High-precision paper cup hardness tester

Abstract

The utility model provides a high-precision paper cup hardness tester. The high-precision paper cup hardness tester comprises a test platform, a three-jaw self-centering chuck, a screw rod lifting machine, a left pressure applying mechanism, a right pressure applying mechanism, a driving mechanism, a left linear guide rail and a right linear guide rail, the three-jaw self-centering chuck is arranged above the testing platform so that the paper cup can be fixed to the testing axis, the lead screw lifting machine is coaxially connected to the bottom of the three-jaw self-centering chuck through a screw rod, and the left pressure applying mechanism and the right pressure applying mechanism are symmetrically erected on the two sides of the three-jaw self-centering chuck. And the left pressing mechanism and the right pressing mechanism realize high-precision synchronous opposite or reverse linear movement through the driving mechanism, the left linear guide rail and the right linear guide rail, so that a high-precision paper cup stiffness value is obtained when the paper cup is synchronously extruded by the left pressing mechanism and the right pressing mechanism. By optimizing paper cup fixing, lifting, driving and guiding structures, high-precision paper cup stiffness measurement is achieved, and stability and operation convenience are improved.

Description

Technical Field

[0001] This utility model relates to the field of paper cup testing instruments, specifically to a high-precision paper cup hardness tester. Background Technology

[0002] In the production and quality control of paper containers such as paper cups and bowls, cup stiffness is a crucial indicator of their bending resistance, directly impacting the user experience and structural strength. However, existing cup stiffness testers suffer from several drawbacks: First, traditional instruments often use trays or simple clamping structures to fix the paper cups, which can easily lead to deviation of the testing axis due to slight cup offset or tilt, introducing measurement errors and affecting data accuracy. Second, some devices use ordinary stepper motors or asynchronous motors, which suffer from speed fluctuations and transmission lag, making it difficult to ensure precise control of the test stroke (e.g., 9.5±0.5mm), resulting in poor repeatability of test results. Third, some instruments rely on sliding guide rails or ordinary guide rods, which are prone to wear after long-term use, causing unstable movement of the pressure mechanism or even tilting, affecting the reliability of stiffness testing. Finally, standards require the stiffness test point to be located at 2 / 3 of the cup's height, but the lifting mechanism of existing equipment often relies on manual coarse adjustment, making precise positioning difficult and laborious, thus affecting testing efficiency. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a high-precision paper cup hardness tester that can fix the paper cup with high precision, provide stable transmission, accurately guide and is easy to adjust, so as to overcome the defects in the prior art.

[0004] To achieve the above objectives, this utility model provides a high-precision paper cup hardness tester, including a testing platform, a three-jaw self-centering chuck, a screw jack, a left pressure mechanism, a right pressure mechanism, a drive mechanism, a left linear guide rail, and a right linear guide rail. The three-jaw self-centering chuck is mounted above the testing platform to fix the paper cup on the testing axis. The screw jack is fixedly connected below the testing platform and coaxially connected to the bottom of the three-jaw self-centering chuck via a screw. A guide seat is connected to the bottom of the screw jack, and an adjusting handwheel is connected to the input shaft end of the screw jack. Rotating the adjusting handwheel drives the screw, enabling the three-jaw self-centering chuck and the paper cup it holds to move vertically up and down with high precision, thereby adjusting the pressure test point to 2 / 3 of the paper cup's position. The left and right pressure mechanisms are symmetrically mounted on the three-jaw self-centering chuck. The left and right pressure mechanisms are connected at their lower front ends to the left-hand nut of the positive and negative thread ball screws, and at their lower front ends to the right-hand nut of the positive and negative thread ball screws. The left and right ends of the positive and negative thread ball screws are connected to the bottom of the test platform via the first and second fixing plates, respectively, and the right end of the positive and negative thread ball screws is connected to the drive mechanism. The lower rear end of the left pressure mechanism is connected to the left linear guide rail, and the lower rear end of the right pressure mechanism is connected to the right linear guide rail. The left and right linear guide rails are fixedly connected to the bottom surface of the test platform so that when the drive mechanism drives the positive and negative thread ball screws to rotate in the forward or reverse direction, the two pressure mechanisms achieve high-precision synchronous linear movement in opposite directions via the positive and negative thread ball screws and the two linear guide rails, thereby obtaining a high-precision paper cup stiffness value when the left and right pressure mechanisms simultaneously squeeze the paper cup.

[0005] The above technical solution employs a three-jaw self-centering chuck to fix the paper cup, ensuring strict alignment between the cup center and the detection axis. This effectively reduces eccentricity errors, avoids the offset problems that may occur with traditional tray structures, and improves testing accuracy. A screw jack with an adjusting handwheel allows the three-jaw self-centering chuck and paper cup to move easily, smoothly, and vertically, reducing operational effort and avoiding testing errors caused by tilting during cup lifting, thus improving testing accuracy. Left and right linear guides, along with positive and negative toothed ball screws, ensure smooth, offset-free movement of the left and right pressure mechanisms without deformation, avoiding jamming or deformation problems caused by traditional sliding friction, further guaranteeing high testing accuracy and repeatability.

[0006] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, the left pressure mechanism includes a left testing rod and a left connecting rod; the probe of the left testing rod is horizontally oriented towards the three-jaw self-centering chuck, and the left testing rod is connected to the top of the left connecting rod, the lower front end of the left connecting rod is connected to the left-hand nut of the positive and negative thread ball screw, and the lower rear end of the left connecting rod is connected to the left linear guide rail; the right pressure mechanism includes a right testing rod, a high-precision micro force sensor, and a right connecting rod; the probe of the right testing rod is horizontally oriented towards the three-jaw self-centering chuck, and the right testing rod is connected to the high-precision micro force sensor. The force sensor's receiving end and the fixed end of the high-progress miniature force sensor are connected to the top of the right connecting rod. The lower front end of the right connecting rod is connected to the right-hand nut of the positive and negative toothed ball screw, and the lower rear end of the right connecting rod is connected to the right linear guide rail. The left and right connecting rods are symmetrically and vertically mounted on both sides of the three-jaw self-centering chuck. The axes of the left and right test rods are radially opposite each other so that when the left and right connecting rods move synchronously towards each other and the probes of the left and right test rods synchronously press the side wall of the paper cup, the high-progress miniature force sensor starts to record the force value to obtain a high-precision paper cup stiffness value.

[0007] Through the above technical solution, the left and right connecting rods move synchronously toward or away from the three-jaw self-centering chuck via positive and negative toothed ball screws and left and right linear guides, ensuring that the probes of the left and right test rods always move along the central axis, improving the stability of movement, and avoiding eccentric loading or tilting caused by unilateral force, thereby improving the accuracy of the test.

[0008] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, a left rectangular hole and a right rectangular hole are symmetrically provided on the testing platform, with the left connecting rod passing through the left rectangular hole and the right connecting rod passing through the right rectangular hole, so as to limit the travel distance when the left and right connecting rods move synchronously.

[0009] The above technical solution uses the forward and reverse rotation of the ball screw to drive the left and right connecting rods to move synchronously in opposite directions or in opposite directions within their respective left and right rectangular holes. This limits the synchronous displacement range of the right and left connecting rods (e.g., a standard test stroke of 9.5 mm), ensuring the consistency of the stroke in each test and improving test accuracy.

[0010] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, the lower rear end of the left connecting rod is connected to the vertical surface of the left connecting reinforcement seat, and the horizontal surface of the left connecting reinforcement seat is connected to the slider of the left linear guide rail; the lower rear end of the right connecting rod is connected to the vertical surface of the right connecting reinforcement seat, and the horizontal surface of the right connecting reinforcement seat is connected to the slider of the right linear guide rail.

[0011] The above technical solution enhances the rigidity and guiding accuracy of the left and right connecting rods by using the left and right connecting reinforcement seats.

[0012] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, the driving mechanism includes a servo motor, a planetary reducer, a first sprocket, a second sprocket, and a chain; wherein, the output end of the servo motor is connected to the input end of the planetary reducer, the planetary reducer is fixedly connected to the left side of the second fixed plate, the output end of the planetary reducer passes through the second fixed plate and is coaxially connected to the first sprocket, the first sprocket and the second sprocket are connected by chain drive, and the right end of the positive and negative tooth ball screw passes through the second fixed plate and is coaxially connected to the second sprocket, so that the servo motor drives the positive and negative tooth ball screw to rotate in the forward or reverse direction through the planetary reducer, so as to achieve high-precision synchronous pressure application.

[0013] Through the above technical solution, the drive mechanism adopts a servo motor plus a planetary reducer and a forward and reverse toothed ball screw to achieve high-precision, low-vibration transmission, improve the control accuracy of test speed and displacement (such as ±0.02mm), and extend the service life of the equipment.

[0014] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, expansion sleeves are installed between the output end of the planetary reducer and the inner hole of the first sprocket, and between the positive and negative toothed ball screw and the inner hole of the second sprocket, in order to eliminate transmission gaps and improve transmission accuracy.

[0015] By using the above technical solution, the transmission gap can be eliminated and the transmission accuracy improved by setting an expansion sleeve, thus ensuring the stability of the movement of the left and right connecting rods and improving the test accuracy.

[0016] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, the three-jaw self-centering chuck is provided with three jaws, and the three jaws are manually adjusted to open and close by a ratchet wrench to accurately position the paper cup on the test axis.

[0017] Through the above technical solution, the three-jaw self-centering chuck can manually adjust the opening and closing of the jaws by means of a ratchet wrench. The torque scale function of the ratchet wrench can quantitatively adjust the clamping force, which is more suitable for clamping paper cups and avoids the problem of being too tight or too loose due to traditional handle operation.

[0018] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, a control device is also provided on the testing platform. The control device contains a controller, and a touch screen is provided on the upper front side of the control device. The controller is electrically and signal connected to the servo motor of the drive mechanism, the high-precision micro force sensor, and the touch screen, so that the controller controls the servo motor to work through the signal of the touch screen, and processes the force value recorded by the high-precision micro force sensor to obtain the paper cup stiffness value, which is then displayed on the touch screen.

[0019] Through the above technical solution, the controller can be a microcontroller or a PLC controller. The controller controls the servo motor to start according to the input of the touch screen, so that the left and right test rods move towards the paper cup synchronously and squeeze the paper cup. The high-precision micro force sensor will obtain the force value and display it on the touch screen. After obtaining the test result according to the test standard, the controller controls the servo motor to stop automatically, so as to realize automated control.

[0020] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, an emergency stop switch is provided on the lower front side of the control device. The emergency stop switch is electrically and signal connected to the controller so that the controller can cut off the power switch through the signal from the emergency stop switch.

[0021] The above technical solution enables the emergency stop switch to quickly cut off power in emergencies, protecting the tester.

[0022] As a further explanation of the high-precision paper cup hardness tester of this utility model, preferably, a printer is provided on the external right side of the control device. The printer is electrically and signal-connected to the controller so that the controller controls the printer to print the test results through operation.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. In this utility model, a three-jaw self-centering chuck is used to fix the paper cup, ensuring that the center of the paper cup is strictly aligned with the detection axis, effectively reducing eccentricity error, avoiding the offset problem that may be caused by traditional tray structure, and improving test accuracy.

[0025] 2. This utility model uses a screw jack and the three-jaw self-centering chuck and the paper cup held on it can move up and down easily, smoothly and vertically by rotating the adjustment handwheel. This makes the operation easier, avoids test errors caused by tilting of the paper cup during the lifting process, and improves test accuracy.

[0026] 3. In this utility model, left and right linear guides are used for guidance and are matched with positive and negative toothed ball screws to ensure that the left and right pressure mechanisms move smoothly without deviation and without deformation, avoiding the jamming or deformation problems caused by traditional sliding friction, and further ensuring the high accuracy and repeatability of the test.

[0027] 4. In this utility model, the drive mechanism uses a servo motor and a planetary reducer to drive the forward and reverse toothed ball screws to rotate, thereby achieving precise control and stability of the movement of the left and right connecting rods, which can improve testing accuracy and extend service life. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the external structure of the high-precision paper cup hardness tester of this utility model;

[0029] Figure 2 This is a schematic diagram of the internal structure of the high-precision paper cup hardness tester of this utility model;

[0030] Figure 3 This is a schematic diagram of the top surface of the testing platform of the automated paper cup hardness tester of the present invention;

[0031] Figure 4 This is a schematic diagram of the bottom surface of the testing platform of the automated paper cup hardness tester of the present invention;

[0032] Figure 5 This is a schematic diagram of the method for testing the stiffness of paper cups. Detailed Implementation

[0033] In order to further understand the structure, features and other objectives of this utility model, the following detailed description is provided in conjunction with the accompanying drawings. The embodiments described in the drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model.

[0034] As a first embodiment of this utility model, such as Figure 1 As shown, this utility model provides a high-precision paper cup hardness tester, including a testing platform 1, a three-jaw self-centering chuck 2, a screw jack 3, a left pressure mechanism 4, a right pressure mechanism 4', a drive mechanism 5, a left linear guide rail 6, and a right linear guide rail 6'.

[0035] A three-jaw self-centering chuck 2 is mounted above the testing platform 1 to fix the paper cup on the testing axis. The three-jaw self-centering chuck 2 is used to fix paper cups of different sizes. In this embodiment, the three-jaw self-centering chuck 2 is used to fix the paper cup on the testing axis. The synchronous advancement of the three jaws ensures that the deviation between the paper cup axis and the testing axis after clamping is <0.1mm, reducing eccentricity error and making the measured stiffness of the paper cup more accurate. This solves the technical problem that existing tray structures used for placing paper cups may deviate too much from the testing axis during paper cup testing, leading to inaccurate measurement results. The specific structure of the three-jaw self-centering chuck 2 is existing technology, but its three jaws can be adjusted within the existing technology range to accommodate the paper cup, such as matching the curvature of the jaws with the outer wall of the paper cup or adding soft padding.

[0036] The screw jack 3 is fixedly connected below the test platform 1, and is coaxially connected to the bottom of the three-jaw self-centering chuck 2 via a screw 31. A guide seat 32 is connected to the bottom of the screw jack 3, and an adjusting handwheel 33 is connected to the input shaft end of the screw jack 3. By rotating the adjusting handwheel 33, the screw 31 is driven to move the three-jaw self-centering chuck 2 and the paper cup it holds vertically up and down with high precision, thereby adjusting the pressure test point to 2 / 3 of the position of the paper cup. Using a screw jack and rotating the adjusting handwheel allows the three-jaw self-centering chuck and the paper cup it holds to move easily, smoothly, and vertically up and down, making operation easier, avoiding test errors caused by tilting during the lifting and lowering of the paper cup, and improving test accuracy. Typically, the total height of the paper cup is first measured with calipers, and 2 / 3 of its height is calculated and marked with a marker. After fixing the paper cup, the adjusting handwheel 33 is rotated to drive the screw jack 3 to lift and lower the screw 31 until the test rod is aligned with the marked position. When testing paper cups of the same size, you only need to manually adjust the height once, and then you can automatically test samples of different sizes of the same size.

[0037] The left pressure mechanism 4 and the right pressure mechanism 4' are symmetrically mounted on both sides of the three-jaw self-centering chuck 2. The lower front end of the left pressure mechanism 4 is connected to the left-hand nut 81 of the forward and reverse thread ball screw 8, and the lower front end of the right pressure mechanism 4' is connected to the right-hand nut 81' of the forward and reverse thread ball screw 8. The left and right ends of the forward and reverse thread ball screw 8 are connected to the bottom of the test platform 1 through the first fixing plate 12 and the second fixing plate 12', respectively, and the right end of the forward and reverse thread ball screw 8 is connected to the drive mechanism 5. The lower rear end of the left pressure mechanism 4 is connected to the left linear guide 6, and the lower rear end of the right pressure mechanism 4' is connected to the right linear guide 6'. The left linear guide 6 and the right linear guide 6' are fixedly connected to the bottom surface of the test platform 1. When the drive mechanism 5 drives the forward and reverse threaded ball screw 8 to rotate in either direction, the two pressure-applying mechanisms achieve high-precision synchronous linear movement in opposite directions via the forward and reverse threaded ball screw 8 and the two linear guides. This results in a high-precision paper cup stiffness value when the left pressure-applying mechanism 4 and the right pressure-applying mechanism 4' simultaneously compress the paper cup. The linear guides ensure more precise and stable movement without deformation. The cooperation between the linear guides and the forward and reverse threaded ball screws guarantees that the pressure-applying mechanism (such as the probe) always moves along the central axis, avoiding uneven loading or tilting caused by unilateral force and jamming or deformation caused by traditional sliding friction, further ensuring high accuracy and repeatability of the test. Both ends of the forward and reverse threaded ball screws are rigidly fixed to the bottom of the test platform by fixing plates, improving transmission stability.

[0038] When using, such as Figure 5 As shown, the total height h of the paper cup is usually measured first with calipers, and 2 / 3 of the height is calculated and marked with a marker. Then, a three-jaw self-centering chuck 2 is used as the centering device for the paper cup. After the paper cup is fixed, the three-jaw self-centering chuck 2 and the paper cup on it are adjusted by the screw jack 3 until the pressure applying mechanisms (its probes) on both sides of the paper cup are aligned with the marked positions (i.e., the direction pointed to by F in the figure). This ensures that the pressure applying mechanisms (its probes) on both sides of the paper cup apply force in the diameter direction of the paper cup, and that the two side walls of the paper cup are simultaneously and evenly stressed. Furthermore, the deviation of the common axis of the pressure applying mechanisms (its probes) on both sides of the paper cup from the center line of the paper cup does not exceed 0.2mm. When testing paper cups of the same specification, only one manual height adjustment is needed, and subsequent tests of samples of different specifications of the same specification can be performed automatically. Finally, the driving mechanism enables the pressure mechanisms on both sides of the three-jaw self-centering chuck to apply force uniformly to the paper cup along the diameter direction at a relative speed of 50.0 mm / min ± 2.5 mm / min. The maximum force when the total deformation of the paper cup sidewall reaches 9.5 mm ± 0.5 mm is taken as the stiffness of the paper cup body. The accuracy of the obtained stiffness value is not less than ±1%, which meets the requirements of GB / T 27590.

[0039] This embodiment optimizes the paper cup fixing, lifting, guiding, and driving structure to achieve high-precision paper cup stiffness measurement, improving the accuracy, stability, and ease of operation of cup stiffness measurement. It solves the measurement inaccuracies caused by fixed eccentricity, transmission vibration, and guiding deviation in traditional stiffness measuring instruments. It is suitable for high-precision paper cup quality inspection (such as GB / T27590), while also considering efficiency and durability. Because this embodiment only requires manual height adjustment once when testing paper cups of the same specification, subsequent automatic testing of different samples of the same specification can be performed, shortening the single test cycle to 10-15 seconds. In contrast, traditional manual testing typically takes 60-90 seconds per test. Therefore, the testing instrument in this embodiment increases testing efficiency by approximately 6 times, offering the advantages of improved testing efficiency while reducing labor costs and human error.

[0040] As a second embodiment of this utility model, such as Figure 1 As shown, the left pressure mechanism 4 includes a left test rod 41 and a left connecting rod 43; the probe of the left test rod 41 is horizontally oriented towards the three-jaw self-centering chuck 2, and the left test rod 41 is connected to the top of the left connecting rod 43. The lower front end of the left connecting rod 43 is connected to the left-hand nut 81 of the positive and negative tooth ball screw 8, and the lower rear end of the left connecting rod 43 is connected to the left linear guide 6.

[0041] The right pressure mechanism 4' includes a right test rod 41', a high-progression micro force sensor 42, and a right connecting rod 43'. The probe of the right test rod 41' is horizontally oriented towards the three-jaw self-centering chuck 2, and the right test rod 41' is connected to the force-bearing end of the high-progression micro force sensor 42. The fixed end of the high-progression micro force sensor 42 is connected to the top of the right connecting rod 43'. The lower front end of the right connecting rod 43' is connected to the right-hand nut 81' of the positive and negative tooth ball screw 8, and the lower rear end of the right connecting rod 43' is connected to the right linear guide 6'.

[0042] Left connecting rod 43 and right connecting rod 43' are symmetrically and vertically mounted on both sides of the three-jaw self-centering chuck 2, with the axes of left test rod 41 and right test rod 41' radially opposite each other. When left connecting rod 43 and right connecting rod 43' move synchronously towards each other and the probes of left test rod 41 and right test rod 41' synchronously press against the side wall of the paper cup, the high-precision micro force sensor 42 begins to record the force value to obtain a high-precision paper cup stiffness value. Preferably, the probes of left test rod 41 and right test rod 41' are spherical to form a spherical contact between the probe and the side wall of the paper cup, with a spherical radius of 5mm.

[0043] In this embodiment, the left and right connecting rods move synchronously toward or away from the three-jaw self-centering chuck via positive and negative toothed ball screws and left and right linear guides. This ensures that the probes of the left and right test rods always move along the central axis, improving the stability of movement and avoiding eccentric loading or tilting caused by unilateral force, thereby improving the accuracy of the test.

[0044] As a third embodiment of this utility model, such as Figure 3 and 4 As shown, a left rectangular hole 11 and a right rectangular hole 11' are symmetrically provided on the test platform 1. The left connecting rod 43 passes through the left rectangular hole 11, and the right connecting rod 43' passes through the right rectangular hole 11', so as to limit the travel distance when the left connecting rod 43 and the right connecting rod 43' move synchronously.

[0045] In this embodiment, the forward and reverse rotation of the forward and reverse toothed ball screw 8 drives the left connecting rod 43 and the right connecting rod 43' to move synchronously in opposite directions within their respective left and right rectangular holes. This limits the synchronous displacement range of the right and left connecting rods (e.g., a standard test stroke of 9.5 mm), ensuring consistency in the stroke for each test and improving test accuracy. Preferably, the lengths of the left rectangular hole 11 and the right rectangular hole 11' are set such that the left connecting rod 43 and the right connecting rod 43' move synchronously until the total deformation of the paper cup sidewall squeezed by the left test rod 41 and the right test rod 41' reaches 9.5 mm ± 0.5 mm, in accordance with the requirements of GB / T 27590.

[0046] Furthermore, such as Figure 3 As shown, inductive switches A44 and B44' are provided at both ends of the length of the right rectangular hole 11', facing the right connecting rod 43', to limit the maximum travel distance of the right connecting rod 43' and the left connecting rod 43' during synchronous movement, so as to avoid overshoot. Preferably, the position of inductive switch B is set so that the left connecting rod 43 and the right connecting rod 43' move synchronously until the total deformation of the paper cup sidewall squeezed by the left test rod 41 and the right test rod 41' reaches 9.5mm ± 0.5mm, in order to meet the requirements of GB / T27590.

[0047] As a fourth embodiment of this utility model, such as Figure 2 and 4 As shown, the lower rear end of the left connecting rod 43 is connected to the vertical surface of the left connecting reinforcement seat 61, and the horizontal surface of the left connecting reinforcement seat 61 is connected to the slider of the left linear guide rail 6. The lower rear end of the right connecting rod 43' is connected to the vertical surface of the right connecting reinforcement seat 61', and the horizontal surface of the right connecting reinforcement seat 61' is connected to the slider of the right linear guide rail 6'. The left connecting reinforcement seat 61 and the right connecting reinforcement seat 61' enhance the rigidity and guiding accuracy of the movement of the left connecting rod 43 and the right connecting rod 43'.

[0048] As a fifth embodiment of this utility model, such as Figure 2As shown, the drive mechanism 5 includes a servo motor 51, a planetary reducer 52, a first sprocket 53, a second sprocket 54, and a chain 55. The output end of the servo motor 51 is connected to the input end of the planetary reducer 52, which is fixedly connected to the left side of the second fixed plate 12'. The output end of the planetary reducer 52 passes through the second fixed plate 12' and is coaxially connected to the first sprocket 53. The first sprocket 53 and the second sprocket 54 are connected by a chain 55. The right end of the forward and reverse thread ball screw 8 passes through the second fixed plate 12' and is coaxially connected to the second sprocket 54. The servo motor 51 drives the forward and reverse thread ball screw 8 to rotate in either direction via the planetary reducer 52, thereby achieving high-precision synchronous pressure application. In this embodiment, a servo motor and a planetary reducer are used in conjunction with forward and reverse thread ball screws to achieve high-precision, low-vibration transmission, improve the control accuracy of test speed and displacement (e.g., ±0.02mm), and extend the service life of the equipment.

[0049] As a sixth embodiment of this utility model, such as Figure 2 As shown, expansion sleeves 56 are installed between the output end of the planetary reducer 52 and the inner hole of the first sprocket 53, and between the positive and negative toothed ball screw 8 and the inner hole of the second sprocket 54, to eliminate transmission gaps and improve transmission accuracy, ensure the stability of the movement of the left and right connecting rods, and thus improve test accuracy.

[0050] As a seventh embodiment of this utility model, such as Figure 3 As shown, the three-jaw self-centering chuck 2 has three jaws. The three jaws are manually adjusted by a ratchet wrench to precisely position the paper cup on the test axis. In this embodiment, the three-jaw self-centering chuck achieves manual adjustment of the jaw opening and closing through a ratchet wrench. The torque scale function of the ratchet wrench can quantify and adjust the clamping force, which is more suitable for clamping paper cups and avoids the excessive tightness or looseness caused by traditional handle operation.

[0051] As the eighth embodiment of this utility model, such as Figure 1 As shown, a control device 7 is also provided on the test platform 1. The control device 7 contains a controller, and a touch screen 71 is located on the upper front side of the control device 7. The controller is electrically and signal-connected to the servo motor 51 of the drive mechanism 5, the high-precision micro force sensor 42, and the touch screen 71. The controller controls the servo motor 51 to operate via signals from the touch screen 71, and processes the force values ​​recorded by the high-precision micro force sensor 42 to obtain the paper cup stiffness value, which is then displayed on the touch screen 71.

[0052] In this embodiment, the controller can be a microcontroller or a PLC controller. The controller starts the servo motor based on the input from the touchscreen, thereby synchronously moving the left and right test rods towards and squeezing the paper cup. The high-precision micro force sensor obtains the force value and displays it on the touchscreen. After obtaining the test result according to the test standard, the controller automatically stops the servo motor, achieving automated control. The high-precision micro force sensor records the force value, and the controller typically uses an embedded microcontroller (MCU) or programmable logic controller (PLC) to process the force value to obtain the cup's stiffness value, which is displayed on a high-resolution touchscreen 71, achieving a display resolution of not less than 0.01N, conforming to the requirements of GB / T27590.

[0053] As the ninth embodiment of this utility model, such as Figure 1 As shown, an emergency stop switch 73 is provided on the lower front side of the control device 7. The emergency stop switch 73 is electrically and signal connected to the controller, so that the controller can control the power switch to cut off the power supply through the signal from the emergency stop switch 73. In this embodiment, the emergency stop switch is designed to quickly cut off the power in an emergency, thus protecting the test instrument.

[0054] As the tenth embodiment of this utility model, such as Figure 1 As shown, a printer 72 is located on the external right side of the control device 7. The printer 72 is electrically and signal-connected to the controller, so that the controller can control the printer 72 to print test results through the operation of the touch screen 71.

[0055] It should be stated that the above-described utility model content and specific embodiments are intended to demonstrate the practical application of the technical solution provided by this utility model, and should not be construed as limiting the scope of protection of this utility model. Those skilled in the art can make various modifications, equivalent substitutions, or improvements within the spirit and principles of this utility model. The scope of protection of this utility model is determined by the appended claims.

Claims

1. A high precision paper cup stiffness tester characterized by, The high-precision paper cup hardness tester comprises a test platform (1), a three-jaw self-centering chuck (2), a screw rod elevator (3), a left pressing mechanism (4), a right pressing mechanism (4'), a driving mechanism (5), a left linear guide rail (6) and a right linear guide rail (6'); wherein, The three-jaw self-centering chuck (2) is arranged above the test platform (1) to fix the paper cup on the test axis; The screw rod elevator (3) is fixedly connected below the test platform (1), and the screw rod elevator (3) is coaxially connected to the bottom of the three-jaw self-centering chuck (2) through a screw rod (31); the bottom of the screw rod elevator (3) is connected with a guide seat (32); the input shaft end of the screw rod elevator (3) is connected with an adjusting hand wheel (33); the three-jaw self-centering chuck (2) and the paper cup clamped thereon are driven by rotating the adjusting hand wheel (33) to realize high-precision vertical up-and-down movement, so as to adjust the test point of the pressing to the 2 / 3 position of the paper cup; The left pressing mechanism (4) and the right pressing mechanism (4') are symmetrically arranged on the two sides of the three-jaw self-centering chuck (2); the lower front end of the left pressing mechanism (4) is connected to the left screw nut (81) of the positive and negative tooth ball screw (8); the lower front end of the right pressing mechanism (4') is connected to the right screw nut (81') of the positive and negative tooth ball screw (8); the left end and the right end of the positive and negative tooth ball screw (8) are connected below the test platform (1) through a first fixed plate (12) and a second fixed plate (12'), respectively; the right end of the positive and negative tooth ball screw (8) is connected with the driving mechanism (5); the lower rear end of the left pressing mechanism (4) is connected with the left linear guide rail (6); the lower rear end of the right pressing mechanism (4') is connected with the right linear guide rail (6'); the left linear guide rail (6) and the right linear guide rail (6') are fixedly connected to the bottom surface of the test platform (1); when the driving mechanism (5) drives the positive and negative tooth ball screw (8) to rotate forward or reversely, the two pressing mechanisms realize high-precision synchronous linear movement in the same direction or in the opposite direction through the positive and negative tooth ball screw (8) and the two linear guide rails, so as to obtain a high-precision paper cup stiffness value when the left pressing mechanism (4) and the right pressing mechanism (4') synchronously press the paper cup.

2. The high-precision paper cup hardness tester according to claim 1, wherein, The left pressing mechanism (4) comprises a left test rod (41) and a left connecting rod (43); the measuring head of the left test rod (41) is horizontally directed towards the direction of the three-jaw self-centering chuck (2); the left test rod (41) is connected to the top of the left connecting rod (43); the lower front end of the left connecting rod (43) is connected to the left screw nut (81) of the positive and negative tooth ball screw (8); and the lower rear end of the left connecting rod (43) is connected with the left linear guide rail (6). The right pressing mechanism (4') comprises a right test rod (41'), a high-precision miniature force sensor (42) and a right connecting rod (43'); the measuring head of the right test rod (41') is horizontally directed towards the three-jaw self-centering chuck (2), and the right test rod (41') is connected to the force receiving end of the high-precision miniature force sensor (42); the fixed end of the high-precision miniature force sensor (42) is connected to the top of the right connecting rod (43'); the lower front end of the right connecting rod (43') is connected to the right-hand nut (81') of the positive and negative toothed ball screw (8); and the lower rear end of the right connecting rod (43') is connected to the right linear guide rail (6'). The left connecting rod (43) and the right connecting rod (43') are symmetrically and perpendicularly arranged on the two sides of the three-jaw self-centering chuck (2); the axes of the left test rod (41) and the right test rod (41') are radially opposite, so that the left connecting rod (43) and the right connecting rod (43') move synchronously towards each other, and the measuring heads of the left test rod (41) and the right test rod (41') synchronously press the side wall of the paper cup, and the high-precision miniature force sensor (42) starts to record the force value to obtain a high-precision paper cup stiffness value.

3. The high precision paper cup stiffness tester of claim 2, wherein, The testing platform (1) is symmetrically provided with a left rectangular hole (11) and a right rectangular hole (11'), the left connecting rod (43) is arranged in the left rectangular hole (11), and the right connecting rod (43') is arranged in the right rectangular hole (11'), so as to limit the walking distance of the left connecting rod (43) and the right connecting rod (43') when they move synchronously.

4. The high precision paper cup stiffness tester of claim 2, wherein, The lower rear end of the left connecting rod (43) is connected to the vertical surface of the left connecting reinforcing seat (61), and the horizontal surface of the left connecting reinforcing seat (61) is connected to the slider of the left linear guide rail (6); the lower rear end of the right connecting rod (43') is connected to the vertical surface of the right connecting reinforcing seat (61'), and the horizontal surface of the right connecting reinforcing seat (61') is connected to the slider of the right linear guide rail (6'), so as to enhance the rigidity and guiding accuracy of the left connecting rod (43) and the right connecting rod (43') through the left connecting reinforcing seat (61) and the right connecting reinforcing seat (61').

5. The high precision paper cup stiffness tester of claim 1, wherein, The driving mechanism (5) comprises a servo motor (51), a planetary reducer (52), a first sprocket (53), a second sprocket (54) and a chain (55); wherein, the output end of the servo motor (51) is connected to the input end of the planetary reducer (52), the planetary reducer (52) is fixedly connected to the left side of the second fixed plate (12'), the output end of the planetary reducer (52) is coaxially connected to the first sprocket (53) through the second fixed plate (12'), the first sprocket (53) and the second sprocket (54) are drivingly connected through the chain (55), and the right end of the positive and negative toothed ball screw (8) is coaxially connected to the second sprocket (54) through the second fixed plate (12'), so that the servo motor (51) drives the positive and negative toothed ball screw (8) to rotate in the forward or reverse direction through the planetary reducer (52), to realize high-precision synchronous pressing.

6. The high precision paper cup stiffness tester of claim 5, wherein, Expansion sleeves (56) are installed between the output end of the planetary reducer (52) and the inner hole of the first sprocket (53), and between the positive and negative toothed ball screw (8) and the inner hole of the second sprocket (54), to eliminate transmission clearance and improve transmission accuracy.

7. The high precision paper cup stiffness tester of claim 1, wherein, Three claws are arranged on the three-jaw self-centering chuck (2), and the three claws are manually adjusted to open and close through a ratchet wrench to accurately position the paper cup on the test axis.

8. The high precision paper cup stiffness tester of claim 1, wherein, The control device (7) is further arranged on the test platform (1), a controller is arranged in the control device (7), a touch screen (71) is arranged on the front upper side of the control device (7), the controller is electrically connected and signal connected with the servo motor (51) of the driving mechanism (5), the high-advance micro force sensor (42) of the pressure applying mechanism and the touch screen (71), so that the controller controls the servo motor (51) to work through the signal of the touch screen (71), and the stiffness value of the paper cup is obtained after the force value recorded by the high-advance micro force sensor (42) is processed, and the stiffness value is displayed on the touch screen (71).

9. The high precision paper cup stiffness tester of claim 8, wherein, An emergency stop switch (73) is arranged on the lower side of the front side of the control device (7), and the emergency stop switch (73) is electrically connected and signal connected with the controller, so that the controller controls the power switch to be cut off through the signal of the emergency stop switch (73).

10. The high precision paper cup stiffness tester of claim 8, wherein, A printer (72) is arranged on the right side of the control device (7), and the printer (72) is electrically connected and signal connected with the controller, so that the controller controls the printer (72) to print the test result through operation.

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