Rolling device capable of rapidly adjusting roll gap

Abstract

The utility model relates to the technical field of battery pole piece production equipment, and discloses a rolling device capable of quickly adjusting a roll gap, which comprises a rack, and a power assembly, an upper roll assembly, a lower roll assembly and a lifting assembly which are arranged on the rack, the power assembly is in transmission connection with the upper roller assembly and the lower roller assembly; the upper roller assembly and the lower roller assembly are oppositely arranged, and a gap between the upper roller assembly and the lower roller assembly is a roller gap; the lifting assembly drives the lower roller assembly to get close to or away from the upper roller assembly to change the roller gap width. A rolling assembly is arranged between the lower roller assembly and the rack, and when the lower roller assembly is close to or away from the upper roller assembly, the lower roller assembly makes rolling contact with the rack through the rolling assembly. According to the scheme, the lower roller assembly is in rolling contact with the rack through the rolling assembly, so that the running friction resistance of the lower roller assembly is reduced, the size of a roller gap is quickly responded and adjusted, the thickness consistency of the rolled pole piece can be effectively ensured, the reject ratio of the pole piece is reduced, and the production efficiency of the lithium battery pole piece is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of battery electrode production equipment, and in particular to a rolling device with rapidly adjustable roll gap. Background Technology

[0002] Electrodes are an important component of batteries. The thickness of the electrodes directly affects the battery's energy density, charge and discharge efficiency, cycle life, and so on. Therefore, whether the thickness of the electrodes is uniform directly determines the quality of the produced battery.

[0003] In the current process of rolling electrode sheets, the size of the roll gap is controlled in real time by an AGC hydraulic servo system to maintain a constant roll gap and ensure the consistency of electrode sheet thickness. However, in existing lithium battery electrode sheet coating processes, there are single-sided and double-sided electrode sheet coating processes. The compaction density of single-sided and double-sided electrodes also needs to be consistent. Since the thickness of double-sided electrodes is greater than that of single-sided electrodes, the distance the rolls travel when rolling double-sided electrodes is greater than the distance traveled when rolling single-sided electrodes. During the rolling process, as the electrode sheet conveyor speed increases, the size of the roll gap between the two rolls needs to be changed during the transition from double-sided to single-sided rolling. If the response speed of adjusting the roll gap cannot keep up, the pressure between the two rolls will not be effectively applied to the single-sided surface, resulting in the single-sided compaction density and electrode sheet thickness not meeting the standards. Similarly, in the production of rolled electrode sheets, the incoming electrode sheets often contain areas with empty foil, exposed foil, or adhesive tape. Before these areas enter the main rolling mill, the lower roller needs to descend, widening the gap between the two rollers. If this gap isn't adjusted quickly enough, it can cause the tape to break, affecting product quality. After these areas pass through the rolling mill, the lower roller needs to rise rapidly to reduce the gap and apply pressure. If the gap adjustment response is too slow, it will affect production efficiency. Therefore, the speed of the gap adjustment is crucial for electrode processing.

[0004] Chinese Patent CN202310883207.7 discloses a roll gap adjustment device and method for a battery electrode rolling mill, belonging to the field of battery electrode production technology. It includes a base, an upper roll, a lower roll, and a roll gap adjustment mechanism. A frame is provided on the upper end face of the base; upper roll bearing seats are provided at both ends of the upper roll, and are fixedly mounted on the upper end of the frame; lower roll bearing seats are provided at both ends of the lower roll, and are slidably mounted on the frame and located below the upper roll bearing seats; the roll gap adjustment mechanism includes an upper mounting seat and a lower mounting seat. The upper mounting seat is located on the lower end face of the upper roll bearing seat, and an upper electromagnet is mounted on the lower end face of the upper mounting seat. The lower mounting seat is located on the base, and a lower electromagnet is mounted on the upper end face of the lower mounting seat. The roll gap adjustment device for a battery electrode rolling mill provided by this invention uses magnetic adjustment, solving the problem of slow response speed in mechanical adjustment and hydraulic oil leakage in hydraulic adjustment. This solution needs further improvement.

[0005] This invention overcomes the shortcomings of the prior art and provides a rolling device with a rapidly adjustable roll gap, which can quickly adjust the size of the roll gap and effectively ensure the consistency of the thickness of the electrode sheet after rolling. Utility Model Content

[0006] The main purpose of this utility model is to provide a rolling device with a rapidly adjustable roll gap, including a frame and a power assembly, an upper roll assembly, a lower roll assembly and a lifting assembly disposed on the frame;

[0007] The power assembly is connected to the upper and lower roll assemblies via a transmission.

[0008] The upper roll assembly and the lower roll assembly are arranged opposite to each other, and the gap between the upper roll assembly and the lower roll assembly is the roll gap; the lifting assembly acts on the lower roll assembly, causing the lower roll assembly to move closer to or away from the upper roll assembly to change the roll gap width;

[0009] A rolling assembly is provided between the lower roll assembly and the frame. When the lower roll assembly approaches or moves away from the upper roll assembly, it makes rolling contact with the frame through the rolling assembly.

[0010] Optionally, the lower roll assembly includes a lower roll and a lower roll bearing housing. The lower roll is connected to the power assembly for transmission. The lower roll bearing housing is provided at both ends of the lower roll. A rolling assembly is provided between the contact surface of the lower roll bearing housing and the frame. The lower roll bearing housing makes rolling contact with the frame through the rolling assembly. A lifting assembly is provided below the lower roll bearing housing. The lifting assembly acts on the lower roll bearing housing.

[0011] Optionally, the rolling assembly includes a ball cover plate, rolling balls, and a fixing plate, wherein the fixing plate is connected to the frame and is disposed opposite to and fixedly connected to the ball cover plate;

[0012] The ball bearing cover plate is uniformly provided with multiple through holes and countersunk holes of a predetermined depth coaxial with the through holes. The diameter of the countersunk hole is larger than the diameter of the rolling ball, and the diameter of the through hole is smaller than the diameter of the rolling ball. The rolling ball is disposed in the countersunk hole between the ball bearing cover plate and the fixing plate. The bottom of the rolling ball is in rolling contact with the fixing plate, and the top of the rolling ball protrudes from the surface of the ball bearing cover plate through the through hole. The part of the rolling ball protruding from the surface of the ball bearing cover plate is in rolling contact with the lower roll bearing seat.

[0013] Optionally, a set screw is provided between the fixed plate and the frame. The distance between the rolling assembly and the lower roll bearing seat is adjusted by the push-out force of the set screw, so that the rolling steel ball contacts the lower roll bearing seat.

[0014] Guide strips are provided on the upper and lower sides of the fixing plate.

[0015] Optionally, the height of the rolling steel ball protruding from the surface of the steel ball cover plate is 0.9-1.1 mm.

[0016] Optionally, fixed support plates are provided on both sides of the lower roll bearing seat, and the fixed support plates are in rolling contact with the rolling steel balls.

[0017] Optionally, the lifting assembly is a hydraulic system located below the lower roll bearing seat and connected to the lower roll bearing seat, thereby driving the lower roll bearing seat to rise and fall.

[0018] Optionally, the power assembly includes a motor, a reducer, and a coupling. The output end of the motor is connected to the reducer, and the two ends of the coupling are respectively connected to the reducer and the lower roll, or the two ends of the coupling are respectively connected to the reducer and the upper roll in the upper roll assembly.

[0019] Optionally, the upper roll assembly includes an upper roll and an upper roll bearing housing. The upper roll is connected to the reducer via the coupling. The upper roll bearing housing is provided at both ends of the upper roll. The upper roll bearing housing is fixedly connected to the frame. The upper roll and the lower roll are arranged opposite to and parallel to each other. The gap between the upper roll and the lower roll is the roll gap.

[0020] Optionally, the frame is provided with a roller assembly and a sprocket assembly, which are located on the side of the roller gap. The roller assembly is used for electrode support, and the sprocket assembly is used to assist in threading the electrode.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The roller gap adjustment device provided by this utility model drives the lower roller assembly to rise and fall through the lifting component, thereby changing the roller gap width between the lower roller assembly and the upper roller assembly. The lower roller assembly rolls in contact with the frame through the rolling component, which reduces the running friction resistance of the lower roller assembly and allows for rapid adjustment of the roller gap size. This can effectively ensure the consistency of the electrode thickness after rolling, reduce the electrode defect rate, and improve the production efficiency of lithium battery electrodes. Attached Figure Description

[0023] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0024] Figure 1 This is a schematic diagram of an embodiment of the roll forming device with rapidly adjustable roll gap of this utility model;

[0025] Figure 2 This is a perspective view of an embodiment of the roller mill device with rapidly adjustable roller gap of this utility model;

[0026] Figure 3 This is a side view of an embodiment of the roll forming device with rapidly adjustable roll gap of this utility model;

[0027] Figure 4 This is a cross-section of an embodiment of the roll forming device with rapidly adjustable roll gap of this utility model. Figure 1 ;

[0028] Figure 5 This is a cross-section of an embodiment of the roll forming device with rapidly adjustable roll gap of this utility model. Figure 2 ;

[0029] Figure 6 This is a schematic diagram of the rolling assembly in an embodiment of the roll gap quick-adjustment device of this utility model. Figure 1 ;

[0030] Figure 7 This is a schematic diagram of the rolling assembly in an embodiment of the roll gap quick-adjustment device of this utility model. Figure 2 ;

[0031] Figure 8 This is a cross-sectional view of the rolling assembly in an embodiment of the roller gap adjustable rolling device of this utility model.

[0032] Figure label:

[0033] 100-Frame; 110-Front upright plate; 120-Rear upright plate; 130-Top screw; 200-Upper roll assembly; 210-Upper roll; 220-Upper roll bearing seat; 300-Lower roll assembly; 310-Lower roll; 320-Lower roll bearing seat; 321-Fixed backing plate; 400-Power assembly; 410-Motor; 420-Reducer; 430-Coupling; 500-Lifting assembly; 600-Rolling assembly; 610-Steel ball cover plate; 611-Through hole; 612-Counterhole; 620-Rolling steel ball; 630-Fixed plate; 631-Guide bar; 700-Overroller assembly; 800-Sprocket assembly. Detailed Implementation

[0034] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only. In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating relative importance or implying the number of indicated technical features. Thus, unless otherwise stated, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "multiple" means two or more. The term "comprising" and any variations thereof mean non-exclusive inclusion, where one or more other features, integers, steps, operations, units, components, and / or combinations thereof may be present or added.

[0035] Furthermore, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium, or as a connection within two components. All technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0036] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] like Figure 1-8 The diagram shown is a schematic representation of an embodiment of the roll gap adjustable device provided by this utility model.

[0038] Please refer to Figure 1-8 This embodiment is used for rolling electrode sheets, and mainly solves the technical problem that the roller gap cannot be quickly adjusted to control the electrode sheet thickness in the existing lithium-ion battery electrode sheet manufacturing process, resulting in defective products.

[0039] This embodiment includes a frame 100, an upper roll assembly 200, a lower roll assembly 300, a power assembly 400, and a lifting assembly 500, wherein the power assembly 400, the upper roll assembly 200, the lower roll assembly 300, and the lifting assembly 500 are disposed on the frame 100. The frame 100 includes a front upright plate 110 and a rear upright plate 120 arranged parallel to each other, which respectively support the two ends of the upper roll assembly 200 and the two ends of the lower roll assembly 300.

[0040] The power unit 400 is connected to the upper roll assembly 200 and the lower roll assembly 300. The upper roll assembly 200 and the lower roll assembly 300 are arranged opposite each other, and the gap between them is the roll gap. The lifting unit 500 acts on the lower roll assembly 300, causing the lower roll assembly 300 to move closer to or away from the upper roll assembly 200, thus changing the roll gap width. A rolling assembly 600 is provided between the lower roll assembly 300 and the frame 100. When the lower roll assembly 300 moves closer to or away from the upper roll assembly 200, it makes rolling contact with the frame 100 through the rolling assembly 600. The rolling assembly 600 achieves rolling friction when the lower roll assembly 300 moves relative to the frame 100. Compared with sliding friction, rolling friction has less frictional force, so the lower roll assembly 300 has a faster movement response speed.

[0041] In one embodiment, the lower roll assembly 300 includes a lower roll 310 and a lower roll bearing housing 320. The lower roll 310 is connected to the power assembly 400 for transmission, and lower roll bearing housings 320 are respectively provided at both ends of the lower roll 310. A rolling assembly 600 is provided between the contact surface of the lower roll bearing housing 320 and the frame 100, and the lower roll bearing housing 320 makes rolling contact with the frame 100 through the rolling assembly 600. Specifically, the lower roll bearing housing 320 makes rolling contact with the front upright plate 110 and the rear upright plate 120 through the rolling assembly 600. A lifting assembly 500 is provided below the lower roll bearing housing 320, and the lifting assembly 500 acts on the lower roll bearing housing 320. The lower roll bearing seats 320 on both sides are respectively distributed on the front vertical plate 110 and the rear vertical plate 120. The lower roll bearing seats 320 are used to support the lower roll 310 and to connect the lower roll 320 with the front vertical plate 110 and the rear vertical plate 120.

[0042] In one embodiment, the rolling assembly 600 includes a ball cover plate 610, rolling balls 620, and a fixing plate 630. The fixing plate 630 is connected to the frame 100, and is disposed opposite to and fixedly connected to the ball cover plate 610. The ball cover plate 610 is uniformly provided with a plurality of through holes 611 and countersunk holes 612 of a predetermined depth coaxially disposed with the through holes 611. The diameter of the countersunk hole 612 is larger than the diameter of the rolling ball 620, and the diameter of the through holes 611 is smaller than the diameter of the rolling ball 620. The rolling ball 620 is disposed in the countersunk hole 612 between the ball cover plate 610 and the fixing plate 630. The bottom of the rolling ball 620 is in rolling contact with the fixing plate 630, and the top of the rolling ball protrudes from the surface of the ball cover plate 610 through the through hole 611. The portion of the rolling ball 620 protruding from the surface of the ball cover plate 610 is in rolling contact with the lower roll bearing seat 320. The rolling steel balls 620 are confined between the fixed plate 630 and the lower roll bearing seat 320 by the steel ball cover plate 610. The rolling steel balls 620 achieve point contact rolling, thereby reducing the friction force when the lower roll bearing seat 320 is raised and lowered.

[0043] Furthermore, a set screw 130 is provided between the fixed plate 630 and the frame 100. The distance between the rolling assembly 600 and the lower roll bearing seat 310 is adjusted by the push-out force of the set screw 130, so that the rolling steel ball 620 contacts the lower roll bearing seat 310. Guide strips 631 are provided on the upper and lower sides of the fixed plate 630 respectively. In addition, the height of the rolling steel ball 620 protruding from the surface of the steel ball cover plate is 0.9-1.1mm, preferably 1mm.

[0044] Furthermore, fixed plates 321 are respectively provided on both sides of the lower roll bearing housing 320, and the fixed plates 321 make rolling contact with the rolling steel balls 620. The fixed plates 321 are made of wear-resistant material. By using fixed plates 321, the lower roll bearing housing 320 avoids direct contact with the rolling steel balls 620, thus reducing wear on the contact surface of the lower roll bearing housing 320. Furthermore, the replacement and maintenance of the fixed plates 321 are more convenient than those of the lower roll bearing housing 320, as they are in contact with the rolling steel balls 620.

[0045] Specifically, wear-resistant fixing plates 321 are installed on both outer sides of the lower roll bearing housing 320. The specific structure of the rolling assembly 600 on one side is as follows... Figure 6 As shown, the two sets of rolling components 600 are respectively installed on the same side of the front upright plate 110 and the rear upright plate 120 (e.g. Figure 4(As shown). The ball bearing cover 610 has multiple sets of through holes 611 and countersunk holes 612 of a certain depth. The through holes 611 and countersunk holes 612 are coaxial, and the diameter of the countersunk hole 612 is larger than the diameter of the rolling ball 620, while the diameter of the through hole 611 is slightly smaller than the diameter of the rolling ball 620. Multiple sets of high-precision, high-load-bearing rolling balls 620 are assembled between the fixed plate 630 and the ball bearing cover 610. The bottom of the rolling ball 620 makes point contact with the surface of the fixed plate 630, and the top of the rolling ball 620 protrudes 1 mm from the surface of the ball bearing cover 610. After the fixed plate 630 and the ball bearing cover 610 are locked, the rolling ball 620 can roll freely back and forth between the fixed plate 630 and the ball bearing cover 610 when under force, and the rolling ball 620 will not detach from the ball bearing cover 610. When the rolling assembly 600 is installed with the lower roll bearing housing 320, all the rolling steel balls 620 in the rolling assembly 600 press against the fixed plate 321 on the lower roll bearing housing 320, so that there are only a few point contacts of rolling steel balls 620 between the two.

[0046] The rolling assembly 600, which is fixed to the abutment plate 321 on the other side of the lower roll bearing housing 320, has the following specific structure: Figure 7 As shown. Two sets of rolling components 600 are respectively installed on the same side of the front upright plate 110 and the rear upright plate 120 (e.g.) Figure 5 (As shown). Compared with the other rolling assembly 600, this side rolling assembly 600 is provided with a set screw 130 on the fixed plate 630, and guide strips 631 are provided on the upper and lower sides for limiting. The set screw 130 is pushed in from the side of the front upright plate 110 and the rear upright plate 120 and contacts the fixed plate 630. Under the action of the push-out force of the set screw 130, the rolling assembly 600 moves towards the lower roll bearing seat 320, so that the rolling steel balls 620 push against the fixed plate 321 on the lower roll bearing seat 320. In this way, there are only a few point contacts between the rolling assembly 600 and the fixed plate 321. With the fixed plate 321 on the other side abutting against the rolling steel balls 620 of the rolling assembly 600, during the entire up and down movement of the lower roll assembly, in addition to gravity, there is only rolling friction resistance from both sides of the lower roll bearing seat 320.

[0047] In one embodiment, the lifting assembly 500 is a hydraulic system located below the lower roll bearing seat 320 and connected to the lower roll bearing seat 320, thereby driving the lower roll bearing seat 320 to rise and fall.

[0048] In one embodiment, the power assembly 400 includes a motor 410, a reducer 420, and a coupling 430. The motor 410 is specifically an independent variable frequency AC motor. The output end of the motor 410 is connected to the reducer 420, and both ends of the coupling 430 are respectively connected to the reducer 420 and the lower roll 310, or both ends of the coupling 430 are respectively connected to the reducer 420 and the upper roll 210 in the upper roll assembly 200.

[0049] In one embodiment, the upper roll assembly includes an upper roll 210 and an upper roll bearing housing 220. The upper roll 210 is connected to a reducer 420 via a coupling 430. Upper roll bearing housings 220 are respectively provided at both ends of the upper roll 210, and the upper roll bearing housings 220 are fixedly connected to the front upright plate 110 and the rear upright plate 120 of the frame 100. The upper roll 210 and the lower roll 310 are arranged opposite to and parallel to each other, and the gap between the upper roll 210 and the lower roll 310 is the roll gap.

[0050] In one embodiment, the frame 100 is provided with a roller assembly 700 and a sprocket assembly 800, which are located on the side of the roller gap. The roller assembly 700 is used to support the electrode sheets, allowing them to move along a predetermined path. The sprocket assembly 800 reduces manual threading by moving with the chain via a guide rod, assisting in threading the electrode sheets.

[0051] The working process of this adjustable roll gap rolling device embodiment is as follows:

[0052] When the equipment is running, the thickness measurement station after the main machine rolls the electrode sheet to detect its thickness. The entire thickness measurement system forms a closed loop with the hydraulic system, comparing the detected thickness with the set value. When the sensor detects that the thickness of the electrode sheet is not within the set range, it immediately sends a signal to the hydraulic system. The hydraulic station uses PID control to adjust the oil pressure, and the piston in the hydraulic cylinder rises and falls with the oil pressure, which drives the entire lower roll assembly to rise and fall. Since there is only point contact between the fixed plates on both sides of the lower roll assembly and the rolling assembly of the frame, the rolling friction resistance is very small. Therefore, the position of the entire lower roll assembly will also change immediately, ultimately changing the size of the roll gap between the upper roll assembly and the lower roll assembly, pressing the electrode sheet to the qualified thickness.

[0053] During the up-and-down movement of the lower roll assembly, the friction between the two sides of the lower roll bearing housing and the rolling steel balls is only a point of contact, which greatly reduces the running resistance and ensures the accuracy of the lower roll bearing housing in reciprocating motion. Corresponding to changes in working conditions, the hydraulic system can also quickly respond to adjust the size of the roll gap.

[0054] In summary, the embodiments provided by this utility model use a lifting assembly to drive the lower roller assembly to rise and fall, thereby changing the gap width between the lower roller assembly and the upper roller assembly. The lower roller assembly makes rolling contact with the frame through a rolling assembly, which reduces the frictional resistance of the lower roller assembly and allows for rapid adjustment of the gap size. This effectively ensures the consistency of the electrode thickness after rolling, reduces the electrode defect rate, and improves the production efficiency of lithium battery electrodes.

[0055] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A rolling device with rapidly adjustable roll gap, characterized in that, It includes a frame and a power assembly, an upper roll assembly, a lower roll assembly, and a lifting assembly disposed on the frame; The power assembly is connected to the upper and lower roll assemblies via a transmission. The upper roll assembly and the lower roll assembly are arranged opposite to each other, and the gap between the upper roll assembly and the lower roll assembly is the roll gap; the lifting assembly acts on the lower roll assembly, causing the lower roll assembly to move closer to or away from the upper roll assembly to change the roll gap width; A rolling assembly is provided between the lower roll assembly and the frame. When the lower roll assembly approaches or moves away from the upper roll assembly, it makes rolling contact with the frame through the rolling assembly.

2. The roll forming device with rapidly adjustable roll gap according to claim 1, characterized in that, The lower roll assembly includes a lower roll and a lower roll bearing housing. The lower roll is connected to the power assembly for transmission. The lower roll bearing housing is provided at both ends of the lower roll. A rolling assembly is provided between the contact surface of the lower roll bearing housing and the frame. The lower roll bearing housing makes rolling contact with the frame through the rolling assembly. A lifting assembly is provided below the lower roll bearing housing. The lifting assembly acts on the lower roll bearing housing.

3. The roll forming device with rapidly adjustable roll gap according to claim 2, characterized in that, The rolling assembly includes a steel ball cover plate, rolling steel balls, and a fixing plate. The fixing plate is connected to the frame and is disposed opposite to and fixedly connected to the steel ball cover plate. The ball bearing cover plate is uniformly provided with multiple through holes and countersunk holes of a predetermined depth coaxial with the through holes. The diameter of the countersunk hole is larger than the diameter of the rolling ball, and the diameter of the through hole is smaller than the diameter of the rolling ball. The rolling ball is disposed in the countersunk hole between the ball bearing cover plate and the fixing plate. The bottom of the rolling ball is in rolling contact with the fixing plate, and the top of the rolling ball protrudes from the surface of the ball bearing cover plate through the through hole. The part of the rolling ball protruding from the surface of the ball bearing cover plate is in rolling contact with the lower roll bearing seat.

4. The roll forming device with rapidly adjustable roll gap according to claim 3, characterized in that, A set screw is provided between the fixed plate and the frame. The distance between the rolling assembly and the lower roll bearing seat is adjusted by the push-out force of the set screw, so that the rolling steel ball contacts the lower roll bearing seat. Guide strips are provided on the upper and lower sides of the fixing plate.

5. The roll forming device with rapidly adjustable roll gap according to claim 3, characterized in that, The height of the rolling steel ball protruding from the surface of the steel ball cover plate is 0.9-1.1 mm.

6. The roll forming device with rapidly adjustable roll gap according to claim 3, characterized in that, The lower roll bearing housing is provided with fixed support plates on both sides, and the fixed support plates are in rolling contact with the rolling steel balls.

7. The roll forming device with rapidly adjustable roll gap according to claim 2, characterized in that, The lifting assembly is a hydraulic system, which is located below the lower roll bearing seat and connected to the lower roll bearing seat, driving the lower roll bearing seat to rise and fall.

8. The roll forming device with rapidly adjustable roll gap according to claim 2, characterized in that, The power assembly includes a motor, a reducer, and a coupling. The output end of the motor is connected to the reducer, and the two ends of the coupling are respectively connected to the reducer and the lower roll, or the two ends of the coupling are respectively connected to the reducer and the upper roll in the upper roll assembly.

9. The roll forming device with rapidly adjustable roll gap according to claim 8, characterized in that, The upper roll assembly includes an upper roll and an upper roll bearing housing. The upper roll is connected to the reducer via the coupling. The upper roll bearing housing is provided at both ends of the upper roll. The upper roll bearing housing is fixedly connected to the frame. The upper roll and the lower roll are arranged opposite to and parallel to each other. The gap between the upper roll and the lower roll is the roll gap.

10. The roll forming device with rapidly adjustable roll gap according to claim 1, characterized in that, The frame is equipped with a roller assembly and a sprocket assembly, which are located on the side of the roller gap. The roller assembly is used for electrode support, and the sprocket assembly is used to assist in threading the electrode.

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