Plastic bottle limit testing method and system, plastic limit testing bench

Abstract

The present invention discloses a plastic bottle limit testing method, in which a plastic bottle filled with a liquid indicator is placed upside down in a liquid environment medium for testing. The present invention discloses a plastic limit testing system, including a plastic limit testing platform, a cold and hot source component, a monitoring and stop component, and a controller. The present invention discloses a plastic bottle limit testing platform, including a box, a rocker arm component, a hydraulic cylinder component, and a test tube component. The present invention provides a plastic bottle limit testing method, which can more conveniently perform tests on plastic bottles under extreme conditions; at the same time, the present invention also provides a plastic limit testing system with multiple working modes to simulate more harsh conditions to complete plastic bottle limit testing. At the same time, the present invention also provides a plastic bottle limit testing platform, which is used for loading plastic bottles and liquid environment media and changing the active state of plastic bottles, and has the characteristics of simple structure and fast loading.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic bottles, and in particular to a plastic bottle limit testing method and system, and a plastic limit testing platform. Background Art

[0002] Plastic bottles are widely made of polyester (PET), polyethylene (PE), and polypropylene (PP) as raw materials, with corresponding additives added. After being heated at high temperature, they are blow molded, extruded, or injection molded through plastic molds. They are mainly used for filling and storing liquids or solids such as beverages, foods, pickles, honey, dried fruits, edible oils, pesticides and veterinary drugs. They have the characteristics of not being easy to break, low cost, high transparency, and being made of food-grade raw materials.

[0003] The sealing performance and quality of plastic bottles significantly impact the quality of the substances they contain. Currently, most existing testing devices can only test the sealing performance and quality of plastic bottles under normal conditions. Therefore, they cannot predict the performance of plastic bottles in harsh environments. Summary of the Invention

[0004] To overcome the problems of the prior art, the present invention provides a plastic bottle limit testing method that can conveniently test plastic bottles under extreme conditions. Furthermore, the present invention provides a plastic limit testing system with multiple operating modes that simulates relatively harsh conditions to complete plastic bottle limit testing. Furthermore, the present invention provides a plastic bottle limit testing platform for loading plastic bottles and liquid environmental media and changing the active state of plastic bottles, featuring a simple structure and fast loading.

[0005] The technical solution adopted in the present invention is:

[0006] Plastic bottle limit test method, the steps include:

[0007] S1. Encapsulate the liquid indicator in a plastic bottle;

[0008] S2. Place the plastic bottle from the previous step upside down in the liquid environment medium;

[0009] S3. Change the temperature of the liquid environment medium and / or the activity state of the plastic bottle to simulate extreme test conditions;

[0010] S4. Monitor the changes in the properties of the liquid environment medium. When the properties of the liquid environment medium change significantly at a certain moment, stop the test.

[0011] Plastic bottle limit testing system, including:

[0012] Plastic limit test bench, used for loading plastic bottles and liquid environmental media, and changing the activity state of plastic bottles;

[0013] A cold and hot source assembly connected to the plastic limit test bench and used to change the temperature of the liquid environment medium loaded in the test bench;

[0014] A monitoring and stop-and-detect component connected to the plastic limit test bench for monitoring property changes of the liquid environment medium loaded in the test bench;

[0015] The controller communicates with the plastic limit test bench, the cold and hot source components and the monitoring and detection and stop components, and is configured to switch and implement working modes, as well as monitor and record.

[0016] Furthermore, the cold and heat source components include:

[0017] Heat source, used to increase the temperature of the liquid ambient medium;

[0018] Cold source, used to reduce the temperature of the liquid ambient medium;

[0019] An electromagnetic three-way valve, one passage of which is connected to the plastic limit test bench, and the remaining two passages are connected to the heat source and the cold source, and is used to switch and change the temperature of the liquid environment medium.

[0020] Furthermore, the monitoring and stop detection component includes a temperature sensor and a pH meter, and the temperature sensor and the pH meter extend into the liquid environment medium.

[0021] Furthermore, the monitoring and stop detection component includes a temperature sensor, two electrodes, a 5V power supply, a switch and an indicator light. The temperature sensor and the electrodes are inserted into the liquid environment medium. The two electrodes, the 5V power supply, the switch and the indicator light are connected in series to form a conductive circuit. When the conductive circuit is closed, the indicator light is on, otherwise it is off.

[0022] Plastic limit test bench, including:

[0023] The box body has a waist-shaped hole and a support seat, and the support seat is located on both sides of the waist-shaped hole in the length direction;

[0024] A rocker arm assembly is inserted into the waist-shaped hole and connected to the support seat, with one end extending into the box body;

[0025] A hydraulic cylinder assembly is mounted on the box body and is hinged to one end of the rocker arm assembly extending into the box body;

[0026] A test cylinder assembly comprises a test cylinder, a cylinder cover, a loading cylinder with a porous bottom, and a heat exchange element, and is connected to one end of the rocker arm assembly located outside the housing; the test cylinder is provided with a monitoring hole; the loading cylinder is connected to the side of the cylinder cover facing the test cylinder; the heat exchange element is located in the test cylinder, and its inlet and outlet ends extend outside the test cylinder.

[0027] Furthermore, the rocker arm assembly includes:

[0028] A rocker arm is inserted into the waist-shaped hole;

[0029] a first pin passing through the support seat and the rocker arm;

[0030] A connecting circular plate is connected to one end of the rocker arm located outside the box; and the connecting circular plate is connected to the bottom flange of the test cylinder.

[0031] Furthermore, the loading cylinder is threadedly connected to the cylinder cover, its inner diameter is larger than the largest diameter of the plastic bottle to be loaded therein, its depth is larger than the height of the plastic bottle, and its outer bottom surface is 1 to 5 cm away from the inner bottom surface of the testing cylinder.

[0032] Furthermore, the heat exchange element is spiral-shaped.

[0033] Plastic bottle limit testing system, including:

[0034] The aforementioned plastic limit test bench is used to load plastic bottles and liquid environmental media, and to change the active state of the plastic bottles;

[0035] A cold and hot source assembly connected to the plastic limit test bench and used to change the temperature of the liquid environment medium loaded in the test bench;

[0036] A monitoring and stop-and-detect component connected to the plastic limit test bench for monitoring property changes of the liquid environment medium loaded in the test bench;

[0037] The controller communicates with the plastic limit test bench, the cold and hot source components and the monitoring and detection and stop components, and is configured to switch and implement working modes, as well as monitor and record.

[0038] The beneficial effects of the present invention are:

[0039] 1. The present invention provides a plastic bottle limit testing method. This method involves encapsulating a liquid indicator in a plastic bottle and then placing the entire bottle in a liquid environment. By varying the liquid environment temperature and / or the activity of the plastic bottle, extreme test conditions are simulated to test the sealability and quality of the plastic bottle. This method is simple to operate and easy to implement.

[0040] 2. This invention provides a plastic limit testing system, comprising a plastic limit testing platform, a heat and cold source assembly, a monitoring and stop-and-go assembly, and a controller. This system can simulate demanding conditions to perform limit testing on plastic bottles, providing guidance for research into improving the quality and sealing properties of plastic bottles.

[0041] 3. The present invention also provides a plastic bottle extreme test bench, which is composed of a box body, a rocker arm assembly, a hydraulic cylinder assembly and a test tube assembly, etc., and is used for loading plastic bottles and liquid environmental media, and changing the activity state of plastic bottles. In conjunction with other components, it can simulate extreme conditions and conduct plastic bottle tests, which is beneficial to improving the sealing and quality of plastic bottles. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 Schematic diagram of the plastic bottle limit test bench in Example 1 of the present invention Figure 1 .

[0044] Figure 2 Schematic diagram of the plastic bottle limit test bench in Example 1 of the present invention Figure 2 .

[0045] Figure 3 This is a schematic diagram of the rocker arm assembly in Example 1 of the present invention.

[0046] Figure 4 This is a schematic diagram of a test tube in Example 1 of the present invention.

[0047] Figure 5 This is a schematic diagram of the cylinder cover in Example 1 of the present invention.

[0048] Figure 6 This is a schematic diagram of a loading cylinder in Example 1 of the present invention.

[0049] Figure 7 This is a logical connection diagram of the plastic bottle limit testing system in Example 2 of the present invention.

[0050] Figure 8 This is a logical connection diagram of the plastic bottle limit testing system in Example 3 of the present invention. DETAILED DESCRIPTION

[0051] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0053] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0054] The present invention / embodiments of the invention are described in detail below with reference to the accompanying drawings. Example 1

[0055] Plastic bottle limit test bench, its structure is as shown in the attached Figure 1 and 2 The plastic bottle limit test bench 10 comprises a box body 11 , a rocker arm assembly 12 , a hydraulic cylinder assembly 13 and a test cylinder assembly 14 .

[0056] Specifically, the box body 11 is hollow inside. A waist-shaped hole 111 is formed on the top surface of the box body 11. Support bases 112 are respectively provided on both sides of the waist-shaped hole 111 in the longitudinal direction. The two support bases 112 are arranged in parallel, and their lower ends are perpendicularly connected to the top surface of the box body 11.

[0057] The rocker arm assembly 12 is inserted into the waist-shaped hole 111 at the top of the box body 11. The rocker arm assembly 12 includes a rocker arm rod 121, a first pin 122 and a connecting circular plate 123. Figure 3 shown.

[0058] In this embodiment, the rocker arm 121 passes through the waist-shaped hole 111, with one end located outside the box body 11 and the other end located inside the box body 11. A first pin hole 1211 is opened along the thickness direction of the rocker arm 121 in the middle of the length direction of the rocker arm 121 and at the end located inside the box body 11.

[0059] In this embodiment, the first pin shaft 122 passes through the first pin hole 1211 in the middle of the length direction of the rocker arm 121, and its two ends pass through the upper part of the support seat 112. This structure enables the rocker arm 121 to deflect and swing with the connection point between the first pin shaft 122 and the support seat 112 as the fulcrum.

[0060] In this embodiment, the center of one side surface of the connecting circular plate 123 is vertically connected to one end of the rocker arm 121 located outside the box body 11. A plurality of through holes 1231 are opened on the edge of the connecting circular plate 123.

[0061] The hydraulic cylinder assembly 13 is installed inside the housing 11 and is connected to the rocker arm assembly 12 to drive the rocker arm assembly 12 to swing back and forth. The hydraulic cylinder assembly 13 includes a hydraulic cylinder body 131, a piston rod 132, a U-shaped piece 133 and a second pin 134.

[0062] In this embodiment, the hydraulic cylinder body 131 is connected to the inner wall of the housing 11, with a U-shaped member 133 located at the free end of the piston rod 132. The end of the rocker lever 121 located within the housing 11 is inserted into the groove inside the U-shaped member 133, and a second pin 134 passes through the U-shaped member 133 and the rocker lever 121. With this structure, the reciprocating movement of the piston rod 132 of the hydraulic cylinder body 131 drives the rocker lever 121 to deflect and oscillate, with the connection point between the first pin 122 and the support base 112 serving as the fulcrum.

[0063] The test cylinder assembly 14 is connected to the connecting circular plate 123 of the rocker arm assembly 12 . The test cylinder assembly 14 includes a test cylinder 141 , a cylinder cover 142 , a loading cylinder 143 and a heat exchange member 144 .

[0064] In this embodiment, the testing tube 141 is open at the top and closed at the bottom. Figure 4 As shown, flanges 1411 are formed on the top and bottom of the test cylinder 141. Several monitoring holes 1412 are provided on the sidewalls of the test cylinder 141 for connecting testing instruments. Bolts (not shown) are inserted through the flanges 1411 at the bottom of the test cylinder 141 and the through holes 1231 on the edge of the connecting circular plate 123 to secure the entire test cylinder assembly 14 to the connecting circular plate 123.

[0065] In this embodiment, the cylinder cover 142 is located on the top of the test cylinder 141, and its edge is connected to the flange edge 1411 on the top of the test cylinder 141 by bolts. Figure 5 As shown, a hollow cylindrical portion 1421 is formed at the center of the side of the cylinder cover 142 facing the test cylinder 141, and an internal thread is formed on the inner wall of the hollow cylindrical portion 1421. A safety valve 1422 is installed on the cylinder cover 142 to prevent safety accidents caused by excessive pressure during testing.

[0066] In this embodiment, the loading cylinder 143 is in the shape of a cylinder with a bottom, and a plurality of flow holes are provided on its side wall and bottom wall. Figure 6 As shown. The outer wall of the open end of the loading cylinder 143 is provided with external threads that mate with the internal threads of the hollow cylindrical portion 1421, allowing the loading cylinder 143 to be threadedly connected to the cylinder cap 142. The inner diameter of the loading cylinder 143 is larger than the largest diameter of the plastic bottle to be loaded, meaning that the plastic bottle can freely move within the loading cylinder 143. The depth of the loading cylinder 143 is greater than the height of the plastic bottle. The bottom surface of the loading cylinder 143 is 1-5 cm from the bottom surface of the testing cylinder 141.

[0067] In this embodiment, heat exchange element 144 is located within test cylinder 141 and is spiral-shaped. Its inlet and outlet extend through the sidewalls of test cylinder 141 and out of test cylinder 141. Heat exchange element 144 can be used to change the temperature within test cylinder 141 to simulate extreme conditions and test the sealing and quality of plastic bottles.

[0068] In this embodiment, the working mode of the plastic bottle limit test bench is:

[0069] Fill the plastic bottle with a predetermined amount of liquid indicator according to its rated capacity, then seal and cap it according to the normal process. The plastic bottle is then inverted, with the bottle mouth facing downward, into the loading cylinder 143 and threaded onto the cylinder cap 142. After the test cylinder 141 is filled with 4 / 5 of the liquid environment medium, the cylinder cap 142 is installed. The temperature of the liquid environment medium in the test cylinder is changed by the heat exchanger 144 to complete the test under static extreme conditions. By activating the hydraulic cylinder body 131, the test cylinder assembly 14 will reciprocate with the rocker arm assembly 12, completing the test under dynamic extreme conditions. Example 2

[0070] The plastic bottle limit test system, its structure is as shown in the attached Figure 7 The plastic bottle testing system includes a plastic bottle limit testing platform 10, a cold and hot source component 20, a monitoring and stop detection component 30 and a controller 40.

[0071] Specifically, the plastic bottle limit test bench 10 includes a box body 11 , a rocker arm assembly 12 , a hydraulic cylinder assembly 13 and a test cylinder assembly 14 .

[0072] In this embodiment, the housing 11 is hollow. A waist-shaped hole 111 is formed on the top surface of the housing 11. Support blocks 112 are provided on either side of the waist-shaped hole 111 in the longitudinal direction. The two support blocks 112 are arranged in parallel, with their lower ends perpendicularly connected to the top surface of the housing 11.

[0073] The rocker arm assembly 12 is inserted into the waist-shaped hole 111 on the top of the box body 11. The rocker arm assembly 12 includes a rocker arm rod 121, a first pin shaft 122 and a connecting circular plate 123.

[0074] In this embodiment, the rocker arm 121 passes through the waist-shaped hole 111, with one end located outside the box body 11 and the other end located inside the box body 11. A first pin hole 1211 is opened along the thickness direction of the rocker arm 121 in the middle of the length direction of the rocker arm 121 and at the end located inside the box body 11.

[0075] In this embodiment, the first pin shaft 122 passes through the first pin hole 1211 in the middle of the length direction of the rocker arm 121, and its two ends pass through the upper part of the support seat 112. This structure enables the rocker arm 121 to deflect and swing with the connection point between the first pin shaft 122 and the support seat 112 as the fulcrum.

[0076] In this embodiment, the center of one side surface of the connecting circular plate 123 is vertically connected to one end of the rocker arm 121 located outside the box body 11. A plurality of through holes 1231 are opened on the edge of the connecting circular plate 123.

[0077] The hydraulic cylinder assembly 13 is installed inside the housing 11 and is connected to the rocker arm assembly 12 to drive the rocker arm assembly 12 to swing back and forth. The hydraulic cylinder assembly 13 includes a hydraulic cylinder body 131, a piston rod 132, a U-shaped piece 133 and a second pin 134.

[0078] In this embodiment, the hydraulic cylinder body 131 is connected to the inner wall of the housing 11, with a U-shaped member 133 located at the free end of the piston rod 132. The end of the rocker lever 121 located within the housing 11 is inserted into the groove inside the U-shaped member 133, and a second pin 134 passes through the U-shaped member 133 and the rocker lever 121. With this structure, the reciprocating movement of the piston rod 132 of the hydraulic cylinder body 131 drives the rocker lever 121 to deflect and oscillate, with the connection point between the first pin 122 and the support base 112 serving as the fulcrum.

[0079] The test cylinder assembly 14 is connected to the connecting circular plate 123 of the rocker arm assembly 12 . The test cylinder assembly 14 includes a test cylinder 141 , a cylinder cover 142 , a loading cylinder 143 and a heat exchange member 144 .

[0080] In this embodiment, the test cylinder 141 is open at the top and closed at the bottom. Flanges 1411 are formed on the top and bottom of the test cylinder 141. Several monitoring holes 1412 are provided on the sidewalls of the test cylinder 141 for connecting testing instruments. Bolts (not shown) are inserted through the flanges 1411 at the bottom of the test cylinder 141 and the through holes 1231 on the edge of the connecting circular plate 123 to secure the entire test cylinder assembly 14 to the connecting circular plate 123.

[0081] In this embodiment, a cap 142 is positioned on top of the test tube 141. Its edge is bolted to a flange 1411 at the top of the test tube 141. A hollow cylindrical portion 1421 is formed in the center of the side of the cap 142 facing the test tube 141. The inner wall of the hollow cylindrical portion 1421 is internally threaded. A safety valve 1422 is installed on the cap 142 to prevent accidents caused by excessive pressure during testing.

[0082] In this embodiment, the loading cylinder 143 is cylindrical with a bottom, and its sidewalls and bottom walls are provided with multiple flow holes. The outer wall of the open end of the loading cylinder 143 is provided with external threads that mate with the internal threads of the hollow cylindrical portion 1421, allowing the loading cylinder 143 to be threadedly connected to the cylinder cover 142. The inner diameter of the loading cylinder 143 is larger than the largest diameter of the plastic bottle to be loaded, meaning that the plastic bottle can freely move within the loading cylinder 143. The depth of the loading cylinder 143 is greater than the height of the plastic bottle. The outer bottom surface of the loading cylinder 143 is 1-5 cm away from the inner bottom surface of the testing cylinder 141.

[0083] In this embodiment, heat exchange element 144 is located within test cylinder 141 and is spiral-shaped. Its inlet and outlet extend through the sidewalls of test cylinder 141 and out of test cylinder 141. Heat exchange element 144 can be used to change the temperature within test cylinder 141 to simulate extreme conditions and test the sealing and quality of plastic bottles.

[0084] The hot and cold source assembly 20 is connected to the heat exchanger 144 of the test cylinder assembly 14 to change the temperature inside the test cylinder 141. The hot and cold source assembly 20 includes a heat source 21, a cold source 22, and two electromagnetic three-way valves 23. One passage of the electromagnetic three-way valve 23 is connected to the inlet and outlet of the heat exchanger 144, respectively, and the remaining two passages of the electromagnetic three-way valve 23 are connected to the heat source 21 and the cold source 22. The heat source 21 can be a heating medium such as water vapor or thermal oil with a temperature greater than 100°C that can increase the temperature inside the test cylinder 141. The cold source 22 can be a cooling medium such as salt water with a temperature between 1 and 5°C that can lower the temperature inside the test cylinder. The heat source 21 and the cold source 22 are used individually or alternately to simulate different temperatures to test the sealing and quality of plastic bottles.

[0085] The monitoring and stop assembly 30 monitors the internal conditions of the test cylinder through monitoring hole 1412 and stops the test if the bottle seal is broken or cracked. The monitoring and stop assembly 30 includes a temperature sensor 31, two electrodes 32, a 5V power supply 33, a switch 34, and an indicator light 35. The temperature sensor 31 and two electrodes 32 extend into the test cylinder 141 through monitoring hole 1412. The two electrodes 32, 5V power supply 33, switch 34, and indicator light 35 are connected in series to form a conductive circuit. When the conductive circuit is closed, the indicator light 35 illuminates; otherwise, it turns off.

[0086] The controller 40 communicates with the plastic bottle extreme test bench 10, the heat and cold source assembly 20, and the monitoring and stop / detection assembly 30, and controls their operation. The controller 40 in this embodiment utilizes a commercially available product, such as an industrial computer, or prior art prior to the filing date of this application, without structural modification. The corresponding control program is adaptively adjusted based on the connected components. In this embodiment, the controller 40 is configured to monitor the temperature within the test cylinder 141, the switching between the heat source 21 and the cold source 22, the start / stop and stroke control of the hydraulic cylinder body 131, and the recording of test time.

[0087] In this embodiment, the plastic bottle limit test system has the following working modes:

[0088] (1) Low temperature (0~40℃) static mode;

[0089] (2) Low temperature dynamic mode;

[0090] (3) High temperature (41~100℃) static mode;

[0091] (4) High temperature dynamic mode;

[0092] (5) Variable temperature (temperature 0~100~0℃ cyclic change) static mode;

[0093] (6) Temperature-variable dynamic mode;

[0094] (7) Mixed mode (i.e. the above modes are used alternately).

[0095] In this embodiment, distilled water is used as the liquid environmental medium and filled in the test cylinder. A sodium chloride solution with a mass concentration of 40-50% is used as a liquid indicator and is encapsulated in a plastic bottle. Taking the low-temperature dynamic mode (2) as an example, the controller 40 controls the cold source 22 to be injected into the heat exchanger 144, so that the temperature in the test cylinder 141 is reduced to 5-10°C. At the same time, the controller 40 controls the hydraulic cylinder body 131 to work and drive the test cylinder assembly 14 to swing back and forth. The plastic bottle repeatedly collides with the inner wall of the loading cylinder 143 in a low-temperature environment in the loading cylinder 143. When the seal of the plastic bottle is damaged or the bottle is broken, the electrolyte solution originally loaded will flow out to form a conductive liquid, and the conductive circuit of the two electrodes 32, the 5V power supply 33, the switch 34 and the indicator light 35 will be connected, the test will stop, and the limit test under this condition will be completed.

[0096] The testing process for other modes is similar to the above process.

[0097] The plastic bottle limit testing system in this embodiment can simulate relatively harsh conditions to complete the plastic bottle limit testing, which has guiding significance for improving the quality of plastic bottles and the research on their sealing properties. Example 3

[0098] The plastic bottle limit test system, its structure is as shown in the attached Figure 8 The plastic bottle testing system includes a plastic bottle limit testing platform 10, a cold and hot source component 20, a monitoring and stop detection component 30 and a controller component 40.

[0099] Specifically, the plastic bottle limit test bench 10 includes a box body 11 , a rocker arm assembly 12 , a hydraulic cylinder assembly 13 and a test cylinder assembly 14 .

[0100] In this embodiment, the housing 11 is hollow. A waist-shaped hole 111 is formed on the top surface of the housing 11. Support blocks 112 are provided on either side of the waist-shaped hole 111 in the longitudinal direction. The two support blocks 112 are arranged in parallel, with their lower ends perpendicularly connected to the top surface of the housing 11.

[0101] The rocker arm assembly 12 is inserted into the waist-shaped hole 111 on the top of the box body 11. The rocker arm assembly 12 includes a rocker arm rod 121, a first pin shaft 122 and a connecting circular plate 123.

[0102] In this embodiment, the rocker arm 121 passes through the waist-shaped hole 111, with one end located outside the box body 11 and the other end located inside the box body 11. A first pin hole 1211 is opened along the thickness direction of the rocker arm 121 in the middle of the length direction of the rocker arm 121 and at the end located inside the box body 11.

[0103] In this embodiment, the first pin shaft 122 passes through the first pin hole 1211 in the middle of the length direction of the rocker arm 121, and its two ends pass through the upper part of the support seat 112. This structure enables the rocker arm 121 to deflect and swing with the connection point between the first pin shaft 122 and the support seat 112 as the fulcrum.

[0104] In this embodiment, the center of one side surface of the connecting circular plate 123 is vertically connected to one end of the rocker arm 121 located outside the box body 11. A plurality of through holes 1231 are opened on the edge of the connecting circular plate 123.

[0105] The hydraulic cylinder assembly 13 is installed inside the housing 11 and is connected to the rocker arm assembly 12 to drive the rocker arm assembly 12 to swing back and forth. The hydraulic cylinder assembly 13 includes a hydraulic cylinder body 131, a piston rod 132, a U-shaped piece 133 and a second pin 134.

[0106] In this embodiment, the hydraulic cylinder body 131 is connected to the inner wall of the housing 11, with a U-shaped member 133 located at the free end of the piston rod 132. The end of the rocker lever 121 located within the housing 11 is inserted into the groove inside the U-shaped member 133, and a second pin 134 passes through the U-shaped member 133 and the rocker lever 121. With this structure, the reciprocating movement of the piston rod 132 of the hydraulic cylinder body 131 drives the rocker lever 121 to deflect and oscillate, with the connection point between the first pin 122 and the support base 112 serving as the fulcrum.

[0107] The test cylinder assembly 14 is connected to the connecting circular plate 123 of the rocker arm assembly 12 . The test cylinder assembly 14 includes a test cylinder 141 , a cylinder cover 142 , a loading cylinder 143 and a heat exchange member 144 .

[0108] In this embodiment, the test cylinder 141 is open at the top and closed at the bottom. Flanges 1411 are formed on the top and bottom of the test cylinder 141. Several monitoring holes 1412 are provided on the sidewalls of the test cylinder 141 for connecting testing instruments. Bolts (not shown) are inserted through the flanges 1411 at the bottom of the test cylinder 141 and the through holes 1231 on the edge of the connecting circular plate 123 to secure the entire test cylinder assembly 14 to the connecting circular plate 123.

[0109] In this embodiment, a cap 142 is positioned on top of the test tube 141. Its edge is bolted to a flange 1411 at the top of the test tube 141. A hollow cylindrical portion 1421 is formed in the center of the side of the cap 142 facing the test tube 141. The inner wall of the hollow cylindrical portion 1421 is internally threaded. A safety valve 1422 is installed on the cap 142 to prevent accidents caused by excessive pressure during testing.

[0110] In this embodiment, the loading cylinder 143 is cylindrical with a bottom, and its sidewalls and bottom walls are provided with multiple flow holes. The outer wall of the open end of the loading cylinder 143 is provided with external threads that mate with the internal threads of the hollow cylindrical portion 1421, allowing the loading cylinder 143 to be threadedly connected to the cylinder cover 142. The inner diameter of the loading cylinder 143 is larger than the largest diameter of the plastic bottle to be loaded, meaning that the plastic bottle can freely move within the loading cylinder 143. The depth of the loading cylinder 143 is greater than the height of the plastic bottle. The bottom surface of the loading cylinder 143 is 1-5 cm from the bottom surface of the testing cylinder 141.

[0111] In this embodiment, heat exchange element 144 is located within test cylinder 141 and is spiral-shaped. Its inlet and outlet extend through the sidewalls of test cylinder 141 and out of test cylinder 141. Heat exchange element 144 can be used to change the temperature within test cylinder 141 to simulate extreme conditions and test the sealing and quality of plastic bottles.

[0112] The heat and cold source assembly 20 is connected to the heat exchanger 144 of the test cylinder assembly 14 to change the temperature inside the test cylinder 141. The heat and cold source assembly 20 includes a heat source 21, a cold source 22, and two electromagnetic three-way valves 23. One passage of the electromagnetic three-way valve 23 is connected to the inlet and outlet of the heat exchanger 144, respectively, and the remaining two passages of the electromagnetic three-way valve 23 are connected to the heat source 21 and the cold source 22. The heat source 21 can be a heating medium such as water vapor or thermal oil with a temperature greater than 100°C that can increase the temperature of the liquid ambient medium in the test cylinder 141. The cold source 22 can be a cooling medium such as salt water with a temperature between 1 and 5°C that can lower the temperature of the liquid ambient medium in the test cylinder. The heat source 21 and the cold source 22 are used individually or alternately to simulate different temperatures to test the sealing and quality of plastic bottles.

[0113] The monitoring and stop assembly 30 monitors the internal conditions of the test barrel through monitoring hole 1412 and stops the test if the bottle seal is broken or cracked. The monitoring and stop assembly 30 includes a temperature sensor 31 and a pH meter 36. Both the temperature sensor 31 and the pH meter 36 extend into the test barrel 141 through monitoring hole 1412.

[0114] The controller 40 communicates with the plastic bottle extreme test bench 10, the heat and cold source assembly 20, and the monitoring and stop / detection assembly 30, and controls their operation. The controller 40 in this embodiment utilizes a commercially available product, such as an industrial computer, or prior art prior to the filing date of this application, without structural modification. The corresponding control program is adaptively adjusted based on the connected components. In this embodiment, the controller 40 is configured to monitor the temperature within the test cylinder 141, the switching between the heat source 21 and the cold source 22, the start / stop and stroke control of the hydraulic cylinder body 131, and the recording of test time.

[0115] In this embodiment, the plastic bottle limit test system has the following working modes:

[0116] (1) Low temperature (0~40℃) static mode;

[0117] (2) Low temperature dynamic mode;

[0118] (3) High temperature (41~100℃) static mode;

[0119] (4) High temperature dynamic mode;

[0120] (5) Variable temperature (temperature 0~100~0℃ cyclic change) static mode;

[0121] (6) Temperature-variable dynamic mode;

[0122] (7) Mixed mode (i.e. the above modes are used alternately).

[0123] Taking the low-temperature dynamic mode (2) as an example, in this embodiment, distilled water is used as the liquid environmental medium and filled in the test cylinder. An alkaline solution with a mass concentration of 40-50% is used as a liquid indicator and is encapsulated in a plastic bottle. The controller 40 controls the cold source 22 to be injected into the heat exchanger 144, so that the temperature in the test cylinder 141 is reduced to 5-10°C. At the same time, the controller 40 controls the hydraulic cylinder body 131 to work, driving the test cylinder assembly 14 to swing back and forth, and the plastic bottle will maintain a moving state, that is, the plastic bottle and the test cylinder assembly 14 will collide repeatedly. The plastic bottle repeatedly collides with the inner wall of the loading cylinder 143 in a low-temperature environment in the loading cylinder 143. When the seal of the plastic bottle is damaged or the bottle breaks, the alkaline solution originally filled in will flow out, causing the pH in the test cylinder 141 to change, completing the limit test.

[0124] The testing process for other modes is similar to the above process.

[0125] The plastic bottle limit testing system in this embodiment can simulate relatively harsh conditions to complete the plastic bottle limit testing, which has guiding significance for improving the quality of plastic bottles and the research on their sealing properties. Example 4

[0126] A plastic bottle limit test method is provided, wherein a liquid indicator solution is filled into a plastic bottle, sealed, and then inverted into a liquid environment medium. The liquid environment temperature and / or the activity state of the plastic bottle are changed to simulate the limit conditions, that is, one of the following is selected for testing: (1) low temperature (0-40°C) static mode, (2) low temperature dynamic mode, (3) high temperature (41-100°C) static mode, (4) high temperature dynamic mode, (5) variable temperature (temperature 0-100-0°C cyclic change) static mode, (6) variable temperature dynamic mode, and (7) mixed mode (i.e., the above modes are used alternately). When the liquid indicator is detected to flow out of the plastic bottle and into the liquid environment medium, the limit test is completed. The selection of the liquid environment medium and the liquid indicator should satisfy the requirement that the liquid indicator can cause changes in the properties of the liquid environment medium, such as pH value, conductivity, concentration, etc., after entering the liquid environment medium.

[0127] Specifically, when testing the plastic bottle limit test system in Example 2, the steps include:

[0128] S1. Filling the electrolyte solution into a plastic bottle and sealing;

[0129] S2. The encapsulated plastic bottle is placed upside down in the test tube assembly 14;

[0130] S3. Determine the working mode and simulate the extreme conditions;

[0131] S4. When the monitoring and stop-test component 30 detects that the electrolyte flows out of the plastic bottle and enters the distilled water, the limit test is completed.

Claims

1. A plastic bottle limit testing system for testing the sealing of plastic bottles, characterized in that: include: Plastic limit test bench, used for loading plastic bottles and liquid environmental media, and changing the activity state of plastic bottles; A cold and hot source assembly, connected to the plastic limit test bench, for changing the temperature of the liquid environment medium loaded in the plastic limit test bench; A monitoring and stop detection component, connected to the plastic limit test bench, for monitoring property changes of the liquid environmental medium loaded in the plastic limit test bench; a controller, communicating with the plastic limit test bench, the cold and hot source components, and the monitoring and detection and stop components, and configured to switch and implement working modes, as well as monitor and record; Wherein, the plastic limit test bench comprises: The box body has a waist-shaped hole and a support seat, and the support seat is located on both sides of the waist-shaped hole in the length direction; A rocker arm assembly is inserted into the waist-shaped hole and connected to the support seat, with one end thereof extending into the box body; A hydraulic cylinder assembly is installed in the box and is hinged to one end of the rocker arm assembly extending into the box; A test cylinder assembly comprises a test cylinder, a cylinder cover, a loading cylinder with a porous bottom and a heat exchange element, which is connected to one end of the rocker arm assembly located outside the housing; the cylinder cover is located on the top of the test cylinder; a monitoring hole is provided on the test cylinder; the loading cylinder is connected to the side of the cylinder cover facing the test cylinder; the heat exchange element is located in the test cylinder, and its inlet and outlet ends extend outside the test cylinder; the loading cylinder is threadedly connected to the cylinder cover, its inner diameter is larger than the maximum diameter of the plastic bottle to be loaded therein, and its depth is greater than the height of the plastic bottle, and the plastic bottle is in a free-moving state when loaded in the loading cylinder; a liquid environmental medium is filled in the test cylinder, and a liquid indicator is encapsulated in the plastic bottle.

2. The plastic bottle limit testing system according to claim 1, characterized in that: The rocker arm assembly comprises: A rocker arm is inserted into the waist-shaped hole; a first pin passing through the support seat and the rocker arm; A connecting circular plate is connected to one end of the rocker arm located outside the box; and the connecting circular plate is connected to the bottom flange of the test cylinder.

3. The plastic bottle limit testing system according to claim 1, characterized in that: The outer bottom surface of the loading cylinder is 1 to 5 cm away from the inner bottom surface of the testing cylinder.

4. The plastic bottle limit testing system according to claim 1, characterized in that: The heat exchange element is spiral-shaped.

5. The plastic bottle limit testing system according to claim 1, characterized in that: The cold and hot source components include: Heat source, used to increase the temperature of the liquid ambient medium; Cold source, used to reduce the temperature of the liquid ambient medium; An electromagnetic three-way valve, one passage of which is connected to the plastic limit test bench, and the remaining two passages are connected to the heat source and the cold source, is used to switch and change the temperature of the liquid environment medium.

6. The plastic bottle limit testing system according to claim 1, characterized in that: The monitoring and stopping component comprises a temperature sensor and a pH meter, and the temperature sensor and the pH meter extend into the liquid environment medium.

7. The plastic bottle limit testing system according to claim 1, characterized in that: The monitoring and stop detection component includes a temperature sensor, two electrodes, a 5V power supply, a switch and an indicator light. The temperature sensor and the electrodes are inserted into the liquid environment medium. The two electrodes, the 5V power supply, the switch and the indicator light are connected in series to form a conductive circuit. When the conductive circuit is closed, the indicator light is on, otherwise it is off.

8. A plastic bottle limit test method, implemented using the plastic bottle limit test system according to any one of claims 1 to 7, characterized in that the steps include: S1. Encapsulate the liquid indicator in a plastic bottle; S2. Place the plastic bottle from the previous step upside down in the liquid environment medium; S3. Change the temperature of the liquid environment medium and / or the activity state of the plastic bottle to simulate extreme test conditions; S4. Monitor the changes in the properties of the liquid environment medium. When the properties of the liquid environment medium change significantly at a certain moment, stop the test.

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