A special bolt used in the calibration device of a borehole modulus tester

Abstract

This invention provides a special bolt for use in a drilling modulus tester calibration device, comprising a screw system and a ball bearing system. The screw system includes a nut, a screw rod, and a bolt. One end of the screw rod is fixedly fitted with the nut, perpendicular to the screw rod. The screw rod has a smooth surface on the side near the nut and an external thread matching the nut on the side away from the nut. The nut has the ball bearing system perpendicular to the nut on the side away from the screw rod. This special bolt is used in applications requiring axial restraint and radial free sliding. When used in the calibration device of a drilling jack radial loading tester, it ensures that only radial free movement occurs in the inspection fixture holding the modulus measuring probe, thus giving the dial gauge reading mounted on top of the inspection fixture practical calibration significance.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical engineering investigation and testing technology, specifically relating to a special bolt used in the calibration device of a borehole elastic modulus instrument. Background Technology

[0002] Currently, when conducting in-situ deformation tests on rock masses, radial pressure can be applied to the borehole when it is necessary to determine the radial elastic modulus and deformation modulus of the rock mass within the borehole. In existing technologies, a radial loading test instrument for borehole jacks is typically used to conduct radial pressure tests on the borehole jacks, thereby verifying the radial displacement detected by the displacement sensors of the borehole jacks.

[0003] When using a radial loading tester with a drilling jack to calibrate a displacement sensor, the elastic modulus measuring probe of the drilling elastic modulus instrument is held by an upper and lower clamp. When pressure is applied to the elastic modulus measuring probe, the upper clamp not only moves radially but also tends to move axially, thus reducing the accuracy of the radial displacement detected by the displacement sensor. Therefore, how to ensure that the upper clamp only moves freely radially while constraining its axial movement through a simple structure is a key problem that needs to be solved. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a special bolt for use in a drilling modulus calibration device, which can effectively solve the above problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] This utility model provides a special bolt for use in a drilling elastic modulus calibration device, including a screw system and a ball bearing system; the screw system includes a nut (7), a screw (9) and a nut (11);

[0007] One end of the screw (9) is fixedly mounted with the nut (7) perpendicular to the screw (9); the screw (9) has a smooth surface on the side near the nut (7) and an external thread that matches the nut (11) on the side away from the nut (7); the ball bearing system is provided on the side of the nut (7) perpendicular to the nut (7).

[0008] Preferably, the screw (9) is cylindrical.

[0009] Preferably, nut fixed shaft wheels (8) perpendicular to the nut (7) are provided on both sides of the nut (7).

[0010] Preferably, the shaft of the nut fixed shaft wheel (8) is fixed in the middle of the groove of the nut (7); the nut fixed shaft wheel (8) can rotate freely in a plane perpendicular to the nut (7).

[0011] Preferably, the screw (9) has an axially oriented guide groove (12) at the end away from the nut (7).

[0012] Preferably, a washer (10) is fitted onto the external thread section of the screw (9) before the nut (11) is screwed in.

[0013] Preferably, the ball bearing system includes balls (1), an inner ring (2), an outer ring (3), a bearing rod (5), and a threaded pin (6);

[0014] One end of the threaded head pin (6) is fixed to the nut (7) at the center position on the side away from the screw (9); the other end of the threaded head pin (6) is equipped with the vertical bearing rod (5); the inner ring (2) is fixedly installed at both ends of the bearing rod (5); the outer ring (3) is rotatably installed on the outside of the inner ring (2) through the ball (1), and the rotation axis of the outer ring (3) is perpendicular to the axis of the screw (9).

[0015] Preferably, the threaded head pin (6) is threadedly connected to the nut (7).

[0016] Preferably, a retainer (4) is provided between each ball (1); the retainer (4) is made of non-metallic material.

[0017] Preferably, a rotary buckle (13) is provided between the threaded head pin (6) and the bearing rod (5).

[0018] The special bolt provided by this utility model for use in a drilling elastic modulus calibration device has the following advantages:

[0019] The special bolt provided by this utility model is used in application scenarios that require axial limiting and radial free sliding. When used in the calibration device of the radial loading tester of the drilling jack, it can ensure that only radial free movement occurs in the inspection fixture holding the elastic modulus measuring probe, so that the dial gauge reading mounted on the top of the inspection fixture has practical calibration significance. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the special bolt of this utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of the special bolt of this utility model;

[0022] Figure 3 This is a side view of the special bolt of this utility model.

[0023] Figure 4 for Figure 3 Sectional view along AA;

[0024] Figure 5 This is a side view of the special bolt of this utility model.

[0025] Figure 6 for Figure 5 Cross-sectional view and enlarged view along BB;

[0026] Figure 7 This is a structural diagram of the calibration device for the radial loading tester of the drilling jack of this utility model;

[0027] Figure 8 This is a cross-sectional view of the calibration device of the radial loading tester for drilling jacks of this utility model.

[0028] Figure 9 This is a three-dimensional structural diagram of the guide plate groove of this utility model;

[0029] Figure 10 This is an exploded view of the sliding concealed rail, sliding exposed groove, and sliding screw (i.e., special bolt) of this utility model.

[0030] In the picture:

[0031] 1-Ball; 2-Inner ring; 3-Outer ring; 4-Retainer; 5-Bearing rod; 6-Threaded pin; 7-Nut; 8-Nut fixed shaft wheel; 9-Screw; 10-Washer; 11-Nut; 12-Pointer groove; 13-Rotary snap-fit;

[0032] 21-Drilling jack; 22-Sliding screw; 23-Upper clamp module; 24-Dial indicator; 25-Guide plate groove; 26-Upper half ring plate; 27-Sliding concealed rail; 28-Lower half ring plate; 29-Sliding exposed groove; 30-Lower half ring plate fixing screw hole; 31-Drilling jack measuring probe; 32-Lower clamp module. Detailed Implementation

[0033] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0034] The implementation of this utility model is not limited by specific dimensions or materials, but can be adjusted and varied according to specific circumstances. Any modifications to the implementation method, component form, and materials of this testing and verification device, as long as these modifications and variations follow the basic structural composition of this utility model, fall within the protection scope of this utility model.

[0035] This utility model provides a special bolt for use in a drilling elastic modulus calibration device, which is a sliding screw, such as... Figures 1 to 6 As shown: It includes a screw system and a ball bearing system; the screw system includes a nut 7, a screw 9, and a nut 11;

[0036] The screw 9 is cylindrical, and a nut 7 perpendicular to the screw 9 is fixedly installed at one end of the screw 9; nut fixed shaft wheels 8 perpendicular to the nut 7 are set on both sides of the nut 7. The shaft of the nut fixed shaft wheel 8 is fixed in the middle of the groove of the nut 7; the nut fixed shaft wheel 8 can rotate freely in a plane perpendicular to the nut 7.

[0037] The screw 9 has an axially oriented guide groove 12 at the end away from the nut 7.

[0038] The screw 9 has a smooth surface on the side near the nut 7 and an external thread that matches the nut 11 on the side away from the nut 7; a washer 10 is fitted into the external thread section of the screw 9 before the nut 11 is screwed in.

[0039] Nut 7 has a ball bearing system perpendicular to it on the side away from screw 9.

[0040] The ball bearing system includes balls 1, inner ring 2, outer ring 3, bearing rod 5, and threaded pin 6;

[0041] One end of the threaded pin 6 is fixed to the nut 7 at the center position on the side away from the screw 9; the other end of the threaded pin 6 is fitted with a vertical bearing rod 5; inner rings 2 are fixedly mounted at both ends of the bearing rod 5; an outer ring 3 is rotatably mounted on the outside of the inner ring 2 via balls 1, the rotation axis of the outer ring 3 being perpendicular to the axis of the screw 9. Specifically, the balls 1 are spherical, made of high-hardness and wear-resistant steel, and roll between the inner ring 2 and the outer ring 3 to reduce friction and provide smooth rotation. The inner ring 2 is annular with an arc-shaped groove engraved on its outer edge. The inner ring 2 matches the diameter and shape of the bearing rod 5 to ensure a tight fit between the inner ring 2 and the shaft of the bearing rod 5. The outer ring 3 is annular with an arc-shaped groove engraved on its inner diameter surface, and is the part connecting the ball bearing system in the specific example support structure. The outer ring 3 surrounds the inner ring 2 and the balls 1, providing stable support and positioning for the entire ball bearing system.

[0042] In practical applications, a retainer 4 is provided between each ball 1. The retainer 4 is used to separate and maintain the appropriate spacing between the balls 1 to prevent the balls 1 from contacting each other and generating additional friction. The retainer 4 is made of non-metallic material and is designed to ensure the stability and uniform distribution of the balls 1 during rotation.

[0043] The bearing rod 5 is a round shaft with a mounting hole in the middle that mates with the threaded pin 6. The diameter and shape of the bearing rod 5 match those of the inner ring 2.

[0044] The threaded head pin 6 is a round shaft. One end is a rotating buckle 13 that connects the threaded head pin 6 to the bearing rod 5. The other end is a conventional threaded head that is threaded to the threaded hole at the center of the end plane of the nut 7, thereby realizing the threaded connection between the threaded head pin 6 and the nut 7.

[0045] In this application, the direction of the pointing groove 12, the rolling direction of the nut fixed shaft wheel 8, and the rotation direction of the outer ring 3 are parallel and in the same direction.

[0046] To facilitate understanding of the usage of the special bolt provided by this utility model, one possible usage scenario is as follows:

[0047] See Figures 7 to 10 Here are the relevant structural diagrams of the calibration device for the radial loading tester of the drilling jack using the special bolts provided by this utility model:

[0048] The guide plate groove 25 is a cuboid with an open top and one side end and closed other surfaces. The lower clamp module 32 and the upper clamp module 23 are arranged opposite each other inside the guide plate groove 25. The external shape of the lower clamp module 32 and the upper clamp module 23 matches the internal shape of the guide plate groove 25. The lower clamp module 32 and the upper clamp module 23 each have a semi-circular groove on their opposite sides. The upper and lower semi-circular grooves face each other to form a simulated drill hole that matches the shape of the drilling jack measuring probe 31, which is used to place the drilling jack measuring probe 31. A dial indicator 24 is fixedly installed on the top surface of the upper clamp module 23.

[0049] The drilling jack measuring probe 31 is coaxially fixed to one side of the end opening of the guide plate groove 25. The drilling jack 21 is located outside the guide plate groove 25.

[0050] The lower half-ring plate 28 is fixedly installed at the lower end opening of the guide plate groove 25 and at the end position of the lower clamping module 32 by fixing screws; the upper half-ring plate 26 is installed at the upper end opening of the guide plate groove 25 and at the end position of the upper clamping module 23 by sliding unit, and can slide up and down; the upper half-ring plate 26 limits the axial movement of the upper clamping module 23, so that the upper clamping module 23 can only move radially along the guide plate groove 25.

[0051] The sliding unit includes a sliding screw 22, a sliding concealed rail 27, and a sliding exposed groove 29; the sliding screw 22 is the special bolt provided in this application;

[0052] At the upper part of the end opening of the guide plate groove 25, at the same height as the initial position of the upper half ring plate 26, a through sliding groove 29 and a sliding rail 27 are provided from front to back. One end of the sliding screw 22 passes through the upper half ring plate 26 and extends into the sliding groove 29 and the sliding rail 27, and can slide radially along the sliding groove 29 and the sliding rail 27. The other end of the sliding screw 22 is located on the outside of the upper half ring plate 26 and is locked by the nut 11. This limits the axial position of the upper half ring plate 26, so that the upper half ring plate 26 can only move radially relative to the guide plate groove 25.

[0053] Specifically, the smooth round rod of the screw 9 passes through the upper half-ring plate 26 and extends into the sliding groove 29, and can slide radially along the sliding groove 29; the nut 7 is located on the rear side of the sliding groove 29, and its diameter is larger than the width of the sliding groove 29. At the same time, the nut fixed shaft wheel 8 set on the nut 7 can also assist in radial sliding along the rear side wall of the sliding groove 29; the inner ring 2, the ball 1 and the outer ring 3 form a pulley unit, which is located in the sliding dark rail 27 and slides radially along the sliding dark rail 27; the threaded rod of the screw 9 is located outside the upper half-ring plate 26 and is locked by the nut 11. By cooperating with the nut 7, axial limiting is achieved.

[0054] Therefore, during the stepwise radial loading test on the drilling jack measuring probe 31, when the drilling jack measuring probe 31 undergoes radial elastic deformation, the upper clamp module 23 will move freely radially under the limiting of the guide plate groove and the axial limiting of the upper half ring plate 26. At the same time, when the upper clamp module 23 moves freely radially, the upper half ring plate 26 also moves freely radially under the action of the sliding screw 22. When the upper half ring plate 26 moves freely radially, the radial displacement is recorded by the dial gauge 24. By comparing it with the displacement recorded by the potentiometric displacement sensor, the displacement recorded by the dial gauge is verified.

[0055] The special bolt provided by this utility model is a novel bolt that enables the upper half-ring plate 26 in the drilling modulus calibration device to move freely in the radial direction within the guide plate groove 26. The novel bolt slides freely along two predetermined parallel tracks, the width of which is approximately equal to the bolt diameter of the novel bolt proposed in this utility model. Simultaneously, the upper half-ring plate 26 is axially fixed to the guide plate groove 25 by the novel bolt, achieving horizontal axial constraint, which is solved by the nut component of the special bolt proposed in this utility model being stuck within the predetermined dark track. The technical goal of vertical free movement is achieved by the novel bolt proposed in this utility model entering the dark track within the predetermined parallel track through the nut inlet, and then sliding at the bottom of the dark track by a ball bearing system.

[0056] Therefore, the special bolt provided by this utility model is used in application scenarios that require axial limiting and radial free sliding. The calibration device of the radial loading tester for drilling jacks described above is only one application scenario for the special bolt, and it can also be used in other scenarios. This application does not limit it.

[0057] The beneficial effects of this utility model are as follows:

[0058] When the borehole modulus tester is calibrated, it can ensure that only radial free movement occurs in the inspection fixture holding the modulus measuring probe, so that the dial gauge reading mounted on the top of the inspection fixture has practical calibration significance.

[0059] The novel bolt proposed in this utility model, considering the practicality of the bolt as a small structure, uniquely employs two types of wheels: a ball bearing at the top of the nut and a fixed-axis wheel with grooves inside the nut. When the nut is completely placed within the concealed track, the upper half of the ring plate of this special bolt, used in a drilling modulus calibration device, can move freely in a specific embodiment.

[0060] To reduce the failure rate when the outer ring of the ball bearing system moves in the dark track in the specific embodiment, this utility model adopts a universal wheel structure, that is, a free-rotating buckle is set at the connection between the threaded pin and the bearing rod.

[0061] When the special bolt proposed in this utility model is implemented in the drilling elastic modulus calibration device, a guide groove is provided to indicate the placement direction of the nut fixed shaft wheel. When the nut fixed shaft wheel extends into the sliding dark rail, the movement direction of the nut roller can still be clearly defined. In actual implementation, the rotation direction can be manually adjusted by the tail end of the screw so that the nut fixed shaft wheel can still be preset in the track direction parallel to the specific embodiment. Then, it can be fixed with a washer and nut.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A special bolt used in a drilling modulus calibration device, characterized in that, It includes a screw system and a ball bearing system; the screw system includes a nut (7), a screw (9), and a nut (11); One end of the screw (9) is fixedly mounted with the nut (7) perpendicular to the screw (9); the screw (9) has a smooth surface on the side near the nut (7) and an external thread that matches the nut (11) on the side away from the nut (7); the ball bearing system is provided on the side of the nut (7) perpendicular to the nut (7).

2. A special bolt for use in a calibration device for a bullet impact velocity meter according to claim 1, characterized in that, The screw (9) is cylindrical.

3. A special bolt used in a drilling modulus calibration device according to claim 1, characterized in that, Nut fixed shaft wheels (8) perpendicular to the nut (7) are provided on both sides of the nut (7).

4. A special bolt for use in a device for calibrating a bullet impact tester according to claim 3, wherein The shaft of the nut fixed shaft wheel (8) is fixed in the middle of the groove of the nut (7); the nut fixed shaft wheel (8) can rotate freely in a plane perpendicular to the nut (7).

5. A special bolt for use in a device for calibrating a bullet impact tester according to claim 1, wherein The screw (9) has an axially oriented guide groove (12) at the end away from the nut (7).

6. A special bolt for use in a device for calibrating a bullet impact tester according to claim 1, wherein The screw (9) has a washer (10) fitted onto its external threaded section, and then the nut (11) is screwed in.

7. A special bolt for use in a device for calibrating a bullet impact tester according to claim 1, wherein The ball bearing system includes balls (1), an inner ring (2), an outer ring (3), a bearing rod (5), and a threaded pin (6); One end of the threaded head pin (6) is fixed to the nut (7) at the center position on the side away from the screw (9); the other end of the threaded head pin (6) is equipped with the vertical bearing rod (5); the inner ring (2) is fixedly installed at both ends of the bearing rod (5); the outer ring (3) is rotatably installed on the outside of the inner ring (2) through the ball (1), and the rotation axis of the outer ring (3) is perpendicular to the axis of the screw (9).

8. A special bolt for use in a device for calibrating a bullet impact tester according to claim 7, characterized in that, The threaded head pin (6) is threadedly connected to the nut (7).

9. A special bolt for use in a device for calibrating a bullet impact tester according to claim 7, characterized in that, A retainer (4) is provided between each ball (1); the retainer (4) is made of non-metallic material.

10. A special bolt for use in a device for calibrating a bullet impact tester according to claim 7, characterized in that, A rotary buckle (13) is provided between the threaded pin (6) and the bearing rod (5).

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