A non-standard measuring tool for measuring the minimum rotational torque of a ball screw

Abstract

The present invention relates to a non-standard measuring tool for measuring the minimum rotational torque of a ball screw, comprising a base, wherein a front bearing seat, a middle bearing seat, and a rear bearing seat are sequentially arranged at the front, middle, and rear ends of the base; a measuring rod mounting block is provided between the rear bearing seat and the middle bearing seat, a measuring rod movably inserted into the measuring rod mounting block, a rotating shaft inserted into the axial hole of the rear bearing seat is provided on one side of the measuring rod mounting block, and a first coupling is provided on the other side; a stabilizing block is provided between the middle bearing seat and the front bearing seat, a rotating shaft is provided at the rear end of the stabilizing block, which passes through the middle bearing seat and is connected to the first coupling, and a rotating shaft is provided at the front end, which passes through the front bearing seat; a screw input shaft is provided in front of the front bearing seat, and a second coupling is provided at the rear end of the screw input shaft, which is connected to the rotating shaft at the front end of the stabilizing block; the measuring rod mounting block and the stabilizing block are both spaced a certain distance from the top surface of the base. The present invention has a simple structure and can measure torque when the screw is installed.

Description

Technical Field

[0001] The invention belongs to the technical field of torque measurement, and in particular relates to a non-standard measuring tool for measuring the minimum rotational torque of a ball screw in an optical precision machine. Background Art

[0002] In optical precision machinery, ball screws are often used to convert rotary motion into linear motion, or vice versa. These ball screws have the characteristics of high assembly precision requirements and are difficult to disassemble after assembly. In addition, the minimum rotational torque of the ball screw needs to be tested after assembly to verify the accuracy of the ball screw and the assembly process.

[0003] In the prior art, there is no standard detection tool for measuring the minimum rotational torque of a screw, and generally, non-standard measuring tools are designed according to specific application scenarios.

[0004] Patent CN204439258U discloses a torque detection device for a screw, the core technology of which is to measure the screw torque through a motor and a torque sensor.

[0005] Chinese patent application number 201910508162.9 discloses a screw preload force detection device for high-speed ball screw feed testing. The technical core of the device is to limit the preload force to the axial direction of the ball screw by designing an axial force drive retaining device and a side harness guide device, so as to improve the accuracy and stability of the detection data.

[0006] Chinese patent application number 201710446467.2 discloses a ball screw pair torque detector, the core technology of which is also to use a torque sensor for measurement.

[0007] Patent CN212621452U discloses a ball screw torque testing device, the core technology of which is that the screw is driven by a servo motor and the torque of the ball screw is reflected by a pressure sensor.

[0008] A comprehensive analysis of the above screw torque measurement technologies shows that most of them use servo motors and torque sensors to measure torque, and the structure is relatively complex. The torque range they measure is only for the screw itself, and they are all for the case where the ball screw is not assembled, and they cannot accurately measure the torque after the screw is assembled. Summary of the Invention

[0009] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to provide a non-standard measuring tool with a simple structure that can measure the minimum torque of a ball screw after assembly.

[0010] The technical solutions of the present invention are as follows:

[0011] A non-standard measuring tool for measuring the minimum rotational torque of a ball screw, characterized in that: it includes a rectangular base, the front end, middle and rear ends of the base are fixedly provided with a front bearing seat, a middle bearing seat and a rear bearing seat in sequence, the front bearing seat, the middle bearing seat and the rear bearing seat are all provided with an axial hole and the axis of the axial hole is in the same straight line; a measuring rod mounting block is provided between the rear bearing seat and the middle bearing seat, the measuring rod mounting block is provided with a measuring rod jack that passes through both ends of the measuring rod mounting block, a measuring rod is movably inserted in the measuring rod jack, the measuring rod is provided with a scale, and the axis of the measuring rod is aligned with the axis of each bearing seat The axis of the hole is vertical, and a rotating shaft inserted into the shaft hole of the rear bearing seat is provided on one side of the measuring rod mounting block, and a first coupling is provided on the other side; a stabilizing block is provided between the middle bearing seat and the front bearing seat, and rotating shafts are respectively provided at the front and rear ends of the stabilizing block, wherein the rotating shaft at the rear end passes through the shaft hole of the middle bearing seat and is connected to the first coupling, and the rotating shaft at the front end passes through the shaft hole of the front bearing seat; a screw input shaft is provided in front of the front bearing seat, and a second coupling is provided at the rear end of the screw input shaft, and the second coupling is connected to the rotating shaft at the front end of the stabilizing block; the measuring rod mounting block and the stabilizing block are both at a certain distance from the top surface of the base.

[0012] The present invention has the following advantages:

[0013] The present invention realizes the measurement of the minimum torque of the screw through the measuring rod. Compared with similar measuring tools using motors and sensors, the structure is simpler.

[0014] The present invention can realize torque detection after the screw is assembled. Compared with similar measuring tools, its measurement results include the friction resistance formed after the screw is assembled, and the measurement results are closer to the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the component decomposition structure of the present invention;

[0017] Figure 3 It is a schematic diagram of the use state of the present invention. DETAILED DESCRIPTION

[0018] like Figure 1 、 Figure 2As shown, the present invention includes a rectangular base 1, and the front, middle and rear ends of the base are fixedly provided with a front bearing seat 2, a middle bearing seat 3 and a rear bearing seat 4 in sequence. The front, middle and rear ends of the base are all provided with axial holes, and the axes of the axial holes are in the same straight line; a measuring rod mounting block 5 is provided between the rear bearing seat 4 and the middle bearing seat 3, and the measuring rod mounting block 5 is provided with a measuring rod insertion hole 51 passing through both ends of the measuring rod mounting block, and a measuring rod 6 is movably inserted in the measuring rod insertion hole, and a scale is provided on the measuring rod. The axis of the measuring rod is perpendicular to the axis of the axis hole of each bearing seat, and the measuring rod mounting block 5 is provided with a measuring rod. A rotating shaft inserted into the shaft hole of the rear bearing seat is provided on one side, and a first coupling 52 is provided on the other side; a stabilizing block 7 is provided between the middle bearing seat 3 and the front bearing seat 2, and a rotating shaft is provided at the front and rear ends of the stabilizing block respectively, wherein the rotating shaft at the rear end passes through the shaft hole of the middle bearing seat and is connected to the first coupling, and the rotating shaft at the front end passes through the shaft hole of the front bearing seat; a screw input shaft 8 is provided in front of the front bearing seat 2, and a second coupling 81 is provided at the rear end of the screw input shaft 8, and the second coupling 82 is connected to the rotating shaft at the front end of the stabilizing block 7; the measuring rod mounting block 5 and the stabilizing block 7 are both at a certain distance from the top surface of the base 1.

[0019] When the present invention is implemented, a leveling bolt 9 penetrating the base 1 vertically may be provided at each of the four corners of the base 1 to adjust the height of the base and to adjust the base to a horizontal state.

[0020] The stabilizing block mainly acts as a counterweight to balance the forces at the front and rear ends of the base and improve the stability of the device.

[0021] During the specific implementation of the present invention, in order to facilitate the installation and disassembly of individual components, the base can be set as a split assembly structure, including a front mounting plate 11 for fixing the front bearing seat, a rear mounting plate 12 for fixing the rear bearing seat, and an intermediate mounting plate 13 for fixing the middle bearing seat. A slot is respectively provided on the front mounting plate and the rear mounting plate, and the two ends of the intermediate mounting plate 13 are respectively supported in the slots on the front mounting plate 11 and the rear mounting plate 12, and fixed by screws 10; the top surfaces of the front mounting plate, the rear mounting plate and the intermediate mounting plate are flush.

[0022] like Figure 3 As shown, when the present invention is used, the front end of the screw input shaft 8 is connected to the screw 15 installed on the instrument to be measured 14, and one end of the measuring rod 6 is pushed toward the other end, such as from left to right. When the two ends of the measuring rod are unbalanced, a certain torque will be generated. Gradually fine-tune the measuring rod. When the screw overcomes the friction force and just starts to rotate, the measuring rod can be observed to rotate slightly, and the scale on the measuring rod at this time can be read. The scale on the measuring rod can be marked as a length scale or a torque scale. When the scale on the measuring rod is a length scale, the torque T of the screw can be calculated based on the length of the two ends of the measuring rod at this time. The calculation method is as follows:

[0023] Assuming that the density of the measuring rod used is uniform, and the axial circular runout tolerance of the measuring rod meets the measuring tool standard, the error can be ignored, and its radius is r, then:

[0024]

[0025] Where L 左 、L 右 are the lengths of the left and right ends of the measuring rod respectively, and g is the acceleration due to gravity, which is a constant.

[0026] For ease of use, various torque results can also be calculated in advance according to the above formula and marked on the measuring rod as torque scales. When in use, the torque value can be read directly on the measuring rod.

Claims

1. A non-standard measuring tool for measuring the minimum rotational torque of a ball screw, characterized by: The cam is provided with a plurality of camshafts, a plurality of camshafts and a plurality of camshafts, and a plurality of camshafts are provided on the camshaft. The camshafts are provided with a plurality of camshafts and a plurality of camshafts. The camshafts are provided with a plurality of camshafts and a plurality of camshafts. The camshafts are provided with a plurality of camshafts and a plurality of camshafts. The camshafts are provided with a plurality of camshafts and a plurality of camshafts. The camshafts are provided with a plurality of camshafts and a plurality of camshafts. A rotating shaft is provided which is inserted into the shaft hole of the rear bearing seat, and a first coupling is provided on the other side; a stabilizing block is provided between the middle bearing seat and the front bearing seat, and rotating shafts are provided at the front and rear ends of the stabilizing block respectively, wherein the rotating shaft at the rear end passes through the shaft hole of the middle bearing seat and is connected to the first coupling, and the rotating shaft at the front end passes through the shaft hole of the front bearing seat; a screw input shaft is provided in front of the front bearing seat, and a second coupling is provided at the rear end of the screw input shaft, and the second coupling is connected to the rotating shaft at the front end of the stabilizing block; the measuring rod mounting block and the stabilizing block are both spaced a certain distance from the top surface of the base; The four corners of the base are respectively provided with a leveling bolt that passes through the base up and down; the base is a split assembly structure, including a front mounting plate for fixing the front bearing seat, a rear mounting plate for fixing the rear bearing seat, and an intermediate mounting plate for fixing the middle bearing seat. A slot is respectively provided on the front mounting plate and the rear mounting plate, and the two ends of the intermediate mounting plate are respectively supported in the slots on the front mounting plate and the rear mounting plate and fixed by screws; the top surfaces of the front mounting plate, the rear mounting plate and the intermediate mounting plate are flush.

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