A spindle drive for a turning machine

Abstract

The application relates to the technical field of lathe driving, and discloses a spindle driving device of a lathe, which comprises a rack, a servo motor, a spindle body and a driving shaft, friction discs are arranged on the spindle body and the driving shaft, hydraulic sleeves are arranged on the two sides of the friction discs, sealing disc racks are arranged in the hydraulic sleeves, connecting shaft bodies are fixedly arranged on the sealing disc racks, supports are further fixedly arranged at the ends of the connecting shaft bodies, friction blocks one and two are further arranged on one side of the supports, switching units are arranged in the connecting shaft bodies, the spindle driving device of the lathe brakes the friction discs by using the friction blocks one and two, the rotation state of the friction discs is controlled, the rotation of the spindle and the driving shaft can be effectively limited, the contact state between the friction blocks one and two and the friction discs can be effectively controlled under the action of the switching units, the speed of the friction discs can be effectively reduced by slightly interfering with the high-speed rotating friction discs.

Description

Technical Field

[0001] This invention relates to the field of turning machine tool drive technology, specifically to a spindle drive device for a turning machine tool. Background Technology

[0002] Turning machine tools use a spindle to position the workpiece through grippers, which then rotates the workpiece. The cutting tool cuts the workpiece by feeding. Common turning machine tool drive methods include electric spindle, gear drive, and belt drive. Among them, gear drive transmits power through a multi-stage gearbox, which has a wide transmission ratio range, high torque output, is suitable for low-speed, high-torque machining, has a wide constant power range, and high reliability. However, it has a complex structure, significant noise and vibration, and rapid temperature rise at high speeds, requiring an additional cooling system.

[0003] During workpiece machining, the drive source rotates multiple driving gears via the output shaft, which mesh with driven gears. Under the action of multi-gear meshing, the spindle rotates, causing the chuck to drive the workpiece to rotate. When the workpiece is finished or needs to be decelerated, the braking device on the drive unit is used to control the speed of the output shaft and the spindle. Currently, the most common braking scheme is friction plate braking, which achieves braking or deceleration through friction. However, in the actual braking process, the spindle and output shaft are in a high-speed rotation state at the initial stage of braking. When the friction plate contacts the high-speed rotating spindle or output shaft, it often generates excessive impact load. On the one hand, it is easy to cause vibration of the spindle system. On the other hand, the impact load generated by the friction plate contacting the high-speed rotating spindle and output shaft will cause multi-level compound damage to the gear system. Therefore, we propose a spindle drive device for turning machine tools. Summary of the Invention

[0004] The purpose of this invention is to provide a spindle drive device for a turning machine tool to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a spindle drive device for a turning machine tool, comprising a frame installed inside a machine compartment, a servo motor fixedly installed on one side of the machine compartment, and a spindle body and a drive shaft rotatably connected thereto installed inside the frame, the output end of the servo motor passing through the machine compartment and fixedly connected to the drive shaft, a drive gear assembly being provided on the drive shaft, and a driven gear assembly being provided on the spindle body, wherein a chuck rotatably connected thereto is installed on the machine compartment, and the end of the spindle body is fixedly connected to the chuck;

[0006] Friction discs are fixedly mounted on both the main shaft body and the drive shaft. Hydraulic sleeves are provided on both sides of each friction disc, and a sealing disc frame is installed inside the hydraulic sleeve. A connecting shaft is fixedly mounted on the sealing disc frame, and the end of the connecting shaft passes through the end of the hydraulic sleeve and extends to the outside. A bracket is also fixedly mounted on the end of the connecting shaft, and friction block one and friction block two are provided on one side of the bracket. A switching unit is provided inside the connecting shaft, and the switching unit is used to control the contact state between friction block one and friction block two and the friction disc.

[0007] Preferably, a steel plate frame that is symmetrically mounted on the friction block one and slidably connected to the inner wall of the bracket is provided, and a steel shaft is symmetrically mounted on the friction block two. A limit shaft is rotatably mounted on both the steel plate frame and the steel shaft, and a ball bearing is embedded at the end of the limit shaft.

[0008] Preferably, the switching unit includes a rotating sleeve installed inside the connecting shaft and rotatably connected to its inner wall, and the outer wall of the rotating sleeve is symmetrically equipped with arc-shaped slide rails, and the inner wall of the rotating sleeve is symmetrically provided with arc-shaped grooves. The limiting shaft on the steel plate frame slides within the arc-shaped slide rails, and the limiting shaft on the steel shaft slides within the arc-shaped grooves.

[0009] Preferably, the arc-shaped slide rail includes a sliding area, an arc-shaped inclined area, and an annular area, and the arc-shaped groove includes a first arc-shaped area, a straight area, and a second arc-shaped area.

[0010] Preferably, the area of ​​friction block one is larger than the area of ​​friction block two.

[0011] Preferably, a sliding shaft is installed inside the connecting shaft and is slidably connected to its inner wall. One end of the sliding shaft has a cavity, and an annular panel is fixedly installed on the sliding shaft. The annular panel has multiple through holes, and a spring body is connected between the annular panel and the inner wall of the connecting shaft.

[0012] Preferably, a plurality of positioning sleeves are installed on the connecting shaft, and a positioning shaft is slidably connected to the inner wall of each positioning sleeve. Both ends of the positioning shaft pass through the end of the positioning sleeve, and ball bearings are embedded in both ends of the positioning shaft. One end of the positioning shaft extends into the through hole, and a return spring is connected between the positioning shaft and the inner wall of the positioning sleeve.

[0013] Preferably, the inner wall of the hydraulic sleeve has a cavity, and the cross-section of the cavity is a right trapezoidal shape.

[0014] Preferably, the outer wall of the sliding shaft is provided with a spiral groove, and a plurality of ball bearings are installed inside the rotating sleeve, and the ball bearings slide within the spiral groove.

[0015] Preferably, both friction block one and friction block two are equipped with guide shafts that are slidably connected to the bracket, and a spring mechanism is connected between the guide shafts and the side wall of the bracket.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention utilizes friction block one and friction block two to brake the friction disc. By controlling the rotation state of the friction disc, the rotation of the main shaft and drive shaft can be effectively limited. Under the action of the switching unit, the contact state between friction block one and friction block two and the friction disc can be effectively controlled. Since the area of ​​friction block two is smaller than that of friction block one, when the drive shaft drives the main shaft to rotate at high speed through the active gear assembly and the driven gear assembly, the speed of the friction disc can be effectively reduced by making small interference to the high-speed rotating friction disc, and the damage to related components on the main shaft and drive shaft can be reduced.

[0018] 2. This invention utilizes the hydraulic oil input to control the travel of the sliding shaft. Through the travel of the sliding shaft, the spiral groove on the sliding shaft applies force to the ball bearing on the inner wall of the rotating sleeve, thereby causing the rotating sleeve to rotate. By controlling the relationship between the limiting shaft, the arc-shaped slide rail, and the arc-shaped groove, the switching between friction block one and friction block two can be effectively controlled. At low speeds, friction block one and friction block two contact the friction disc to brake the relevant components on the main shaft and drive shaft. Through the structural design of this invention, damage to the drive device can be effectively reduced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the internal structure of the cabin of the present invention;

[0021] Figure 3 This is a schematic diagram of the frame structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the main spindle body and drive shaft structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the hydraulic sleeve structure of the present invention;

[0024] Figure 6 This is a schematic diagram of the internal structure of the hydraulic sleeve of the present invention;

[0025] Figure 7This is a schematic diagram of a partial internal structure of the hydraulic sleeve of the present invention;

[0026] Figure 8 This is a partial structural diagram of the switching unit of the present invention;

[0027] Figure 9 This is a schematic diagram of the structure of friction block one and friction block two and friction disk of the present invention;

[0028] Figure 10 This is a schematic diagram showing the separation of the friction block and the support structure of the present invention;

[0029] Figure 11 This is a schematic diagram of the arc-shaped guide rail structure of the present invention;

[0030] Figure 12 This is a schematic diagram showing the separation of the arc-shaped groove and the sliding shaft structure of the present invention;

[0031] Figure 13 For the present invention Figure 7 Enlarged schematic diagram of the structure of region A in the middle.

[0032] In the diagram: 1. Cabin; 2. Servo motor; 3. Frame; 4. Spindle body; 41. Driven gear assembly; 5. Drive shaft; 51. Drive gear assembly; 6. Clamping disc; 7. Friction disc; 8. Hydraulic sleeve; 81. Sealing disc frame; 82. Connecting shaft; 83. Bracket; 84. Friction block one; 841. Steel plate frame; 85. Friction block two; 851. Steel shaft; 86. Limiting shaft; 87. Cavity; 88. Guide shaft; 89. Spring mechanism; 9. Switching unit; 91 92. Rotating sleeve; 92. Arc-shaped slide rail; 921. Sliding area; 922. Arc-shaped inclined area; 923. Annular area; 93. Arc-shaped groove; 931. First arc-shaped area; 932. Straight-line area; 933. Second arc-shaped area; 94. Ball bearing; 10. Sliding shaft; 101. Cavity; 102. Annular panel; 103. Through hole; 104. Spring body; 105. Spiral groove; 11. Positioning sleeve; 111. Positioning shaft; 112. Return spring. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-13This invention provides a technical solution: a spindle drive device for a turning machine tool. This invention addresses the technical problems in the background art by making corresponding improvements, combined with the accompanying drawings. Figure 1-3 As shown, the system includes a machine compartment 1 mounted on a machine tool, with a chuck 6 rotatably connected to it on one side. A mounting frame 3 is fixedly mounted inside the machine compartment 1, and a spindle body 4 rotatably connected to it is mounted inside the mounting frame 3. One end of the spindle body 4 is fixedly connected to the chuck 6. A servo motor 2 is fixedly mounted outside the machine compartment 1, and a drive shaft 5 rotatably connected to it is mounted inside the frame 3. The output end of the servo motor 2 passes through the machine compartment 1 and is fixedly connected to the drive shaft 5. A drive gear assembly 51 composed of multiple drive gears is mounted on the drive shaft 5, and a drive gear assembly 51 composed of multiple drive gears is mounted on the spindle body 4. The spindle body 4 is equipped with a driven gear assembly 41 consisting of multiple driven gears, and a paddle assembly is also installed in the frame 3. The above components are used to describe the drive device of the spindle body 4 in the prior art. The servo motor 2 drives the drive gear assembly 51 to rotate through the drive shaft 5. Since the multiple drive gears on the drive gear assembly 51 are in a meshing state with the multiple driven gears on the driven gear assembly, the paddle assembly changes the meshing state between the gears, so that the spindle body 4 can be adjusted in multiple gears. The above drive devices are all based on the principle of prior art, and speed change is achieved by meshing between different gears. Therefore, the present invention will not elaborate further.

[0035] Furthermore, the present invention provides a corresponding design for the braking device on the spindle drive unit, so as to effectively reduce damage to components such as the spindle body 4, drive shaft 5, driving gear assembly 51, and driven gear assembly 41 when braking the spindle body 4 and drive shaft 5. Figure 4 and attached Figure 5As shown, friction discs 7 are fixedly mounted on both the main shaft and the drive shaft 5. Hydraulic sleeves 8 are provided on both sides of each friction disc 7. Each hydraulic sleeve 8 is connected to an oil pipe, and the oil flow is controlled by a valve. A sealing disc frame 81 is installed inside the hydraulic sleeve 8, and a connecting shaft 82 is fixedly mounted on the sealing disc frame 81. The end of the connecting shaft 82 passes through the end of the hydraulic sleeve 8 and extends to the outside. A bracket 83 is also fixedly mounted on the end of the connecting shaft 82. Friction block 1 84 and friction block 2 85 are provided on one side of the bracket 83. Friction block 1 84 is symmetrically mounted with… A steel plate frame 841 is slidably connected to the inner wall of the bracket 83, and steel shafts 851 slidably connected to the inner wall of the bracket 83 are symmetrically mounted on the second friction block 85. Guide shafts 88 slidably connected to the bracket 83 are mounted on both the first friction block 84 and the second friction block 85, and a spring mechanism 89 connects the guide shafts 88 to the side wall of the bracket 83. Thus, the first friction block 84 and the second friction block 85 can be directionally adjusted on the bracket 83. Limiting shafts 86 are rotatably mounted on both the steel plate frame 841 and the steel shafts 851, and ball bearings are embedded at the ends of the limiting shafts 86. Figure 5 and attached Figure 10 As shown, the area of ​​friction block 1 84 is larger than the area of ​​friction block 2 85. A switching unit 9 is provided inside the connecting shaft 82. The switching unit 9 controls the contact state of friction block 1 84 and friction block 2 85 with the friction disk 7. When the main shaft body 4 and the drive shaft 5 rotate, friction block 1 84 and friction block 2 85 can switch their contact with the friction disk 7 under the action of the switching unit 9, combined with the attached... Figure 9 As shown, in the initial braking stage, friction block 84 first contacts friction disc 7, and then friction block 85 contacts friction disc 7 through switching unit 9, while friction block 84 separates from friction disc 7. After the rotational speed of friction disc 7 decreases (i.e., the rotational speed of spindle body 4 and drive shaft 5 decreases), friction block 84 and friction block 85 are brought into contact with friction disc 7 by switching unit 9.

[0036] As a further limitation of this invention, in conjunction with the appendix Figure 6 - Appendix Figure 8 As shown, the switching unit 9 of this invention includes a rotating sleeve 91 installed inside the connecting shaft 82 and rotatably connected to its inner wall. The outer wall of the rotating sleeve 91 is symmetrically equipped with an arc-shaped slide rail 92, and the inner wall of the rotating sleeve 91 is symmetrically provided with an arc-shaped groove 93. A limiting shaft 86 on the steel plate frame 841 slides within the arc-shaped slide rail 92, and a limiting shaft 86 on the steel shaft 851 slides within the arc-shaped groove 93. The arc-shaped slide rail 92 includes a sliding area 921, an arc-shaped inclined area 922, and an annular area 923. The arc-shaped groove 93 includes a first arc-shaped area 931, a straight area 932, and a second arc-shaped area 933. (See attached diagram.) Figure 9As shown, during the braking process of the main shaft body 4 and the drive shaft 5, in the initial braking stage, friction block 2 85 contacts friction disk 7. Subsequently, under the action of the switching unit 9, friction block 2 85 is moved away from the contact point with the surface of friction disk 7, and friction block 1 84 is controlled to contact the surface of friction disk 7. When the speed decreases, under the action of the switching unit 9, friction block 1 84 and friction block 2 85 simultaneously contact friction disk 7, thereby increasing the friction force and enabling the drive device to be effectively braked.

[0037] A sliding shaft 10 is installed inside the connecting shaft 82 and slidably connected to its inner wall. One end of the sliding shaft 10 has a cavity 101, and an annular panel 102 is fixedly installed on the sliding shaft 10. The annular panel 102 has multiple through holes 103. A spring body 104 connects the annular panel 102 to the inner wall of the connecting shaft 82. Multiple positioning sleeves 11 are fixedly installed on the connecting shaft 82. Each positioning sleeve 11 has a positioning shaft 111 slidably connected to its inner wall. Both ends of the positioning shaft 111 penetrate the ends of the positioning sleeve 11, and both ends of the positioning shaft 111 are embedded in the cavity. The positioning shaft 111 has one end extending into the through hole 103. The outer wall of the sliding shaft 10 has a spiral groove 105. The rotating sleeve 91 has multiple ball parts 94 installed inside, and the ball parts 94 slide within the spiral groove 105. A return spring 112 is connected between the positioning shaft 111 and the inner wall of the positioning sleeve 11. A cavity 87 is provided on the inner wall of the hydraulic sleeve 8, and the cross-section of the cavity 87 is a right trapezoid. A constant force spring 80 is connected between the inner wall of the hydraulic sleeve 8 and the sealing disc frame 81. The spring coefficient of the constant force spring 80 is greater than the spring coefficient of the spring body 104.

[0038] In practical applications, when the drive unit of a turning machine tool drives the spindle body 4 to rotate, the spindle body 4 and the drive shaft 5 are transmitted through the drive gear assembly 51 and the driven gear assembly 41. At high speeds, the braking system on the drive unit forcibly intervenes in the high-speed rotation of the spindle body 4 and the drive shaft 5, which generates a large impact load. This can damage the relevant components on the drive unit (such as the drive gear assembly 51, the driven gear assembly 41, the spindle body 4, etc.). Based on this, in practical applications, this invention gradually reduces the rotational speed of the friction disk 7 (i.e., the rotational speed of the spindle body 4 and the drive shaft 5) by adjusting the contact state between the friction block 1 84 and the friction block 2 85 and the friction disk 7, thereby reducing damage to the relevant components on the drive unit.

[0039] Specifically, in conjunction with the appendix Figure 1 Appendix Figure 2 and attached Figure 3As shown, when the turning machine is working, the meshing state of the drive gear assembly 51 and the driven gear assembly 41 is adjusted using the paddle assembly, thereby adjusting the speed ratio between the spindle body 4 and the drive shaft 5. When the spindle body 4 and the drive shaft 5 are at high speed, and deceleration or braking is required, hydraulic oil is injected into the hydraulic sleeve 8, causing the sealing disc holder 81 to move within the hydraulic sleeve 8. During the movement of the sealing disc holder 81, the connecting shaft 82 moves synchronously with it, combined with the attached... Figure 6 and attached Figure 7 As shown, in the initial state, i.e. no hydraulic oil is supplied, friction block 2 85 is not in contact with friction disc 7, and positioning shaft 111 has not moved to cavity 87. Positioning shaft 111 squeezes the return spring 112 inside positioning sleeve 11. As hydraulic oil is supplied, connecting shaft 82 will drive rotating sleeve 91, bracket 83, friction block 1 84 and friction block 2 85 to move accordingly, so that friction block 2 85 contacts friction disc 7. Since the area of ​​friction block 2 85 is small, it can interfere with the high-speed rotating friction disc 7 with a small amount, avoiding damage to the main shaft body 4 and drive shaft 5 caused by forcibly interfering with the high-speed rotating friction disc 7. By contacting friction disc 7 with the small-area friction block 2 85, the speed of friction disc 7 can be effectively reduced, and damage to related components on main shaft body 4 and drive shaft 5 can be reduced.

[0040] Combined with appendix Figure 6 and attached Figure 7 As shown, when friction block 84 contacts friction disc 7, positioning shaft 111 moves into cavity 87, which has a right-angled trapezoidal cross-section. Under the action of compressed return spring 112, positioning shaft 111 enters cavity 87. At this time, the other end of positioning shaft 111 leaves through hole 103, and the limiting of annular panel 102 is made into contact. A small amount of hydraulic oil continues to flow in. Since the spring coefficient of constant force spring 80 is greater than the spring coefficient of spring body 104, the hydraulic oil passes through cavity 101 to apply force to sliding shaft 10, causing sliding shaft 10 to... The spring body 104 is in a stretched state under the action of the annular panel 102. During the movement of the sliding shaft 10, the spiral groove 105 on its surface applies a force to the ball bearing 94 on the inner wall of the rotating sleeve 91, thereby causing the rotating sleeve 91 to rotate in a position inside the connecting shaft 82. During the rotation of the rotating sleeve 91, the arc-shaped slide rail 92 on its outer wall and the arc-shaped groove 93 on its inner wall apply a force to the limiting shaft 86 on the steel plate frame 841 and the limiting shaft 86 on the steel shaft 851, respectively. Figure 11 and attached Figure 12As shown, in the initial state, the limiting shaft 86 on the steel plate frame 841 is located on the sliding area 921 of the arc-shaped slide rail 92, and the limiting shaft 86 on the steel shaft 851 is located at the initial position of the first arc-shaped area 931. As the rotating sleeve 91 rotates, the limiting shaft 86 on the steel plate frame 841 will enter the arc-shaped inclined area 922 and eventually move to the intersection of the arc-shaped inclined area 922 and the annular area 923. At this time, the steel plate frame 841 is acted upon by the arc-shaped inclined area 922, causing the friction block 84 to contact the friction disk 7. During this process, the first arc-shaped area 931 of the arc-shaped groove 93 will apply a force to the limiting shaft 86 on the steel shaft 851, and the steel shaft 851... The limiting shaft 86 eventually enters the straight-line area 932. The position of the limiting shaft 86 on the steel shaft 851 changes within the arc-shaped groove 93, causing the second friction block 85 to leave the surface of the friction disc 7. At this point, the first friction block 84 contacts the surface of the friction disc 7, while the second friction block 85 separates from the surface of the friction disc 7. Since the area of ​​the first friction block 84 is larger than that of the second friction block 85, when the speed of the friction disc 7 decreases, by switching to contact between the first friction block 84 and the friction disc 7, the contact area with the friction disc 7 is gradually increased, thereby increasing the braking effect on the friction disc 7, gradually reducing the rotational speed of the friction disc 7, avoiding forced intervention on the high-speed rotating friction disc 7, and preventing damage to the main shaft body 4 and the drive shaft 5.

[0041] When the rotational speed of the friction disc 7 (i.e., the main shaft body 4 and the drive shaft 5) decreases significantly, a small amount of hydraulic oil continues to be supplied, causing the sliding shaft 10 to continue its directional movement. Under the action of the spiral groove 105, the rotating sleeve 91 continues to rotate, causing the arc-shaped slide rail 92 on the outer wall and the arc-shaped groove 93 on the inner wall of the rotating sleeve 91 to continue to exert force on the limiting shaft 86 on the steel plate frame 841 and the limiting shaft 86 on the steel shaft 851. Consequently, the limiting shaft 86 on the steel plate frame 841 will move within the annular region 923, while the steel shaft 851... The limiting shaft 86 will enter the second arc-shaped area 933 from the straight area 932. At this time, under the action of the steel shaft 851, the second friction block 85 will contact the friction plate. As a result, after the speed of the friction disc 7 decreases significantly, both the first friction block 84 and the second friction block 85 will contact the friction disc 7, thereby braking the rotation of the main shaft body 4 and the drive shaft 5. When the main shaft body 4 and the drive shaft 5 stop rotating, the hydraulic oil is recovered. Under the action of the constant force spring 80, the above components return to the initial position, that is, both the first friction block 84 and the second friction block 85 separate from the friction disc 7.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spindle drive device for a turning machine tool, characterized in that, The system includes a frame (3) installed inside the cabin (1), a servo motor (2) fixedly installed on one side of the cabin (1), and a spindle body (4) and a drive shaft (5) rotatably connected to the servo motor (2) installed inside the frame (3). The output end of the servo motor (2) passes through the cabin (1) and is fixedly connected to the drive shaft (5). An active gear assembly (51) is provided on the drive shaft (5), and a driven gear assembly (41) is provided on the spindle body (4). A chuck (6) rotatably connected to the spindle body (1) is installed on the cabin (1), and the end of the spindle body (4) is fixedly connected to the chuck (6). Friction discs (7) are fixedly installed on both the main shaft body (4) and the drive shaft (5). Hydraulic sleeves (8) are provided on both sides of each friction disc (7). A sealing disc frame (81) is installed inside the hydraulic sleeve (8), and a connecting shaft (82) is fixedly installed on the sealing disc frame (81). The end of the connecting shaft (82) passes through the end of the hydraulic sleeve (8) and extends to the outside. A bracket (83) is also fixedly installed at the end of the connecting shaft (82), and friction block one (84) and friction block two (85) are provided on one side of the bracket (83). 85), the connecting shaft (82) is provided with a switching unit (9), the switching unit (9) is used to control the contact state of friction block one (84) and friction block two (85) with friction disc (7); a steel plate frame (841) symmetrically installed on friction block one (84) and slidably connected to the inner wall of bracket (83) is provided; a steel shaft (851) symmetrically installed on friction block two (85) is provided; a limiting shaft (86) is rotatably installed on the steel plate frame (841) and the steel shaft (851), and a ball is embedded at the end of the limiting shaft (86); The switching unit (9) includes a rotating sleeve (91) installed inside the connecting shaft (82) and rotatably connected to its inner wall. The outer wall of the rotating sleeve (91) is symmetrically equipped with an arc-shaped slide rail (92), and the inner wall of the rotating sleeve (91) is symmetrically provided with an arc-shaped groove (93). The limiting shaft (86) on the steel plate frame (841) slides within the arc-shaped slide rail (92), and the limiting shaft (86) on the steel shaft (851) slides within the arc-shaped groove (93). The arc-shaped slide rail (92) includes a sliding area (921), an arc-shaped inclined area (922), and an annular area (923). The arc-shaped groove (93) includes a first arc-shaped area (931), a straight area (932), and a second arc-shaped area (933).

2. The spindle drive device for a turning machine tool according to claim 1, characterized in that: The area of ​​friction block one (84) is larger than that of friction block two (85), and a constant force spring (80) is connected between the inner wall of the hydraulic sleeve (8) and the sealing disc frame (81).

3. The spindle drive device for a turning machine tool according to claim 2, characterized in that: The connecting shaft (82) is equipped with a sliding shaft (10) that is slidably connected to its inner wall. A cavity (101) is opened at one end of the sliding shaft (10), and an annular panel (102) is fixedly installed on the sliding shaft (10). The annular panel (102) is provided with multiple through holes (103), and a spring body (104) is connected between the annular panel (102) and the inner wall of the connecting shaft (82).

4. The spindle drive device for a turning machine tool according to claim 3, characterized in that: Multiple positioning sleeves (11) are installed on the connecting shaft (82). Each positioning sleeve (11) has a positioning shaft (111) that is slidably connected to its inner wall. Both ends of the positioning shaft (111) pass through the end of the positioning sleeve (11). Both ends of the positioning shaft (111) are embedded with balls. One end of the positioning shaft (111) extends into the through hole (103). A return spring (112) is connected between the positioning shaft (111) and the inner wall of the positioning sleeve (11).

5. The spindle drive device for a turning machine tool according to claim 4, characterized in that: The hydraulic sleeve (8) has a cavity (87) on its inner wall, and the cross-section of the cavity (87) is a right trapezoid.

6. The spindle drive device for a turning machine tool according to claim 3, characterized in that: The outer wall of the sliding shaft (10) is provided with a spiral groove (105), and a plurality of ball parts (94) are installed inside the rotating sleeve (91), and the ball parts (94) slide within the spiral groove (105).

7. The spindle drive device for a turning machine tool according to claim 1, characterized in that: Both friction block one (84) and friction block two (85) are equipped with guide shafts (88) that are slidably connected to the bracket (83), and a spring mechanism (89) is connected between the guide shaft (88) and the side wall of the bracket (83).

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