A knife shaft assembly and a slitting machine using the same

Abstract

This utility model discloses a cutter shaft assembly and a slitting machine using the same. The cutter shaft assembly includes an upper cutter group and a lower cutter group arranged in pairs on a frame. The upper cutter group includes an upper cutter shaft rotatably mounted on the frame and multiple upper cutter rings spaced apart on the upper cutter shaft. The lower cutter group includes a lower cutter shaft rotatably mounted on the frame and multiple lower cutter rings spaced apart on the lower cutter shaft. Both the upper and lower cutter shafts are provided with liquid cooling channels for coolant circulation. The slitting machine includes a frame and a feeding roller group, a pinch roller, a slitting mechanism, and a separating guide mechanism mounted on the frame. The slitting mechanism includes the cutter shaft assembly as described above and a drive motor that is drively connected to the cutter shaft assembly. This utility model adopts a novel internal cooling method for the cutter shaft, using coolant circulation within the cutter shaft for cooling, solving the problems of tool performance degradation and strip processing quality deterioration caused by high temperatures, and providing a stable temperature environment for continuous strip slitting.

Description

Technical Field

[0001] This utility model belongs to the field of metal processing technology and relates to a device for continuously longitudinally slitting wide metal coils (steel, aluminum, copper, etc.) into multiple narrow strips, specifically a cutter shaft assembly and a slitting machine using it. Background Technology

[0002] The core function of a slitting machine is to continuously and longitudinally slit wide metal coils (such as steel strips, aluminum strips, copper strips, etc.) into multiple narrow strips. Its blade system is key to achieving precise, stable, and efficient slitting, comprising a pair of upper and lower blade groups that move relative to each other. Based on the principles of shear mechanics, when the material passes between these rotating blade groups, the upper blade group "cuts" downwards into the material, while the lower blade group "supports" upwards and also "cuts" into the material. The shearing point formed by the two cutting edges of the upper and lower blade groups subjects the material to strong shear stress, thus cutting it.

[0003] Due to the need for continuous high-speed slitting, the slitting machine's blade assembly generates high temperatures during operation. These high temperatures can lead to tool performance degradation, such as edge softening due to tempering, edge chipping, and coating peeling; they can also cause a deterioration in material processing quality, such as a decrease in yield strength and the formation of "burrs" during shearing. Current technologies typically employ cutting fluid cooling or forced air cooling to cool the blade assembly, but both methods have certain drawbacks, as detailed below:

[0004] (1) Cooling method of cutting fluid: Spraying cutting fluid onto the tool set to cool it down will reduce the effective engagement between the cutting edge of the tool set and the material. If the material is a thin strip, it is easy to slip and wrinkle during slitting. On the other hand, there is a risk of material contamination. For copper / aluminum strip, water-based cutting fluid is prone to causing oxidation spots (white spots on the surface of aluminum and green rust on copper). For silicon steel / electrical steel strip, the insulation will fail when the iron core is stacked with residual liquid stains. Furthermore, when the strip enters the annealing furnace, the residual liquid stains will carbonize and form stains.

[0005] (2) Forced air cooling: There is a problem of insufficient cooling depth. When cutting at high speed, the air cooling effect is poor and cannot suppress heat accumulation. Furthermore, when the air pressure is too high, it may cause the strip to tear. Utility Model Content

[0006] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a cutter shaft assembly and a slitting machine using the same, so as to effectively control the temperature of the cutter shaft assembly and thereby improve slitting efficiency and slitting quality.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a cutter shaft assembly, comprising an upper cutter group and a lower cutter group arranged in pairs on a frame; the upper cutter group includes an upper cutter shaft rotatably mounted on the frame and a plurality of upper cutter rings spaced apart on the upper cutter shaft; the lower cutter group includes a lower cutter shaft rotatably mounted on the frame and a plurality of lower cutter rings spaced apart on the lower cutter shaft; the cutting edges of the upper cutter rings and the cutting edges of the lower cutter rings overlap radially and have a side clearance axially; both the upper cutter shaft and the lower cutter shaft are provided with liquid cooling channels for coolant circulation, the liquid cooling channels including a shaft inlet channel and at least one return channel communicating with the shaft inlet channel.

[0008] As a limitation of this utility model, the return water channel is a spiral water channel with a circular cross-section.

[0009] As another limitation of this utility model, the ends of the upper cutter shaft and the lower cutter shaft are both equipped with rotary joints, the water inlet channel of the rotary joint is connected to the water inlet channel of the shaft, and the drainage channel of the rotary joint is connected to the return water channel.

[0010] As a further limitation of this utility model, the rotary joint is an H-type dual-pass rotary joint.

[0011] As a third limitation of this utility model, the upper cutter shaft and the lower cutter shaft achieve synchronous rotation through gear meshing.

[0012] As a further limitation of this utility model, the two ends of the upper cutter shaft are rotatably mounted on the frame via a first bearing with a seat, and the two ends of the lower cutter shaft are rotatably mounted on the frame via a second bearing with a seat.

[0013] The first mounted bearing is a sliding adjustable mounted bearing.

[0014] As a further limitation of this utility model, the upper cutter shaft is equipped with a plurality of upper spacers for determining the axial distance between adjacent upper cutter rings; the lower cutter shaft is equipped with a plurality of lower spacers for determining the axial distance between adjacent lower cutter rings.

[0015] This utility model also discloses a slitting machine, including the frame, and a feeding roller group, a clamping roller, a slitting mechanism and a separating guide mechanism sequentially assembled on the frame along the feeding direction; the slitting mechanism includes the cutter shaft assembly as described above, and a drive motor that is pulsatorically connected to the cutter shaft assembly.

[0016] As a limitation of this utility model, the pinch roller includes an upper pinch roller and a lower pinch roller arranged in pairs, and the lower pinch roller is drivenly connected to the lower cutter shaft.

[0017] As a further limitation of this utility model, the separating and guiding mechanism includes a separating roller and a guiding roller, and a plurality of separating partitions are spaced apart on the separating roller; each pair of adjacent separating partitions forms a separating groove on the separating roller.

[0018] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0019] (1) In this utility model, the cutter shaft assembly adopts a brand-new internal cooling method. Specifically, a precision liquid cooling channel is constructed inside the cutter shaft. After a dedicated external coolant circulation system (such as a circulation pump) injects a coolant with high specific heat capacity and low viscosity into the liquid cooling channel, the heat generated during slitting can be quickly transferred to the coolant in the liquid cooling channel. The coolant carries away the heat quickly through circulation, thereby achieving the purpose of cooling the cutter shaft assembly. This utility model can solve the problems of tool performance degradation and strip processing quality deterioration caused by high temperature. It can provide a stable temperature environment for continuous slitting of ultra-high-speed strip, thereby improving processing accuracy and extending tool life.

[0020] (2) The present invention rationally plans the layout of the liquid cooling channel, specifically adopting a spiral layout (i.e., spiral water channel), which can maximize the heat dissipation effect, so that the coolant can uniformly cool the entire cutter shaft and avoid local overheating. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a front view showing the structural relationship of the cutter shaft assembly in this embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the upper cutter shaft in an embodiment of the present invention;

[0024] Figure 3 This is a perspective view showing the structural relationship of the liquid cooling channel in the upper cutter shaft in an embodiment of this utility model;

[0025] Figure 4 This is a cross-sectional view showing the structural relationship of the upper cutter shaft in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the slitting machine in an embodiment of the present invention, where the arrows indicate the feeding direction.

[0027] Figure 6 This is a schematic diagram of the slitting machine from another angle in an embodiment of this utility model;

[0028] In the diagram: 1. Upper cutter assembly; 2. Lower cutter assembly; 3. Keyway; 4. Liquid cooling channel; 5. Shaft inlet channel; 6. Return channel; 7. Rotary joint; 8. Feed roller assembly; 9. Pinch roller; 10. Cutter shaft assembly; 11. Drive motor; 12. Distributing roller; 13. Guide roller; 14. Distributing partition plate;

[0029] 101. Upper cutter shaft; 102. Upper cutter ring; 103. Upper spacer;

[0030] 201. Lower cutter shaft; 202. Lower cutter ring; 203. Lower spacer sleeve;

[0031] 301. Upper pinch roller; 302. Lower pinch roller. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0033] This embodiment discloses a cutter shaft assembly 10 used in a slitting machine, which is a key component of the slitting machine for continuously longitudinally slitting wide metal coils into multiple narrow strips. For example... Figure 1 As shown, the cutter shaft assembly 10 disclosed in this embodiment includes an upper cutter group 1 and a lower cutter group 2 that are arranged in pairs and move relative to each other.

[0034] The upper tool assembly 1 includes an upper tool shaft 101, multiple upper tool rings 102, and multiple upper spacers 103.

[0035] The upper cutter shaft 101 is the core support and power transmission component of the upper cutter assembly 1. It carries all components such as the upper cutter ring 102 and the upper spacer 103, and is mounted on the slitting machine frame via bearings. In this embodiment, both ends of the upper cutter shaft 101 are rotatably mounted on the frame via first seated bearings, and the first seated bearings are existing sliding adjustable seated bearings. The sliding adjustable seated bearing has opposing slideways on both sides of the bearing seat, and a screw is rotatably connected to the top. The sliding adjustable seated bearing is slidably mounted on the frame via the slideways, and the screw of the sliding adjustable seated bearing is threaded onto the frame. Rotating the screw allows the sliding adjustable seated bearing to slide up and down along the frame, thereby adjusting the distance between the upper cutter shaft 101 and the lower cutter shaft 201. Figure 2 As shown, a keyway 3 is provided on the upper cutter shaft 101 along the length direction for fixing the upper cutter ring 102 and the upper spacer 103.

[0036] The upper cutter ring 102 is an existing structure and is a ring-shaped cutter that directly participates in the shearing operation. Each upper cutter ring 102 is sleeved on the upper cutter shaft 101 and rotates synchronously with the upper cutter shaft 101 by means of the key and keyway 3. In this embodiment, there are three upper cutter rings 102, which are evenly distributed on the upper cutter shaft 101.

[0037] The upper spacer 103 is an annular sleeve used to precisely determine the axial distance between two adjacent upper cutter rings 102, thereby determining the width of the slitting narrow strip. The upper spacer 103 is sleeved on the upper cutter shaft 101, and one upper spacer 103 is provided between every two adjacent upper cutter rings 102. In practice, multiple sets of upper spacers 103 are usually configured, each set of upper spacers 103 has a fixed length, and the strip width is set by combining upper spacers 103 of different lengths. In this embodiment, each set of upper spacers 103 includes three upper spacers 103.

[0038] The lower tool assembly 2 includes a lower tool shaft 201, multiple lower tool rings 202, and multiple lower spacers 203. Its specific structure is identical to that of the upper tool assembly 1 described above, and will not be repeated in this embodiment. It should be noted that the two ends of the lower tool shaft 201 are rotatably mounted on the frame via second mounted bearings, which are conventional mounted bearings in the prior art. After assembling the upper tool assembly 1 and the lower tool assembly 2 on the frame, the upper tool ring 102 and the lower tool ring 202 correspond one-to-one, and the cutting edges of the upper tool ring 102 and the lower tool ring 202 overlap radially and have a side clearance axially. This side clearance... Figure 1 It cannot be observed in the middle.

[0039] like Figure 1 As shown, the first end of the upper cutter shaft 101 and the first end of the lower cutter shaft 201 are driven by gear meshing. In practice, the upper cutter shaft 101 or the lower cutter shaft 201 is driven to rotate by a drive component (such as a motor), and the two achieve synchronous relative rotation.

[0040] Furthermore, both the upper toolshaft 101 and the lower toolshaft 201 employ internal cooling. Taking the upper toolshaft 101 as an example, as... Figures 2 to 4 As shown, the upper cutter shaft 101 is provided with a liquid cooling channel 4 for coolant circulation. This liquid cooling channel 4 includes a central water inlet channel 5 extending along the central axis of the upper cutter shaft 101 and at least one return water channel 6 communicating with the central water inlet channel 5. The return water channels 6 are spirally distributed within the upper cutter shaft 101 and are circular spiral channels. In this embodiment, five parallel and wound return water channels 6 are included.

[0041] The second end of the upper cutter shaft 101 is equipped with a rotary joint 7, which is an H-type dual-pass rotary joint 7 in the prior art, having a water inlet channel and a drainage channel, wherein the water inlet channel is connected to the axial water inlet channel 5 of the upper cutter shaft 101, and the drainage channel is connected to the water return channel 6 of the upper cutter shaft 101.

[0042] In actual use, by connecting to an external coolant circulation system through the rotary joint 7, the coolant can circulate inside the upper cutter shaft 101, thereby cooling the upper cutter shaft 101, the upper shaft sleeve, and the upper cutter ring 102.

[0043] This embodiment also discloses a slitting machine, which has a structure basically the same as that of existing slitting machines, except that it uses the cutter shaft assembly 10 as described above. Figure 5 and Figure 6 As shown, the slitting machine disclosed in this embodiment includes a frame and a feeding roller group 8, a clamping roller 9, a slitting mechanism, and a separating and guiding mechanism, which are sequentially assembled on the frame along the feeding direction.

[0044] Specifically, the feeding roller group 8 includes multiple idler rollers that are mounted side by side and rotate on the frame. In this embodiment, a total of seven idler rollers are provided.

[0045] The pinch roller 9 is used to ensure that the unwound roll material is smoothly and accurately fed into the slitting mechanism. It includes an upper pinch roller 301 and a lower pinch roller 302 arranged in pairs. Both the upper pinch roller 301 and the lower pinch roller 302 are rotatably mounted on the frame. The second end of the lower pinch roller 302 is connected to the second end of the lower cutter shaft 201 in the slitting mechanism via a sprocket and chain. When the lower cutter shaft 201 rotates, it can drive the lower pinch roller 302 to rotate synchronously.

[0046] The slitting mechanism includes the cutter shaft assembly 10 as described above, and a drive motor 11 that is connected to the cutter shaft assembly 10 in a transmission manner. In this embodiment, the drive motor 11 is connected to the first end of the lower cutter shaft 201 in a transmission manner through a sprocket and chain, so as to drive the lower cutter shaft 201, the upper cutter shaft 101 and the lower clamping roller 302 mentioned above to rotate.

[0047] The separating and guiding mechanism is used to separate the multiple narrow strips formed after being cut by the slitting mechanism, preventing them from becoming misaligned and entangled. For example... Figure 6 As shown, the separating and guiding mechanism includes a distributing roller 12 and a guiding roller 13 rotatably mounted on the frame. The distributing roller 12 is equipped with multiple distributing partitions 14 spaced apart. Each pair of adjacent distributing partitions 14 forms a separating groove on the distributing roller 12, and the width of the separating groove is adapted to the width of the narrow strip. In this embodiment, four separating grooves are formed on the distributing roller.

[0048] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cutter shaft assembly, comprising an upper cutter group and a lower cutter group arranged in pairs on a frame; the upper cutter group includes an upper cutter shaft rotatably mounted on the frame and a plurality of upper cutter rings spaced apart on the upper cutter shaft; the lower cutter group includes a lower cutter shaft rotatably mounted on the frame and a plurality of lower cutter rings spaced apart on the lower cutter shaft; the cutting edges of the upper cutter rings and the cutting edges of the lower cutter rings overlap radially and have a side clearance axially; characterized in that: Both the upper and lower cutter shafts are provided with liquid cooling channels for coolant circulation. Each liquid cooling channel includes a shaft inlet channel and at least one return channel connected to the shaft inlet channel.

2. The cutter shaft assembly according to claim 1, characterized in that: The return water channel is a spiral water channel with a circular cross-section.

3. The cutter shaft assembly according to claim 1 or 2, characterized in that: Both the upper and lower cutter shafts are equipped with rotary joints at their ends. The water inlet channel of the rotary joint is connected to the water inlet channel of the shaft, and the drainage channel of the rotary joint is connected to the return channel.

4. The cutter shaft assembly according to claim 3, characterized in that: The rotary joint is an H-type dual-pass rotary joint.

5. The cutter shaft assembly according to any one of claims 1, 2, and 4, characterized in that: The upper and lower cutter shafts rotate synchronously through gear meshing.

6. The cutter shaft assembly according to claim 5, characterized in that: The upper cutter shaft is rotatably mounted on the frame at both ends via a first bearing seat, and the lower cutter shaft is rotatably mounted on the frame at both ends via a second bearing seat. The first mounted bearing is a sliding adjustable mounted bearing.

7. The cutter shaft assembly according to claim 6, characterized in that: The upper cutter shaft is equipped with a plurality of upper spacers for determining the axial distance between adjacent upper cutter rings; the lower cutter shaft is equipped with a plurality of lower spacers for determining the axial distance between adjacent lower cutter rings.

8. A slitting machine, comprising the frame, and a feeding roller group, a clamping roller, a slitting mechanism, and a separating and guiding mechanism sequentially assembled on the frame along the feeding direction; characterized in that: The slitting mechanism includes a cutter shaft assembly as described in any one of claims 1-7, and a drive motor that is pulsatorically connected to the cutter shaft assembly.

9. The slitting machine according to claim 8, characterized in that: The pinch rollers include an upper pinch roller and a lower pinch roller arranged in pairs, and the lower pinch roller is drivenly connected to the lower cutter shaft.

10. The slitting machine according to claim 9, characterized in that: The separating and guiding mechanism includes a separating roller and a guiding roller. Multiple separating partitions are spaced apart on the separating roller. Each pair of adjacent separating partitions forms a separating groove on the separating roller.

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