Centre main shaft structure combined with liquid expansion technology

Abstract

The utility model relates to a center main shaft structure combined with a liquid expansion technology. The technical problem that the static precision of the main shaft cannot be improved in the prior art is solved. Comprising a main shaft cylinder, a shaft core body is rotationally arranged on the inner side of the circumferential direction of the main shaft cylinder in a penetrating mode through a rotary mounting structure, a connecting part is arranged at one end of the shaft core body, and a main shaft head coaxial with the shaft core body is fixedly inserted into the connecting part; a hydraulic expansion assembly capable of enabling the shaft core body to be circumferentially fixed relative to the main shaft barrel is arranged on the circumferential outer side of the end, away from the connecting part, of the shaft core body. The device has the advantages that the hydraulic expansion assembly is installed on the center main shaft, good tail end retaining force can be provided for the tail end of the center main shaft in the using process, meanwhile, the retaining rigidity of the shaft core body and the static precision of the main shaft head can be improved, and the hydraulic expansion sleeve has good static precision retaining performance; the radial precision within 0.001 mm can be realized after use, the installation is convenient, the maintenance is avoided, and the cost is low at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of top spindle equipment, and in particular relates to a top spindle structure combined with a liquid expansion technology. Background Art

[0002] The top pressure spindle is mainly used for machining shaft parts on lathes. With the help of center hole positioning, the workpiece can obtain high dimensional accuracy. When the traditional top spindle needs to be locked and not rotated, there are usually the following methods: installing a brake disc at the tail end of the spindle, end gear disc locking method and electromagnetic brake method, but these methods cannot improve the static accuracy of the spindle. The static accuracy can only be maintained by the spindle inner bearing and because most of them are external, they are easily affected by external impurities and water vapor to affect the stability of use. At the same time, there are spindle angle positioning requirements, which leads to high costs. Summary of the invention

[0003] The purpose of the utility model is to provide a top spindle structure combined with liquid expansion technology in order to solve the above problems.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a top spindle structure combined with liquid expansion technology, including a spindle cylinder, a shaft core body is rotatably penetrated on the inner side of the spindle cylinder through a rotating mounting structure, one end of the shaft core body is provided with a connecting portion, and a spindle head coaxially arranged with the shaft core body is inserted and fixed in the connecting portion, and a hydraulic expansion assembly that can fix the shaft core body relative to the spindle cylinder in the circumferential direction of one end of the shaft core body away from the connecting portion is provided; the spindle head is arranged in the connecting portion of the shaft core body, and the shaft core body is installed in the spindle cylinder. Inside the shaft cylinder, a hydraulic expansion assembly is arranged between the shaft core and the spindle cylinder, which can provide good holding force for the spindle head, improve the holding rigidity of the shaft core and improve the static accuracy of the spindle head; the hydraulic expansion assembly includes a hydraulic expansion sleeve, and the hydraulic expansion sleeve has an expansion sleeve flange and an expansion sleeve coaxially connected to the expansion sleeve flange. One end of the shaft core is sequentially inserted through the expansion sleeve and the expansion sleeve flange and extends to the outside of the spindle cylinder. The expansion sleeve flange is connected to the spindle cylinder through the expansion sleeve fixing assembly. The expansion sleeve flange is used to be connected to the spindle cylinder, and the expansion sleeve is arranged between the spindle cylinder and the shaft core, and is used to squeeze and fix the shaft core.

[0005] In the above-mentioned top spindle structure combined with the hydraulic expansion technology, the expansion sleeve part is made of a deformable material, the inner wall of the expansion sleeve part is provided with a hydraulic expansion cavity extending along the axial direction of the expansion sleeve part and in an annular shape, and the circumferential outer side of the expansion sleeve flange part is provided with a pressure supply interface connected to the hydraulic expansion cavity. The hydraulic oil is delivered to the hydraulic expansion cavity through the pressure supply interface, so that the expansion sleeve part can be deformed, thereby achieving the function of extrusion and fixing.

[0006] In the above-mentioned top spindle structure combined with the hydraulic expansion technology, the expansion sleeve part and the expansion sleeve flange part are connected as an integrated structure, the expansion sleeve part has an outer expansion surface corresponding to the inner circumferential side of the spindle barrel on the circumferential outer side, and the expansion sleeve part has an inner expansion surface corresponding to the outer circumferential side of the shaft core on the circumferential inner side, the expansion sleeve part is a double-layer structure with an inner sleeve and an outer sleeve coaxially arranged, and the end of the inner sleeve away from the expansion sleeve flange part and the end of the outer sleeve away from the expansion sleeve flange part are mutually sealed to form the above-mentioned hydraulic expansion cavity between the inner sleeve and the outer sleeve. Hydraulic oil enters the hydraulic expansion cavity, causing the outer expansion surface to move toward the spindle barrel and the inner expansion surface to move toward the shaft core, thereby forming extrusion.

[0007] In the above-mentioned top spindle structure combined with the hydraulic expansion technology, the expansion sleeve fixing assembly includes a plurality of mounting holes circumferentially arranged on the expansion sleeve flange, and a plurality of fixing holes corresponding to the mounting holes are arranged on one end surface of the spindle barrel, and the mounting holes are connected to the fixing holes by mounting bolts. This is to ensure that the hydraulic expansion sleeve does not loosen or detach from the spindle barrel during use, thereby reducing the risk factor.

[0008] In the above-mentioned top spindle structure combined with liquid expansion technology, the rotating installation structure includes a first rotating installation assembly arranged between the circumferential outer side of one end of the shaft core body having the connecting portion and the circumferential inner side of the spindle cylinder, and a second rotating installation assembly is arranged between the circumferential outer side of the other end of the shaft core body and the circumferential inner side of the spindle cylinder. The shaft core body rotates circumferentially in the spindle cylinder through the first rotating installation assembly and the second rotating installation assembly.

[0009] In the above-mentioned top spindle structure combined with liquid expansion technology, the first rotating mounting assembly includes a first rolling bearing arranged on the circumferential outer side of the connecting part, a first washer is provided at one end of the first rolling bearing, and a first limiting ring is provided on the circumferential outer side of the first washer to abut against the first rolling bearing.

[0010] In the above-mentioned top spindle structure combined with liquid expansion technology, the end of the first rolling bearing away from the first washer is provided with a positioning flange connected to the end of the spindle cylinder, the circumferential inner side of the positioning flange is provided with a positioning washer abutting against the end of the first rolling bearing away from the first washer, and the end of the positioning flange away from the spindle cylinder is also provided with a spindle cover.

[0011] In the above-mentioned top spindle structure combined with liquid expansion technology, the second rotating mounting assembly includes a second rolling bearing arranged on the circumferential outer side of the middle part of the shaft core body, a second limiting ring is provided at one end of the second rolling bearing, and a second washer is provided at the end of the second limiting ring away from the second rolling bearing.

[0012] In the above-mentioned top spindle structure combined with liquid expansion technology, the outer circumferential side of the connecting part is a conical structure, the inner circumferential side of the connecting part is provided with a connecting groove, and the inner wall of the connecting groove is provided with an inclined surface corresponding to the outer side of the spindle head.

[0013] Compared with the existing technology, the advantages of the utility model are:

[0014] 1. The device installs a hydraulic expansion assembly on the top spindle, which can provide good end holding force for the end of the top spindle when used, while improving the holding rigidity of the shaft core and the static accuracy of the spindle head.

[0015] 2. The hydraulic expansion sleeve of the device is deformed by hydraulic oil, and the outer expansion surface and the inner expansion surface are respectively pressed against the main shaft cylinder and the shaft core body, thereby fixing the shaft core body.

[0016] 3. The hydraulic expansion sleeve of the device has good static accuracy retention. After use, the radial accuracy can be achieved within 0.001mm. It is easy to install, maintenance-free and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a structural sectional view of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the main shaft cylinder in the utility model.

[0020] Figure 4 It is a structural schematic diagram of the central axis core of the utility model.

[0021] Figure 5 It is a structural sectional view of the central axis core of the utility model.

[0022] Figure 6 It is a structural schematic diagram of the hydraulic expansion sleeve in the utility model.

[0023] Figure 7 It is an internal sectional view of the hydraulic expansion sleeve in the utility model.

[0024] In the figure: spindle cylinder 1, rotation installation structure 2, shaft core body 3, connecting part 31, spindle head 32, connecting groove 33, inclined surface 34, hydraulic expansion assembly 4, hydraulic expansion sleeve 41, expansion sleeve flange part 42, expansion sleeve part 43, hydraulic expansion cavity 44, pressure supply interface 45, outer expansion surface 46, inner expansion surface 47, inner sleeve 48, outer sleeve 49, expansion sleeve fixing assembly 5, mounting hole 51, fixing hole 52, first rotation installation assembly 6, first rolling bearing 61, first gasket 62, first limit ring 63, positioning flange 64, positioning gasket 65, spindle cover 66, second rotation installation assembly 7, second limit ring 72, second rolling bearing 71, second gasket 73. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1-7 As shown, a top spindle structure combined with liquid expansion technology includes a spindle barrel 1, a shaft core body 3 is rotatably penetrated through the circumferential inner side of the spindle barrel 1 through a rotating mounting structure 2, a connecting portion 31 is provided at one end of the shaft core body 3, and a spindle head 32 coaxially arranged with the shaft core body 3 is inserted and fixed in the connecting portion 31, and a hydraulic expansion assembly 4 that can fix the shaft core body 3 circumferentially relative to the spindle barrel 1 is provided at one end of the shaft core body 3 away from the connecting portion 31. The spindle head 32 is arranged in the connecting portion 31 of the shaft core body 3, and the shaft core body 3 is installed inside the spindle barrel 1. The hydraulic expansion assembly 4 is arranged between the shaft core body 3 and the spindle barrel 1, which can provide a good holding force for the spindle head 32, improve the holding rigidity of the shaft core body 3, and improve the static accuracy of the spindle head 32.

[0027] like Figure 6 As shown, the hydraulic expansion assembly 4 includes a hydraulic expansion sleeve 41, and the hydraulic expansion sleeve 41 has an expansion sleeve flange part 42 and an expansion sleeve part 43 coaxially connected to the expansion sleeve flange part 42, one end of the shaft core body 3 is sequentially penetrated through the expansion sleeve part 43 and the expansion sleeve flange part 42 and extends to the outside of the main shaft cylinder 1, and the expansion sleeve flange part 42 is connected to the main shaft cylinder 1 through the expansion sleeve fixing assembly 5. The expansion sleeve flange part 42 is used to be connected to the main shaft cylinder 1, and the expansion sleeve part 43 is arranged between the main shaft cylinder 1 and the shaft core body 3, and is used to squeeze and fix the shaft core body 3.

[0028] The expansion sleeve portion 43 is made of a deformable material, and an annular hydraulic expansion cavity 44 extending along the axial direction of the expansion sleeve portion 43 is provided in the inner wall of the expansion sleeve portion 43, and a pressure supply interface 45 communicating with the hydraulic expansion cavity 44 is provided on the circumferential outer side of the expansion sleeve flange portion 42. The hydraulic oil is delivered to the hydraulic expansion cavity 44 through the pressure supply interface 45, so that the expansion sleeve portion 43 can be deformed, thereby achieving the function of extrusion and fixing.

[0029] Combination Figure 2 and Figure 7 As shown, the expansion sleeve part 43 and the expansion sleeve flange part 42 are connected as an integral structure, the expansion sleeve part 43 has an outer expansion surface 46 corresponding to the inner side of the main shaft cylinder 1 on the circumferential outer side, and the expansion sleeve part 43 has an inner expansion surface 47 corresponding to the outer side of the shaft core 3 on the circumferential inner side, the expansion sleeve part 43 has a double-layer structure with an inner sleeve 48 and an outer sleeve 49 coaxially arranged, and the end of the inner sleeve 48 away from the expansion sleeve flange part 42 and the end of the outer sleeve 49 away from the expansion sleeve flange part 42 are mutually sealed, so as to form the above-mentioned hydraulic expansion chamber 44 between the inner sleeve 48 and the outer sleeve 49. The hydraulic oil enters the hydraulic expansion chamber 44, so that the outer expansion surface 46 moves toward the main shaft cylinder 1 and the inner expansion surface 47 moves toward the shaft core 3, thereby forming extrusion.

[0030] Combination Figure 3 and Figure 6 As shown, the expansion sleeve fixing assembly 5 includes a plurality of mounting holes 51 circumferentially arranged on the expansion sleeve flange portion 42, and a plurality of fixing holes 52 corresponding to the mounting holes 51 are arranged on one end surface of the spindle cylinder 1, and the mounting holes 51 are connected to the fixing holes 52 by mounting bolts. In order to ensure that the hydraulic expansion sleeve 41 does not loosen or detach from the spindle cylinder 1 during use, the risk factor is reduced.

[0031] like Figure 2 As shown, the rotating installation structure 2 includes a first rotating installation assembly 6 arranged between the circumferential outer side of one end of the shaft core body 3 having the connecting portion 31 and the circumferential inner side of the spindle barrel body 1, and a second rotating installation assembly 7 is arranged between the circumferential outer side of the other end of the shaft core body 3 and the circumferential inner side of the spindle barrel body 1. The shaft core body 3 rotates circumferentially in the spindle barrel body 1 through the first rotating installation assembly 6 and the second rotating installation assembly 7.

[0032] The first rotating mounting assembly 6 comprises a first rolling bearing 61 arranged on the outer side of the connecting portion 31 , a first washer 62 is arranged at one end of the first rolling bearing 61 , and a first limiting ring 63 abutting against the first rolling bearing 61 is arranged on the outer side of the first washer 62 .

[0033] Specifically, a positioning flange 64 connected to the end of the spindle cylinder 1 is provided at the end of the first rolling bearing 61 away from the first washer 62, a positioning washer 65 abutting against the end of the first rolling bearing 61 away from the first washer 62 is provided on the inner side of the positioning flange 64, and a spindle cover 66 is also provided at the end of the positioning flange 64 away from the spindle cylinder 1.

[0034] Furthermore, the second rotating mounting assembly 7 includes a second rolling bearing 71 arranged on the circumferential outer side of the middle part of the shaft core body 3, a second limiting ring 72 is provided at one end of the second rolling bearing 71, and a second washer 73 is provided at one end of the second limiting ring 72 away from the second rolling bearing 71.

[0035] Combination Figure 4 and Figure 5 As shown, the connecting portion 31 is in a conical structure on the outer side in the circumferential direction, a connecting groove 33 is provided on the inner side in the circumferential direction of the connecting portion 31 , and an inclined surface 34 corresponding to the outer side of the spindle head 32 is provided on the inner wall of the connecting groove 33 .

[0036] The principle of this embodiment is:

[0037] The spindle head 32 is arranged in the connecting part 31 of the shaft core body 3. The shaft core body 3 is movably arranged in the spindle barrel 1 through the first rotating mounting assembly 6 and the second rotating mounting assembly 7. A hydraulic expansion sleeve 41 is installed at the end of the spindle barrel 1 and the shaft core body 3 away from the spindle head 32. The expansion sleeve part 43 is arranged between the spindle barrel 1 and the shaft core body 3. Hydraulic oil is transported to the hydraulic expansion cavity 44 through the pressure supply interface 45. Then, the expansion sleeve part 43 deforms the outer expansion surface 46 and the inner expansion surface 47 toward the outside through the hydraulic oil, thereby squeezing the spindle barrel 1 and the shaft core body 3, thereby achieving the function of fixing the spindle head 32 and improving the static accuracy of the spindle head 32.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0039] Although the terms such as spindle barrel 1, rotating mounting structure 2, shaft core 3, connecting part 31, spindle head 32, connecting groove 33, inclined surface 34, hydraulic expansion assembly 4, hydraulic expansion sleeve 41, expansion sleeve flange part 42, expansion sleeve part 43, hydraulic expansion cavity 44, pressure supply interface 45, outer expansion surface 46, inner expansion surface 47, inner sleeve 48, outer sleeve 49, expansion sleeve fixing assembly 5, mounting hole 51, fixing hole 52, first rotating mounting assembly 6, first rolling bearing 61, first washer 62, first limiting ring 63, positioning flange 64, positioning washer 65, spindle cover 66, second rotating mounting assembly 7, second limiting ring 72, second rolling bearing 71, second washer 73 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A top spindle structure combined with liquid expansion technology, comprising a spindle cylinder (1), wherein an axial core (3) is rotatably penetrated through the inner side of the spindle cylinder (1) via a rotating mounting structure (2), wherein one end of the axial core (3) is provided with a connecting portion (31) and a spindle head (32) coaxially arranged with the axial core (3) is inserted and fixed in the connecting portion (31), characterized in that: A hydraulic expansion assembly (4) is provided on the circumferential outer side of one end of the shaft core body (3) away from the connecting portion (31) to fix the shaft core body (3) circumferentially relative to the main shaft cylinder (1); The hydraulic expansion assembly (4) comprises a hydraulic expansion sleeve (41), and the hydraulic expansion sleeve (41) has an expansion sleeve flange portion (42) and an expansion sleeve portion (43) coaxially connected to the expansion sleeve flange portion (42); one end of the shaft core body (3) is successively passed through the expansion sleeve portion (43) and the expansion sleeve flange portion (42) and extends to the outside of the main shaft cylinder (1); the expansion sleeve flange portion (42) is connected to the main shaft cylinder (1) through an expansion sleeve fixing assembly (5).

2. A top spindle structure combined with liquid swelling technology according to claim 1, characterized in that: The expansion sleeve portion (43) is made of a deformable material, and an annular hydraulic expansion chamber (44) is provided in the inner wall of the expansion sleeve portion (43) and is axially extended along the expansion sleeve portion (43). The expansion sleeve flange portion (42) is provided with a pressure supply interface (45) connected to the hydraulic expansion chamber (44) on the circumferential outer side.

3. A top spindle structure combined with liquid swelling technology according to claim 2, characterized in that: The expansion sleeve portion (43) and the expansion flange portion (42) are connected as an integral structure, the expansion sleeve portion (43) has an outer expansion surface (46) on the circumferential outer side corresponding to the circumferential inner side of the main shaft cylinder (1), and the expansion sleeve portion (43) has an inner expansion surface (47) on the circumferential inner side corresponding to the circumferential outer side of the shaft core body (3), the expansion sleeve portion (43) is a double-layer structure with an inner sleeve (48) and an outer sleeve (49) coaxially arranged, and the end of the inner sleeve (48) away from the expansion flange portion (42) and the end of the outer sleeve (49) away from the expansion flange portion (42) are sealed to each other, thereby forming the above-mentioned hydraulic expansion chamber (44) between the inner sleeve (48) and the outer sleeve (49).

4. A top spindle structure combined with liquid swelling technology according to claim 1, 2 or 3, characterized in that: The expansion sleeve fixing assembly (5) comprises a plurality of mounting holes (51) circumferentially arranged on the expansion sleeve flange portion (42); a plurality of fixing holes (52) arranged one-to-one corresponding to the mounting holes (51) are provided on an end surface of one end of the spindle cylinder (1); and the mounting holes (51) are connected to the fixing holes (52) via mounting bolts.

5. The top spindle structure combined with liquid swelling technology according to claim 1, characterized in that: The rotating mounting structure (2) comprises a first rotating mounting assembly (6) arranged between the circumferential outer side of one end of the shaft core body (3) having a connecting portion (31) and the circumferential inner side of the main shaft cylinder body (1), and a second rotating mounting assembly (7) is arranged between the circumferential outer side of the other end of the shaft core body (3) and the circumferential inner side of the main shaft cylinder body (1).

6. A top spindle structure combined with liquid swelling technology according to claim 5, characterized in that: The first rotating mounting assembly (6) comprises a first rolling bearing (61) arranged on the circumferential outer side of the connecting portion (31), a first washer (62) being provided at one end of the first rolling bearing (61), and a first limiting ring (63) abutting against the first rolling bearing (61) being provided on the circumferential outer side of the first washer (62).

7. The top spindle structure combined with liquid swelling technology according to claim 6, characterized in that: The end of the first rolling bearing (61) away from the first gasket (62) is provided with a positioning flange (64) connected to the end of the main shaft cylinder (1); the inner side of the positioning flange (64) is provided with a positioning gasket (65) abutting against the end of the first rolling bearing (61) away from the first gasket (62); the end of the positioning flange (64) away from the main shaft cylinder (1) is also provided with a main shaft cover (66).

8. The top spindle structure combined with liquid swelling technology according to claim 5, characterized in that: The second rotating mounting assembly (7) comprises a second rolling bearing (71) arranged on the circumferential outer side of the middle part of the shaft core body (3), a second limiting ring (72) is provided at one end of the second rolling bearing (71), and a second washer (73) is provided at one end of the second limiting ring (72) away from the second rolling bearing (71).

9. The top spindle structure combined with liquid swelling technology according to claim 1, characterized in that: The connecting portion (31) is in a conical structure on the circumferential outer side, a connecting groove (33) is provided on the circumferential inner side of the connecting portion (31), and an inclined surface (34) corresponding to the outer side of the spindle head (32) is provided on the inner wall of the connecting groove (33).

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