Edge pressure testing device and operating method

Abstract

The application provides an edge compression testing device and an operating method. The edge compression testing device comprises a base, a positioning part arranged on the base and used for positioning a to-be-tested plate, and a testing part comprising a limiting structure and a movable structure. The limiting structure limits the movable structure on the base with a set force matching a required edge compression. In operation, the to-be-tested plate is moved to make an edge part of the to-be-tested plate press the movable structure. If the movable structure moves and the to-be-tested plate is not deformed, it is determined that the edge compression of the to-be-tested plate meets the requirement. If the to-be-tested plate is deformed, it is determined that the edge compression of the to-be-tested plate does not meet the requirement. In this way, the plate is not damaged, the consumption of the plate is avoided, and the testing method is simple. Compared with the existing edge compression tester, the edge compression testing device has relatively simple structures, is convenient to move and carry, has flexible application scenarios, and is suitable for wide use.

Description

Technical Field

[0001] This invention relates to the field of edge crush strength testing technology for packaging box panels, and more specifically, to an edge crush testing device and operating method. Background Technology

[0002] A common packaging method for products during storage and transportation is stacking multiple boxes on pallets for containerized storage and transshipment. The edge crush strength of the packaging box material directly affects the box's compressive strength. Insufficient edge crush strength leads to inadequate compressive strength, resulting in issues such as box collapse, bulging, and damage during storage and transportation. Therefore, controlling the edge crush strength of packaging boxes is essential.

[0003] Currently, edge crush tests conducted by testing agencies and factories are all destructive tests. The packaging box panels to be tested are cut into small pieces according to national standards and placed on an edge crush tester for measurement. Furthermore, incoming packaging box inspection requires a certain number of boxes to be sampled for testing, meaning that the more packaging boxes received, the more boxes are consumed. The disadvantages of this type of tester are that the equipment is large and inconvenient to move and carry, limiting its application scenarios; at the same time, the test requires damaging the packaging boxes, resulting in a waste of resources and costs. Many factories, in order to reduce the cost of incoming packaging box inspection, do not conduct edge crush strength tests on every batch, resulting in the inability to strictly control the edge crush strength of the packaging boxes. This leads to packaging boxes with insufficient compressive strength entering the production line and being used, causing defects such as box collapse, bulging, and breakage. Summary of the Invention

[0004] This invention provides an edge crush test device and operating method to solve the problems of inconvenient portability of existing sheet metal edge crush testing equipment and the need to damage the sheet metal for edge crush testing.

[0005] To address the aforementioned problems, according to one aspect of the present invention, an edge pressure testing device is provided, comprising: a base; a positioning part disposed on the base, the positioning part being used to position a material to be tested; and a testing part, the testing part including a limiting structure and a movable structure, the limiting structure constraining the movable structure on the base with a set force, the set force being matched with the required edge pressure; wherein, when the pushing force of the material to be tested on the movable structure is greater than the set force, the movable structure moves.

[0006] Furthermore, the movable structure has a cavity below it. When the edge of the test plate is pressed downwards against the movable structure, the movable structure falls into the cavity when it moves.

[0007] Furthermore, the limiting structure is fixed to the base and located below the positioning part, and the movable structure is located below the limiting structure.

[0008] Furthermore, the set force applied by the limiting structure to the movable structure is a suction force, and the magnitude of the set force is adjustable.

[0009] Furthermore, the limiting structure is an electromagnet structure.

[0010] Furthermore, the testing unit also includes a control circuit and a rheostat, with both the limiting structure and the rheostat connected to the control circuit; wherein, the magnitude of the set force generated by the limiting structure is adjusted by adjusting the resistance of the rheostat.

[0011] Furthermore, the testing unit also includes a pressure sensor disposed in the groove of the limiting structure. When the limiting structure holds the movable structure in place, the pressure sensor and the movable structure abut against each other to detect the value of the set force.

[0012] Furthermore, there are multiple limiting structures, and the multiple limiting structures together limit the movable structure with the set force, and the multiple limiting structures all avoid the contact position between the movable structure and the test plate.

[0013] Furthermore, the movable structure and the base are in a sliding fit.

[0014] Furthermore, the base has a sliding groove, and the movable structure is provided with a slide rail, the slide rail and the sliding groove being slidably engaged; or, the base is provided with a slide rail, the movable structure has a sliding groove, and the slide rail and the sliding groove being slidably engaged.

[0015] Furthermore, there are multiple slide grooves and multiple slide rails, and the multiple slide grooves and multiple slide rails are matched one-to-one.

[0016] Furthermore, the groove is a dovetail groove, and the shape of the slide rail matches the groove.

[0017] Furthermore, the positioning part includes at least two positioning members, the distance between the two positioning members being adjustable to clamp or release the plate to be tested.

[0018] Furthermore, the positioning element is plate-shaped, and the plane of the positioning element that mates with the plate to be tested is perpendicular to the surface of the movable structure.

[0019] Furthermore, the positioning element includes a rigid plate and a soft pad, the soft pad being disposed on one side of the rigid plate and used to contact the plate to be tested.

[0020] Furthermore, the positioning part also includes an adjustment component, which is movably disposed on the base. The adjustment component cooperates with the positioning member to adjust the position of the positioning member; wherein each positioning member cooperates with at least one adjustment component.

[0021] Furthermore, the adjusting assembly includes a sleeve and a screw, the sleeve and the screw being threadedly connected, the sleeve being connected to one of the base and the positioning member, and the screw being connected to the other of the base and the positioning member; wherein, the total length of the adjusting assembly is adjusted by the relative rotation of the sleeve and the screw, thereby adjusting the position of the positioning member relative to the base.

[0022] Furthermore, the adjustment assembly also includes a bearing, which is disposed in the mounting hole of the base. One end of the sleeve is connected to the inner ring of the bearing, and the end of the screw away from the sleeve is fixedly connected to the positioning member.

[0023] Furthermore, the base includes a bottom wall, a side wall, and a boss. The side wall is disposed on the bottom wall, and the boss is disposed on the bottom wall. A cavity is formed in the area between the boss and the bottom wall. The positioning part is installed on the bottom wall and located above the boss. The limiting structure is installed on the lower side of the boss. The movable structure is movably disposed within the cavity.

[0024] Furthermore, there are two sidewalls and two bosses. The two sidewalls are arranged opposite each other, and the two bosses are respectively arranged on opposite sides of the two sidewalls. The space between the two bosses is for the plate to be tested to pass through. There are two limiting structures, and the two limiting structures are respectively installed on the lower side of the two bosses.

[0025] According to another aspect of the present invention, an operating method is provided for the above-described edge pressure testing device. The operating method includes: adjusting the value of a set force of the limiting structure according to the required edge pressure, so as to limit the movable structure on the base by the set force; positioning the test plate by the positioning part so that the test plate is perpendicular to the movable structure; pushing the test plate toward the movable structure so that the edge of the test plate presses against the movable structure; wherein, if the movable structure moves and the test plate does not deform, it is determined that the edge pressure of the test plate meets the requirements; if the test plate deforms, it is determined that the edge pressure of the test plate does not meet the requirements.

[0026] Furthermore, the set force generated by the limiting structure is an electromagnetic attraction force, and the electromagnetic attraction force corresponding to the required edge pressure is obtained by the following calibration method: positioning the standard plate with the required edge pressure through the positioning part; adjusting the value of the electromagnetic attraction force multiple times and pressing the edge material of the standard plate against the movable structure; wherein, when the standard plate can just push the movable structure to move and the standard plate does not deform, the corresponding value of the electromagnetic attraction force is the value of the electromagnetic attraction force corresponding to the required edge pressure.

[0027] Furthermore, the calibration method also includes: operating on standard plates of different materials or specifications to obtain electromagnetic attraction forces corresponding to different required edge pressures, and drawing a table comparing required edge pressures with electromagnetic attraction forces.

[0028] The present invention provides an edge crush test device, comprising: a base; a positioning part disposed on the base for positioning the test plate; and a test part including a limiting structure and a movable structure. The limiting structure uses a set force to confine the movable structure to the base, and the set force matches the required edge crush. During operation, the test plate is moved to cause the edge of the test plate to press against the movable structure. If the movable structure moves and the test plate does not deform, the edge crush of the test plate is determined to meet the requirements. If the test plate deforms, the edge crush of the test plate is determined to not meet the requirements. The edge crush test device provided in this solution does not employ the destructive testing method of existing edge crush testers to determine the edge crush strength of sheet materials. Instead, it tests whether the sheet material meets the required edge crush strength. Specifically, the sheet material is positioned by a positioning unit, and the sheet material is moved to compress the movable structure with its edges. Since the set force matches the required edge crush strength, if the movable structure moves and the sheet material does not deform, the edge crush strength of the sheet material is considered to meet the requirements; if the sheet material deforms, the edge crush strength is considered to not meet the requirements. In other words, conditions and references are set in advance, and the edge crush strength of the sheet material is determined by observing whether the sheet material pushes the movable structure to move and whether it deforms. This method avoids damaging the sheet material, thus preventing material waste. The testing method is simple, and the edge crush strength of the sheet material can be determined without obtaining the edge crush strength value, which indicates whether the sheet material is qualified. Due to the reduced requirements, compared with existing edge crush testers, the structure of the edge crush test device is simpler, easier to move and carry, and more flexible in application scenarios. Therefore, this solution solves the problems of inconvenient portability of existing sheet metal edge pressure testing equipment and the need to damage the sheet metal for edge pressure testing, reducing the difficulty of operation, operating costs and equipment costs, and is suitable for widespread use.

[0029] The applied force is set to the force corresponding to a standard plate with the required pressure; that is, the standard plate should be able to push the movable structure to move without deforming. The applied force value is the required value. When testing the plate to be tested, it is equivalent to indirectly comparing the plate to the standard plate. If the plate to be tested can push the movable structure to move without deformation at the edges, the edge crush strength of the plate to be tested has reached the edge crush strength of the standard plate, and the plate to be tested is considered qualified. If the plate to be tested cannot push the movable structure to move, and the reaction force of the movable structure causes deformation, the edge crush strength of the plate to be tested is poor, and the plate to be tested is unqualified. If the plate to be tested can push the movable structure to move, but the reaction force of the movable structure causes deformation at the edges, the edge crush strength of the plate to be tested also does not meet the requirements, and the plate to be tested is unqualified. This edge crush test device is easy to operate and provides accurate results.

[0030] The edge crush test device proposed in this invention is simple in structure, small in size, easy to use, and has low manufacturing and procurement costs. Its application scenarios are not limited, and it does not require fixed-point testing, making it suitable for use in smaller factories. Its greatest advantage is that, compared to traditional edge crush testers, it does not require damaging the tested material or packaging box, nor does it require cutting the tested material into small pieces to measure and verify edge crush strength. After the measurement, if the strength meets the standard, the tested material or packaging box can still be used, greatly reducing testing costs. This solves the problem that most factories do not perform edge crush strength testing on incoming raw materials due to expensive testing equipment and high testing costs, preventing substandard materials from being used in production and reducing the frequency of defects such as box collapse, bulging, crushing, and breakage. Attached Figure Description

[0031] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 A schematic diagram showing the interaction between the edge crush testing device and the plate to be tested according to an embodiment of the present invention is shown;

[0033] Figure 2 It shows Figure 1 A three-dimensional view of the edge pressure testing device in the image;

[0034] Figure 3 It shows Figure 2 A front view of the edge pressure testing device in the image;

[0035] Figure 4 It shows Figure 2 A schematic diagram illustrating the coordination between the limiting structure and the movable structure in the diagram;

[0036] Figure 5 It shows Figure 4 Side view;

[0037] Figure 6 It shows Figure 2 A schematic diagram of the positioning part in the middle;

[0038] Figure 7 It shows Figure 2 A schematic diagram of the base structure.

[0039] The above figures include the following reference numerals:

[0040] 10. Base; 11. Cavity; 12. Slide groove; 13. Bottom wall; 14. Side wall; 15. Boss; 16. Mounting hole;

[0041] 20. Positioning part; 21. Positioning component; 211. Rigid plate; 212. Soft pad; 22. Adjusting assembly; 221. Sleeve; 222. Screw; 223. Bearing;

[0042] 30. Testing section; 31. Limiting structure; 32. Movable structure; 33. Pressure sensor; 34. Slide rail. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] like Figures 1 to 7As shown, an embodiment of the present invention provides an edge crush test device, including: a base 10; a positioning part 20 disposed on the base 10, the positioning part 20 being used to position the plate to be tested; and a test part 30, the test part 30 including a limiting structure 31 and a movable structure 32, the limiting structure 31 limiting the movable structure 32 on the base 10 with a set force, the set force matching the required edge crush; wherein, when the pushing force of the plate to be tested on the movable structure 32 is greater than the set force, the movable structure 32 moves. Thus, by observing the movement of the movable structure 32 and whether the plate to be tested deforms, it can be determined whether the edge crush of the plate to be tested has reached the required edge crush strength, that is, whether the edge crush meets the usage requirements. Specifically, during operation, the plate to be tested is moved so that the edge material of the plate to be tested presses against the movable structure 32. If the movable structure 32 moves and the plate to be tested does not deform, it is determined that the edge crush of the plate to be tested meets the requirements; if the plate to be tested deforms (regardless of whether the movable structure 32 moves), it is determined that the edge crush of the plate to be tested does not meet the requirements.

[0045] The edge crush test device provided in this solution does not employ the destructive testing method of existing edge crush testers to determine the edge crush of sheet materials. Instead, it tests whether the sheet material meets the required edge crush requirements. Specifically, the sheet material to be tested is positioned by the positioning unit 20, and the sheet material is moved so that its edge material compresses the movable structure 32. Since the set force matches the required edge crush, if the movable structure 32 moves and the sheet material does not deform, the edge crush of the sheet material is judged to meet the requirements; if the sheet material deforms, the edge crush of the sheet material is judged to not meet the requirements. That is, conditions and references are set in advance, and the edge crush of the sheet material is determined by observing whether the sheet material can push the movable structure 32 to move and whether the sheet material deforms. This method does not require damaging the sheet material, avoiding material waste. The testing method is simple, and the edge crush strength of the sheet material can be determined without obtaining the edge crush strength value of the sheet material, that is, whether the sheet material is qualified. Due to the reduced requirements, compared with existing edge crush testers, the structure of each part of the edge crush test device is simpler, easier to move and carry, and more flexible in application scenarios. Therefore, this solution solves the problems of inconvenient portability of existing sheet metal edge pressure testing equipment and the need to damage the sheet metal for edge pressure testing, reducing the difficulty of operation, operating costs and equipment costs, and is suitable for widespread use.

[0046] The applied force is set to the force corresponding to a standard plate with the required pressure; that is, the standard plate can just push the movable structure 32 to move without deforming. The applied force value is the value that needs to be set. Thus, when testing the plate to be tested, it is equivalent to indirectly comparing the plate to the standard plate. If the plate to be tested can push the movable structure 32 to move without deforming its edges, the edge crush strength of the plate to be tested has reached the edge crush strength of the standard plate, and the plate to be tested can be considered qualified. If the plate to be tested cannot push the movable structure 32 to move, and the reaction force of the movable structure 32 causes deformation, the edge crush strength of the plate to be tested is poor, and the plate to be tested is unqualified. If the plate to be tested can push the movable structure 32 to move, but the reaction force of the movable structure 32 causes deformation of the edges, the edge crush strength of the plate to be tested also does not meet the requirements, and the plate to be tested is unqualified. This edge crush test device is easy to operate and provides accurate judgment.

[0047] In this design, the movable structure 32 can move horizontally or vertically, and the direction of movement of the test material corresponds to that of the movable structure 32. The test material can be slowly pushed by the operator's hand, eliminating the need for a drive structure and simplifying the edge pressure testing device. The limiting structure 31 limits the movable structure 32 in the same direction as its movement, and can limit it in any desired direction, such as horizontally or vertically. The set force applied by the limiting structure 31 to the movable structure 32 can be a pushing force, a pulling force, a negative pressure suction force, or an electromagnetic suction force. The limiting structure 31 can be mounted on the base 10 or on other structures.

[0048] like Figure 1 As shown, in one specific embodiment, the movable structure 32 has a cavity 11 below it. When the edge of the test material is pressed downwards against the movable structure 32, the movable structure 32 falls into the cavity 11 when it moves. Using this method, when the test material can push the movable structure 32, the movable structure 32 falls into the cavity 11. This makes the positional change of the movable structure 32 obvious and rapid, allowing operators to easily and quickly detect the change, thereby improving the efficiency and convenience of judging whether the test material is qualified.

[0049] Specifically, the limiting structure 31 is fixed to the base 10 and located below the positioning part 20, while the movable structure 32 is located below the limiting structure 31. This arrangement leaves no obstruction below the movable structure 32, making it easy for it to fall off when the test material pushes it.

[0050] Specifically, the force exerted by the test plate on the movable structure 32 is perpendicular to the surface of the movable structure 32, and the force exerted by the test plate on the movable structure 32 is opposite to the direction of the set force applied by the limiting structure 31 to the movable structure 32. Thus, when the force exerted by the test plate on the movable structure 32 is greater than the set force, the test plate can push the movable structure 32 to move, and the movable structure 32 falls from the limiting position.

[0051] Specifically, the limiting structure 31 applies a set force of suction to the movable structure 32, and the magnitude of the set force is adjustable. This allows for flexible adjustment of the set force according to the required edge pressure of the test plate of different specifications or materials, thus making the edge pressure testing device applicable to test plates of different specifications or materials, improving its versatility. The suction force can be generated by negative gas pressure or by electromagnetic force, etc.

[0052] In one specific embodiment, the limiting structure 31 is an electromagnet structure. Thus, the setting force of the limiting structure 31 is electromagnetic attraction. Using this approach, the magnitude of the electromagnetic attraction is easily controlled, for example, by adjusting the current, voltage, or resistance, and with high precision. Furthermore, this method results in a circuit-like testing unit 30, which is small in size, easy to move, and flexible in application scenarios. The power source for the testing unit 30 can be a battery or AC power.

[0053] Specifically, the testing unit 30 also includes a control circuit and a rheostat. Both the limiting structure 31 and the rheostat are connected to the control circuit. The magnitude of the set force generated by the limiting structure 31 is adjusted by adjusting the resistance of the rheostat. In this way, the magnitude of the electromagnetic attraction force generated by the limiting structure 31, i.e., the set force, can be adjusted by adjusting the resistance of the rheostat. This method is simple in structure, convenient to operate, and requires low skill from the operator.

[0054] like Figure 4 As shown, the testing unit 30 also includes a pressure sensor 33, which is disposed in the groove of the limiting structure 31. When the limiting structure 31 holds the movable structure 32 in place, the pressure sensor 33 and the movable structure 32 come into contact to detect the value of the set force. The value of the set force can be indirectly detected by the pressure sensor 33, so that the set force can be adjusted to the required value according to the detection results.

[0055] The pressure sensor 33 is installed in the groove at the bottom of the limiting structure 31, with its sensing position in contact with the movable structure 32. Adjusting the resistance of the variable resistor controls the current flowing through the limiting structure 31, thereby adjusting the electromagnetic attraction between the limiting structure 31 and the movable structure 32. The smaller the resistance of the variable resistor, the larger the current, and the greater the electromagnetic attraction between the limiting structure 31 and the movable structure 32. The magnitude of the electromagnetic attraction is indirectly obtained through the pressure sensor 33.

[0056] Optionally, the edge pressure testing device also includes a display screen for displaying the real-time value of the set force. It should be noted that the pressure value detected by the pressure sensor 33 is not necessarily directly equal to the set force value. Depending on the setting method, there may be a difference between the pressure value and the set force value, such as the weight of the movable structure 32 or the weight of the plate being tested. This difference is either predetermined or known. The value displayed on the screen is the sum of the pressure value and the difference, thus providing the real-time value of the set force for operator reference and improving operational convenience and accuracy.

[0057] like Figures 1 to 5 As shown, there are multiple limiting structures 31. These multiple limiting structures 31 collectively constrain the movable structure 32 with a set force, and all of them avoid contact between the movable structure 32 and the test material. The multiple limiting structures 31 provide more stable position control for the movable structure 32, and their coordination with different positions on the movable structure 32 ensures uniform force distribution. Specifically, the multiple limiting structures 31 coordinate with different positions on the edges of the movable structure 32, avoiding the central area of ​​the movable structure 32. The test material presses against the central part of the movable structure 32, resulting in a more uniform force distribution on the movable structure 32, which improves the accuracy of the test.

[0058] The movable structure 32 and the base 10 are slidably coupled, so that the base 10 can guide the movement of the movable structure 32, preventing the movable structure 32 from moving randomly and affecting the test results and the judgment of the test plate.

[0059] Specifically, the sliding engagement between the movable structure 32 and the base 10 can be as follows: the base 10 has a groove 12, and the movable structure 32 is provided with a slide rail 34, with the slide rail 34 and the groove 12 slidingly engaged; or the base 10 is provided with a slide rail 34, and the movable structure 32 has a groove 12, with the slide rail 34 and the groove 12 slidingly engaged. In this way, the movable structure 32 moves along the extension direction of the slide rail 34, wherein the extension direction of the slide rail 34 is the same as the direction of the force applied to the test plate.

[0060] like Figure 4 , Figure 5 and Figure 7 As shown, there are multiple slide grooves 12 and multiple slide rails 34, with each slide groove 12 and slide rail 34 corresponding to each other. The cooperation of multiple slide grooves 12 and multiple slide rails 34 improves the guiding effect on the movable structure 32, making the movement of the movable structure 32 smooth and stable.

[0061] Specifically, the slide groove 12 is a dovetail groove, and the shape of the slide rail 34 matches the slide groove 12. In this way, the slide rail 34 and the slide groove 12 have high matching precision, good guiding effect, and are not easy to disengage.

[0062] In this design, the positioning unit 20 includes at least two positioning members 21, the distance between which is adjustable to clamp or release the test material. This clamping of the test material by the two positioning members 21 achieves positioning. The purpose of this positioning is to define the initial position of the test material, aligning it with the movable structure 32, thereby facilitating subsequent operations of moving the test material and pushing the movable structure 32. The clamping of the test material by the positioning members 21 does not fix the material in place; the test material can move when the operator gently pushes it.

[0063] Specifically, the positioning element 21 is plate-shaped, and the plane of the positioning element 21 that mates with the plate to be tested is perpendicular to the surface of the movable structure 32. This results in a large contact area between the positioning element 21 and the plate to be tested, leading to a good positioning effect. Furthermore, the fact that the plane of the positioning element 21 mates with the plate to be tested is perpendicular to the surface of the movable structure 32 ensures that the pressure exerted by the plate to be tested on the movable structure 32 is perpendicular to the surface of the movable structure 32.

[0064] The positioning element 21 includes a rigid plate 211 and a soft pad 212. The soft pad 212 is disposed on one side of the rigid plate 211 and is used to contact the material to be tested. In this way, the rigid plate 211 ensures the structural strength of the positioning element 21, and the contact between the soft pad 212 and the material to be tested avoids damage to the material. The rigid plate 211 can be a metal plate or a plastic plate, and the soft pad 212 can be made of sponge, rubber, EVA, etc.

[0065] In this design, the positioning unit 20 further includes an adjustment component 22, which is movably mounted on the base 10. The adjustment component 22 cooperates with the positioning element 21 to adjust the position of the positioning element 21; wherein each positioning element 21 cooperates with at least one adjustment component 22. Thus, the position of the positioning element 21 can be adjusted by the adjustment component 22, thereby positioning the material to be tested. The adjustment component 22 may employ a telescopic structure, etc.

[0066] Specifically, such as Figure 6As shown, the adjusting assembly 22 includes a sleeve 221 and a screw 222, which are threaded together. The sleeve 221 is connected to one of the base 10 and the positioning member 21, and the screw 222 is connected to the other of the base 10 and the positioning member 21. The total length of the adjusting assembly 22 is adjusted by the relative rotation of the sleeve 221 and the screw 222, thereby adjusting the position of the positioning member 21 relative to the base 10. By adjusting the total length of the adjusting assembly 22 by the relative rotation of the sleeve 221 and the screw 222, the position of the positioning member 21 can be adjusted. This method is simple to operate and has high displacement accuracy.

[0067] Furthermore, the adjusting assembly 22 also includes a bearing 223, which is disposed within the mounting hole 16 of the base 10. One end of the sleeve 221 is connected to the inner ring of the bearing 223, and the end of the screw 222 away from the sleeve 221 is fixedly connected to the positioning member 21. By providing the bearing 223, the sleeve 221 can be easily rotated, reducing operating resistance.

[0068] Specifically, each positioning element 21 is connected to two adjustment components 22, which can improve the support effect of the adjustment components 22 on the positioning element 21, and the positioning element 21 will not rotate when the sleeve 221 is rotated.

[0069] like Figure 2 and Figure 7 As shown, the base 10 includes a bottom wall 13, a side wall 14, and a boss 15. The side wall 14 is disposed on the bottom wall 13, and the boss 15 is disposed on the bottom wall 13. The area between the boss 15 and the bottom wall 13 forms a cavity 11. A positioning part 20 is installed on the bottom wall 13 and located above the boss 15. A limiting structure 31 is installed on the lower side of the boss 15, and a movable structure 32 is movably disposed within the cavity 11. This structure facilitates the arrangement of different components and results in a simple and low-cost edge pressure testing device.

[0070] Specifically, there are two sidewalls 14 and two bosses 15. The two sidewalls 14 are arranged opposite each other, and the two bosses 15 are respectively located on opposite sides of the two sidewalls 14. The space between the two bosses 15 is for the plate to be tested to pass through. There are two limiting structures 31, which are respectively installed on the lower side of the two bosses 15. This improves the limiting effect of the limiting structures 31 on the movable structure 32.

[0071] The edge crush test device proposed in this invention is simple in structure, small in size, easy to use, and has low manufacturing and procurement costs. Its application scenarios are not limited, and it does not require fixed-point testing, making it suitable for use in smaller factories. Its greatest advantage is that, compared to traditional edge crush testers, it does not require damaging the tested material or packaging box, nor does it require cutting the tested material into small pieces to measure and verify edge crush strength. After the measurement, if the strength meets the standard, the tested material or packaging box can still be used, greatly reducing testing costs. This solves the problem that most factories do not perform edge crush strength testing on incoming raw materials due to expensive testing equipment and high testing costs, preventing substandard materials from being used in production and reducing the frequency of defects such as box collapse, bulging, crushing, and breakage.

[0072] In another aspect, the present invention provides an operating method for the aforementioned edge pressure testing device. The operating method includes: adjusting the value of the set force of the limiting structure 31 according to the required edge pressure, so as to limit the movable structure 32 on the base 10 by the set force; positioning the test plate by the positioning part 20 so that the test plate is perpendicular to the movable structure 32; pushing the test plate toward the movable structure 32 so that the edge of the test plate presses against the movable structure 32; wherein, if the movable structure 32 moves and the test plate does not deform, it is determined that the edge pressure of the test plate meets the requirements; if the test plate deforms, it is determined that the edge pressure of the test plate does not meet the requirements.

[0073] This method departs from the existing destructive testing of edge crush strength using edge crush testers. Instead, it tests whether the plate meets the required edge crush strength. Specifically, the plate is positioned using the positioning unit 20, and the plate is moved to compress the edge material of the movable structure 32. Since the set force matches the required edge crush strength, if the movable structure 32 moves and the plate does not deform, the edge crush strength is considered to meet the requirement; if the plate deforms, the edge crush strength is considered to not meet the requirement. In other words, conditions and references are pre-set, and the edge crush strength of the plate is determined by observing whether the plate can move the movable structure 32 and whether the plate deforms. This method avoids damaging the plate, thus preventing material waste. The testing method is simple, and the edge crush strength of the plate can be determined without obtaining the edge crush strength value, indicating whether the plate is qualified. Due to the reduced requirements, simple operation, and flexible application scenarios, the method reduces operational difficulty, operating costs, and equipment costs, making it suitable for widespread use.

[0074] The set force generated by the limiting structure 31 is an electromagnetic attraction force. The electromagnetic attraction force corresponding to the required edge pressure is obtained by the following calibration method: the standard plate with the required edge pressure is positioned by the positioning part 20; the value of the electromagnetic attraction force is adjusted multiple times and the edge material of the standard plate is pressed against the movable structure 32; the value of the electromagnetic attraction force corresponding to the required edge pressure is the value of the electromagnetic attraction force when the standard plate can just push the movable structure 32 to move without deforming. In this way, by using the standard plate as a reference, the set force can be obtained relatively easily, and the electromagnetic attraction force method facilitates adjustment, after which testing can be performed.

[0075] To improve operational convenience and versatility, the calibration method also includes: operating on standard plates of different materials or specifications to obtain the electromagnetic attraction force corresponding to different required edge pressures, and drawing a table of required edge pressures and electromagnetic attraction forces. This way, when subsequently testing standard plates of different materials or specifications, the required electromagnetic attraction force can be obtained by referring to the table, improving operational efficiency, convenience, and versatility.

[0076] The above-mentioned solution provided by the present invention has the following characteristics and technical effects.

[0077] First, “test stage size calibration” replaces “sample size calibration”.

[0078] Existing edge crush testers require the packaging material to be tested to be cut into samples of fixed dimensions, and then the samples are fixed onto the test platform for measurement. The compression length is controlled by calibrating the sample dimensions, and then the edge crush strength per unit length is calculated. The accuracy of the sample dimensions directly affects the measurement results, so the requirements for sample preparation are strict, resulting in low measurement efficiency, complex testing methods, and damage to the structure of the packaging being tested, as well as high measurement costs.

[0079] The device proposed in this invention eliminates the need to cut the packaging into small samples. Instead, it controls the compression length by calibrating the test platform (i.e., the base). Furthermore, the area above the test platform is open, allowing for flexibility in the size of the packaging. No sample preparation is required before testing, simplifying the testing process and improving efficiency. During testing, a non-load-bearing side of the packaging can be selected. This ensures that even if the packaging develops slight indentations during the test, the overall compressive strength of the packaging remains unaffected, allowing it to be used without incurring additional testing costs.

[0080] Second, "preset the required edge crush strength value" replaces "measure the actual edge crush strength value of the sample".

[0081] The existing edge crush tester works by crushing the test sample, reading the pressure sensor value at the time of crushing, and then calculating the edge crush strength of the test sample. Since it measures the ultimate compressive strength of the sample, it is necessary to crush the test sample.

[0082] The device proposed in this invention does not require measuring the ultimate compressive strength of the test sample. Instead, it uses an electromagnetic device to preset an electromagnetic attraction value, which corresponds to the edge compressive strength that the sample needs to achieve. If the sample can push the movable structure off the base until it detaches, it indicates that the compressive strength of the test sample meets the requirements. In this way, the test sample does not need to be crushed, the structural strength of the test sample is not damaged, and it can still be used after the test.

[0083] Third, "electromagnets" replaced "cylinder transmission devices".

[0084] The existing edge crush tester consists of a cylinder drive mechanism and a pressure sensor. The cylinder drive mechanism is connected to a pressure plate on the test platform. When the pressure plate contacts the sample, the cylinder drive mechanism continuously applies pressure until the sample is crushed. The pressure sensor measures the pressure, and thus the edge crush strength of the sample is obtained. The disadvantages of this device are that it occupies a large space and has a high manufacturing cost.

[0085] The device proposed in this invention consists of an electromagnet and a pressure sensor. Since the base does not need to move, but the measurement process is achieved by manually moving the test sample, the transmission mechanism of the device can be eliminated, and a simpler electromagnet can be used to provide a certain attraction force. Because the electromagnet has a simple structure, occupies little space, and has low manufacturing cost, the overall device structure is simple, portable, and has low manufacturing cost.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0087] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0088] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0089] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

Claims

1. An edge crush test device characterized by, The edge pressure testing device comprises a base (10), a positioning part (20) arranged on the base (10) and used for positioning a to-be-tested board, and a testing part (30) comprising a limiting structure (31), a movable structure (32), a control circuit and a variable resistor, wherein the limiting structure (31) limits the movable structure (32) on the base (10) with a set acting force, the limiting structure (31) and the variable resistor are both connected to the control circuit, and the set acting force matches a required edge pressure. When the to-be-tested board exerts a greater pushing force on the movable structure (32) than the set acting force, the movable structure (32) moves. The movable structure (32) is provided with a cavity (11) below, and the edge of the to-be-tested board pushes down the movable structure (32), and the movable structure (32) falls into the cavity (11) when it moves. The set acting force exerted by the limiting structure (31) on the movable structure (32) is suction force, and the size of the set acting force can be adjusted, wherein the size of the set acting force generated by the limiting structure (31) is adjusted by adjusting the resistance of the variable resistor. The limiting structure (31) is fixed on the base (10) and located below the positioning part (20), and the movable structure (32) is located below the limiting structure (31). The limiting structure (31) is an electromagnet structure. The testing part (30) further comprises a pressure sensor (33) arranged in a groove of the limiting structure (31), and the pressure sensor (33) and the movable structure (32) abut to detect the value of the set acting force when the limiting structure (31) holds the movable structure (32).

2. The edge crush test apparatus of claim 1, wherein, The limiting structure (31) is a plurality of limiting structures (31) that collectively limit the movable structure (32) with the set acting force, and the plurality of limiting structures (31) avoid the contact position of the movable structure (32) and the to-be-tested board.

3. The edge crush test apparatus of claim 1, wherein, The movable structure (32) and the base (10) are in sliding fit.

4. The edge crush test apparatus of claim 1, wherein, 7. The edge pressure testing device according to claim 6, wherein the base (10) is provided with a sliding groove (12), the movable structure (32) is provided with a sliding rail (34), and the sliding rail (34) and the sliding groove (12) are in sliding fit; or the base (10) is provided with a sliding rail (34), the movable structure (32) is provided with a sliding groove (12), and the sliding rail (34) and the sliding groove (12) are in sliding fit.

5. The edge crush test apparatus of claim 1, wherein, The sliding groove (12) and the sliding rail (34) are both a plurality of sliding grooves (12) and a plurality of sliding rails (34) that are correspondingly matched one by one.

6. The edge crush test apparatus of claim 1, wherein, The sliding groove (12) is a dovetail groove, and the shape of the sliding rail (34) matches the sliding groove (12). The positioning part (20) comprises at least two positioning members (21), and the distance between the two positioning members (21) is adjustable to clamp or release the to-be-tested board. ​ ​ 8. The edge crush test apparatus of claim 7, wherein, ​ 9. The edge crush test apparatus of claim 7, wherein, ​ 10. The edge crush test apparatus of claim 1, wherein, ​ 11. The edge crush test apparatus of claim 10, wherein, The positioning member (21) is plate-shaped, and a plane of the positioning member (21) that is matched with the plate to be measured is perpendicular to a surface of the movable structure (32).

12. The edge crush test apparatus of claim 10, wherein, The positioning member (21) comprises a rigid plate (211) and a soft pad (212), the soft pad (212) is arranged on one side of the rigid plate (211), and the soft pad (212) is used to contact the plate to be measured.

13. The edge crush test apparatus of claim 10, wherein, The positioning part (20) further comprises an adjusting assembly (22), the adjusting assembly (22) is movably arranged on the base (10), the adjusting assembly (22) is matched with the positioning member (21) to adjust the position of the positioning member (21), and each positioning member (21) is matched with at least one adjusting assembly (22).

14. The edge crush test apparatus of claim 13, wherein, The adjusting assembly (22) comprises a sleeve (221) and a screw rod (222), the sleeve (221) and the screw rod (222) are threadedly connected, the sleeve (221) is connected with the base (10) and one of the positioning members (21), the screw rod (222) is connected with the base (10) and the other of the positioning members (21), and the total length of the adjusting assembly (22) is adjusted through relative rotation of the sleeve (221) and the screw rod (222), so that the position of the positioning member (21) relative to the base (10) is adjusted.

15. The edge crush test apparatus of claim 14, wherein, The adjusting assembly (22) further comprises a bearing (223), the bearing (223) is arranged in the mounting hole (16) of the base (10), one end of the sleeve (221) is connected with an inner ring of the bearing (223), and the screw rod (222) is fixedly connected with the positioning member (21) away from the other end of the sleeve (221).

16. The edge crush test apparatus of claim 1, wherein, The base (10) comprises a bottom wall (13), a side wall (14) and a boss (15), the side wall (14) is arranged on the bottom wall (13), the boss (15) is arranged on the bottom wall (13), and a region between the boss (15) and the bottom wall (13) forms a cavity (11); the positioning part (20) is mounted on the bottom wall (13) and located above the boss (15), the limiting structure (31) is mounted on the lower side of the boss (15), and the movable structure (32) is movably arranged in the cavity (11).

17. The edge crush test apparatus of claim 16, wherein, The side wall (14) and the boss (15) are both two, the two side walls (14) are oppositely arranged, the two bosses (15) are arranged on opposite sides of the two side walls (14) respectively, a space between the two bosses (15) is used for the plate to be measured to pass through, and the limiting structure (31) is two, and the two limiting structures (31) are mounted on the lower sides of the two bosses (15) respectively.

18. An operating method, characterized by The operation method is used for the edge pressure testing device in any one of claims 1 to 17, and the operation method comprises: According to the required edge pressure, the value of the set force of the limiting structure (31) is adjusted, so that the movable structure (32) is limited on the base (10) through the set force; The positioning part (20) is used to position the plate to be tested, so that the plate to be tested is perpendicular to the movable structure (32); The plate to be tested is pushed towards the movable structure (32), so that the edge of the plate to be tested presses the movable structure (32); if the movable structure (32) moves and the plate to be tested is not deformed, it is determined that the edge pressure of the plate to be tested meets the requirements; if the plate to be tested is deformed, it is determined that the edge pressure of the plate to be tested does not meet the requirements.

19. The method of operation of claim 18, wherein, The setting force generated by the limiting structure (31) is electromagnetic attraction, and the electromagnetic attraction corresponding to the required edge pressure is obtained by the following calibration method: The standard plate with the required edge pressure is positioned by the positioning part (20); The value of the electromagnetic attraction is adjusted multiple times, and the edge of the standard plate presses the movable structure (32); in the case that the standard plate can just push the movable structure (32) to move and the standard plate is not deformed, the value of the electromagnetic attraction corresponding to the required edge pressure is obtained.

20. The method of claim 19, wherein, The calibration method further comprises: operating on standard plates of different materials or different specifications to obtain electromagnetic attractions corresponding to different required edge pressures, and drawing a required edge pressure-electromagnetic attraction table.

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