Locking force detection method for composite roller hydraulic nut

Abstract

The invention relates to a locking force detection method for a composite roller hydraulic nut. A locking force detection method for a composite roller hydraulic nut comprises the following steps that S1, a roller ring and a spacer ring are sequentially arranged on a roller shaft in a sleeving mode, then a hydraulic nut assembly is installed, and the outer ring end face of the hydraulic nut assembly is made to be tightly attached to the roller ring; s2, high-pressure oil is injected into a pressure cavity through an oil injection port of a hydraulic nut assembly, and a locking ring is screwed down after pressure is maintained for a set time length; s3, the roller shaft is sleeved with a detection device, the detection device comprises a gauge stand dial indicator, the reading of the dial indicator at the moment is recorded, and a first reading is obtained; s4, the oil pressure in the pressure cavity is removed, the reading of the dial indicator is read, and a second reading is obtained; and S5, calculating the difference value between the first reading and the second reading to obtain the axial displacement of the locking ring, comparing the axial displacement with a marked value, and judging whether the residual locking force meets the design requirement or not. The device has the advantages of being low in production, use and maintenance cost, low in requirement for detection personnel and convenient to detect.

Description

TECHNICAL FIELD

[0001] The application relates to a locking force detection method for a composite roll hydraulic nut. BACKGROUND

[0002] During assembly of the composite roll, locking force test needs to be performed to determine whether the assembled composite roll meets product requirements.

[0003] A device and method for testing the hydraulic locking force of a composite roll are disclosed in Chinese Patent No. 202510801414.2, which sets an annular pressure sensor between the roll ring, the spacer ring and the hydraulic nut, measures the transmission attenuation of the axial locking force in the multi-layer structure, and is used to evaluate whether the locking force is sufficient to overcome the friction between the layers, thereby avoiding slipping of the roll ring of the composite roll in production.

[0004] However, the above scheme has the following defects: the structure is complex, the machining cost is extremely high, and more sensors are used, which ultimately leads to high production and maintenance costs. SUMMARY

[0005] The purpose of the present application is to provide a composite roll hydraulic nut locking force detection method which has low production and maintenance costs and can be used for hydraulic nut locking force detection.

[0006] To achieve the above purpose, the application adopts a composite roll hydraulic nut locking force detection method, characterized by comprising the following steps: S1. The roll ring and the spacer ring are successively sleeved on the roll shaft, and then the hydraulic nut assembly is installed, the inner ring of the hydraulic nut assembly is tightened, and the outer ring end face of the hydraulic nut assembly is tightly attached to the roll ring; S2. High-pressure oil is injected into the pressure cavity through the oil injection port of the hydraulic nut assembly, and under the hydraulic action, the outer ring is pushed to press the roll ring and the spacer ring, and the locking ring is tightened after the pressure holding time is set; S3. A detection device is sleeved on the roll shaft, the detection device comprises a dial seat support, an adjusting screw and a dial indicator, the dial seat support is fixed with the roll shaft by the adjusting screw, the dial indicator is adjusted respectively so that the contact is in contact with the end face of the locking ring away from the roll ring, and the reading of the dial indicator at this time is recorded to obtain a first reading; S4. The oil pressure in the pressure cavity is removed, the axial reaction force of the outer ring on the locking ring causes the axial displacement of the locking ring, the reading of the dial indicator is read, and a second reading is obtained; S5. The difference between the first reading and the second reading is calculated to obtain the axial displacement of the locking ring, and based on the displacement and the elastic stiffness of the locking ring, the residual locking force is compared with a standard value to determine whether the residual locking force meets the design requirements.

[0007] The locking force of the standard part is detected in advance to obtain a standard value of composite requirements; or the same method, same steps and same data are used to detect multiple composite rollers, and the values are drawn into a table and corresponded to the material of the locking ring, and the corresponding value of the composite requirements is taken as a comparison value. The axial displacement amount of the locking ring is obtained by the method, compared with the standard, so that whether the locking force is sufficient can be directly judged.

[0008] When the present application is used, the assembly of the roll ring, the spacer ring and the hydraulic nut assembly is carried out according to the normal production process, and the subsequent pressing, pressure maintaining and tightening of the locking ring is also the normal production process, so that the production and detection are synchronized, more time is saved, and the operation is more convenient. Only the use and reading of the dial gauge are needed, ordinary personnel can use it, and the requirement for the detection personnel is lower. The equipment used in the present application has a simple structure, the cost of the dial gauge is low, no electric control operation is needed, it can be used in complex environment, is not easy to be damaged, and has lower maintenance cost.

[0009] As preferred, the number of the dial gauges is at least three, in step S3, the readings of each dial gauge are recorded, and the average of all readings is taken as the first reading; in step S4, the readings of each dial gauge are recorded, and the average of all readings is taken as the second reading.

[0010] As preferred, the dial gauges are in contact with the roll ring under pre-pressure, and the contact displacement amount of the dial gauges is a fixed value.

[0011] As preferred, the fixed value is 2mm.

[0012] As preferred, the table seat support has a plurality of extension parts extending along the axial direction of the roll shaft, and the ends of the extension parts away from the dial gauges are fixed with a fixed plate, and the fixed plate is fixed with the end of the roll shaft through a fixed screw. Through the above setting, the stability of the table seat support and the dial gauges can be maintained, and axial positioning can be realized, so that all dial gauges can have the same pre-pressure in contact with the locking ring.

[0013] As preferred, the table seat support is annular or C-shaped, and a plurality of adjusting screws are annularly and uniformly spaced on the table seat support.

[0014] The present application has the advantages of low production and maintenance cost, low requirement for detection personnel and convenient detection. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram when the method of the present application is used.

[0016] Figure 2 is another structural schematic diagram when the method of the present application is used.

[0017] Figure 3This is an enlarged view of the locking ring when the method of the present invention is used. Detailed Implementation

[0018] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0019] Depend on Figures 1 to 3 As shown in this embodiment, to achieve the above objective, the present invention employs a method for detecting the locking force of a composite roller hydraulic nut, comprising the following steps: S1. Install the roller ring 1 and the spacer ring 2 onto the roller shaft 3 in sequence, then install the hydraulic nut assembly 4, tighten the inner ring 41 of the hydraulic nut assembly 4, so that the end face of the outer ring 42 of the hydraulic nut assembly 3 is close to the roller ring 1. S2. High-pressure oil is injected into the pressure chamber through the oil inlet of the hydraulic nut assembly 3. Under hydraulic action, the outer ring 42 is pushed to press the roller ring 1 and the spacer ring 2 together. After holding the pressure for a set time, the locking ring 5 (mechanical nut) is tightened. S3. Install the detection device 6 on the roller 3. The detection device 6 includes a dial indicator bracket 61, an adjusting screw 62 and four dial indicators 63. Fix the dial indicator bracket 61 to the roller 3 with the adjusting screw 62, and adjust each dial indicator 63 so that its contact is in contact with the end face of the locking ring 5 away from the roller ring 5. Record the readings of each dial indicator at this time, and take the average of these readings as the first reading. S4. Release the oil pressure in the pressure chamber. The axial reaction force generated by the outer ring 42 on the locking ring 5 causes the locking ring to move axially. Record the readings of each dial indicator at this time, and use the average of these readings as the second reading. S5. Calculate the difference between the first reading and the second reading to obtain the axial displacement of the locking ring 5. Based on this displacement and the elastic stiffness of the locking ring 5, compare it with the standard value to determine whether the remaining locking force meets the design requirements.

[0020] In step 2, the dial indicator 63 is subjected to pre-pressure and comes into contact with the roller ring, and the displacement of the dial indicator's contact is fixed at 2 mm.

[0021] Depend on Figure 2 As shown, the table base bracket 61 has several extensions 611 extending axially along the roller shaft 3. The ends of each extension 611 are fixed to a fixing plate 612, which is then fixed to the ends of the roller shaft 3 by fixing screws. Figure 1 As shown, the meter base bracket 61 is circular, and several adjusting screws 62 are evenly spaced in a ring on the meter base bracket 61.

[0022] This embodiment has the advantages of low production and maintenance costs, low requirements for testing personnel, and convenient testing.

Claims

1. A method for detecting the locking force of a hydraulic nut for a composite roller, characterized in that... Includes the following steps: S1. Install the roller ring and spacer ring onto the roller shaft in sequence, then install the hydraulic nut assembly and tighten the inner ring of the hydraulic nut assembly so that the outer ring end face of the hydraulic nut assembly is in close contact with the roller ring; S2. High-pressure oil is injected into the pressure chamber through the oil inlet of the hydraulic nut assembly. Under hydraulic action, the outer ring is pushed to press the roller ring and the spacer ring together. The locking ring is tightened after the pressure is held for a set time. S3. Install a detection device on the roller shaft. The detection device includes a dial indicator bracket, an adjusting screw, and a dial indicator. Fix the dial indicator bracket to the roller shaft with the adjusting screw, and adjust the dial indicator so that its contact is in contact with the end face of the locking ring away from the roller ring. Record the reading of the dial indicator at this time to obtain the first reading. S4. Release the oil pressure in the pressure chamber. The axial reaction force generated by the outer ring on the locking ring causes the locking ring to move axially. Read the dial indicator reading to obtain the second reading. S5. Calculate the difference between the first reading and the second reading to obtain the axial displacement of the locking ring. Based on this displacement and the elastic stiffness of the locking ring, compare it with the standard value to determine whether the remaining locking force meets the design requirements.

2. The method for detecting the locking force of a hydraulic nut for a composite roller according to claim 1, characterized in that: The number of dial gauges is at least three. In step S3, the reading of each dial gauge is recorded, and the average of all readings is taken as the first reading. In step S4, the reading of each dial gauge is recorded, and the average of all readings is taken as the second reading.

3. The method for detecting the locking force of a hydraulic nut for a composite roller according to claim 1, characterized in that: The dial indicator is subjected to pre-pressure and contacts the roller ring, so that the displacement of the dial indicator's contact is a fixed value.

4. The method for detecting the locking force of the hydraulic nut for the composite roller according to claim 3, characterized in that: The fixed value is 2mm.

5. The method for detecting the locking force of a hydraulic nut for a composite roller according to claim 3 or 4, characterized in that: The dial indicator support has several extensions extending axially along the roller shaft. The ends of the extensions away from the dial indicator are all fixed to a fixing plate, which is fixed to the end of the roller shaft by fixing screws.

6. The method for detecting the locking force of a hydraulic nut for a composite roller according to claim 1, characterized in that: The watch base bracket is ring-shaped or C-shaped, and several adjusting screws are evenly spaced in a ring on the watch base bracket.

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