A material cut resistance testing device

Abstract

A kind of material cutting resistance testing device, including cabinet, balance beam is equipped in cabinet, balance beam is rotatably connected to cabinet by support shaft, balance beam outer end is equipped with adjustable weight, inner end is contacted with the bottom of movable plate;The top of movable plate is connected with supporting plate, and the guiding of supporting plate two sides is realized by the cooperation of vertical guide rod and guide sleeve bearing;The top of movable plate is also provided with pressure sensor, and the movable cutting knife assembly is installed on the top of cabinet corresponding to supporting plate position, and sample support is arranged on supporting plate.The device is driven by lever of balance beam and weight assembly, and real-time monitoring is combined with pressure sensor, to ensure that the contact pressure of sample and cutting knife is stable and controllable, to avoid the pressure fluctuation of rigid drive;The driving of balance beam based on lever principle makes supporting plate rise smoothly, without contact impact, to ensure that the initial state of test is consistent;Weight assembly supports multi-grade adjustment, adapts to different material test requirements, and the overall structure is simplified, maintenance is convenient, effectively improves test accuracy and standardization.

Description

Technical Field

[0001] This utility model belongs to the field of material cutting test technology, and in particular relates to a material cutting resistance test device. Background Technology

[0002] In the field of material cut resistance testing, for materials that need to resist mechanical hazards, such as hand protective gloves and industrial protective fabrics, achieving stable contact between the sample and the cutting blade and completing a standardized cut is the core requirement of the testing device.

[0003] Existing material cut resistance testing equipment typically employs a rigid direct-drive structure to achieve contact between the sample and the cutting blade for cutting tests. This design usually involves a vertical guide rail inside the chassis, with a sample tray slidably connected to the rail. Rigid drive components, such as cylinders, hydraulic cylinders, or electric push rods, are directly mounted below the tray. A cutting blade assembly is fixed to the top of the chassis. During testing, the rigid drive component is activated, forcibly raising the tray along the vertical guide rail through piston rod pushing or screw extension / retraction until the sample on the tray contacts the top cutting blade. The cutting blade then moves to cut the sample. After cutting, the drive component resets, and the tray falls back down.

[0004] This existing technical solution has significant shortcomings: Firstly, the output force of the rigid drive component is easily affected by external factors, such as fluctuations in the air source pressure on which the cylinder depends, changes or leaks in the viscosity of the hydraulic oil in the hydraulic cylinder, and fluctuations in the speed of the electric push rod motor. These factors can all lead to instability in the driving force when the pallet rises, making it difficult to accurately control the pressure when the sample contacts the cutting blade, thus failing to meet the test requirements for contact pressure stability. Secondly, the rigid drive and the pallet are rigidly connected, and the pallet's rising speed is prone to sudden increases or decreases. Furthermore, the instant the sample contacts the cutting blade, an impact is likely to occur, which may damage the sample or the cutting blade edge and disrupt the consistency of the initial contact state. At the same time, the pressure monitoring and drive adjustment in the existing structure lack efficient coordination. Even with a pressure sensor, the output force of the rigid drive component needs to be indirectly adjusted through the control system, resulting in a lag in adjustment. During the cutting process, the contact pressure is prone to deviate from the preset value, leading to a decrease in the accuracy of the test data and making it difficult to meet the standardization and reliability requirements of material cut resistance testing. Utility Model Content

[0005] This invention provides a material cut resistance testing device, which aims to solve the problems of unstable contact pressure, impact, poor device adaptability, and complex structure in the existing rigid drive test.

[0006] This utility model is implemented as follows: a material cut resistance testing device includes a chassis, a horizontal plate is provided inside the chassis, a guide rod is vertically and movably provided through the horizontal plate via a guide sleeve bearing, a support plate is provided at the top of the guide rod, a sample support body for supporting the sample is detachably provided on the support plate, and a cutting blade assembly is provided at the top of the chassis.

[0007] A movable plate that can move vertically along the guide rod is provided between the horizontal plate and the support plate, and a pressure sensor that can detect the pressure between the movable plate and the support plate is provided on the top of the movable plate;

[0008] It also includes a balance beam, the middle of which is rotatably connected to the chassis via a support shaft, with one end extending outside the chassis. A weight assembly is mounted on the outer end of the balance beam. Under the weight of the weight assembly, the inner end of the balance beam is lifted, pushing a movable plate to lift the support plate and bring the sample into contact with the cutting blade assembly.

[0009] Preferably, the top center of the sample support is provided with an arc-shaped protrusion, and the top two sides of the tray are provided with guide grooves. The sample support is pulled out and placed on the top of the tray through the guide grooves. The two sides of the sample support are provided with elastic retaining beads, and the rear end of the inner sidewall of the guide groove is provided with a positioning groove that cooperates with the elastic retaining beads.

[0010] Preferably, the cutting blade assembly includes a longitudinal electric guide rail disposed on the top of the inner wall of the chassis, a transverse electric guide rail disposed at the bottom of the sliding part of the longitudinal electric guide rail, a mounting plate disposed at the bottom of the sliding part of the transverse electric guide rail, and a clamping plate that can be adjusted in front and back position disposed on the rear side of the mounting plate by means of adjusting bolts. A cutting blade is detachably disposed between the clamping plate and the mounting plate.

[0011] Preferably, the weight assembly includes a hook disposed at the outer end of the balance beam, and a weight pan for placing weights is disposed at the bottom end of the hook.

[0012] Preferably, the bottom of the movable plate is provided with a roller that contacts the upper surface of the inner end of the balance beam.

[0013] Preferably, a drive motor is fixedly connected to the horizontal plate, and a drive rod perpendicular to the output shaft of the drive motor is fixedly connected to the output shaft of the drive motor. When the drive motor drives the drive rod to rotate downward, it presses down the inner end of the balance beam.

[0014] Beneficial effects

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: The material cut resistance testing device of this utility model uses a balance beam as the core driving structure. The middle part of the balance beam is rotatably connected to the chassis through a support shaft, and the outer end is equipped with a weight assembly. By means of the lever principle, the gravity of the weight is stably transmitted to the inner end, which pushes the movable plate to drive the pallet to rise smoothly, avoiding the problem of sudden pressure changes in rigid drive. At the same time, the pressure sensor on the top of the movable plate detects the contact pressure in real time, ensuring that the change of cutting force meets the test requirements and avoiding the distortion of test data caused by pressure fluctuations. The balance beam drive makes the pallet rise at a uniform speed, and there is no impact when the sample contacts the cutting blade, which effectively avoids damage to the sample or cutting blade. Moreover, the pallet is guided by a guide rod to ensure stable movement, ensuring that the initial contact state is consistent for each test, reducing errors caused by unstable contact, and meeting the test specification requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the cutting blade assembly in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the balance beam of this utility model;

[0020] Figure 5 This is a schematic diagram of the drive motor and drive rod in this utility model.

[0021] In the diagram: 1-Chassis, 2-Balance beam, 3-Weight assembly, 31-Hook, 32-Weight pan, 33-Weight, 4-Horizontal plate, 5-Guide sleeve bearing, 6-Guide rod, 7-Support plate, 8-Sample support, 9-Cut blade assembly, 91-Longitudinal electric guide rail, 92-Transverse electric guide rail, 93-Mounting plate, 94-Adjusting bolt, 95-Clamping plate, 96-Cut blade, 10-Moving plate, 11-Vernier, 12-Roller, 13-Drive motor, 14-Drive rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] Please see Figure 1-5This utility model provides a technical solution: a material cut resistance testing device, including a chassis 1, a status indicator light on the top of the chassis 1, and a control switch, an emergency stop switch, and an observation port on the front of the chassis 1.

[0024] The bottom four corners of the chassis 1 are equipped with height-adjustable feet, and the top of the chassis 1 is equipped with a reference level. The equipment accessories include a bar level. When installing the equipment, you can first refer to the level to make a rough adjustment to the feet, and then use the bar level to make a fine adjustment to ensure that the equipment is level.

[0025] After the main unit is securely installed, place the industrial computer on the right side of the instrument. Connect the force value port to the COM1 port of the industrial computer using a nine-pin serial communication cable, and connect the control port to the COM2 port. If the connections are reversed, the ports can be reset in the software.

[0026] If using a keyboard and mouse, plug the wireless receivers of the keyboard and mouse into any USB port of the industrial PC, and place the keyboard and mouse in front of the industrial PC. Connect the power to both the equipment and the industrial PC, turning on the equipment power first, then the industrial PC power. After the industrial PC starts up, the control software will automatically start and automatically perform the tool zeroing operation. After completion, the system will enter the ready state.

[0027] A horizontal plate 4 is provided inside the casing 1. A guide rod 6 is vertically and movably connected through the horizontal plate 4 via a guide sleeve bearing 5. A support plate 7 is provided at the top of the guide rod 6. A sample support body 8 for supporting the sample is detachably provided on the support plate 7. A cutting blade assembly 9 is provided at the top inside the casing 1.

[0028] The support plate 7 can move synchronously with the guide rod 6. When subjected to an upward thrust, the two continue to move upward, lifting the sample support 8 upward so that the sample on the sample support 8 comes into contact with the cutting blade 96 in the cutting blade assembly 9. The cutting test is performed by the movement of the cutting blade 96. When the upward thrust is released, under the action of gravity of the support plate 7, the sample support 8 and the guide rod 6, the sample will overcome the small friction between the guide rod 6 and the guide sleeve bearing 5 and return to its original position.

[0029] The sample support 8 can be removed from the tray 7 to replace the sample to be tested.

[0030] It also includes a balance beam 2, the middle part of which is rotatably connected to the housing 1 via a support shaft and one end of which extends to the outside of the housing 1. The outer end of the balance beam 2 is provided with a weight assembly 3. The inner end of the balance beam 2 is lifted under the gravity of the weight assembly 3, which pushes the movable plate 10 to lift the support plate 7 and move it upward so that the sample comes into contact with the cutting blade assembly 9.

[0031] A movable plate 10, which can move vertically along the guide rod 6, is provided between the horizontal plate 4 and the support plate 7. A pressure sensor is provided on the top of the movable plate 10 to detect the pressure between the movable plate 10 and the support plate 7. The pressure sensor is fixed at the center of the top of the movable plate 10 and can be completely in contact with the bottom of the support plate 7 to ensure that the pressure transmitted by the support plate 7 can be completely and evenly applied to the sensor, avoiding force detection errors caused by sensor misalignment. A CPT6100 pressure transmitter can be selected as the pressure sensor.

[0032] A support plate is provided on the inner side of one side wall of the casing 1. A support shaft is provided on the support plate via a mounting seat. The balance beam 2 is mounted on the equipment via the support shaft and can rotate in the vertical plane around the support shaft. Its outer end can rotate downward under the action of the weight assembly 3, so that the inner end can move upward along an arc trajectory, thereby pushing the movable plate 10 to move upward along the guide rod 6. When the movable plate 10 touches the bottom of the support plate 7, the force of the balance beam 2 will act on the support plate 7 through the movable plate 10, so that the support plate 7 and the guide rod 6 move upward under the guidance of the guide sleeve bearing 5, thereby causing the sample support 8 to move upward until the sample contacts the cutting blade 96 in the cutting blade assembly 9. At this time, the sample is in place.

[0033] The contact pressure between the sample and the cutting blade 96 in the cutting blade assembly 9 is determined by the weight assembly 3. The heavier the loaded weight 33, the more obvious the tendency of the inner end of the balance beam 2 to move upward, the greater the thrust on the movable plate 10, and the greater the upward thrust acting on the support plate 7 and the sample support 8.

[0034] When the cutting blade 96 comes into contact with the sample, it generates contact pressure. This contact pressure acts on the sample support 8, which in turn acts on the tray 7, and then on the pressure sensor. The pressure sensor senses the pressure (i.e., the "cutting force") transmitted by the tray 7 in real time and transmits the force value data to an external industrial control computer via a signal line to ensure that the cutting force is always within the set range and to avoid distortion of test data due to force fluctuations (the cutting force change is required to be < ±5%).

[0035] Please refer to Figure 4 Furthermore, the top center of the sample support 8 is provided with an arc-shaped protrusion with a radius of 38±0.5mm. The effective installation length of the sample support 8 is >110mm, which meets the requirements for the sample support structure.

[0036] Guide grooves are formed on both sides of the top of the tray 7 along its length. The width of the guide grooves is 0.1-0.2 mm away from the thickness of the sample support 8. The sample support 8 is retractably mounted on the top of the tray 7 via the guide grooves. Elastic retaining beads are provided on both sides of the sample support 8. A positioning groove that mates with the elastic retaining beads is provided on the rear end of the inner wall of the guide groove. The pop-out height of the elastic retaining beads is 1-1.5 mm. The positioning groove on the rear end of the inner wall of the guide groove is adapted to the pop-out height of the elastic retaining beads. When the elastic retaining beads are engaged in the positioning groove, the axial offset of the sample support 8 is ≤0.5 mm, ensuring accurate installation of the sample support 8 and avoiding the impact of installation offset on the cutting position accuracy.

[0037] When installing the sample, pull out the sample support 8 from the tray 7. Attach two double-sided adhesive tapes symmetrically to both sides of the support's arc, leaving a gap of 10±2mm between the tapes. If the sample is conductive, attach a plastic film with a thickness no greater than 0.03mm to the center of the support. If it is a multi-layered material, sew the material along the edges. If it is a loosely knitted material, place a layer with a mass less than 65g / m² between the support surface and the sample. 2 The filter paper is then used. After processing, the sample is fixed on the support body, and tension on the sample is minimized. The sample support body 8 is then pushed back to the tray 7 through the guide groove until the elastic ball is inserted into the positioning groove, thus completing the sample installation.

[0038] Please refer to Figure 3 Furthermore, the cutting blade assembly 9 includes a longitudinal electric guide rail 91 disposed on the top of the inner wall of the housing 1. A transverse electric guide rail 92 is disposed at the bottom of the sliding part of the longitudinal electric guide rail 91. A mounting plate 93 is disposed at the bottom of the sliding part of the transverse electric guide rail 92. A clamping plate 95 with adjustable front and rear positions is disposed on the rear side of the mounting plate 93 by adjusting bolts 94. A cutting blade 96 is detachably disposed between the clamping plate 95 and the mounting plate 93.

[0039] In this embodiment, the longitudinal electric guide rail 91 is used to adjust the front and rear positions so that the cutting blade 96 is in the middle position of the sample, and the transverse electric guide rail 92 is used to push the cutting blade 96 to move laterally to cut the sample.

[0040] Both the longitudinal electric guide rail 91 and the transverse electric guide rail 92 are lead screw structure guide rails. The effective stroke of the longitudinal electric guide rail 91 is ≥100mm, and the effective stroke of the transverse electric guide rail 92 is ≥50mm. The moving speed accuracy of the longitudinal electric guide rail 91 and the transverse electric guide rail 92 is ±0.1mm / s, and the moving distance accuracy is ±0.05mm. They can accurately control the movement speed and position of the cutting blade 96, meeting the requirements of a blade cutting movement speed of 2.5mm / s and a movement distance accuracy of 0.1mm.

[0041] The cutting blade 96 has a hardness >45HRC, a cutting edge angle of 20.5°, and a thickness of 1.00mm, which meets the standard requirements for cutting blade parameters. The distance between the clamping plate 95 and the mounting plate 93 can be adjusted by rotating the adjusting bolt 94, so as to achieve a firm clamping and quick replacement of the cutting blade 96.

[0042] The lower part of the inner side of the clamping plate 95 is provided with a mounting groove, and the upper part of the cutting blade 96 is formed to fit the mounting groove, so that the upper part of the cutting blade 96 can be inserted into the mounting groove and clamped between the clamping plate 95 and the mounting plate 93 to prevent tilting when subjected to force and affecting the cutting effect.

[0043] The inner side of the clamping plate 95 may be provided with a positioning protrusion, and the rear side of the mounting plate 93 may be provided with a corresponding positioning hole. When the adjusting bolt 94 is tightened, the positioning protrusion is engaged into the positioning hole, so that the two are connected and fixed, thereby ensuring the stability of the cutting blade 96. The adjusting bolt 94 is a hand-tightening bolt.

[0044] Furthermore, the weight assembly 3 includes a hook 31 disposed at the outer end of the balance beam 2, and a weight pan 32 for placing weights 33 is disposed at the bottom end of the hook 31.

[0045] The mass error of the weight pan 32 is ≤1g. The weights 33 include 1N, 2N, 5N, 10N, 20N, 50N, and 100N specifications. There are two 2N weights, two 20N weights, and one weight for each of the other weights. The mass error of the 1N-100N weights is ≤0.1%, which can realize load adjustment in 1N increments to meet the loading requirements of different cutting forces. The inner end of the balance beam 2 is lifted under the gravity of the weight assembly 3. The roller 12 pushes the movable plate 10 to lift the support plate 7 upward, so that the sample contacts the cutting blade assembly 9, realizing stable loading of the cutting force.

[0046] The bottom of the movable plate 10 is provided with a roller 12 that contacts the upper surface of the inner end of the balance beam 2. The roller 12 is made of polytetrafluoroethylene with a surface roughness Ra≤0.8μm, which can reduce the friction between the movable plate 10 and the balance beam 2, avoid fluctuations in the loading force due to friction, and ensure that the cutting force change is <±5%.

[0047] A drive motor 13 is fixedly connected to the horizontal plate 4. A drive rod 14 perpendicular to the output shaft of the drive motor 13 is fixedly connected to the drive rod 14. When the drive motor 13 drives the drive rod 14 to rotate downward, it presses down the inner end of the balance beam 2.

[0048] The drive motor 13 is a stepper motor. When the inner end of the balance beam 2 is at its highest point, the drive motor 13 rotates so that the end of its drive rod 14 contacts the upper part of the inner end of the balance beam 2. Then, it continues to rotate, pressing the inner end of the balance beam 2 down to its lowest point through the drive rod 14, i.e., against the horizontal plate 4. At this point, the balance beam 2 no longer exerts a pushing force on the movable plate 10. The support plate 7, the sample support 8, and the guide rod 6 fall to their lowest point under the action of gravity, making it easy to disassemble the sample support 8 and replace the sample. A rubber buffer pad is installed on the horizontal plate 4 at the position corresponding to the inner end of the balance beam 2 to prevent the inner end of the balance beam 2 from directly impacting the horizontal plate 4 when it is pressed down, thus extending the service life of the components.

[0049] The length of the drive rod 14 is determined by the requirement that it can drive the balance beam 2 to fall without interfering with other components.

[0050] The outer end of the balance beam 2 is also equipped with a vernier 11 that can slide along its length to help observe the rotation angle of the balance beam. At the same time, it can be used in conjunction with the adjustment of the weight loading to ensure that the thrust at the inner end of the balance beam 2 is accurate and controllable.

[0051] The chassis 1 is also equipped with a tool zeroing mechanism. The tool zeroing mechanism includes a limit sensor fixed to one end of the longitudinal electric guide rail 91. The limit sensor is connected to the industrial control computer. After the machine is powered on, the industrial control computer can control the longitudinal electric guide rail 91 and the transverse electric guide rail 92 to move the cutting blade 96 to the position of the limit sensor, complete the tool zeroing operation, and ensure that the starting position of each cut is consistent.

[0052] At the start of the test, a weight 33 of appropriate specifications is placed on the weight pan 32. The cutting position is set via the industrial control computer (the distance between adjacent cutting positions is not less than 10mm, and a maximum of 10 positions can be selected). The initial cut is performed, and the longitudinal electric guide rail 91 and the transverse electric guide rail 92 drive the cutting blade 96 to move to the first cutting position to start cutting. During the cutting process, the pressure sensor detects the pressure data in real time and transmits it to the industrial control computer. After the cut is complete, the blade automatically stops, and the test data is recorded to the industrial control computer. The specifications of the weight 33 are adjusted according to the initial test results to ensure that at least five readings are within the ranges of 5mm to 15mm, 15mm to 30mm, and 30mm to 50mm, respectively. Then, a verification test is performed. The cutting force is adjusted to the required cutting force for 20mm, the cutting position is set, and at least five cuts are completed. If the average cutting length is between 18-22mm, the test is completed, the data can be saved, and a test report can be generated. If the requirements are not met, five more cuts are performed, the verification data is added to the initial test set, and the standard cutting force value is recalculated.

[0053] During the test, if the sharpness of the blade needs to be corrected, the cutting blade 96 can be removed, the support plate (7) can be released and the balance can be adjusted. The neoprene rubber sheet can be placed on the support plate 7 in the same way as the sample can be placed. The cutting blade 96 can be reinstalled, a 5N weight can be loaded, the cutting position can be set, and the "blade calibration" button on the industrial control computer can be clicked to complete at least ten cuts. If the cutting length is between 20-30mm and the variation from the historical average is not more than 10%, the "recalculate" button on the industrial control computer can be clicked to update the blade correction coefficient. If force calibration is required, all weights 33 can be removed, buffer material can be installed on the support plate 7, the cutting blade 96 can be removed and the support plate 7 can be released. The balance beam 2 can be adjusted to a balanced state, the cutting blade 96 can be reinstalled, the "enter calibration" button on the industrial control computer can be clicked, and different specifications of weights 33 can be loaded in sequence to complete the calibration operation to ensure accurate force measurement.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A material cut resistance testing device, comprising a chassis (1), characterized in that: A horizontal plate (4) is provided inside the chassis (1). A guide rod (6) is vertically and movably connected through the horizontal plate (4) via a guide sleeve bearing (5). A support plate (7) is provided at the top of the guide rod (6). A sample support body (8) for supporting the sample is detachably provided on the support plate (7). A cutting blade assembly (9) is provided at the top inside the chassis (1). A movable plate (10) that can move vertically along the guide rod (6) is provided between the horizontal plate (4) and the support plate (7). A pressure sensor that can detect the pressure between the movable plate (10) and the support plate (7) is provided on the top of the movable plate (10). It also includes a balance beam (2), the middle part of which is rotatably connected to the chassis (1) via a support shaft and one end extends to the outside of the chassis (1). The outer end of the balance beam (2) is provided with a weight assembly (3). The inner end of the balance beam (2) is lifted under the gravity of the weight assembly (3), which pushes the movable plate (10) to lift the support plate (7) and move it upward so that the sample contacts the cutting blade assembly (9).

2. The material cut resistance testing device as described in claim 1, characterized in that: The top of the sample support (8) is provided with an arc-shaped protrusion in the middle. The top two sides of the tray (7) are provided with guide grooves. The sample support (8) is pulled out and placed on the top of the tray (7) through the guide grooves. The two sides of the sample support (8) are provided with elastic retaining beads. The rear end of the inner sidewall of the guide groove is provided with a positioning groove that cooperates with the elastic retaining beads.

3. The material cut resistance testing device as described in claim 1, characterized in that: The cutting blade assembly (9) includes a longitudinal electric guide rail (91) disposed on the top of the inner wall of the chassis (1). A transverse electric guide rail (92) is disposed at the bottom of the sliding part of the longitudinal electric guide rail (91). A mounting plate (93) is disposed at the bottom of the sliding part of the transverse electric guide rail (92). A clamping plate (95) with adjustable front and rear position is disposed on the rear side of the mounting plate (93) by means of adjusting bolts (94). A cutting blade (96) is detachably disposed between the clamping plate (95) and the mounting plate (93).

4. The material cut resistance testing device as described in claim 1, characterized in that: The weight assembly (3) includes a hook (31) disposed at the outer end of the balance beam (2), and a weight pan (32) for placing weights (33) is disposed at the bottom end of the hook (31).

5. The material cut resistance testing device as described in claim 1, characterized in that: The bottom of the movable plate (10) is provided with a roller (12) that contacts the upper surface of the inner end of the balance beam (2).

6. The material cut resistance testing device as described in claim 1, characterized in that: A drive motor (13) is fixedly connected to the horizontal plate (4), and a drive rod (14) perpendicular to it is fixedly connected to the output shaft of the drive motor (13). When the drive motor (13) drives the drive rod (14) to rotate downward, it presses down the inner end of the balance beam (2).

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