A torque detector for the lead screw of a ball screw pair

Abstract

The present invention provides a torque detector for the lead screw of a ball screw pair, which includes a lead screw driving mechanism arranged on a machine tool main body and a torque detecting mechanism arranged corresponding to the lead screw driving mechanism on the machine tool main body; the lead screw driving mechanism includes a driving chuck and a driven chuck arranged correspondingly on the machine tool main body, both the driving chuck and the driven chuck are rotatably arranged on the machine tool main body, and a power assembly for driving the driving chuck to rotate is arranged on the machine tool main body; the torque detecting mechanism includes a detecting table slidably arranged on the machine tool main body. The present invention provides a torque detector for the lead screw of a ball screw pair, which has an adjustable function, can be used to detect lead screws with different strokes and different sizes, has a simple structure, is convenient to operate, has a low production cost, has a simple operation process during detection, precise control, and the test results are specific and detailed.

Description

Technical Field

[0001] The present invention belongs to the field of screw torque detection, and particularly relates to a screw torque detector for a ball screw pair. Background Art

[0002] A ball screw pair is composed of a ball screw, a ball nut and steel balls. Its function is to convert rotational motion into linear motion. It extends the function of a trapezoidal screw, converts the sliding friction of the trapezoidal screw into rolling friction, reduces the friction between the screw and the nut, and improves the efficiency and accuracy of the screw. Since it is difficult to manufacture the ball nut and the ball screw, especially for slender screws, it is easy to bend or have a phenomenon of large or small ends during the processing. Therefore, after the processing is completed, standard accuracy detection will be carried out, and a ball screw pair torque detector is used to verify whether the ball screw is qualified. On the one hand, the ball screw pair torque detector can detect the torque value required during the operation of the ball screw pair, and on the other hand, it can also verify the smoothness of the operation of the ball screw pair and detect whether the screw has a large or small end situation; however, the existing ball screw pair detectors generally cannot move synchronously with the ball nut, the detection effect is not good, and the applicability to ball nuts and screws of different specifications is not good, which is not conducive to improving the detection efficiency and detection effect of the ball screw pair. Summary of the Invention

[0003] In view of this, the present invention aims to provide a screw torque detector for a ball screw pair to solve the problem of poor applicability of the existing ball screw pair detectors.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A screw torque detector for a ball screw pair includes a screw driving mechanism arranged on a machine tool main body and a torque detection mechanism arranged on the machine tool main body corresponding to the screw driving mechanism;

[0006] The screw driving mechanism includes a driving chuck and a driven chuck correspondingly arranged on the machine tool main body. Both the driving chuck and the driven chuck are rotatably arranged on the machine tool main body, and a power assembly for driving the driving chuck to rotate is arranged on the machine tool main body;

[0007] The torque detection mechanism includes a detection table slidably arranged on the machine tool main body. A nut torque detection component for cooperating with the ball nut to realize torque detection and a probe clamping component for cooperating with the screw to realize the movement of the detection table are arranged on the detection table. The moving direction of the detection table is the same as the length direction of the screw.

[0008] Further, the active chuck and the driven chuck are respectively arranged corresponding to the left and right ends of the machine tool body. A sliding seat for installing the driven chuck is provided on the machine tool body. The sliding seat is slidably installed on the machine tool body, and the moving direction of the sliding seat is the same as the length direction of the lead screw. The inspection table is arranged on the machine tool body at a position corresponding to between the active chuck and the driven chuck.

[0009] Further, the nut torque detection assembly includes a load cell arranged on the inspection table and a torque detection positioning block arranged at the detection end of the load cell. An anti-rotation screw matched with the mounting hole on the ball nut is provided on the torque detection positioning block.

[0010] Further, a fixing block for fixing the load cell is provided on the inspection table. An assembly hole for installing the load cell is provided on the fixing block. A rotary locking handle is provided at a position corresponding to the assembly hole on the fixing block. One end of the rotary locking handle extending into the assembly hole abuts against the load cell.

[0011] Further, a positioning groove matched with the anti-rotation screw is provided on the torque detection positioning block. A locking nut for fixing the ball nut is provided on the anti-rotation screw.

[0012] Further, the probe clamping assembly includes an upper fixing clamp and a lower fixing clamp correspondingly arranged on the inspection table. Both the upper fixing clamp and the lower fixing clamp are rotatably installed on the inspection table. A clamping gap for accommodating the lead screw exists between the upper fixing clamp and the lower fixing clamp. An adjustable connecting rod for adjusting the size of the clamping gap is provided between the upper fixing clamp and the lower fixing clamp.

[0013] Further, the probe clamping assembly further includes a support arranged on the inspection table and a connecting rod arranged on the support. The connecting rod is slidably arranged on the support. A connecting hole for installing the connecting rod is provided on the support. One end of the connecting rod passing through the connecting hole is provided with a connecting plate for installing the upper fixing clamp and the lower fixing clamp, and the other end is provided with a limit end cover. Both the upper fixing clamp and the lower fixing clamp are rotatably arranged on the connecting plate. A limit plate for restricting the rotation of the lower fixing clamp is provided at a position corresponding to below the lower fixing clamp on the support; a first knob handle is provided at a position corresponding to the connecting rod on the support. One end of the first screwing handle extending into the connecting hole abuts against the connecting rod.

[0014] Further, clamping blocks capable of cooperating with the lead screw are provided on both the upper fixing clamp and the lower fixing clamp. One end of the clamping block is installed and fixed on the upper fixing clamp or the lower fixing clamp through a second knob handle, and the other end is provided with a clamping pin capable of cooperating with the spiral groove of the lead screw. Strip-shaped holes for installing the second knob handle are provided on both the upper fixing clamp and the lower fixing clamp. One end of the second knob handle passing through the strip-shaped hole is threadedly connected to the clamping block.

[0015] Further, one end of the adjustable connecting rod is provided with a handle member, and the other end is provided with a limit nut. The adjustable connecting rod is provided with an external thread that cooperates with the limit nut. The upper fixing clip is provided with an upper adjusting seat that cooperates with the adjustable connecting rod. The upper adjusting seat is rotatably installed on the upper fixing clip, and the upper adjusting seat is provided with an adjusting groove that cooperates with the adjustable connecting rod. The lower fixing clip is provided with a lower adjusting seat, the lower adjusting seat is rotatably installed on the lower fixing clip, and the lower adjusting seat is provided with an adjusting hole that slidably cooperates with the adjustable connecting rod. One end of the adjustable connecting rod passing through the adjusting hole is provided with a spring, one end of the spring abuts against the lower adjusting seat, and the other end abuts against the limit nut.

[0016] Compared with the prior art, the ball screw pair screw torque detector of the present invention has the following advantages:

[0017] The present invention provides a ball screw pair screw torque detector, which has an adjustable function, can be used to detect screws with different strokes and different sizes, and has a simple structure, convenient operation, low production cost, simple operation in the detection process, precise control, and the test results are specific and detailed. By setting an active chuck and a driven chuck on the machine tool main body, and sliding the driven chuck on the machine tool main body, by adjusting the position of the driven chuck on the machine tool main body, this detector can detect screws of different lengths. By setting a detection table on the machine tool main body that can move with the ball nut, and using the probe clamping assembly set on the detection table to cooperate with the screw, the synchronous movement between the detection table and the ball nut is realized, improving the detection accuracy and detection effect of the nut torque detection assembly on the detection table. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a schematic structural diagram of a ball screw pair screw torque detector according to an embodiment of the present invention;

[0020] Figure 2 is a schematic structural diagram of a ball screw pair screw torque detector according to an embodiment of the present invention when detecting a ball screw pair;

[0021] Figure 3 is Figure 2 a partial enlarged view of part A in;

[0022] Figure 4 is a schematic structural diagram of an active chuck in a ball screw pair screw torque detector according to an embodiment of the present invention;

[0023] Figure 5 is Figure 4 a schematic structural diagram in the A-A direction in;

[0024] Figure 6 Schematic structural diagram of the driven chuck in a ball screw pair screw torque detector according to an embodiment of the present invention;

[0025] Figure 7 is Figure 6 Schematic structural diagram in the B-B direction in;

[0026] Figure 8 Schematic structural diagram of the nut torque detection assembly in a ball screw pair screw torque detector according to an embodiment of the present invention;

[0027] Figure 9 is Figure 8 Left view of;

[0028] Figure 10 is Figure 8 Top view of;

[0029] Figure 11 Schematic structural diagram of the probe clamping assembly in a ball screw pair screw torque detector according to an embodiment of the present invention;

[0030] Figure 12 is Figure 11 Left view of;

[0031] Figure 13 is Figure 11 Top view of.

[0032] Explanation of reference numerals:

[0033] 1, machine tool main body; 2, driving chuck; 3, screw rod; 4, driven chuck; 5, detection table; 6, probe clamping assembly; 7, nut torque detection assembly; 8, ball nut; 9, power assembly; 10, sliding seat; 11, mounting seat; 12, strip hole; 13, clamping block; 14, clamping pin; 15, upper fixing clamp; 16, weighing sensor; 17, torque detection positioning block; 18, rotary locking handle; 19, fixing block; 20, first knob handle; 21, connecting rod; 22, limiting end cover; 23, support; 24, handle member; 25, upper adjusting seat; 26, lower adjusting seat; 27, adjustable connecting rod; 28, second knob handle; 29, lower fixing clamp; 30, anti-rotation screw; 31, driving motor; 32, main driving wheel; 33, belt; 34, driven driving wheel; 35, locking handle; 36, locking nut; 37, connecting plate; 38, positioning nut; 39, limiting nut; 40, spring; 41, limiting plate. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0036] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0037] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0038] A ball screw pair screw torque detector, as Figures 1 to 13 shown, includes a screw driving mechanism provided on a machine tool main body 1 and a torque detecting mechanism provided on the machine tool main body 1 corresponding to the screw driving mechanism;

[0039] The screw driving mechanism includes a driving chuck 2 and a driven chuck 4 correspondingly provided on the machine tool main body 1. Both the driving chuck 2 and the driven chuck 4 are rotatably provided on the machine tool main body 1. A power assembly 9 for driving the driving chuck 2 to rotate is provided on the machine tool main body 1. The driving chuck 2 can be installed on the machine tool main body 1 through a mounting seat 11. The mounting seat 11 is fixedly installed on the machine tool main body 1 by screws. The driving chuck 2 is rotatably installed on the mounting seat 11 through a bearing.

[0040] Optionally, the power assembly 9 includes a drive motor 31 for driving the rotation of the active chuck 2. The drive motor 31 drives the rotation of the active chuck 2 through a belt 33 and a transmission pulley. The output end of the drive motor 31 can be sequentially provided with a main reduction gear and a main transmission pulley 32. A driven transmission pulley 34 can be provided on the active chuck 2. The main transmission pulley 32 and the driven transmission pulley 34 are connected by a belt 33 to drive the rotation of the active chuck 2. The drive motor 31 can be installed on the machine tool body 1 through a motor connection seat. The active chuck 2 is used to provide rotational power for the lead screw 3 and fix one end of the lead screw 3. The driven chuck 4 is mainly used to fix the other end of the lead screw 3.

[0041] In order to reduce the use cost and reduce the limitation of the diameter of the ball screw pair by this detector, both the active chuck 2 and the driven chuck 4 can adopt chucks with a through-hole spindle design. When it is necessary to detect the ball screw, the ball screw is passed through the active chuck 2, and a ball nut 8 is installed, and then passed through the driven chuck 4. The lead screw 3 is locked and the concentricity of the active chuck and the driven chuck is adjusted, and the assembly of the lead screw 3 on the machine tool body 1 can be realized, which is convenient for the active chuck 2 to drive the lead screw 3 to rotate for detection.

[0042] Optionally, the active chuck 2 and the driven chuck 4 are respectively arranged corresponding to the left and right ends of the machine tool body 1. A sliding seat 10 for installing the driven chuck 4 is provided on the machine tool body 1. The sliding seat 10 is slidably installed on the machine tool body 1. The moving direction of the sliding seat 10 is the same as the length direction of the lead screw 3. A slide rail for installing the sliding seat 10 can be provided on the machine tool body 1. The sliding seat 10 can slide along the slide rail. A locking handle 35 cooperating with the slide rail can be provided on the sliding seat 10 to fix the sliding seat 10 on the slide rail.

[0043] Among them, the inspection table 5 can be arranged at a position corresponding to the active chuck 2 and the driven chuck 4 on the machine tool body 1. A slide rail for installing the inspection table 5 can also be provided on the machine tool body 1 to realize the sliding of the inspection table 5 on the machine tool body 1. By arranging the inspection table 5 between the active chuck 2 and the driven chuck 4, after fixing both ends of the lead screw 3 by the active chuck 2 and the driven chuck 4, and then using the inspection table 5 for inspection, it is beneficial to improve the stability of the lead screw 3 during the inspection process and improve the inspection effect and inspection accuracy of the torque inspection mechanism.

[0044] By adopting the active chuck 2 and the driven chuck 4 with a through-hole design on the main shaft, this torque detector also has a great advantage that it can detect lead screws 3 of different lengths. The driven chuck 4 is slidably installed on the machine tool body 1. By adjusting the position of the driven chuck 4 on the machine tool body 1, the distance between the active chuck 2 and the driven chuck 4 can be adjusted. The driven chuck 4 can be fixed at any position on the machine tool body 1 to install and detect lead screws 3 of any length. By setting the adjustable driven chuck 4, the overall structure of the machine tool is greatly simplified, facilitating the operator to install lead screws 3 of different lengths on the machine tool for detection.

[0045] The torque detection mechanism includes a detection table 5 slidably arranged on the machine tool body 1. On the detection table 5, there are a nut torque detection component 7 for cooperating with the ball nut 8 to achieve torque detection, and a probe clamping component 6 for cooperating with the lead screw 3 to achieve the movement of the detection table 5. The moving direction of the detection table 5 is the same as the length direction of the lead screw 3.

[0046] The nut torque detection component 7 includes a weighing sensor 16 arranged on the detection table 5, and a torque detection positioning block 17 arranged at the detection end of the weighing sensor 16. On the torque detection positioning block 17, there is an anti-rotation screw 30 that cooperates with the mounting hole on the ball nut 8; on the torque detection positioning block 17, there is a positioning groove that cooperates with the anti-rotation screw 30. The positioning groove can be a V-shaped structure to achieve better cooperation between the torque detection positioning block 17 and the anti-rotation screw 30, and improve the stability of the anti-rotation screw 30 on the weighing sensor 16.

[0047] After the lead screw 3 is fixed by the left and right chucks, an anti-rotation screw 30 of an appropriate size can be installed in the mounting hole of the ball nut 8, and then the anti-rotation screw 30 is placed on the highly sensitive torque detection positioning block 17. The weighing sensor 16 below the torque detection positioning block 17 is used to achieve torque detection. Since the anti-rotation screw 30 restricts the rotation of the ball nut 8, the ball nut 8 will generate torque during movement. This torque applied to the torque detection positioning block is equivalent to the vertical downward gravity. This force will be recorded by the weighing sensor 16 and transmitted to the computer. The computer converts it into a torque value through calculation to achieve the detection of the rotation torque of the ball nut 8. Compared with torque detection mechanisms of other structures, this detector changes the direction of the torque force of the ball nut, not only reducing the detection difficulty of the torque force, but also having a simple overall structure of the torque detection mechanism, reducing the assembly difficulty of the ball nut, directly using the weighing sensor for detection, and having better reliability and detection accuracy.

[0048] Optionally, a locking nut 36 for fixing the ball nut 8 is provided on the anti-rotation screw 30. At least two locking nuts 36 can be correspondingly provided. There is a gap for cooperating with the ball nut 8 between the two locking nuts 36. The two locking nuts 36 can be used to clamp and fix the ball nut 8 to ensure the stable connection between the anti-rotation screw 30 and the ball nut 8. By adjusting the size of the gap between the locking nut 36 and the head of the anti-rotation screw 30, the stable cooperation between the anti-rotation screw 30 and the torque detection positioning block can also be achieved, preventing the anti-rotation screw 30 from shaking or moving in the positioning groove, further improving the stability of the anti-rotation screw 30 on the torque detection positioning block, and ensuring that the weighing sensor 16 can stably apply a force to the anti-rotation screw 30 for detection.

[0049] Optionally, a fixing block 19 for fixing the weighing sensor 16 is provided on the detection table 5. An assembly hole for installing the weighing sensor 16 is provided on the fixing block 19. A rotary locking handle 18 is provided at a position corresponding to the assembly hole on the fixing block 19. One end of the rotary locking handle 18 extending into the assembly hole abuts against the weighing sensor 16. The fixing block 19 can be installed and fixed on the detection table 5 by screws. A threaded hole for cooperating with the rotary locking handle 18 can be provided on the fixing block 19. By screwing the rotary locking handle 18, the fixing of the weighing sensor 16 can be achieved. The operator can adjust the position of the weighing sensor 16 on the fixing block 19 by loosening the rotary locking handle 18, facilitating the better cooperation between the torque detection positioning block on the weighing sensor 16 and the anti-rotation screw 30, and improving the applicability of this torque detection mechanism to nuts of different sizes.

[0050] The probe clamping assembly 6 includes an upper fixing clamp 15 and a lower fixing clamp 29 correspondingly arranged on the detection table 5. There is a clamping gap for accommodating the lead screw 3 between the upper fixing clamp 15 and the lower fixing clamp 29. An adjustable connecting rod 27 for adjusting the size of the clamping gap is provided between the upper fixing clamp 15 and the lower fixing clamp 29. Clamping blocks 13 capable of cooperating with the lead screw 3 are provided on one side of the upper fixing clamp 15 and the lower fixing clamp 29 facing the clamping gap. One end of the clamping block 13 is installed and fixed on the upper fixing clamp 15 or the lower fixing clamp 29 through a second knob handle 28, and the other end is provided with a clamping pin 14 capable of cooperating with the spiral groove of the lead screw 3. The clamping pin 14 on the clamping block 13 can cooperate with the spiral hook groove of the lead screw 3 to form a structure similar to the cooperation between the ball nut 8 and the lead screw 3. When the lead screw 3 rotates, the clamping block 13 can be driven to drive the fixing clamp and the support 23 to move.

[0051] Both the upper fixing clip 15 and the lower fixing clip 29 are provided with strip holes 12 for installing the second knob handle 28. One end of the second knob handle 28 passing through the strip hole 12 is threadedly connected to the clamping block 13. Threaded holes cooperating with the second knob handle 28 can be provided on the clamping block 13. By installing the second knob handle 28 using the strip hole 12, the operator can adjust the angle of the clamping block 13 and the position of the clamping block 13 on the upper fixing clip 15 or the lower fixing clip 29 according to the specifications of the spiral groove of the lead screw 3, so as to ensure that the clamping pin 14 on the clamping block 13 can be inserted into the spiral grooves of different lead screws 3; by providing the clamping pin 14 on the clamping block 13, the clamping pin 14 can be embedded into the spiral groove of the ball screw. By adjusting the positions of the clamping block 13 and the connecting rod 21, the clamping pin 14 can clamp lead screws 3 of any thickness and simulate the pitches of leads of any size. The clamping pin 14 can also be embedded into spiral grooves of any shape, improving the applicability of the probe clamping assembly 6 to different lead screws 3.

[0052] Optionally, the clamping pin 14 can also be rotatably installed on the clamping block 13. Bearing seats for installing the clamping pin 14 can be provided at both ends of the clamping block 13 to achieve stable rotation of the clamping pin 14 on the clamping block 13. By rotatably arranging the clamping pin 14 on the clamping block 13, when the clamping block 13 cooperates with the spiral groove of the lead screw 3, the rotating clamping pin 14 can play a role similar to that of the balls in the ball nut 8, reducing the friction between the clamping block 13 and the lead screw 3, facilitating the cooperation between the lead screw 3 and the clamping block 13, and then driving the support 23 and the inspection table 5 to move along with the ball nut 8, which is beneficial to improving the stability of the inspection table 5 when moving along with the ball nut 8 and also beneficial to improving the detection accuracy of the load cell 16 on the inspection table 5.

[0053] The inspection table 5 is provided with a support 23. The support 23 can be fixedly installed on the inspection table 5 by screws. The support 23 is provided with a connecting rod 21. The connecting rod 21 is horizontally slidably arranged on the support 23. The sliding direction of the connecting rod 21 is perpendicular to the length direction of the lead screw. The support 23 is provided with a connection hole for installing the connecting rod 21. One end of the connecting rod 21 passing through the connection hole is provided with a connecting plate 37 for installing the upper fixing clip 15 and the lower fixing clip 29, and the other end is provided with a limit end cap 22. The connecting plate 37 can be integrally formed with the connecting rod 21. The limit end cap 22 and the connecting rod 21 can be threadedly connected. The limit end cap 22 can limit the movement of the connecting rod 21 and prevent the connecting rod 21 from separating from the support 23.

[0054] At the position on the support 23 corresponding to the connecting rod 21, a first knob handle 20 is provided. One end of the first screwing handle extending into the connecting hole abuts against the connecting rod 21. On the support 23, a threaded hole for installing the first knob handle 20 is provided, and the threaded hole communicates with the connecting hole. The position of the connecting rod 21 can be adjusted according to the size of the lead screw 3 during actual operation by the operator, and then the first knob handle 20 is used to fix the connecting rod 21, which is convenient for the upper fixing clip 15 and the lower fixing clip 29 to cooperate with the lead screw 3, improving the applicability of the torque detection mechanism to lead screws 3 of different specifications.

[0055] Both the upper fixing clip 15 and the lower fixing clip 29 are rotatably arranged on the connecting plate 37 through a rotating shaft. At the position on the support 23 corresponding to the lower part of the lower fixing clip 29, a limiting plate 41 for restricting the rotation of the lower fixing clip 29 is provided. The limiting plate 41 can be installed and fixed on the support 23 by screws. The limiting plate 41 can restrict the lower fixing clip 29 to prevent the lower fixing clip 29 from rotating excessively downward, ensuring that the upper fixing clip 15 and the lower fixing clip 29 can better cooperate with the lead screw 3. By using the cooperation of the upper fixing clip 15 and the lower fixing clip 29 with the lead screw 3, when the lead screw 3 rotates, the detection table 5 can be driven to move along with the ball nut, ensuring the cooperation of the anti-rotation screw with the torque detection positioning block, further improving the detection effect and detection accuracy of the weighing sensor 16.

[0056] One end of the adjustable connecting rod 27 is provided with a handle member 24, and the other end is provided with a limiting nut 39. The adjustable connecting rod 27 is provided with an external thread that cooperates with the limiting nut 39. The upper fixing clip 15 is provided with an upper adjusting seat 25 that cooperates with the adjustable connecting rod 27. The upper adjusting seat 25 is rotatably installed on the upper fixing clip 15, and the upper adjusting seat 25 is provided with an adjusting groove that slidably cooperates with the adjustable connecting rod 27. The handle member 24 can be installed and fixed on the adjustable screw by screws. By abutting against the upper adjusting seat 25, the handle member 24 can limit the rotation of the upper fixing clip 15.

[0057] The lower fixing clip 29 is provided with a lower adjusting seat 26. The lower adjusting seat 26 is rotatably installed on the lower fixing clip 29. The lower adjusting seat 26 is provided with an adjusting hole that slidably cooperates with the adjustable connecting rod 27. One end of the adjustable connecting rod 27 passing through the adjusting hole is provided with a spring 40. One end of the spring 40 abuts against the lower adjusting seat 26, and the other end abuts against the limiting nut 39. By abutting against the lower adjusting seat 26, the spring 40 pushes the lower fixing clip 29 to rotate upward, changing the size of the clamping gap to achieve clamping of different lead screws. At the same time, the spring can also provide a clamping force for the upper fixing clip 15 and the lower fixing clip 29 to clamp the lead screw 3 towards the middle. Under the action of the restoring elastic force of the spring 40, the upper fixing clip 15 and the lower fixing clip 29 can jointly clamp the lead screw 3, enabling the clamping pin 14 on the clamping block 13 to better fit into the spiral groove of the lead screw 3.

[0058] Since the spring 40 has good elastic deformation ability, under the action of the spring 40, the clamping gap between the upper fixed clamp 15 and the lower fixed clamp 29 can vary with the diameter of the lead screw 3, enabling the probe clamping assembly 6 to cooperate with lead screws 3 of different diameters. Combining with the clamping pins 14 provided on the clamping block 13, the probe clamping assembly 6 can achieve cooperation with lead screws 3 of different diameters, shapes, and specifications. When the torque detection assembly can adapt to different lead screws 3, the torque detection mechanism can adapt to the torque detection of different lead screws 3, making this detector have high versatility and applicability, reducing the use difficulty of the torque detector, and being beneficial to improving the detection effect and detection efficiency of the lead screw 3 torque detection.

[0059] This detector has a detection effect on ball screws of different forms and sizes during the detection process, which greatly reduces the purchase quantity of machine tools, saves costs, and improves the detection efficiency of the lead screw 3. Moreover, both the upper fixed clamp 15 and the lower fixed clamp 29 are provided with strip holes 12 for facilitating the adjustment of the clamping block 13, so that the angle and position of the clamping block 13 can be adjusted. When this detector needs to be used for detection, the lead screw 3 can be fixed first, then the anti-rotation screw 30 is installed on the nut, and the anti-falling screw is made to fit with the torque detection positioning block. After that, the clamping block 13 can be used to clamp the lead screw 3, and the clamping block 13 is fixed tightly by using the second knob handle 28. Finally, the driving motor 31 is started to drive the lead screw 3 to rotate, and the force is applied to the anti-rotation screw 30 by using the load cell 16 for detection. When the driving motor 31 provides power, the lead screw 3 starts to rotate. However, since the ball nut 8 is restricted by the torque detection positioning block 17 and cannot rotate, the ball nut 8 and the probe clamping assembly 6 can move linearly together, enabling the detection table 5 to detect the torque during the synchronous movement with the ball nut 8.

[0060] In order to enable the high-sensitivity torque detection mechanism to move simultaneously with the ball nut 8, a ball guide rail for installing the detection table 5 can also be provided on the machine tool main body 1 to improve the movement stability of the detection table 5, enabling the detection table 5 and the components provided thereon to reach a state of synchronous movement with the ball nut 8. Since the existing torque detectors cannot determine whether the movement distance of the torque detector is consistent with the lead of the ball screw during detection, the detection effect and accuracy of the existing torque detectors are not good. The torque detector provided by the present invention, by setting the probe clamping assembly 6 that can synchronously simulate the lead movement of the ball nut 8, when the lead screw 3 drives the ball nut 8 to move, the detection table 5 can also be synchronously driven to move through the clamping block 13, so that the movement distance of the detection table 5 can be determined, enabling the movement distance of the detection table 5 to be synchronized with the lead distance of the ball nut 8, and no relative movement occurs between the ball nut 8 and the load cell 16, avoiding the test error caused by different movement distances and movement lead directions during the test process, and improving the detection effect of this detector.

[0061] In an optional embodiment, a positioning nut 38 is provided on the adjustable connecting rod 27 corresponding to the position between the upper adjusting seat 25 and the lower adjusting seat 26; an operator can adjust the reset elastic force of the spring 40 by adjusting the position of the limit nut 39 on the adjustable connecting rod 27, so that the spring 40 can better drive the upper fixing clip 15 and the lower fixing clip 29 to clamp the lead screw 3. The positioning nut 38 can cooperate with the limit plate 41 to jointly limit the rotation angle of the lower fixing clip 29, avoiding excessive upward or downward rotation of the lower fixing clip 29 and facilitating the operator to assemble the lead screw.

[0062] Before assembling the lead screw, the operator can first adjust the size of the clamping gap according to the lead screw specifications; by rotatably arranging the upper fixing clip 15 and the lower fixing clip 29 at both ends of the connecting plate 37, and rotatably installing the upper adjusting seat 25 on the upper fixing clip 15 through a rotating shaft, and rotatably installing the lower adjusting seat 26 on the lower fixing clip 29 through a rotating shaft, the upper fixing clip 15, the adjustable connecting rod 27, and the lower fixing clip 29 can form a link mechanism on the connecting plate 37, thereby realizing the rotation between the upper fixing clip 15 and the lower fixing clip 29. Then, by screwing the limit nut, the length of the adjustable screw rod and the elastic force of the spring are adjusted to realize the adjustment of the size of the clamping gap.

[0063] Optionally, the adjustment of the length of the adjustable screw rod can be achieved not only by adjusting the position of the limit nut 39 on the adjustable connecting rod 27, but also by adjusting the handle member 24; for example, the adjustment groove can adopt a thread groove that can be threadedly engaged with the adjustable connecting rod. When the operator screws the handle member 24 to drive the adjustable connecting rod 27 to rotate, the adjustable connecting rod 27 cooperates with the thread groove, and the upper adjusting seat and the adjustable connecting rod form a mechanism similar to a ball screw. As the adjustable connecting rod rotates, the upper adjusting seat can drive the upper fixing clip 15 to rotate slightly downward, thereby changing the size of the clamping gap and realizing the adjustment of the elastic force of the spring 40.

[0064] By setting various structures, there can be multiple ways of matching the clamping pin 14 with the spiral grooves of different lead screws 3, for example:

[0065] First, for detecting lead screws 3 of a unified specification, after the position and angle of the clamping blocks are adjusted, under the action of the reset elastic force of the spring 40, after clamping the lead screw 3 with the upper and lower clamping blocks 13, the clamping pins 14 on the clamping blocks 13 can be embedded into the spiral grooves on the lead screw 3.

[0066] Second, for detecting lead screws 3 of conventional different specifications, the position of the connecting rod 21 on the support 23 can be adjusted first to roughly adjust the relative position of the clamping block 13 and the lead screw 3. Under the action of the reset elastic force of the spring 40, after clamping the lead screw 3 with the upper and lower clamping blocks 13, the position and angle of the clamping block 13 are finely adjusted so that the clamping pins 14 on the clamping block 13 can be embedded into the spiral grooves on the lead screw 3.

[0067] III. For detecting the relatively thin or thick lead screw 3, it is necessary to first change the size of the clamping gap or the elastic force of the spring 40, and then adjust the positions of the connecting rod 21 and the clamping block 13 so that the clamping pin 14 on the clamping block 13 can be embedded in the spiral groove on the lead screw 3.

[0068] The present invention provides a torque detector for the lead screw of a ball screw pair, which has an adjustable function, can be used to detect lead screws with different strokes and different sizes, and has a simple structure, convenient operation, low production cost, simple operation in the detection process, precise control, and detailed test results; by setting an active chuck and a driven chuck on the machine tool body, and sliding the driven chuck on the machine tool body, by adjusting the position of the driven chuck on the machine tool body, this detector can detect lead screws of different lengths; by setting a detection table on the machine tool body that can move with the ball nut, and using the probe clamping assembly set on the detection table to cooperate with the lead screw, the synchronous movement between the detection table and the ball nut is realized, and the detection accuracy and detection effect of the nut torque detection assembly on the detection table are improved.

[0069] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A torque detector for the screw rod of a ball screw pair, characterized in that: it includes a screw rod driving mechanism arranged on the machine tool main body and a torque detecting mechanism arranged on the machine tool main body corresponding to the screw rod driving mechanism; The screw rod driving mechanism includes a driving chuck and a driven chuck correspondingly arranged on the machine tool main body. Both the driving chuck and the driven chuck are rotatably arranged on the machine tool main body, and a power assembly for driving the driving chuck to rotate is arranged on the machine tool main body; The torque detecting mechanism includes a detection table slidably arranged on the machine tool main body. A nut torque detecting component for cooperating with the ball nut to realize torque detection and a probe clamping component for cooperating with the screw rod to realize the movement of the detection table along with the ball nut are arranged on the detection table. The moving direction of the detection table is the same as the length direction of the screw rod; The nut torque detecting component includes a weighing sensor arranged on the detection table and a torque detecting positioning block arranged at the detection end of the weighing sensor. An anti-rotation screw for cooperating with the mounting hole on the ball nut is arranged on the torque detecting positioning block; A positioning groove for cooperating with the anti-rotation screw is arranged on the torque detecting positioning block, and a locking nut for fixing the ball nut is arranged on the anti-rotation screw; The probe clamping component includes an upper fixed clamp and a lower fixed clamp correspondingly arranged on the detection table. Both the upper fixed clamp and the lower fixed clamp are rotatably installed on the detection table. There is a clamping gap for accommodating the screw rod between the upper fixed clamp and the lower fixed clamp. The upper fixed clamp and the lower fixed clamp are connected by an adjustable connecting rod capable of adjusting the size of the clamping gap; Clamping blocks capable of cooperating with the screw rod are arranged on one side of the upper fixed clamp and the lower fixed clamp facing the clamping gap. One end of the clamping block is arranged on the upper fixed clamp or the lower fixed clamp, and the other end is provided with a clamping pin capable of cooperating with the spiral groove of the screw rod.

2. The torque detector for the screw rod of a ball screw pair according to claim 1, characterized in that: The driving chuck and the driven chuck are respectively arranged corresponding to the left and right ends of the machine tool main body. A sliding seat for installing the driven chuck is arranged on the machine tool main body. The sliding seat is slidably installed on the machine tool main body. The moving direction of the sliding seat is the same as the length direction of the screw rod. The detection table is arranged at a position between the driving chuck and the driven chuck on the machine tool main body.

3. The torque detector for the screw rod of a ball screw pair according to claim 1, characterized in that: A fixing block for fixing the weighing sensor is arranged on the detection table. An assembly hole for installing the weighing sensor is arranged on the fixing block. A rotary locking handle is arranged at a position corresponding to the assembly hole on the fixing block. One end of the rotary locking handle extending into the assembly hole abuts against the weighing sensor.

4. The torque detector for the screw rod of a ball screw pair according to claim 1, characterized in that: One end of the adjustable connecting rod is provided with a handle member, and the other end is provided with a limit nut. The adjustable connecting rod is provided with an external thread that cooperates with the limit nut. The upper fixing clip is provided with an upper adjusting seat that cooperates with the adjustable connecting rod. The upper adjusting seat is rotatably installed on the upper fixing clip, and the upper adjusting seat is provided with an adjusting groove that cooperates with the adjustable connecting rod. The lower fixing clip is provided with a lower adjusting seat. The lower adjusting seat is rotatably installed on the lower fixing clip. The lower adjusting seat is provided with an adjusting hole that slidably cooperates with the adjustable connecting rod. One end of the adjustable connecting rod passing through the adjusting hole is provided with a spring. One end of the spring abuts against the lower adjusting seat, and the other end abuts against the limit nut.

5. A ball screw pair screw torque detector according to claim 1, characterized in that: The probe clamping assembly further includes a support provided on the detection table and a connecting rod provided on the support. The connecting rod is slidably provided on the support. The support is provided with a connecting hole for installing the connecting rod. One end of the connecting rod passing through the connecting hole is provided with a connecting plate for installing the upper fixing clip and the lower fixing clip, and the other end is provided with a limit end cover. The upper fixing clip and the lower fixing clip are both rotatably provided on the connecting plate. A limiting plate for restricting the rotation of the lower fixing clip is provided at a position corresponding to the lower fixing clip on the support. A first knob handle is provided at a position corresponding to the connecting rod on the support. One end of the first screwing handle extending into the connecting hole abuts against the connecting rod.

6. A ball screw pair screw torque detector according to claim 4 or 5, characterized in that: The clamping block is installed on the upper fixing clip or the lower fixing clip through a second knob handle. The upper fixing clip and the lower fixing clip are both provided with strip-shaped holes for installing the second knob handle. One end of the second knob handle passing through the strip-shaped hole is threadedly connected to the clamping block.

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