Electromagnetic coil end cap riveting strength testing device

Abstract

The present application relates to a kind of electromagnetic coil end cap riveting strength test equipment, including host computer and computer control system, the host computer adopts double-arm structure and double test space;The lower part of the host computer is equipped with a speed regulating system, the speed regulating system includes motor, speed reducer and belt pulley speed reduction system, can complete tensile test, compression test;Double test space is divided into upper space and lower space, wherein the upper space is tensile space, and the lower space is compression space.Motor drives precision screw pair rotation through belt pulley speed reduction system, to drive middle crossbeam to move up and down, and load to sample;The present application adopts the structure of double-arm structure and double test space, distinguishes independent tensile space and compression space, can be compatible with the tensile, compression bidirectional mechanical property test of electromagnetic coil end cap riveting structure, break the limitation of traditional single test space equipment function single, equipment versatility is strong, effectively expand test scene, adapt to riveting strength detection needs under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic coil testing equipment, specifically an electromagnetic coil end cap riveting strength testing device. Background Technology

[0002] After the electromagnetic coil end cap is riveted and assembled, its riveting strength needs to be tested to determine whether the end cap assembly is qualified. Existing testing equipment has a simple structure, mostly a single test space, which cannot simultaneously meet the requirements of tensile and compressive testing. Its testing speed control accuracy, force control accuracy, and displacement resolution are low, and it can only detect mechanical data, unable to identify the failure morphology of the end cap, making it difficult to accurately determine the type of riveting failure. The accuracy and comprehensiveness of the detection are poor, failing to meet the requirements of high-precision, standardized batch testing. Therefore, those skilled in the art provide an electromagnetic coil end cap riveting strength testing device to solve the problems mentioned in the background art. Summary of the Invention

[0003] The purpose of this invention is to provide an electromagnetic coil end cap riveting strength testing device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An electromagnetic coil end cap riveting strength testing device includes a main unit and a computer control system. The main unit adopts a double-arm structure and dual test spaces. A speed control system is installed at the lower part of the main unit, which includes a motor, a reducer, and a pulley reduction system, capable of performing tensile and compression tests. The dual test spaces are divided into an upper space and a lower space, where the upper space is the tensile space and the lower space is the compression space. The motor drives a precision lead screw pair to rotate through the pulley reduction system, thereby driving the middle crossbeam to move up and down to load the sample. The test speed can be controlled by the speed control system installed below the main unit. An upper crossbeam is provided at the upper end of the main unit, and support arms are provided on the left and right sides of the main unit. A middle crossbeam is slidably arranged between the two support arms, and a sensor assembly is provided at the lower end of the middle crossbeam.

[0006] As a further aspect of the present invention: a clamp is provided at the upper end of the middle crossbeam, a base is provided on the clamp, a fixed polyurethane V-shaped block and a movable polyurethane V-shaped block are provided on the base, and the movable polyurethane V-shaped block is located to the left of the fixed polyurethane V-shaped block. A connecting block is provided to the left side of the movable polyurethane V-shaped block, and an internal hexagonal ball head bolt is provided at the left end of the connecting block. The internal hexagonal ball head bolt passes through the left end of the base and is threadedly connected to the base, and the right end of the internal hexagonal ball head bolt is embedded in the interior of the connecting block.

[0007] As a further embodiment of the present invention: a light hole is provided in the connecting block, and a ball head is provided at the right end of the internal hexagonal ball head bolt; a connecting clamp is provided at the lower end of the upper crossbeam, and a force-applying mandrel is provided at the lower end of the connecting clamp, and an expansion sleeve is sleeved on the force-applying mandrel.

[0008] As a further embodiment of the present invention: the lower ends of both sides of the expansion sleeve are provided with stop bosses, the expansion sleeve is provided with an inner conical hole, an axial groove is provided in the inner conical hole, and the upper end of the expansion sleeve is provided with an internal thread; the force-applying mandrel is provided with a conical surface near the lower half, the upper end of the force-applying mandrel is provided with an external thread, and the lower end of the force-applying mandrel is provided with a limit boss.

[0009] As a further aspect of the present invention: the computer control system consists of a speed regulation system and a display and measurement system, employing an AC servo motor, and controlling the forward and reverse rotation and speed accuracy of the AC motor through the speed regulation system. The load measurement system consists of a high-precision load sensor, a measuring amplifier, an A / D converter, a regulated power supply, etc. The displacement measurement system consists of a photoelectric encoder, a pulse width shaping circuit, a frequency multiplier circuit, and a counting circuit. All control parameters and measurement results can be displayed on the screen in real time.

[0010] As a further aspect of the invention: the sensor assembly employs a highly stable spoke-type tension / compression sensor. The upper end of the sensor is fixedly mounted at the lower center of the moving crossbeam of the machine, and the lower end of the sensor is directly connected in series to transmit electrical signals to the computer control system. The test force is applied entirely to the sensor by the crossbeam and then transmitted to the computer control system.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] This invention adopts a double-arm structure and a double test space structure, distinguishing between independent tensile and compression spaces. It is compatible with tensile and compression bidirectional mechanical property testing of electromagnetic coil end cap riveting structures, breaking the limitation of the single function of traditional single test space equipment. The equipment has strong versatility, effectively expands the test scenarios, and adapts to the riveting strength testing needs under different working conditions.

[0013] This invention employs a polyurethane V-shaped adjustable clamp combined with a special expansion sleeve and a force-applying mandrel, which can adaptively clamp coil assemblies of different specifications. The flexible clamping structure will not damage the coil shell and end cap structure. At the same time, through the limiting structure of conical surface mating, limiting boss and stop boss, the test force is uniform and the positioning is accurate, avoiding the detection error caused by sample displacement and uneven force during the test, and improving the test stability and repeatability.

[0014] This invention integrates an industrial camera vision inspection system, equipped with an adjustable dedicated light source, a column-clamped universal micro-adjustment bracket, and dual-trigger shooting logic. It can clearly capture the morphology of end cap failure and damage, and achieve intelligent determination of damage mode through image feature vector similarity matching, thus changing the shortcomings of traditional equipment that can only detect mechanical data and cannot identify failure types. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a device for testing the riveting strength of an electromagnetic coil end cap.

[0016] Figure 2 This is a schematic diagram of the fixture in an electromagnetic coil end cap riveting strength testing device.

[0017] Figure 3 This is a schematic diagram of the expansion sleeve in an electromagnetic coil end cap riveting strength testing device.

[0018] Figure 4 This is a schematic diagram of the force-applying mandrel in an electromagnetic coil end cap riveting strength testing device.

[0019] Figure 5 This is a schematic diagram of the internal hexagonal ball head bolt used in an electromagnetic coil end cap riveting strength testing device.

[0020] Figure 6 This is a load-displacement curve for testing the assembly of an electromagnetic coil end cap using a riveting strength testing device.

[0021] Figure 7 This is a sequence diagram of the working process of an electromagnetic coil end cap riveting strength testing device.

[0022] In the diagram: 1-base, 2-fixed polyurethane V-block, 3-movable polyurethane V-block, 8-coil housing, 9-end cap, 10-connecting clamp, 11-upper crossbeam, 12-sensor assembly, 13-speed control system; 14-middle crossbeam;

[0023] 4-Connecting block, 41-Smooth hole, 5-Internal hexagonal ball head bolt, 51-Ball head;

[0024] 6-Expansion sleeve, 61-Axial groove, 62-Internal tapered hole, 63-Internal thread, 64-Stop boss;

[0025] 7-Force-applying mandrel, 71-External thread, 72-Conical surface, 73-Limiting boss; Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-7 In this embodiment of the invention, an electromagnetic coil end cap riveting strength testing device includes a main unit and a computer control system located on the right side of the main unit. The main unit adopts a double-arm structure and a double test space.

[0028] The lower part of the host is equipped with a speed regulation system 13, which includes a motor, a reducer and a pulley reduction system, and can perform tensile and compression tests.

[0029] The dual test space is divided into an upper space and a lower space, with the upper space being the tensile space and the lower space being the compression space. A motor drives a precision lead screw to rotate via a belt-driven reduction system, thereby moving the middle crossbeam 14 up and down to load the sample. The test speed can be controlled by a speed control system 13 installed below the main unit.

[0030] The upper end of the host is provided with an upper crossbeam 11, and the left and right sides of the host are provided with support arms. A middle crossbeam 14 is slidably arranged between the two support arms, and a sensor assembly 12 is provided at the lower end of the middle crossbeam 14.

[0031] A clamp is provided at the upper end of the middle crossbeam 14, and a base 1 is provided on the clamp. A fixed polyurethane V-block 2 and a movable polyurethane V-block 3 are provided on the base 1, and the movable polyurethane V-block 3 is located to the left of the fixed polyurethane V-block 2. A connecting block 4 is provided to the left of the movable polyurethane V-block 3. An internal hexagonal ball head bolt 5 is provided at the left end of the connecting block 4, and the internal hexagonal ball head bolt 5 passes through the left end of the base 1 and is threadedly connected to the base 1. The right end of the internal hexagonal ball head bolt 5 is embedded in the interior of the connecting block 4.

[0032] The connecting block 4 is provided with a light hole 41, and the right end of the internal hexagonal ball head bolt 5 is provided with a ball head 51;

[0033] The lower end of the upper crossbeam 11 is provided with a connecting clamp 10, the lower end of the connecting clamp 10 is provided with a force-applying mandrel 7, and an expansion sleeve 6 is sleeved on the force-applying mandrel 7.

[0034] The expansion sleeve 6 has a stop boss 64 at the lower ends on both sides, an inner conical hole 62 is provided inside the expansion sleeve 6, an axial groove 61 is provided inside the inner conical hole 62, and an internal thread 63 is provided at the upper end inside the expansion sleeve 6.

[0035] The force-applying mandrel 7 has a tapered surface 72 near its lower half, an external thread 71 at its upper end, and a limiting boss 73 at its lower end.

[0036] The computer control system consists of a speed control system and a display and measurement system. It employs an AC servo motor, and the speed control system manages the motor's forward and reverse rotation and speed accuracy. The load measurement system comprises a high-precision load sensor, a measuring amplifier, an A / D converter, and a regulated power supply. The displacement measurement system consists of a photoelectric encoder, a pulse width shaping circuit, a frequency multiplier circuit, and a counting circuit. All control parameters and measurement results can be displayed on the screen in real time.

[0037] The sensor assembly 12 employs a highly stable spoke-type tension / compression sensor. The upper end of the sensor is fixedly mounted at the lower center of the moving crossbeam of the machine, and the lower end of the sensor is directly connected in series to transmit electrical signals to the computer control system. The test force is applied entirely to the sensor by the crossbeam and then transmitted to the computer control system.

[0038] An industrial camera is mounted on the front column of the main unit. The industrial camera is fixed to the front column by a column-clamping universal micro-adjustment bracket and a U-shaped clamp. The industrial camera is a Hikvision MV-CA050-12GC with a lens parameter of Hikvision MVL-MF1628M-8MP (16mm focal length).

[0039] Light source type: High-brightness white ring LED light source or low-angle ring light, used to suppress the specular reflection on the surface of the metal end cap.

[0040] Specifications: Outer diameter 60-80mm (inner diameter needs to be matched with lens), beam angle 45°-60°, oblique beam effect is best.

[0041] Control method: Equipped with an external PWM controller (24VDC power supply), it supports stepless brightness adjustment from 0-100%.

[0042] The column-mounted, clamp-type universal fine-tuning bracket has an adjustable cantilever length of 150-300mm, enabling three-axis rotation and fine-tuning when used with a damped universal ball head. Vibration protection utilizes a structure with nitrile rubber damping sheets applied to the clamp contact surfaces, and a transparent PC dust cover is installed at the front of the lens. Shooting trigger conditions:

[0043] Soft triggering: The test machine control software sends commands via the GigE protocol, which is suitable for low-speed steady-state observation.

[0044] Hard trigger wiring: Use Line 0 (optically isolated input) of the camera's 6-pin Hirose interface to connect to the output terminal of the electrical control cabinet.

[0045] Triggering logic: When the testing machine is loaded and started, it outputs a rising edge signal to trigger recording; when the load drops to 80% of the peak value and failure is determined, the control system outputs a stop signal, and the camera uses the onboard buffer to save the image sequence before and after the failure.

[0046] Parameters of the electromagnetic coil end cap riveting strength testing equipment: key design parameters such as loading speed range, maximum stroke, force control accuracy, and displacement resolution.

[0047] Maximum test force: 30kN (approximately 3 tons);

[0048] Loading speed range: 0.01~500mm / min;

[0049] Maximum stroke (effective stretching / compression space): 600mm~700mm; Force control accuracy: 0.5 grade; Accuracy: better than ±0.5%;

[0050] Displacement resolution: 0.001 mm;

[0051] During operation, place the coil assembly between the movable polyurethane V-block 3 and the fixed polyurethane V-block 2, tighten the hexagonal head bolt 5, clamp the coil housing 8, insert the force-applying spindle 7 into the expansion sleeve 6 from the bottom, then insert the expansion sleeve 6 into the inner hole of the end cover 9, and tighten the force-applying spindle 7 until it reaches its travel limit. At this point, the limiting boss 73 just reaches the lower end face of the expansion sleeve 6, and the stop boss 64 is pulled up to the inner end face of the end cover. Start the equipment, and the upper crossbeam 11 pulls the force-applying spindle 7 upward, applying a tensile force to the end cover 9 through the expansion sleeve 6. Record the maximum tensile force value at failure.

[0052] The judgment unit determines whether the coil end cap assembly is qualified based on: collecting the real-time tensile force value F(t) output by the load sensor and the displacement value S(t) output by the displacement sensor during the pulling process, and plotting the load-displacement curve; it is judged as qualified when all of the following conditions are met:

[0053] 1. The measured ultimate pull-out force Fmax ≥ the preset qualified threshold [100N];

[0054] 2. The load-displacement curve shows a continuous monotonically increasing trend before reaching Fmax, without obvious plateaus or sharp drops.

[0055] 3. After being subjected to force, the pull-out displacement Smax ≥ the maximum allowable displacement [7mm];

[0056] If any condition is not met, the result is deemed unqualified (NG).

[0057] The camera captures changes in the morphology of the damaged area, builds a dataset, and uses matching to identify whether damage has occurred during detection.

[0058] After pull failure, an industrial camera is activated to acquire images of the damage morphology at the separation interface of the coil end cap, obtaining images of the damage morphology. A pre-established qualified damage morphology feature dataset (containing image feature vectors of adhesive layer cohesive damage morphology and metal matrix tearing morphology) is loaded into the image matching module. The feature vectors of the currently acquired damage morphology image are extracted and matched with the samples in the dataset for similarity. When the matching similarity is ≥ the preset threshold (85%), it is determined to be a valid cohesive damage mode and recorded as a qualified damage morphology. When the matching similarity is lower than the threshold or atypical damage morphologies such as interface debonding, delamination, and missing adhesive are identified, the damage morphology is marked as abnormal and an alarm is triggered.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for testing the riveting strength of an electromagnetic coil end cap, characterized in that, It includes a host computer and a computer control system, wherein the host computer adopts a dual-arm structure and dual test spaces; The lower part of the host is equipped with a speed regulation system (13), which includes a motor, a reducer and a belt pulley reduction system, and can perform tensile and compression tests. The dual test space is divided into an upper space and a lower space, where the upper space is the tensile space and the lower space is the compression space. The motor drives the precision lead screw to rotate through the belt pulley reduction system, thereby driving the middle crossbeam (14) to move up and down to load the sample. The test speed can be controlled by the speed regulation system (13) installed under the main unit.

2. The electromagnetic coil end cap riveting strength testing device according to claim 1, characterized in that, The host is provided with an upper crossbeam (11) at the upper end, and support arms are provided on the left and right sides of the host. A middle crossbeam (14) is slidably provided between the two support arms, and a sensor assembly (12) is provided at the lower end of the middle crossbeam (14).

3. The electromagnetic coil end cap riveting strength testing device according to claim 2, characterized in that, A clamp is provided on the upper end of the middle crossbeam (14), and a base (1) is provided on the clamp. A fixed polyurethane V-block (2) and a movable polyurethane V-block (3) are provided on the base (1). The movable polyurethane V-block (3) is located to the left of the fixed polyurethane V-block (2). A connecting block (4) is provided to the left of the movable polyurethane V-block (3). An internal hexagonal ball head bolt (5) is provided at the left end of the connecting block (4). The internal hexagonal ball head bolt (5) passes through the left end of the base (1) and is threaded to the base (1). The right end of the internal hexagonal ball head bolt (5) is embedded in the interior of the connecting block (4).

4. The electromagnetic coil end cap riveting strength testing device according to claim 3, characterized in that, The connecting block (4) is provided with a light hole (41), and the right end of the internal hexagonal ball head bolt (5) is provided with a ball head (51).

5. The electromagnetic coil end cap riveting strength testing device according to claim 2, characterized in that, The lower end of the upper crossbeam (11) is provided with a connecting clamp (10), the lower end of the connecting clamp (10) is provided with a force-applying mandrel (7), and an expansion sleeve (6) is sleeved on the force-applying mandrel (7).

6. The electromagnetic coil end cap riveting strength testing device according to claim 5, characterized in that, The expansion sleeve (6) has a stop boss (64) at the lower end on both sides, an inner conical hole (62) is provided inside the expansion sleeve (6), an axial groove (61) is provided inside the inner conical hole (62), and an internal thread (63) is provided at the upper end inside the expansion sleeve (6).

7. The electromagnetic coil end cap riveting strength testing device according to claim 5, characterized in that, The force-applying mandrel (7) has a tapered surface (72) near its lower half, an external thread (71) is provided at the upper end of the force-applying mandrel (7), and a limiting boss (73) is provided at the lower end of the force-applying mandrel (7).

8. The electromagnetic coil end cap riveting strength testing device according to claim 1, characterized in that, The computer control system consists of a speed regulation system and a display and measurement system. It uses an AC servo motor and controls the forward and reverse rotation and speed accuracy of the AC motor through the speed regulation system.

9. The electromagnetic coil end cap riveting strength testing device according to claim 1, characterized in that, The sensor assembly (12) adopts a high-stability spoke-type tension and compression sensor. The upper end of the sensor is fixedly installed at the lower center of the crossbeam of the moving machine, and the lower end of the sensor is directly connected in series to transmit electrical signals to the computer control system.

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