Thermal error testing device for machine tool

Abstract

The invention relates to the technical field of machine tool spindle thermal error measurement, and discloses a machine tool thermal error testing device which comprises a base assembly, a lifting adjusting structure, a main lifting rod, an auxiliary rod and a sensor mounting assembly. The lifting adjusting structure comprises a bottom column connected to the fixing plate base connecting plate, a top column connected to the fixing plate bottom column, a driving piece arranged in the fixing plate bottom column and the fixing plate top column in a penetrating mode and a lifting driving assembly coupled with the fixing plate driving piece. The main lifting rod is arranged in the fixing plate jacking column in a penetrating mode and connected with the fixing plate driving piece. The auxiliary rod is connected with the fixed plate main lifting rod; and the sensor mounting assembly is connected with the fixed plate auxiliary rod. According to the invention, reliable guarantee is provided for smooth proceeding of a thermal error test of a machine tool and accuracy of test data.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine tool spindle thermal error measurement, and in particular to a machine tool thermal error testing device. BACKGROUND

[0002] As the core moving part of the machine tool machining system, the machine tool spindle will generate thermal deformation due to bearing friction heat, motor heat, cutting heat and other heat sources during high-speed operation, and then cause thermal error. This error accounts for about 40%-70% of the total machine tool machining error, directly leading to the decline of workpiece size precision and geometric position precision, and is the key bottleneck restricting the machining quality of high-end machine tools. Therefore, accurate and comprehensive testing of machine tool spindle thermal error to obtain the thermal deformation law of the spindle under different working conditions is the premise of machine tool design optimization and error compensation algorithm development, and the rationality of the structure and the adaptability of the function of the testing device are the core basis to ensure the effectiveness of the test.

[0003] The existing testing device still has deficiencies in the height adjustment and spatial position adaptation of the sensor. On the one hand, the lifting mechanism of some devices only relies on sleeve sliding or simple lead screw to realize height adjustment, lacks dedicated guide and positioning structure, and the main lifting rod is prone to radial deflection during lifting, which cannot guarantee the stable movement of the sensor along the vertical direction, and then it is difficult to accurately align the target test point of the spindle. On the other hand, the connection between the sensor and the device body is rigidly fixed, and the test angle and horizontal position of the sensor cannot be flexibly adjusted, for example, it is difficult to quickly adjust the sensor posture according to the radial and axial thermal deformation test requirements of the spindle, which limits the test range and cannot fully cover the key thermal deformation area of the spindle, affecting the integrity and accuracy of thermal error data collection. SUMMARY

[0004] The present application provides a machine tool thermal error testing device to solve the above problems.

[0005] The present application provides a machine tool thermal error testing device, comprising: a base assembly comprising a base connecting plate; a lifting adjustment structure comprising a bottom column connected to the base connecting plate, a top column connected to the bottom column, a drive member arranged inside the bottom column and the top column, and a lifting drive assembly coupled with the drive member; a main lifting rod arranged inside the top column and connected to the drive member; a sub rod connected to the main lifting rod; a sensor mounting assembly connected to the sub rod.

[0006] The machine tool thermal error testing device works, first, the base connecting plate in the base assembly provides a stable support foundation for the whole device, ensures that the device will not appear overall shaking or displacement in the machine tool thermal error testing process; then, by operating the lifting driving assembly in the lifting adjusting structure, the driving member is coupled and driven in the internal space defined by the bottom column and the top column; since the main lifting rod is provided in the top column and directly connected with the driving member, the movement of the driving member will synchronously drive the main lifting rod to move smoothly along the axial direction of the top column, and the auxiliary rod connected with the main lifting rod will adjust the position synchronously with the movement of the main lifting rod, thereby driving the sensor mounting assembly connected with the auxiliary rod to realize accurate position adjustment, and finally enabling the sensor mounting assembly to accurately reach the target position required by the machine tool thermal error testing. From the effect, the stable support of the base connecting plate provides a stable premise for the movement of all subsequent components, avoiding test deviation caused by unstable foundation; the lifting adjusting structure limits the driving member through the bottom column and the top column, and the lifting driving assembly is coupled and driven with the driving member, which ensures the stability and accuracy of the lifting action of the main lifting rod, preventing the main lifting rod from deviating during movement; the connection of the main lifting rod and the auxiliary rod realizes effective transmission of movement, ensuring that the sensor mounting assembly can accurately move as required, providing reliable protection for the smooth progress of the machine tool thermal error testing and the accuracy of the test data.

[0007] In an alternative embodiment, the driving member is a screw rod, one end of which is movably arranged in the threaded hole at the bottom of the main lifting rod, and the other end is rotatably arranged in the bottom column.

[0008] The threaded transmission structure of the screw rod as the driving member can effectively prevent the main lifting rod from moving or jamming during movement, ensuring the stability and accuracy of height adjustment; at the same time, the rotatable support of the bottom column to the screw rod further ensures the coaxiality of the screw rod during rotation, reduces the movement deviation of the main lifting rod caused by the deflection of the screw rod, provides reliable protection for the accurate positioning of the subsequent auxiliary rod and sensor mounting assembly, and thus improves the accuracy of sensor position adjustment during machine tool thermal error testing.

[0009] In an alternative embodiment, the lifting driving assembly comprises: A first transmission gear fixed on the outer surface of the driving member; A lifting handle rotatably provided on the side wall of the bottom column, the distal end of which is provided with a second transmission gear, and the second transmission gear is engaged with the first transmission gear.

[0010] The meshing transmission of the first transmission gear and the second transmission gear can effectively ensure the stability and precision of power transmission of the lifting driving assembly, avoid the adjustment deviation caused by transmission slip, and ensure the precision of height adjustment of the main lifting rod. Meanwhile, the lifting handle is rotatably arranged on the sidewall of the base column, which provides a convenient operating position for the operator, and the adjustment can be realized without directly contacting the driving part, which is more labor-saving and convenient. In addition, the structural characteristics of the gear transmission can make the rotation speed of the driving part more stable and controllable, avoid the movement of the main lifting rod caused by the rapid or unstable rotation of the driving part, provide reliable support for the accurate arrival of the sensor mounting assembly at the test target position, and further ensure the accuracy of the machine tool thermal error test data.

[0011] In an optional embodiment, a first bearing is arranged between the driving part and the base column, and a second bearing is arranged between the driving part and the top column.

[0012] The working mode of the double-bearing cooperation can greatly reduce the mechanical friction resistance between the driving part and the base column and the top column, make the rotation of the driving part more smooth, reduce the wear of the parts to prolong the service life, and ensure the coaxiality of the driving part during rotation, effectively avoid the jamming or radial deviation of the main lifting rod during the lifting of the main lifting rod in the top column, and further ensure that the auxiliary rod connected with the main lifting rod can stably drive the sensor mounting assembly to accurately adjust the position, thereby providing reliable support for the accurate positioning of the sensor during the machine tool thermal error test and the accuracy of the test data.

[0013] In an optional embodiment, a vertical guide groove is arranged in the top column, and an adaptive sliding block is arranged on the main lifting rod and movably limited in the vertical guide groove.

[0014] This structural cooperation avoids the radial shaking or deflection of the main lifting rod during the lifting process, ensures that the main lifting rod always moves along the preset vertical direction, greatly improves the precision of height adjustment, further ensures the stability of the movement of the main lifting rod through structural limiting, thereby enabling the auxiliary rod connected with the main lifting rod to keep stable movement, and finally ensuring that the sensor mounting assembly on the auxiliary rod can accurately reach the target position of the machine tool thermal error test, thereby laying a structural foundation for the accuracy of the subsequent test data.

[0015] In an optional embodiment, the main lifting rod and the auxiliary rod are arranged in parallel. A ball hinge connecting rod is further connected between the auxiliary rod and the sensor mounting assembly, and the ball hinge connecting rod is perpendicular to the auxiliary rod. The sensor mounting assembly comprises an eddy current sensor connecting plate and a level meter mounted on the front side and the left side of the eddy current sensor connecting plate. The ball joint end of the eddy current sensor connecting plate can move in the ball joint groove of the ball joint connecting rod to adjust the horizontal position of the eddy current sensor connecting plate.

[0016] The parallel distribution of the main lifting rod and the auxiliary rod provides a stable directional reference for the movement of the auxiliary rod, preventing positional deviations when the auxiliary rod moves with the main lifting rod and ensuring the accuracy of the sensor mounting assembly's foundation movement. The ball joint connecting rod perpendicular to the auxiliary rod not only achieves stable force and motion transmission between the auxiliary rod and the sensor mounting assembly, but also provides the sensor mounting assembly with flexible angle adjustment capabilities through its own rotation function. This allows the device to adapt to a wider range of machine tool thermal error testing scenarios, while preventing the sensor mounting assembly from deviating from the test target due to excessive adjustment, further improving the accuracy and adaptability of machine tool thermal error testing.

[0017] In one optional embodiment, the machine tool thermal error testing device further includes a secondary rod connecting buckle connecting the ball joint rod and the secondary rod; the secondary rod connecting buckle has a cavity with an opening on one side and fixed plates disposed on both sides of the cavity opening, and the two fixed plates are provided with a secondary rod rotating handle, and the fixed plates are connected to the ball joint rod.

[0018] In one optional embodiment, the machine tool thermal error testing device further includes: The main rod connecting buckle has a cavity with an opening on one side and fixing plates arranged on both sides of the cavity opening, and the main lifting rod passes through the cavity; The main rod rotating handle passes through the threaded holes of the two fixed plates; A reversing connecting rod is connected between the main rod connecting buckle and the secondary rod.

[0019] The cavity of the main rod connecting buckle and its cooperation with the main rod rotating handle ensure the reliability of the connection between the main lifting rod and the main rod connecting buckle, providing a solid foundation for motion transmission. It also enables the main rod connecting buckle to be adjusted and fixed on the main lifting rod, greatly improving the installation flexibility of the device. Meanwhile, the reversing connecting rod effectively connects the main rod connecting buckle and the auxiliary rod, ensuring that the lifting motion of the main lifting rod can be accurately and synchronously transmitted to the auxiliary rod. This, in turn, ensures that the auxiliary rod drives the sensor mounting components to accurately reach the test target position, providing strong support for the accuracy and ease of operation of machine tool thermal error testing.

[0020] In one alternative embodiment, the base assembly further includes a permanent magnet, which is fixed to the bottom of the base connecting plate.

[0021] The combination of the permanent magnet and the base connecting plate eliminates the structural damage to the machine tool table caused by traditional bolt fixing, making it adaptable to machine tool tables of different specifications and structures, and greatly improving the versatility of the base assembly. On the other hand, the strong magnetic adsorption provides reliable fixing force, effectively resisting vibration during machine tool operation and preventing displacement or shaking of the base connecting plate and the entire device, laying the foundation for the stable operation of subsequent lifting adjustment structures, main lifting rods, and other components. At the same time, the magnetic fixing method makes the disassembly and repositioning of the device more convenient, eliminating the need for cumbersome bolt installation and removal operations, significantly improving the preparation efficiency before machine tool thermal error testing and the flexibility of position adjustment during testing.

[0022] In one optional embodiment, a fixing plate is provided on the side of the bottom column and the top column that abuts against each other, and threaded holes are provided on both fixing plates, with screws passing through the threaded holes. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of a machine tool thermal error testing device according to an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view of the machine tool thermal error testing device shown; Figure 3 for Figure 1 A partially enlarged schematic diagram of the bottom part of the machine tool thermal error testing device shown; Figure 4 for Figure 1 The diagram shows a partially enlarged view of the bottom part of the machine tool thermal error testing device from another direction.

[0025] Explanation of reference numerals in the attached figures: 1. Permanent magnet, powerful magnet; 2. Base assembly; 3. Bottom column; 4. Lifting handle; 5. Screws; 6. Top column; 7. Level; 8. Eddy current sensor connection board; 9. Ball joint connecting rod; 10. Sub-rod connecting buckle; 11. Secondary pole; 12. Reversing connecting rod; 13. Main lifting boom; 14. Main rod connecting buckle; 15. Main rod rotation handle; 16. Driving components; 17. Bearing No. 1; 18. Transmission gear number one; 19. Bearing No. 2; 20. Secondary lever rotation handle; 21. Lifting bearing; 22. Second transmission gear. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0027] As the core moving component of a machine tool machining system, the machine tool spindle undergoes thermal deformation during high-speed operation due to various heat sources such as bearing friction heat, motor heat, and cutting heat, leading to thermal errors. These errors account for approximately 40%-70% of the total machining error, directly causing a decrease in workpiece dimensional and positional accuracy, and are a key bottleneck restricting the machining quality of high-end machine tools. Therefore, accurate and comprehensive testing of the machine tool spindle's thermal errors to obtain the thermal deformation patterns under different operating conditions is a prerequisite for machine tool design optimization and error compensation algorithm development. The structural rationality and functional adaptability of the testing device are the core foundation for ensuring the effectiveness of the testing.

[0028] Existing testing devices still have shortcomings in terms of sensor height adjustment and spatial positioning adaptability. On the one hand, the lifting mechanism of some devices relies solely on sleeve sliding or simple lead screws for height adjustment, lacking a dedicated guiding and positioning structure. This causes the main lifting rod 13 to easily deflect radially during lifting, making it impossible to ensure stable vertical movement of the sensor and thus difficult to accurately align with the target test point on the spindle. On the other hand, the connection between the sensor and the main body of the device is mostly rigidly fixed, making it impossible to flexibly adjust the sensor's test angle and horizontal position. For example, it is difficult to quickly adjust the sensor's posture according to the radial and axial thermal deformation test requirements of the spindle, resulting in a limited test range that cannot fully cover the key thermal deformation areas of the spindle, affecting the integrity and accuracy of thermal error data acquisition.

[0029] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, a machine tool thermal error testing device is provided, including a base assembly 2, a lifting adjustment structure, a main lifting rod 13, a secondary rod 11, and a sensor mounting assembly. The base assembly 2 includes a base connecting plate; the lifting adjustment structure includes a bottom column 3 connected to the base connecting plate of the fixed plate, a top column 6 connected to the bottom column 3 of the fixed plate, a driving component 16 passing through the bottom column 3 and the top column 6 of the fixed plate, and a lifting drive assembly coupled to the driving component 16 of the fixed plate; the main lifting rod 13 passes through the top column 6 of the fixed plate and is connected to the driving component 16 of the fixed plate; the secondary rod 11 is connected to the main lifting rod 13 of the fixed plate; and the sensor mounting assembly is connected to the secondary rod 11 of the fixed plate.

[0031] When the machine tool thermal error testing device is working, the base connecting plate in the base assembly 2 first provides a stable support foundation for the entire device, ensuring that the device will not shake or shift during the machine tool thermal error test. Then, by operating the lifting drive assembly in the lifting adjustment structure, it is coupled with the drive component 16 that passes through the bottom column 3 and the top column 6, driving the drive component 16 to move stably within the internal space defined by the bottom column 3 and the top column 6. Since the main lifting rod 13 passes through the top column 6 and is directly connected to the drive component 16, the movement of the drive component 16 will synchronously drive the main lifting rod 13 to move smoothly along the axial direction of the top column 6. The auxiliary rod 11 connected to the main lifting rod 13 will adjust its position synchronously with the movement of the main lifting rod 13, thereby driving the sensor mounting assembly connected to the auxiliary rod 11 to achieve precise position adjustment, and finally enabling the sensor mounting assembly to accurately reach the target position required for the machine tool thermal error test. In terms of effectiveness, the stable support of the base connecting plate provides a stable premise for the operation of all subsequent components, avoiding test deviations due to unstable foundations; the lifting adjustment structure, through the limiting of the driving component 16 by the bottom column 3 and the top column 6, and the coupling transmission between the lifting drive assembly and the driving component 16, ensures the smoothness and accuracy of the lifting action of the main lifting rod 13, preventing the main lifting rod 13 from deviating during movement; the connection between the main lifting rod 13 and the auxiliary rod 11 realizes the effective transmission of motion, ensuring that the sensor mounting assembly can move accurately according to the adjustment requirements, providing a reliable guarantee for the smooth conduct of machine tool thermal error testing and the accuracy of test data.

[0032] In one embodiment, the fixed plate drive component 16 is a lead screw, one end of which is movably disposed in the threaded through hole at the bottom of the main lifting rod 13 of the fixed plate, and the other end is rotatably disposed in the bottom column 3 of the fixed plate.

[0033] In this embodiment, when the driving component 16 is specifically a lead screw, its operation is as follows: one end of the lead screw is movably adapted to the threaded through hole at the bottom of the main lifting rod 13, forming a threaded transmission engagement, while the other end is rotatably installed inside the base column 3, so that the base column 3 provides stable radial support and rotation limit for the lead screw; when it is necessary to adjust the height of the main lifting rod 13, an external force drives the lead screw to rotate within the base column 3. Since there is a threaded engagement relationship between the lead screw and the threaded through hole at the bottom of the main lifting rod 13, the rotational motion of the lead screw is converted into the linear motion of the main lifting rod 13 along the axial direction, and the moving direction of the main lifting rod 13 is matched with the rotation direction of the lead screw, thereby achieving precise adjustment of the height of the main lifting rod 13. In terms of effectiveness, the lead screw, as the threaded transmission structure of the drive component 16, can effectively prevent the main lifting rod 13 from shifting or jamming during movement, ensuring the stability and accuracy of height adjustment. At the same time, the rotatable support of the lead screw by the base column 3 further ensures the coaxiality of the lead screw during rotation, reduces the movement deviation of the main lifting rod 13 caused by lead screw skew, and provides a reliable guarantee for the accurate positioning of the subsequent auxiliary rod 11 and sensor mounting components, thereby improving the accuracy of sensor position adjustment during machine tool thermal error testing.

[0034] In one embodiment, the fixed plate lifting drive assembly includes a first transmission gear 18 and a lifting handle 4. The first transmission gear 18 is fixed to the outer ring surface of the fixed plate drive component 16. The lifting handle 4 is rotatably mounted on the side wall of the fixed plate bottom column 3 through a lifting bearing 21, and its end is provided with a second transmission gear 22. The second transmission gear 22 of the fixed plate meshes with the first transmission gear 18 of the fixed plate.

[0035] In this embodiment, the lifting drive assembly operates as follows: When the height of the main lifting rod 13 needs to be adjusted to meet the requirements of machine tool thermal error testing, the operator can apply rotational force to the lifting handle 4, which is mounted on the side wall of the bottom column 3. Since the second transmission gear 22 at the end of the lifting handle 4 meshes with the first transmission gear 18 fixed on the outer ring surface of the drive component 16, the rotation of the lifting handle 4 will drive the second transmission gear 22 to rotate synchronously, and then drive the first transmission gear 18 to rotate through the gear meshing action. The first transmission gear 18 is fixedly connected to the drive component 16, so the rotation of the first transmission gear 18 will directly drive the drive component 16 to rotate inside the bottom column 3 and the top column 6. Since the drive component 16 is connected to the main lifting rod 13, which is mounted inside the top column 6, the rotation of the drive component 16 will be converted into a linear movement of the main lifting rod 13 along the axial direction of the top column 6. The main lifting rod 13 will further drive the auxiliary rod 11 connected to it, and finally realize the height adjustment of the sensor mounting assembly on the auxiliary rod 11. In terms of effectiveness, the meshing transmission of the first transmission gear 18 and the second transmission gear 22 effectively ensures the stability and accuracy of the power transmission of the lifting drive component, avoids adjustment deviations caused by transmission slippage, and ensures the accuracy of the height adjustment of the main lifting rod 13. At the same time, the lifting handle 4 is rotatably mounted on the side wall of the base column 3, providing a convenient operating position for the operator. Adjustment can be achieved without direct contact with the drive component 16, making operation more labor-saving and convenient. In addition, the structural characteristics of the gear transmission make the rotation speed of the drive component 16 more stable and controllable, preventing the main lifting rod 13 from surging due to excessive speed or instability of the drive component 16. This provides reliable support for the sensor mounting component to accurately reach the test target position, further ensuring the accuracy of the machine tool thermal error test data.

[0036] In one embodiment, a first bearing 17 is provided between the fixed plate drive member 16 and the bottom column 3 of the fixed plate, and a second bearing 19 is provided between the drive member 16 and the top column 6 of the fixed plate.

[0037] In this embodiment, when the lifting drive assembly drives the drive component 16 to rotate to adjust the height of the main lifting rod 13, the first bearing 17 between the drive component 16 and the bottom column 3, and the second bearing 19 between the drive component 16 and the top column 6 respectively undertake the functions of support and resistance reduction: the first bearing 17 limits the rotation of the drive component 16 in the bottom column 3 to a preset axial range, avoiding direct contact and friction between the drive component 16 and the inner wall of the bottom column 3 due to radial offset; the second bearing 19 simultaneously provides axial limit and rotation assistance for the part of the drive component 16 located in the top column 6, ensuring that the entire drive component 16 maintains stable coaxial rotation in the space jointly formed by the bottom column 3 and the top column 6. This dual-bearing working method significantly reduces the mechanical frictional resistance between the drive component 16 and the bottom column 3 and top column 6, allowing the drive component 16 to rotate more smoothly, reducing component wear and extending service life. On the other hand, the first bearing 17 and the second bearing 19 together ensure the coaxiality of the drive component 16 during rotation, effectively preventing the main lifting rod 13 from jamming or radially shifting when rising and falling within the top column 6 due to the misalignment of the drive component 16. This ensures that the auxiliary rod 11 connected to the main lifting rod 13 can stably drive the sensor mounting assembly to accurately adjust its position, providing reliable support for the accurate positioning of the sensor and the accuracy of the test data during the machine tool thermal error test.

[0038] In one embodiment, the top column 6 of the fixed plate is provided with a vertical guide groove, and the main lifting rod 13 of the fixed plate is provided with an adapter slider, which is restricted to movement within the vertical guide groove of the fixed plate.

[0039] In this embodiment, when the drive unit 16 drives the main lifting rod 13 to perform lifting and lowering actions, the adapter slider on the main lifting rod 13 will slide synchronously in the vertical guide groove inside the top column 6. The vertical guide groove, by limiting the range of motion of the adapter slider, can effectively prevent the main lifting rod 13 from circumferentially offset as the drive unit 16 rotates, allowing the main lifting rod 13 to only make stable linear lifting and lowering movements along the extension direction of the vertical guide groove. In terms of effect, this structural cooperation avoids radial swaying or deflection of the main lifting rod 13 during lifting and lowering, ensuring that the main lifting rod 13 always moves in the preset vertical direction, greatly improving the accuracy of height adjustment; at the same time, the structural limit further ensures the stability of the movement of the main lifting rod 13, thereby enabling the auxiliary rod 11 connected to the main lifting rod 13 to maintain stable synchronous movement, ultimately ensuring that the sensor mounting assembly on the auxiliary rod 11 can accurately reach the target position of the machine tool thermal error test, laying a structural foundation for the accuracy of subsequent test data.

[0040] In one embodiment, the main lifting rod 13 of the fixed plate and the auxiliary rod 11 of the fixed plate are distributed in parallel; the machine tool thermal error testing device also includes a ball joint connecting rod 9, which is connected between the auxiliary rod 11 of the fixed plate and the sensor mounting assembly of the fixed plate, and the ball joint connecting rod 9 of the fixed plate is perpendicular to the auxiliary rod 11 of the fixed plate.

[0041] In this embodiment, when the machine tool thermal error testing device is working, as the main lifting rod 13 moves up and down along the top column 6, the auxiliary rod 11 will move smoothly in a straight line synchronously with the main lifting rod 13 because the main lifting rod 13 and the auxiliary rod 11 are parallel to each other, thus avoiding tilting or deviation of the auxiliary rod 11. When it is necessary to adjust the test angle of the sensor mounting assembly to adapt to the thermal error testing requirements of different positions of the machine tool, the ball joint connecting rod 9 connected between the auxiliary rod 11 and the sensor mounting assembly can take advantage of its multi-angle rotation characteristics. While maintaining a perpendicular state to the auxiliary rod 11, it can drive the sensor mounting assembly to flexibly adjust its spatial posture, ensuring that the sensor mounting assembly can be accurately aligned with the test area of ​​the machine tool. In terms of effectiveness, the parallel distribution of the main lifting rod 13 and the auxiliary rod 11 provides a stable directional reference for the movement of the auxiliary rod 11, preventing positional deviations when the auxiliary rod 11 moves with the main lifting rod 13 and ensuring the accuracy of the movement of the sensor mounting assembly foundation. The ball joint connecting rod 9, which is perpendicular to the auxiliary rod 11, not only achieves stable force and motion transmission between the auxiliary rod 11 and the sensor mounting assembly, but also provides the sensor mounting assembly with flexible angle adjustment capabilities through its own rotation function. This allows the device to adapt to more diverse machine tool thermal error testing scenarios, while preventing the sensor mounting assembly from deviating from the test target due to excessive adjustment, further improving the accuracy and adaptability of machine tool thermal error testing.

[0042] Specifically, the sensor mounting assembly includes an eddy current sensor connection plate 8 and a level 7 mounted on its front and left sides.

[0043] In one embodiment, the machine tool thermal error testing device includes a secondary rod connecting buckle 10, a connecting fixed plate ball joint connecting rod 9 and a fixed plate secondary rod 11; the fixed plate secondary rod connecting buckle 10 has a cavity with an opening on one side and fixed plates disposed on both sides of the cavity opening, and a secondary rod rotating handle 20 is disposed on the two fixed plates.

[0044] In this embodiment, the machine tool thermal error testing device achieves reliable connection and flexible adjustment between the ball joint link 9 and the secondary link 11 through the secondary link connecting buckle 10. During installation, the secondary link connecting buckle 10 utilizes the cavity with an opening on one side to fit the secondary link 11, allowing it to form a preliminary position within the cavity. The operator can rotate the secondary link rotating handle 20 on the two fixed plates to tighten the distance between the two fixed plates through the adjustment action of the handle, ensuring that the secondary link 11 will not loosen during the test. During operation, when the secondary link 11 adjusts its height synchronously with the main lifting rod 13, the secondary link connecting buckle 10 can stably transmit the movement of the secondary link 11 to the ball joint link 9, thereby driving the sensor mounting assembly to maintain synchronous movement. If it is necessary to fine-tune the angle of the ball joint link 9 to adapt to different testing requirements, simply loosen the secondary link rotating handle 20 appropriately, and then tighten the handle again after adjusting to the target angle to fix it, without disassembling the overall structure.

[0045] In one embodiment, the machine tool thermal error testing device further includes a main rod connecting buckle 14, a main rod rotating handle 15, and a reversing connecting rod 12. The main rod connecting buckle 14 has a cavity with an opening on one side and fixed plates disposed on both sides of the cavity opening. The main lifting rod 13 of the fixed plate passes through the cavity of the fixed plate. The main rod rotating handle 15 passes through the threaded holes of the two fixed plates. The reversing connecting rod 12 connects the main rod connecting buckle 14 of the fixed plate and the auxiliary rod 11 of the fixed plate.

[0046] In this embodiment, the assembly and operation process of the machine tool thermal error testing device is as follows: First, the main lifting rod 13 is inserted into the cavity of the opening on one side of the main rod connecting buckle 14. By tightening the main rod rotating handle 15, which is inserted into the threaded holes of the fixing plates on both sides of the cavity opening of the main rod connecting buckle 14, the fixing plates are tightened towards the inside of the cavity and tightly fit against the outer wall of the main lifting rod 13, thereby achieving a stable fixation between the main rod connecting buckle 14 and the main lifting rod 13 and preventing relative sliding between the two in subsequent movements. Then, the main rod connecting buckle 14 and the auxiliary rod 11 are connected by the reversing connecting rod 12 to establish a stable path for the main lifting rod 13 to transmit motion to the auxiliary rod 11. When the lifting and adjusting structure drives the main lifting rod 13 to move up and down along the top column 6, the main lifting rod 13 will drive the main rod connecting buckle 14 fixed thereto to move synchronously. The main rod connecting buckle 14 then transmits the movement precisely to the auxiliary rod 11 through the reversing connecting rod 12, so that the auxiliary rod 11 can achieve a smooth synchronous displacement with the main lifting rod 13. If it is necessary to adjust the position of the auxiliary rod 11 relative to the main lifting rod 13 during the test to adapt to different machine tool thermal error test points, simply loosen the main rod rotating handle 15, push the main rod connecting buckle 14 to slide along the main lifting rod 13 to the target position, and then tighten the main rod rotating handle 15 to complete the fixation. There is no need to disassemble the overall structure of the device. In terms of effectiveness, the cooperation between the cavity of the main rod connecting buckle 14 and the main rod rotating handle 15 ensures the reliability of the connection between the main lifting rod 13 and the main rod connecting buckle 14, providing a solid foundation for motion transmission. It also enables the main rod connecting buckle 14 to be adjusted and fixed on the main lifting rod 13, greatly improving the installation flexibility of the device. Meanwhile, the reversing connecting rod 12 effectively connects the main rod connecting buckle 14 and the auxiliary rod 11, ensuring that the lifting motion of the main lifting rod 13 can be accurately and synchronously transmitted to the auxiliary rod 11. This, in turn, ensures that the auxiliary rod 11 drives the sensor mounting assembly to accurately reach the test target position, providing strong support for the accuracy and ease of operation of machine tool thermal error testing.

[0047] In one embodiment, the fixed plate base assembly 2 further includes a permanent magnet 1, which is fixed to the bottom of the fixed plate base connecting plate.

[0048] In this embodiment, the base assembly 2 works as follows: the permanent magnet 1, fixed to the bottom of the base connecting plate, can directly adhere to the machine tool worktable or other suitable metal mounting surface using its own strong magnetism. Without additional drilling or bolt tightening, the base connecting plate and the entire base assembly 2 can be stably fixed by magnetic force. If it is necessary to adjust the test position of the device on the machine tool, simply apply an appropriate external force to push the base connecting plate, and the permanent magnet 1 will move synchronously with the base connecting plate. After moving to the target position, releasing the external force will allow it to be stably fixed again by magnetic adsorption. In terms of effectiveness, the combination of the permanent magnet 1 and the base connecting plate eliminates the structural damage to the machine tool table caused by traditional bolt fixing, and can adapt to machine tool tables of different specifications and structures, greatly improving the versatility of the base assembly 2. On the other hand, the strong magnetic adsorption provides reliable fixing force, effectively resisting vibration during machine tool operation and preventing displacement or shaking of the base connecting plate and the entire device, laying the foundation for the stable operation of subsequent lifting adjustment structures, main lifting rod 13 and other components. At the same time, the magnetic fixing method makes the disassembly and reassembly and position adjustment of the device more convenient, eliminating the need for cumbersome bolt installation and removal operations, significantly improving the preparation efficiency before machine tool thermal error testing and the flexibility of position adjustment during testing.

[0049] In one embodiment, a fixing plate is provided on the side where the bottom post 3 of the fixing plate and the top post 6 of the fixing plate abut against each other. Both fixing plates are provided with threaded holes, and screws 5 are inserted into the threaded holes of the fixing plates.

[0050] In this embodiment, the assembly and fixation of the bottom column 3 and the top column 6 are achieved through the cooperation of the fixing plate, threaded hole and screw 5 on the side where they abut each other: During assembly, the fixing plate of the bottom column 3 and the fixing plate of the top column 6 are aligned first, so that the threaded holes on the two are precisely coaxial. Then, the screw 5 is inserted into the aligned threaded hole. The axial fastening force generated by tightening the screw 5 makes the two fixing plates fit tightly together, thereby stably connecting the bottom column 3 and the top column 6 into a whole. If the internal components of the bottom column 3 or the top column 6 need to be maintained in the future, the screw 5 can be loosened to separate the bottom column 3 and the top column 6. After the operation is completed, the threaded hole is realigned and the screw 5 is tightened to restore the stable connection between the two.

[0051] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A machine tool thermal error testing device, characterized in that, include: Base assembly (2), including base connecting plate; The lifting and adjusting structure includes a bottom column (3) connected to the base connecting plate, a top column (6) connected to the bottom column (3), a driving component (16) passing through the bottom column (3) and the top column (6), and a lifting and adjusting drive assembly coupled to the driving component (16). The main lifting rod (13) passes through the top column (6) and is connected to the drive unit (16); The auxiliary rod (11) is connected to the main lifting rod (13); The sensor mounting assembly is connected to the sub-rod (11).

2. The machine tool thermal error testing device according to claim 1, characterized in that, The driving component (16) is a lead screw, one end of which is movably disposed in the threaded through hole at the bottom of the main lifting rod (13), and the other end is rotatably disposed in the bottom column (3).

3. The machine tool thermal error testing device according to claim 2, characterized in that, The lifting drive component includes: The first transmission gear (18) is fixed on the outer ring surface of the drive component (16); The lifting handle (4) is rotatably mounted on the side wall of the bottom column (3), and its end is provided with a second transmission gear (22), which meshes with the first transmission gear (18).

4. The machine tool thermal error testing device according to claim 2 or 3, characterized in that, A first bearing (17) is provided between the drive component (16) and the bottom column (3), and a second bearing (19) is provided between the drive component (16) and the top column (6).

5. The machine tool thermal error testing device according to claim 3, characterized in that, The top column (6) is provided with a vertical guide groove inside, and the main lifting rod (13) is provided with an adapter slider, which is restricted to movement within the vertical guide groove.

6. The machine tool thermal error testing device according to claim 1, characterized in that, The main lifting rod (13) and the auxiliary rod (11) are distributed in parallel; It also includes a ball joint link (9) connected between the secondary rod (11) and the sensor mounting assembly, the ball joint link (9) being perpendicular to the secondary rod (11); The sensor mounting assembly includes an eddy current sensor connection plate (8) and a level (7) mounted on its front and left sides. The ball joint end of the eddy current sensor connecting plate (8) can move in the ball joint groove of the ball joint connecting rod (9) to adjust the level of the eddy current sensor connecting plate (8).

7. The machine tool thermal error testing device according to claim 6, characterized in that, It also includes a secondary rod connecting buckle (10) that connects the ball joint connecting rod (9) and the secondary rod (11); the secondary rod connecting buckle (10) has a cavity with an opening on one side and fixing plates provided on both sides of the cavity opening, and a secondary rod rotating handle (20) is provided on the two fixing plates. The fixed plate is connected to the ball joint link (9).

8. The machine tool thermal error testing device according to claim 1, characterized in that, Also includes: The main rod connecting buckle (14) has a cavity with an opening on one side and fixing plates set on both sides of the cavity opening, and the main lifting rod (13) passes through the cavity; The main rod rotating handle (15) is inserted into the threaded holes of the two fixed plates; The reversing connecting rod (12) is connected between the main rod connecting buckle (14) and the auxiliary rod (11).

9. The machine tool thermal error testing device according to claim 1, characterized in that, The base assembly (2) also includes a permanent magnet (1) fixed to the bottom of the base connecting plate.

10. The machine tool thermal error testing device according to claim 1, characterized in that, The bottom column (3) and the top column (6) are both provided with a fixing plate on the side that abuts against each other. Both fixing plates are provided with threaded holes, and screws (5) are inserted into the threaded holes.

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