Detection device for bolt torque

Abstract

A detection frame is fixed on a workbench and is provided with a positioning plate and a pressing plate which are arranged at an interval, the positioning plate is provided with a positioning hole, and one side, deviating from the pressing plate, of the positioning hole is provided with an inner circumferential surface which is the same as the outer circumferential surface of a bolt head of a to-be-detected bolt in shape; a screw hole coaxial with the positioning hole is formed in the pressing plate; an output shaft of the driving motor is provided with a joint rod through a torquemeter, one end of the driving rod is provided with a driving hole, and the other end is connected with the joint rod; the driving motor is a servo motor; a detection nut is screwed on a screw rod of the to-be-detected bolt after sequentially penetrating through the positioning hole and the screw rod hole, the detection nut is contained in the driving hole, and the driving hole is provided with an inner circumferential face which is the same as the outer circumferential face of the detection nut in shape. The to-be-detected bolt is not required to be limited by parts such as a limiting bolt, the servo motor can perform accurate control, the detection nut is not required to be screwed manually, and the detection convenience and the detection efficiency are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of detection devices for bolt torque. BACKGROUND

[0002] Bolt is used as the common connecting component of engineering structure, is widely used in high-pressure equipment, bridge, high-rise building and underground structure etc. engineering, in order to guarantee the safety of engineering, the torque of bolt needs to be detected.

[0003] Patent No. 2019212323098 discloses a bolt torque measuring instrument, which comprises a support, a sliding groove is arranged on the support, the opening on the side of the sliding groove is located on the side wall of one end of the support, a sliding block is slidably connected in the sliding groove, a "convex" shaped clamping groove is formed at one end of the sliding block, the opening on the side of the sliding groove is provided with a baffle, an installation groove is arranged in the height direction of the baffle, the opening of the installation groove is located on the top surface of the baffle, the installation groove comprises a limiting groove at the upper end of the installation groove and a positioning groove at the bottom end of the installation groove, the positioning groove penetrates through the thickness direction of the baffle, the bottom surface of the positioning groove and the bottom surface of the clamping groove correspond and are located on the same horizontal plane, the installation groove comprises a cylindrical limiting groove, one end of the limiting groove is located on the top surface of the baffle, the other end of the limiting groove communicates with the positioning groove, and a limiting bolt is screwed in the limiting groove. In this patent, a limiting bolt is used to keep the measured screw rod in the positioning groove. During each detection process, the limiting bolt needs to be unscrewed from the limiting groove first, and then the measured bolt is installed in the positioning groove. When the limiting bolt is screwed in the limiting groove, the installation of the measured bolt is inconvenient. In addition, in this application, the nut on the measured bolt needs to be screwed manually, which is inconvenient. SUMMARY

[0004] To solve the problems of inconvenient installation of the measured bolt and the need for manual screwing of the nut on the measured bolt in the prior art, the present application provides a detection device for bolt torque, which comprises a workbench, a detection frame is fixedly installed on the workbench, the detection frame comprises a positioning plate and a pressing plate spaced apart along a first axis direction, a positioning hole is formed in the positioning plate, the side of the positioning hole away from the pressing plate is formed into a limiting hole, and the limiting hole has an inner peripheral surface identical in shape to the outer peripheral surface of the bolt head of the measured bolt; a screw rod hole is formed in the pressing plate, and the positioning hole and the screw rod hole are coaxially arranged along the first axis direction;

[0005] A driving motor is slidably clamped on the workbench, the driving motor can reciprocate along the first axis direction, the driving motor is located on the side of the pressing plate away from the positioning plate, a joint rod is connected to the output shaft of the driving motor through a torque instrument, one end of the driving rod has a driving hole, and the other end of the driving rod is detachably connected to the joint rod; the driving motor is a servo motor; a display is connected to the data interface of the torque instrument;

[0006] The screw rod of the bolt to be tested can pass through the positioning hole and the screw rod hole in sequence, the detection nut is screwed on the screw rod of the bolt to be tested, and the detection nut is located on the side of the pressing plate away from the positioning plate, the detection nut can be accommodated in the driving hole, and the driving hole has an inner peripheral surface which is the same as the shape of the outer peripheral surface of the detection nut. Specifically, the detection nut has a hexagonal outer peripheral surface.

[0007] When the embodiment is in operation, first, the driving motor is moved away from the detection frame, so that the distance between the driving rod and the pressing plate can accommodate the detection nut, then the screw rod of the bolt to be tested passes through the positioning hole and the screw rod hole in sequence, the detection nut is screwed on the end of the screw rod extending from the pressing plate, the head of the bolt to be tested is accommodated in the limiting hole, so as to avoid rotating the bolt to be tested when screwing the detection nut, then the sliding plate is moved towards the detection frame, the driving hole of the driving rod is sleeved on the detection nut, the driving motor is started, the detection nut is rotated, the detection nut moves towards the detection frame until the detection nut presses on the pressing plate, the detection nut is continuously rotated until the display 221 displays the maximum torque value.

[0008] By using the application, when the bolt to be tested is installed, only the screw rod of the bolt to be tested needs to pass through the positioning hole and the screw rod hole, and then the detection nut is screwed on the screw rod of the bolt to be tested, without using a limiting bolt or the like to limit the bolt to be tested, so as to avoid the bolt to be tested from being pulled out of the positioning hole. The driving motor in the application is a servo motor, which can be accurately controlled, without using a manual method to screw the detection nut, so as to improve the convenience of detection and improve the detection efficiency. Moreover, when necessary, a torque meter can be directly integrated on the driving motor, so as to simplify the structure of the equipment.

[0009] Further, two sliding grooves extending along the first axis direction and parallel to each other are formed on the workbench, a sliding rail slidingly clamped in the sliding grooves is fixedly arranged on the lower surface of the sliding plate, and the driving motor is fixedly installed on the sliding plate; the cross section of the sliding groove is T-shaped, the cross section of the sliding rail is T-shaped and adapted to the sliding groove, the locking screw is screwed on the sliding plate and downwardly penetrates the sliding plate. Or two sliding rails extending along the first axis direction and parallel to each other are fixedly installed on the workbench, a sliding groove slidingly clamped on the sliding rails is formed on the lower surface of the sliding plate, and the driving motor is fixedly installed on the sliding plate; the cross section of the sliding groove is T-shaped, the cross section of the sliding rail is T-shaped and adapted to the sliding groove, and the locking screw is screwed on the sliding plate and downwardly penetrates the sliding plate. In specific embodiments, different sliding plate installation schemes can be selected according to different requirements. By using the sliding plate, the driving motor can be flexibly moved along the first axis direction, and by using the clamping of the sliding groove and the sliding rail, the driving motor is prevented from shaking when driving the detection nut to rotate, thereby avoiding the adverse effect on the screwing of the detection nut. When the detection device is working, the locking screw is screwed downwardly and tightly abuts against the workbench, thereby limiting the movement of the sliding plate.

[0010] Specifically, in order to facilitate replacement of different driving rods, the driving rod is provided with a connecting hole at one end away from the driving hole, the connecting hole has a polygonal inner periphery, the connecting head has an outer periphery with the same shape as the inner periphery of the connecting hole, and the connecting head is movably inserted into the connecting hole and can drive the driving rod to rotate. According to different sizes of the detection nut, corresponding driving rods can be replaced respectively.

[0011] Further, in order to facilitate screwing of the detection nut, the detection nut can move along the first axis direction in the driving hole.

[0012] Further, in order to improve the strength of the detection frame, a connecting plate is arranged between the positioning plate and the abutting plate, the connecting plate is fixed on the workbench, and the positioning plate and the abutting plate are both welded on the connecting plate. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic view of an embodiment of the utility model.

[0014] Figure 2 is Figure 1 view of A-A in DETAILED DESCRIPTION

[0015] Referring to Figure 1, the direction of arrow X in the drawing represents the first axis direction. The following describes the bolt torque detection device in the present application, which comprises a workbench 10, a detection frame is fixedly installed on the workbench, the detection frame comprises a locating plate 13 and a pressing plate 12 which are spaced apart along the first axis direction, the locating plate and the pressing plate are both welded on the workbench, two parallel connecting plates 14 are arranged between the locating plate and the pressing plate, the two connecting plates are spaced apart along a direction perpendicular to the first axis direction, the connecting plates are welded on the workbench, and the locating plate and the pressing plate are both welded on the connecting plates. The locating plate, the pressing plate and the connecting plates form a frame structure to improve the strength of the detection frame.

[0016] A locating hole 130 is formed in the locating plate 13 and penetrates the locating plate along the first axis direction, the locating hole 130 is a stepped hole with a small hole facing the pressing plate, a large hole on the side of the locating hole 130 away from the pressing plate is formed as a limiting hole 131, and a small hole on the side of the locating hole facing the pressing plate is formed as a rod passing hole 132. The limiting hole 131 has an inner periphery surface which is the same as the shape of the outer periphery surface of the bolt head 52 of the bolt 50 to be detected. In particular, in the present embodiment, the outer periphery surface of the bolt head of the bolt 50 to be detected is a regular hexagon, and the inner periphery surface of the limiting hole 131 is also a regular hexagon. A screw hole 121 is formed in the pressing plate 12, and the locating hole and the screw hole are coaxially arranged along the first axis direction.

[0017] Two parallel slide rails 11 extending along the first axis direction are fixedly installed on the upper surface of the workbench 10, a sliding groove 151 is formed in the lower surface of the slide plate 15 and slidably clamped on the slide rail, the cross section of the sliding groove 151 is T-shaped, the cross section of the slide rail is T-shaped and matched with the sliding groove, a driving motor 21 is fixedly installed on the slide plate 15, so that the driving motor is slidably clamped on the workbench and can reciprocate along the first axis direction. The driving motor is located on the side of the pressing plate away from the locating plate, and the driving motor is a servo motor. A locking screw 24 is screwed on the slide plate 15 and penetrates the slide plate 15 downward, and the locking screw is screwed downward to tightly press against the workbench and limit the movement of the slide plate.

[0018] It can be understood that in another embodiment, the slide rail can also be fixed on the lower surface of the slide plate, and a corresponding sliding groove can be formed in the workbench to clamp the slide rail in the sliding groove.

[0019] A torque meter 22 is fixedly installed on the driving shaft of the driving motor 21 in the form of a flange, and a joint rod 23 is fixedly installed on the end of the torque meter away from the driving motor in the form of a flange. A display 221 is connected to the data interface of the torque meter.

[0020] The driving rod 30 extends along the first axis direction, is a hollow rod, and has a driving hole 32 and a connecting hole 31 at two ends thereof. The connecting hole has a polygonal inner wall surface, and the connecting head has a polygonal outer wall surface which is the same as the inner wall surface of the connecting hole. The connecting head is movably inserted into the connecting hole and can drive the driving rod to rotate. In this embodiment, the connecting hole has a hexagonal inner wall surface, and the connecting head has a hexagonal outer wall surface which is the same as the inner wall surface of the connecting hole.

[0021] The screw rod 51 of the bolt 50 to be tested can pass through the positioning hole and the screw rod hole in sequence, the detection nut 53 is screwed on the screw rod of the bolt to be tested, and the detection nut 53 is located on the side of the pressing plate 12 away from the positioning plate 13. The detection nut 53 can be accommodated in the driving hole which has an inner wall surface which is the same as the outer wall surface of the detection nut. In this embodiment, the detection nut has a hexagonal outer wall surface, and the driving hole has a hexagonal inner wall surface which is the same as the outer wall surface of the detection nut.

[0022] When the driving rod 30 drives the detection nut to rotate, the detection nut can move along the first axis direction in the driving hole.

[0023] When this embodiment works, first, the slide plate is moved away from the detection frame, so that the distance between the driving rod 30 and the pressing plate 12 can accommodate the detection nut 53. Then, the screw rod 51 of the bolt 50 to be tested passes through the positioning hole 130 and the screw rod hole 121 in sequence, the detection nut 53 is screwed on the end of the screw rod 51 which extends out of the pressing plate 12, and the bolt head 52 of the bolt to be tested is accommodated in the limiting hole 131, so as to avoid driving the bolt to be tested to rotate when the detection nut is screwed. Then, the slide plate is moved towards the detection frame, so that the driving hole 32 of the driving rod 30 is sleeved on the detection nut, the locking bolt is screwed, and the locking bolt is tightly pressed on the workbench to avoid the slide plate from moving when the detection device works. The driving motor is started, the detection nut is rotated, the detection nut is moved towards the detection frame until the detection nut is pressed on the pressing plate, and the detection nut is continuously rotated until the display 221 displays the maximum torque value.

Claims

1. A device for detecting the torque of a bolt, characterized in that The detection device comprises a workbench, a detection frame fixedly installed on the workbench, the detection frame comprising a positioning plate and a pressing plate spaced apart along a first axis direction, a positioning hole being formed on the positioning plate, the positioning hole being formed as a limiting hole on a side away from the pressing plate, the limiting hole having an inner peripheral surface identical to an outer peripheral surface of a bolt head of a bolt to be detected, and a screw hole being formed on the pressing plate, the positioning hole and the screw hole being coaxially arranged along the first axis direction; A driving motor is slidingly clamped on the workbench, the driving motor being capable of reciprocating along the first axis direction, the driving motor being located on a side of the pressing plate away from the positioning plate, an output shaft of the driving motor being provided with a joint rod through a torque instrument, the driving rod having a driving hole at one end, and the other end of the driving rod being detachably connected to the joint rod; the driving motor is a servo motor; a display is connected to a data interface of the torque instrument; A screw rod of the bolt to be detected can pass through the positioning hole and the screw hole in sequence, a detection nut is screwed on the screw rod of the bolt to be detected, and the detection nut is located on a side of the pressing plate away from the positioning plate, the detection nut can be accommodated in the driving hole, and the driving hole has an inner peripheral surface identical to an outer peripheral surface of the detection nut.

2. The detection device of claim 1, wherein, Two sliding grooves extending along the first axis direction and parallel to each other are formed on the workbench, a sliding rail slidingly clamped in the sliding groove is fixedly arranged on a lower surface of a sliding plate, and the driving motor is fixedly installed on the sliding plate; the cross section of the sliding groove is T-shaped, the cross section of the sliding rail is T-shaped and adapted to the sliding groove, and a locking screw is screwed on the sliding plate and downwardly passes through the sliding plate.

3. The detection device of claim 1, wherein, Two sliding rails extending along the first axis direction and parallel to each other are fixedly installed on the workbench, a sliding groove slidingly clamped on the sliding rail is formed on a lower surface of a sliding plate, and the driving motor is fixedly installed on the sliding plate; the cross section of the sliding groove is T-shaped, the cross section of the sliding rail is T-shaped and adapted to the sliding groove, and a locking screw is screwed on the sliding plate and downwardly passes through the sliding plate.

4. The detection device according to claim 1, wherein An end of the driving rod away from the driving hole is provided with a connecting hole, a connecting head is provided at an end of the joint rod away from the driving motor, the connecting hole has a regular polygonal inner peripheral surface, the connecting head has an outer peripheral surface identical to the inner peripheral surface of the connecting hole, and the connecting head is movably inserted into the connecting hole and capable of driving the driving rod to rotate.

5. The detection device of claim 1, wherein, The detection nut has a regular hexagonal outer peripheral surface.

6. The detection device of claim 1, wherein, The detection nut is capable of moving along the first axis direction in the driving hole.

7. The detection device of claim 1, wherein, A connecting plate is arranged between the positioning plate and the pressing plate, the connecting plate is fixed on the workbench, and the positioning plate and the pressing plate are both welded on the connecting plate.

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