A PET bottle blank compression resistance performance detection device

Abstract

The utility model provides a kind of PET bottle blank compression resistance performance detection device, PET bottle blank compression resistance performance detection device includes compression resistance detection work platform and is used to the detection mechanism for PET bottle blank detection, detection mechanism is installed above compression resistance detection work platform, the inside of compression resistance detection work platform is formed with collection cavity, the top of compression resistance detection work platform is rotatably provided with rotating assembly, PET bottle blank is fixed in the top of rotating assembly, the outside of rotating assembly is rotatably provided with the clamping assembly for adjusting rotating assembly overturning surface, the outside of compression resistance detection work platform is fixed with blowing assembly etc., the PET bottle blank compression resistance performance detection device provided by the utility model, by setting collection cavity inside compression resistance detection work platform, and blowing assembly is fixed with the communication inside collection cavity on outside, solve the problem that existing device cleaning effect is not ideal etc., easy to operate and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of PET bottle testing technology, and in particular to a device for testing the compressive strength of PET bottle preforms. Background Technology

[0002] In many industries such as beverages and cosmetics, PET bottles are widely used in product packaging due to their excellent properties such as high transparency, light weight, and good barrier properties. As an intermediate product in the production of PET bottles, the quality of PET preforms directly determines the performance of the final PET bottles, and compressive strength is one of the key indicators for measuring the quality of PET preforms. The existing publication number CN219675695U discloses a PET preform compression resistance testing device, including a compression testing platform, a support frame at the top of the platform, a control box on one side, and a sliding plate slidably installed inside the support frame. This invention uses fixing straps, a first Velcro strap, a second Velcro strap, and a limiting buckle to fix the fixing straps to the PET preform body. The two fixing straps position the PET preform body, preventing it from rotating freely and facilitating the downward pressure of the pressure plate for testing. The first and second Velcro straps adhere to each other, facilitating the fixing of PET preform bodies of different sizes. Then, a hollow groove is secured to the limiting buckle, further reinforcing the stability of the fixing straps. This solves the problem of poor stability and easy displacement of the PET preform body during compression, causing it to fall from the testing area. The aforementioned device was found to have shortcomings in practical use. Firstly, the problem it addresses in testing the compressive strength of PET bottles is that the cylindrical shape of the PET preform makes it unstable during extrusion, prone to shifting, and causing it to fall from the testing area. The resulting fragments remain inside the testing area, hindering rapid cleanup. Secondly, the device has limitations in actual use. While it includes a moving push plate, adhesive strips, an electric push rod, and a fixed plate for post-test cleaning, the electric push rod activates after the PET preform is crushed, moving the moving push plate across the compressive strength testing platform. The adhesive strips act on the top surface of the platform, attempting to push out the fragments all at once for rapid cleaning. However, in practice, this cleaning method is not ideal. Firstly, due to the irregular shape and varying size of the fragments, some debris gets stuck in gaps or minor unevenness on the platform surface, making complete removal difficult and leaving residue that affects the accuracy of subsequent tests and the normal operation of the platform. On the other hand, the device lacks a collection and processing mechanism for the ejected debris. This debris is scattered around the workplace, which not only makes the working environment messy and increases the workload and difficulty of subsequent manual cleaning, but may also cause equipment failure due to the accumulation of debris, posing certain safety hazards and causing inconvenience to actual use.

[0003] Therefore, it is necessary to provide a new device for testing the compressive strength of PET preforms to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a device for testing the compressive strength of PET preforms.

[0005] The PET preform compression resistance testing device provided by this utility model includes: a compression resistance testing platform and a testing mechanism for testing PET preforms. The testing mechanism is installed above the compression resistance testing platform. A collection cavity is formed inside the compression resistance testing platform. A rotating assembly is rotatably arranged on the top of the compression resistance testing platform. The PET preform is fixed on the top of the rotating assembly. A locking assembly for adjusting the flipping surface of the rotating assembly is rotatably arranged on the outside of the rotating assembly. An air blowing assembly is fixed on the outside of the compression resistance testing platform. The air blowing assembly is connected to the inside of the collection cavity.

[0006] Preferably, the top of the pressure resistance testing platform is provided with a first mounting slot and a second mounting slot, and one end of the rotating component rotates on the inner wall of the first mounting slot. The rotating assembly includes a motor, which is fixed in the second mounting slot. A first rotating shaft is fixed to the output end of the motor. The first rotating shaft passes through the first mounting slot and rotates on the inner wall of the second mounting slot. A mounting plate is fixed to the surface of the first rotating shaft. Both ends of the mounting plate rotate on the inner wall of the second mounting slot. A plurality of third mounting slots are formed on the outer side of the mounting plate. A plurality of first grooves are also formed on the inner wall of the second mounting slot. The plurality of first grooves and the plurality of third mounting slots are in relative positions. The engaging assembly includes a plurality of engaging members. One end of each of the engaging members rotates on the inner wall of the plurality of third mounting slots.

[0007] Preferably, each of the plurality of engaging components includes a magnet, a rotating rod, a rotating plate, and a second locking block. The magnets are respectively fixedly connected to the inner walls of the plurality of third mounting slots. The rotating rods rotate on the inner walls of the plurality of third mounting slots. The rotating plates are respectively fixed to the surfaces of the rotating rods. The second locking blocks are respectively fixedly connected to one end of the rotating plates. A first pull ring is fixed to the top of each of the second locking blocks. A second spring is fixed to the bottom of each of the rotating plates. The other end of each of the second springs is fixedly connected to the bottom wall of the third mounting slot. A first locking block is fixed to the bottom wall of each of the first grooves. One end of each of the second locking blocks engages with the surface of the first locking blocks. The material of the second locking blocks is iron, and the backs of the second locking blocks are magnetically attracted to the magnets.

[0008] Preferably, a door is rotatably provided on one side of the pressure resistance testing platform, and multiple equidistant ventilation holes are provided through the outside of the door. A filter screen is fixed inside the door, and the filter screen covers the surface of the multiple ventilation holes.

[0009] Preferably, the air blowing assembly includes a bellows and a fan installed inside the bellows. The bellows is fixed on the side of the pressure testing platform away from the door. A ventilation mesh is fixed on the side of the bellows close to the pressure testing platform. The fan is connected to the interior of the collection chamber through the ventilation mesh.

[0010] Preferably, the testing mechanism includes an electric push rod and multiple telescopic rods. A top plate is provided above the compression testing platform. The two ends of the electric push rod and the multiple telescopic rods are respectively fixedly connected to the top of the compression testing platform and the bottom of the top plate. Multiple through holes are opened on the top of the top plate, and sliding rods are slidably arranged in each of the multiple through holes. A lower pressure plate is also provided between the top plate and the compression testing platform. One end of each of the multiple sliding rods passes through the surface of the top plate and is fixedly connected to the top of the lower pressure plate. A limit block is fixed to the top of each of the multiple sliding rods. A first spring is sleeved on the surface of each of the multiple sliding rods. The two ends of the multiple first springs are respectively fixedly connected to the top of the lower pressure plate and the bottom of the top plate. A test sensor is also fixed to the top of the lower pressure plate.

[0011] Preferably, a foam pad is fixed to the top of the mounting plate, the PET preform is placed on the top of the foam pad, and the top of the mounting plate is also provided with two limiting components for limiting the PET preform. Both of the aforementioned limiting components include Velcro, one end of which is fixed with a second pivot. Both ends of the second pivot rotate on the top of the mounting plate. The other end of the Velcro has a plurality of equidistant positioning holes. The top of the mounting plate is also fixed with two brackets. A third pivot is rotatably mounted on the inner sidewall of each of the two brackets. A locking plate is fixed on the surface of each of the two third pivots. A second pull ring and a positioning block are fixed at the ends of the two locking plates away from the third pivots. The second pull ring and the positioning block are respectively fixed to the top and bottom of the locking plates, and the bottom of the positioning block is fastened into the positioning hole.

[0012] Compared with related technologies, the PET preform compression resistance testing device provided by this utility model has the following advantages: 1. This utility model sets up a collection chamber inside the pressure testing platform and fixes an air blowing component connected to the inside of the collection chamber on the outside. After the test is completed, the drive rotating component drives the PET bottle preform to flip, and the air blowing component is activated to blow up the debris that is stuck in the gaps or small unevenness of the pressure testing platform surface and scatter it into the collection chamber. To a certain extent, it can clean the debris on the surface of the pressure testing platform over a large area with good cleaning effect, avoiding excessive debris residue that may affect the accuracy of subsequent tests and ensuring the normal use of the platform. At the same time, the collection chamber collects the debris in a concentrated manner, preventing debris from scattering, greatly improving the working environment, reducing the workload of subsequent manual cleaning, reducing the risk of equipment failure caused by debris accumulation, further improving the safety of the equipment, and solving the problem of unsatisfactory cleaning effect of existing devices. 2. This utility model features a rotating assembly mounted on the top of a pressure testing platform. PET preforms are fixed to the top of the rotating assembly, and a locking assembly is mounted on the outside of the rotating assembly to adjust its flipping surface. In actual testing, after a PET preform is tested, the locking assembly can limit the flipping surface of the rotating assembly, causing the broken PET preform to fall into the collection chamber. The blower assembly then cleans the broken pieces. The operation of cleaning the debris is simple and convenient. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of the PET preform compression resistance testing device provided by this utility model; Figure 2 A schematic diagram of the main structure of the PET preform compression resistance testing device provided by this utility model; Figure 3 A cross-sectional structural schematic diagram of the PET preform compression resistance testing device provided by this utility model; Figure 4 A schematic diagram of the structure of the PET preform compression resistance testing device provided by this utility model; Figure 5 This is a schematic diagram of the limit component.

[0014] Numbered in the diagram: 1. Compression testing platform; 11. Box door; 111. Ventilation hole; 112. Filter screen; 113. First mounting slot; 114. Second mounting slot; 115. First groove; 116. First locking block; 12. Telescopic rod; 13. Electric push rod; 14. Air box; 141. Fan; 142. Ventilation mesh plate; 2. Top plate; 21. Through hole; 22. Slide rod; 23. Lower pressure plate; 231. First spring; 232. Measuring... 1. Test sensor; 2. PET preform; 3. Motor; 4. First rotating shaft; 5. Mounting plate; 6. Third mounting groove; 7. Foam pad; 8. Magnet; 9. Rotating rod; 10. Rotating plate; 11. Second locking block; 22. Second spring; 3. First pull ring; 43. Velcro; 5. Second rotating shaft; 64. Positioning hole; 7. Bracket; 8. Third rotating shaft; 9. Locking plate; 10. Second pull ring; 11. Positioning block. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Please refer to the following: Figures 1 to 5 ,in, Figure 1 A schematic diagram of the overall structure of the PET preform compression resistance testing device provided by this utility model; Figure 2 A schematic diagram of the main structure of the PET preform compression resistance testing device provided by this utility model; Figure 3 A cross-sectional structural schematic diagram of the PET preform compression resistance testing device provided by this utility model; Figure 4 A schematic diagram of the structure of the PET preform compression resistance testing device provided by this utility model; Figure 5 This is a schematic diagram of the limit component.

[0017] In some embodiments, such as Figures 1 to 5 As shown, it includes a pressure testing platform 1 and a testing mechanism for testing PET preforms 3. The testing mechanism is installed above the pressure testing platform 1. A collection chamber is formed inside the pressure testing platform 1 to collect the fragments after the PET preforms 3 are broken. A rotating assembly is rotatably installed on the top of the pressure testing platform 1. The PET preforms 3 are fixed on the top of the rotating assembly. A locking assembly for adjusting the flipping surface of the rotating assembly is rotatably installed on the outside of the rotating assembly. An air blowing assembly is fixed on the outside of the pressure testing platform 1 and is connected to the inside of the collection chamber. Specifically, by setting a collection chamber inside the pressure testing platform 1 and fixing an air blowing component connected to the inside of the collection chamber on the outside of the pressure testing platform 1, after the test is completed, the drive rotating component drives the PET bottle preform 3 to flip over, and the air blowing component is activated to blow up the debris that remains in the gaps or small unevenness on the surface of the pressure testing platform 1 and scatter it into the collection chamber. To a certain extent, it can clean the debris on the surface of the pressure testing platform 1 over a large area, with a good cleaning effect, avoiding excessive debris residue that may affect the accuracy of subsequent tests, and ensuring the normal use of the pressure testing platform 1. At the same time, the collection chamber collects the debris in a concentrated manner, preventing the debris from scattering, greatly improving the working environment, reducing the workload of subsequent manual cleaning, reducing the risk of equipment failure caused by debris accumulation, and further improving the safety of the equipment. Furthermore, a rotating assembly is rotatably installed on the top of the pressure testing platform 1, and the PET preform 3 is fixed on the top of the rotating assembly. A locking assembly for adjusting the flipping surface of the rotating assembly is rotatably installed on the outside of the rotating assembly. In actual testing, after a PET preform 3 has been tested, the flipping surface of the rotating assembly can be limited by the locking assembly, so that the broken PET preform 3 falls into the collection chamber and is then cleaned by blowing with an air blowing assembly. The operation of cleaning the debris is simple and convenient.

[0018] In some embodiments, reference is made to Figures 1 to 4 As shown, the top of the pressure testing work platform 1 is provided with a first mounting groove 113 and a second mounting groove 114, and one end of the rotating component rotates on the inner side wall of the first mounting groove 113. The rotating assembly includes a motor 4, which is fixed in the second mounting groove 114. The output end of the motor 4 is fixed with a first rotating shaft 41. The first rotating shaft 41 passes through the first mounting groove 113 and rotates on the inner sidewall of the second mounting groove 114. A mounting plate 42 is fixed on the surface of the first rotating shaft 41. Both ends of the mounting plate 42 rotate on the inner sidewall of the second mounting groove 114. A plurality of third mounting grooves 421 are opened on the outer side of the mounting plate 42. A plurality of first grooves 115 are also opened on the inner sidewall of the second mounting groove 114. The plurality of first grooves 115 and the plurality of third mounting grooves 421 are in relative positions. The engaging assembly includes a plurality of engaging members. One end of the plurality of engaging members rotates on the inner sidewall of the plurality of third mounting grooves 421 respectively. Each of the multiple engaging components includes a magnet 5, a rotating rod 51, a rotating plate 52, and a second locking block 521. The multiple magnets 5 are fixedly connected to the inner walls of the multiple third mounting slots 421 respectively. The multiple rotating rods 51 rotate on the inner walls of the multiple third mounting slots 421 respectively. The multiple rotating plates 52 are fixed to the surfaces of the multiple rotating rods 51 respectively. The multiple second locking blocks 521 are fixedly connected to one end of the multiple rotating plates 52 respectively. A first pull ring 523 is fixed to the top of the multiple second locking blocks 521. A second spring 522 is fixed to the bottom of the multiple rotating plates 52. The other ends of the multiple second springs 522 are fixedly connected to the bottom wall of the third mounting slot 421. A first locking block 116 is fixed to the bottom wall of the multiple first grooves 115 respectively. One end of the multiple second locking blocks 521 is engaged with the surface of the multiple first locking blocks 116 respectively. The multiple second locking blocks 521 are made of iron. The back of the multiple second locking blocks 521 is magnetically attracted to the multiple magnets 5 respectively. The pressure testing work platform 1 has a rotating door 11 on one side. Multiple equidistant ventilation holes 111 are provided through the outside of the door 11. A filter screen 112 is fixed inside the door 11, and the filter screen 112 covers the surface of the multiple ventilation holes 111. The air blowing assembly includes a bellows 14 and a blower 141 installed inside the bellows 14. The bellows 14 is fixed on the side of the pressure testing work platform 1 away from the door 11. A ventilation mesh plate 142 is fixed on the side of the bellows 14 close to the pressure testing work platform 1. The blower 141 is connected to the inside of the collection chamber through the ventilation mesh plate 142.

[0019] Specifically, in use, the PET preform 3 is first positioned on the mounting plate 42 at the top of the rotating assembly. The flipping surface of the mounting plate 42 is adjusted using the locking assembly, so that the flipped surface of the PET preform 3 faces upwards. The detection mechanism is then activated to test the compressive strength of the PET preform 3. During the test, as needed, the second locking block 521 inside the locking assembly can be manually engaged to release the locking mechanism from the first locking block 116. The iron second locking block 521 is then rotated to one side of the magnet 5, where it attracts the magnet 5. At this point, the motor 4 can... The mounting plate 42 is driven to rotate as needed, positioning the PET preform 3 at different angles for multi-angle detection. After detection, the motor 4 is driven to flip the mounting plate 42, so that the side of the mounting plate 2 with the PET preform 3 faces downwards. The blower 141 in the air blowing assembly is then activated, generating airflow that is blown into the collection chamber through the air box 14 and the ventilation screen 142, creating pressure that blows PET preform 3 fragments from the surface of the mounting plate 42 into the collection chamber. The fragments in the collection chamber can be cleaned by opening the door 11. The ventilation holes 111 and the filter screen 112 ensure ventilation of the collection chamber while preventing dust and other impurities from entering. Furthermore, the rotating component can achieve multi-angle rotation of the PET preform 3. Combined with the testing mechanism, it can perform compressive strength testing on the PET preform 3 at different angles, obtain more comprehensive test data, and help enterprises better understand the performance characteristics of the PET preform 3. Furthermore, the design of the locking assembly simplifies the adjustment of the rotating assembly's flipping surface. Operators only need to pull the second locking block 521 through the first pull ring 523 to overcome the elastic force of the second spring 522, causing the second locking block 521 to separate from the first locking block 116, and magnetically fix the back of the second locking block 521 to the magnet 5. Then, the mounting plate 42 can be rotated to replace the PET preform 3 to be tested, greatly improving testing efficiency and reducing operational difficulty and labor intensity.

[0020] In some embodiments, reference is made to Figures 1 to 3As shown, the testing mechanism includes an electric push rod 13 and multiple telescopic rods 12. A top plate 2 is provided above the pressure testing platform 1. The two ends of the electric push rod 13 and multiple telescopic rods 12 are fixedly connected to the top of the pressure testing platform 1 and the bottom of the top plate 2, respectively. Multiple through holes 21 are provided on the top of the top plate 2. Sliding rods 22 are slidably installed in each of the multiple through holes 21. A lower pressure plate 23 is also provided between the top plate 2 and the pressure testing platform 1. One end of each of the multiple sliding rods 22 passes through the surface of the top plate 2 and is fixedly connected to the top of the lower pressure plate 23. A limit block is fixed to the top of each of the multiple sliding rods 22. The limit block is used to prevent the sliding rods 22 from disengaging from the through holes 21. A first spring 231 is sleeved on the surface of each of the multiple sliding rods 22. The two ends of the multiple first springs 231 are fixedly connected to the top of the lower pressure plate 23 and the bottom of the top plate 2, respectively. A test sensor 232 is also fixed to the top of the lower pressure plate 23.

[0021] Specifically, during use, the PET preform 3 to be tested is placed on the pressure testing platform 1 and its position is adjusted so that it is directly below the lower pressure plate 23. At this time, the electric push rod 13 is in its initial state, and the lower pressure plate 23 is in a higher position under the action of the first spring 231, with a certain distance between it and the PET preform 3. At this time, the electric push rod 13 is activated, and the electric push rod 13 extends downward, pushing the top plate 2 to move downward. Since the slide rod 22 is fixedly connected to the lower pressure plate 23, the top plate drives the lower pressure plate 23 to move downward together through the slide rod, gradually approaching and contacting the PET preform 3. As the electric push rod 13 continues to extend, the pressure applied by the lower pressure plate 23 to the PET preform 3 gradually increases. During the pressing process, the test sensor 232 detects the pressure on the lower pressure plate 23 in real time and transmits the data to the control system. When the pressure reaches the preset value or the PET preform 3 ruptures or other predetermined conditions, the control system records the pressure data at this time, which serves as an important basis for evaluating the pressure resistance performance of the PET preform 3, and is the existing technology.

[0022] In some embodiments, reference is made to Figure 1 , Figure 4 as well as Figure 5 As shown, a foam pad 43 is fixed to the top of the mounting plate 42, the PET preform 3 is placed on the top of the foam pad 43, and the top of the mounting plate 42 is also provided with two limiting components for limiting the PET preform 3. Both limiting components include Velcro 6. One end of Velcro 6 is fixed with a second pivot 61. Both ends of the second pivot 61 rotate on the top of the mounting plate 42. The other end of Velcro 6 has multiple equidistant positioning holes 62. The top of the mounting plate 42 is also fixed with two brackets 63. The inner sidewalls of the two brackets 63 are rotatably provided with a third pivot 631. The surfaces of the two third pivots 631 are fixed with a locking plate 632. The ends of the two locking plates 632 away from the third pivots 631 are fixed with a second pull ring 64 and a positioning block 65. The second pull ring 64 and the positioning block 65 are fixed to the top and bottom of the locking plate 632, respectively, and the bottom of the positioning block 65 is fastened into the positioning hole 62.

[0023] Specifically, during use, the PET preform 3 to be tested is placed on the foam pad 43 on top of the mounting plate 42. The foam pad 43 provides initial stable support for the PET preform 3. According to the size and shape of the PET preform 3, the Velcro 6 is rotated to rotate around the second pivot 61, adjusting the Velcro 6 to a suitable position so that it can wrap around the PET preform 3, playing an initial limiting role. After the Velcro 6 is adjusted to a suitable position, the clamping plate 632 is rotated to rotate around the third pivot 631. The clamping plate 632 can be easily operated by holding the second pull ring 64, and the positioning block 65 at the bottom of the clamping plate 632 is fastened into the corresponding positioning hole 62 on the Velcro 6. In this way, the Velcro 6 is fixed in the current position, wrapping around the PET preform 3, thereby limiting the PET preform 3 and preventing it from moving during the testing process to a certain extent.

[0024] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0025] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A device for testing the compressive strength of PET preforms, comprising a compressive strength testing platform (1) and a testing mechanism for testing PET preforms (3), wherein the testing mechanism is installed above the compressive strength testing platform (1), characterized in that, The pressure testing platform (1) has a collection cavity inside. A rotating assembly is rotatably provided on the top of the pressure testing platform (1). The PET preform (3) is fixed on the top of the rotating assembly. A locking assembly for adjusting the flipping surface of the rotating assembly is rotatably provided on the outside of the rotating assembly. An air blowing assembly is fixed on the outside of the pressure testing platform (1). The air blowing assembly is connected to the inside of the collection cavity.

2. The PET preform compression resistance testing device according to claim 1, characterized in that, The top of the pressure resistance testing platform (1) is provided with a first mounting groove (113) and a second mounting groove (114), and one end of the rotating component rotates on the inner wall of the first mounting groove (113). The rotating assembly includes a motor (4), which is fixed in the second mounting groove (114). The output end of the motor (4) is fixed with a first rotating shaft (41). The first rotating shaft (41) passes through the first mounting groove (113) and rotates on the inner wall of the second mounting groove (114). A mounting plate (42) is fixed on the surface of the first rotating shaft (41). Both ends of the mounting plate (42) rotate on the inner wall of the second mounting groove (114). A plurality of third mounting grooves (421) are opened on the outer side of the mounting plate (42). A plurality of first grooves (115) are also opened on the inner wall of the second mounting groove (114). The plurality of first grooves (115) and the plurality of third mounting grooves (421) are in relative positions. The engaging assembly includes a plurality of engaging members. One end of the plurality of engaging members rotates on the inner wall of the plurality of third mounting grooves (421).

3. The PET preform compression resistance testing device according to claim 2, characterized in that, Each of the multiple engaging components includes a magnet (5), a rotating rod (51), a rotating plate (52), and a second locking block (521). The magnets (5) are respectively fixedly connected to the inner walls of the multiple third mounting slots (421). The rotating rods (51) rotate on the inner walls of the multiple third mounting slots (421). The rotating plates (52) are respectively fixed to the surfaces of the multiple rotating rods (51). The second locking blocks (521) are respectively fixedly connected to one end of the multiple rotating plates (52). A first locking block is fixed to the top of each of the multiple second locking blocks (521). A pull ring (523) is provided. The bottom of the multiple rotating plates (52) is fixed with a second spring (522). The other end of the multiple second springs (522) is fixedly connected to the bottom wall of the third mounting groove (421). The bottom wall of the multiple first grooves (115) is fixed with a first locking block (116). One end of the multiple second locking blocks (521) is engaged with the surface of the multiple first locking blocks (116). The material of the multiple second locking blocks (521) is iron. The back of the multiple second locking blocks (521) is magnetically attracted to the multiple magnets (5).

4. The PET preform compression resistance testing device according to claim 3, characterized in that, The pressure testing platform (1) has a rotating door (11) on one side. Multiple equidistant ventilation holes (111) are provided through the outside of the door (11). A filter screen (112) is fixed inside the door (11) and covers the surface of the multiple ventilation holes (111).

5. The PET preform compression resistance testing device according to claim 4, characterized in that, The air blowing assembly includes a bellows (14) and a fan (141) installed inside the bellows (14). The bellows (14) is fixed on the side of the pressure testing platform (1) away from the door (11). A ventilation mesh plate (142) is fixed on the side of the bellows (14) close to the pressure testing platform (1). The fan (141) is connected to the interior of the collection chamber through the ventilation mesh plate (142).

6. The PET preform compression resistance testing device according to claim 5, characterized in that, The testing mechanism includes an electric push rod (13) and multiple telescopic rods (12). A top plate (2) is provided above the pressure testing platform (1). The two ends of the electric push rod (13) and the multiple telescopic rods (12) are respectively fixedly connected to the top of the pressure testing platform (1) and the bottom of the top plate (2). Multiple through holes (21) are opened on the top of the top plate (2), and sliding rods (22) are slidably arranged in each of the multiple through holes (21). The top plate (2) and the pressure testing platform (1) are connected. A lower pressure plate (23) is also provided between them. One end of each of the multiple sliding rods (22) passes through the surface of the top plate (2) and is fixedly connected to the top of the lower pressure plate (23). A limit block is fixed to the top of each of the multiple sliding rods (22). A first spring (231) is sleeved on the surface of each of the multiple sliding rods (22). The two ends of the multiple first springs (231) are fixedly connected to the top of the lower pressure plate (23) and the bottom of the top plate (2), respectively. A test sensor (232) is also fixed to the top of the lower pressure plate (23).

7. The PET preform compression resistance testing device according to claim 6, characterized in that, A foam pad (43) is fixed to the top of the mounting plate (42), the PET preform (3) is placed on the top of the foam pad (43), and the top of the mounting plate (42) is also provided with two limiting components for limiting the PET preform (3); Both of the limiting components include Velcro (6), one end of which is fixed with a second pivot (61). Both ends of the second pivot (61) rotate on the top of the mounting plate (42). The other end of the Velcro (6) is provided with a plurality of equidistant positioning holes (62). The top of the mounting plate (42) is also fixed with two brackets (63). The inner sidewalls of the two brackets (63) are rotatably provided with a third pivot (631). The surfaces of the two third pivots (631) are fixed with a clamping plate (632). The ends of the two clamping plates (632) away from the third pivots (631) are fixed with a second pull ring (64) and a positioning block (65). The second pull ring (64) and the positioning block (65) are respectively fixed to the top and bottom of the clamping plate (632), and the bottom of the positioning block (65) is fastened into the positioning hole (62).

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