Screw rod and nut torsion detection device and method

Abstract

The invention relates to the related technical field of torsion detection, and discloses a screw rod and nut torsion detection device and method.The screw rod and nut torsion detection device comprises a screw rod clamping assembly, a detection driving assembly, a nut connecting assembly and a torsion detector probe, and the screw rod clamping assembly comprises a floating type clamping body and an elastic body; the floating type clamping body is connected with the elastic body and used for clamping the lead screw to be detected in a floating mode, so that pressure borne by the lead screw is reduced, the lead screw is prevented from being clamped, impact jumping and noise are reduced, friction force cannot be increased, and therefore the measuring precision cannot be affected. The detection driving assembly is used for driving a lead screw of a to-be-detected product to rotate, the nut connecting assembly comprises a nut clamping groove, the nut clamping groove is used for containing a nut of the to-be-detected product, the nut can move in the nut clamping groove, and at least the part, making contact with the nut, of the nut connecting assembly is made of a material with the hardness lower than that of the nut. The plastic nut can be effectively prevented from being scratched when the motor moves forwards, backwards, leftwards and rightwards.

Description

Technical Field

[0001] The present invention relates to the technical field related to torque detection, and in particular to a device and method for detecting torque of a screw rod and a nut. Background Art

[0002] In the fields of mechanical engineering, automotive engineering and testing technology, the torque detection of the motor lead screw and nut of the automotive steering column is a crucial link.

[0003] The torque detection of the electric steering column motor screw and nut of the automobile is not only related to the steering performance of the automobile, but also directly affects the safety and comfort of driving. Therefore, the accuracy and reliability of the torque detection equipment and methods of the electric steering column motor screw and nut of the automobile are very high.

[0004] The existing automobile steering column motor lead screw and nut torque detection mainly uses torque testing equipment. This equipment usually consists of a device that can apply torque and a sensor that can measure torque. When working, the lead screw nut assembly to be tested is placed in the fixture of the equipment, and then its torque value is detected by the torque nut. This automobile steering column motor lead screw and nut torque detection technology has some problems and limitations in practical applications.

[0005] First, the existing torque testing equipment often causes certain damage to the screw-nut assembly during the measurement process, which not only affects the measurement accuracy, but also accelerates the wear of the screw-nut assembly; secondly, the existing torque testing equipment is expensive and complex to maintain, which is a considerable burden for some small and medium-sized enterprises and self-employed individuals; thirdly, the existing torque testing equipment can usually only measure torque with a certain fixed accuracy and cannot meet the detection requirements under different accuracies; in response to the above problems, this application is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a screw and nut torque detection device and method, which avoids damage to the screw and nut assembly during the detection process by optimizing the fixture design, and solves the problem that the screw and nut assembly is easily damaged during the detection process of traditional solutions, affecting the accuracy of measurement and accelerating the wear of the screw and nut assembly.

[0007] The present invention is achieved through the following technical solutions.

[0008] The present invention discloses a screw and nut torque detection device and method, comprising a screw positioning assembly, a detection drive assembly, a nut connecting assembly and a torque detector probe, wherein the screw positioning assembly comprises a floating clamping body and an elastic body, wherein the floating clamping body is connected to the elastic body so that the floating clamping body can move within a certain range and is used for floatingly positioning the screw to be detected, which not only reduces the pressure on the screw and avoids the screw from being stuck, but also reduces impact vibration and noise, and does not increase friction, thereby not affecting the measurement accuracy; the detection drive assembly is used to drive the screw of the product to be detected to rotate, and the nut connecting assembly comprises a nut clamping groove, wherein the nut clamping groove is used to accommodate the nut of the product to be detected, and the nut can move in the nut clamping groove, and at least the contact part of the nut connecting assembly with the nut is made of a material with a hardness lower than that of the nut, which can effectively prevent the plastic nut from being scratched when the motor moves forward, backward, left or right, and the nut connecting assembly is connected to the torque detector probe.

[0009] Optionally, the detection drive component adopts a motor or other power mechanism capable of achieving rotational drive.

[0010] Furthermore, the screw rod and nut torque detection device also includes a shell, and the shell is used to support the head of the product to be tested.

[0011] Furthermore, the shell is detachably mounted on the shell fixing body and can be replaced according to the head type of the detected product.

[0012] Furthermore, the screw rod locking assembly also includes a vertical clamp body, the elastic body is a spring, the floating clamp body is plug-in connected to the vertical clamp body, and a spring is arranged between them to achieve a floating effect.

[0013] Furthermore, the contact position between the floating clamping body and the product to be inspected is set as a wedge-shaped structure.

[0014] Furthermore, the screw and nut torque detection device also includes a probe sensor fixing body, and the torque detection instrument probe is detachably connected to the probe sensor fixing body, and the torque detection instrument probe is connected to the torque detection instrument. The torque with different accuracies can be measured by simply replacing the torque detection instrument. Compared with the existing torque testing equipment, it has a wider range of applications and can meet the needs of different users.

[0015] Furthermore, the nut connection assembly is provided with a columnar plug-in body, which should adopt a non-cylindrical structure, such as a polygonal prism, and the torque tester probe is provided with a socket that cooperates with the columnar plug-in body.

[0016] Furthermore, the nut connection assembly is made of plastic.

[0017] Furthermore, the screw and nut torque detection device also includes a screw bracket, which is used to support the screw of the product to be tested.

[0018] A method for detecting the torque of a screw rod and a nut, based on the above-mentioned device for detecting the torque of a screw rod and a nut, comprises the following steps:

[0019] Select the housing: Select the corresponding housing according to the type of screw turbine head to be tested;

[0020] Select a suitable torque tester: Replace the corresponding torque tester according to the requirements of the product to be measured and the measurement accuracy requirements, and connect the torque tester probe to the nut connection assembly;

[0021] Installation of the product to be inspected: Place the screw nut assembly into the housing and the nut slot, then press on the floating clamp to achieve floating clamping of the screw;

[0022] Start testing: Use the detection drive assembly to drive the screw rod, so that the nut slides in the nut slot. The rotational torque is transmitted to the torque tester probe, and the product is judged whether it is qualified based on the measurement data.

[0023] The beneficial effects of the present invention are as follows: by providing a floating clamping body and a plastic nut slot, the screw nut assembly will not be damaged during the detection process, and the nut slot can effectively prevent the plastic nut from being scratched when moving left and right; the floating clamping design adopted will not increase the friction force, thereby not affecting the measurement accuracy, and can also reduce the pressure on the screw, avoid the screw from getting stuck, reduce impact vibration and noise, and improve the accuracy and stability of the measurement.

[0024] Most of the components of this solution are universal standard parts or engineering plastics. Compared with the existing torque test equipment, the cost of the present invention is greatly reduced, the cost is low, and the maintenance is convenient. It is more suitable for small and medium-sized enterprises and self-employed individuals, and it is easy to operate. You only need to put the screw nut assembly to be tested into the housing and nut slot of the device, and then start the forward and reverse adjustable speed switch to complete the torque detection. The whole process does not require manual intervention, which greatly improves work efficiency.

[0025] This design is more universal. You only need to replace the torque tester to measure the torque with different accuracies, and you can adapt to different products by replacing different shells. Compared with existing torque testing equipment, this has a wider range of applications and can meet the needs of different users. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the 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 some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a schematic diagram of the overall structure of the screw rod and nut torque detection device;

[0029] Figure 2 It is a schematic diagram of the exploded structure of the screw rod clamping assembly;

[0030] Figure 3 It is a schematic diagram of the exploded structure of the torque tester probe and the probe sensor fixing body;

[0031] Figure 4 It is the front view of the screw rod and nut torque detection device;

[0032] Figure 5 It is a top view of the screw and nut torque detection device. DETAILED DESCRIPTION

[0033] Combine the following Figure 1-Figure 5 The present invention is described in detail.

[0034] The invention discloses a screw rod and nut torque detection device, which is mainly used for detecting the screw rod and nut of the electric steering column motor of the automobile. Figure 1 , including a base plate 12, a forward and reverse adjustable speed switch 13 arranged on the base plate 12, a screw bracket 6, a screw positioning assembly 2, a detection drive assembly 15, a nut connection assembly 14 and a torque detector probe 4.

[0035] A shell fixing body 9 is arranged on the bottom plate 12, and the shell 1 can be detachably mounted on the shell fixing body 9 and replaced according to the type of screw turbine head of the tested product. The shell is made of aluminum alloy with a thickness of 5 mm.

[0036] The screw rod clamping assembly 2 adopts a vertical clamp, including a vertical clamp body 21, an elastic body 22 and a floating clamp body 23. The vertical clamp body 21 is installed on the quick clamp fixing plate 8. Figure 2The elastic body 22 is a spring. The contact position between the floating clamping body 23 and the product to be inspected is set as a wedge-shaped structure. A plug rod is provided at the connection position between the vertical clamp body 21 and the floating clamping body 23. A plug-in column with a plug hole is provided on the floating clamping body 23. The floating clamping body 23 is plug-in connected to the vertical clamp body 21. A spring is provided between them to achieve a floating effect, so that the floating clamping body 23 can move within a certain range, and is used to float and clamp the screw rod 11 to be inspected. This not only reduces the pressure on the screw rod 11 and avoids the screw rod 11 from getting stuck, but also reduces impact, vibration and noise, and will not increase friction, thereby not affecting the measurement accuracy.

[0037] The detection drive component 15 is used to drive the screw of the product to be inspected to rotate. In this embodiment, the detection drive component 15 uses a motor, which is electrically connected to the forward and reverse adjustable speed switch 13. Corresponding transmission components such as a worm and a screw and worm gear are installed on the motor shaft to realize transmission. A motor bracket 7 is provided on the base plate 12, and the motor is installed on the motor bracket 7.

[0038] The lead screw bracket 6 is installed on the bottom plate 12 and is used to support the lead screw 11 of the product to be inspected. A sleeve is provided on the lead screw 11 at the supporting position, and the lead screw bracket 6 does not directly contact the lead screw 11 .

[0039] like Figure 3 The nut connecting component 14 adopts a circular structure, which has a nut slot 142. The nut slot 142 is used to accommodate the special-shaped nut 10 of the product to be inspected, and the nut 10 can slide left and right in the nut slot 142. The nut connecting component 14 is made of engineering plastic material, which has a lower hardness than the nut 10, and can effectively prevent the plastic nut 10 from being scratched when the motor moves forward, backward, left and right.

[0040] The nut connection assembly 14 is connected to the torque tester probe 4. A columnar plug-in body 141 is provided on the nut connection assembly 14. The columnar plug-in body 141 should adopt a non-cylindrical structure. In this embodiment, a square main body is adopted. The torque tester probe 4 is provided with a socket 41 that cooperates with the columnar plug-in body 141.

[0041] The torque detector probe 4 is connected to the torque detector 3. The torque detector probe 4 is an external torque detector flange probe. A probe sensor fixing body 5 is installed on the base plate 12. The torque detector probe 4 is detachably connected to the probe sensor fixing body 5 through a flange structure and a bolt assembly. The torque detector can be measured at different accuracies by simply replacing the torque detector. Compared with existing torque testing equipment, it has a wider range of applications and can meet the needs of different users.

[0042] Preferably, a waist-shaped hole is provided on the bottom plate 12, and the quick clamp fixing plate 8, the housing fixing body 9 and the probe sensor fixing body 5 are installed at the position of the waist-shaped hole through a bolt assembly, so as to facilitate adjustment of the installation position.

[0043] This solution adopts a low-cost housing 1 and a vertical clamp, and adapts to different types of screw turbine heads by replacing the housing 1, thereby reducing manufacturing costs and simplifying maintenance procedures.

[0044] A replaceable torque tester is used to meet the detection needs under different accuracies. By replacing different torque testers, torque under different accuracies can be measured, which improves the flexibility of measurement.

[0045] Optimize the fixture design and material selection to avoid damage to the screw-nut assembly. The wedge block on the head of the vertical clamp cooperates with the spring to achieve floating positioning of the screw, reducing the pressure and impact on the screw, reducing damage during the measurement process, improving measurement accuracy, and extending the service life of the screw-nut assembly.

[0046] The circular nut slot made of engineering plastics effectively prevents the plastic nut from being scratched when the motor moves forward, backward, left or right, while also avoiding increased friction and affecting measurement accuracy.

[0047] The forward and reverse adjustable speed switch can be used to control the left and right sliding of the nut in the circular slot, thereby achieving accurate measurement of torque.

[0048] Through the above technical means, this technical solution effectively solves the problems of high cost, fixing accuracy, measurement damage, etc. in the prior art, improves the efficiency and accuracy of torque measurement, reduces maintenance costs, and has broad application prospects.

[0049] A method for detecting the torque of a screw rod and a nut, based on the above-mentioned device for detecting the torque of a screw rod and a nut, comprises the following steps:

[0050] Step 1: Select a suitable shell 1, and select the corresponding shell 1 for replacement according to the type of turbine head of the trapezoidal screw 11 to be tested; Select a suitable torque tester: Replace the corresponding torque tester according to the requirements of the product to be measured and the measurement accuracy requirements, and connect the torque tester probe 4 to the nut connection assembly 14.

[0051] Step 2: Adjust the vertical clamp to a suitable height, place the screw rod 11 and the nut 10 into the housing 1 and the nut slot 142, and then press on the floating clamping body 23, which cooperates with the spring to achieve floating clamping of the screw rod 11.

[0052] Step 3: Turn on the torque detector 3 and set the corresponding torque upper limit alarm range. The torque detector used in this embodiment has a measurement range of 0-10Nm and an accuracy of 0.01Nm.

[0053] Step 4: Start the forward and reverse adjustable speed switch 13, and detect that the drive assembly 15, that is, the motor drives the screw 11 to make the nut 10 slide left and right in the nut slot 142. The rotational torque is transmitted to the torque detector probe 4. If it exceeds 0.2NM, an alarm is issued for unqualified products, which are put into the unqualified product box; otherwise, if it is less than 0.2NM, it is a qualified product and is put into the qualified product box.

[0054] Step 5: During the measurement process, the external torque tester probe 4, probe sensor fixture 5, lead screw bracket 6, motor bracket 7 and other components ensure the stability and accuracy of the measurement process.

[0055] Step 6: After the measurement is completed, turn off the forward and reverse adjustable speed switch 13, take out the product, and complete a test.

[0056] Through the above steps, the torque of the motor lead screw and nut of the automobile steering column electric adjustment column can be accurately measured, which improves the measurement efficiency and accuracy and reduces the maintenance cost.

[0057] Furthermore, the torque data can be recorded in real time by setting up a recording module, and the data can be uploaded to a computer in real time, which can facilitate data analysis and quality control for users.

[0058] In general, the automobile steering column electric adjustment motor lead screw and nut torque detection device and method of the present invention have significant advantages in terms of cost, versatility, measurement accuracy, and ease of operation. It is expected to replace existing torque testing equipment and become a new standard for automobile steering column electric adjustment motor lead screw and nut torque detection.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology in this field to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw and nut torque detection device, characterized in that: The invention comprises a screw rod positioning assembly (2), a detection drive assembly (15), a nut connection assembly (14) and a torque detector probe (4); the screw rod positioning assembly (2) comprises a floating clamping body (23) and an elastic body (22); the floating clamping body (23) is connected to the elastic body (22) and is used for floatingly positioning the screw rod to be inspected; the detection drive assembly (15) is used for driving the screw rod of the product to be inspected to rotate; the nut connection assembly (14) comprises a nut clamping groove (142); the nut clamping groove (142) is used for accommodating a nut of the product to be inspected, and the nut can move in the nut clamping groove (142); at least a contact portion of the nut connection assembly (14) with the nut is made of a material having a lower hardness than the nut; and the nut connection assembly (14) is connected to the torque detector probe (4).

2. The screw rod and nut torque detection device according to claim 1, characterized in that: The screw rod and nut torque detection device further comprises a housing (1), wherein the housing (1) is used to support the head of the product to be detected.

3. The screw rod and nut torque detection device according to claim 2, characterized in that: The shell (1) is detachably mounted on the shell fixing body (9) and can be replaced according to the head type of the detected product.

4. The screw rod and nut torque detection device according to claim 3, characterized in that: The screw rod locking assembly (2) further comprises a vertical clamp body (21), the elastic body (22) is a spring, and the floating clamp body (23) is connected to the vertical clamp body (21) and achieves a floating effect through the spring.

5. The screw rod and nut torque detection device according to claim 4, characterized in that: The contact position between the floating clamping body (23) and the product to be inspected is arranged as a wedge-shaped structure.

6. The screw rod and nut torque detection device according to any one of claims 3 to 5, characterized in that: The screw rod and nut torque detection device further comprises a probe sensor fixing body (5), and the torque detection instrument probe (4) and the probe sensor fixing body (5) are detachably connected.

7. The screw rod and nut torque detection device according to claim 6, characterized in that: The nut connection assembly (14) is provided with a non-cylindrical columnar plug-in body (141), and the torque detector probe (4) is provided with a socket (41) that matches the columnar plug-in body (141).

8. The screw rod and nut torque detection device according to any one of claims 3 to 5, characterized in that: The nut connection assembly (14) is made of plastic.

9. The screw rod and nut torque detection device according to any one of claims 3 to 5, characterized in that: The screw and nut torque detection device further comprises a screw bracket (6), wherein the screw bracket (6) is used to support the screw of the product to be detected.

10. A method for detecting torque of a screw rod and a nut, based on the screw rod and a nut torque detection device according to any one of claims 3 to 9, characterized in that: The following steps are involved: Select the housing: Select the corresponding housing (1) according to the type of screw turbine head to be tested; Select a suitable torque tester: according to the requirements of the product to be measured and the measurement accuracy requirements, replace the corresponding torque tester, and connect the torque tester probe (4) to the nut connection assembly (14); Installation of the product to be inspected: Place the screw nut assembly into the housing (1) and the nut clamping groove (142), and then press on the floating clamping body (23) to achieve floating clamping of the screw; Start testing: Use the testing drive assembly (15) to drive the screw rod so that the nut slides in the nut slot (142). The rotational torque received is transmitted to the torque tester probe (4), and the product is judged to be qualified based on the measured data.

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