Ball screw efficiency detection device

Abstract

The utility model discloses an efficiency detection device for a ball screw. The efficiency detection device comprises a machine table, a servo motor, a chuck, a movable seat and a hydraulic load, the movable seat can slide along the length direction of the machine table, a lower connecting seat and an upper connecting seat are fixed on the movable seat, the upper connecting seat is detachably fixed, an accommodating space for accommodating a nut of the ball screw is formed between the upper connecting seat and the lower connecting seat, and a limiting structure is arranged in the accommodating space; the chuck is pivoted on the machine table; the servo motor is used for driving the chuck to rotate so that a screw of the ball screw can rotate along with the chuck, and a torque rotating speed sensor is connected between an output shaft of the servo motor and the chuck. The hydraulic load is installed on the machine table, and a pull pressure sensor is arranged between the hydraulic load and the movable seat. According to the utility model, the detection environment where the ball screw is located accords with the actual use scene, and the detection precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ball screws, in particular to a ball screw efficiency detection device. Background Art

[0002] As a transmission component, the ball screw converts the rotational motion output by the servo motor into the linear motion of the driven part. The ball screw is composed of a screw, a roller and a nut, and has the advantages of high precision and high efficiency. Since the ball screw is usually used in industrial equipment and precision instruments, it is required to have high precision. Therefore, it is necessary to test the efficiency of the ball screw to determine whether it is a qualified product. The efficiency test of the ball screw is to calculate the efficiency of the ball screw by the input power loaded on the ball screw by the servo motor and the output power of the ball screw. The current detection device usually drives the screw of the ball screw to rotate by the servo motor, drives the slider to move by the nut, and loads the slider. After the ball screw is installed on the detection device, there is an installation gap between the ball screw and the detection device. When the servo motor is started to start the detection, the input power loaded by the servo motor on the ball screw will be used to push the slider to move after eliminating the installation gap between the ball screw and the detection device. This is inconsistent with the actual use scenario of the roller screw, resulting in inaccurate values ​​obtained by the detection. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model aims to provide a ball screw efficiency detection device, which can improve the detection accuracy.

[0004] The purpose of the utility model is achieved by the following technical solutions:

[0005] The first aspect of the utility model provides a ball screw efficiency detection device, which includes a machine platform, a servo motor, a chuck, a movable seat, and a hydraulic load;

[0006] The movable seat is mounted on the machine platform and can slide along the length direction of the machine platform, a lower connecting seat and an upper connecting seat are fixed thereon, the upper connecting seat is located above the lower connecting seat and is detachably fixed to the lower connecting seat, an accommodating space for accommodating a nut of a ball screw is formed between the upper connecting seat and the lower connecting seat, and a limiting structure is provided in the accommodating space to prevent the nut of the ball screw from rotating relative to the movable seat and moving relative to the movable seat along the length direction of the machine platform;

[0007] The chuck is pivotally connected to the machine platform, and is provided with a plurality of claws for clamping the screw of the ball screw;

[0008] The servo motor is used to drive the chuck to rotate so that the screw of the ball screw rotates along with the chuck, and a torque speed sensor is connected between the output shaft of the servo motor and the chuck;

[0009] The hydraulic load is installed on the machine platform, and a tension pressure sensor is arranged between the hydraulic load and the movable seat.

[0010] According to the ball screw efficiency detection device of the embodiment of the utility model, when detecting the efficiency of the ball screw, the servo motor drives the screw of the ball screw to rotate, so that the nut of the ball screw pushes or pulls the movable seat to slide along the length direction of the machine platform, and work is done on the hydraulic load when the movable seat slides along the length direction of the machine platform. The driving torque and angular velocity of the servo motor when driving the screw to rotate are detected by the torque speed sensor, and the input power Pin is calculated. The pull pressure sensor detects the magnitude of the force applied by the movable seat to the hydraulic load, as well as the translational speed of the movable seat (the translational speed can be calculated by detecting the displacement of the movable seat and the translational time of the movable seat), and the output power Pout of the ball screw is calculated. The transmission efficiency η of the ball screw is calculated according to the formula: η=Pout / Pin.

[0011] The driving torque T when the servo motor drives the screw to rotate is detected by the torque speed sensor, and the theoretical flat force F is calculated according to the formula: F=T*2π / P (where P is the lead of the ball screw). The force Fn applied by the movable seat to the hydraulic load is detected by the tension pressure sensor, and the ball screw torque-to-flat force conversion efficiency η1 is calculated according to the formula: η1=Fn / F.

[0012] In the utility model, the nut of the ball screw is accommodated in the accommodating space formed between the lower connecting seat and the upper connecting seat on the movable seat. After the nut is placed on the lower connecting seat from top to bottom, the upper connecting seat is fixed on the lower connecting seat so that the nut is placed in the accommodating space, which is convenient for installing the nut on the movable seat. The screw of the ball screw is clamped by a chuck, so that the nut can be conveniently and quickly installed on the detection device. In addition, a limiting structure is provided in the accommodating space to prevent the nut of the ball screw from rotating relative to the movable seat and moving relative to the movable seat along the length direction of the machine. During the test, the servo motor is started, and the ball screw is promptly driven by the servo motor to work on the load, so that the detection environment of the ball screw is consistent with the actual usage scenario, and the value measured by the torque and speed sensor is more accurate, thereby obtaining a more accurate transmission efficiency, thereby improving the detection accuracy.

[0013] In the first aspect of the utility model, as an optional embodiment, the lower surface of the upper connecting seat is recessed upward to form an upper groove, and the lower surface of the lower connecting seat is recessed downward to form a lower groove, and the upper groove and the lower groove together constitute the accommodating space; the limiting structure includes a protruding rib arranged on the inner wall of the lower groove and / or the inner wall of the upper groove, and a limiting end wall located at both ends of the lower groove and the upper groove, the rib is embedded in the keyway on the nut of the ball screw to prevent the nut of the ball screw from rotating relative to the movable seat, and the two ends of the nut of the ball screw respectively abut against the limiting end walls at both ends of the lower groove and the upper groove to prevent the nut of the ball screw from moving relative to the movable seat along the length direction of the machine. By arranging convex ribs matching the keyways of the nut in the lower groove and / or the upper groove, the nut is prevented from rotating relative to the upper connecting seat and the lower connecting seat. The limiting end walls at both ends of the upper groove and the lower groove cooperate with the two end surfaces of the nut to prevent the nut from moving relative to the upper connecting seat and the lower connecting seat along the length direction of the machine, thereby avoiding the existence of relative rotation and translation gaps between the nut and the movable seat.

[0014] In the first aspect of the utility model, as an optional embodiment, a sleeve is fixedly connected to the machine platform, a connecting shaft is inserted into the sleeve and pivotally connected to the sleeve through a bearing, one end of the connecting shaft is provided with a flange located outside one end of the sleeve, the other end of the connecting shaft is connected to one end of the torque speed sensor through a first coupling, the other end of the torque speed sensor is connected to the output shaft of the servo motor through a second coupling, and the chuck is fixedly connected to the flange. The power output of the servo motor is transmitted to the screw of the ball screw through the connecting shaft on the machine platform, and the chuck is connected to the connecting shaft by using the flange on the connecting shaft, so as to reduce the power loss between the servo motor and the ball screw and further improve the detection accuracy.

[0015] In the first aspect of the utility model, as an optional embodiment, the bearing includes a first bearing located at one end of the sleeve and a second bearing located at the other end of the sleeve, a sleeve is provided on the connecting shaft and supported between the first bearing inner ring and the second bearing inner ring, the flange is against the outer end of the first bearing inner ring, a locking nut is threaded on the other end of the connecting shaft, a limiting washer is clamped between the locking nut and the outer end of the second bearing inner ring, the limiting washer is provided with a limiting plate located on its inner edge and a locking plate located on its outer edge, a keyway is provided on the connecting shaft for the limiting plate to be embedded, and a plurality of slots are provided on the locking nut arranged along its circumference, and the locking plate is embedded in one of the slots to prevent the locking nut from rotating relative to the limiting washer. By utilizing the locking nut and locking plate at the end of the connecting shaft, when the locking nut is tightened, the locking plate forms a stop structure between the locking nut and the connecting shaft, thereby preventing the locking nut from loosening. At the same time, the locking nut can compress the bearing clearance of the first bearing and the second bearing as much as possible, thereby avoiding the bearing clearance from affecting the rotation of the connecting shaft, so that the rotational kinetic energy output by the servo motor can be transmitted to the screw of the ball screw as much as possible, so that the test environment of the ball screw is consistent with the actual usage scenario.

[0016] In the first aspect of the utility model, as an optional embodiment, a base plate is provided on the machine platform, and the base plate is fixed to the machine platform in an adjustable manner along the length direction of the machine platform, and a first mounting seat and a second mounting seat staggered along the length direction of the machine platform are fixed to the base plate, the torque speed sensor is installed on the first mounting seat, the sleeve is fixed on the second mounting seat, and the body of the servo motor is fixed on the base plate. The servo motor, torque speed sensor, connecting shaft, and chuck are arranged on the base plate, and the base plate is fixed to the machine platform in an adjustable manner, so that the overall module composed of the servo motor, torque speed sensor, connecting shaft, and chuck can be adjusted according to the actual detection needs of the ball screw, thereby simplifying the installation process of the ball screw.

[0017] In the first aspect of the utility model, as an optional embodiment, the hydraulic load includes a hydraulic cylinder, an oil pot, and a steel cylinder. The hydraulic cylinder includes a cylinder body fixed on the machine platform and a piston installed in the cylinder body. The piston divides the inner cavity of the hydraulic cylinder into a first chamber close to the movable seat and a second chamber away from the movable seat. The pull and pressure sensor is connected between the piston of the hydraulic cylinder and the movable seat. The steel cylinder is used to communicate with the second chamber when the movable seat pushes the piston to move, and to communicate with the first chamber when the movable seat pulls the piston to move. The oil pot is used to replenish hydraulic oil into the first chamber when the movable seat pushes the piston to move, and to replenish hydraulic oil into the second chamber when the movable seat pulls the piston to move. A hydraulic load is used as the work object of the ball screw. When building the hydraulic load, the hydraulic load can be adjusted to produce a corresponding stroke when subjected to a preset pressure by adjusting the number and size of the cylinders. In this way, the thrust / pull-stroke curve of the hydraulic load can be adjusted accordingly according to the design parameters of the ball screw. Compared with the existing detection device using an electric cylinder as a load, it does not need to adopt a more complex software design and a complex structure, and can adjust the load required by the ball screw to be tested, thereby simplifying the structure of the detection device and reducing the difficulty of operating the detection device. In addition, in actual use, when the piston movement reduces the volume of the first chamber and the second chamber, The steel cylinder is connected to the first chamber or the second chamber to form a larger pressure chamber, so that the lateral movement of the piston can cause a negligible change in the volume of the larger pressure chamber. Therefore, during the movement of the piston, the pressure applied by the first chamber or the second chamber to the piston will not change significantly, that is to say, the force exerted by the load on the movable seat is almost constant, and the pressure or tension between the movable seat and the load measured by the tension and pressure sensor is more accurate and direct, which improves the test accuracy, and there is no need to use complex correction structures and programs to calculate the actual interaction force between the movable seat and the load.

[0018] In the first aspect of the utility model, as an optional embodiment, the hydraulic load also includes a first solenoid valve and a second solenoid valve, the first chamber and the oil pot, the first chamber and the steel cylinder, the second chamber and the oil pot, and the second chamber and the steel cylinder are all connected through pipelines, the first solenoid valve is connected to the pipeline between the second chamber and the steel cylinder, and the second solenoid valve is connected to the pipeline between the second chamber and the oil pot. Through the external signal of the solenoid valve, the automation and remote control of the hydraulic load can be realized, and the test efficiency and convenience are improved, especially when the motor rotates forward to complete the thrust test, the first solenoid valve and the second solenoid valve can be quickly controlled, and the motor can be reversed to perform the tension test, so that the load can adapt to the switching of the ball screw forward push and reverse pull test.

[0019] In the first aspect of the utility model, as an optional embodiment, the piston includes a piston disk located inside the cylinder body and a piston rod extending from the cylinder body, the piston rod divides the inner cavity of the cylinder body into a first chamber and a second chamber, the piston rod is tightly matched with the cylinder body, a connecting cavity is formed between the inner wall of the cylinder body and the outer peripheral surface of the piston rod, a connecting hole is provided on the piston rod, and the two openings of the connecting hole formed on the outer peripheral surface of the piston rod are staggered along the axial direction of the piston rod, the two openings of the connecting hole respectively connect the connecting cavity and the first chamber to conduct the connecting cavity and the first chamber, and the pipeline for connecting the first chamber and the oil pot is connected between the connecting cavity and the oil pot. By utilizing the connecting holes with two openings of the piston rod staggered from each other, the first chamber can be connected with the connecting chamber. When the motor reverses to perform a tensile test on the ball screw, the piston disc can move outward to the extreme position as far as possible to drain the hydraulic oil in the first chamber as much as possible. At the same time, when the motor rotates forward to perform a thrust test, the piston disc squeezes the second chamber, and the hydraulic oil in the oil pot can enter the first chamber through the connecting chamber and the connecting hole in time, thereby enabling the hydraulic system to quickly adapt to the switching between the forward push and reverse pull tests of the ball screw.

[0020] In the first aspect of the utility model, as an optional embodiment, a mounting plate is fixed to the upper shell of the machine platform for disassembly, the cylinder body of the hydraulic cylinder is fixed on an adjustment seat located above the mounting plate, the mounting plate is provided with a slide groove extending along the length direction of the machine platform, the adjustment seat is provided with a convex block slidably embedded in the slide groove, and the adjustment seat and the mounting plate are fastened together by locking bolts. The mounting plate is used to adjust the position of the hydraulic cylinder on the machine platform, so that the position of the hydraulic cylinder in the length direction of the machine platform can adapt to the detection requirements of the ball screw, and together with the number and size of the cylinders and other parameters, the hydraulic load can be flexibly adjusted.

[0021] In the first aspect of the utility model, as an optional embodiment, a mounting frame is fixed on the machine platform, the oil pot is fixed on the mounting frame, and the height of the oil pot is higher than the height of the hydraulic cylinder so that the hydraulic oil in the oil pot can flow into the first chamber or the second chamber by its own gravity. The mounting frame is used to install the oil pot at a position with a height greater than that of the hydraulic cylinder, and the hydraulic oil in the oil pot can flow into the first chamber or the second chamber by its own gravity, so that the hydraulic oil is replenished in the first chamber and the second chamber in time, simplifying the structure of the hydraulic load. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 It is a schematic diagram of the structure of the utility model;

[0024] Figure 2 for Figure 1 AA section view;

[0025] Figure 3 for Figure 2 Magnified view at B in the middle;

[0026] Figure 4 for Figure 1 Structural schematic diagram of the middle movable seat;

[0027] Figure 5 for Figure 4 Structural schematic diagram of the middle and upper connecting seat;

[0028] Figure 6 for Figure 2 Installation diagram of the middle connecting shaft;

[0029] Figure 7 for Figure 1 Structural diagram of the hydraulic load;

[0030] Figure 8 for Figure 7 CC section view;

[0031] Fig. 9 This is a working schematic diagram of the hydraulic load of the utility model.

[0032] In the figure: 10, machine table; 11, bottom plate; 12, first mounting seat; 13, second mounting seat; 14, mounting frame; 20, motor; 21, first coupling; 30, chuck; 31, claw; 40, movable seat; 41, lower connecting seat; 411, lower groove; 412, limit end wall; 42, upper connecting seat; 421, upper groove; 422, convex rib; 423, limit end wall; 50, hydraulic load; 51, hydraulic cylinder; 511, cylinder body; 5111, first chamber; 5112, second chamber; 5113, connecting chamber; 512, piston; 5121, piston rod; 5122, piston disc; 5123, connecting hole; 5124, opening; 52, oil pot; 53, first solenoid valve; 54, second solenoid valve; 55, adjustment seat; 551, bump; 56, mounting plate; 561, slide groove; 57, cylinder; 60, torque and speed sensor; 61, second coupling; 70, tension and pressure sensor; 81, bushing; 82, connecting shaft; 83, first bearing; 84, second bearing; 85, bushing; 86, locking nut; 87, limiting washer; 871, limiting plate; 872, locking plate; 91, screw; 92, nut; 921, keyway. DETAILED DESCRIPTION

[0033] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except for special instructions, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "plurality" means two or more, unless otherwise precisely and specifically specified.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be connected through an intermediary medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0037] Please refer to Figure 1-9 As shown, an embodiment of the utility model provides a ball screw efficiency detection device, which includes a machine platform 10, a servo motor 20, a chuck 30, a movable seat 40, and a hydraulic load 50;

[0038] The movable seat 40 is installed on the machine table 10 and can slide along the length direction of the machine table 10, and a lower connecting seat 41 and an upper connecting seat 42 are fixed thereon, and the upper connecting seat 42 is located above the lower connecting seat 41 and is detachably fixed to the lower connecting seat 41, and a receiving space for accommodating a nut 92 of a ball screw is formed between the upper connecting seat 42 and the lower connecting seat 41, and a limiting structure is provided in the receiving space to prevent the nut 92 of the ball screw from rotating relative to the movable seat 40 and moving relative to the movable seat 40 along the length direction of the machine table 10; the detachable connection between the upper connecting seat 42 and the lower connecting seat 41 can be achieved by bolt connection;

[0039] The chuck 30 is pivotally connected to the machine platform 10 and is provided with a plurality of claws 31 for clamping the screw 91 of the ball screw;

[0040] The servo motor 20 is used to drive the chuck 30 to rotate so that the screw 91 of the ball screw rotates along with the chuck 30. A torque speed sensor 60 is connected between the output shaft of the servo motor 20 and the chuck 30.

[0041] The hydraulic load 50 is installed on the machine platform 10 , and a tension pressure sensor 70 is disposed between the hydraulic load 50 and the movable seat 40 .

[0042] According to the ball screw efficiency detection device of the embodiment of the utility model, when detecting the efficiency of the ball screw, the servo motor 20 drives the screw 91 of the ball screw to rotate, so that the nut 92 of the ball screw pushes or pulls the movable seat 40 to slide along the length direction of the machine table 10 (i.e., the X direction in the figure), and when the movable seat 40 slides along the length direction of the machine table 10, work is done on the hydraulic load 50. The torque speed sensor 60 detects the driving torque and angular velocity when the servo motor 20 drives the screw 91 to rotate, and the input power Pin is calculated. The pull pressure sensor 70 detects the magnitude of the force applied by the movable seat 40 to the hydraulic load 50, as well as the translation speed of the movable seat 40 (the translation speed can be calculated by detecting the displacement of the movable seat 40 and the translation time of the movable seat 40), and the output power Pout of the ball screw is calculated. According to the formula: η=Pout / Pin, the transmission efficiency η of the ball screw is calculated.

[0043] The driving torque T when the servo motor 20 drives the screw 91 to rotate is detected by the torque speed sensor 60, and the theoretical flat force F is calculated according to the formula: F=T*2π / P (where P is the lead of the ball screw); the force Fn applied by the movable seat 40 to the hydraulic load 50 is detected by the tension pressure sensor 70, and the ball screw torque-to-flat force conversion efficiency η1 is calculated according to the formula: η1=Fn / F.

[0044] During the test, the servo motor 20 rotates forward, causing the nut 92 to move from front to back, the hydraulic load 50 to be compressed, and the thrust test is completed after the nut 92 travels one lead; then the servo motor 20 rotates reversely, causing the nut 92 to move from back to front, the hydraulic load to be pulled, and the tension test is completed after the nut 92 travels one lead.

[0045] In the utility model, the nut 92 of the ball screw is accommodated in the accommodation space formed between the lower connecting seat 41 and the upper connecting seat 42 on the movable seat 40. After the nut 92 is placed on the lower connecting seat 41 from top to bottom, the upper connecting seat 42 is fixed on the lower connecting seat 41 so that the nut 92 is placed in the accommodation space, which is convenient for installing the nut 92 on the movable seat 40. The chuck 30 is used to clamp the screw 91 of the ball screw, so that the nut 92 can be conveniently and quickly installed on the detection device. In addition, a limiting structure is provided in the accommodation space to prevent the nut 92 of the ball screw from rotating relative to the movable seat 40 and moving relative to the movable seat 40 along the length direction of the machine platform 10. During the test, the servo motor 20 is started, and the ball screw is promptly driven by the servo motor 20 to work on the load, so that the detection environment of the ball screw is consistent with the actual usage scenario, and the value measured by the torque speed sensor 60 is more accurate, thereby obtaining a more accurate transmission efficiency, thereby improving the detection accuracy.

[0046] In a preferred embodiment of the present utility model, the lower surface of the upper connecting seat 42 is recessed upward to form an upper groove 421, and the lower surface of the lower connecting seat 41 is recessed downward to form a lower groove 411, and the upper groove 421 and the lower groove 411 together constitute the accommodating space; the limiting structure includes a convex rib 422 protrudingly arranged on the inner wall of the lower groove 411 and / or the inner wall of the upper groove 421, and limiting end walls 412 and 423 located at both ends of the lower groove 411 and the upper groove 421, the convex rib 422 is embedded in the keyway on the nut 92 of the ball screw to prevent the nut 92 of the ball screw from rotating relative to the movable seat 40, and the two ends of the nut 92 of the ball screw respectively abut against the limiting end walls 412 and 423 at both ends of the lower groove 411 and the upper groove 421 to prevent the nut 92 of the ball screw from moving relative to the movable seat 40 along the length direction of the machine table 10. By providing a rib 422 matching the keyway of the nut 92 in the lower groove 411 and / or the upper groove 421, the nut 92 is prevented from rotating relative to the upper connecting seat 42 and the lower connecting seat 41. The limiting end walls 423 and 412 at both ends of the upper groove 421 and the lower groove 411 cooperate with the two end surfaces of the nut 92 to prevent the nut 92 from moving relative to the upper connecting seat 42 and the lower connecting seat 41 along the length direction of the machine 10, thereby avoiding the existence of a relative rotation and translation gap between the nut 92 and the movable seat 40.

[0047] In a preferred embodiment of the utility model, a sleeve 81 is fixedly connected to the machine 10, a connecting shaft 82 is inserted into the sleeve 81 and pivotally connected to the sleeve 81 through a bearing, one end of the connecting shaft 82 is provided with a flange located outside one end of the sleeve 81, the other end of the connecting shaft 82 is connected to one end of the torque speed sensor 60 through a first coupling 21, the other end of the torque speed sensor is connected to the output shaft of the servo motor 20 through a second coupling 61, and the chuck 30 is fixedly connected to the flange. The power output of the servo motor 20 is transmitted to the screw 91 of the ball screw through the connecting shaft 82 on the machine 10, and the chuck 30 is connected to the connecting shaft 82 by using the flange on the connecting shaft 82, so as to reduce the power loss between the servo motor 20 and the ball screw, and further improve the detection accuracy.

[0048] In a preferred embodiment of the utility model, the bearing includes a first bearing 83 located at one end of the sleeve 81 and a second bearing 84 located at the other end of the sleeve 81. The connecting shaft 82 is provided with a sleeve 85 supported between the inner ring of the first bearing 83 and the inner ring of the second bearing 84. The flange is against the outer end of the inner ring of the first bearing 83. The other end of the connecting shaft 82 is threaded with a locking nut 9286. A limiting washer 87 is clamped between the locking nut 92 and the outer end of the inner ring of the second bearing 84. The limiting washer 87 is provided with a limiting plate 871 located on its inner edge and a locking plate 872 located on its outer edge. The connecting shaft 82 is provided with a keyway for the limiting plate 871 to be embedded. The locking nut 9286 is provided with a plurality of slots arranged along its circumference. The locking plate 872 is embedded in one of the slots to prevent the locking nut 9286 from rotating relative to the limiting washer 87. By utilizing the cooperation of the locking nut 9286 and the locking plate 872 at the end of the connecting shaft 82, when the locking nut 9286 is tightened, the locking plate 872 forms a stop structure between the locking nut 9286 and the connecting shaft 82, thereby preventing the locking nut 9286 from loosening. At the same time, the locking nut 9286 can compress the bearing clearance of the first bearing 83 and the second bearing 84 as much as possible, thereby preventing the bearing clearance from affecting the rotation of the connecting shaft 82, so that the rotational kinetic energy output by the servo motor 20 can be transmitted to the screw 91 of the ball screw as much as possible, so that the test environment of the ball screw is consistent with the actual usage scenario.

[0049] In a preferred embodiment of the utility model, a base plate 11 is provided on the machine 10, and the base plate 11 is fixed on the machine 10 in an adjustable manner along the length direction of the machine 10. A first mounting seat 12 and a second mounting seat 13 staggered along the length direction of the machine 10 are fixed on the base plate 11, the torque speed sensor 60 is mounted on the first mounting seat 12, the sleeve 81 is fixed on the second mounting seat 13, and the body of the servo motor 20 is fixed on the base plate 11. The servo motor 20, the torque speed sensor 60, the connecting shaft 82, and the chuck 30 are arranged on the base plate 11, and the base plate 11 is fixed on the machine 10 in an adjustable manner, so that the overall module composed of the servo motor 20, the torque speed sensor 60, the connecting shaft 82, and the chuck 30 can be adjusted according to the actual detection needs of the ball screw, thereby simplifying the installation process of the ball screw.

[0050] In a preferred embodiment of the utility model, the hydraulic load 50 includes a hydraulic cylinder 51, an oil pot 52, and a steel cylinder 57. The hydraulic cylinder 51 includes a cylinder body 511 fixed on the machine platform 10, and a piston 512 installed in the cylinder body 511. The piston 512 divides the inner cavity of the hydraulic cylinder 51 into a first chamber 5111 close to the movable seat 40 and a second chamber 5112 away from the movable seat 40. The tension and pressure sensor 70 is connected between the piston 512 of the hydraulic cylinder 51 and the movable seat 40. The steel cylinder 57 is used to communicate with the second chamber 5112 when the movable seat 40 pushes the piston 512 to move, and to communicate with the first chamber 5111 when the movable seat 40 pulls the piston 512 to move. The oil pot 52 is used to replenish hydraulic oil into the first chamber 5111 when the movable seat 40 pushes the piston 512 to move, and to replenish hydraulic oil into the second chamber 5112 when the movable seat 40 pulls the piston 512 to move. The hydraulic load 50 is used as the work object of the ball screw. When the hydraulic load 50 is constructed, the corresponding stroke of the hydraulic load 50 when subjected to a preset pressure can be adjusted by adjusting the number and size of the steel cylinder 57. In this way, the thrust / pull-stroke curve of the hydraulic load 50 can be adjusted accordingly according to the design parameters of the ball screw. Compared with the existing detection device using an electric cylinder as a load, it is not necessary to use a more complex software design and a complex structure, and the load required for the ball screw to be tested can be adjusted, thereby simplifying the structure of the detection device and reducing the difficulty of operating the detection device. In addition, in actual use, when the piston 512 moves to reduce the volume of the first chamber 5111 and the second chamber 5112, due to the steel cylinder 57 and the first chamber 51 11 or the second chamber 5112 is connected, and is connected with the first chamber 5111 or the second chamber 5112 through the steel cylinder 57 to form a larger pressure chamber, so that the lateral movement of the piston 512 can cause a negligible change in the volume of the larger pressure chamber, so that during the movement of the piston 512, the pressure applied by the first chamber 5111 or the second chamber 5112 to the piston 512 will not change significantly, that is to say, the force exerted by the load on the movable seat 40 is almost constant, and the pressure or tension between the movable seat 40 and the load measured by the tension and pressure sensor 70 is more accurate and direct, thereby improving the test accuracy, and there is no need to use a complex correction structure and program to calculate the actual value of the interaction force between the movable seat 40 and the load.

[0051] In a preferred embodiment of the utility model, the hydraulic load 50 further includes a first solenoid valve 53 and a second solenoid valve 54. The first chamber 5111 and the oil pot 52, the first chamber 5111 and the steel cylinder 57, the second chamber 5112 and the oil pot 52, and the second chamber 5112 and the steel cylinder 57 are all connected through pipelines. The first solenoid valve 53 is connected to the pipeline between the second chamber 5112 and the steel cylinder 57, and the second solenoid valve 54 is connected to the pipeline between the second chamber 5112 and the oil pot 52. Through the external signal of the solenoid valve, the automation and remote control of the hydraulic load 50 can be realized, and the test efficiency and convenience are improved. In particular, when the motor 20 rotates forward to complete the thrust test, the first solenoid valve 53 and the second solenoid valve 54 can be quickly controlled, and the motor 20 can be reversed to perform the tension test, so that the load can adapt to the switching of the forward push and reverse pull tests of the ball screw.

[0052] In a preferred embodiment of the present invention, the piston 512 includes a piston 512 plate located inside the cylinder 511 and a piston 512 rod extending from the cylinder 511, the piston 512 rod divides the inner cavity of the cylinder 511 into a first chamber 5111 and a second chamber 5112, the piston 512 rod is tightly matched with the cylinder 511, and a connecting cavity 5113 is formed between the inner wall of the cylinder 511 and the outer peripheral surface of the piston 512 rod. A connecting hole 5123 is provided on the piston rod 512. The two openings 5124 formed on the outer peripheral surface of the piston rod 512 are staggered along the axial direction of the piston rod 512. The two openings 5124 of the connecting hole are connected to the connecting cavity 5113 and the first chamber 5111 respectively to conduct the connecting cavity 5113 and the first chamber 5111. The pipeline for connecting the first chamber 5111 and the oil pot 52 is connected between the connecting cavity 5113 and the oil pot 52. Two sealing cups may be installed between the cylinder body 511 and the piston rod 512. The two sealing cups are respectively located at both sides of the connecting cavity 5113. The two sealing cups can not only realize the sealing of the cylinder body 511 and the piston rod 512, but also seal both sides of the connecting cavity 5113 respectively. By utilizing the connecting holes with two openings 5124 of the piston 512 rod staggered from each other, the first chamber 5111 can be connected with the connecting chamber 5113. When the motor 20 reverses to perform a tensile test on the ball screw, the piston 512 plate can be moved outward to the extreme position as far as possible to drain the hydraulic oil in the first chamber 5111 as much as possible. At the same time, when the motor 20 rotates forward to perform a thrust test, the piston 512 plate squeezes the second chamber 5112, and the hydraulic oil in the oil pot 52 can enter the first chamber 5111 in time through the connecting chamber 5113 and the connecting hole, thereby enabling the hydraulic system to quickly adapt to the switching between the forward push and reverse pull tests of the ball screw.

[0053] In a preferred embodiment of the utility model, a mounting plate 56 is fixed to the upper shell of the machine 10, and the cylinder body 511 of the hydraulic cylinder 51 is fixed to an adjustment seat 55 located above the mounting plate 56. The mounting plate 56 is provided with a slide groove 561 extending along the length direction of the machine 10, and the adjustment seat 55 is provided with a convex block 551 slidably embedded in the slide groove 561. The adjustment seat 55 and the mounting plate 56 are fastened together by locking bolts. The mounting plate 56 is used to adjust the position of the hydraulic cylinder 51 on the machine 10, so that the position of the hydraulic cylinder 51 in the length direction of the machine 10 can adapt to the detection requirements of the ball screw, and together with the number and size of the cylinder 57 and other parameters, the hydraulic load 50 can be flexibly adjusted.

[0054] In a preferred embodiment of the utility model, a mounting frame 14 is fixed on the machine 10, and the oil pot 52 is fixed on the mounting frame 14. The height of the oil pot 52 is higher than the height of the hydraulic cylinder 51 so that the hydraulic oil in the oil pot 52 can flow into the first chamber 5111 or the second chamber 5112 by its own gravity. The mounting frame 14 is used to mount the oil pot 52 at a position with a height greater than that of the hydraulic cylinder 51, and the hydraulic oil in the oil pot 52 can flow into the first chamber 5111 or the second chamber 5112 by its own gravity, so that the hydraulic oil is replenished in the first chamber 5111 and the second chamber 5112 in time, thereby simplifying the structure of the hydraulic load 50.

[0055] Although only certain components and embodiments of the present application have been illustrated and described, many modifications and changes may be conceived by those skilled in the art without actually departing from the scope and spirit of the claims, such as changes in the size, dimensions, structure, shape and proportion of the various elements, mounting arrangements, material usage, color, orientation, etc.

[0056] The above-mentioned implementation mode is only a preferred implementation mode of the embodiment of the utility model, and cannot be used to limit the scope of protection of the embodiment of the utility model. Any non-substantial changes and replacements made by technical personnel in this field on the basis of the embodiment of the utility model shall fall within the scope of protection required by the embodiment of the utility model.

Claims

1. A ball screw efficiency detection device, characterized in that: Including machine table, servo motor, chuck, movable seat, and hydraulic load; The movable seat is mounted on the machine platform and can slide along the length direction of the machine platform, a lower connecting seat and an upper connecting seat are fixed thereon, the upper connecting seat is located above the lower connecting seat and is detachably fixed to the lower connecting seat, an accommodating space for accommodating a nut of a ball screw is formed between the upper connecting seat and the lower connecting seat, a limiting structure is provided in the accommodating space to prevent the nut of the ball screw from rotating relative to the movable seat and moving relative to the movable seat along the length direction of the machine platform; The chuck is pivotally connected to the machine platform, and is provided with a plurality of claws for clamping the screw of the ball screw; The servo motor is used to drive the chuck to rotate so that the screw of the ball screw rotates along with the chuck, and a torque speed sensor is connected between the output shaft of the servo motor and the chuck; The hydraulic load is installed on the machine platform, and a tension pressure sensor is arranged between the hydraulic load and the movable seat.

2. The ball screw efficiency detection device according to claim 1, characterized in that: The lower surface of the upper connecting seat is recessed upward to form an upper groove, and the lower surface of the lower connecting seat is recessed downward to form a lower groove, and the upper groove and the lower groove together constitute the accommodating space; the limiting structure includes a protruding rib arranged on the inner wall of the lower groove and / or the inner wall of the upper groove, and a limiting end wall located at both ends of the lower groove and the upper groove, the rib is embedded in the keyway on the nut of the ball screw to prevent the nut of the ball screw from rotating relative to the movable seat, and the two ends of the nut of the ball screw respectively abut against the limiting end walls at both ends of the lower groove and the upper groove to prevent the nut of the ball screw from moving relative to the movable seat along the length direction of the machine.

3. The ball screw efficiency detection device according to claim 1 or 2, characterized in that: A sleeve is fixedly connected to the machine platform, a connecting shaft is inserted into the sleeve and is pivotally connected to the sleeve through a bearing, one end of the connecting shaft is provided with a flange located outside the one end of the sleeve, the other end of the connecting shaft is connected to one end of the torque and speed sensor through a first coupling, the other end of the torque and speed sensor is connected to the output shaft of the servo motor through a second coupling, and the chuck is fixedly connected to the flange.

4. The ball screw efficiency detection device according to claim 3, characterized in that: The bearing includes a first bearing located at one end of the sleeve and a second bearing located at the other end of the sleeve, a sleeve is provided on the connecting shaft and supported between the first bearing inner ring and the second bearing inner ring, the flange is against the outer end of the first bearing inner ring, a locking nut is threaded on the other end of the connecting shaft, a limiting washer is clamped between the locking nut and the outer end of the second bearing inner ring, the limiting washer is provided with a limiting plate located on its inner edge and a locking plate located on its outer edge, a keyway is provided on the connecting shaft for the limiting plate to be embedded, a plurality of slots arranged along its circumference are provided on the locking nut, and the locking plate is embedded in one of the slots to prevent the locking nut from rotating relative to the limiting washer.

5. The ball screw efficiency detection device according to claim 3, characterized in that: A base plate is arranged on the machine platform, and the base plate is fixed on the machine platform in a manner that it can be adjusted along the length direction of the machine platform. A first mounting seat and a second mounting seat staggered along the length direction of the machine platform are fixed on the base plate, the torque speed sensor is mounted on the first mounting seat, the bushing is fixed on the second mounting seat, and the body of the servo motor is fixed on the base plate.

6. The ball screw efficiency detection device according to claim 1, characterized in that: The hydraulic load includes a hydraulic cylinder, an oil pot, and a steel bottle. The hydraulic cylinder includes a cylinder body fixed on the machine platform and a piston installed in the cylinder body. The piston divides the inner cavity of the hydraulic cylinder into a first chamber close to the movable seat and a second chamber away from the movable seat. The tension and pressure sensor is connected between the piston of the hydraulic cylinder and the movable seat. The steel bottle is used to communicate with the second chamber when the movable seat pushes the piston to move, and to communicate with the first chamber when the movable seat pulls the piston to move. The oil pot is used to replenish hydraulic oil into the first chamber when the movable seat pushes the piston to move, and to replenish hydraulic oil into the second chamber when the movable seat pulls the piston to move.

7. The ball screw efficiency detection device according to claim 6, characterized in that: The hydraulic load also includes a first solenoid valve and a second solenoid valve. The first chamber and the oil pot, the first chamber and the steel cylinder, the second chamber and the oil pot, and the second chamber and the steel cylinder are all connected through pipelines. The first solenoid valve is connected to the pipeline between the second chamber and the steel cylinder, and the second solenoid valve is connected to the pipeline between the second chamber and the oil pot.

8. The ball screw efficiency detection device according to claim 6, characterized in that: The piston includes a piston disk located inside the cylinder body and a piston rod extending from the cylinder body, the piston rod divides the inner cavity of the cylinder body into a first chamber and a second chamber, the piston rod is tightly matched with the cylinder body, a connecting cavity is formed between the inner wall of the cylinder body and the outer peripheral surface of the piston rod, a connecting hole is provided on the piston rod, and two openings of the connecting hole formed on the outer peripheral surface of the piston rod are staggered along the axial direction of the piston rod, the two openings of the connecting hole respectively connect the connecting cavity and the first chamber to conduct the connecting cavity and the first chamber, and the pipeline for connecting the first chamber and the oil pot is connected between the connecting cavity and the oil pot.

9. The ball screw efficiency detection device according to claim 6, characterized in that: A mounting plate is fixed to the removable upper shell of the machine platform, and the cylinder body of the hydraulic cylinder is fixed on an adjusting seat located above the mounting plate. A slide groove extending along the length direction of the machine platform is provided on the mounting plate, and a protrusion slidably embedded in the slide groove is provided on the adjusting seat. The adjusting seat and the mounting plate are fastened together by locking bolts.

10. The ball screw efficiency detection device according to any one of claims 6 to 9, characterized in that: A mounting frame is fixed on the machine platform, and the oil pot is fixed on the mounting frame. The height of the oil pot is higher than the height of the hydraulic cylinder so that the hydraulic oil in the oil pot can flow into the first chamber or the second chamber by its own gravity.

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