A tapping speed testing device for self-tapping screws

Abstract

The utility model provides a kind of for self-tapping screw attack speed testing device, including workbench.Workbench top surface is equipped with the clamping mechanism and tapping mechanism for fixing material to be measured, and speed measuring mechanism.Tapping mechanism includes vertical frame fixed on workbench.Sliding connection on vertical frame on electric drive tool, and the pressure loading component acting on electric drive tool.Electric drive tool is used to clamp and drive the rotation of self-tapping screw to be measured, and the top vertical of electric drive tool is provided with guide rod.Pressure loading component includes at least one pressure weight set on guide rod.Speed measuring mechanism includes rotational speed measuring unit installed at the drive shaft of electric drive tool, and displacement measuring unit for measuring the axial displacement of electric drive tool.The utility model provides constant gravity load for electric drive tool by pressure weight, and the structure is simple and reliable, and weight can keep constant axial load in the whole attack process, greatly improves the standardization degree of test condition.

Description

Technical Field

[0001] This utility model belongs to the field of fastener performance testing technology, specifically relating to a tapping speed testing device for self-tapping screws. Background Technology

[0002] Self-tapping screws are screws with drill tips that can directly tap and tighten into materials. Their penetration performance (such as penetration speed and smoothness) is a key indicator of their quality. Currently, testing the penetration performance of self-tapping screws mostly relies on operators holding a hand drill or screwdriver, judging based on experience or simple timing. This method, through manually applied axial pressure, results in inconsistent and difficult-to-quantify axial pressure, leading to inconsistent test conditions and poor repeatability and comparability of results. Furthermore, it cannot simultaneously and accurately measure the screw's real-time rotational speed and axial feed displacement, thus making it impossible to accurately calculate the tapping speed, i.e., the penetration depth per unit time, making it difficult to analyze penetration performance.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a tapping speed testing device for self-tapping screws, which can simulate different constant axial loads, measure the rotational speed and feed displacement of self-tapping screws, and realize accurate and repeatable testing of the tapping speed of self-tapping screws.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a tapping speed testing device for self-tapping screws, including a worktable. The top surface of the worktable is provided with a clamping mechanism for fixing the material to be tested, a tapping mechanism, and a speed measuring mechanism. The tapping mechanism includes a stand fixed to the worktable. An electric drive tool is slidably connected to the stand, and a pressure loading assembly acts on the electric drive tool. The electric drive tool is used to clamp and drive the self-tapping screw to be tested to rotate, and a guide rod is vertically arranged on the top of the electric drive tool. The pressure loading assembly includes at least one pressure weight sleeved on the guide rod. The speed measuring mechanism includes a speed measuring unit installed at the drive shaft of the electric drive tool, and a displacement measuring unit for measuring the axial displacement of the electric drive tool. The displacement measuring unit includes a displacement sensing component connected to the electric drive tool, and a displacement sensor fixed to the stand and arranged opposite to the displacement sensing component. The displacement sensor is used to detect the relative displacement of the displacement sensing component. This invention provides a constant gravitational load to the electrically driven tool using pressure weights fitted onto the guide rod. The structure is simple and reliable, and the load value can be precisely adjusted by the number of weights, remaining constant throughout the entire tapping process, greatly improving the standardization of testing conditions. During testing, the rotational speed measurement unit and displacement measurement unit synchronously and in real-time collect data on the rotational speed and axial feed displacement of the self-tapping screw, providing a basis for accurately calculating the tapping speed.

[0006] Furthermore, in the aforementioned speed testing device for self-tapping screws, a guide rail is vertically mounted on the stand, located on the side of the stand near the clamping mechanism. The electrically driven tool is slidably connected to the guide rail via the sliding clamping mechanism. A handle is rotatably connected to the stand. One end of the handle is drivenly connected to the sliding clamping mechanism.

[0007] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, one end of the sliding clamping mechanism is provided with a groove that slides and engages with the guide rail. The end of the sliding clamping mechanism away from the guide rail is provided with a mounting groove for mounting an electric drive tool. The mounting groove has a locking groove, and locking elements are inserted on both sides of the locking groove. These locking elements deform the locking groove to lock the electric drive tool in place. By tightening the locking elements (bolts), the locking groove contracts, securely clamping the electric drive tool within the mounting groove, ensuring that the electric drive tool does not shake or shift during tapping, thus improving test stability. Simultaneously, this structure facilitates quick disassembly and replacement of the electric drive tool, improving maintenance convenience.

[0008] Furthermore, in the aforementioned self-tapping screw speed testing device, the electrically driven tool includes a pistol drill and a support housing. The pistol drill has a downward-facing drill chuck that holds a magnetic bit, which is used to attract the self-tapping screw to be tested. The pistol drill is clamped within a mounting slot. The support housing is located outside the pistol drill and is fixedly connected to a sliding clamping mechanism. Pistol drills are commonly used as self-tapping screw installation tools; by using a pistol drill as the power component, the driving method in actual self-tapping screw usage scenarios can be realistically simulated, enhancing the correlation between test results and practical applications.

[0009] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, the guide rod is fixed to the top of the bracket housing.

[0010] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, the clamping mechanism is a bench vise, with stepped clamp plates facing each other. The stepped clamp plates have a primary clamp section, a secondary clamp section, and a tertiary clamp section from bottom to top. The primary, secondary, and tertiary clamp sections form multiple steps. A height-adjustable adjustment plate is detachably connected to the top surface of the tertiary clamp section. This design of stepped clamp plates and a height-adjustable adjustment plate allows for flexible and stable clamping of test materials of various specifications and shapes, from thin plates to profiles, expanding the testing applicability of the device.

[0011] Furthermore, in the aforementioned speed testing device for self-tapping screws, the adjusting plate has a through hole and a first threaded hole. The top surface of the three-stage clamp has a second threaded hole. The through hole corresponds to the second threaded hole. A locking bolt passes through the through hole and is screwed into the second threaded hole to define the horizontal relative position of the adjusting plate and the three-stage clamp. A support bolt is screwed into the first threaded hole, extending out of the first threaded hole and supporting the top surface of the three-stage clamp. By rotating the support bolt, the height of the top surface of the adjusting plate can be precisely adjusted to accommodate materials of different thicknesses or heights. The adjustment process is convenient and the positioning is accurate. Combined with the fixing effect of the locking bolt, it ensures a stable connection between the adjusting plate and the three-stage clamp after adjustment, preventing data accuracy from being affected by material loosening during testing.

[0012] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, the displacement sensor is a photoelectric displacement sensor, and the displacement sensing component is a vertically arranged sensing baffle. A grating strip is provided on the side near the displacement sensor, and the grating strip has a series of parallel, equally wide and spaced light-transmitting slits along its length, alternating with the solid portion. When the electric drive tool drives the self-tapping screw axially, the sensing baffle and the grating strip move synchronously with the electric drive tool. The light beam from the displacement sensor illuminates the moving grating strip. Due to the alternating passage of the slits and the solid portion, the light intensity received by the sensor produces periodic changes in brightness, thereby outputting a corresponding pulse electrical signal. By measuring the number of these pulse signals, the axial displacement of the electric drive tool can be accurately calculated. This non-contact measurement method avoids the influence of mechanical friction on measurement accuracy and also offers a fast response speed.

[0013] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, a through groove is provided on the plate of the displacement sensing component; the displacement sensing component is connected to the bracket housing of the electric drive tool via a locking bolt passing through the through groove. Loosening the locking bolt allows the sensing baffle to be adjusted vertically along the direction of the through groove; after adjustment, the locking bolt is tightened.

[0014] Furthermore, in the aforementioned tapping speed testing device for self-tapping screws, the speed measurement unit is a photoelectric speed sensor. The speed measurement unit is connected to a through hole in the sliding clamping mechanism and is positioned close to the drive shaft of the electric drive tool. The photoelectric speed sensor acquires speed data by detecting the rotation of the drive shaft of the electric drive tool (such as the output shaft of a pistol drill). Its detection end is positioned close to the drive shaft, utilizing the groove on the shaft itself for non-contact speed measurement. This provides advantages such as high measurement accuracy, rapid response, and minimal impact on the running resistance of the drive shaft, ensuring the real-time performance and accuracy of the speed data.

[0015] As can be seen from the above technical solution, this utility model has the following beneficial effects: The self-tapping screw tapping speed testing device of this utility model achieves precise application and adjustment of a constant axial load by setting pressure weights, solving the problems of unstable and unquantifiable pressure in traditional manual testing, and improving the standardization of testing. Simultaneously, it integrates a photoelectric speed sensor and a photoelectric displacement sensor, enabling synchronous and real-time acquisition of speed and axial displacement data during the self-tapping screw's insertion process, providing a reliable basis for tapping speed calculation and effectively improving the accuracy and repeatability of test results. The stepped clamping mechanism and height-adjustable adjustment plate design allow the device to adapt to the stable clamping of materials of different specifications and shapes, significantly expanding the device's applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the tapping speed testing device for self-tapping screws according to the present invention; Figure 2 This is a schematic diagram of the tapping mechanism. Figure 3 for Figure 2 The enlarged view shown below; Figure 4 This is a schematic diagram of the sliding clamping mechanism; Figure 5 This is a schematic diagram of the structure of the electrically driven tool; Figure 6 This is a schematic diagram of the clamping mechanism. Figure 7 This is an exploded view of the clamping mechanism.

[0017] In the diagram: 1. Workbench; 2. Clamping mechanism; 21. Stepped clamp plate; 211. First-stage clamp; 212. Second-stage clamp; 213. Third-stage clamp; 2131. Second threaded hole; 22. Adjusting plate; 221. Through hole; 222. First threaded hole; 3. Tapping mechanism; 30. Stand; 31. Electric drive tool; 311. Guide rod; 312. Pistol drill; 313. Support housing; 32. Pressure weight; 33. Guide rail; 34. Sliding clamping mechanism; 341. Slide groove; 342. Mounting groove; 343. Locking groove; 35. Handle; 4. Speed ​​measuring mechanism; 41. Rotational speed measuring unit; 42. Displacement measuring unit; 421. Displacement sensing component; 4211. Through groove; 422. Displacement sensor. Detailed Implementation

[0018] Example 1 like Figure 1-3The diagram illustrates a tapping speed testing device for self-tapping screws, comprising a worktable 1. The top surface of the worktable 1 is equipped with a clamping mechanism 2 for fixing the material to be tested, a tapping mechanism 3, and a speed measuring mechanism 4. The tapping mechanism 3 includes a stand 30 fixed to the worktable 1. An electric drive tool 31 is slidably connected to the stand 30, and a pressure loading assembly acts on the electric drive tool 31. The electric drive tool 31 is used to clamp and drive the self-tapping screw to be tested to rotate, and a guide rod 311 is vertically arranged on the top of the electric drive tool 31. The pressure loading assembly includes at least one pressure weight 32 sleeved on the guide rod 311. The speed measuring mechanism 4 includes a rotational speed measuring unit 41 mounted at the drive shaft of the electric drive tool 31, and a displacement measuring unit 42 for measuring the axial displacement of the electric drive tool 31. The displacement measuring unit 42 includes a displacement sensing component 421 connected to the electric drive tool 31, and a displacement sensor 422 fixed to the stand 30 and disposed opposite to the displacement sensing component 421. The displacement sensor 422 is used to detect the relative displacement of the displacement sensing component 421.

[0019] like Figure 2 The self-tapping screw tapping speed testing device shown has a vertically mounted guide rail 33 on a stand 30, located near the clamping mechanism 2. An electrically driven tool 31 is slidably connected to the guide rail 33 via a sliding clamping mechanism 34. Stops are provided at both ends of the guide rail 33 to prevent the sliding clamping mechanism 34 from disengaging. A handle 35 is rotatably connected to the stand 30. One end of the handle 35 is driven by the sliding clamping mechanism 34. Pressing and rotating one end of the handle 35 drives the sliding clamping mechanism 34 to slide along the guide rail 33, thereby adjusting the height of the electrically driven tool 31.

[0020] like Figure 4 The tapping speed testing device for self-tapping screws shown has a sliding clamping mechanism 34 with a groove 341 at one end that slides with the guide rail 33. The end of the sliding clamping mechanism 34 away from the guide rail 33 has a mounting groove 342 for mounting an electric drive tool 31. The mounting groove 342 has a locking groove 343, with locking members passing through both sides of the locking groove 343. These locking members deform the locking groove 343 to lock the electric drive tool 31. By tightening the locking members (bolts), the locking groove 343 contracts, securely clamping the electric drive tool 31 within the mounting groove 342.

[0021] like Figure 5The self-tapping screw tapping speed testing device shown includes an electrically driven tool 31 comprising a pistol drill 312 and a support housing 313. The pistol drill 312 has a downward-facing drill chuck that holds a magnetic bit for attracting the self-tapping screw to be tested. The pistol drill 312 is clamped within a mounting slot 342. The support housing 313 is located outside the pistol drill 312 and is fixedly connected to a sliding clamping mechanism 34. The pistol drill 312 is commonly used as an installation tool for self-tapping screws. Here, the pistol drill 312 is used as a power component to realistically simulate the driving method in actual use scenarios of self-tapping screws, enhancing the correlation between test results and practical applications.

[0022] In this embodiment, the guide rod 311 is fixed to the top of the bracket housing 313.

[0023] like Figure 6 The tapping speed testing device for self-tapping screws shown includes a clamping mechanism 2, which is a bench vise. The jaws of the clamping mechanism 2 are provided with a stepped clamp plate 21 facing each other. The stepped clamp plate 21 has a primary clamp section 211, a secondary clamp section 212, and a tertiary clamp section 213 from bottom to top. The primary clamp section 211, secondary clamp section 212, and tertiary clamp section 213 form multiple steps. A height-adjustable adjustment plate 22 is detachably connected to the top surface of the tertiary clamp section 213. This design of stepped clamp plates and a height-adjustable adjustment plate allows for flexible and stable clamping of various specifications and shapes of test materials, from thin plates to profiles, expanding the testing applicability of the device.

[0024] like Figure 7 The tapping speed testing device for self-tapping screws shown has an adjusting plate 22 with a through hole 221 and a first threaded hole 222. A third-stage clamp 213 has a second threaded hole 2131 on its top surface. The through hole 221 corresponds to the second threaded hole 2131. A locking bolt passes through the through hole 221 and is screwed into the second threaded hole 2131 to limit the horizontal relative position of the adjusting plate 22 and the third-stage clamp 213. A support bolt is screwed into the first threaded hole 222, extending out of the first threaded hole 222 and supported on the top surface of the third-stage clamp 213.

[0025] In this embodiment, the displacement sensor 422 is a photoelectric displacement sensor, and the displacement sensing component 421 is a vertically arranged sensing baffle. A grating strip is provided on the side of the grating strip closest to the displacement sensor 422. The grating strip has a series of parallel, equally spaced, parallel light-transmitting slits along its length, alternating with the solid portion. When the electric drive tool 31 drives the self-tapping screw axially, the sensing baffle and the grating strip move synchronously with the electric drive tool 31. The light beam from the displacement sensor illuminates the moving grating strip. Due to the alternating passage of the slits and the solid portion, the light intensity received by the sensor exhibits periodic brightness changes, thereby outputting a corresponding pulse electrical signal. By measuring the number of these pulse signals, the axial displacement of the electric drive tool 31 can be accurately calculated.

[0026] In this embodiment, a through groove 4211 is provided on the plate of the displacement sensing component 421 (see...). Figure 3 The displacement sensing component 421 is connected to the bracket housing 313 of the electric drive tool 31 via a locking bolt passing through the through groove 4211. Loosening the locking bolt allows the sensing baffle 421 to be adjusted vertically along the direction of the through groove 4211. After adjustment, the locking bolt is tightened.

[0027] In this embodiment, the rotation speed measuring unit 41 is a photoelectric rotation speed sensor. The rotation speed measuring unit 41 is connected to the through hole provided in the sliding clamping mechanism 34, and the rotation speed measuring unit 41 is located close to the drive shaft of the electric drive tool 31.

[0028] This utility model includes the following testing steps: The magnetic bit is clamped and locked into the drill chuck of the pistol drill 312, and the self-tapping screw to be tested is magnetically attracted. Press and rotate the handle 35 to drive the sliding clamping mechanism 34 to rise along the guide rail 33 to the appropriate height.

[0029] Depending on the thickness and shape of the material to be tested, different clamping sections of the stepped clamping plate 21 are selected for clamping. For thick plates, the primary clamping section 211 or the secondary clamping section 212 can be used directly for clamping. If necessary, a pad is placed under the material to adjust the height. For thin plates, the tertiary clamping section 213 can be used for clamping, and multiple pads are placed under the material so that the surface to be tested is higher than the top surface of the tertiary clamping section 213. For irregularly shaped materials such as aluminum profiles, the adjusting plate 22 is installed on the top surface of the tertiary clamping section 213. The top surface of the adjusting plate 22 is adjusted to a suitable height by rotating the support bolts, so that the tertiary clamping section 213 clamps the lower end of the aluminum profile, and the adjusting plate 22 clamps the upper end of the aluminum profile to securely clamp the material.

[0030] After the clamping mechanism 2 clamps the material to be tested, the handle 35 is slowly rotated in the opposite direction. At this time, the electric drive tool 31 slides down along the guide rail 33 under the action of gravity, so that the self-tapping screw clamped in the electric drive tool 31 contacts the surface of the material. According to the specifications of the self-tapping screw to be tested and the material, thickness and shape of the material to be tested, the corresponding pressure weight 32 is selected and sleeved on the guide rod 311 to set a constant axial pressure.

[0031] Turn on the knob switch to start the electric drive tool 31, causing it to rotate the self-tapping screw. The gravity of the pressure weight 32 is transmitted to the electric drive tool 31, driving the self-tapping screw to tap into the material. During the tapping process, the speed measurement unit 41 detects the rotation pulse signal of the drive shaft of the pistol drill 312 in real time, and the displacement sensor 422 simultaneously detects the displacement pulse signal generated by the induction baffle 421 as the electric drive tool 31 moves downward, and transmits the data to the data processing system. When the self-tapping screw is fully driven into the material or reaches the preset depth, turn off the electric drive tool 31, rotate the handle 35 in the opposite direction to move the sliding clamping mechanism 34 and the electric drive tool 31 upward, release the clamping mechanism 2, and remove the material.

[0032] The data processing unit processes the received pulse signals, calculates the real-time rotational speed and real-time feed displacement, and calculates the average tapping speed in combination with the tapping time.

[0033] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A tapping speed testing device for self-tapping screws, characterized in that: The device includes a workbench (1); the top surface of the workbench (1) is provided with a clamping mechanism (2) for fixing the material to be tested and a tapping mechanism (3), as well as a speed measuring mechanism (4); the tapping mechanism (3) includes a stand (30) fixed on the workbench (1); an electric drive tool (31) slidably connected to the stand (30), and a pressure loading assembly acting on the electric drive tool (31); the electric drive tool (31) is used to clamp and drive the self-tapping screw to be tested to rotate, and a guide rod (311) is vertically provided on the top of the electric drive tool (31); the pressure loading assembly includes at least one sleeved... The pressure weight (32) on the guide rod (311); the speed measuring mechanism (4) includes a speed measuring unit (41) installed on the drive shaft of the electric drive tool (31) and a displacement measuring unit (42) for measuring the axial displacement of the electric drive tool (31); the displacement measuring unit (42) includes a displacement sensing component (421) connected to the electric drive tool (31) and a displacement sensor (422) fixed on the stand (30) and arranged opposite to the displacement sensing component (421), the displacement sensor (422) being used to detect the relative displacement of the displacement sensing component (421).

2. The tapping speed testing device for self-tapping screws according to claim 1, characterized in that: The stand (30) is vertically provided with a guide rail (33), which is located on the side of the stand (30) near the clamping mechanism (2); the electric drive tool (31) is slidably connected to the guide rail (33) through the sliding clamping mechanism (34); the stand (30) is rotatably connected with a handle (35); one end of the handle (35) is drivenly connected to the sliding clamping mechanism (34).

3. The tapping speed testing device for self-tapping screws according to claim 2, characterized in that: The sliding clamping mechanism (34) has a sliding groove (341) at one end that slides with the guide rail (33); the sliding clamping mechanism (34) has a mounting groove (342) for mounting an electric drive tool (31) at the other end away from the guide rail (33); the mounting groove (342) has a locking groove (343), and locking members are provided on both sides of the locking groove (343). The locking members can deform the locking groove (343) to lock the electric drive tool (31).

4. The tapping speed testing device for self-tapping screws according to claim 3, characterized in that... The electrically driven tool (31) includes a pistol drill (312) and a support housing (313). The pistol drill (312) has a downward-facing drill chuck that holds a magnetic bit. The pistol drill (312) is clamped in a mounting groove (342). The support housing (313) is located outside the pistol drill (312) and is fixedly connected to a sliding clamping mechanism (34).

5. The tapping speed testing device for self-tapping screws according to claim 4, characterized in that: The guide rod (311) is fixed to the top of the housing (313).

6. The tapping speed testing device for self-tapping screws according to claim 1, characterized in that: The clamping mechanism (2) is a bench vise, and the jaws of the clamping mechanism (2) are provided with stepped clamp plates (21) facing each other; the stepped clamp plates (21) are provided with a first-level clamp (211), a second-level clamp (212) and a third-level clamp (213) from bottom to top; the first-level clamp (211), the second-level clamp (212) and the third-level clamp (213) form a multi-level step; the top surface of the third-level clamp (213) is detachably connected to a height-adjustable adjustment plate (22).

7. The tapping speed testing device for self-tapping screws according to claim 6, characterized in that: The adjusting plate (22) is provided with a through hole (221) and a first threaded hole (222); the top surface of the three-stage clamp (213) is provided with a second threaded hole (2131); the through hole (221) is provided corresponding to the second threaded hole (2131); a locking bolt is inserted through the through hole (221), and the locking bolt is screwed into the second threaded hole (2131) to limit the horizontal relative position of the adjusting plate (22) and the three-stage clamp (213); a support bolt is screwed into the first threaded hole (222), and the support bolt extends out of the first threaded hole (222) and is supported on the top surface of the three-stage clamp (213).

8. The tapping speed testing device for self-tapping screws according to claim 1, characterized in that: The displacement sensor (422) is a photoelectric displacement sensor, and the displacement sensing component (421) is a vertically arranged sensing baffle with a grating strip on the side near the displacement sensor (422); the grating strip has a series of light-transmitting slits of equal width and spacing along its length.

9. The tapping speed testing device for self-tapping screws according to claim 4, characterized in that: The displacement sensing component (421) has a through groove (4211) on its plate; the displacement sensing component (421) is connected to the bracket housing (313) of the electric drive tool (31) by a locking bolt passing through the through groove (4211).

10. The tapping speed testing device for self-tapping screws according to claim 1, characterized in that: The rotation speed measuring unit (41) is a photoelectric rotation speed sensor; the rotation speed measuring unit (41) is connected to the through hole provided in the sliding clamping mechanism (34), and the rotation speed measuring unit (41) is set close to the drive shaft of the electric drive tool (31).

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