Device and method for testing compression performance of pearl wool

Abstract

The invention relates to the technical field of pearl wool testing, in particular to a device and method for testing the compression performance of pearl wool, and the device comprises a bottom plate and a support frame mounted on the bottom plate; the pearl wool compression performance testing device further comprises a placing mechanism, the placing mechanism is connected to the upper end of the supporting frame, the placing mechanism comprises a bearing part which is connected to the upper end of the supporting frame and used for bearing pearl wool, and the bearing part is connected with an extrusion limiting part used for positioning the pearl wool. The placement mechanism, the pressure applying mechanism and the pushing mechanism are matched, so that the compression performance test of the pearl wool in various environments can be simulated, the same compression performance test device can simulate the actual use condition of the pearl wool, and the detection effect of the pearl wool is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pearl cotton testing, and in particular to a device and method for testing the compression performance of pearl cotton. Background Art

[0002] Pearl cotton is a widely used environmentally friendly packaging material, composed of countless independent bubbles produced by physical foaming of low-density polyethylene. It is light and soft, and has good cushioning, shock resistance, waterproof and moisture-proof properties.

[0003] The compression performance of pearl cotton is one of the most important performance indicators as a cushioning packaging material. Therefore, it is necessary to test the compression performance of pearl cotton. The existing compression performance test usually follows a standardized procedure to ensure the accuracy and repeatability of the results. The specific steps are: place the pearl cotton sample between the upper and lower pressure plates of the pressure testing machine, gradually apply pressure, and record the deformation of the sample under different pressures, or continue to apply pressure to the pearl cotton. However, the existing test results are for compression performance testing of plate-shaped samples. However, in actual use, pearl cotton exists in the form of plates, and more often it has grooves on the surface, which is used to protect fresh fruits and vegetables or electronic products to reduce external In practice, fresh fruits and vegetables or electronic products being transported are not only pressed by products above them, but also collide with surrounding objects and are inevitably affected by vibrations. However, this situation was not simulated during the actual test. In addition, pearl cotton is also used in cold chain transportation. The pearl cotton under cold chain transportation is in a low temperature environment for a long time and is subject to bumps during transportation. However, the existing tests are only carried out under normal conditions, and whether the compression performance of pearl cotton will be affected in a low temperature environment is not considered. It is impossible to clearly test the actual compression strength that pearl cotton can withstand under harsh conditions, and the overall test environment is single.

[0004] Therefore, there is an urgent need to provide a compression performance testing device that can increase the testing environment. Summary of the Invention

[0005] Based on this, it is necessary to provide a pearl cotton compression performance testing device and testing method, aiming to solve the problem of the single existing pearl cotton testing environment.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a pearl cotton compression performance testing device, comprising: a base plate and a support frame installed on the base plate.

[0007] The pearl cotton compression performance testing device also includes a placing mechanism, which is connected to the upper end of the support frame. The placing mechanism includes a supporting part connected to the upper end of the support frame and used to support the pearl cotton, and the supporting part is connected to an extrusion limiting part for positioning the pearl cotton.

[0008] The supporting part includes a supporting seat placed on the upper end of the supporting frame, and lifting rods that are slidably connected to the supporting frame are installed at the four corners of the lower end of the supporting seat. A receiving groove is provided in the supporting seat, and a plurality of air outlet holes connected to the receiving groove are provided at the upper end of the supporting seat.

[0009] The pearl cotton compression performance testing device also includes a pressure mechanism, which is connected to the upper end of the support frame. The pressure mechanism includes a pressure module installed on the upper end of the support frame through two support rods. A connecting head is installed at the lower end of the pressure module, and a contact part and a pushing part are detachably connected to the connecting head.

[0010] The pearl cotton compression performance testing device also includes a pushing mechanism, which is connected in the support frame and is used to push the multiple lifting rods.

[0011] The pressure module, contact part and supporting seat are used for conventional compression testing of EPP. On this basis, they are coordinated with the pushing part and extrusion limit part to simulate the test of EPP in a collision environment. In the environment where the side of EPP is squeezed, the contact part is placed on the EPP, and then dry ice is placed in the receiving tank, and the pushing mechanism is driven to intermittently push the supporting part to simulate the test of EPP in a cold chain transportation environment.

[0012] Preferably, the pressure mechanism further comprises a sealing portion for providing a sealed test environment, wherein the sealing portion comprises a sealing top plate mounted on the pressure module, a bellows mounted at the lower end of the sealing top plate, and a counterweight frame mounted at the lower end of the bellows.

[0013] Preferably, the sealing portion further comprises positioning rods symmetrically mounted on the front and rear ends of the counterweight frame via ear seat plates, and the upper ends of the positioning rods are rotatably connected to a positioning plate.

[0014] Preferably, the pushing mechanism includes a transmission module connected to the support frame, and a plurality of evenly distributed arc-shaped protrusions are installed on the transmission module.

[0015] Preferably, the supporting portion further includes a receiving frame which is slidably connected to the receiving groove and is used for placing dry ice.

[0016] Preferably, the extrusion limiting portion includes a limiting frame installed on the upper end of the supporting seat, and a plurality of evenly distributed extrusion rods slide through the wall of the limiting frame. A connecting plate is integrally formed on the surface of the extrusion rod located inside the limiting frame, and a reset spring mounted on the extrusion rod is installed between the connecting plate and the inner end surface of the limiting frame.

[0017] Preferably, the contact portion includes a connecting sleeve sleeved on the connecting head, the connecting sleeve is connected to the connecting head via bolts, and a counterweight pressure plate is installed at the lower end of the connecting sleeve.

[0018] Preferably, the pushing portion includes a connector connected to the connecting head via bolts, a lower pressing frame is installed at the lower end of the connector, and a pushing surface is provided on the inner side of the lower end of the lower pressing frame.

[0019] Preferably, a safety valve is installed on the upper end of the sealing top plate.

[0020] Preferably, the connecting member is composed of a sliding ring sleeved on the connecting head and a plurality of supporting plates installed between the sliding ring and the pressing frame.

[0021] Preferably, the lower end of the lifting rod is rotatably connected to a roller via a roller frame.

[0022] Preferably, the end of the extrusion rod away from the inner side of the limiting frame is provided with a hemispherical protrusion that cooperates with the pushing surface.

[0023] In addition, the present invention also provides a method for testing the compression performance of pearl cotton, which specifically comprises the following steps:

[0024] S1: Place the EPE foam to be tested on the upper end of the support seat, and squeeze the limiting part to limit the EPE foam.

[0025] S2: Connect the contact part to the connector at the lower end of the pressure module, and the pressure module performs a conventional compression test on the pearl cotton through the contact part.

[0026] S3: After the test in step S2, the pearl cotton is replaced. On the basis of step S2, the pushing part is connected to the connector at the lower end of the pressure module. The pressure module drives the pushing part to push the extrusion limiting part, and the extrusion limiting part squeezes the side of the pearl cotton to simulate the test of the pearl cotton in a collision environment.

[0027] S4: After the test in step S3, replace the pearl cotton, separate the contact part from the connector, and then place the contact part directly on the pearl cotton. Then place dry ice in the receiving tank, and drive the pushing mechanism to push the supporting part intermittently, and then cooperate with step S3 to simulate the test of pearl cotton in a cold chain transportation environment.

[0028] S5: After the multiple tests of the pearl cotton are completed, the test ends.

[0029] In summary, the present invention has the following beneficial effects:

[0030] 1. The supporting part, pressure module and contact part used in the present invention cooperate with each other, which can realize conventional compression performance test and compression permanent deformation test on the pearl cotton with placement groove and the pearl cotton without placement groove in sequence. The placement mechanism and pressure mechanism used cooperate with each other to simulate the compression performance test of the pearl cotton with placement groove under collision environment. The placement mechanism, pressure mechanism and pushing mechanism used cooperate with each other to simulate the compression performance test of the pearl cotton with placement groove in cold chain transportation environment. The same compression performance testing device can simulate the actual use of pearl cotton, effectively improving the diversity of pearl cotton testing and the test effect.

[0031] 2. The extrusion limiting part adopted in the present invention can not only cooperate with the pushing part to realize the reciprocating pushing of the pearl cotton, but also play a role in limiting the placed pearl cotton. Without adding a limiting structure, it can avoid the phenomenon of large-scale displacement of the pearl cotton during the detection process, ensuring that the pearl cotton is always within the detection area. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below with reference to the accompanying drawings and examples.

[0033] Figure 1 A schematic diagram of the three-dimensional structure of the present invention from a first viewing angle is shown.

[0034] Figure 2 A schematic diagram of the three-dimensional structure of the present invention from a second viewing angle is shown.

[0035] Figure 3 A front view of the present invention is shown.

[0036] Figure 4 A left side view of the present invention is shown.

[0037] Figure 5 Shown Figure 4 Cross-sectional view of AA in the figure.

[0038] Figure 6 Shown Figure 5 Magnified view of area B.

[0039] Figure 7 A schematic structural diagram of a portion of the support frame, the supporting portion, and the extrusion limiting portion of the present invention is shown.

[0040] Figure 8 It shows a schematic structural diagram of part of the pressure module, contact part and pushing part of the present invention.

[0041] The above drawings include the following reference numerals: 1. bottom plate; 2. support frame; 3. placement mechanism; 30. supporting portion; 300. supporting seat; 301. lifting rod; 302. receiving groove; 303. air outlet; 304. placing frame; 305. roller; 31. extrusion limit portion; 310. limit frame; 311. extrusion rod; 312. reset spring; 4. pressure mechanism; 40. pressure module; 41. connector ; 42. Contact part; 420. Connecting sleeve; 421. Counterweight pressure plate; 43. Pushing part; 430. Lower pressure frame; 431. Pushing surface; 432. Sliding ring; 433. Support plate; 44. Sealing part; 440. Sealing top plate; 441. Bellows; 442. Counterweight frame; 443. Positioning rod; 444. Positioning plate; 445. Safety valve; 5. Pushing mechanism; 50. Transmission module; 51. Arc-shaped protrusion. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] See Figures 1-4 A device for testing the compression performance of pearl cotton includes a base plate 1 and a support frame 2 installed on the base plate 1, and the support frame 2 is a U-shaped structure with an opening facing downward.

[0044] See Figure 1 and Figure 2 The pearl cotton compression performance testing device also includes a placing mechanism 3, which is connected to the upper end of the support frame 2. The placing mechanism 3 includes a supporting part 30 connected to the upper end of the support frame 2 and used to support the pearl cotton. The supporting part 30 includes a supporting seat 300 placed on the upper end of the support frame 2.

[0045] During specific operation, the base plate 1 is fixedly installed at the working position, the support frame 2 is used to support the placement mechanism 3, and then the pearl cotton to be tested is placed on the supporting seat 300.

[0046] See Figure 1 、 Figure 5 、 Figure 6 and Figure 7The supporting portion 30 is connected to an extrusion limiting portion 31 for positioning the pearl cotton. The extrusion limiting portion 31 includes a limiting frame 310 installed at the upper end of the supporting seat 300. A plurality of evenly distributed extrusion rods 311 slide through the frame wall of the limiting frame 310. The extrusion rods 311 are located on the surface inside the limiting frame 310 and are integrally formed with a connecting plate. A return spring 312 is installed between the connecting plate and the inner end surface of the limiting frame 310 and is sleeved on the extrusion rods 311.

[0047] During specific operation, the EPE is placed between a plurality of extrusion rods 311 , which limit the EPE to avoid lateral movement of the EPE during detection, thereby ensuring that the EPE is always within the detection area.

[0048] See Figure 1 、 Figure 2 、 Figure 5 and Figure 8 The pearl cotton compression performance testing device also includes a pressure mechanism 4, which is connected to the upper end of the support frame 2. The pressure mechanism 4 includes a pressure module 40 installed on the upper end of the support frame 2 through two support rods. A connecting head 41 is installed at the lower end of the pressure module 40. The connecting head 41 is detachably connected to a contact portion 42 and a pushing portion 43. The pressure module 40, the contact portion 42 and the supporting seat 300 cooperate for conventional compression testing of pearl cotton.

[0049] See Figure 8 The contact portion 42 includes a connecting sleeve 420 that is sleeved on the connecting head 41. The connecting head 41 is a stepped cylindrical shape and the diameter of the upper part is larger than the diameter of the lower part. The connecting sleeve 420 is connected to the lower part of the connecting head 41 by bolts, and a counterweight pressure plate 421 is installed at the lower end of the connecting sleeve 420.

[0050] During specific operation, the pressure module 40 is composed of an existing hydraulic cylinder and a pressure sensor installed at the lower end of the hydraulic cylinder. The pressure sensor is connected to an external display device with an electrical signal. When the pressure sensor senses pressure, it converts the sensed pressure into an electrical signal, amplifies and modulates the electrical signal, and finally converts the electrical signal into a digital signal and displays it in real time on the display screen of the display device. The hydraulic cylinder is then connected to the existing hydraulic pump. When performing a conventional compression test on the pearl cotton, the connecting sleeve 420 is installed on the connecting head 41 by bolts, and the hydraulic cylinder is started to make the telescopic section of the hydraulic cylinder move back and forth. The hydraulic cylinder drives the connecting sleeve 420 and the counterweight pressure plate 421 to move downward through the pressure sensor and the connecting head 41 and reciprocate to squeeze the pearl cotton. During squeezing, the reading of the pressure sensor is observed to ensure that the applied pressure meets the test requirements. The applied pressure can be adjusted according to actual needs. After a certain period of time, the hydraulic cylinder is released and the rebound of the pearl cotton is observed and recorded, thereby realizing the function of performing a conventional compression test on the pearl cotton.

[0051] If the hydraulic cylinder continues to press down and does not move back and forth, after the pearl cotton is compressed for a certain period of time, the hydraulic cylinder is released and the rebound of the pearl cotton is observed and recorded, thereby realizing the compression permanent deformation test.

[0052] Then, the EPE with the placement groove is placed on the support seat 300, and the previous EPE conventional compression test and compression permanent deformation test are repeated, and the test results are recorded. The results are then compared with the test results of the EPE without the placement groove to obtain the results.

[0053] See Figure 8 The pushing portion 43 includes a connector connected to the connector head 41 by bolts, a lower pressing frame 430 is installed at the lower end of the connector, and a pushing surface 431 is provided on the inner side of the lower end of the lower pressing frame 430.

[0054] See Figure 8 The connecting member is composed of a sliding ring 432 sleeved on the upper part of the connecting head 41 and a plurality of supporting plates 433 installed between the sliding ring 432 and the lower pressing frame 430.

[0055] See Figure 7 The end of the squeezing rod 311 away from the inner side of the limiting frame 310 is provided with a hemispherical protrusion that cooperates with the pushing surface 431.

[0056] During specific operation, on the basis of conventional compression test of pearl cotton, the pushing part 43 and the extrusion limiting part 31 are cooperated to simulate the test of pearl cotton under collision environment. The specific operation steps are as follows: the pearl cotton with placement groove that has not been tested is placed on the supporting seat 300, and then the sliding ring 432 is installed on the connecting head 41 by bolts. The sliding ring 432 limits the lower pressing frame 430 through multiple support plates 433, and then the hydraulic cylinder is started. The hydraulic cylinder drives the contact part 42 and the pushing part 43 to move back and forth up and down, and the contact part 42 repeatedly squeezes the upper end of the pearl cotton. At the same time, the connecting head 41 drives the lower pressing frame 430 to move up and down through the connecting piece, and the lower pressing frame 430 pushes the hemispherical protrusions on the multiple extrusion rods 311 back and forth through the pushing surface 431. The multiple extrusion rods 311 are forced to move toward the direction of the pearl cotton and reciprocate to extrude the pearl cotton and stretch the corresponding return spring 312 through the corresponding connecting plate. Then, the extrusion rod 311 is reset by the reset spring 312, simulating the test of the pearl cotton in a collision environment. After a certain period of testing, the hydraulic cylinder is released and the rebound of the pearl cotton is observed and recorded.

[0057] See Figure 5 and Figure 7, the four corners of the lower end of the supporting seat 300 are equipped with lifting rods 301 that are slidably connected to the support frame 2, and the lower end of the lifting rod 301 is rotatably connected to the roller 305 through the roller frame. A receiving groove 302 is opened in the supporting seat 300, and a plurality of air outlet holes 303 connected to the receiving groove 302 are opened at the upper end of the supporting seat 300. The supporting part 30 also includes a receiving frame 304 that is slidably connected to the receiving groove 302 and is used to place dry ice.

[0058] See Figure 1 、 Figure 2 and Figure 5 The pearl cotton compression performance testing device also includes a pushing mechanism 5, which is connected to the support frame 2 and is used to push multiple lifting rods 301. The pushing mechanism 5 includes a transmission module 50 connected to the support frame 2. The transmission module 50 is equipped with multiple evenly distributed arc-shaped protrusions 51. The transmission module 50 is an existing conveyor belt device, and the transmission module 50 is externally connected to a drive motor for driving its rotation.

[0059] See Figure 1 、 Figure 2 、 Figure 5 and Figure 8 The pressure mechanism 4 also includes a sealing portion 44 for providing a sealed test environment. The sealing portion 44 includes a sealing top plate 440 installed on the pressure module 40. A bellows 441 is installed at the lower end of the sealing top plate 440. A counterweight frame 442 is installed at the lower end of the bellows 441. The sealing portion 44 also includes a positioning rod 443 symmetrically installed at the front and rear ends of the counterweight frame 442 through an ear seat plate. The upper end of the positioning rod 443 is rotatably connected to a positioning plate 444. A safety valve 445 is installed at the upper end of the sealing top plate 440.

[0060] During specific operation, in the initial state, the two positioning plates 444 are located at the upper end of the sealing top plate 440, and the sealing top plate 440 limits the counterweight frame 442 through the two positioning plates 444 and the two positioning rods 443. Under the environment where the side of the pearl cotton is squeezed, the contact part 42 is placed on the pearl cotton, and then the dry ice is placed in the receiving groove 302, and the pushing mechanism 5 is driven to push the supporting part 30 intermittently, simulating the test of pearl cotton in a cold chain transportation environment. The specific operation steps are: place the pearl cotton that has not been tested and has a placement groove on the upper end of the supporting seat 300, and then place the contact part 42 directly on the pearl cotton without connecting it to the connector 41, and then start the pressure module 40. The pressure module 40 drives the lower pressure frame 430 to drop to the specified height through the connector 41 and the connector, and then places an appropriate amount of dry ice for cooling in the receiving frame 304, and then the receiving frame 3 04 is placed in the receiving tank 302, and the dry ice absorbs a large amount of heat through the sublimation process, thereby playing a cooling role, and the water mist generated by the sublimation of the dry ice is discharged upward through multiple air outlets 303, and then the two positioning plates 444 are rotated, and the positioning plates 444 release the limit on the counterweight frame 442, and the counterweight frame 442 moves downward by its own gravity and fits tightly against the upper end of the support frame 2. At the same time, the counterweight frame 442 stretches the corrugated cover 441, and an insulating film is laid inside the corrugated cover 441. A rubber pad is laid at the lower end of the counterweight frame 442 to increase the sealing between the counterweight frame 442 and the support frame 2. The support frame 2, the counterweight frame 442, the corrugated cover 441 and the sealing top plate 440 form a closed environment for maintaining the environment after the dry ice is cooled, thereby simulating the pearl cotton supporting the items and being located in the cold chain transport box. The safety valve 445 is used to stabilize the pressure of the closed environment.

[0061] Start the driving motor, the driving motor drives the transmission module 50 to rotate, the transmission module 50 drives the multiple arc-shaped protrusions 51 to rotate continuously, the spacing between the two arc-shaped protrusions 51 set apart is consistent with the spacing between the two rows of lifting rods 301, when the multiple arc-shaped protrusions 51 rotate, the adjacent two arc-shaped protrusions 5 push the rollers 305 at the lower ends of the multiple lifting rods 301, and the multiple rollers 305 are forced to drive the supporting seat 300 to rise, the supporting seat 300 drives the pearl cotton and the limit frame 310 to rise, and the limit frame 310 drives the multiple extrusion rods 311 to contact the pushing surface 431 at the lower end of the lower pressing frame 430, and the multiple The squeezing rod 311 is subjected to force and pushes the pearl cotton, simulating the phenomenon of multiple pearl cottons colliding during cold chain transportation. After the multiple rollers 305 are separated from the arc-shaped protrusion 51, the supporting seat 300 drives the pearl cotton and the limit frame 310 to reset, simulating the phenomenon of multiple pearl cottons being bumpy during cold chain transportation, and then simulating the test of pearl cotton in a cold chain transportation environment. After a certain period of testing, the counterweight frame 442 is reset upward and connected to the sealing top plate 440 through the positioning plate 444, and the counterweight frame 442 is re-limited. After removing the contact part 42 from the pearl cotton, the rebound of the pearl cotton is observed and recorded.

[0062] A compression performance testing device can simulate tests in a variety of environments, effectively increasing the types of EPE compression performance tests and improving the diversity and accuracy of testing.

[0063] In addition, the present invention also provides a method for testing the compression performance of pearl cotton, which specifically comprises the following steps:

[0064] S1: Place the EPE foam to be tested on the upper end of the supporting seat 300, and squeeze the limiting portion 31 to limit the EPE foam.

[0065] S2: Connect the contact portion 42 to the connector 41 at the lower end of the pressure module 40 , and the pressure module 40 performs a conventional compression test on the EPE through the contact portion 42 .

[0066] S3: After the test in step S2, the pearl cotton is replaced. On the basis of step S2, the pushing part 43 is connected to the connecting head 41 at the lower end of the pressure module 40. The pressure module 40 drives the pushing part 43 to push the extrusion limit part 31, and the extrusion limit part 31 squeezes the side of the pearl cotton to simulate the test of the pearl cotton in a collision environment.

[0067] S4: After the test in step S3, the EPE is replaced, the contact part 42 is separated from the connector 41, and the contact part 42 is placed directly on the EPE. Then, dry ice is placed in the receiving groove 302, and the pushing mechanism 5 is driven to push the supporting part 30 intermittently, and then combined with step S3 to simulate the test of EPE in a cold chain transportation environment.

[0068] S5: After the multiple tests of the pearl cotton are completed, the test ends.

[0069] In the description of the embodiments of the present invention, it should be noted that the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0070] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0071] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A device for testing the compression performance of pearl cotton, comprising a base plate and a support frame mounted on the base plate, characterized in that: A placement mechanism is connected to the upper end of the support frame, and the placement mechanism includes a supporting portion connected to the upper end of the support frame, and an extrusion limiting portion is connected to the supporting portion; The supporting portion includes a supporting seat placed on the upper end of the supporting frame, and lifting rods are installed at the four corners of the lower end of the supporting seat and are connected to the supporting frame through sliding. A receiving groove is opened in the supporting seat, and a plurality of air outlet holes connected to the receiving groove are opened at the upper end of the supporting seat; A pressure mechanism is connected to the upper end of the support frame, the pressure mechanism includes a pressure module installed on the upper end of the support frame through two support rods, a connector is installed at the lower end of the pressure module, and a contact portion and a pushing portion are detachably connected to the connector; A pushing mechanism, connected to the support frame and used to push the multiple lifting rods; The pressure module, contact part and supporting seat are used for conventional compression testing of EPP. On this basis, they are coordinated with the pushing part and extrusion limit part to simulate the test of EPP in a collision environment. In the environment where the side of EPP is squeezed, the contact part is placed on the EPP, and then dry ice is placed in the receiving tank, and the pushing mechanism is driven to intermittently push the supporting part to simulate the test of EPP in a cold chain transportation environment.

2. A pearl cotton compression performance testing device according to claim 1, characterized in that: The pressure mechanism also includes a sealing portion for providing a sealed test environment. The sealing portion includes a sealing top plate installed on the pressure module. A bellows is installed at the lower end of the sealing top plate, and a counterweight frame is installed at the lower end of the bellows.

3. A pearl cotton compression performance testing device according to claim 1, characterized in that: The pushing mechanism includes a transmission module connected to the support frame, and a plurality of evenly distributed arc-shaped protrusions are installed on the transmission module.

4. A pearl cotton compression performance testing device according to claim 1, characterized in that: The extrusion limiting part includes a limiting frame installed at the upper end of the supporting seat, and a plurality of evenly distributed extrusion rods slide through the wall of the limiting frame. A connecting plate is integrally formed on the surface of the extrusion rod located inside the limiting frame, and a reset spring mounted on the extrusion rod is installed between the connecting plate and the inner end surface of the limiting frame.

5. The device for testing the compression performance of pearl cotton according to claim 1, characterized in that: The contact portion comprises a connecting sleeve sleeved on the connecting head, the connecting sleeve is connected to the connecting head via bolts, and a counterweight pressure plate is installed at the lower end of the connecting sleeve.

6. A pearl cotton compression performance testing device according to claim 4, characterized in that: The pushing portion comprises a connecting piece connected to the connecting head through bolts, a lower pressing frame is installed at the lower end of the connecting piece, and a pushing surface is arranged on the inner side of the lower end of the lower pressing frame.

7. A pearl cotton compression performance testing device according to claim 2, characterized in that: A safety valve is installed on the upper end of the sealing top plate.

8. The device for testing the compression performance of pearl cotton according to claim 1, characterized in that: The lower end of the lifting rod is rotatably connected to a roller through a roller frame.

9. The device for testing the compression performance of pearl cotton according to claim 6, characterized in that: One end of the extrusion rod away from the inner side of the limiting frame is provided with a hemispherical protrusion matched with the pushing surface.

10. A method for testing the compression performance of pearl cotton, characterized in that: The method is completed by using the pearl cotton compression performance testing device as claimed in claim 1, comprising the following steps: S1: Place the EPE foam to be tested on the upper end of the support seat and squeeze the limiting part to limit the EPE foam; S2: Connect the contact part to the connector at the lower end of the pressure module, and the pressure module performs a conventional compression test on the pearl cotton through the contact part; S3: After the test in step S2, the EPE foam is replaced. Based on step S2, the pushing part is connected to the connector at the lower end of the pressure module. The pressure module drives the pushing part to push the extrusion limiter, and the extrusion limiter squeezes the side of the EPE foam to simulate the test of the EPE foam in a collision environment. S4: After the test in step S3, the EPE foam is replaced, the contact part is separated from the connector, and the contact part is placed directly on the EPE foam. Then, dry ice is placed in the receiving tank, and the pushing mechanism is driven to push the supporting part intermittently. Then, in conjunction with step S3, the test of the EPE foam in a cold chain transportation environment is simulated; S5: After the multiple tests of the pearl cotton are completed, the test ends.

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