Torque pretightening force auxiliary testing device of microelectronic clamp screw

Abstract

The invention provides a torque pre-tightening force auxiliary testing device for a microelectronic clamp screw, which comprises a bottom plate (1), and is characterized in that a pair of sliding rails (2) is arranged on the bottom plate (1), a connecting plate (3) is bridged between two sliding blocks (2a), a sensor mounting seat (4) is arranged on the bottom plate (1), a sensor (4a) and a mounting seat (8) are arranged on the sensor mounting seat (4), and the sensor (4a) and the mounting seat (8) are arranged on the mounting seat (8). A stress conduction part (6) and a groove plate (7) are arranged on the connecting plate (3), a screw hole plate (9) is arranged on the mounting seat (8), an unthreaded hole plate (10) is arranged on the groove plate (7), and a to-be-tested screw (11) correspondingly matched with the screw hole plate (9) is arranged on the unthreaded hole plate (10) in a penetrating manner. The pre-tightening device is simple in structure and convenient to use, pre-tightening force is vertically conducted to the pressure sensor, and stress loss cannot be generated; the testing device is composed of the metal structural member and the pull and push dynamometer, and is simple in structure and low in cost.

Description

Technical Field

[0001] This invention relates to the field of screw testing technology, specifically to an auxiliary testing device for torque preload of screws in microelectronic fixtures. Background Technology

[0002] In the field of microelectronic component testing, to ensure that components can withstand specific mechanical test strengths, a rigid connection must be established between them and the test platform. This connection is usually achieved using screws, which generate preload through screw engagement and then lock the connection through friction. To ensure the stability of the connection, the screws need to withstand as much preload as possible. This stress can be directly or indirectly transmitted to the component under test, causing structural damage to the component under non-test stresses and severely affecting the accuracy of the test.

[0003] Currently, the application and detection of preload mainly rely on torque control methods (such as torque wrenches), but this method is significantly affected by the coefficient of friction, making it difficult to meet the requirements of high-precision assembly. To improve accuracy, the industry has developed various auxiliary technologies, but these still have the following limitations: 1. Inherent defects of traditional mechanical measurement methods Torque-angle method: requires preset initial torque and precise control of rotation angle, has high requirements for assembly space and operator experience, and cannot monitor preload decay in real time during service life.

[0004] Hydraulic tension method: Although it can directly measure axial force, the equipment is bulky and expensive, and it is only suitable for large structures (such as wind turbine tower flanges), making it difficult to popularize for conventional screw connections.

[0005] Visual indication method: such as smart bolts, which qualitatively indicate preload through color changes, but the accuracy is low (it can only distinguish the threshold range), and the central through hole design weakens the bolt strength, limiting its application scenarios.

[0006] 2. Bottlenecks in the application of electronic measurement technology Strain gauge method: This method requires embedding resistance strain gauges (such as patent CN103616118A) on or inside the bolt surface to calculate the axial force. However, the bonding process is complex, the wires are prone to twisting, and the strain gauges are susceptible to temperature drift and humidity fluctuations, requiring a temperature compensation circuit, which leads to complex structure and increased cost.

[0007] Ultrasonic method: Based on the acoustoelastic effect, it measures the bolt elongation (such as ISO16047 standard), with an accuracy of up to 3%. However, it relies on high-precision probes and calibration equipment, is sensitive to surface roughness, and is not suitable for heterogeneous materials or coated bolts.

[0008] Fiber Bragg grating sensors: Although they have the advantage of resisting electromagnetic interference, they require drilling holes in the center of bolts to embed optical fibers, which damages the original structure and results in high installation and maintenance costs, limiting their use to high-end fields such as aerospace.

[0009] Existing screw torque and preload testing technologies generally suffer from insufficient accuracy, narrow applicability, reliance on auxiliary energy, or structural damage. There is an urgent need for a torque and preload testing device that is simple in structure and highly compatible. Summary of the Invention

[0010] The present invention aims to overcome the shortcomings of the prior art and provide an auxiliary testing device for torque preload of screws in microelectronic fixtures.

[0011] This application provides the following technical solution: A torque preload auxiliary testing device for screws in microelectronic fixtures includes a base plate. The device is characterized by: a pair of slide rails on the base plate, each slide rail having a corresponding sliding block; a connecting plate spanning between the two sliding blocks; a sensor mounting base on one side of the base plate on the connecting plate, with a sensor mounted on the sensor mounting base; a connecting block and a stress-transmitting component corresponding to the sensor on the connecting plate; a grooved plate on the connecting block; a pair of mounting seats on the base plate on one side of the connecting plate; a screw hole plate passing through the groove of the groove plate, with both ends of the screw hole plate connected to the corresponding mounting seats; and a perforated plate at the end of the groove of the groove plate, with a screw to be tested passing through the perforated plate corresponding to the screw hole plate.

[0012] Based on the above technical solutions, the following further technical solutions are also possible: A tapered transmission head is provided on the stress transmission component.

[0013] A set of mounting holes are provided on the base plate, and the mounting holes are stepped holes.

[0014] The sensor is a push-pull force gauge sensor.

[0015] The screw hole axis of the screw plate, the optical hole axis of the optical hole plate, and the center line of the detection end of the stress transmission component are collinear.

[0016] Advantages of the invention: This invention has a simple structure and is easy to use. In the testing device, the pressure sensor and the screw under test are axially collinear, and the preload is transmitted vertically to the pressure sensor without stress loss. The threaded hole of the testing device is detachable and can be replaced with different specifications. The testing device is composed of metal structural parts and a push-pull force gauge, which has a simple structure and low cost. Attached Figure Description

[0017] Figure 1 This is a top view of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 This is a three-dimensional structural schematic diagram of the present invention; Figure 4 yes Figure 3 A partial diagram of the explosion. Detailed Implementation

[0018] like Figure 1-4 As shown, a torque preload auxiliary testing device for microelectronic fixture screws includes a rectangular base plate 1. A pair of slide rails 2 are provided on the base plate 1, and a corresponding sliding block 2a is provided on each slide rail 2. A connecting plate 3 spans between the two sliding blocks 2a and is connected and fixed by detachable screws. A set of stepped mounting holes 1a are evenly distributed on the base plate 1. The base plate 1 can be fixed with screws.

[0019] A sensor mounting base 4 is fixed on the base plate 1 on one side of the connecting plate 3. A sensor 4a is connected to the sensor mounting base 4 by screws. The sensor 4a is a push-pull force gauge sensor.

[0020] A connecting block 5 is connected to the connecting plate 3 by screws. A clearance slot 5a is provided on one side of the connecting block. A stress transmission part 6 is provided in the clearance slot 5a and connected to the connecting plate 3 by screws. A tapered transmission head 6a extends from the stress transmission part 6 and cooperates with the sensor 4a.

[0021] A groove plate 7 is connected to the other side of the connecting block 5 by screws. A mounting base 8 is installed on the bottom plate 1 on both sides of the groove plate 7. A screw hole plate 9 is inserted into the groove of the groove plate 7, and the two ends of the screw hole plate 9 are connected to the corresponding mounting base 8 by detachable screws.

[0022] The light hole plate 10 is connected to the end of the groove of the groove plate 7 by a detachable screw. The screw hole axis of the screw hole plate 9, the light hole axis of the light hole plate 10 and the center line of the conical transmission head 6a of the stress transmission part 6 are collinear.

[0023] A test screw 11 is inserted on the perforated plate 10 and is connected to the screw hole on the screw plate 9.

[0024] Work process: Before testing, lubricating oil should be applied to the slide rail to reduce friction. The screw holes of the screw hole plate 9 should be controlled to maintain production tolerances consistent with the thread hole tolerances of the corresponding microelectronic fixture. The materials of the screw hole plate 9 and the smooth hole plate 10 should be consistent with the material of the microelectronic fixture. Install the sensor 4a on the sensor mounting base and adjust the mounting gap so that it aligns with the screw 11 to be tested.

[0025] During testing, a free-spinning mechanical torque wrench is used. The torque is set, and the screw to be tested is turned until the wrench spins freely. The value of the push-pull force gauge sensor is read. This force value is the preload corresponding to the set torque.

Claims

1. A torque preload auxiliary testing device for microelectronic clamp screws, comprising a base plate (1), characterized in that: A pair of slide rails (2) are provided on the base plate (1), and a corresponding slider (2a) is provided on each slide rail (2). A connecting plate (3) is connected between the two sliders (2a). A sensor mounting seat (4) is provided on the base plate (1) on one side of the connecting plate (3). A sensor (4a) is provided on the sensor mounting seat (4). A connecting block (5) and a stress transmission part (6) corresponding to the sensor (4a) are provided on the connecting plate (3). A groove plate (7) is provided on the connecting block (5). A pair of mounting seats (8) are provided on the base plate (1) on one side of the connecting plate (3). A screw hole plate (9) is provided in the groove of the groove plate (7). The two ends of the screw hole plate (9) are connected to the corresponding mounting seats (8). A light hole plate (10) is provided at the end of the groove of the groove plate (7). A test screw (11) corresponding to the screw hole plate (9) is provided in the light hole plate (10).

2. The torque preload auxiliary testing device for microelectronic clamp screws according to claim 1, characterized in that: A tapered transmission head (6a) is provided on the stress transmission component (6).

3. The torque preload auxiliary testing device for microelectronic clamp screws according to claim 1, characterized in that: A set of fixing holes (1a) are provided on the base plate (1), and the fixing holes (1a) are stepped holes.

4. The torque preload auxiliary testing device for microelectronic clamp screws according to claim 1, characterized in that: The sensor (4a) is a push-pull force gauge sensor.

5. The torque preload auxiliary testing device for microelectronic clamp screws according to claim 1, characterized in that: The screw hole axis of the screw hole plate (9), the optical hole axis of the optical hole plate (10), and the center line of the detection end of the stress transmission component (6) are collinear.

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