CN218956327U

CN218956327U - Short-distance compression strength tester and calibration device for paper and paperboard

Info

Publication number: CN218956327U
Application number: CN202223312591.5U
Authority: CN
Inventors: 魏英歌; 王传贤; 赵鹏程
Original assignee: Hangzhou Hengzheng Testing Technology Co ltd
Current assignee: Hangzhou Hengzheng Testing Technology Co ltd
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-02
Anticipated expiration: 2032-12-09

Abstract

The utility model relates to the technical field of test equipment, in particular to a short-distance compression strength tester and a calibration device for paper and paper boards, wherein the calibration device comprises a connecting rod connected to a clamp connected with a pressure sensor and a first steering component arranged on the connecting rod, one end of a traction wire is a fixed end fixedly arranged, the other end of the traction wire is a free end, the free end turns around the periphery of the first steering component and then turns to the direction, and the free end extends towards the fixed end in the same direction, so that the connecting rod bears the resultant force larger than the tension. According to the utility model, the traction wire is wound on the periphery of the first steering component, one end of the traction wire is fixed, and the other end of the traction wire is movable, so that a structure similar to a movable pulley is formed, the connecting rod is subjected to resultant force larger than the tension of the free end, and the corresponding tension can be reduced under the condition of providing the pressure required by the pressure sensor, namely the weight of the weight is reduced.

Description

Short-distance compression strength tester and calibration device for paper and paperboard

Technical Field

The utility model relates to the technical field of test equipment, in particular to a short-distance compression strength tester and a calibration device for paper and paper boards.

Background

Short distance compression (SCT) refers to the maximum compressive force, expressed in kN/m, that a paper and board sample is subjected to per unit width when it begins to break. The test principle is as follows: a15 mm wide specimen was clamped between two clamps 0.7mm apart, compressed until failure, the maximum compressive force was measured, and the short-range compressive strength was calculated. The specific test method and test equipment refer to the national standard GB/T2679.10-1993.

The applicant discloses in chinese patent (CN 108318347B) a short-distance compression strength testing device for paper or cardboard, wherein one end of the paper is clamped by a first clamping mechanism and a second clamping mechanism respectively, and a driving mechanism drives the first clamping mechanism and the second clamping mechanism to move in opposite directions until the paper is crushed and destroyed, and the pressure value on a pressure sensor is calculated when the recording paper is destroyed.

According to the national standard, the test device needs to be checked and calibrated regularly. The method comprises the following steps: and in the whole measuring range, checking weights are selected according to equal intervals to check, and the deviation of any point within 10% -100% of the whole measuring range cannot exceed +/-1% of the reading. The applicant notes that the full-scale weight has a weight of 50kg during the calibration process, and is heavy and inconvenient to carry.

Disclosure of Invention

In order to solve the above problems, a first object of the present utility model is to provide a calibration device for a short-distance compression strength tester for paper and paperboard, which uses the labor-saving characteristic of a movable pulley to reduce the weight of a required weight under the condition of providing an original tensile force.

For the first purpose of the utility model, the following technical scheme is adopted for implementation:

the utility model provides a calibrating device of paper and cardboard short distance compressive strength tester, includes the connecting rod of connecting on the anchor clamps that link to each other with pressure sensor and sets up the first steering component on the connecting rod, and the one end of haulage line is the stiff end of fixed setting, and the other end of haulage line is the free end, and the direction is changed after the periphery of first steering component is walked around to the free end, extends towards the stiff end syntropy, and the free end exerts the pulling force, makes the connecting rod bear and is greater than the resultant force of pulling force.

Preferably, a second steering member is further included, the free end of the traction wire extending downwardly in a transition direction around the outer periphery of the second steering member.

Preferably, the second steering member is connected with an adjusting assembly for adjusting the height of the second steering member.

Preferably, the fixed end is fixedly connected to the second steering component, so that the fixed end of the traction wire and the free end of the traction wire are subjected to height adjustment at the same time.

Preferably, the device further comprises a second connecting seat, an adjusting groove extending longitudinally is formed in the second connecting seat, the second steering component is movably arranged in the adjusting groove, the adjusting component comprises an adjusting screw connected to the second connecting seat in a threaded mode, the lower end of the adjusting screw is abutted to the bottom of the second steering component, and the adjusting screw is screwed to adjust the height of the second steering component.

Preferably, the two parts of the traction wire which bypass the first steering member are arranged in parallel and extend in the horizontal direction.

Preferably, the first steering member is a first pulley, and an axis of the first pulley is disposed in a longitudinal direction.

The second object of the utility model is to provide a short-distance compression strength tester for paper and paper board, comprising a casing and the calibrating device, wherein the casing is provided with a testing plane, two clamps for clamping two ends of paper respectively are arranged on the testing plane, one clamp is provided with the pressure sensor, and the connecting rod is arranged on the clamp.

Preferably, the casing is provided with a through hole for the lower end of the connecting rod to enter, and the lower end of the connecting rod penetrates through the through hole and is detachably connected to the clamp.

In summary, the beneficial effects of the utility model are as follows: through winding the traction wire around the periphery of first steering component to traction wire one end is fixed, and the other end is movable, thereby forms the structure of similar movable pulley, makes the connecting rod receive the resultant force that is greater than free end pulling force, and then can reduce corresponding pulling force under the circumstances that provides required pressure for pressure sensor, reduces the weight of weight promptly.

Drawings

FIG. 1 is a schematic drawing in half section of a short-range compression strength tester for paper and paperboard.

Fig. 2 is a partial enlarged view at a in fig. 1.

Fig. 3 is a top view of a short-range compression strength tester for paper and paperboard.

Detailed Description

First of all, the main structure of the tester is described simply, as shown in fig. 1 and 2, the tester comprises a casing 1, the upper end surface of the casing 1 is a test plane, a first clamp 2 and a second clamp 3 for clamping two ends of paper are arranged on the test plane, and the first clamp 2 and the second clamp 3 are close to each other under the action of a driving mechanism, so that the compression of the paper is realized. A pressure sensor 4 for detecting pressure is connected to one of the clamps (the second clamp 3 in fig. 1), and short-distance compression strength is calculated from a pressure value when the recording paper is crushed. The structures of the first clamp 2, the second clamp 3 and the driving mechanism can be referred to in chinese patent (CN 108318347B), and will not be described herein.

According to the national standard, the tester needs to be calibrated regularly, standard weights are selected to be checked according to equal intervals during calibration, and the deviation of any point within 10% -100% of the full range is ensured not to exceed +/-1% of the reading. The weight of the full-scale weight reaches 50Kg, and the full-scale weight is inconvenient to carry. Therefore, the utility model provides a calibrating device for calibrating a tester, which utilizes the labor-saving characteristic of a movable pulley to reduce the weight of a weight while providing the original tensile force.

As shown in fig. 2, the upper end surface of the casing 1 is provided with a through hole 11 communicating with the inside of the casing 1, and the through hole 11 is located above the second clamp 3, a connecting rod 5 is provided in the through hole 11, the connecting rod 5 is a screw in this embodiment, and the lower end of the screw is fixed in the second clamp 3 by threaded connection. The upper portion of connecting rod 5 exposes outside casing 1, and the upper portion of connecting rod 5 is connected with first connecting seat 6 through the string, is provided with first pulley 61 (first steering component) in the first connecting seat 6, is provided with traction wire 7 on the first pulley 61, and traction wire 7 winds on the periphery of first pulley 61 to the both ends of traction wire 7 all extend to the right side of casing 1 right. Referring to fig. 1 and 3, the right side of the casing 1 is provided with a second coupling seat 8, a second pulley 81 (second steering member) is provided on the second coupling seat 8, and the free end 71 of the traction wire 7 is redirected downward after bypassing the second pulley 81, and the free end 71 is used for coupling weights. One side of the second connecting seat 8 is fixedly provided with a fixed block 9, and a fixed end 72 of the traction wire 7 is connected to the fixed block 9. It should be noted that the traction wires 7 located at the front and rear sides of the first pulley 61 are preferably parallel to each other, so that when the traction wires 7 are tensioned, the connecting rod 5 receives a tensile force twice as much as the traction wires 7 to maximize the reduction of the weight of the required weight.

As shown in fig. 1, the pressure sensor 4 is preferably an S-shaped tension sensor, the pressure sensor 4 is horizontally arranged, one end of the pressure sensor 4 is fixedly connected to the second clamp 3, and the other end of the pressure sensor 4 is fixedly connected to the inside of the casing 1, so that when the second clamp 3 receives rightward pressure, the pressure can be transmitted to the pressure sensor 4, and thus, the pressure value is recorded through the pressure sensor 4.

When the calibration device is used, as shown in fig. 1, a weight of, for example, 25kg is attached to the free end 71 of the traction wire 7, the free end 72 of the traction wire 7 will be subjected to a downward pulling force of 250N, and this pulling force will tension the whole traction wire 7, so that the traction wire 7 will act on the fixing block 9 after bypassing the first pulley 61, and thus the fixed end 71 of the traction wire 7 will also be subjected to a pulling force of 250N, i.e. in fig. 3, both ends on the right side of the traction wire 7 will be subjected to a pulling force of 250N to the right, and thus for the first pulley 61 a resultant force of 500N will be applied to the second clamp 3 via the connecting rod 5, and thus the pressure sensor 4 will be able to detect a corresponding pressure value. That is, the calibration device can generate the same pulling force as the original 50Kg weight using only one 25Kg weight, thereby reducing the weight of the required weight.

It should be noted that, although the connecting rod 5 in the present embodiment is provided on the pressure sensor 4 by screwing, it is not excluded that the connecting rod 5 is fixed by other means, such as welding, interference fit, or the like. Furthermore, the first connecting seat 6 may be integrally formed on the connecting rod 5, and may not be connected by a string, and may even directly connect the first pulley to the connecting rod 5. In addition, more pulleys may be provided between the first pulley 61 and the second pulley 81 to further reduce the weight of the required weight.

As shown in fig. 2, in the present embodiment, the axis of the second pulley 61 is disposed longitudinally such that the portion of the traction wire 7 above the housing 1 extends at the same height, but in other embodiments, the axis of the second pulley 61 may be at any angle, for example, the axis extends in a horizontal direction, but it is necessary to ensure that the portion of the traction wire 7 above the housing 1 extends in a horizontal plane.

Note that when an angle is formed between the extending direction of the traction wire 7 and the horizontal plane, the force in the horizontal direction, which is applied to the connecting rod 5, will change, thereby affecting the accuracy of the calibration result, and therefore, in this embodiment, an adjusting component for adjusting the height of the second pulley 81 is further provided on the second connecting seat 8, and the traction wire 7 can extend in the horizontal direction by adjusting the height of the second pulley 81. Specifically, as shown in fig. 1, the adjusting component includes an adjusting screw 82 disposed at the lower end of the second pulley 81, the middle of the adjusting screw 82 is screwed on the second connecting seat 8, the upper end of the adjusting screw 82 abuts against the lower end of the second pulley 81, and the second pulley 81 is disposed in the second connecting seat 8 and can move up and down, so that the adjusting screw 82 is screwed, the height of the upper end of the adjusting screw 82 can be controlled, and the height of the second pulley 81 can be adjusted, so that the included angle between the traction wire 7 and the horizontal direction can be changed.

Specifically, as shown in fig. 1, the front and rear sides of the first pulley seat 8 are provided with longitudinally extending adjusting grooves 83, and the front and rear ends of the middle pulley shaft 811 of the second pulley 81 are movably disposed in the adjusting grooves 83, so as to realize the up-and-down movement of the second pulley 81.

Further, the above fixing block 9 may be fixedly coupled to the pulley shaft 811, so that the height of the fixing block 9 can be adjusted while adjusting the height of the second pulley 81, thereby simultaneously adjusting the heights of the front and rear portions of the traction wire 7. However, the discharge fixing block 9 is not provided at other positions, and for example, the fixing block 9 may be fixedly provided on the casing 1, and the fixing end 71 of the traction wire 7 may be fixed.

In addition, a laser level (not shown) may be provided on the housing for convenience in observing whether the traction wire 7 is in the horizontal plane.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a calibrating device of paper and cardboard short-distance compressive strength tester, a serial communication port, including connecting rod (5) and the first steering component of setting on connecting rod (5) on the anchor clamps that link to each other with pressure sensor (4), the one end of haulage line (7) is stiff end (71) of fixed setting, the other end of haulage line (7) is free end (72), change the direction after the periphery of first steering component is walked around to free end (72), extend towards stiff end (71) syntropy, free end (72) apply the pulling force, make connecting rod (5) bear the resultant force that is greater than the pulling force.

2. Calibration device for a paper and board short-range compression strength tester according to claim 1, characterized in that it further comprises a second steering member, the free end (72) of the traction wire (7) extending downwards in a direction of transition after bypassing the periphery of the second steering member.

3. The calibration device for a short-range compression strength tester for paper and board according to claim 2, wherein an adjusting assembly for adjusting the height of the second steering member is connected to the second steering member.

4. A calibration device for a paper and board short-range compression strength tester according to claim 3, characterized in that the fixed end (71) is fixedly connected to the second steering member such that the fixed end (71) of the traction wire (7) is height-adjusted simultaneously with the free end (72) of the traction wire (7).

5. A calibration device for a short-range compression strength tester for paper and board according to claim 3, further comprising a second connecting seat (8), wherein an adjusting groove (83) extending longitudinally is arranged on the second connecting seat (8), the second steering component is movably arranged in the adjusting groove (83), the adjusting component comprises an adjusting screw (82) connected to the second connecting seat (8) in a threaded manner, the lower end of the adjusting screw (82) is abutted to the bottom of the second steering component, and the adjusting screw (82) is screwed to adjust the height of the second steering component.

6. Calibration device for a paper and board short-range compression strength tester according to claim 1, characterized in that the two parts of the traction wire (7) which bypass the first steering member are arranged in parallel and extend in horizontal direction.

7. Calibration device for a paper and board short-range compression strength tester according to claim 1, characterized in that the first steering member is a first pulley (61), the axis of the first pulley (61) being arranged in the longitudinal direction.

8. The short-distance compression strength tester for paper and paper boards is characterized by comprising a machine shell (1) and the calibrating device according to any one of claims 1-7, wherein the machine shell (1) is provided with a test plane, two clamps which are used for clamping two ends of the paper respectively are arranged on the test plane, one of the clamps is provided with the pressure sensor (4), and the connecting rod (5) is arranged on the clamp.

9. The short-distance compression strength tester for paper and paperboard according to claim 8, wherein the casing (1) is provided with a through hole (11) for the lower end of the connecting rod (5) to enter, and the lower end of the connecting rod (5) is detachably connected to the clamp through the through hole (11).