Photovoltaic support round steel fixed-length cutting-off equipment

By combining laser cutting technology with clamping rotation, angle adjustment, and length setting devices, the problems of excessive debris, high noise, and low precision when cutting round steel with traditional cutting saws have been solved. This has enabled high-precision, low-noise round steel cutting, improving the quality of photovoltaic brackets and the production environment.

CN224254480UActive Publication Date: 2026-05-19江苏中宏鑫新能源科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
江苏中宏鑫新能源科技有限公司
Filing Date
2025-05-06
Publication Date
2026-05-19

AI Technical Summary

Technical Problem

Traditional cutting saws produce a lot of debris, generate a lot of noise, and have low precision when cutting round steel, which affects the quality of photovoltaic brackets and the production environment.

Method used

Using laser cutting technology, combined with a clamping and rotating device, an angle adjustment device, and a length-fixing device, high-precision cutting of round steel is achieved.

Benefits of technology

It reduces debris and noise during the cutting process, improves cutting accuracy, meets the stringent standards for photovoltaic bracket production, and ensures the consistency of round steel cut length.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses photovoltaic support round steel fixed-length cutting-off equipment which comprises a machine cabinet, and a laser cutting device, an angle adjusting device, a clamping rotating device, a supporting assembly and a fixed-length device are arranged on the machine cabinet. The clamping and rotating device achieves clamping and rotating of round steel through a gear motor, an auxiliary belt wheel, a heavy bearing and a pneumatic chuck. The angle adjusting device flexibly adjusts the angle of the laser cutting device through a driving air cylinder, a lever arm and other components. The supporting assembly adapts to the diameter of round steel and reduces rotating friction through a spring and a bull eye wheel. The length control device accurately controls the cut-off length through a small motor, a linear guide rail and a baffle plate. During use, round steel is placed on the supporting assembly, one end of the round steel is inserted into the clamping rotating device to be clamped, after the cutting angle and length are set, the laser cutting device is matched with the clamping rotating device to cut the round steel, and a finished product is taken down after cutting is completed. The equipment can effectively reduce the generation of chippings, reduce the noise and greatly improve the cutting precision.
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Description

Technical Field

[0001] This utility model relates to the field of photovoltaic bracket manufacturing technology, specifically a photovoltaic bracket round steel fixed-length cutting device. Background Technology

[0002] In traditional photovoltaic (PV) bracket manufacturing, round steel is typically cut using a cutting saw. However, this method has several drawbacks. Firstly, the intense friction between the saw blade and the steel generates a large amount of metal shavings. These shavings not only litter the floor, making them difficult to clean and increasing subsequent cleaning costs, but also pose a potential threat to product quality if they get mixed with other equipment or materials in the production environment. For example, they can cause fine scratches on the surface of the PV bracket, affecting its aesthetics and corrosion resistance. Secondly, the cutting saw produces high-decibel noise. Prolonged exposure to this noise can cause irreversible hearing damage to operators and does not meet the requirements of modern industrial production for environmentally friendly and human-centered working environments. Furthermore, the cutting precision of the cutting saw is relatively limited, making it difficult to meet increasingly stringent PV bracket manufacturing standards. This can easily result in inconsistent cut lengths of the round steel, affecting the subsequent assembly accuracy and overall performance of the PV bracket. Summary of the Invention

[0003] (a) Technical problems to be solved

[0004] The technical problem this invention aims to solve is the problem of excessive debris, high noise, and low precision when traditional cutting saws cut round steel.

[0005] (II) Technical Solution

[0006] To solve the above problems, this utility model provides the following technical solution:

[0007] A photovoltaic bracket round steel fixed-length cutting device includes a cabinet, on which a laser cutting device, an angle adjustment device, a clamping and rotating device, a support component and a fixed-length device are provided;

[0008] Furthermore, the clamping and rotating device is mounted on the cabinet for clamping the round steel and driving it to rotate. The support assembly has three parts, one of which is located on one side of the clamping and rotating device and the other two are located on the other side of the clamping and rotating device. The length-fixing device is mounted on the cabinet for cutting the end face of the round steel. The angle adjustment device is mounted on the cabinet and is positioned opposite to the length-fixing device. The laser cutting device is mounted on the angle adjustment device.

[0009] Furthermore, the clamping and rotating device includes a geared motor, an auxiliary pulley, a set of bases fixedly mounted on the cabinet, a heavy-duty bearing, and a pneumatic chuck. The outer wall of the heavy-duty bearing is connected to the base, and the inner ring of the heavy-duty bearing is connected to the pneumatic chuck and the auxiliary pulley. The auxiliary pulley is fixedly mounted on the inner ring of the heavy-duty bearing and is connected to the geared motor via a synchronous belt and a synchronous pulley. The geared motor drives the auxiliary pulley to rotate, which in turn drives the pneumatic chuck on the inner ring of the heavy-duty bearing to rotate, achieving stable clamping and rotation of the round steel and ensuring the uniformity of the cutting process.

[0010] Furthermore, the angle adjustment device includes a drive cylinder, a lever arm, a support base, and a rotating shaft. Both ends of the rotating shaft are connected to the support base via bearing seats. The lower end face of the lever arm is fixedly connected to the rotating shaft. The telescopic rod of the drive cylinder is connected to one end of the lever arm via a fisheye connector. The cylinder body of the drive cylinder is connected to the interior of the cabinet via a single-ear and double-ear connection. The laser cutting device is located at the end of the lever arm furthest from the drive cylinder. By extending and retracting the drive cylinder, the lever arm rotates around the rotating shaft, thereby flexibly adjusting the angle of the laser cutting device to adapt to different cutting needs.

[0011] Furthermore, the laser cutting device includes a semi-enclosed belt module and a laser cutting head fixedly mounted on the lever arm. The laser cutting head is fixedly mounted on the slide plate of the semi-enclosed belt module. The semi-enclosed belt module can drive the laser cutting head to move precisely, and in conjunction with the angle adjustment device, achieves omnidirectional, high-precision cutting of round steel.

[0012] Furthermore, the support assembly includes a lower base plate and an upper base plate, which are connected by screws. A spring is fitted onto the screws connecting the upper and lower base plates. A support block is provided on the upper surface of the upper base plate, and the support block has two symmetrically arranged inclined surfaces, each with a bullseye wheel. The springs allow the support assembly to adapt to changes in the diameter of the round steel, while the bullseye wheels reduce friction during rotation, ensuring stable support for the round steel during cutting.

[0013] Furthermore, the length-fixing device includes a linear guide rail, a locking guide rail slider, a connecting plate, a small motor, and a baffle plate. The linear guide rail is fixedly mounted on the upper surface of the cabinet. The connecting plate is connected to the linear guide rail via the locking guide rail slider. The small motor is fixedly mounted on the upper surface of the connecting plate. The baffle plate is connected to the rotating shaft of the small motor. By driving the baffle plate to rotate through the small motor, combined with the precise guidance of the linear guide rail and the locking guide rail slider, the cutting length of the round steel is precisely controlled.

[0014] (III) Beneficial Effects

[0015] The beneficial effects of this utility model are:

[0016] Compared to traditional cutting saws, this utility model's photovoltaic bracket round steel length-cutting device has significant advantages. Utilizing laser cutting technology, it avoids the generation of large amounts of debris during the cutting process, reducing cleaning costs. The relatively quiet laser cutting process greatly improves the working environment, protects the hearing health of operators, and meets the requirements of environmental protection and humanized production. Through the coordinated operation of the clamping and rotating device, angle adjustment device, and length-cutting device, the cutting precision of the round steel is significantly improved, accurately meeting the stringent standards of photovoltaic bracket production. This ensures that each section of round steel is cut to a consistent length, improving the subsequent assembly accuracy and overall stability of the photovoltaic bracket. Attached image description:

[0017] Figure 1 This is a perspective view of the present invention;

[0018] Figure 2 This is a schematic diagram of the clamping rotation device and angle adjustment device of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the laser cutting device of this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the support component of this utility model;

[0021] Figure 5 This is a schematic diagram of the fixed-length device of this utility model.

[0022] The diagram shows the following components: 1-cabinet, 2-clamping and rotating device, 201-gear motor, 202-secondary pulley, 203-base, 204-heavy-duty bearing, 205-pneumatic chuck, 3-angle adjustment device, 301-drive cylinder, 302-lever arm, 303-support seat, 304-rotating shaft, 4-laser cutting device, 401-semi-enclosed belt module, 402-laser cutting head, 5-support assembly, 501-lower base plate, 502-upper base plate, 503-spring, 504-support block, 505-sloping surface, 506-bullseye wheel, 6-length fixing device, 601-linear guide rail, 602-locking guide rail slider, 603-connecting plate, 604-small motor, 606-shielding plate. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] Please see Figures 1-5 The photovoltaic bracket round steel fixed length cutting device shown includes a cabinet 1, on which a laser cutting device 4, an angle adjustment device 3, a clamping and rotating device 2, a support component 5 and a fixed length device 6 are provided.

[0026] The clamping and rotating device 2 is mounted on the cabinet 1 to clamp the round steel and drive it to rotate. The support assembly 5 has three parts, one of which is located on one side of the clamping and rotating device 2 and the other two are located on the other side of the clamping and rotating device 2. The length-fixing device 6 is mounted on the cabinet 1 to cut the end face of the round steel being cut. The angle adjustment device 3 is mounted on the cabinet 1 and is positioned opposite to the length-fixing device 6. The laser cutting device 4 is mounted on the angle adjustment device 3.

[0027] The clamping and rotating device 2 includes a geared motor 201, an auxiliary pulley 202, a set of bases 203 fixedly mounted on the cabinet 1, a heavy-duty bearing 204, and a pneumatic chuck 205. The outer wall of the heavy-duty bearing 204 is connected to the base 203, and the inner ring of the heavy-duty bearing 204 is connected to the pneumatic chuck 205 and the auxiliary pulley 202. The auxiliary pulley 202 is fixedly mounted on the outer wall of the heavy-duty bearing 204 and is connected to the geared motor 201 via a synchronous belt and synchronous pulley. The geared motor 201 drives the auxiliary pulley 202 to rotate, which in turn drives the pneumatic chuck 205 on the inner ring of the heavy-duty bearing 204 to rotate, achieving stable clamping and rotation of the round steel and ensuring the uniformity of the cutting process. When the geared motor 201 is powered on and started, its output shaft drives the synchronous pulley to rotate. The synchronous pulley transmits power to the auxiliary pulley 202 through the synchronous belt. Since the auxiliary pulley 202 is fixedly connected to the inner ring of the heavy-duty bearing 204, and the inner ring of the heavy-duty bearing 204 is connected to the pneumatic chuck 205, the rotation of the auxiliary pulley 202 can drive the pneumatic chuck 205 to rotate synchronously with the inner ring of the heavy-duty bearing 204. The pneumatic chuck 205 adopts the pneumatic clamping principle. When compressed air is introduced, the internal mechanical structure of the chuck moves, causing the jaws to move towards the center, thereby tightly clamping the round steel. During rotation, it can stably maintain the position of the round steel without loosening or displacement, providing a stable foundation for subsequent cutting operations.

[0028] The angle adjustment device 3 includes a drive cylinder 301, a lever arm 302, a support base 303, and a rotating shaft 304. Both ends of the rotating shaft 304 are connected to the support base 303 via bearing seats. The lower end face of the middle section of the lever arm 302 is fixedly connected to the rotating shaft 304. The telescopic rod of the drive cylinder 301 is connected to one end of the lever arm 302 via a fisheye connector. The cylinder body of the drive cylinder 301 is connected to the interior of the cabinet 1 via a single-ear and double-ear connection. The laser cutting device 4 is located at the end of the lever arm 302 furthest from the drive cylinder 301. The extension and retraction of the drive cylinder 301 pushes the lever arm 302 to rotate around the rotating shaft 304, thereby flexibly adjusting the angle of the laser cutting device 4 to adapt to different cutting requirements. When the drive cylinder 301 receives an extension / retraction command from the control system, the telescopic rod extends or retracts according to the command. Since the telescopic rod is connected to one end of the lever arm 302 via a fisheye connector, the telescopic movement of the telescopic rod can be converted into the rotation of the lever arm 302 around the pivot 304. The laser cutting device 4 is installed at the other end of the lever arm 302. As the lever arm 302 rotates, the angle of the laser cutting device 4 will also change, thereby enabling the cutting of round steel at different angles. Similarly, the distance between the laser cutting device and the round steel can be adjusted according to different round steel diameters to ensure a sufficient safe working distance.

[0029] The laser cutting device 4 includes a semi-enclosed belt module 401 and a laser cutting head 402 fixedly mounted on the lever arm 302. The laser cutting head 402 is fixedly mounted on the slide plate of the semi-enclosed belt module 401. The semi-enclosed belt module 401 can drive the laser cutting head 402 to move precisely, and in conjunction with the angle adjustment device 3, it can achieve omnidirectional and high-precision cutting of round steel. The semi-enclosed belt module 401 is driven by a motor to rotate the belt, and the belt drives the slide plate to move along a predetermined track. Since the laser cutting head 402 is fixed on the slide plate, it can achieve precise positioning and movement of the laser cutting head 402.

[0030] The support assembly 5 includes a lower base plate 501 and an upper base plate 502, which are connected by screws. A spring 503 is fitted onto the screws connecting the upper and lower base plates 501. A support block 504 is provided on the upper surface of the upper base plate 502, and the support block 504 has two symmetrically arranged inclined surfaces 505, each with a bullseye wheel 506. The springs 503 allow the support assembly 5 to adapt to changes in the diameter of the round steel, while the bullseye wheels 506 reduce friction during rotation, ensuring stable support of the round steel during cutting. When the round steel is placed on the support assembly 5, the upper base plate 502 automatically adjusts its height according to the diameter of the round steel due to the elasticity of the springs 503. Specifically, if the diameter of the round steel is large, the pressure of the round steel on the support block 504 will cause the upper base plate 502 to compress the spring 503 downwards, thereby allowing the support block 504 to better fit with the round steel. If the diameter of the round steel is small, the spring 503 will push the upper base plate 502 upwards, ensuring that the support block 504 can always provide effective support for the round steel. At the same time, the design of the inclined surface 505 and the bullseye wheel 506 on the support block 504 allows the round steel to contact the bullseye wheel 506 when rotating. The bullseye wheel 506 can roll flexibly on the inclined surface 505, greatly reducing the friction of the round steel rotation. This not only helps the round steel to rotate smoothly but also reduces energy loss caused by friction, improving the overall operating efficiency of the equipment.

[0031] The length-fixing device 6 includes a linear guide rail 601, a locking guide rail slider 602, a connecting plate 603, a small motor 604, and a baffle plate 606. The linear guide rail 601 is fixedly mounted on the upper surface of the cabinet 1. The connecting plate 603 is connected to the linear guide rail 601 via the locking guide rail slider 602. The small motor 604 is fixedly mounted on the upper surface of the connecting plate 603. The baffle plate 606 is connected to the rotating shaft of the small motor 604. By driving the baffle plate 606 to rotate through the small motor 604, combined with the precise guidance of the linear guide rail 601 and the locking guide rail slider 602, the cutting length of the round steel is precisely controlled. Before the equipment starts operating, the control system sends a command to the small motor 604 according to the required cutting length of the round steel. The small motor 604 drives the baffle plate 606 to rotate to the corresponding angle position, and the locking guide rail slider 602 can slide precisely on the linear guide rail 601, accurately moving to the designated cutting position as the cutting end face of the round steel. When the round steel rotates under the drive of the clamping and rotating device 2, and the laser cutting device 4 performs cutting, once the end of the round steel contacts the baffle plate 606, it indicates that the round steel has reached the predetermined cutting length, and at this time the laser cutting device 4 starts working.

[0032] Working principle:

[0033] First, the round steel bar to be cut is moved to the side of the equipment and carefully placed on the support assembly 5 using a crane or other handling equipment. The support assembly 5 consists of a lower base plate 501, an upper base plate 502, a spring 503, a support block 504, an inclined plane 505, and a bullseye wheel 506. When the round steel bar contacts the support assembly 5, the upper base plate 502 automatically adjusts its height according to the diameter of the round steel bar due to the elasticity of the spring 503. Specifically, if the diameter of the round steel bar is large, the pressure of the round steel bar on the support block 504 causes the upper base plate 502 to compress the spring 503 downward, making the support block 504 fit tightly against the round steel bar; if the diameter of the round steel bar is small, the spring 503 pushes the upper base plate 502 upward, ensuring that the support block 504 always provides effective support for the round steel bar. Meanwhile, the inclined surface 505 on the support block 504 cooperates with the bullseye wheel 506. When the round steel is placed on it, the bullseye wheel 506 contacts the round steel. During the rotation of the round steel, the bullseye wheel 506 can roll flexibly along the inclined surface 505, which greatly reduces the friction of the round steel rotation. This not only ensures the smooth rotation of the round steel, but also reduces the energy loss caused by friction, keeping the round steel in a horizontal and stable state for processing.

[0034] The operator then slowly pushes one end of the round steel bar towards the clamping and rotating device 2 until it is precisely inserted into the center of the pneumatic chuck 205. The clamping and rotating device 2 includes a geared motor 201, a secondary pulley 202, a base 203, a heavy-duty bearing 204, and a pneumatic chuck 205. The pneumatic chuck 205 operates based on the pneumatic clamping principle. When compressed air is introduced, its internal mechanical structure drives the jaws to move towards the center, tightly clamping the round steel bar. At this point, the round steel bar is stably fixed, laying a solid foundation for subsequent cutting operations.

[0035] The operator inputs the required cutting angle parameters on the equipment's control panel. The control panel transmits the command to the angle adjustment device 3, which consists of a drive cylinder 301, a lever arm 302, a support base 303, and a rotating shaft 304. Upon receiving the command, the drive cylinder 301 extends or retracts its telescopic rod. Since the telescopic rod is connected to one end of the lever arm 302 via a fisheye joint, the extension and retraction of the telescopic rod is converted into the rotation of the lever arm 302 around the rotating shaft 304. The laser cutting device 4 is installed at the other end of the lever arm 302; as the lever arm 302 rotates, the angle of the laser cutting device 4 also changes. Through this process, the angle of the laser cutting head 402 relative to the round steel can be precisely adjusted to meet diverse processing requirements.

[0036] Meanwhile, the cutting length of the round steel is set on the control panel. The length-fixing device 6 includes a linear guide rail 601, a locking guide rail slider 602, a connecting plate 603, a small motor 604, and a blocking plate 606. The control system sends a command to the small motor 604 according to the set cutting length, and the small motor 604 drives the blocking plate 606 to rotate to the corresponding angle position. The locking guide rail slider 602 can also slide precisely on the linear guide rail 601 to the corresponding position and then lock. Therefore, after the blocking plate 606 rotates to the correct position, it moves accurately to the designated cutting position under the guidance of the linear guide rail 601, serving as the cutting end face for the round steel.

[0037] Once the above preparations are complete—namely, the round steel is fixed, the cutting angle is adjusted, and the cutting length is set—the laser cutting device 4 is started. The laser cutting device 4 consists of a semi-enclosed belt module 401 fixed to the lever arm 302 and a laser cutting head 402. The semi-enclosed belt module 401 is driven by a motor to rotate the belt, which in turn moves the slide plate along a predetermined track. The laser cutting head 402 is fixed to the slide plate. The laser cutting head 402 is adjusted to a suitable position with the round steel, and the laser generator produces a high-energy-density laser beam, which is transmitted to the laser cutting head 402 through the optical path. During the cutting process…

[0038] Simultaneously, the geared motor 201 of the clamping and rotating device 2 starts, driving the auxiliary pulley 202 to rotate, which in turn drives the pneumatic chuck 205 of the inner ring of the heavy-duty bearing 204 to rotate, causing the clamped round steel to rotate at a uniform speed. The laser cutting head 402 works in conjunction with the rotating round steel, and the laser beam continuously cuts the surface of the round steel, gradually severing it. During the cutting process, the operator can observe the cutting progress and quality in real time through the monitoring camera equipped with the equipment to ensure the smooth progress of the cutting process.

[0039] The embodiments are detailed, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A photovoltaic bracket round steel fixed-length cutting device, comprising a cabinet (1), characterized in that: The cabinet (1) is equipped with a laser cutting device (4), an angle adjustment device (3), a clamping and rotating device (2), a support assembly (5), and a length fixing device (6). The clamping and rotating device (2) is installed on the cabinet (1) to clamp the round steel and drive the round steel to rotate. The support assembly (5) has three parts, one of which is installed on one side of the clamping and rotating device (2) and the other two are installed on the other side of the clamping and rotating device (2). The length fixing device (6) is installed on the cabinet (1) to cut the end face of the round steel to be cut. The angle adjustment device (3) is installed on the cabinet (1) and the length fixing device (6) is installed opposite to each other. The laser cutting device (4) is installed on the angle adjustment device (3).

2. The photovoltaic support round steel fixed-length cutting device according to claim 1, characterized in that: The clamping and rotating device (2) includes a geared motor (201), a secondary pulley (202), a set of bases (203) fixedly mounted on the cabinet (1), a heavy bearing (204), and a pneumatic chuck (205). The outer wall of the heavy bearing (204) is connected to the base (203), and the inner ring of the heavy bearing (204) is connected to the pneumatic chuck (205) and the secondary pulley (202). The secondary pulley (202) is fixedly mounted on the inner ring of the heavy bearing (204), and the secondary pulley (202) is connected to the geared motor (201) through a synchronous belt and synchronous pulley connection.

3. The photovoltaic support round steel fixed-length cutting device according to claim 2, characterized in that: The angle adjustment device (3) includes a drive cylinder (301), a lever arm (302), a support seat (303), and a rotating shaft (304). The two ends of the rotating shaft (304) are connected to the support seat (303) through a bearing seat with a shaft. The lower end face of the middle part of the lever arm (302) is fixedly connected to the rotating shaft (304). The telescopic rod of the drive cylinder (301) is connected to one end of the lever arm (302) through a fisheye connector. The cylinder body of the drive cylinder (301) is connected to the inside of the cabinet (1) through a single-ear seat and a double-ear seat connection. The laser cutting device (4) is located at the end of the lever arm (302) away from the drive cylinder (301).

4. The photovoltaic support round steel fixed-length cutting device according to claim 3, characterized in that: The laser cutting device (4) includes a semi-enclosed belt module (401) and a laser cutting head (402) fixedly mounted on the lever arm (302). The laser cutting head (402) is fixedly mounted on the slide plate of the semi-enclosed belt module (401).

5. The photovoltaic support round steel fixed-length cutting device according to claim 1, characterized in that: The support assembly (5) includes a lower base plate (501) and an upper base plate (502). The upper base plate (502) and the lower base plate (501) are connected by screws. A spring (503) is also fitted on the screws used to connect the upper base plate (502) and the lower base plate (501). A support block (504) is provided on the upper surface of the upper base plate (502). The support block (504) has two symmetrically arranged inclined surfaces (505), and each inclined surface (505) is provided with a bullseye wheel (506).

6. The photovoltaic support round steel fixed-length cutting device according to claim 1, characterized in that: The length-fixing device (6) includes a linear guide rail (601), a locking guide rail slider (602), a connecting plate (603), a small motor (604), and a shielding plate (606). The linear guide rail (601) is fixedly installed on the upper surface of the cabinet (1). The connecting plate (603) is connected to the linear guide rail (601) through the locking guide rail slider (602). The small motor (604) is fixedly installed on the upper surface of the connecting plate (603). The shielding plate (606) is connected to the rotating shaft of the small motor (604).