CN107782470B

CN107782470B - Clamp clamping force measuring device

Info

Publication number: CN107782470B
Application number: CN201711225108.0A
Authority: CN
Inventors: 周金枝; 钟楚珩; 周陈旭; 何琦龙; 李厚民; 张利然
Original assignee: Hubei University of Technology
Current assignee: Hubei University of Technology
Priority date: 2017-11-29
Filing date: 2017-11-29
Publication date: 2023-12-15
Anticipated expiration: 2037-11-29
Also published as: CN107782470A

Abstract

The invention relates to a clamping force measuring device for a fastener clamp, which belongs to the technical field of force measuring equipment, and provides a clamping force measuring device for the clamp, which has a simple structure and convenient use, and can detect the radial pressure distribution rule of the clamp in the circumferential direction when the clamp is clamped.

Description

Clamp clamping force measuring device

Technical Field

The invention relates to a clamp clamping force measuring device, and belongs to the technical field of force measuring equipment.

Background

In construction machines, automobiles or other machinery that require the transfer of fluid media, low pressure lines are often connected to hard pipes (steel pipes, etc.) using hoses (rubber pipes, etc.), which are very common. In order to ensure a firm and reliable seal between the hose and the hard tube, clamps are often used to lock the hose to the hard tube. The clamp connection is widely applied to the fields of automobile pipeline connection, gas pipeline, oil circuit and the like, is a preferred mode of connecting a hose and a hard pipe, and has the advantages of simplicity in operation, reliability in sealing and the like.

At present, the clamp products in domestic markets are relatively large in quantity and uneven in variety, and consumers often neglect the quality of the clamp when purchasing the clamp, only pay attention to the price, so that potential safety hazards are left. The clamp which looks small but plays a great role, once the clamp connection fails, the sealing is problematic, the work of the whole system is affected, and even serious safety accidents are caused. The edge is smooth without damaging the connected hose, the hose has 360-degree continuous and reliable sealing, and the clamp with simple and quick operation can be widely applied. But there are the following difficulties in the actual performance analysis: the clamp is a stamping part, the shape of the clamp is very irregular, and complex plastic deformation can occur in the clamping process, so that the analysis is inconvenient; the clamp can slide relatively and deform greatly during clamping, and the nonlinear state makes theoretical calculation very difficult; the application environment of the clamp is complex, and the clamping force, the hose material, the hose diameter and the like are uncertain, so that a force measuring device capable of analyzing the clamping process of the clamp to obtain the ultimate bearing capacity and the sealing pressure of the clamp is urgently needed to be developed.

Disclosure of Invention

In order to solve the technical problems in the prior art, the clamp clamping force measuring device is simple in structure and convenient to use, and radial pressure during clamping of the clamp can be detected to be distributed regularly along the circumferential direction.

In order to achieve the above purpose, the technical scheme adopted by the invention is a clamp clamping force measuring device, which comprises a measuring head used for placing a tested clamp, wherein the measuring head comprises a plurality of circularly distributed cantilever beams, the cantilever beams are fixed on a circular base, the free ends of the cantilever beams are connected with clamping jaws used for placing the tested clamp, strain gages are stuck in the roots of the cantilever beams, the circular base of the measuring head is stuck with temperature compensation gages, the strain gages, the temperature compensation gages and the strain gages are controlled by a computer, deformation of the cantilever beams generated during clamping of the clamp is detected by an electrical measurement method, strain information is transmitted to the computer, and the computer converts and outputs radial pressure during clamping of the clamp to distribute radar images along the circumferential direction.

Preferably, the force measuring head mainly comprises circular base, cantilever beam and jack catch, circular base's center is provided with through wires hole and fixed slot, is fixed with a plurality of cantilever beams along circumferencial direction evenly distributed on the circular base, all installs the jack catch of placing the clamp of being surveyed on every cantilever beam, the jack catch passes through two-way locating pin to be fixed at the free end of cantilever beam, the jack catch cross-section is the fan shape, and the outside arc line of jack catch constitutes a complete circle.

Preferably, the cross section of cantilever beam is fan-shaped, and the free end is provided with the ladder groove that is used for fixed jack catch, be provided with the locating hole on the ladder groove, the stiff end bottom of jack catch is provided with the draw-in groove with ladder groove complex, be provided with the locating hole on the draw-in groove, two locating holes set up with one heart, the free end top of jack catch is provided with fan-shaped dog of placing the measured clamp.

Preferably, the number of the cantilever beams is 8.

Compared with the prior art, the invention has the following technical effects: the invention has simple structure and convenient use, adopts the structure that a plurality of cantilever beams are arranged on a circular base, generates deformation under the action of clamping force of the clamp, then outputs acting force on each cantilever beam by utilizing an electrical measurement principle, has convenient detection and can accurately detect and analyze the ultimate bearing capacity and sealing pressure of the clamp; and the force measuring head adopts a split type structure, and can be replaced according to the hoops with different diameters.

Drawings

Fig. 1 is a control schematic block diagram of the present invention.

FIG. 2 is a schematic diagram of a force-measuring head according to the present invention.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a schematic structural view of a cantilever beam according to the present invention.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a schematic structural view of the claw in the present invention.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1 to 3, the clamp clamping force measuring device comprises a measuring head 1 for placing a tested clamp, the measuring head 1 comprises a plurality of cantilever beams 2 uniformly distributed along the circumferential direction, strain gauges 3 are stuck in the cantilever beams 2, temperature compensation plates 4 are stuck at the bottom of the measuring head 1, the strain gauges 3 and the temperature compensation plates 4 are connected with a computer 6 through strain gauges 5, the cantilever beams 2 are stressed and deformed during clamping, the strain gauges 3 are used for detecting the strain of the cantilever beams, and the computer 6 acquires the strain of the cantilever beams in real time through controlling the strain gauges 5.

In the invention, because clamping forces of the clamp are distributed along the circumferential direction, the directions of the clamping forces are all directed towards the circle center, and it is not practical to accurately measure the pressure of each point, the clamp can be uniformly divided into eight sections along the circumferential direction, and the forces of each section in the radial direction are measured, so that the clamping performance of the clamp is predicted. During measurement, the clamp is sleeved on a stop block of the clamp to be measured, when the clamp is clamped, the cantilever beam is stressed to deform, the strain gauge detects the strain of the cantilever beam, the strain gauge internally comprises a signal conditioning circuit and an A/D conversion circuit, the acquired analog signals are converted into digital signals, the digital signals are sent into a computer, and the data are processed by programming software. The computer then passes the results through a D/a conversion to simulate an output, such as a waveform display. The results may also be digitally output, such as printed, via digital I/O. In order to eliminate errors caused by temperature, a strain gauge is attached to a groove at the bottommost surface of the force measuring head and used as a temperature compensation plate, so that measurement accuracy is improved.

As shown in fig. 2 to 6, the force measuring head 1 mainly comprises a circular base 8, cantilever beams 2 and clamping claws 9, a threading hole 10 and a fixing groove 11 are formed in the center of the circular base 8, the fixing groove is used for fixing a temperature compensation sheet, a plurality of cantilever beams 2 uniformly distributed along the circumferential direction are fixed on the circular base 8, each cantilever beam 2 is provided with a clamping claw 9 for placing a tested clamp, the clamping claws 9 are fixed at the free ends of the cantilever beams 2 through positioning pins 12, the section of each clamping claw 9 is in a fan shape, and an arc-shaped connecting line on the outer side of each clamping claw 9 forms a complete circle. The cross section of cantilever beam 2 is the fan shape, and the free end is provided with the ladder groove 13 that is used for fixed jack catch, is provided with locating hole 14 on the ladder groove 13, and the stiff end bottom of jack catch 9 is provided with the draw-in groove 15 with ladder groove complex, is provided with locating hole 16 on the draw-in groove 15, and locating hole 16 and locating hole 13 concentric setting, and the free end top of jack catch 9 is provided with fan-shaped dog 17 of placing the measured clamp. The force measuring head adopts split type structure, easy dismounting to the jack catch can be changed according to the clamp of different diameters, and it is more convenient to use, and application scope is wider.

The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims

1. Clamp chucking force measuring device, its characterized in that: the device comprises a force measuring head used for placing a tested clamp, wherein the force measuring head comprises a plurality of cantilever beams which are distributed circularly and are fixed on a circular base, the free end of each cantilever beam is connected with a claw used for placing the tested clamp, a strain gauge is stuck in the root of each cantilever beam, a temperature compensation sheet is stuck on the circular base of the force measuring head, the strain gauge, the temperature compensation sheet and the strain gauge are controlled by a computer, deformation of each cantilever beam generated when the clamp is clamped is detected by an electrical measurement method, strain information is transmitted to the computer, and the computer converts the radial pressure generated when the clamp is output and clamped to a radar chart distributed along the circumferential direction; the force measuring head mainly comprises a circular base, cantilever beams and clamping claws, wherein a threading hole and a fixing groove are formed in the center of the circular base, a plurality of cantilever beams which are uniformly distributed along the circumferential direction are fixed on the circular base, clamping claws for placing a tested clamp are arranged on each cantilever beam, the clamping claws are fixed at the free ends of the cantilever beams through bidirectional locating pins, the sections of the clamping claws are in a fan shape, and an outer arc connecting line of the clamping claws forms a complete circle; the cross section of the cantilever beam is fan-shaped, the free end of the cantilever beam is provided with a stepped groove for fixing a claw, the stepped groove is provided with a positioning hole, the bottom of the fixed end of the claw is provided with a clamping groove matched with the stepped groove, the clamping groove is provided with positioning holes, the two positioning holes are concentrically arranged, and the top of the free end of the claw is provided with a stop block for placing a detected clamp in a fan shape; the number of the cantilever beams is 8.