Rotation support device

Abstract

To provide a highly reliable rotation supporting device.SOLUTION: In a rotation support device for rotatably supporting a table having a workpiece fixing part around a first axis, a body part includes a first part having a first space for storing at least a part of a rotary joint, and a second part detachably fixed to the first part. The first flow passage through which the first fluid flows is formed in the shaft portion of the rotary joint, and the second flow passage communicating with the first flow passage is formed in the second portion of the main body. A first seal member is provided on the first portion of the body and a second seal member is provided on the second portion of the body. A second space communicating with the outside of the main body is formed between the first seal member and the second seal member. The first seal member seals between the first space and the second space. The second seal member seals between the first flow path and the second flow path and the second space.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present technology relates to a rotary support device. [Background technology]

[0002] Rotary support devices that rotatably support a table to which a workpiece is fixed have been known for some time. Examples of such rotary support devices include those described in Japanese Patent Laid-Open No. 2002-103181 (Patent Document 1) and Japanese Patent Laid-Open No. 2013-43270 (Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-103181 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-43270 Summary of the Invention [Problem to be solved by the invention]

[0004] A rotary joint is provided inside the rotary support device to supply the necessary fluid to the workpiece processing section. From the viewpoint of improving the durability and reliability of the rotary support device, it is necessary to protect the rotary joint.

[0005] An object of the present technology is to provide a rotary support device that is durable and highly reliable. [Means for solving the problem]

[0006] The present technology provides the following rotational support device.

[0007] [1] A rotary support device that rotatably supports a table having a workpiece fixing portion around a first axis, the rotary support device comprising: a main body; and a rotary joint provided on the main body and including an axial portion that is rotatable around the first axis relative to the main body; the main body includes a first portion having a first space that accommodates at least a portion of the rotary joint, and a second portion detachably fixed to the first portion; a first flow path through which a first fluid flows is formed in the axial portion of the rotary joint; a second flow path that communicates with the first flow path is formed in the second portion of the main body; a first seal member is provided on the first portion of the main body; and a second seal member is provided on the second portion of the main body; a second space that communicates with the outside of the main body is formed between the first seal member and the second seal member; the first seal member seals between the first space and the second space; and the second seal member seals between the first flow path and the second space and the second flow path.

[0008] According to the above aspect [1], the first space housing at least a portion of the rotary joint and the second space communicating with the outside of the main body are sealed by the first seal member, and the first and second flow paths through which the first fluid flows are sealed by the second seal member, and the first space housing at least a portion of the rotary joint is sealed by the first seal member. Since the second space communicating with the outside is formed between the first and second seal members, even if the second seal member does not adequately seal the first and second flow paths, the first fluid is discharged from the second space to the outside, and the rotary joint components housed in the first space (such as bearings and seals) are protected by the first seal member. This improves the durability and reliability of the rotary support device.

[0009] [2] The rotation support device according to [1], wherein the first fluid is a coolant that is ejected toward the workpiece fixing portion or a workpiece fixed to the workpiece fixing portion.

[0010] According to the above aspect [2], it is possible to prevent coolant from entering the first space that houses at least a part of the rotary joint, and it is also possible to improve the efficiency of cutting a workpiece placed on the workpiece fixing part using high-pressure coolant.

[0011] [3] A rotary support device as described in [1] or [2], further comprising a connection block formed of a separate member from the main body portion and having a first connection port communicating with the first flow path and the second flow path, wherein a first external pipe supplying the first fluid is connected to the first connection port from a direction intersecting the first axis.

[0012] According to the above aspect [3], since the first external piping is connected from a direction intersecting the first axis, space can be saved in the direction of the first axis, and as a result, the area of ​​the work fixing part can be enlarged in the direction of the first axis.

[0013] [4] The connection block further has a second connection port communicating with the rotary joint, and a second external pipe supplying a second fluid to the rotary joint is connected to the second connection port from a direction intersecting the first axis. [3] A rotary support device as described in [3].

[0014] According to the above aspect [4], since the second external pipe is connected from a direction intersecting the first axis, space can be saved in the direction of the first axis, and as a result, the area of ​​the work fixing part can be enlarged in the direction of the first axis.

[0015] [5] A rotary support device as described in [3] or [4], wherein the connection block is arranged so as to protrude from the main body portion toward the outer periphery of the first shaft.

[0016] According to the above aspect [5], by providing the connection block so that it protrudes from the main body toward the outer periphery of the first axis, it is possible to save space in the direction of the first axis, and as a result, it is possible to increase the area of ​​the work fastening part in the direction of the first axis.

[0017] [6] A rotary support device according to any one of [3] to [5], wherein the connection block is provided at a distance from the second portion of the main body.

[0018] According to the above aspect [6], the connection block to which the first external pipe or the second external pipe is connected is provided at a distance from the second part of the main body, so that when detaching the second part to replace the second sealing member, there is no need to remove the first external pipe and the second external pipe, and the second sealing member can be easily replaced.

[0019] [7] A rotary support device according to any one of [1] to [6], wherein the first flow path extends parallel to the first axis.

[0020] According to the above aspect [7], the fluid can be efficiently supplied to the workpiece machining portion through the first flow path extending in the direction of the first axis. [Effects of the Invention]

[0021] In this way, according to the present technology, it is possible to improve the durability and reliability of the rotation support device. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a diagram showing a machine tool including a rotary support device according to one embodiment of the present technology. [Figure 2] 1A and 1B are diagrams illustrating a configuration of a rotation support device according to one embodiment of the present technology. [Figure 3] FIG. 3 is a partially enlarged view of the rotation support device shown in FIG. 2. [Figure 4] FIG. 10 is a partially enlarged view of a rotation support device according to a comparative example. [Figure 5] 1 is a diagram showing a state in which external piping is connected to a rotation support device according to one embodiment of the present technology; [Figure 6] FIG. 10 is a diagram showing a state in which an external pipe is connected to a rotation support device according to a comparative example. [Figure 7] 1 is a diagram showing a state in which a cap member is removed from a rotation support device in accordance with one embodiment of the present technology. FIG. [Figure 8] 1 is a diagram showing a state in which a rotary joint in a rotation support device according to an embodiment of the present technology is disassembled; [Figure 9] FIG. 10 is a diagram showing an exploded state of a rotary joint in a rotation support device according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present technology will be described. Note that the same or corresponding parts are denoted by the same reference characters, and description thereof may not be repeated.

[0024] In the embodiments described below, when numbers, amounts, etc. are mentioned, the scope of the present technology is not necessarily limited to those numbers, amounts, etc., unless otherwise specified. Furthermore, in the following embodiments, each component is not necessarily essential to the present technology, unless otherwise specified. Furthermore, the present technology is not necessarily limited to those that achieve all of the effects and advantages mentioned in the present embodiments.

[0025] In this specification, the terms "comprise," "include," and "have" are open-ended. That is, when a certain feature is included, other features may or may not be included.

[0026] Furthermore, when geometric terms and terms expressing positional and directional relationships are used in this specification, such as "parallel," "orthogonal," "45° diagonal," "coaxial," and "along," these terms allow for manufacturing errors and slight variations. When terms expressing relative positional relationships, such as "upper side" and "lower side," are used in this specification, these terms are used to indicate relative positional relationships in a single state, and the relative positional relationships can be reversed or rotated to any angle depending on the installation direction of each mechanism (for example, by turning the entire mechanism upside down).

[0027] In this specification, each configuration may be assigned an ordinal number such as "first" or "second," but these ordinal numbers do not limit the priority, order, etc. unless explicitly specified.

[0028] Fig. 1 is a diagram showing a machine tool 1 (machining center) according to one embodiment, Fig. 2 is a diagram showing the configuration of a rotation support device 100.

[0029] As shown in Fig. 1, the machine tool 1 includes a spindle 2 and a cutting tool 3. The spindle 2 is capable of holding the cutting tool 3. The cutting tool 3 is a tool used to perform cutting on a workpiece W (a workpiece).

[0030] Machine tool 1 further includes a rotary support device 100 (index table), a rotary support device 200 (support table), a base 300, and a table 400 (cradle jig). Rotary support devices 100 and 200 are provided on base 300.

[0031] As shown in FIG. 2, the rotary support device 100 includes a main body 110 and a rotary joint 120. A flow path 130 is provided within the main body 110. The rotary support device 100 supports a table 400 via a roller bearing 150 so that the table 400 is rotatable about the A-axis (first axis) in the figure. The rotary support device 200 also supports the table 400 so that the table 400 is rotatable about the A-axis in the figure. Therefore, cutting can be performed on a workpiece W supported on the table 400 (workpiece fixing portion) from any angle using a cutting tool 3. The table 400 may also support the workpiece W so that the workpiece W is rotatable about the C-axis in the figure.

[0032] The power of a servo motor (not shown) provided inside the rotary support device 100 is transmitted to the table 400 via the roller gear cam 140, causing the table 400 to rotate around the A axis. By using the roller gear cam 140, torque can be transmitted by rolling contact, resulting in a highly durable rotary support device 100 that can operate stably with high precision.

[0033] An external pipe 500 is connected to the rotation support devices 100, 200. Fluids such as coolant and working fluid are supplied to the rotation support devices 100, 200 via the external pipe 500.

[0034] More specifically, external pipes 511 and 512 are connected to the rotation support device 100, and external pipes 521 and 522 are connected to the rotation support device 200. Although not shown in FIG. 1, three or more external pipes may be connected to the rotation support devices 100 and 200.

[0035] Coolant (first fluid) is supplied to the rotary support devices 100, 200 from external pipes 511, 521 (first external pipes). The coolant is discharged from a nozzle 600 toward the table 400 or the workpiece W. The coolant supplied to the rotary support device 100 reaches a nozzle 610 located above the table 400 via a flow path 130. Similarly, the coolant supplied to the rotary support device 200 reaches a nozzle 620 located above the table 400.

[0036] A working fluid (second fluid) is supplied to the rotary support devices 100, 200 from external piping 512, 522 (second external piping). The working fluid is supplied to a clamping device 700 that fixes the workpiece W, and operates the clamping device 700. The working fluid supplied to the rotary support device 100 is supplied to a clamping device 710 provided on the table 400 via a rotary joint 120 (a flow path 125 described below). Similarly, the working fluid supplied to the rotary support device 200 is supplied to a clamping device 720 provided on the table 400.

[0037] 1 shows two clamping devices 710, 720, but the number of clamping devices 700 is not limited to this. Furthermore, the mechanism for gripping and fixing the workpiece W is not limited to the form of the clamping device 700 exemplified in FIG.

[0038] Hydraulic oil may be used as the working fluid supplied to the clamp device 700. However, air may be used as the working fluid instead of hydraulic oil. By using hydraulic oil as the working fluid, a larger driving force can be obtained compared to when air is used, and therefore the gripping force of the clamp device 700 can be improved in a limited space.

[0039] 1, both ends of table 400 are rotatably supported by rotary support devices 100 and 200, but instead, rotary support device 200 may not be provided, and rotary support device 100 may support table 400 in a cantilevered manner. Furthermore, the structure described below that is applied to rotary support device 100 can also be applied to rotary support device 200.

[0040] Fig. 3 is a partially enlarged view of the rotary support device 100. As shown in Fig. 3, the main body 110 of the rotary support device 100 includes a first member 111 (main body barrel), a second member 112 (cap member), and a third member 113 (main body bottom). A piping block 800 (connection block) to which an external piping 500 is connected is provided on the outer periphery of the first member 111. The piping block 800 has a connection port 810 (first connection port) to which an external piping 511 is connected, and a connection port 820 (second connection port) to which an external piping 512 is connected.

[0041] Connection port 810 communicates with flow path 130 in main body 110. Rotary joint 120 is provided with bearing 124, a plurality of flow paths 125, and seals 126 that seal the plurality of flow paths 125. Connection port 820 communicates with one of flow paths 125 of rotary joint 120.

[0042] A space 910 (first space) that houses a part of the rotary joint 120 is formed inside the first member 111 and the third member 113. In the example of Fig. 3, at least the bearing 124 and the seal 126 are housed in the space 910. The second member 112 is attached to the third member 113.

[0043] The second member 112 is detachably fixed to the first member 111 and the third member 113 (first portion). A space 920 (second space) is formed between the second member 112 (second portion) and the third member 113. The space 920 communicates with the outside of the main body 110 via the drain port 114.

[0044] Rotary joint 120 includes housing 121 and shaft members 122 and 123. Housing 121 is fixed to first member 111 of main body 110. Shaft members 122 and 123 are provided rotatably with respect to main body 110 and housing 121. Shaft member 123 is a separate member from shaft member 122. Shaft member 123 fits onto the tip of shaft member 122. Shaft members 122 and 123 (shaft portions) are supported by housing 121 via bearings 124 and rotate integrally therewith.

[0045] A flow path 131 (first flow path) is formed in the shaft members 122 and 123 of the rotary joint 120. In the present embodiment, the flow path 131 is illustrated as extending parallel to the extension direction of the shaft members 122 and 123 at the center of the shaft member 122, but the flow path 131 may be formed at a position away from the center of the shaft member 122, or may extend in a direction intersecting the extension direction of the shaft members 122 and 123.

[0046] A flow path 132 (second flow path) is formed in the second member 112 of the main body 110. The flow path 132 communicates with the external pipe 511 via the connection port 810, and also communicates with the flow path 131 provided in the shaft member 122 of the rotary joint 120. The coolant supplied from the external pipe 511 flows through the connection port 810, the flow path 132, and the flow path 131, and is then discharged from the nozzle 610 toward the table 400 or the workpiece W.

[0047] A seal member 1100 (first seal member) is provided between third member 113 of main body 110 and shaft member 122 of rotary joint 120. Seal member 1100 seals between space 910 and space 920.

[0048] A seal member 1200 (second seal member) is provided between second member 112 of main body 110 and shaft member 123 of rotary joint 120. Seal member 1200 seals between flow paths 131, 132 and space 920.

[0049] Fig. 4 is a partially enlarged view of a rotary support device 100A according to a comparative example. In the rotary support device 100A shown in Fig. 4, a main body 110A includes a first member 111A (main body trunk), a second member 112A (cap member), and a third member 113A (main body bottom). A rotary joint 120A is provided with a bearing 124A, a plurality of flow paths 125A, and a seal 126A that seals the plurality of flow paths 125A.

[0050] A space 900A that houses a portion of rotary joint 120A is formed inside first member 111A and third member 113A. In the example of Fig. 4, at least bearing 124A and seal 126A are housed in space 900A. Second member 112A is attached to third member 113A.

[0051] Rotary joint 120A includes housing 121A and a shaft member 122A. Housing 121A is fixed to first member 111A of main body 110A. Shaft member 122A is rotatably supported by bearing 124A with respect to main body 110A and housing 121A.

[0052] A flow path 131A is formed in shaft member 122A of rotary joint 120A. A flow path 132A is formed between second member 112A and third member 113A of main body 110A. Flow path 132A communicates with external piping 511A and also communicates with flow path 131A provided in shaft member 122A of rotary joint 120A.

[0053] A seal member 1100A is provided between shaft member 122A of rotary joint 120A and third member 113A of main body portion 110A. Seal member 1100A seals between space 900A and flow path 132A.

[0054] An external pipe 500A is connected to the main body 110A. The external pipe 511A is connected to the second member 112A. A coolant is supplied from the external pipe 511A. The coolant that flows into the flow path 132A reaches the table 400 side via the flow path 131A. The external pipes 512A and 513A are connected to the third member 113A. The fluid supplied from the external pipes 512A and 513A reaches the table 400 side via the rotary joint 120A.

[0055] The coolant is used to improve the efficiency of cutting the workpiece W. To further improve the efficiency of cutting, a high-pressure coolant (for example, a discharge pressure of about 1.5 MPa or more, about 20 MPa or less, or about 7 MPa or less) may be used. For this reason, it is preferable to use a seal member 1100A that can withstand high pressures to seal the flow path 132A through which the coolant flows.

[0056] On the other hand, if coolant seeps into space 900A, where the coolant may contain fine chips, the coolant will reach bearing 124A and seal 126A of rotary joint 120A. To prevent this, seal member 1100A is also required to be highly durable.

[0057] From the viewpoint of maintaining high durability while being compatible with high-pressure coolant, there is room for improvement in the rotation support device 100A according to the comparative example.

[0058] In contrast, in the rotary support device 100 of this embodiment, two seal members 1100, 1200 are provided between the shaft members 122, 123 (rotating parts) of the rotary joint 120 and the main body 110 (fixed part) at the end away from the table 400, and a space 920 is formed between the two seal members 1100, 1200.

[0059] According to this aspect, space 910, which houses bearing 124 and seal 126 of rotary joint 120, and space 920, which communicates with the outside of main body 110, are sealed by seal member 1100, and flow paths 131 and 132, through which high-pressure coolant flows, are sealed by seal member 1200. In other words, flow paths 131 and 132 are sealed by seal member 1200, and space 910, which houses bearing 124 and seal 126, is sealed by seal member 1100.

[0060] Furthermore, since space 920 communicating with the outside is formed between seal member 1100 and seal member 1200, even if seal member 1200 (primary seal) does not sufficiently seal flow paths 131, 132, coolant leaking from seal member 1200 is discharged from space 920 to the outside via drain port 114. The components of rotary joint 120 housed in space 910 (bearing 124, seal 126, etc.) are protected by seal member 1100 (secondary seal). The coolant discharged from drain port 114 can be collected together with the coolant discharged from nozzle 600.

[0061] The rotary support device 100 according to this embodiment can improve the durability and reliability of the device compared to the rotary support device 100A according to the comparative example, and can improve the efficiency of cutting the workpiece W placed on the table 400 using high-pressure coolant.

[0062] It is preferable to use an oil seal with excellent durability as the sealing member 1100. It is preferable to use an O-ring, rotary seal, or the like, which are small and can easily withstand high pressure, as the sealing member 1200. Note that a drain port 114 is provided between the sealing member 1100 and the sealing member 1200, which prevents the sealing member 1100 side from becoming high pressure.

[0063] 5 and 6 show the state in which external pipes 500 and 500A are connected to the rotary support devices 100 and 100A, respectively, as viewed from the A-axis direction. In both Figures 5 and 6, a total of 13 external pipes 500 and 500A are connected (one pipe for coolant supplied to the flow paths 130 and 130A and 12 pipes for working fluid supplied to the flow paths 125 and 125A). Furthermore, when viewed from the A-axis direction, the rotary support devices 100 and 100A are roughly the same size.

[0064] 5, in the rotary support device 100 according to this embodiment, a piping block 800 formed as a separate member from the main body 110 is provided so as to protrude more radially outward than the main body 110. Therefore, all external pipes 500 can be connected to the side of the piping block 800 from a direction substantially perpendicular to the A-axis direction (or from a direction obliquely intersecting the A-axis direction). The size of the piping block 800 can be changed as appropriate.

[0065] As shown in Figure 6, in the rotation support device 100A of the comparative example, the circumferential length of the third member 113A of the main body portion 110A is shorter than that of the piping block 800 shown in Figure 5, so that some of the external piping 500A (external piping 511A, 513A, etc. in Figure 4) are connected to the main body portion 110A from the A-axis direction.

[0066] 5 and 6, in the rotary support device 100 (FIG. 5) according to this embodiment, the external piping 500 is connected to the side of the piping block 800 protruding from the outer periphery of the main body 110 in a direction substantially perpendicular to the A-axis (first axis), thereby saving space in the A-axis direction. As a result, the area of ​​the table 400 can be expanded in the A-axis direction, making it possible to machine larger workpieces W.

[0067] Next, replacement of parts in the rotation support devices 100, 100A will be described with reference to FIGS.

[0068] 7 is a diagram showing a state in which the second member 112 (cap member) has been removed from the rotation support device 100. As shown in Fig. 7, in the rotation support device 100, it is possible to replace the seal member 1200 (primary seal) by removing only the second member 112. It is also possible to replace the shaft member 123 of the rotary joint 120 at the same time.

[0069] Furthermore, since the piping block 800 is provided at a distance from the second member 112 of the main body 110, there is no need to remove the external piping 500 when removing and attaching the second member 112 to replace the seal member 1200. Therefore, the seal member 1100 can be easily replaced.

[0070] Furthermore, in the rotary support device 100 according to this embodiment, the seal member 1100 can be replaced from the opposite side of the table 400. Therefore, there is no need to disassemble each component of the table 400 when replacing the seal member 1100, which makes replacement of the seal member 1100 more efficient.

[0071] Figure 8 is a diagram showing an exploded view of rotary joint 120 in rotation support device 100. As shown in Figure 8, by removing housing 121 of rotary joint 120, it is possible to replace parts of rotary joint 120 (bearing 124, seal 126, etc.).

[0072] In the state shown in Fig. 8, plug member 1300 is attached to prevent coolant from leaking from flow path 131. However, even in the state shown in Fig. 8, external piping 500 is connected to piping block 800. In this way, in rotation support device 100 according to this embodiment, it is possible to replace the seal of rotary joint 120 while external piping 500 remains connected.

[0073] 9 is a diagram showing an exploded view of rotary joint 120A in rotation support device 100A. In the comparative example shown in FIG. 9, external piping 500A is connected to second member 112A and third member 113A of main body 110A. Therefore, when replacing parts, it is necessary to remove external piping 500A in order to remove second member 112A and third member 113A.

[0074] In contrast to this, in the rotary support device 100 according to this embodiment, as shown in Figures 7 and 8, parts can be replaced while maintaining the connection of the external piping 500, which makes it possible to prevent coolant or chips from entering unintended locations during disassembly and maintenance.

[0075] (supplement) The dimensions of the components shown in the drawings in this embodiment, such as width, length, diameter, etc., are not limited to those shown in the drawings and can be changed as appropriate.

[0076] For example, by changing the combination of the number of circuits (number of flow paths 125) and the circuit diameter (diameter of the flow paths 125) of the rotary joint 120, it is possible to achieve a case where the circuit diameter (e.g., 3.5 mm) is relatively small but the number of circuits (e.g., 12 ports) is large (Option A), or a case where the number of circuits (e.g., 9 ports) is relatively small but the circuit diameter (e.g., 6.0 mm) is large (Option B).

[0077] Option A above is useful when a relatively large number of fluid circuits are required on table 400, for example, to add a sensor function for checking the position of clamp device 700. On the other hand, option B above is useful when, for example, it is desired to operate a relatively large clamp device 700 at high speed on table 400.

[0078] In the rotary support device 100 according to this embodiment, the external piping 500 is connected to the piping block 800, which is provided as a separate component from the main body 110. Therefore, by replacing the rotary joint 120 and the piping block 800, multiple circuit patterns including the above-mentioned option A and option B can be realized without changing the main body 110.

[0079] Although the embodiments of the present technology have been described above, the embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present technology is defined by the claims, and it is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0080] 1 machine tool, 2 spindle, 3 cutting tool, 100, 100A, 200 rotation support device, 110, 110A main body, 111, 111A first member, 112, 112A second member, 113, 113A third member, 114 drain port, 120, 120A rotary joint, 121, 121A housing, 122, 122A, 123 shaft member, 124, 124A bearing, 125, 125A flow path, 126, 126A seal, 130, 131, 131A, 132, 132A flow path, 140 roller gear cam, 150 roller bearing, 300 base, 400 Table, 500, 500A, 511, 511A, 512, 512A, 513A, 521, 522 External piping, 600, 610, 620 Nozzle, 700, 710, 720 Clamping device, 800 Piping block, 810, 820 Connection port, 900A, 910, 920 Space, 1100, 1100A, 1200 Sealing member, 1300 Plug member.

Claims

1. A rotary support device that supports a table having a workpiece fixing portion rotatably around a first axis, a main body; a rotary joint provided to the main body portion and including a shaft portion rotatable around the first axis relative to the main body portion, the main body includes a first portion having a first space that accommodates at least a portion of the rotary joint, and a second portion detachably fixed to the first portion, a first flow path through which a first fluid flows is formed in the shaft portion of the rotary joint; a second flow path communicating with the first flow path is formed in the second portion of the main body; a first seal member disposed on the first portion of the body; a second seal member disposed on the second portion of the body; a second space communicating with the outside of the main body portion is formed between the first seal member and the second seal member; the first seal member seals the first space and the second space; The second seal member seals the first and second flow paths and the second space.

2. The rotation support device according to claim 1 , wherein the first fluid is a coolant that is discharged toward the workpiece fastening portion or a workpiece fastened to the workpiece fastening portion.

3. a connection block formed as a separate member from the main body portion and having a first connection port communicating with the first flow path and the second flow path; 3. The rotation support device according to claim 1, wherein a first external pipe for supplying the first fluid is connected to the first connection port in a direction intersecting the first axis.

4. the connection block further includes a second connection port communicating with the rotary joint; 4. The rotary support device according to claim 3, wherein a second external pipe for supplying a second fluid to the rotary joint is connected to the second connection port in a direction intersecting the first axis.

5. The rotation support device according to claim 3 , wherein the connection block is provided so as to protrude from the main body portion toward an outer periphery of the first shaft.

6. The rotary support device according to claim 3 , wherein the connection block is provided spaced apart from the second portion of the main body.

7. The rotary support device according to claim 1 or 2, wherein the first flow path extends parallel to the first axis.

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