Dynamic equipment calibration tool

Abstract

The utility model relates to a dynamic equipment calibration tool. The dynamic equipment calibration tool comprises a base, a detection rod and two groups of detection springs, the base is fixed on equipment and is in threaded connection with the detection rod; first and second detection springs sleeve the periphery of the detection rod and respectively abut against the upper and lower ends of the base. The base is composed of an upper cover, a lower cover, a left fan-shaped shell and a right fan-shaped shell. The upper cover is provided with a guide pipe and an internal threaded hole to guide the detection rod to move axially. The upper and lower end faces are provided with limiting grooves to fix the spring. The upper end of the detection rod is provided with a hexagonal connecting seat and an adjustable upper limiting piece, and the lower end is provided with a lower limiting piece. And synchronously acquiring force displacement data based on linear deformation (F = kD) of the spring, comparing preset parameters to verify the precision of the sensor, and adjusting the spring stiffness to realize dynamic calibration.

Description

Technical Field

[0001] This utility model specifically relates to a dynamic equipment calibration fixture. Background Technology

[0002] Currently, in the performance evaluation of dynamically loaded devices such as shock absorbers, dynamic calibration technology heavily relies on precision testing equipment such as vibration tables and high-speed displacement standards. While such equipment can achieve high-precision calibration, it suffers from high costs and complex operation, making it difficult for small and medium-sized shock absorber manufacturers to adopt on a large scale.

[0003] In addition, under dynamic operating conditions, the load sensor of the shock absorber is prone to reference shift due to high-frequency vibration, resulting in distorted calibration results. Traditional calibration methods require repeated disassembly of the sensor for manual calibration, which is inefficient and difficult to guarantee long-term stability. Utility Model Content

[0004] The technical problem this invention aims to solve is to address the shortcomings of the prior art by providing a dynamic equipment calibration fixture with a compact structure that eliminates the need for complex hydraulic or pneumatic systems, thus reducing costs. Furthermore, the reusability of the springs reduces the demand for calibration consumables.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dynamic equipment calibration fixture, characterized in that: it includes a base fixedly installed on the equipment, a detection rod threadedly connected to the base, and two sets of first detection springs and second detection springs arranged sequentially along the axial direction of the detection rod on the outer periphery of the detection rod. One end of the first detection spring is in contact with the base and the other end is in contact with the upper end of the detection rod. One end of the second detection spring is in contact with the base and the other end is in contact with the detection rod.

[0006] Using the above technical solution, the base is fixedly installed on the test bench equipment, and the upper part of the detection rod is linked with the test bench equipment. The test bench equipment drives the detection rod to rotate. Since the detection rod and the base are connected by a thread, the detection rod will also move along its own axis, compressing (or stretching) the first detection spring and stretching (or compressing) the second detection spring, forming a bidirectional dynamic load. Both the first and second detection springs are rigid springs (such as alloy steel springs). Based on the linear relationship of "elastic limit internal force-displacement" (F = kD), multiple sets of data are collected through reciprocating motion. The extension force value of the two springs (load sensor (to be calibrated, installed on the shock absorber test bench equipment) and displacement value (displacement sensor, installed on the shock absorber test bench equipment) are collected simultaneously. The preset linear parameters (k value) of the springs are compared with the output value of the load sensor to verify the accuracy of the equipment. By comparing the data, it is determined whether the load sensor is offset. If it is offset, the external control system automatically corrects the load sensor parameters. In summary, the dynamic equipment calibration fixture provided in this application simulates dynamic loads through spring deformation, eliminating the need for a complex hydraulic system, reducing hardware investment, and allowing personnel to complete calibration simply by collecting linear data. Furthermore, based on the linear characteristics of the spring, the calibration process directly verifies the synchronization between the load sensor and the displacement sensor, reducing offset errors caused by vibration.

[0007] The aforementioned dynamic equipment calibration fixture can be further configured as follows: a first internal threaded hole is provided above the base, an external thread is provided on the outer circumferential surface of the detection rod that is threadedly connected to the first internal threaded hole, and the base is hollow inside and forms a mounting cavity for accommodating the second detection spring.

[0008] Using the above technical solution, when the detection rod rotates, the external thread engages with the first internal thread hole above the base, converting the rotational motion into axial linear movement (i.e., the principle of threaded pair transmission), thereby realizing the lifting and lowering of the detection rod, which in turn compresses (or stretches) the first detection spring and stretches (or compresses) the second detection spring, forming a bidirectional dynamic load.

[0009] The aforementioned dynamic equipment calibration fixture can be further configured as follows: the base includes an upper cover and a lower connecting seat arranged opposite each other, and two sets of left and right symmetrically arranged left and right fan-shaped shells are provided between the upper cover and the lower connecting seat. The upper end of the left fan-shaped shell is fixedly connected to the upper cover and the lower end is fixedly connected to the lower connecting seat. The upper end of the right fan-shaped shell is fixedly connected to the upper cover and the lower end is fixedly connected to the right connecting seat. The receiving cavity is distributed between the left and right fan-shaped shells, and the lower connecting seat has a main mounting hole in the middle.

[0010] The above technical solution utilizes a symmetrical layout of left and right fan-shaped shells, ensuring that stress is evenly distributed across both shells when the base is subjected to dynamic loads (such as torque generated by the rotation of the detection rod or spring compression force), thus preventing deformation or fatigue fracture caused by stress concentration on one side. The base consists of a detachable top cover, a lower connecting seat, and left and right fan-shaped shells, facilitating the installation of the second detection spring. The lower end of the base is fixed to the test bench equipment via the main mounting hole.

[0011] The aforementioned dynamic equipment calibration fixture can be further configured such that: a first guide tube is provided in the middle of the top cover, the two ends of the first guide tube are respectively facing the two sides of the top cover and extending along the axial direction of the detection rod, and the first internal threaded hole is distributed in the first guide tube.

[0012] By adopting the above technical solution, the extension structure of the first guide tube is arranged coaxially with the detection rod to form a rigid guide channel, which improves the axial movement stability of the detection rod and avoids the detection rod from deflecting.

[0013] The aforementioned dynamic equipment calibration fixture can be further configured such that: the upper end face of the top cover is provided with a first limiting groove, the lower end of the first detection spring is inserted into the first limiting groove, the lower end face of the top cover is provided with a second limiting groove, and the upper end of the second detection spring is inserted into the second limiting groove.

[0014] Using the above technical solution, the first limiting groove is used to limit the lower end of the first detection spring, and the second limiting groove is used to limit the upper end of the second detection spring, thereby improving the stability of the extension and retraction movement of the first and second detection springs and preventing skewing.

[0015] The aforementioned dynamic equipment calibration fixture can be further configured such that a viewing window for observing the expansion and contraction of the second detection spring is provided between the side of the left sector-shaped housing and the side of the right sector-shaped housing.

[0016] The above technical solution facilitates the collection of extension and deformation data of the second detection spring.

[0017] The aforementioned dynamic equipment calibration fixture can be further configured as follows: the upper end of the detection rod is provided with an upper connecting seat, the lower end of the upper connecting seat is provided with a connecting hole for connecting to the upper end of the detection rod, the upper end of the upper connecting seat is provided with a stud for linkage with the equipment, and the outer peripheral surface of the upper connecting seat is hexagonal.

[0018] Using the above technical solution, the upper connecting seat is fixedly connected to the detection rod through the lower connecting hole, and is linked with the equipment through a stud. The equipment drives the rotation of the detection rod through the upper connecting seat, and coordinates with the lifting and lowering movement of the detection rod. The hexagonal outer circumference can be matched with standard wrenches or clamps, providing a reliable torque transmission interface during installation or disassembly, avoiding slippage or thread damage.

[0019] The aforementioned dynamic equipment calibration fixture can be further configured such that: the upper end of the detection rod is provided with an upper limit stop, the upper limit stop includes a second guide tube, an upper limit flange ring surrounding the outer periphery of the second guide tube and used to limit the upper end of the first detection spring, the second guide tube is provided with a second internal thread hole that is connected to the external thread of the detection rod, and a first stop nut connected to the detection rod is provided above the upper limit stop.

[0020] Using the above technical solution, the upper limit flange ring limits the upper end of the first detection spring. When the detection rod rises or falls, the compression or tension of the first detection spring is controlled by the upper limit flange ring and the first limiting groove of the top cover. During assembly, since the second guide tube is threadedly connected to the detection rod through the second internal threaded hole, the installation position of the upper limit component can be changed according to the actual situation to adjust the stiffness of the first detection spring. After adjustment, the position of the upper limit component can be fixed by using the first stop nut.

[0021] The aforementioned dynamic equipment calibration fixture can be further configured as follows: the lower end of the detection rod is provided with a lower limiting component, the lower limiting component includes a third guide tube, a lower limiting flange ring surrounding the outer circumference of the third guide tube and used to limit the lower end of the second detection spring, the third guide tube is provided with a third internal thread hole that is externally threaded to the detection rod, and a second stop nut connected to the detection rod is provided above the lower limiting component.

[0022] Using the above technical solution, the lower limit flange ring limits the lower end of the second detection spring. When the detection rod rises or falls, the compression or tension of the second detection spring is controlled by the lower limit flange ring and the second limiting groove of the upper cover. During assembly, since the third guide tube is threadedly connected to the detection rod through the third internal threaded hole, the installation position of the lower limit component can be changed according to the actual situation to adjust the stiffness of the first detection spring. After adjustment, the position of the lower limit component can be fixed by using the second stop nut.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0025] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present utility model;

[0026] Figure 3 This is an exploded view of an embodiment of the present invention;

[0027] Figure 4 This is a data diagram illustrating the application of this utility model embodiment to the testing equipment MTS831.

[0028] Label annotations: Detection rod 1, first detection spring 2, second detection spring 3; top cover 4, first internal threaded hole 4a, first guide tube 4b, first limiting groove 4c; lower connecting seat 5, main mounting hole 5a; left sector housing 6, right sector housing 7, inspection window 8; upper connecting seat 9, connecting hole 9a, stud 9b; upper limit component 10, upper limit flange ring 10a, second guide tube 10b, second internal threaded hole 10c; first stop nut 11; lower limit component 12, third guide tube 12a, lower limit flange ring 12b, third internal threaded hole 12c; second stop nut 13. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] like Figures 1 to 3 The dynamic equipment calibration fixture shown includes a base fixedly installed on the equipment. A detection rod 1 is threadedly connected to the base. Two sets of first detection springs 2 and second detection springs 3 are arranged sequentially along the axial direction of the detection rod 1 on the outer periphery of the detection rod 1. One end of the first detection spring 2 is in contact with the base and the other end is in contact with the upper end of the detection rod 1. One end of the second detection spring 3 is in contact with the base and the other end is in contact with the detection rod 1.

[0031] The base has a first internal threaded hole 4a on its upper part, and the outer circumference of the detection rod 1 has an external thread that is threadedly connected to the first internal threaded hole 4a. The base is hollow and forms a mounting cavity for accommodating the second detection spring 3. When the detection rod 1 rotates, the external thread engages with the first internal threaded hole 4a on the upper part of the base, converting the rotational motion into axial linear movement (i.e., the principle of threaded pair transmission), thereby realizing the lifting and lowering of the detection rod 1, which in turn compresses (or stretches) the first detection spring 2 and stretches (or compresses) the second detection spring 3, forming a bidirectional dynamic load.

[0032] The base includes an upper cover 4 and a lower connecting seat 5 arranged vertically opposite each other. Between the upper cover 4 and the lower connecting seat 5 are two sets of symmetrically arranged left and right sector-shaped shells 6 and 7. The upper end of the left sector-shaped shell 6 is fixedly connected to the upper cover 4, and the lower end is fixedly connected to the lower connecting seat 5. The upper end of the right sector-shaped shell 7 is fixedly connected to the upper cover 4, and the lower end is fixedly connected to the right connecting seat. A receiving cavity is distributed between the left and right sector-shaped shells 6 and 7. A main mounting hole 5a is provided in the middle of the lower connecting seat 5. The symmetrical arrangement of the left and right sector-shaped shells 7 ensures that when the base is subjected to dynamic loads (such as the torque generated by the rotation of the detection rod 1 or the spring compression force), the stress is evenly distributed on both sides of the shells, avoiding deformation or fatigue fracture caused by stress concentration on one side. The base consists of a detachable upper cover 4, a lower connecting seat 5, and left and right sector-shaped shells 7, facilitating the installation of the second detection spring 3. The lower end of the base is fixed to the test bench equipment through the main mounting hole 5a.

[0033] The top cover 4 has a first guide tube 4b in the middle. The two ends of the first guide tube 4b extend towards the two sides of the top cover 4 and along the axial direction of the detection rod 1. The first internal threaded holes 4a are distributed inside the first guide tube 4b. The extension structure of the first guide tube 4b is coaxially arranged with the detection rod 1 to form a rigid guide channel, which improves the axial movement stability of the detection rod 1 and prevents the detection rod 1 from deflecting.

[0034] The upper end face of the top cover 4 is provided with a first limiting groove 4c, and the lower end of the first detection spring 2 is inserted into the first limiting groove 4c. The lower end face of the top cover 4 is provided with a second limiting groove, and the upper end of the second detection spring 3 is inserted into the second limiting groove. The first limiting groove 4c is used to limit the lower end of the first detection spring 2, and the second limiting groove is used to limit the upper end of the second detection spring 3, thereby improving the stability of the extension and retraction movement of the first detection spring 2 and the second detection spring 3 and preventing deflection.

[0035] A viewing window 8 is provided between the side of the left sector-shaped outer shell 6 and the side of the right sector-shaped outer shell 7 for observing the expansion and contraction of the second detection spring 3. This facilitates the collection of expansion and contraction data of the second detection spring 3.

[0036] The upper end of the detection rod 1 is provided with an upper connecting seat 9, and the lower end of the upper connecting seat 9 is provided with a connecting hole 9a for connecting to the upper end of the detection rod 1. The upper end of the upper connecting seat 9 is provided with a stud 9b for linkage with the equipment. The outer peripheral surface of the upper connecting seat 9 is hexagonal. The upper connecting seat 9 is fixedly connected to the detection rod 1 through the lower connecting hole 9a, and is linked with the equipment through the stud 9b. The equipment drives the rotation of the detection rod 1 through the upper connecting seat 9, and moves the detection rod 1 up and down in coordination with the movement of the detection rod 1. The hexagonal outer peripheral surface can be matched with standard wrenches or clamps, providing a reliable torque transmission interface during installation or disassembly, avoiding slippage or thread damage.

[0037] The upper end of the detection rod 1 is also provided with an upper limit stop 10. The upper limit stop 10 includes a second guide tube 10b and an upper limit flange ring 10a surrounding the second guide tube 10b and used to limit the upper end of the first detection spring 2. The second guide tube 10b has a second internal thread hole 10c that is externally threaded to the detection rod 1. The upper limit stop 10 is provided with a first stop nut 11 connected to the detection rod 1. The upper limit flange ring 10a limits the upper end of the first detection spring 2. When the detection rod 1 rises or falls, the compression or tension of the first detection spring 2 is controlled by the upper limit flange ring 10a and the first limiting groove 4c of the top cover 4. During assembly, since the second guide tube 10b is threaded to the detection rod 1 through the second internal thread hole 10c, the installation position of the upper limit stop 10 can be changed according to the actual situation to adjust the stiffness of the first detection spring 2. After adjustment, the position of the upper limit stop 10 can be fixed by the first stop nut 11.

[0038] The lower end of the detection rod 1 is provided with a lower limit component 12, which includes a third guide tube 12a and a lower limit flange ring 12b surrounding the third guide tube 12a and used to limit the lower end of the second detection spring 3. The third guide tube 12a has a third internal thread hole 12c that is externally threaded to the detection rod 1. A second stop nut 13 connected to the detection rod 1 is provided above the lower limit component 12. The lower limit flange ring 12b limits the lower end of the second detection spring 3. When the detection rod 1 rises or falls, the compression or tension of the second detection spring 3 is controlled by the lower limit flange ring 12b and the second limiting groove of the top cover 4. During assembly, since the third guide tube 12a is threaded to the detection rod 1 through the third internal thread hole 12c, the installation position of the lower limit component 12 can be changed according to the actual situation to adjust the stiffness of the first detection spring 2. After adjustment, the position of the lower limit component 12 can be fixed by the second stop nut 13.

[0039] The working principle of this embodiment is as follows:

[0040] During installation, the upper connecting seat 9 is linked with the upper part of the test bench equipment, and the base is fixed to the workbench of the test bench equipment through the main mounting hole 5a of the lower connecting seat 5.

[0041] The test bench equipment drives the detection rod 1 to rotate via the upper connecting seat 9. Since the detection rod 1 is threadedly connected to the upper cover 4 (external thread - first internal thread hole 4a), the detection rod 1 also moves along its own axial direction while rotating. When the detection rod 1 moves upward, the first detection spring 2 gradually stretches and the second detection spring 3 gradually compresses. The load sensor (installed on the test bench equipment) detects the changes in stretching and compression of the first detection spring 2 and the second detection spring 3. Utilizing the rigid spring characteristic that "the force-displacement relationship of the spring conforms to Hooke's Law (F = kD), where F represents the elastic force and D represents the displacement (spring deformation)," and using the static stiffness formula M (K*=∆F / ∆X) to judge its performance, its linear characteristics provide a theoretical basis for calibration.

[0042] Meanwhile, the high-precision pressure sensor and displacement sensor on the test bench simultaneously acquire precise data corresponding to the force value and the displacement of the detection rod 1 (this displacement is the same as the deformation of the first detection spring and the second detection spring), reducing system errors.

[0043] By collecting parameters from the load and displacement sensors of the test bench and comparing them with the inherent characteristics of the rigid spring, it is possible to deduce whether there are any abnormalities in the equipment's accuracy. (Force-displacement curve)

[0044] Specifically, the following is a summary: When the testing device is MTS831, five sets of data are collected as shown in the attached figure. Figure 4 As shown in Figure 1, it is clear that the lines are regular, which indicates that the equipment is of normal accuracy.

[0045] In summary, in this embodiment, the base is fixedly installed on the test bench equipment. The upper part of the detection rod 1 is linked with the test bench equipment. The test bench equipment drives the detection rod 1 to rotate. Since the detection rod 1 and the base are connected by a thread, the detection rod 1 will also move along its own axis, compressing (or stretching) the first detection spring 2 and stretching (or compressing) the second detection spring 3, forming a bidirectional dynamic load. The first detection spring 2 and the second detection spring 3 are both rigid springs (such as alloy steel springs). Based on the linear relationship of "elastic limit internal force-displacement" (F = kD), multiple sets of data are collected through reciprocating motion. The extension force value of the two springs (load sensor (to be calibrated, installed on the shock absorber test bench equipment) and displacement value (displacement sensor, installed on the shock absorber test bench equipment) are collected simultaneously. The preset linear parameters (k value) of the springs are compared with the output value of the load sensor to verify the accuracy of the equipment. By comparing the data, it is determined whether the load sensor is offset. If it is offset, the load sensor parameters are automatically corrected by the external control system. In summary, the dynamic equipment calibration fixture provided in this application simulates dynamic loads through spring deformation, eliminating the need for a complex hydraulic system, reducing hardware investment, and allowing personnel to complete calibration simply by collecting linear data. Furthermore, based on the linear characteristics of the spring, the calibration process directly verifies the synchronization between the load sensor and the displacement sensor, reducing offset errors caused by vibration.

Claims

1. A dynamic equipment calibration fixture, characterized in that: The device includes a base that is fixedly installed on the equipment. The base is threadedly connected to a detection rod. Two sets of first detection springs and second detection springs are sleeved on the outer periphery of the detection rod and arranged sequentially along the axial direction of the detection rod. One end of the first detection spring is in contact with the base and the other end is in contact with the upper end of the detection rod. One end of the second detection spring is in contact with the base and the other end is in contact with the detection rod.

2. The dynamic equipment calibration fixture according to claim 1, characterized in that: The base has a first internal threaded hole on its upper part, and the outer circumferential surface of the detection rod has an external thread that is threaded to the first internal threaded hole. The base is hollow inside and forms a mounting cavity for accommodating the second detection spring.

3. The dynamic equipment calibration fixture according to claim 2, characterized in that: The base includes an upper cover and a lower connecting seat arranged opposite each other. Between the upper cover and the lower connecting seat are two sets of left and right symmetrically arranged left and right fan-shaped shells. The upper end of the left fan-shaped shell is fixedly connected to the upper cover and the lower end is fixedly connected to the lower connecting seat. The upper end of the right fan-shaped shell is fixedly connected to the upper cover and the lower end is fixedly connected to the right connecting seat. The receiving cavity is distributed between the left and right fan-shaped shells. The lower connecting seat has a main mounting hole in the middle.

4. The dynamic equipment calibration fixture according to claim 3, characterized in that: The top cover has a first guide tube in the middle, with both ends of the first guide tube facing the two sides of the top cover and extending along the axial direction of the detection rod. The first internal threaded hole is distributed inside the first guide tube.

5. The dynamic equipment calibration fixture according to claim 4, characterized in that: The upper end face of the top cover is provided with a first limiting groove, and the lower end of the first detection spring is inserted into the first limiting groove. The lower end face of the top cover is provided with a second limiting groove, and the upper end of the second detection spring is inserted into the second limiting groove.

6. The dynamic equipment calibration fixture according to claim 3, characterized in that: A viewing window for observing the expansion and contraction of the second detection spring is provided between the side of the left fan-shaped outer shell and the side of the right fan-shaped outer shell.

7. A dynamic equipment calibration fixture according to any one of claims 1 to 6, characterized in that: The upper end of the detection rod is provided with an upper connecting seat, the lower end of the upper connecting seat is provided with a connecting hole for connecting to the upper end of the detection rod, the upper end of the upper connecting seat is provided with a stud for linkage with the equipment, and the outer peripheral surface of the upper connecting seat is hexagonal.

8. A dynamic equipment calibration fixture according to any one of claims 2 to 6, characterized in that: The upper end of the detection rod is also provided with an upper limit stop, which includes a second guide tube and an upper limit flange ring that surrounds the outer circumference of the second guide tube and is used to limit the upper end of the first detection spring. The second guide tube is provided with a second internal thread hole that is connected to the external thread of the detection rod. A first stop nut that is connected to the detection rod is provided above the upper limit stop.

9. A dynamic equipment calibration fixture according to any one of claims 2 to 6, characterized in that: The lower end of the detection rod is provided with a lower limiting component, which includes a third guide tube and a lower limiting flange ring that surrounds the outer circumference of the third guide tube and is used to limit the lower end of the second detection spring. The third guide tube is provided with a third internal thread hole that is connected to the external thread of the detection rod. A second stop nut that is connected to the detection rod is provided above the lower limiting component.

Images