CN105258615A - Curvature measuring device of pipe-shaped object - Google Patents

Abstract

The invention provides a device for measuring the curvature of a tubular object, which includes horizontal and vertical workbenches perpendicular to each other. A smooth groove is arranged on the inner side of the horizontal workbench. The groove slides in the horizontal direction, and the two ends of the tubular sample are respectively set on the brackets at both ends; a pair of fixing devices are set in the middle of the inner side of the horizontal workbench, the coil is wound on the coil column, and the two ends of the coil are respectively wound around the two fixing devices And it is connected with the brackets at both ends, and the ring column is connected with the driving mechanism; the horizontal and vertical scales are arranged on the inner side of the horizontal workbench, and the light source and projection camera equipment are all set at the height of the tubular sample. Start the driving mechanism, and the tubular sample makes a uniform bending motion in the smooth groove along the direction of coil traction, and the projection camera equipment records the projection at the maximum bending degree. The device provided by the invention can directly obtain the index of the bending performance of the tubular object, has simple structure, convenient operation, low cost and high efficiency.

Description

A device for measuring the curvature of a tube

technical field

The invention relates to a measuring device, in particular to a measuring device for bending degree of a tubular object.

Background technique

According to the pharmaceutical industry standard YY0500-2004/ISO7198:1998 of the People's Republic of China, for wrinkled (corrugated) blood vessels, the wrinkles on the blood vessels that can be stretched and smoothed are mainly used to reduce the kinks and bends of the blood vessels. This helps to improve the compliance of the tube and reduce the formation of thrombus in the implanted vessel.

At present, the bending radius/radius is mainly used to characterize the bending radius formed on the inner side of the artificial blood vessel when it is bent. There are two test methods: 1) Form the sample into a circle, pull the two ends of the sample in opposite directions to reduce the circle shape until the bend appears; use a cylindrical sample of known diameter to insert into the circle to measure the bend diameter; 2) The sample is placed on a template that does not cause it to bend, and the radius of the smaller template is gradually replaced. When the sample is slightly bent, the radius of the template at this time represents the bending radius of the artificial blood vessel. The above method is complicated to operate and affects the experimental efficiency.

Contents of the invention

The technical problem to be solved by the present invention is to provide a measuring device for directly measuring the bending degree of tubular objects with simple structure, convenient operation and high efficiency.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is to provide a tube bending degree measuring device, which is characterized in that: it includes a horizontal workbench and a vertical workbench connected vertically to each other, and a smooth groove is arranged on the inner side of the horizontal workbench , the brackets are set on both ends of the smooth groove and can slide along the horizontal direction of the smooth groove. The two ends of the tubular sample are respectively set on the brackets at both ends; Wound on the coil post, the two ends of the coil are respectively bypassed by two fixing devices and connected with the sockets at both ends, and the coil post is connected to the driving mechanism;

The inner side of the horizontal workbench is provided with a horizontal scale, and the vertical scale is set in the middle of the vertical workbench and placed vertically with the horizontal scale;

Both the light source and the projection camera equipment are set directly to the height of the tubular sample.

Preferably, the horizontal scale is a symmetrically scaled scale.

Preferably, the ports at both ends of the tubular sample are fixed on the socket by clamps.

Preferably, the drive mechanism is a stepping motor drive mechanism.

When in use, the light source is turned on, and the tubular sample is clamped between the two brackets; the driving mechanism is started, and the tubular sample is bent at a uniform speed in the smooth groove along the direction of coil traction until it reaches the maximum bending degree; When the projection camera equipment records the projection at the maximum bending degree, use the vertical ruler to measure the bending chord height H of the tubular sample at this time, and use the horizontal ruler to measure the distance L between the two ends of the tubular sample at this time, and the tubular sample Curvature value = H/L.

The device provided by the invention overcomes the shortcomings of the prior art, can directly obtain the index of the bending performance of the tubular object, has simple structure, convenient operation, low cost and high efficiency.

Description of drawings

Fig. 1 is the schematic diagram of the device for measuring the bending degree of tubular objects provided by the present embodiment;

Fig. 2 is a curved projection diagram obtained in this embodiment.

detailed description

In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.

Fig. 1 is a schematic diagram of a tube bending measurement device provided by the present invention. The tube bending measurement device includes a workbench 1, a ruler 2 (placed perpendicular to each other), a clamp 3 (a pair), a stand 4, a sample 5. Fixing device 6, smooth groove 7, coil 8, coil column 9, drive mechanism 10, light source 11 and projection camera equipment 12.

The workbench 1 is made up of a horizontal workbench and a vertical workbench which are vertically connected to each other. The smooth groove 7 is located on the inner side of the horizontal workbench 1, and is the curved movement track of the sample. The base 4 is located at both ends of the smooth groove 7 and can slide in the horizontal direction, and is designed for fixing the two ends of the sample. A pair of fixing devices 6 are located in the middle of the inner side of the horizontal workbench 1. The coil 8 is wound on the coil column 9. The two ends of the coil 8 respectively go around the two fixing devices 6 and are connected to the brackets 4 at both ends. The coil column 9 is connected to the drive Mechanism 10, so as to realize that the coil guides the two ends of the sample to move inwardly and oppositely.

Scale 2 has two, mutually vertically placed, and a level is located at the inboard of horizontal workbench, and another root is vertically located on the vertical workbench. And the horizontal ruler is a ruler with a symmetrical scale, which can be read quickly. In this embodiment, the horizontal scale is preferably installed on the workbench 1 at a position close to the smooth groove 7, so as to facilitate quick reading of the length of the sample.

Before the test, both ends of the sample 5 are fixed on a pair of sockets 4, and finally the two ports of the sample are fixed by the clamp 3. In this way, after the drive mechanism 10 is started, the bending of the sample can proceed normally and stably, so that the required data for the experiment can be successfully measured.

Driven by the driving mechanism 10 , the sample 5 makes a uniform bending motion in the smooth groove 7 along the direction of the coil 8 pulling. The position of the light source 11 is facing the height of the sample 5, and the projection camera 12 is for recording the projection of the maximum bendable degree of the sample 5.

The driving mechanism 10 is a stepping motor driving mechanism, which is convenient for material selection and has strong operability, so that the device for measuring the bending degree of the tubular object can measure the bending degree value of any kind of tubular object.

The operation process of the above tubular bending degree measuring device is as follows: firstly, the light source 11 is turned on, and then the tubular sample 5 is clamped between the sockets 4, and the two ports are fixed with the clamp 3, and the horizontal symmetrical scale can be used to quickly measure The length of the sample, and then set the motion parameters (such as bending speed) on the driver of the stepping motor, and then start the stepping motor until the maximum bending degree is reached. At this time, the maximum bending arc projection can be obtained, and the vertical scale can be used to quickly The bending chord height of the sample can be accurately measured, so that the ratio of the chord height/the length of the tubular object can be calculated, which is the bending degree of the tubular object. As shown in Figure 2, the ratio of the chord height H/sample length L obtained by the projection camera equipment when projected into the maximum arc height (no bending) is defined as the curvature value of this tubular object.

In summary, a single experimenter can quickly and easily measure the curvature of the tubular object, and the operation is simple and efficient.

The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present invention, the technical solutions of the present invention can be simply deformed. The deformations all belong to the protection scope of the present invention.

Claims (5)

1. A tube curvature measuring device, characterized in that: comprise a horizontal workbench and a vertical workbench which are vertically connected to each other, the smooth groove (7) is arranged on the inner side of the horizontal workbench (1), and the base (4 ) are set at both ends of the smooth groove (7) and can slide along the horizontal direction of the smooth groove (7), and the two ends of the tubular sample (5) are respectively set on the brackets (4) at both ends; a pair of fixing devices (6) Located in the middle of the inner side of the horizontal workbench (1), the coil (8) is wound on the coil column (9), and the two ends of the coil (8) are respectively wound around two fixing devices (6) (4) connect, and coil post (9) connects driving mechanism (10); The inner side of the horizontal workbench is provided with a horizontal scale, and the vertical scale is set in the middle of the vertical workbench and placed vertically with the horizontal scale; Both the light source (11) and the projection camera equipment (12) are arranged directly to the height of the tubular sample (5). 2 . The device for measuring the curvature of a tubular object according to claim 1 , wherein the horizontal scale is a symmetrically scaled scale. 3 . 3. A device for measuring the bending degree of a tubular object according to claim 1, characterized in that: the ports at both ends of the tubular object sample (5) are fixed on the base (4) by clamps (3). 4. A device for measuring the curvature of a tubular object according to claim 1, characterized in that: the driving mechanism (10) is a stepping motor driving mechanism. 5. A device for measuring the bending degree of a tubular object according to claim 1, characterized in that: when in use, the light source (11) is turned on, and the tubular object sample (5) is clamped between two brackets (4) ; Start the driving mechanism (10), and the tubular sample (5) will perform a uniform bending motion in the smooth groove (7) along the direction of coil (8) traction until the maximum degree of bending is reached; at this time, the projection camera equipment (12) Record the projection at the time of the maximum bending degree, use the vertical scale to measure the bending chord height H of the tubular sample (5) at this time, and use the horizontal scale to measure the distance L between the two ends of the tubular sample (5). The curvature value of the sample (5) = H/L.