Degradable plastic high-temperature environment stress testing equipment

Abstract

The utility model relates to the technical field of testing equipment, and discloses degradable plastic high-temperature environment stress testing equipment which comprises a detection box, a temperature control assembly is fixedly installed on the surface of the detection box, a negative pressure adsorption assembly is fixedly installed on the bottom wall of the detection box, and an air exhaust assembly is fixedly installed at the bottom of the detection box. The negative pressure adsorption assembly is used for placing a degraded plastic sample, the air suction assembly is used for sucking air between the negative pressure adsorption assembly and the degraded plastic sample, an air cylinder is fixedly mounted at the top of the detection box, and an elastic pressure head assembly is fixedly mounted at the output end of the bottom of the air cylinder. Air is sucked through the air pump, so that the air circularly flows among the detection box, the fixed cover and the connecting pipe, and the air is heated through the heating wire; meanwhile, the temperature in the detection box is monitored in real time through a temperature sensor, and the temperature of the degraded plastic sample during stress whitening detection is known; therefore, the purpose of detecting the stress condition of the degraded plastic in the high-temperature environment can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, in particular to a stress testing equipment for degradable plastics in high-temperature environment. Background Technique

[0002] After the production of degradable plastics, in order to understand the properties of plastics, it is necessary to detect the compressive and tensile properties of degradable plastics, etc., and it is also necessary to detect the internal stress of degradable plastics. Since when degradable plastics are subjected to external forces, their surfaces will turn white under the action of stress. Therefore, when detecting the stress of degradable plastics, generally, an external force is applied to observe the discoloration of degradable plastics.

[0003] A Chinese patent with an application date of September 27, 2021 and a publication number of CN215985580U discloses a device for testing stress whitening of plastics. It includes a falling ball device and a fixing table used in cooperation. A fixing block is arranged on one side of the fixing table, and a moving block that can move on the fixing table is arranged on the other side. A through groove is arranged on the fixing table. The moving block has a threaded part that can pass through the through groove and a moving part connected to the threaded part. A tightening nut is arranged on the threaded part. The device of the utility model has a simple structure, uses the fixing block and the moving block together to fix the plastic sample, adapts to plastic samples of different sizes, and is especially suitable for plastic samples with a certain thickness.

[0004] In this technical solution, the plastic is clamped and fixed by the fixing block and the moving block, and then the impact ball is released by the falling ball device to apply an impact force to the plastic to detect the stress whitening of the plastic. However, when the fixing block and the moving block clamp and fix the degradable plastic, it is easy to apply extra pressure to the degradable plastic, and the pressure is uneven, which is easy to affect the detection effect; in addition, it does not have the condition to detect the stress whitening of degradable plastics in a high-temperature environment; thus, further improvement can be made. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] Aiming at the deficiencies of the prior art, the utility model provides a stress testing equipment for degradable plastics in high-temperature environment, which has the advantages of fixing the degradable plastics to avoid generating extra pressure, facilitating the detection of stress whitening of degradable plastics in high-temperature environment, etc., and solves the problems that clamping and fixing the degradable plastics from the side is easy to generate extra pressure and affect the stress whitening detection, and does not have the condition to detect the stress whitening of degradable plastics in high-temperature environment.

[0007] (2) Technical Solutions

[0008] To achieve the above object of fixing the degradable plastic to avoid generating additional stress and facilitating the detection of stress whitening of the degradable plastic in a high-temperature environment, the present utility model provides the following technical solutions: A stress testing device for degradable plastic in a high-temperature environment, including a detection box, a temperature control component is fixedly installed on the surface of the detection box, a negative pressure adsorption component is fixedly installed on the bottom wall of the detection box, an air extraction component is fixedly installed at the bottom of the detection box, the negative pressure adsorption component is used to place the degradable plastic sample, the air extraction component is used to suck the air between the negative pressure adsorption component and the degradable plastic sample, a cylinder is fixedly installed on the top of the detection box, and an elastic pressing head component is fixedly installed at the output end of the bottom of the cylinder.

[0009] Preferably, a box door is hinged on the front side of the detection box, an observation window is arranged on the surface of the box door, ventilation openings are opened on both sides of the detection box, and the ventilation openings are communicated with the temperature control component.

[0010] Preferably, the temperature control component includes two fixed covers fixedly installed on both sides of the detection box, the detection box is communicated with the fixed covers through the ventilation openings, a connecting pipe is fixedly installed between the two fixed covers, an air pump is arranged on the connecting pipe, and a heating wire is fixedly installed in one of the fixed covers.

[0011] Preferably, the negative pressure adsorption component includes a tray and a retaining ring fixedly installed on the bottom wall of the detection box, the tray and the retaining ring are concentrically arranged, an annular groove is formed between the tray and the retaining ring, a gas guiding groove is opened at the center of the bottom of the tray, and communication holes are arranged in an array on the side surface of the tray, and both ends of the communication holes are communicated with the gas guiding groove and the annular groove respectively.

[0012] Preferably, the air extraction component includes a piston cylinder fixedly installed at the bottom of the detection box, a limiting ring is fixedly installed on the inner wall of the piston cylinder, the piston cylinder is divided into a left half and a right half by the limiting ring, an air hole is opened in the right half of the piston cylinder, a through hole is penetrated and opened at the bottom of the detection box, the air hole, the gas guiding groove and the through hole are communicated, a piston plate is slidably connected in the left half of the piston cylinder, a threaded rod is rotatably connected to the left side of the piston plate, a threaded hole is opened at the left end of the piston cylinder, and the threaded rod is threadedly connected with the threaded hole.

[0013] Preferably, the elastic pressing head component includes a sleeve fixedly installed at the output end of the bottom of the cylinder, a pressing rod is slidably connected through the bottom of the sleeve, and a spring is fixedly installed between the top end of the pressing rod and the top wall of the sleeve.

[0014] Preferably, a guiding groove is penetrated and opened on the surface of the sleeve, a pointer is fixedly installed on the side surface of the top end of the pressing rod, the pointer is slidably connected through the guiding groove, and length scales are arranged on the surface of the sleeve and on both sides of the guiding groove.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides a high-temperature environmental stress testing device for degradable plastics, which has the following beneficial effects:

[0017] 1. For this high-temperature environmental stress testing device for degradable plastics, by placing the degradable plastic sample to be detected on the top of the tray and the support ring, rotating the threaded rod drives the piston plate to slide leftward inside the piston cylinder, making the right half of the piston cylinder in a negative pressure state. As a result, the annular groove between the tray and the support ring is in a negative pressure state, and the degradable plastic sample is adsorbed on the top of the tray and the support ring by the negative pressure; the adsorption force applied to the degradable plastic is in the same direction as the pressure applied by the pressure rod on the degradable plastic, avoiding additional forces in other directions.

[0018] 2. For this high-temperature environmental stress testing device for degradable plastics, the air pump sucks air, making the air circulate between the detection box, the fixed cover and the connecting pipe, and heating the air through the heating wire; at the same time, the temperature inside the detection box is monitored in real time by the temperature sensor to understand the temperature during the stress whitening detection of the degradable plastic sample; thus, the purpose of detecting the stress condition of the degradable plastic in a high-temperature environment can be achieved.

[0019] 3. For this high-temperature environmental stress testing device for degradable plastics, when the output shaft of the cylinder extends, it drives the pressure rod to press on the degradable plastic sample. As the output shaft of the cylinder extends, the pressure rod and the sleeve slide relative to each other, and the spring is gradually compressed; at the same time, the pointer slides in the guiding groove and indicates the pressure length of the spring on the length scale, thereby controlling the pressure applied by the pressure rod on the degradable plastic. Thus, the purpose of facilitating the control of the pressure applied to the degradable plastic can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of a high-temperature environmental stress testing device for degradable plastics proposed by the utility model;

[0021] Figure 2 It is a three-dimensional sectional structure schematic diagram of a high-temperature environmental stress testing device for degradable plastics proposed by the utility model after removing the temperature control component;

[0022] Figure 3 It is a three-dimensional exploded structure schematic diagram of the temperature control component of a high-temperature environmental stress testing device for degradable plastics proposed by the utility model;

[0023] Figure 4 It is a three-dimensional sectional structure schematic diagram of the negative pressure adsorption component and the air extraction component of a high-temperature environmental stress testing device for degradable plastics proposed by the utility model;

[0024] Figure 5 It is a three-dimensional exploded structure schematic diagram of the elastic pressing head component of a high-temperature environmental stress testing device for degradable plastics proposed by the utility model.

[0025] In the figure: 100, detection box; 200, temperature control component; 300, negative pressure adsorption component; 400, air extraction component; 500, cylinder; 600, elastic indenter component; 101, box door; 102, observation window; 103, ventilation opening; 201, fixed cover; 202, connecting pipe; 203, air pump; 204, heating wire; 205, temperature sensor; 301, tray; 302, support ring; 303, air guide groove; 304, communication hole; 401, piston cylinder; 402, limit ring; 403, air hole; 404, piston plate; 405, threaded rod; 406, threaded hole; 601, sleeve; 602, pressure rod; 603, spring; 604, guide groove; 605, pointer; 606, length scale. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figure 1 - Figure 2 , a high-temperature environmental stress test device for degradable plastics, including a detection box 100, a temperature control component 200 fixedly installed on the surface of the detection box 100, a negative pressure adsorption component 300 fixedly installed on the bottom wall of the detection box 100, an air extraction component 400 fixedly installed at the bottom of the detection box 100. The negative pressure adsorption component 300 is used to place the degradable plastic sample, and the air extraction component 400 is used to suck the air between the negative pressure adsorption component 300 and the degradable plastic sample. A cylinder 500 is fixedly installed on the top of the detection box 100, and an elastic indenter component 600 is fixedly installed at the output end of the bottom of the cylinder 500.

[0028] Please refer to Figure 1 - Figure 3, a box door 101 is hinged to the front side of the detection box 100, and an observation window 102 is arranged on the surface of the box door 101. Through the arrangement of the observation window 102, it is convenient to observe the stress whitening detection situation of the degradable plastic in real time. Ventilation openings 103 are provided on both sides of the detection box 100, and the ventilation openings 103 are communicated with the temperature control component 200. The temperature control component 200 includes two fixed covers 201 fixedly installed on both sides of the detection box 100. The detection box 100 is communicated with the fixed covers 201 through the ventilation openings 103. A connecting pipe 202 is fixedly installed between the two fixed covers 201, and an air pump 203 is arranged on the connecting pipe 202. A heating wire 204 is fixedly installed in one of the fixed covers 201. Through the suction effect of the air pump 203 on the air, the air circulates between the detection box 100, the fixed covers 201 and the connecting pipe 202, and the air is heated when passing through the heating wire 204. The temperature inside the detection box 100 is monitored in real time by a temperature sensor 205. The temperature sensor 205 and the heating wire 204 are electrically connected to a controller. By presetting the temperature range through the controller, the temperature sensor 205 monitors the temperature inside the detection box 100 and transmits the signal to the controller, and then the heating time of the heating wire 204 is controlled by the controller, so that the temperature inside the detection box 100 is maintained within the preset temperature range.

[0029] Please refer to Figure 4 , the negative pressure adsorption component 300 includes a tray 301 and a retaining ring 302 fixedly installed on the bottom wall of the detection box 100. The tray 301 and the retaining ring 302 are concentrically arranged. An annular groove is formed between the tray 301 and the retaining ring 302. A gas guide groove 303 is opened at the center of the bottom of the tray 301, and communication holes 304 are arranged in an array on the side surface of the tray 301. Both ends of the communication holes 304 are communicated with the gas guide groove 303 and the annular groove respectively. The degradable plastic sample to be detected is placed on the tops of the tray 301 and the retaining ring 302 and covers the top of the annular groove.

[0030] Please refer to Figure 4, the air extraction assembly 400 includes a piston cylinder 401 fixedly installed at the bottom of the detection box 100. A limit ring 402 is fixedly installed on the inner wall of the piston cylinder 401. The piston cylinder 401 is divided into a left half and a right half by the limit ring 402. An air hole 403 is opened in the right half of the piston cylinder 401. A through hole is penetrated through the bottom of the detection box 100. The air hole 403, the air guide groove 303 and the through hole are communicated. A piston plate 404 is slidably connected in the left half of the piston cylinder 401. The piston plate 404 is limited by the limit ring 402 to prevent the piston plate 404 from sliding to the position of the air hole 403. A threaded rod 405 is rotatably connected to the left side of the piston plate 404. A threaded hole 406 is opened at the left end of the piston cylinder 401. The threaded rod 405 is threadedly connected to the threaded hole 406. By rotating the threaded rod 405 and cooperating with the threaded connection of the threaded rod 405 and the threaded hole 406, the piston plate 404 is driven to move leftward, so that the right half of the piston cylinder 401 is in negative pressure. Through the communication of the air hole 403, the through hole, the air guide groove 303 and the communication hole 304, the right half of the piston cylinder 401 is communicated with the annular groove, so that the annular groove is in negative pressure, thereby fixing the degradation plastic sample to be detected on the tops of the tray 301 and the retaining ring 302. And by fixing the degradation plastic sample by negative pressure, the direction of the force applied to the plastic sample is vertically downward, and the force applied to the degradation plastic sample by the assembly of the cylinder 500 and the elastic indenter assembly 600 is also vertically downward, so as to avoid generating additional pressures with different directions and ensure the detection effect of the degradation plastic sample.

[0031] Please refer to Figure 5 , the elastic indenter assembly 600 includes a sleeve 601 fixedly installed at the bottom output end of the cylinder 500. A pressure rod 602 is slidably connected through the bottom of the sleeve 601. A spring 603 is fixedly installed between the top end of the pressure rod 602 and the top wall of the sleeve 601. A guide groove 604 is penetrated through the surface of the sleeve 601. A pointer 605 is fixedly installed on the side surface of the top end of the pressure rod 602. The pointer 605 is slidably connected through the guide groove 604. Length scales 606 are arranged on the surface of the sleeve 601 and on both sides of the guide groove 604. By the elongation of the output shaft of the cylinder 500, the assembly of the sleeve 601 and the pressure rod 602 is driven to squeeze on the degradation plastic sample. As the output shaft of the cylinder 500 elongates, the sleeve 601 and the pressure rod 602 slide relative to each other, and the spring 603 is gradually compressed, and the pressure of the pressure rod 602 on the degradation plastic sample is gradually increased. And the pointer 605 slides in the guide groove 604 and indicates the compression length of the spring 603 on the length scale 606.

[0032] Working principle: First, place the sample of degradable plastic to be detected on the top of the tray 301 and the support ring 302. Rotate the threaded rod 405 to drive the piston plate 404 to slide leftward inside the piston cylinder 401, making the right half of the piston cylinder 401 in a negative pressure state. As a result, the annular groove between the tray 301 and the support ring 302 is in a negative pressure state, and the degradable plastic sample is adsorbed on the top of the tray 301 and the support ring 302 by the negative pressure.

[0033] Then, the air pump 203 is used to suck air, so that the air circulates between the detection box 100, the fixed cover 201 and the connecting pipe 202, and the heating wire 204 is used to heat the air. At the same time, the temperature sensor 205 is used to monitor the temperature inside the detection box 100 in real time to know the temperature during the stress whitening detection of the degradable plastic sample.

[0034] The output shaft of the cylinder 500 extends to drive the pressure rod 602 to press on the degradable plastic sample. As the output shaft of the cylinder 500 extends, the pressure rod 602 and the sleeve 601 slide relative to each other, and the spring 603 is gradually compressed. At the same time, the pointer 605 slides in the guide groove 604 and indicates the pressure length of the spring 603 on the length scale 606, so as to control the pressure of the pressure rod 602 on the degradable plastic.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature environmental stress testing device for degradable plastics, comprising a detection box (100), characterized in that: A temperature control component (200) is fixedly installed on the surface of the detection box (100), a negative pressure adsorption component (300) is fixedly installed on the bottom wall of the detection box (100), an air extraction component (400) is fixedly installed at the bottom of the detection box (100), the negative pressure adsorption component (300) is used to place the degradable plastic sample, the air extraction component (400) is used to suck the air between the negative pressure adsorption component (300) and the degradable plastic sample, a cylinder (500) is fixedly installed on the top of the detection box (100), and an elastic pressing head component (600) is fixedly installed at the output end of the bottom of the cylinder (500).

2. The high-temperature environmental stress testing device for degradable plastics according to claim 1, wherein: A box door (101) is hinged to the front side of the detection box (100), an observation window (102) is arranged on the surface of the box door (101), ventilation openings (103) are formed on both sides of the detection box (100), and the ventilation openings (103) are communicated with the temperature control component (200).

3. The high-temperature environmental stress testing device for degradable plastics according to claim 2, characterized in that: The temperature control component (200) includes two fixed covers (201) fixedly installed on both sides of the detection box (100), the detection box (100) is communicated with the fixed covers (201) through the ventilation openings (103), a connecting pipe (202) is fixedly installed between the two fixed covers (201), an air pump (203) is arranged on the connecting pipe (202), and a heating wire (204) is fixedly installed in one of the fixed covers (201).

4. The high-temperature environmental stress testing device for degradable plastics according to claim 3, characterized in that: The negative pressure adsorption component (300) includes a tray (301) and a retaining ring (302) fixedly installed on the bottom wall of the detection box (100), the tray (301) and the retaining ring (302) are concentrically arranged, an annular groove is formed between the tray (301) and the retaining ring (302), a gas guiding groove (303) is formed at the center of the bottom of the tray (301), and communication holes (304) are arranged in an array on the side surface of the tray (301), and both ends of the communication holes (304) are communicated with the gas guiding groove (303) and the annular groove respectively.

5. The high-temperature environmental stress testing device for degradable plastics according to claim 4, wherein: The air extraction component (400) includes a piston cylinder (401) fixedly installed at the bottom of the detection box (100), a limiting ring (402) is fixedly installed on the inner wall of the piston cylinder (401), the piston cylinder (401) is divided into a left half part and a right half part by the limiting ring (402), an air hole (403) is formed in the right half part of the piston cylinder (401), a through hole is formed through the bottom of the detection box (100), the air hole (403), the gas guiding groove (303) and the through hole are communicated, a piston plate (404) is slidably connected in the left half part of the piston cylinder (401), a threaded rod (405) is rotatably connected to the left side of the piston plate (404), a threaded hole (406) is formed at the left end of the piston cylinder (401), and the threaded rod (405) is in threaded connection with the threaded hole (406).

6. The high-temperature environmental stress testing device for degradable plastics according to claim 1, wherein: The elastic pressing head component (600) includes a sleeve (601) fixedly installed at the output end of the bottom of the cylinder (500), a pressing rod (602) is slidably connected through the bottom of the sleeve (601), and a spring (603) is fixedly installed between the top end of the pressing rod (602) and the top wall of the sleeve (601).

7. The high-temperature environmental stress testing device for degradable plastics according to claim 6, wherein: The surface of the sleeve (601) is penetrated and provided with a guiding groove (604). A pointer (605) is fixedly installed on the side surface of the top end of the pressure rod (602). The pointer (605) is slidably connected through the guiding groove (604). Length scales (606) are arranged on both sides of the guiding groove (604) on the surface of the sleeve (601).

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