Auxiliary mechanism for testing pre-tightening force of bolt

Abstract

The invention provides a bolt pre-tightening force test auxiliary mechanism. The bolt pre-tightening force test auxiliary mechanism comprises a bolt mounting mechanism and a protective blocking mechanism, the bolt mounting mechanism comprises a mounting base and two test cylinders, a containing sliding groove is transversely formed in the top surface of the mounting base in a penetrating mode, the two test cylinders are concentric, right opposite and slidably arranged in the containing sliding groove, and one test cylinder is provided with a pressure sensor right opposite to the other test cylinder; the protection blocking mechanism comprises two blocking absorption covers, the two blocking absorption covers are arranged outside the containing sliding groove and right face the testing cylinder, and damping structures are arranged in the blocking absorption covers. The bolt pre-tightening force testing device is compact in structure, simple and convenient in manufacturing process, capable of greatly improving the safety performance in the bolt pre-tightening force testing process, has certain universality, can be suitable for bolt pre-tightening force testing sites of different specifications and models, can greatly improve the production efficiency when being applied to bolt pre-tightening force testing, and has obvious economic benefits.

Description

Technical Field

[0001] The invention belongs to the field of bolt prestress testing, and in particular relates to a bolt pretightening force testing auxiliary mechanism. Background Art

[0002] Bolt preload is the preload force generated along the bolt axis between the bolt and the connected parts by the tightening torque during the tightening process. The preload can prevent the bolt from loosening due to vibration, temperature changes and other factors during operation, thereby improving the stability and safety of the connection. At the same time, the preload can also enhance the tightness and rigidity of the connection and improve the overall performance of the equipment. Therefore, it is particularly necessary to test the preload of the bolt.

[0003] When testing the bolt preload force using a conventional bolt preload test device, the bolts are usually tightened with a relatively high preload force, and the bolted joints often break, fall off, collapse and splash. If no external protective measures are taken, it will cause injuries or damage to personnel or the external environment, which brings the problem of low safety to the bolt preload force test. Summary of the invention

[0004] In view of this, the present invention aims to provide a bolt preload test auxiliary mechanism to improve the safety performance during the preload test.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A bolt preload force test auxiliary mechanism, comprising a bolt installation mechanism and a protective blocking mechanism;

[0007] The bolt installation mechanism comprises a mounting seat and a test tube, wherein a receiving slot is formed through the top surface of the mounting seat, and two test tubes are concentric, facing and slidably arranged in the receiving slot, wherein a pressure sensor is arranged on one of the test tubes facing the other test tube;

[0008] The protective blocking mechanism comprises two blocking absorption covers, which are arranged outside the accommodating slide groove and face the two test cylinders, and a damping structure is arranged inside the blocking absorption cover.

[0009] Furthermore, the damping structure includes a port of the cover shell of the blocking absorption cover that is arranged opposite to the test tube, a blocking piece clamped to the port, and a rubber layer clamped between the cover shell and the blocking piece.

[0010] Furthermore, a mounting rod is arranged outside the mounting seat in a direction parallel to the center line of the test cylinder, and the blocking absorption cover is mounted on the mounting rod through a buffer mechanism;

[0011] The buffer mechanism includes a connecting shaft that is vertical and fixed to the end of the mounting rod, an end connecting piece provided at the end of the connecting shaft, and a rotating connecting piece with one end mounted on the other end of the test cylinder and movably sleeved on the connecting shaft. A torsion spring is also sleeved on the connecting shaft. One torsion arm of the torsion spring is fixed to the end connecting piece, and the other torsion arm of the torsion spring is fixed to the rotating connecting piece. The outer shell of the torsion spring damper opens outward around the connecting shaft.

[0012] Further, a limiting rod is vertically provided on the side of the rotating connecting piece facing the test cylinder, and the limiting rod is in contact with the mounting rod.

[0013] Further, two mounting rods are provided with their inner ends close to each other, and two blocking and absorbing covers are respectively mounted on the outer ends of one mounting rod;

[0014] The inner ends of the two mounting rods are respectively vertically hinged to the outer side of the mounting seat through hinge pins. Locking clips are respectively provided on the outer side of the mounting seat corresponding to the two mounting rods. The locking clips are made of elastic material, and their openings correspond to the mounting rods. The mounting rods are clamped and fixed in the openings of the locking clips.

[0015] Further, sliding grooves are respectively horizontally provided on both side walls of the mounting seat, and sliding blocks are respectively provided on the left and right sides of the two test cylinders. The sliding blocks are slidably connected to the sliding grooves.

[0016] Further, several detachable pads are respectively matched and provided at the outer ends of the two test cylinders;

[0017] A number of mounting notches are respectively opened at the outer ends of the two test cylinders and are distributed in a circumferential array;

[0018] The several detachable pads matched with each test cylinder are all of disc structure, and the disc diameter is set corresponding to the inner diameter of the test cylinder. A central hole is opened at the center of each disc, and the diameter of the central hole is different from that of the central holes of other discs. A circumferentially arrayed clamping outer protrusion is provided on the periphery of the disc corresponding to the mounting notch of the test cylinder, and the clamping outer protrusion and the mounting notch are inserted and assembled to realize the detachable assembly of the detachable pad and the test cylinder.

[0019] Compared with the prior art, the bolt pre-tightening force test auxiliary mechanism of the present invention has the following advantages:

[0020] The structure of the present invention is compact, the manufacturing process is simple, the safety performance of the bolt pre-tightening force test process can be greatly improved, and it has a certain universality and can be suitable for the bolt pre-tightening force test sites of different specifications and models. When applied to the bolt pre-tightening force test, the production efficiency will be greatly improved, and obvious economic benefits will be obtained. Description of the Drawings

[0021] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 FIG. is a schematic diagram of the overall structure of an auxiliary mechanism for testing the pre-tightening force of bolts according to an embodiment of the present invention;

[0023] Figure 2 FIG. is a schematic diagram of a protection and blocking mechanism in an embodiment of the present invention;

[0024] Figure 3 FIG. is a schematic diagram of a partial structure of a protection and blocking mechanism in an embodiment of the present invention;

[0025] Figure 4 FIG. is a schematic diagram of a bolt installation mechanism in an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Bolt installation mechanism; 11. Installation base; 111. Slide groove; 12. Test cylinder; 121. Slide block; 122. Installation notch; 13. Removable cushion block; 131. Clamping convex; 14. Base; 2. Hinge seat; 3. Installation rod; 4. Locking clip; 5. Protection and blocking mechanism; 51. Blocking and absorbing cover; 511. Cover housing; 512. Rubber layer; 513. Blocking piece; 53. Buffer mechanism; 531. End connecting piece; 532. Torsion spring; 533 - connecting shaft; 534. Rotating connecting piece; 54. Limiting rod. Detailed implementation manners

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0029] Such as Figure 1 、 Figure 2As shown in the figure, an auxiliary mechanism for testing bolt pre-tightening force includes a bolt installation mechanism 1 and a protection and blocking mechanism 5. The bolt installation mechanism 1 includes a mounting base 11, and a base 14 is provided at the bottom of the mounting base 11 to facilitate fixing the mounting base 11 on the workbench surface. Two test cylinders 12 for testing bolt pre-tightening force are horizontally and oppositely arranged inside the mounting base 11. The two test cylinders 12 are both slidably arranged inside the mounting base 11, enabling the two test cylinders 12 to move closer or separate. A pressure sensor (not shown in the figure) is arranged opposite to one test cylinder 12 with respect to the other test cylinder 12. Two hinge seats 2 are installed on the outer side surface of the mounting base 11. The hinge pins of the hinge seats 2 are arranged vertically. Each of the two hinge seats 2 is provided with a mounting rod 3. The mounting rod 3 is parallel to the center line of the test cylinder 12. The end of the mounting rod 3 protrudes from the end surface of the mounting base 11, that is, the end of the mounting rod 3 is located outside the mounting base 11. The protection and blocking mechanism 5 includes two blocking and absorbing covers 51, which are respectively connected to the ends of the mounting rods 3 through buffer mechanisms 53. The two blocking and absorbing covers 51 are opposite to the outer ends of the two test cylinders 12. The bolt installation mechanism 1 functions to install bolts and perform pre-tightening force tests, while the two blocking and absorbing covers 51 can function to block the flying bolts or nuts. And when the impact of the flying object is too large, it can impact the blocking and absorbing cover 51 to make it rotate against the resistance of the buffer mechanism 53, avoiding damage to the blocking and absorbing cover 51 caused by excessive impact force.

[0030] As Figure 3 shown, the blocking and absorbing cover 51 includes a cover shell 511. The port of the cover shell 511 is opposite to the outer end of the test cylinder 12. A rubber layer 512 is arranged inside the cover shell 511. A blocking piece 513 is clamped at the port of the cover shell 511, and the blocking piece 513 is entirely located inside the cover shell 511, that is, there is a distance between the blocking piece 513 and the port of the cover shell 511. Through the above structural form, during the bolt pre-tightening force test, once the bolt rod breaks, when the flying bolt rod or nut impacts the blocking and absorbing cover 51, it will first penetrate the blocking piece 513 and impact the rubber layer 512. The rubber layer 512 plays a damping role. The broken bolt rod or nut will fall and be retained in the cover shell 511 under the blocking of the blocking piece 513, facilitating the tester to recover the test sample for analysis.

[0031] As Figure 3As shown, the buffer mechanism 53 includes a connecting shaft 533 vertically and fixedly arranged at the end of the mounting rod 3, an end connecting piece 531 arranged at the end of the connecting shaft 533, a rotating connecting piece 534 with one end mounted on the test cylinder 12 and the other end movably sleeved on the connecting shaft 533, and a torsion spring 532 sleeved on the connecting shaft 533 between the rotating connecting piece 534 and the end connecting piece 531. The two torsion arms of the torsion spring 532 are fixedly connected to the end connecting piece 531 and the rotating connecting piece 534 respectively. The torsion spring installation structure is a conventional structure. For example, limit bosses can be provided on the end faces of the end connecting piece 531 and the rotating connecting piece 534 corresponding to the torsion arms of the torsion spring 532 (not shown in the figure). The torsion arms of the torsion spring are fixed by the limit bosses. The torsion spring 532 dampens the rotation of the rotating connecting piece 534, that is, dampens the outward rotation of the blocking and absorbing cover 51 around the connecting shaft 533. This torsion spring installation structure is well-known to those skilled in the art and will not be described in detail here. The torsion spring 532 dampens the opening of the blocking and absorbing cover 51 around the connecting shaft 533 to the outside (the side away from the test cylinder). Through the above buffer mechanism, when the impact of the flying object is too large, it can impact the blocking and absorbing cover 51 to make it rotate against the resistance of the torsion spring 532, avoiding damage to the blocking and absorbing cover 51 caused by excessive impact force.

[0032] The rotating connecting piece 534 is preferably a rectangular rod arm structure. A limiting rod 54 is vertically and fixedly arranged on the inner side of the rotating connecting piece 534, that is, the side facing the test cylinder 12. And when the rotating connecting piece 534 is perpendicular to the mounting rod 3, that is, when the blocking and absorbing cover 51 faces the outer end of the test cylinder, the limiting rod 54 just contacts the mounting rod 3. Through the above structural form, with the setting of the limiting rod 54, the blocking and absorbing cover 51 can be made to face the test cylinder 12. At this time, the blocking and absorbing cover 51 is perpendicular to the bolt being tested, ensuring the blocking effect of the blocking and absorbing cover 51.

[0033] As Figure 1 As shown, on the outer side of the bolt installation mechanism 1, that is, on the outer side of the mounting seat 11, a locking clip 4 is provided near the hinge seat 2. The opening size of the locking clip 4 matches the mounting rod 3, and the locking clip 4 is made of an elastic material. The mounting rod 3 is clamped and fixed in the opening of the locking clip 4. Through the above structural form, during the test, the locking clip 4 can play a constraining role on the mounting rod 3, preventing it from rotating during the test and causing the position of the blocking and absorbing cover 51 to shift and lose its blocking effect.

[0034] As Figure 4As shown in the figure, the bolt installation mechanism 1 includes a mounting base 11. A base 14 is fixedly connected to the bottom of the mounting base 11. On the top surface of the mounting base 11, accommodation chutes are transversely provided corresponding to two test cylinders 12. The two ends of the accommodation chutes penetrate through the mounting base 11. The two test cylinders 12 are arranged in a mirror image in the accommodation chutes and can slide in the accommodation chutes. Removable pads 13 are detachably provided at the outer ends of the two test cylinders 12 and at the ends of the two test cylinders facing away from each other. Through the above structural form, during the test, the bolt passes through the two removable pads 13 and the two test cylinders 12 to complete the connection with the nut, and then tightening the bolt can press the test cylinders 12 to approach each other, achieving the effect of simulating the real working scenario of the bolt.

[0035] In the present invention, several removable pads 13 are respectively provided for the two test cylinders 12. A number of mounting notches 122 arranged in a circumferential array are respectively opened at the outer ends of the two test cylinders 12. Each of the several removable pads 13 matched with each test cylinder 12 is of a disc structure, and the diameter of the disc corresponds to the inner diameter of the test cylinder 12. A central hole for the bolt to pass through is opened at the center of each disc, and the diameter of the central hole is different from that of the central holes of other discs. The removable pad 13 with a matching size can be selected according to the diameter of the bolt to be tested. At the periphery of the disc, clamping protrusions 131 arranged in a circumferential array are provided corresponding to the mounting notches 122 of the test cylinder 12. The clamping protrusions 131 and the mounting notches 122 are inserted and assembled, realizing the detachable assembly of the removable pad 13 and the test cylinder 12. This structure enables the removable pad 13 to be replaced with different sizes at any time, so it can be applied to the test work of bolts of many specifications. The above structural form provides a necessary structural basis for the detachable connection between the test cylinder 12 and the removable pad 13, and enables the tester to select a suitable removable pad 13 to cooperate according to the bolt specifications.

[0036] In the present invention, sliding chutes 111 are respectively transversely opened on both side walls of the mounting base 11, that is, on both side walls of the accommodation chute, as Figure 4 shown, sliding blocks 121 are fixedly provided on both sides of the test cylinder 12, and the sliding blocks 121 are slidably arranged in the sliding chutes 111. Through the above structural form, a necessary structural basis is provided for the sliding connection between the test cylinder 12 and the mounting base 11.

[0037] During the test, the bolt to be tested passes through the two removable pads 13 to complete the connection with the nut, and then tightening the bolt can press the two test cylinders 12 to approach each other, achieving the effect of simulating the real working scenario of the bolt. Moreover, the removable pad 13 can be replaced with different sizes at any time, so it can be applied to the test work of bolts of many specifications. During the test, the two blocking and absorbing covers 51 face the outer ends of the two test cylinders 12 for protection to ensure the test safety.

[0038] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A bolt preload force test auxiliary mechanism, characterized in that: It comprises a bolt installation mechanism (1) and a protective blocking mechanism (5); The bolt mounting mechanism (1) comprises a mounting seat (11) and two test cylinders (12); a receiving slide groove is formed through the top surface of the mounting seat (11) in a transverse direction; the two test cylinders (12) are concentrically and oppositely disposed in the receiving slide groove and are slidably disposed in the receiving slide groove; a pressure sensor is disposed on one of the test cylinders (12) oppositely disposed to the other test cylinder (12); The protective blocking mechanism (5) comprises two blocking absorption covers (51), the two blocking absorption covers (51) are arranged outside the accommodating slide groove and face the two test cylinders (12), and a damping structure is arranged inside the blocking absorption covers (51).

2. A bolt preload force test auxiliary mechanism according to claim 1, characterized in that: The damping structure comprises a port of a cover shell (511) of a blocking absorption cover (51) arranged directly opposite to the test cylinder (12), a blocking piece (513) clamped to the port, and a rubber layer (512) clamped between the cover shell (511) and the blocking piece (513).

3. The bolt preload force test auxiliary mechanism according to claim 1, characterized in that: A mounting rod (3) is arranged outside the mounting seat (11) in a direction parallel to the center line of the test cylinder (12), and the blocking absorption cover (51) is mounted on the mounting rod (3) via a buffer mechanism (53); The buffer mechanism (53) comprises a connecting shaft (533) which is vertical and fixed to the end of the mounting rod (3), an end connecting piece (531) arranged at the end of the connecting shaft (533), and a rotating connecting piece (534) having one end mounted on the test cylinder (12) and the other end movably mounted on the connecting shaft (533). The connecting shaft (533) is also mounted with a torsion spring (532), one torsion arm of the torsion spring (532) is fixed to the end connecting piece (531), and the other torsion arm of the torsion spring (532) is fixed to the rotating connecting piece (534). The torsion spring (532) damping cover housing (511) opens outward around the connecting shaft (533).

4. A bolt preload force test auxiliary mechanism according to claim 3, characterized in that: A limiting rod (54) is vertically arranged on the side of the rotating connecting piece (534) facing the testing cylinder (12), and the limiting rod (54) is in contact with the mounting rod (3).

5. The bolt preload force test auxiliary mechanism according to claim 3, characterized in that: Two mounting rods (3) are provided with their inner ends close to each other, and two blocking absorption covers (51) are respectively mounted on the outer end of one mounting rod (3); The inner ends of the two mounting rods (3) are respectively connected to the outer side of the mounting seat (11) through a hinge pin vertical hinge seat (2), and the outer side of the mounting seat (11) is provided with a locking clip (4) corresponding to the two mounting rods (3), respectively. The locking clip (4) is made of elastic material, and its opening corresponds to the mounting rod (3). The mounting rod (3) is clamped and fixed in the opening of the locking clip (4).

6. A bolt preload force test auxiliary mechanism according to claim 1, characterized in that: Slide grooves (111) are respectively arranged on the two side walls of the mounting seat (11) in the transverse direction, and slide blocks (121) are respectively arranged on the left and right sides of the two test cylinders (12), and the slide blocks (121) are slidably connected to the slide grooves (111).

7. The bolt preload force test auxiliary mechanism according to claim 1, characterized in that: The outer ends of the two test tubes (12) are respectively matched with a plurality of detachable pads (13); The outer ends of the two test tubes (12) are respectively provided with a plurality of mounting notches (122) distributed in a circumferential array; The plurality of detachable cushion blocks (13) matched with each test cylinder (12) are all disc structures, and the diameter of the disc is set corresponding to the inner diameter of the test cylinder (12). A center hole is provided at the center of each disc, and the diameter of the center hole is different from the diameters of the center holes of other discs. The periphery of the disc is provided with snap-fitting protrusions (131) distributed in a circumferential array corresponding to the mounting notches (122) of the test cylinder (12). The snap-fitting protrusions (131) and the mounting notches (122) are plug-in assembled to realize the detachable assembly of the detachable cushion block (13) and the test cylinder (12).

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