A force measuring device

Abstract

The force measuring device consists of a probe (needle probe and hole probe), a push rod, a front sleeve, an adapter sleeve, a spring, an intermediate sleeve, an adjusting sleeve, a battery, a wiring plug, a buzzer, screws, contact springs, heat shrink tubing, a tail sleeve, and a set screw. The probe and push rod are connected by threads, the front sleeve and intermediate sleeve are connected by threads at both ends of the adapter sleeve, and the intermediate sleeve and tail sleeve are connected by threads. A spring is mounted on the push rod. The adjusting sleeve is connected to the intermediate sleeve by threads. The contact spring is mounted in the side groove of the outer circumference of the adjusting sleeve. The battery is fixed in the adjusting sleeve by the wiring plug. The positive wire of the buzzer is welded to the contact spring for conductivity, and the negative wire of the buzzer is tightened to the wiring plug by a screw for conductivity. This device controls the magnitude of the axial force applied to the positioning claw by limiting the spring stroke and has an audible alarm function. Using this device can solve the problems of difficulty in controlling the axial force applied along the longitudinal axis of the contact element during positioning claw holding force detection, and the easy over- or under-voltage issues.

Description

Technical Field

[0001] This utility model relates to a force measuring device, which is mainly used to test the holding force of the positioning claws of a loose electrical connector after crimping. Background Technology

[0002] Electrical connectors are crucial components for electrical signal transmission, widely used in aerospace, aviation, electronics, power, and communications fields. Crimped loose-type electrical connectors, however, are shipped with their contacts not installed within the insulator, but rather packaged separately. Each contact hole in the product is equipped with a positioning claw. This component's function is to hold and position the pins or sockets correctly within the insulator. Therefore, the effectiveness of the positioning claw is a critical performance indicator determining the electrical contact reliability of the crimped loose-type electrical connector. As a thin-walled elastic component, the positioning claw is difficult to control during production. There is a risk of deformation due to stress during part forming, heat treatment, surface treatment, assembly, and inter-process handling. Deformed parts are not easily visually detected and removed after being installed in the insulator. If the effectiveness of the positioning claw is not 100% verified before the product leaves the factory, products with malfunctioning positioning claws may be shipped, posing a risk to product quality. Summary of the Invention

[0003] This utility model provides a force measuring device for testing the holding force of the positioning claws of a crimped loose electrical connector. The device is simple in structure, highly operable, and easy to use. It controls the magnitude of the axial force applied to the positioning claws along the longitudinal axis of the contact by limiting the spring stroke, and has an audible alarm function when the force value reaches the required value.

[0004] The technical solution adopted by this utility model is as follows: a force measuring device, which includes a probe (needle probe and hole probe), a push rod, a front sleeve, an adapter sleeve, a spring, an intermediate sleeve, an adjusting sleeve, a battery, a wiring plug, a buzzer, a screw, a contact spring, a heat shrink tubing, a tail sleeve, and a set screw. The probe and the push rod are fastened together by threads. The front sleeve and the intermediate sleeve are fastened together by threads at both ends of the adapter sleeve. The intermediate sleeve and the tail sleeve are fastened together by threads. A spring is mounted on the push rod. The adjusting sleeve and the intermediate sleeve are fastened together by threads. The contact spring is mounted in the side groove of the outer circle of the adjusting sleeve. The battery is pressed and fixed in the adjusting sleeve by the wiring plug. The positive wire of the buzzer is connected to the contact spring by welding. The negative wire of the buzzer is connected to the wiring plug by screw pressing.

[0005] Based on the above, the probe is divided into a needle probe and a hole probe. The front end of the needle probe is provided with an inner hole for pressing when the product being tested is a needle-type contact body. The front end of the hole probe is provided with a steel needle for pressing when the product being tested is a hole-type contact body. The other end of the probe is provided with an external thread for connecting and cooperating with a push rod.

[0006] Based on the above, the push rod is a stepped shaft part with two positioning shoulders, one for engaging with the stepped surface of the inner hole of the front sleeve, and the other for positioning the end face of the spring.

[0007] Based on the above, the front end of the push rod is provided with a threaded hole for connecting and engaging with the external thread of the needle probe or the hole probe.

[0008] Based on the above, a spring is fitted on the outer circle of the push rod tail end, and the spring can stretch and deform elastically along the push rod axis.

[0009] Based on the above, the front sleeve is a cylindrical structure with an inner stepped surface at the front end for mating with the shoulder surface of the push rod shaft, and an internal thread at the other end for connecting with the external thread of the adapter sleeve.

[0010] Based on the above, the adapter sleeve is a hollow stepped shaft part with two positioning shoulders and external threads at both ends, which are used to connect and mate with the external threads at the tail end of the front sleeve and the front end of the middle sleeve, respectively.

[0011] Based on the above, the tail end of the adapter sleeve is provided with an inner stepped surface for positioning the spring end face.

[0012] Based on the above, the front end of the front sleeve and the tail end of the adapter sleeve are respectively provided with guide holes that mate with the outer circles of both ends of the push rod, for circumferential positioning of the axial movement of the push rod.

[0013] Based on the above, the front sleeve has a radial set screw hole in its internal thread. After the front sleeve and the adapter sleeve are connected in place by threads, the end face of the front sleeve is close to the stepped surface of the adapter sleeve, and the internal spring is under slight pressure (compression amount of about 0.2mm). Then tighten the set screw to fix and prevent loosening.

[0014] Based on the above, the intermediate sleeve is a cylindrical structure with internal threads at both ends for connecting and engaging with the external threads at the tail end of the adapter sleeve and the front end of the adjusting sleeve, respectively.

[0015] Based on the above, the tail end of the intermediate sleeve is provided with an external thread for connection and engagement with the internal thread at the front end of the tail sleeve.

[0016] Based on the above, the intermediate sleeve has radial set screw holes on its internal threads at both ends, which are used to fix and prevent loosening after being connected to the external threads of the adapter sleeve and the adjusting sleeve. The end face of the intermediate sleeve should be in close contact with the stepped surface of the adapter sleeve, and the threaded connection position of the intermediate sleeve and the adjusting sleeve should be adjusted according to the force value requirement of the holding force of the positioning claw to be measured.

[0017] Based on the above, the adjusting sleeve has a cylindrical structure and is made of polysulfone material, which is insulating and has good machinability.

[0018] Based on the above, the front end of the adjusting sleeve is provided with a stepped hole, which mates with the boss of the positive electrode of the standard battery. The depth of the stepped hole is shallower than the height of the boss of the positive electrode of the battery, so as to ensure that the positive electrode of the battery is exposed on the end face of the adjusting sleeve after assembly.

[0019] Based on the above, the front end of the adjusting sleeve is provided with an external thread for connecting and engaging with the internal thread of the intermediate sleeve, and the engagement position is adjusted according to the force value requirement of the holding force of the positioning claw to be measured.

[0020] Based on the above, the adjusting sleeve is provided with an internal thread near its tail end for connection and engagement with the external thread of the wiring plug.

[0021] Based on the above, the outer circle of the adjusting sleeve is provided with a rectangular axial through groove, the width of which matches the width of the contact spring, and the depth is greater than the thickness of the contact spring.

[0022] Based on the above, a rectangular radial groove is provided on the outer circle of the tail end of the adjusting sleeve for the positive lead wire of the buzzer to exit.

[0023] Based on the above, the wiring plug is a solid plug structure and the material is a conductive material.

[0024] Based on the above, the wiring plug is provided with an external thread for connection and engagement with the internal thread of the adjusting sleeve.

[0025] Based on the above, the front end of the connector screw is provided with a boss, the diameter of which is smaller than the metal end face size of the battery negative electrode, so as to ensure effective contact and conduction between the connector screw and the battery negative electrode.

[0026] Based on the above, the end of the wiring plug is provided with a slot for rotating threaded connection.

[0027] Based on the above, the terminal of the wiring plug is provided with a screw hole for pressing the negative wire of the buzzer to achieve conduction with the buzzer.

[0028] Based on the above, the buzzer is a standard outsourced component used for a short-circuit sound alarm when the push rod or spring reaches its full travel position, and has positive and negative wires.

[0029] Based on the above, the contact spring is formed by bending a copper alloy strip that is conductive and has good elasticity.

[0030] Based on the above, the fixed end of the contact spring is welded to the positive wire of the buzzer to achieve conductivity, and the free end achieves contact with the positive terminal of the battery exposed on the end face of the adjusting sleeve through the displacement of the push rod.

[0031] Based on the above, the tail sleeve has a cylindrical structure and an internal thread near the front end for connection and mating with the external thread of the intermediate sleeve.

[0032] Based on the above, the tail sleeve is provided with two stepped holes at its tail end for fitting and positioning with the outer circle and end face of the buzzer.

[0033] Based on the above, the tail sleeve is provided with a through hole at its tail end for the propagation of the buzzer alarm sound.

[0034] The beneficial effects of this utility model are: by limiting the stroke of the push rod, the magnitude of the axial force borne by the positioning claw is controlled, and an alarm function is provided when the set value is reached; the force measuring device of this utility model can solve the problem of overpressure or underpressure that is easy to occur when detecting the holding force of the positioning claw, improve the detection accuracy, and ensure product quality. Attached Figure Description

[0035] Figure 1 This is a cross-sectional structural schematic diagram of the force measuring device of this utility model;

[0036] Figure 1 In the middle: 1. Needle probe, 2. Hole probe, 3. Push rod, 4. Front sleeve, 5. Adapter sleeve, 6. Spring, 7. Intermediate sleeve, 8. Adjusting sleeve, 9. Battery, 10. Wiring plug, 11. Buzzer, 12. Screw, 13. Heat shrink tubing, 14. Contact spring, 15. Tail sleeve, 16. Set screw. Detailed Implementation

[0037] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0038] like Figure 1As shown, insert the large outer diameter of the push rod (3) into the smallest inner hole of the front sleeve (4) through the inner thread end. Install the spring (6) on the tail end of the push rod (3) to keep the shoulder of the push rod (3) close to the stepped surface of the inner hole of the front sleeve (4). Then, assemble the adapter sleeve (5) with its smallest inner hole end facing outwards. The internal spring (6) is in a compressed state. Tighten the set screw (16) to prevent loosening. After the positive terminal of the battery (9) is inserted from the large inner hole end of the adjusting sleeve (8), the negative wire of the buzzer (11) is pressed into the tail end of the wiring plug (10) using the screw (12). Use the slot at the tail end of the wiring plug (10) to screw it into the threaded hole at the tail end of the adjusting sleeve (8) until the battery (9) is pressed. Straighten the positive wire of the buzzer (11) and throw it out from the radial side groove of the adjusting sleeve (8) and weld it to the fixed end of the contact spring (14). Then install the welded contact spring (14). In the axial through groove of the adjusting sleeve (8), heat shrink tubing (13) is fitted onto the adjusting sleeve (8). The front end of the heat shrink tubing (13) is pushed to the step at the tail end of the external thread of the adjusting sleeve (8). The free end of the contact spring (14) is adjusted and kept in a position that can contact the positive terminal of the battery (9). The position of the heat shrink tubing (13) is adjusted so that it can cover the welding point of the fixed end of the contact spring (14) before heat shrinking. Finally, the buzzer (11) wire is straightened and pushed into the tail end hole of the adjusting sleeve (8). After assembling the intermediate sleeve (7) with the non-external thread facing forward and the adapter sleeve (5) in place, tighten the set screw (16) to prevent loosening. Then, insert the adjusting sleeve (8) into the intermediate sleeve (7) with the external thread facing forward. Adjust the installation position of the adjusting sleeve (8) according to the positioning claw holding force value required by the product. Specifically, use the end face of the push rod (3) to press against the push-pull force gauge. When the push-pull force count value, i.e. the spring (6) compression force, reaches the positioning claw holding force value required by the product, tighten the adjusting sleeve (8) until the push rod (3) presses against the contact spring (14) and the free end of the contact spring (14) to contact the positive terminal of the battery. At this time, the buzzer connects with the battery and emits an alarm sound. After adjusting the installation position of the adjusting sleeve (8), tighten the set screw (16) to prevent loosening, and then install the tail sleeve (15). Finally, depending on the type of product contact, a pin probe (1) or a hole probe (2) is selected and installed at the front end of the push rod, so that the force measuring device of this utility model can complete the test of the holding force of the positioning claw of the loose electrical connector after crimping.

Claims

1. A force measuring device, characterized in that: The device includes a probe—a needle probe and a hole probe, a push rod, a front sleeve, an adapter sleeve, a spring, an intermediate sleeve, an adjusting sleeve, a battery, a wiring plug, a buzzer, screws, contact springs, heat shrink tubing, a tail sleeve, and a set screw. The front sleeve and the intermediate sleeve are fastened together by threads at both ends of the adapter sleeve, and the intermediate sleeve and the tail sleeve are fastened together by threads. The push rod is equipped with a spring, and the adjusting sleeve is fastened together with the intermediate sleeve by threads. The contact spring is assembled in the side groove of the outer circle of the adjusting sleeve. The battery is pressed and fixed in the adjusting sleeve by the wiring plug. The positive wire of the buzzer is connected to the contact spring by welding, and the negative wire of the buzzer is connected to the wiring plug by screws.

2. The force measuring device according to claim 1, characterized in that: The probe is divided into a needle probe and a hole probe. The front end of the needle probe is provided with an inner hole for pressing when the product being tested is a needle-type contact body. The front end of the hole probe is provided with a steel needle for pressing when the product being tested is a hole-type contact body. The other end of the probe is provided with an external thread for connecting and cooperating with the push rod.

3. The force measuring device according to claim 1, characterized in that: A spring is fitted on the outer circumference of the push rod tail end, and the spring can stretch and deform elastically along the push rod axis.

4. The force measuring device according to claim 1, characterized in that: The adjusting sleeve has a cylindrical structure and is made of polysulfone, which is insulating and has good machinability. A stepped hole is provided at the front end, which mates with the boss of the positive electrode of a standard battery. The depth of the stepped hole is shallower than the height of the positive electrode boss to ensure that the positive electrode of the battery protrudes from the end face of the adjusting sleeve after assembly. An external thread is provided at the front end for connection with the internal thread of the intermediate sleeve, and the mating position is adjusted according to the force required by the holding force of the positioning claw. An internal thread is provided near the tail end for connection with the external thread of the wiring plug. A rectangular axial groove is provided on the outer circumference, the width of which matches the width of the contact spring, and the depth is greater than the thickness of the contact spring. A rectangular radial groove is provided on the outer circumference of the tail end for the exit of the buzzer's positive electrode wire.

5. The force measuring device according to claim 1, characterized in that: The wiring plug is a solid plug structure made of conductive material, with external threads for connection and mating with the internal threads of the adjusting sleeve; a boss is provided at the front end, the diameter of which is smaller than the metal end face of the battery negative terminal to ensure effective contact and conduction between the wiring plug and the battery negative terminal; a screw hole is provided at the rear end for pressing the buzzer negative terminal wire to achieve conduction with the buzzer.

6. The force measuring device according to claim 1, characterized in that: The contact spring is formed by bending a conductive and elastic copper alloy strip. The fixed end is welded to the positive wire of the buzzer to achieve conductivity, and the free end is connected to the positive terminal of the battery exposed on the end face of the adjusting sleeve by the displacement of the push rod.

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