Oil cylinder displacement sensor precision detection device

Abstract

The utility model belongs to the technical field of magnetostriction displacement sensor precision testing, and particularly relates to an oil cylinder displacement sensor precision detection device which comprises a detection table, a magnetostriction displacement sensor assembly to be detected, a grating ruler displacement sensor assembly and a displacement linear driving assembly. The magnetostrictive displacement sensor assembly to be measured comprises a magnetostrictive displacement sensor, a displacement sensor guide rod and a magnetic ring, the magnetic ring reciprocates along the displacement sensor guide rod, and the grating ruler displacement sensor assembly comprises a grating ruler and a grating ruler displacement sensor arranged corresponding to the grating ruler. The displacement linear driving assembly comprises a displacement driving element and a displacement reciprocating sliding part, the displacement reciprocating sliding part is respectively connected with the grating ruler displacement sensor and the magnetic ring, and the displacement driving element drives the displacement reciprocating sliding part to drive the grating ruler displacement sensor and the magnetic ring to reciprocate. The automation degree is high, and the detection is accurate.

Description

Technical Field

[0001] This utility model belongs to the field of precision testing technology for magnetostrictive displacement sensors, and specifically relates to a precision testing device for hydraulic cylinder displacement sensors. Background Technology

[0002] Magnetostrictive displacement sensors use internal non-contact measurement and control technology to accurately detect the absolute position of a moving magnetic ring to measure the actual displacement value of the product being tested; the high precision and high reliability of this sensor have led to its widespread application in thousands of real-world cases.

[0003] Magnetostrictive displacement sensors are widely used in hydraulic cylinders as actuators to achieve linear reciprocating motion, and are widely used in functions such as steering, lifting, and tipping in engineering machinery. The main components include the cylinder head, cylinder bottom, piston rod, piston, cylinder barrel, sealing guides, and the built-in magnetostrictive displacement sensor. The built-in magnetostrictive displacement sensor is the measuring element for detecting the piston's position accuracy; the accuracy of the sensor itself determines the positioning and measurement accuracy of the piston position.

[0004] The current accuracy detection status of magnetostrictive displacement sensors is as follows:

[0005] Manufacturers typically use laser rangefinders for travel detection, but the equipment is expensive, and users generally do not inspect it upon arrival at the factory, which poses a potential quality risk.

[0006] For incoming inspections by user units, most employ self-made positioning fixtures, mounted on coordinate measuring machines (CMMs), with the measurement process performed manually. This approach has the following drawbacks:

[0007] 1. Self-made measuring fixtures result in a lengthy alignment process and low positioning accuracy;

[0008] 2. The measurement involves manual intervention, and the accuracy is greatly affected by human factors;

[0009] 3. Due to the high cost of coordinate measuring machines (CMMs), measurement costs are also high.

[0010] 4. The measurement efficiency is low, and it requires high measurement skills from the operators, resulting in a long measurement cycle. Utility Model Content

[0011] This invention provides a device for detecting the accuracy of a hydraulic cylinder displacement sensor, which can solve the problems pointed out in the background art.

[0012] A hydraulic cylinder displacement sensor accuracy testing device includes a testing platform, a magnetostrictive displacement sensor assembly to be tested, a grating ruler displacement sensor assembly, and a linear displacement drive assembly. The magnetostrictive displacement sensor assembly to be tested includes a magnetostrictive displacement sensor, a displacement sensor guide rod, and a magnetic ring. The magnetic ring reciprocates along the displacement sensor guide rod. The grating ruler displacement sensor assembly includes a grating ruler and a grating ruler displacement sensor corresponding to the grating ruler. The linear displacement drive assembly includes a displacement drive element and a reciprocating slider. The reciprocating slider is connected to the grating ruler displacement sensor and the magnetic ring, respectively, and is driven by the displacement drive element to drive the reciprocating slider to move the grating ruler displacement sensor and the magnetic ring reciprocally.

[0013] Preferably, the magnetostrictive displacement sensor assembly to be tested is fixed on the testing stage by a sensor mounting bracket assembly.

[0014] Preferably, the sensor mounting assembly includes a perforated mounting base and a perforated mounting rail disposed on the top surface of the perforated mounting base.

[0015] Preferably, the linear displacement drive assembly is an electric linear screw module, the reciprocating displacement slider is connected to the linear slide rail by a sliding hook, and the reciprocating displacement slider is connected to the screw sleeve of the electric linear screw module.

[0016] Preferably, both the grating ruler displacement sensor and the magnetic ring are connected to the displacement reciprocating sliding member by bolts.

[0017] Beneficial effects: This utility model provides a hydraulic cylinder displacement sensor accuracy detection device, which can simulate the usage process of a magnetostrictive displacement sensor assembly, quickly realize its accuracy detection, and intuitively determine whether the tested part is qualified or not, reducing the influence of human factors on the detection process. This utility model has the advantages of simple operation, high degree of automation, and accurate detection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a top view of the present invention;

[0020] Explanation of reference numerals in the attached figures:

[0021] The following are labeled in the diagram: Detection table 1; Magnetostrictive displacement sensor 21; Displacement sensor guide rod 22; Magnetic ring 23; Grating ruler 31; Grating ruler displacement sensor 32; Displacement drive element 41; Displacement reciprocating slider 42; Linear slide rail 43; Perforated mounting base 51; Perforated mounting rail 52. Detailed Implementation

[0022] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0023] Example 1:

[0024] like Figure 1-2 As shown in the figure, an embodiment of the present invention provides a hydraulic cylinder displacement sensor accuracy detection device, including a detection platform 1, a magnetostrictive displacement sensor assembly to be tested, a grating ruler displacement sensor assembly, and a linear displacement drive assembly. The magnetostrictive displacement sensor assembly to be tested includes a magnetostrictive displacement sensor 21, a displacement sensor guide rod 22, and a magnetic ring 23. The magnetic ring 23 reciprocates along the displacement sensor guide rod 22. The grating ruler displacement sensor assembly includes a grating ruler 31 and a grating ruler displacement sensor 32 corresponding to the grating ruler 31. The linear displacement drive assembly includes a displacement drive element 41 and a displacement reciprocating slider 42. The displacement reciprocating slider 42 is connected to the grating ruler displacement sensor 32 and the magnetic ring 23 respectively, and the displacement drive element 41 drives the displacement reciprocating slider 42 to drive the grating ruler displacement sensor 32 and the magnetic ring 23 to reciprocate.

[0025] Specifically, the magnetostrictive displacement sensor assembly to be tested is fixed on the testing stage 1 by a sensor mounting bracket assembly. The sensor mounting bracket assembly includes a perforated mounting base 51 and a perforated mounting rail 52 disposed on the top surface of the perforated mounting base 51.

[0026] Specifically, the linear displacement drive assembly is an electric linear lead screw module, the reciprocating displacement slider 42 is connected to the linear slide rail 43 by a sliding hook, the reciprocating displacement slider 42 is connected to the lead screw sleeve of the electric linear lead screw module, the grating ruler displacement sensor 32 and the magnetic ring 23 are both connected to the reciprocating displacement slider 42 by bolts, the grating ruler 31 is located between the linear displacement drive assembly and the magnetostrictive displacement sensor assembly to be measured, and the grating ruler 31 is arranged parallel to the displacement sensor guide rod 22 and the linear slide rail 43.

[0027] The working principle of this utility model is as follows: The magnetostrictive displacement sensor assembly to be tested is fixed on the detection stage 1 by the sensor fixing base assembly. The magnetic ring 23 and the grating ruler displacement sensor 32 are both fixed on the displacement reciprocating sliding member 42. In manual mode, the magnetic ring 23 is moved left and right to observe whether there is any jamming or interference. According to the stroke parameters and data mode of the grating ruler displacement sensor 32, the displacement linear drive assembly is driven to operate under the control of the control system to enter the detection mode, so that the magnetic ring 23 starts to move from the right end to the left end. According to the stroke requirements, it moves to the left side. The left position must be outside the zero zone. The zero zone has been preset according to the sensor parameters during the program setting. The grating ruler displacement sensor 32 and the magnetic ring 23 run synchronously. The displacement data of the magnetic ring 23 and the displacement data of the grating ruler displacement sensor 32 are collected through different acquisition modules. The control system judges whether the measurement accuracy of the magnetostrictive displacement sensor meets the set requirements and makes a pass or fail judgment. That is, the accuracy detection is completed by comparing the displacement data of the magnetic ring 23 and the displacement data of the grating ruler displacement sensor 32.

[0028] After the test is completed, the display screen automatically records the travel curve and position accuracy, and finally determines whether the sensor accuracy is qualified.

[0029] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder displacement sensor accuracy detection device, comprising a detection platform (1), a magnetostrictive displacement sensor assembly to be tested, a grating ruler displacement sensor assembly, and a linear displacement drive assembly. The magnetostrictive displacement sensor assembly to be tested includes a magnetostrictive displacement sensor (21), a displacement sensor guide rod (22), and a magnetic ring (23). The magnetic ring (23) reciprocates along the displacement sensor guide rod (22). The grating ruler displacement sensor assembly includes a grating ruler (31) and a grating ruler displacement sensor (32) corresponding to the grating ruler (31). The linear displacement drive assembly includes a displacement drive element (41) and a displacement reciprocating slider (42). The displacement reciprocating slider (42) is connected to the grating ruler displacement sensor (32) and the magnetic ring (23) respectively, and drives the displacement reciprocating slider (42) to drive the grating ruler displacement sensor (32) and the magnetic ring (23) to reciprocate through the displacement drive element (41).

2. The precision detection device for the displacement sensor of the oil cylinder according to claim 1, characterized in that: The magnetostrictive displacement sensor assembly to be tested is fixed on the testing stage (1) by a sensor mounting bracket assembly.

3. The precision detection device for the displacement sensor of the oil cylinder according to claim 2, characterized in that: The sensor mounting assembly includes a perforated mounting base (51) and a perforated mounting rail (52) disposed on the top surface of the perforated mounting base (51).

4. The precision detection device for the displacement sensor of the oil cylinder according to claim 1, characterized in that: The displacement linear drive assembly is an electric linear screw module. The displacement reciprocating slider (42) is connected to the linear slide rail (43) by a sliding hook. The displacement reciprocating slider (42) is connected to the screw sleeve of the electric linear screw module.

5. The hydraulic cylinder displacement sensor accuracy detection device according to claim 1, characterized in that: The grating ruler displacement sensor (32) and the magnetic ring (23) are both connected to the displacement reciprocating sliding member (42) by bolts.

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