Bolt pretightening force press machine calibration experiment device

Abstract

A bolt pre-tightening force press machine calibration experiment device comprises a pressure device and a detection device, the pressure device comprises a first groove-shaped seat, a second groove-shaped seat and a pressing plate, a notch of the second groove-shaped seat faces downwards, the pressing plate is located in the second groove-shaped seat, a notch of the first groove-shaped seat faces downwards, the second groove-shaped seat is located in a notch of the first groove-shaped seat, and the pressing plate is located in the second groove-shaped seat. The two ends of the lower side of the first groove-shaped base abut against the two ends, extending out of the second groove-shaped base, of the pressing plate respectively, a first insertion hole is formed in the second groove-shaped base, and a second insertion hole is formed in the pressing plate. The detection device comprises a bolt monitoring sensor. The pressure device is used for installing the matched screw rod and nut and applying pulling force to the screw rod and the nut, and the pre-tightening force of the screw rod and the nut is measured through the detection device. The device is simple in structure, convenient in pressure application, simple in operation and high in detection and calibration efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of bolt pre-tightening force detection, in particular to a calibration experimental device for bolt pre-tightening force press. Background Technique

[0002] In the field of bolt pre-tightening force detection, accurately and reliably measuring the pre-tightening force of bolts is crucial for ensuring the safe operation of equipment. Traditional bolt pre-tightening force calibration methods often have the problem of complex operation and cannot meet the requirements for rapid detection of bolt pre-tightening force. Therefore, an experimental device with a simple structure, convenient operation, and capable of realizing rapid detection and calibration of bolt pre-tightening force is needed.

[0003] In the prior art, CN209858123U, publication (announcement) date: December 27, 2019, discloses a new type of bolt pre-tightening force detection device. Through this device, the pre-tightening force of the screw can be adjusted. However, this device has the following deficiencies: First, the screw to be measured is connected to the standard threaded hole on the base, and the pre-tightening force of the matching screw and nut cannot be measured. Since the pre-tightening forces of screws and nuts with different performance grades vary greatly, such as 4.8 grade, 8.8 grade, and 12.9 grade, etc., it is necessary to detect in combination with screws and nuts. Second, by rotating the pressure adjustment knob to apply pressure to the standard bolt, the applied pressure is inconvenient and the operation is complex, affecting the detection efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a calibration experimental device for bolt pre-tightening force press, which can measure the pre-tightening force of the matching screw and nut, and has a simple structure, convenient pressure application, simple operation, and high detection and calibration efficiency.

[0005] To achieve the above purpose, the utility model provides a calibration experimental device for bolt pre-tightening force press, including a pressure device and a detection device. The pressure device includes a first trough-shaped seat, a second trough-shaped seat, and a pressing plate. The notch of the second trough-shaped seat faces downward, and the pressing plate is located inside the second trough-shaped seat. The notch of the first trough-shaped seat faces downward, and the second trough-shaped seat is located inside the notch of the first trough-shaped seat. The two ends of the lower side of the first trough-shaped seat respectively abut against the two ends of the pressing plate extending out of the second trough-shaped seat. A first insertion hole is provided on the second trough-shaped seat, and a second insertion hole is provided on the pressing plate. The detection device includes a bolt monitoring sensor. During the experiment, the threaded end of the screw passes through the first insertion hole and the second insertion hole from top to bottom and is then installed with a nut, and the bolt monitoring sensor is installed on the screw.

[0006] The bolt monitoring sensor adopts an electromagnetic ultrasonic sensor, and the bolt monitoring sensor is screwed to the end of the threaded end of the screw.

[0007] The detection device further includes a thread stress meter, and the thread stress meter is electrically connected to the bolt monitoring sensor through a cable.

[0008] A stress-bearing block is arranged at the top of the first trough-shaped seat, and a positioning groove is arranged at the top of the stress-bearing block.

[0009] Load-bearing columns are arranged between the stress-bearing block and the first trough-shaped seat, reinforcing plates are respectively arranged on both sides of the load-bearing columns, and the upper and lower ends of the reinforcing plates are respectively connected to the stress-bearing block and the first trough-shaped seat.

[0010] The pressure device further includes a cushion block, and the cushion block is used to be placed between the first trough-shaped seat and the pressing plate, and / or placed at the bottom on both sides of the second trough-shaped seat.

[0011] Limit holes and limit posts are respectively arranged on the opposite sides of the cushion block, a first positioning hole is arranged at the bottom of the second trough-shaped seat, and second positioning holes are respectively arranged at both ends of the upper side of the pressing plate.

[0012] Compared with the prior art, the utility model has the following technical effects:

[0013] The pressure device of the utility model is used to install a matching screw rod and nut, apply a tensile force to the screw rod and nut, and measure the pre-tightening force of the screw rod and nut through the detection device. The bolt monitoring sensor is screwed and installed at the end of the threaded end of the screw rod. After applying pressure to the pressure device, a tensile force is applied to the screw rod, so as to detect and calibrate the pre-tightening force of the screw rod and nut through the detection device. The utility model has a simple structure, convenient pressure application, simple operation, and high detection and calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art.

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] Figure 2 It is a schematic diagram of the structure of the pressure device of the utility model.

[0017] Figure 3 It is Figure 2 The schematic diagram of the A-A sectional structure in

[0018] Figure 4 It is an exploded view of the pressure device of the utility model.

[0019] In the figure:

[0020] Pressure device 100, first trough-shaped seat 110, load-bearing column 111, force-receiving block 112, positioning groove 113, rib plate 114, second trough-shaped seat 120, first insertion hole 121, first positioning hole 122, pressing plate 130, second insertion hole 131, second positioning hole 132, spacer 140, limit hole 141, limit post 142;

[0021] Detection device 200, bolt monitoring sensor 201, thread stress gauge 202, cable 203;

[0022] Screw 300, nut 301. Specific implementation

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] Please refer to Figures 1-4 , a calibration experiment device for bolt pre-tightening force press, including a pressure device 100 and a detection device 200. The pressure device 100 includes a first trough-shaped seat 110, a second trough-shaped seat 120, and a pressing plate 130. The notch of the second trough-shaped seat 120 faces downward, the pressing plate 130 is located inside the second trough-shaped seat 120, the notch of the first trough-shaped seat 110 faces downward, the second trough-shaped seat 120 is located inside the notch of the first trough-shaped seat 110, and the two ends of the lower side of the first trough-shaped seat 110 respectively abut against the two ends of the pressing plate 130 extending out of the second trough-shaped seat 120. The second trough-shaped seat 120 is provided with a first insertion hole 121, and the pressing plate 130 is provided with a second insertion hole 131. The detection device 200 includes a bolt monitoring sensor 201. During the experiment, the threaded end of the screw 300 is installed with a nut 301 after passing through the first insertion hole 121 and the second insertion hole 131 from top to bottom. The bolt monitoring sensor 201 is installed on the screw 300, and the operation is simple.

[0025] The pressure device 100 is used to install the matching screw 300 and nut 301, apply a tensile force to the screw 300 and nut 301, and measure the pre-tightening force of the screw 300 and nut 301 through the detection device 200. The present invention has a simple structure, convenient pressure application, simple operation, and high detection and calibration efficiency.

[0026] In this embodiment, the bolt monitoring sensor 201 adopts an electromagnetic ultrasonic sensor, and the bolt monitoring sensor 201 is screwed to the end of the threaded end of the screw 300.

[0027] Specifically, the bolt monitoring sensor 201 adopts an electromagnetic ultrasonic dual-wave bolt monitoring sensor of model ST100 from Suzhou Bosheng Technology Co., Ltd.

[0028] Further, the detection device 200 further includes a thread stress gauge 202, and the thread stress gauge 202 is electrically connected to the bolt monitoring sensor 201 through a cable 203. The thread stress gauge 202 adopts an electromagnetic ultrasonic double-wave bolt stress gauge ST100. The electromagnetic ultrasonic double-wave bolt stress gauge adopts electromagnetic ultrasonic double-wave in-situ axial force detection technology, which can measure in-service high-strength bolts without knowing the original state of each bolt. When measuring, no coupling agent needs to be applied to the bolt, and no plane needs to be polished. Bolts with raised characters on the bolt head, thin-diameter stud bolts, bolts with internal hexagonal holes, and bolts with concave surfaces can be directly measured.

[0029] See Figure 4 , a force-bearing block 112 is arranged on the top of the first trough-shaped seat 110, and a positioning groove 113 is arranged on the top of the force-bearing block 112. The positioning groove 113 is used to align with the telescopic rod of the hydraulic press, so that the telescopic rod can press down on the middle of the first trough-shaped seat 110 of the pressure device 100, making the pressure device 100 stress-balanced.

[0030] Further, a load-bearing column 111 is arranged between the force-bearing block 112 and the first trough-shaped seat 110. Reinforcing plates 114 are respectively arranged on both sides of the load-bearing column 111, and the upper and lower ends of the reinforcing plates 114 are respectively connected to the force-bearing block 112 and the first trough-shaped seat 110. The height of the first trough-shaped seat 110 is increased, which is convenient for taking.

[0031] In order to detect and calibrate bolts 300 of different lengths, it is necessary to adjust the distance between the first trough-shaped seat 110 and the pressing plate 130, or it is necessary to adjust the distance between the second trough-shaped seat 120 and the base, or both the distance between the first trough-shaped seat 110 and the pressing plate 130 and the distance between the second trough-shaped seat 120 and the base need to be adjusted. Therefore, the pressure device 100 further includes a spacer block 140. The spacer block 140 is used to be placed between the first trough-shaped seat 110 and the pressing plate 130, and / or placed at both bottom sides of the second trough-shaped seat 120 for adjustment through the spacer block 140.

[0032] See Figure 4 , in order to improve the stability of the placement of the spacer block, limiting holes 141 and limiting posts 142 are respectively arranged on opposite sides of the spacer block 140. A first positioning hole 122 is arranged at the bottom of the second trough-shaped seat 120, and second positioning holes 132 are respectively arranged at both upper ends of the pressing plate 130. When the spacer blocks 140 are stacked, the limiting posts 142 of adjacent spacer blocks 140 are inserted into the limiting holes 141. When the spacer block 140 is located above the pressing plate 130, the limiting posts 142 of the bottom spacer block 140 are inserted into the second positioning holes 132. When the spacer block 140 is located below the second trough-shaped seat 120, the limiting posts 142 of the uppermost spacer block 140 are inserted into the first positioning holes 122.

[0033] The working principle or operation process of the present utility model is as follows:

[0034] See Figure 1 , when in use, the pressure device 100 with the bolt 300 and the nut 301 installed is placed on the base of the press. The bolt monitoring sensor 201 is screwed onto the end of the threaded end of the screw 300, and the thread stress gauge 202 is electrically connected to the bolt monitoring sensor 201 through the cable 203.

[0035] The telescopic rod of the press is aligned with the positioning groove 113 and pressed downwards. Pressure is applied to the pressure device 100 by the press, which is convenient for applying pressure. When the bolt 301 is subjected to tensile force, its length will change. By using the acoustoelastic effect of longitudinal waves in ultrasonic waves, the detection device 200 can explore the linear relationship between the acoustic time difference and stress. Thus, the axial stress of the bolt can be monitored, and the corresponding coefficient parameters can be calibrated. Therefore, when applied to the actual working environment, after setting the bolt length, the clamping working length and other relevant parameters, the detection device 200 can directly measure the corresponding pre-tightening force value, and can determine the threshold value of the bolt pre-tightening force according to the strength grade and other parameters of the bolt, judge the loosening, fracture and other conditions of the bolt, give a pre-tightening signal in advance, which is convenient for making equipment maintenance actions in advance, and greatly improves the safety of the monitored equipment.

Claims

1. A bolt preload press calibration experimental device, characterized in that: The invention comprises a pressure device (100) and a detection device (200), wherein the pressure device (100) comprises a first groove-shaped seat (110), a second groove-shaped seat (120) and a pressing plate (130), wherein the notch of the second groove-shaped seat (120) faces downward, the pressing plate (130) is located in the second groove-shaped seat (120), the notch of the first groove-shaped seat (110) faces downward, the second groove-shaped seat (120) is located in the notch of the first groove-shaped seat (110), and the lower ends of the first groove-shaped seat (110) respectively abut against the pressing plate (130). 130) extends out from both ends of the second slot-shaped seat (120), the second slot-shaped seat (120) is provided with a first insertion hole (121), and the pressure plate (130) is provided with a second insertion hole (131); the detection device (200) includes a bolt monitoring sensor (201), during the experiment, the threaded end of the screw rod (300) is installed with a nut (301) after passing through the first insertion hole (121) and the second insertion hole (131) from top to bottom, and the bolt monitoring sensor (201) is installed on the screw rod (300).

2. A bolt preload press calibration experimental device (10) according to claim 1, characterized in that: The bolt monitoring sensor (201) is an electromagnetic ultrasonic sensor, and the bolt monitoring sensor (201) is screwed onto the end of the threaded end of the screw rod (300).

3. A bolt preload press calibration experimental device (10) according to claim 2, characterized in that: The detection device (200) further comprises a thread stress meter (202), and the thread stress meter (202) is electrically connected to the bolt monitoring sensor (201) via a cable (203).

4. The bolt preload press calibration test device (10) according to claim 1, characterized in that: A force-bearing block (112) is provided at the top of the first groove-shaped seat (110), and a positioning groove (113) is provided at the top of the force-bearing block (112).

5. The bolt preload press calibration test device (10) according to claim 4, characterized in that: A load-bearing column (111) is provided between the load-bearing block (112) and the first slot-shaped seat (110), and rib plates (114) are provided on both sides of the load-bearing column (111), and the upper and lower ends of the rib plates (114) are respectively connected to the load-bearing block (112) and the first slot-shaped seat (110).

6. The bolt preload press calibration test device (10) according to claim 1, characterized in that: The pressure device (100) further comprises a cushion block (140), wherein the cushion block (140) is used to be placed between the first groove-shaped seat (110) and the pressure plate (130), and / or placed at the bottom of both sides of the second groove-shaped seat (120).

7. A bolt preload press calibration test device (10) according to claim 6, characterized in that: The cushion block (140) is provided with limiting holes (141) and limiting columns (142) on opposite sides thereof, the bottom of the second slot-shaped seat (120) is provided with a first positioning hole (122), and the upper ends of the pressure plate (130) are provided with second positioning holes (132).

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