A self-tapping screw pull-out clip device

Abstract

The utility model discloses a self -tapping screw anti -pulling clamp device of adjustable size, including upper clamp and lower clamp, the inside of upper clamp and lower clamp is symmetrically equipped with two V type holding pieces, two V type holding pieces all are commonly installed with guide component, and the bottom fixed connection of bottom single guide component has the assembly seat, the top fixed connection of assembly seat has pneumatic parallel clamp jaw, in the utility model, through the symmetric setting of V type holding piece driven by pneumatic parallel clamp jaw in upper clamp and lower clamp, and cooperate with the linkage component of guide, can synchronous, automatic clamping and centering pull ring and screw end's flat pad, and one -time completion is in the middle, thoroughly eliminated the link of needing secondary manual adjustment under the force state in traditional method, thereby greatly promoted the operation safety, test efficiency, and fundamentally avoided eccentric load, guaranteed the accuracy and repeatability of anti -pulling force test data.

Description

Technical Field

[0001] This utility model relates to the field of clamping technology, and in particular to an adjustable-size self-tapping screw anti-pull-out clamping device. Background Technology

[0002] The self-tapping screw pull-out test is an experimental method used to evaluate the ability of self-tapping screws to resist pull-out in different materials. This type of test typically involves inserting the self-tapping screw into a specific material (such as wood, bamboo, or composite materials) and measuring the screw's pull-out resistance by applying tensile force. The experimental results can reveal the screw's load-bearing capacity, failure mode, and influencing factors in different materials, such as screw diameter, embedment depth, and material density.

[0003] Currently, the pull-out test process for self-tapping screws has significant drawbacks: the screw, flat washer, and tension ring must first be assembled into a workpiece, which is then placed between the upper and lower clamps of the material testing machine. Because precise alignment is difficult to guarantee during initial clamping, the operator must pause the experiment after the testing machine applies an initial load and the workpiece is suspended, and manually perform a secondary adjustment to ensure the tension ring engages within the step of the upper clamp. This process is not only cumbersome and inefficient, but also poses safety hazards due to adjustments under stress. Furthermore, the inconsistent nature of manual alignment easily introduces eccentric loads, affecting the accuracy and repeatability of the test data.

[0004] To address this, we propose an adjustable-size self-tapping screw anti-pull-out clamp device. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies by proposing an adjustable-size self-tapping screw anti-pull-out clamp device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an adjustable-size self-tapping screw anti-pull-out clamping device, comprising an upper clamp and a lower clamp, wherein two V-shaped clamping members are symmetrically provided on the inner side of both the upper clamp and the lower clamp;

[0007] Both of the V-shaped clamps are equipped with a guide assembly, and the bottom of the bottom single guide assembly is fixedly connected to a mounting base;

[0008] The top of the assembly base is fixedly connected to a pneumatic parallel gripper, and both movable ends of the pneumatic parallel gripper are fixedly connected to a connecting block, and the connecting block is fixedly connected to the adjacent V-shaped clamping member.

[0009] Both connecting blocks are fixedly connected to the top of a linkage component, and the movable end of the linkage component is fixedly connected to the adjacent V-shaped clamping component.

[0010] The four V-shaped clamping members are all provided with self-tapping screws for the test workpiece.

[0011] Furthermore, each of the four V-shaped clamping components includes a V-shaped clamping block, and the four V-shaped clamping blocks are respectively disposed on the inner side of the upper clamp and the lower clamp. The connecting block is fixedly connected to the adjacent V-shaped clamping block. The two clamping surfaces of the V-shaped clamping block are provided with assembly grooves. Several rollers are rotatably connected to the inner walls on both sides of the two assembly grooves, which enhances the automatic centering effect.

[0012] Furthermore, both of the guide components include a fixed seat, and the two fixed seats are respectively fixedly connected to the upper clamp and the lower clamp, and the assembly seat is fixedly connected to the adjacent fixed seat. The fixed seat is fixedly connected to a guide rail on one side of the V-shaped clamp, and the guide rail is slidably connected to the two adjacent V-shaped clamps. Through the slidable connection between the guide rail and the V-shaped clamp, linear guidance is provided for the reciprocating motion of the clamp.

[0013] Furthermore, both of the aforementioned linkage components include guide rods, which are fixedly connected to the top of adjacent connecting blocks. A slider is slidably sleeved on the outer surface of the guide rod, and the slider is fixedly connected to the adjacent V-shaped clamping block. This linkage structure, through the cooperation of the connecting block, guide rod, and slider, ensures that a pneumatic parallel gripper can simultaneously drive the upper and lower V-shaped clamping blocks to achieve synchronous movement.

[0014] Furthermore, the self-tapping screw test workpiece includes a self-tapping screw body, and a flat washer is fitted on the outer surface of the self-tapping screw body. The flat washer is located inside the upper clamp. The flat washer is placed inside the upper clamp and held by a V-shaped clamping block, providing a flat and uniform force-bearing surface for the screw head. This ensures that the tensile force applied by the testing machine can be evenly transmitted to the screw head through the flat washer, avoiding stress concentration and making the test results more accurately reflect the screw's pull-out resistance.

[0015] Furthermore, a tension ring is threaded onto the outer surface of the self-tapping screw body, and the tension ring is located inside the lower clamp. Placing the tension ring inside the lower clamp simulates the real working condition of the screw being pulled out through the threads in actual use.

[0016] The beneficial effects of this utility model are:

[0017] In use, this invention utilizes V-shaped clamping components driven by pneumatic parallel jaws, symmetrically arranged within the upper and lower clamps. Combined with guiding and linkage components, these components synchronously and automatically clamp and center the tension ring and the flat washer at the screw end, completing centering in one step. This completely eliminates the need for secondary manual adjustment under stress, a step required in traditional methods. This significantly improves operational safety and testing efficiency, fundamentally avoids eccentric loads, and ensures the accuracy and repeatability of pull-out force test data. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a first-person perspective three-dimensional structural diagram of the present invention;

[0020] Figure 2 For the present utility model Figure 1 Enlarged view of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the overall second-view three-dimensional structure of this utility model;

[0022] Figure 4 For the present utility model Figure 2 Enlarged view of point B in the middle.

[0023] The attached figures are labeled as follows:

[0024] 1. Upper clamp; 2. Flat washer; 3. Tension ring; 4. Lower clamp; 5. Self-tapping screw body; 6. Pneumatic parallel gripper; 7. Assembly slot; 8. V-shaped clamping block; 9. Roller shaft; 10. Guide rod; 11. Connecting block; 12. Fixed seat; 13. Assembly seat; 14. Slider; 15. Guide rail. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figures 1-4 As shown, an adjustable-size self-tapping screw anti-pull-out clamping device is disclosed, comprising an upper clamp 1 and a lower clamp 4. Two V-shaped clamping members are symmetrically arranged on the inner sides of both the upper clamp 1 and the lower clamp 4. Each of the four V-shaped clamping members includes a V-shaped clamping block 8, and the four V-shaped clamping blocks 8 are respectively disposed on the inner sides of the upper clamp 1 and the lower clamp 4. Assembly grooves 7 are formed on both clamping surfaces of the V-shaped clamping blocks 8. Several rollers 9 are rotatably connected to the inner walls of both sides of the two assembly grooves 7. The assembly grooves 7 on the two clamping surfaces of the V-shaped clamping blocks 8 provide installation positions and running space for the rollers 9. The rollers 9 are multiple small high-carbon chromium bearing steel needle rollers or miniature rollers with smooth surfaces and high hardness. They are rotatably connected within the assembly grooves 7 by pins.

[0027] Both V-shaped clamping components are equipped with guide components. The bottom of each guide component is fixedly connected to a mounting base 13. Both guide components include a fixed base 12, and the two fixed bases 12 are fixedly connected to the upper clamp 1 and the lower clamp 4 respectively. The mounting base 13 is fixedly connected to the adjacent fixed base 12. The fixed base 12 is located on one side of the V-shaped clamping block 8 and is fixedly connected to a guide rail 15. The guide rail 15 is slidably connected to the two adjacent V-shaped clamping blocks 8. The guide rail 15 ensures that the V-shaped clamping block 8 can only make linear reciprocating motion along the preset guide rail 15 direction under the pneumatic gripper drive, eliminating any deviation or shaking in any direction, thereby ensuring the synchronization and stability of clamping.

[0028] A pneumatic parallel gripper 6 is fixedly connected to the top of the mounting base 13. Both movable ends of the pneumatic parallel gripper 6 are fixedly connected to connecting blocks 11, and the connecting blocks 11 are fixedly connected to adjacent V-shaped grippers 8. The pneumatic parallel gripper 6 is the drive source of the device; it controls the inlet and outlet of compressed air through a solenoid valve, thereby driving its two movable ends to perform precise, synchronous, opposite or reciprocating movements. Its advantages include fast operation, stable output force, and simple control, making it very suitable for automated scenarios requiring rapid clamping.

[0029] Both connecting blocks 11 are fixedly connected to the top of a linkage component, and the movable end of the linkage component is fixedly connected to the adjacent V-shaped clamping component. Both linkage components include a guide rod 10, and the guide rod 10 is fixedly connected to the top of the adjacent connecting block 11. A slider 14 is slidably sleeved on the outer surface of the guide rod 10, and the slider 14 is fixedly connected to the adjacent V-shaped clamping block 8.

[0030] The four V-shaped clamps share a common self-tapping screw test workpiece. The self-tapping screw test workpiece includes a self-tapping screw body 5. A flat washer 2 is fitted on the outer surface of the self-tapping screw body 5, and the flat washer 2 is located inside the upper clamp 1. A tension ring 3 is threaded onto the outer surface of the self-tapping screw body 5, and the tension ring 3 is located inside the lower clamp 4.

[0031] Initial placement: The operator places the assembled self-tapping screw test workpiece (consisting of the self-tapping screw body 5, flat washer 2, and tension ring 3) between the upper clamp 1 and the lower clamp 4. The tension ring 3 is placed between the two V-shaped clamps 8 of the lower clamp 4, and the flat washer 2 at the screw head end is placed between the two V-shaped clamps 8 of the upper clamp 1.

[0032] Pneumatic drive and synchronous clamping: The pneumatic parallel gripper 6 is activated. The two movable ends of the pneumatic parallel gripper 6 drive the two connected V-shaped clamping blocks 8 to slide towards each other along the guide rail 15 via the connecting block 11. Due to the presence of the linkage assembly (guide rod 10 and slider 14), the movement of each connecting block 11 synchronously drives the other V-shaped clamping block 8 above it to move. Thus, the two pairs of V-shaped clamping blocks 8 in the upper clamp 1 and lower clamp 4 achieve a four-way synchronous closed movement, simultaneously clamping the tension ring 3 and the flat pad 2 radially.

[0033] Automatic centering and protection: The unique configuration of the V-shaped clamp 8 allows it to adapt to workpieces of different diameters. During clamping, the V-shaped inclined surface automatically guides the workpiece (tension ring 3 or flat washer 2) to slide to the center point of the V-groove, thereby achieving automatic centering and ensuring that the axis of the self-tapping screw body 5 is completely aligned with the loading force axis of the testing machine, eliminating eccentric loads.

[0034] Testing: Once the workpiece is reliably clamped and centered, the material testing machine can directly perform pull-out force testing. Furthermore, the roller 9 embedded in the V-clamp 8 can roll after clamping, effectively reducing friction with the workpiece and preventing the V-clamp 8 from interfering with the test. The entire clamping process is completed quickly, eliminating the need to pause the testing machine after initial loading and perform dangerous manual adjustments.

[0035] Release and reset: After the test is completed, the pneumatic parallel gripper 6 moves in the opposite direction, driving all V-shaped clamps 8 to reset and open synchronously along the guide rail 15, so that the tested workpiece can be easily removed.

[0036] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An adjustable-size self-tapping screw anti-pull-out clamping device, comprising an upper clamp (1) and a lower clamp (4), characterized in that: The inner sides of the upper clamp (1) and the lower clamp (4) are symmetrically provided with two V-shaped clamping members; Both of the V-shaped clamps are equipped with guide components, and the bottom of the bottom single guide component is fixedly connected to a mounting base (13); The top of the mounting base (13) is fixedly connected to a pneumatic parallel gripper (6), and both movable ends of the pneumatic parallel gripper (6) are fixedly connected to a connecting block (11), and the connecting block (11) is fixedly connected to the adjacent V-shaped clamping member. The top of each of the two connecting blocks (11) is fixedly connected to a linkage component, and the movable end of the linkage component is fixedly connected to the adjacent V-shaped clamping member. The four V-shaped clamping members are all provided with self-tapping screws for the test workpiece.

2. The adjustable-size self-tapping screw anti-pull-out clamp device according to claim 1, characterized in that: Each of the four V-shaped clamping components includes a V-shaped clamping block (8), and the four V-shaped clamping blocks (8) are respectively arranged inside the upper clamp (1) and the lower clamp (4), and the connecting block (11) is fixedly connected to the adjacent V-shaped clamping block (8). The two clamping surfaces of the V-shaped clamping block (8) are provided with assembly grooves (7), and the inner walls on both sides of the two assembly grooves (7) are rotatably connected to several rollers (9).

3. The adjustable-size self-tapping screw anti-pull-out clamp device according to claim 2, characterized in that: Both of the guide components include a fixed seat (12), and the two fixed seats (12) are fixedly connected to the upper clamp (1) and the lower clamp (4) respectively. The assembly seat (13) is fixedly connected to the adjacent fixed seat (12). The fixed seat (12) is located on one side of the V-shaped clamp (8) and is fixedly connected to a guide rail (15). The guide rail (15) is slidably connected to the two adjacent V-shaped clamps (8).

4. The adjustable-size self-tapping screw anti-pull-out clamp device according to claim 2, characterized in that: Both of the linkage components include a guide rod (10), and the guide rod (10) is fixedly connected to the top of the adjacent connecting block (11). The outer surface of the guide rod (10) is slidably fitted with a slider (14), and the slider (14) is fixedly connected to the adjacent V-shaped clamp (8).

5. The adjustable-size self-tapping screw anti-pull-out clamp device according to claim 1, characterized in that: The self-tapping screw test workpiece includes a self-tapping screw body (5), and a flat washer (2) is fitted on the outer surface of the self-tapping screw body (5), and the flat washer (2) is located inside the upper clamp (1).

6. The adjustable-size self-tapping screw anti-pull-out clamp device according to claim 5, characterized in that: The outer surface of the self-tapping screw body (5) is threaded with a tension ring (3), and the tension ring (3) is located inside the lower clamp (4).

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