A main hanger in a painting production line

Abstract

This invention discloses a main hanger in a coating production line, comprising: a main hanger beam, with a hanging rack installed below the main hanger beam. Workpieces can be suspended on the hanging rack during coating. The main hanger beam is equipped with a rope structure, allowing it to be suspended below a suspended conveyor chain. The rope structure includes: two fixed pulleys and a steel wire rope. The two fixed pulleys are respectively fixed to the front and rear ends of the main hanger beam. The steel wire rope is wound around the two fixed pulleys, and both ends of the steel wire rope are connected to the suspended conveyor chain at intervals. This allows the main hanger beam to be suspended below the suspended conveyor chain via the steel wire rope and the two fixed pulleys. When the main hanger beam enters an uphill or downhill section under the conveyor chain, it tends to be horizontal under the combined action of the two fixed pulleys and the steel wire rope. The aforementioned main hanger can maintain good balance when hanging workpieces and is well restrained when conveyed to a bend in the suspended conveyor chain, preventing significant outward rotation.

Description

Technical Field

[0001] This invention relates to the field of coating equipment, and more specifically to a main hanger in a coating production line. Background Technology

[0002] Coating refers to covering the surface of a workpiece with a protective or decorative layer. In a coating production line, a suspended conveyor chain is used to transport the workpieces to be coated. Hangers are suspended on the conveyor chain, and workers hang the workpieces on these hangers using fixtures. During coating, the workpieces, transported by the conveyor chain, first undergo degreasing, grease removal, and curing processes in sequence. Then, the workpieces are sent to an oven for drying, followed by a spray booth for spraying. After spraying, the workpieces are sent to another oven for heating, allowing the coating on the workpiece surface to cure and form a coating layer. Only then is the coating process considered complete. There is a single-hook hanger, which has only one hook located at the top of the hanging rod in the middle of the hanger. The single-hook hanger is attached to the overhead conveyor chain via this hook. However, the single-hook hanger has the following disadvantages: 1. When workers load workpieces, they usually hang them on one side of the hanger first, and then on the other side. Loading workpieces on one side first causes imbalance. When loading heavy workpieces, this imbalance causes significant tilting of the hanger. Excessive tilting can cause irreversible deformation of the hanging rod, rendering the hanger unusable for painting production. 2. When the hanger is conveyed to a bend in the overhead conveyor chain, due to the... With only one attachment point between the hanging rack and the overhead conveyor chain, the hangers cannot be effectively constrained. This allows the hangers to easily rotate significantly outward at turns. After rotating significantly outward, adjacent hangers are prone to colliding, affecting coating quality. To prevent hangers from colliding, adjacent hangers on the overhead conveyor chain must be spaced far enough apart. However, this reduces the number of hangers on the overhead conveyor chain, which in turn reduces the number of workpieces on the chain, thus lowering production efficiency. In addition, the significant outward rotation of the hangers occupies more space. Sufficient space must be left at turns of the overhead conveyor chain to avoid the hangers, which greatly increases the area required for production. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a main hanger in a painting production line that is not easily damaged when hanging workpieces and can be well restrained when being transported to the turning point of the suspended conveyor chain so as not to rotate outwards significantly.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows: a main hanger in a coating production line, comprising: a main hanger beam, characterized in that: a hanging frame is installed below the main hanger beam, on which the workpiece can be suspended during coating; a pull rope structure is provided on the main hanger beam, which can be suspended below the suspended conveyor chain in the coating production line; the pull rope structure comprises: two fixed pulleys and a steel wire rope; the two fixed pulleys are respectively fixed to the front and rear ends of the main hanger beam; the steel wire rope is wound around the two fixed pulleys and the two ends of the steel wire rope can be connected to the suspended conveyor chain at intervals, so that the main hanger beam can be suspended below the suspended conveyor chain through the steel wire rope and the two fixed pulleys; when the main hanger beam enters an uphill or downhill section under the conveyor chain, the main hanger beam can slide on the steel wire rope through the two fixed pulleys, so that the main hanger beam can tend to be horizontal.

[0005] Furthermore, in the aforementioned main hanger of a coating production line, the hanger includes at least two horizontal bars arranged side by side at intervals. The horizontal bars and the main hanging beam have the same orientation. Each horizontal bar has several hanging parts along its body for suspending workpieces to be coated. Each horizontal bar is connected to the main hanging beam through a mounting frame that can extend and retract left and right, so that the left and right distance between adjacent horizontal bars can be adjusted by the extension and retraction of the mounting frame in the left and right directions.

[0006] Furthermore, in the aforementioned main frame of a coating production line, the left and right telescopic mounting frame is a scissor-type telescopic mechanism. The scissor-type telescopic mechanism is installed horizontally on the lower side of the main hanging beam, and each crossbar is connected to the lower side of the scissor-type telescopic mechanism. The spacing between adjacent crossbars can be adjusted as the scissor-type telescopic mechanism extends and retracts.

[0007] Furthermore, in the aforementioned main frame of a coating production line, the scissor-type telescopic mechanism includes two scissor-type folding frames, which are respectively installed below the front and rear ends of the main beam. Each folding frame includes two scissor rods and four short connecting rods. The two scissor rods are arranged in a crisscross pattern, and the intersection of the two scissor rods is hinged to each other by a first hinge shaft, so that the two scissor rods are hinged to form a scissor arm. The upper end of the first hinge shaft is fixed to the end of the main beam. The four short connecting rods are located on the left and right sides of the scissor arm in pairs. The two ends of the left side of the scissor arm and the two ends of the right side of the scissor arm are respectively hinged to the inner ends of the two short connecting rods on their respective sides. The outer ends of the two short connecting rods on the left side and the two short connecting rods on the right side are respectively hinged to a second hinge shaft.

[0008] Furthermore, in the aforementioned main frame of a coating production line, there are two crossbars, each connected to the lower end of a second hinge shaft on its side; the folding frame can be folded or unfolded in the left and right directions under the action of external force, so that the left and right distance between the two crossbars can be adjusted.

[0009] Furthermore, in the aforementioned main frame of a coating production line, there are three crossbars: the middle crossbar is connected to the lower end of the first hinge shaft, and the two crossbars on the left and right sides are respectively connected to the lower ends of the two second hinge shafts on their respective sides; the folding frame can be folded or unfolded in the left and right directions under the action of external force, so that the left and right distance between the three crossbars can be adjusted.

[0010] Furthermore, in the aforementioned main frame of a coating production line, a linkage mechanism is also provided that enables two folding frames to move together. The linkage mechanism is located between the two folding frames and connected to them, so that the two folding frames can be folded or unfolded synchronously.

[0011] Furthermore, in the aforementioned main hanger of a coating production line, the linkage mechanism includes: a swing arm, two transmission rods, and four push-pull rods. The swing arm is located below the main hanger beam and its middle part is hinged to the main hanger beam. The four push-pull rods are located in pairs on the front and rear sides of the swing arm. The two ends of the swing arm are each hinged to one end of a transmission rod. The inner ends of the two front push-pull rods and the two rear push-pull rods are each hinged to a third hinge shaft. The other ends of the two transmission rods are movably connected to the two third hinge shafts. The upper ends of the two third hinge shafts are slidably mounted on the main hanger beam. The third hinge shafts can slide along the main hanger beam but cannot detach from it. The two front push-pull rods... The outer ends of the two push-pull rods on the rear side are hinged to the left and right sides of the folding frame on their respective sides. This allows the two push-pull rods connected to the folding frame to prevent the folding frame from rotating as a whole around its first hinge axis, but does not prevent the folding frame from folding or unfolding. When any folding frame is folded or unfolded, the folding frame can drive the corresponding third hinge axis to move along the main hanging beam through the two push-pull rods connected to it. At the same time, it can drive the third hinge axis on the other side to move along the main hanging beam through the two transmission rods and the swing rod. The third hinge axis on the other side can then drive the other folding frame through the push-pull rod connected to it, so that the two folding frames can be folded or unfolded synchronously.

[0012] Furthermore, in the aforementioned main frame of a coating production line, the two push-pull rods on the front side and the two push-pull rods on the rear side are coaxially connected to two short connecting rods close to each other on their respective sides to form a single rod.

[0013] Furthermore, in the aforementioned main hanger of a coating production line, the installation structure between the third hinge shaft and the main hanger beam is as follows: a chuck is provided on the top of the third hinge shaft, and a slot arranged along the main hanger beam is provided on the side wall of the main hanger beam. The chuck can slide along the slot and be engaged in the slot, so that the third hinge shaft can slide along the main hanger beam, but cannot detach from the main hanger beam.

[0014] Furthermore, in the aforementioned main bracket of a coating production line, the crossbar is an L-shaped profile, which includes a horizontal side and a vertical side, and several through holes are provided on the horizontal side and the vertical side respectively. The through holes on the vertical side can serve as hanging parts.

[0015] Furthermore, in the aforementioned main frame of a coating production line, a ruler is also provided on the middle crossbar. One end of the ruler is hinged to the middle crossbar, allowing the ruler to rotate around the hinge point. The ruler can be used to measure the distance between two adjacent crossbars.

[0016] Furthermore, in the aforementioned main hanging frame of a coating production line, there are two pull rope structures, which are respectively installed on the left and right sides of the main hanging beam.

[0017] In addition, the hanging rack can also be at least one horizontal bar, with the horizontal bar and the main hanging beam running in the same direction. Several hanging parts for suspending the workpiece to be painted are set along the bar on the horizontal bar. When there are two or more horizontal bars, the adjacent horizontal bars are installed on the underside of the main hanging beam at a fixed interval.

[0018] The advantages of this invention are as follows: Compared with a single hook hanger, the main hanger has the following advantages: First, because the front and rear ends of the main hanger are constrained by the tension of the wire rope, the main hanger has better balance when hanging workpieces, and the flexible wire rope is not easily deformed, making the main hanger less prone to damage; Second, when the main hanger beam enters an uphill or downhill section under the conveyor chain, the main hanger beam can slide on the wire rope through its two fixed pulleys, thus tending to be horizontal, so that the workpieces on the same main hanger will not collide due to the tilt of the main hanger, and the workpieces on two adjacent main hangers will not collide due to the tilt of the main hanger, thereby eliminating the distance between adjacent main hangers on the conveyor chain. First, the required capacity is large, which greatly increases the number of main hangers on the overhead conveyor chain, thus increasing the number of workpieces and significantly improving production efficiency. Second, because the front and rear ends of the main hangers are restrained by the steel wire ropes, the main hangers are well constrained at the turns of the overhead conveyor chain, preventing them from rotating outwards significantly. This also helps to reduce the distance between adjacent hangers on the overhead conveyor chain, thereby improving production efficiency. Furthermore, it eliminates the need to reserve a large turning space at the turns of the overhead conveyor chain, thus saving valuable production space. Third, the suspension height of the main hangers can be controlled by adjusting the length of the steel wire ropes, making it convenient to match painting production lines with different heights and slopes. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main hanger in the coating production line described in this invention.

[0020] Figure 2 for Figure 1 The diagram shows the structure of the hanging bracket.

[0021] Figure 3 for Figure 1 The diagram shows the structure of the main hanging beam. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0023] like Figure 1 , Figure 2 , Figure 3As shown, a main hanger in a coating production line includes: a main hanger beam 1, with a hanging rack installed below the main hanger beam 1. Workpieces can be suspended on the hanging rack during coating. A pull rope structure is provided on the main hanger beam 1, allowing the main hanger beam to be suspended below the suspended conveyor chain 2 in the coating production line via the pull rope structure. The pull rope structure includes: two fixed pulleys 3 with grooved wheel surfaces and a steel wire rope 4. The two fixed pulleys 3 are respectively fixed to the front and rear ends of the main hanger beam 1. The steel wire rope 4 is wound around the two fixed pulleys 3, and the two ends of the steel wire rope 4 can be connected to the suspended conveyor chain 2 at intervals, so that the main hanger beam 1 can be suspended below the suspended conveyor chain 2 via the steel wire rope 4 and the two fixed pulleys 3. When the main hanger beam 1 enters an uphill or downhill section under the conveying of the suspended conveyor chain 2, the main hanger beam 1 can slide on the steel wire rope 4 via the two fixed pulleys 3, so that the main hanger beam 1 can tend to be horizontal.

[0024] Compared with a single-hook hanger, the main hanger of this invention has the following advantages: First, because the front and rear ends of the main hanger are constrained by the tension of the wire rope, the main hanger has better balance when hanging workpieces, and the flexible wire rope is not easily deformed, making the main hanger less prone to damage; Second, when the main hanging beam 1 enters the uphill or downhill section under the conveyor chain 2, the main hanging beam 1 can slide on the wire rope 4 through its two fixed pulleys 3, thus tending to be horizontal, so that the workpieces on the same main hanger will not collide due to the tilt of the main hanger, and the workpieces on adjacent main hangers will not collide due to the tilt of the main hanger, thus eliminating the need for distance between adjacent main hangers on the conveyor chain 2. First, the main hangers on the suspended conveyor chain 2 can be significantly increased, which in turn increases the number of workpieces and thus greatly improves production efficiency. Second, because the front and rear ends of the main hangers are restrained by the steel wire ropes, the main hangers are well restrained at the turns of the suspended conveyor chain, preventing them from rotating outwards significantly. This also helps to reduce the distance between adjacent hangers on the suspended conveyor chain, thereby improving production efficiency. Furthermore, it eliminates the need to reserve a large turning space at the turns of the suspended conveyor chain, thus saving valuable production space. Third, the suspension height of the main hangers 22 can be controlled by adjusting the length of the steel wire ropes, making it convenient to match painting production lines with different heights and slopes.

[0025] In this embodiment, the hanging frame includes three horizontal bars 5 arranged side-by-side at intervals. In actual manufacturing, the number of horizontal bars 5 can be determined as needed. The horizontal bars 5 and the main hanging beam 1 have the same orientation. Each horizontal bar 5 has several hanging parts along its body for suspending workpieces to be painted. In this embodiment, the hanging parts are hanging holes 6 on the bar body. The three horizontal bars 5 are connected to the main hanging beam 1 via a mounting frame that can extend and retract left and right, allowing the left and right spacing between the three horizontal bars 5 to be adjusted by the left and right extension and retraction of the mounting frame. In this embodiment, the mounting frame that can extend and retract left and right is a scissor-type telescopic mechanism. The scissor-type telescopic mechanism is installed horizontally on the lower side of the main hanging beam 1, and each horizontal bar 5 is connected to the lower side of the scissor-type telescopic mechanism. The spacing between adjacent horizontal bars 5 can be adjusted as the scissor-type telescopic mechanism extends and retracts.

[0026] In this embodiment, the scissor-type telescopic mechanism includes two scissor-type folding frames 7, which are respectively installed below the front and rear ends of the main hanging beam 1. Each folding frame 7 includes two scissor rods 9 and four short connecting rods 10. The two scissor rods 9 are arranged in a crisscross pattern, and the intersection of the two scissor rods 9 is hinged to each other by a first hinge shaft 11, so that the two scissor rods 9 are hinged to form a scissor arm. The upper end of the first hinge shaft 11 is fixed to the end of the main hanging beam 1. The four short connecting rods 10 are located on the left and right sides of the scissor arm in pairs. The two ends of the left side of the scissor arm and the two ends of the right side of the scissor arm are respectively hinged to the inner ends of the two short connecting rods 10 on the same side. The outer ends of the two short connecting rods 10 on the left side and the two short connecting rods 10 on the right side are respectively hinged to a second hinge shaft 12. The connection structure between the three crossbars 5 and the two folding frames 7 is as follows: the middle crossbar 5 is bolted to the lower ends of the two first hinge shafts 11, and the two crossbars 5 on the left and right sides are bolted to the lower ends of the two second hinge shafts 12 on their respective sides; the folding frames 7 can fold or unfold in the left and right directions under the action of external force, so that the left and right distance between the three crossbars 5 can be adjusted.

[0027] The main frame is equipped with three horizontal bars 5 with hanging holes, and the spacing between the three horizontal bars 5 is adjustable. On the one hand, the three horizontal bars 5 with hanging holes allow for the suspension of more workpieces, thereby improving production efficiency. On the other hand, the spacing between the horizontal bars 5 can be adjusted to accommodate workpieces of different sizes and shapes. Furthermore, the multiple horizontal bars 5 with hanging holes provide multiple hanging points for workpieces of various shapes, allowing the workpieces to be easily adjusted to the optimal hanging posture to meet the spraying requirements by connecting to several different hanging points. This not only greatly reduces the variety and specifications of hangers required by spraying production enterprises, reducing the production capital and warehouse space occupied by hangers, but also solves a long-standing industry problem in the spraying industry. Moreover, when the workpieces can be easily adjusted to the optimal hanging posture, it is very beneficial for enterprises to use automatic spraying machines for powder coating operations, thereby greatly reducing the labor intensity of workers and improving production efficiency.

[0028] In this embodiment, a linkage mechanism 8 is also provided to enable the two folding frames 7 to move together. The linkage mechanism 8 is located between the two folding frames 7 and is connected to the two folding frames 7 respectively, so that the two folding frames 7 can be folded or unfolded synchronously.

[0029] The linkage mechanism 8 includes: a swing rod 13, two transmission rods 14, and four push-pull rods 15. The swing rod 13 is located below the main hanging beam 1 and is hinged to the main hanging beam 1 at its middle. The four push-pull rods 15 are located in pairs on the front and rear sides of the swing rod 13. The two ends of the swing rod 13 are respectively hinged to one end of a transmission rod 14. The inner ends of the two front push-pull rods 15 and the two rear push-pull rods 15 are respectively hinged to a third hinge shaft 16. The other ends of the two transmission rods 14 are movably connected to the two third hinge shafts 16. The movable connection means that the third hinge shaft 16 passes through the end of the transmission rod 14, so that the transmission rod 14 is hinged to the two push-pull rods 15 connected to the third hinge shaft 16. The upper ends of the two third hinge shafts 16 are slidably mounted on the main hanging beam 1. The third hinge shafts 16 can slide along the main hanging beam 1, but cannot detach from the main hanging beam 1. The two front push-pull rods 15... The outer ends of the two push-pull rods 15 on the rear side are respectively hinged to the left and right sides of the folding frame 7 on the same side. This structure allows the two push-pull rods 15 connected to the folding frame 7 to prevent the folding frame 7 from rotating as a whole around the first hinge axis 11 on it. This prevents the workers' hanging and spraying work from being affected by the positional misalignment between the crossbars 5, but does not hinder the folding frame 7 from folding or unfolding. When any one of the folding frames 7 is folded or unfolded, the folding frame 7 can drive the corresponding third hinge axis 16 to move along the main hanging beam 1 through the two push-pull rods 15 connected to it. At the same time, it can drive the third hinge axis 16 on the other side to move along the main hanging beam 1 through the two transmission rods 14 and the swing rod 13. The third hinge axis 16 on the other side can drive the other folding frame 7 through the push-pull rod 15 connected to it, so that the two folding frames 7 can be folded or unfolded synchronously.

[0030] When the third hinge shaft 16 on one side moves, it can drive the swing arm 13 to swing through the transmission rod 14 on its side. After the swing arm 13 swings, it can drive the third hinge shaft 16 on the other side to move through the transmission rod 14 on the other side, so that the two third hinge shafts 16 can move inward or outward synchronously.

[0031] In order to enable the folding frame 7 to fold or unfold better, and to enable the two folding frames 7 to synchronize better, and to make it easier to manufacture and install, the two push-pull rods 15 on the front side and the two push-pull rods 15 on the rear side are coaxially connected to the two short connecting rods 10 on the same side to form a single rod.

[0032] In practical applications, the outer ends of the two front push-pull rods 15 and the two rear push-pull rods 15 can be hinged to the ends of the two scissor rods 9 adjacent to each other on the same side; or, the outer ends of the two front push-pull rods 15 and the two rear push-pull rods 15 can be hinged to the inner ends of the two short connecting rods 10 adjacent to each other on the same side; or, the outer ends of the two front push-pull rods 15 and the two rear push-pull rods 15 can be movably connected to two hinge shafts adjacent to each other on the same side, and these two hinge shafts are the hinge shafts of the two scissor rods 9 and the two short connecting rods 10, respectively. The above-mentioned hinged connection between the push-pull rods 15 and the folding frame 7 can also prevent the folding frame 7 from rotating as a whole and enable the two folding frames 7 to move together. These conventional structural changes should still fall within the protection scope of this invention.

[0033] In actual production, the number of crossbars 5 can be set to two. During installation, the two crossbars 5 are respectively connected to the lower ends of the two second hinge shafts 12 on their respective sides. Of course, the two crossbars 5 can also be installed below the main hanging beam 1 using other commonly used foldable telescopic mechanisms; these conventional variations are still within the scope of protection of this invention. The number of crossbars 5 can also be five or seven, as long as a scissor structure that can connect the crossbars 5 is added to the scissor-type telescopic mechanism.

[0034] In actual production, the hanging frame can also be configured with only one horizontal bar 5, which runs in the same direction as the main hanging beam 1. The horizontal bar 5 is directly fixed to the lower part of the main hanging beam 1, and several hanging parts for suspending workpieces to be coated are provided along the bar body. Alternatively, the hanging frame can also include two or more horizontal bars 5, which are installed at fixed intervals on the lower side of the main hanging beam 1. These conventional variations are still within the protection scope of this invention.

[0035] In this embodiment, the installation structure between the third hinge shaft 16 and the main hanging beam 1 is as follows: a chuck 17 is provided on the top of the third hinge shaft 16. In actual manufacturing, the chuck can be a freely rotating roller. A slot 18 arranged along the main hanging beam 1 is provided on the lower side wall of the main hanging beam 1. The chuck 17 can slide along the slot 18 and be locked in the slot 18, so that the third hinge shaft 16 can slide along the main hanging beam 1, but cannot detach from the main hanging beam 1.

[0036] In actual manufacturing, the crossbar 5 is an L-shaped profile—such as angle steel. The L-shaped profile includes a horizontal side and a vertical side, with several through holes on both sides. The through holes along the horizontal side can serve as mounting holes 19 for fixing to the folding frame 7, or as hanging holes 6 for hanging workpieces. The through holes on the vertical side are usually used as hanging holes 6. This type of crossbar 5 is easy to manufacture and has low manufacturing costs. In addition, in actual manufacturing, besides providing hanging holes 6 on the crossbar 5 as hanging parts for suspending workpieces, hanging rings, hanging hooks, hanging short handles, etc., can also be provided on the crossbar as hanging parts. These variations are still within the protection scope of this invention.

[0037] In this embodiment, a ruler 20 is also provided on the middle crossbar 5. One end of the ruler 20 is hinged to the middle crossbar 5, allowing the ruler 20 to rotate around the hinge point. The ruler 20 can be used to measure the distance between two adjacent crossbars 5. This arrangement makes it convenient for workers to accurately adjust the distance between the crossbars 5.

[0038] In practical applications, two rope structures are installed side-by-side on the left and right sides of the main hanging beam 1. This arrangement makes the main hanging frame more stable in the left and right directions. In actual use, to facilitate the main hanging frame being suspended below the suspended conveyor chain 2, hook seats are hinged to the links of the suspended conveyor chain 2. A hook is installed at each end of the two steel wire ropes. When the main hanging frame is suspended on the suspended conveyor chain 2, the hooks at the front ends of the two steel wire ropes hook onto the front hook seats, and the hooks at the rear ends of the two steel wire ropes hook onto the rear hook seats.

[0039] In electrostatic spraying, some of the paint powder is adsorbed onto the main hanger to form a coating. As the main hanger is used more often, the coating on the hanging holes of the crossbar 5 becomes thicker and thicker. When the crossbar 5 cannot conduct electricity normally with the hanger due to the coating blocking the hanging holes, the workpiece will not be electrified, and electrostatic spraying will not be possible. In this case, the main hanger does not need to be de-plasticized to remove the coating; only the crossbar 5 needs to be replaced for continued use. This greatly reduces the frequency of de-plasticizing the main hanger, thus significantly reducing production costs and environmental pollution. The processing cost of the crossbar 5 is also low. The coating in the hanging holes can be removed by enlarging the holes on the crossbar 5, allowing the crossbar 5 to be reused. The operation is simple and labor-saving, and it also greatly reduces environmental pollution.

Claims

1. A main support frame in a coating production line, comprising: The main hanging beam is characterized by: a hanging frame installed below the main hanging beam, on which workpieces can be suspended during painting; and a rope structure provided on the main hanging beam, allowing it to be suspended below the overhead conveyor chain in the painting production line. The rope structure includes: two fixed pulleys and a steel wire rope. The two fixed pulleys are respectively fixed to the front and rear ends of the main hanging beam, and the steel wire rope is wound around the two fixed pulleys, with both ends of the steel wire rope being connected to the overhead conveyor chain at intervals, thereby allowing the main hanging beam to be suspended below the overhead conveyor chain via the steel wire rope and the two fixed pulleys. The wheels are suspended below the overhead conveyor chain. When the main beam enters an uphill or downhill section under the conveyor chain, it slides on the wire rope via two fixed pulleys, allowing it to maintain a horizontal position. The hanging frame includes at least two horizontal bars arranged side-by-side at intervals. The horizontal bars run in the same direction as the main beam. Each horizontal bar has several hanging parts along its length for suspending workpieces to be coated. Each horizontal bar is connected to the main beam via a mounting bracket that can extend and retract left and right, allowing the horizontal spacing between adjacent horizontal bars to be extended. The spacing can be adjusted by the folding or unfolding telescopic movement of the mounting frame in the left and right directions; the telescopic mounting frame is a scissor-type telescopic mechanism, which is installed horizontally on the underside of the main hanging beam. Each crossbar is connected to the underside of the scissor-type telescopic mechanism, and the spacing between adjacent crossbars can be adjusted as the scissor-type telescopic mechanism extends and retracts; the structure of the scissor-type telescopic mechanism includes: two scissor-type folding frames, which are respectively installed below the front and rear ends of the main hanging beam. Each folding frame includes: two... The system consists of a scissor lift and four short connecting rods. Two scissor lifts are arranged in a crisscross pattern, and the intersection of the two scissor lifts is hinged together by a first hinge shaft, forming a scissor arm. The upper end of the first hinge shaft is fixed to the end of the main suspension beam. The four short connecting rods are located on the left and right sides of the scissor arm in pairs. The two ends of the left side of the scissor arm and the two ends of the right side of the scissor arm are hinged to the inner ends of the two short connecting rods on their respective sides. The outer ends of the two short connecting rods on the left side and the two short connecting rods on the right side are hinged together by a second hinge shaft.

2. The main support frame in a coating production line according to claim 1, characterized in that: There are two crossbars, and the lower ends of the two second hinge shafts on their respective sides are connected to each other. The folding frame can be folded or unfolded in the left and right directions under the action of external force, so that the left and right distance between the two crossbars can be adjusted.

3. The main hanging frame in a coating production line according to claim 1, characterized in that: There are three crossbars. The middle crossbar is connected to the lower end of the first hinge shaft, and the two crossbars on the left and right sides are connected to the lower ends of the two second hinge shafts on their respective sides. The folding frame can be folded or unfolded in the left and right directions under the action of external force, so that the left and right distance between the three crossbars can be adjusted.

4. The main hanging frame in a coating production line according to claim 1, 2, or 3, characterized in that: It is also equipped with a linkage mechanism that enables the two folding frames to move together. The linkage mechanism is located between the two folding frames and connected to them, so that the two folding frames can be folded or unfolded synchronously.

5. The main hanging frame in a coating production line according to claim 4, characterized in that: The linkage mechanism includes: one swing arm, two transmission rods, and four push-pull rods. The swing arm is located below the main suspension beam and its middle section is hinged to the main suspension beam. The four push-pull rods are located in pairs on the front and rear sides of the swing arm. Each end of the swing arm is hinged to one end of a transmission rod. The inner ends of the two front push-pull rods and the two rear push-pull rods are each hinged to a third hinge shaft. The other ends of the two transmission rods are movably connected to the two third hinge shafts. The upper ends of the two third hinge shafts are slidably mounted on the main suspension beam. The third hinge shafts can slide along the main suspension beam but cannot detach from it. The outer ends of the two front push-pull rods and the two rear push-pull rods... Each folding frame is hinged to the left and right sides of its respective side, so that the two push-pull rods connected to the folding frame can prevent the folding frame from rotating as a whole around its first hinge axis, but do not hinder the folding frame from folding or unfolding. When any folding frame is folded or unfolded, the folding frame can drive the corresponding third hinge axis to move along the main hanging beam through the two push-pull rods connected to it. At the same time, it can drive the third hinge axis on the other side to move along the main hanging beam through the two transmission rods and the swing rod. The third hinge axis on the other side can drive the other folding frame through the push-pull rod connected to it, so that the two folding frames can be folded or unfolded synchronously.

6. The main hanging frame in a coating production line according to claim 5, characterized in that: The two push-pull rods on the front and the two push-pull rods on the back are coaxially connected to the two short connecting rods on their respective sides to form a single rod.

7. The main hanging frame in a coating production line according to claim 5, characterized in that: The installation structure between the third hinge shaft and the main hanging beam is as follows: a chuck is provided on the top of the third hinge shaft, and a slot arranged along the main hanging beam is provided on the side wall of the main hanging beam. The chuck can slide along the slot and be engaged in the slot, so that the third hinge shaft can slide along the main hanging beam, but cannot detach from the main hanging beam.

8. The main hanger in a coating production line according to claim 1, 2, or 3, characterized in that: The crossbar is an L-shaped profile, which includes a horizontal side and a vertical side. Several through holes are provided on the horizontal side and the vertical side respectively. The through holes on the vertical side can be used as hanging parts.

9. The main hanging frame in a coating production line according to claim 3, characterized in that: A ruler is also installed on the middle crossbar. One end of the ruler is hinged to the middle crossbar, allowing the ruler to rotate around the hinge point. The ruler can be used to measure the distance between two adjacent crossbars.

10. The main hanger in a coating production line according to claim 1, 2, or 3, characterized in that: There are two rope-pulling structures, which are installed on the left and right sides of the main hanging beam, respectively.

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