A material conveying device for a paint spraying line

Abstract

The present application discloses a material conveying device for a paint spraying line, which relates to the technical field of furniture painting, improves the waste of paint, and includes a mounting frame and a first conveyor belt mounted on the mounting frame; a second conveyor belt for conveying workpieces into a powder spraying room and a powder curing area is mounted on the mounting frame; a guide rail and a support frame mounted on the guide rail are mounted on the mounting frame, a slider is mounted on a hanging rod, the hanging rod slides up and down and is mounted on the slider, the hanging rod is connected with a connecting block, and the hanging rod is sleeved with a reset spring; the connecting block is provided with a protrusion, the first conveyor belt is provided with a first push block for pushing the protrusion, the second conveyor belt is provided with a second push block for pushing the protrusion, a first sensor for sensing whether the workpiece enters the powder spraying room is installed on the mounting frame, and a controller for controlling whether the powder spraying room is spraying paint is installed, and the first sensor is connected to the controller. The present application enables the powder spraying room to stop spraying when sensing that no workpiece enters, thereby reducing the waste of paint.

Description

Technical Field

[0001] The present application relates to the technical field of furniture painting, and in particular to a material conveying device for a painting line. Background Art

[0002] Furniture spraying is the most commonly used coating method today. The current spraying line includes a loading area and an unloading area, as well as a track, a powder spray room, and a powder curing furnace. The track passes through the loading area, the powder spray room, the powder curing area, and the unloading area in sequence. After passing through the unloading area, the track is connected to the track in the loading area, so the entire track forms a closed loop. There are multiple hooks for furniture parts to be hung at intervals on the track. When the furniture parts are made, the furniture parts are hung on the hooks in the loading area. The track carries the furniture parts for painting and then unloads them in the unloading area, so that the hooks return to the loading area.

[0003] With regard to the above-mentioned related technologies, the inventor believes that when the hook passes through the loading area, if the loading operator does not hang the furniture parts on the hook, the hook will also leave the loading area, so that when the hook passes through the powder spray room, the powder spray room will have to spray paint on the hook that does not have the furniture parts hung on it, thereby resulting in a waste of paint. Summary of the invention

[0004] In order to reduce the waste of paint in a paint spraying line, the present application provides a material conveying device for a paint spraying line.

[0005] The present application provides a material conveying device for a paint spraying line, which adopts the following technical solution:

[0006] A material conveying device for a painting line is arranged on the painting line, comprising a mounting frame and a first conveyor belt mounted on the mounting frame, a first driving mechanism for driving the first conveyor belt to continuously move is installed on the mounting frame, a loading area and a discharging area of ​​the painting line are symmetrically distributed about the central axis of the first driving gear, and the first conveyor belt passes through the discharging area and the loading area in sequence;

[0007] The mounting frame is provided with a second conveyor belt for conveying workpieces into the powder spraying room and the powder curing area, the first conveyor belt is located above the second conveyor belt, the second conveyor belt passes through the loading area, the powder spraying room, the powder curing area and the unloading area in sequence, and the mounting frame is provided with a second driving mechanism for driving the second conveyor belt to continuously convey;

[0008] The mounting frame is provided with a guide rail and a support frame installed on the guide rail, the guide rail passes through the loading area, the powder spray room, the powder curing area and the unloading area in sequence, the guide rail surrounds the first conveyor belt and the second conveyor belt, the support frame includes a hanging rod and a hook connected to the hanging rod, the hanging rod is provided with a slider for sliding with the guide rail, the hanging rod is slidably installed on the slider up and down, the end of the hanging rod away from the hook is connected with a connecting block, the hanging rod is sleeved with a reset spring driving the hanging rod to always have an upward trend, and the reset spring is located between the connecting block and the slider;

[0009] A protrusion is provided on one side of the connecting block close to the first conveyor belt, a first push block for pushing the protrusion is installed on one side of the first conveyor belt close to the guide rail, the first push blocks are evenly spaced along the conveying direction of the first conveyor belt, a second push block for pushing the protrusion is installed on one side of the second conveyor belt close to the guide rail, the second push blocks are evenly spaced along the conveying direction of the second conveyor belt, the conveying speeds of the first conveyor belt and the second conveyor belt are the same, the first push block and the second push block are offset from each other, when the workpiece is installed on the hook, the connecting block presses down the reset spring to bring the protrusion into between two adjacent second push blocks, when the support frame moves to the unloading area with the workpiece and the workpiece leaves the hook, the reset spring drives the protrusion into between two adjacent first push blocks;

[0010] A stopper for blocking the connecting block is provided near the first transmission gear in the upper piece area. When the protrusion is located between the two first push blocks, the connecting block of the stopper abuts against the stopper. A push rod for pushing the push block is slidably installed on the first push block. The first push block is provided with a receiving groove for accommodating the push rod. A driving spring for driving part of the push rod to leave the receiving groove is fixedly connected to the inner wall of the receiving groove. An inclined surface is provided at the end of the push rod extending out of the receiving groove. When the push rod pushes the protrusion, the protrusion abuts against the inclined surface. A first sensor for sensing whether a workpiece enters the powder spray room and a controller for controlling whether the powder spray room is spraying paint are installed on the mounting frame. The first sensor is connected to the controller.

[0011] By adopting the above technical solution, after the workpiece is taken out of the support rack in the unloading area, the reset spring drives the protrusion to move upward so that the protrusion enters between the first push blocks, and the first push rod can push the protrusion to move the support rack from the unloading area to the loading area. In the loading area, the workpiece is hung on the hook of the support rack, and the workpiece presses down the reset spring through its own gravity, so that the connecting block brings the protrusion into between the second push blocks, and the second conveyor belt conveys the workpiece into the powder spray room and the powder curing area and then into the unloading area;

[0012] If the support rack moves to the loading area and the operator forgets to hang the workpiece on the support rack, the connecting block abuts against the stopper, and the inclined surface of the push rod slides in contact with the protrusion, so that the push rod squeezes the driving spring back into the accommodating groove, so that the first conveyor belt can keep moving, the support rack can be accumulated in the loading area, and the second conveyor belt will not carry the support rack without the workpiece hung into the powder spray room. When the first sensor senses that no workpiece enters the powder spray room, the first sensor transmits a signal to the controller, and the controller stops spraying paint in the powder spray room, so that the paint in the powder spray room is basically sprayed on the workpiece, reducing the waste of paint in the paint spraying line, and when the support rack without the workpiece hung enters the powder spray room, the second conveyor belt can continue to carry the support rack with the workpiece hung before for spraying paint, so that the second conveyor belt can also keep moving continuously.

[0013] Optionally, a second sensor for sensing whether the protrusion is located between the first push blocks is provided on the mounting frame, the second sensor is located between the unloading area and the loading area, and an alarm connected to the second sensor is installed on the mounting frame.

[0014] By adopting the above technical solution, if the operator in the unloading area fails to unload the materials in time, when the second sensor senses that the protrusion is not between the first push blocks, the second sensor triggers the alarm to remind people.

[0015] Optionally, the guide rail includes an inner rail close to the second conveyor belt and an outer rail away from the second conveyor belt, a gap is left between the inner rail and the outer rail for the hanging rod to pass through, and the hanging rod is slidably connected in the gap.

[0016] By adopting the above technical solution, the inner rail and the outer rail can guide the hanging rod, so that the hanging frame can only move along the guide rail.

[0017] Optionally, a groove is provided on one side of the inner rail and the outer rail close to each other, and the slider is slidably installed in the groove, and the groove is arranged along the sliding direction of the slider.

[0018] By adopting the above technical solution, the sink groove can limit the sliding block.

[0019] Optionally, a through groove is provided on the side of the outer rail facing away from the inner rail for allowing the hanging rod to leave the guide rail. There are multiple through grooves, which are distributed in the loading area. The through grooves are connected to the sink groove and the slide groove, and a connecting rod is connected between the outer rail and the mounting frame between two adjacent through grooves.

[0020] By adopting the above technical solution, when the supporting frame without a workpiece hung on it slides to the upper workpiece area, the connecting block is blocked by the blocking block, and the supporting frame can be moved upward. When the sliding block leaves the sink groove, the hanging rod can leave the through groove, so that the sliding block can slide with the supporting frame, and the supporting frame can also be limited so that the supporting frame can only slide stably on the guide rail.

[0021] Optionally, the first driving mechanism includes a first driving gear and a driving source for driving the first driving gear to rotate, the first driving mechanism also includes a first transmission gear, the first transmission gear is rotatably mounted on a mounting frame, the first conveyor belt is installed between the first driving gear and the first transmission gear, and the first conveyor belt is provided with a tooth groove for the first driving gear and the first transmission gear to be plugged in.

[0022] By adopting the above technical solution, the gear teeth of the first driving gear cooperate with the tooth grooves of the first conveyor belt, and the first transmission gear guides the first conveyor belt.

[0023] Optionally, the second driving mechanism includes a second driving gear and a driving source for driving the second driving gear to rotate, the second driving gear is located below the first driving gear and is coaxial with the first driving gear, the second driving mechanism also includes a second transmission gear rotatably mounted on the mounting frame, and the second conveyor belt is provided with a tooth groove for plugging the gear teeth of the second driving gear and the second transmission gear.

[0024] By adopting the above technical solution, the gear teeth of the second driving gear cooperate with the tooth grooves of the second conveyor belt, and the second transmission gear guides the second conveyor belt.

[0025] Optionally, the first driving gear is connected to a rotating shaft, the rotating shaft is connected to a driving source, and the second driving gear and the first driving gear share a rotating shaft.

[0026] By adopting the above technical solution, the second driving gear and the first driving gear share a rotating shaft, so that the first driving gear and the second driving gear can better maintain the same speed of movement.

[0027] By adopting the above technical solution, the first pushing block and the second pushing block are staggered with each other.

[0028] Optionally, the first push block and the second push block are offset from each other, and when the protrusion leaves the first push block, it can fall between the two second push blocks, and when the protrusion leaves the second push block, the protrusion can be located between the second push blocks, making it convenient for the protrusion to approach the first push block or the second push block.

[0029] In summary, the present application includes at least one of the following beneficial effects:

[0030] 1. When there is no workpiece hanging on the support rack in the loading area, the support rack remains in the loading area, and the powder spraying room stops spraying when it senses that there is no workpiece entering, thereby reducing the waste of paint;

[0031] 2. When the support racks are piled up in the loading area, the first conveyor belt and the second conveyor belt can keep moving, so that the workpieces that have entered the powder spray room can be painted and dried as usual. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0033] Figure 2 It is a top view of the unloading area, loading area, powder spray room and powder curing area of ​​the embodiment of the present application;

[0034] Figure 3 is a cross-sectional view showing that the first driving gear and the second driving gear are coaxial in the embodiment of the present application;

[0035] Figure 4 yes Figure 1 A magnified schematic diagram of point A;

[0036] Figure 5 yes Figure 3 An enlarged schematic diagram of point B;

[0037] Figure 6 Schematic diagram of a first driving mechanism and a second driving mechanism.

[0038] Explanation of the accompanying drawings: 1. unloading area; 2. loading area; 3. powder spray room; 4. powder curing area; 5. first conveyor belt; 51. first push block; 511. push rod; 512. accommodating groove; 513. driving spring; 6. supporting frame; 61. hanging rod; 611. sliding block; 612. connecting block; 6121. protrusion; 613. reset spring; 614. receiving block; 62. hook; 7. second conveyor belt; 71. second push block; 8. first driving mechanism; 81. first driving gear; 82. first transmission gear; 83. driving source; 9. second driving mechanism; 91. second driving gear; 92. second transmission gear; 10. guide rail; 101. inner rail; 102. outer rail; 103. sink; 104. through groove; 20. mounting frame; 201. baffle; 30. second sensor. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-6 This application is described in further detail.

[0040] The present application embodiment discloses a material conveying device for a paint spraying line. Figure 1 and Figure 2 A material conveying device for a paint spraying line is arranged on the paint spraying line, and the unloading area 1 and the loading area 2 of the paint spraying line are adjacent. A material conveying device for a paint spraying line comprises a mounting frame 20 mounted on a ceiling and a guide rail 10 mounted on the mounting frame 20, and a plurality of supporting and hanging frames 6 for hanging workpieces are slidably mounted on the guide rail 10, and the supporting and hanging frames 6 are distributed at intervals. The guide rail 10 is in a closed loop shape, and the guide rail 10 passes through the loading area 2, the powder spraying room 3, the powder curing area 4 and the unloading area 1 in sequence.

[0041] Reference Figure 1 and Figure 2 The material conveying device further includes a first conveyor belt 5 for driving the support frame 6 to move from the unloading area 1 to the loading area 2, and the first conveyor belt 5 passes through the unloading area 1 and the loading area 2 in sequence. The first conveyor belt 5 is located in the guide rail 10. A first push block 51 for pushing the support frame 6 is fixedly connected to a side of the first conveyor belt 5 close to the guide rail 10, and the first push blocks 51 are evenly spaced along the conveying direction of the first conveyor belt 5. The support frame 6 includes a hanging rod 61 and a hook 62 connected to the lower end of the hanging rod 61.

[0042] Reference Figure 2 and Figure 3 The hanging rod 61 is provided with a slider 611 for sliding connection with the guide rail 10, and the hanging rod 61 can be slidably installed on the slider 611 up and down. The end of the hanging rod 61 away from the hook 62 is also connected to a connecting block 612, and the hanging rod 61 is sleeved with a return spring 613 for driving the hook 62 to always have an upward trend, and the return spring 613 is a compression spring. One end of the return spring 613 abuts against the slider 611, and the other end of the return spring 613 abuts against the connecting block 612. A protrusion 6121 is connected to the side of the connecting block 612 close to the first conveyor belt 5, and the first push block 51 pushes the support frame 6 through the protrusion 6121.

[0043] Reference Figure 2 and Figure 3 The mounting frame 20 is also provided with a second conveyor belt 7 for driving the support frame 6 carrying the workpiece into the powder spraying room 3 and the powder curing area 4. The second conveyor belt 7 passes through the loading area 2, the powder spraying room 3, the powder curing area 4 and the unloading area 1 in sequence. The second conveyor belt 7 is located below the first conveyor belt 5, and the second conveyor belt 7 is also surrounded by the guide rail 10. A second push block 71 is fixedly connected to one side of the second conveyor belt 7 close to the guide rail 10, and the second push blocks 71 are evenly spaced along the conveying direction of the second conveyor belt 7. When the workpiece is mounted on the support frame 6, the connection block 612 presses down the reset spring 613 to make the protrusion 6121 enter between two adjacent second push blocks 71, so that the second conveyor belt 7 can push the support frame 6 through the second push block 71.

[0044] Reference Figure 4 The mounting frame 20 is provided with a baffle 201 for blocking the connection block 612, and the baffle 201 is located at the upper workpiece area 2. When the support frame 6 is pushed to the upper workpiece area 2 by the first push block 51, the connection block 612 abuts against the baffle 201 when the support frame 6 is not hung with a workpiece, so that the support frame 6 cannot move any further.

[0045] The mounting frame 20 is provided with a first sensor (not shown in the figure) for sensing whether the workpiece enters the powder spraying room 3, and the first sensor is between the powder spraying room 3 and the loading area 2. The mounting frame 20 is also provided with a controller (not shown in the figure) for controlling whether the powder spraying room 3 is spraying paint. When the support frame 6 enters the powder spraying room 3 without the second conveyor belt 7, the first sensor transmits a signal to the controller, so that the powder spraying room 3 stops spraying paint, and the paint is basically sprayed on the workpiece, thereby reducing the waste of paint.

[0046] Reference Figure 4 and Figure 5 A push rod 511 for pushing the protrusion 6121 is slidably mounted on the first push block 51. A receiving groove 512 for receiving the push rod 511 is provided on the first push block 51. A driving spring 513 for driving a portion of the push rod 511 to extend out of the receiving groove 512 is fixedly connected to the inner bottom wall of the receiving groove 512. The portion of the push rod 511 extending out of the receiving groove 512 is provided with an inclined surface. When the first push block 51 pushes the protrusion 6121, the protrusion 6121 abuts on the inclined surface. When the connecting block 612 abuts on the stopper, the push rod 511 is slidably connected to the protrusion 6121 through the inclined surface, so that the push rod 511 squeezes the driving spring 513 to leave the protrusion 6121, and the first conveyor belt 5 can maintain a continuous conveying state.

[0047] Reference Figure 6 The mounting frame 20 is provided with a first driving mechanism 8 for driving the first conveyor belt 5 to continuously move. The first driving mechanism 8 includes a first driving gear 81 and a driving source 83 for driving the first driving gear 81 to rotate. The driving source 83 is a motor, and the motor is mounted on the mounting frame 20. A rotating shaft is connected to the center of the first driving gear 81, and the output shaft of the motor is fixedly connected to the rotating shaft. The first conveyor belt 5 is provided with tooth grooves for the first driving gear 81 to be inserted into the tooth grooves, and the tooth grooves are evenly spaced along the conveying direction of the first conveyor belt 5. The first driving mechanism 8 also includes a first transmission gear 82, and the first transmission gear 82 is spaced apart from the first driving gear 81. The first transmission gear 82 can guide the first conveyor belt 5 so that the first conveyor belt 5 can move stably. The number of teeth of the first transmission gear 82 is the same as that of the first driving gear 81, and the teeth of the first transmission gear 82 are also inserted into the tooth grooves of the first conveyor belt 5.

[0048] Reference Figure 3 and Figure 6A second driving mechanism 9 for driving the second conveyor belt 7 to continuously convey is installed on the mounting frame 20. The second driving mechanism 9 includes a second driving gear 91 and a driving source 83 for driving the second driving gear 91 to rotate. The driving source 83 of the first driving mechanism 8 and the second driving mechanism 9 is the same. The second driving gear 91 is fixedly connected to the rotating shaft, and the second driving gear 91 is coaxially arranged with the first driving gear 81, so the conveying speed of the first conveyor belt 5 and the second conveyor belt 7 is the same. The second driving mechanism 9 also includes a second transmission gear 92, which is rotatably mounted on the mounting frame 20. The second conveyor belt 7 is provided with a tooth groove for the gear teeth of the second driving gear 91 and the second transmission gear 92 to be plugged in.

[0049] Reference Figure 6 , the first push block 51 and the second push block 71 are misaligned with each other, and when the protrusion 6121 leaves the first push block 51, the second push block 71 can gradually approach the protrusion 6121 and push the protrusion 6121. When the protrusion 6121 leaves the second push block 71, the first push block 51 can gradually approach the protrusion 6121 and push the protrusion 6121.

[0050] Reference Figure 1 and Figure 2 The mounting frame 20 is provided with a second sensor 30 and an alarm (not shown in the figure) connected to the second sensor 30. The second sensor 30 is located between the unloading area 1 and the loading area 2.

[0051] When the support rack 6 passes through the second sensor 30, the second sensor 30 is used to sense whether the protrusion 6121 is located in the first push block 51. If the support rack 6 passes through the unloading area 1 with the workpiece and the workpiece does not leave the unloading area 1, the protrusion 6121 is still pushed by the second push block 71. When the second sensor 30 senses that the support rack 6 passes but does not sense that the protrusion 6121 is located between the first push blocks 51, the second sensor 30 transmits a signal to the alarm, so that the alarm can sound an alarm, thereby reminding people that the workpiece on the support rack 6 has not been unloaded.

[0052] Reference Figure 4 and Figure 5The guide rail 10 includes an inner rail 101 close to the second conveyor belt 7 and an outer rail 102 away from the second conveyor belt 7. A gap is left between the inner rail 101 and the outer rail 102 for the hanging rod 61 to pass through, and the peripheral side of the hanging rod 61 is slidably connected in the gap. A sinking groove 103 is provided on the side where the inner rail 101 and the outer rail 102 are close to each other, and the sinking groove 103 is arranged along the conveying direction of the support frame 6. The slider 611 is slidably installed in the sinking groove 103, so that the slider 611 is also limited. A through groove 104 is provided on the side of the outer rail 102 away from the inner rail 101 for the connecting rod to slide out of the guide rail 10, and the through groove 104 is connected to the sinking groove 103. There are multiple through grooves 104, and the through grooves 104 are distributed in the loading area. A connecting rod is connected between the outer rail 102 and the mounting frame 20 between two adjacent through grooves 104. A receiving block 614 is fixedly mounted on the hanging rod 61 for pushing the slider 611 upward. When the hanging rack 6 abuts against the stopper and the hanging rack 6 needs to be replaced, the hanging rack 6 is lifted up so that the receiving block 614 pushes the slider 611 upward to leave the sink 103. The hanging rod 61 can leave the guide rail 10 from the through slot 104, making it convenient for people to replace the hanging rack 61.

[0053] The implementation principle of a material conveying device for a paint spraying line in the embodiment of the present application is as follows:

[0054] When the support rack 6 is hung with a workpiece, the second push block 71 of the second conveyor belt 7 pushes the support rack 6 to move, so that the support rack 6 can pass through the powder spray room 3, the powder curing area 4 and the unloading area 1 in sequence. When the workpiece is unloaded in the unloading area 1, the first push block 51 of the first conveyor belt 5 pushes the support rack 6 back to the loading area 2. If the support rack 6 is not hung with a workpiece in the loading area 2, the support rack 6 will no longer enter the powder spraying area with the second conveyor belt 7. When no workpiece passes through the powder spray room 3, the first sensor can trigger the controller to stop spraying paint in the powder spray room 3, thereby reducing the waste of paint.

[0055] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A material conveying device for a paint spraying line, arranged on the paint spraying line, characterized in that: The invention comprises a mounting frame (20) and a first conveyor belt (5) mounted on the mounting frame (20); a first driving mechanism (8) for driving the first conveyor belt (5) to continuously move is mounted on the mounting frame (20); a loading area (2) and a discharging area (1) of the painting line are symmetrically distributed about the central axis of a first driving gear (81); and the first conveyor belt (5) passes through the discharging area (1) and the loading area (2) in sequence; The mounting frame (20) is provided with a second conveyor belt (7) for conveying workpieces into the powder spraying room (3) and the powder solidification area (4); the first conveyor belt (5) is located above the second conveyor belt (7); the second conveyor belt (7) passes through the loading area (2), the powder spraying room (3), the powder solidification area (4) and the unloading area (1) in sequence; the mounting frame (20) is provided with a second driving mechanism (9) for driving the second conveyor belt (7) to continuously convey; A guide rail (10) and a support frame (6) mounted on the guide rail (10) are mounted on the mounting frame (20). The guide rail (10) passes through the loading area (2), the powder spraying room (3), the powder curing area (4) and the unloading area (1) in sequence. The guide rail (10) surrounds the first conveyor belt (5) and the second conveyor belt (7). The support frame (6) comprises a hanging rod (61) and a hook (62) connected to the hanging rod (61). The hanging rod (61) is equipped with a slider (611) for sliding with the guide rail (10). The hanging rod (61) is mounted on the slider (611) to slide up and down. The end of the hanging rod (61) away from the hook (62) is connected to a connecting block (612). The hanging rod (61) is sleeved with a return spring (613) for driving the hanging rod (61) to always have an upward trend. The return spring (613) is located between the connecting block (612) and the slider (611). A protrusion (6121) is provided on one side of the connecting block (612) close to the first conveyor belt (5); a first push block (51) for pushing the protrusion (6121) is installed on one side of the first conveyor belt (5) close to the guide rail (10); the first push blocks (51) are evenly spaced along the conveying direction of the first conveyor belt (5); a second push block (71) for pushing the protrusion (6121) is installed on one side of the second conveyor belt (7) close to the guide rail (10); the second push blocks (71) are evenly spaced along the conveying direction of the second conveyor belt (7). The first conveyor belt (5) and the second conveyor belt (7) have the same conveying speed, the first push block (51) and the second push block (71) are offset from each other, when the workpiece is mounted on the hook (62), the connection block (612) presses down the return spring (613) to bring the protrusion (6121) into between two adjacent second push blocks (71), and when the support frame (6) moves with the workpiece to the unloading area (1), and the workpiece leaves the hook (62), the return spring (613) drives the protrusion (6121) into between two adjacent first push blocks (51); A stopper for blocking the connecting block (612) is provided near the first transmission gear (82) in the upper part area (2); when the protrusion (6121) is located between the two first push blocks (51), the connecting block (612) of the stopper abuts against the stopper; a push rod (511) for pushing the push block is slidably mounted on the first push block (51); the first push block (51) is provided with a receiving groove (512) for receiving the push rod (511); an inner wall of the receiving groove (512) is fixedly connected with a push rod (511) for driving the push rod (511); A driving spring (513) causes part of the push rod (511) to leave the receiving groove (512); an end of the push rod (511) extending out of the receiving groove (512) is provided with an inclined surface; when the push rod (511) pushes the protrusion (6121), the protrusion (6121) abuts against the inclined surface; a first sensor for sensing whether a workpiece has entered the powder spray room (3) and a controller for controlling whether the powder spray room (3) is spraying paint are installed on the mounting frame (20); and the first sensor is connected to the controller.

2. The material conveying device for a paint spraying line according to claim 1, characterized in that: The mounting frame (20) is provided with a second sensor for sensing whether the protrusion (6121) is located between the first push block (51), the second sensor being located between the unloading area (1) and the loading area (2), and an alarm connected to the second sensor being installed on the mounting frame (20).

3. The material conveying device for a paint spraying line according to claim 1, characterized in that: The guide rail (10) comprises an inner rail (101) close to the second conveyor belt (7) and an outer rail (102) away from the second conveyor belt (7), and a gap is left between the inner rail (101) and the outer rail (102) for the hanging rod (61) to pass through.

4. The material conveying device for a paint spraying line according to claim 3 is characterized in that: A sink groove (103) is provided on the side where the inner rail (101) and the outer rail (102) are close to each other. The sliding block (611) is slidably installed in the sink groove (103). The sink groove (103) is arranged along the sliding direction of the sliding block (611).

5. The material conveying device for a paint spraying line according to claim 4, characterized in that: A through slot (104) for allowing the hanging rod (61) to leave the guide rail (10) is provided on a side of the outer rail (102) facing away from the inner rail (101), wherein a plurality of through slots (104) are provided, and the through slots (104) are distributed in the loading area, the through slots (104) are connected to the sink (103), and a connecting rod is connected between the outer rail (102) and the mounting frame (20) between two adjacent through slots (104).

6. The material conveying device for a paint spraying line according to claim 1, characterized in that: The first driving mechanism (8) comprises a first driving gear (81) and a driving source (83) for driving the first driving gear (81) to rotate. The first driving mechanism (8) further comprises a first transmission gear (82). The first transmission gear (82) is rotatably mounted on a mounting frame (20). The first conveyor belt (5) is mounted between the first driving gear (81) and the first transmission gear (82). The first conveyor belt (5) is provided with a tooth groove for the first driving gear (81) and the first transmission gear (82) to be plugged into each other.

7. The material conveying device for a paint spraying line according to claim 6, characterized in that: The second driving mechanism (9) comprises a second driving gear (91) and a driving source (83) for driving the second driving gear (91) to rotate. The second driving gear (91) is located below the first driving gear (81) and is coaxial with the first driving gear (81). The second driving mechanism (9) further comprises a second transmission gear (92) rotatably mounted on the mounting frame (20). The second conveyor belt (7) is provided with a tooth groove for the gear teeth of the second driving gear (91) and the second transmission gear (92) to be plugged in.

8. The material conveying device for a paint spraying line according to claim 7, characterized in that: The first driving gear (81) is connected to a rotating shaft, which is connected to a driving source (83); the second driving gear (91) and the first driving gear (81) share a rotating shaft.

9. The material conveying device for a paint spraying line according to claim 1, characterized in that: The first pushing block (51) and the second pushing block (71) are offset from each other.

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