Ball screw torque testing device

Abstract

This utility model discloses a ball screw torque testing device, including a chassis and a control box and a test box located on the top of the chassis. The control box contains a drive component, and the test box contains a torque measuring component. A support component is coaxially mounted on one side of the torque measuring component, and a constraint component is mounted on one side of the support component to limit the radial movement of the ball screw nut. The constraint component includes a base and a limit pin fixed to one side of the nut. The two bases are symmetrically fixed to the top of the chassis, and a support column is fixed on the base. An upper limit seat and a lower limit seat are mounted on the support column. An upper limit pin is engaged between the two upper limit seats, and a lower limit pin is engaged between the two lower limit seats. The upper limit pin and the lower limit pin cooperate to form a limiting channel for constraining the limit pin. The limiting channel restricts the circumferential rotation and radial movement of the nut and allows the limit pin to move along the screw axis. This utility model has the characteristic of avoiding errors in torque test data caused by nut movement.

Description

Technical Field

[0001] This utility model relates to the technical field of ball screw testing equipment, specifically a ball screw torque testing device. Background Technology

[0002] As a core component of precision transmission systems, the performance of ball screws directly determines the positioning accuracy, rigidity, and service life of mechanical equipment. Among these parameters, drive torque is one of the key parameters for evaluating ball screw performance. It comprehensively reflects the screw's friction characteristics, preload effect, lubrication status, and manufacturing and assembly quality. Abnormal torque not only increases energy consumption but may also lead to positioning deviations, vibration noise, or even transmission failure. Therefore, conducting accurate torque testing on ball screws is a necessary means to ensure their quality.

[0003] A published Chinese patent, publication number CN215767469U, discloses a measuring device for the friction torque of a ball screw pair, including a ball screw, a screw nut, and a torque measuring mechanism for detecting friction torque. The screw nut is screwed onto the outer periphery of the ball screw, and two support components are respectively disposed at both ends of the ball screw. The ball screw overlaps the support components, and the torque measuring mechanism is fixedly connected to the end of the ball screw.

[0004] In actual use, the torque measuring device provided by the disclosed patent is prone to axial movement of the nut along the axis perpendicular to the lead screw, which in turn damages the coaxiality of the lead screw axis with the support component and the torque measuring mechanism. The additional radial force generated during transmission causes the torque value captured by the torque sensor to be mixed with interference components, resulting in measurement data errors and misjudging the torque performance of the ball screw.

[0005] Therefore, it is necessary to design a ball screw torque testing device that avoids errors in torque test data caused by nut movement. Utility Model Content

[0006] The purpose of this invention is to provide a ball screw torque testing device to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a ball screw torque testing device, including a chassis and a control box and a test box located on the top of the chassis. The control box is equipped with a drive component, and the test box is equipped with a torque measuring component. A support component for clamping the ball screw under test is coaxially provided on one side of the torque measuring component. One side of the support assembly is provided with a constraint component to limit the radial movement of the ball screw nut; The constraint assembly includes a base and a limiting pin fixed to one side of the nut. The two bases are symmetrically fixed to the top of the chassis. A support column is fixed on the base. An upper limit seat and a lower limit seat are mounted on the support column. An upper limit pin is engaged between the two upper limit seats. A lower limit pin is engaged between the two lower limit seats. The upper limit pin and the lower limit pin cooperate to form a limiting channel for constraining the limiting pin. The limiting channel restricts the circumferential rotation and radial movement of the nut and allows the limiting pin to move axially along the lead screw.

[0008] In one embodiment of the present invention, the support assembly includes a fixed support, with sliders fixedly connected to the bottom of the fixed supports on both sides. A linear guide rail parallel to the axial direction of the ball screw is provided on the top of the housing. The sliders slide in cooperation with the linear guide rail, so that the fixed support moves along the linear guide rail to the required position to adapt to ball screws of different lengths.

[0009] In one embodiment of the present invention, a clamping seat is fixedly connected to the top of the fixed support, and a rotating shaft is provided on both sides of the top of the clamping seat. Several bearings are sleeved on the rotating shaft, and the bearings on both sides form a semi-enclosed positioning structure on the clamping seat to support the shaft end of the ball screw and make it rotate flexibly.

[0010] In one embodiment of this utility model, an extension plate may be optionally installed between the fixed support and the slider.

[0011] In one embodiment of the present invention, the drive assembly includes a servo motor and a motor mounting base, and the torque measuring assembly includes a torque sensor and a fixed base. The servo motor and the torque sensor are respectively fixed on the motor mounting base and the fixed base. The output end of the servo motor is connected to one end of the torque sensor through a coupling, and the other end of the torque sensor is connected to a ball screw through a coupling.

[0012] In one embodiment of the present invention, hinges are provided between the back sides of the test box and the chassis, and a support frame is fixedly provided on the back of the test box.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are: (1) By setting up a constraint component, the limit channel formed by the upper limit post and the lower limit post is used to double-constrain the limit pin fixed on one side of the nut. On the one hand, it can effectively limit the circumferential rotation and radial movement of the nut on the ball screw, avoid the deviation of the screw coaxiality caused by the nut offset or torsion during the test, ensure the stability of the relative movement of the nut and the screw, and avoid the torque measurement error caused by the nut movement. On the other hand, the limit channel reserves the free movement space of the limit pin along the screw axis, which does not interfere with the normal transmission of the ball screw at all, so that the test conditions are highly consistent with the actual working scene, further ensuring the authenticity and reliability of the torque test data. (2) By setting up a support component, in which the slider at the bottom of the fixed support slides with the linear guide rail at the top of the chassis, the fixed support can move along the guide rail to the required position, thereby flexibly adapting to ball screws of different lengths. There is no need to replace the clamping component or adjust the overall structure, which greatly improves the versatility of the testing device and reduces the equipment cost and preparation time when testing multi-specification screws. At the same time, an extension plate can be installed between the fixed support and the slider to further adapt to ball screws of different diameters or installation heights, enhancing the compatibility of the equipment. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structural composition of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This is a schematic diagram of the constraint component structure of this utility model; Figure 4 This is a schematic diagram of the support component of this utility model; Figure 5 This is a schematic diagram of the drive component and torque measuring component of this utility model; In the diagram: 10. Chassis; 11. Control box; 12. Test box; 121. Hinge; 13. Support frame; 20. Drive assembly; 21. Servo motor; 22. Motor mounting base; 30. Torque measuring assembly; 31. Torque sensor; 32. Fixing base; 40. Support assembly; 41. Fixed support; 42. Slider; 43. Linear guide rail; 44. Clamping seat; 45. Rotating shaft; 46. Bearing; 47. Heightening plate; 50. Constraint assembly; 51. Base; 52. Limit pin; 53. Support column; 54. Upper limit seat; 55. Lower limit seat; 56. Upper limit post; 57. Lower limit post; 58. Limit channel. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0016] This utility model provides a technical solution: a ball screw torque testing device, including a housing 10 and a control box 11 and a test box 12 located on the top of the housing 10. The control box 11 contains a drive assembly 20, and the test box 12 contains a torque measuring assembly 30. The drive assembly 20 includes a servo motor 21 and a motor mounting base 22. The torque measuring assembly 30 includes a torque sensor 31 and a fixed base 32. The servo motor 21 and the torque sensor 31 are respectively fixed on the motor mounting base 22 and the fixed base 32. The output end of the servo motor 21 is connected to one end of the torque sensor 31 via a coupling, and the other end of the torque sensor 31 is connected to the ball screw via a coupling. The servo motor 21 and the torque sensor... The device 31 is directly connected via a coupling, and both are fixed on the motor mounting base 22 and the fixed base 32 respectively, ensuring the coaxiality of the drive end and the torque measuring end. The servo motor 21 can provide stable and adjustable speed and torque output. With the high-precision torque sensor 31, it can capture the torque data of the ball screw under different working conditions in real time, ensuring the accuracy and reliability of the test results. The drive component 20 and the torque measuring component 30 are built into the control box 11 and the test box 12 respectively, which not only protects the core components from external environmental interference, but also makes the overall structure of the device compact and reduces the footprint. At the same time, the modular installation design facilitates the individual maintenance and replacement of components, reducing operation and maintenance costs.

[0017] The torque measuring assembly 30 is coaxially provided with a support assembly 40 for clamping the ball screw under test on one side. The support assembly 40 includes a fixed support 41, and sliders 42 are fixedly connected to the bottom of the fixed supports 41 on both sides. A linear guide rail 43 parallel to the axial direction of the ball screw is provided on the top of the housing 10. The sliders 42 and the linear guide rail 43 are slidably engaged, so that the fixed supports 41 can move along the linear guide rail 43 to the required position to adapt to ball screws of different lengths. The fixed supports 41 in the support assembly 40 are slidably engaged with the linear guide rail 43 on the top of the housing 10 through the sliders 42 at the bottom. The distance between the fixed supports 41 on both sides can be flexibly adjusted according to the length of the ball screw under test. Without changing the clamping structure or adjusting the overall layout, it can adapt to the testing needs of ball screws of different lengths and specifications, which greatly improves the versatility of the device and reduces the equipment cost and test preparation time in multi-variety ball screw testing scenarios.

[0018] The support assembly 40 has a constraint assembly 50 on one side to limit the radial movement of the ball screw nut. The constraint assembly 50 includes a base 51 and a limiting pin 52 fixed to one side of the nut. The two bases 51 are symmetrically fixed to the top of the housing 10. Support columns 53 are fixed on the bases 51. Upper limit seats 54 and lower limit seats 55 are mounted on the support columns 53. Upper limit pins 56 are engaged between the upper limit seats 54 on both sides, and lower limit pins 57 are engaged between the lower limit seats 55 on both sides. The upper limit pins 56 and lower limit pins 57 cooperate to form a limiting channel 58 for constraining the limiting pin 52. The limiting channel 58 restricts the circumferential rotation and radial movement of the nut and allows the limiting pin 52 to move along the screw axis. The constraint assembly 50 forms a limiting channel through the cooperation of the upper limit pins 56 and lower limit pins 57. Channel 58 constrains the limiting pin 52 fixed on one side of the nut. This design effectively restricts the circumferential rotation of the nut, ensuring the relatively stable movement of the nut and the lead screw during torque testing and avoiding torque measurement errors caused by nut rotation. It also prevents radial movement of the nut, reducing vibration of the lead screw during transmission and providing a stable mechanical environment for torque testing. This significantly improves the accuracy and reliability of the test data. While fulfilling its limiting function, channel 58 allows the limiting pin 52 to move freely along the axial direction of the lead screw without interfering with the normal linear transmission of the ball screw. This characteristic ensures that the motion state of the lead screw during testing is highly consistent with the actual working scenario, avoiding interference with transmission performance due to the limiting structure, and making the test results more accurately reflect the actual torque characteristics of the lead screw.

[0019] The top of the fixed support 41 is fixedly connected to a clamping seat 44. Rotating shafts 45 are passed through the top two sides of the clamping seat 44. Several bearings 46 are sleeved on the rotating shafts 45. The bearings 46 on both sides form a semi-enclosed positioning structure on the clamping seat 44 to support the shaft end of the ball screw and allow it to rotate flexibly. The bearings 46 on the rotating shafts 45 on both sides of the clamping seat 44 form a semi-enclosed positioning structure, which not only provides stable support for the shaft end of the ball screw, but also greatly reduces the frictional resistance and energy loss when the screw rotates through the rolling friction of the bearings 46. In addition, the semi-enclosed positioning structure achieves all-round constraint on the shaft end of the screw through multi-point contact, effectively limiting the radial movement and wobble of the shaft end, ensuring that the screw always maintains coaxiality with the drive assembly 20 and the torque measuring assembly 30 when rotating at high speed or with changing load, and can quickly complete the clamping without complicated alignment adjustment.

[0020] An extension plate 47 can be selectively installed between the fixed support 41 and the slider 42. By increasing or decreasing the number of extension plates 47, the overall height of the fixed support 41 and the clamping seat 44 can be flexibly adjusted, allowing the device to adapt to ball screws with different installation height requirements. Hinges 121 are provided between the back sides of the test box 12 and the chassis 10. The chassis 10 has a support frame 13 fixed on the back of the test box 12. The back sides of the test box 12 are connected to the chassis 10 through the hinges 121, allowing the test box 12 to be flipped open outward around the hinge point. The core components inside can be directly accessed without disassembling the entire box, greatly simplifying the maintenance, repair, and component replacement process of the device. The support frame 13 fixed on the chassis 10 provides stable support to the back of the test box 12 when it is opened.

[0021] Working principle: First, slide the fixed supports 41 on both sides along the linear guide rail 43 on the top of the chassis 10 and adjust them to the distance that matches the length of the lead screw. Then, by adding or removing the heightening plate 47 between the fixed support 41 and the slider 42, the height of the clamping seat 44 is aligned with the center height of the lead screw, ensuring that the lead screw is coaxial with the drive assembly 20 and the torque measuring assembly 30 after installation. One end of the ball screw is connected to the torque sensor 31 via a coupling, and the other end is placed on the semi-enclosed bearing 46 structure of the clamping seat 44. The bearing 46 provides support to achieve stable bearing and flexible rotation of the screw shaft end. At the same time, the limiting pin 52 fixed on one side of the ball screw nut is embedded in the limiting channel 58 of the constraint assembly 50. Through the cooperation of the upper limiting pin 56 and the lower limiting pin 57, the circumferential rotation and radial movement of the nut are restricted, without affecting the normal movement of the nut along the screw axis. After the test is started, the control box 11 sends a control command to the servo motor 21 of the drive assembly 20. The servo motor 21 outputs a stable and adjustable speed and torque according to the preset parameters. The power is transmitted to the torque sensor 31 through the coupling, and then transmitted to the ball screw under test by the torque sensor 31, driving the screw to rotate. The nut moves linearly along the screw axis. The torque generated by the screw during the transmission process is captured in real time by the torque sensor 31 and converted into an electrical signal, which is transmitted to the control system of the control box 11 for data processing, analysis and display.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or specific orientation structure and operation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] In the description of this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this utility model without contradiction.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A ball screw torque testing device, comprising a chassis (10) and a control box (11) and a test box (12) disposed on the top of the chassis (10), wherein the control box (11) is provided with a drive assembly (20) and the test box (12) is provided with a torque measuring assembly (30), and a support assembly (40) for clamping the ball screw under test is coaxially disposed on one side of the torque measuring assembly (30). characterized in that The support assembly (40) is provided with a constraint assembly (50) on one side to limit the radial movement of the ball screw nut. The constraint assembly (50) includes a base (51) and a limiting pin (52) fixed on one side of the nut. The bases (51) on both sides are symmetrically fixed on the top of the chassis (10). Support columns (53) are fixed on the bases (51). Upper limit seats (54) and lower limit seats (55) are mounted on the support columns (53). Upper limit posts (56) are engaged between the upper limit seats (54) on both sides. Lower limit posts (57) are engaged between the lower limit seats (55) on both sides. The upper limit posts (56) and lower limit posts (57) cooperate to form a limiting channel (58) for constraining the limiting pin (52). The limiting channel (58) restricts the circumferential rotation and radial movement of the nut and allows the limiting pin (52) to move axially along the lead screw.

2. The ball screw torque testing device of claim 1, wherein: The support assembly (40) includes a fixed support (41), and sliders (42) are fixedly connected to the bottom of the fixed supports (41) on both sides. A linear guide (43) parallel to the axis of the ball screw is provided on the top of the housing (10). The sliders (42) slide with the linear guide (43) to allow the fixed support (41) to move along the linear guide (43) to the required position to adapt to ball screws of different lengths.

3. The ball screw torque testing device according to claim 2, characterized in that: The top of the fixed support (41) is fixedly connected to a clamping seat (44). Rotating shafts (45) are provided on both sides of the top of the clamping seat (44). Several bearings (46) are sleeved on the rotating shafts (45). The bearings (46) on both sides form a semi-enclosed positioning structure on the clamping seat (44) to support the shaft end of the ball screw and make it rotate flexibly.

4. The ball screw torque testing device of claim 3, wherein: An extension plate (47) may be optionally installed between the fixed support (41) and the slider (42).

5. The ball screw torque testing device according to claim 1, characterized in that: The drive assembly (20) includes a servo motor (21) and a motor mounting base (22). The torque measuring assembly (30) includes a torque sensor (31) and a fixed base (32). The servo motor (21) and the torque sensor (31) are respectively fixed on the motor mounting base (22) and the fixed base (32). The output end of the servo motor (21) is connected to one end of the torque sensor (31) through a coupling. The other end of the torque sensor (31) is connected to the ball screw through a coupling.

6. The ball screw torque testing device according to claim 1, characterized in that: The test box (12) has hinges (121) on both sides of its back and the chassis (10), and the chassis (10) has a support frame (13) fixed on the back of the test box (12).

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