Disc tailstock of numerical control machine tool

Abstract

The utility model discloses a disc tailstock of a numerical control machine tool. The disc tailstock comprises a shell, a rotating shaft, a bearing, a rotating disc and a brake mechanism. The shell comprises a shell body, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are assembled on two opposite end sides of the shell body respectively. The rotating shaft is supported in the shell main body through a bearing; one tail end of the rotating shaft extends out of the front end cover and then is fixedly connected with the turntable; an abutting part is convexly arranged on the inner side wall of the shell main body towards the central axis of the rotating shaft, and a limiting flange is convexly arranged on the rotating shaft towards the abutting part; the brake mechanism comprises a brake pad and a brake linkage device used for braking the brake pad towards the abutting portion, the brake pad is arranged on the rotating shaft in a sleeving mode, the inner circle end of the brake pad is fixed to the limiting flange in an abutting mode, a first avoiding gap is formed between the outer circle end of the brake pad and the abutting portion, and the brake linkage device is fixed to the inner side face of the rear end cover. The specific structure and the assembly structure of the brake mechanism are optimized, so that the brake mechanism is reliable in structure and convenient to replace and maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to a disc tailstock of a numerical control machine tool. Background Art

[0002] The disc tailstock is used on CNC machine tools, and cooperates with the fixture of the CNC machine tool to fix the workpiece and drive the workpiece to rotate as needed during the processing. The main structure of the disc tailstock includes a housing, a rotating shaft fixed in the housing through bearing support, a turntable fixed at one end of the rotating shaft, and a brake mechanism provided between the rotating shaft and the housing. However, the overall structure of the existing disc tailstock is relatively complex, and the structural design of the brake mechanism in the disc tailstock is unreasonable, resulting in the need to remove the bearings first when replacing and maintaining the brake mechanism in the later stage, and reinstall the bearings after replacing and repairing the brake mechanism, and re-measure the assembly parameters such as the end diameter runout and tolerance of the rotating shaft to ensure the rotation accuracy of the rotating shaft, which makes the replacement and maintenance of the brake mechanism very inconvenient. Utility Model Content

[0003] The utility model provides a disc tailstock of a numerically controlled machine tool, aiming to at least solve the technical problem that the existing disc tailstock has an unreasonable structural design and a brake mechanism that is inconvenient to replace and maintain.

[0004] The utility model proposes a disc tailstock of a numerically controlled machine tool, the disc tailstock comprises a shell, a rotating shaft, a bearing, a turntable and a brake mechanism; the shell comprises a shell body, a front end cover and a rear end cover respectively assembled on two opposite end sides of the shell body; the rotating shaft is arranged in the shell body through a bearing support, and one end of the rotating shaft is fixedly connected to the turntable after extending out of the front end cover; an abutment portion is convexly provided on the inner side wall of the shell body toward the central axis of the rotating shaft, and a limiting flange is convexly provided on the rotating shaft toward the abutment portion; the bearing is arranged on one end side of the limiting flange, and an installation cavity is provided between the other end side of the limiting flange and the rear end cover, and the brake mechanism is arranged in the installation cavity; the brake mechanism comprises a brake pad and a brake linkage device for braking the brake pad toward the abutment portion, the brake pad is sleeved on the rotating shaft, the inner circular end of the brake pad is abutted and fixed to the limiting flange, a first avoidance gap is provided between the outer circular end of the brake pad and the abutment portion, and the brake linkage device is fixed to the inner side surface of the rear end cover.

[0005] In some preferred embodiments, the rotating shaft includes a first rotating shaft and a second rotating shaft coaxially connected; the limiting flange is arranged at the end of the first rotating shaft, and one end of the second rotating shaft is coaxially connected to the first rotating shaft through the limiting flange.

[0006] In some preferred embodiments, a first oil seal is provided between the first rotating shaft and the front end cover, and a second oil seal is provided between the end of the first rotating shaft and the rear end cover.

[0007] In some preferred embodiments, the bearing is fixed between the first rotating shaft and the housing body, and the rotating portion of the bearing abuts against one end side of the limiting flange.

[0008] In some preferred embodiments, the brake linkage device includes a brake disc, a limiting disc and an elastic member; the inner circular end of the limiting disc close to the rotating shaft is fixedly connected to the rear end cover; the inner circular end of the brake disc close to the rotating shaft is located in the assembly distance between the outer circular end of the limiting disc and the rear end cover, and the outer circular end of the brake disc is provided with a brake part, and when the brake linkage device does not brake the brake pad, there is a second avoidance gap between the brake part and the brake pad; the elastic member is limited between the inner circular end of the brake disc and the outer circular end of the limiting disc to generate an elastic force for the brake part to move away from the brake pad.

[0009] In some preferred embodiments, the inner side surface of the rear end cover has an annular boss protruding around the rotating axis toward the limiting flange, the inner circular end of the limiting disc is fixed on the annular boss, and an assembly spacing for installing the brake disc is formed between the outer circular end of the limiting disc and the rear end cover.

[0010] In some preferred embodiments, the brake linkage device further includes an air passage arranged on the rear end cover and an air pressure chamber located between the rear end cover and the brake disc, and the end of the air passage is connected to the air pressure chamber.

[0011] In some preferred embodiments, a plurality of sealing rings are provided between the rear end cover and the brake disc and are located on the outer peripheral side of the air pressure chamber.

[0012] In some preferred embodiments, the limiting disc is provided with a plurality of mounting grooves, one end of a plurality of elastic members is correspondingly arranged in one of the mounting grooves, and the other end of the elastic member abuts against the limiting disc.

[0013] In some preferred embodiments, the limiting disc is provided with a plurality of limiting grooves; the brake disc is provided with a plurality of limiting blocks, the ends of the limiting blocks are located in the limiting grooves to limit the rotation of the brake disc when braking the brake pad.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] Since the bearing is arranged at one end of the limiting flange, a mounting cavity is formed between the other end of the limiting flange and the rear end cover, and the brake mechanism is arranged in the mounting cavity. When the brake mechanism needs to be inspected, replaced, and maintained, it is only necessary to remove the rear end cover from the end of the shell body, and there is no need to remove precision parts such as bearings, so it is very convenient to inspect, replace, and maintain the brake mechanism, and it does not require re-measurement to determine the end diameter runout and tolerance of the rotating shaft to ensure the rotation accuracy of the rotating shaft. In addition, the brake structure is simple and reliable; the overall structure of the disc tailstock is compact and the rotation accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the disc tailstock.

[0017] Figure 2 It is one of the internal structure diagrams of the disc tailstock.

[0018] Figure 3 yes Figure 2 A magnified schematic diagram of part A in the figure.

[0019] Figure 4 yes Figure 2 Enlarged schematic diagram of part B in the middle.

[0020] Figure 5 It is a structural schematic diagram of the limiting disc.

[0021] Figure 6 It is a structural diagram of the rear end cover.

[0022] Figure 7 It is a three-dimensional structural diagram of the brake disc. DETAILED DESCRIPTION

[0023] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0024] The utility model discloses a disc tailstock of a numerical control machine tool, which comprises a shell, a rotating shaft fixed in the shell through bearing support, a rotating disk fixed at one end of the rotating shaft, and a brake mechanism arranged between the rotating shaft and the shell.

[0025] Combination Figure 1-Figure 4As shown, the shell specifically includes a shell body 11 with a fixed base, a front end cover 12 and a rear end cover 13 respectively assembled on the two opposite end sides of the shell body 11; the rotating shaft is arranged in the shell body 11, and the rotating shaft 2 includes a first rotating shaft 21 and a second rotating shaft 22 coaxially connected, the first rotating shaft 21 extends out of the front end cover 12 away from the end of the second rotating shaft 22 and is fixedly connected to the turntable 4, and a first oil seal 14 is provided between the first rotating shaft 21 and the front end cover 12, and the second rotating shaft 22 extends out of the rear end cover 13 away from the end of the first rotating shaft 21, so that the end of the first rotating shaft 21 is connected to the driving source of the CNC machine tool to drive the rotating shaft 2 to rotate, and a second oil seal 15 is provided between the end of the first rotating shaft 21 and the rear end cover 13; the bearing 3 is arranged between the first rotating shaft 21 and the shell body 11, so that the rotating shaft can drive the turntable 4 to rotate as needed relative to the shell body 11 based on the support of the bearing 3.

[0026] A limiting flange 221 is provided at the end of the first rotating shaft 21, and one end of the second rotating shaft 22 is coaxially connected to the first rotating shaft 21 through the limiting flange 221. An abutment portion 111 is provided on the inner side wall of the housing body 11 toward the central axis of the rotating shaft 2, and the abutment portion 111 is arranged opposite to the limiting flange 221.

[0027] The bearing 3 is fixed between the first rotating shaft 21 and the shell body 11, and the rotating part of the bearing 3 abuts against one end side of the limiting flange 221. The rotating part of the bearing 3 is used to provide rotational support for the first rotating shaft 21 and the second rotating shaft 22 at the same time. When the end of the first rotating shaft 21 is connected to the driving source of the CNC machine tool to drive the rotating shaft 2 to rotate, it is beneficial to reduce the end jump error of the turntable 4 to improve the accuracy.

[0028] The turntable 4 is provided with a plurality of T-slots 41 , and the turntable 4 can be adapted to the installation requirements of workpieces of different specifications by using fixtures arranged at different positions of the T-slots 41 .

[0029] In addition, since the bearing 3 is arranged at one end of the limiting flange 221, a mounting cavity is formed between the other end of the limiting flange 221 and the rear end cover 13, and the brake mechanism is arranged in the mounting cavity. The advantage of this arrangement is that the mounting cavity can be exposed by opening the rear end cover 13, and the brake mechanism in the mounting cavity can be easily replaced and repaired without disassembling the bearing 3 and the rotating shaft 2.

[0030] Further integration Figure 2-Figure 7As shown, the brake mechanism specifically includes a brake pad 50 and a brake linkage device for braking the brake pad 50 toward the abutment portion 111. The brake pad 50 is sleeved on the first rotating shaft 21 of the rotating shaft 2, and the inner circular end of the brake pad 50 close to the first rotating shaft 21 is abutted and fixed to one end side of the limiting flange 221, and there is a first avoidance gap between the outer circular end of the brake pad 50 away from the first rotating shaft 21 and the abutment portion 111, so that when the brake linkage device does not brake the brake pad 50, the brake pad 50 will not interfere with the abutment portion 111 of the housing body 11 by using the first avoidance gap to affect the rotating shaft 2 to drive the rotating disk 4 to rotate; the brake linkage device is fixed to the inner side of the rear end cover 13.

[0031] The brake linkage device comprises a brake disc 51, a limiting disc 52 and an elastic member 53. The inner circular end of the limiting disc 52 close to the rotating shaft 2 is fixedly connected to the rear end cover 13; the inner circular end of the brake disc 51 close to the rotating shaft 2 is located in the assembly distance between the outer circular end of the limiting disc 52 and the rear end cover 13, and the outer circular end of the brake disc 51 is provided with a brake portion 511, and when the brake linkage device does not brake the brake pad 50, there is a second avoidance gap between the brake portion 511 and the brake pad 50; the elastic member 53 is limitedly arranged between the inner circular end of the brake disc 51 and the outer circular end of the limiting disc 52 to generate an elastic force for the brake portion 511 to be away from the brake pad 50.

[0032] The working principle of the brake linkage device to brake the brake pad 50 is as follows:

[0033] 1. When the brake linkage device does not brake the brake pad 50 , the brake disc 51 has a second avoidance gap between the brake portion 511 and the brake pad 50 under the elastic force of the elastic member 53 .

[0034] 2. When a braking external force is provided to the brake disc 51 to overcome the elastic force of the elastic member 53, the braking external force will push the brake disc 51 toward the brake pad 50 to make the second avoidance gap disappear. When the braking portion 511 of the brake disc 51 abuts against the brake pad 50, it will further push the brake pad 50 toward the abutting portion 111. When the brake pad 50 abuts and connects with the abutting portion 111, the first avoidance gap disappears, and friction is generated between the brake pad 50 and the abutting portion 111 to achieve braking, so that the rotating shaft 2 and the turntable 4 stop rotating.

[0035] 3. After the external braking force disappears, the brake disc 51 is reset under the elastic force of the elastic member 53, so that the brake pad 50 and the abutment portion 111 form a first avoidance gap, and the brake portion 511 and the brake pad 50 form a second avoidance gap, so that the rotating shaft 2 can drive the turntable 4 to rotate as needed.

[0036] Especially see Figure 6As shown, the inner side surface of the rear end cover 13 has an annular boss 132 protruding around the rotating shaft 2 toward the limiting flange 221, the inner circular end of the limiting disc 52 is fixed on the annular boss 132, and an assembly spacing for installing the brake disc 51 is formed between the outer circular end of the limiting disc 52 and the rear end cover 13.

[0037] In a preferred embodiment, air pressure is used to provide an external braking force to the brake disc 51. Specifically, the brake linkage device also includes an air passage 131 provided on the rear end cover 13 and an air pressure chamber 54 located between the rear end cover 13 and the brake disc 51, and the end of the air passage 131 is connected to the air pressure chamber 54. An air nozzle 133 is provided in the air passage 131 to connect with an external air source through the air nozzle 133, and the external air source injects gas into the air pressure chamber 54 through the air passage 131, so that the pressure in the air pressure chamber 54 increases, and the brake disc 51 is pushed to overcome the elastic force of the elastic member 53 and move toward the brake pad 50 to generate an external braking force. When the air pressure chamber 54 is lowered, the brake disc 51 is reset by the elastic member 53.

[0038] In order to ensure that the air pressure chamber 54 has reliable airtightness, a plurality of sealing rings 55 are provided between the rear end cover 13 and the brake disc 51 and are located on the outer circumference of the air pressure chamber 54 .

[0039] In addition, the limiting disc 52 is provided with a plurality of mounting grooves 521 , one end of the plurality of elastic members 53 is correspondingly disposed in one of the mounting grooves 521 , and the other end of the elastic member 53 abuts against the limiting disc 52 .

[0040] Furthermore, the limiting disc 52 is provided with a plurality of limiting grooves 522 ; the brake disc 51 is provided with a plurality of limiting blocks 512 , the ends of the limiting blocks 512 are located in the limiting grooves 522 to limit the rotation of the brake disc 51 when braking the brake pad 50 .

[0041] When the brake mechanism needs to be inspected, replaced or maintained, it is only necessary to remove the rear end cover 13 from the end side of the shell body 11, and there is no need to remove precision parts such as the bearing 3. This makes it very convenient to inspect, replace or maintain the brake mechanism, and there is no need to re-measure and determine the end diameter runout and tolerance of the rotating shaft 2 to ensure the rotation accuracy of the rotating shaft 2.

[0042] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A disk tailstock for a numerically controlled machine tool, the disk tailstock comprising a housing, a rotating shaft (2), a bearing (3), a turntable (4) and a brake mechanism; the housing comprising a housing body (11), a front end cover (12) and a rear end cover (13) respectively mounted on two opposite end sides of the housing body (11); the rotating shaft (2) is supported and arranged in the housing body (11) through the bearing (3), and one end of the rotating shaft (2) extends out of the front end cover (12) and is fixedly connected to the turntable (4); the characteristics are: An abutment portion (111) is protrudingly provided on the inner side wall of the housing body (11) towards the central axis of the rotating shaft (2), and a limiting flange (221) is protrudingly provided on the rotating shaft (2) towards the abutment portion (111); The bearing (3) is arranged on one end side of the limiting flange (221), and a mounting cavity is provided between the other end side of the limiting flange (221) and the rear end cover (13), and the brake mechanism is arranged in the mounting cavity; The brake mechanism comprises a brake pad (50) and a brake linkage device for braking the brake pad (50) toward the abutment portion (111); the brake pad (50) is sleeved on the rotating shaft (2); the inner circular end of the brake pad (50) is abutted and fixed to the limiting flange (221); a first avoidance gap is provided between the outer circular end of the brake pad (50) and the abutment portion (111); and the brake linkage device is fixed to the inner side surface of the rear end cover (13).

2. The disc tailstock according to claim 1, characterized in that: The rotating shaft (2) comprises a first rotating shaft (21) and a second rotating shaft (22) which are coaxially connected; a limiting flange (221) is arranged at the end of the first rotating shaft (21), and one end of the second rotating shaft (22) is coaxially connected to the first rotating shaft (21) via the limiting flange (221).

3. The disc tailstock according to claim 2, characterized in that: A first oil seal (14) is provided between the first rotating shaft (21) and the front end cover (12), and a second oil seal (15) is provided between the end of the first rotating shaft (21) and the rear end cover (13).

4. The disc tailstock according to claim 2, characterized in that: The bearing (3) is fixed between the first rotating shaft (21) and the housing body (11), and the rotating portion of the bearing (3) abuts against one end side of the limiting flange (221).

5. The disc tailstock according to any one of claims 1 to 4, characterized in that: The brake linkage device comprises a brake disc (51), a limit disc (52) and an elastic member (53); The inner circular end of the limiting disc (52) close to the rotating shaft (2) is fixedly connected to the rear end cover (13); The inner circular end of the brake disc (51) close to the rotating shaft (2) is located within the assembly spacing between the outer circular end of the limiting disc (52) and the rear end cover (13), and the outer circular end of the brake disc (51) is provided with a brake portion (511), and when the brake linkage device does not brake the brake pad (50), a second avoidance gap is provided between the brake portion (511) and the brake pad (50); The elastic member (53) is limitedly disposed between the inner circular end of the brake disc (51) and the outer circular end of the limiting disc (52) to generate an elastic force for the brake portion (511) to move away from the brake pad (50).

6. The disc tailstock according to claim 5, characterized in that: The inner side surface of the rear end cover (13) has an annular boss (132) which is protruded around the rotating shaft (2) and toward the limiting flange (221); the inner circular end of the limiting disc (52) is fixed on the annular boss (132); and an assembly spacing for mounting the brake disc (51) is formed between the outer circular end of the limiting disc (52) and the rear end cover (13).

7. The disc tailstock according to claim 5, characterized in that: The brake linkage device further comprises an air passage (131) arranged on the rear end cover (13) and an air pressure chamber (54) located between the rear end cover (13) and the brake disc (51), wherein the end of the air passage (131) is in communication with the air pressure chamber (54).

8. The disc tailstock according to claim 7, characterized in that: A plurality of sealing rings (55) are provided between the rear end cover (13) and the brake disc (51) and are located on the outer peripheral side of the air pressure chamber (54).

9. The disc tailstock according to claim 5, characterized in that: The limiting disc (52) is provided with a plurality of mounting grooves (521), one end of the plurality of elastic members (53) is correspondingly arranged in one of the mounting grooves (521), and the other end of the elastic member (53) is in contact with the limiting disc (52).

10. The disc tailstock according to claim 5, characterized in that: The limiting disc (52) is provided with a plurality of limiting grooves (522); the brake disc (51) is provided with a plurality of limiting blocks (512), and the ends of the limiting blocks (512) are located in the limiting grooves (522) to limit the rotation of the brake disc (51) when braking the brake pad (50).

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