Aluminum bar cutting equipment

By designing the pressing component and material handling mechanism of the aluminum rod cutting equipment, the automatic recycling of tail material was achieved, solving the problem of high labor intensity caused by manual removal of tail material and improving production efficiency and safety.

CN223916774UActive Publication Date: 2026-02-17HUBEI DONGJIANG NEW ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202520590929.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-01
Publication Date
2026-02-17
Estimated Expiration
2035-04-01

AI Technical Summary

Technical Problem

Existing aluminum rod cutting equipment requires manual removal of tailings during the cutting process, resulting in high labor intensity and reduced production efficiency.

Method used

An aluminum rod cutting device was designed. The aluminum rod is fixed and cut by the first and second pressing components. The tail material is moved to the right side of the collection tank by the second pressing component and pushed into the collection tank by the material picking mechanism for unified recycling.

Benefits of technology

It reduces manual operation, improves production efficiency, and ensures equipment safety and cutting quality.

✦ Generated by Eureka AI based on patent content.

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    Figure CN223916774U_ABST
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Abstract

The utility model provides aluminum bar cutting equipment which comprises a body, a workbench is arranged at the front end of the body, a collecting groove is formed in the upper end of the workbench, the lower end of the cutting groove is communicated with a collecting frame, the collecting frame capable of being pulled out is arranged at the front end of the body, the lower end of the collecting groove is communicated with the collecting frame, and the workbench is provided with the cutting groove on the left side of the collecting groove. A cutting machine is arranged in the main body, the workbench is provided with a first pressing assembly on the left side of the cutting groove, a second pressing assembly is arranged in the cutting groove, the second pressing assembly moves left and right through a moving mechanism, the moving mechanism is arranged in the main body, and a material taking mechanism is arranged on the right side in the collecting groove and can push waste on the second pressing assembly into the collecting groove. And the tailings are moved to the right side of the collecting tank through the second pressing assembly, and then the tailings on the second pressing assembly are pushed into the collecting tank through the material taking mechanism, so that the tailings are conveniently and uniformly recycled, the use of manpower is reduced, the working efficiency is improved, and the construction safety is ensured.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to cutting equipment technical field relates to a kind of aluminium bar cutting equipment. BACKGROUND

[0002] With the development of modern industry, aluminum materials are widely used in many fields due to their light weight, strong corrosion resistance, and good electrical conductivity and thermal conductivity. In manufacturing industry, aluminum rods are one of the raw materials, and their processing demand is increasing. Aluminum rod cutting is one of the key steps in aluminum material processing, which is used to cut long aluminum rods into the required length specifications. In order to improve production efficiency and product quality, various automatic aluminum rod cutting equipment has emerged.

[0003] With the development of modern industry, aluminum materials are widely used in many fields due to their light weight, strong corrosion resistance, and good electrical conductivity and thermal conductivity. In manufacturing industry, aluminum rods are one of the raw materials, and their processing demand is increasing. Aluminum rod cutting is one of the key steps in aluminum material processing, which is used to cut long aluminum rods into the required length specifications. In order to improve production efficiency and product quality, various automatic aluminum rod cutting equipment has emerged. However, during the cutting process, when the aluminum rod approaches the end, the tail material needs to be removed due to quality problems. If it is directly discharged, it will mix with qualified products, which is more difficult to sort out in the later stage, especially when the size difference is small. The existing equipment can only manually remove the tail material during use, which increases labor intensity and reduces production efficiency. SUMMARY

[0004] The utility model aims at providing a kind of aluminium bar cutting equipment, it aims at solving the problem of high labor intensity caused by manual removal of tail material and reducing production efficiency.

[0005] To solve the above technical problems, the utility model provides an aluminum rod cutting equipment, which comprises a main body, a workbench is opened at the front end of the main body, a collecting groove is arranged at the upper end of the workbench, an extractable collecting frame is arranged at the front end of the main body, the lower end of the collecting groove is communicated with the collecting frame, a cutting groove is opened at the left side of the workbench and the collecting groove, the lower end of the cutting groove is communicated with the collecting frame, a cutting machine that can move forward and backward is arranged in the main body, the blade on the cutting machine moves forward and backward in the cutting groove, a first pressing assembly is arranged at the left side of the workbench and the cutting groove, a second pressing assembly is arranged in the cutting groove, the second pressing assembly moves left and right through a moving mechanism, the moving mechanism is arranged in the main body, a material taking mechanism is arranged at the right side in the collecting groove, and the material taking mechanism can push the waste material on the second pressing assembly into the collecting groove.

[0006] The first pressing assembly and the second pressing assembly are used for pressing and fixing the plurality of aluminum bars, and then the cutting machine is used for cutting the aluminum bars from the cutting groove.

[0007] The first pressing assembly further comprises a moving plate, a first cylinder, a first supporting frame, a second cylinder, a first sliding rod, a first supporting plate and a first pressing plate, the moving plate is slidably connected to the upper end of the workbench, the moving plate is located at the left side of the cutting groove, the first cylinder is arranged in the main body, the first cylinder drives the moving plate to slide leftward and rightward, the first supporting frame is in the shape of "n" and is arranged at the upper end of the workbench in a front-to-back direction, the two ends of the first supporting frame are connected to the front and back of the upper end of the moving plate, the second cylinder is vertically arranged at the middle of the upper end of the first supporting frame, the output shaft of the second cylinder penetrates through the first supporting frame and is connected to the first supporting plate, the first pressing plate is detachably arranged at the lower end of the first supporting plate, and the first sliding rod is arranged in two and vertically inserted into the upper end of the first supporting frame in a front-to-back symmetrical manner.

[0008] The moving plate can support the aluminum bars, and the first pressing plate on the second cylinder is used for pressing and fixing the aluminum bars, after cutting, the moving plate can move leftward, and the cut aluminum bars are slightly moved leftward, so that the cutting blade is prevented from being damaged by collision with the aluminum bars.

[0009] The second pressing assembly further comprises a supporting seat, a backing plate, a second sliding rod, a third cylinder, a second supporting frame, a fourth cylinder, a third sliding rod, a second supporting plate and a second pressing plate, the supporting seat is arranged in the collecting groove in a front-to-back direction, the supporting seat is connected to the moving mechanism, the third cylinder is arranged in the supporting seat, the backing plate is arranged at the upper end of the supporting seat, the output shaft of the third cylinder is connected to the backing plate, the upper end of the second sliding rod is connected to the backing plate, the lower end of the second sliding rod is slidably connected to the supporting seat, the second supporting frame is in the shape of "n" and is arranged at the upper end of the supporting seat in a front-to-back direction, the two ends of the second supporting frame are connected to the front and back of the upper end of the supporting seat, the fourth cylinder is vertically arranged at the middle of the upper end of the second supporting frame, the output shaft of the fourth cylinder penetrates through the second supporting frame and is connected to the second supporting plate, the second pressing plate is detachably arranged at the lower end of the second supporting plate, and the third sliding rod is arranged in two and vertically inserted into the upper end of the second supporting frame in a front-to-back symmetrical manner.

[0010] The aluminum bars located at the collecting groove can be supported through the support base, the backing plate, the second sliding rod and the third cylinder, the third cylinder can adjust the height of the aluminum bars, mainly when the tail material is taken out, the taking mechanism needs to be arranged to be lower, the height of the backing plate is reduced, and therefore the taking mechanism is facilitated to work.

[0011] The taking mechanism further comprises a push plate, the push plate is arranged at the right side in the collecting groove, the position of the push plate is lower than the upper end of the moving plate, and the push plate can push the waste on the second pressing assembly into the collecting groove.

[0012] When the second pressing assembly moves to the right side of the collecting groove with the tail material, the fifth cylinder pushes the push plate, the second pressing plate is lifted, and the tail material on the backing plate is pushed into the collecting groove.

[0013] The right side of the second support frame is provided with a fifth cylinder, the fifth cylinder is installed on the support frame in the front-rear direction, and the output shaft of the fifth cylinder is directed to the rear end and detachably installed with a limiting plate.

[0014] The fifth cylinder works, the aluminum bars can be extruded rearward by means of the limiting plate, the aluminum bars are tightly attached, and the cutting machine is facilitated to cut.

[0015] The upper end of the workbench is provided with a mounting groove at the right side of the collecting groove, the mounting groove is provided with an alignment block, the lower end of the alignment block is provided with a sixth cylinder, the output shaft of the sixth cylinder is connected to the alignment block, and the sixth cylinder drives the alignment block to slide up and down.

[0016] When new material enters, the alignment block is lifted, the aluminum bars are arranged on the right side of the alignment block, the left ends of the aluminum bars are flush, the alignment block is retracted, the aluminum bars are pushed into the upper end of the collecting groove and fixed by the second pressing assembly, and subsequent cutting work is facilitated.

[0017] The upper end of the alignment block is provided with a roller shaft in the front-rear direction, and the upper end of the roller shaft is flush with the upper end of the moving plate.

[0018] After the alignment block aligns the aluminum bars, the alignment block can be retracted into the mounting groove, and then the roller shaft is used as a supporting point, so that the aluminum bars are facilitated to feed.

[0019] Compared with the prior art, the aluminum bar cutting equipment provided by the utility model has the advantages that the tail material is moved to the right side of the collecting groove through the second pressing assembly, the tail material on the second pressing assembly is pushed into the collecting groove through the material taking mechanism, unified recycling of the tail material is facilitated, the use of manual labor is reduced, work efficiency is improved, and construction safety is ensured.

[0020] The moving plate in the utility model can move left after cutting is completed, the second pressing assembly can move left, a gap is generated between the aluminum bar and the blade, the blade is conveniently recycled, the blade and the aluminum bar are ensured from being damaged due to mutual contact, and the second pressing assembly can directly catch new material after moving to the right side of the collecting groove and taking off the tail material, cutting of the next aluminum bar is facilitated, and work efficiency is improved.

[0021] When the utility model is used, if new material comes in, the adjusting block is lifted, each aluminum bar is placed on the right side of the adjusting block, the left end of the aluminum bar is leveled, the adjusting block is retracted, and the aluminum bar is moved on the roller shaft, so that the aluminum bar feeding is facilitated. DRAWINGS

[0022] Figure 1 is the overall structure schematic view of the aluminum bar cutting equipment one embodiment of the utility model;

[0023] Figure 2 is the sectional view of the fixed assembly in the aluminum bar cutting equipment one embodiment of the utility model;

[0024] Figure 3 is the aluminum bar cutting equipment one embodiment of the utility model Figure 2 is the enlarged view of A;

[0025] Figure 4 is the sectional view of the lower support seat in the aluminum bar cutting equipment one embodiment of the utility model.

[0026] 1, main body; 11, workbench; 12, collecting groove; 13, collecting frame; 14, cutting groove; 15, mounting groove; 16, cutting machine; 17, moving mechanism; 2, first pressing assembly; 21, moving plate; 22, first cylinder; 23, first support frame; 24, second cylinder; 25, first sliding rod; 26, first support plate; 27, first pressing plate; 3, second pressing assembly; 31, support seat; 32, pad plate; 33, second sliding rod; 34, third cylinder; 35, second support frame; 36, fourth cylinder; 37, third sliding rod; 38, second support plate; 39, second pressing plate; 4, material taking mechanism; 41, push plate; 5, fifth cylinder; 51, limiting plate; 6, adjusting block; 61, sixth cylinder; 62, roller shaft. CONCRETE IMPLEMENTATION

[0027] The aluminum bar cutting equipment provided by the utility model will be further described in detail in connection with the drawings and specific embodiments. The advantages and features of the utility model will be clearer according to the following description. It should be noted that the drawings are all in a very simplified form and all use non-precise proportions, and are only used to facilitate and clearly assist the purpose of describing the embodiments of the utility model. The same or similar reference signs in the drawings represent the same or similar parts.

[0028] The aluminum bar cutting equipment provided by the utility model comprises a main body 1, the front end of the main body 1 is provided with a workbench 11, the upper end of the workbench 11 is provided with a collecting groove 12, the front end of the main body 1 is provided with a collecting frame 13 which can be pulled out, the lower end of the collecting groove 12 is communicated with the collecting frame 13, the workbench 11 is provided with a cutting groove 14 at the left side of the collecting groove 12, the lower end of the cutting groove 14 is communicated with the collecting frame 13, the main body 1 is provided with a cutting machine 16 which can move forward and backward, the blade on the cutting machine 16 moves forward and backward in the cutting groove 14, the workbench 11 is provided with a first pressing assembly 2 at the left side of the cutting groove 14, the cutting groove 14 is provided with a second pressing assembly 3, the second pressing assembly 3 moves left and right through a moving mechanism 17, the moving mechanism 17 is arranged in the main body 1, the right side in the collecting groove 12 is provided with a material taking mechanism 4, the material taking mechanism 4 can push the waste on the second pressing assembly 3 into the collecting groove 12. Wherein the main body 1, the cutting machine 16 and the moving mechanism 17 all belong to common products on the market, and will not be described in detail in the embodiment. The first pressing assembly 2 and the second pressing assembly 3 are mainly used for pressing and fixing a plurality of aluminum bars, and then the cutting machine 16 cuts the aluminum bars from the cutting groove 14, so that a plurality of aluminum bars can be cut at the same time, and the cutting efficiency is high. The second pressing assembly 3 can move left and right under the driving of the moving mechanism 17, so that the function of quantitative feeding can be achieved. When only tail material is pressed on the second pressing assembly 3, the tail material can be pushed into the collecting groove 12 by the material taking mechanism 4, and the tail material can be conveniently recycled through the collecting frame 13. Of course, the collecting frame 13 can also be used for collecting cutting debris falling into the collecting groove 12 and the cutting groove 14.

[0029] The first pressing assembly 2 includes a movable plate 21, a first cylinder 22, a first support frame 23, a second cylinder 24, a first slide rod 25, a first support plate 26, and a first pressing plate 27. The movable plate 21 is slidably connected to the upper end of the workbench 11 and is located on the left side of the cutting groove 14. The first cylinder 22 is located inside the main body 1 and drives the movable plate 21 to slide left and right. The first support frame 23 is in an "n" shape and is located at the upper end of the workbench 11 with its front and back facing each other. The two ends of the first support frame 23 are connected to the front and back sides of the upper end of the movable plate 21. The second cylinder 24 is vertically located at the middle of the upper end of the first support frame 23. The output shaft of the second cylinder 24 passes through the first support frame 23 and is connected to the first support plate 26. The first pressing plate 27 is detachably installed at the lower end of the first support plate 26. The first slide rod 25 has two rods that are symmetrically inserted vertically into the upper end of the first support frame 23. The lower end of the first slide rod 25 is connected to the first support plate 26. The first support frame 23, the second cylinder 24, the first slide bar 25, the first support plate 26, and the first pressing plate 27 are common structures. The power generated by the second cylinder 24 presses the left end of the aluminum rod onto the moving plate 21. After cutting, the first pressing plate 27 is released first, and then moved to the left to move the cut aluminum rod slightly to the left to avoid colliding with the blade moving backward and damaging the blade and the aluminum rod.

[0030] The second pressing assembly 3 includes a support base 31, a pad 32, a second slide rod 33, a third cylinder 34, a second support frame 35, a fourth cylinder 36, a third slide rod 37, a second support plate 38, and a second pressing plate 39. The support base 31 is arranged in the collection groove 12 with its front and rear facing directions. The support base 31 is connected to the moving mechanism 17. The third cylinder 34 is located inside the support base 31. The pad 32 is located at the upper end of the support base 31. The output shaft of the third cylinder 34 is connected to the pad 32. The upper end of the second slide rod 33 is connected to the pad 32, and the lower end of the second slide rod 33 is slidably connected to the support frame 35. The second support frame 35 is in an "n" shape and is positioned at the upper end of the support base 31. The two ends of the second support frame 35 are connected to the front and rear sides of the upper end of the support base 31. The fourth cylinder 36 is vertically positioned at the middle of the upper end of the second support frame 35. The output shaft of the fourth cylinder 36 passes through the second support frame 35 and is connected to the second support plate 38. The second pressing plate 39 is detachably installed at the lower end of the second support plate 38. Two third sliding rods 37 are provided and are vertically inserted into the upper end of the second support frame 35 in a symmetrical manner. The lower end of the third sliding rods 37 is connected to the second support plate 38. The second pressing assembly 3 works on a similar principle to the first pressing assembly 2. It primarily uses the second support frame 35, the fourth cylinder 36, the third slide rod 37, the second support plate 38, and the second pressing plate 39 to press and fix the aluminum rod onto the pad 32. However, the difference lies in that the pad 32 can also be raised and lowered via the support base 31, the second slide rod 33, and the third cylinder 34. This facilitates movement of the aluminum rod at both ends, allowing for quantitative feeding of the aluminum rod in conjunction with the moving mechanism 17. Secondly, it facilitates the lowering of the waste material, making it easier to use with the lower-positioned material-collecting mechanism 4. The material-collecting mechanism 4 includes a push plate 41, located on the right side of the collection trough 12, positioned lower than the upper end of the moving plate 21 to avoid affecting the movement of the aluminum rod during feeding. With the extension of the fifth cylinder 5, the push plate 41 can push the waste material from the second pressing assembly 3 into the collection trough 12.

[0031] To ensure that the aluminum rods fit together, a fifth cylinder 5 is provided on the right side of the second support frame 35. The fifth cylinder 5 is mounted on the support frame with its front and back facing each other. The output shaft of the fifth cylinder 5 faces the rear end and a limit plate 51 can be detachably installed. The limit plate 51 can be pushed backward by the fifth cylinder 5 to push the aluminum rods together. Of course, the fifth cylinder 5 and the second pressing component 3 can move together to facilitate position adjustment.

[0032] The upper end of the workbench 11 has an installation groove 15 on the right side of the collection tank 12. An alignment block 6 is installed in the installation groove 15. A sixth cylinder 61 is installed at the lower end of the alignment block 6, and the output shaft of the sixth cylinder 61 is connected to the alignment block 6, causing the alignment block 6 to slide up and down. A front-to-back oriented roller 62 is installed at the upper end of the alignment block 6, with the upper end of the roller 62 at the same height as the upper end of the moving plate 21. When new material arrives, the alignment block 6 is raised, allowing each aluminum rod to rest on the right side of the alignment block 6, aligning the left ends of the aluminum rods. Then, the alignment block 6 is retracted, and the roller 62 serves as a support point to facilitate the feeding of aluminum rods.

[0033] Of course, it should be noted that this device needs to be used in conjunction with existing feeding mechanisms, replenishing mechanisms and other detection structures during use, but these are all existing technologies and will not be elaborated on. This device is not only used for cutting aluminum bars, but can also be used for cutting other materials.

[0034] Workflow: The feeding mechanism places multiple aluminum rods onto the feeding mechanism. First, the left end of the aluminum rods is aligned using the alignment block 6. The aluminum rods continue to be fed, and the left end is pressed and fixed by the second pressing component 3. The rods are then moved to the cutting slot 14 to cut the head end of the aluminum rods. The head end is cut in small quantities to reduce waste. Then, the aluminum rods are quantitatively fed to the left and pressed and fixed by the first pressing component 2 before cutting. After cutting, the first pressing plate 27 rises first, and the moving plate 21 moves to the left, slightly carrying away the cut aluminum rods. The second pressing component 3 moves to the right, slightly moving the uncut aluminum rods to the right, allowing the blade to return to its original position. Then the moving plate 21 moves to the right, and the second pressing component 3 moves to the left to feed the material, pushing the cut aluminum rod to the left to cut it again. After the cutting is completed, the remaining waste will be clamped by the second pressing component 3. The second pressing component 3 moves to the right and pushes the waste into the collection tank 12 with the help of the material picking mechanism 4. Then the second pressing component 3 continues to clamp the new aluminum rod for the next round of work.

[0035] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. An aluminum bar cutting apparatus comprising a main body (1) having a worktable (11) formed at a front end thereof, characterized in that, The upper end of the workbench (11) is provided with a collecting groove (12), the front end of the main body (1) is provided with a withdrawable collecting frame (13), the lower end of the collecting groove (12) is communicated with the collecting frame (13), the workbench (11) is provided with a cutting groove (14) on the left side of the collecting groove (12), the lower end of the cutting groove (14) is communicated with the collecting frame (13), the main body (1) is provided with a cutting machine (16) which can move forward and backward, the blade on the cutting machine (16) moves forward and backward in the cutting groove (14), the workbench (11) is provided with a first pressing assembly (2) on the left side of the cutting groove (14), the cutting groove (14) is provided with a second pressing assembly (3), the second pressing assembly (3) moves left and right through a moving mechanism (17), the moving mechanism (17) is arranged in the main body (1), the right side of the collecting groove (12) is provided with a material taking mechanism (4), the material taking mechanism (4) can push the waste on the second pressing assembly (3) into the collecting groove (12).

2. The aluminum bar cutting apparatus according to claim 1, wherein The first pressing assembly (2) comprises a moving plate (21), a first cylinder (22), a first support frame (23), a second cylinder (24), a first sliding rod (25), a first support plate (26) and a first pressing plate (27), the moving plate (21) is slidably connected to the upper end of the workbench (11), the moving plate (21) is located on the left side of the cutting groove (14), the first cylinder (22) is arranged in the main body (1), the first cylinder (22) drives the moving plate (21) to slide left and right, the first support frame (23) is "n"-shaped and is arranged on the upper end of the workbench (11) in front and back directions, both ends of the first support frame (23) are connected to the front and back sides of the upper end of the moving plate (21), the second cylinder (24) is vertically arranged at the middle part of the upper end of the first support frame (23), the output shaft of the second cylinder (24) penetrates the first support frame (23) and is connected to the first support plate (26), the first pressing plate (27) is detachably installed on the lower end of the first support plate (26), the first sliding rod (25) is provided with two and is vertically inserted into the upper end of the first support frame (23) in front and back symmetry, and the lower end of the first sliding rod (25) is connected to the first support plate (26).

3. An apparatus for cutting an aluminum bar according to claim 2, wherein The second pressing assembly (3) comprises a support base (31), a backing plate (32), a second sliding rod (33), a third cylinder (34), a second support frame (35), a fourth cylinder (36), a third sliding rod (37), a second support plate (38) and a second pressing plate (39), the support base (31) is arranged in the collecting groove (12) in front and back directions, the support base (31) is connected to the moving mechanism (17), the third cylinder (34) is arranged in the support base (31), the backing plate (32) is arranged at the upper end of the support base (31), the output shaft of the third cylinder (34) is connected to the backing plate (32), the upper end of the second sliding rod (33) is connected to the backing plate (32), the lower end of the second sliding rod (33) is slidingly connected to the support base (31), the second support frame (35) is arranged at the upper end of the support base (31) in front and back directions and in an "n" shape, the two ends of the second support frame (35) are connected to the front and back sides of the upper end of the support base (31), the fourth cylinder (36) is vertically arranged at the middle of the upper end of the second support frame (35), the output shaft of the fourth cylinder (36) penetrates the second support frame (35) and is connected to the second support plate (38), the second pressing plate (39) is detachably arranged at the lower end of the second support plate (38), the third sliding rod (37) is arranged in two and vertically inserted into the upper end of the second support frame (35) in front and back symmetrical directions, and the lower end of the third sliding rod (37) is connected to the second support plate (38).

4. The apparatus of claim 3 wherein, The taking mechanism (4) comprises a push plate (41), the push plate (41) is arranged on the right side of the collecting groove (12), the position of the push plate (41) is lower than the upper end of the moving plate (21), and the push plate (41) can push the waste on the second pressing assembly (3) into the collecting groove (12).

5. An apparatus for cutting an aluminum bar according to claim 4, wherein A fifth cylinder (5) is arranged on the right side of the second support frame (35), the fifth cylinder (5) is arranged on the support frame in front and back directions, and the output shaft of the fifth cylinder (5) is detachably arranged with a limiting plate (51) towards the rear end.

6. An apparatus for cutting an aluminum bar according to claim 5, wherein An installation groove (15) is arranged at the upper end of the workbench (11) on the right side of the collecting groove (12), a regulating block (6) is arranged in the installation groove (15), a sixth cylinder (61) is arranged at the lower end of the regulating block (6), the output shaft of the sixth cylinder (61) is connected to the regulating block (6), and the sixth cylinder (61) drives the regulating block (6) to slide up and down.

7. An apparatus for cutting an aluminum bar according to claim 6, wherein A roller shaft (62) is arranged at the upper end of the regulating block (6) in front and back directions, and the upper end of the roller shaft (62) is level with the upper end of the moving plate (21).