, a first through cooling cavity is formed in the middle of the adjusting screw, and the tail end of the first cooling cavity communicates with external cooling liquid. The cutter is installed on the mechanical main shaft of the machine tool through the extension rod body, the length of the cutter is finely adjusted and matched through the adjusting screw, and meanwhile high-pressure cooling liquid in the mechanical main shaft smoothly enters the extension rod body through the first cooling cavity in the middle of the adjusting screw and flows to the cutter for cooling. Therefore, the high-pressure inner cooling function is achieved while the high clamping precision is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining, and particularly relates to an internally cooled pull-back extension rod. Background Art

[0002] When machining in a narrow space with a small-diameter tool, an extension rod is usually used to hold the tool. Side-fixed extension rods, pull-back extension rods, and collet chucks are usually available. The side-fixed extension rod has low clamping accuracy and is difficult to meet the requirements of high-precision machining. The pull-back extension rod has high clamping accuracy but is difficult to remove the tool and has no internal cooling function. The collet chuck has low clamping accuracy due to deformation during the rotation of the collet, making it difficult to meet the machining requirements. Content of the Utility Model

[0003] In view of the above problems in the prior art, the utility model provides an internally cooled pull-back extension rod, which solves the problem that the existing extension rod cannot cool the tool while taking into account the clamping accuracy.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] An internally cooled pull-back extension rod is provided, which includes an extension rod body. A through cavity is opened inside the extension rod body. The through cavity includes a connected installation section and an adjustment section. At the opening of the installation section, a tool is installed and fixed through a chuck. An adjustment screw penetrates through the opening of the adjustment section. A through first cooling cavity is opened in the middle of the adjustment screw, and the tail end of the first cooling cavity is communicated with external coolant.

[0006] The utility model installs the tool on the mechanical spindle of the machining machine tool through the extension rod body, and finely adjusts and matches the length of the tool through the adjustment screw. At the same time, the high-pressure coolant in the mechanical spindle smoothly enters the extension rod body through the first cooling cavity in the middle of the adjustment screw and flows to the tool for cooling, so as to have a high-pressure internal cooling function while having high clamping accuracy.

[0007] Further, the chuck includes a connected connecting cylinder and a clamping cylinder. A connecting screw hole is opened inside the connecting cylinder;

[0008] The clamping cylinder includes a plurality of clamping sub-cylinders. The plurality of clamping sub-cylinders are arranged in a ring to form a cone and are connected to the connecting cylinder. An installation channel is opened in the middle of the plurality of clamping sub-cylinders. The tool passes through the installation channel and is inserted into the connecting screw hole and is connected to the connecting screw hole.

[0009] Further, the installation section includes a connected long cone section and a straight cylinder section. The connecting cylinder of the chuck is embedded in the straight cylinder section, and the clamping cylinder falls into the long cone section, and the conical surface of the long cone section fits with the conical surface of the clamping cylinder.

[0010] Furthermore, an installation table is provided between the installation section and the adjustment section. A through hole is opened in the middle of the installation table; a connecting screw is inserted into the through hole, and the connecting screw passes through the through hole and inserts into the connecting screw hole and is connected to the connecting screw hole.

[0011] Furthermore, a through second cooling cavity is opened in the middle of the connecting screw.

[0012] Furthermore, a lock nut is provided on the adjusting screw.

[0013] Furthermore, a clamping table surface is provided on the extension rod body

[0014] Furthermore, a sealing ring is provided at the opening of the first cooling cavity.

[0015] The utility model discloses an internally cooled rear-pulling extension rod, and its beneficial effects are as follows:

[0016] The utility model installs a tool on the mechanical spindle of a processing machine tool through an extension rod body, and finely adjusts and matches the tool length through an adjusting screw. At the same time, high-pressure coolant in the mechanical spindle smoothly enters the extension rod body through the first cooling cavity in the middle of the adjusting screw and flows to the tool for cooling, so as to have a high-pressure internal cooling function while having high clamping accuracy. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an internally cooled rear-pulling extension rod of the utility model.

[0018] Figure 2 It is a schematic internal structure diagram of an internally cooled rear-pulling extension rod of the utility model.

[0019] Figure 3 It is a schematic structural diagram of a chuck of the utility model.

[0020] Figure 4 It is a schematic side view structure diagram of a chuck of the utility model.

[0021] Figure 5 It is a schematic front view structure diagram of a chuck of the utility model.

[0022] Figure 6 For the Figure 5 cross-sectional schematic diagram at A-A of the utility model.

[0023] Among them, 1. Extension rod body; 11. Clamping tabletop; 2. Through cavity; 21. Installation section; 22. Adjustment section; 23. Long taper section; 24. Straight cylinder section; 25. Installation table; 26. Through hole; 27. Connecting screw; 28. Second cooling cavity; 3. Tool; 4. Chuck; 41. Connecting cylinder; 42. Clamping cylinder; 43. Connecting screw hole; 44. Clamping sub-cylinder; 5. Adjusting screw; 51. First cooling cavity; 52. Locking nut; 53. Sealing ring. Specific embodiments

[0024] The specific embodiments of the present invention will be described to facilitate those skilled in the art of this technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those ordinary skilled in the art of this technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the present invention are within the scope of protection.

[0025] Embodiment 1

[0026] Refer to Figures 1-2 , which is a schematic structural diagram of an internally cooled and rear-pulled extension rod of this embodiment. Its purpose is to solve the problem that the existing extension rod cannot cool the tool while taking into account the clamping accuracy. The specific structure in this embodiment will be described in detail below.

[0027] An internally cooled and rear-pulled extension rod includes an extension rod body 1 and an adjusting screw 5.

[0028] Among them, a through cavity 2 penetrating the extension rod body 1 is opened inside the extension rod body 1, and the through cavity 2 includes a connected installation section 21 and an adjustment section 22.

[0029] Specifically, a tool 3 is installed and fixed at the opening of the installation section 21 through a chuck 4. An adjusting screw 5 is inserted through the opening of the adjustment section 22. Internal threads are provided on the inner wall of the adjustment section 22. The adjusting screw 5 is connected to the adjustment section 22 through threads, so as to finely adjust the length of the tool 3 by the depth of the adjusting screw 5 in the adjustment section 22. At the same time, a locking nut 52 is provided on the adjusting screw 5. The adjusting screw 5 and the locking nut 52 are connected through threads to lock the adjusting screw 5 after the adjustment of the adjusting screw 5 is completed.

[0030] A through first cooling cavity 51 is opened in the middle of the adjusting screw 5, and the tail end of the first cooling cavity 51 is communicated with external coolant. Thus, the tool 3 is installed on the mechanical spindle of the machine tool through the extension rod body 1, so that the high-pressure coolant in the mechanical spindle can smoothly enter the extension rod body 1 and flow to the tool 3 for cooling, so as to have a high-pressure internal cooling function while having high clamping accuracy.

[0031] Optionally, a coolant channel is provided at the center of the cutting tool 3, so that high-pressure coolant is in the coolant channel of the cutting tool 3, further improving the cooling effect of the cutting tool 3.

[0032] Optionally, a clamping table surface 11 is provided on the extension rod body 1. The cross-section of the clamping table surface 11 can be a regular polygon. In this embodiment, it is a regular hexagon for the convenience of the operator to clamp.

[0033] Optionally, a sealing ring 53 is provided at the opening of the first cooling chamber 51. The opening of the first cooling chamber 51 is in contact with the output port of the high-pressure coolant in the mechanical spindle, and the sealing ring 53 is used to improve the sealing of the contact.

[0034] Embodiment 2

[0035] Reference Figure 2 Figure 6 , which is a structural schematic diagram of an internally cooled and rear-pulled extension rod of this embodiment. Based on Embodiment 1, this embodiment gives further solutions for the chuck 4 and the installation section 21. The purpose is to solve the problem that the existing extension rod cannot cool the cutting tool while taking into account the clamping accuracy. The specific structures of the chuck 4 and the installation section 21 in this embodiment will be described in detail below.

[0036] The chuck 4 includes a connected connection cylinder 41 and a clamping cylinder 42.

[0037] Among them, a connection screw hole 43 is provided inside the connection cylinder 41; and the clamping cylinder 42 includes a plurality of clamping sub-cylinders 44. The plurality of clamping sub-cylinders 44 are arranged in a ring to form a cone and are connected to the connection cylinder 41.

[0038] Specifically, an installation channel is provided in the middle of the plurality of clamping sub-cylinders 44. The cutting tool 3 passes through the installation channel and is inserted into the connection screw hole 43 and is connected to the connection screw hole 43.

[0039] The installation section 21 includes a connected long cone section 23 and a straight cylinder section 24; the connection cylinder 41 of the chuck 4 is embedded in the straight cylinder section 24, the clamping cylinder 42 falls into the long cone section 23, and the conical surface of the long cone section 23 fits with the conical surface of the clamping cylinder 42.

[0040] In this embodiment, the clamping cylinder 42 forms a cone through the circumferential arrangement of a plurality of clamping sub-cylinders 44. The outer conical surface of the conical clamping cylinder 42 fits with the conical surface of the long cone section 23 in the installation section 21. Thus, when the chuck 4 is embedded in the installation section 21, the connection cylinder 41 of the chuck 4 is embedded in the straight cylinder section 24, the clamping cylinder 42 of the chuck 4 falls into the long cone section 23, and the cutting tool 3 passes through the installation channel and is inserted into the connection screw hole 43 and is connected to the connection screw hole 43 by a thread to preliminarily fix the cutting tool 3.

[0041] Specifically, an installation table 25 is provided between the installation section 21 and the adjustment section 22. A through hole 26 is formed in the middle of the installation table 25. A connecting screw 27 is inserted into the through hole 26. The connecting screw 27 passes through the through hole 26 and is inserted into the connecting screw hole 43, and is connected to the connecting screw hole 43.

[0042] In this embodiment, the connecting screw 27 passes through the through hole 26 and is inserted into the connecting screw hole 43, and is connected to the connecting screw hole 43 by threads. Thus, due to the reaction force of the installation table 25, when the connecting screw 27 continues to be screwed into the connecting screw hole 43, the connecting cylinder 41 of the chuck 4 is forced to move axially backward, and at the same time, the clamping cylinder 42 is driven to move axially backward. Furthermore, the long conical section 23 compresses the plurality of clamping sub-cylinders 44 of the clamping cylinder 42 to further clamp and fix the tool 3. At the same time, the runout accuracy of the tool 3 is adjusted through the cooperation of the connecting screw 27 and the long conical section 23.

[0043] Specifically, a through second cooling cavity 28 is formed in the middle of the connecting screw 27. Through the second cooling cavity 28, the high-pressure coolant flowing in from the first cooling cavity 51 can flow into the connecting cylinder 41 of the chuck 4, and then flow into the tool 3, further improving the cooling effect of the tool 3.

[0044] Although the specific implementation manners of the utility model have been described in detail in conjunction with the accompanying drawings, it should not be construed as a limitation on the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative efforts still fall within the protection scope of this patent.

Claims

1. An internally cooled and rear-pulled extension rod, characterized in that: It includes an extension rod body (1), and a through cavity (2) is formed inside the extension rod body (1); The through cavity (2) includes a connected installation section (21) and an adjustment section (22); a cutter (3) is fixedly installed at the opening of the installation section (21) through a chuck (4); an adjustment screw (5) is inserted through the opening of the adjustment section (22), a through first cooling cavity (51) is formed in the middle of the adjustment screw (5), and the tail end of the first cooling cavity (51) is communicated with external coolant.

2. The internally cooled rear-drawn extension rod according to claim 1, characterized in that: The chuck (4) includes a connected connection cylinder (41) and a clamping cylinder (42); a connection screw hole (43) is formed inside the connection cylinder (41); The clamping cylinder (42) includes a plurality of clamping sub-cylinders (44), and the plurality of clamping sub-cylinders (44) are arranged in a ring to form a cone and are connected to the connection cylinder (41); an installation channel is formed in the middle of the plurality of clamping sub-cylinders (44), the cutter (3) passes through the installation channel and is inserted into the connection screw hole (43) and is connected to the connection screw hole (43).

3. The internally cooled and rear-pulled extension rod according to claim 2, wherein: The installation section (21) includes a connected long cone section (23) and a straight cylinder section (24); the connection cylinder (41) of the chuck (4) is embedded in the straight cylinder section (24), the clamping cylinder (42) falls into the long cone section (23), and the conical surface of the long cone section (23) fits with the conical surface of the clamping cylinder (42).

4. The internally cooled and rear-drawn extension rod according to claim 3, wherein: An installation table (25) is arranged between the installation section (21) and the adjustment section (22), and a through hole (26) is formed in the middle of the installation table (25); a connection screw (27) is inserted into the through hole (26), the connection screw (27) passes through the through hole (26) and is inserted into the connection screw hole (43) and is connected to the connection screw hole (43).

5. The internally cooled and rear-drawn extension rod according to claim 4, wherein: A through second cooling cavity (28) is formed in the middle of the connection screw (27).

6. The internally cooled and rear-pulled extension rod according to claim 1, characterized in that: A locking nut (52) is arranged on the adjustment screw (5).

7. The internally cooled rear-pulled extension rod according to claim 1, characterized in that: A clamping table surface (11) is arranged on the extension rod body (1).

8. The internally cooled and rear-pulled extension rod according to claim 1, wherein: A sealing ring (53) is arranged at the opening of the first cooling cavity (51).

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