A torsion strength testing device for metal nails and a method thereof

Abstract

The application relates to the technical field of metal nail detection, in particular to a torsional strength detection device for metal nails and a method thereof, which comprises a torsion device installed on a rack and used for torsional detection of the metal nails, a nail placing device used for pre-placing the metal nails is further arranged above the rack, a transfer device is further arranged on the rack and used for transferring the metal nails in the nail placing device to the torsion device, and a transparent protective cover used for isolating metal scraps generated during detection is further arranged on the rack. The device can realize pre-placing and accurate positioning of the metal nails through the nail placing device, so that the clamping time of the metal nails is reduced and the detection precision is improved; the cooperation of the nail placing device and the transfer device can realize automatic feeding and discharging, so that the operator is prevented from being injured by the chuck, the detection efficiency is improved, the nail placing device of different models can realize unified positioning of the metal nails of corresponding sizes, the nail placing device is easy to replace, and therefore the device is more convenient and efficient to use.

Description

Technical Field

[0001] This invention relates to the field of metal nail testing technology, specifically to a device and method for testing the torsional strength of metal nails. Background Technology

[0002] Metal nails are a common type of fastener. To ensure the quality of metal nail production, sampling inspections are required, including testing the torsional strength of the metal nails.

[0003] Traditional testing equipment has a relatively simple structure, typically only having a protective cover installed on the outside to prevent metal debris from flying. Operators need to manually open the cover after each test to load and unload the metal nails. Manually opening the cover and manually loading / unloading are time-consuming and make it difficult to ensure the nails are clamped in the same position each time, which in turn affects testing accuracy. Furthermore, some metal nails are very small, and manually installing them onto the chuck can easily damage the chuck.

[0004] Therefore, it is difficult to meet the safety and efficiency requirements for metal nail testing. In view of this, this application provides a device and method for testing the torsional strength of metal nails. Summary of the Invention

[0005] The present invention provides the following technical solution: a device for testing the torsional strength of metal nails, comprising a frame, on which a pair of torsion devices are symmetrically arranged, each torsion device comprising an electric push rod fixed on the frame, and the output end of the electric push rod being fixed to a main motor via a mounting bracket, and the output shaft of the main motor being connected to a power chuck for clamping metal nails via a torque sensor; A transparent protective cover is fixed on the frame, and a controller is fixed at the front end of the transparent protective cover. A pair of second motors are symmetrically installed on the left and right sides of the transparent protective cover, and a nail-laying device is provided on the transparent protective cover. The nail-laying device includes a rotating frame, and the output end of the second motor is connected to the rotating frame through a plug-in shaft. The rotating frame is provided with at least a pair of mounting slots, and metal nails are clamped in the mounting slots by elastic clips. The transparent protective cover is provided with a transfer device for transferring metal nails from the nail-laying device to the power chuck. The transfer device includes a first motor fixed to the transparent protective cover. The output end of the first motor drives a rotating arm, and the rotating arm drives a clamping plate to clamp the metal nails through a pair of clamping push rods. The controller is electrically connected to the electric push rod, the main motor, the torque sensor, the power chuck, the first motor, the second motor, and the clamping push rods.

[0006] Preferably, an angle sensor for detecting the rotation angle of the main motor output shaft is fixedly installed on the mounting bracket, and a pressure sensor for detecting the clamping force between the clamping plate and the metal nail is fixedly installed on the clamping plate. A display for displaying the detection results is fixedly installed at the front end of the transparent protective cover, and the controller is electrically connected to the angle sensor, the pressure sensor and the display respectively.

[0007] Preferably, a bracket is rotatably mounted on the rotating frame via a bearing, and the bracket is fixedly mounted to the transparent protective cover via a screw. A handle for convenient overall handling of the nail placement device is fixedly mounted on the bracket, and the rotating frame is arranged in a circumferential array with at least eight mounting slots.

[0008] Preferably, a sleeve is slidably mounted coaxially on the rotating frame, and an annular clamp is fixedly mounted on the outer side of the sleeve. The annular clamp is used to clamp the head of the metal nail to the outer side of the rotating frame, and the annular clamp is connected to the rotating frame by a return spring.

[0009] Preferably, a positioning groove is provided at the center of the rotating frame, and a limiting protrusion that is integrally formed on the plug shaft to cooperate and lock with the positioning groove.

[0010] Preferably, both the first motor and the second motor are stepper motors, and the controller is a PLC controller.

[0011] A testing method for a torsional strength testing device for metal nails includes the following steps: Step 1: The operator selects the appropriate nail placement device according to the size of the metal nail to be tested. Then, the operator places the metal nail into the mounting slot of the nail placement device in advance. After that, the nail placement device is plugged into the plug shaft located on the left side of the frame, and an empty nail placement device of the same model is installed on the plug shaft located on the right side of the frame. The operator opens the testing program through the controller, inputs the size data of the metal nail to be tested, and then starts the testing program. The controller can then perform the test according to the preset program. Step 2: First, the first motor drives the rotating arm to swing to the left to the material picking station. Then, the clamping plate is pushed by the clamping push rod to clamp the metal nail at the bottom of the nail placement device on the left side of the frame. Then, the clamping push rod rotates to the right, so that the metal nail is disengaged from the mounting slot and transferred to the clamp changing station. Step 3: After the metal nail moves to the clamping station, the nail-laying device on the left side of the frame will rotate at a specified angle under the drive of the second motor, so that the metal nail in another mounting slot will rotate to the material-picking station at the bottom of the nail-laying device. At the same time, two electric push rods drive the power chuck to move toward the metal nail to the preset position, and then use the power chuck to clamp the metal nail. Afterwards, the clamping push rod releases the metal nail and moves to the right to the waiting position under the drive of the first motor. Step 4: The two main motors apply the specified torque to the metal nail in opposite directions according to the preset program. At the same time, the torque sensor transmits the torque data to the controller in real time. After the inspection is completed, the torsion device at the front of the frame releases the metal nail and moves forward to the waiting position. The torsion device at the rear of the frame moves backward to the waiting position while still clamping the metal nail. The controller reminds the operator to observe through a speaker electrically connected to the controller. Step 5: The operator observes the inspected metal nail through the transparent protective cover and then issues corresponding instructions to the controller based on the observation results. When the metal nail is severely deformed, the torsion device at the rear end will directly release the metal nail, causing it to fall below the frame. The controller then repeats steps 2 to 5 until the specified number of cycles. When the metal nail is not obviously deformed, the rotating arm first swings to the left side of the frame, and then the torsion device at the rear of the frame moves back to the clamping position. The rotating arm then moves to the right to the clamping position and clamps the metal nail. The torsion device at the rear of the frame then releases the metal nail and moves backward to the waiting position. The transfer device then rotates the metal nail to the right to the return station. At this time, the metal nail clamped by the clamping plate is inserted into the mounting slot of the nail placement device on the right side of the frame. The transfer device then releases the metal nail and moves to the waiting position, while the nail placement device on the right side of the frame rotates at a specified angle so that an empty mounting slot moves to the return station. The controller then repeats steps 2 to 5 until the specified number of cycles.

[0012] Compared with the prior art, the beneficial effects of the torsional strength testing device and method for metal nails of the present invention are: 1. The nail placement device enables the pre-placement and precise positioning of metal nails, thereby reducing the time required to clamp the metal nails and improving detection accuracy.

[0013] 2. The combination of the nail-laying device and the transfer device enables automatic loading and unloading, thereby preventing operators from being injured by the chuck and improving inspection efficiency.

[0014] 3. Different models of nail-laying devices can achieve uniform positioning of metal nails of corresponding sizes, and the nail-laying devices are easy to replace, making them more convenient and efficient to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a cross-sectional view of the structure of the present invention; Figure 4 This is a schematic diagram of the installation of the frame and the torsion device in this invention; Figure 5 This is a schematic diagram of the transparent protective cover in this invention; Figure 6 This is a schematic diagram of the nail-laying device in this invention; Figure 7 This is a cross-sectional view of the nail-laying device in this invention; Figure 8 This is a schematic diagram of the transfer device in this invention.

[0016] In the diagram: 1. Frame; 2. Transfer device; 201. First motor; 202. Rotating arm; 203. Clamping push rod; 204. Clamping plate; 205. Pressure sensor; 3. Metal nail; 4. Nail placement device; 401. Mounting slot; 402. Elastic clamp; 403. Handle; 404. Socket; 405. Rotating frame; 406. Positioning slide; 407. Return spring; 408. Bracket; 409. Screw; 410. Annular clamp; 5. Torque device; 501. Power chuck; 502. Mounting frame; 503. Torque sensor; 504. Angle sensor; 505. Main motor; 506. Electric push rod; 6. Transparent protective cover; 7. Controller; 8. Display; 9. Insertion shaft; 10. Limiting protrusion; 11. Second motor. Detailed Implementation

[0017] To clearly and completely describe the objectives and technical solutions of this invention, and to more clearly illustrate its advantages, the embodiments of this invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this invention, and are merely used to explain the embodiments of this invention. They are not intended to limit the embodiments of this invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0018] Example 1: Please refer to Figures 1 to 4 This invention provides a device for testing the torsional strength of metal nails, comprising a frame 1, on which a pair of torsion devices 5 are symmetrically arranged. Each torsion device 5 includes an electric push rod 506 fixed to the frame 1, and a main motor 505 is fixed to the output end of the electric push rod 506 via a mounting bracket 502. The output shaft of the main motor 505 is connected to a power chuck 501 for clamping metal nails 3 via a torque sensor 503. The main motor 505 applies torque to the metal nails 3, and the power chuck 501 clamps the metal nails 3.

[0019] Please see Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 and Figure 7A transparent protective cover 6 is fixed on the frame 1. The transparent protective cover 6 is used to facilitate the operator's observation of the state of the metal nails 3 after testing, and can also prevent the operator from being accidentally injured by metal fragments that are splashed during the testing process. A controller 7 is fixed to the front end of the transparent protective cover 6. A pair of second motors 11 are symmetrically installed on the left and right sides of the transparent protective cover 6. A nail placement device 4 is set on the transparent protective cover 6. The operator can place the metal nails 3 to be tested in advance through the nail placement device 4, and can also place new metal nails on the nail placement device 4 at any time during the testing process. The nail anti-nailing device 4 can also be used to collect metal nails 3 that have not been obviously deformed after testing, so as to facilitate further testing. The nail-laying device 4 includes a rotating frame 405, and the output end of the second motor 11 is connected to the rotating frame 405 via a plug-in shaft 9. The rotating frame 405 is provided with a mounting groove 401, and the metal nail 3 is clamped in the mounting groove 401 by an elastic clip 402. A bracket 408 is rotatably mounted on the rotating frame 405 via a bearing, and the bracket 408 is fixedly mounted to the transparent protective cover 6 via a screw 409. A handle 403 for easy overall handling of the nail-laying device 4 is fixedly mounted on the bracket 408, and the rotating frame 405 is arranged in a circumferential array with at least eight mounting grooves 401. A sleeve 404 is coaxially slidably mounted on the rotating frame 405, and an annular clamp 410 is fixedly mounted on the outer side of the sleeve 404. The annular clamp 410 is used to clamp the head of the metal nail 3 to the outer side of the rotating frame 405. The annular clamp 410 and the rotating frame 405 are connected by a return spring 407. When the operator places the metal nail 3 on the nail placement device 4, the head of the metal nail 3 needs to be clamped between the annular clamp 410 and the rotating frame 405. This facilitates the uniformity of the front and rear distance of the metal nail 3 on the nail placement device 4, thereby ensuring that the metal nail 3 transferred to the power chuck 501 by the transfer device 2 can be uniformly clamped in the same position, thus facilitating high-precision detection. The annular clamp 410 can also be further provided with grooves corresponding to the head shape of the metal nail 3, thereby improving the positioning effect of metal nails 3 with irregular heads and ensuring that the metal nails 3 maintain a uniform position. The nail-laying device 4 has different models, allowing for the installation of metal nails 3 of corresponding sizes through the mounting slots 401. This facilitates the uniform transfer of metal nails 3 of different sizes onto the power chuck 501 via the transfer device 2, using the limiting function of the nail-laying device 4. Furthermore, since the nail-laying device 4 can pre-install metal nails 3 and easily and quickly install them onto the insertion shaft 9, it enables rapid loading of metal nails 3 during inspection. A positioning groove 406 is provided at the center of the rotating frame 405, and a limiting protrusion 10 is integrally formed on the insertion shaft 9 to engage and lock with the positioning groove 406, thus preventing relative rotation between the rotating frame 405 and the insertion shaft 9.

[0020] Please see Figure 2 , Figure 3and Figure 8 The transparent protective cover 6 is provided with a transfer device 2 for transferring the metal nail 3 from the nail-laying device 4 to the power chuck 501. The transfer device 2 includes a first motor 201 fixed to the transparent protective cover 6. The output end of the first motor 201 drives a rotating arm 202, and the rotating arm 202 drives a clamping plate 204 to clamp the metal nail 3 through a pair of clamping push rods 203.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 8 The controller 7 is electrically connected to the electric push rod 506, the main motor 505, the torque sensor 503, the power chuck 501, the first motor 201, the second motor 11, and the clamping push rod 203. An angle sensor 504 for detecting the rotation angle of the output shaft of the main motor 505 is fixedly mounted on the mounting bracket 502, and a pressure sensor 205 for detecting the clamping force between the clamping plate 204 and the metal nail 3 is fixedly mounted on the clamping plate 204. A display 8 for displaying the detection results is fixedly mounted on the front end of the transparent protective cover 6, and the controller 7 is electrically connected to the angle sensor 504, the pressure sensor 205, and the display 8. Both the first motor 201 and the second motor 11 are stepper motors, and the controller 7 is a PLC controller.

[0022] Working principle: This equipment allows the operator to pre-place the metal nails on the nail-laying device 4, and then insert the nail-laying device into the insertion shaft 9. The transfer device 2 then transfers the metal nails on the nail-laying device 4 to the power chuck 501, enabling the operator to automatically clamp the metal nails 3 without opening the transparent protective cover 6. This not only improves the detection speed but also provides better protection.

[0023] Example 2: Based on Example 1, the present invention also provides a testing method for a torsional strength testing device for metal nails, comprising the following steps: Step 1: The operator selects the appropriate nail placement device 4 according to the size of the metal nail 3 to be tested. Then, the operator places the metal nail 3 into the mounting slot 401 of the nail placement device 4 in advance. Then, the operator inserts the nail placement device 4 into the insertion shaft 9 located on the left side of the frame 1, and installs an empty nail placement device 4 of the same model on the insertion shaft 9 located on the right side of the frame 1. The operator opens the testing program through the controller 7, inputs the size data of the metal nail 3 to be tested, and then starts the testing program. The controller 7 can then perform the test according to the preset program. Step 2: First, the first motor 201 drives the rotating arm 202 to swing to the left to the material picking station. Then, the clamping push rod 203 pushes the clamping plate 204 to clamp the metal nail 3 at the bottom of the nail placement device 4 on the left side of the frame 1. Then, the clamping push rod 203 rotates to the right, so that the metal nail 3 is disengaged from the mounting slot 401 and transferred to the clamp changing station. Step 3: When the metal nail 3 moves to the clamping station, the nail-laying device 4 located on the left side of the frame 1 will rotate at a specified angle under the drive of the second motor 11, so that the metal nail 3 located in another mounting slot 401 will rotate to the material picking station located at the bottom of the nail-laying device 4. At the same time, the two electric push rods 506 drive the power chuck 501 to move toward the metal nail 3 to the preset position, and then use the power chuck 501 to clamp the metal nail 3. Then the clamping push rod 203 releases the metal nail 3 and moves to the right to the waiting position under the drive of the first motor 201. Step 4: The two main motors 505 apply the specified torque to the metal nail 3 in opposite directions according to the preset program. At the same time, the torque sensor 503 transmits torque data to the controller 7 in real time. After the inspection is completed, the torsion device 5 located at the front end of the frame 1 releases the metal nail 3 and moves forward to the waiting position. The torsion device 5 located at the rear end of the frame 1 moves backward to the waiting position while still clamping the metal nail 3. The controller 7 reminds the operator to observe through a speaker electrically connected to the controller 7. Step 5: The operator observes the tested metal nail through the transparent protective cover 6, and then issues a corresponding command to the controller 7 based on the observation results. When the metal nail 3 is severely deformed, the torsion device 5 at the rear end will directly release the metal nail 3, causing it to fall below the frame 1. The controller 7 then repeats steps 2 to 5 until the specified number of cycles. When the metal nail 3 is no longer significantly deformed, the rotating arm 202 first swings to the left side of the frame 1, and then the torsion device 5 at the rear of the frame 1 moves back to the clamping position. Then, the rotating arm 202 moves to the right to the clamping position. The metal nail 3 is positioned and clamped. Then, the torsion device 5 located behind the frame 1 releases the metal nail 3 and moves backward to the waiting position. Meanwhile, the transfer device 2 rotates the metal nail 3 to the right to the return station. At this time, the metal nail 3 clamped by the clamping plate 204 is inserted into the mounting slot 401 of the nail placement device 4 located on the right side of the frame 1. Then, the transfer device 2 releases the metal nail 3 and moves to the waiting position. The nail placement device 4 located on the right side of the frame 1 rotates at a specified angle so that an empty mounting slot 401 moves to the return station. Then, the controller 7 repeats steps two to five until the specified number of cycles are completed.

[0024] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A device for testing the torsional strength of metal nails, comprising a frame (1), characterized in that: A pair of torsion devices (5) are symmetrically arranged on the frame (1). The torsion device (5) includes an electric push rod (506) fixed on the frame (1). The output end of the electric push rod (506) is fixed with a main motor (505) through a mounting bracket (502). The output shaft of the main motor (505) is connected to a power chuck (501) for clamping the metal nail (3) through a torque sensor (503). A transparent protective cover (6) is fixed on the frame (1), and a controller (7) is fixed at the front end of the transparent protective cover (6). A pair of second motors (11) are symmetrically installed on the left and right sides of the transparent protective cover (6), and a nail-laying device (4) is provided on the transparent protective cover (6). The nail-laying device (4) includes a rotating frame (405), and the output end of the second motor (11) is connected to the rotating frame (405) through a plug-in shaft (9). At least one pair of mounting slots (401) are provided on the rotating frame (405), and metal nails (3) are clamped in the mounting slots (401) by elastic clips (402). The transparent protective cover (6) is provided with a transfer device (2) for transferring the metal nail (3) from the nail placement device (4) to the power chuck (501). The transfer device (2) includes a first motor (201) fixed to the transparent protective cover (6). The output end of the first motor (201) drives a rotating arm (202). The rotating arm (202) drives a clamping plate (204) to clamp the metal nail (3) through a pair of clamping push rods (203). The controller (7) is electrically connected to the electric push rod (506), the main motor (505), the torque sensor (503), the power chuck (501), the first motor (201), the second motor (11), and the clamping push rods (203).

2. The torsional strength testing device for metal nails according to claim 1, characterized in that: An angle sensor (504) for detecting the rotation angle of the output shaft of the main motor (505) is fixedly installed on the mounting bracket (502), and a pressure sensor (205) for detecting the clamping force between the clamping plate (204) and the metal nail (3) is fixedly installed on the clamping plate (204). A display (8) for displaying the detection results is fixedly installed at the front end of the transparent protective cover (6), and the controller (7) is electrically connected to the angle sensor (504), the pressure sensor (205) and the display (8) respectively.

3. The torsional strength testing device for metal nails according to claim 1, characterized in that: The rotating frame (405) is rotatably mounted with a bracket (408) via a bearing, and the bracket (408) is fixedly mounted with the transparent protective cover (6) via a screw (409). The bracket (408) is fixedly mounted with a handle (403) for easy overall handling of the nail placement device (4), and the rotating frame (405) is arranged in a circumferential array with at least eight mounting slots (401).

4. The torsional strength testing device for metal nails according to claim 1, characterized in that: A sleeve (404) is slidably mounted on the rotating frame (405) on the same axis, and an annular clamp (410) is fixedly mounted on the outside of the sleeve (404). The annular clamp (410) is used to clamp the head of the metal nail (3) to the outside of the rotating frame (405). The annular clamp (410) and the rotating frame (405) are connected by a return spring (407).

5. The torsional strength testing device for metal nails according to claim 1, characterized in that: The rotating frame (405) has a positioning groove (406) at its center, and the insertion shaft (9) has an integrally formed limiting protrusion (10) that cooperates with and locks into the positioning groove (406).

6. The torsional strength testing device for metal nails according to claim 1, characterized in that: The first motor (201) and the second motor (11) are both stepper motors, and the controller (7) is a PLC controller.

7. A testing method for a torsional strength testing device for metal nails as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: The operator selects the appropriate nail placement device (4) according to the size of the metal nail (3) to be tested. Then, the operator places the metal nail (3) into the mounting slot (401) of the nail placement device (4) in advance. Then, the nail placement device (4) is plugged into the plug shaft (9) on the left side of the frame (1), and an empty nail placement device (4) of the same model is installed on the plug shaft (9) on the right side of the frame (1). The operator opens the testing program through the controller (7) and inputs the size data of the metal nail (3) to be tested. Then, the testing program is started, and the controller (7) can perform the test according to the preset program. Step 2: First, the first motor (201) drives the rotating arm (202) to swing to the left to the material picking station. Then, the clamping push rod (203) pushes the clamping plate (204) to clamp the metal nail (3) at the bottom of the nail placement device (4) on the left side of the frame (1). Then, the clamping push rod (203) rotates to the right, so that the metal nail (3) is disengaged from the mounting slot (401) and transferred to the clamp changing station. Step 3: When the metal nail (3) moves to the clamping station, the nail-laying device (4) located on the left side of the frame (1) will rotate at a specified angle under the drive of the second motor (11), so that the metal nail (3) located in another mounting slot (401) will rotate to the material picking station located at the bottom of the nail-laying device (4). At the same time, the two electric push rods (506) drive the power chuck (501) to move toward the metal nail (3) to the preset position, and then use the power chuck (501) to clamp the metal nail (3). Then the clamping push rod (203) releases the metal nail (3) and moves to the right to the waiting position under the drive of the first motor (201). Step 4: The two main motors (505) apply the specified torque to the metal nail (3) in opposite directions according to the preset program. At the same time, the torque sensor (503) transmits the torque data to the controller (7) in real time. After the inspection is completed, the torsion device (5) located at the front end of the frame (1) releases the metal nail (3) and moves forward to the waiting position. The torsion device (5) located at the rear end of the frame (1) moves backward to the waiting position while still clamping the metal nail (3). The controller (7) reminds the operator to observe through the speaker electrically connected to the controller (7). Step 5: The operator observes the tested metal nail through the transparent protective cover (6), and then issues a corresponding instruction to the controller (7) based on the observation results. When the metal nail (3) is severely deformed, the torsion device (5) at the rear end will directly release the metal nail (3), causing the metal nail (3) to fall below the frame (1). Then the controller (7) repeats steps 2 to 5 until the specified number of cycles. When the metal nail (3) is not obviously deformed, the rotating arm (202) first swings to the left side of the frame (1), and then the torsion device (5) at the rear of the frame (1) moves back to the clamping position. Then the rotating arm (202) moves to the right to the clamping position and... The metal nail (3) is clamped, and then the torsion device (5) located behind the frame (1) releases the metal nail (3) and moves backward to the waiting position. The transfer device (2) rotates the metal nail (3) to the right to the return station. At this time, the metal nail (3) clamped by the clamping plate (204) is inserted into the mounting slot (401) of the nail placement device (4) located on the right side of the frame (1). Then the transfer device (2) releases the metal nail (3) and moves to the waiting position. The nail placement device (4) located on the right side of the frame (1) rotates at a specified angle so that an empty mounting slot (401) moves to the return station. Then the controller (7) repeats steps two to five until the specified number of cycles.

Images