Roller gap measuring device

Abstract

The present invention relates to a roller gap measuring device for measuring a gap between a pair of rollers, the device comprising gap measuring sensor units for measuring the gap between the pair of rollers. The pair of rollers each comprise: a laterally extending rotary shaft; and bearing parts mounted on the rotary shaft. Each bearing part comprises: a bearing mounted on the outer surface of the rotary shaft; and a bearing housing for receiving the bearing therein. The gap measuring sensor units are located in the bearing housings and measure the gap between the pair of rollers by measuring the distances between the rotary shafts and the gap measuring sensor units.

Description

Roller gap measuring device

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2024-0046633, filed April 5, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a roller gap measuring device.

[0005] Secondary batteries have been applied to small fields such as mobile devices and laptop computers, but recently, their research direction has expanded to medium and large fields, and they are widely used in fields requiring high voltage and large capacity, such as energy storage systems (ESS) and electric vehicles (EV).

[0006] Such secondary batteries can be manufactured in the form of an electrode assembly formed by cross-stacking electrodes and separators, housed in a case or housing. In this case, the electrodes may have the form of electrode sheets coated with electrode active materials, etc., cut to a predetermined size or shape.

[0007] These electrode sheets, for example, go through at least one rolling process. Generally, the rolling of the electrode sheets is performed by rolling rollers. At this time, the gap between the rolling rollers can be used as basic data for controlling the operation of the rolling rollers. The gap can mean the narrowest gap (or space) formed between a pair of rolling rollers. If the gap is excessively large, the electrode sheet may not be rolled sufficiently. This may cause various problems, such as the rolled electrode sheet not being manufactured uniformly or having defects. Here, the surface of the rolling roller that comes into contact with the electrode sheet wears out as it is used. If the diameter is reduced due to wear or a portion is damaged and a groove is formed, a problem occurs in which some or all of the contact portions of the electrode sheet passing between multiple rolling rollers are not rolled.

[0008] In the past, when materials were fed into two main rolls and rolled, a problem occurred in which the gap between the rolls widened more than the set gap between the rolls.

[0009] The reason is that there is a gap between the rolls and the bearing, and the gap between the rolls increases by the amount of the gap.

[0010] Therefore, measuring the gap has become a crucial technology. However, the current method of measuring the actual gap is to directly touch the surface using an LVDT sensor, but this method has significantly reduced accuracy.

[0011] One aspect of the present invention is to provide a roller gap measuring device capable of accurately measuring a gap between a pair of rollers.

[0012] A roller gap measuring device according to an embodiment of the present invention is a roller gap measuring device that measures a gap between a pair of rollers, and includes a gap measuring sensor unit that measures the gap between the pair of rollers, wherein the pair of rollers each includes a rotational shaft extending in one direction; and a bearing unit mounted on the rotational shaft, the bearing unit including a bearing mounted on an outer surface of the rotational shaft; and a bearing housing that accommodates the bearing, and the gap measuring sensor unit is positioned in the bearing housing, and measures the gap between the pair of rollers by measuring a distance between the rotational shaft and the gap measuring sensor unit.

[0013] According to the present invention, the actual gap between a pair of rollers can be accurately measured by positioning a gap measuring sensor unit in a bearing housing of a bearing part in which a rotational axis of a pair of rollers is mounted, and measuring the distance between the rotational axis and the gap measuring sensor unit.

[0014] In addition, by further positioning a roller gap measuring sensor unit between the ends of a pair of rollers, the gap between the pair of rollers can be measured, thereby enabling the actual gap between the pair of rollers to be measured with remarkable accuracy.

[0015] Figure 1 is a perspective view showing the state of use of a roller gap measuring device according to an embodiment of the present invention.

[0016] Fig. 2 is a cross-sectional view showing the state of use of a roller gap measuring device according to an embodiment of the present invention.

[0017] Fig. 3 is a cross-sectional view showing a gap measurement sensor unit in a roller gap measurement device according to an embodiment of the present invention.

[0018] Figure 4 is a cross-sectional view showing an enlarged view of area A in Figure 3.

[0019] FIG. 5 is a perspective view showing a sensor ring of a gap measurement sensor unit in a roller gap measurement device according to an embodiment of the present invention.

[0020] Figure 6 is a cross-sectional view showing an enlarged view of area B in Figure 2.

[0021] Fig. 7 is a plan view showing a roller gap measuring sensor unit in a roller gap measuring device according to an embodiment of the present invention.

[0022] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In this specification, when reference numerals are given to components in each drawing, it should be noted that, as far as possible, identical components are given the same reference numerals even if they are shown in different drawings. Furthermore, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the gist of the present invention will be omitted.

[0023]

[0024] Roller gap measuring device according to an embodiment of the present invention

[0025]

[0026] Fig. 1 is a perspective view showing a state of use of a roller gap measuring device according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing a state of use of a roller gap measuring device according to an embodiment of the present invention.

[0027] Referring to FIGS. 1 and 2, a roller gap measuring device (100) according to an embodiment of the present invention is a roller gap measuring device (100) that measures a gap (g) between a pair of rollers (30), and includes a gap measuring sensor unit (110) that measures the gap (g) between a pair of rollers (30), and the pair of rollers (30) each includes a rotational shaft (31) extending in one direction and a bearing unit (60) mounted on the rotational shaft (31), and the bearing unit (60) includes a bearing (61) mounted on an outer surface of the rotational shaft (31), and a bearing housing (62) that accommodates the bearing (61). In addition, the roller gap measuring device (100) according to an embodiment of the present invention may further include a roller gap measuring sensor unit (120).

[0028]

[0029] In more detail, the roller gap measuring device (100) according to an embodiment of the present invention can measure the gap (g) (Gap) between a pair of rollers (30) in contact with a material sheet.

[0030] The material sheet can be composed of a sheet-shaped electrode.

[0031] The roller (30) may be extended in the longitudinal direction in a cylindrical shape. Here, the roller (30) may be made of a metal material. At this time, the roller (30) may be configured as a calendar roll. In addition, the roller (30) may have a rotational axis (31) extending in the direction of the central axis, so that the rotational axis (31) rotates and the roller (30) rotates.

[0032]

[0033] A pair of rollers (30) may each include a rotation shaft (31) extending in one direction and a bearing part (60) mounted on the rotation shaft (31).

[0034] The bearing part (60) may include a bearing (61) mounted on the outer surface of the rotation shaft (31) and a bearing housing (62) that accommodates the bearing (61).

[0035] Additionally, a pair of rollers (30) may include a first roller (10) and a second roller (20).

[0036] The first roller (10) may include a first rotational axis (11) extending in one direction and a first bearing portion (40) mounted on the first rotational axis (11).

[0037] The second roller (20) may include a second rotational axis (21) extending in one direction and a second bearing portion (50) mounted on the second rotational axis (21).

[0038] The first bearing portion (40) may include a first bearing (41) mounted on the outer surface of the first rotation shaft (11) and a first bearing housing (42) that accommodates the first bearing (41).

[0039] The second bearing portion (50) may include a second bearing (51) mounted on the outer surface of the second rotation shaft (21) and a second bearing housing (52) that accommodates the second bearing (51).

[0040]

[0041] FIG. 3 is a cross-sectional view showing a gap measurement sensor unit in a roller gap measurement device according to an embodiment of the present invention, FIG. 4 is a cross-sectional view showing an enlarged area A in FIG. 3, and FIG. 5 is a perspective view showing a sensor ring of a gap measurement sensor unit in a roller gap measurement device according to an embodiment of the present invention.

[0042] Referring to FIGS. 2 to 5, the gap measurement sensor unit (110) measures the gap (g) between a pair of rollers (30).

[0043] The gap measurement sensor unit (110) is located in the bearing housing (62) and measures the gap (g) between a pair of rollers (30) by measuring the distance between the rotation shaft (31) and the gap measurement sensor unit (110).

[0044] The gap measurement sensor unit (110) can be positioned inside each of the first bearing housing (42) and the second bearing housing (52).

[0045] The gap measurement sensor unit (110) may include a first measurement sensor (111) and a second measurement sensor (112) positioned on both sides inside the bearing housing (62). Accordingly, the gap (g) of the pair of rollers (30) can be measured by measuring the distance between the rotational axis (31) of the pair of rollers (30) and the first measurement sensor (111) and the second measurement sensor (112), respectively.

[0046] The gap measurement sensor unit (110) may further include a sensor ring (113) in which a first measurement sensor (111) and a second measurement sensor (112) are positioned. At this time, the sensor ring (113) may be positioned between the rotation shaft (31) and the bearing housing (62).

[0047] The outer surface of the sensor ring (113) can be attached to the inner surface of the bearing housing (62).

[0048] The sensor ring (113) is formed in a circular shape, and the first measurement sensor (111) and the second measurement sensor (112) can be positioned on the inner surface of both sides (113a, 113b). That is, the sensor ring (113) is formed in a circular shape, and the first measurement sensor (111) and the second measurement sensor (112) can be positioned on the inner surface of one side (113a) and the other side (113b) of the sensor ring (113), respectively.

[0049] The sensor ring (113) may have a first receiving groove (113a-1) in which a first measurement sensor (111) is positioned and a second receiving groove (113b-2) in which a second measurement sensor (112) is positioned formed on the inner surface. Here, the first receiving groove (113a-1) and the second receiving groove (113b-2) may be opened toward the rotation axis (31).

[0050] The first measurement sensor (111) and the second measurement sensor (112) are spaced apart from the rotation axis (31) by a predetermined distance and can measure the distance in a non-contact manner.

[0051] In addition, the first measurement sensor (111) and the second measurement sensor (112) may be arranged in a direction parallel to the arrangement direction of the pair of rollers (30). That is, for example, referring to FIG. 2, the first measurement sensor (111) and the second measurement sensor (112) may be arranged in the vertical direction, which is the arrangement direction of the pair of rollers (30). However, in the roller gap measuring device (100) according to the embodiment of the present invention, the first measurement sensor (111) and the second measurement sensor (112) are not necessarily limited to being attached to the sensor ring (113), and as another example, they may be attached to the inner wall of the bearing housing (62) without the sensor ring (113).

[0052] In addition, the first measurement sensor (111) and the second measurement sensor (112) may include a capacitive sensor. The capacitive sensor may be, for example, a static capacitive displacement sensor.

[0053] The capacitive sensor detects a change in capacitance and measures the distance between the first measurement sensor (111) and the second measurement sensor (112), which are capacitive sensors, and the rotational axis (31) of the roller (30), thereby extracting the gap value between a pair of rollers (30). For example, when an AC current of a constant frequency flows toward a conductive measurement object, the amplitude of the AC voltage is proportional to the distance from the measurement object, and thus the distance between the capacitive sensor and the measurement object can be measured.

[0054] Meanwhile, the roller gap measuring device (100) according to an embodiment of the present invention may further include a calculation unit (not shown). At this time, the first measurement sensor (111) and the second measurement sensor (112) are formed of electrostatic capacitance sensors, and the measured distance between the first measurement sensor (111) and the second measurement sensor (112) and the rotational axis (31) of the roller (30) can be measured and the measured measurement gap value can be transmitted to the calculation unit. Here, the calculation unit can extract the gap value between a pair of rollers (30) through the transmitted measurement gap value. In addition, although the connection lines of the first measurement sensor (111) and the second measurement sensor (112) and the calculation unit are omitted in the drawing, for example, they may be connected in various forms of wired connection lines or wireless connection forms, or may be mounted or included in the first measurement sensor (111) and the second measurement sensor (112).

[0055] Meanwhile, the operation unit can receive the measurement gap value of the first rotation axis (11) of the first roller (10) and the measurement gap value of the second rotation axis (21) of the second roller (20) measured by the first measurement sensor (111) and the second measurement sensor (112) respectively located inside the first bearing housing (42) and the second bearing housing (52), for example, and extract the gap value between a pair of rollers (30).

[0056] Here, the calculation unit can extract the amount of change by subtracting the initial measured gap values ​​for the first rotational axis (11) of the first roller (10) and the second rotational axis (21) of the second roller (20) stored in the memory from the average value of the sum of the measured gap values ​​for the first rotational axis (11) of the first roller (10) and the measured gap values ​​for the second rotational axis (21) of the second roller (20), and can add the amount of change to the initial gap value between the first roller (10) and the second roller (20) stored in the memory (not shown) to extract the actual gap value between the first roller (10) and the second roller (20). Here, since the amount of change in the rotational axis (31) can be estimated to be the same as the amount of change between the first roller (10) and the second roller (20), the gap between the first roller (10) and the second roller (20) can be extracted by measuring the amount of change in the rotational axis (31). At this time, the memory may be included in the operation unit or may be included in a device external to the operation unit and electrically connected to the operation unit.

[0057] That is, when the operation unit determines that the measured gap value for the first rotation axis (11) of the first roller (10) after the device process or after adjusting the gap between a pair of rollers (30) is a, the measured gap value for the second rotation axis (21) of the second roller (20) is b, the initial measured gap value, which is the average of the sum of the initial measured gap value for the first rotation axis (11) of the first roller (10) before the device process stored in the memory and the measured gap value for the second rotation axis (21) of the second roller (20), is T, the gap change amount between the first roller (10) and the second roller (20) is E, and the gap value of the first roller (10) and the second roller (20) measured after the device process is g, the following conditional expression (1) is satisfied.

[0058] (a+b) / 2 - T = E Condition (1)

[0059]

[0060] And, when the gap change amount between the first roller (10) and the second roller (20) is E, the initial gap value between the first roller (10) and the second roller (20) before the device process stored in the memory is Z, and the gap value of the first roller (10) and the second roller (20) measured after the device process is g, the following conditional expression (2) is satisfied.

[0061] E + Z = g condition (2)

[0062] Here, for example, a, which is a measurement gap value for the first rotation axis (11) of the first roller (10), is +11 um, b, which is a measurement gap value for the second rotation axis (21) of the second roller (20), is +11 um, and T, which is an initial measurement gap value which is an average of the sum of the initial measurement gap value for the first rotation axis (11) of the first roller (10) before the device process stored in the memory and the measurement gap value for the second rotation axis (21) of the second roller (20), is 1 um, E, which is a gap change amount between the first roller (10) and the second roller (20), can be obtained as (11 um + 11 um) / 2 - 1 um = 10 um through the above conditional expression (1). And, when Z, which is the initial gap value between the first roller (10) and the second roller (20) before the device process stored in the memory, is 100 um, g, which is the gap value of the first roller (10) and the second roller (20) measured after the device process, can be obtained as 10 um + 100 um = 110 um through the above conditional expression (2).

[0063]

[0064] Fig. 6 is a cross-sectional view showing an enlarged area B in Fig. 2, and Fig. 7 is a plan view showing a roller gap measuring sensor unit in a roller gap measuring device according to an embodiment of the present invention.

[0065] Referring to FIGS. 2, 6 and 7, the roller gap measuring sensor unit (120) is positioned between the ends of a pair of rollers (30) and can measure the gap (g) between the pair of rollers (30).

[0066] The ends of a pair of rollers (30) may form steps (12, 22) with a decreasing diameter. At this time, the steps (12, 22) may be formed at the ends of the bodies of the pair of rollers (30). Here, the bodies of the pair of rollers (30) may be a portion excluding the rotational shaft (31).

[0067] The end of the roller gap measuring sensor unit (120) is positioned between the steps (12, 22) of a pair of rollers (30), so that the gap (g) of a pair of rollers (30) can be measured by measuring the gap between the steps (12, 22) of a pair of rollers (30).

[0068] The end of the roller gap measuring sensor unit (120) may have detection units (121, 122) positioned on both sides facing the steps (12, 22) of a pair of rollers (30) to detect the distance (d1, d2) between the steps (12, 22) of a pair of rollers (30).

[0069] The sensing unit (121, 122) may include a capacitive sensor. The capacitive sensor may be, for example, a static capacitive displacement sensor.

[0070] At this time, the detection unit (121, 122) is composed of a capacitance sensor, and can measure the distance (d1, d2) between the measured pair of rollers (30) and the step (12, 22) and transmit the measured gap value to the calculation unit. In addition, the calculation unit can be connected to a control unit that controls the driving of the pair of rollers (30), for example.

[0071]

[0072] Meanwhile, for example, steps (12, 22) can be processed on both sides of a pair of rollers (30) in the longitudinal direction, for example, to a depth of 500 μm. That is, the distance from the step (12) of the first roller (10) to the step (22) of the second roller (20) can be, for example, 1000 μm, but the present invention is not limited thereto. Here, if the end thickness of the roller gap measuring sensor unit (120) where the detection units (121, 122) are positioned is 900 um, and the initial gap value between the first roller (10) and the second roller (20) before the device process stored in the memory is 0 um, the distance from the roller gap measuring sensor unit (120) to the step (12, 22) of a pair of rollers (30) measured by the detection units (121, 122) positioned on each of the end sides of the roller gap measuring sensor unit (120) can be measured as 100 um. In addition, the 100 um distance to the step (12, 22) of a pair of rollers (30) measured can be stored as an initial value in the memory.

[0073] Thereafter, if the gap between the first roller (10) and the second roller changes after the process or after adjusting the roller gap so that the actual gap becomes 100 um, the distance from the roller gap measuring sensor unit (120) to the steps (12, 22) of the pair of rollers (30) is measured as 200 um. Accordingly, the calculation unit can estimate the gap between the first roller (10) and the second roller (20) as 100 um by subtracting the initial value of 100 um stored in the memory from the distance from the roller gap measuring sensor unit (120) to the steps (12, 22) of the pair of rollers (30) of 200 um.

[0074]

[0075] Referring to FIG. 2, the roller gap measuring device (100) according to the embodiment of the present invention configured as described above measures the gap (g) between a pair of rollers (30) by positioning the gap measuring sensor unit (110) on the bearing housing (62) of the bearing unit (60) on which the rotational shaft (31) of the pair of rollers (30) is mounted, thereby measuring the distance between the rotational shaft (31) and the gap measuring sensor unit (110), thereby accurately measuring the actual gap or a gap value close to the actual gap that has occurred between the pair of rollers (30) during the process. Accordingly, by detecting the gap (g) between the pair of rollers (30) that has occurred due to bearing clearance during the process close to the actual gap, the insufficient rolling amount can be calculated, and there is an effect that feedback control is possible so that additional rolling can be performed by the corresponding gap. And, after the worker adjusts and resets the gap (g) between a pair of rollers (30), it is easy to check through the gap measurement sensor unit (110) whether the reset pair of rollers (30) are properly positioned in the bearing unit (60) or whether there is an abnormality in the combined state.

[0076] In addition, by further positioning a roller gap measuring sensor unit (120) between the ends of a pair of rollers (30), the gap (g) between the pair of rollers (30) can be measured, so that the actual gap formed during the process between the pair of rollers (30) or the gap value can be measured remarkably accurately and precisely, remarkably close to the actual gap.

[0077]

[0078] While the present invention has been described in detail through specific examples, these are intended to illustrate the invention in detail and are not intended to be limiting. Those skilled in the art will appreciate that various implementations are possible within the technical scope of the present invention.

[0079] Additionally, the specific scope of protection of the invention will be made clear by the appended claims.

[0080]

[0081] [Explanation of symbols]

[0082] 10: First roller

[0083] 11: First rotation axis

[0084] 12: Step

[0085] 20: Second roller

[0086] 21: Second rotation axis

[0087] 22: Step

[0088] 30: Roller

[0089] 31: Rotation axis

[0090] 40: First bearing section

[0091] 41: First bearing

[0092] 42: First bearing housing

[0093] 50: Second bearing section

[0094] 51: Second bearing

[0095] 52: Second bearing housing

[0096] 60: Bearing section

[0097] 61: Bearing

[0098] 62: Bearing housing

[0099] 100: Roller gap measuring device

[0100] 110: Gap measurement sensor section

[0101] 111: First measurement sensor

[0102] 112: Second measurement sensor

[0103] 113: Sensoring

[0104] 113a: One side

[0105] 113a-1: 1st reception home

[0106] 113b: Other side

[0107] 113b-2: Second Reception Home

[0108] 120: Roller gap measurement sensor section

[0109] 121,122: Sensor

[0110] d1,d2: distance

[0111] g: gap

Claims

1. A roller gap measuring device that measures the gap between a pair of rollers, It includes a gap measuring sensor unit that measures the gap between the pair of rollers, The above pair of rollers each include a rotating shaft extending in one direction; and a bearing part mounted on the rotating shaft, The above bearing part includes a bearing mounted on the outer surface of the rotating shaft; and a bearing housing that accommodates the bearing, A roller gap measuring device that measures the gap between a pair of rollers by measuring the distance between the rotational axis and the gap measuring sensor unit, wherein the gap measuring sensor unit is located in the bearing housing.

2. In claim 1, The above pair of rollers includes a first roller and a second roller, The first roller includes a first rotational shaft extending in one direction; and a first bearing part mounted on the first rotational shaft, The second roller includes a second rotational shaft extending in one direction; and a second bearing part mounted on the second rotational shaft, The first bearing portion includes a first bearing mounted on an outer surface of the first rotation shaft; and a first bearing housing that accommodates the first bearing. The second bearing portion includes a second bearing mounted on the outer surface of the second rotation shaft; and a second bearing housing accommodating the second bearing. The above gap measuring sensor unit is a roller gap measuring device located inside the first bearing housing and the second bearing housing, respectively.

3. In claim 2, The above gap measurement sensor unit includes a first measurement sensor and a second measurement sensor located on both sides inside the bearing housing, A roller gap measuring device that measures the gap of the pair of rollers by measuring the distance between the rotational axis of the pair of rollers and the first measuring sensor and the second measuring sensor, respectively.

4. In claim 3, The above gap measurement sensor unit further includes a sensor ring in which the first measurement sensor and the second measurement sensor are positioned, The above sensor ring is a roller gap measuring device located between the rotation shaft and the bearing housing.

5. In claim 4, A roller gap measuring device in which the above sensor ring is formed in a circular shape and the first measuring sensor and the second measuring sensor are positioned on the inner surface of both sides.

6. In claim 5, The above sensor ring is A first receiving groove in which the first measurement sensor is positioned and a second receiving groove in which the second measurement sensor is positioned are formed on the inner surface, A roller gap measuring device in which the first receiving groove and the second receiving groove are open toward the rotation axis.

7. In claim 6, A roller gap measuring device in which the first measurement sensor and the second measurement sensor are spaced apart from the rotation axis by a predetermined distance to measure the distance in a non-contact manner.

8. In claim 5, The outer surface of the above sensor ring is a roller gap measuring device attached to the inner surface of the above bearing housing.

9. In claim 3, A roller gap measuring device in which the first measurement sensor and the second measurement sensor are arranged in a direction parallel to the arrangement direction of the pair of rollers.

10. In any one of claims 3 to 9, A roller gap measuring device wherein the first measuring sensor and the second measuring sensor include electrostatic capacitance sensors.

11. In claim 3, A roller gap measuring device further comprising a calculation unit that receives the measured gap value by measuring the distance between the rotation axes of the pair of rollers from the first measurement sensor and the second measurement sensor, and extracts the gap value between the pair of rollers.

12. In claim 11, The above operation unit A roller gap measuring device that extracts a change amount by subtracting the initial measured gap values ​​for the first rotational axis of the first roller and the second rotational axis of the second roller, which are stored in the memory, from the average value of the sum of the measured gap values ​​for the first rotational axis of the first roller and the measured gap values ​​for the second rotational axis of the second roller, and adds the change amount to the initial gap value between the first roller and the second roller, which is stored in the memory, to extract the gap value between the first roller and the second roller.

13. In claim 1, A roller gap measuring device further comprising a roller gap measuring sensor unit positioned between the ends of the pair of rollers and measuring a gap between the pair of rollers.

14. In claim 13, The ends of the above pair of rollers form a step with a decreasing diameter, A roller gap measuring device that measures the gap between the pair of rollers by measuring the gap between the steps of the pair of rollers, wherein the end of the roller gap measuring sensor part is located between the steps of the pair of rollers.

15. In claim 14, The end of the above roller gap measurement sensor part A roller gap measuring device in which a sensing unit for detecting the distance between the steps of the pair of rollers is positioned on each side facing the steps of the pair of rollers.

16. In claim 15, The above detection unit is a roller gap measuring device including a capacitance sensor.

Images