A turntable cooling structure

Abstract

A turntable cooling structure of the present invention comprises a turntable shell, an inner shaft, a rotating outer sleeve rotatably arranged on the outer periphery of the inner shaft, an adapter core shaft, a center shaft, a turntable bearing, and a working channel arranged between the inner shaft and the rotating outer sleeve. The cooling structure comprises a water inlet channel, a water outlet channel and a leakage channel. The water inlet channel and the water outlet channel penetrate and surround the inner shaft, the rotating outer sleeve, the adapter core shaft and the center shaft. A sealing structure is installed between the inner shaft and the rotating outer sleeve. The water inlet channel and the water outlet channel can surround and penetrate the turntable center structure to cool the inner shaft, the rotating outer sleeve, the adapter core shaft, the center shaft and the turntable bearing, and can effectively reduce the heat generation of the turntable rotary joint and improve the machining accuracy and precision. In addition, by setting the sealing structure, the working channel and the cooling channel are separated, thereby solving the problem of cavity crosstalk between the cooling medium used to cool the turntable and the working medium of the rotary joint.

Description

Technical Field

[0001] The invention relates to the field related to turntable cooling, and in particular to a turntable cooling structure. Background Art

[0002] At present, in order to meet the processing requirements of workpiece features, CNC turntables often increase their rotation speed. However, the increase in turntable speed will increase the temperature of the turntable center structure. The increase in temperature causes a large error in the matching accuracy of the inner shaft of the turntable center rotary joint, thereby affecting the processing accuracy and stability of the turntable.

[0003] The existing turntable has a gap seal between the inner shaft and the rotating outer sleeve through which the working medium circulates to solve the heating problem of the rotary joint. However, the gap seal will cause the working medium of the rotary joint and the cooling medium of the turntable to cross-connect, affecting the stable operation of the turntable. At the same time, it also means that the working medium of the rotary joint must be the same as the cooling medium, usually hydraulic oil. On the one hand, the cooling effect of hydraulic oil is not as good as cooling water. On the other hand, the rotary joint cannot pass other media except hydraulic oil, such as compressed air gas medium. The functional pipeline of the turntable is restricted by the working medium, which is inconvenient to use.

[0004] For example, Chinese patents with publication numbers CN117047554A and CN219005468U disclose a turntable mechanism, a machining center, and a turntable structure with shaft cooling. A cooling circuit is provided to cool the turntable base, turntable table surface, turntable bearings, and other structures, but there is no cooling structure design for the inner shaft of the rotary joint. Summary of the invention

[0005] The purpose of the present invention is to provide a turntable cooling structure, which can not only improve the cooling effect of the inner shaft of the turntable rotary joint, but also solve the problems of limited working medium and cooling medium cavity leakage caused by the inner shaft gap sealing of the rotary joint.

[0006] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a turntable cooling structure, which includes a turntable shell, an inner shaft fixed on the turntable shell, a rotating outer sleeve rotatably arranged on the outer periphery of the inner shaft, a transfer core shaft fixed to the rotating outer sleeve, a center shaft fixed to the transfer core shaft, a turntable bearing installed between the outer periphery of the center shaft and the inner wall of the turntable shell, and a working channel arranged between the inner shaft and the rotating outer sleeve, the cooling structure includes a water inlet channel, a water outlet channel and a leakage channel, the water inlet channel and the water outlet channel pass through and surround the inner shaft, the rotating outer sleeve, the transfer core shaft and the center shaft, wherein a sealing structure is installed between the inner shaft and the rotating outer sleeve, and an inner shaft cooling channel is opened in the inner shaft.

[0007] Beneficial effects: By surrounding and penetrating the inner shaft, the rotating outer sleeve, the adapter core shaft and the center shaft through the water inlet channel and the water outlet channel, the internal structure of the turntable can be cooled, the internal temperature of the turntable can be controlled, the stability of the turntable operation can be improved, and high-precision design requirements can be achieved. The leakage channel can cool the sealing structure between the inner shaft and the rotating outer sleeve to prevent the high-speed operation of the turntable from generating a large amount of heat that damages the sealing structure. Since there is a clearance fit between the inner shaft and the rotating joint, the sealing structure can separate the cooling channel from the working channel to prevent the medium in the working channel from communicating with the medium in the cooling channel. The rotating outer sleeve and the inner shaft are rotatably installed together, and the inner shaft generates more heat. By arranging an inner shaft cooling channel inside the inner shaft, the cooling of the inner shaft can be improved.

[0008] According to a further technical solution, the water inlet channel includes a water inlet cooling loop and a water inlet connecting passage, the water inlet cooling loop is connected to the water inlet connecting passage, and the water outlet channel includes a water outlet cooling loop and a water outlet connecting passage.

[0009] Beneficial effects: The water inlet channel and the water outlet channel are divided into a loop and a passage. The loop surrounds the internal rotating part structure of the turntable, and the passage runs through part of the internal structure of the shaft to achieve surface and internal cooling and improve the cooling effect.

[0010] A further technical solution is that the water inlet cooling ring includes a first water inlet cooling ring, a second water inlet cooling ring, a third water inlet cooling ring and a fourth water inlet cooling ring, the first water inlet cooling ring is opened on the circumference of the inner periphery of the rotating outer sleeve, the second water inlet cooling ring is opened on the circumference of the outer periphery of the rotating outer sleeve, the third water inlet cooling ring is opened on the circumference of the outer periphery of the transfer core shaft, and the fourth water inlet cooling ring is opened on the outer circumference of the center shaft.

[0011] Beneficial effects: Circumferential cooling channels are arranged on the surfaces of the inner shaft, the rotating outer sleeve, the transfer core shaft and the central shaft, so as to improve the cooling effect and accelerate the heat dissipation.

[0012] A further technical solution is that the water inlet connecting passage includes a first water inlet passage, a second water inlet passage, a third water inlet passage, and a fourth water inlet passage. The first water inlet passage is opened in the inner shaft, connecting the cooling water inlet channel and the first water inlet cooling loop. The cooling water inlet channel is fixed on the turntable shell. The second water inlet passage is opened in the rotating outer sleeve, connecting the first water inlet cooling loop and the second water inlet cooling loop. The third water inlet passage is opened in the transfer core shaft, connecting the second water inlet cooling loop and the third water inlet cooling loop. The fourth water inlet passage is opened in the central shaft, connecting the third water inlet cooling loop and the fourth water inlet cooling loop.

[0013] Beneficial effects: The inner shaft, the rotating outer sleeve, the adapter core shaft and the central shaft are all provided with water inlet passages for connecting the winding cooling loops, which can not only connect the first water inlet cooling loop, the second water inlet cooling loop, the third water inlet cooling loop and the fourth water inlet cooling loop, but also realize the cooling of the inside of the component and improve the cooling effect.

[0014] According to a further technical solution, at least two of the first water inlet passage, the second water inlet passage, the third water inlet passage and the fourth water inlet passage are provided, and are evenly arranged in a circle relative to the axis of the inner shaft.

[0015] Beneficial effect: There can be multiple water inlet passages, and the more the number, the better the heat dissipation effect.

[0016] According to a further technical solution, the water outlet cooling ring includes a first water outlet cooling ring, a second water outlet cooling ring, a third water outlet cooling ring and a fourth water outlet cooling ring, the first water outlet cooling ring is opened on the center axis, the second water outlet cooling ring is opened on the circumference of the transfer core shaft, the third water outlet cooling ring is opened on the circumference of the outer periphery of the rotating outer sleeve, and the fourth water outlet cooling ring is opened on the circumference of the inner periphery of the rotating outer sleeve.

[0017] A further technical solution is that the water outlet connecting passage includes a first water outlet passage, a second water outlet passage, a third water outlet passage and a fourth water outlet passage, the first water outlet passage is opened in the central shaft, connecting the fourth water inlet cooling loop and the first water outlet cooling loop, the second water outlet passage is opened in the central shaft, the second water outlet passage connects the first water outlet cooling loop and the second water outlet cooling loop, the third water outlet passage is opened in the transfer core shaft, connecting the second water outlet cooling loop and the third water outlet cooling loop, the fourth water outlet passage is opened in the rotating outer sleeve, connecting the third water outlet cooling loop and the fourth water outlet cooling loop, the first water outlet passage, the second water outlet passage, the third water outlet passage and the fourth water outlet cooling loop are each provided with at least two, and are all evenly arranged in a circular shape relative to the axis of the inner shaft.

[0018] Beneficial effect: A double channel is formed by arranging water inlet and outlet channels on the inner shaft, the rotating outer sleeve, the adapter core shaft and the central shaft, and a water inlet passage and a water outlet passage connecting the ring channels are arranged inside these structures to form a double passage, which not only can realize the connected circulation of the cooling channel, but also can increase the cooling and heat dissipation of the internal structure of the turntable, thereby improving the heat dissipation effect.

[0019] According to a further technical solution, the inner shaft cooling channel is connected to the fourth water outlet cooling channel, and extends radially along the inner shaft, then extends axially upward, and then extends radially, and then extends axially downward to be connected to the cooling water outlet channel, and the cooling water outlet channel is fixed on the turntable shell.

[0020] Beneficial effect: The inner shaft is rotatably connected to the rotary joint, which generates a lot of heat. By setting an inner shaft cooling channel on the inner shaft, the heat dissipation and cooling of the inner shaft can be accelerated. The inner shaft cooling channel covers the sealing structure layout area of ​​the inner shaft of the rotary joint, and the heat generated by the rotating outer sleeve and the inner shaft is cooled in time, thereby maintaining the temperature of the inner shaft stable, reducing thermal deformation, and improving the stability of the turntable operation.

[0021] According to a further technical solution, the leakage channel comprises a lower leakage channel, a middle leakage channel and an upper leakage channel, the upper leakage channel is arranged at the upper part of the fitting place between the inner shaft and the rotating outer sleeve, the middle leakage channel is arranged at the middle part of the fitting place between the inner shaft and the rotating outer sleeve, the lower leakage channel is arranged at the lower part of the fitting place between the inner shaft and the rotating outer sleeve, and the upper leakage channel, the middle leakage channel and the lower leakage channel are all connected to the leakage pipeline arranged in the inner shaft.

[0022] Beneficial effect: The leakage channel can leak cooling medium to dissipate heat at the partial clearance fit between the inner shaft and the rotary joint, and at the same time cool the contact seal, thereby increasing the service life of the contact seal.

[0023] According to a further technical solution, the sealing structure includes a contact seal arranged along the axial direction between the matching surfaces of the inner shaft and the rotating outer sleeve.

[0024] Beneficial effect: The contact seal separates the working channel, the cooling channel and the leakage channel, preventing the cooling medium and the working medium from entering the cavity.

[0025] In summary, the present invention has the following beneficial effects: the water inlet channel and the water outlet channel of the cooling structure can realize the surrounding and penetration of the central structure of the turntable, and the water inlet channel and the water outlet channel are double cooling water inlet and double cooling water outlet structures, which effectively improve the cooling effect, achieve the purpose of cooling the inner shaft, rotating sleeve, adapter core shaft, center shaft and turntable bearing, greatly reduce the heat generation of the turntable rotary joint, improve the processing accuracy and precision, and by setting a sealing structure, the working channel and the cooling channel are separated, and the problem of cavity cross-talk between the cooling medium used to cool the turntable and the working medium of the rotary joint is solved, and cooling water can be passed into the cooling channel for cooling, and hydraulic oil or compressed air can be passed into the working channel of the rotary joint to realize related actions, which solves the problem that the working medium of the traditional rotary joint working channel must be the same as the cooling medium of the cooling channel, and the cooling effect of the cooling water passed into the cooling channel is better than the traditional practical cooling effect of using hydraulic oil, thereby improving the processing accuracy of the machine tool or machining center equipped with the turntable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the internal structure of this application;

[0028] Figure 2 It is a schematic diagram of the central axis of the present application and the fourth water inlet passage, the second water outlet passage, and the first water outlet passage therein;

[0029] Figure 3 This application Figure 1 The enlarged schematic diagram of point A in the middle;

[0030] Figure 4 It is a partial enlarged cross-sectional schematic diagram of the first water outlet passage in the present application;

[0031] Figure 5 It is a partially enlarged cross-sectional schematic diagram of the second water outlet passage in the present application.

[0032] In the figure: 100, turntable housing; 101, motor stator; 102, motor rotor; 103, adapter mandrel; 104, center shaft; 105, turntable bearing; 106, work table; 107, brake part; 108, rotor connecting plate; 109, contact seal; 110, inner shell; 111, inner shaft; 112, rotating outer sleeve; 120, cooling water inlet channel; 130, cooling water outlet channel; 201, first water inlet cooling loop; 202, second water inlet cooling loop; 203, third water inlet cooling loop; 204, fourth water inlet cooling loop; 205, fourth water inlet passage; 206, first water inlet passage; 207, second water inlet passage; 208, third water inlet passage; 301, first water outlet cooling loop; 302, second water outlet cooling loop; 303, third water outlet cooling loop; 304, fourth water outlet cooling loop; 305, second water outlet passage; 306, first water outlet passage; 307, inner shaft cooling channel; 308, third water outlet passage; 309, fourth water outlet passage; 401, lower leakage channel; 402, middle leakage channel; 403, upper leakage channel; 500, working channel. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the examples, but the embodiments of the present invention are not limited thereto. The technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] Combined with Figures 1 to 5 The figure shows a turntable cooling structure, in which the turntable is a direct-drive turntable, including a turntable shell 100, an inner shaft 111 fixed on the turntable shell 100, a rotating outer sleeve 112 rotatably arranged on the outer periphery of the inner shaft 111, a transfer core shaft 103 fixed to the rotating outer sleeve 112, a center shaft 104 fixed to the transfer core shaft 103, a turntable bearing 105 installed between the outer periphery of the center shaft 104 and the inner wall of the turntable shell 100, a working table 106 and a direct-drive motor fixed to the center shaft 104, a working channel 500 arranged between the inner shaft 111 and the rotating outer sleeve 112, and a brake part 107 installed on the outer periphery of the center shaft 104.

[0039] Specifically, the inner shaft 111 and the rotating outer sleeve 112 form a rotating joint, the inner shaft 111 is inserted into the rotating outer sleeve 112, and the inner shaft 111 and the rotating outer sleeve 112 are clearance-matched, and bearings are installed at the upper and lower ends of the fitting, so that the rotating outer sleeve 112 is rotatably installed on the inner shaft 111, and the inner shell 110 is installed in the turntable shell 100 by bolts. The turntable shell 100 and the inner shell 110 are castings. The inner shaft 111 is vertically installed at the center position of the turntable shell 100 and is fixed to the inner shell 110. The direct-drive motor includes a motor stator 101 and a motor rotor 102. The motor stator 101 is fixed on the inner wall of the turntable shell 100, and the bottom of the motor stator 101 is fixed to the top surface of the inner shell 110. The machine rotor 102 is rotatably arranged in the motor stator 101, and the top of the motor rotor 102 is fixed with a rotor connecting plate 108 by bolts, and the top of the rotor connecting plate 108 is fixed to the center shaft 104 by bolts, and the transfer core shaft 103 is arranged in the center shaft 104, and the transfer core shaft 103 and the center shaft 104 are fixed by bolts. The center shaft 104 is stepped, and the diameter of the top is larger than the diameter of the bottom. The rotating outer sleeve 112 is fixed to the inner ring of the transfer core shaft 103 by bolts, and the rotating outer sleeve 112 is rotatably installed on the outer periphery of the inner shaft 111. A work table 106 is fixed to the top surface of the center shaft 104 by bolts, and the upper part of the rotating outer sleeve 112 is located in the center hole of the work table 106.

[0040] The cooling structure includes a water inlet channel, a water outlet channel and a leakage channel. The water inlet channel and the water outlet channel form a cooling channel. A cooling medium flows in the cooling channel for cooling the turntable. The water inlet channel and the water outlet channel penetrate and surround the inner shaft 111, the rotating outer sleeve 112, the transfer core shaft 103 and the center shaft 104. A working medium flows in the working channel 500.

[0041] In one embodiment, the water inlet channel includes a water inlet cooling loop and a water inlet connecting passage, the water inlet cooling loop is connected to the water inlet connecting passage, and the water outlet channel includes a water outlet cooling loop and a water outlet connecting passage.

[0042] Specifically, the water inlet cooling channel includes a first water inlet cooling channel 201, a second water inlet cooling channel 202, a third water inlet cooling channel 203 and a fourth water inlet cooling channel 204. The first water inlet cooling channel 201 is opened on the circumference of the inner periphery of the rotating sleeve 112, the second water inlet cooling channel 202 is opened on the circumference of the outer periphery of the rotating sleeve 112, the third water inlet cooling channel 203 is opened on the circumference of the outer periphery of the transfer core shaft 103, and the fourth water inlet cooling channel 204 is opened on the outer circumference of the central shaft 104 in contact with the turntable bearing 105, specifically, on the outer peripheral surface of the bottom of the central shaft 104.

[0043] The water inlet connecting passage comprises a first water inlet passage 206, a second water inlet passage 207, a third water inlet passage 208, and a fourth water inlet passage 205. The first water inlet passage 206 is arranged in the inner shaft 111 and extends along the axial direction of the inner shaft 111, and is used to connect the cooling water inlet channel 120 and the first water inlet cooling ring channel 201. The cooling water inlet channel 120 is fixed on the inner shell 110. The top of the cooling water inlet channel 120 is bent 90 degrees and inserted into the inner shaft 111, and is connected with the bottom of the first water inlet passage 206. The bottom of the cooling water inlet channel 120 is connected to a cooling water source. The second water inlet passage 207 is arranged in the rotating outer sleeve 112 and extends along the radial direction of the rotating outer sleeve 112. The third water inlet passage 208 is provided in the adapter core shaft 103 and is extended along the radial direction of the adapter core shaft 103, so as to connect the second water inlet cooling channel 202 and the third water inlet cooling channel 203. The fourth water inlet passage 205 is provided in the center shaft 104, and the fourth water inlet passage 205 first flows outward from the third water inlet cooling channel 203 along the radial direction of the center shaft 104, and then flows downward along the axial direction of the center shaft 104, and then flows outward along the radial direction, so as to connect the third water inlet cooling channel 203 and the fourth water inlet cooling channel 204.

[0044] In one embodiment, taking into account the heat dissipation requirements and processing costs, two of the first water inlet passage 206, the second water inlet passage 207, the third water inlet passage 208, and the fourth water inlet passage 205 are each provided, and are symmetrically arranged relative to the axis of the inner shaft 111. By providing multiple first water inlet passages 206, the second water inlet passages 207, the third water inlet passages 208, and the fourth water inlet passages 205, a double cooling water inlet and a double cooling water outlet structure are formed, and two circulation loops are formed, so that the cooling water flows stably, the heat is evenly dissipated, and the cooling effect is improved.

[0045] In one embodiment, the water outlet cooling ring includes a first water outlet cooling ring 301, a second water outlet cooling ring 302, a third water outlet cooling ring 303 and a fourth water outlet cooling ring 304. The first water outlet cooling ring 301 is opened on the central axis 104, specifically on the horizontal plane in the middle of the step structure of the central axis 104, and is a circular groove type, close to the upper part of the turntable bearing 105. The second water outlet cooling ring 302 is opened on the circumference of the outer periphery of the transfer core shaft 103, the third water outlet cooling ring 303 is opened on the circumference of the outer periphery of the rotating sleeve 112, and the fourth water outlet cooling ring 304 is opened on the circumference of the inner periphery of the rotating sleeve 112.

[0046] In one embodiment, the water outlet connecting passage includes a first water outlet passage 306, a second water outlet passage 305, a third water outlet passage 308 and a fourth water outlet passage 309. The first water outlet passage 306 is opened in the central axis 104. The first water outlet passage 306 first extends radially inward along the central axis 104, then extends axially upward, then extends radially outward, and then extends axially downward to connect the fourth water inlet cooling channel 204 and the first water outlet cooling channel 301. After the fourth water inlet cooling channel 204 is filled, the cooling water first flows radially inward along the central axis 104 through the first water outlet passage 306, then flows axially upward along the central axis 104, then flows radially outward along the central axis 104, and then enters the first water outlet cooling channel 301 along the axial downward direction of the central axis 104. The second water outlet passage 305 is opened in the central axis 104. 04, the second water outlet passage 305 first extends axially upward along the center axis 104, and then extends radially inward, connecting the first water outlet cooling ring 301 and the second water outlet cooling ring 302, the third water outlet passage 308 is opened in the transfer core shaft 103, the third water outlet passage 308 extends radially inward along the transfer core shaft 103, connecting the second water outlet cooling ring 302 and the third water outlet cooling ring 303, the fourth water outlet passage 309 is opened in the rotating outer sleeve 112, extends radially inward along the rotating outer sleeve 112, connecting the third water outlet cooling ring 303 and the fourth water outlet cooling ring 304, the first water outlet passage 306, the second water outlet passage 305, the third water outlet passage 308 and the fourth water outlet passage 309 are each provided with two, and are symmetrically arranged relative to the axis of the inner shaft 111.

[0047] Specifically, the fourth water inlet passage 205 is drilled from the bottom during axial processing, and after the axial hole is drilled, the bottom needs to be closed, for example, using a sealing plug for sealing. When the first water outlet passage 306 is drilled, the radial holes on the upper side are first processed from the outer periphery to the inside. After processing, the radial holes on the upper side need to be closed on the outside. When processing the axial holes, holes are drilled from the bottom to the top, and the bottom needs to be closed after the drilling is completed.

[0048] In one embodiment, an inner shaft cooling channel 307 is opened in the inner shaft 111, and the inner shaft cooling channel 307 is connected to the fourth water outlet cooling ring 304. The inner shaft cooling channel 307 is connected to the cooling water outlet channel 130, and the cooling water outlet channel 130 is fixed on the inner shell 110. The inner shaft cooling channel 307 first extends radially inwardly of the inner shaft 111, then extends axially upwardly along the inner shaft 111, then extends radially along the inner shaft 111, and then extends axially downwardly along the inner shaft 111. The inner shaft cooling channel 307 covers the contact seal 109 arrangement area of ​​the inner shaft 111 of the rotary joint, timely cools the heat generated by the rotating outer sleeve 112, the inner shaft 111 and the contact seal 109, keeps the temperature of the inner shaft 111 stable, reduces thermal deformation, and improves the stability of the turntable operation. The top of the cooling water outlet channel 130 is bent ninety degrees and inserted into the inner shaft 111, and is connected to the bottom of the inner shaft cooling channel 307.

[0049] In one embodiment, the leakage channel includes a lower leakage channel 401, a middle leakage channel 402 and an upper leakage channel 403, the upper leakage channel 403 is arranged at the upper part of the inner shaft 111 and the rotating outer sleeve 112, the middle leakage channel 402 is arranged at the middle part of the inner shaft 111 and the rotating outer sleeve 112, and the lower leakage channel 401 is arranged at the lower part of the inner shaft 111 and the rotating outer sleeve 112. The upper leakage channel 403, the middle leakage channel 402 and the lower leakage channel 401 are all connected to the leakage pipeline opened in the inner shaft 111, and cooling water is passed into the leakage pipeline.

[0050] In one embodiment, a contact seal 109 is axially arranged between the contact surfaces of the inner shaft 111 and the rotating outer sleeve 112 .

[0051] Specifically, the contact seal 109 is used to seal the working channel 500, the water inlet channel, the water outlet channel and the gap between the inner shaft 111 and the rotating outer sleeve 112, and the inner shaft 111, and separate the working channel 500 from the cooling channel. A part of the working channel 500 is arranged in the inner shaft 111, and a part is arranged on the inner ring of the rotating outer sleeve 112. The two parts of the working channel 500 are connected and connected to the load on the work table 106. There are multiple working channels 500. A working medium is introduced into the working channel 500. For example, gas or oil can be introduced into the working channel 500 for braking, and if the load on the work table 106 requires oil pressure to clamp the workpiece, gas or oil can be introduced into another working channel 500 to achieve related clamping or clamping actions.

[0052] There are multiple contact seals 109. A contact seal 109 is arranged at the top of the matching point between the inner shaft 111 and the rotating outer sleeve 112. The contact seal 109 is located between the upper leakage channel 403 and the top working channel 500. Two contact seals 109 are arranged in the middle of the matching point between the inner shaft 111 and the rotating outer sleeve 112. The two contact seals 109 are located on the upper and lower sides of the middle leakage channel 402. Two contact seals 109 are arranged at the bottom of the matching point between the inner shaft 111 and the rotating outer sleeve 112. The two contact seals 109 are located on the upper and lower sides of the lower leakage channel 401, and the bottommost contact seal 109 is a lip seal, which separates the leakage channel from the cooling channel and the working channel 500 to prevent the working medium in the working channel 500 from colliding with the cooling medium in the cooling channel and the leakage channel.

[0053] The cooling process of this turntable cooling structure is as follows:

[0054] Water inlet: The cooling water enters the cooling water inlet channel 120, and then flows into the first water inlet channel 206 through the cooling water inlet channel 120, and then enters the first water inlet cooling ring 201 to cool the contact surface between the inner shaft 111 and the rotating outer sleeve 112 and the inner shaft 111, and then flows into the second water inlet cooling ring 202 through the second water inlet channel 207 to cool the contact surface between the rotating outer sleeve 112 and the transfer core shaft 103 and the interior of the rotating outer sleeve 112, and then the cooling water flows from the second water inlet cooling ring 202 through the third water inlet channel 208 to the third water inlet cooling ring 203 to cool the contact surface between the transfer core shaft 103 and the center shaft 104 and the interior of the transfer core shaft 103, and then the cooling water enters the fourth water inlet cooling ring 204 from the third water inlet cooling ring 203 through the fourth water inlet channel 205 to cool the contact surface between the center shaft 104 and the turntable bearing 105 and the interior of the center shaft 104.

[0055] Water outlet: Cooling water enters the first water outlet cooling channel 301 from the fourth water inlet cooling channel 204 through the first water outlet passage 306 to cool the contact surface between the central shaft 104 and the turntable bearing 105 and the interior of the central shaft 104. Then, it enters the second water outlet cooling channel 302 from the first water outlet cooling channel 301 through the second water outlet passage 305 to cool the contact surface between the transfer core shaft 103 and the central shaft 104 and the interior of the central shaft 104. Then, the cooling water enters the second water outlet cooling channel 302 through the third water outlet passage 306 to cool the contact surface between the transfer core shaft 103 and the central shaft 104 and the interior of the central shaft 104. 08 enters the third water outlet cooling loop 303 to cool the contact surface between the transfer shaft 103 and the center shaft 104 as well as the interior of the transfer shaft 103, and then enters the fourth water outlet cooling loop 304 from the third water outlet cooling loop 303 through the fourth water outlet passage 309 to cool the contact surface between the rotating outer sleeve 112 and the inner shaft 111 as well as the interior of the rotating outer sleeve 112, and then flows out from the fourth water outlet cooling loop 304 through the inner shaft cooling channel 307 to the cooling water outlet channel 130 to cool the interior of the inner shaft cooling channel 307.

[0056] The cooling water enters the lower leakage channel 401, the middle leakage channel 402 and the upper leakage channel 403 along the leakage pipeline. The cooling water leaked out from the lower leakage channel 401, the middle leakage channel 402 and the upper leakage channel 403 cools the mating surfaces of the inner shaft 111 and the rotating outer sleeve 112 and the contact seal 109, and at the same time takes away the heat generated by the friction of the contact seal 109, thereby maintaining the internal temperature of the turntable stable and improving the processing accuracy.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A turntable cooling structure, the turntable comprising a turntable housing (100), an inner shaft (111) fixed to the turntable housing (100), a rotating outer sleeve (112) rotatably arranged on the outer periphery of the inner shaft (111), a transfer core shaft (103) fixed to the rotating outer sleeve (112), a center shaft (104) fixed to the transfer core shaft (103), a turntable bearing (105) installed between the outer periphery of the center shaft (104) and the inner wall of the turntable housing (100), and a working channel (500) arranged between the inner shaft (111) and the rotating outer sleeve (112), characterized in that: The cooling structure comprises a water inlet channel, a water outlet channel and a leakage channel, wherein the water inlet channel and the water outlet channel penetrate and surround the inner shaft (111), the rotating outer sleeve (112), the transfer core shaft (103) and the central shaft (104), wherein a sealing structure is installed between the inner shaft (111) and the rotating outer sleeve (112), and an inner shaft cooling channel (307) is provided in the inner shaft (111); the sealing structure comprises a mating surface provided on the inner shaft (111) and the rotating outer sleeve (112); a contact seal (109) arranged axially between the first and second water inlet passages; the water inlet passage comprises a water inlet cooling ring passage and a water inlet connecting passage, the water inlet cooling ring passage is connected to the water inlet connecting passage, the water outlet passage comprises a water outlet cooling ring passage and a water outlet connecting passage; the water inlet connecting passage comprises a first water inlet passage (206), a second water inlet passage (207), a third water inlet passage (208), and a fourth water inlet passage (205); the first water inlet passage (206), the second water inlet passage (207), the third water inlet passage (208), and the fourth water inlet passage (205); 08), at least two fourth water inlet passages (205) are provided, and are evenly arranged in a circular shape relative to the axis of the inner shaft (111); the water outlet cooling ring channel comprises a first water outlet cooling ring channel (301), a second water outlet cooling ring channel (302), a third water outlet cooling ring channel (303) and a fourth water outlet cooling ring channel (304); the water outlet communication passage comprises a first water outlet passage (306), a second water outlet passage (305), a third water outlet passage (308) and a fourth water outlet passage (309); At least two of the first water outlet passage (306), the second water outlet passage (305), the third water outlet passage (308) and the fourth water outlet passage (309) are provided, and are evenly arranged in a circular shape relative to the axis of the inner shaft (111); the inner shaft cooling channel (307) is connected to the fourth water outlet cooling ring channel (304), and extends in the radial direction of the inner shaft (111), then extends axially upward, then extends radially again, and then extends axially downward to be connected to the cooling water outlet passage (130).

2. A turntable cooling structure according to claim 1, characterized in that: The water inlet cooling ring channel comprises a first water inlet cooling ring channel (201), a second water inlet cooling ring channel (202), a third water inlet cooling ring channel (203) and a fourth water inlet cooling ring channel (204), wherein the first water inlet cooling ring channel (201) is arranged on a circumference of the inner periphery of the rotating outer sleeve (112), the second water inlet cooling ring channel (202) is arranged on a circumference of the outer periphery of the rotating outer sleeve (112), the third water inlet cooling ring channel (203) is arranged on a circumference of the outer periphery of the transfer core shaft (103), and the fourth water inlet cooling ring channel (204) is arranged on a circumference of the outer periphery of the central shaft (104).

3. A turntable cooling structure according to claim 2, characterized in that: The first water inlet passage (206) is opened in the inner shaft (111) and connects the cooling water inlet passage (120) and the first water inlet cooling loop (201); the cooling water inlet passage (120) is fixed on the turntable shell (100); the second water inlet passage (207) is opened in the rotating outer sleeve (112) and connects the first water inlet cooling loop (201) and the second water inlet cooling loop (202); the third water inlet passage (208) is opened in the transfer core shaft (103) and connects the second water inlet cooling loop (202) and the third water inlet cooling loop (203); the fourth water inlet passage (205) is opened in the central shaft (104) and connects the third water inlet cooling loop (203) and the fourth water inlet cooling loop (204).

4. A turntable cooling structure according to claim 3, characterized in that: The first water outlet cooling ring channel (301) is opened on the central axis (104), the second water outlet cooling ring channel (302) is opened on the circumference of the outer circumference of the transfer core shaft (103), the third water outlet cooling ring channel (303) is opened on the circumference of the outer circumference of the rotating sleeve (112), and the fourth water outlet cooling ring channel (304) is opened on the circumference of the inner circumference of the rotating sleeve (112).

5. A turntable cooling structure according to claim 4, characterized in that: The first water outlet passage (306) is opened in the central shaft (104) and connects the fourth water inlet cooling loop (204) and the first water outlet cooling loop (301); the second water outlet passage (305) is opened in the central shaft (104) and connects the first water outlet cooling loop (301) and the second water outlet cooling loop (302); the third water outlet passage (308) is opened in the transfer core shaft (103) and connects the second water outlet cooling loop (302) and the third water outlet cooling loop (303); the fourth water outlet passage (309) is opened in the rotating outer sleeve (112) and connects the third water outlet cooling loop (303) and the fourth water outlet cooling loop (304).

6. A turntable cooling structure according to claim 5, characterized in that: The cooling water outlet channel (130) is fixed on the turntable shell (100).

7. The turntable cooling structure according to claim 1, characterized in that: The leakage channel comprises a lower leakage channel (401), a middle leakage channel (402) and an upper leakage channel (403); the upper leakage channel (403) is arranged at the upper part of the fitting place between the inner shaft (111) and the rotating outer sleeve (112); the middle leakage channel (402) is arranged at the middle part of the fitting place between the inner shaft (111) and the rotating outer sleeve (112); the lower leakage channel (401) is arranged at the lower part of the fitting place between the inner shaft (111) and the rotating outer sleeve (112); the upper leakage channel (403), the middle leakage channel (402) and the lower leakage channel (401) are all in communication with a leakage pipeline arranged in the inner shaft (111).

Images