Torque calibration device

Abstract

The utility model particularly relates to a torque calibration device, which comprises a screw rod piece and a torque calibration device, the rod body is arranged on the seat body; the spring piece is supported by the seat body and is arranged on the rod body in a sleeving manner; the shell is supported by the base and arranged on the spring piece in a sleeving mode. The nut part is movably connected to the rod body in a threaded connection mode; the transmission part is arranged between the spring part and the nut part and sleeves the rod body; the transmission part comprises a pressing disc and a bearing arranged on the pressing disc, and the pressing disc is supported by the spring part so that the bearing can rotate along with the nut part. According to the torque calibration device, the bearing is arranged in the transmission part, so that the rotating friction force of the nut part in the rotating and pressing process is resolved by the bearing, the spring part is only influenced by the pressing force in the rotating and pressing process of the nut part, and the linear precision of the torque calibration device in the torque calibration process is further improved.

Description

Technical Field

[0001] This utility model relates to the field of simulated bolt technology, and more specifically to a torque calibration device. Background Technology

[0002] According to JJF1610-2017 "Calibration Specification for Electric and Pneumatic Torque Wrenches" issued by the metrology and verification department, electric and pneumatic torque wrenches must be equipped with high-torque-rate simulators and low-torque-rate simulators during calibration. The calibration process requires stable simulated bolt connection characteristics and good linearity. In other words, the linearity and stability of the torque are crucial during the calibration of electric and pneumatic torque wrenches.

[0003] Existing technology CN202123381682.X discloses a simulated bolt, which uses a nut to tighten onto a rod to simulate the tightening action of a nut. A clamping block is used; when the nut rotates, it exerts pressure on the clamping block, driving a disc spring to actuate, thus simulating a linear change in the bolt torque. The disc spring deforms when subjected to changing pressure, also simulating changes in bolt torque. However, this process has the following problems: Because the disc nut is fitted onto the rod, it can only be used with either high-torque-rate simulators or low-torque-rate simulators, resulting in poor compatibility. Furthermore, the nut is directly pressed against the clamping block via a washer, and the disc nut is fixed to the clamping block. During rotation, the nut is affected by the washer and the friction between the washer and the clamping block, which impairs the linearity of the measured torque and thus affects calibration accuracy. In addition, the use of a transmission rod and gear to drive the tightening of nuts results in limitations on nut sizes and greater force on the transmission rod, leading to problems such as incompatibility with various wrench sizes and easy damage to the transmission mechanism.

[0004] Existing technology CN107845321A discloses a hydraulic torque connection simulator, which uses hydraulic oil to drive a piston through a channel to simulate torque. It switches between high and low torque rate simulators by controlling the ratio between the pitch of the loading head and the height of the transition frustum. However, this technology suffers from several drawbacks. First, the sealing cost of the hydraulic oil is high, requiring regular maintenance and replacement, thus increasing product cost. Furthermore, the piston's sliding along the inner wall places high demands on the machining precision of the components. Second, hydraulic oil leakage is a significant cause of calibration accuracy failure, and the maintenance and protection costs of the device are also high. Additionally, the high and low torque rate simulators depend on the height of the transition frustum and the pitch of the threaded loader, requiring multiple sets of transition frustums and loaders, resulting in complex configurations. Therefore, the existing technology has high maintenance and component costs.

[0005] Therefore, existing technologies for torque calibration using simulated bolts suffer from technical problems such as incompatibility between high-torque-rate simulators and low-torque-rate simulators, high compatibility costs, and the impact on linear accuracy caused by traditional disc spring contact methods. Furthermore, existing technologies, whether mechanically fixed or hydraulically driven, suffer from drawbacks such as excessive transmission intervals between the nut and spring, and the lack of anti-loosening design for the nut. Utility Model Content

[0006] This invention addresses the technical problems in the prior art, such as the difficulty in compatibility or high cost of compatibility between high torque rate simulators and low torque rate simulators, the impact of traditional disc spring contact methods on linear accuracy, the large transmission interval between the nut and the spring, and the lack of anti-disengagement design for the nut. It provides a torque calibration device that has advantages such as low cost, good compatibility, high linear accuracy, and strong stability.

[0007] This utility model provides a torque calibration device, the torque calibration device comprising:

[0008] A screw assembly, comprising: a base; and a rod body disposed on the base;

[0009] A spring element, which is supported by the seat and sleeved on the rod;

[0010] The housing is supported by the base and sleeved on the spring member;

[0011] A nut component, wherein the nut component is movably connected to the rod body by means of a threaded connection;

[0012] A transmission component, wherein the transmission component is disposed between the spring component and the nut component and is sleeved on the rod body;

[0013] The transmission component includes a pressure plate and a bearing disposed on the pressure plate. The pressure plate is supported by the spring component so that the bearing rotates with the nut component.

[0014] Specifically, the main technical concept of this utility model is to utilize the bearing in the transmission component so that the rotational friction of the nut during the rotation and pressing process is resolved by the bearing, thereby the spring component is only affected by the downward pressure during the rotation and pressing process of the nut, thus improving the linearity of the torque calibration of this utility model and achieving the purpose of improving the calibration accuracy.

[0015] Furthermore, the nut component includes a rotating disk and a rotating body disposed on the rotating disk. The rotating disk is supported by the spring component, a portion of the rotating body extends out of the housing, and the end of the rotating body includes a standard square hole.

[0016] Specifically, another technical concept of this utility model is to design the rotating disk and rotating body as a whole, and to adapt the standard head of electric or pneumatic torque wrench through a standard square hole, so that this utility model can be compatible with all electric or pneumatic torque wrenches with standard heads, thereby improving the applicable scenarios of this utility model.

[0017] Furthermore, the end of the rotating body includes a detachably connected end head, and the standard square hole is provided in the end head;

[0018] The standard square hole includes a 1 / 4 hole, a 3 / 8 hole, or a 1 / 2 hole.

[0019] Specifically, another technical concept of this utility model is that, through the detachable connection of the end, this utility model can be configured with standard square holes of different specifications and models, further expanding the application scenarios of this utility model.

[0020] Optionally, the rotating body and the rotating disk are integrally formed.

[0021] Optionally, the housing includes a limiting member disposed on the housing, the limiting member including a through hole, the through hole being larger than the diameter of the rotating body and smaller than the diameter of the rotating disk.

[0022] Specifically, another technical concept of this utility model is that by using the limiting effect of the limiting member, the rotating disk is confined inside the housing, thereby effectively preventing the nut from coming out of the housing during rotation and ensuring the reliability of the torque calibration device provided by this utility model.

[0023] Furthermore, the limiting member includes an arc-shaped retaining ring, which is accommodated in a groove provided on the inner wall of the end of the housing.

[0024] Optionally, at low torque rates, the spring element may include a disc spring.

[0025] Optionally, at high torque rates, the spring element includes a disc spring and at least two sets of washers disposed between the disc spring and the seat.

[0026] Specifically, another technical concept of this utility model is to use a combination of a gasket and a disc spring to achieve the conversion between low torque rate and high torque rate, and to achieve the switching between the two in a simple and reliable way, thereby improving the compatibility of this utility model.

[0027] Optionally, the base includes a second frustum disposed on the first frustum, the diameter of the second frustum being smaller than that of the first frustum, so that one end of the housing is engaged with the second frustum by a clearance fit.

[0028] Furthermore, the base includes a receiving platform, which is disposed on the other side of the first frustum.

[0029] In summary, this utility model provides a torque calibration device, which has at least the following advantages:

[0030] 1. This utility model utilizes the bearing in the transmission component to resolve the rotational friction of the nut during the rotation and pressing process. This allows the spring to be affected only by the downward pressure during the rotation and pressing process of the nut, thereby improving the linearity of torque calibration and achieving the goal of improving calibration accuracy.

[0031] 2. This utility model features an integrated design for the rotating disc and rotating body, and adapts to the standard heads of electric or pneumatic torque wrenches through a standard square hole, making it compatible with all electric or pneumatic torque wrenches with standard heads and expanding its applicability.

[0032] 3. This utility model utilizes the limiting effect of the limiting component to confine the rotating disk inside the housing, thereby effectively preventing the nut from coming out of the housing during rotation and ensuring the reliability of the torque calibration device provided by this utility model.

[0033] 4. This utility model utilizes a combination of a gasket and a disc spring to achieve the conversion between low torque rate and high torque rate, realizing the switching between the two in a simple and reliable way, improving the compatibility of this utility model and reducing the implementation cost of switching between low torque rate and high torque rate. Attached Figure Description

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0035] Figure 1 A schematic diagram of the structure of a torque calibration device provided in one embodiment of this utility model;

[0036] Figure 2 A disassembly diagram of a torque calibration device provided in one embodiment of this utility model;

[0037] Figure 3 A schematic diagram of the structure of a nut component provided in an embodiment of this utility model;

[0038] Figure 4A schematic diagram of a low torque rate and a high torque rate provided in an embodiment of this utility model;

[0039] 1. Screw; 2. Spring; 3. Housing; 4. Nut; 5. Transmission component; 11. Seat; 12. Rod; 21. Disc spring; 22. Washer; 31. Groove; 32. Limiting component; 41. Rotating disk; 42. Rotating body; 51. Pressure plate; 52. Bearing; 321. Through hole; 322. Snap ring; 421. Standard square hole; 422. End; 423. Assembly thread; 511. Disc; 512. Bearing seat; 521. Ball; 522. Cover plate; 421a. 1 / 2 hole; 421b. 3 / 8 hole; 421c. 1 / 4 hole. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1 to 4 The present invention will be described in detail below.

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0042] This utility model provides a torque calibration device. Through the cooperation of screw component 1, spring component 2, housing 3, nut component 4 and transmission component 5, this utility model has at least the advantages of high calibration linearity accuracy, strong applicability, safety and reliability, wide application scenarios and low cost.

[0043] Example 1

[0044] For details, please see Figure 1 The diagram shows a schematic of a torque calibration device according to an embodiment of the present invention. The torque calibration device includes: a spring 2 sleeved on a rod 12 of a screw 1, and a housing 3 sleeved on the spring 2. The seat 11 of the screw 1 provides mounting support for the spring 2 and the housing 3. A nut 4 is movably connected to the end of the rod 12 via a threaded connection. A transmission component 5 is provided between the nut 4 and the spring 2. The pressure plate 51 of the transmission component 5 presses against the spring 2, and a bearing 52 is provided on the pressure plate 51, causing the bearing 52 to rotate with the nut 4. The working principle of the present invention is that during the rotation of the nut 4, the bearing 52 dissipates the rotational friction of the nut 4, causing it to continuously press down on the spring 2 during rotation, thereby simulating the bolt tightening process, and conversely, simulating the bolt loosening process. The housing 3 and the seat 11 provide structural support for each component. It is worth noting that… Figure 1 A front sectional view of the torque calibration device provided by this utility model.

[0045] Optionally, the base 11 and the rod 12 are integrally formed.

[0046] Optionally, the base 11 is provided with a threaded hole (not shown in the threaded hole diagram), and the rod 12 is screwed onto the base 11 by means of a threaded connection.

[0047] For further explanation of the composition and structure of this utility model, please refer to [link / reference]. Figure 2 The diagram shown is a disassembly schematic of a torque calibration device according to an embodiment of this utility model. Based on Figure 2 As can be seen, in the assembly process of this utility model, the base 11 first provides structural support, then the spring 2 is sleeved on the rod 12, then the rotating part is pressed onto the spring 2 through the threaded connection of the nut 4, and finally the housing 3 sleeves the spring 2, the rotating part and part of the nut 4.

[0048] The base 11 includes a second truncated cone disposed on the first truncated cone. The diameter of the second truncated cone is smaller than that of the first truncated cone, so that one end of the housing 3 is engaged with the outer periphery of the second truncated cone by a clearance fit, thereby allowing the housing 3 to limit the other components inside. The other side of the first truncated cone is provided with a receiving platform, which is used to install on an external workbench to achieve the positioning of the entire torque calibration device.

[0049] Optionally, the transmission component 5 includes a pressure plate 51 and a bearing 52. The pressure plate 51 includes a plate body and a bearing 52 seat disposed on the plate body. The plate body and the bearing 52 seat are integrally formed and have a hollow structure for fitting onto the rod body 12. At the same time, the plate body and the housing 3 are clearance-fitted. The bearing 52 seat is used to install balls, and the cover plate is used to encapsulate the balls, so that the nut 4 contacts the cover plate.

[0050] Optionally, the nut component 4 includes a rotating disk 41 and a rotating body 42. The rotating disk 41 abuts against the cover plate and is integrally formed with the rotating body 42. It is provided with a hollow threaded hole to fit the external thread of the rod body 12, so that the nut component 4 can rotate around the rod body 12 to simulate the bolt tightening process. The end of the rotating body 42 is provided with a standard square hole 421 for connecting to an electric or pneumatic wrench.

[0051] Optionally, the housing 3 includes a limiting member 32, which includes an arc-shaped retaining ring 322. The retaining ring 322 is accommodated in a groove 31 provided inside the end of the housing 3. The through hole 321 of the retaining ring 322 is larger than the diameter of the rotating body 42 and smaller than the diameter of the rotating disk 41, so that the retaining ring 322 can limit the rotating disk 41 and prevent the nut from flying off during the loosening process.

[0052] Example 2

[0053] Based on Example 1, please refer to Figure 3 The diagram shows a structural schematic of a nut component 4 provided in an embodiment of this utility model. A standard square hole 421 is provided on an independent end 422, which is fixed to the end of the rotating body 42 by a mounting thread 423. The standard square hole 421 includes 1 / 2 hole 421a, 3 / 8 hole 421b, 1 / 4 hole 421c, or other specifications of torque wrench holes, thereby enabling adaptation to different specifications of wrenches simply by changing the end 422 of the different standard square hole 421.

[0054] Example 3

[0055] Based on Example 1, please refer to Figure 4 The diagram shown is a structural schematic of a low torque rate and a high torque rate according to an embodiment of this utility model. Figure 4 In (A), the spring element 2 is composed of two stacked disc springs 21, or it can be composed of a single disc spring 21, thus enabling its use in low torque rate applications. Figure 4 In (B), the spring component 2 comprises a disc spring 21 and multiple sets of washers 22 disposed under the disc spring 21, thereby enabling it to be used in high torque rate applications. Furthermore, the number and thickness of the washers 22 are adjustable, thereby allowing adjustment for the torque rate.

[0056] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the present invention and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A torque calibration device, characterized in that, The torque calibration device includes: The screw component (1) includes: a base (11); and a rod (12) disposed on the base (11); Spring (2), which is supported by the seat (11) and sleeved on the rod (12); The housing (3) is supported by the seat (11) and sleeved on the spring member (2); Nut (4), which is movably connected to the rod (12) by means of threaded connection; Transmission component (5), wherein the transmission component (5) is disposed between the spring component (2) and the nut component (4) and sleeved on the rod body (12); The transmission component (5) includes a pressure plate (51) and a bearing (52) disposed on the pressure plate (51). The pressure plate (51) is supported by the spring component (2) so that the bearing (52) rotates with the nut component (4).

2. The torque calibration device as described in claim 1, characterized in that, The nut component (4) includes a rotating disk (41) and a rotating body (42) disposed on the rotating disk (41). The rotating disk (41) is supported by the spring component (2). A portion of the rotating body (42) extends out of the housing (3), and the end of the rotating body (42) includes a standard square hole (421).

3. The torque calibration device as described in claim 2, characterized in that, The end of the rotating body (42) includes a detachably connected end head (422), and the standard square hole (421) is provided on the end head (422); The standard square hole (421) includes a 1 / 4 hole (421c), a 3 / 8 hole (421b), or a 1 / 2 hole (421a).

4. The torque calibration device as described in claim 2, characterized in that, The rotating body (42) and the rotating disk (41) are integrally formed.

5. The torque calibration device as described in claim 2, characterized in that, The housing (3) includes a limiting member (32), which is disposed on the housing (3). The limiting member (32) includes a through hole (321), which is larger than the diameter of the rotating body (42) and smaller than the diameter of the rotating disk (41).

6. The torque calibration device as described in claim 5, characterized in that, The limiting member (32) includes an arc-shaped retaining ring (322), which is accommodated in a groove (31) provided on the inner wall of the end of the housing (3).

7. The torque calibration device as described in claim 1, characterized in that, At low torque rates, the spring element (2) includes a disc spring (21).

8. The torque calibration device as described in claim 1, characterized in that, At high torque rates, the spring (2) includes a disc spring (21) and at least two sets of washers (22) disposed between the disc spring (21) and the seat (11).

9. A torque calibration device as described in claim 1, characterized in that, The base (11) includes a second truncated cone disposed on the first truncated cone. The diameter of the second truncated cone is smaller than that of the first truncated cone, so that one end of the housing (3) is engaged with the second truncated cone by a clearance fit.

10. A torque calibration device as described in claim 9, characterized in that, The base (11) includes a receiving platform, which is disposed on the other side of the first frustum.

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