An inside spreader hanger for use in automated spray line columns and method of use

Abstract

The application discloses an inner supporting type lifting appliance for automatically spraying column workpieces of a spraying line and a use method, belongs to the field of industrial automatic spraying lines, and comprises a main cylinder, an auxiliary cylinder and an inner supporting claw, the main shaft of the main cylinder is connected with the auxiliary cylinder, the bottom of the cylinder body of the auxiliary cylinder is connected with a protective cover, the lower surface of the protective cover is connected with an upper three-tooth connecting piece and a laser range finder, the laser range finder is located on one side of the upper three-tooth connecting piece, the main shaft of the main cylinder penetrates through the auxiliary cylinder, the protective cover and the upper three-tooth connecting piece, and the tail end of the main shaft of the main cylinder is connected to a lower three-tooth connecting piece. The inner supporting claw is made to enter the inside of the column workpiece through the main cylinder, the inner supporting claw is expanded and clamped to the column workpiece through the auxiliary cylinder, the inner supporting claw is opened or contracted, the inner supporting claw can realize automatic opening and closing movement according to the action of the cylinder, and different sizes of column workpieces can be adapted.

Description

Technical Field

[0001] This invention belongs to the field of industrial automated spraying lines, and relates to a spraying fixture for the outer wall of a column, and more particularly to an internal support type lifting device for column workpieces in automated spraying lines and its usage method. Background Technology

[0002] In modern industrial production, automated spraying lines play a crucial role in the surface treatment of various products. This is especially true for spraying the outer surfaces of columns, where traditional methods have many limitations and shortcomings.

[0003] Traditional processes rely heavily on manual operation. A typical procedure involves first attaching waterproof paper to the end face of the column as a simple shielding measure to prevent paint from contaminating areas that don't need painting during the spraying process. The column with the waterproof paper attached is then placed on a turntable, which is manually rotated by the worker to complete the spraying. This method has revealed numerous problems in practical application. The quality of the column's paint application largely depends on the worker's skill level. Differences in worker proficiency, technique consistency, and understanding of spraying parameters lead to inconsistent column quality even under the same process conditions. Furthermore, because a completely seamless fit between the waterproof paper and the column's end face is impossible after spraying, paint often seeps into the edges of the waterproof paper where it meets the column, necessitating repainting at the waterproof paper's attachment point. The initial waterproofing paper application is time-consuming and labor-intensive, significantly reducing production efficiency. When encountering substandard products, rework is an extremely tedious process. Due to the instability of traditional processes, the product defect rate is relatively high. Rework often requires removing the already applied paint and reapplying the waterproofing paper, spraying again, and so on. This not only wastes a significant amount of paint, manpower, and time, but may also damage the column surface due to repeated processing. For columns of different specifications, traditional processes require different platforms. Because columns of different specifications differ in size, shape, and weight, the original platforms and fixing devices may not be compatible.

[0004] Therefore, there is an urgent need for an internal support type lifting device and its usage method for cylindrical workpieces in automated spraying lines to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide an internal support type hanger for cylindrical workpieces in an automated spraying line and a method of using it, so as to overcome the shortcomings of the prior art, which requires manual handling during spraying, and requires changing different platforms for different specifications of cylindrical workpieces, resulting in low efficiency and the inability to achieve automated spraying.

[0006] To achieve the above objectives, the present invention provides the following technical solution: On one hand, the present invention provides an internal support type lifting device for cylindrical workpieces in an automated spraying line, comprising a main cylinder, an auxiliary cylinder, and an internal support claw. The main cylinder's spindle is connected to the auxiliary cylinder, and a protective cover is connected to the bottom of the auxiliary cylinder body. An upper three-tooth connector and a laser rangefinder are connected to the lower surface of the protective cover, and the laser rangefinder is located on one side of the upper three-tooth connector. The main cylinder's spindle passes through the auxiliary cylinder, the protective cover, and the upper three-tooth connector, and the end of the main cylinder's spindle is connected to a lower three-tooth connector. The main cylinder is used to extend and retract to push the internal support claw into the interior of the cylindrical workpiece. The auxiliary cylinder is used to control the retraction of the internal support claw. The internal support claw is used to apply force to the inner wall of the cylindrical workpiece and clamp it to the inner wall of the cylindrical workpiece. The laser rangefinder is used to automatically determine whether the protective cover is in close contact with the end face of the cylindrical workpiece. The protective cover is used to prevent paint from being sprayed into the interior of the cylindrical workpiece during spraying.

[0007] The upper three-tooth connector connects to the upper end of the inner support claw, and the lower three-tooth connector rotatably connects to the middle section of the inner support claw. The auxiliary cylinder controls the retraction of the inner support claw, and the protective cover seals the upper end face and inner surface of the column to prevent paint from spraying into the column during painting. The laser rangefinder automatically determines whether the protective cover is in close contact with the end face of the column. The inner support claw applies force to the inner wall of the column through the auxiliary cylinder, and the upper three-tooth connector restricts the movement trajectory of the upper end of the inner support claw, ensuring that the inner support claw opens or retracts in a predetermined manner, thereby achieving effective support or release for the column workpiece.

[0008] Furthermore, the upper three-tooth connector has multiple toothed plates evenly distributed around its perimeter, with each pair of toothed plates forming a toothed plate group. The upper three-tooth connector connects to the upper end of the inner support claw through these toothed plate groups. This connection method increases the number of connection points, making the connection between the inner support claw and the upper three-tooth connector more stable.

[0009] Furthermore, the lower three-tooth connector is connected to the middle section of the inner support claw via a connecting arm. The lower three-tooth connector is rotatably connected to one end of the connecting arm, and the middle section of the inner support claw is rotatably connected to the other end of the connecting arm. Its rotatable connection with the connecting arm and its connection structure with the main cylinder ensure that, when bearing the weight of the cylindrical workpiece and external interference forces, the inner support claw can always stably support the cylindrical workpiece through its own movement adjustment and force transmission.

[0010] Furthermore, the end of the inner support claw is equipped with an anti-wear pad. When the anti-wear pad contacts the inner wall of the cylindrical workpiece, it can effectively prevent scratching the surface of the cylindrical workpiece. The anti-wear pad also reduces friction and wear between the inner support claw and the cylindrical workpiece, thus extending the service life of the inner support claw.

[0011] Furthermore, a bellows cover is provided at the connection between the main shaft of the main cylinder and the auxiliary cylinder. The bellows cover is used to protect the main shaft of the main cylinder and prevent contamination of the main shaft during spraying.

[0012] Furthermore, the main shaft of the main cylinder and the auxiliary cylinder are connected by a pin, and the end of the main shaft of the main cylinder and the lower three-tooth connecting piece are connected by a pin.

[0013] Furthermore, the anti-wear pad is a high-temperature resistant and wear-resistant rubber pad, and the surface of the anti-wear pad is drilled with countersunk holes and fixed to the upper surface of the end of the inner support claw by bolts.

[0014] Furthermore, the top of the bolt is 2mm below the surface of the anti-wear pad.

[0015] Furthermore, this invention provides a method for using an internal support type lifting device for cylindrical workpieces in an automated spraying line, mainly including the following steps: The laser positioning on the conveyor line generates an alignment signal and sends it to the main cylinder. After receiving the alignment signal, the main cylinder extends along the central axis of the cylindrical workpiece, causing the inner support claw to extend into the cylindrical workpiece. When the laser rangefinder detects that the distance between the protective cover and the end face of the cylindrical workpiece is gradually decreasing and finally makes contact, the laser rangefinder immediately sends a stop extension signal to the main cylinder. At this time, the inner support claw has partially extended into the cylindrical workpiece, but has not yet fully clamped the workpiece. The laser rangefinder sends a start signal to the auxiliary cylinder. After receiving the start signal, the auxiliary cylinder's movement will cause the main cylinder's spindle to generate a relative displacement. Then, through the linkage between the upper three-tooth connector, the lower three-tooth connector, and the connecting arm, the inner support claw begins to expand outward, so that the inner support claw fits tightly against the inner wall of the column workpiece. The inner support claw completes the clamping action on the column workpiece, and the column workpiece is stably hung on the lifting device.

[0016] Furthermore, after the cylindrical workpiece is coated, the auxiliary cylinder causes the inner support claw to retract. The main cylinder retracts, causing the inner support claw to retract outside the cylindrical workpiece.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides an internal support type lifting device for cylindrical workpieces in an automated spraying line. It is used in conjunction with a main cylinder, a secondary cylinder, an internal support claw, a protective cover, a laser rangefinder, an upper three-tooth connector, and a lower three-tooth connector. The main cylinder causes the internal support claw to enter the cylindrical workpiece, while the secondary cylinder pushes the internal support claw to expand and clamp it onto the workpiece. The internal support claw can open or retract automatically according to the cylinder's movement, adapting to cylindrical workpieces of different sizes.

[0018] Specifically, the laser rangefinder measures the internal dimensions of the cylindrical workpiece when the lifting device approaches it, and transmits the measurement data to the main and auxiliary cylinders in real time. This allows the lifting device to automatically adapt to cylindrical workpieces with different inner diameters without manual adjustment, improving the intelligence and production efficiency of the automated painting line. Furthermore, it ensures that the inner support claws provide appropriate support force when loading different workpieces, preventing damage to the workpiece or affecting the painting quality due to improper support. Specifically, after the cylindrical workpiece is mounted, the anti-wear pad at the end of the inner support claw makes close contact with the inner wall of the workpiece. The anti-wear pad is made of high-temperature resistant and wear-resistant rubber, which effectively prevents scratching of the workpiece's inner wall during mounting and spraying, while also providing sufficient friction and cushioning to ensure stable suspension of the cylindrical workpiece on the hanger. The bellows cover and pin connections between the main cylinder's spindle and the auxiliary cylinder ensure smooth cylinder movement and mechanical stability, enabling the hanger to operate stably throughout the automated spraying process.

[0019] This invention provides a method for using an internally supported hanger for cylindrical workpieces in an automated spraying line. The hanger ensures tight and stable contact with the inner wall of the workpiece through the opening and closing control of the internal support claws, providing reliable support. During automated spraying, regardless of changes in the shape and size of the cylindrical workpiece, the hanger maintains a stable suspension state, effectively preventing problems such as workpiece swaying, shifting, or falling off due to unstable support. This ensures consistent and uniform spraying quality, reduces scrap rates, and improves overall product quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the internal support type lifting device for cylindrical workpieces in an automated spraying line according to an embodiment of the present invention.

[0021] In the diagram, 1. Main cylinder, 2. Auxiliary cylinder, 3. Protective cover, 4. Laser rangefinder, 5. Upper three-tooth connector, 6. Lower three-tooth connector, 7. Connecting arm, 8. Inner support claw, 9. Anti-wear pad, 10. Toothed plate. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0024] Example 1 See Figure 1 This invention provides an internal support type lifting device for cylindrical workpieces in an automated spraying line, including a main cylinder 1, an auxiliary cylinder 2, a protective cover 3, a laser rangefinder 4, an upper three-tooth connector 5, a lower three-tooth connector 6, a connecting arm 7, an internal support claw 8, and an anti-wear pad 9; the lifting device can meet the spraying needs of cylindrical workpieces of various specifications.

[0025] The main shaft of the main cylinder 1 is connected to the auxiliary cylinder 2 by a pin, and the bottom of the auxiliary cylinder 2 is connected to a protective cover 3. Both the main cylinder 1 and the auxiliary cylinder 2 are sealed with bellows covers to protect the main shaft of the main cylinder 1 and prevent contamination of the main shaft during spraying. The protective cover 3 can prevent paint from being sprayed into the interior of the column during spraying. The lower surface of the protective cover 3 is connected to an upper three-tooth connector 5 and a laser rangefinder 4. The laser rangefinder 4 is located on one side of the upper three-tooth connector 5. The laser rangefinder 4 is used to automatically determine whether the protective cover 3 is in close contact with the end face of the column workpiece. The main shaft of the main cylinder 1 passes through the auxiliary cylinder 2, the protective cover 3 and the upper three-tooth connector 5, and the end of the main shaft of the main cylinder 1 is connected to the lower three-tooth connector 6 by a pin. The upper three-tooth connector 5 is connected to the upper end of the inner support claw 8, and the lower three-tooth connector 6 is rotatably connected to the middle section of the inner support claw 8.

[0026] The main cylinder 1 is fixed to the production line suspension device by screws. The production line suspension device transports the lifting device to the top of the cylindrical workpiece in the loading area. The main cylinder 1 is used to send the inner support claw 8 into the interior of the cylindrical workpiece. The auxiliary cylinder 2, through its connection with the main shaft of the main cylinder 1, drives the main shaft of the main cylinder 1 to move up and down within a certain range. Since the main shaft of the main cylinder 1 is connected to the lower three-tooth connector 6, and the upper three-tooth connector 5 is connected to the upper end of the inner support claw 8, and the lower three-tooth connector 6 is rotatably connected to the middle section of the inner support claw 8 and connected to the middle section of the inner support claw 8 through the connecting arm 7, the action of the auxiliary cylinder 2 will cause the inner support claw 8 to open at a certain angle. When the laser rangefinder 4 senses that the protective cover 3 is in close contact with the end face of the cylindrical workpiece, the auxiliary cylinder 2 pushes the inner support claw 8, causing the inner support claw 8 to expand and clamp onto the cylindrical workpiece.

[0027] It should be noted that after the main cylinder 1 and the auxiliary cylinder 2 are connected, sliding rods are arranged around both of them.

[0028] It should be noted that the laser rangefinder 4 is installed on the lower part of the protective cover 3, and the ranging value is set in advance according to the diameter of various types of cylindrical workpieces.

[0029] In some preferred embodiments of the present invention, the upper three-tooth connector 5 has a plurality of toothed plates 10 evenly distributed around its perimeter, with each pair of toothed plates 10 forming a toothed plate group. The upper three-tooth connector 5 is connected to the upper end of the inner support claw 8 through the toothed plate group. When the auxiliary cylinder 2 is activated, the power is transmitted to the lower three-tooth connector 6 through the main shaft of the main cylinder 1. The movement of the lower three-tooth connector 6, combined with the linkage of the connecting arm 7, causes the inner support claw 8 to move relative to each other. In this process, the upper three-tooth connector 5 plays a role in restricting the movement trajectory of the upper end of the inner support claw 8, ensuring that the inner support claw 8 opens or retracts in a predetermined manner, thereby achieving effective support or release for the cylindrical workpiece.

[0030] In some preferred embodiments of the present invention, the lower three-tooth connector 6 is connected to the middle section of the inner support claw 8 via a connecting arm 7. The lower three-tooth connector 6 is rotatably connected to one end of the connecting arm 7, and the middle section of the inner support claw 8 is rotatably connected to the other end of the connecting arm 7 and connected to the end of the main shaft of the main cylinder 1. When the main cylinder 1 extends or retracts, it directly drives the lower three-tooth connector 6 to move up and down. This movement is transmitted to the middle section of the inner support claw 8 through the connecting arm 7, enabling the inner support claw 8 to rotate around its connection point with the upper three-tooth connector 5, thereby realizing the opening and closing action of the inner support claw 8. The connecting arm 7 can convert the vertical linear motion of the lower three-tooth connector 6 into the rotational motion of the middle section of the inner support claw 8. When the main cylinder 1 drives the lower three-tooth connector 6 to move up and down, the two ends of the connecting arm 7 rotate around the connection point with the lower three-tooth connector 6 and the inner support claw 8, respectively, causing the middle section of the inner support claw 8 to change angle accordingly, thereby driving the opening and closing of the inner support claw 8 as a whole. During the spraying process, when the cylindrical workpiece is disturbed by external forces, the connecting arm 7 can automatically adjust the support angle and force of the inner support claw 8 according to the direction and magnitude of the force, so as to maintain the balance and stability of the cylindrical workpiece.

[0031] In some preferred embodiments of the present invention, the three sets of toothed plates evenly distributed around the lower three-toothed connector 6 are connected to the middle section of the inner support claw 8 through the connecting arm 7, and the connection is made by a pin.

[0032] In some preferred embodiments of the present invention, an anti-wear pad 9 is installed at the end of the inner support claw 8. The anti-wear pad 9 is a high-temperature resistant and wear-resistant rubber pad, and the surface of the anti-wear pad 9 is drilled with countersunk holes and fixed to the upper surface of the end of the inner support claw 8 by bolts. The top of the bolts is 2mm lower than the surface of the anti-wear pad 9. For example, the anti-wear pad 9 is fixed to the end of the inner support claw 8 by hexagonal screws. The high-temperature resistant and wear-resistant rubber anti-wear pad 9 installed at the end of the inner support claw 8 can effectively prevent scratches on the surface of the cylindrical workpiece when in contact with the inner wall of the cylindrical workpiece. In the automated spraying process, the surface quality requirements of the cylindrical workpiece are high, and any minor scratches may affect the appearance and performance of the product. The presence of the anti-wear pad 9 ensures that the cylindrical workpiece is not damaged during loading, spraying, and unloading, improving the product qualification rate and surface quality. At the same time, the anti-wear pad 9 also reduces the friction and wear between the inner support claw 8 and the cylindrical workpiece, extends the service life of the inner support claw 8, and reduces the maintenance cost and replacement frequency of the lifting device.

[0033] Example 2 This invention provides a method for using an internally supported lifting device for cylindrical workpieces in an automated painting line. A suspension mechanism on the conveyor line is rigidly connected to the main cylinder 1 of the lifting device, smoothly transporting the lifting device, initially in a retracted state, to the area near the top of the cylindrical workpiece. During transport, a laser positioning system on the conveyor line continuously scans the relative position information of the lifting device and the cylindrical workpiece.

[0034] When the lifting device approaches the cylindrical workpiece, the laser positioning generates an alignment signal and sends it to the main cylinder 1. After receiving the alignment signal, the main cylinder 1 extends along the central axis of the cylindrical workpiece, causing the inner support claw 8 to extend into the cylindrical workpiece. When the laser rangefinder 4 detects that the distance between the protective cover 3 and the end face of the cylindrical workpiece gradually decreases and finally contacts, the laser rangefinder 4 immediately sends a stop extension signal to the main cylinder 1. At this time, the inner support claw 8 has partially extended into the cylindrical workpiece, but has not yet fully clamped the workpiece. The laser rangefinder 4 sends a start signal to the auxiliary cylinder 2. After receiving the start signal, the auxiliary cylinder 2 will cause the main shaft of the main cylinder 1 to generate a relative displacement. Then, through the linkage between the upper three-tooth connector 5, the lower three-tooth connector 6 and the connecting arm 7, the inner support claw 8 begins to expand outward, so that the inner support claw 8 fits tightly against the inner wall of the column workpiece. The inner support claw 8 completes the clamping action of the column workpiece, and the column workpiece is stably hung on the lifting device.

[0035] After the column workpiece is sprayed, the auxiliary cylinder 2 drives the inner support claw 8 to slowly retract inward, and the inner support claw 8 disengages from the inner wall of the column workpiece. After the auxiliary cylinder 2 completes the retraction action of the inner support claw 8, it retracts to the outside of the column workpiece. The automated conveyor line moves the retracted lifting device to the designated unloading position, removes the painted column workpiece, and then the lifting device returns to the initial position, ready for the next column workpiece loading and painting operation.

[0036] Throughout the spraying process, the hanger firmly supports the cylindrical workpiece via the inner support claw 8, maintaining its stable posture and position. The anti-wear pad 9 of the inner support claw 8 not only effectively prevents scratches on the inner wall of the workpiece but also provides sufficient friction to prevent the cylindrical workpiece from shaking, rotating, or shifting due to the impact of paint spraying or other external forces during the spraying process.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An internal support type lifting fixture for cylindrical workpieces in an automated spraying line, characterized in that, It includes a main cylinder (1), an auxiliary cylinder (2) and an inner support claw (8). The main shaft of the main cylinder (1) is connected to the auxiliary cylinder (2), and a protective cover (3) is connected to the bottom of the auxiliary cylinder (2). An upper three-tooth connector (5) and a laser rangefinder (4) are connected to the lower surface of the protective cover (3). The laser rangefinder (4) is located on one side of the upper three-tooth connector (5). The main shaft of the main cylinder (1) passes through the auxiliary cylinder (2), the protective cover (3) and the upper three-tooth connector (5), and the end of the main shaft of the main cylinder (1) is connected to the lower three-tooth connector (6). The upper three-tooth connector (5) is connected to the upper end of the inner support claw (8), and the lower three-tooth connector (6) is rotatably connected to the middle section of the inner support claw (8).

2. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 1, characterized in that, The upper three-tooth connector (5) has multiple toothed pieces (10) evenly distributed around its perimeter. Each pair of toothed pieces (10) forms a toothed piece group. The upper three-tooth connector (5) is connected to the upper end of the inner support claw (8) through the toothed piece group.

3. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 1, characterized in that, The lower three-tooth connector (6) is connected to the middle section of the inner support claw (8) via the connecting arm (7). The lower three-tooth connector (6) is rotatably connected to one end of the connecting arm (7), and the middle section of the inner support claw (8) is rotatably connected to the other end of the connecting arm (7).

4. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 1, characterized in that, The end of the inner support claw (8) is fitted with an anti-wear pad (9).

5. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 1, characterized in that, The main shaft of the main cylinder (1) and the connecting part of the auxiliary cylinder (2) are provided with a bellows cover.

6. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 1, characterized in that, The main shaft of the main cylinder (1) and the auxiliary cylinder (2) are connected by a pin, and the end of the main shaft of the main cylinder (1) and the lower three-tooth connector (6) are connected by a pin.

7. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 4, characterized in that, The anti-wear pad (9) is a high-temperature resistant and wear-resistant rubber pad, and the surface of the anti-wear pad (9) is drilled with countersunk holes and fixed to the upper surface of the end of the inner support claw (8) by bolts.

8. The internal support type lifting fixture for cylindrical workpieces in an automated spraying line according to claim 7, characterized in that, The top of the bolt is 2mm below the surface of the anti-wear pad (9).

9. A method of using an internal support type lifting device for cylindrical workpieces in an automated spraying line as described in any one of claims 1-8, characterized in that, Includes the following steps: The laser positioning on the conveyor line sends a centering signal to the main cylinder (1), and the main cylinder (1) extends to push the inner support claw (8) into the cylindrical workpiece. When the laser rangefinder (4) detects that the protective cover (3) is in contact with the end face of the cylindrical workpiece, the laser rangefinder (4) sends a signal to the main cylinder (1), and the main cylinder (1) stops extending. At the same time, the laser rangefinder (4) sends a start signal to the auxiliary cylinder (2), and the auxiliary cylinder (2) pushes the inner support claw (8) to expand and clamp the cylindrical workpiece before spraying.

10. The method of using an internal support type lifting device for cylindrical workpieces in an automated spraying line according to claim 9, characterized in that, When the spraying is finished, the following steps are included: After the column workpiece is sprayed, the auxiliary cylinder (2) causes the inner support claw (8) to retract; The main cylinder (1) retracts, causing the inner support claw (8) to retract outside the column workpiece.

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