A vertical torque sensor calibration tool

Abstract

The invention discloses an upright torque sensor calibration tool, comprising: a support assembly, a loading plate, an air bearing assembly, a hanging wire and a weight; abandoning the existing horizontal calibration tool, adopting a vertical hanging wire weight assembly in conjunction with an air bearing assembly to maximize the elimination of mechanical friction generated during the torque loading process, so that the entire device can provide high-precision standard torque; in addition, the clamping position of the hanging wire and the support shaft can be adjusted according to experimental requirements to achieve clockwise torque loading or counterclockwise torque loading, and has good application prospects and scope of application.

Description

Technical Field

[0001] The invention relates to the technical field of micro torque measurement, and more particularly to a vertical torque sensor calibration tool. Background Art

[0002] Torque measurement is an important part of every aspect of mechanical product production. Torque is also a key parameter for evaluating the quality of mechanical products such as bearings and reducers. There are three main ways to measure torque: energy method, balance method, and transfer method. The transfer method is also called the torsion shaft method. It is a method of measuring torque based on the changes in physical parameters generated by the elastic shaft when transmitting torque. These physical parameters can be deformation, strain, and stress of the elastic shaft. In order to achieve accurate measurement of torque, torque sensors designed based on the transfer method are currently used in experiments. Torque sensors need to be calibrated before use to obtain linearity, sensitivity, hysteresis, repeatability and other characteristic indicators. The existing torque sensor calibration tooling is mostly horizontal. Due to the effect of gravity, a large radial load will be generated on the torque input and output shaft of the torque sensor being measured, resulting in large mechanical friction. Therefore, it is impossible to provide accurate standard torque and it is difficult to meet actual engineering needs.

[0003] Therefore, designing a torque sensor calibration tool that can provide sufficiently accurate standard torque is of great engineering significance. Summary of the invention

[0004] The present invention aims to solve one of the above-mentioned technical problems in the prior art at least to a certain extent.

[0005] To this end, an object of the present invention is to provide an upright torque sensor calibration tool, comprising:

[0006] A support assembly, wherein the lower part of the support assembly is connected to the torque sensor, and the torque input shaft of the torque sensor passes through the support assembly and extends to the upper part of the support assembly;

[0007] A loading disk, the loading disk is circular, and has a mounting seat in the middle, the torque input shaft is connected to the mounting seat; the circumference of the loading disk is inwardly recessed to form a first annular groove;

[0008] An air-floating bearing assembly, the air-floating bearing assembly comprises a bearing seat, an air-floating bearing, a support shaft and an air guide tube, the bearing seats have two, which are symmetrically arranged on both sides of the support assembly and fixedly connected to the support assembly; the air-floating bearing is installed in the bearing seat, the support shaft is installed in the air-floating bearing and both ends of the support shaft extend beyond the bearing seat; one end of the air guide tube passes through the bearing seat and is arranged corresponding to the air-floating bearing, and the other end is connected to an external high-pressure air source; a second annular groove is provided on the outer surface of the support shaft;

[0009] A hanging wire, one end of which is fixedly connected to the loading disk, and the other end of which is sequentially inserted into the first annular groove and the second annular groove and then extends downward, and the other end of the hanging wire is connected to one or more weights.

[0010] In the above technical solution, the outer surface of the support shaft is provided with a second annular groove, which should be understood as the second annular grooves are provided at both end ends extending outside the bearing seat.

[0011] The beneficial effects of the present invention are:

[0012] Abandoning the existing horizontal calibration tooling, a vertical hanging wire weight assembly is used in conjunction with an air bearing assembly to maximize the elimination of mechanical friction generated during torque loading, so that the entire device can provide high-precision standard torque; in addition, the card-in position of the hanging wire and the support shaft can be adjusted according to experimental requirements to achieve clockwise or counterclockwise torque loading, which has good application prospects and scope of application.

[0013] Furthermore, the loading plate includes a circular ring and a connecting rod, the circumference of the circular ring is inwardly recessed to form a first annular groove, one end of the connecting rod is fixedly connected to the circular ring, and the other end is fixedly connected to the mounting seat.

[0014] In the above technical solution, the structure of the ring is roughly similar to the metal inner wheel of a bicycle wheel. After one end of the hanging wire is fixedly connected to a point outside the ring, it can be wound along the first annular groove and then inserted into the second annular groove.

[0015] Furthermore, it also includes a quick-connect joint, wherein a screw hole is provided at the upper end of the bearing seat, and the lower end of the screw hole extends into the bearing seat and corresponds to the position of the air bearing, one end of the quick-connect joint is threadedly connected to the screw hole, and the other end is connected to the air guide tube, and the quick-connect joint is hollow inside.

[0016] In the above technical solution, the quick-connect connector can, on the one hand, quickly dismantle the airway tube and other equipment after the experiment, and on the other hand, can also fix the airway tube during the experiment to avoid instability of the airway tube under high air pressure.

[0017] Furthermore, it also includes a first locking screw. The support assembly includes a support base and a support frame. The support base is arranged above the support frame. The support frame defines a accommodating cavity for accommodating a torque sensor. The torque sensor is installed in the accommodating cavity. The first locking screw is threadedly connected to the outer edge of the torque sensor and the support base in sequence.

[0018] Furthermore, it also includes limit blocks, at least two of which are fixedly arranged on the upper surface of the support seat, and multiple limit blocks are located on the same side of the support seat, and the limit blocks are bent to form a horizontally arranged limit plate, and the outer edge of the loading disk protrudes upward to form a limit part, the height of the limit part is higher than the limit plate and the limit part is located between two adjacent limit plates.

[0019] The beneficial effects of adopting the above technical solution are:

[0020] A mechanical limiting structure is formed by the limiting block and the limiting part to prevent the torque sensor from being damaged by accidental excessive loading torque.

[0021] Furthermore, it also includes a second locking screw, which is threadedly connected to the limit block and the support seat in sequence.

[0022] Furthermore, it also includes a third locking screw, which is threadedly connected to the bearing seat and the support seat in sequence.

[0023] Furthermore, it also includes a spring retaining ring, which is sleeved outside the support shaft and fixedly connected to the support shaft.

[0024] The function of the spring retaining ring is to limit the support shaft to prevent the support shaft from separating from the air bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram;

[0027] Figure 2 It is a schematic diagram of the limit block structure;

[0028] Figure 3 for Figure 1 Top view;

[0029] Figure 4 for Figure 3 Schematic diagram of the cross section in AA direction;

[0030] Figure 5 for Figure 3 Schematic diagram of the cross section in the BB direction;

[0031] Figure 6 Schematic diagram of the spring retaining ring structure.

[0032] Among them, 1-support assembly, 101-support seat, 102-support frame, 2-torque sensor, 201-torque input shaft, 3-loading plate, 301-ring, 302-connecting rod, 303-limiting part, 304-mounting seat, 4-air bearing assembly, 401-bearing seat, 402-air bearing, 403-support shaft, 404-air guide tube, 5-hanging line, 6-weight, 7-quick connect connector, 8-first locking screw, 9-limiting block, 901-limiting plate, 10-second locking screw, 11-third locking screw, 12-spring retaining ring. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, 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 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 the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] like Figure 1-6 As shown, the embodiment of the present invention discloses an upright torque sensor calibration tool, including: a support assembly 1, the lower part of the support assembly 1 is connected to the torque sensor 2, the torque input shaft 201 of the torque sensor 2 passes through the support assembly 1 and extends to the upper part of the support assembly 1; a loading disk 3, the loading disk 3 is circular, and the middle part has a mounting seat 304, the torque input shaft 201 is connected to the mounting seat 304; the circumferential direction of the loading disk 3 is inwardly recessed to form a first annular groove; an air bearing assembly 4, the air bearing assembly 4 includes a bearing seat 401, an air bearing 402, a support shaft 403 and an air guide tube 404, the bearing seat 401 has two , symmetrically arranged on both sides of the support component 1 and fixedly connected to the support component 1; the air bearing 402 is installed in the bearing seat 401, the support shaft 403 is installed in the air bearing 402 and both ends of the support shaft 403 extend beyond the bearing seat 401; one end of the air guide tube 404 passes through the bearing seat 401 and is arranged corresponding to the air bearing 402, and the other end is connected to the external high-pressure air source; the outer surface of the support shaft 403 is provided with a second annular groove; the hanging wire 5, one end of the hanging wire 5 is fixedly connected to the loading disk 3, and the other end is successively inserted into the first annular groove and the second annular groove and then extends downward, and the other end of the hanging wire 5 is connected to one or more weights 6.

[0039] like Figure 1 As shown, in this embodiment, the loading disk 3 includes a ring 301 and a connecting rod 302 . The circumference of the ring 301 is inwardly recessed to form a first annular groove. One end of the connecting rod 302 is fixedly connected to the ring 301 , and the other end is fixedly connected to the mounting seat 304 .

[0040] like Figure 1 As shown, in this embodiment, a quick connector 7 is also included. A screw hole is opened at the upper end of the bearing seat 401, and the lower end of the screw hole extends into the bearing seat 401 and corresponds to the position of the air bearing 402. One end of the quick connector 7 is threadedly connected to the screw hole, and the other end is connected to the air guide tube 404. The quick connector 7 is hollow inside.

[0041] like Figure 1As shown, in this embodiment, four process holes with larger cross-sections are opened through the front and back sides of the support base 101 to facilitate the removal and installation of the torque sensor 2, while also leaving wiring space for the torque sensor 2.

[0042] like Figure 5 As shown, in this embodiment, it also includes a first locking screw 8, the support assembly 1 includes a support base 101 and a support frame 102, the support base 101 is arranged above the support frame 102, the support frame 102 defines a receiving cavity for accommodating the torque sensor 2, the torque sensor 2 is installed in the receiving cavity, and the first locking screw 8 is threadedly connected to the outer edge of the torque sensor 2 and the support base 101 in sequence.

[0043] like Figure 1-2 As shown, in this embodiment, it also includes a limit block 9, at least two limit blocks 9 are fixedly arranged on the upper surface of the support seat 101, and multiple limit blocks 9 are located on the same side of the support seat 101. The limit block 9 is bent to form a horizontally arranged limit plate 901, and the outer edge of the loading plate 3 protrudes upward to form a limit portion 303. The height of the limit portion 303 is higher than the limit plate 901 and the limit portion 303 is located between two adjacent limit plates 901. It also includes a second locking screw 10, which is threadedly connected to the limit block 9 and the support seat 101 in turn. Figure 2 As shown, in this embodiment, a long hole is opened on the limit block 9 for the second locking screw 10 to pass through (at this time, the second locking screw 10 is not threadedly connected to the above-mentioned long hole, but maintains a threaded connection with the support seat 101). After the second locking screw 10 is inserted into the long hole, it is threadedly connected to the support seat 101. The limit block 9 can adjust its position slightly along the length direction of the long hole. The specific adjustment distance can be determined according to the limit torque that the torque sensor 2 can withstand.

[0044] like Figure 4 As shown, in this embodiment, a third locking screw 11 is further included, and the third locking screw 11 is threadedly connected to the bearing seat 401 and the support seat 101 in sequence. When each locking screw is locked, an elastic washer can be inserted to prevent loosening.

[0045] like Figure 1 and Figure 6 As shown, in this embodiment, a spring retaining ring 12 is further included. The spring retaining ring 12 is sleeved outside the support shaft 403 and fixedly connected to the support shaft 403.

[0046] The specific working process is as follows:

[0047] The vertical torque sensor 2 calibration tool disclosed in the present application is applied to the occasion of static calibration of the torque sensor 2. Specifically, before the calibration operation, the torque sensor 2 to be measured needs to be installed on the support seat 101, and the loading plate 3 needs to be installed on the torque input shaft 201 of the torque sensor 2; two limit blocks 9 need to be installed on the same side of the support seat 101, and the limit portion 303 on the loading plate 3 needs to be located between the two limit blocks 9; finally, the hanging wire 5 is placed in the first annular groove and the second annular groove, one end of the hanging wire 5 is connected to the circular ring 301, and the other end of the hanging wire 5 extends vertically downward to be connected to the weight 6.

[0048] 0.5MPa high pressure gas is passed through the air pipe 404, so that an air film is generated between the support shaft 403 and the air bearing 402, thereby the support shaft 403 can achieve frictionless axial and rotational motion in the air bearing 402, effectively eliminating mechanical friction, so that the whole device can provide high-precision standard torque. The diameter of the ring 301 of the loading plate 3 is D, and the mass of the weights 6 hung on both sides is M, then the standard torque provided by the whole device is T=MgD.

[0049] The present invention provides an upright torque sensor calibration tooling, which abandons the existing horizontal calibration tooling and adopts a vertical hanging wire weight assembly in conjunction with an air bearing assembly to maximize the elimination of mechanical friction generated during the torque loading process, so that the entire device can provide high-precision standard torque; in addition, the card-in position of the hanging wire and the support shaft can be adjusted according to experimental requirements to achieve clockwise torque loading or counterclockwise torque loading, which has good application prospects and scope of application.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A vertical torque sensor calibration tool, characterized in that: include: A support assembly (1), wherein the lower portion of the support assembly (1) is connected to a torque sensor (2), and a torque input shaft (201) of the torque sensor passes through the support assembly (1) and extends to the upper portion of the support assembly (1); A loading disc (3), the loading disc (3) is circular, with a mounting seat (304) in the middle, the torque input shaft (201) being connected to the mounting seat (304); the circumference of the loading disc (3) is inwardly recessed to form a first annular groove; An air-floating bearing assembly (4), the air-floating bearing assembly (4) comprising a bearing seat (401), an air-floating bearing (402), a support shaft (403) and an air guide tube (404), the bearing seats (401) having two portions, symmetrically arranged on both sides of the support assembly (1) and fixedly connected to the support assembly (1); the air-floating bearing (402) being installed in the bearing seat (401), the support shaft (403) being installed in the air-floating bearing (402) and both ends of the support shaft (403) extending beyond the bearing seat (401); one end of the air guide tube (404) passing through the bearing seat (401) and being arranged corresponding to the air-floating bearing (402), and the other end being connected to an external high-pressure air source; a second annular groove is provided on the outer surface of the support shaft (403); A hanging wire (5), one end of which is fixedly connected to the loading plate (3), and the other end of which is inserted into the first annular groove and the second annular groove in sequence and then extends downward, and the other end of the hanging wire (5) is connected to one or more weights (6); a first locking screw (8), the support assembly (1) comprising a support seat (101) and a support frame (102), the support seat (101) being arranged above the support frame (102), the support frame (102) defining a receiving cavity for receiving the torque sensor (2), the torque sensor (2) being installed in the receiving cavity, the first locking screw (8) being threadedly connected to the outer edge of the torque sensor (2) and the support seat (101) in sequence; a limit block (9), wherein at least two limit blocks (9) are fixedly arranged on the upper surface of the support seat (101), and the plurality of limit blocks (9) are located on the same side of the support seat (101); the limit blocks (9) are bent to form a horizontally arranged limit plate (901); the outer edge of the loading plate (3) protrudes upward to form a limit portion (303); the limit portion (303) is higher than the limit plate (901) and is located between two adjacent limit plates (901); The second locking screw (10) is provided on the limiting block (9) with a long hole for the second locking screw (10) to pass through. After the second locking screw (10) is inserted into the long hole, it is threadedly connected to the support seat (101).

2. The upright torque sensor calibration tool according to claim 1, characterized in that: The loading plate (3) comprises a circular ring (301) and a connecting rod (302); the circumference of the circular ring (301) is inwardly recessed to form a first annular groove; one end of the connecting rod (302) is fixedly connected to the circular ring (301), and the other end is fixedly connected to the mounting seat (304).

3. The upright torque sensor calibration tool according to claim 1, characterized in that: It also includes a quick-connect connector (7), wherein a screw hole is provided at the upper end of the bearing seat (401), and the lower end of the screw hole extends into the bearing seat (401) and corresponds to the position of the air bearing (402), one end of the quick-connect connector (7) is threadedly connected to the screw hole, and the other end is connected to the air guide tube (404), and the interior of the quick-connect connector (7) is hollow.

4. The upright torque sensor calibration tool according to claim 1, characterized in that: It also includes a third locking screw (11), and the third locking screw (11) is threadedly connected to the bearing seat (401) and the support seat (101) in sequence.

5. The upright torque sensor calibration tool according to claim 1, characterized in that: It also includes a spring retaining ring (12), wherein the spring retaining ring (12) is sleeved outside the support shaft (403) and is fixedly connected to the support shaft (403).

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