Fastener strength detection device

Abstract

The invention relates to the technical field of fastener detection, in particular to a fastener strength detection device which comprises a base, a semicircular seat is mounted at the end, away from a positioning piece, of the base, a supporting seat is mounted on the face, away from the base, of the semicircular seat, and a horizontally-arranged hydraulic cylinder is mounted on the vertical portion of the supporting seat. A guide sleeve is installed on the face, away from the supporting base, of the semicircular base through a support, a guide column used for extruding a pressure bearing cylinder in the anchor cable dynamometer is inserted in the guide sleeve, and a U-shaped frame is installed on the face, away from the anchor cable dynamometer, of the guide column. The end, away from the guide column, of the U-shaped frame is provided with a jacking plate used for jacking the fastener through an adjusting piece, and the upper surface of the jacking plate is provided with a detachable limiting piece used for limiting the U-shaped frame to move in the direction away from the semicircular base. The pressure gauge has the beneficial effect that sufficient recording time is provided for personnel to record the maximum index indicated by the pressure gauge head.

Description

Technical Field

[0001] The invention relates to a fastener strength detection device, belonging to the technical field of fastener detection. Background Art

[0002] Fastener strength testing is an important step to ensure that fasteners (such as screws, bolts, etc.) can withstand the expected load during use. Through strength testing, it is possible to verify whether the material properties, manufacturing process and design of the fasteners meet the standard requirements. Evaluating the deformation resistance of fasteners indirectly reflects their strength. Using a hydraulic cylinder to squeeze the fasteners with restricted position, and then using a pressure gauge to measure the maximum extrusion force on the fasteners when they are deformed is one of the common ways to measure the deformation resistance of fasteners. When the fastener is deformed and about to break, one side of the pressure gauge will lose support and its pointer will easily return to its position quickly. At this time, the time for personnel to record the maximum index of the pressure gauge is short, and it is easy to fail to accurately obtain the pressure gauge index. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a fastener strength detection device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: a fastener strength detection device, comprising a base, a positioning piece for limiting the position of the fastener is installed on one side of the upper surface of the base, a semicircular seat is installed on the end of the base away from the positioning piece, an anchor dynamometer is arranged in the semicircular seat, a support seat is installed on the side of the semicircular seat away from the base, a horizontally arranged hydraulic cylinder is installed on the vertical part of the support seat, a detachable pressure plate for squeezing the dynamometer steel cylinder in the anchor dynamometer is installed on the movable end of the hydraulic cylinder, a guide sleeve is installed on the side of the semicircular seat away from the support seat through a bracket, the guide sleeve is arranged concentrically with the semicircular seat, a guide column for squeezing the pressure cylinder in the anchor dynamometer is inserted in the guide sleeve, a U-shaped frame is installed on the side of the guide column away from the anchor dynamometer, a top pressure plate for pressing the fastener is installed on the end of the U-shaped frame away from the guide column through an adjusting piece, and a detachable limiting piece for limiting the movement of the U-shaped frame in the direction away from the semicircular seat is installed on the upper surface of the top pressure plate.

[0005] Specifically, the positioning member includes a boss, a boss is installed on one side of the upper surface of the base, the upper surface of the boss is recessed downward to form a rectangular groove, a plug-in block is inserted in the rectangular groove, the cross-section of the plug-in block is rectangular, and a threaded hole for installing a fastener is opened on the upper surface of the plug-in block.

[0006] Specifically, the adjusting member includes a strip plate, an upper strip opening is provided on the side of the upper surface of the U-shaped frame away from the guide column, and a lower strip opening aligned with the upper strip opening is provided on the side of the lower surface of the U-shaped frame away from the guide column, a strip plate is inserted in the channel formed by the upper strip opening and the lower strip opening, a sleeve frame is provided on the upper side of the upper strip opening, the sleeve frame is connected and fixed to the U-shaped frame, the strip plate passes through the sleeve frame, a screw hole is provided on one side of the sleeve frame, a positioning screw for limiting the position of the strip plate is threadedly connected to the screw hole, one end of the top pressure plate is connected and fixed to the strip plate, and a V-shaped groove is processed on one side of the top pressure plate away from the strip plate.

[0007] Specifically, a groove is provided on one side of the strip plate facing the screw hole, the groove is arranged vertically, a rubber pad is glued in the groove, and one end of the positioning screw is in contact with the rubber pad.

[0008] Specifically, the anchor dynamometer comprises a dynamometer steel cylinder, a pressure-bearing cylinder is inserted in the dynamometer steel cylinder, and a pressure gauge head is installed at the upper position of the outer surface of the dynamometer steel cylinder through a metal pipe.

[0009] Specifically, two symmetrically arranged vertical plates are installed on the upper surface of the semicircular seat, and removable horizontal plates are installed on the upper ends of the two vertical plates by screws. A clamping frame is installed on the end of the two horizontal plates away from the vertical plates. A hexahedron is installed on the end of the metal tube close to the dynamometer steel cylinder, and the hexahedron is arranged in the space formed by the two clamping frames.

[0010] Specifically, the limit member includes a guide seat, a detachable guide seat is installed on the upper surface of the top pressure plate, the guide seat is an L-shaped structure, a rectangular hole is opened on one side of the horizontal part of the guide seat, a rectangular rod is inserted in the rectangular hole, a first piston is installed on the end of the rectangular rod outside the rectangular hole, a thick cylinder is sleeved on the first piston, the thick cylinder is connected and fixed to the base through the L-shaped rod, a bent rod is installed on the lower surface of the rectangular rod, the bent rod is an L-shaped structure, the end of the horizontal part of the bent rod is in contact with a fastener, a one-way valve is installed in the middle of one side of the thick cylinder away from the guide seat, the one-way valve is conducted in the direction away from the thick cylinder, and the U-shaped frame A thin cylinder is provided on the side close to the guide column, and the side of the thin cylinder facing the vertical part of the U-shaped frame is open. Stop valves are installed on the closed ends of the thick cylinder and the thin cylinder. Two symmetrically arranged connecting seats are installed on the outer surface of the thin cylinder, and the connecting seats are fixedly connected to the base. A second piston is slidably installed in the thin cylinder, and a push rod is installed at the middle position of one side of the second piston. The end of the push rod away from the second piston extends to the outside of the thin cylinder, and there is a gap between the end of the push rod on the outside of the thin cylinder and the vertical part of the U-shaped frame in the initial state. A high-pressure hose is installed on the closed end of the thin cylinder, and the end of the high-pressure hose away from the thin cylinder is connected to the one-way valve.

[0011] Specifically, a plug-in sleeve is connected and fixed to the middle position of one side of the pressure plate facing the hydraulic cylinder, and the movable end of the hydraulic cylinder is inserted into the plug-in sleeve.

[0012] Beneficial effects of the present invention:

[0013] 1. Insert the plug-in block into the rectangular groove on the boss to realize the assembly of the plug-in block and the boss, screw the lower end of the fastener into the threaded hole to complete the restriction of the position of the fastener. By replacing the plug-in block with threaded holes of different inner diameters, it is convenient to limit the position of fasteners of different types and expand the scope of use.

[0014] 2. Adjust the position of the strip plate along the channel formed by the upper strip opening and the lower strip opening. At this time, the position of the top pressure plate also changes. Process a V-shaped groove on the top pressure plate so that one end of the fastener is in the V-shaped groove. On the one hand, the fastener and the guide sleeve cooperate with each other to keep the strip plate in a vertical state. When the position of the strip plate is adjusted, the height of the top pressure plate also changes, so that the top pressure plate can be moved to different parts of the fastener, which is convenient for anti-deformation performance testing of different parts of the fastener.

[0015] 3. Install the guide seat on the top pressure plate, and then adjust the position of the strip plate. The height of the rectangular rod inserted in the rectangular hole also changes. At this time, the height of the thick tube also changes. When the position of the top pressure plate meets the needs, use L-shaped rods of different sizes to connect the base and the thick tubes at different heights to complete the restriction of the position of the thick tube, so that the relative position of the horizontal part of the bent rod and the fastener can be adjusted as needed.

[0016] 4. Place the dynamometer steel cylinder in the anchor dynamometer in the semicircular seat. When controlling the extension of the hydraulic cylinder, the hydraulic cylinder drives the pressure plate to press the dynamometer steel cylinder, so that the top pressure plate contacts the fastener. Under the restriction of the fastener, the guide column contacts the pressure cylinder and continues to extend the hydraulic cylinder. At this time, the extrusion force generated by the hydraulic cylinder will act on the fastener, providing power for the deformation of the fastener. At this time, the anchor dynamometer displays the extrusion force generated by the hydraulic cylinder, which is convenient for recording the maximum extrusion force on the fastener during deformation and providing data for fastener strength detection.

[0017] 5. When the fastener is deformed and separated from the V-groove during the extrusion process, the U-shaped frame will flip over due to loss of balance. At this time, the guide column rotates in the guide sleeve. On the one hand, the guide column and the guide sleeve cooperate with each other to limit the position of the U-shaped frame. On the other hand, the guide column rotates in the guide sleeve, thereby unloading the force when the U-shaped frame flips over.

[0018] 6. When the fastener is deformed under extrusion, the deformed fastener will squeeze the bent rod. After being squeezed, the bent rod drives the rectangular rod to move along the rectangular hole. The rectangular rod and the rectangular hole cooperate with each other to prevent the bent rod from rotating. The rectangular rod drives the first piston to move in the thick cylinder. At this time, the air in the thick cylinder flows into the thin cylinder through the high-pressure hose, so that the small displacement of the fastener bending deformation is converted into air from the thick cylinder with a large inner diameter to the thin cylinder with a small inner diameter, so that the moving distance of the second piston is increased, which plays a role in amplifying the displacement of the fastener. Therefore, the second piston drives the push rod to move under the extrusion of the air, so that the push rod is pressed on the side of the vertical part of the U-shaped frame. A one-way valve is installed between the thick cylinders, so the air in the thin cylinder does not flow back into the thick cylinder, so that the structure formed by the push rod, the thin cylinder, the connecting seat and other components limits the position of the U-frame, avoiding the return of the pointer in the pressure gauge head due to the loss of support on one side of the anchor dynamometer when the fastener is deformed, providing sufficient recording time for personnel to record the maximum index indicated by the pressure gauge head, preventing data errors. After opening the stop valve, it is easy for air to enter the thin cylinder and the thick cylinder, which is convenient for resetting the first piston and the second piston. After the stop valve on the thin cylinder is opened, it is convenient to adjust the initial gap size between the push rod and the vertical part of the U-frame as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 It is a structural schematic diagram of a fastener strength detection device of the present invention;

[0021] Figure 2 A three-dimensional diagram of a fastener strength detection device according to the present invention from another viewing angle;

[0022] Figure 3 It is a schematic diagram of the assembly of an anchor dynamometer, a semicircular seat, a boss, a guide sleeve and a base in a fastener strength detection device of the present invention;

[0023] Figure 4 It is a schematic diagram of the assembly of a guide column and a U-shaped frame in a fastener strength detection device of the present invention;

[0024] Figure 5 It is a schematic diagram of the assembly of a guide seat, a top pressure plate and a strip plate in a fastener strength detection device of the present invention;

[0025] Figure 6 It is a schematic diagram of the assembly of a second piston, a push rod and a thin cylinder in a fastener strength detection device of the present invention;

[0026] Figure 7 It is a schematic diagram of assembling a clamp frame and a horizontal plate in a fastener strength detection device of the present invention;

[0027] In the figure: 1, base, 2, boss, 3, plug-in block, 4, fastener, 5, L-shaped rod, 6, stop valve, 7, high-pressure hose, 8, one-way valve, 9, thick cylinder, 10, guide seat, 11, top pressure plate, 12, strip plate, 13, rubber pad, 14, pressure gauge head, 15, U-shaped frame, 16, horizontal plate, 17, hydraulic cylinder, 18, support seat, 19, vertical plate, 20, semicircular seat, 21, dynamometer steel cylinder, 22, guide Sleeve, 23, push rod, 24, connecting seat, 25, thin cylinder, 26, positioning screw, 27, sleeve frame, 28, pressure plate, 29, plug-in sleeve, 30, first piston, 31, rectangular rod, 32, bent rod, 33, rectangular groove, 34, pressure cylinder, 35, screw hole, 36, upper strip mouth, 37, lower strip mouth, 38, guide column, 39, rectangular hole, 40, V-shaped groove, 41, groove, 42, second piston, 43, card frame. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0029] See also Figure 1-Figure 3 The present invention provides a technical solution: a fastener strength detection device, comprising a base 1, a boss 2 is installed on one side of the upper surface of the base 1, the upper surface of the boss 2 is recessed downward to form a rectangular groove 33, a plug-in block 3 is inserted in the rectangular groove 33, the plug-in block 3 has a rectangular cross-section, and a threaded hole for installing a fastener 4 is opened on the upper surface of the plug-in block 3. The plug-in block 3 is inserted into the rectangular groove 33 on the boss 2 to realize the assembly of the plug-in block 3 and the boss 2, and the lower end of the fastener 4 is screwed into the threaded hole to complete the position restriction of the fastener 4. By replacing the plug-in block 3 with threaded holes of different inner diameters, it is convenient to limit the fasteners 4 of different models and expand the scope of use.

[0030] See also Figure 1-Figure 3 A semicircular seat 20 is installed at one end of the base 1 away from the boss 2, and an anchor dynamometer is arranged in the semicircular seat 20. The anchor dynamometer includes a dynamometer steel cylinder 21, and a pressure-bearing cylinder 34 is inserted in the dynamometer steel cylinder 21. A pressure gauge head 14 is installed at the upper position of the outer surface of the dynamometer steel cylinder 21 through a metal tube. A support seat 18 is installed on the side of the semicircular seat 20 away from the base 1. A horizontally arranged hydraulic cylinder 17 is installed on the vertical part of the support seat 18. A detachable pressure plate 28 for squeezing the dynamometer steel cylinder 21 in the anchor dynamometer is installed at the movable end of the hydraulic cylinder 17, wherein a plug-in sleeve 29 is connected and fixed to the middle position of the side of the pressure plate 28 facing the hydraulic cylinder 17, so that the movable end of the hydraulic cylinder 17 is inserted in the plug-in sleeve 29 to realize the plug-in connection between the hydraulic cylinder 17 and the pressure plate 28.

[0031] See also Figure 1-Figure 4A guide sleeve 22 is installed on the side of the semicircular seat 20 away from the support seat 18 through a bracket. The guide sleeve 22 is arranged concentrically with the semicircular seat 20. A guide column 38 for squeezing the pressure cylinder 34 in the anchor dynamometer is inserted in the guide sleeve 22. A U-shaped frame 15 is installed on the side of the guide column 38 away from the anchor dynamometer. The dynamometer steel cylinder 21 in the anchor dynamometer is placed in the semicircular seat 20. When the hydraulic cylinder 17 is controlled to extend, the hydraulic cylinder 17 drives the pressure plate 28 to press the dynamometer steel cylinder 21, so that the top pressure plate 11 contacts the fastener 4. Under the restriction of the fastener 4, the guide column 38 contacts the pressure cylinder 34, and the hydraulic cylinder 17 continues to extend. At this time, the hydraulic cylinder 17 produces The generated extrusion force will act on the fastener 4, providing power for the deformation of the fastener 4. At this time, the anchor dynamometer displays the extrusion force generated by the hydraulic cylinder 17, which is convenient for recording the maximum extrusion force on the fastener 4 during deformation, and providing data for the strength detection of the fastener 4. When the fastener 4 is deformed and disengaged from the V-groove 40 during the extrusion process, the U-shaped frame 15 will flip over due to loss of balance. At this time, the guide column 38 rotates in the guide sleeve 22. On the one hand, the guide column 38 cooperates with the guide sleeve 22 to limit the position of the U-shaped frame 15. On the other hand, the guide column 38 rotates in the guide sleeve 22, thereby playing a role in unloading force when the U-shaped frame 15 flips over.

[0032] See also Figure 1-Figure 5 An upper strip opening 36 is provided on the side of the upper surface of the U-shaped frame 15 away from the guide column 38, and a lower strip opening 37 aligned with the upper strip opening 36 is provided on the side of the lower surface of the U-shaped frame 15 away from the guide column 38. A strip plate 12 is inserted into the channel formed by the upper strip opening 36 and the lower strip opening 37. A sleeve frame 27 is provided on the upper side of the upper strip opening 36. The sleeve frame 27 is connected and fixed to the U-shaped frame 15. The strip plate 12 passes through the sleeve frame 27. A screw hole 35 is provided on one side of the sleeve frame 27. A positioning screw 26 for limiting the position of the strip plate 12 is threadedly connected to the screw hole 35. A groove 41 is provided on the side of the strip plate 12 facing the screw hole 35. The groove 41 is arranged vertically. A rubber pad 13 is glued in the groove 41. When the positioning screw 26 is tightened, one end of the positioning screw 26 is in contact with the rubber pad 13 is in contact with each other, thereby improving the stability of the positioning screw 26 in limiting the position of the strip plate 12. One end of the top pressure plate 11 is connected and fixed to the strip plate 12. A V-shaped groove 40 is processed on the side of the top pressure plate 11 away from the strip plate 12. The position of the strip plate 12 is adjusted along the channel formed by the upper strip opening 36 and the lower strip opening 37. At this time, the position of the top pressure plate 11 is also changed. The V-shaped groove 40 is processed on the top pressure plate 11 so that one end of the fastener 4 is in the V-shaped groove 40. On the one hand, the fastener 4 cooperates with the guide sleeve 22 to make the strip plate 12 in a vertical state. When the position of the strip plate 12 is adjusted, the height of the top pressure plate 11 is also changed, so that the top pressure plate 11 can be moved to different parts of the fastener 4, which is convenient for testing the anti-deformation performance of different parts of the fastener 4.

[0033] See also Figure 1 , Figure 2 , Figure 3 and Figure 7 Two symmetrically arranged vertical plates 19 are installed on the upper surface of the semicircular seat 20, and detachable horizontal plates 16 are installed on the upper ends of the two vertical plates 19 by screws. A clamping frame 43 is installed on the end of the two horizontal plates 16 away from the vertical plates 19. A hexahedron is installed on the end of the metal tube close to the dynamometer steel cylinder 21. The hexahedron is set in the space formed by the two clamping frames 43. When not in use, the two clamping frames 43 are both sleeved on the hexahedron, and then one end of the horizontal plate 16 is connected to the vertical plate 19. At this time, the vertical plate 19, the horizontal plate 16, the semicircular seat 20 and other components realize the support and limitation of the anchor dynamometer.

[0034] See also Figure 1 , Figure 2 and Figure 5 A detachable guide seat 10 is installed on the upper surface of the top pressure plate 11. The guide seat 10 is an L-shaped structure. A rectangular hole 39 is opened on one side of the horizontal part of the guide seat 10. A rectangular rod 31 is inserted in the rectangular hole 39. A bent rod 32 is installed on the lower surface of the rectangular rod 31. The bent rod 32 is an L-shaped structure. The horizontal end of the bent rod 32 contacts the fastener 4. The rectangular rod 31 and the rectangular hole 39 cooperate with each other to prevent the bent rod 32 from rotating.

[0035] See also Figure 1-Figure 6A first piston 30 is installed at one end of the rectangular rod 31 outside the rectangular hole 39, a thick cylinder 9 is sleeved on the first piston 30, and the thick cylinder 9 is connected and fixed to the base 1 through an L-shaped rod 5. A one-way valve 8 is installed in the middle of the side of the thick cylinder 9 away from the guide seat 10, and the one-way valve 8 is conducted in the direction away from the thick cylinder 9. A thin cylinder 25 is provided on the side of the U-shaped frame 15 close to the guide column 38, and the side of the thin cylinder 25 facing the vertical part of the U-shaped frame 15 is open. The closed ends of the thick cylinder 9 and the thin cylinder 25 are both installed with stop valves 6. Two symmetrically arranged connecting seats 24 are installed on the outer surface of the thin cylinder 25, and the connecting seat 24 is connected to the base 1 The second piston 42 is connected and fixed, and a second piston 42 is slidably installed in the thin cylinder 25. A push rod 23 is installed in the middle of one side of the second piston 42. The end of the push rod 23 away from the second piston 42 extends to the outside of the thin cylinder 25. There is a gap between the end of the push rod 23 on the outside of the thin cylinder 25 and the vertical part of the U-shaped frame 15 in the initial state. A high-pressure hose 7 is installed at the closed end of the thin cylinder 25. The end of the high-pressure hose 7 away from the thin cylinder 25 is connected to the one-way valve 8. When the fastener 4 is deformed under extrusion, the deformed fastener 4 will squeeze the bent rod 32. After being squeezed, the bent rod 32 drives the rectangular rod 31 to move along the rectangular hole 39, and the rectangular rod 31 The first piston 30 is driven to move in the thick cylinder 9. At this time, the air in the thick cylinder 9 flows into the thin cylinder 25 through the high-pressure hose 7, so that the small displacement of the fastener 4 is converted into air and transferred from the thick cylinder 9 with a large inner diameter to the thin cylinder 25 with a small inner diameter, so that the moving distance of the second piston 42 is increased, which plays a role in amplifying the displacement of the fastener 4. Therefore, the second piston 42 drives the push rod 23 to move under the pressure of air, so that the push rod 23 is pressed against the side of the vertical part of the U-shaped frame 15. Because a one-way valve 8 is installed between the high-pressure hose 7 and the thick cylinder 9, the air in the thin cylinder 25 does not flow back to the thick cylinder 9, so that the push rod 23 and the thin cylinder 25. The structure formed by the connecting seat 24 and other components limits the position of the U-shaped frame 15 to prevent the pointer in the pressure gauge head 14 from returning to its original position due to the loss of support on one side of the anchor dynamometer when the fastener 4 is deformed. Sufficient recording time is provided for personnel to record the maximum index indicated by the pressure gauge head 14 to prevent data errors. After opening the stop valve 6, it is convenient for air to enter the thin cylinder 25 and the thick cylinder 9, which is convenient for resetting the first piston 30 and the second piston 42. After the stop valve 6 on the thin cylinder 25 is opened, it is convenient to adjust the initial gap size between the push rod 23 and the vertical part of the U-shaped frame 15 as needed.

[0036] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A fastener strength detection device, comprising a base (1), characterized in that: A positioning piece for limiting the position of the fastener (4) is installed on one side of the upper surface of the base (1); a semicircular seat (20) is installed at one end of the base (1) away from the positioning piece, and an anchor dynamometer is arranged in the semicircular seat (20); a support seat (18) is installed on the side of the semicircular seat (20) away from the base (1); a horizontally arranged hydraulic cylinder (17) is installed on the vertical part of the support seat (18); a detachable pressure plate (28) for squeezing the dynamometer steel cylinder (21) in the anchor dynamometer is installed on the movable end of the hydraulic cylinder (17); and a semicircular seat (20) is installed on the side away from the support seat (18). A guide sleeve (22) is installed through the bracket, and the guide sleeve (22) is arranged concentrically with the semicircular seat (20). A guide column (38) for squeezing the pressure tube (34) in the anchor dynamometer is inserted in the guide sleeve (22). A U-shaped frame (15) is installed on the side of the guide column (38) away from the anchor dynamometer. A pressing plate (11) for pressing the fastener (4) is installed on the end of the U-shaped frame (15) away from the guide column (38) through an adjusting member. A detachable limiting member for limiting the movement of the U-shaped frame (15) in a direction away from the semicircular seat (20) is installed on the upper surface of the pressing plate (11).

2. A fastener strength detection device according to claim 1, characterized in that: The positioning member comprises a boss (2), the boss (2) being mounted on one side of the upper surface of the base (1), the upper surface of the boss (2) being recessed downward to form a rectangular groove (33), a plug-in block (3) being inserted into the rectangular groove (33), the plug-in block (3) having a rectangular cross section, and a threaded hole for mounting a fastener (4) being provided on the upper surface of the plug-in block (3).

3. A fastener strength detection device according to claim 1, characterized in that: The adjusting member comprises a strip plate (12); an upper strip opening (36) is provided on the side of the upper surface of the U-shaped frame (15) away from the guide column (38); a lower strip opening (37) aligned with the upper strip opening (36) is provided on the side of the lower surface of the U-shaped frame (15) away from the guide column (38); the strip plate (12) is inserted into the channel formed by the upper strip opening (36) and the lower strip opening (37); a sleeve frame (27) is provided on the upper side of the upper strip opening (36); ), the sleeve (27) is connected and fixed to the U-shaped frame (15), the strip plate (12) passes through the sleeve (27), a screw hole (35) is opened on one side of the sleeve (27), and a positioning screw (26) for limiting the position of the strip plate (12) is connected to the inner thread of the screw hole (35), one end of the top pressure plate (11) is connected and fixed to the strip plate (12), and a V-shaped groove (40) is processed on the side of the top pressure plate (11) away from the strip plate (12).

4. A fastener strength detection device according to claim 3, characterized in that: A groove (41) is provided on one side of the strip plate (12) facing the screw hole (35), and the groove (41) is arranged vertically. A rubber pad (13) is glued into the groove (41), and one end of the positioning screw (26) is in contact with the rubber pad (13).

5. A fastener strength detection device according to claim 1, characterized in that: The anchor dynamometer comprises a dynamometer steel cylinder (21), a pressure-bearing cylinder (34) is inserted in the dynamometer steel cylinder (21), and a pressure gauge head (14) is installed at the upper position of the outer surface of the dynamometer steel cylinder (21) through a metal pipe.

6. A fastener strength detection device according to claim 5, characterized in that: Two symmetrically arranged vertical plates (19) are installed on the upper surface of the semicircular seat (20), and a detachable horizontal plate (16) is installed on the upper ends of the two vertical plates (19) by means of screws. A clamping frame (43) is installed on one end of the two horizontal plates (16) away from the vertical plate (19). A hexahedron is installed on one end of the metal tube close to the dynamometer steel cylinder (21), and the hexahedron is arranged in a space formed by the two clamping frames (43).

7. A fastener strength detection device according to claim 1, characterized in that: The limiting member comprises a guide seat (10), a detachable guide seat (10) is installed on the upper surface of the top pressure plate (11), the guide seat (10) is an L-shaped structure, a rectangular hole (39) is opened on one side of the horizontal part of the guide seat (10), a rectangular rod (31) is inserted in the rectangular hole (39), a first piston (30) is installed on one end of the rectangular rod (31) outside the rectangular hole (39), a thick cylinder (9) is sleeved on the first piston (30), the thick cylinder (9) is connected and fixed to the base (1) through an L-shaped rod (5), a bent rod (32) is installed on the lower surface of the rectangular rod (31), the bent rod (32) is an L-shaped structure, the horizontal end of the bent rod (32) is in contact with the fastener (4), a one-way valve (8) is installed at the middle position of one side of the thick cylinder (9) away from the guide seat (10), and the one-way valve (8) is conductive in the direction away from the thick cylinder (9); A thin cylinder (25) is provided on one side of the U-shaped frame (15) near the guide column (38), and a side of the thin cylinder (25) facing the vertical portion of the U-shaped frame (15) is open. The closed ends of the thick cylinder (9) and the thin cylinder (25) are both provided with stop valves (6). Two symmetrically arranged connecting seats (24) are provided on the outer surface of the thin cylinder (25), and the connecting seats (24) are connected and fixed to the base (1). A second piston (42) is slidably installed in the thin cylinder (25). ), a push rod (23) is installed at the middle position of one side of the second piston (42), and the end of the push rod (23) away from the second piston (42) extends to the outside of the capillary (25), and there is a gap between the end of the push rod (23) outside the capillary (25) and the vertical part of the U-shaped frame (15) in the initial state, and a high-pressure hose (7) is installed at the closed end of the capillary (25), and the end of the high-pressure hose (7) away from the capillary (25) is connected to the one-way valve (8).

8. A fastener strength detection device according to claim 1, characterized in that: A plug-in sleeve (29) is connected and fixed to the middle of one side of the pressure plate (28) facing the hydraulic cylinder (17), and the movable end of the hydraulic cylinder (17) is inserted into the plug-in sleeve (29).

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