Rotary switching device and lead screw provided with same

Abstract

A rotary switching device and a screw rod provided with the rotary switching device comprise a rotary part, a screw rod and a screw rod, and a hole groove penetrating through the rotary part from inside to outside is formed in the center of the rotary part; the inner end of the fixing part is open and provided with a rotating inner groove, the outer end of the fixing part is provided with a connecting hole and communicated with the rotating inner groove, a bearing is arranged in the rotating inner groove, the rotating part penetrates through the open end, is installed on the bearing and rotates in the rotating inner groove, and the outer end of the hole groove is communicated with the connecting hole. The cooling device has the beneficial effects that the rotating part penetrates through the fixed part and is mounted on the bearing, so that the rotating part can rotate relative to the fixed part, a liquid discharging chamber for discharging cooling liquid is formed between the rotating part and the fixed part, and the rotating part and the fixed part are connected at the joint of the rotating part and the fixed part, namely, the two ends of the liquid discharging chamber; the first sealing element and the second sealing element are respectively arranged, so that the cooling liquid can be effectively prevented from flowing back without depending on a bearing seat of an external transmission system, and a good sealing effect is realized.

Description

Technical Field

[0001] The invention relates to the technical field of motor screw transmission switching, and in particular to a rotation switching device and a screw installed thereon. Background Art

[0002] In the screw-nut system, one end of the screw is connected to the motor, which drives the screw to rotate and drives the nut to move linearly along the screw. When the motor rotates a certain number of times, the nut should move accurately to the preset distance. However, the screw generates heat during rotation, causing the temperature to rise. The physical properties of thermal expansion and contraction cause the length of the screw to change. As a result of the elongation, the lead of the nut (that is, the distance the nut travels on the screw for each rotation) becomes longer, thereby affecting the positioning accuracy of the nut.

[0003] The existing Chinese patent publication number (CN 216045363U) discloses a rotary joint with cooling function, which is used to cool a hollow screw rod, and is characterized in that it comprises: a rotating module and a fixing module; the rotating module is arranged on the hollow screw rod, and is used to transport cooling liquid to the inside of the hollow screw rod; the fixing module is arranged on one side of the rotating module. This technical solution has the following problems: 1. The sealing structure between the rotating module and the fixed module is unreasonable: The comparative document describes a rotating module, which includes a rotating shaft and a first seal (ceramic ring), and the first seal is installed on the rotating shaft; the fixed module includes a bearing member and a fixed shaft, the bearing member is fixedly connected to the bearing seat by bolts, and the fixed shaft is installed on the bearing member by a limiting assembly (composed of a second limiting member and an elastic member) and contacts with the first seal. When the rotating shaft rotates relative to the bearing member, the sealing of the connection part is achieved by the contact between the surface of the ceramic ring and the surface on the fixed shaft.

[0004] 2. The rotation relationship between the rotating module and the fixed module has a large error fit: Since the rotating module is fixedly hooked inside the hollow screw, and the fixed module is fixed to the end of the outer shell of the bearing; there are the following errors between the end of the bearing and the inside of the hollow screw: 1. The coaxiality error between the outer wall of the screw and the inside of the hollow screw, 2. The coaxiality error between the outer wall of the screw and the outer shell of the bearing, 3. The coaxiality error between the outer shell of the bearing and the end of the outer shell. When the hollow screw drives the rotating module to rotate relative to the bearing seat and the fixed module connected to it, due to the large number of interconnected parts involved and the problem of machining accuracy of the assembly surfaces of each part, it cannot be completely guaranteed that each surface is perpendicular to the center line of the rotating shaft, which results in the surface of the ceramic ring being unable to be perpendicular to the center line of the rotating shaft. At the same time, the fixed shaft is affected by the compression and vibration of the limit assembly, which causes the surface of the first seal (i.e., the ceramic ring) on ​​the rotating shaft to vibrate with the surface of the fixed shaft. This vibration can cause the seal to fail, and the coolant may penetrate into the bearing seat when it refluxes, which in turn has an adverse effect on the bearing in the bearing seat, resulting in increased friction, reduced transmission efficiency, and jitter and noise. In addition, wear and corrosion of the bearings, screws and nuts will further reduce the motion accuracy of the system and affect the accuracy of processing or operation.

[0005] 3. After the seal fails, coolant leaks. The coolant is not discharged directly, but enters the inside of the bearing, affecting the operation of the bearing. Summary of the invention

[0006] The present invention aims to solve the above problems existing in the prior art and provides a rotary adapter device with an integrated cooling system for controlling the temperature of a screw rod and a screw rod installed thereon to improve the positioning accuracy and reliability of a nut.

[0007] The present invention solves the technical problem by adopting a technical solution: the rotary switching device comprises: A rotating component, with a hole slot penetrating inside and outside at the center thereof; A fixed component, the inner end of which is open and provided with a rotating inner groove, the outer end of which is provided with a connecting hole and connected to the rotating inner groove, the rotating inner groove has a bearing built therein, the rotating component is inserted from the open end and installed on the bearing and rotates in the rotating inner groove, and the outer end of the hole groove is connected to the connecting hole; A cooling pipe is connected in the hole groove and passes through the inner end of the rotating component.

[0008] Preferably, a sealing joint structure is provided between the connecting hole and the rotating inner groove, and the rotating component is connected to the sealing joint structure and sealed with the connecting hole.

[0009] Preferably, the sealing joint structure includes a joint groove located in the inner end direction of the connecting hole, a sealing groove located in the inner end direction of the joint groove and having a larger inner diameter, the rotating component extends toward the outer end and rotationally engages the hole groove in the joint groove, and a first seal is installed between the extension of the rotating component and the sealing groove.

[0010] Preferably, the inner end of the rotating component is provided with a connector extending outward, and the hole groove passes through the connector.

[0011] Preferably, a reflux channel is formed between the inner section of the hole groove and the outer wall of the cooling pipe, and a discharge hole communicating with the reflux channel is opened on the hole wall of the inner section of the hole groove.

[0012] Preferably, a mass discharge chamber is formed between the outer end of the rotating component and the rotating inner groove, and the mass discharge chamber is provided with a mass discharge hole penetrating from the outer wall of the fixed component; the outer end of the discharge hole is connected to the mass discharge chamber.

[0013] Preferably, the fixing component includes an end cover forming an opening, a joint seat having the connecting hole provided at the outer end, and a rotating part whose inner and outer ends are connected and located between the end cover and the joint seat. The end cover, the rotating part and the joint seat are connected by bolts, and the rotating inner groove is formed in the opening of the fixing component.

[0014] Preferably, a first rotation groove is provided on the inner end of the end cover, a locking nut is threadedly connected on the outer wall of the rotating component, a second rotation groove is provided on the outer end of the locking nut, the lower groove wall of the first rotation groove is provided in the second rotation groove, and the upper groove edge of the second rotation groove is provided in the first rotation groove.

[0015] Preferably, the joint seat is located at the inner end of the sealing groove and has a mass discharge groove with a larger inner diameter. A limit plate for limiting the movement of the first sealing member is connected to the bottom wall of the mass discharge groove by bolts. The rotating component extends to the outer end through the limit plate and rotates the hole groove to engage in the engaging groove.

[0016] Preferably, the rotating inner groove has a second seal built in it, the rotating component is installed in the second seal, the second seal is located on the outer end of the rotating component, and the outer end of the rotating part, the second seal, the outer end of the rotating component, the limiting plate, the sealing joint structure and the mass discharge groove enclose the mass discharge chamber.

[0017] Preferably, the distance between the discharge hole and the hole groove gradually increases from the position where the discharge hole communicates with the reflux channel to the position where the discharge hole communicates with the mass discharge chamber.

[0018] Preferably, a first limit block is provided on the outer end of the end cover, and a second limit block is provided on the rotating inner groove, and there is a distance between the first limit block and the second limit block, and the first limit block, the groove wall of the rotating inner groove and the second limit block form a first limit groove; a third limit block is provided on the outer end of the locking nut, and a fourth limit block is provided on the outer wall of the rotating component, and the distance between the third limit block and the fourth limit block is the same as the distance between the first limit block and the second limit block, and a second limit groove is formed between the third limit block, the outer wall of the rotating component and the fourth limit block, and the outer ring of the bearing is provided in the first limit groove, and the inner ring of the bearing is provided in the second limit groove.

[0019] Preferably, the second limit block, the fourth limit block and the second seal located on the outer end of the rotating component together enclose and form a protective cavity, the protective cavity is located between the bearing and the mass discharge chamber, and at least one drainage hole is opened on the rotating part, and the drainage hole is connected to the protective cavity.

[0020] Preferably, a connecting groove with a larger inner diameter communicating with the hole groove is provided in the extension of the rotating component, and a connecting portion is provided at the outer end of the cooling pipe, and the connecting portion is bolted to the connecting groove; or the connecting portion is interference fit with the connecting groove.

[0021] The present invention solves the above technical problems and also provides a screw rod installed with the above-mentioned rotation adapter device, which includes a nut threadedly connected to the screw rod, and a driving member used to drive the screw rod to rotate and connected to the inner end of the screw rod. A cooling hole is opened on the center line of the screw rod, the inner end of the rotating component is connected to the cooling hole, and a cooling pipe passes through the inner end of the rotating component and extends into the cooling hole.

[0022] The beneficial effects of the present invention are as follows: the rotating component penetrates into the fixed component and is installed on the bearing, so that the rotating component can rotate relative to the fixed component, and a drainage chamber for discharging coolant is formed between the rotating component and the fixed component, and a first seal and a second seal are respectively arranged at the connection between the rotating component and the fixed component, that is, at both ends of the drainage chamber, which ensures that even without relying on the bearing seat of the external transmission system, the coolant can be effectively prevented from flowing back and a good sealing effect can be achieved. This rotary joint device and the external bearing seat are two independent systems. During the drainage process, the coolant enters the drainage chamber through the discharge hole and is then discharged from the drainage hole, which reduces the structural matching requirements and improves the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the structure of the rotary switching device in the first embodiment; Figure 2 is a cross-sectional view of the rotary switching device in the first embodiment; Figure 3 for Figure 2 A magnified view of the structure at center A; Figure 4 is a cross-sectional view of the fixing component in the first embodiment; Figure 5 Schematic diagram of the structure of the rotating component in the first embodiment; Figure 6 This is an exploded view of the structure of the rotary switching device in the first embodiment; Figure 7 This is a schematic diagram of the structure of the rotary switching device and the screw rod in the second embodiment; Figure 8 for Figure 7 A magnified view of the structure at point B.

[0024] Description of reference numerals: 1. Fixed component; 10. End cover; 11. Rotating part; 12. Joint seat; 100. Rotating inner groove; 101. Connecting hole; 102. Bearing; 103. Engaging groove; 104. Sealing groove; 105. First sealing member; 106. Exhaust chamber; 107. Exhaust hole; 108. First rotating groove; 109. Drain hole; 110. Exhaust groove; 111. Limiting piece; 112. Second sealing member; 113. First limiting block; 114. Second limiting block; 115. First limiting groove; 116. Protective cavity; 2. Rotating member; 20. Locking nut; 200. Second rotating groove; 201. Hole groove; 202. Connector; 203. Third limiting block; 204. Fourth limiting block; 205. Second limiting groove; 206. Reflux channel; 207. Discharge hole; 208. Connecting groove; 3. Cooling pipe; 300. Connecting part; 4. Screw rod; 400. Nut; 401. Cooling hole. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings: Embodiment 1 See attached Figures 1 to 6 As shown: A rotary switching device, comprising: a rotating component 2, at the center of which is provided with a hole groove 201 that penetrates inside and outside; a fixed component 1, the inner end of which is open and provided with a rotating inner groove 100, the outer end of which is provided with a connecting hole 101 and connected to the rotating inner groove 100, the rotating inner groove 100 has a bearing 102 built in, the rotating component 2 penetrates from the open end and is installed on the bearing 102 and rotates in the rotating inner groove 100, the outer end of the hole groove 201 is connected to the connecting hole 101; a cooling pipe 3, which is connected in the hole groove 201 and passes through the inner end of the rotating component 2.

[0026] The inner end of the fixed component 1 is open and provided with a rotating inner groove, and the outer end is provided with a connecting hole 101 for connecting an external cooling medium. The connecting hole 101 is connected to the rotating inner groove 100. The rotating component 2 is designed to penetrate from the open end of the fixed component 1 and then rotate freely in the rotating inner groove 100, allowing a dynamic connection to be formed between the rotating component 2 and the fixed component 1 to achieve the transmission of the rotating motion. A hole groove 201 is provided in the center of the rotating component 2. This hole groove 201 runs through both ends of the rotating component 2 and is used to accommodate the cooling pipe 3. The design of the hole groove 201 not only ensures the smooth installation of the cooling pipe 3, but also ensures the stability of the cooling pipe 3 when the rotating component 2 rotates. The cooling pipe 3 is designed to pass through the hole groove 201 in the center of the rotating component 2 and extend from one end of the rotating component 2. The rotating inner groove 100 is a part of the fixed component 1 and is designed to accommodate the bearing 102 and the rotating component 2. The inner surface of the rotating inner groove 100 is tightly matched with the bearing 102 to reduce the friction between the two. The bearing 102 is installed in the rotating inner groove 100, and its outer ring is tightly matched with the rotating inner groove 100, while the inner ring is tightly matched with the shaft of the rotating component 2. The function of the cooling pipe 3 is to introduce cooling medium to take away the heat generated by the rotating component 2 during operation to prevent thermal expansion caused by excessive temperature.

[0027] It should be noted that in this embodiment, the cooling medium may be coolant, water or air, but is not limited to the above-mentioned media and may be set according to circumstances.

[0028] Preferably, if Figure 2 , Figure 4 and Figure 6 As shown, a sealing joint structure is provided between the connecting hole 101 and the rotating inner groove 100 , and the rotating component 2 is connected to the sealing joint structure and sealed with the connecting hole 101 .

[0029] The main function of the sealing joint structure is to create a reliable seal between the rotating component 2 and the fixed component 1, and the integrity of the seal can be maintained even when the rotating component 2 rotates.

[0030] Furthermore, if Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the sealing joint structure includes a joint groove 103 located at the inner end direction of the connecting hole 101, and a sealing groove 104 located at the inner end direction of the joint groove 103 and having a larger inner diameter. The rotating component 2 extends toward the outer end and rotationally engages the hole groove 201 in the joint groove 103. A first sealing member 105 is installed between the extended part of the rotating component 2 and the sealing groove 104.

[0031] The joint groove is part of the sealing joint structure and is located at the inner end direction of the connecting hole 101. The joint groove 103 is designed to allow the outer end of the rotating component 2 to be accurately inserted and rotated to engage. At the same time, in order to improve the sealing performance and facilitate the installation of the seal, the sealing groove 104 is located at the inner end direction of the joint groove 103, and its inner diameter is slightly larger than the joint groove 103 so as to accommodate the first seal 105. The function of the sealing groove 104 is to ensure the sealing between the rotating component 2 and the fixed component 1 to prevent any cooling medium from leaking from the connection between the rotating component 2 and the fixed component 1. The first seal 105 is a sealing element installed between the extension of the rotating component 2 and the sealing groove 104. The first seal 105 is usually made of an elastic material, such as rubber or silicone, and can adapt to the rotational movement of the rotating component 2 while maintaining a tight sealing contact. When the rotating component 2 is installed into the rotating inner groove 100, the outer end of the rotating component 2 will enter the engagement groove 103, and its extension will contact the first seal 105 in the sealing groove 104. The first seal 105 is compressed to form a dynamic seal, which can maintain the continuity of the seal even when the rotating component 2 rotates at high speed.

[0032] Preferably, if Figure 2 and Figure 5 As shown, a connector 202 extending outward is provided at the inner end of the rotating component 2, and the hole groove 201 passes through the connector 202, and the connector 202 is connected to the cooling hole 401 of the screw rod that needs to be cooled externally.

[0033] The inner end of the rotating component 2 is designed with an outwardly extending connector 202, which serves as an interface with the cooling hole 401 at one end of the screw that needs to be cooled externally, to ensure precise docking and sealing with the screw cooling hole 401. The cooling pipe 3 extends through the central hole groove 201 of the rotating component 2, passes through the inner end of the rotating component 2, and penetrates into the cooling hole 401 of the screw through the connector 202. This design ensures that the cooling medium can directly act on the screw, effectively taking away the heat generated by friction and operation, thereby controlling the temperature of the screw and reducing the influence of thermal expansion on accuracy.

[0034] like Figure 2 ,and Figure 5 As shown, a reflux channel 206 is formed between the inner section of the hole groove 201 and the outer wall of the cooling pipe 3 , and a discharge hole 207 communicating with the reflux channel 206 is opened on the hole wall of the inner section of the hole groove 201 .

[0035] There is a certain gap between the inner section of the hole groove 201 and the outer wall of the cooling tube 3, and this gap constitutes the return channel 206. The design purpose of the return channel 206 is to form a closed cooling medium circulation path to ensure that the cooling medium can flow in the system and eventually return. When the cooling medium is injected from one end of the cooling tube 3, it contacts the external screw rod that needs to be cooled, and it will flow through the hole groove 201. Then the cooling medium will flow into the return channel 206 through the discharge hole 207 on the hole wall. In this process, the heat exchange efficiency is improved.

[0036] Preferably, a mass discharge chamber 106 is formed between the outer end of the rotating component 2 and the rotating inner groove 100 , and the mass discharge chamber 106 is provided with a mass discharge hole 107 penetrating from the outer wall of the fixed component 1 ; the outer end of the discharge hole 207 is connected to the mass discharge chamber 106 .

[0037] The mass discharge chamber 106 is located between the outer end of the rotating component 2 and the rotating inner groove 100, which is a space enclosed by the rotating component 2 and the rotating inner groove 100 of the fixed component 1. The mass discharge chamber 106 is designed to collect the cooling medium that has completed the heat exchange process and provide a buffer zone for the next step of medium discharge. The mass discharge hole 107 is an opening penetrating from the outer wall of the fixed component 1, which is directly connected to the mass discharge chamber 106. The function of the mass discharge hole 107 is to discharge the cooling medium collected in the mass discharge chamber 106 out of the rotating adapter so that the cooling medium can return to the circulation of the cooling system or be discharged into a collection container.

[0038] Furthermore, the fixing component 1 includes an end cover 10 forming an opening, a joint seat 12 having a connecting hole 101 at the outer end, and a rotating portion 11 whose inner and outer ends are connected and located between the end cover 10 and the joint seat 12. The end cover 10, the rotating portion 11 and the joint seat 12 are connected by bolts, and a rotating inner groove 100 is formed in the opening of the fixing component 1.

[0039] The end cover 10 is located at one end of the fixed component 1, forming an opening to limit the rotating component 2 and allow the connector 2 of the rotating component 2 to extend. The joint seat 12 is located at the other end of the fixed component 1, and a connecting hole 101 is provided at its outer end. This connecting hole 101 is used to connect the rotating adapter device with the external cooling medium device. The structural design of the joint seat 12 must ensure the stability and sealing of the connection. The rotating part 11 is the part of the fixed component 1 that connects the end cover 10 and the joint seat 12. It is characterized by the connection between the inner and outer ends, which means that it allows the rotating component 2 to rotate freely inside it. The design of the rotating part 11 usually includes a rotating inner groove 100, and it must also have sufficient strength to withstand the force generated during the rotation process. The end cover 10, the rotating part 11 and the joint seat 12 are connected to form a whole by bolts. This connection method is not only convenient for assembly and disassembly, but also ensures the structural stability of the fixed component 1 when it is subjected to the dynamic load generated when the rotating component 2 rotates.

[0040] Furthermore, if Figures 1 to 6 As shown, a first rotating groove 108 is provided on the inner end of the end cover 10, a locking nut 20 is threadedly connected to the outer wall of the rotating component 2, a second rotating groove 200 is provided on the outer end of the locking nut 20, the lower groove wall of the first rotating groove 108 is provided in the second rotating groove 200, and the upper groove edge of the second rotating groove 200 is provided in the first rotating groove 108.

[0041] The first rotation groove 108 is located on the inner end of the end cover 10. It is a specially designed groove whose shape matches the second rotation groove 200 on the locking nut 20 of the rotating component 2. The lower groove wall of the first rotation groove 108 is designed to be embedded in the second rotation groove 200 of the locking nut 20 to achieve mechanical engagement between the two. The locking nut 20 is threadedly connected to the outer wall of the rotating component 2 to play a limiting role. The design of the first rotation groove 108 and the second rotation groove 200 is such that when the locking nut 20 is tightened, the lower groove wall of the first rotation groove 108 will be embedded in the second rotation groove 200, and the upper groove edge of the second rotation groove 200 will also be embedded in the first rotation groove 108. This mutually interlocking structure provides radial positioning between the rotating component 2 and the end cover 10, preventing the rotating component 2 from moving in an unnecessary axial direction.

[0042] Furthermore, the joint seat 12 is located at the inner end direction of the sealing groove 104 and has a mass discharging groove 110 with a larger inner diameter. The bottom wall of the mass discharging groove 110 is connected by bolts with a limit plate 111 for limiting the movement of the first sealing member 105. The rotating component 2 extends toward the outer end through the limit plate 111 and rotationally engages the hole groove 201 in the engaging groove 103.

[0043] The joint seat 12 is located at the inner end direction of the sealing groove 104, and a mass discharge groove 110 is designed inside it. The inner diameter of the mass discharge groove 110 is larger than that of the sealing groove 104. The purpose of this design is to accommodate more cooling medium and provide a buffer space so that the cooling medium has a temporary residence and steady flow area before being discharged. On the bottom wall of the mass discharge groove 110, a limit plate 111 is connected by bolts. The function of the limit plate 111 is to limit the movement of the first seal 105 to ensure that the position of the first seal 105 between the rotating component 2 and the fixed component 1 is stable, thereby maintaining the sealing of the device at this location. The first seal 105 is located in the space between the extension of the rotating component 2 and the mass discharge groove 110. It is kept in the correct position by the limitation of the limit plate 111, ensuring that the rotating component 2 can maintain a good sealing state even in the mass discharge groove 110 when rotating to prevent leakage of the cooling medium.

[0044] Furthermore, if Figure 2 and Figure 6As shown, the rotating inner groove 100 has a built-in second seal 112, the rotating component 2 is installed in the second seal 112, the second seal 112 is located on the outer end of the rotating component 2, and the outer end of the rotating part 11, the second seal 112, the outer end of the rotating component 2, the limit plate, the sealing joint structure and the mass discharge groove 110 enclose a mass discharge chamber 106.

[0045] The second seal 112 is located at the outer end of the rotating component 2 and is installed in the rotating inner groove 100. The second seal 112 and the first seal 105 are made of elastic materials, such as rubber or silicone. It exists to enhance the sealing between the rotating component 2 and the fixed component 1, especially at the outer end of the rotating component 2, which is a high-risk area for the cooling medium to leak. The exhaust chamber 106 is a space surrounded by multiple components, including the outer end of the rotating part 11, the second seal 112, the outer end of the rotating component 2, the limit plate, the sealing joint structure and the exhaust groove 110. This design ensures that the cooling medium can be orderly gathered and discharged from the exhaust chamber 106 after completing the heat exchange.

[0046] It is worth mentioning that Figure 2 As shown, a sealing ring is provided at the connection between the end cover 10 and the rotating part 11; and also at the connection between the rotating part 11 and the joint seat 12, so as to further improve the overall sealing performance.

[0047] Furthermore, if Figure 2 and Figure 5 As shown, the distance between the discharge hole 207 and the hole groove 201 gradually increases from the position where the discharge hole 207 communicates with the reflux channel 206 to the position where the discharge hole 207 communicates with the mass discharge chamber 106 .

[0048] The distance between the discharge hole 207 and the hole groove 201 starts from the position where the discharge hole 207 communicates with the return channel 206, and gradually increases until the position where the discharge hole 207 communicates with the mass discharge chamber 106, forming an angle. The purpose of this design is to optimize the flow path of the cooling medium, and when the rotating part 2 rotates relative to the fixed part 1, it ensures that the medium can be quickly discharged along the path, avoiding unnecessary turbulence of the medium during the discharge process.

[0049] Furthermore, if Figures 2 to 5As shown, a first limit block 113 is provided on the outer end of the end cover 10, and a second limit block 114 is provided on the rotating inner groove 100. There is a spacing between the first limit block 113 and the second limit block 114. The first limit block 113, the groove wall of the rotating inner groove 100 and the second limit block 114 form a first limit groove 115; a third limit block 203 is provided on the outer end of the locking nut 20, and a fourth limit block 204 is provided on the outer wall of the rotating component 2. The spacing between the third limit block 203 and the fourth limit block 204 is the same as the spacing between the first limit block 113 and the second limit block 114. A second limit groove 205 is formed between the third limit block 203, the outer wall of the rotating component 2 and the fourth limit block 204. The outer ring of the bearing 102 is arranged in the first limit groove 115, and the inner ring of the bearing 102 is arranged in the second limit groove 205.

[0050] A first limit block 113 is provided on the end cover 10, a second limit block 114 is provided on the rotating inner groove 100, a third limit block 203 is provided on the locking nut 20, and a fourth limit block 204 is provided on the rotating component 2. These limit blocks cooperate with the inner and outer rings of the bearing 102 to form a first limit groove 115 and a second limit groove 205, thereby limiting the axial movement of the bearing 102 and ensuring its stability during rotation.

[0051] Preferably, if Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, the second limit block 114, the fourth limit block 204 and the second seal 112 located on the outer end of the rotating component 2 together enclose and form a protective cavity 116, and the protective cavity 116 is located between the bearing 102 and the mass discharge chamber 106. At least one drainage hole 109 is opened on the rotating part, and the drainage hole 109 is connected to the protective cavity 116.

[0052] In the present embodiment, the second limit block 114 and the fourth limit block 204 not only limit the axial movement of the bearing 102, but also cooperate with the second seal 112 to form a protective cavity 116. The protective cavity 116 cooperates with the drain hole 109 to play a secondary protective role. When the rotary adapter is in operation, the coolant after absorbing heat flows to the discharge hole 207 through the reflux channel 206 and then enters the mass discharge chamber 106 for discharge. In order to prevent the second seal 112 from failing due to quality problems or excessive pressure in the mass discharge chamber 106, the coolant cannot be effectively discharged from the mass discharge hole and forcibly impacts the second seal 112 to cause leakage. The leaked coolant will be in the protective cavity 116 and then discharged through the drain hole 109. It should also be added that since the rotary adapter and the bearing seat of the external transmission system are not directly matched and connected to each other, they will not affect the transmission system, reducing the risk of damage to multiple components due to sealing failure.

[0053] like Figure 2 and Figure 6 As shown, a connecting groove 208 with a larger inner diameter and connected to the hole groove 201 is provided in the extension of the rotating component 2, and a connecting portion 300 is provided at the outer end of the cooling pipe 3. The connecting portion 300 is bolted to the connecting groove 208; or the connecting portion 300 is interference fit with the connecting groove 208.

[0054] A connection groove 208 is designed in the extension of the rotating component 2, and its inner diameter is larger than that of the hole groove 201, and matches the connection portion 300 of the cooling pipe 3. The connection portion 300 of the cooling pipe 3 and the connection groove 208 can be connected by bolts to provide a detachable connection mode, which is convenient for maintenance and replacement; or an interference fit can be used to provide a more secure connection, which is suitable for occasions where frequent disassembly and assembly are not required.

[0055] Embodiment 2 See attached Figures 1 to 8 As shown: The present invention also provides a screw rod 4 equipped with the above-mentioned rotation adapter, which includes a nut 400 threadedly connected to the screw rod 4, and a driving member used to drive the screw rod 4 to rotate and connected to the inner end of the screw rod 4, a cooling hole 401 is opened on the center line of the screw rod 4, the inner end of the rotating component 2 is connected to the cooling hole 401, and the cooling pipe 3 passes through the inner end of the rotating component 2 and extends into the cooling hole 401.

[0056] The screw rod 4 and the nut 400 are core components in the precision mechanical transmission system. The screw rod 4 is connected to the nut 400 through a thread. The nut 400 can achieve linear motion when moving on the screw rod 4. In this embodiment, the driving member is set as a motor. The motor is connected to the inner end of the screw rod 4 through a coupling to drive the screw rod 4 to rotate. The torque of the motor is transmitted to the nut 400 through the screw rod 4, thereby achieving linear motion of the nut 400. In this embodiment, the cooling medium preferably uses coolant. A cooling hole 401 is opened on the center line of the screw rod 4. This cooling hole 401 runs through the length of the screw rod 4, providing a path for the coolant to directly act on the screw rod 4. The inner end of the rotating part 2 is designed with a connector 202 connected to the cooling hole 401. The cooling pipe 3 passes through the inner end of the rotating part 2 and extends into the cooling hole 401 of the screw rod 4. This design allows the coolant to flow directly into the cooling hole 401 of the screw rod 4 through the cooling pipe 3, thereby achieving direct cooling of the screw rod 4, and can effectively take away the heat generated by the screw rod 4 during operation.

[0057] In addition, Figure 8 As shown, a sealing ring can be sleeved on the connecting head 202 to improve the sealing performance of the connection between the screw rod 4 and the connecting head 202 to prevent the coolant from escaping. At least one support buckle can be sleeved on the cooling tube 3, and a plurality of through holes are opened on the support opening along the axial direction of the screw rod to facilitate the circulation of the coolant. The function of the support buckle is to help support the cooling tube so as to better carry out subsequent heat dissipation treatment of the screw rod.

[0058] Working principle: First, connect the connection hole 101 on the connector seat 12 with the external coolant device, and then connect the connector with the screw 4. The cooling pipe 3 passes through the inner end of the rotating component 2 and extends into the cooling hole 401 of the screw 4. When the motor drives the screw 4 to rotate, the external coolant device is turned on, and the nut 400 moves on the screw 4 to achieve the predetermined mechanical action. At the same time, the coolant flows from the cooling pipe 3 of the rotating adapter through the cooling hole 401 of the screw 4, taking away the heat generated by friction and motor drive, etc. The coolant after absorbing the heat flows through the reflux channel 206 to the discharge hole 207 and then enters the mass discharge chamber 106 for discharge, effectively preventing the thermal expansion caused by the increase in the temperature of the screw 4, thereby maintaining the linear motion of the nut driven by the screw and improving the transmission accuracy.

[0059] Certain words are used in the specification and claims of the present invention to refer to specific products. It should be understood by those skilled in the art that manufacturers may refer to the same component by different names. It is not intended to distinguish between components that have the same function but different names. In the following specification and patent scope, the words "comprise", "have" and "include" are open-ended words and should be interpreted as "including but not limited to...".

[0060] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A rotary switching device, characterized in that: include: A rotating component, with a hole slot penetrating inside and outside at the center thereof; A fixed component, the inner end of which is open and provided with a rotating inner groove, the outer end of which is provided with a connecting hole and connected to the rotating inner groove, the rotating inner groove has a bearing built therein, the rotating component is inserted from the open end and installed on the bearing and rotates in the rotating inner groove, and the outer end of the hole groove is connected to the connecting hole; A cooling pipe is connected in the hole groove and passes through the inner end of the rotating component.

2. A rotary switching device according to claim 1, characterized in that: A sealing joint structure is provided between the connecting hole and the rotating inner groove, and the rotating component is connected to the sealing joint structure and sealed with the connecting hole.

3. A rotary switching device according to claim 2, characterized in that: The sealing joint structure includes a joint groove located at the inner end direction of the connecting hole, and a sealing groove located at the inner end direction of the joint groove and having a larger inner diameter. The rotating component extends toward the outer end and rotationally engages the hole groove in the joint groove. A first sealing member is installed between the extended part of the rotating component and the sealing groove.

4. A rotary switching device according to claim 1, characterized in that: The inner end of the rotating component is provided with a connecting head extending outward, and the hole groove passes through the connecting head.

5. A rotary switching device according to claim 1 or 4, characterized in that: A reflux channel is formed between the inner section of the hole groove and the outer wall of the cooling pipe, and a discharge hole communicating with the reflux channel is opened on the hole wall of the inner section of the hole groove.

6. A rotary switching device according to claim 5, characterized in that: A mass discharge chamber is formed between the outer end of the rotating component and the rotating inner groove, and the mass discharge chamber is provided with a mass discharge hole penetrating from the outer wall of the fixed component; the outer end of the discharge hole is connected to the mass discharge chamber.

7. A rotary switching device according to claim 6, characterized in that: The fixing component includes an end cover forming an opening, a joint seat having the connecting hole at the outer end, and a rotating part whose inner and outer ends are connected and located between the end cover and the joint seat. The end cover, the rotating part and the joint seat are connected by bolts, and the rotating inner groove is formed in the opening of the fixing component.

8. A rotary switching device according to claim 7, characterized in that: A first rotation groove is arranged on the inner end of the end cover, a locking nut is threadedly connected on the outer wall of the rotating component, a second rotation groove is arranged on the outer end of the locking nut, the lower groove wall of the first rotation groove is arranged in the second rotation groove, and the upper groove edge of the second rotation groove is arranged in the first rotation groove.

9. A rotary switching device according to claim 8, characterized in that: The joint seat is located at the inner end of the sealing groove and has a mass discharging groove with a larger inner diameter. A limit plate for limiting the movement of the first sealing member is connected to the bottom wall of the mass discharging groove by bolts. The rotating component extends to the outer end through the limit plate and rotatably engages the hole groove in the engaging groove.

10. A rotary switching device according to claim 9, characterized in that: The rotating inner groove has a second seal built in it, the rotating component is installed in the second seal, the second seal is located on the outer end of the rotating component, and the outer end of the rotating part, the second seal, the outer end of the rotating component, the limiting plate, the sealing joint structure and the mass discharge groove enclose the mass discharge chamber.

11. A rotary switching device according to claim 6, characterized in that: The distance between the discharge hole and the hole groove gradually increases from the position where the discharge hole communicates with the reflux channel to the position where the discharge hole communicates with the mass discharge chamber.

12. A rotary switching device according to claim 10, characterized in that: A first limit block is arranged on the outer end of the end cover, and a second limit block is arranged on the rotating inner groove. There is a distance between the first limit block and the second limit block, and the first limit block, the groove wall of the rotating inner groove and the second limit block form a first limit groove; a third limit block is arranged on the outer end of the locking nut, and a fourth limit block is arranged on the outer wall of the rotating component. The distance between the third limit block and the fourth limit block is the same as the distance between the first limit block and the second limit block, and a second limit groove is formed between the third limit block, the outer wall of the rotating component and the fourth limit block, and the outer ring of the bearing is arranged in the first limit groove, and the inner ring of the bearing is arranged in the second limit groove.

13. A rotary switching device according to claim 12, characterized in that: The second limit block, the fourth limit block and the second seal located on the outer end of the rotating component together enclose and form a protective cavity, which is located between the bearing and the mass discharge chamber. At least one drainage hole is opened on the rotating part, and the drainage hole is connected to the protective cavity.

14. A rotary switching device according to claim 7, characterized in that: A connecting groove which is connected to the hole groove and has a larger inner diameter is provided in the extension of the rotating component, and a connecting portion is provided at the outer end of the cooling pipe. The connecting portion is bolted to the connecting groove; or the connecting portion is interference fit with the connecting groove.

15. A screw rod for installing a rotation switching device according to any one of claims 1 to 14, comprising a nut threadedly connected to the screw rod, and a driving member for driving the screw rod to rotate and connected to the inner end of the screw rod, characterized in that: A cooling hole is opened on the center line of the screw rod, the inner end of the rotating component is connected to the cooling hole, and a cooling pipe passes through the inner end of the rotating component and extends into the cooling hole.

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