Packaging paper strength detection device based on mechanical sensing

Abstract

The invention relates to the technical field of strength detection, in particular to a packaging paper strength detection device based on mechanical sensing, which comprises a test board and a pair of rolling racks, the rolling racks are used for rolling packaging paper and spreading the packaging paper, a pair of clamping racks is slidably connected above the test board, clamped paper is divided into a plurality of detection areas, a detection part is suspended right above each detection area, and the detection parts are used for detecting the strength of the packaging paper. The detection part comprises a hollow cuboid detection box and detection edge blocks rotationally connected to the front and rear inner walls of the detection box; a thin film pressure sensor is embedded in a contact area of the central shaft of the detection edge block and the detection box. The states of the detection edge block and the detection box are switched through rotation of the adjusting handle, edge pressure, flat pressure and sharp pressure are formed, simulation of three typical stress states of edge pressure, flat surface pressure and sharp corner puncture pressure possibly encountered by packaging paper when the packaging paper wraps an object is completed, and the film pressure sensor is used for recording and analyzing the stress condition of the paper. The technical effect of truly evaluating the strength of the packaging paper in different stress scenes is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of strength detection, in particular to a packaging paper strength detection device based on mechanical sensing. BACKGROUND

[0002] Packaging paper is commonly used to package hard objects such as books and boxes for protection and transportation. Therefore, the strength of the packaging paper is a key indicator of its protection performance, which directly affects its ability to resist tearing, puncturing and pressure resistance during use. The application number CN201921982038.8 discloses a packaging paperboard strength detection device, which comprises a support and a detection box. The bottom of the support is fixedly connected with a base, and the top of the support is bolted with a baffle and a detection box. One side of the baffle is provided with a rotating shaft, and the outer side of the rotating shaft is connected with a conveying belt. The outer side of the conveying belt is provided with a detection port, and the detection port penetrates through the detection box. The inside of the detection box is provided with a top plate. The bottom of the top plate is electrically connected with a first detector and a second detector. The bottom of the first detector is provided with a first load block, and the bottom of the second detector is provided with a second load block. The inside of the first load block is electrically connected with a first stress sensor. The maximum pressure that the paperboard can withstand is detected by the stress sensor.

[0003] The above-mentioned paperboard strength detection device disclosed by the patent solves the problem of basic pressure detection, but the operation is complicated and the efficiency is low. The single sheet of paper needs to be repeatedly fed, positioned and tested, and continuous automatic detection cannot be realized. The sample utilization rate is low, and time and effort are wasted. The detection state is single. Only simple vertical pressure test can be carried out, and the test result is not consistent with the actual application scene. Therefore, an efficient, continuous and multi-state simulation packaging paper strength detection device is needed to more comprehensively and truly evaluate the performance of the packaging paper. SUMMARY

[0004] In order to overcome the defects in the prior art, the purpose of the present application is to provide a packaging paper strength detection device based on mechanical sensing. Different pressure structures are switched by the detection part, and the paper is simulated to bear multiple stress states such as edge pressure, sharp corner puncture pressure and plane pressure. The strength of the packaging paper under different stress scenarios is more comprehensively and truly evaluated to solve the problems raised in the above background.

[0005] To achieve the above-mentioned object, the present invention provides a packaging paper strength testing device based on mechanical sensing, comprising a test table and a pair of roll racks mounted on the left and right ends of its top surface for rolling up the packaging paper and laying it flat; a pair of clamping racks are slidably connected above the test table for clamping the laid-flat packaging paper up and down, and dividing the packaging paper into a plurality of testing areas; a testing unit is suspended directly above each testing area, and the testing unit comprises a testing box in the form of a hollow rectangular parallelepiped, a testing edge block rotatably connected to the front and rear inner walls of the testing box, an adjustment handle coaxially connected to the outer end of the central axis of the testing edge block, and a positioning rod positioned and plugged into the side wall of the outer end of the central axis of the testing edge block; a thin film pressure sensor is embedded in the contact area between the central axis of the testing edge block and the testing box; The detection edge block is a right-angled triangular prism structure, forming an edge pressure state; a detection cone is embedded in the middle of the inclined surface corresponding to the right-angled edge of the detection edge block, and the detection cone has three faces, and the top angle of each face is a right angle, forming a sharp pressure state; the bottom surface of the detection box is provided with an avoidance opening, and the side edge of the right-angled edge of the detection edge block is rotatably adapted to be engaged with the avoidance opening, forming a flat pressure state; A water spray part is provided under the test bench, and the water spray part includes a number of water collecting boxes correspondingly arranged directly below the number of detection areas, a number of nozzles inserted through the bottom of the water collecting boxes, a number of push rods correspondingly sleeved on the bottom ends of the number of nozzles, and a servo electric cylinder for raising and lowering the number of push rods; the top end of the nozzle passes through the top surface of the test bench, and the nozzle is placed on the bottom side wall inside the water collecting box with a water injection hole.

[0006] The above-mentioned setting divides the wrapping paper into multiple testing areas by clamping the wrapping paper with a clamping frame. After the test, the wrapping paper is rolled up by the roll rack to replace the old one with the new one, so that multi-point testing can be carried out continuously. By arranging a rotatable right-angled triangular prism-shaped testing edge block and a testing cone embedded on it in the testing box, the three typical stress states of edge pressure, flat surface pressure, and sharp-angle puncture pressure that the wrapping paper may encounter when wrapping articles are simulated. By arranging a water spray part including a water collection box, a nozzle, a push rod and a servo electric cylinder under the test bench, strength testing can be carried out under humid conditions.

[0007] As a further improvement of the present technical solution, a vertical plate is fixedly connected to the rear side of the top surface of the test bench, and a pair of servo motors are installed on the top of the vertical plate. The output shaft ends of the servo motors are set downward, and are coaxially connected with a variable-pitch screw and a pair of fixed-pitch screws in opposite directions from top to bottom. The two clamping frames correspond to the two fixed-pitch screws up and down and are threadedly connected.

[0008] As a further improvement of the present technical solution, the pitch of the lower half of the variable pitch screw gradually increases from top to bottom, and its length is greater than the length of the fixed pitch screw. A support rod is threadedly connected between a pair of the variable pitch screws, and a hanger is fixedly connected to the top surface of the detection box, and the hanger is fixedly connected to the support rod.

[0009] The two settings achieve the technical effects of high integration, automation and convenient operation of the entire clamping, pressing and releasing process by only reversing the motor.

[0010] As a further improvement of the technical solution, the two end side walls of the fixed distance screw rod are not provided with threads, and an elastic element is embedded on the top surface of the lower clamping frame close to the fixed distance screw rod, for rebounding when the two clamping frames are separated.

[0011] This setting completes the linkage control of the clamping action of the clamping frame on the paper and the pressing action of the detection box: the detection box quickly presses down after the clamping frame is in place; and the clamping frame returns to the contact with the fixed distance screw rod through the rebound of the elastic element.

[0012] As a further improvement of the technical solution, the outer end side wall of the center axis of the detection edge block is annularly provided with a plurality of positioning holes, the positioning rod is inserted into the positioning holes, and the center axes of the plurality of positioning holes respectively correspond to the right angle edges, right angle side surfaces and detection cone of the detection edge block.

[0013] This setting completes the quick identification of the rotation angle of the detection edge block, achieving the technical effect that the operator can intuitively, accurately and conveniently select the required detection state.

[0014] As a further improvement of the technical solution, the front end surface of the detection box is inserted into a positioning ring, the upper segment of the positioning rod is slidingly sleeved with the positioning ring, the middle part of the positioning rod is tightly sleeved with a fixing ring, and the upper part of the fixing ring is provided with a spring sleeved with the positioning rod.

[0015] This setting completes the accurate positioning of the rotation angle of the detection edge block, achieving the technical effect that the operator can lock the required detection state.

[0016] As a further improvement of the technical solution, the left and right ends of the supporting rod are fixedly provided with sliding sleeves, the side wall of the sliding sleeve is inserted through a pin, and the inner end of the pin is slidingly inserted into the threaded groove of the variable distance screw rod.

[0017] As a further improvement of the technical solution, a plurality of water passing holes are formed in the top surface of the test table and directly below the plurality of detection areas, the water passing holes are funnel-shaped, the bottom end of each water passing hole is sleeved with a supporting ring in a double ring structure, and the upper end of the spray pipe is sleeved with the inner ring of the supporting ring.

[0018] As a further improvement of the technical solution, a clamping pad is bonded to the top surface of the clamping frame, vertical clamping sliding grooves are symmetrically formed in the lower part of the front side wall of the vertical plate, a guide rod is inserted between the upper and lower surfaces of the clamping sliding groove, a threaded ring is extended at the rear corner of the clamping frame and is threadedly connected with the fixed distance screw rod, the extended segment is slidingly connected with the clamping sliding groove, an insertion hole is formed in the top surface of the extended segment and is inserted with the guide rod, and the guide rod is sleeved with the elastic element.

[0019] As a further improvement of the technical solution, a plurality of detection sliding grooves are arranged on the upper part of the front side wall of the vertical plate and are in sliding connection with the hanger, a through hole is arranged on the top surface of the vertical section of the hanger, and a plurality of hangers are suspended on the top surface of the vertical plate and are in sliding insertion connection with the through hole.

[0020] The two settings utilize the structures of clamping sliding grooves, guide rods, hangers and the like to ensure the lifting stability of the clamping frame and the detection box.

[0021] Compared with the prior art, the packaging paper strength detection device based on mechanical sensing has the following beneficial effects: 1. The packaging paper strength detection device based on mechanical sensing is provided with a rotatable right triangular prism-shaped detection prism and a detection cone embedded on the detection prism, and the state of the detection prism is switched by rotating the adjusting handle to form edge pressure, flat pressure and sharp pressure, so that the three typical stress states of edge pressure, flat pressure and sharp puncture pressure that the packaging paper may encounter when wrapping articles are simulated, and the stress condition of the paper is recorded and analyzed by using a film pressure sensor, so that the strength of the packaging paper under different stress scenarios can be more comprehensively and truly evaluated.

[0022] 2. The packaging paper strength detection device based on mechanical sensing is driven by a single servo motor coaxially to drive a variable pitch screw rod and a pair of opposite fixed pitch screw rods, and the two fixed pitch screw rods are threadedly connected to the upper and lower clamping frames, and the variable pitch screw rod is threadedly connected to the supporting rod to suspend a plurality of detection boxes, so that the clamping, loosening and pressing actions of the clamping frames and the detection boxes are linked and controlled, and the integrated, automatic and convenient operation of the paper clamping, pressing and releasing processes in the entire detection can be realized by only reversing the single motor.

[0023] 3. The packaging paper strength detection device based on mechanical sensing is provided with a material winding frame at both ends of the test table to wind the packaging paper, and a pair of clamping frames are driven by a servo motor to control the up and down action of the flexible clamping and flat paper, so as to separate a plurality of detection zones and complete the automatic positioning and zoning of the paper in the whole roll state, so as to continuously test multiple points without repeated cutting and manual feeding, thereby greatly improving the detection efficiency and automation degree and saving the operation time.

[0024] 4. The packaging paper strength detection device based on mechanical sensing is provided with a water spraying part under the test table, and a push rod is driven by a servo cylinder to control the water supply and spraying of the spray pipe, so as to complete the action of quantitatively spraying water to the paper in the specified detection zone, thereby effectively simulating the wet state of the packaging paper in a humid environment, and the strength detection under the wet condition can be carried out, so as to more comprehensively evaluate the actual use performance of the packaging paper. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings described herein are for the purpose of illustrating the present application and are not intended to limit the scope of the present application in any way. Further, the shapes and relative sizes of the various components depicted in the drawings are intended to be illustrative only and are not necessarily drawn to scale. Those skilled in the art will recognize that the various components depicted in the drawings can be substituted with other shapes and relative sizes and that the present application is not limited to the shapes and relative sizes of the various components depicted in the drawings.

[0026] Figure 1 Fig. 1 is a schematic diagram of the overall assembly structure of the present application; Figure 2 Fig. 2 is a schematic diagram of the test bench structure of the present application; Figure 3 Fig. 3 is a schematic diagram of the assembly structure of a pair of clamping racks of the present application; Figure 4 Fig. 4 is a schematic diagram of the assembly structure of the detection portion of the present application; Figure 5 Fig. 5 is a schematic diagram of the assembly structure of the detection portion of the present application; Figure 6 Fig. 6 is a schematic diagram of the detection state of the detection prism of the present application; Figure 7 Fig. 7 is a schematic diagram of the detection state of the detection prism of the present application; Figure 8 Fig. 8 is a schematic diagram of the detection state of the detection prism of the present application; Figure 9 Fig. 9 is a schematic diagram of the assembly structure of the water spraying portion of the present application; Figure 10 Fig. 10 is a schematic diagram of the assembly structure of the spray pipe and water collecting box of the present application; Figure 11 Fig. 11 is a schematic diagram of the assembly and disassembly of the spray pipe and push rod of the present application; The meanings of the various reference numerals in the drawings are as follows: 100, test bench; 101, water passage hole; 110, roll rack; 120, clamping rack; 121, elastic member; 122, insertion hole; 123, clamping pad; 130, servo motor; 131, variable pitch screw; 132, fixed pitch screw; 140, vertical plate; 141, clamping sliding groove; 142, guide rod; 143, detection sliding groove; 144, hanger rod; 200, detection portion; 210, detection box; 211, avoidance opening; 212, hanger; 213, through hole; 220, detection prism; 221, detection cone; 222, positioning hole; 230, adjusting handle; 240, positioning rod; 241, positioning ring; 242, fixing ring; 243, spring; 250, supporting rod; 251, sliding sleeve; 300, water spraying portion; 310, spray pipe; 311, water injection hole; 312, supporting ring; 320, water collecting box; 330, push rod; 340, servo cylinder; 341, push rack. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application described herein are intended to be illustrative only and are not intended to be limiting in any way. Suitable modifications and adaptations of the application will be apparent to those skilled in the art in view of the foregoing descriptions and accompanying drawings. As noted above, the terms "coupled" and "connected", along with their derivatives, can be used. These terms are not intended as synonyms for each other. Rather, in particular embodiments, "connected" can be used to indicate that two or more elements are in direct physical or logical contact with each other. "Coupled" can be used to indicate that two or more elements are in either direct or indirect (with other intervening

[0028] The terms "center", "vertical", "horizontal", "front", "back", "up", "down", "left", "right", "top", "bottom", "inner", "outer" and the like as used herein refer to the orientation or position of the device or element shown in the drawings, and are for convenience only in describing the present application and its various embodiments, and are not intended to limit or in any way impede upon the scope of the present application. In addition, in the description of the present application, the term "several" means two or more, unless specifically and explicitly limited otherwise.

[0029] Please refer to Figures 1-8 As shown in the drawings, the present application provides a kind of packaging paper strength detection device based on mechanics sensing, including test table 100 and the top of its left and right ends of a pair of roll material frame 110, for winding packaging paper flat, a pair of clamping frame 120 is slidably connected to the top of test table 100, for up and down clamping flat packaging paper, and is separated into several detection zones, the top of each detection zone is suspended with detection part 200, so that the paper surface of detection zone is as test object, guarantee the overall connection state of flat paper, facilitate winding test, without repeatedly feeding, save time and convenient operation.

[0030] Specifically, detection part 200 includes detection box 210 in hollow cuboid, detection edge block 220 rotationally connected to the front and rear inner walls of detection box 210, adjusting handle 230 coaxially connected with the outer end of the center axis of detection edge block 220, and positioning rod 240 positioned and inserted with the side wall of the outer end of the center axis of detection edge block 220;The detection state is switched by hiding detection edge block 220 in detection box 210, the detection state is switched by rotating detection edge block 220 driven by adjusting handle 230, and the detection state of detection edge block 220 is positioned by positioning rod 240;The contact area between the center axis of detection edge block 220 and detection box 210 is embedded with a film pressure sensor, when detection box 210 is lowered to the paper to be detected and pressure detection is performed, the pressure is received by the film pressure sensor, and the pressure signal is transmitted to the detection terminal for recording and analysis, which is prior art and will not be described here.

[0031] Further, the detection edge block 220 is a right triangular prism structure, forming an edge pressure state, which simulates the pressure state of wrapping books, boxes and other objects with edges on paper; the detection cone 221 is embedded in the middle of the corresponding inclined surface of the right angle edge of the detection edge block 220, the detection cone 221 has three faces and each face has a right angle, forming a sharp pressure state, which simulates the pressure state of wrapping books, boxes and other objects with edges on paper; the bottom surface of the detection box 210 is provided with an avoiding port 211, the side edge of the right angle edge of the detection edge block 220 is rotationally and adaptively connected with the avoiding port 211, forming a flat pressure state, which simulates the pressure state of wrapping books, boxes and other objects with flat surfaces on paper; thereby quickly analyzing the strength of various pressure states of paper.

[0032] Further, the top surface of the test bench 100 is fixedly connected with a vertical plate 140, and the top surface of the clamping frame 120 is bonded with a clamping pad 123 made of silica gel or rubber, so as to flexibly clamp the paper, avoid the paper being torn at the clamping position and damage the paper connection, and ensure that the paper can be rolled after detection and new detection area is replaced; a pair of servo motors 130 are installed on the top of the vertical plate 140, the output shaft end of the servo motor 130 is downwardly arranged, and a variable pitch screw 131 and a pair of reverse fixed pitch screws 132 are coaxially connected from top to bottom, the two clamping frames 120 are threadedly connected with the two fixed pitch screws 132 in upper and lower correspondence, so that the servo motor 130 drives the two clamping frames 120 to move close to or separate from the paper.

[0033] In addition, in order to ensure the stable lifting of the clamping frame 120, the front side wall of the vertical plate 140 is symmetrically provided with a vertical clamping sliding groove 141 at the lower part, a guide rod 142 is inserted between the upper and lower surfaces of the clamping sliding groove 141, a threaded ring is extended at the rear corner of the clamping frame 120 and is threadedly connected with the fixed pitch screw 132, the extension is slidably connected with the clamping sliding groove 141, and a plug hole 122 is formed in the top surface of the extension and is plugged with the guide rod 142, so that the clamping frame 120 is guided to move up and down.

[0034] Two fixed lead screws 132 are connected to the end side wall without threads, that is, the threaded ring of the clamping frame 120 is not driven by the fixed lead screw 132 when it moves to the connection end, so that the servo motor 130 continues to work to drive the variable lead screw 131 to drive the detection box 210 to press the paper clamped by a pair of clamping frames 120; wherein the top surface of the lower clamping frame 120 is embedded with an elastic element 121, the guide rod 142 is sleeved with the elastic element 121, and the elastic element 121 is a spring or a silicone ring pad or a butterfly-shaped elastic piece, which is used to rebound a pair of clamping frames 120 when they are separated from the threaded connection of the fixed lead screw 132, that is, when the servo motor 130 is reversely driven, the elastic element 121 releases the elastic force to assist the threaded ring of the upper and lower clamping frames 120 to be connected with the threaded connection of the fixed lead screw 132 and to be far away from each other. This design is simple, ingenious and practical, and only one servo motor 130 is needed to complete the clamping and release of the paper by the two clamping frames 120 and to control the detection box 210 to contact and press the paper for strength detection.

[0035] Specifically, the lower half of the variable lead screw 131 gradually increases from top to bottom, and the length is greater than the length of the fixed lead screw 132, so that the detection box 210 starts to descend synchronously with the clamping frame 120, and after the two clamping frames 120 clamp the paper, the detection box 210 can quickly descend to form a state of pressing the paper; a pair of variable lead screws 131 are threadedly connected with a supporting rod 250, the top surface of the detection box 210 is fixedly connected with a hanging bracket 212, and the hanging bracket 212 is fixedly connected with the supporting rod 250; the left and right ends of the supporting rod 250 are fixedly provided with sliding sleeves 251, the side wall of the sliding sleeve 251 is inserted with a pin, and the inner end of the pin is slidably inserted with the threaded groove of the variable lead screw 131, so that the sliding sleeve 251 smoothly slides up and down outside the variable lead screw 131.

[0036] Further, a plurality of detection sliding grooves 143 are formed in the front side wall of the vertical plate 140 and are slidably connected with the hanging bracket 212, a through hole 213 is formed in the vertical section of the hanging bracket 212, a plurality of hanging rods 144 are suspended on the top surface of the vertical plate 140, the hanging rod 144 is slidably inserted with the through hole 213, and the hanging rod 144 plays a role in directional lifting of the detection box 210.

[0037] Further, the outer end side wall of the center axis of the detection prism 220 is annularly provided with a plurality of positioning holes 222, the positioning rod 240 is inserted into the positioning hole 222, and the positioning hole 222 plays a role in positioning the rotation angle of the detection prism 220; the center axis of the plurality of positioning holes 222 is respectively directed to the right-angle edge, the right-angle side, and the detection cone 221 of the detection prism 220, and the outer end face of the adjusting handle 230 is correspondingly provided with a groove with the same direction as the plurality of positioning holes 222, and the plurality of grooves are triangular, linear, and right-angled, so that the operator can quickly identify the corresponding pressure state formed by rotating the detection prism 220, for example, when the top of the adjusting handle 230 is a right-angled groove, the right-angle edge of the detection prism 220 is downward, and the prism pressure state is formed; when the top of the adjusting handle 230 is a linear groove, the right-angle side of the detection prism 220 is downward, and the flat pressure state is formed; when the top of the adjusting handle 230 is a triangular groove, the detection cone 221 is downward, and the sharp pressure state is formed.

[0038] Further, in order to quickly position the angle of the detection prism 220, the front end face of the detection box 210 is inserted with a positioning ring 241, the upper segment of the positioning rod 240 is slidingly sleeved with the positioning ring 241, the middle part of the positioning rod 240 is tightly sleeved with a fixing ring 242, and the upper part of the fixing ring 242 is provided with a spring 243 sleeved with the positioning rod 240; that is, the spring 243 always exerts pressure on the fixing ring 242 and the positioning rod 240 to be inserted into the positioning hole 222, and the positioning rod 240 can be withdrawn from the positioning hole 222 by lifting it.

[0039] As shown in Figures 9-11 In order to test the strength of the packaging paper after being wet, simulate the carrying capacity of the packaging paper after being wet in the real environment, a water spraying part 300 is arranged below the test table 100, the water spraying part 300 includes a plurality of water collecting boxes 320 arranged below the plurality of detection areas, a plurality of spray pipes 310 inserted through the bottom of the water collecting box 320, a plurality of push rods 330 correspondingly sleeved with the bottom end of the plurality of spray pipes 310, and a servo cylinder 340 for lifting the plurality of push rods 330; the servo cylinder 340 is a pair and is fixedly connected between the two, and the plurality of push rods 330 are vertically sleeved on the top surface of the push frame 341; the top end of the spray pipe 310 penetrates to the top surface of the test table 100, and the bottom side wall inside the water collecting box 320 is provided with a water injection hole 311.

[0040] The water in the water collecting box 320 enters the spray pipe 310 for replenishment by driving the plurality of push rods 330 to be lowered below the water injection hole 311 by the servo cylinder 340, and the water in the spray pipe 310 is squeezed out to wet the paper by driving the plurality of push rods 330 to rise by the servo cylinder 340, simulating the wet state of the paper in the humid environment, and then the detection part 200 is used for detection.

[0041] Further, the top surface of the test bench 100 is provided with a plurality of water through holes 101 below the plurality of detection areas, the water through holes 101 are funnel-shaped, and the bottom end of the water through holes 101 is sleeved with a double-ring supporting ring 312, the upper end of the spray pipe 310 is sleeved with the inner ring of the supporting ring 312, the water through holes 101 are used for collecting the falling water and returning the water to the water collecting box 320, and the supporting ring 312 is used for positioning the spray pipe 310 to stabilize the water supply.

[0042] The packaging paper strength detection device based on mechanics sensing of the application is used, the packaging paper is first spread between the two roll holders 110, then the test state of the plurality of detection parts 200 is controlled by adjusting the plurality of adjusting handles 230, the right-angle edges of the detection edge blocks 220 are downward, the edge pressing state is formed, the right-angle sides of the detection edge blocks 220 are downward, the flat pressing state is formed, the detection cones 221 are downward, the sharp pressing state is formed, the servo motor 130 is started to drive the two clamping frames 120 to be close to each other to clamp the paper, a plurality of detection areas are formed, the plurality of detection boxes 210 are driven to press the paper surface of the detection area until the paper is broken, the pressure is received by the film pressure sensor, and the pressure signal is transmitted to the detection terminal to be recorded and analyzed.

[0043] It should be noted that the fixed connection and the fixed setting of the application are realized by using conventional fixing means such as bolt connection or welding. The above-mentioned embodiments are only for describing the technical concept and characteristics of the application, the purpose is to enable the person skilled in the art to understand the content of the application and implement it, and cannot limit the protection scope of the application. Any equivalent changes or modifications made according to the spirit and essence of the application should be covered within the protection scope of the application.

Claims

1. A wrapping paper strength testing device based on mechanical sensing, comprising a test bench and a pair of roll holders mounted on the left and right ends of its top surface for rolling and flattening the wrapping paper, characterized by: A pair of clamping frames are slidably connected above the test bench for clamping the flattened wrapping paper up and down, and are divided into several testing areas. A testing unit is suspended directly above each testing area, and the testing unit includes a hollow rectangular testing box, a testing edge block rotatably connected to the front and rear inner walls of the testing box, an adjustment handle coaxially connected to the outer end of the central axis of the testing edge block, and a positioning rod positioned and plugged into the side wall of the outer end of the central axis of the testing edge block; a thin film pressure sensor is embedded in the contact area between the central axis of the testing edge block and the testing box; The detection edge block is a right-angled triangular prism structure, forming an edge pressure state; a detection cone is embedded in the middle of the inclined surface corresponding to the right-angled edge of the detection edge block, and the detection cone has three faces, and the top angle of each face is a right angle, forming a sharp pressure state; the bottom surface of the detection box is provided with an avoidance opening, and the side edge of the right-angled edge of the detection edge block is rotatably adapted to be engaged with the avoidance opening, forming a flat pressure state; A water spray part is provided under the test bench, and the water spray part includes a number of water collecting boxes correspondingly arranged directly below the number of detection areas, a number of nozzles inserted through the bottom of the water collecting boxes, a number of push rods correspondingly sleeved on the bottom ends of the number of nozzles, and a servo electric cylinder for raising and lowering the number of push rods; the top end of the nozzle passes through the top surface of the test bench, and the nozzle is placed on the bottom side wall inside the water collecting box with a water injection hole.

2. The packaging paper strength detection device based on mechanical sensing according to claim 1, characterized in that: A vertical plate is fixedly connected to the rear side of the top surface of the test bench, and a pair of servo motors are installed on the top of the vertical plate. The output shaft end of the servo motor is set downward, and is coaxially connected with a variable-pitch screw and a pair of fixed-pitch screws in opposite directions from top to bottom. The two clamping frames correspond to the two fixed-pitch screws up and down and are threadedly connected.

3. The packaging paper strength detection device based on mechanical sensing according to claim 2, characterized in that: The pitch of the lower half of the variable pitch screw gradually increases from top to bottom, and its length is greater than that of the fixed pitch screw. A support rod is threadedly connected between a pair of the variable pitch screws, and a hanger is fixedly connected to the top surface of the detection box, and the hanger is fixedly connected to the support rod.

4. The packaging paper strength detection device based on mechanical sensing according to claim 3, characterized in that: The side walls of the connecting ends of the two fixed-distance screw rods are not provided with threads, and the clamping frame located below is embedded with an elastic member near the top surface of the fixed-distance screw rod, which is used to rebound and connect with the fixed-distance screw rod threadedly when a pair of clamping frames are separated.

5. The packaging paper strength detection device based on mechanical sensing according to claim 4, characterized in that: The outer end side wall of the central axis of the detection edge block is annularly provided with a plurality of positioning holes, and the positioning rods are plugged into the positioning holes. The directions of the central axes of the plurality of positioning holes correspond to the right-angled edges, right-angled sides, and detection cone of the detection edge block respectively.

6. The packaging paper strength detection device based on mechanical sensing according to claim 5, characterized in that: A positioning ring is inserted into the front end of the detection box, the upper section of the positioning rod is slidably sleeved with the positioning ring, the middle of the positioning rod is tightly sleeved with a fixing ring, and a spring sleeved with the positioning rod is provided above the fixing ring.

7. The packaging paper strength detection device based on mechanical sensing according to claim 6, characterized in that: Sliding sleeves are fixedly provided at the left and right ends of the supporting rod, and a pin is inserted through the side wall of the sliding sleeve, and the inner end of the pin is slidably inserted into the thread groove of the variable pitch screw rod.

8. The packaging paper strength detection device based on mechanical sensing according to claim 7, characterized in that: A plurality of water holes are provided on the top surface of the test bench and directly below the plurality of detection areas. The water holes are funnel-shaped and a supporting ring with a double-ring structure is sleeved inside the bottom end thereof. The upper end of the nozzle is sleeved with the inner ring of the supporting ring.

9. The packaging paper strength detection device based on mechanical sensing according to claim 8, characterized in that: A clamping pad is bonded to the top surface of the clamping frame, and a vertical clamping groove is symmetrically provided on the lower part of the front side wall of the vertical plate. A guide rod is inserted between the upper and lower surfaces of the clamping groove. A threaded ring is extended at the rear corner of the clamping frame and is threadedly connected to the fixed-distance screw rod, and this extension section is engaged and slidably connected to the clamping groove, and a socket is provided on the top surface of this extension section to be inserted into the guide rod, and the guide rod is sleeved with the elastic member.

10. The packaging paper strength detection device based on mechanical sensing according to claim 9, characterized in that: The upper part of the front side wall of the vertical plate is provided with a plurality of detection sliding grooves which are slidably connected to the hanger. The top surface of the vertical section of the hanger is provided with a through hole. The top surface of the vertical plate is suspended with a plurality of suspension rods, and the suspension rods are slidably plugged into the corresponding through holes.

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