CN210401270U - Leather shrinkage temperature measuring device - Google Patents

Abstract

The utility model discloses a leather shrinkage temperature measuring device, which comprises a lifting frame, wherein the upper end of the lifting frame is provided with an upper hook, a sample is hung on the upper hook, and a counterweight rod and a mark are hung at the lower end of the sample; a heating cup is arranged below the upper hook, and the lifting frame moves downwards to immerse the sample into a heating medium; the heating cup is in an inverted convex shape, and the mark extends into an observation cavity at the lower end of the heating cup; a camera and a light source are arranged outside the observation cavity; a heater and a temperature sensor are arranged in the heating cup; and (3) heating the heating medium, recording the deformation quantity of the sample along with the change of the temperature until the deformation stops, and recording the temperatures of the deformation starting point, the rapid deformation point and the deformation stopping point to finish the measurement of the shrinkage temperature of the flexible material. The process that the leather is heated to generate effective shrinkage deformation in the medium can be recorded through the visual picture and is always in a set constant tension state, so that the accurate temperature at the shrinkage moment is obtained through the temperature sensor, locked and displayed and is used as the shrinkage temperature of the leather.

Description

Leather shrinkage temperature measuring device

Technical Field

The utility model belongs to the technical field of the flexible material thermal stability detects, a leather shrinkage temperature measurement device is related to.

Background

The shrinkage temperature is an important physical parameter detection item characterized by collagen and having flexibility in the mechanical properties of leather in the chemical field, heart valves in the biological engineering field, rubber and other materials, and particularly relates to the environmental temperature corresponding to the moment when a flexible material sample starts to shrink and deform under the influence of damp and heat in the continuous uniform heating process, which is the external expression that chemical bonds in the internal structure of the flexible material are subjected to damp and heat and break, so that the shrinkage temperature belongs to the inherent characteristics of the flexible material. By accurately detecting the shrinkage temperature, the kneading condition and the heat and humidity stability of the flexible material are directly reflected, data support is provided for determining chemical materials and environmental conditions in a kneading process, and guidance is provided for further processing and manufacturing flexible material products or selecting purposes, so that the accurate and convenient detection of the shrinkage temperature of the flexible material sample has great practical value, and the long-history leather shrinkage temperature is taken as an example for explanation.

At present, according to the national relevant standard, 50 x 3mm is firstly prepared according to the standard requirement in the leather shrinkage temperature detection²The sample is fixed, then a shrinkage deformation signal generated after the sample is placed in glycerol or other heating media and heated is provided for the singlechip, and the instant temperature of the heating media locked immediately is the shrinkage temperature of the flexible material sample. The specific implementation process is that one end of a flexible material sample is fixed, the other end of the flexible material sample is provided with a mark, and the movement distance of the mark is detected, namely, the displacement is generated to be used as the representation of the shrinkage deformation of the flexible material sample; in the process of measuring the shrinkage temperature, three grams of constant tension is required to be adopted to ensure that the sample is in an extension state so as to ensure the accuracy of measured data; in order to obtain a displacement signal in real time, a mark is generally required to be output to the outside of a heating container through related components in the measuring process, and then calibration (original pointer type in the standard) or signal acquisition (commonly used MSW-YD4 electronic type) is more conveniently carried out, at the moment, the leather also needs to overcome the action of friction force inevitably generated when the related mechanical transmission components move in the deformation process, so that the detection condition of three grams of constant tension is difficult to meet in engineering, and the friction force is usually generated under the normal conditionThe force is often close to or even greater than three grams of constant tension and it is difficult to satisfy the detection conditions, so that the technical problem of error in the detected shrinkage temperature is inevitably caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem lie in providing a leather shrink temperature measurement device, can be heated in heating medium through vision picture record leather sample and produce the process of effective shrink deformation and make it be in three grams permanent tension states all the time, accurate temperature that rethread temperature sensor obtained this shrink constantly is as its shrink temperature.

The utility model discloses a realize through following technical scheme:

a leather shrinkage temperature measuring device comprises a lifting frame, the upper end of which is provided with an upper hook, a sample is lifted on the upper hook, and the lower end of the sample is lifted by a lower hook to be provided with a mark; a heating cup for installing a heating medium is arranged below the upper hook, and the sample is positioned below the liquid level of the heating medium; the heating cup comprises a heating cavity and an observation cavity communicated with the bottom of the heating cavity, the heating cavity and the observation cavity are in an inverted convex shape, and the mark extends into the observation cavity; a camera and a light source facing the mark are respectively arranged outside the observation cavity; a heater and a temperature sensor which are fixedly connected to the lifting frame and extend into the heating cup are also arranged above the heating cup.

Furthermore, the lower end of the lower hook is provided with a counterweight rod which passes through a lower fixing plate fixed on the lifting frame, and the mark is arranged at the lower end of the counterweight rod.

Furthermore, the weight rod and the mark are of an integrated structure, and the lower hook is connected with the weight rod through a pressing buckle.

Further, the light source comprises a background light source which is arranged on the different side of the observation cavity from the camera, and an annular light source which is arranged on the same side of the observation cavity as the camera; the background light source adopts a plane purple light source; the annular light source and the camera are coaxially arranged.

Furthermore, the mark is a sheet with a specific shape such as a triangle, and a reflective coating with a red color is arranged on the mark.

Furthermore, a plurality of upper hooks are transversely arranged at the upper end of the lifting frame, the lower hooks are longitudinally in one-to-one correspondence with the upper hooks, and the marks are transversely arranged in the observation cavity.

Furthermore, the upper end of the lifting frame is connected with an upper fixing plate, and the upper hook, the temperature sensor and the heater are fixedly connected to the lower end of the upper fixing plate.

Furthermore, the bottom end of the lifting frame is provided with an operation panel, the operation panel is also provided with a display screen for displaying the displacement of the mark obtained by the camera, and the operation panel is also provided with a inching ascending switch and a inching descending switch for controlling the linear motor, a detection switch and a power switch arranged behind the device.

Furthermore, the heater is of an L + U-shaped structure, and heating wires of the heater are arranged on the horizontally distributed U-shaped part and are always in a light-load working state.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model provides a leather shrinkage temperature measuring device, prepare two sets of orthogonal direction in two ends set up the dumbbell shape sample of hanging hole, then hang the sample mode and fix on upper hook and lower hook, then the crane moves down and makes the sample dip in the heating medium, the sign stretches into the observation intracavity simultaneously and enters the camera field of vision scope; heating the heating medium, enabling the mark connected with the lower hook to simultaneously displace upwards when the flexible material sample shrinks and deforms, directly observing the displacement of the mark by a camera, and recording real-time temperatures corresponding to different deformation quantities until the sample does not deform; recording the temperature of the sample at the starting deformation, the rapid deformation and the stop deformation node to finish the measurement of the shrinkage temperature of the flexible material; the constant tension specified by the standard is always kept in the whole shrinkage deformation process of the flexible material, and the accuracy of shrinkage temperature measurement is ensured.

Drawings

FIG. 1 is a schematic view of the detection part of the apparatus;

FIG. 2 is a structural view of the present apparatus;

FIG. 3 is a structural view of an electric bar;

FIG. 4 is an image information acquired by the present apparatus;

fig. 5 is a schematic diagram of the present apparatus for detecting a displacement signal in image information.

The system comprises a lifting frame 1, an upper hook 2, a lower hook 3, a sample 4, a mark 5, a weight rod 6, a heating cup 7, a heating cavity 8, an observation cavity 9, a heating medium 10, an upper fixing plate 11, a lower fixing plate 12, a camera 13, a light source 14, a background light source 141, a ring light source 142, a heater 15, a temperature sensor 16, a base 17, an operation panel 18, a display screen 19, a inching ascending switch 20, a pressing buckle 21, a inching descending switch 22, a starting detection switch 23 and a power switch 24.

Detailed Description

Specific examples are given below.

As shown in fig. 1 and 2, a leather shrinkage temperature measuring device comprises a lifting frame 1, the upper end of which is provided with an upper fixed part and a hook 2, the lifting frame 1 is connected to a base 17 through a linear motor, and the linear motor drives the lifting frame 1 to move longitudinally; a sample 4 is hung on the upper hook 2, a heating cup 7 for installing a heating medium 10 is arranged below the upper hook 2, and the sample 4 is positioned below the liquid level of the heating medium 10; the lower end of the sample 4 is provided with the sample 4 through a lower hook 3 of a lower fixing piece in a hanging mode, a heater 15 is a U-shaped electric heating rod, a balance weight rod 6 connected with the lower end of the lower hook 3 penetrates through a U-shaped space of the U-shaped electric heating rod and an upper sliding hole of a lower fixing plate 12 in sequence and then is connected with a triangular thin sheet mark 5 through a flexible wire, and the difference between the total gravity of the lower end of the sample 4 and the mark 5 and the buoyancy of a heating medium 10 borne by the balance weight rod 6 and the mark 5 is three grams of gravity value, so that the sample 4 is always in a three gram tension state in the checking process; the heating cup 7 is specifically shown in fig. 1 and comprises a stainless steel heating cavity 8 and a transparent observation cavity 9 communicated with the bottom of the heating cavity 8, the heating cavity 8 and the observation cavity 9 are in an inverted convex shape, the mark 5 extends into the observation cavity 9, the heating cavity 8 and the observation cavity 9 are in arc transition, and the included angle between the bottom end of the heating cavity 8 and the horizontal direction is more than 45 degrees, so that the mark 5 can smoothly enter the observation cavity 9 when falling is detected each time, and the mark can still slide into the observation cavity even if slightly deviated due to possible shaking in the falling process; the glycerol background in the observation cavity 9 is only 1.5mm thick and reaches fine transparent state under the irradiation of the purple plane background light source 141, the shrinkage deformation that the leather is heated and takes place is converted into the vertical displacement of the mark 5, the weight rod 6 adopts a stainless steel rod, the counter weight function is realized through the stainless steel rod, thereby necessary condition is created for further reducing the glycerol thickness in the observation cavity 9 and improving the transparency degree of the glycerol thickness in the observation cavity for the flakiness of the mark 5, the stainless steel rod directionally slides in the slide holes on the upper fixing plate 11 and the lower fixing plate 12, the set position of the sample 4 among each other is ensured, and powerful support is provided for one camera 13 to detect a plurality of marks 5 simultaneously.

Furthermore, the sample 4 is dumbbell-shaped, which not only creates conditions for the convenient fixing mode of the upper hook 2 and the lower hook 3 to the sample 4, but also effectively solves the problem that the connection part of the upper hook 2 and the lower hook 3 and the sample 4 is possibly torn due to overlarge pressure intensity in the shrinkage temperature measuring process so as to influence the normal detection, for example, the diameter of the circle at two ends of the dumbbell-shaped sample 4 is 6mm, and the diameter of the hanging hole in the middle is 2 mm; the net pulling force of the sample 4 is three grams of gravity after the total weight of the weight lever 6 and the mark 5 minus the buoyancy of the heating medium 10, which not only meets the detection condition, but also enables the sample 4 to be in the ideal free suspension state all the time in the detection process; the sample 4 is always kept under the standard detection condition that the constant tension is three grams of gravity, so that the detection data is authoritative.

Further, as shown in fig. 1 and 3, the lower hook 3, the weight lever 6, the sign 5 and the like are integrated to form a standard weight lever 6; the heating medium 10 is glycerol, the weight rod 6 is a stainless steel rod with the diameter of 3mm, and the observation cavity 9 is 1.5mm in width, 35mm in depth and 100mm in length. The mark 5 is a triangular thin sheet with the thickness of 0.5 mm, the image of the mark 5 in the glycerol is very clear, and the interface is clear; and the sample 4 is also provided with a heater 15 and a temperature sensor 16 which are fixedly connected to the lifting frame 1 and extend into the heating cup 7, and the model of the temperature sensor 16 is PT 1000. The heater 15 is specially designed to be an L + U-shaped electric heating rod structure, as shown in fig. 3. Wherein the horizontal section of the electric heating rod is U-shaped and the heating wires are distributed only in the section, in this way, the uniformity of the temperature distribution of the heating medium 10 inside the heating cup 7 is ensured without using a stirrer, and in order to effectively prolong the service life, the heating wires of the electric heating rod are set to always work in a light load state, such as a method of effectively prolonging the service life by using a special design such that the normal output power is 300W but the actual working output power is 200W. In addition, the heating wires are only distributed in the U-shaped horizontal section heating structure, and the vertical part uses a special design that the conducting wires do not generate heat, so that the counterweight rod 6 can conveniently and smoothly pass through the U-shaped space, and the technical requirement that the temperature difference between the upper end and the lower end of the sample 4 is less than 1 ℃ can be met by ensuring the uniform heating degree of the sample 4 fixed right above the counterweight rod under the condition that the glycerol forms natural circulation after being heated, thereby avoiding the arrangement of a stirring device and simplifying the system structure. Heating media 10 on two sides of the sample 4 are uniformly heated, and the automatic temperature control system controls the heating rod to ensure that the heating media 10 are heated at a constant speed of 2 ℃/min; the temperature sensor 16 and the camera 13 which are arranged at the middle position of the height of the sample 4 and the output end of the rear-end image processing unit are connected with the single chip microcomputer, the camera 13 collects shrinkage deformation-displacement signals of the sample 4 in real time through the mark 5, the temperature sensor 16 senses the temperature at the moment and records the temperature through the single chip microcomputer, then a graph of the deformation and the temperature is displayed on the display screen 19, a corresponding database is established, the shrinkage temperature is locked according to relevant regulations of detection standards, and the like.

Further, as shown in fig. 1, an upper fixing plate 11 at the upper end of the crane 1, an upper hook 2, a temperature sensor 16 and a heater 15. The lifting frame 1 is driven by a linear motor, an upper fixing plate 11 moves longitudinally and drives a sample 4 to extend into a heating cup 7, and meanwhile, a temperature sensor 16 and a heater 15 also extend into the heating cup 7;

as shown in fig. 1, the light source 14 is a background planar light source 14, and the background planar light source 14 is a violet light source 14. The sign 5 is triangular or circular, and a reflective coating is arranged on the sign 5, and the color of the reflective coating is red or yellow. The red reflecting coating on the surface of the mark 5 ensures that the image in the glycerol is very clearly protruded and the interface is clear; the surface of the mark 5 is pure red or pure yellow and has special shapes such as triangle or circle, so that the mark 5 and sundries such as scurf and the like in the heating medium 10 which may sink to the visual field of the camera 13 are distinguished, and the uniqueness of the detected mark 5 is ensured. In order to realize the smooth collection of images, the method achieves the aim of effectively improving the signal to noise ratio by reducing noise and improving signals at the same time: firstly, the background noise is reduced by further increasing the transparency of the heating medium 10 on the basis of reducing the thickness of the heating medium as much as possible by arranging the background light source 141 behind the transparent observation cavity 9; then, the annular light source 142 is arranged in front to highlight the mark 5 to improve the signal, namely, a reflective coating is arranged on the mark 5 to reduce the influence of the cup wall of the heating cup 7 and the black heating medium 10 on the measurement result; the reflective coating reflects the light irradiated by the visible light source 14, and the mark 5 is made to protrude from the background in the closed darkroom space by using the mode that the reflective coating emits visible light; therefore, the paving of the road by signal acquisition and image processing is better realized. The light source 14 is a background plane light source 14, the background plane light source 14 is a purple light source 14, the purple light source 14 is high in penetrability, the problem that the transparency of the background color close to black is high when glycerin is used as the heating medium 10 can be better solved, and the camera 13 can be more beneficial to searching for the target of the mark 5 in the background color. In addition, the reflective coating is red or yellow in color. The red or yellow reflective coating is such that the target is more visible on the black glycerol background for the markers 5 to be more prominent for detection.

Further, as shown in fig. 2, a plurality of upper hooks 2 are transversely arranged at the upper end of the lifting frame 1, the lower hooks 3 are longitudinally in one-to-one correspondence with the upper hooks 2, and the marks 5 are transversely arranged in the observation cavity 9; the present apparatus can simultaneously measure a plurality of samples 4.

Further, as shown in fig. 1 and 2, an operation panel 18 is arranged at the bottom end of the crane 1, and a display screen 19 for displaying displacement information acquired by the camera 13 is further arranged on the operation panel 18, that is, information of deformation of the sample 4 along with temperature change; finally, a curve graph of the deformation of the sample 4 along with the change of the temperature is output, and the deformation quantity of each sample 4, the change curve of the environment temperature along with the time and the data of key nodes are displayed, so that experimenters can observe and know the detection progress state, relevant data and the like at any time; the operating panel 18 is also provided with a inching ascending switch 20 and a inching descending switch 22 for controlling the linear motor, wherein the inching button is mainly used for forcing an operator to ensure the operating mode of continuous ascending movement without leaving the switch by hand all the time, so that the eyes of the operator can always pay attention to whether the position between the heating cup 7 and the lifting frame 1 is aligned during the ascending and descending process, and the phenomenon that the heating cup 7 is collided and damaged by adopting a common switch once continuously ascends under the condition of deviating from the normal position due to inclination and the like in the automatic ascending process of the heating cup 7 is avoided; and the linear motor drives and controls the lifting frame 1 to drive the upper hook 2 of the upper fixing plate 11, the temperature sensor 16 and the heater 15 to move longitudinally. A start detection switch 23 is provided on the front surface of the operation panel 18 to control the operation start of the cameras and 13 and the related recording devices, and a power switch 24 is provided on the rear surface of the apparatus to control the power supply of the apparatus.

Further, the heating cup 7 is formed by bonding the heating cavity 8 and the observation cavity 9 by using high-temperature glass cement, wherein the heating cavity 8 is made of stainless steel, and the observation cavity 9 is made of high-temperature-resistant transparent quartz glass, because if all the heating cavities are made of high-temperature-resistant quartz glass and are completely transparent, the process is complex and high in cost, and a stainless steel sleeve still needs to be sleeved outside the heating cavity 8 so as to be convenient to hold and place and protect a fragile glass container. Therefore, the two materials are respectively processed and manufactured and then are bonded by high-temperature glass cement, so that the high cost performance of the heating cup 7 is realized, and the practicability is met. The smaller the front-rear space distance of the observation chamber 9, the better but more than 1 mm greater than the thickness of the marking 5, in order to ensure that the marking 5 is always freely suspended in glycerol. In this example, the thickness of the stainless steel triangular thin sheet used as the mark 5 is 0.5 mm, the width of the transparent groove of the observation cavity 9 is 1.5mm, and after the black glycerin used as the heating medium 10 for one year is used, the test result still shows good transparent effect, and the expected target is achieved.

As shown in fig. 4, the camera 13 can simultaneously acquire image information of the four markers 5.

As shown in fig. 5, is a camera13, shooting an M frame image and an M +1 frame image, wherein the pixel sizes of the images are 480 × 640, namely, each image can be divided into 480 columns and 640 rows according to the pixels; it can be seen from the image that the mark 5 is located in the N +2 th row, when the temperature reaches the temperature at which the sample 4 shrinks, the second sample 4 starts to shrink upwards at the moment of M +1 frame, that is, the position of the mark 5 rises to the N +1 th row, that is, a pixel displacement is generated; in the continuous scanning process, the shrinkage temperature defined according to the standard is combined with a corresponding temperature signal, so that the single chip microcomputer can easily obtain the shrinkage temperature of the sample 4; by analogy, the shrinkage temperature of the other sample 4 can be measured. In order to improve the accuracy of the shrinkage temperature measurement, with a higher pixel camera 13, the observed displacement of shrinkage distortion will be more accurate, and the accuracy of the final measured shrinkage temperature will be higher. For example, if the pixel of each frame of image is 960 × 1280, the visual field of the camera 13 is 25 × 25mm²Then, each pixel represents the actual 0.02mm, which is the displacement detection precision.

The device directly obtains the displacement signal from the mark 5 freely suspended at the lower end of the sample 4 in the heating medium 10 through the visual technology, and realizes the detection requirement that the sample 4 is always at 3 g constant tension in the detection process and effectively solves the new problem of difficult mark signal acquisition in the complex background environment caused by the detection requirement for the first time from the combination of theory and practice.

Although the method for directly detecting shrinkage deformation (displacement) by the visual technology aiming at the fact that the balance weight rod 6 and the mark 5 are directly hung at the lower end of the sample 4 well solves the detection condition that the sample is always at 3 g constant tension, the method brings a new technical problem that the uncertainty of the heating medium 10 serving as a target background causes difficulty in acquiring displacement signals of the mark 5. In order to effectively solve the phenomenon that the noise is large and even the mark 5 can be submerged in the background in the determination process caused by the complicated background of the target; the mode through noise reduction and reinforcing signal has obtained fine effect simultaneously in this device, and concrete measure is:

1. the degree of transparency of the heating medium 10 in the camera 13 is increased to achieve the object of reducing background noise. The specific measures are that black glycerin which is used for a long time is changed into new glycerin with high transparency, so that conditions are created for accurately and reliably acquiring displacement signals in real time; however, the above method is too costly for the unit of use, so reducing the thickness of the heating medium 10 in the observation chamber 9 as much as possible is the basic method for increasing the transparency of the heating medium 10; on the basis, the transparency of the heating medium 10 serving as a target background is further increased by using a specially-arranged purple plane background light source 141, so that the problem of large noise in the measurement process caused by the complicated target background is solved; the mark 5 is selected to be a thin sheet with the thickness of 0.5 mm, and the thickness of the glycerol in the visual field range of the camera 13 is only 1.5 mm. Experiments prove that black glycerin used for one year in the case still presents a very good transparency state at the thickness;

2. the shape and optical characteristics of the mark 5 are improved so as to be more prominent than the background, thereby achieving the goal of improving the displacement signal. Specifically, a high-temperature resistant reflective coating is coated on the surface of the mark 5, and the mark 5 in the heating medium 10 is more prominent by combining a method of irradiating by the annular light source 142 on the same side as the camera 13; meanwhile, the reflective coating on the surface of the mark 5 is specially designed into red or yellow and the shape of the reflective coating is designed into a special shape such as triangle or circle, so that the mark 5 can be distinguished from sundries such as scurf and the like sinking to the visual field range of the camera in the heating medium 10, the uniqueness of the mark 5 is ensured, and the mark 5 can be accurately identified so as to improve the anti-interference capability of the mark.

In addition, the main matched improvement technologies surrounding the above core technologies are:

1. an L + U type electric heating rod light load heating technology.

The heater 15 adopts a specially-arranged L + U-shaped electric heating rod structure, wherein the horizontal section of the heating rod is U-shaped, and the heating wires are only distributed in the section, and in order to effectively prolong the service life, the electric heating rod adopts a method of always working in a light load state (for example, an electric heater with normal output power of 300W is always working in a state of outputting 200W by utilizing a special design) to prolong the service life. In addition, the horizontal section of the heating rod is in the U-shaped structural arrangement, so that the counterweight rod 6 can conveniently and smoothly pass through the heating rod, the heating medium 10 can meet the technical requirement when the sample 4 fixed right above the counterweight rod 6 forms natural circulation after glycerol is heated, and the temperature difference between the upper end and the lower end of the sample 4 is smaller than 1 degree, so that the arrangement of a stirring rod is avoided, the system structure is simplified, the existing detection mode only needs about 400 grams of the heating medium 10 every time, and compared with the original heating medium 10 which is usually 1000 grams, the power consumption of a main machine is reduced by half.

2. Bonding composite structure technology for transparent observation cavity 9 and heating cavity 8 in inverted convex heating container

If the conventional heating container is made of high-temperature-resistant quartz glass, the whole heating container has a transparent characteristic, the process is complex and high in cost, the heating cavity 8 does not need the transparent function as long as the observation cavity 9 needs the transparent function, and the structure is still externally sleeved with a stainless steel sleeve with a handle and supporting legs so as to be convenient for holding and stably placing the heating cup 7 and protecting the heating cup 7 made of glass materials. Therefore, the heating cavity 8 and the observation cavity 9 are divided into two materials which are respectively processed and manufactured and then are bonded by high-temperature glass cement, so that the high cost performance of the heating container is realized, and the practicability is met. The design is to ensure that the mark 5 is prevented from being placed on the horizontal plane of the joint due to inevitable shaking in the falling process of the detection frame, and the mark can naturally slide into the transparent groove by means of the horizontal component force of the gravity of the mark on the inclined surface of the glass, so that the normal detection is ensured.

3. Bottom plate technology

In order to ensure that components including a balance weight rod 6, a mark 5 and the like below the lower hook 3 are integrally and orderly placed with the host machine during the non-use period of the instrument and prepare for next detection, a lower fixing plate 12 is also needed to be arranged, and a sliding hole corresponding to the sample hanging plate is arranged in the lower fixing plate to ensure that the sample 4 is vertically fixed; the two ends of the weight rod 6 are connected with the lower hook 3 and the press buckle 21 of the flexible wire, so that the weight rod can only slide in the lower fixing plate 12 and cannot be separated; in addition, the lower fixing plate 12 is specially made of polytetrafluoroethylene material to prevent the possibility of corrosion to the metal rod caused by long-time non-use; meanwhile, the thickness of the lower fixing plate 12 is at least 5mm, so that the marks 5 are distributed at the positions of each other, the cameras 13 can distinguish the four samples 4, and displacement signals can be collected conveniently. Because a slide hole of a certain thickness means fixing the directivity of the slide of the weight bar 6 in the longitudinal direction by using the principle of "two points determine a straight line".

Except that a host connected with the camera 13 has three main temperature node locking display and corresponding temperature and change curve display of the length of the sample 4, the wireless transmission function of a display terminal (a computer, a mobile phone and the like) and intelligent functions of dry burning prevention, voice prompt and the like are provided based on the modern IT technology and data processing.

The embodiments given above are preferred examples for implementing the present invention, and the present invention is not limited to the above-described embodiments. Any non-essential addition and replacement made by the technical characteristics of the technical scheme of the invention by a person skilled in the art belong to the protection scope of the invention.

Claims (9)

1. The leather shrinkage temperature measuring device is characterized by comprising a lifting frame (1) with an upper hook (2) at the upper end, wherein a sample (4) is lifted from the upper hook (2), and a mark (5) is lifted from the lower end of the sample (4) through a lower hook (3); a heating cup (7) for installing a heating medium (10) is arranged below the upper hook (2), and the sample (4) is positioned below the liquid level of the heating medium (10); the heating cup (7) comprises a heating cavity (8) and an observation cavity (9) communicated with the bottom of the heating cavity (8), the heating cavity (8) and the observation cavity (9) are in an inverted convex shape, and the mark (5) extends into the observation cavity (9); a camera (13) and a light source (14) facing the mark (5) are respectively arranged on the outer side of the observation cavity (9); a heater (15) and a temperature sensor (16) which are fixedly connected to the lifting frame (1) and extend into the heating cup (7) are also arranged above the heating cup (7).

2. A leather shrinkage temperature measuring device according to claim 1, characterized in that the lower end of the lower hook (3) is provided with a weight rod (6) which passes through a lower fixing plate fixed on the lifting frame (1), and the mark (5) is arranged at the lower end of the weight rod (6).

3. A leather shrinkage temperature measuring device according to claim 2, characterized in that the weight lever (6) and the mark (5) are an integral structure, and the lower hook (3) is connected with the weight lever (6) through a press buckle (21).

4. A leather shrinkage thermometry apparatus according to claim 1, wherein the light source (14) comprises a background light source (141) on a different side of the observation chamber (9) than the camera (13), and a ring light source (142) on the same side of the observation chamber (9) as the camera (13); the background light source (141) adopts a plane purple light source; the annular light source (142) is arranged coaxially with the camera.

5. A leather shrinkage temperature measuring apparatus according to claim 1, wherein the mark (5) is a specific shape sheet such as a triangle, and the mark (5) is provided with a red-colored reflective coating.

6. A leather shrinkage temperature measuring device according to claim 1, characterized in that a plurality of upper hooks (2) are transversely arranged at the upper end of the lifting frame (1), the lower hooks (3) are longitudinally corresponding to the upper hooks (2) one by one, and the marks (5) are transversely arranged in the observation cavity (9).

7. A leather shrinkage temperature measuring device according to claim 1, characterized in that the upper end of the lifting frame (1) is connected with an upper fixing plate (11), and the upper hook (2), the temperature sensor (16) and the heater (15) are fixedly connected with the lower end of the upper fixing plate (11).

8. A leather shrinkage temperature measuring device according to claim 7, characterized in that the bottom of the lifting frame (1) is provided with an operation panel (18), the operation panel (18) is further provided with a display screen (19) for displaying the displacement of the mark (5) obtained by the camera (13), the operation panel (18) is further provided with a inching ascending switch (20) and a inching descending switch (22) for controlling the linear motor, a starting detection switch (23) and a power switch (24) arranged at the back of the device.

9. A leather shrinkage temperature measuring device according to claim 1, wherein the heater (15) is of an L + U type structure, and heating wires of the heater (15) are arranged in a U-shaped part which is horizontally distributed and are always in a light load working state.

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