Automatic paper cup hardness tester

Abstract

The invention provides an automatic paper cup hardness tester which comprises a testing platform, a three-jaw self-centering chuck, a lifting mechanism, a pressure applying mechanism, a driving mechanism, a guide mechanism and a control mechanism, the three-jaw self-centering chuck is erected above the testing platform, the lifting mechanism is coaxially connected to the bottom of the three-jaw self-centering chuck through a screw, and the pressure applying mechanism is arranged on the bottom of the three-jaw self-centering chuck. The pressure applying mechanisms are symmetrically erected on the two sides of the three-jaw self-centering chuck, the front ends of the lower portions of the pressure applying mechanisms are connected to the forward and reverse thread ball screws respectively, the right ends of the forward and reverse thread ball screws are connected with the driving mechanism, the rear ends of the lower portions of the pressure applying mechanisms are correspondingly connected with the guide mechanisms respectively, and the control mechanism comprises a controller and a touch screen. And the controller is respectively in electric connection and signal connection with the touch screen, the driving mechanism and the pressure applying mechanism. By optimizing the paper cup fixing and lifting mechanism and the driving and guiding mechanism, the stability and accuracy of paper cup stiffness testing are improved, and automatic control over paper cup stiffness testing is achieved through the control mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of paper cup testing instruments, and more particularly to an automated paper cup hardness tester. Background Art

[0002] In the quality inspection of paper cup production, stiffness (or hardness) is an important indicator to measure the anti-deformation ability of the side wall of the paper cup, which directly affects the use performance of the paper cup (such as hand-held stability, compressive strength, etc.). At present, the stiffness test of paper cups usually uses mechanical or semi-automatic test equipment, lacking precise control over the moving speed, pressing position and force of the test rod, resulting in insufficient reliability of the test results. Therefore, there is an urgent need for an automated and high-precision paper cup hardness tester. Summary of the Invention

[0003] In order to solve the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide an automated paper cup hardness tester to overcome the defects in the prior art.

[0004] To achieve the above purpose, the present invention provides an automated paper cup hardness tester, including a test platform, a three-jaw self-centering chuck, a lifting mechanism, a pressing mechanism, a driving mechanism, a guiding mechanism and a control mechanism; wherein,

[0005] The three-jaw self-centering chuck is erected above the test platform to fix the paper cup on the test axis;

[0006] The lifting mechanism is fixedly connected below the test platform, and the lifting mechanism is coaxially connected to the bottom of the three-jaw self-centering chuck through a screw rod, so that the lifting mechanism drives the screw rod to drive the three-jaw self-centering chuck and the paper cup fixed thereon to move up and down, thereby adjusting the test point of the pressing mechanism to the 2 / 3 position of the paper cup.

[0007] The pressing mechanism is symmetrically erected on both sides of the three-jaw self-centering chuck; the front ends of the bottom of the pressing mechanism are respectively connected to the left and right hand threads ball screw, the left end and the right end of the left and right hand threads ball screw are respectively connected to the bottom of the test platform through a first fixing plate and a second fixing plate, and the right end of the left and right hand threads ball screw is connected to the driving mechanism; the rear ends of the bottom of the pressing mechanism are respectively connected to the guiding mechanism correspondingly, and the guiding mechanism is fixedly connected to the bottom surface of the test platform, so that the driving mechanism drives the left and right hand threads ball screw to rotate, and then the pressing mechanism moves synchronously along the left and right hand threads ball screw and the guiding mechanism.

[0008] The control mechanism includes a controller and a touch screen, and the controller is electrically connected and signal-connected to the touch screen, the driving mechanism and the pressing mechanism respectively, so that the controller controls the driving mechanism to drive the pressing mechanism to move synchronously towards the three-jaw self-centering chuck and the paper cup fixed thereon according to the signal of the touch screen, and the controller obtains the stiffness value of the paper cup when the pressing mechanism presses the paper cup.

[0009] Through the above technical solution, the paper cup is fixed on the test axis through a three-jaw self-centering chuck, improving the accuracy of paper cup positioning; the three-jaw self-centering chuck and the paper cup on it are driven by a lifting mechanism to move smoothly and vertically to adjust the test point of the pressing mechanism to the 2 / 3 position of the paper cup, improving the accuracy of test point adjustment and avoiding the deviation of test results caused by the change of the relative position between the pressing mechanism and the three-jaw self-centering chuck. Then, the control mechanism controls the driving mechanism to drive the left and right-handed ball screw to rotate, so that the pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously towards the three-jaw self-centering chuck and the paper cup fixed on it. When the pressing mechanism squeezes the paper cup, the stiffness value of the paper cup can be obtained, thus realizing the automatic control of the paper cup stiffness test. The pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously through the left and right-handed ball screw, avoiding the problem of uneven force caused by unilateral pressing and ensuring the accuracy and repeatability of test data; the movement of the pressing mechanism is guided by the left and right-handed ball screw and the guiding mechanism together, ensuring the stability of the movement of the pressing mechanism and improving the accuracy of the movement of the pressing mechanism.

[0010] As a further description of the automatic paper cup hardness tester of the present invention, preferably, the pressing mechanism includes two test rods, a high-precision micro force sensor and two connecting rods; wherein, the left connecting rod and the right connecting rod are symmetrically arranged on both sides of the three-jaw self-centering chuck. The top of the left connecting rod is connected to the left test rod, the top of the right connecting rod is connected to the fixed end of the high-precision micro force sensor, the force-receiving end of the high-precision micro force sensor is connected to the right test rod, and the probes of the left test rod and the right test rod are both horizontally oriented towards the three-jaw self-centering chuck; the high-precision micro force sensor is electrically connected and signal-connected to the controller of the control mechanism; on the left and right-handed ball screw, there are symmetrically arranged a left thread section and a right thread section with the same lead and opposite helix directions. A left ball nut is connected to the left thread section, and a right ball nut is connected to the right thread section; the front end of the bottom of the left connecting rod is fixedly connected to the left ball nut, and the front end of the bottom of the right connecting rod is fixedly connected to the right ball nut, so that when the left and right-handed ball screw rotates forward or backward, the left connecting rod and the right connecting rod move synchronously towards or away from the three-jaw self-centering chuck. When the probes of the left test rod and the right test rod simultaneously squeeze the side wall of the paper cup, the high-precision micro force sensor starts to record the force value and transmits it to the controller of the control mechanism.

[0011] Through the above technical solution, the left connecting rod and the right connecting rod of the pressing mechanism move synchronously towards or away from the three-jaw self-centering chuck through the left and right-handed ball screw, ensuring that the probes of the left test rod and the right test rod always move along the central axis, improving the stability of the movement and avoiding the eccentric load or inclination caused by unilateral force, thereby improving the accuracy of the test.

[0012] As a further description of the automated paper cup hardness tester of the present invention, preferably, a left rectangular hole and a right rectangular hole are symmetrically provided on the test platform. The left connecting rod passes through the left rectangular hole, and the right connecting rod passes through the right rectangular hole, so that the upper parts of the left connecting rod and the right connecting rod are above the test platform, and the lower parts of the left connecting rod and the right connecting rod are below the test platform; an induction switch A and an induction switch B facing the right connecting rod are provided at both ends of the outer edge of the right rectangular hole along the length of the right rectangular hole; the induction switch A and the induction switch B are respectively electrically connected and signal-connected to the controller of the control mechanism, so that the controller controls the driving mechanism to drive the left test rod and the right test rod to move synchronously away from the three-jaw self-centering chuck and the paper cup fixed thereon according to the induction signal of the induction switch B, and the controller controls the driving mechanism to stop according to the induction signal of the induction switch A.

[0013] Through the above technical solution, through the trigger signals of the induction switch A and the induction switch B, the synchronous displacement range of the right connecting rod and the left connecting rod can be strictly limited (such as the standard test stroke of 9.5 mm), preventing the probe of the detection rod from exceeding the set distance due to mechanical overshoot or program error, ensuring the stroke consistency of each test, and improving the test accuracy.

[0014] As a further description of the automated paper cup hardness tester of the present invention, preferably, the driving mechanism includes a servo motor, a planetary reducer, a first sprocket, a second sprocket and a chain; wherein, the control end of the servo motor is electrically connected and signal-connected to the controller, 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 fixing plate, the output end of the planetary reducer passes through the second fixing 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 left-right thread ball screw passes through the second fixing plate and is coaxially connected to the second sprocket, so that the controller controls the servo motor, and then drives the left-right thread ball screw to rotate forward or backward.

[0015] Through the above technical solution, the driving mechanism uses a servo motor and a planetary reducer to cooperate to drive the left-right thread ball screw to rotate forward and backward, realizing high-precision and low-vibration transmission, improving the control accuracy and stability of the synchronous movement of the left connecting rod and the right connecting rod, and at the same time extending the service life of the equipment.

[0016] As a further illustration of the automated paper cup hardness tester of the present invention, preferably, the guiding mechanism includes two linear guide rails and two connecting and strengthening seats; wherein, the left linear guide rail and the right linear guide rail are respectively fixedly connected to the bottom surface of the test platform relative to the left connecting rod and the right connecting rod of the pressing mechanism; the horizontal plane of the left connecting and strengthening seat is connected to the left linear guide rail, the vertical plane of the left connecting and strengthening seat is connected to the rear end of the bottom of the left connecting rod, the horizontal plane of the right connecting and strengthening seat is connected to the right linear guide rail, and the vertical plane of the right connecting and strengthening seat is connected to the rear end of the bottom of the right connecting rod, so that the left connecting rod and the right connecting rod of the pressing mechanism respectively move synchronously along the corresponding left linear guide rail and right linear guide rail in the direction of approaching or departing from the three-jaw self-centering chuck.

[0017] Through the above technical solution, the guiding mechanism adopts the left linear guide rail and the right linear guide rail to guide the movement of the left connecting rod and the right connecting rod, ensuring the smooth and non-offset movement of the left connecting rod and the right connecting rod, and they will not deform, avoiding the jamming or deformation problems caused by traditional sliding friction, further ensuring the test repeatability and improving the accuracy of the test results.

[0018] As a further illustration of the automated paper cup hardness tester of the present invention, preferably, the lifting mechanism includes a screw jack, a guiding seat and an adjusting handwheel; wherein, the guiding seat is connected to the bottom of the screw jack, the top of the screw jack is fixedly connected to the bottom surface of the test platform, and the adjusting handwheel is connected to the input shaft end of the screw jack; a circular hole is provided on the test platform, and one end of the screw passes through the guiding seat, the screw jack and the circular hole and is connected to the bottom of the three-jaw self-centering chuck, so that by rotating the adjusting handwheel, the screw is driven to drive the three-jaw self-centering chuck and the paper cup clamped thereon to move up and down.

[0019] Through the above technical solution, the lifting mechanism adopts a screw jack, and by rotating the adjusting handwheel, the three-jaw self-centering chuck and the paper cup clamped thereon move up and down, ensuring the smooth lifting and verticality of the three-jaw self-centering chuck and the paper cup clamped thereon, improving the test accuracy, and making the operation easier.

[0020] As a further illustration of the automated paper cup hardness tester of the present invention, 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.

[0021] Through the above technical solution, the three-jaw self-centering chuck realizes the manual adjustment of the jaw opening and closing by 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 being too tight or too loose caused by the operation of the traditional handle.

[0022] As a further description of the automated paper cup hardness tester of the present invention, preferably, the control mechanism further includes a printer, and the printer is electrically connected and signal-connected to the controller, so that the controller controls the printer to print the test results through the operation of the touch screen.

[0023] As a further description of the automated paper cup hardness tester of the present invention, preferably, the control mechanism further includes an emergency stop switch, and the emergency stop switch is electrically connected and signal-connected to the controller, so that the controller controls the power switch to be cut off through the signal of the emergency stop switch.

[0024] Through the above technical solution, by setting an emergency stop switch, it can quickly cut off the power in case of emergency to protect the tester.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1. The present invention uses a three-jaw self-centering chuck to fix the paper cup on the test axis, ensuring that the center of the paper cup is strictly aligned with the detection axis, effectively reducing the eccentricity error, improving the accuracy of paper cup positioning, and avoiding the offset problem that may be caused by the traditional tray structure.

[0027] 2. The present invention drives the three-jaw self-centering chuck and the paper cup on it to lift smoothly and vertically through the lifting mechanism to adjust the test point of the pressing mechanism to the 2 / 3 position of the paper cup, improving the accuracy of test point adjustment and avoiding the deviation of test results caused by the change of the relative position between the pressing mechanism and the three-jaw self-centering chuck.

[0028] 3. The present invention controls the driving mechanism to drive the left-handed and right-handed ball screw to rotate through the control mechanism, so that the pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously towards the three-jaw self-centering chuck and the paper cup fixed on it, and the stiffness value of the paper cup can be obtained when the pressing mechanism squeezes the paper cup, thereby realizing the automatic control of the paper cup stiffness test.

[0029] 4. In the present invention, the pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously through the left-handed and right-handed ball screw, avoiding the problem of uneven force caused by single-sided pressing, ensuring the accuracy and repeatability of test data; the movement of the pressing mechanism is guided by the left-handed and right-handed ball screw and the guiding mechanism together, ensuring the stability of the movement of the pressing mechanism and improving the accuracy of the movement of the pressing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic external structure diagram of the automated paper cup hardness tester of the present invention;

[0031] Figure 2 is a schematic internal structure diagram of the automated paper cup hardness tester of the present invention;

[0032] Figure 3Schematic diagram of the top surface of the test platform of the automatic paper cup hardness tester of the present invention;

[0033] Figure 4 Schematic diagram of the bottom surface of the test platform of the automatic paper cup hardness tester of the present invention;

[0034] Figure 5 Block diagram of the control mechanism of the present invention;

[0035] Figure 6 Schematic diagram of the method for testing the stiffness of paper cups. Specific embodiments

[0036] In order to further understand the structure, features and other purposes of the present invention, the following is a detailed description with reference to the attached preferred embodiments and accompanying drawings. The embodiments described by the drawings are only used to illustrate the technical solutions of the present invention and do not limit the present invention.

[0037] As the first embodiment of the present invention, as shown in Figure 1 、 2 and 5, it includes a test platform 1, a three-jaw self-centering chuck 2, a lifting mechanism 3, a pressing mechanism 4 and 4', a driving mechanism 5, a guiding mechanism 6 and 6' and a control mechanism 7.

[0038] The three-jaw self-centering chuck 2 is installed above the test platform 1, and the three-jaw self-centering chuck 2 is used to fix the paper cup on the test axis. The three-jaw self-centering chuck is used to fix the paper cup on the test axis, ensuring that the center of the paper cup is strictly aligned with the test axis, effectively reducing the eccentric error, improving the accuracy of paper cup positioning, and avoiding the offset problem that may be caused by the traditional tray structure.

[0039] The lifting mechanism 3 is fixedly connected to the lower part of the test platform 1, and the lifting mechanism 3 is coaxially connected to the bottom of the three-jaw self-centering chuck 2 through a screw 34. The lifting mechanism 3 is used to drive the screw 34 to drive the three-jaw self-centering chuck 2 and the paper cup fixed thereon to move up and down, thereby adjusting the test points of the pressing mechanism 4 and 4' to the 2 / 3 position of the paper cup. By driving the three-jaw self-centering chuck and the paper cup thereon to lift smoothly and vertically through the lifting mechanism, the test points of the pressing mechanism are adjusted to the 2 / 3 position of the paper cup, improving the accuracy of test point adjustment and avoiding the deviation of test results caused by the change of the relative position between the pressing mechanism and the three-jaw self-centering chuck.

[0040] The pressing mechanisms 4 and 4' are symmetrically mounted on both sides of the three-jaw self-centering chuck 2. Among them, the front ends of the bottoms of the pressing mechanisms 4 and 4' are respectively connected to the left-right hand ball screw 8. The left end and the right end of the left-right hand ball screw 8 are respectively connected to the lower part of the test platform 1 through the first fixing plate 12 and the second fixing plate 12'. The right end of the left-right hand ball screw 8 is connected to the driving mechanism 5. The rear ends of the bottoms of the pressing mechanisms 4 and 4' are respectively connected to the corresponding guiding mechanisms 6 and 6'. The guiding mechanisms 6 and 6' are fixedly connected to the bottom surface of the test platform 1.

[0041] The driving mechanism 5 is used to drive the left-right hand ball screw 8 to rotate, so as to make the pressing mechanisms 4 and 4' move synchronously along the left-right hand ball screw 8 and the corresponding guiding mechanisms 6 and 6'. That is, the pressing mechanism 4 moves along the left-right hand ball screw 8 and the guiding mechanism 6, and the pressing mechanism 4' moves along the left-right hand ball screw 8 and the guiding mechanism 6'. The movement of the pressing mechanism is jointly guided by the left-right hand ball screw and the guiding mechanism, which ensures the stability of the movement of the pressing mechanism and improves the accuracy of the movement of the pressing mechanism. The pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously through the left-right hand ball screw, which also avoids the problem of uneven force caused by single-sided pressing and ensures the accuracy and repeatability of the test data.

[0042] The control mechanism 7 includes a controller 74 and a touch screen 71. The controller 74 is electrically connected and signal-connected to the touch screen 71, the driving mechanism 5, and the pressing mechanisms 4 and 4'. The controller 74 controls the driving mechanism 5 to drive the pressing mechanisms 4 and 4' to move synchronously towards the three-jaw self-centering chuck 2 and the paper cup fixed thereon according to the signal of the touch screen 71. And the controller 74 obtains the stiffness value of the paper cup when the pressing mechanisms 4 and 4' squeeze the paper cup, realizing the automatic control of the paper cup stiffness detection.

[0043] In this embodiment, the control mechanism controls the driving mechanism to drive the left-right hand ball screw to rotate, so that the pressing mechanisms on both sides of the three-jaw self-centering chuck move synchronously towards the three-jaw self-centering chuck and the paper cup fixed thereon. When the pressing mechanisms squeeze the paper cup, the stiffness value of the paper cup can be obtained, thereby realizing the automatic control of the paper cup stiffness test.

[0044] When in use, such as Figure 6As shown in the figure, usually first use a caliper to measure the total height h of the paper cup, calculate 2 / 3 of its height and mark it with a marker pen. Then, the three-jaw self-centering chuck 2 is used as a device for centering the paper cup. After the paper cup is fixed, the three-jaw self-centering chuck 2 and the paper cup on it are adjusted up and down by the lifting mechanism 3 until the pressure-applying mechanisms (their probes) on both sides of the paper cup are opposite to the marked position (i.e., the direction pointed by F in the figure). In this way, the pressure-applying mechanisms (their probes) on both sides of the paper cup can apply force in the diameter direction of the paper cup, and the two side walls of the paper cup can be evenly stressed at the same time. And the offset of the common axis of the pressure-applying mechanisms (their probes) on both sides of the paper cup from the center line of the paper cup does not exceed the standard of 0.2 mm. When testing paper cups of the same specification, only need to manually adjust the height once, and then subsequent automatic testing of different samples of the same specification can be carried out. Finally, through the drive of the drive mechanism, the pressure-applying mechanisms on both sides of the three-jaw self-centering chuck can apply force to the paper cup evenly along the diameter direction of the paper cup at a relative speed of 50.0 mm / min ± 2.5 mm / min. The maximum force received when the total deformation of the side wall of the paper cup reaches 9.5 mm ± 0.5 mm is used as the body stiffness of the paper cup, and the obtained body stiffness value accuracy is not less than ±1%, meeting the requirements of GB / T 27590.

[0045] Since when testing paper cups of the same specification in the present invention, only need to manually adjust the height once, and then subsequent automatic testing of different samples of the same specification can be carried out, the single test cycle can be shortened to 10 - 15 seconds, while the traditional manual test generally takes 60 - 90 seconds for a single test. Therefore, the tester of the present invention improves the test efficiency by about 6 times, having the advantages of improving the test efficiency, reducing the labor cost and human error at the same time.

[0046] As the second embodiment of the present invention, as Figure 2 、 3 shown in FIG. 4, the pressure-applying mechanisms 4 and 4' include two test rods 41 and 41', high-precision micro force sensors 42, and two connecting rods 43 and 43'. Among them, the left connecting rod 43 and the right connecting rod 43' are symmetrically arranged on both sides of the three-jaw self-centering chuck 2. The top of the left connecting rod 43 is connected to the left test rod 41. The top of the right connecting rod 43' is connected to the fixed end of the high-precision micro force sensor 42, and the force-receiving end of the high-precision micro force sensor 42 is connected to the right test rod 41'. The probes of the left test rod 41 and the right test rod 41' are both horizontally oriented towards the three-jaw self-centering chuck 2. The high-precision micro force sensor 42 is electrically connected and signal-connected to the controller 74 of the control mechanism 7. Preferably, the probes of the left test rod 41 and the right test rod 41' are spherical surfaces, so that the probes form a spherical contact with the side wall of the paper cup, and the spherical radius is 5 mm.

[0047] On the left - hand and right - hand lead ball screw 8, there are symmetrically arranged a left - hand thread section and a right - hand thread section with the same lead and opposite helix directions. A left - hand ball nut 81 is connected to the left - hand thread section, and a right - hand ball nut 81' is connected to the right - hand thread section. The front end of the bottom of the left connecting rod 43 is fixedly connected to the left - hand ball nut 81, and the front end of the bottom of the right connecting rod 43' is fixedly connected to the right - hand ball nut 81'. When the left - hand and right - hand lead ball screw 8 rotates forward or backward, the left connecting rod 43 and the right connecting rod 43' move synchronously in the direction of approaching or moving away from the three - jaw self - centering chuck 2. When the probes of the left test rod 41 and the right test rod 41' synchronously press the side wall of the paper cup, the high - precision micro - force sensor 42 starts to record the force value and transmits it to the controller 74 of the control mechanism 7. Then, the controller 74 controls the display of the stiffness value of the paper cup on the touch screen 71.

[0048] In this embodiment, the left connecting rod 43 and the right connecting rod 43' of the pressing mechanism are synchronously moved in the direction of approaching or moving away from the three - jaw self - centering chuck 2 through the left - hand and right - hand lead ball screw 8, ensuring that the probes of the left test rod 41 and the right test rod 41' always move along the central axis, improving the stability of the movement, and avoiding eccentric loading or tilting caused by unilateral force, thereby improving the accuracy of the test. The high - precision micro - force sensor is used to record the force value, and the controller 74 usually uses an embedded micro - controller (MCU) or a programmable logic controller (PLC) to process the force value to obtain the stiffness value of the cup body, which is displayed by the touch screen 71 with a high display resolution, and can meet the standard that the display resolution is not less than 0.01N, meeting the requirements of GB / T 27590.

[0049] As the third embodiment of the present invention, as Figure 3 、 4 shown in Fig. 5, on the test platform 1, there are symmetrically arranged a left rectangular hole 11 and a right rectangular hole 11'. The left connecting rod 43 is inserted into the left rectangular hole 11, and the right connecting rod 43' is inserted into the right rectangular hole 11', so that the upper parts of the left connecting rod 43 and the right connecting rod 43' are above the test platform 1, and the lower parts of the left connecting rod 43 and the right connecting rod 43' are below the test platform 1.

[0050] At both ends of the outer edge of the right rectangular hole 11' along the length of the right rectangular hole 11', there are induction switches A44 and induction switch B44' facing the right connecting rod 43', which are used to limit the maximum travel distance of the synchronous movement of the right connecting rod 43' and the left connecting rod 43 to avoid overshoot. The left rectangular hole 11 and the right rectangular hole 11' also play a role in limiting the travel distance when the right connecting rod 43' and the left connecting rod 43 move. Preferably, the lengths of the left rectangular hole 11 and the right rectangular hole 11' are set so that when the left connecting rod 43 and the right connecting rod 43' move synchronously until the total deformation of the left test rod 41 and the right test rod 41' pressing the side wall of the paper cup reaches 9.5mm ± 0.5mm, to meet the requirements of GB / T27590.

[0051] The inductive switch A44 and the inductive switch B44' are electrically connected and signal-connected to the controller 74 of the control mechanism 7 respectively. The controller 74 controls the driving mechanism 5 to drive the left test rod 41 and the right test rod 41' to move synchronously away from the three-jaw self-centering chuck 2 and the paper cup fixed thereon according to the induction signal of the inductive switch B44'. The controller 74 controls the driving mechanism 5 to stop according to the induction signal of the inductive switch A44, realizing the automatic control of the driving mechanism 5. Preferably, the position of the inductive switch B is set such that the total deformation of the side wall of the paper cup when the left connecting rod 43 and the right connecting rod 43' move synchronously to squeeze the left test rod 41 and the right test rod 41' reaches 9.5 mm ± 0.5 mm, so as to meet the requirements of GB / T 27590.

[0052] In this embodiment, through the trigger signals of the inductive switch A and the inductive switch B, the synchronous displacement range of the right connecting rod and the left connecting rod can be strictly limited (such as the standard test stroke of 9.5 mm), preventing the probe of the detection rod from exceeding the set distance due to mechanical overshoot or program error, ensuring the consistency of the stroke of each test, and improving the test accuracy.

[0053] As the fourth embodiment of the present invention, as Figure 2 , 4 As shown in FIGS. 5, the driving mechanism 5 includes a servo motor 51, a planetary reducer 52, a first sprocket 53, a second sprocket 54, and a chain 55. The control end of the servo motor 51 is electrically connected and signal-connected to the controller 74. 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 fixing plate 12'. The output end of the planetary reducer 52 passes through the second fixing 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 positive and negative thread ball screw 8 passes through the second fixing plate 12' and is coaxially connected to the second sprocket 54. By controlling the servo motor 51 by the controller 74, the positive and negative thread ball screw 8 is driven to rotate forward or backward.

[0054] In this embodiment, the driving mechanism 5 uses the servo motor 51 and the planetary reducer 52 to cooperate to drive the positive and negative thread ball screw 8 to rotate forward and backward, realizing high-precision and low-vibration transmission, improving the control accuracy and stability of the synchronous movement of the left connecting rod 43 and the right connecting rod 43', and at the same time extending the service life of the equipment.

[0055] As the fifth embodiment of the present invention, as Figure 2 and 4As shown, the guiding mechanisms 6 and 6' include linear guide rails 61 and 61' and connecting reinforcing seats 62 and 62'. Among them, the left linear guide rail 61 and the right linear guide rail 61' are fixedly connected to the bottom surface of the test platform 1 relative to the left connecting rod 43 and the right connecting rod 43' of the pressing mechanisms 4 and 4' respectively. The horizontal plane of the left connecting reinforcing seat 62 is connected to the left linear guide rail 61, and the vertical plane of the left connecting reinforcing seat 62 is connected to the bottom rear end of the left connecting rod 33. The horizontal plane of the right connecting reinforcing seat 62' is connected to the right linear guide rail 61', and the vertical plane of the right connecting reinforcing seat 62' is connected to the bottom rear end of the right connecting rod 33'.

[0056] The left connecting rod 43 and the right connecting rod 43' of the pressing mechanisms 4 and 4' move synchronously along the corresponding left linear guide rail 61 and right linear guide rail 61' in the direction of approaching or departing from the three-jaw self-centering chuck 2. That is, the left connecting rod 43 moves along the left linear guide rail 61, and the right connecting rod 43' moves along the right linear guide rail 61', ensuring the stability of the movement of the left connecting rod 43 and the right connecting rod 43', and further improving the accuracy of the test results.

[0057] In this embodiment, the guiding mechanism adopts left and right linear guide rails to guide the movement of the left and right connecting rods, ensuring the smooth and non-offset movement of the left and right connecting rods, and they will not deform, avoiding the jamming or deformation problems caused by traditional sliding friction, further ensuring the test repeatability and improving the accuracy of the test results.

[0058] As the sixth embodiment of the present invention, as shown in Figure 2 and 4 shown, the lifting mechanism 3 includes a screw jack 31, a guiding seat 32 and an adjusting handwheel 33. Among them, the guiding seat 32 is connected to the bottom of the screw jack 31, the top of the screw jack 31 is fixedly connected to the bottom surface of the test platform 1, and the adjusting handwheel 33 is connected to the input shaft end of the screw jack 31.

[0059] There is a round hole on the test platform 1. One end of the screw rod 34 passes through the guiding seat 32, the screw jack 31 and the round hole and is connected to the bottom of the three-jaw self-centering chuck 2. By rotating the adjusting handwheel 33 to drive the screw rod 34 to drive the three-jaw self-centering chuck 2 and the paper cup clamped thereon to move up and down, the test point of the pressing mechanism 4 can be adjusted to the 2 / 3 position of the paper cup. When testing paper cups of the same specification, the height only needs to be manually adjusted once, and subsequent automatic tests of different samples of the same specification can be carried out.

[0060] In this embodiment, the lifting mechanism 3 uses a screw jack 31. By rotating the adjustment handwheel 33, the three-jaw self-centering chuck 2 and the paper cup clamped thereon are moved up and down, ensuring that the three-jaw self-centering chuck 2 and the paper cup clamped thereon are lifted smoothly and vertically, improving the test accuracy and making the operation easier. Usually, first use a caliper to measure the total height of the paper cup, calculate 2 / 3 of its height and mark it with a marker pen. After fixing the paper cup, rotate the adjustment handwheel 33 to lift and lower the screw of the screw jack 31 until the test rod is opposite to the marked position.

[0061] As the seventh embodiment of the present invention, as Figure 2 and 3 shown, the three-jaw self-centering chuck 2 is provided with three jaws, and the three jaws are manually adjusted to open and close by a ratchet wrench, so as to accurately fix the paper cup on the test axis, reduce the eccentric error, and make the measured body stiffness of the paper cup more accurate, solving the technical problem that the existing tray structure for placing the paper cup may have too large an offset from the detection axis during the paper cup test, resulting in inaccurate measurement results.

[0062] In this embodiment, the three-jaw self-centering chuck realizes manual adjustment of the jaw opening and closing through a ratchet wrench. The torque scale function of the ratchet wrench can quantitatively adjust the clamping force, which is more suitable for clamping the paper cup and avoiding being too tight or too loose caused by the operation of the traditional handle. The specific structure of the three-jaw self-centering chuck 2 is the prior art, and its three jaws are adjusted within the scope of the prior art to adapt to clamping the paper cup, such as matching the arc of the outer wall of the paper cup and adding a soft cushion.

[0063] As the eighth embodiment of the present invention, as Figure 1 and 5 shown, the control mechanism 7 further includes a printer 72. The printer 72 is electrically connected and signal-connected to the controller 74, so that the controller controls the printer 72 to print the test results through the operation of the touch screen 71.

[0064] As the ninth embodiment of the present invention, as Figure 1 , 2 and 5 shown, the control mechanism 7 further includes an emergency stop switch 73. The emergency stop switch 73 is electrically connected and signal-connected to the controller 74, so that the controller controls the power switch to be cut off through the signal of the emergency stop switch 73. In this embodiment, by setting the emergency stop switch, the power can be quickly cut off in an emergency to protect the tester.

[0065] It should be noted that the above-mentioned invention content and specific implementation manners are intended to prove the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the protection scope of the present invention. Those skilled in the art can make various modifications, equivalent replacements or improvements within the spirit and principle of the present invention. The protection scope of the present invention shall be subject to the appended claims.

Claims

1. An automated paper cup hardness tester, characterized in that, It includes a test platform (1), a three-jaw self-centering chuck (2), a lifting mechanism (3), a pressing mechanism (4, 4'), a driving mechanism (5), a guiding mechanism (6, 6'), and a control mechanism (7); among them, The three-jaw self-centering chuck (2) is erected above the test platform (1) to fix the paper cup on the test axis. The lifting mechanism (3) is fixedly connected below the test platform (1), and the lifting mechanism (3) is coaxially connected to the bottom of the three-jaw self-centering chuck (2) through a screw rod (34), so that the lifting mechanism (3) drives the screw rod (34) to drive the three-jaw self-centering chuck (2) and the paper cup fixed thereon to move up and down, thereby adjusting the test points of the pressing mechanism (4, 4') to the 2 / 3 position of the paper cup. The pressing mechanism (4, 4') is symmetrically erected on both sides of the three-jaw self-centering chuck (2); the front ends of the bottoms of the pressing mechanism (4, 4') are respectively connected to a left-hand and right-hand ball screw (8), the left end and the right end of the left-hand and right-hand ball screw (8) are respectively connected to the test platform (1) below through a first fixing plate (12) and a second fixing plate (12'), and the right end of the left-hand and right-hand ball screw (8) is connected to the driving mechanism (5); the rear ends of the bottoms of the pressing mechanism (4, 4') are respectively connected to the guiding mechanism (6, 6') correspondingly, and the guiding mechanism (6, 6') is fixedly connected to the bottom surface of the test platform (1), so that the driving mechanism (5) drives the left-hand and right-hand ball screw (8) to rotate, and then the pressing mechanism (4, 4') moves synchronously along the left-hand and right-hand ball screw (8) and the guiding mechanism (6, 6'). The control mechanism (7) includes a controller (74) and a touch screen (71), and the controller (74) is electrically connected and signal-connected to the touch screen (71), the driving mechanism (5), and the pressing mechanism (4, 4') respectively, so that the controller (74) controls the driving mechanism (5) to drive the pressing mechanism (4, 4') to move synchronously towards the three-jaw self-centering chuck (2) and the paper cup fixed thereon according to the signal of the touch screen (71), and the controller (74) obtains the stiffness value of the paper cup when the pressing mechanism (4, 4') presses the paper cup.

2. The automated paper cup hardness tester according to claim 1, characterized in that The pressing mechanism (4, 4') includes two test rods (41, 41'), a high-precision micro force sensor (42), and two connecting rods (43, 43'); among them, The left connecting rod (43) and the right connecting rod (43') are symmetrically erected on both sides of the three-jaw self-centering chuck (2), the top of the left connecting rod (43) is connected to the left test rod (41), the top of the right connecting rod (43') is connected to the fixed end of the high-precision micro force sensor (42), the force-receiving end of the high-precision micro force sensor (42) is connected to the right test rod (41'), and the probes of the left test rod (41) and the right test rod (41') are both horizontally oriented towards the three-jaw self-centering chuck (2); the high-precision micro force sensor (42) is electrically connected and signal-connected to the controller (74) of the control mechanism (7). On the double-start ball screw (8), there are symmetrically arranged a left thread section and a right thread section with the same lead and opposite helix directions. A left ball nut (81) is connected to the left thread section, and a right ball nut (81') is connected to the right thread section. The front end of the bottom of the left connecting rod (43) is fixedly connected to the left ball nut (81), and the front end of the bottom of the right connecting rod (43') is fixedly connected to the right ball nut (81'), so that when the double-start ball screw (8) rotates forward or backward, the left connecting rod (43) and the right connecting rod (43') move synchronously in the direction of approaching or departing from the three-jaw self-centering chuck (2). When the probes of the left test rod (41) and the right test rod (41') synchronously press the side wall of the paper cup, the high-precision micro-force sensor (42) starts to record the force value and transmits it to the controller (74) of the control mechanism (7).

3. The automatic paper cup hardness tester according to claim 2, wherein On the test platform (1), a left rectangular hole (11) and a right rectangular hole (11') are symmetrically arranged. The left connecting rod (43) is inserted into the left rectangular hole (11), and the right connecting rod (43') is inserted into the right rectangular hole (11'), so that the upper parts of the left connecting rod (43) and the right connecting rod (43') are above the test platform (1), and the lower parts of the left connecting rod (43) and the right connecting rod (43') are below the test platform (1). At both ends of the outer edge of the right rectangular hole (11') along the length of the right rectangular hole (11'), there are arranged an inductive switch A (44) and an inductive switch B (44') facing the right connecting rod (43'). The inductive switch A (44) and the inductive switch B (44') are respectively electrically connected and signal-connected to the controller (74) of the control mechanism (7), so that the controller (74) controls the driving mechanism (5) to drive the left test rod (41) and the right test rod (41') to move synchronously in the direction away from the three-jaw self-centering chuck (2) and the paper cup fixed thereon according to the induction signal of the inductive switch B (44'), and the controller (74) controls the driving mechanism (5) to stop according to the induction signal of the inductive switch A (44).

4. The automatic paper cup hardness tester according to claim 1, wherein The driving mechanism (5) includes a servo motor (51), a planetary reducer (52), a first sprocket (53), a second sprocket (54), and a chain (55); wherein The control end of the servo motor (51) is electrically connected and signal-connected to the controller (74) of the control mechanism (7). 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 fixing plate (12'). The output end of the planetary reducer (52) passes through the second fixing plate (12') and is coaxially connected to the first sprocket (53). The first sprocket (53) is connected to the second sprocket (54) through the chain (55). The right end of the double-start ball screw (8) passes through the second fixing plate (12') and is coaxially connected to the second sprocket (54), so that the controller (74) controls the servo motor (51), and then drives the double-start ball screw (8) to rotate forward or backward.

5. The automated paper cup hardness tester according to claim 1, characterized in that The guiding mechanism (6, 6') includes two linear guide rails (61, 61') and two connecting and strengthening seats (62, 62'); wherein, The left linear guide rail (61) and the right linear guide rail (61') are respectively fixedly connected to the left connecting rod (43) and the right connecting rod (43') of the pressing mechanism (4, 4') on the bottom surface of the test platform (1); the horizontal plane of the left connecting and strengthening seat (62) is connected to the left linear guide rail (61), and the vertical plane of the left connecting and strengthening seat (62) is connected to the bottom rear end of the left connecting rod (33), the horizontal plane of the right connecting and strengthening seat (62') is connected to the right linear guide rail (61'), and the vertical plane of the right connecting and strengthening seat (62') is connected to the bottom rear end of the right connecting rod (33'), so that the left connecting rod (43) and the right connecting rod (43') of the pressing mechanism (4, 4') respectively move synchronously along the corresponding left linear guide rail (61) and right linear guide rail (61') in the direction of approaching or departing from the three-jaw self-centering chuck (2).

6. The automated paper cup hardness tester according to claim 1, characterized in that The lifting mechanism (3) includes a screw jack (31), a guiding seat (32) and an adjusting handwheel (33); wherein, The guiding seat (32) is connected to the bottom of the screw jack (31), the top of the screw jack (31) is fixedly connected to the bottom surface of the test platform (1), and the adjusting handwheel (33) is connected to the input shaft end of the screw jack (31); A round hole is provided on the test platform (1), one end of a screw rod (34) passes through the guiding seat (32), the screw jack (31) and the round hole and is connected to the bottom of the three-jaw self-centering chuck (2), so that by rotating the adjusting handwheel (33) to drive the screw rod (34) to drive the three-jaw self-centering chuck (2) and the paper cup clamped thereon to move up and down.

7. The automated paper cup hardness tester according to claim 1, wherein, The three-jaw self-centering chuck (2) is provided with three jaws, and the three jaws are manually adjusted to open and close by a ratchet wrench.

8. The automated paper cup hardness tester according to claim 1, wherein The control mechanism (7) further includes a printer (72), and the printer (72) is electrically connected and signal-connected to the controller (74), so that the controller (74) controls the printer (72) to print the test result through the operation of the touch screen (71).

9. The automated paper cup hardness tester according to claim 1, characterized in that, The control mechanism (7) further includes an emergency stop switch (73), and the emergency stop switch (73) is electrically connected and signal-connected to the controller (74), so that the controller (74) controls to cut off the power switch through the signal of the emergency stop switch (73).

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