Load-bearing performance testing device and application in production of flexible intermediate bulk container

Abstract

The application discloses a load-bearing performance testing device and application in flexible container production, and relates to the technical field of packaging material detection. The load-bearing performance testing device comprises a bearing frame, a hydraulic cylinder and a lifting assembly. The lifting assembly comprises a hollow seat, a supporting plate and a lifting part. The telescopic end of the hydraulic cylinder penetrates through the hollow seat and is provided with a pressing plate. A first pressure sensor is arranged in the oil circuit of the hydraulic cylinder. The application solves the problems of uneven density distribution, blind area and slope accumulation of materials when the materials are continuously conveyed into the flexible container by intermittently and repeatedly impacting the outer side of the flexible container by the push plate. The conditions are consistent when the load-bearing performance of multiple flexible containers is tested, and the test result is more accurate. Through the control of the extension length of the first pushing part and the second pushing part, the center of gravity of the flexible container can be adjusted in time according to the input amount of the materials in the flexible container during the feeding process, so that the materials in the flexible container are uniformly distributed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging material detection, in particular to a load-bearing performance testing device and its application in the production of bulk bags. BACKGROUND

[0002] Bulk bags have good sealing performance and high impact strength, and are widely used in food, medicine, energy materials, fine chemicals and other fields. Currently, PP / PE is used as the main raw material to modify the bulk bags by blending in proportion, so that the produced bulk bags can meet the application needs of multiple fields. However, in the modification stage of the bulk bag material, in order to test whether the developed bulk bag material meets the needs of field use, the load-bearing performance of the produced bulk bag needs to be detected and verified.

[0003] A woven bag load-bearing testing device with the application number CN202110786376.X is disclosed, which comprises a base, a storage frame, a lower ring plate, an upper ring plate and an electric push rod. The storage frame is fixed on the upper surface of the left side of the base. A control cabinet is fixed on the upper front end of the right side of the base. The lower ring plate is horizontally arranged above the base on the left side of the control cabinet. The lower ring plate is parallel to the base, and a support rod is supported on the outer circle below the lower ring plate. A support cylinder is sleeved on the outer circle below the support rod.

[0004] A stretch testing device for an environmentally friendly bulk bag with the application number CN202411274001.5 is disclosed, which comprises an operating table. A support plate is arranged on the upper end of the operating table. A driving piece is arranged on the upper end of the support plate. A telescopic piece is symmetrically arranged on one side of the support plate. A sliding rod is arranged between the two telescopic pieces. A sliding block is slidably mounted on the outer surface of the sliding rod. A stretching assembly is arranged on the lower end of the sliding block. The stretching assembly is used to stretch the bulk bag.

[0005] The load-bearing and stretching performance testing device for bulk bags described above needs to be manually filled with bulk bags before formal testing. Since the capacity of the bulk bag is large, it is time-consuming and laborious to carry the filled bulk bag. In particular, when the bulk bag is filled with materials, it is difficult to ensure the uniformity of the material distribution, which may cause the bulk bag to tilt due to unstable center of gravity during lifting. In addition, when the pressure plate presses the material and the bulk bag downward, the material and the bulk bag are unevenly stressed.

[0006] In addition, during the load-bearing performance testing of the bulk bag, the local area of the bulk bag may be deformed and expanded, causing the local area of the bulk bag to bulge. In the subsequent process of pressing the pressure plate downward, the unevenness of the pressure distribution is further aggravated, increasing the risk of damage to the bulk bag.

[0007] Therefore, a load-bearing performance testing device and its application in the production of bulk bags are proposed to solve the above problems. SUMMARY

[0008] The purpose of the present application is to disclose a load-bearing performance testing device and its application in the production of flexible freight containers to solve the problems raised in the background art.

[0009] To achieve the above purpose, the present application is implemented by the following technical solutions: a load-bearing performance testing device, comprising a bearing frame, a hydraulic cylinder and a lifting assembly, the lifting assembly comprising a hollow seat, a supporting plate and a lifting part, the telescopic end of the hydraulic cylinder penetrating the hollow seat and being provided with a pressing plate;

[0010] A first pressure sensor is arranged in the oil circuit of the hydraulic cylinder, an electromagnetic bolt is arranged in the interior of the hollow seat, a sliding groove is formed in the inner side of the supporting leg of the bearing frame, and an electromagnetic lock is arranged at the end of the side close to the bearing frame (1) of the supporting plate;

[0011] A driving mechanism is arranged at the bottom of the bearing frame, the driving mechanism comprising a driving box, a gear and a motor, two groups of moving grooves are formed in the driving box, each group of moving grooves comprises two parallel moving grooves, the two groups of moving grooves are perpendicular to each other and penetrate the driving box, a rack plate is arranged in the moving groove and is in mesh with the gear, a support rod is arranged at the end of the rack plate away from the driving box, an opening is formed in the bottom of the bearing frame, the end of the support rod away from the driving box penetrates the opening and is connected with a push plate, and an elastic cover is arranged between adjacent two push plates.

[0012] Optionally, a pushing assembly is arranged between the support rod and the push plate, the pushing assembly comprising a first pushing part and a second pushing part, the first pushing part and the second pushing part are the same in structure and are vertically arranged in correspondence, the first pushing part is fixedly connected with the second pushing part through a connecting plate, the first pushing part is below the second pushing part, the first pushing part comprises a cylinder, a disc is arranged at the telescopic end of the cylinder, a connecting seat is connected with the end of the disc away from the cylinder through a spring, a hinge shaft is arranged at the end of the connecting seat away from the spring, a support seat is arranged on the outer side of the push plate, the support seat is movably hinged with the hinge shaft, the support seat comprises two support seats vertically corresponding, a sliding groove is formed in the corresponding position of the push plate and the support seat below, and the sliding groove is movably connected with the support seat below.

[0013] Optionally, the telescopic end of the hydraulic cylinder is detachably connected with the pressing plate, the shape of the pressing plate is adapted to the shape of the flexible freight container, the oil pressure in the oil circuit is detected by using the first pressure sensor, the force applied by the pressing plate to the flexible freight container is calculated, and when the pressing plate is driven downward by the hydraulic cylinder, the resistance of the hard lump-shaped object on the inner wall of the push plate to the pressing plate is detected to determine whether the hard lump-shaped object exists on the inner wall of the push plate.

[0014] Optionally, the supporting plate is arranged outside the hollow seat, four supporting plates are arranged, the four supporting plates correspond to the four supporting legs of the bearing frame respectively, and the electromagnetic lock is arranged at one end of the supporting plate away from the hollow seat.

[0015] Optionally, the hydraulic cylinder is located at the middle part of the bearing frame, the hollow seat is locked and fixed with the telescopic end of the hydraulic cylinder through the electromagnetic bolt, the supporting plate is locked and fixed with the sliding groove through the electromagnetic lock, and the fixed end of the hydraulic cylinder is provided with a flange plate.

[0016] Optionally, the gear is rotatably connected at the middle part of the driving box, the motor is fixedly installed at the bottom of the driving box, the rotating shaft of the motor penetrates through the bottom of the driving box and is fixedly connected with the middle part of the gear, one group of the moving grooves penetrates through the driving box left and right, another group of the moving grooves penetrates through the driving box front and back, and the moving grooves are correspondingly matched with the gear.

[0017] Optionally, the middle part of the supporting plate is provided with a sliding groove, the inside of the sliding groove is provided with a transmission mechanism, the transmission mechanism is a lead screw transmission mechanism, and the moving end of the transmission mechanism is fixedly connected with the lifting part.

[0018] Optionally, the lifting part comprises a lifting seat, the lifting seat is in an inverted U-shaped structure, the inside of the lifting seat is provided with an electric lifter, the telescopic end of the electric lifter is provided with a supporting column, one side of the lifting seat is provided with a notch, the notch is correspondingly matched with the supporting column, the inside of the notch is provided with an electromagnetic bolt, the notch is locked and fixed with the supporting column through the electromagnetic bolt, the top of the lifting seat is provided with a supporting section, the top end of the supporting section penetrates through the sliding groove, the supporting section is fixedly connected with the moving end of the transmission mechanism in the sliding groove, and the top of the supporting column is provided with a curved groove.

[0019] The application also provides an application of the load-bearing performance testing device in the production of the flexible container bag.

[0020] The technical effects and advantages of the application are as follows:

[0021] 1. The application repeatedly impacts the outside of the flexible container bag intermittently through the push plate, disturbs the material inside the flexible container bag, solves the problems of uneven density distribution, blind area and slope accumulation when the material is continuously conveyed into the flexible container bag, ensures the reliability of material conveying, makes the conditions consistent when multiple flexible container bags are subjected to load-bearing performance testing, and makes the test results more accurate.

[0022] 2、The application realizes the timely adjustment of the center of gravity of the bag by controlling the extension length of the first and second pushing parts, and the uniform distribution of the material in the bag, so that the material in each layer of the bag is regularly distributed, the center of gravity is close to the middle of the bag, and the stability of the bag during lifting is improved.

[0023] 3、The application turns the bottom end of the four pushing plates inward, so that the bottom end of the four pushing plates is butted and forms a whole bucket structure, the stability of the material support is improved, the situation that the material is scattered everywhere due to the rupture of the bag is prevented, and the material is kept concentrated during the test, so as to facilitate the subsequent cleaning or processing. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the overall structure of the application;

[0025] Figure 2 It is a schematic view of the lifting assembly structure of the application;

[0026] Figure 3 It is a schematic view of the driving mechanism of the application;

[0027] Figure 4 It is a schematic view of the driving mechanism of the application; Figure 3

[0028] Figure 5 It is a schematic view of the pushing assembly structure of the application;

[0029] Figure 6 It is a schematic view of another angle structure of the pushing assembly of the application;

[0030] Figure 7 It is a schematic view of another angle structure of the pushing assembly of the application; Figure 6

[0031] Figure 8 It is a schematic view of the lifting structure of the application.

[0032] ​​In the figure: 1, bearing frame; 101, mounting plate; 102, feed pipe; 103, chute; 104, driving mechanism; 1041, driving box; 1042, gear; 1043, motor; 1044, moving groove; 1045, rack plate; 1046, opening; 2, hydraulic cylinder; 201, flange; 202, pressing plate; 3, lifting assembly; 301, hollow seat; 302, supporting plate; 3021, slide; 303, lifting part; 3031, lifting seat; 3032, electric lifter; 3033, support column; 3034, notch; 3035, support section; 304, electromagnetic lock; 4, pushing assembly; 401, support rod; 402, air cylinder; 403, connecting plate; 405, disc; 406, spring; 407, connecting seat; 408, insertion rod; 409, hinged shaft; 410, push plate; 411, support seat; 412, sliding groove; 413, elastic cover. DETAILED DESCRIPTION

[0033] In order to enable one skilled in the art to better understand the above-mentioned objects, features and advantages of the present application, the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced without these details, which are different from the description, therefore, the scope of protection of the present application is not limited by the specific embodiments disclosed below.

[0035] Embodiment one

[0036] Please refer to Figures 1 to 8 The embodiment discloses a bearing performance test device, which comprises a bearing frame 1, a hydraulic cylinder 2 and a lifting assembly 3. The hydraulic cylinder 2 is located in the middle of the bearing frame 1. The fixed end of the hydraulic cylinder 2 is provided with a flange 201. The hydraulic cylinder 2 is fixedly connected with the ceiling through the flange 201. The lifting assembly 3 comprises a hollow seat 301, a supporting plate 302 and a lifting part 303. The hollow seat 301 is locked and fixed with the telescopic end of the hydraulic cylinder 2 through an electromagnetic bolt. The supporting plate 302 is arranged outside the hollow seat 301. Four supporting plates 302 are arranged. The four supporting plates 302 are respectively corresponding to the four supporting legs of the bearing frame 1. The telescopic end of the hydraulic cylinder 2 penetrates through the hollow seat 301 and is provided with a pressing plate 202. The lifting part 303 supports and lifts the bag. The hydraulic cylinder 2 drives the pressing plate 202 to extrude the bag and the materials in the bag.

[0037] A mounting plate 101 is arranged on one side of the top of the bearing frame 1. A feed pipe 102 is arranged on the mounting plate 101. The end of the feed pipe 102 away from the bearing frame 1 is provided with a conveying unit for conveying materials.

[0038] The first pressure sensor is arranged in the oil circuit of the hydraulic cylinder 2, the oil pressure in the oil circuit is detected by the first pressure sensor, the force applied by the pressing plate 202 to the bag is calculated, the hollow seat 301 is internally provided with an electromagnetic bolt, the inside of the supporting leg of the carrier 1 is provided with a sliding groove 103, the end of the supporting plate 302 is provided with an electromagnetic lock 304, the electromagnetic lock 304 is arranged at the end of the supporting plate 302 away from the hollow seat 301, the electromagnetic lock 304 is in sliding connection with the sliding groove 103, and the supporting plate 302 is locked and fixed by the electromagnetic lock 304 and the sliding groove 103.

[0039] The middle part of the supporting plate 302 is provided with a sliding groove 3021, and the inside of the sliding groove 3021 is provided with a transmission mechanism.

[0040] As an embodiment of the lifting part 303, the lifting part 303 comprises a lifting seat 3031, the lifting seat 3031 is in inverted U-shaped structure, the inside of the lifting seat 3031 is provided with an electric lifter 3032, the telescopic end of the electric lifter 3032 is provided with a supporting column 3033, one side of the lifting seat 3031 is provided with a notch 3034, the notch 3034 is correspondingly matched with the supporting column 3033, the inside of the notch 3034 is provided with an electromagnetic bolt, the notch 3034 is locked and fixed with the supporting column 3033 through the electromagnetic bolt, the top of the lifting seat 3031 is provided with a supporting section 3035, the top end of the supporting section 3035 penetrates through the sliding groove 3021, the supporting section 3035 is fixedly connected with the moving end of the transmission mechanism in the sliding groove 3021, the top of the supporting column 3033 is provided with a curved groove, and the friction between the curved groove and the bag lifting ring is reduced.

[0041] The bottom of the bearing frame 1 is provided with a driving mechanism 104. As an embodiment of the driving mechanism 104, the driving mechanism 104 comprises a driving box 1041, a gear 1042 and a motor 1043. The gear 1042 is rotationally connected to the middle part of the driving box 1041. The motor 1043 is fixedly installed at the bottom of the driving box 1041. The rotating shaft of the motor 1043 penetrates through the bottom of the driving box 1041 and is fixedly connected to the middle part of the gear 1042. Two groups of moving grooves 1044 are formed in the driving box 1041. The two groups of moving grooves 1044 are staggered vertically. Each group of moving grooves 1044 comprises two parallel moving grooves 1044. The two groups of moving grooves 1044 are perpendicular to each other and penetrate through the driving box 1041. One group of moving grooves 1044 penetrates through the driving box 1041 horizontally. The other group of moving grooves 1044 penetrates through the driving box 1041 vertically. The moving grooves 1044 are correspondingly matched with the gear 1042. The moving grooves 1044 are provided with a rack plate 1045 which is meshed with the gear 1042. The rack plate 1045 is provided with a support rod 401 at the end away from the driving box 1041. The bottom of the bearing frame 1 is provided with an opening 1046. The end of the support rod 401 away from the driving box 1041 penetrates through the opening 1046 and is connected with a push plate 410. The adjacent two push plates 410 are provided with an elastic cover 413.

[0042] The shape of the pressing plate 202 is matched with the shape of the bag. The shape of the pressing plate 202 is matched with the shape formed by the four push plates 410. For different specifications of the bag, the rack plate 1045 and the push plate 410 are horizontally moved by the motor 1043. The specifications of the bag matched by the four push plates 410 are adjusted. The pressing plate 202 is detachably connected with the telescopic end of the hydraulic cylinder 2. Different specifications of the pressing plate 202 are replaced according to different specifications of the bag. The pressing plate 202 matched with the specifications of the bag is used to avoid the situation that the material in the bag moves upward from the gap between the pressing plate 202 and the bag when the pressing plate 202 presses the material in the bag, which causes the material and the bag to be unevenly pressed when the pressing plate 202 presses the material downward.

[0043] When the material is transported into the bag, the lifting assembly 3 is located above the pressing plate 202, at this time the electromagnetic lock 304 is energized to retract, releasing the lock between the chute 103, and the electromagnetic bolt inside the hollow seat 301 is locked and fixed with the telescopic end of the hydraulic cylinder 2, through the telescopic end of the hydraulic cylinder 2 extending downward, driving the hollow seat 301, the supporting plate 302, and the lifting part 303 to move stably downward, through the screw transmission mechanism in the slide 3021, adjust the horizontal position of the lifting part 303, make the support column 3033 of the lifting part 303 correspond to the lifting ring of the bag, at this time the electromagnetic bolt in the gap 3034 releases the lock of the support column 3033, the support column 3033 is driven by the electric lifter 3032 to extend downward, make the support column 3033 from the gap 3034 downward, then the staff hangs the lifting ring of the bag in the curved slot in the middle of the support column 3033, then the electric lifter 3032 drives the support column 3033 to retract and reset, at the same time the electromagnetic bolt in the gap 3034 relocks the support column 3033, make the lifting ring of the bag limited between the lifting seat 3031 and the support column 3033, at this time there is a distance between the bottom surface of the bag and the bottom plate of the bearing frame 1, prevent the bottom of the bag from contacting the bottom plate of the bearing frame 1 when the material is transported into the bag, at this time the staff places the outlet end of the feeding pipe 102 in the inside of the bag, through the conveying unit in the feeding pipe 102 to automatically transport the material into the bag through the feeding pipe 102, in the process of material transportation into the bag, the motor 1043 starts, first the motor 1043 drives the gear 1042 to rotate forward, under the meshing cooperation of the gear 1042 and the rack plate 1045, the support rod 401 and the push plate 410 are driven by the rack plate 1045 to move to the side close to the bag, and the inside of the push plate 410 is tightly attached to the outside of the bag, with the transportation of the material into the bag, the motor 1043 is started intermittently, and within the starting time, the gear 1042 is driven to rotate forward and reverse repeatedly, when the gear 1042 rotates reversely, the rack plate 1045 drives the support rod 401 to move outward along the opening 1046 quickly, making the push plate 410 away from the bag, when the gear 1042 rotates forward, the rack plate 1045 drives the support rod 401 to move inward along the opening 1046 quickly, at the same time, the push plate 410 is driven to move close to the bag quickly, forming an impact on the outside of the bag, using the impact of the push plate 410 contacting the bag to disturb the material in the bag, thereby effectively improving the transfer efficiency of the material accumulated on the side close to the feeding pipe 102 in the bag to other positions in the bag, in the process of the push plate 410 repeatedly impacting the side of the bag intermittently and quickly, with the continuous transportation of the material into the bag, the material is more evenly distributed in the bag, reducing the blind area in the bag, at the same time, avoiding the situation that the material is distributed in the bag in a slope shape with one side high and the other side low during the continuous transportation of the material, preventing the material from overflowing from the high slope side of the bag, at the same time, the material can also be distributed more evenly on the top of the bag.

[0044] In summary, in the process of automatically conveying the material into the bag, the push plate 410 repeatedly impacts the outside of the bag intermittently, which disturbs the material inside the bag, solves the problems of uneven density distribution, blind area and slope accumulation of the material during the continuous conveying of the material into the bag, ensures the reliability of the material conveying, makes the conditions consistent when multiple bags are tested for load-bearing performance, and makes the test results more accurate.

[0045] When the material conveying into the bag is completed, the electromagnetic latch in the hollow seat 301 keeps the lock of the telescopic end of the hydraulic cylinder 2, the electromagnetic lock 304 keeps energized and retracted, and then the hollow seat 301, the supporting plate 302, the lifting part 303 and the bag are moved upward by a distance through the retraction of the telescopic end of the hydraulic cylinder 2, so that there is a certain distance between the bottom of the bag containing the material and the bottom plate of the bearing frame 1, to avoid the contact between the bottom of the bag and the bottom plate of the bearing frame 1 when the telescopic end of the hydraulic cylinder 2 drives the pressure plate 202 to press down, and then the electromagnetic lock 304 is de-energized to fix the position of the hollow seat 301 and the supporting plate 302, and the electromagnetic latch in the hollow seat 301 releases the lock of the telescopic end of the hydraulic cylinder 2, and then the pressure plate 202 is continuously moved downward by the telescopic end of the hydraulic cylinder 2. During the downward movement of the pressure plate 202, the material in the bag is continuously pressed, and the pressure is transmitted to the bag. Because the pressure in the oil circuit of the hydraulic cylinder 2 is proportional to the pressure exerted by the hydraulic cylinder 2 on the material and the bag, during the continuous downward movement of the pressure plate 202 driven by the telescopic end of the hydraulic cylinder 2, the pressure value in the oil circuit is detected by the first pressure sensor, and the pressure of the bag is indirectly obtained. According to the detected pressure data, the load-bearing performance of the bag is determined.

[0046] Example Two

[0047] Please refer to Figures 1 to 8 Although the impact of the push plate 410 can improve the uniformity of the material distribution in the bag to some extent, the impact cannot ensure the stability of the center of gravity of the bag after the material conveying is completed. In actual use, when the bag containing the material is moved upward, if the center of gravity is unstable, the bag will deviate, which increases the instability of the bag during lifting and easily causes the bag to collide with nearby objects, resulting in damage to the bag and spilling of the material. In order to solve this problem, the following example two is proposed to solve the above problems:

[0048] A pushing assembly 4 is arranged between the supporting rod 401 and the push plate 410, the pushing assembly 4 includes a first pushing part and a second pushing part, the first pushing part is located below the second pushing part, the first pushing part and the second pushing part are vertically arranged in a one-to-one correspondence, and the first pushing part is fixedly connected with the second pushing part through the connecting plate 403.

[0049] The first pushing part comprises a cylinder 402, the telescopic end of the cylinder 402 is provided with a disc 405, the end of the disc 405 away from the cylinder 402 is connected with a connecting seat 407 through a spring 406, the end of the connecting seat 407 away from the spring 406 is provided with a hinged shaft 409, the outer side of a push plate 410 is provided with a supporting seat 411, the supporting seat 411 is movably hinged with the hinged shaft 409, the supporting seat 411 is provided with two, the two supporting seats 411 are vertically corresponding, the upper supporting seat 411 is arranged at the middle part of the push plate 410, the push plate 410 is provided with a sliding groove 412 at the corresponding position of the lower supporting seat 411, the sliding groove 412 is slidably connected with the lower supporting seat 411, the upper cylinder 402 is kept fixed, when the lower cylinder 402 extends, the push plate 410 rotates around the upper hinged shaft 409 as the center, in this process, the lower supporting seat 411 slides in the sliding groove 412, the disc 405 is provided with a second pressure sensor.

[0050] Based on the intermittent impact of the push plate 410 on the bag during the process of the above embodiment one, after each impact of the push plate 410 on the bag, the push plate 410 is finally kept at the position close to the side wall of the bag but not in contact with the bag through the forward rotation of the gear 1042 driven by the motor 1043, in the process of conveying the material into the bag, when the material on a certain side is excessively accumulated in the bag, the bag on this side will protrude outward due to the increase of the internal pressure and contact with the push plate 410, the protruding part of the bag will compress the spring 406, the end of the inserting rod 408 away from the disc 405 will slide into the connecting seat 407, the pressure threshold P1 is pre-set in the second pressure sensor, the pressure threshold detected by the second pressure sensor corresponding to the spring 406 will increase and reach the threshold P1, so as to determine the direction of the excessive accumulation of the material in the bag, after the second pressure sensor detects the change of the pressure of the bag, firstly, according to the input speed of the material in the bag and the input time of the material into the bag through the feeding pipe 102, it is determined whether the current height of the material in the bag is above or below the middle layer of the bag, when the material in the bag is below the middle layer of the bag at this time, the upper cylinder 402 corresponding to this side is kept stationary, the lower cylinder 402 extends and contracts at a high frequency and short distance, drives the push plate 410 to swing repeatedly around the upper hinged shaft 409 as the center at a high frequency, when the push plate 410 swings inward slightly, it will contact with the side wall of the bag, the material in the protruding part of the bag is moved to the inside of the bag through the collision and extrusion of the push plate 410 on the bag, so as to correct the irregular distribution of the material in the bag in the process of conveying the material into the bag, ensure that the center of gravity of the bag maintains in the middle part after the material in the bag is conveyed completely, so as to avoid the problem of yawing caused by the unstable center of gravity when the bag is lifted upward.

[0051] It should be noted that when the center of gravity of the bag is unstable when it is lifted upward, although the center of gravity of the bag can be adjusted by the independent control of the screw drive mechanism in the slide 3021, when the horizontal distance of the lifting part 303 adjusted by the screw drive mechanism is large, the change of the hook position will change the suspension posture of the bag, making the docking of the bag with the pressing plate 202 more difficult, and when the pressing plate 202 is pressing the material in the bag, due to the change of the suspension posture of the bag, the uneven distribution of the surface pressure on the material in the bag will affect the compaction effect of the material and the overall stability of the bag during the load test.

[0052] In summary, by controlling the extension length of the first and second pushing parts, the material in the bag is evenly distributed in time according to the input amount of the material in the bag during the feeding process, so that the center of gravity of the bag is adjusted in time, and the material in each level of the bag is distributed regularly, and the center of gravity is close to the middle of the bag, thereby improving the stability of the bag during lifting, and avoiding the problems of collision with nearby objects and material spilling during lifting.

[0053] Example three

[0054] Please refer to Figures 1 to 8 As the pressing plate 202 continues to press the material in the bag, the local area of the bag will deform and expand after bearing a large pressure load, and the deformation and expansion will cause the local part of the bag to bulge, which will reduce the contact area between the bag and the pressing plate 202, aggravate the unevenness of the pressure distribution, and cause the side of the bag close to the bulge to bear excessive pressure, increasing the risk of damage. To this end, the following improvements are made:

[0055] In use, as the hydraulic cylinder 2 drives the pressure plate 202 to continuously move downward, the pressure load borne by the bag and the material inside it becomes larger and larger, and finally the bag locally deforms and expands under the pressure of the pressure plate 202. At this time, the bag is inside the push plate 410, and the deformed and expanded direction of the bag will cause extrusion to the push plate 410 on that side. The second pressure sensor has a preset pressure threshold P2, and the pressure threshold P2>P1. During the process in which the hydraulic cylinder 2 extrudes the material in the bag through the pressure plate 202, when the second pressure sensor detects that the pressure threshold reaches P2, it indicates that the bag locally deforms and expands. According to the position of the second pressure sensor with the increased pressure threshold, the deformed and expanded direction of the bag is determined. Then the other direction cylinders 402 are synchronously extended inward to make the spring 406 compressed to the shortest length, and the inserting rod 408 is inserted into the connecting seat 407 to make the push plate 410 tightly fit the outside of the bag. At this time, the hydraulic cylinder 2 stops driving the pressure plate 202 to move downward, so that the position of the pressure plate 202 remains unchanged. Then the two cylinders 402 on the expansion side are synchronously and quickly extended and retracted. When the two cylinders 402 are synchronously extended, the push plate 410 is quickly moved to the bag, and the push plate 410 first contacts the deformed and expanded area of the bag to extrude the expanded area of the bag. With the continuous and quick extension of the extension end of the cylinder 402, the spring 406 is quickly compressed, the inserting rod 408 is quickly moved into the connecting seat 407, and the connecting seat 407 is impacted by the inserting rod 408. The impact force is transmitted to the push plate 410 through the hinged shaft 409 and the support seat 411 in turn. In the process of repeated and quick extension and retraction of the extension end of the cylinder 402, the push plate 410 repeatedly acts on the expanded area of the bag with extrusion force and impact force, so that the material in the expanded area of the bag moves to the inside of the bag in the process of extrusion and impact. The retracted position of the extension end of the cylinder 402 is the same as the initial position, that is, when the cylinder 402 is retracted, if the material in the expanded area of the bag has already moved inward, the pressure threshold detected by the second pressure sensor will be lower than P2, indicating that the elimination of the expanded area of the bag has been completed, and the limiting cooperation of the push plate 410 on the other side to the bag is realized. Under the repeated extrusion and impact of the push plate 410 on the expansion side to the bag, the shape of the bag is restored, so as to avoid uneven distribution of pressure on the material in the bag by the pressure plate 202, and to avoid damage to the bag when the pressure of the pressure plate 202 becomes larger and larger.

[0056] In summary, the repeated extrusion and impact of the push plate 410 on the expansion side to the deformed and expanded area of the bag makes the shape of the bag restored, keeps the center of gravity of the bag stable, and further maintains the stability of the subsequent load-bearing test of the bag.

[0057] In order to test the load limit of the bag, the hydraulic cylinder 2 will continue to increase the pressure on the bag and its internal material through the pressing plate 202. When the load borne by the bag and its internal material reaches a high level, the deformation and expansion of the bag also increases. A pressure threshold P3 is preset in the second pressure sensor, P3>P2. When the pressure threshold detected by the second pressure sensor on one side reaches P3, the deformation and expansion of the bag reaches a large degree. Then the process of eliminating the expansion area of the bag by the push plate 410 will be stopped. As the expansion area of the bag becomes larger and larger, the four-directional air cylinder 402 drives the push plate 410 to contract synchronously according to the pressure value detected by the second pressure sensor on the expansion side, so as to reduce the excessive friction between the push plate 410 and the bag. When the pressure threshold detected by the first pressure sensor in the oil circuit of the hydraulic cylinder 2 shows a decreasing trend, it indicates that the expansion area of the bag is broken and the bag reaches the load limit. At the same time, the air cylinder 402 located below in the four directions is controlled to extend synchronously, so that the bottom end of the push plate 410 flips towards the bag, and the bottom ends of the four push plates 410 are butted. At this time, the four push plates 410 form a bucket-shaped structure as a whole. Through the butt joint of the bottom ends of the four push plates 410, the stability of supporting the material is improved, and the situation that the material scatters everywhere due to the rupture of the bag is prevented, so as to ensure that the material remains concentrated during the test process, thereby facilitating subsequent cleaning or processing.

[0058] It should be noted that when the bottom ends of the four push plates 410 are butted, the two push plates 410 corresponding to the expansion side of the bag are located inside the other two push plates 410. During the subsequent recovery of the material in the bag, the push plate 410 close to the expansion side of the bag is contracted by the air cylinder 402 below, so that the push plate 410 tends to be vertical, the outlet at the bottom of the bucket-shaped structure is offset and expanded towards the expansion side of the bag, and the material is recovered through the outlet at the bottom of the bucket-shaped structure. During this process, the push plate 410 opposite to the expansion side of the bag is repeatedly swung by the high-frequency extension and contraction of the air cylinder 402 below, so as to disturb the material in the bucket-shaped structure and accelerate the ejection and recovery efficiency of the material in the bucket-shaped structure.

[0059] Further, when the material in the bag is ejected outward by the push plate 410, some material will adhere to the inner wall of the push plate 410 and form hard lump-shaped material on the inner wall of the push plate 410. The accumulation of these hard lump-shaped materials will affect the normal use of the push plate 410. To this end, the following improvements are made:

[0060] When the material in the bucket structure is completed, the hydraulic cylinder 2 controls the extension end to move out of the bag, and then the electromagnetic bolt in the gap 3034 releases the locking of the support column 3033, the electric lifter 3032 drives the support column 3033 to disengage from the gap 3034, and the lifting ring of the bag is taken off from the support column 3033, then the four push plates 410 are kept vertical under the drive of the four-direction cylinder 402, and the inside of the four push plates 410 is sized and adapted to the pressing plate 202 under the drive of the cylinder 402, at this time, the hard lump-shaped impurities formed by the push plate 410 and the pressing plate 202 are scraped off downward by the downward extension of the hydraulic cylinder 2, in this process, when the pressure in the oil circuit of the hydraulic cylinder 2 continues to increase, it indicates that the hard lump-shaped impurities and other impurities are more and more accumulated between the push plate 410 and the pressing plate 202, at this time, the hydraulic cylinder 2 stops driving the pressing plate 202 to move downward, and the four push plates 410 are repeatedly contracted and extended by the four-direction cylinder 402, so that the vibration is generated between the push plate 410 and the pressing plate 202, the material at the bottom edge of the pressing plate 202 is vibrated and fallen downward, the cleaning efficiency of the hard lump-shaped impurities and other impurities in the push plate 410 is improved, and the stability of the push plate 410 in subsequent use is ensured.

[0061] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent transformation or direct or indirect application in the related technical field based on the content of the specification and drawings of the present application is also included in the patent protection scope of the present application.

Claims

1. A load-bearing performance testing device, comprising a bearing frame (1), a hydraulic cylinder (2) and a lifting assembly (3), the lifting assembly (3) comprising a hollow seat (301), a supporting plate (302) and a hoisting part (303), the hydraulic cylinder (2) extending through the hollow seat (301) and being provided with a pressing plate (202), characterized in that: a first pressure sensor is arranged in the oil circuit of the hydraulic cylinder (2), an electromagnetic bolt is arranged in the hollow seat (301), a sliding groove (103) is arranged in the inner side of the supporting leg of the bearing frame (1), and an electromagnetic lock (304) is arranged at the end of the side of the supporting plate (302) close to the bearing frame (1); a driving mechanism (104) is arranged at the bottom of the bearing frame (1), the driving mechanism (104) drives four push plates (410) to move horizontally repeatedly through a support rod (401), and the set bag on the hoisting part (303) is impacted and disturbed; a pushing assembly (4) is arranged between the support rod (401) and the push plate (410), the pushing assembly (4) comprises a first pushing part and a second pushing part, the first pushing part and the second pushing part are the same in structure and vertically correspond to each other, the first pushing part comprises a gas cylinder (402), the telescopic end of the gas cylinder (402) is provided with a disc (405), the end of the disc (405) away from the gas cylinder (402) is connected with a connecting seat (407) through a spring (406), and the end of the connecting seat (407) away from the spring (406) is movably hinged with the push plate (410) through a hinge shaft (409); the first pushing part is fixedly connected with the second pushing part through a connecting plate (403), the first pushing part is located below the second pushing part, the outer side of the push plate (410) is provided with a support seat (411), the support seat (411) is movably hinged with the hinge shaft (409), the support seat (411) is provided with two, the two support seats (411) vertically correspond to each other, the push plate (410) is provided with a sliding groove (412) at the corresponding position of the lower support seat (411), the sliding groove (412) is slidably connected with the lower support seat (411), and elastic covers (413) are arranged between adjacent two push plates (410); the telescopic end of the hydraulic cylinder (2) is detachably connected with the pressing plate (202), the shape of the pressing plate (202) is matched with the shape of the set bag, the oil pressure in the oil circuit is detected by using the first pressure sensor, the acting force of the pressing plate (202) on the set bag is calculated, and when the hydraulic cylinder (2) drives the pressing plate (202) to move downward, the resistance of the hard block-shaped object on the inner wall of the push plate (410) to the pressing plate (202) is detected to detect whether there is a hard block-shaped object on the inner wall of the push plate (410). ​ The lifting part (303) comprises a lifting seat (3031) in inverted U-shaped structure, the inside of the lifting seat (3031) is provided with an electric lifter (3032), the telescopic end of the electric lifter (3032) is provided with a supporting column (3033), one side of the lifting seat (3031) is provided with a notch (3034) corresponding to the supporting column (3033), the inside of the notch (3034) is provided with an electromagnetic bolt, the notch (3034) is locked and fixed with the supporting column (3033) through the electromagnetic bolt, the top of the lifting seat (3031) is provided with a supporting section (3035), the top end of the supporting section (3035) penetrates through a sliding way (3021), the supporting section (3035) is fixedly connected with the moving end of a transmission mechanism in the sliding way (3021), and the top of the supporting column (3033) is provided with a curved groove. The middle part of the supporting plate (302) is provided with a sliding way (3021), the inside of the sliding way (3021) is provided with a transmission mechanism, the transmission mechanism is a lead screw transmission mechanism, and the moving end of the transmission mechanism is fixedly connected with the lifting part (303); the hydraulic cylinder (2) is located in the middle part of the bearing frame (1), the hollow seat (301) is locked and fixed with the telescopic end of the hydraulic cylinder (2) through an electromagnetic bolt, the supporting plate (302) is locked and fixed with the sliding groove (103) through an electromagnetic lock (304), and the fixed end of the hydraulic cylinder (2) is provided with a flange plate, and the hydraulic cylinder (2) is fixedly connected with the ceiling through the flange plate.

2. The load bearing performance testing apparatus of claim 1, wherein: The supporting plate (302) is arranged outside the hollow seat (301), the supporting plate (302) is provided with four, the four supporting plates (302) are respectively corresponding to the four supporting legs of the bearing frame (1), and the electromagnetic lock (304) is arranged at one end of the supporting plate (302) away from the hollow seat (301).

3. The load bearing performance testing apparatus of claim 1, wherein: The driving mechanism (104) comprises a driving box (1041), a gear (1042) and a motor (1043), two groups of moving grooves (1044) are formed in the driving box (1041), the two groups of moving grooves (1044) are staggered up and down, each group of the moving grooves (1044) comprises two parallel moving grooves (1044), the two groups of the moving grooves (1044) are perpendicular to each other and penetrate through the driving box (1041), one group of the moving grooves (1044) penetrates through the driving box (1041) left and right, the other group of the moving grooves (1044) penetrates through the driving box (1041) front and back, the moving grooves (1044) are provided with rack plates (1045) meshing with the gear (1042), one end of the rack plates (1045) away from the driving box (1041) is provided with a supporting rod (401), the bottom of the bearing frame (1) is provided with an opening (1046), and one end of the supporting rod (401) away from the driving box (1041) penetrates through the opening (1046) and is connected with a push plate (410).

4. The load bearing performance testing apparatus of claim 3, wherein: The gear (1042) is rotationally connected in the middle of the driving box (1041), the motor (1043) is fixedly installed at the bottom of the driving box (1041), the rotating shaft of the motor (1043) penetrates through the bottom of the driving box (1041) and is fixedly connected with the middle of the gear (1042), and the moving groove (1044) is correspondingly matched with the gear (1042).

5. Use of the load-bearing performance testing device according to any one of claims 1-4 in the production of a flexible intermediate bulk container.

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