Five-axis machining machine tool rotary table driving device

Abstract

The present application relates to the technical field of five-axis machine tools, and particularly relates to a five-axis machine tool rotary table driving device, which comprises a rotary table, a sliding seat and a bed body, the rotary table is rotationally connected to the sliding seat along a vertical rotary axis, the sliding seat is slidingly connected to the bed body along an X-axis direction, and the device is characterized in that it further comprises a reading component and a driving component, and the beneficial effects are that the device improves the detection accuracy, driving accuracy and driving stability of the linear driving device through the precise alignment of the reading head assembly reference point and the rotary center, and the cooperative matching of the rigid locking and thermal elongation self-adaptive release function realized by the screw end clamp, and further improves the adaptability of the linear driving device to high-precision requirement use scenarios, such as the high-precision machining requirements in high-end manufacturing fields such as aerospace and mold manufacturing.

Description

Technical Field

[0001] This invention relates to the technical field of five-axis machine tools, and more particularly to a rotary table drive device for a five-axis machining center. Background Technology

[0002] In the field of five-axis CNC machine tools, the rotary table, as a functional component that realizes rotary coordinate motion, rotates along the vertical axis of rotation and is connected to the slide. The slide is slidably connected to the machine tool along the X-axis. The driving and positioning accuracy of the rotary table's linear axes directly determines the overall machining performance of the machine. With the increasingly stringent requirements for the efficiency and quality of machining complex curved surface parts in industries such as aerospace, mold manufacturing, and precision medical devices, machine tools not only need to have higher feed rates and accelerations, but also face almost demanding requirements for accuracy and stability during long-term operation.

[0003] Traditional large five-axis machining centers typically use a motor-driven, ball screw-driven system for the linear motion axes of their rotary tables, and achieve full closed-loop control through linear feedback elements such as linear scales.

[0004] However, in practical engineering applications, existing technical solutions generally face the following problems:

[0005] Firstly, there is the issue of setting the measurement reference. In traditional structures, the grating ruler and reading head used to detect the position of the linear axis are usually mounted on the side of the slide or other convenient locations, resulting in a spatial offset between the measurement reference point of the reading head and the rotation center of the rotary table. When the machine tool operates for extended periods in complex machining environments, motor heat, cutting heat, and ambient temperature fluctuations cause uneven thermal deformation of components such as the machine tool, slide, and leadscrew. This leads to a drift in the basic coordinates for calculating the Rotating Tool Center Point (RTCP), severely affecting the contour accuracy of the five-axis linkage under thermal conditions. Although some high-end models employ material or symmetrical structural designs to suppress thermal effects, they cannot fundamentally eliminate the measurement distortion problem caused by reference point offset.

[0006] Secondly, there is the contradiction between thermal expansion and rigidity in the lead screw drive system. The frictional heat generated by the lead screw during operation has nowhere to be released, and the axial thermal expansion is completely restricted, which in turn is transformed into huge internal compressive stress. This can easily cause the lead screw to bend and deform, which not only deteriorates the transmission smoothness, but also accelerates the wear of bearings and lead screw pairs. Summary of the Invention

[0007] The technical problem to be solved:

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a five-axis machining center rotary table drive device, which solves the technical problem in the prior art that it is impossible to effectively relieve the thermal stress of the lead screw while ensuring high transmission rigidity, and at the same time fundamentally eliminate the interference of temperature changes on the coordinate measurement reference, so as to realize the accuracy self-maintaining of the linear drive unit under hot conditions.

[0009] Technical solution:

[0010] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0011] In a first aspect, the present invention provides a rotary table drive device for a five-axis machining center, comprising a rotary table, a slide block that slides along the X-axis direction, and a bed, characterized in that it further comprises a reading component and a drive component.

[0012] The reading assembly includes a reading head assembly fixedly connected to the slide and a grating ruler fixedly connected to the bed. The reading reference point of the reading head assembly coincides with the vertical rotation axis of the turntable.

[0013] The drive assembly includes a lead screw, a slider, and a clamp extending along the X-axis. The slider is threaded onto the lead screw and fixedly connected to the slide block. The first end of the lead screw is rotatably connected to the bed and fixed in axial position relative to the bed. The second end of the lead screw is rotatably connected to the bed via the clamp.

[0014] The clamp can switch between a locked state and a released state. In the locked state, the clamp fixes the second end of the leadscrew in axial position relative to the bed. In the released state, the clamp allows the second end of the leadscrew to slide axially relative to the bed.

[0015] In one embodiment of the present invention, an auxiliary installation component is also included, which includes a linear guide rail and a positioning block. The reading head assembly includes a reading body and a mounting block that are fixedly connected to each other.

[0016] Both the linear guide and the positioning block are fixedly connected to the slide, with the positioning block located at one end of the linear guide.

[0017] The mounting block can be guided by the linear guide along the X-axis to slide until it abuts against the positioning block and can be fixedly connected to the positioning block. When the mounting block and the positioning block are fixedly connected, the reading reference point of the reading head assembly coincides with the vertical rotation axis of the turntable.

[0018] In one embodiment of the present invention, a bearing is also included, which is adapted to rotatably connect the clamp and the bed.

[0019] The inner ring of the bearing is fixedly connected to the second end of the lead screw.

[0020] The clamping device includes a locking seat, a bearing positioning sleeve, and a clamping sleeve.

[0021] The locking seat is fixedly connected to the bed, and the bearing positioning sleeve is fitted onto the inner ring of the locking seat via the clamping sleeve. The bearing positioning sleeve is fixedly connected to the outer ring of the bearing, and the clamping sleeve can slide axially relative to the bearing positioning sleeve.

[0022] The clamping sleeve can radially elastically deform to grip the bearing positioning sleeve, and after the deformation reaches a first threshold, it can lock the axial position between the bearing positioning sleeve and the clamping sleeve, thereby locking the axial position between the locking seat and the bearing positioning sleeve, so that the clamp enters the locked state. The clamping sleeve can radially elastically deform to release the bearing positioning sleeve, and after the deformation reaches a second threshold, it can release the axial position between the bearing positioning sleeve and the clamping sleeve, thereby releasing the axial position between the locking seat and the bearing positioning sleeve, so that the clamp enters the released state.

[0023] In one technical solution of the present invention, a medium inlet is provided on the locking seat, and a medium cavity that is closed and communicates with the medium inlet is formed between the clamping sleeve and the inner wall of the locking seat.

[0024] In one embodiment of the present invention, the clamp further includes an intermediate sleeve, which is located between the clamping sleeve and the bearing positioning sleeve.

[0025] In the loosened state, the intermediate sleeve and the bearing positioning sleeve slide together axially.

[0026] In the locked state, the clamping sleeve can compress the bearing positioning sleeve by radially pressing the intermediate sleeve, thereby locking the axial position between the locking seat and the bearing positioning sleeve.

[0027] In one technical solution of the present invention, an annular groove is provided on the intermediate sleeve, and a clamping sleeve is disposed in the annular groove to limit the axial position of the clamping sleeve relative to the intermediate sleeve.

[0028] In one technical solution of the present invention, a positioning flange is formed on the side of the intermediate sleeve near the lead screw. The positioning flange can abut against the locking seat to limit the position of the intermediate sleeve relative to the locking seat when the intermediate sleeve slides as the lead screw extends axially.

[0029] In one technical solution of the present invention, a pressure sensor is also included, which is disposed between the positioning flange and the locking seat to measure the axial pressure of the positioning flange on the locking seat, thereby reflecting the axial force generated on the locking seat after the lead screw is thermally deformed and extended.

[0030] When the pressure sensor's measurement reaches the threshold, the clamp switches to or remains in the disengaged state.

[0031] When the pressure sensor's measurement result does not reach the threshold, the clamp switches to or remains locked.

[0032] In one technical solution of the present invention, a temperature sensor is also included, which is suitable for measuring a first temperature value of the heat-sensitive part of the lead screw and a second temperature value of the bed temperature.

[0033] When the difference between the first temperature value and the second temperature value reaches a threshold, the clamp switches to or remains in a disengaged state.

[0034] When the difference between the first temperature value and the second temperature value does not reach the threshold, the clamp switches to or remains in the locked state.

[0035] In one technical solution of the present invention, the heat-sensitive part of the lead screw is the connection between the lead screw and the slider, and there are two sets of temperature sensors. One set is fixedly connected to the bed to measure the temperature of the bed, and the other set is fixedly connected to the slider to measure the temperature of the lead screw at the corresponding position of the slider.

[0036] Beneficial effects:

[0037] The beneficial effects of this invention are as follows: The five-axis machining center rotary table drive device of this invention, firstly, because the reading reference point of the reading head assembly is nearly perfectly aligned with the vertical rotation axis of the rotary table, the impact of thermal deformation on the coordinate measurement reference is minimized when temperature changes in the working environment of the machine bed cause thermal deformation of various components. This fundamentally eliminates measurement and positioning deviations caused by thermal drift, making the coordinate data relied upon for calculating the center point of the rotating tool (RTCP) more accurate and reliable, thereby significantly improving the accuracy and stability of the machine bed during long-term operation.

[0038] Secondly, the clamp design in the drive assembly solves the problem of balancing precision and thermal deformation, which is difficult to achieve in traditional solutions. During normal machining, the clamp is in a locked state, providing high-rigidity axial restraint for the leadscrew and meeting the stringent requirements of high-speed, high-precision machining for the rigidity of the transmission system. When the leadscrew experiences temperature rise and axial thermal expansion due to high-speed operation, the clamp can switch to or remain in a released state, allowing the second end of the leadscrew to extend. This effectively releases thermal stress and prevents leadscrew bending deformation caused by obstructed thermal expansion. This not only ensures the long-term stability of the transmission system but also significantly extends the service life of the leadscrew and support bearings.

[0039] In summary, this device improves the detection accuracy, driving accuracy, and driving stability of the linear drive by precisely aligning the reference point of the reading head assembly with the rotation center, and by coordinating the rigid locking and thermal expansion adaptive release functions achieved by the screw end clamp. This, in turn, enhances the adaptability of the linear drive to high-precision application scenarios, such as the high-precision machining needs of high-end manufacturing fields like aerospace and mold manufacturing. Attached Figure Description

[0040] Figure 1This is a schematic diagram of the structure of the five-axis machining center rotary table drive device of the present invention;

[0041] Figure 2 This is one of the bottom view structural schematic diagrams of the slide position of the present invention;

[0042] Figure 3 This is a second bottom view of the slide position of the present invention;

[0043] Figure 4 This is a schematic diagram showing the combination of the structure and control system of the five-axis machining center rotary table drive device of the present invention;

[0044] Figure 5 For the present invention Figure 4 A partially enlarged structural diagram of the drive component.

[0045] Explanation of reference numerals in the attached figures:

[0046] 100: Vertical axis of rotation;

[0047] 200: Reading reference point;

[0048] 1: Turntable;

[0049] 2: Slide;

[0050] 3: Bed frame;

[0051] 4: Reading unit;

[0052] 41: Reading head assembly; 411: Mounting block;

[0053] 42: Grating ruler;

[0054] 5: Driver components;

[0055] 51: Lead screw; 52: Slider;

[0056] 53: Clamping device;

[0057] 531: Locking seat; 5310: Medium inlet; 5311: Medium cavity; 532: Bearing positioning sleeve; 533: Clamping sleeve; 534: Intermediate sleeve; 5341: Positioning flange; 5342: Annular groove;

[0058] 6: Assist in installing components;

[0059] 61: Linear guide rail; 62: Positioning block;

[0060] 7: Bearings;

[0061] 8: Pressure sensor;

[0062] 9: Temperature sensor;

[0063] 10: Controller;

[0064] 11: Hydraulic system. Detailed Implementation

[0065] To better explain and facilitate understanding of this invention, the following description is provided in conjunction with the appendix. Figures 1-5 The present invention will be described in detail through specific embodiments. In this document, directional terms such as "upper" and "lower" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0066] Example 1:

[0067] Reference Figures 1-5 This invention provides a five-axis machining center rotary table drive device, including a rotary table 1, a slide 2, and a bed 3. The rotary table 1 is rotatably connected to the slide 2 along a vertical rotation axis 100, and the slide 2 is slidably connected to the bed 3 along the X-axis. The five-axis machining center rotary table drive device also includes a reading assembly 4 and a drive assembly 5. The reading assembly 4 includes a reading head assembly 41 fixedly connected to the slide 2 and a grating ruler 42 fixedly connected to the bed 3. The reading head assembly 41 can cooperate with the grating ruler 42 to read the position of the slide 2 in the X-direction. The reading head assembly 41 is fixedly connected to the bottom of the slide 2. Since the reading head assembly 41 slides with the slide 2 along the X-axis, the reading head assembly 41 and the grating ruler 42 form a sliding fit along the X-axis, and the reading reference point 200 of the reading head assembly 41 coincides with the vertical rotation axis 100 of the rotary table 1. The drive assembly 5 includes a lead screw 51, a slider 52, and a clamp 53. The slider 52 is threaded onto the lead screw 51 along the X-axis and fixedly connected to the slide block 2. The first end of the lead screw 51 is rotatably connected to the bed 3 and fixed in position relative to the bed 3 along the X-axis. The second end of the lead screw 51 is rotatably connected to the bed 3 via the clamp 53. The lead screw 51 extends along the X-axis. The clamp 53 can switch between a locked state and a released state. In the locked state, the clamp 53 fixes the second end of the lead screw 51 in position relative to the bed 3 along the X-axis. In the released state, the clamp 53 allows the second end of the lead screw 51 to slide relative to the bed 3 along the X-axis.

[0068] The first end of the lead screw 51 is the fixed end, meaning that this end is fixed in axial position relative to the lead screw 51 itself. The second end of the lead screw 51 is the floating end, meaning that this end can change its axial position due to thermal deformation of the lead screw 51.

[0069] In this embodiment, firstly, since the reading head assembly 41 and the rotary table 1 are simultaneously mounted on the slide 2, and the reading reference point 200 of the reading head assembly 41 coincides with the vertical rotation axis 100 of the rotary table 1, when the temperature of the working environment of the bed 3 changes, causing thermal deformation of various components, the impact of this thermal deformation on the coordinate measurement reference is minimized. This fundamentally eliminates the measurement and positioning deviation caused by thermal drift, making the coordinate data relied upon for calculating the center point of the rotating tool, i.e., RTCP, more accurate and reliable, thereby significantly improving the accuracy and stability of the bed 3 during long-term operation.

[0070] Secondly, the clamp 53 design in the drive assembly 5 solves the problem of balancing precision and thermal deformation, which is difficult to achieve in traditional solutions. During normal machining, the clamp 53 is in a locked state, providing high-rigidity limit along the X-axis for the lead screw 51, meeting the stringent requirements of high-speed, high-precision machining for the rigidity of the transmission system. When the lead screw 51 experiences temperature rise and axial thermal expansion due to high-speed operation, the clamp 53 can switch to or remain in a released state, allowing the second end of the lead screw 51 to extend along the X-axis, thereby effectively releasing thermal stress and preventing bending deformation of the lead screw 51 caused by the obstruction of thermal expansion. At the same time, the clamp 53 only allows axial extension and contraction of the lead screw 51, which not only ensures the long-term stability of the transmission system but also significantly extends the service life of the lead screw 51 and the support bearing 7.

[0071] In summary, the device improves the detection accuracy, driving accuracy, and driving stability of the linear drive device through the precise alignment of the reference point of the reading head assembly 41 with the rotation center, and the coordinated function of the rigid locking and thermal expansion adaptive release achieved by the end clamp 53 of the lead screw 51. This, in turn, enhances the adaptability of the linear drive device to high-precision application scenarios, such as the high-precision machining needs of high-end manufacturing fields like aerospace and mold manufacturing.

[0072] Example 2:

[0073] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 1 described above, Embodiment 2 of the present invention further possesses the following technical solutions:

[0074] The five-axis machining center rotary table drive also includes an auxiliary mounting component 6, which includes a linear guide rail 61 and a positioning block 62. The reading head assembly 41 includes a reading body and a mounting block 411 that are fixedly connected to each other.

[0075] The linear guide rail 61 is fixedly connected to the slide 2 and extends along the X-axis. The positioning block 62 is fixedly connected to the slide 2 and is located at one end of the linear guide rail 61. Of course, in other embodiments, the positioning block 62 can also be fixed to the linear guide rail 61 to indirectly achieve fixation to the slide 2.

[0076] Mounting block 411 can slide along linear guide rail 61 in the X-axis direction and slide along linear guide rail 61 towards positioning block 62 on one side of slide 2, so that positioning block 62 restricts the sliding position of mounting block 411. Mounting block 411 can also be fixedly connected to positioning block 62, so that reading head assembly 41 is fixed to slide 2, and the reading reference point 200 of reading head assembly 41 coincides with the vertical rotation axis 100 of turntable 1. Since the position of rotation axis of turntable 1 often remains unchanged after heat deformation, the detection accuracy of reading head assembly 41 is improved after reading reference point 200 of reading head assembly 41 coincides with vertical rotation axis 100 of turntable 1.

[0077] The mounting structure of the reading head assembly 41, which uses a combination of linear guide rail 61 and positioning block 62 for positioning, allows the mounting block 411 to be pushed in by the linear guide rail 61. This enables the mounting block 411 to be mechanically positioned and fixedly connected with the positioning block 62, achieving the alignment of the measuring reference point of the reading head assembly 41 with the rotation center axis of the rotary table. This forms an integrated rigid mounting structure that precisely aligns the reading head assembly 41 with the rotation center, solving the problems of centering and reference unification in confined spaces and improving assembly efficiency.

[0078] In this embodiment, both the linear guide rail 61 and the positioning block 62 are fixedly mounted on the slide block 2, and the positioning block 62 is located exactly at one end of the linear guide rail 61 along the X-axis direction. Both can be set on the slide block 2 before assembly. For example, during the machining of the slide block 2, a mounting groove for the positioning block 62 can be opened at the bottom of the slide block 2 to achieve precise installation of the positioning block 62 and to define the position of the positioning block 62. After the position of the positioning block 62 is fixed, the positions of the mounting block 411 and the reading body can be determined, thereby ensuring that the measuring reference point of the reading head assembly 41 coincides with the rotation center axis of the turntable 1. Then, the end of the previous guide rail is precisely abutted against the positioning block 62. After the two abut, the extension direction of the previous guide rail is the X-axis direction. This ensures that the positioning block 62 can precisely abut against the positioning block 62 after sliding along the previous guide rail to the positioning block 62 position. Furthermore, a groove for abutting the linear guide rail 61 can also be opened on the positioning block 62 to achieve the positioning of the linear guide rail 61.

[0079] Mounting block 411 can move along linear guide rail 61 from the side of slide 2 towards the position of positioning block 62. When mounting block 411 slides to contact positioning block 62, positioning block 62 restricts further sliding of mounting block 411, thus providing it with a precise mechanical positioning reference. Subsequently, mounting block 411 can be fixedly connected to positioning block 62 while maintaining contact with it. Mounting block 411 is part of reading head assembly 41. Once mounting block 411 has completed contact and fixation with positioning block 62, the reading reference point 200 of reading head assembly 41 can accurately coincide with the vertical rotation axis 100 of turntable 1.

[0080] This auxiliary installation component 6, which combines the guiding of the linear guide rail 61 and the limiting of the positioning block 62, brings convenience and accuracy assurance to the assembly of the reading head assembly 41. During the assembly process, the operator only needs to push the pre-installed and adjusted reading head assembly 41 along the linear guide rail 61 until it naturally abuts against the positioning block 62, thus completing the precise alignment of the measuring reference point of the reading head assembly 41 with the rotation center axis of the rotary table. Since the measurement and adjustment of the reading head assembly 41 can be performed outside the slide 2, the convenience of adjustment is guaranteed, effectively solving the problem of difficulty in performing accurate measurements and benchmark unification in the confined space inside the machine bed 3. At the same time, since the mounting block 411 and the slide 2 form a stable rigid connection through the linear guide rail 61 and the positioning block 62, the positional stability of the reading head assembly 41 is ensured during long-term operation, preventing it from shifting due to vibration or slight collisions. This solidifies the feature of the reading reference point 200 coinciding with the rotation axis into the mechanical structure, further improving the assembly efficiency and long-term accuracy retention of the entire machine.

[0081] Example 3:

[0082] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 2 described above, Embodiment 3 of the present invention further possesses the following technical solutions:

[0083] The rotary table drive of the five-axis machining center also includes bearings 7, which are adapted to rotatably connect clamp 53 and bed 3.

[0084] The inner ring of bearing 7 is fixedly connected to the second end of lead screw 51.

[0085] The clamp 53 includes a locking seat 531, a bearing positioning sleeve 532, and a clamping sleeve 533.

[0086] The locking seat 531 is fixedly connected to the bed 3, and the bearing positioning sleeve 532 is fitted on the inner ring of the locking seat 531 and fixedly connected to the outer ring of the bearing 7.

[0087] The clamping sleeve 533 is sleeved between the bearing positioning sleeve 532 and the locking seat 531, and the clamping sleeve 533 can slide axially relative to the bearing positioning sleeve 532.

[0088] The clamping sleeve 533 is capable of radial elastic deformation to grip the bearing positioning sleeve 532, and after the deformation reaches a first threshold, it locks the axial position between the bearing positioning sleeve 532 and the clamping sleeve 533, thereby locking the axial position between the locking seat 531 and the bearing positioning sleeve 532, so that the clamp 53 enters the locked state. The clamping sleeve 533 is also capable of radial elastic deformation to release the bearing positioning sleeve 532, and after the deformation reaches a second threshold, it unlocks the axial position between the bearing positioning sleeve 532 and the clamping sleeve 533, thereby unlocking the axial position between the locking seat 531 and the bearing positioning sleeve 532, so that the clamp 53 enters the released state.

[0089] The second end of the lead screw 51 is connected to the bed 3 through a bearing device that can bear axial force and has a certain cantilever support capacity, which will not be described in detail here.

[0090] The lead screw 51 is fixedly connected to the inner ring of the bearing, and the outer ring of the bearing is fixedly connected to the bearing locating sleeve 532. Therefore, the lead screw 51 can drive the bearing locating sleeve 532 to slide axially. The bearing locating sleeve 532 and the intermediate sleeve 534 have a common hole-basis fit. When the clamp 53 is in the locked state, the gap between the solid structure of the intermediate sleeve 534 corresponding to the clamping sleeve 533 and the bearing locating sleeve 532 will decrease until the intermediate sleeve 534 locks the bearing locating sleeve 532, thereby restricting the axial position of the lead screw 51. When the clamp 53 is in the released state, the intermediate sleeve 534 and the bearing locating sleeve 532 maintain a clearance fit, which allows the lead screw 51 to slide axially.

[0091] In this embodiment, the inner ring of the bearing 7 is fixedly connected to the second end of the lead screw 51 to ensure that the lead screw 51 can rotate smoothly. The locking seat 531 serves as a base and is fixedly installed on the bed 3. The bearing positioning sleeve 532 is fitted into the inner ring of the locking seat 531 and is fixedly connected to the outer ring of the bearing 7. When the lead screw 51 slides axially, the force can be transmitted to the bearing positioning sleeve 532 through the bearing 7.

[0092] The clamping sleeve 533 itself has controllable radial elastic deformation capability. When the clamping device 53 needs to enter the locking state, an external control medium, such as hydraulic oil, is applied to the clamping sleeve 533 to cause radial elastic deformation. When the radial deformation reaches a preset first threshold, the clamping sleeve 533 will generate a huge frictional clamping force with the bearing positioning sleeve 532 inside it, thereby locking the axial position between the bearing positioning sleeve 532 and the clamping sleeve 533. Since the clamping sleeve 533 itself is axially fixed relative to the locking seat 531, when the bearing positioning sleeve 532 is locked by the clamping sleeve 533, the axial position of the bearing positioning sleeve 532 relative to the locking seat 531 is also indirectly locked. The second end of the lead screw 51 obtains axial fixed constraint, providing high rigidity support for the transmission system.

[0093] Conversely, when the clamp 53 needs to be released, the control medium is depressurized, and the clamping sleeve 533 undergoes radial elastic deformation due to its own elastic restoring force. When the deformation reaches the second threshold, the frictional clamping force between the clamping sleeve 533 and the bearing positioning sleeve 532 decreases until the axial lock between them is released. At this time, the bearing positioning sleeve 532 regains its free axial sliding ability relative to the clamping sleeve 533, and the second end of the lead screw 51 can also axially extend and retract according to temperature changes to release thermal stress.

[0094] When the medium is hydraulic oil, the first threshold and the second threshold can be directly fed back through the hydraulic pressure. That is, although the first threshold and the second threshold are the deformation of the clamping sleeve 533, what is actually measured is the pressure value of the hydraulic oil.

[0095] The clamping sleeve 533 achieves locking by directly gripping the bearing positioning sleeve 532 through radial deformation. The force transmission path is short and direct, and the locking rigidity is high. As the intermediate link connecting the bearing 7 and the clamping sleeve 533, the bearing positioning sleeve 532 not only undertakes the function of transmitting locking force, but also undertakes the function of direct or indirect sliding engagement with the clamping sleeve 533, thereby simplifying the structure.

[0096] The locking seat 531 has a medium inlet 5310, and the clamping sleeve 533 and the inner wall of the locking seat 531 form a closed medium cavity 5311 that communicates with the medium inlet 5310.

[0097] In this embodiment, the medium inlet 5310 extends to the inner wall surface of the locking seat 531. When the clamping sleeve 533 is installed between the locking seat 531 and the bearing positioning sleeve 532, a closed annular cavity is formed between the outer wall of the clamping sleeve 533 and the inner wall of the locking seat 531. This cavity communicates with the medium inlet 5310, forming the medium cavity 5311. The medium cavity 5311 is isolated from the outside world by a sealing element to ensure the effective function of the pressure medium, such as by providing a sealing ring between the clamping sleeve 533 and the locking seat 531 to ensure sealing performance.

[0098] When the hydraulic system 11 injects a pressure medium, such as hydraulic oil, into the medium cavity 5311 through the medium inlet 5310, the pressure in the medium cavity 5311 increases, and the pressure medium acts uniformly on the outer wall surface of the clamping sleeve 533. The clamping sleeve 533 adopts a thin-walled structure with elastic deformation capability. Under the action of uniform radial pressure in the circumferential direction, the clamping sleeve 533 as a whole undergoes radial contraction elastic deformation, that is, its inner diameter decreases. As the medium pressure continues to increase, the radial contraction of the clamping sleeve 533 gradually increases, and the pressure between its inner wall and the outer wall of the bearing positioning sleeve 532 increases until it reaches the first threshold, which can generate a frictional clamping force sufficient to lock the axial relative position of the two, thereby causing the clamp 53 to enter the locking state. Conversely, when the pressure medium in the medium cavity 5311 is removed and recirculated, the pressure inside the cavity decreases, and the clamping sleeve 533 expands outward radially by the elastic restoring force of its own material, restoring to its initial shape until it reaches the second threshold. The frictional clamping force between its inner wall and the bearing positioning sleeve 532 disappears, and the two return to a state where they can slide freely. The clamp 53 then switches to or remains in a detached state.

[0099] The locking and unlocking mechanism, achieved by hydraulically driving the radial elastic deformation of the clamping sleeve 533, offers advantages such as fast response, adjustable and controllable clamping force, and smooth, impact-free operation. The medium cavity 5311 employs a closed annular structure, ensuring that the pressure medium acts evenly across the entire circumference of the clamping sleeve 533. This guarantees uniform deformation of the clamping sleeve 533, preventing localized stress concentration or uneven wear, thereby improving the reliability and repeatability of the locking mechanism. By adjusting the medium pressure, the radial deformation of the clamping sleeve 533 can be precisely controlled, thus obtaining a locking force that matches the operating conditions. This ensures rigid support during heavy cutting while preventing damage to the surface of the bearing locating sleeve 532 due to excessive locking force.

[0100] Example 4:

[0101] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 3 described above, Embodiment 4 of the present invention further possesses the following technical solutions:

[0102] The clamp 53 also includes an intermediate sleeve 534, which is located between the clamping sleeve 533 and the bearing positioning sleeve 532.

[0103] In the loosened state, the intermediate sleeve 534 and the bearing positioning sleeve 532 slide axially.

[0104] In the locked state, the clamping sleeve 533 can compress the bearing positioning sleeve 532 by radially pressing the intermediate sleeve 534, thereby locking the axial position between the locking seat 531 and the bearing positioning sleeve 532.

[0105] In this embodiment, the intermediate sleeve 534 is made of a material with good elastic deformation capability. It has an overall sleeve structure and is fitted around the bearing positioning sleeve 532 and located inside the clamping sleeve 533. The end of the intermediate sleeve 534 near the lead screw 51 extends radially outward to form a positioning flange 5341. The positioning flange 5341 corresponds axially to the end face of the locking seat 531, and the two can abut against each other, thereby constraining the axial limit position of the lead screw 51 relative to the locking seat 531.

[0106] When the hydraulic system 11 injects pressurized medium into the medium cavity 5311 through the medium inlet 5310, the clamping sleeve 533 undergoes radial contraction under uniform radial pressure. The inner wall of the clamping sleeve 533 first contacts the outer wall of the intermediate sleeve 534 and applies compressive force. This compressive force is transmitted inward through the wall of the intermediate sleeve 534, causing the intermediate sleeve 534 to undergo synchronous radial contraction deformation, thereby tightly gripping the bearing positioning sleeve 532 by the inner wall of the intermediate sleeve 534. Through the elastic deformation of the intermediate sleeve 534, the locking force of the clamping sleeve 533 is more evenly applied to the entire circumferential surface of the bearing positioning sleeve 532, ultimately achieving reliable axial locking between the locking seat 531 and the bearing positioning sleeve 532. When the pressure in the medium cavity 5311 is released, the clamping sleeve 533 returns radially, and the intermediate sleeve 534 elastically returns, releasing the gripping state on the bearing positioning sleeve 532.

[0107] As an independent component, the intermediate sleeve 534 can be independently optimized in terms of material selection and wall thickness design to meet elasticity and strength requirements. This ensures good force transmission performance without imposing excessive requirements on the material selection and machining accuracy of the clamping sleeve 533, which helps to reduce manufacturing costs and improve assembly processability.

[0108] Meanwhile, the intermediate sleeve 534 can be used as a replaceable wear part. If wear occurs after long-term use, the performance of the clamp 53 can be restored by replacing the intermediate sleeve 534 alone, reducing maintenance costs and downtime. In addition, the elastic homogenizing effect of the intermediate sleeve 534 allows the clamping force to be distributed more evenly on the circumferential surface of the bearing positioning sleeve 532, avoiding local stress concentration caused by uneven deformation or machining errors of the clamping sleeve 533 itself. This effectively protects the surface accuracy of the bearing positioning sleeve 532 and the smooth operation of the bearing 7, enabling the entire clamp 53 to maintain reliable performance and a long service life even in frequent locking and unlocking actions.

[0109] Example 5:

[0110] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 4 described above, Embodiment 5 of the present invention further includes the following technical solutions:

[0111] An annular groove 5342 is provided on the intermediate sleeve 534, and a clamping sleeve 533 is disposed in the annular groove 5342 to limit the axial position of the clamping sleeve 533 relative to the intermediate sleeve 534.

[0112] In this embodiment, by means of embedded installation, the two side walls of the annular groove 5342 form an axial constraint on the clamping sleeve 533, so that the axial position of the clamping sleeve 533 relative to the intermediate sleeve 534 can be fixed, and no longer depends on other external limiting elements.

[0113] Specifically, the intermediate sleeve 534 can be configured as a split structure, which includes a reading body and a connecting ring. The reading body is in the form of a step, and the connecting ring is sleeved on the smaller section of the reading body. The two can be detachably connected, specifically by screws. After the connecting ring and the reading body are connected, an annular groove 5342 is formed between the step position and the axial side of the connecting ring and the outer wall of the reading body.

[0114] When the clamping sleeve 533 contracts or expands radially, the interaction force between it and the intermediate sleeve 534 is mainly concentrated in the radial direction, while the axial direction is reliably limited by the groove wall of the annular groove 5342, ensuring that the clamping sleeve 533 will not move axially due to vibration, impact or frequent deformation during operation, thereby ensuring the consistency of the axial alignment accuracy between the clamping sleeve 533 and the intermediate sleeve 534 during each locking action, and keeping the position of the locking force application stable at all times.

[0115] The embedded structure makes the entire clamp 53 more compact in the axial direction, which helps to arrange it inside the space-constrained bed 3.

[0116] In addition, the clamping sleeve 533 and the intermediate sleeve 534 form a relatively fixed axial fit relationship through the annular groove 5342. During the assembly process, the clamping sleeve 533 only needs to be aligned with the annular groove 5342 and inserted to obtain the correct axial position naturally. No additional measurement and adjustment are required, which significantly improves assembly efficiency and repeatability.

[0117] Example 6:

[0118] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 5 described above, Embodiment 6 of the present invention further possesses the following technical solutions:

[0119] A positioning flange 5341 is formed on the side of the intermediate sleeve 534 near the lead screw 51. The positioning flange 5341 can abut against the locking seat 531 to limit the position of the intermediate sleeve 534 relative to the locking seat 531 when it slides as the lead screw 51 extends axially.

[0120] The end faces of the positioning flange 5341 and the locking seat 531 are axially aligned. In the locked state, when the lead screw 51 undergoes axial thermal expansion due to temperature rise, the bearing positioning sleeve 532, which is fixedly connected to the second end of the lead screw 51, will move axially due to the thermal expansion. This movement, in turn, will cause the intermediate sleeve 534 to slide along with the bearing positioning sleeve 532 through the engagement between the intermediate sleeve 534 and the bearing positioning sleeve 532. When the intermediate sleeve 534 slides to a certain extent in the expansion direction along with the lead screw 51, the positioning flange 5341 at its end abuts against the corresponding end face of the locking seat 531, thus forming a mechanical limit and preventing the intermediate sleeve 534 and its associated bearing positioning sleeve 532 from continuing to displace in that direction, thereby improving the reliability of the clamp 53.

[0121] It also includes a pressure sensor 8, located between the positioning flange 5341 and the locking seat 531, to measure the axial pressure of the positioning flange 5341 on the locking seat 531, thereby reflecting the axial force generated by the thermal deformation and elongation of the lead screw 51 on the locking seat 531. When the measurement result of the pressure sensor 8 reaches the threshold, the clamp 53 switches to or remains in the disengaged state.

[0122] When the measurement result of pressure sensor 8 does not reach the threshold, clamp 53 switches to or remains in the locked state.

[0123] Pressure sensor 8 is used to measure the axial pressure between the positioning flange 5341 and the locking seat 531 in real time. When the lead screw 51 undergoes axial thermal expansion due to temperature rise, the thermal expansion movement drives the bearing positioning sleeve 532 and the intermediate sleeve 534 to slide in the expansion direction, and the positioning flange 5341 subsequently approaches the locking seat 531. If the thermal expansion of the lead screw 51 is within the design allowable range, the measurement value of pressure sensor 8 will also be within the allowable range. When the thermal expansion exceeds the threshold range, the measurement value detected by pressure sensor 8 will also exceed the allowable range, that is, the pressure value directly reflects the magnitude of the axial force generated by the thermal deformation and extension of the lead screw 51 on the locking seat 531.

[0124] The measurement results from pressure sensor 8 are transmitted to controller 10 in real time, serving as the basis for determining the state switching of clamp 53. Controller 10 has a preset pressure threshold, which is set based on factors such as the load-bearing capacity of lead screw 51 and bearing 7, and the normal operating temperature range of the machine bed 3. When the measurement result from pressure sensor 8 reaches or exceeds this threshold, continuing to maintain the locked state may cause lead screw 51 to bend and deform, bearing 7 to be damaged, or other structural damage, reducing the driving accuracy of the drive device. At this time, controller 10 automatically issues a command to switch clamp 53 to or maintain the loosened state, releasing the clamping sleeve 533 from the bearing positioning sleeve 532, allowing axial sliding of the second end of lead screw 51, thereby promptly eliminating excessive thermal stress. Conversely, when the measurement result from pressure sensor 8 does not reach the threshold, it indicates that the thermal expansion of lead screw 51 is within a controllable range, or that thermal stress has been released through the previous loosening action. Controller 10 then commands clamp 53 to switch to or maintain the locked state, restoring axial fixation of the second end of lead screw 51, ensuring that the transmission system has sufficient rigidity to meet machining requirements.

[0125] First, this technical solution enables real-time monitoring and active response to the thermal deformation state of the lead screw 51, making the locking and unlocking of the clamp 53 no longer a simple timed or preset program control, but a dynamic adaptive adjustment based on actual working conditions. When the machine bed 3 is in a cold state or the temperature is stable, the clamp 53 remains locked, providing high rigidity support. When the temperature rises and thermal stress accumulates to a critical value, the system automatically releases the stress. After the stress is released, the system can automatically re-lock, ensuring the rigidity requirements during the machining process and avoiding accuracy loss or structural damage caused by thermal stress accumulation. Second, the setting of the pressure threshold provides a clear safety protection boundary for the lead screw 51 and bearing 7. When abnormal working conditions cause a sharp increase in axial force, the system can respond quickly and release in time, playing an active protection role and significantly improving the operational safety of the equipment. In addition, the measurement data of the pressure sensor 8 can also serve as important reference information for thermal error compensation of the machine bed 3. The controller 10 can correct the coordinate position in real time based on the measured thermal stress change trend, further improving machining accuracy.

[0126] Example 7:

[0127] Reference Figures 1-5 In addition to possessing all the technical solutions of Embodiment 6 described above, Embodiment 7 of the present invention further includes the following technical solutions:

[0128] It also includes a temperature sensor 9, which is suitable for measuring the first temperature value of the heat-sensitive part of the lead screw 51 and the second temperature value of the bed 3.

[0129] When the difference between the first temperature value and the second temperature value reaches a threshold, the clamp 53 switches to or remains in a disengaged state.

[0130] When the difference between the first temperature value and the second temperature value does not reach the threshold, the clamp 53 switches to or remains in the locked state.

[0131] The heat-sensitive part of the lead screw 51 is the connection between the lead screw 51 and the slider 52. There are two sets of temperature sensors 9. One set is fixedly connected to the bed 3 to measure the temperature of the bed 3, and the other set is fixedly connected to the slider 52 to measure the temperature of the lead screw 51 at the corresponding position of the slider 52.

[0132] This temperature-feedback-based control method for the clamp 53 can coexist with the aforementioned control method for the clamp 53 based on the pressure value feedback measured by the pressure sensor 8.

[0133] In this embodiment, the heat-sensitive part of the lead screw 51 specifically refers to the area where the lead screw 51 and the slider 52 interact. Due to rolling friction and preload, this area is usually where the lead screw 51 generates the most concentrated heat and experiences the most significant temperature rise. Therefore, two sets of temperature sensors 9 are configured: one set is fixedly installed on the bed 3 to measure the second temperature value of the bed 3, which reflects the thermal equilibrium state of the bed 3's basic structure. The other set is fixedly installed on the slider 52 and moves with it to measure the first temperature value of the lead screw 51 at the location of the slider 52 in real time, which directly reflects the degree of heat generated by the lead screw 51 during operation.

[0134] The measurement results from the two sets of temperature sensors 9 are transmitted in real time to the control system of the bed 3. The control system calculates the difference between the first and second temperature values, which directly represents the thermal expansion trend of the lead screw 51 relative to the bed 3. A temperature difference threshold is preset within the control system. This threshold is based on a combination of parameters, including the linear expansion coefficient of the lead screw 51 material, the effective working length of the lead screw 51, the bearing clearance 7, and the normal operating temperature range of the bed 3. When the difference between the first and second temperature values ​​reaches or exceeds this preset threshold, it means that the thermal elongation of the lead screw 51 has reached a critical value that may affect transmission accuracy or structural safety. At this time, the control system automatically issues a command to switch the clamp 53 to or keep it in a disengaged state, releasing the clamping sleeve 533 from the bearing positioning sleeve 532, allowing the second end of the lead screw 51 to slide freely axially, thereby eliminating thermal stress before it accumulates to a dangerous level. Conversely, when the temperature difference does not reach the threshold, it indicates that the thermal state of the lead screw 51 is within a safe range. The control system then instructs the clamp 53 to switch to or remain in the locked state to ensure that the transmission system has sufficient rigidity to meet the processing requirements.

[0135] Since the controller 10 controls based on the temperature difference between the two temperature sensors 9, when the temperature of the lead screw 51 is high, the temperature of the bed 3 will also be high due to heat conduction. Both the bed 3 and the lead screw will undergo thermal expansion. Within the allowable range of temperature difference, the thermal expansion of the two can cancel each other out.

[0136] After the thermal stress of the lead screw 51 is released, its temperature will decrease until the temperature difference measured by the two temperature sensors 9 enters the allowable range. At this time, the clamp 53 will switch back to or remain in the locked state.

[0137] The temperature-feedback-based clamp control method and the aforementioned pressure-feedback-based control method can exist independently or be configured in conjunction. If temperature feedback control is used alone, the system can actively intervene in thermal deformation by monitoring temperature differences, releasing thermal stress on the lead screw 51. If pressure feedback control is used alone, the system can directly respond to the generated axial force, releasing it promptly when the thermal stress reaches a critical value. This allows the drive unit to maintain optimal operating conditions under complex operating conditions.

[0138] It can be understood that, except for conflicting parts, the above embodiments 1-7 can be freely combined to form other embodiments of the present invention.

[0139] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0140] In this invention, unless otherwise explicitly 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 or an electrical 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 invention according to the specific circumstances.

[0141] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0142] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0143] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A rotary table drive device for a five-axis machining center, comprising a rotary table (1), a slide (2) sliding along the X-axis direction, and a bed (3), characterized in that, It also includes a reading component (4) and a drive component (5); The reading assembly (4) includes a reading head assembly (41) fixedly connected to the slide (2) and a grating ruler (42) fixedly connected to the bed (3). The reading reference point (200) of the reading head assembly (41) coincides with the vertical rotation axis (100) of the turntable (1). The drive assembly (5) includes a lead screw (51), a slider (52) and a clamp (53) extending along the X-axis. The slider (52) is threaded onto the lead screw (51) and fixedly connected to the slide block (2). The first end of the lead screw (51) is rotatably connected to the bed (3) and fixed in axial position relative to the bed (3). The second end of the lead screw (51) is rotatably connected to the bed (3) through the clamp (53). The clamp (53) can switch between a locked state and a released state; in the locked state, the clamp (53) fixes the second end of the lead screw (51) in the axial position relative to the bed (3); in the released state, the clamp (53) allows the second end of the lead screw (51) to slide axially relative to the bed (3); It also includes an auxiliary installation component (6), which includes a linear guide (61) and a positioning block (62), and a reading head assembly (41) which includes a reading body and a mounting block (411) that are fixedly connected to each other. The linear guide (61) and the positioning block (62) are both fixedly connected to the slide (2) and the positioning block (62) is located at one end of the linear guide (61); The mounting block (411) can be guided by the linear guide rail (61) to slide along the X-axis direction to abut against the positioning block (62) and be fixedly connected to the positioning block (62). When the mounting block (411) and the positioning block (62) are fixedly connected, the reading reference point (200) of the reading head assembly (41) coincides with the vertical rotation axis (100) of the turntable (1).

2. The five-axis machining center rotary table drive device as described in claim 1, characterized in that, It also includes a bearing (7) adapted to rotate the connecting clamp (53) and the bed (3); The inner ring of the bearing (7) is fixedly connected to the second end of the lead screw (51); The clamp (53) includes a locking seat (531), a bearing positioning sleeve (532), and a clamping sleeve (533). The locking seat (531) is fixedly connected to the bed (3). The bearing positioning sleeve (532) is sleeved on the inner ring of the locking seat (531) via the clamping sleeve (533). The bearing positioning sleeve (532) is fixedly connected to the outer ring of the bearing (7). The clamping sleeve (533) can slide axially relative to the bearing positioning sleeve (532). The clamping sleeve (533) can be radially elastically deformed to clamp the bearing positioning sleeve (532), and can lock the axial position between the bearing positioning sleeve (532) and the clamping sleeve (533) after the deformation reaches the first threshold, thereby locking the axial position between the locking seat (531) and the bearing positioning sleeve (532) so that the clamp (53) enters the locking state; the clamping sleeve (533) can be radially elastically deformed to loosen the bearing positioning sleeve (532), and can release the axial position between the bearing positioning sleeve (532) and the clamping sleeve (533) after the deformation reaches the second threshold, thereby releasing the axial position between the locking seat (531) and the bearing positioning sleeve (532) so that the clamp (53) enters the loosening state.

3. The five-axis machining center rotary table drive device as described in claim 2, characterized in that, The locking seat (531) has a medium inlet (5310), and a medium cavity (5311) is formed between the clamping sleeve (533) and the inner wall of the locking seat (531) and is connected to the medium inlet (5310).

4. The five-axis machining center rotary table drive device as described in claim 3, characterized in that, The clamp (53) also includes an intermediate sleeve (534) located between the clamping sleeve (533) and the bearing positioning sleeve (532); In the loosened state, the intermediate sleeve (534) and the bearing positioning sleeve (532) slide axially; In the locked state, the clamping sleeve (533) can compress the bearing positioning sleeve (532) by radially pressing the intermediate sleeve (534), thereby locking the axial position between the locking seat (531) and the bearing positioning sleeve (532).

5. The five-axis machining center rotary table drive device as described in claim 4, characterized in that, An annular groove (5342) is provided on the intermediate sleeve (534), and a clamping sleeve (533) is provided in the annular groove (5342) to limit the axial position of the clamping sleeve (533) relative to the intermediate sleeve (534).

6. The five-axis machining center rotary table drive device as described in claim 4, characterized in that, A positioning flange (5341) is formed on the side of the intermediate sleeve (534) near the lead screw (51). The positioning flange (5341) can abut against the locking seat (531) to limit the position of the intermediate sleeve (534) relative to the locking seat (531) when the intermediate sleeve (534) slides as the lead screw (51) extends axially.

7. The five-axis machining center rotary table drive device as described in claim 6, characterized in that, It also includes a pressure sensor (8), which is suitable for being placed between the positioning flange (5341) and the locking seat (531) to measure the axial pressure of the positioning flange (5341) on the locking seat (531), thereby reflecting the axial force generated by the lead screw (51) on the locking seat (531) after thermal deformation and extension; When the measurement result of the pressure sensor (8) reaches the threshold, the clamp (53) switches to or remains in the disengaged state; When the measurement result of the pressure sensor (8) does not reach the threshold, the clamp (53) switches to or remains in the locked state.

8. The five-axis machining center rotary table drive device as described in claim 4 or 6, characterized in that, It also includes a temperature sensor (9), which is suitable for measuring the first temperature value of the heat-sensitive part of the lead screw (51) and the second temperature value of the bed (3); When the difference between the first temperature value and the second temperature value reaches the threshold, the clamp (53) switches to or remains in the detached state; When the difference between the first temperature value and the second temperature value does not reach the threshold, the clamp (53) switches to or remains in the locked state.

9. The five-axis machining center rotary table drive device as described in claim 8, characterized in that, The heat-sensitive part of the lead screw (51) is the connection between the lead screw (51) and the slider (52). There are two sets of temperature sensors (9). One set is fixedly connected to the bed (3) to measure the temperature of the bed (3), and the other set is fixedly connected to the slider (52) to measure the temperature of the lead screw (51) at the corresponding position of the slider (52).

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