Rotary table device, rotary table assembly and machining center

Abstract

The utility model relates to the field of machine tool structures, in particular to a rotary table device, a rotary table assembly and a machining center, which comprise a rotary body, a positioning matching part arranged on the rotary body and used for being matched with a working table in a positioning mode, a first air channel provided with a ventilation opening is arranged in the positioning matching part, and in actual use, air is supplied into the first air channel, and the first air channel is communicated with the working table. The airflow flows out from the opening of the vent hole, so that scrap iron and other sundries on the positioning matching part can be blown away through the airflow, and meanwhile, the effect of preventing the scrap iron and other sundries from falling on the positioning matching part can be achieved. And under the action of the first air channel, the influence of scrap iron and other sundries is reduced, so that the revolving body can be well assembled with a working table.

Description

Technical Field

[0001] The utility model relates to the field of machine tool structures, in particular to a turntable device, a turntable assembly and a machining center. Background Art

[0002] The turntable is a rotating mechanism commonly used in four-axis or five-axis machine tools. The turntable clamps the workpiece to facilitate processing of the workpiece.

[0003] In the prior art, a turntable includes a rotating body and a workbench. When replacing the workbench on the rotating body, in order to enable the workbench to be more accurately installed on the rotating body, a positioning pin is usually provided on the rotating body. For example, in Chinese patent CN109623416A, a positioning sleeve is provided on the workbench and a connecting sleeve is provided on the rotating body. In order to ensure that the workbench and the rotating body are well assembled, a positioning pin for positioning the workbench can be provided on the rotating body. However, when the positioning pin is provided on the rotating body, iron filings or other debris may fall onto its end surface, so that when the workbench and the rotating body are assembled, the iron filings or other debris on the positioning pin will resist the workbench, thereby affecting the assembly accuracy between the workbench and the rotating body.

[0004] Therefore, the prior art still has deficiencies and needs to be improved. Utility Model Content

[0005] To solve the above problems, the purpose of the utility model is to provide a turntable device, a turntable assembly and a machining center to solve the technical problem that possible iron filings or debris on the existing rotating body affect the assembly accuracy between the workbench and the rotating body.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The utility model provides a turntable device, comprising:

[0008] A rotating body, wherein a positioning matching portion for positioning and matching with a workbench is provided on the top surface of the rotating body, a first air passage for connecting with a positive pressure air source is provided in the positioning matching portion, the first air passage comprises a ventilation opening for ejecting air flow outward, and the ventilation opening is located on the end surface of the positioning matching portion;

[0009] A plurality of first fixed matching seats arranged in a ring shape and used for matching and positioning with the workbench are arranged on the top surface of the rotating body.

[0010] In one embodiment, the positioning matching part includes a positioning piece and a positioning seat that provides positioning for the positioning piece. The positioning seat is arranged on the top surface of the rotating body, the positioning piece is inserted into the positioning seat, the positioning seat is connected to the positive pressure air source, and the ventilation opening is located on the end surface of the positioning piece.

[0011] In one embodiment, the positioning member includes a first cylindrical cylinder and a second cylinder with a diameter larger than the first cylinder, and the second cylinder is arranged on the first cylinder; a positioning hole connected to the positive pressure air source is arranged on the end face of the positioning seat, one end of the first cylinder is inserted into the positioning hole, and the second cylinder is pressed onto the positioning seat, and an inner chamfer is arranged on the side of the positioning member away from the positioning seat.

[0012] In one embodiment, based on the top surface of the rotating body, the positioning member is higher than the first fixed fitting seat.

[0013] In one embodiment, two positioning matching parts are provided and are arranged opposite to each other on the top surface of the rotating body.

[0014] In one embodiment, a second air channel and a third air channel for connecting to an external air source are provided in the rotating body, one end of the second air channel is connected to the first air channel, and the other end of the second air channel is connected to the third air channel.

[0015] In one embodiment, a central hole is provided on the rotating body, a distribution shaft is inserted into the central hole, and the third air channel is provided on the distribution shaft.

[0016] In another aspect of the utility model, a turntable assembly is provided, including a worktable and a turntable device as described above, wherein a positioning sleeve corresponding to the positioning matching portion is arranged on one end surface of the worktable, and the positioning matching portion is inserted into the positioning sleeve.

[0017] In one embodiment, the first fixed matching seat is a conical structure, and a second fixed matching seat corresponding to and positioned with a plurality of first fixed matching seats is provided on one end surface of the workbench, and a conical groove matching with the conical structure is provided on the second fixed matching seat; and / or,

[0018] An outer chamfer is arranged on one side of the top surface of the positioning sleeve away from the rotating body.

[0019] The utility model also provides a machining center, comprising: an air source and a turntable device as described in any one of the above items, wherein the air source provides a positive pressure airflow for a first air channel.

[0020] The beneficial effect of the utility model is that a positioning matching part for positioning and matching with a workbench is provided on the rotating body, and a first air channel with a ventilation opening is provided in the positioning matching part. In actual use, air is sent into the first air channel, and the airflow flows out from the opening of the ventilation hole, so that iron filings and other debris on the positioning matching part can be blown away by the airflow, and at the same time, it can prevent iron filings and other debris from falling on the positioning matching part. Through the effect of the first air channel, the influence of iron filings and other debris is reduced, so that the rotating body in the utility model can be well assembled with the workbench. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is an assembly schematic diagram of the turntable device of the utility model;

[0023] Figure 2 It is a structural schematic diagram of the turntable device of the utility model;

[0024] Figure 3 It is a cross-sectional view of the turntable device of the utility model;

[0025] Figure 4 It is another cross-sectional view of the turntable device of the utility model;

[0026] Figure 5 It is a partial enlarged view of the positioning member of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the central axis of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the turntable device of the utility model installed on a base.

[0029] The figures are marked as follows: 1-rotating body, 2-working table, 3-first fixed fitting seat, 301-first cylinder, 302-second cylinder, 303-conical structure, 4-second fixed fitting seat, 5-conical seat, 6-positioning piece, 601-inner chamfer, 602-first cylinder, 603-second cylinder, 7-positioning sleeve, 701-outer chamfer, 8-positioning seat, 9-first air duct, 10-second air duct, 11-distribution shaft, 12-third air duct, 13-base, 14-recessed rail. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0031] In order to facilitate the assembly between the workbench and the rotary body, a positioning pin for positioning the workbench is provided on the rotary body. However, when the workbench is replaced on the rotary body, some iron filings or other debris may fall onto the positioning pin, so that when the rotary body and the workbench are assembled, the debris on the positioning pin will hit the workbench, thereby affecting the assembly accuracy between the rotary body and the positioning pin.

[0032] Based on the above problems, refer to Figure 1 , Figure 2 and Figure 4 The embodiment of the utility model provides a turntable device, including a rotating body 1, and a positioning matching part for positioning and matching with a workbench 2 is arranged on the top surface of the rotating body 1. When the rotating body 1 and the workbench 2 are assembled, the positioning matching part plays a role of positioning and guiding the workbench, so that the workbench 2 can be installed on the rotating body 1 more quickly and accurately. In addition, in order to prevent iron filings and other debris from falling on the positioning matching part, a first airway for connecting to a positive pressure air source is arranged in the positioning matching part, and the first airway includes a ventilation opening for spraying airflow outward, and the ventilation opening is located on the end face of the positioning matching part. When the workbench 2 is replaced, air is sent into the first airway, so that the airflow flows out from the end face of the positioning matching part, and the outflowing airflow can blow away the debris on the positioning matching part. At the same time, during the ventilation process of the first airway, it can play a role in preventing debris from falling on the end face of the positioning matching part. Through the setting of the first airway, the utility model reduces the influence of iron filings and other debris during the assembly of the rotating body 1 and the workbench 2, so as to ensure that the rotating body 1 can be well assembled with the workbench 2.

[0033] In one embodiment, reference Figure 2 and Figure 4 The positioning matching part includes a positioning member 6 and a positioning seat 8 for providing positioning for the positioning member 6. The positioning seat 8 is arranged on the top surface of the rotating body 1, and the positioning member 6 is inserted in the positioning seat 8. The positioning seat 8 is connected to the positive pressure air source, and the ventilation opening is located on the end surface of the positioning member 6. The positioning seat 8 plays a role in positioning and installing the positioning member 6. After the positioning member 6 is used for a long time, the positioning member 6 may be worn. Therefore, the positioning member 6 can be replaced according to the use of the positioning member 6, and a new positioning member 6 can be inserted in the positioning seat 8 for reuse.

[0034] Furthermore, the positioning seat 8 is a cylinder arranged on the rotating body 1, and a positioning hole connected to the positive gas source is arranged on the end face of the cylinder, and the positioning member 6 is detachably inserted into the positioning hole. The positioning member 6 includes a cylindrical first cylinder 602 and a second cylinder 603 having a diameter larger than the first cylinder 602. The second cylinder 603 is arranged on the first cylinder 602. When in use, one end of the first cylinder 602 is inserted into the positioning hole arranged on the end face of the positioning seat 8, and the other end of the first cylinder 602 is used for positioning and assembling with the workbench 2. For example, a positioning sleeve 7 is arranged on one end face of the workbench 2, and when the workbench 2 is assembled with the rotating body 1, the positioning member 6 is inserted into the positioning sleeve 7. The second cylinder 603 is pressed on the end face of the positioning seat 8, and the positioning seat 8 plays a role in positioning and supporting the positioning member 6 through the second cylinder 603.

[0035] Further, refer to Figure 2 , Figure 4 and Figure 5 , the positioning member 6 can be set as a positioning pin, and the positioning seat 8 can be set as a pin seat. Specifically, a positioning sleeve 7 is set on the workbench 2 assembled with the rotating body 1, and the positioning cooperation of the positioning pin and the positioning sleeve plays a positioning role in the installation of the workbench 2. An inner chamfer 601 is set on the side of the top surface of the positioning pin away from the rotating body 1, so that the end of the positioning pin is in an inward state, and an outer chamfer 701 is set on the side of the positioning sleeve 7 away from the end surface of the workbench 2, so that the end of the positioning sleeve 7 is in an outward expansion state. When the workbench 2 falls to the rotating body 1, the cooperation of the inner chamfer 601 and the outer chamfer 701 makes it easier for the inward-retracted positioning pin to be inserted into the positioning sleeve 7.

[0036] In one embodiment, reference Figures 2 to 4 The top surface of the rotating body 1 is provided with an annular first mounting surface, on which a plurality of first fixing seats 3 arranged in an annular shape are provided, and the plurality of first fixing seats 3 are used for positioning and assembling with the workbench 2. Based on the top surface of the rotating body 1, the positioning member 6 is higher than the first fixing seats 3.

[0037] Specifically, a second fixed fitting seat 4 is provided on the workbench 2 used for assembly with the rotating body 1 of the utility model, the first fixed fitting seat 3 is a conical structure, and the second fixed fitting seat 4 is provided with a conical groove that matches the conical structure. When the workbench 2 is installed on the rotating body 1, there may be a deviation between the first fixed fitting seat 3 and the second fixed fitting seat 4. Due to the conical structural characteristics of the first fixed fitting seat 3 and the second fixed fitting seat 4, when the workbench 2 falls to the first fixed fitting seat 3 and the second fixed fitting seat 4, the first fixed fitting seat 3 is inserted into the second fixed fitting seat 4 with a deviation, and the two will be corrected by friction until the workbench 2 is installed in place, that is, the second fixed fitting seat 4 will slide along the side wall of the first fixed fitting seat 3 until the first fixed fitting seat 3 and the second fixed fitting seat 4 are installed in place. Correcting the workbench 2 by friction for many times or for a long time will cause wear to the first fixed fitting seat 3 and the second fixed fitting seat 4, affecting the accuracy of both.

[0038] In this embodiment, with the top surface of the rotating body 1 as a reference, the height of the positioning member 6 is higher than the height of the first fixed matching seat 3 on the rotating body 1. When the workbench 2 is installed on the rotating body 1, the positioning sleeve 7 and the positioning member 6 are first contacted for assembly. The assembly of the positioning sleeve 7 and the positioning member 6 plays a positioning role in the installation of the workbench 2 on the rotating body 1. At this time, the second fixed matching seat 4 is aligned with the first fixed matching seat 3, avoiding the mutual friction between the second fixed matching seat 4 and the first fixed matching seat 3 during assembly due to deviation. The workbench 2 can be directly dropped and installed on the rotating body 1. The positioning assembly between the positioning sleeve 7 and the positioning member 6 avoids the need to assemble and correct the second fixed matching seat 4 and the first fixed matching seat 3 through friction between them, which is conducive to avoiding wear between the two due to friction.

[0039] Furthermore, the height difference between the positioning member 6 and the first fixed matching seat 3 is more than 2 mm, but it should not be too long. An overly long positioning member 6 increases the cost of the parts and makes it more abrupt on the first mounting surface, which may interfere with the installation of the workbench 2. If it is too short, it may not play a positioning and guiding role. Preferably, the positioning member 6 is 3 mm higher than the first fixed matching seat. In actual assembly, the positioning member 6 can satisfy the positioning function of the positioning sleeve 7, and it will not make the assembly of the workbench 2 and the rotating body 1 inconvenient because of being too high.

[0040] In one embodiment, reference Figure 2 and Figure 3The first fixed matching seat 3 is a cone seat, and the second fixed matching seat 4 is a cone sleeve. A plurality of cylindrical cone seats 5 are arranged on the first mounting surface. A cone seat hole is opened in the middle of the cone seat 5. The cone seat is detachably inserted into the cone seat hole. The cone seat 5 supports the cone seat. In this embodiment, four cone seats 5 are arranged, and each cone seat 5 is provided with a cone seat. The number of cone sleeves is matched with the cone seat arrangement. The structure of the cone seat includes a first cylinder 301, a second cylinder 302 and a cone structure 303 in sequence; wherein the diameter of the second cylinder 302 is larger than the diameter of the first cylinder 301, so that a step structure is formed between the two. When the first cylinder 301 is inserted into the cone seat hole, the second cylinder 302 abuts against the cone seat 5, and the cone structure 303 of the cone seat 3 is inserted into the cone sleeve.

[0041] In one embodiment, reference Figures 2 to 4 The positioning matching parts include two or more, and all are located between the first fixed matching seats 3 and are alternately arranged with the first fixed matching seats 3.

[0042] Preferably, two positioning matching parts 6 are provided, and the two positioning matching parts are arranged opposite to each other. To match the positioning matching parts, two positioning sleeves 7 are correspondingly arranged on the workbench 2. The two positioning members 6 are arranged opposite to each other on both sides of the top surface of the rotating body 1. When the positioning sleeves 7 and the positioning members 6 are assembled, the positioning of the two positioning members 6 forms a rotation restriction on the workbench 2 in the circumferential direction, so that the workbench 2 can only move in the up and down directions of the rotating body 1, further ensuring the installation accuracy of the first fixed matching seat 3 and the second fixed matching seat 4.

[0043] The so-called alternating arrangement of the positioning fitting parts and the first fixed fitting seats 3 specifically means that there is only one positioning fitting part between two adjacent first fixed fitting seats 3, that is, a structural arrangement of first fixed fitting seat 3-positioning fitting part-first fixed fitting seat 3 is formed.

[0044] In one embodiment, reference Figure 4 and Figure 5 An air path structure is arranged in the rotating body 1, and the air path structure includes a first air channel 9 and a second air channel 10 and a third air channel 12 arranged in the rotating body 1. One end of the second air channel 10 is connected to the first air channel 9, and the other end of the second air channel 10 is connected to the third air channel 12. The third air channel 12 is connected to an external air source, and the external air source supplies air to the third air channel 12. The air flow passes through the second air channel 10 and the first air channel 9 in sequence, and then flows out from the ventilation opening of the first air channel 9.

[0045] Specifically, the length direction inside the positioning member 6 is set to a through structure, and the through structure is a first air duct 9 included in the air path structure. The first air duct 9 can be connected to an external air source. In actual work, when the workbench 2 is replaced, the workbench 2 is removed from the rotating body 1, and the air source supplies air to the first air duct 9 to prevent debris from falling onto the positioning member 6 during the process of replacing the workbench 2, thereby preventing debris (such as iron filings after processing) from interfering with the assembly accuracy of the positioning member 6 and the positioning sleeve 7.

[0046] In one embodiment, reference Figure 4 and Figure 6 The rotary body 1 is provided with a central hole, a distribution shaft 11 is inserted into the central hole, and a third air channel 12 is provided on the distribution shaft 11. The third air channel 12 is provided on the distribution shaft 11, and when the distribution shaft 11 is inserted into the central hole, the third air channel 12 is connected to an end of the second air channel 10 away from the first air channel 9, and the third air channel 12 is connected to an external air source.

[0047] Further, refer to Figure 4 and Figure 7 The turntable device is also provided with a base 13 connected to the distribution shaft 11, and a joint for connecting to an external gas source is provided in the base 13, and the joint is connected to the third gas channel 12. A space for arranging a gas pipeline is provided in the base 13, one end of the gas pipeline is connected to the third gas channel 12, and the other end is provided with a joint, which is connected to an external gas source through the joint. When ventilation is required, the gas source supplies gas to the gas pipeline, thereby realizing ventilation of the gas path structure.

[0048] In another aspect of the present invention, reference Figures 1 to 4 , provides a turntable assembly, including a workbench 2 and any of the above turntable devices, one end surface of the workbench 2 is provided with a positioning sleeve 7 which corresponds to the positioning matching part one by one, and the positioning matching part is inserted in the positioning sleeve 7.

[0049] The assembly between the workbench 2 and the rotating body 1 is positioned by the positioning matching portion and the positioning sleeve 7, which has been described in detail in the above embodiment. Please refer to the above embodiment for details and will not be repeated here.

[0050] In one embodiment, reference Figures 2 to 4 A plurality of first fixed matching seats 3 arranged in a ring shape and used for cooperating with the workbench 2 are provided on the top surface of the rotating body 1. The first fixed matching seats 3 are of a conical structure. A second fixed matching seat 4 corresponding to and cooperating with the plurality of first fixed matching seats 3 is provided on one end surface of the workbench 2. A conical groove cooperating with the conical structure is provided on the second fixed matching seat 4.

[0051] The top surface of the rotating body 1 is provided with a first mounting surface in an annular shape, and a plurality of first fixed matching seats 3 arranged in an annular shape are provided on the first mounting surface. At least one positioning member 6 is also provided on the first mounting surface, and the height of the positioning member 6 is higher than the first fixed matching seat 3, taking the first mounting surface as a reference. When the workbench 2 is installed on the rotating body 1, the positioning sleeve 7 and the positioning member 6 are first contacted for assembly, and the assembly of the positioning sleeve 7 and the positioning member 6 plays a positioning role in the installation of the workbench 2 on the rotating body 1. At this time, the second fixed matching seat 4 is aligned with the first fixed matching seat 3, avoiding the mutual friction between the second fixed matching seat 4 and the first fixed matching seat 3 during assembly due to deviation, and the workbench 2 can be directly dropped and installed on the rotating body 1. The positioning assembly between the positioning sleeve 7 and the positioning member 6 avoids the need for friction between the second fixed matching seat 4 and the first fixed matching seat 3, which is conducive to avoiding wear caused by friction between the two.

[0052] A second mounting surface corresponding to the first mounting surface is provided on one end surface of the workbench 2, and a plurality of second fixed matching seats 4 are provided on the second mounting surface, and the plurality of second fixed matching seats 4 are sleeved on the first fixed matching seat 3 in a one-to-one correspondence. For example, the first fixed matching seat 3 is a cone seat, and the second fixed matching seat 4 is a cone sleeve, and the plurality of second fixed matching seats 4 are sleeved on the cone structure of the first fixed matching seat 3 in a one-to-one correspondence through their cone-shaped grooves. The positioning matching portion and the first fixed matching seat 3 are both provided on the first mounting surface, and the first mounting surface guides the setting of the positioning matching portion and the first fixed matching seat 3. The positioning sleeve 7 and the second fixed matching seat 4 are both provided on the second mounting surface, and the second mounting surface guides the setting of the positioning sleeve 7 and the second fixed matching seat 4.

[0053] Further, refer to Figure 2 , based on the second mounting surface, if the height of the positioning sleeve 7 is not less than the second fixed matching seat 4, it is possible that the second fixed matching seat 4 and the first fixed matching seat 3 are in contact first, and at this time, the positioning member 6 and the positioning sleeve 7 do not play a role. Therefore, based on the second mounting surface, the height of the positioning sleeve 7 is preferably not less than the second fixed matching seat 4. That is, the height of the positioning sleeve 7 must be greater than or equal to the second fixed matching seat 4, so that it can be ensured that when the workbench 2 and the rotating body 1 are assembled, the positioning member 6 and the positioning sleeve 7 are in contact first for assembly, thereby playing a positioning role.

[0054] Further, refer to Figure 4 and Figure 5 The side of the positioning sleeve 7 away from the top surface of the rotating body 1 is provided with an outer chamfer, and the side of the positioning member 6 away from the first mounting surface is provided with an inner chamfer 601. When the workbench 2 falls to the rotating body 1, the cooperation between the inner chamfer 601 and the outer chamfer 701 makes it easier for the retracted positioning member 6 to be inserted into the positioning sleeve 7.

[0055] The embodiment of the utility model further provides a machining center, characterized in that it comprises: an air source and any one of the above-mentioned turntable devices, wherein the air source provides a positive pressure airflow for the first air channel 9 .

[0056] When the workbench 2 is replaced in the machining center, the air flow input into the turntable assembly through the air source flows out from the end face of the positioning member 6. The air flow can blow away debris such as iron filings on the positioning member 6, and before the new workbench 2 is assembled on the rotating body 1, it can prevent debris from falling onto the end face of the positioning member 6, so as to avoid the assembly effect being affected by debris on the positioning member between the workbench 2 and the rotating body 1.

[0057] Further, the machining center includes a machine tool body, a guide rail is arranged on the machine tool body, a workbench 2 exchange position is arranged at one end of the guide rail, and a turntable device is movably arranged on the guide rail. Figure 7 The turntable device is installed on the base 13, and the base 13 is installed on the machine tool body and connected to the machine tool body through the recessed rail 14 and the guide rail on the machine tool body. When the workbench 2 needs to be exchanged, the turntable device moves along the guide rail to the exchange position of the workbench 2 to exchange the workbench 2. The positioning piece 6 and the positioning sleeve 7 play a positioning role in the exchange of the workbench 2.

[0058] It should be noted that the exchange process and related structures of the workbench 2 use the existing technical solution interface, and the specific exchange process and exchange principle of the workbench 2 will not be described in detail here.

[0059] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A turntable device, characterized in that: include: A rotating body (1), wherein the top surface of the rotating body (1) is provided with a positioning matching portion for positioning with a workbench (2), wherein the positioning matching portion is provided with a first air channel (9) for connecting to a positive pressure air source, wherein the first air channel (9) includes a ventilation opening for ejecting air flow outward, and wherein the ventilation opening is located on an end surface of the positioning matching portion; A plurality of first fixed matching seats (3) arranged in an annular shape and used for matching and positioning with the workbench (2) are provided on the top surface of the rotating body (1).

2. The turntable device according to claim 1, characterized in that: The positioning matching part comprises a positioning member (6) and a positioning seat (8) providing a positioning function for the positioning member (6); the positioning seat (8) is arranged on the top surface of the rotating body (1); the positioning member (6) is inserted into the positioning seat (8); the positioning seat (8) is connected to a positive pressure air source; and the ventilation opening is located on the end surface of the positioning member (6).

3. The turntable device according to claim 2, characterized in that: The positioning member (6) comprises a first cylindrical body (602) and a second body (603) having a diameter greater than that of the first body (602), wherein the second body (603) is arranged on the first body (602); a positioning hole connected to a positive pressure gas source is arranged on the end surface of the positioning seat (8), one end of the first body (602) is inserted into the positioning hole, and the second body (603) is pressed onto the positioning seat (8); and an inner chamfer is arranged on a side of the positioning member (6) away from the positioning seat (8).

4. The turntable device according to claim 3, characterized in that: Based on the top surface of the rotating body, the positioning member (6) is higher than the first fixed fitting seat (3).

5. The turntable device according to claim 4, characterized in that: The number of the positioning matching parts is two and they are arranged opposite to each other on the top surface of the rotating body (1).

6. The turntable device according to any one of claims 1 to 5, characterized in that: The rotating body (1) is provided with a second air channel (10) and a third air channel (12) for connecting to an external air source, one end of the second air channel is connected to the first air channel (9), and the other end of the second air channel (10) is connected to the third air channel (12).

7. The turntable device according to claim 6, characterized in that: The rotating body (1) is provided with a central hole, a distribution shaft (11) is inserted into the central hole, and the third air channel (12) is arranged on the distribution shaft (11).

8. A turntable assembly, characterized in that: It comprises a workbench (2) and a turntable device as claimed in any one of claims 1 to 7, wherein a positioning sleeve (7) corresponding to the positioning matching part is arranged on one end surface of the workbench (2), and the positioning matching part is inserted into the positioning sleeve (7).

9. The turntable assembly according to claim 8, characterized in that: The first fixed matching seat (3) is a conical structure, and one end surface of the workbench (2) is provided with a second fixed matching seat (4) which is matched and positioned with a plurality of the first fixed matching seats (3) in a one-to-one correspondence, and the second fixed matching seat (4) is provided with a conical groove which matches the conical structure; and / or, An outer chamfer is provided on one side of the top surface of the positioning sleeve (7) away from the rotating body (1).

10. A machining center, characterized in that: include: An air source and a turntable device as described in any one of claims 1 to 7, wherein the air source provides a positive pressure airflow for the first air channel (9).

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