Nut rotation driving screw transmission structure and machine tool

Abstract

The application belongs to the technical field of machine tools, and discloses a nut rotation driving lead screw transmission structure and a machine tool, wherein the nut rotation driving lead screw transmission structure comprises a lead screw, a nut threadedly connected to the lead screw, a nut seat sleeved outside the nut, and a cooling jacket sleeved outside the nut seat, a cooling channel is formed between the cooling jacket and the nut seat, the cooling jacket is provided with a liquid inlet communicated with the cooling channel and a liquid outlet communicated with the cooling channel, and then the cooling of the nut seat can be realized by conveying liquid into the cooling channel, so that the temperature of the nut seat is reduced, the temperature difference between the nut seat and the nut is increased, the nut can transmit heat to the nut seat to reduce the temperature of the nut, and thus the deformation of the nut due to the high temperature of the nut is avoided, the transmission precision of the nut rotation driving lead screw transmission structure is ensured, and the machining precision of the machine tool provided with the nut rotation driving lead screw transmission structure is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of machine tools, specifically relating to a nut rotation drive screw transmission structure and machine tool. Background Technology

[0002] Machine tools are primarily used to process workpieces made of metal or other materials, enabling them to achieve the required geometry, dimensional accuracy, and surface quality. To meet the processing demands of large workpieces, the stroke of the machine tool needs to be increased. Existing machine tools typically control this stroke by rotating a lead screw to move a nut, which increases the lead screw length. This leads to a larger support spacing, resulting in reduced axial load and rigidity, consequently lowering the lead screw's limiting speed. To maintain the lead screw's limiting speed, a larger diameter lead screw is required. However, a larger diameter leads screw inertia, which in turn increases the inertia of the machine tool's transmission system. Maintaining a suitable inertia ratio requires a higher-power drive motor, which increases the machine tool's energy consumption, thus increasing both operating and manufacturing costs.

[0003] To reduce the operating and manufacturing costs of machine tools, a new type of lead screw drive structure has emerged on the market. This structure includes a lead screw, a nut threaded onto the lead screw, and a nut seat fitted over the nut. A drive motor is connected to the nut, and the nut seat is fixedly connected to the worktable. During the drive of the worktable, the drive motor rotates the nut, causing the nut, lead screw, and nut seat to rotate relative to each other. This causes the nut to move the nut seat along the axial direction of the lead screw, and the nut seat, in turn, moves the worktable along the axial direction of the lead screw. Since the lead screw remains stationary during the drive of the worktable, there is no need to consider the reduced rigidity and impact on the maximum speed due to lead screw lengthening. Therefore, there is no need to thicken the lead screw, and thus no need to consider the increased inertia resulting from lead screw lengthening or thickening. Consequently, there is no need to equip the machine tool with a high-power motor, thereby reducing the operating and manufacturing costs of the machine tool. However, when the lead screw drive structure is working, the friction between the nut and the lead screw generates heat, and because the nut has a nut seat on its outside, the nut is prone to high temperature, which may cause thermal deformation of the nut. This affects the transmission accuracy of the lead screw drive structure, and consequently affects the machining accuracy of the machine tool. Utility Model Content

[0004] This application provides a nut rotation drive screw transmission structure to improve the transmission accuracy of the screw transmission structure and the machining accuracy of the machine tool.

[0005] The technical solution adopted in this application is as follows:

[0006] A nut rotation drive screw transmission structure includes a screw, a nut threaded to the screw, a nut seat sleeved outside the nut, and a cooling sleeve sleeved outside the nut seat. A cooling channel is formed between the cooling sleeve and the nut seat. The cooling sleeve is provided with a liquid inlet communicating with the cooling channel and a liquid outlet communicating with the cooling channel.

[0007] By adopting the above technical solution, when using the nut rotation drive screw transmission structure in this application, it is first installed on the machine tool, and the nut seat is fixedly connected to the machine tool's worktable and the machine tool's drive motor is connected to the nut transmission. Then, the outlet of the external liquid supply device is connected to the inlet through a pipeline, and the inlet of the external liquid supply device is connected to the outlet through a pipeline.

[0008] When cooling the nut, the external liquid supply device supplies liquid into the cooling channel through the inlet, allowing the liquid to flow along the cooling channel and eventually return to the external liquid supply device through the outlet. However, due to the temperature difference between the liquid and the nut seat, the liquid can exchange heat with the nut seat as it flows in the cooling channel, transferring heat from the nut seat to the liquid and thus lowering the temperature of the nut seat. This increases the temperature difference between the nut seat and the nut, allowing the nut to transfer heat to the nut seat and further lower its temperature. This avoids deformation due to high nut temperature, ensuring the transmission accuracy of the nut rotation drive screw transmission structure and the machining accuracy of the machine tool equipped with the nut rotation drive screw transmission structure of this application.

[0009] Meanwhile, since a cooling channel is formed between the cooling sleeve and the nut seat, compared with the solution of placing the cooling channel inside the nut seat, the difficulty of forming the cooling channel is reduced, thereby reducing the manufacturing difficulty of the nut seat and thus reducing the manufacturing cost of the nut seat. Furthermore, compared with placing the cooling channel inside the nut, on the one hand, the difficulty of forming the cooling channel is reduced, thereby reducing the manufacturing difficulty of the nut and thus reducing the manufacturing cost of the nut; on the other hand, it avoids the situation where the nut structural strength is affected by placing the cooling channel inside the nut, thus ensuring the service life of the nut rotation drive screw transmission structure.

[0010] Optionally, the outer peripheral surface of the nut seat is provided with a cooling groove, which together with the cooling sleeve forms the cooling channel.

[0011] By adopting the above technical solution, since the cooling tank and the cooling jacket together form a cooling channel, and the cooling tank is located on the outer circumferential surface of the nut seat, the difficulty of forming the cooling channel is reduced. At the same time, the contact area between the liquid flowing in the cooling channel and the nut seat is increased, thereby increasing the cooling effect of the liquid on the nut seat, further increasing the temperature difference between the nut seat and the nut, and further reducing the temperature of the nut, so as to further ensure the transmission accuracy of the nut rotation drive screw transmission structure.

[0012] Optionally, the cooling groove is spirally arranged circumferentially along the nut seat;

[0013] Alternatively, the cooling groove extends circumferentially along the nut seat, and multiple cooling grooves are spaced apart axially along the nut seat;

[0014] Alternatively, the cooling groove extends axially along the nut seat, and multiple cooling grooves are spaced apart circumferentially along the nut seat.

[0015] By adopting the above technical solution, since the cooling groove is spirally arranged along the circumference of the nut seat, the length of the cooling groove in the circumference of the nut seat is increased, thereby further increasing the contact area between the liquid flowing in the cooling channel and the nut seat, thus further increasing the cooling effect of the liquid on the nut seat, further increasing the temperature difference between the nut seat and the nut, and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure.

[0016] Because the cooling grooves extend circumferentially along the nut seat and are spaced multiple times along the axial direction of the nut seat, the contact area between the liquid and the nut seat is further increased, thereby further increasing the cooling effect of the liquid on the nut seat, further increasing the temperature difference between the nut seat and the nut, and further ensuring the transmission accuracy of the screw drive structure for nut rotation.

[0017] Because the cooling grooves extend axially along the nut seat and are spaced out in multiples along the circumference of the nut seat, the contact area between the liquid and the nut seat is further increased, thereby further increasing the cooling effect of the liquid on the nut seat, further increasing the temperature difference between the nut seat and the nut, and thus further ensuring the transmission accuracy of the screw drive structure for nut rotation.

[0018] Optionally, sealing rings are provided at both ends of the cooling sleeve, and the sealing rings are sleeved outside the nut seat and located between the cooling sleeve and the nut seat.

[0019] By adopting the above technical solution, since the sealing ring is sleeved on the outside of the nut seat and located between the cooling sleeve and the nut seat, it can seal the gap between the cooling sleeve and the nut seat to prevent liquid from overflowing through the gap, thus ensuring the sealing performance between the cooling sleeve and the nut seat. On the other hand, the elastic deformation of the sealing ring can increase the friction between the cooling sleeve and the nut seat, thereby increasing the connection stability between the cooling sleeve and the nut seat.

[0020] Optionally, the outer peripheral surface of the nut seat and / or the inner peripheral surface of the cooling sleeve are provided with receiving grooves, and at least a portion of the sealing ring is located in the receiving grooves.

[0021] By adopting the above technical solution, since the outer peripheral surface of the nut seat and / or the inner peripheral surface of the cooling sleeve are provided with receiving grooves, and at least part of the sealing ring is located in the receiving grooves, the sealing ring can be limited by the groove wall of the receiving groove to increase the stability of the sealing ring, thereby ensuring the sealing performance of the sealing ring on the cooling sleeve and the nut seat. On the other hand, the contact area between the sealing ring and the nut seat or the cooling sleeve can be increased to further enhance the sealing effect of the sealing ring on the cooling sleeve and the nut seat.

[0022] Optionally, the nut seat is provided with a stop wall, and the cooling sleeve has an inner end that stops and engages with the stop wall.

[0023] By adopting the above technical solution, since the nut seat is provided with a stop wall and the cooling sleeve has an inner end that stops and cooperates with the stop wall, on the one hand, when installing the cooling sleeve, the inner end of the cooling sleeve can be used to cooperate with the stop wall to achieve the positioning and limiting of the cooling sleeve, so as to facilitate the installation of the cooling sleeve in place. On the other hand, it can also increase the contact area between the cooling sleeve and the nut seat, so as to increase the sealing between the cooling sleeve and the nut seat.

[0024] Optionally, the cooling sleeve also has an outer end opposite to the inner end, and the nut seat is provided with a stop plate, which is located on the side of the outer end away from the inner end and can cooperate with the stop plate of the outer end.

[0025] By adopting the above technical solution, since the stop plate is located on the side of the outer end away from the inner end and can cooperate with the outer end stop, on the one hand, the cooperation between the stop plate and the outer end stop can limit the cooling sleeve to prevent the cooling sleeve from moving axially in the nut seat, thereby increasing the connection stability between the cooling sleeve and the nut seat. On the other hand, the stop plate can also be used to seal the gap between the outer end of the cooling sleeve and the nut seat, thereby further increasing the sealing performance between the cooling sleeve and the nut seat.

[0026] Optionally, the inner circumferential surface of the nut seat and / or the outer circumferential surface of the nut are provided with an oil receiving groove, and the nut seat is provided with an oil injection channel. The oil injection channel has an oil inlet located on the outer wall surface of the nut seat and an oil outlet located on the inner circumferential surface of the nut seat. The oil outlet is arranged opposite to the oil receiving groove.

[0027] By adopting the above technical solution, since the inner circumferential surface of the nut seat and / or the outer circumferential surface of the nut are provided with oil grooves, the oil inlet of the oil injection channel is located on the outer wall surface of the nut seat, and the oil outlet of the oil injection channel is located on the inner circumferential surface of the nut seat and is opposite to the oil groove, lubricating oil can be added to the oil injection channel through the oil inlet, so that the lubricating oil flows along the oil injection channel and finally enters the oil groove through the oil outlet. The lubricating oil entering the oil groove is used to lubricate the nut and nut seat, thereby reducing the friction when the nut and nut seat rotate relative to each other. This reduces the heat generation of the nut, thereby lowering the temperature of the nut and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure. On the other hand, it also reduces the load on the drive motor, thereby reducing the energy consumption of the machine tool equipped with the nut rotation drive screw transmission structure of this application, thus reducing the operating cost of the machine tool. Furthermore, it also reduces the friction between the nut and nut seat, thereby ensuring the service life of the nut rotation drive screw transmission structure.

[0028] Optionally, the inner circumferential surface of the nut seat is provided with a boss surrounding the nut, and both ends of the boss are provided with a sealing element sleeved on the outside of the nut. The sealing element is located inside the nut seat, and the oil groove is located between the two sealing elements.

[0029] By adopting the above technical solution, since both ends of the boss are equipped with sealing elements sleeved on the outside of the nut, and the oil groove is located between the two sealing elements, the gap between the boss and the nut can be sealed by the sealing elements, so as to form a sealed lubrication cavity between the boss and the nut. This ensures the lubrication effect of the lubricating oil on the nut, and at the same time, it can prevent the lubricating oil from leaking, so as to ensure the cleanliness of the screw drive structure for rotating the nut and improve the user experience.

[0030] This application also provides a machine tool to improve the machining accuracy of the machine tool.

[0031] A machine tool includes a nut rotation drive screw transmission structure as described above.

[0032] By adopting the above technical solution, since the machine tool in this application uses the above-mentioned nut rotation drive screw transmission structure, it is possible to use liquid to cool the nut seat, thereby increasing the temperature difference between the nut seat and the nut. This allows the nut to quickly transfer heat to the nut seat, thereby reducing the temperature of the nut. This prevents the nut from deforming due to high temperature, which could affect the transmission accuracy of the nut rotation drive screw transmission structure, and thus ensures the machining accuracy of the machine tool.

[0033] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0034] 1. The nut rotation drive screw transmission structure of this application includes a screw, a nut threaded to the screw, a nut seat sleeved on the outside of the nut, and a cooling sleeve sleeved on the outside of the nut seat. A cooling channel is formed between the cooling sleeve and the nut seat. The cooling sleeve is provided with a liquid inlet communicating with the cooling channel and a liquid outlet communicating with the cooling channel. The nut seat can be cooled by supplying liquid to the cooling channel, thereby reducing the temperature of the nut seat and increasing the temperature difference between the nut seat and the nut. This allows the nut to transfer heat to the nut seat, thereby reducing the temperature of the nut. This avoids deformation due to high nut temperature, ensuring the transmission accuracy of the nut rotation drive screw transmission structure and the machining accuracy of the machine tool equipped with the nut rotation drive screw transmission structure of this application.

[0035] 2. The outer circumferential surface of the nut seat in this application is provided with a cooling groove. The cooling groove and the cooling sleeve together form a cooling channel, which reduces the difficulty of forming the cooling channel and increases the contact area between the liquid flowing in the cooling channel and the nut seat, thereby increasing the cooling effect of the liquid on the nut seat, further increasing the temperature difference between the nut seat and the nut, and further reducing the temperature of the nut, so as to further ensure the transmission accuracy of the nut rotation drive screw transmission structure.

[0036] 3. In this application, both ends of the cooling jacket are provided with sealing rings. The sealing rings are sleeved on the outside of the nut seat and located between the cooling jacket and the nut seat. On the one hand, the sealing rings can seal the gap between the cooling jacket and the nut seat to prevent liquid from overflowing through the gap between the cooling jacket and the nut seat, thereby ensuring the sealing performance between the cooling jacket and the nut seat. On the other hand, the elastic deformation of the sealing rings can increase the friction between the cooling jacket and the nut seat, thereby increasing the connection stability between the cooling jacket and the nut seat. Attached Figure Description

[0037] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 A cross-sectional view of the nut rotation drive screw transmission structure described in one embodiment of this application;

[0039] Figure 2 for Figure 1 Enlarged view of part A in the middle;

[0040] Figure 3 This is a cross-sectional view of the nut rotation drive screw transmission structure described in another embodiment of this application;

[0041] Figure 4 This is a cross-sectional view of a portion of the machine tool structure described in one embodiment of this application.

[0042] Figure label:

[0043] 1. Lead screw; 2. Nut; 21. Oil groove; 22. Seal; 23. Thrust ball bearing; 24. Deep groove ball bearing; 25. Flange; 26. Locking nut; 27. First retaining ring; 28. Second retaining ring; 3. Nut seat; 31. Receiving groove; 32. Stop wall; 33. Stop plate; 34. Oil injection channel; 35. Boss; 4. Cooling jacket; 41. Cooling channel; 42. Annular rib; 43. Sealing ring; 5. Driven synchronous pulley; 6. Worktable; 61. Through hole; 62. Drive motor; 621. Driven synchronous pulley; 622. Synchronous belt. Detailed Implementation

[0044] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0046] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0049] Reference Figures 1 to 3 A screw drive structure for nut rotation is disclosed, which includes a screw 1, a nut 2 threaded to the screw 1, a nut seat 3 sleeved outside the nut 2, and a cooling sleeve 4 sleeved outside the nut seat 3. A cooling channel 41 is formed between the cooling sleeve 4 and the nut seat 3. The cooling sleeve 4 is provided with an inlet and an outlet communicating with the cooling channel 41.

[0050] It is understandable that the nut 2 is sleeved on the outside of the lead screw 1 and threaded to the lead screw 1, and the nut seat 3 has a central hole, through which the nut 2 passes.

[0051] When using the nut rotation drive screw transmission structure in this application, first install it on the machine tool, then fix the nut seat 3 to the machine tool's worktable 6 and drive the machine tool's drive motor 62 to the nut 2. Then connect the outlet of the external liquid supply device to the inlet through a pipeline and connect the inlet of the external liquid supply device to the outlet through a pipeline.

[0052] When cooling nut 2, the external liquid supply device supplies liquid into the cooling channel 41 through the liquid inlet, so that the liquid flows along the cooling channel 41 and eventually returns to the external liquid supply device through the liquid outlet. However, due to the temperature difference between the liquid and the nut seat 3, the liquid can exchange heat with the nut seat 3 when flowing in the cooling channel 41, so that the heat of the nut seat 3 is transferred to the liquid, thereby reducing the temperature of the nut seat 3 and increasing the temperature difference between the nut seat 3 and nut 2. This allows nut 2 to transfer heat to the nut seat 3, thereby reducing the temperature of nut 2. Therefore, deformation due to high temperature of nut 2 is avoided, thus ensuring the transmission accuracy of the nut rotation drive screw transmission structure and ensuring the machining accuracy of the machine tool equipped with the nut rotation drive screw transmission structure of this application.

[0053] Meanwhile, since a cooling channel 41 is formed between the cooling sleeve 4 and the nut seat 3, compared with the scheme of setting the cooling channel 41 inside the nut seat 3, the difficulty of forming the cooling channel 41 is reduced, thereby reducing the manufacturing difficulty of the nut seat 3 and thus reducing the manufacturing cost of the nut seat 3. Furthermore, compared with setting the cooling channel 41 inside the nut 2, on the one hand, the difficulty of forming the cooling channel 41 is reduced, thereby reducing the manufacturing difficulty of the nut 2 and thus reducing the manufacturing cost of the nut 2. On the other hand, it avoids the situation where the structural strength of the nut 2 is affected by the cooling channel 41 being set inside the nut 2, thereby ensuring the service life of the nut rotation drive screw transmission structure.

[0054] This application does not specifically limit the formation of the cooling channel 41, which can be any of the following embodiments:

[0055] Implementation Method 1, in this implementation method, refer to Figure 1 and Figure 2 The outer circumferential surface of the nut seat 3 is provided with a cooling groove, which together with the cooling sleeve 4 forms a cooling channel 41. This reduces the difficulty of forming the cooling channel 41 and increases the contact area between the liquid flowing in the cooling channel 41 and the nut seat 3, thereby increasing the cooling effect of the liquid on the nut seat 3. This further increases the temperature difference between the nut seat 3 and the nut 2, thereby further reducing the temperature of the nut 2 and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure.

[0056] This application does not impose specific limitations on the structure of the cooling tank, which can adopt any of the following embodiments:

[0057] Example 1, in this example, refers to Figure 1The cooling groove is spirally arranged around the nut seat 3, thereby increasing the length of the cooling groove around the nut seat 3. This further increases the contact area between the liquid flowing in the cooling channel 41 and the nut seat 3, thereby further increasing the cooling effect of the liquid on the nut seat 3. This further increases the temperature difference between the nut seat 3 and the nut 2, and further ensures the transmission accuracy of the nut rotation drive screw transmission structure.

[0058] Preferably, the liquid inlet is located at one end of the cooling tank and the liquid outlet is located at the other end of the cooling tank, so as to ensure the flow path of the liquid in the cooling channel 41, thereby ensuring the cooling effect of the liquid on the nut seat 3.

[0059] Example 2: In this example, the cooling groove extends circumferentially along the nut seat 3, and multiple cooling grooves are spaced apart axially along the nut seat 3.

[0060] It is understandable that the cooling groove is an annular groove extending circumferentially along the nut seat 3.

[0061] Since the cooling groove extends circumferentially along the nut seat 3 and multiple cooling grooves are spaced apart axially along the nut seat 3, the contact area between the liquid and the nut seat 3 is further increased, thereby further increasing the cooling effect of the liquid on the nut seat 3, further increasing the temperature difference between the nut seat 3 and the nut 2, and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure.

[0062] In this embodiment, the number of inlets and outlets is not specifically limited. Preferably, the outer circumferential surface of the nut seat 3 is provided with a connecting groove connecting two adjacent cooling tanks. There is one inlet and one outlet, located at opposite ends of the cooling jacket 4. Both inlets and outlets are connected to two cooling tanks located at their ends, ensuring the flow path of the liquid in the cooling channel 41 and thus guaranteeing the cooling effect on the nut seat 3. This also reduces the number of pipes required when connecting an external liquid supply device to the cooling channel 41. In other embodiments, multiple inlets and outlets can be provided for each cooling tank, eliminating the connecting groove. The cooling jacket 4 has one inlet and one outlet for each cooling tank.

[0063] In Example 3, the cooling groove extends axially along the nut seat 3 and is provided in multiple circumferentially spaced manner, thereby further increasing the contact area between the liquid and the nut seat 3, thus further increasing the cooling effect of the liquid on the nut seat 3, further increasing the temperature difference between the nut seat 3 and the nut 2, and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure.

[0064] In this embodiment, the number of inlets and outlets is not specifically limited. Preferably, the outer circumferential surface of the nut seat 3 is provided with a connecting groove connecting two adjacent cooling tanks, and the two adjacent connecting grooves are respectively located at the two ends of the cooling tank between them. One inlet and one outlet are each provided, located on opposite sides of the cooling sleeve 4, and each inlet and outlet is connected to its corresponding cooling tank to ensure the flow path of the liquid in the cooling channel 41, thereby ensuring the cooling effect of the liquid on the nut seat 3. This also reduces the number of pipes required when connecting the external liquid supply device to the cooling channel 41. In other embodiments, multiple inlets and outlets can be provided corresponding to multiple cooling tanks, i.e., the connecting groove is eliminated, and the cooling sleeve 4 has one inlet and one outlet for each cooling tank.

[0065] Implementation Method Two: In this implementation method, refer to... Figure 3 The cooling jacket 4 has two annular ribs 42 inside, which are located at both ends of the cooling jacket 4. The cooling jacket 4 and the nut seat 3 form a cooling channel 41 together under the sealing effect of the two annular ribs 42, thereby increasing the volume of the cooling channel 41 and thus increasing the volume of liquid that can be contained in the cooling channel 41. This improves the cooling effect on the nut seat 3, further increases the temperature difference between the nut seat 3 and the nut 2, further improves the cooling effect on the nut 2, and further ensures the transmission accuracy of the nut rotation drive screw transmission structure.

[0066] In this embodiment, the relative positional relationship between the liquid inlet and the liquid outlet is not specifically limited. Preferably, the liquid inlet and the liquid outlet are located at opposite ends of the cooling jacket 4, and on opposite sides of the cooling jacket 4, to increase the flow path of the liquid in the cooling channel 41, thereby further increasing the cooling effect of the liquid on the nut seat 3, further increasing the temperature difference between the nut seat 3 and the nut 2, and further reducing the temperature of the nut 2, so as to further ensure the transmission accuracy of the nut rotation drive screw transmission structure. In other embodiments, the liquid inlet and the liquid outlet may also be located on the same side of the cooling jacket 4.

[0067] To further increase the flow path of the liquid in the cooling channel 41, spiral blades can be provided on the inner circumferential surface of the cooling jacket 4 so that a spiral cooling channel 41 is formed between the cooling jacket 4 and the nut seat 3, thereby further increasing the flow path of the liquid in the cooling channel 41.

[0068] This application does not specify the sealing method between the cooling jacket 4 and the nut seat 3. Preferably, refer to Figure 2 Both ends of the cooling sleeve 4 are provided with sealing rings 43, which are sleeved on the outside of the nut seat 3 and located between the cooling sleeve 4 and the nut seat 3.

[0069] It is understandable that there are two sealing rings 43, which are located at both ends of the cooling sleeve 4 and are both located inside the cooling sleeve 4. The inner circumferential surface of the sealing ring 43 contacts the outer circumferential surface of the nut seat 3, and the outer circumferential surface of the sealing ring 43 contacts the inner circumferential surface of the cooling sleeve 4.

[0070] Since the sealing ring 43 is sleeved on the outside of the nut seat 3 and located between the cooling sleeve 4 and the nut seat 3, it can seal the gap between the cooling sleeve 4 and the nut seat 3 to prevent liquid from overflowing through the gap, thus ensuring the sealing performance between the cooling sleeve 4 and the nut seat 3. On the other hand, the elastic deformation of the sealing ring 43 can increase the friction between the cooling sleeve 4 and the nut seat 3, thereby increasing the connection stability between the cooling sleeve 4 and the nut seat 3.

[0071] Preferably, after the nut rotation drive screw transmission structure is assembled, the sealing ring 43 is in an elastic deformation state under the mutual compression of the nut seat 3 and the cooling sleeve 4, so as to increase the contact area between the sealing ring 43 and the outer peripheral surface of the nut seat 3 and the inner peripheral surface of the cooling sleeve 4, thereby ensuring the sealing effect of the sealing ring 43 on the nut seat 3 and the cooling sleeve 4.

[0072] Furthermore, refer to Figure 2 The outer circumferential surface of the nut seat 3 and / or the inner circumferential surface of the cooling sleeve 4 are provided with a receiving groove 31, and at least a portion of the sealing ring 43 is located in the receiving groove 31.

[0073] It is understood that the outer circumferential surface of the nut seat 3 is provided with a receiving groove 31, which is an annular groove extending along the circumference of the nut seat 3; or the inner circumferential surface of the cooling sleeve 4 is provided with a receiving groove 31, which is an annular groove extending along the circumference of the cooling sleeve 4; or both the outer circumferential surface of the nut seat 3 and the inner circumferential surface of the cooling sleeve 4 are provided with receiving grooves 31, the receiving groove 31 of the nut seat 3 is an annular groove extending along the circumference of the nut seat 3, and the receiving groove 31 of the cooling sleeve 4 is an annular groove extending along the circumference of the cooling sleeve 4.

[0074] Since either the outer circumferential surface of the nut seat 3 or the inner circumferential surface of the cooling sleeve 4 is provided with a receiving groove 31, and at least part of the sealing ring 43 is located in the receiving groove 31, the groove wall of the receiving groove 31 can be used to limit the sealing ring 43 to increase the stability of the sealing ring 43, thereby ensuring the sealing performance of the sealing ring 43 on the cooling sleeve 4 and the nut seat 3. On the other hand, it can also increase the contact area between the sealing ring 43 and the nut seat 3 or the cooling sleeve 4 to further increase the sealing effect of the sealing ring 43 on the cooling sleeve 4 and the nut seat 3.

[0075] The better one is to refer to Figure 2 Only the outer circumferential surface of the nut seat 3 is provided with a receiving groove 31, so that before installing the cooling sleeve 4, the sealing ring 43 can be first placed in the receiving groove 31, and then the cooling sleeve 4 can be installed. During the installation of the cooling sleeve 4, the groove wall of the receiving groove 31 can be used to limit the sealing ring 43 to avoid the sealing ring 43 from shifting, thereby facilitating the installation of the cooling sleeve 4 and ensuring the stability of the sealing ring 43.

[0076] In other embodiments, the cooling sleeve 4 can be fixedly connected to the nut seat 3 by welding, so that the gap between the cooling sleeve 4 and the nut seat 3 can be sealed by welding, thereby not only achieving the sealing between the cooling sleeve 4 and the nut seat 3, but also achieving the fixed connection between the cooling sleeve 4 and the nut seat 3.

[0077] This application does not specify the method of fixing the cooling jacket 4; preferably, refer to... Figure 2 The nut seat 3 is provided with a stop wall 32, and the cooling sleeve 4 has an inner end that stops and cooperates with the stop wall 32. Thus, when installing the cooling sleeve 4, the inner end of the cooling sleeve 4 can cooperate with the stop wall 32 to achieve the positioning and limiting of the cooling sleeve 4, so as to facilitate the installation of the cooling sleeve 4 into place. On the other hand, it can also increase the contact area between the cooling sleeve 4 and the nut seat 3, so as to increase the sealing between the cooling sleeve 4 and the nut seat 3.

[0078] This application does not specifically limit the formation method of the stop wall 32; preferably, refer to Figure 2 The nut seat 3 has an annular notch on its outer surface. The cooling sleeve 4 is fitted onto the annular notch, and the end wall of the annular notch forms a stop wall 32. This notch not only allows the stop wall 32 to be formed on the nut seat 3, but also ensures that the outer circumferential surface of the cooling sleeve 4 is flush with the outer circumferential surface of the nut seat 3. In other embodiments, the outer circumferential surface of the nut seat 3 is provided with an annular rib, and the annular rib forms a stop wall 32 near the end wall of the cooling sleeve 4.

[0079] Furthermore, refer to Figure 1 and Figure 3 The cooling sleeve 4 also has an outer end opposite to the inner end. The nut seat 3 is provided with a stop plate 33. The stop plate 33 is located on the side of the outer end away from the inner end and can cooperate with the outer end stop. On the one hand, the stop plate 33 can be used to limit the cooling sleeve 4 by cooperating with the outer end stop, so as to prevent the cooling sleeve 4 from moving in the axial direction of the nut seat 3, thereby increasing the connection stability between the cooling sleeve 4 and the nut seat 3. On the other hand, the stop plate 33 can also be used to seal the gap between the outer end of the cooling sleeve 4 and the nut seat 3, so as to further increase the sealing between the cooling sleeve 4 and the nut seat 3.

[0080] Preferably, the stop plate 33 can apply a compressive force to the cooling sleeve 4 in the direction of the stop wall 32 to fix the cooling sleeve 4, thereby increasing the connection stability between the cooling sleeve 4 and the nut seat 3.

[0081] This application does not specifically limit the structure of the stop piece 33; preferably, refer to... Figure 1 and Figure 3 The stop plate 33 is an annular plate structure with holes for the nut 2 to pass through, increasing the contact area between the stop plate 33 and the cooling sleeve 4. This further enhances the stability of the cooling sleeve 4 and the sealing effect of the stop plate 33 on the gap between the cooling sleeve 4 and the nut seat 3, thereby further improving the sealing performance between the cooling sleeve 4 and the nut seat 3. In other embodiments, the stop plate 33 can also be a ribbed structure, with multiple stop plates 33 spaced apart circumferentially along the nut seat 3.

[0082] This application does not specifically limit the connection method between the stop plate 33 and the nut seat 3. Preferably, the stop plate 33 is fixedly connected to the nut seat 3 by screws, which increases the connection stability between the stop plate 33 and the nut seat 3 and also facilitates the assembly and disassembly of the stop plate 33. In other embodiments, the stop plate 33 can also be fixedly connected to the nut seat 3 by welding.

[0083] In other embodiments, the cooling sleeve 4 can also be fixedly connected to the nut seat 3 by welding; or, the cooling sleeve 4 can be fixedly connected to the nut seat 3 by screws.

[0084] In a preferred embodiment, refer to Figure 1 and Figure 3 The inner circumferential surface of the nut seat 3 and / or the outer circumferential surface of the nut 2 are provided with an oil receiving groove 21. The nut seat 3 is provided with an oil injection channel 34. The oil injection channel 34 has an oil inlet located on the outer wall of the nut seat 3 and an oil outlet located on the inner circumferential surface of the nut seat 3. The oil outlet is arranged opposite to the oil receiving groove 21.

[0085] It is understood that the inner circumferential surface of the nut seat 3 is provided with an oil-receiving groove 21, and the oil-receiving groove 21 is an annular groove extending along the circumference of the nut seat 3; or the outer circumferential surface of the nut 2 is provided with an oil-receiving groove 21, and the oil-receiving groove 21 is an annular groove extending along the circumference of the nut 2; or both the inner circumferential surface of the nut seat 3 and the outer circumferential surface of the nut 2 are provided with oil-receiving grooves 21, and the oil-receiving groove 21 on the inner circumferential surface of the nut seat 3 is opposite to the oil-receiving groove 21 on the outer circumferential surface of the nut 2, the oil-receiving groove 21 on the nut seat 3 is an annular groove extending along the circumference of the nut seat 3, and the oil-receiving groove 21 on the outer circumferential surface of the nut 2 is an annular groove extending along the circumferential direction of the nut 2.

[0086] Because the inner circumferential surface of the nut seat 3 and / or the outer circumferential surface of the nut 2 are provided with an oil groove 21, the oil inlet of the oil injection channel 34 is located on the outer wall surface of the nut seat 3, and the oil outlet of the oil injection channel 34 is located on the inner circumferential surface of the nut seat 3 and is opposite to the oil groove 21, lubricating oil can be added to the oil injection channel 34 through the oil inlet, so that the lubricating oil flows along the oil injection channel 34 and finally enters the oil groove 21 through the oil outlet, so as to use the lubricating oil entering the oil groove 21 to lubricate the nut 2 and the nut seat 3, thereby reducing the friction when the nut 2 and the nut seat 3 rotate relative to each other. This reduces the heat generation of the nut 2, thereby lowering the temperature of the nut 2 and further ensuring the transmission accuracy of the nut rotation drive screw transmission structure. On the other hand, it also reduces the load on the drive motor 62, thereby reducing the energy consumption of the machine tool equipped with the nut rotation drive screw transmission structure of this application, thereby reducing the operating cost of the machine tool. Furthermore, it also reduces the friction between the nut 2 and the nut seat 3, thereby ensuring the service life of the nut rotation drive screw transmission structure.

[0087] The better one is to refer to Figure 1 and Figure 3 Both the inner circumferential surface of the nut seat 3 and the outer circumferential surface of the nut 2 are provided with oil grooves 21, and the oil grooves 21 provided on the inner circumferential surface of the nut seat 3 and the oil grooves 21 provided on the outer circumferential surface of the nut 2 are arranged opposite to each other to increase the space between the nut seat 3 and the nut 2 for storing lubricating oil.

[0088] The better one is to refer to Figure 1 The oil injection channel 34 is located above the nut 2 to prevent the lubricating oil between the nut seat 3 and the nut 2 from being discharged through the oil injection channel 34 under the action of gravity, so as to ensure the lubricating effect of the lubricating oil on the nut seat 3 and the nut 2.

[0089] This application does not specify the location of the oil inlet, which can be any of the following embodiments:

[0090] Example 1, in this example, refers to Figure 1 The oil inlet is located at the end of the nut seat 3 away from the stop plate 33 and at the top of the nut seat 3, so as to facilitate the addition of lubricating oil between the nut seat 3 and the nut 2 through the oil injection channel 34.

[0091] Example 2: In this example, the oil inlet is located at one end of the nut seat 3 near the stop plate 33 and at the end of the nut seat 3, so that the stop plate 33 can be used to block the oil inlet, thereby increasing the sealing of the oil injection channel 34.

[0092] Furthermore, refer to Figure 1 and Figure 3The inner circumferential surface of the nut seat 3 is provided with a boss 35 surrounding the nut 2. Both ends of the boss 35 are provided with a sealing element 22 sleeved on the outside of the nut 2. The sealing element 22 is located inside the nut seat 3, and the oil groove 21 is located between the two sealing elements 22.

[0093] It is understandable that there are two seals 22, and the two seals 22 are located at the two ends of the boss 35 respectively; the oil groove 21 located on the inner circumferential surface of the nut seat 3 is provided on the boss 35.

[0094] Since both ends of the boss 35 are provided with sealing elements 22 sleeved on the outside of the nut 2, and the oil groove 21 is located between the two sealing elements 22, the gap between the boss 35 and the nut 2 can be sealed by the sealing elements 22, so that a sealed lubrication cavity is formed between the boss 35 and the nut 2, thereby ensuring the lubrication effect of the lubricating oil on the nut 2, and at the same time preventing the occurrence of lubricating oil leakage, so as to ensure the cleanliness of the screw drive structure for the nut rotation drive, and improve the user experience.

[0095] This application does not specifically limit the material of the seal 22. Preferably, the seal 22 is a ring structure made of silicone rubber to ensure a sealing effect on the nut seat 3 and the nut 2. In other embodiments, the seal 22 may also be a ring structure made of fluororubber.

[0096] Furthermore, refer to Figure 1 and Figure 3 The nut seat 3 is equipped with a thrust ball bearing 23 and a deep groove ball bearing 24 that are sleeved on the outside of the nut 2 to reduce the friction between the nut 2 and the nut seat 3.

[0097] Specifically, there are two thrust ball bearings 23 and two deep groove ball bearings 24. The two thrust ball bearings 23 are located between the two deep groove ball bearings 24, and one thrust ball bearing 23 and one deep groove ball bearing 24 are located at one end of the boss 35, while the other thrust ball bearing 23 and the other deep groove ball bearing 24 are located at the other end of the boss 35.

[0098] Furthermore, refer to Figure 1 and Figure 3One end of the nut 2 is fixedly connected to a flange 25, and the other end of the nut 2 is threadedly connected to a locking nut 26. The flange 25 and the locking nut 26 are located at both ends of the nut seat 3, so as to achieve relative fixation of the nut 2 and the nut seat 3 by limiting the locking nut 26 and the flange 25. The two deep groove ball bearings 24 are provided with a first retaining ring 27 sleeved on the outside of the nut 2 at their opposite ends. The opposite ends of the two first retaining rings 27 contact the flange 25 and the locking nut 26 respectively, and the close ends of the two first retaining rings 27 contact the inner ring of the deep groove ball bearing 24 respectively. The two ends of the boss 35 are provided with a second retaining ring 28 sleeved on the outside of the nut 2. The two second retaining rings 28 are located between the deep groove ball bearing 24 and the thrust ball bearing 23. The opposite ends of the two second retaining rings 28 contact the inner ring of the deep groove ball bearing 24, and the close ends of the two second retaining rings 28 contact the end face of the thrust ball bearing 23 away from the boss 35.

[0099] Furthermore, refer to Figure 1 and Figure 3 The nut rotation drive screw transmission structure also includes a driven synchronous pulley 5. The screw 1 is installed through the driven synchronous pulley 5, and the driven synchronous pulley 5 is coaxially fixedly connected to the flange 25 so that the nut 2 and the drive motor 62 can be connected by the synchronous belt 622.

[0100] Preferably, the nut 2 is provided with balls that contact the outer circumference of the lead screw 1, so that the nut 2 and the lead screw 1 together constitute a ball screw, thereby reducing the power required to drive the nut 2 to rotate relative to the lead screw 1.

[0101] Reference Figure 4 This application also discloses a machine tool that includes the nut rotation drive screw transmission structure as described above.

[0102] Because the machine tool in this application adopts the aforementioned nut rotation drive screw transmission structure, it is possible to use liquid to cool the nut seat 3, thereby increasing the temperature difference between the nut seat 3 and the nut 2. This allows the nut 2 to quickly transfer heat to the nut seat 3, achieving the effect of reducing the temperature of the nut 2. This prevents the nut 2 from deforming due to high temperature, which could affect the transmission accuracy of the nut rotation drive screw transmission structure, and thus ensures the machining accuracy of the machine tool.

[0103] In a preferred embodiment, refer to Figure 4The machine tool has a bed and a worktable 6 slidably connected to the bed. The worktable 6 is provided with a through hole 61. A part of the nut seat 3 extends into the through hole 61 and is fixedly connected to the worktable 6. The worktable 6 is provided with a drive motor 62. The output shaft of the drive motor 62 is parallel to and spaced apart from the lead screw 1. A driving synchronous pulley 621 is coaxially fixedly connected to the output shaft of the drive motor 62. The driven synchronous pulley 5 and the driving synchronous pulley 621 are on the same plane and are connected by a synchronous belt 622. The lead screw 1 passes through the through hole 61, and the bed is provided with bearing seats at both ends of the lead screw 1. The bearing seats are used to support and position the lead screw 1.

[0104] When the drive table 6 moves, the output shaft of the drive motor 62 drives the nut 2 to rotate under the action of the active synchronous pulley 621, the driven synchronous pulley 5 and the synchronous belt 622, so that the nut 2 rotates relative to the lead screw 1 and the nut seat 3, thereby causing the nut 2 to drive the nut seat 3 to move along the axial direction of the lead screw 1, and the nut seat 3 drives the worktable 6 to move.

[0105] Preferably, the worktable 6 is provided with perforated structures corresponding to the liquid inlet and liquid outlet, so that the pipeline can extend into the perforated structures and communicate with the liquid inlet and liquid outlet.

[0106] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0107] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0108] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A nut rotation driving screw transmission structure, characterized in that, It includes a lead screw (1), a nut (2) threaded to the lead screw (1), a nut seat (3) sleeved on the outside of the nut (2), and a cooling sleeve (4) sleeved on the outside of the nut seat (3). A cooling channel (41) is formed between the cooling sleeve (4) and the nut seat (3). The cooling sleeve (4) is provided with an inlet communicating with the cooling channel (41) and an outlet communicating with the cooling channel (41).

2. The nut rotation drive screw transmission structure according to claim 1, characterized in that, The outer circumferential surface of the nut seat (3) is provided with a cooling groove, which together with the cooling sleeve (4) forms the cooling channel (41).

3. The nut rotation drive screw transmission structure according to claim 2, characterized in that, The cooling groove is spirally arranged along the circumference of the nut seat (3); Alternatively, the cooling groove extends circumferentially along the nut seat (3), and multiple cooling grooves are spaced apart axially along the nut seat (3); Alternatively, the cooling groove extends axially along the nut seat (3), and multiple cooling grooves are spaced apart circumferentially along the nut seat (3).

4. A nut rotation drive screw transmission structure according to any one of claims 1-3, characterized in that, Both ends of the cooling sleeve (4) are provided with sealing rings (43), which are sleeved on the outside of the nut seat (3) and located between the cooling sleeve (4) and the nut seat (3).

5. The nut rotation drive screw transmission structure according to claim 4, characterized in that, The outer circumferential surface of the nut seat (3) and / or the inner circumferential surface of the cooling sleeve (4) are provided with receiving grooves (31), and at least a portion of the sealing ring (43) is located in the receiving grooves (31).

6. A nut rotation drive screw transmission structure according to any one of claims 1-3, characterized in that, The nut seat (3) is provided with a stop wall (32), and the cooling sleeve (4) has an inner end that stops and cooperates with the stop wall (32).

7. The nut rotation drive screw transmission structure according to claim 6, characterized in that, The cooling sleeve (4) also has an outer end opposite to the inner end, and the nut seat (3) is provided with a stop plate (33), which is located on the side of the outer end away from the inner end and can cooperate with the stop plate of the outer end.

8. A nut rotation drive screw transmission structure according to any one of claims 1-3, characterized in that, The inner circumferential surface of the nut seat (3) and / or the outer circumferential surface of the nut (2) are provided with an oil receiving groove (21). The nut seat (3) is provided with an oil injection channel (34). The oil injection channel (34) has an oil inlet located on the outer wall of the nut seat (3) and an oil outlet located on the inner circumferential surface of the nut seat (3). The oil outlet is arranged opposite to the oil receiving groove (21).

9. The nut rotation drive screw transmission structure according to claim 8, characterized in that, The inner circumferential surface of the nut seat (3) is provided with a boss (35) surrounding the nut (2). Both ends of the boss (35) are provided with a sealing element (22) sleeved on the outside of the nut (2). The sealing element (22) is located inside the nut seat (3), and the oil groove (21) is located between the two sealing elements (22).

10. A machine tool, characterized in that, Includes the nut rotation drive screw transmission structure as described in any one of claims 1-9 above.

Images