Temperature control device for high-precision linear feed system of machine tool

Abstract

The utility model belongs to lathe design technical field, specifically disclose a high accuracy linear feed system's temperature control device for lathe. The device's screw rod both ends rotation extends to screw rod seat and motor seat, screw rod nut is equipped on the screw rod between screw rod seat and motor seat, motor is fixed through motor connecting plate and motor seat, motor rotating shaft is connected with screw rod through elastic coupling, screw rod one end rotation penetrates seat body, water inlet disc sealed fixed in seat body one end and forms cavity inside, screw rod extends to water inlet disc cavity, water inlet disc cavity spacer is equipped with the sealing ring that coordinates with screw rod, water inlet disc end surface is equipped with water inlet I and is equipped with backwater mouth I on lateral wall, screw rod one end is equipped with the blind hole that extends more than the place of rotating support in motor seat, the flow guide pipe that extends to the place of rotating support in motor seat is movably equipped in screw rod blind hole, flow guide pipe and water inlet I of water inlet disc intercommunication. The utility model has the characteristics of compact structure, less heat, low in cost, high reliability.

Description

Technical Field

[0001] This utility model relates to the field of machine tool design technology, specifically to a temperature control device for a high-precision linear feed system for machine tools that is compact, generates little heat, has low cost, and high reliability. Background Technology

[0002] The lead screw (usually referring to a ball screw or trapezoidal lead screw) is one of the core components of a machine tool's linear feed system. It is primarily used to convert rotary motion into linear motion, or vice versa. Therefore, the quality and operational stability of the lead screw are crucial to ensuring the accuracy of the linear feed system. However, during operation, the lead screw generates heat due to friction in the support structure, the engagement of the lead screw nut, and the high-speed rotation of the lead screw drive motor. This heat is transferred to the lead screw, which can easily lead to deformation, affecting operational stability and ultimately degrading the accuracy of the linear feed system.

[0003] To manage the thermal performance of lead screws, cooling devices are typically used to control their thermal deformation, particularly common in high-precision linear mechanisms of high-precision machine tools. Currently, common lead screw cooling devices include nut cooling and hollow lead screw cooling. Nut cooling targets the external structure of the lead screw and nut assembly, using a medium (oil, water, or air) to remove frictional heat from the contact surface. Hollow lead screw cooling involves machining hollow channels inside the lead screw, allowing the cooling medium (oil or water) to flow directly through the core, absorbing heat from within and achieving more uniform temperature control. While nut cooling is relatively simple in structure, its limited cooling effect restricts its application to ultra-high-speed, high-precision machine tool linear mechanisms because it only cools the nut. Hollow lead screw cooling, while offering better cooling, is typically supplied as a complete system by high-end lead screw manufacturers, resulting in higher costs and hindering widespread adoption. Furthermore, existing hollow lead screw cooling structures are complex, leading to difficulties in maintenance. Furthermore, existing high-precision linear mechanism systems only cool the lead screw feed, often without controlling the heat source of the lead screw drive motor, or use a separate cooling control device independent of the lead screw cooling device. This not only increases the complexity of the structure, but also makes it difficult to coordinate the temperature control effects of the two cooling control devices, thus making it difficult to effectively control the thermal deformation of the lead screw.

[0004] Therefore, how to effectively reduce the cost of the lead screw temperature control device and comprehensively consider the heat source control throughout the entire length of the lead screw to reduce heat generation is one of the technical challenges that high-precision linear mechanism systems urgently need to solve. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a temperature control device for a high-precision linear feed system for machine tools that is compact, generates less heat, has low cost, and high reliability.

[0006] The temperature control device for the high-precision linear feed system of this utility model is implemented as follows: it includes a lead screw, a lead screw seat, a lead screw nut, a motor seat, a motor connecting plate, a flexible coupling, and a motor. The two ends of the lead screw extend rotatably into the lead screw seat and the motor seat, respectively. The lead screw nut is threadedly fitted onto the lead screw between the lead screw seat and the motor seat. The motor is fixedly connected to the end of the motor seat away from the lead screw seat through the motor connecting plate. The motor shaft is connected to one end of the lead screw through the flexible coupling.

[0007] The lead screw seat includes a seat body and a water inlet pan. The end of the lead screw away from the motor rotates through the seat body. The water inlet pan is detachably and sealed at the end of the seat body away from the motor and forms a cavity inside. One end of the lead screw extends into the cavity of the water inlet pan. A sealing ring that mates with the outer surface of the lead screw is fitted inside the cavity of the water inlet pan. A water inlet I connected to the water supply pipe of the coolant system is provided on the end face of the water inlet pan. A water return I connected to the water return pipe of the coolant system is provided on the side wall of the water inlet pan near the sealing ring. A blind hole extending beyond the rotating support inside the motor seat is coaxially provided at the end of the lead screw facing the lead screw seat. A guide pipe extending to the rotating support inside the motor seat is movably disposed in the blind hole of the lead screw. The other end of the guide pipe is fixedly connected to the water inlet I on the end face of the water inlet pan.

[0008] Furthermore, a water collection trough is provided on the inner wall of the water inlet plate on the side away from the water inlet I from the sealing ring, and an overflow hole with one end connected to the water collection trough is provided on the outer wall of the water inlet plate.

[0009] Furthermore, an installation groove is provided on the inner wall of the water inlet tray, and the sealing ring is embedded in the installation groove and axially fixed by a retaining ring embedded in the installation groove.

[0010] Furthermore, the sealing lip of the sealing ring contacts the outer circular surface of the lead screw, and the roughness of the outer circular surface of the lead screw in contact with the sealing lip of the sealing ring is not greater than Ra0.4.

[0011] Furthermore, a spacer I and an outer cover I are provided between the seat and the water inlet plate. The spacer I is slidably sleeved on the outer circular surface of the lead screw, with one end abutting against the inner ring of the rolling bearing in the seat and the other end abutting against the preload nut I on the lead screw. The outer cover I is movably sleeved on the spacer I and its two ends are fixedly connected to the end faces of the seat and the water inlet plate, respectively. A labyrinth-type non-contact seal is formed between the outer cover I and the spacer I.

[0012] Furthermore, a sealing ring platform I with an inverted "L" shaped cross-section is provided on the outer circular surface of the spacer I, and a sealing ring platform II with an "L" shaped cross-section is provided on the inner wall of the outer cover I. The sealing ring platform I of the spacer I is movably embedded in the sealing ring platform II of the outer cover I to form a labyrinth-type non-contact seal.

[0013] Furthermore, the two ends of the motor connecting plate are respectively detachably fixedly connected to the motor base and the motor. The motor shaft movably passes through the motor connecting plate and is connected to the flexible coupling. An annular cooling cavity is provided inside the motor connecting plate. The side wall of the motor connecting plate is respectively provided with a water inlet II and a water return II communicating with the cooling cavity. The water inlet II and the water return II are respectively connected to the water supply pipe and the water return pipe of the coolant system.

[0014] Furthermore, the cooling chamber is an open ring coaxial with the motor shaft but not connected at the beginning and end. The water inlet II and the water outlet II are respectively connected to the beginning and end of the cooling chamber. The cooling chamber and the cooling water pipe of the water inlet plate are connected in series and then connected to the coolant system.

[0015] Furthermore, the motor base is provided with a spacer II that is slidably sleeved on the outer circular surface of the lead screw on the side near the motor. The spacer II is coaxially and movably sleeved with an outer cover II. One end of the spacer II abuts against the inner ring of the rolling bearing inside the motor base and the other end abuts against the preload nut II on the lead screw. The outer cover II is detachably and fixedly connected to the motor base and one end abuts against the outer ring of the rolling bearing inside the motor base. A labyrinth-type non-contact seal is formed between the spacer II and the outer cover II.

[0016] Furthermore, a sealing ring platform Ⅲ with an inverted "L" shaped cross-section is provided on the outer circular surface of the spacer Ⅱ, and a sealing ring platform Ⅳ with an "L" shaped cross-section is provided on the inner wall of the outer cover Ⅱ. The sealing ring platform Ⅲ of the spacer Ⅱ is movably embedded in the sealing ring platform Ⅳ of the outer cover Ⅱ to form a labyrinth-type non-contact seal.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model optimizes the design of the water inlet tray of the lead screw seat, and, in conjunction with the blind hole and guide pipe inside the lead screw, effectively controls the heat sources such as friction of the lead screw support structure and engagement of the lead screw nut through the coolant system. This simplifies the cooling control structure, facilitates later maintenance, and effectively reduces costs. In particular, the optimized design of the motor connection plate, with both the water inlet tray and the motor connection plate connected to the coolant system, not only simplifies the overall structure compared to existing separate cooling devices, but also avoids the problem of temperature control coordination difficulties between two independent cooling control devices, thereby effectively reducing overall costs and resulting in a compact structure.

[0019] 2. The optimized design of the water inlet plate of the lead screw seat in this utility model, combined with the guide pipe inside the blind hole of the lead screw, allows the coolant to directly cool the lead screw. Combined with the cooling cavity inside the motor connecting plate to block the heat conduction of the motor, it realizes comprehensive control of the heat source along the entire length of the lead screw. This ensures that the temperature of the high-precision linear feed system remains stable, effectively suppresses the thermal deformation of the lead screw, and improves the accuracy of the linear feed system.

[0020] 3. This utility model effectively prevents leakage of coolant from the lead screw by using a sealing ring design inside the water inlet pan and a labyrinth-type non-contact sealing structure between the spacer I between the base and the water inlet pan and the outer cover I, thus improving the sealing performance and reliability of the device. At the same time, the roughness requirements of the contact area between the lead screw and the sealing ring and the optimization of the connection structure further enhance the sealing effect, ensure the stable operation of the cooling system, and reduce maintenance costs and frequency.

[0021] 4. The spacer I between the base and the water inlet plate and the outer cover I, as well as the spacer II between the motor base and the outer cover II, all adopt a labyrinth-type non-contact sealing structure. This not only effectively ensures that the rolling bearings inside the base and motor base are not affected by foreign objects during high-speed movement, thereby improving the reliability of the high-precision linear feed system and ensuring motion accuracy, but also significantly reduces the heat generated during high-speed movement.

[0022] In summary, this utility model features a compact structure, low heat generation, low cost, and high reliability. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 for Figure 1 Enlarged view of the left side;

[0025] Figure 3 This is an enlarged view of the water inlet tray of this utility model;

[0026] Figure 4 for Figure 2 Enlarged view of point A;

[0027] Figure 5 This is an enlarged view of the motor connection plate of this utility model;

[0028] Figure 6 for Figure 1 Enlarged view of point B;

[0029] In the diagram: 1-Lead screw, 2-Lead screw seat, 2-1-Seat body, 2-2-Inlet pan, 2-21-Inlet I, 2-22-Return port I, 2-23-Water collection trough, 2-24-Overflow hole, 2-25-Mounting groove, 2-3-Retaining ring, 2-4-Sealing ring, 2-5-Return connector, 2-6-Spacer I, 2-7-Outer cover I, 2-8-Preload nut I, 3-Lead screw nut, 4-Motor base, 6-Motor connecting plate, 6-1-Cooling chamber, 6-2-Inlet II, 6-3-Return port II, 7-Flexible coupling, 8-Guide pipe, 9-Motor, 10-Spacer II, 11-Outer cover II, 12-Preload nut II Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0031] like Figures 1 to 6 As shown, the temperature control device for a high-precision linear feed system for machine tools of this utility model includes a lead screw 1, a lead screw seat 2, a lead screw nut 3, a motor seat 4, a motor connecting plate 6, a flexible coupling 7, and a motor 9. The two ends of the lead screw 1 extend rotatably into the lead screw seat 2 and the motor seat 4, respectively. The lead screw nut 3 is threadedly fitted onto the lead screw 1 between the lead screw seat 2 and the motor seat 4. The motor 9 is fixedly connected to the end of the motor seat 4 away from the lead screw seat 2 through the motor connecting plate 6. The rotating shaft of the motor 9 is connected to one end of the lead screw 1 through the flexible coupling 7.

[0032] The lead screw seat 2 includes a seat body 2-1 and a water inlet plate 2-2. The end of the lead screw 1 away from the motor 9 rotates through the seat body 2-1. The water inlet plate 2-2 is detachably and sealed at the end of the seat body 2-1 away from the motor 9 and forms a cavity inside. One end of the lead screw 1 extends into the cavity of the water inlet plate 2-2. A sealing ring 2-4 that mates with the outer surface of the lead screw 1 is fitted inside the cavity of the water inlet plate 2-2. A water inlet connected to the water supply pipe of the coolant system is provided on the end face of the water inlet plate 2-2. The water inlet 12-21 is provided on the side wall of the water inlet 2-2, on the side of the sealing ring 2-4 near the water inlet 12-21, and is connected to the return water pipe of the coolant system. The end of the lead screw 1 facing the lead screw seat 2 is provided with a blind hole extending beyond the rotating support inside the motor seat 4. A guide pipe 8 is movably provided in the blind hole of the lead screw 1, with one end extending to the rotating support inside the motor seat 4. The other end of the guide pipe 8 is fixedly connected to the water inlet 12-21 on the end face of the water inlet 2-2.

[0033] like Figure 2 and 3As shown, a water collection trough 2-23 is provided on the inner wall of the water inlet plate 2-2 on the side of the sealing ring 2-4 away from the water inlet I 2-21, and an overflow hole 2-24 with one end connected to the water collection trough 2-23 is provided on the outer wall of the water inlet plate 2-2.

[0034] The inner wall of the water inlet plate 2-2 is provided with an installation groove 2-25, and the sealing ring 2-4 is embedded in the installation groove 2-25 and is axially fixed by the retaining ring 2-3 embedded in the installation groove 2-25.

[0035] The sealing lip of the sealing ring 2-4 is in contact with the outer circular surface of the lead screw 1, and the roughness of the outer circular surface of the lead screw 1 in contact with the sealing lip of the sealing ring 2-4 is not greater than Ra0.4.

[0036] like Figure 4 As shown, a spacer I2-6 and an outer cover I2-7 are also provided between the seat 2-1 and the water inlet plate 2-2. The spacer I2-6 is slidably sleeved on the outer circular surface of the lead screw 1, with one end abutting against the inner ring of the rolling bearing inside the seat 2-1 and the other end abutting against the preload nut I2-8 on the lead screw 1. The outer cover I2-7 is movably sleeved on the spacer I2-6 and its two ends are fixedly connected to the end faces of the seat 2-1 and the water inlet plate 2-2, respectively. A labyrinth-type non-contact seal is formed between the outer cover I2-7 and the spacer I2-6.

[0037] The outer circular surface of the spacer I2-6 is provided with a sealing ring platform I with an inverted "L" shaped cross section, and the inner wall of the outer cover I2-7 is provided with a sealing ring platform II with an "L" shaped cross section. The sealing ring platform I of the spacer I2-6 is movably embedded in the sealing ring platform II of the outer cover I2-7 to form a labyrinth-type non-contact seal.

[0038] like Figure 1 and 5 As shown, the two ends of the motor connecting plate 6 are detachably and fixedly connected to the motor base 4 and the motor 9, respectively. The rotating shaft of the motor 9 movably passes through the motor connecting plate 6 and is connected to the flexible coupling 7. An annular cooling chamber 6-1 is provided inside the motor connecting plate 6. The side wall of the motor connecting plate 6 is provided with a water inlet II 6-2 and a water return II 6-3 communicating with the cooling chamber 6-1, respectively. The water inlet II 6-2 and the water return II 6-3 are respectively connected to the water supply pipe and the water return pipe of the coolant system.

[0039] The cooling chamber 6-1 is an open ring coaxial with the shaft of the motor 9 but not connected at either end. The water inlet II 6-2 and the water outlet II 6-3 are connected to the beginning and end of the cooling chamber 6-1, respectively. The cooling chamber 6-1 is connected in series with the cooling water pipe of the water inlet plate 2-2 and then connected to the coolant system. The cooling chambers of the lead screw and the motor mount are connected to the coolant system in series, which not only enables temperature control of the heat-generating components and suppresses thermal deformation to improve the accuracy and accuracy retention of the lead screw transmission system, but also further simplifies the control of the coolant system.

[0040] The inlet II6-2 and the outlet I2-22 are connected by a pipeline, the outlet II6-3 is connected to the return water pipe of the coolant system, and the inlet I2-21 is connected to the supply water pipe of the coolant system.

[0041] The coolant system provides a constant-temperature coolant.

[0042] like Figure 6 As shown, the motor base 4 is provided with a spacer II10 that is slidably sleeved on the outer circular surface of the lead screw 1 on the side near the motor 9. The spacer II10 is coaxially and movably sleeved with an outer cover II11. One end of the spacer II10 abuts against the inner ring of the rolling bearing in the motor base 4 and the other end abuts against the preload nut II12 on the lead screw 1. The outer cover II11 is detachably fixedly connected to the motor base 4 and one end abuts against the outer ring of the rolling bearing in the motor base 4. A labyrinth-type non-contact seal is formed between the spacer II10 and the outer cover II11.

[0043] The outer circular surface of the spacer II10 is provided with a sealing ring platform III with an inverted "L" shaped cross section, and the inner wall of the outer cover II11 is provided with a sealing ring platform IV with an "L" shaped cross section. The sealing ring platform III of the spacer II10 is movably embedded in the sealing ring platform IV of the outer cover II11 to form a labyrinth-type non-contact seal.

[0044] The working principle and process of this utility model:

[0045] like Figures 1 to 6As shown, when the high-precision linear feed system is working, the motor 9 rotates at high speed under the control of the controller. The flexible coupling 7 drives the lead screw 1 to rotate under the support of rolling bearings in the base 2-1 and the motor base 4, thereby driving the lead screw nut 3 meshing on it to move linearly. During the high-speed rotation of the lead screw 1, constant temperature cooling water or constant temperature cooling oil (i.e., coolant) is introduced into the guide pipe 8 in the water inlet pan 2-2 through the coolant system to effectively control the friction of the rolling bearings on the lead screw 1 and the meshing heat source of the lead screw nut 3. At the same time, the coolant system introduces constant temperature cooling water or constant temperature cooling oil into the cooling chamber 6-1 of the motor connecting plate 6 to block the heat of the motor 9 from being conducted to the motor base 4 and the lead screw 1, thereby achieving comprehensive control of the heat source along the entire length of the lead screw 1, ensuring that the temperature of the high-precision linear feed system is in a stable state, and effectively suppressing the thermal deformation of the lead screw 1. Furthermore, the constant-temperature cooling water or oil in the cavity of the water inlet pan 2-2 is sealed by the sealing ring 2-4 to prevent it from entering the rolling bearing side near the seat 2-1. A water collection groove 2-23 and an overflow hole 2-24 are also provided on the side of the water inlet pan 2-2 near the seat 2-1, which can further eject any small amount of constant-temperature cooling water or oil that has passed through the sealing ring 2-4 at high speed, preventing it from affecting the normal operation and service life of the rolling bearing in the seat 2-1. In particular, a labyrinth-type non-contact sealing structure is used between the spacer I2-6 and the outer cover I2-7 between the seat 2-1 and the water inlet pan 2-2, and between the spacer II10 and the outer cover II11 of the motor seat 4. This effectively ensures that the rolling bearings inside the seat 2-1 and the motor seat 4 are not affected by foreign object intrusion during high-speed movement, improving the reliability of the high-precision linear feed system and ensuring motion accuracy. Moreover, the labyrinth-type non-contact sealing structure can significantly reduce heat generation during high-speed movement.

[0046] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A temperature control device for a high-precision linear feed system for machine tools, comprising a lead screw (1), a lead screw seat (2), a lead screw nut (3), a motor seat (4), a motor connecting plate (6), a flexible coupling (7), and a motor (9). The two ends of the lead screw (1) are respectively rotatably extended into the lead screw seat (2) and the motor seat (4). The lead screw nut (3) is threadedly fitted onto the lead screw (1) between the lead screw seat (2) and the motor seat (4). The motor (9) is fixedly connected to the end of the motor seat (4) away from the lead screw seat (2) through the motor connecting plate (6). The rotating shaft of the motor (9) is connected to one end of the lead screw (1) through the flexible coupling (7). Its features are: The lead screw seat (2) includes a seat body (2-1) and a water inlet plate (2-2). The end of the lead screw (1) away from the motor (9) rotates through the seat body (2-1). The water inlet plate (2-2) is detachably and sealedly fixed at the end of the seat body (2-1) away from the motor (9) and forms a cavity inside. One end of the lead screw (1) extends into the cavity of the water inlet plate (2-2). A sealing ring (2-4) that mates with the outer circular surface of the lead screw (1) is fitted inside the cavity of the water inlet plate (2-2). An inlet valve connected to the water supply pipe of the coolant system is provided on the end face of the water inlet plate (2-2). Water inlet I (2-21), and a return water inlet I (2-22) connected to the return water pipe of the coolant system is provided on the side wall of the water inlet plate (2-2) near the water inlet I (2-21) of the sealing ring (2-4). A blind hole extending beyond the rotating support inside the motor seat (4) is provided on the end of the lead screw (1) facing the lead screw seat (2). A guide pipe (8) extending to the rotating support inside the motor seat (4) is movably provided in the blind hole of the lead screw (1). The other end of the guide pipe (8) is fixedly connected to the water inlet I (2-21) on the end face of the water inlet plate (2-2).

2. The temperature control device for a high-precision linear feed system for machine tools according to claim 1, characterized in that: On the inner wall of the water inlet plate (2-2), a water collection trough (2-23) is provided on the side of the sealing ring (2-4) away from the water inlet I (2-21). On the outer wall of the water inlet plate (2-2), an overflow hole (2-24) is provided with one end connected to the water collection trough (2-23).

3. The temperature control device for a high-precision linear feed system for machine tools according to claim 1, characterized in that: The inner wall of the water inlet tray (2-2) is provided with an installation groove (2-25), and the sealing ring (2-4) is embedded in the installation groove (2-25) and axially fixed by the retaining ring (2-3) embedded in the installation groove (2-25).

4. The temperature control device for a high-precision linear feed system for machine tools according to claim 3, characterized in that: The sealing lip of the sealing ring (2-4) is in contact with the outer circular surface of the lead screw (1), and the roughness of the outer circular surface of the lead screw (1) in contact with the sealing lip of the sealing ring (2-4) is not greater than Ra0.

4.

5. The temperature control device for a high-precision linear feed system for machine tools according to claim 1, characterized in that: A spacer I (2-6) and an outer cover I (2-7) are also provided between the seat (2-1) and the water inlet plate (2-2). The spacer I (2-6) is slidably sleeved on the outer circular surface of the lead screw (1), with one end abutting against the inner ring of the rolling bearing in the seat (2-1) and the other end abutting against the pre-tightening nut I (2-8) on the lead screw (1). The outer cover I (2-7) is movably sleeved on the spacer I (2-6), with both ends fixedly connected to the end faces of the seat (2-1) and the water inlet plate (2-2) respectively. A labyrinth-type non-contact seal is formed between the outer cover I (2-7) and the spacer I (2-6).

6. The temperature control device for a high-precision linear feed system for machine tools according to claim 5, characterized in that: The outer circular surface of the spacer I (2-6) is provided with a sealing ring platform I with an inverted "L" shaped cross section, and the inner wall of the outer cover I (2-7) is provided with a sealing ring platform II with an "L" shaped cross section. The sealing ring platform I of the spacer I (2-6) is movably embedded in the sealing ring platform II of the outer cover I (2-7) to form a labyrinth-type non-contact seal.

7. The temperature control device for a high-precision linear feed system for machine tools according to any one of claims 1 to 6, characterized in that: The two ends of the motor connecting plate (6) are detachably fixedly connected to the motor base (4) and the motor (9), respectively. The rotating shaft of the motor (9) passes through the motor connecting plate (6) and is connected to the flexible coupling (7). The motor connecting plate (6) is provided with an annular cooling chamber (6-1). The side wall of the motor connecting plate (6) is provided with a water inlet II (6-2) and a water return II (6-3) communicating with the cooling chamber (6-1), respectively. The water inlet II (6-2) and the water return II (6-3) are respectively connected to the water supply pipe and the water return pipe of the coolant system.

8. The temperature control device for a high-precision linear feed system for machine tools according to claim 7, characterized in that: The cooling chamber (6-1) is an open ring that is coaxial with the shaft of the motor (9) but not connected at the beginning and end. The water inlet II (6-2) and the water outlet II (6-3) are respectively connected to the beginning and end of the cooling chamber (6-1). The cooling water pipe of the cooling chamber (6-1) and the water inlet plate (2-2) are connected in series and then connected to the coolant system.

9. The temperature control device for a high-precision linear feed system for machine tools according to any one of claims 1 to 6, characterized in that: The motor base (4) is provided with a spacer II (10) that is slidably sleeved on the outer circle of the lead screw (1) on the side near the motor (9). The spacer II (10) is coaxially and movably sleeved with an outer cover II (11). One end of the spacer II (10) abuts against the inner ring of the rolling bearing in the motor base (4) and the other end abuts against the preload nut II (12) on the lead screw (1). The outer cover II (11) is detachably fixedly connected to the motor base (4) and one end abuts against the outer ring of the rolling bearing in the motor base (4). A labyrinth-type non-contact seal is formed between the spacer II (10) and the outer cover II (11).

10. The temperature control device for a high-precision linear feed system for machine tools according to claim 9, characterized in that: The outer circular surface of the spacer II (10) is provided with a sealing ring platform III with an inverted "L" shaped cross section, and the inner wall of the outer cover II (11) is provided with a sealing ring platform IV with an "L" shaped cross section. The sealing ring platform III of the spacer II (10) is movably embedded in the sealing ring platform IV of the outer cover II (11) to form a labyrinth-type non-contact seal.

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