Device for detecting deformation resistance strength of PLA (polylactic acid) tube

Abstract

The utility model discloses a PLA (polylactic acid) tube deformation resistance strength detection device, and relates to the technical field of PLA tube detection equipment. The supporting frame is arranged on the side face of the base, a telescopic rod is arranged at the upper end of the supporting frame and connected with a fixing plate, and a pressing head is arranged on the bottom face of the fixing plate; the fixing frame is arranged on the top face of the base, the fixing frame is used for placing a PLA tube, the PLA tube is arranged under the pressing head, and the dynamometer is arranged on the top face of the fixing plate. The detection device for the deformation resistance strength of the PLA tube solves the technical problems that an existing detection device for the deformation resistance strength of the PLA tube is difficult to detect the PLA tube under a high-temperature condition, and the error of a test result is relatively large, and the PLA tube subjected to heat preservation in a water bath is placed on the fixing frame to be fixed; after the pressure head is driven by the telescopic rod to downwards press the PLA tube to move for a certain distance, the position is kept unchanged and maintained for a certain time, the deformation resistance strength of the PLA tube is obtained, the use is simple and rapid, and the test result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of PLA pipe detection equipment, in particular to a device for detecting the deformation resistance strength of PLA pipes. Background Art

[0002] The PLA material is a polyester polymer obtained by polymerizing lactic acid as the main raw material, and is a new type of biodegradable material. The PLA material has good mechanical and physical properties, good ductility, good thermal stability, and good biodegradability. At present, as an environmentally friendly and harmless material, it has excellent performance in the fields of disposable products and biomedicine. The PLA material can be applied in many high-temperature environments. Therefore, after the PLA is made into products, it is necessary to detect the relevant characteristics of PLA-related products. The deformation resistance strength of the PLA material at high temperature is an important detection parameter, which can reflect the stability and durability of the PLA material in extreme environments. At this time, a device for detecting the deformation resistance strength of PLA pipes at high temperature is required for testing.

[0003] However, since the PLA pipe will soften at high temperature, the existing devices for detecting the deformation resistance strength of PLA pipes are difficult to detect the PLA pipe under high-temperature conditions, and the test results have large errors, making it difficult to compare different samples. Therefore, a device for detecting the deformation resistance strength of PLA pipes for solving the above problems is proposed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a device for detecting the deformation resistance strength of PLA pipes, which solves the technical problems that the existing devices for detecting the deformation resistance strength of PLA pipes are difficult to detect the PLA pipe under high-temperature conditions and the test results have large errors.

[0005] To achieve the above purpose, the utility model provides a device for detecting the deformation resistance strength of PLA pipes, including:

[0006] A base;

[0007] A support frame, which is arranged on the side of the base. An expansion rod is arranged at the upper end of the support frame, and the expansion rod is connected to a fixing plate. A pressing head is arranged on the bottom surface of the fixing plate;

[0008] A fixing frame, which is arranged on the top surface of the base. The fixing frame is used for placing the PLA pipe, and the PLA pipe is arranged directly below the pressing head.

[0009] A dynamometer, which is arranged on the top surface of the fixing plate. The upper end surface of the dynamometer abuts against the support frame. The dynamometer is used for detecting the magnitude of the force exerted by the expansion rod on the pressing head.

[0010] Preferably, a rangefinder is provided on the top surface of the fixing plate, and the rangefinder is used to detect the distance that the indenter moves.

[0011] Preferably, the support frame includes: two symmetrically arranged support columns, and limiting holes for passing through the PLA tube are provided on the side surfaces of the two support columns, and the two limiting holes are coaxially arranged.

[0012] Preferably, two fixing seats are symmetrically arranged on the top surface of the base, a transmission lead screw is arranged between the two fixing seats, and the transmission lead screw is threadedly connected to the two support columns respectively.

[0013] Preferably, two thread lines are symmetrically arranged at both ends of the transmission lead screw, and the spiral directions of the two thread lines are opposite.

[0014] Preferably, a guide groove is provided at the bottom end of the support column, and a guide track is provided on the top surface of the base, and the guide track is slidably connected to the guide groove.

[0015] Preferably, two limiting rods are arranged between the fixing seats, and the two limiting rods are slidably connected to the two support columns.

[0016] Preferably, a display screen is provided on the surface of the dynamometer, and the display screen is used to display the data detected by the dynamometer.

[0017] Preferably, a clamping groove is provided on the side surface of the base, a clamping protrusion is provided on the first side of the bottom end of the support frame, and the clamping protrusion is slidably connected to the clamping groove.

[0018] Preferably, a positioning rod is provided on the first side of the bottom end of the support frame, the positioning rod is threadedly connected to the support frame, and the positioning rod penetrates through the clamping protrusion.

[0019] Compared with the above background art, a PLA tube deformation resistance strength detection device provided by the present invention has the following beneficial effects: placing the PLA tube that has been kept warm in a water bath on the fixing frame for fixation, adjusting the height of the indenter through the telescopic rod until the indenter contacts the outer wall of the PLA tube. After the bottom end of the indenter just contacts the outer wall of the PLA tube, the telescopic rod drives the indenter to move vertically downward by a certain distance and then keeps the position unchanged and maintains for a certain period of time until the reading of the dynamometer remains unchanged, so as to obtain the deformation resistance strength of the PLA tube. It is simple and fast to use, and the test result is more accurate. It can compare the deformation resistance strengths of different PLA tubes and quickly judge the magnitudes of the deformation resistance strengths of different PLA tubes at high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0021] Figure 1 The three-dimensional structure diagram of the detection device provided by the embodiment of the present invention;

[0022] Figure 2 The cross-sectional schematic diagram of the detection device provided by the embodiment of the present invention.

[0023] Specifically, 1 - base, 101 - card slot; 2 - support column; 201 - clamping protrusion; 3 - telescopic rod; 4 - fixing plate; 5 - pressing head; 6 - support frame; 7 - PLA tube; 8 - dynamometer; 9 - rangefinder; 901 - pulling rod; 10 - fixing seat; 11 - transmission lead screw; 12 - guiding track; 13 - limiting rod; 14 - positioning rod. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the 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 of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] To enable those skilled in the art of this technology to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0026] As Figure 1 and Figure 2 shown, to achieve the above object, the present invention provides a detection device for the resistance deformation strength of a PLA tube, including: a base 1 and a support frame 6 and a fixing frame arranged on the base 1.

[0027] Among them, a support frame 6 is arranged on the right side of the base 1. An upper end portion of the support frame 6 is provided with a telescopic rod 3. Preferably, the telescopic rod 3 adopts an electric push rod. The telescopic rod 3 is connected to a fixing plate 4. A pressing head 5 is provided on the bottom surface of the fixing plate 4. The lifting of the fixing plate 4 can be controlled by the electric push rod, and the fixing plate 4 drives the pressing head 5 to lift and lower synchronously.

[0028] A fixing bracket is provided on the top surface of the base 1. The fixing bracket is used to place the PLA tube 7. The PLA tube 7 is arranged directly below the indenter 5. After the indenter 5 is driven by the telescopic rod 3 to descend a certain distance, it can just abut against the highest point of the outer wall of the PLA tube 7. When the electric push rod drives the fixed plate 4 to descend further and the fixed plate 4 drives the indenter 5 to move up and down synchronously, it is ensured that the PLA tube 7 can be bent vertically downward. It should be noted that the diameter of the PLA tube 7 is 15 mm, and the diameter of the indenter 5 is not less than 15 mm, and the material hardness is not less than 100 HV, so as to avoid the influence of the performance of the indenter 5 itself on the experimental results.

[0029] In addition, a dynamometer 8 is provided on the top surface of the fixed plate 4. The upper end surface of the dynamometer 8 abuts against the support frame 6. Further, a pressure sensor is provided at the connection position between the indenter 5 and the fixed plate 4. The pressure sensor wire is connected to the dynamometer 8. The force received by the indenter 5 will be transmitted to the pressure sensor, and the pressure sensor will feedback the magnitude of the force to the dynamometer 8. Through the dynamometer 8, the magnitude of the force applied by the telescopic rod 3 to the indenter 5 can be accurately detected, so as to obtain the deformation resistance strength of the PLA tube 7.

[0030] During use, the PLA tube 7 that has been kept warm in a water bath is placed on the fixing bracket for fixation. The height is adjusted through the telescopic rod 3 until the indenter 5 contacts the outer wall of the PLA tube 7. After the bottom end of the indenter 5 just contacts the outer wall of the PLA tube 7, the telescopic rod 3 applies a downward force to the outer wall of the PLA tube 7 by pressurization. The telescopic rod 3 drives the fixed plate 4 to descend, and the fixed plate 4 drives the indenter 5 to descend synchronously by a certain distance. The PLA tube 7 bends vertically downward under the action of the indenter 5. The position of the indenter 5 remains unchanged and is maintained for a certain period of time until the reading of the dynamometer 8 remains unchanged, so as to obtain the deformation resistance strength of the PLA tube 7. It is simple and fast to use, and the test results are more accurate.

[0031] A distance measuring device 9 is provided on the top surface of the fixed plate 4. The distance moved by the indenter 5 is detected through the distance measuring device 9 to assist the operator to make the distance moved by the indenter 5 when pressing the PLA tube 7 each time driven by the electric push rod the same, that is, the bending degree of the PLA tube 7 is the same. In addition, a display dial (not shown in the figure) is provided on the distance measuring device 9. Through the display dial, the distance moved by the indenter 5 can be observed in real time, making it more convenient to use.

[0032] It should be noted that a pull rod 901 is provided at the bottom end of the distance measuring device 9. The bottom end of the pull rod 901 is connected to the top surface of the fixed plate 4. As the fixed plate 4 drives the indenter 5 to descend, the pull rod 901 will extend the same length synchronously. The length extended by the pull rod 901 is the distance that the indenter 5 descends.

[0033] The support frame 6 includes: two symmetrically arranged support columns 2, and the sides of the two support columns 2 are provided with limiting holes for passing the PLA tube 7. Since the diameter of the PLA tube 7 is 15 mm, the diameter of the limiting hole is not less than 15 mm. The two limiting holes are coaxially arranged. When fixing the PLA tube 7, the two ends of the PLA tube 7 can be respectively inserted into the two ends of the limiting holes. It should be noted that the two ends of the PLA tube 7 must extend to the outside of the support column 2. When the pressure head 5 drops a certain distance and causes the PLA tube 7 to bend, the two ends of the PLA tube 7 will not be separated from the limiting holes, so as to ensure the orderly progress of the PLA tube 7 detection process.

[0034] In one embodiment of the utility model, two fixed seats 10 are symmetrically arranged on the top surface of the base 1, and a transmission screw 11 is arranged between the two fixed seats 10, and the transmission screw 11 is respectively threadedly connected to the two support columns 2. It should be noted that the two ends of the transmission screw 11 are rotatably connected to the fixed seats 10, and a turntable is arranged at the right end of the transmission screw 11. A rotating handle is arranged on the right side of the turntable. The rotating handle drives the turntable to rotate, and drives the transmission screw 11 to rotate. The rotation of the transmission screw 11 can drive the two support columns 2 to move left and right relative to the base 1.

[0035] It should be further explained that two threads are symmetrically arranged at the two ends of the transmission screw 11, and the spiral directions of the two threads are opposite, so as to ensure that when the transmission screw 11 is rotated in the forward direction, the two support columns 2 can move away from each other to adapt to the detection of the resistance to deformation strength of the longer PLA tube 7, and when the transmission screw 11 is rotated in the reverse direction, the two support columns 2 can move closer to each other to adapt to the detection of the resistance to deformation strength of the shorter PLA tube 7. The overall device has a wider range of uses and is more practical.

[0036] In addition, a guide groove is provided at the bottom end of the support column 2, and a guide track 12 is provided on the top surface of the base 1. The guide track 12 is slidably connected to the guide groove. Through the sliding cooperation between the guide groove and the guide track 12, the movement path of the support column 2 can be corrected, and at the same time, a certain limiting effect can be played on the support column 2, thereby improving the stability of the connection between the support column 2 and the base 1, thereby ensuring the stability of the PLA tube 7 being fixed, and ensuring the reliability of the deformation resistance strength test results of the PLA tube 7.

[0037] Furthermore, two limit rods 13 are arranged between the fixing seats 10, and the two limit rods 13 are slidably connected to the two support columns 2. The limit rods 13 are mainly used to further limit the support columns 2, thereby improving the stability of the support columns 2 when they cooperate with the guide rails 12, and can avoid the deflection of the support columns 2, thereby ensuring the stability of the PLA tube 7 being fixed.

[0038] A display screen (not shown in the figure) is provided on the surface of the dynamometer 8. The display screen is used to display the data detected by the dynamometer 8, that is, the magnitude of the force exerted on the PLA tube 7 by the indenter 5. By observing the magnitude of the force exerted on the PLA tube 7 by the indenter 5 in real time through the display screen, the deformation resistance strength of the PLA tube 7 at high temperature can be intuitively obtained.

[0039] In an embodiment of the present utility model, a card slot 101 is provided on the right side of the base 1. The length direction of the card slot 101 is consistent with the axial direction of the limiting hole. A clamping protrusion 201 is provided on the first side of the bottom end of the support frame 6. The clamping protrusion 201 is slidably connected to the card slot 101, that is, the clamping protrusion 201 can freely slide within the card slot 101. The support frame 6 can move freely in the width direction of the base 1, so as to be able to flexibly adjust the position of the indenter 5 above the PLA tube 7 to adapt to more detection methods and improve the practicability of the overall detection device.

[0040] In addition, a positioning rod 14 is provided on the first side of the bottom end of the support frame 6. The positioning rod 14 is threadedly connected to the support frame 6 and passes through the clamping protrusion 201. The position of the support frame 6 on the base 1 is locked by the positioning rod 14. Further, when the positioning rod 14 is screwed forward, the left end of the positioning rod 14 passes through the clamping protrusion 201 and abuts against the side surface of the card slot 101 to lock the position of the support frame 6 on the base 1. When the positioning rod 14 is screwed backward, one end of the positioning rod 14 enters the clamping protrusion 201, and the support frame 6 loses effective limitation and can freely adjust the position of the support frame 6 on the base 1.

[0041] It should be noted that when the PLA tube 7 is subjected to water bath heat preservation, the water bath temperature is the same as the actual working temperature of the PLA tube 7. Since the ambient temperature of the PLA tube 7 during actual application is 60 - 80 °C, the ambient temperature of the PLA tube 7 during actual application is 60 - 80 °C, which can further improve the accuracy of the test results and make the overall detection more meaningful. Moreover, the water bath heat preservation time is not less than 30 min, which can ensure that the PLA tube 7 is evenly heated, improve the stability of the experimental results, and make the detection results more persuasive. Among them, the diameter of the PLA tube 7 is taken as 15 mm, and the wall thickness of the PLA tube 7 is 0.4 - 0.6 mm, which can adapt to the actual size of the PLA tube 7 used as a low-temperature cigarette filter tip. At the same time, after the indenter 5 presses down the PLA tube 7 by a certain distance, the holding time is not less than 5 min, which further makes the detection results more persuasive.

[0042] Example 1: The diameter of the PLA tube 7 is taken as 15 mm, the wall thickness of the PLA tube 7 is 0.5 mm, the diameter of the indenter 5 is 15 mm, the hardness is 100 HV, and the diameter of the limiting hole is 15 mm. After placing the PLA tube 7 in a water bath at 60 °C for heat preservation for 30 min, then place the PLA tube 7 on the fixing rack for fixation. Adjust the height through the telescopic rod 3 until the indenter 5. After the bottom end of the indenter 5 just touches the outer wall of the PLA tube 7, at this time, there is no interaction force between the indenter 5 and the PLA tube 7. The telescopic rod 3 drives the indenter 5 to move vertically downward by 3 mm. At this time, the contact position between the PLA tube 7 and the indenter 5 is pressed down by 3 mm. Keep the position of the indenter 5 unchanged and maintain it for 5 min until the reading of the dynamometer 8 remains unchanged. Read the reading F1 of the dynamometer 8, which is the resistance to deformation strength of the PLA tube 7 at 60 °C.

[0043] Example 2: The diameter of the PLA tube 7 is taken as 15 mm, the wall thickness of the PLA tube 7 is 0.6 mm, the diameter of the indenter 5 is 20 mm, the hardness of the indenter 5 is 120 HV, and the diameter of the limiting hole is 16 mm. After placing the PLA tube 7 in a water bath at 80 °C for heat preservation for 40 min, then place the PLA tube 7 on the fixing rack for fixation. Adjust the height through the telescopic rod 3 until the indenter 5. After the bottom end of the indenter 5 just touches the outer wall of the PLA tube 7, at this time, there is no interaction force between the indenter 5 and the PLA tube 7. The telescopic rod 3 drives the indenter 5 to move vertically downward by 3 mm. At this time, the contact position between the PLA tube 7 and the indenter 5 is pressed down by 3 mm. Keep the position of the indenter 5 unchanged and maintain it for 5 min until the reading of the dynamometer 8 remains unchanged. Read the reading F2 of the dynamometer 8, which is the resistance to deformation strength of the PLA tube 7 at 60 °C.

[0044] In summary, through the above Example 1 and Example 2, the PLA tubes 7 of different specifications and models are respectively detected, and the resistance to deformation strength of different PLA tubes 7 under different detection conditions can be quickly judged. The overall detection device is simple and fast to use, the test results are more accurate, and the resistance to deformation strength of different PLA tubes 7 can be compared. Moreover, the test can be carried out at the temperature in the actual working environment of the PLA tube 7, the measurement error is small, the test results are easy to compare, and the resistance to deformation strength of different PLA tubes 7 at high temperature can be clearly judged.

[0045] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0046] In this text, specific examples are used to illustrate the principle and implementation mode of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A detection device for the deformation resistance strength of a PLA tube, characterized in that, Comprising: Base; Support frame, arranged on the side of the base, a telescopic rod is arranged at the upper end of the support frame, the telescopic rod is connected to a fixed plate, and a pressing head is arranged on the bottom surface of the fixed plate; Fixed frame, arranged on the top surface of the base, the fixed frame is used for placing a PLA tube, and the PLA tube is arranged directly below the pressing head; Force gauge, arranged on the top surface of the fixed plate, the upper end surface of the force gauge abuts against the support frame, and the force gauge is used for detecting the magnitude of the force applied by the telescopic rod to the pressing head.

2. The PLA pipe deformation resistance strength detection device according to claim 1, characterized in that, A distance measuring device is arranged on the top surface of the fixed plate, and the distance measuring device is used for detecting the distance that the pressing head moves.

3. The PLA tube deformation resistance strength detection device according to claim 1, characterized in that, The support frame includes: two symmetrically arranged support columns, and limiting holes for passing through the PLA tube are arranged on the sides of the two support columns, and the two limiting holes are coaxially arranged.

4. A PLA tube deformation resistance strength detection device according to claim 3, characterized in that, Two fixed seats are symmetrically arranged on the top surface of the base, a transmission lead screw is arranged between the two fixed seats, and the transmission lead screw is respectively threadedly connected to the two support columns.

5. The PLA tube deformation resistance strength detection device according to claim 4, characterized in that, Two thread lines are symmetrically arranged at both ends of the transmission lead screw, and the spiral directions of the two thread lines are opposite.

6. The PLA pipe deformation resistance strength detection device according to claim 5, characterized in that, A guide groove is arranged at the bottom end of the support column, and a guide track is arranged on the top surface of the base, and the guide track is slidably connected to the guide groove.

7. An apparatus for detecting the deformation resistance strength of a PLA tube according to claim 6, characterized in that, Two limiting rods are arranged between the fixed seats, and the two limiting rods are slidably connected to the two support columns.

8. A PLA tube deformation resistance strength detection device according to any one of claims 1-7, characterized in that, A display screen is arranged on the surface of the force gauge, and the display screen is used for displaying the data detected by the force gauge.

9. A device for detecting the deformation resistance strength of a PLA tube according to any one of claims 1-7, characterized in that, A clamping groove is arranged on the side of the base, a clamping protrusion is arranged on the first side of the bottom end of the support frame, and the clamping protrusion is slidably connected to the clamping groove.

10. The detecting device for the deformation resistance strength of a PLA pipe according to claim 9, wherein, A positioning rod is arranged on the first side of the bottom end of the support frame, the positioning rod is threadedly connected to the support frame, and the positioning rod penetrates through the clamping protrusion.

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