Hardware fitting paint spraying mechanism

By designing the hardware accessories painting mechanism for the angle adjustment component and the nozzle position adjustment component, the problem of cumbersome angle and position adjustment during the hardware accessories spraying process is solved, and convenient spraying effect and paint surface integrity are achieved.

CN223083032UActive Publication Date: 2025-07-11CHANGSHA RENSHENG BUILDING MATERIALS TRADING CO LTD
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Patent Information

Application Number
CN202421603645.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-07-08
Publication Date
2025-07-11
Estimated Expiration
2034-07-08

AI Technical Summary

Technical Problem

When spraying existing hardware accessories, it is necessary to frequently adjust the angle and position of the tubular hardware accessories, which is cumbersome and easy to damage the sprayed paint surface.

Method used

A hardware accessories painting mechanism is designed, including an angle adjustment assembly and a nozzle position adjustment assembly. The angle is automatically maintained through ratchets and positioning torsion springs. The support assembly is used to support the hardware accessories to avoid direct contact. The electric slide rail is used to adjust the nozzle position.

Benefits of technology

It realizes convenient operation of the paint process of hardware accessories, avoids frequent adjustments in the spray angle and position, and ensures uniformity and integrity of the paint surface.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a paint spraying mechanism for hardware fittings, and relates to the technical field of hardware fitting processing. The supporting columns are fixedly installed at the bottoms of the supporting columns, and the supporting columns are used for supporting; the L-shaped plate is fixedly mounted on the operation table and is used for mounting the mechanism; the spray head is arranged on the L-shaped plate in a sliding manner, is used for spraying paint on the hardware fittings and is an existing mechanism; the supporting assembly is arranged on the angle adjusting assembly and used for supporting the hardware fitting, and the angle adjusting assembly can adjust the angle of the hardware fitting conveniently; the placing box is arranged on the operation table and used for placing the hardware fittings to be painted, centralized management of the hardware fittings is facilitated, through arrangement of the angle adjusting assembly and the supporting assembly, the hardware fittings can be supported and fixed, the painting angle of the hardware fittings is kept unchanged, and the hardware fittings can be conveniently and rapidly painted. And direct contact with the hardware fitting is not needed, paint on the hardware fitting cannot be wiped off, and operation is convenient.
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Description

Technical Field

[0001] The utility model relates to the technical field of hardware fitting processing, in particular to a painting mechanism for hardware fittings. Background Art

[0002] Hardware fittings refer to machine parts or components made of hardware, as well as some small hardware products. It can be used alone, or as an auxiliary tool and a supporting product, semi-finished product and tool used in the production process of industrial manufacturing, etc.

[0003] In order to slow down the corrosion of hardware fittings, a protective paint layer is usually sprayed on the surface of the hardware fittings. At present, when spraying tubular hardware fittings, the operator needs to adjust the spraying angle of the tubular hardware fittings so that the painting mechanism can evenly spray the surface of the tubular hardware fittings. During the operation, the fixation of the tubular hardware fittings needs to be released first, and then the spraying angle of the tubular hardware fittings is adjusted. After the adjustment is completed, it is fixed again. The operation is not only cumbersome, but also easily damages the sprayed paint surface. Therefore, a painting mechanism for hardware fittings is needed to meet the requirements. Content of the Utility Model

[0004] The purpose of the utility model is to provide a painting mechanism for hardware fittings to solve the problems put forward in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A painting mechanism for hardware fittings, including an operating table, which is square in shape;

[0006] Support columns, fixedly installed at the bottom of the support columns, with multiple groups, used for support;

[0007] L-shaped plates, fixedly installed on the operating table, used for the installation of the mechanism;

[0008] Spray nozzles, slidably arranged on the L-shaped plates, used for painting hardware fittings, which is an existing mechanism;

[0009] Spray nozzle position adjusting assembly, arranged on the operating table and the spray nozzles, used for adjusting the position of the spray nozzles and adjusting the spraying range;

[0010] Angle adjusting assembly, arranged on the operating table, used for adjusting the angle of the hardware fittings and evenly painting the hardware fittings;

[0011] Support assembly, arranged on the angle adjusting assembly, used for supporting the hardware fittings, facilitating the angle adjusting assembly to adjust the angle of the hardware fittings;

[0012] Placement box, arranged on the operating table, used for placing pre-painted hardware fittings, facilitating centralized management of the hardware fittings.

[0013] Further, the nozzle position adjustment assembly includes an electric slide rail fixedly installed on the L-shaped plate. An electric slider is slidably installed on the electric slide rail. An adapter plate is fixedly installed on the electric slider, and the nozzle is fixedly installed on the adapter plate.

[0014] Further, the angle adjustment assembly includes a support plate fixedly installed on the operating table. An angle adjustment shaft is rotatably installed on the support plate. A ratchet wheel is fixedly installed at the end of the angle adjustment shaft. One end of a positioning torsion spring is fixedly installed on the ratchet wheel, and the other end of the positioning torsion spring is fixedly installed on the support plate. A pawl is movably clamped on the ratchet wheel.

[0015] Further, the angle adjustment assembly further includes a rotating shaft rotatably installed on the support plate. The pawl and the end of the rotating shaft are fixedly connected. One end of a return torsion spring is fixedly installed on the rotating shaft, and the other end of the return torsion spring is fixedly installed on the support plate.

[0016] Further, a knob is fixedly installed on the ratchet wheel, and a contact strip is fixedly installed on the knob. The number of the contact strips is multiple, and the multiple contact strips are circumferentially distributed on the knob.

[0017] Further, the support assembly includes a mounting plate fixedly installed at the other end of the angle adjustment shaft. A sliding member is slidably installed on the mounting plate. A connecting block is fixedly installed at the end of the sliding member. An arc-shaped support plate is fixedly installed on the connecting block, and a friction pad is fixedly installed on the arc-shaped support plate.

[0018] Further, the support assembly further includes a gear rotatably installed on the mounting plate. One end of a rotating rod is fixedly installed on the gear, and the other end of the rotating rod is movably installed on the sliding member. An H-shaped tooth rack is slidably installed on the mounting plate. The H-shaped tooth rack meshes with the gear. A support block is fixedly installed on the mounting plate, and an adjusting screw rod is rotatably installed in the support block. The H-shaped tooth rack is threadedly sleeved on the adjusting screw rod.

[0019] Further, the support assembly further includes an annular hole opened on the sliding member. A round block is movably installed in the annular hole. The round block is fixedly installed at the other end of the rotating rod. A T-shaped guiding groove is opened on the mounting plate. A T-shaped guiding block is slidably installed in the T-shaped guiding groove. The T-shaped guiding block is fixedly installed at the bottom of the sliding member. A T-shaped guide rail is fixedly installed on the mounting plate. A T-shaped clamping groove is opened on the H-shaped tooth rack, and the T-shaped clamping groove is clamped on the T-shaped guide rail.

[0020] The beneficial effects of the present utility model are:

[0021] In the present utility model, through the arrangement of the angle adjustment component, when the knob is rotated counterclockwise, the rotation of the knob will drive the rotation of the angle adjustment shaft. The rotation of the angle adjustment shaft can drive the rotation of the support component, and the rotation of the support component can adjust the angle of the hardware fitting. On the other hand, when the ratchet rotates, the positioning torsion spring will also be twisted. The counterclockwise rotation of the ratchet will not be affected by the pawl. After the ratchet rotates, under the torque action of the positioning torsion spring, the ratchet will engage with the pawl, which can keep the painting angle of the hardware fitting unchanged, without directly contacting the hardware fitting, and will not wipe off the paint on the hardware fitting, and the operation is relatively convenient.

[0022] In the present utility model, through the arrangement of the support component, the two arc-shaped support plates are placed in the inner hole of the hardware fitting, and then the adjustment screw rod is rotated. The rotation of the adjustment screw rod can drive the rotation of the rotating rod. The rotation of the rotating rod will drive the round block to move within the sliding part, and the movement of the round block will push the sliding part to move on the mounting plate. The mutual separation of the two sliding parts can drive the mutual separation of the two connecting blocks. The mutual separation of the two connecting blocks can drive the mutual separation of the two arc-shaped support plates. The mutual separation of the two arc-shaped support plates will abut against the hole wall of the hardware fitting, which can play a role in supporting and fixing the hardware fitting. Description of the Drawings

[0023] Figure 1 is a three-dimensional structural schematic diagram of a hardware fitting painting mechanism proposed by the present utility model;

[0024] Figure 2 is a structural schematic diagram and a partial enlarged schematic diagram of the nozzle adjustment component of a hardware fitting painting mechanism proposed by the present utility model;

[0025] Figure 3 is a structural schematic diagram of an angle adjustment component of a hardware fitting painting mechanism proposed by the present utility model;

[0026] Figure 4 is a partial structural schematic diagram of a support component of a hardware fitting painting mechanism proposed by the present utility model;

[0027] Figure 5 is a structural schematic diagram of arc-shaped support plates, friction pads, etc. of a hardware fitting painting mechanism proposed by the present utility model.

[0028] In the figure: 1, operating table; 2, support column; 3, L-shaped plate; 4, spray head; 5, spray head position adjustment component; 51, electric slide rail; 52, electric slider; 53, connecting plate; 6, angle adjustment component; 61, support plate; 62, angle adjustment shaft; 63, ratchet wheel; 64, positioning torsion spring; 65, ratchet pawl; 66, rotating shaft; 67, reset torsion spring; 68, knob; 69, contact strip; 7, support component; 71, mounting plate; 72, sliding part; 73, connecting block; 74, arc support plate; 75, friction pad; 76, gear; 77, rotating rod; 78, H-shaped tooth rack; 79, support block; 710, adjusting screw rod; 711, annular hole; 712, round block; 713, T-shaped guide groove; 714, T-shaped guide block; 715, T-shaped guide rail; 8, placement box. Detailed implementation mode

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] Embodiment:

[0031] As Figures 1-5 shown, this embodiment provides a spraying mechanism for hardware accessories, including an operating table 1 with a square shape; support columns 2 fixedly installed at the bottom of the support columns 2, and there are multiple groups, used for support; an L-shaped plate 3 fixedly installed on the operating table 1, used for the installation of the mechanism; a spray head 4 slidably arranged on the L-shaped plate 3, used for spraying hardware accessories, which is an existing mechanism; a spray head position adjustment component 5 arranged on the operating table 1 and the spray head 4, used to adjust the position of the spray head 4 and adjust the spraying range; an angle adjustment component 6 arranged on the operating table 1, used to adjust the angle of the hardware accessories and spray the hardware accessories evenly; a support component 7 arranged on the angle adjustment component 6, used for supporting the hardware accessories to facilitate the angle adjustment component 6 to adjust the angle of the hardware accessories; a placement box 8 arranged on the operating table 1, used for placing pre-sprayed hardware accessories to facilitate centralized management of the hardware accessories;

[0032] During use, the hardware accessories to be sprayed are centrally placed in the placement box 8 for storage, which is convenient for the access of the hardware accessories. When the hardware accessories need to be sprayed, the hardware accessories are supported by the support component 7 and are adapted to hardware accessories with different pipe diameters. The spray head 4 can be driven to move back and forth by the spray head position adjustment component 5 to spray the upper half of the hardware accessories. The angle of the hardware accessories can be adjusted by the angle adjustment component 6 without directly contacting the hardware accessories, so that the paint on the hardware accessories will not be wiped off, and the angle of the hardware accessories can be adjusted to spray the lower half of the hardware accessories, and the operation is relatively convenient.

[0033] In one embodiment, further, the nozzle position adjustment assembly 5 includes an electric slide rail 51, the electric slide rail 51 is fixedly installed on the L-shaped plate 3, an electric slider 52 is slidably installed on the electric slide rail 51, a connecting plate 53 is fixedly installed on the electric slider 52, and the nozzle 4 is fixedly installed on the connecting plate 53;

[0034] The movement of the electric slider 52 on the electric slide rail 51 can drive the movement of the connecting plate 53, and the movement of the connecting plate 53 can adjust the position of the nozzle 4, changing the painting position of the nozzle 4.

[0035] In one embodiment, further, the angle adjustment assembly 6 includes a support plate 61, the support plate 61 is fixedly installed on the operating table 1, an angle adjustment shaft 62 is rotatably installed on the support plate 61, a ratchet wheel 63 is fixedly installed at the end of the angle adjustment shaft 62, one end of a positioning torsion spring 64 is fixedly installed on the ratchet wheel 63, the other end of the positioning torsion spring 64 is fixedly installed on the support plate 61, and a pawl 65 is movably clamped on the ratchet wheel 63;

[0036] When it is necessary to adjust the angle of the hardware fitting, the ratchet wheel 63 can be rotated counterclockwise. The rotation of the ratchet wheel 63 will drive the rotation of the angle adjustment shaft 62. The rotation of the angle adjustment shaft 62 can drive the rotation of the support assembly 7, and the rotation of the support assembly 7 can adjust the angle of the hardware fitting, so that the paint is evenly sprayed on the hardware fitting. On the other hand, the positioning torsion spring 64 will also be twisted when the ratchet wheel 63 rotates. The counterclockwise rotation of the ratchet wheel 63 will not be affected by the pawl 65. After the rotation of the ratchet wheel 63 is completed, there will be a tendency to drive the ratchet wheel 63 to rotate clockwise under the torque action of the positioning torsion spring 64, which will cause the ratchet wheel 63 to engage with the pawl 65. At this time, the painting angle of the hardware fitting can be kept unchanged.

[0037] In one embodiment, further, the angle adjustment assembly 6 further includes a rotating shaft 66, the rotating shaft 66 is rotatably installed on the support plate 61, the pawl 65 and the end of the rotating shaft 66 are fixedly connected, and one end of a return torsion spring 67 is fixedly installed on the rotating shaft 66, and the other end of the return torsion spring 67 is fixedly installed on the support plate 61;

[0038] During the counterclockwise rotation of the ratchet wheel 63, when a ratchet tooth on the ratchet wheel 63 separates from the pawl 65 after contact, the pawl 65 will rotate once. When a ratchet tooth just separates from the pawl 65, the return torsion spring 67 will drive the rotation of the rotating shaft 66, and the rotation of the rotating shaft 66 will drive the rotation of the pawl 65 to be clamped in the tooth gap, so that the pawl 65 is in close contact with the angle adjustment shaft 62.

[0039] In one embodiment, further, a knob 68 is fixedly installed on the ratchet wheel 63, a contact strip 69 is fixedly installed on the knob 68, the number of the contact strips 69 is multiple, and the multiple contact strips 69 are circumferentially distributed on the knob 68;

[0040] By setting the knob 68, the rotation of the ratchet 63 can be facilitated, and the contact strip 69 can increase the friction force when turning the knob 68.

[0041] In one embodiment, further, the support assembly 7 includes a mounting plate 71 which is fixedly installed at the other end of the angle adjustment shaft 62. A sliding member 72 is slidably installed on the mounting plate 71. A connecting block 73 is fixedly installed at the end of the sliding member 72. An arc-shaped support plate 74 is fixedly installed on the connecting block 73. A friction pad 75 is fixedly installed on the arc-shaped support plate 74.

[0042] When it is necessary to support the hardware fittings, the two arc-shaped support plates 74 can be placed in the inner holes of the hardware fittings. The two sliding members 72 moving away from each other can drive the two connecting blocks 73 to move away from each other. The two connecting blocks 73 moving away from each other can drive the two arc-shaped support plates 74 to move away from each other. The two arc-shaped support plates 74 moving away from each other will abut against the hole walls of the hardware fittings, which can play a role in supporting the hardware fittings.

[0043] In one embodiment, further, the support assembly 7 further includes a gear 76 which is rotatably installed on the mounting plate 71. One end of a rotating rod 77 is fixedly installed on the gear 76. The other end of the rotating rod 77 is movably installed on the sliding member 72. An H-shaped tooth rack 78 is slidably installed on the mounting plate 71. The H-shaped tooth rack 78 meshes with the gear 76. A support block 79 is fixedly installed on the mounting plate 71. An adjusting screw rod 710 is rotatably installed in the support block 79. The H-shaped tooth rack 78 is threadedly sleeved on the adjusting screw rod 710.

[0044] Rotating the adjusting screw rod 710 can drive the H-shaped tooth rack 78 to move forward. The H-shaped tooth rack 78 moving forward will drive the gear 76 to rotate. The gear 76 rotating will drive the rotating rod 77 to rotate. The two rotating rods 77 rotating will drive the two sliding members 72 to move away from each other, thereby playing a role in supporting and fixing the hardware fittings.

[0045] In one embodiment, further, the support assembly 7 further includes an annular hole 711 which is opened on the sliding member 72. A round block 712 is movably installed in the annular hole 711. The other end of the rotating rod 77 is fixedly installed on the round block 712. A T-shaped guide groove 713 is opened on the mounting plate 71. A T-shaped guide block 714 is slidably installed in the T-shaped guide groove 713. The T-shaped guide block 714 is fixedly installed at the bottom of the sliding member 72. A T-shaped guide rail 715 is fixedly installed on the mounting plate 71. A T-shaped card slot 716 is opened on the H-shaped tooth rack 78. The T-shaped card slot 716 is clamped on the T-shaped guide rail 715.

[0046] The rotation of the rotating rod 77 drives the circular block 712 to move within the sliding member 72. The movement of the circular block 712 pushes the sliding member 72 to move on the mounting plate 71. The sliding of the T-shaped guide block 714 within the T-shaped guide groove 713 can position the movement of the sliding member 72, enabling the sliding member 72 to only move left and right on the mounting plate 71. The T-shaped card slot 716 is snap-fitted onto the T-shaped guide rail 715, which can guide the movement of the H-shaped tooth rack 78.

[0047] Working principle: During use, the hardware fittings to be spray-painted are centrally placed in the placement box 8 for storage, facilitating the access to the hardware fittings. When it is necessary to spray-paint the hardware fittings, the two arc-shaped support plates 74 are placed in the inner holes of the hardware fittings, and then the adjusting screw rod 710 is rotated. The rotation of the adjusting screw rod 710 drives the H-shaped tooth rack 78 to move forward. The forward movement of the H-shaped tooth rack 78 drives the gear 76 to rotate. The rotation of the gear 76 drives the rotating rod 77 to rotate. The rotation of the rotating rod 77 drives the circular block 712 to move within the sliding member 72. The movement of the circular block 712 pushes the sliding member 72 to move on the mounting plate 71. The mutual separation of the two sliding members 72 drives the mutual separation of the two connecting blocks 73. The mutual separation of the two connecting blocks 73 drives the mutual separation of the two arc-shaped support plates 74. The mutual separation of the two arc-shaped support plates 74 abuts against the inner wall of the hole of the hardware fitting, which can support and fix the hardware fitting. The hardware fitting can be spray-painted through the spray head 4. The movement of the electric slider 52 on the electric slide rail 51 drives the connecting plate 53 to move, and the movement of the connecting plate 53 can adjust the spraying position of the spray head 4. When the upper part of the hardware fitting is sprayed, then the knob 68 is rotated counterclockwise. The rotation of the knob 68 drives the ratchet wheel 63 to rotate. The rotation of the ratchet wheel 63 drives the angle adjustment shaft 62 to rotate. The rotation of the angle adjustment shaft 62 can drive the support assembly 7 to rotate, and the rotation of the support assembly 7 can adjust the angle of the hardware fitting. On the other hand, when the ratchet wheel 63 rotates, the positioning torsion spring 64 is also twisted. The counterclockwise rotation of the ratchet wheel 63 is not affected by the pawl 65. After the rotation of the ratchet wheel 63 is completed, under the torque action of the positioning torsion spring 64, there is a tendency to drive the ratchet wheel 63 to rotate clockwise, which will cause the ratchet wheel 63 to engage with the pawl 65. At this time, the spraying angle of the hardware fitting can be kept unchanged, enabling the paint to be evenly sprayed on the hardware fitting, without the need to directly contact the hardware fitting, and not wiping off the paint on the hardware fitting. The operation is relatively convenient. It should be noted that the spray head 4 is an existing mechanism, and the specific principle will not be elaborated. All the electrical equipment of the present utility model is connected to an external power supply. During use, considering the movement of the mechanism, the wire harness is sorted out, and no problem of wire harness entanglement will be caused.

[0048] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, making equivalent substitutions or changes, shall be covered by the protection scope of the present utility model.

Claims

1. A painting mechanism for hardware fittings, comprising, characterized in that: An operating table (1), shaped like a square; Support columns (2), fixedly installed at the bottom of the support columns (2), with multiple groups in number, for support; An L-shaped plate (3), fixedly installed on the operating table (1), for the installation of the mechanism; A spray head (4), slidably arranged on the L-shaped plate (3), for painting the hardware fittings, which is an existing mechanism; A spray head position adjustment component (5), arranged on the operating table (1) and the spray head (4), for adjusting the position of the spray head (4) and adjusting the painting range; An angle adjustment component (6), arranged on the operating table (1), for adjusting the angle of the hardware fittings to paint the hardware fittings evenly; A support component (7), arranged on the angle adjustment component (6), for supporting the hardware fittings to facilitate the angle adjustment component (6) to adjust the angle of the hardware fittings; A placement box (8), arranged on the operating table (1), for placing the pre-painted hardware fittings to facilitate the centralized management of the hardware fittings.

2. The paint spraying mechanism for a hardware fitting according to claim 1, characterized in that: The spray head position adjustment component (5) includes an electric slide rail (51), the electric slide rail (51) is fixedly installed on the L-shaped plate (3), an electric slider (52) is slidably installed on the electric slide rail (51), a connecting plate (53) is fixedly installed on the electric slider (52), and the spray head (4) is fixedly installed on the connecting plate (53).

3. A hardware fitting painting mechanism according to claim 1, characterized in that: The angle adjustment component (6) includes a support plate (61), the support plate (61) is fixedly installed on the operating table (1), an angle adjustment shaft (62) is rotatably installed on the support plate (61), a ratchet wheel (63) is fixedly installed at the end of the angle adjustment shaft (62), one end of a positioning torsion spring (64) is fixedly installed on the ratchet wheel (63), the other end of the positioning torsion spring (64) is fixedly installed on the support plate (61), and a pawl (65) is movably clamped on the ratchet wheel (63).

4. A hardware fitting painting mechanism according to claim 3, characterized in that: The angle adjustment component (6) further includes a rotating shaft (66), the rotating shaft (66) is rotatably installed on the support plate (61), the pawl (65) and the end of the rotating shaft (66) are fixedly connected, one end of a return torsion spring (67) is fixedly installed on the rotating shaft (66), and the other end of the return torsion spring (67) is fixedly installed on the support plate (61).

5. A spray painting mechanism for hardware fittings according to claim 4, characterized in that: A knob (68) is fixedly installed on the ratchet wheel (63), a contact strip (69) is fixedly installed on the knob (68), the number of the contact strips (69) is multiple, and the multiple contact strips (69) are circumferentially distributed on the knob (68).

6. A hardware fitting painting mechanism according to claim 1, characterized in that: The support component (7) includes a mounting plate (71), the mounting plate (71) is fixedly installed at the other end of the angle adjustment shaft (62), a sliding member (72) is slidably installed on the mounting plate (71), a connecting block (73) is fixedly installed at the end of the sliding member (72), an arc-shaped support plate (74) is fixedly installed on the connecting block (73), and a friction pad (75) is fixedly installed on the arc-shaped support plate (74).

7. A hardware fitting spraying mechanism according to claim 6, characterized in that: The support assembly (7) further includes a gear (76). The gear (76) is rotatably mounted on the mounting plate (71). One end of a rotating rod (77) is fixedly mounted on the gear (76), and the other end of the rotating rod (77) is movably mounted on the sliding member (72). An H-shaped tooth rack (78) is slidably mounted on the mounting plate (71). The H-shaped tooth rack (78) meshes with the gear (76). A support block (79) is fixedly mounted on the mounting plate (71). An adjusting screw rod (710) is rotatably mounted in the support block (79). The H-shaped tooth rack (78) is threadedly sleeved on the adjusting screw rod (710).

8. A hardware fitting painting mechanism according to claim 7, characterized in that: The support assembly (7) further includes an annular hole (711). The annular hole (711) is formed in the sliding member (72). A round block (712) is movably mounted in the annular hole (711). The round block (712) is fixedly mounted on the other end of the rotating rod (77). A T-shaped guiding groove (713) is formed in the mounting plate (71). A T-shaped guiding block (714) is slidably mounted in the T-shaped guiding groove (713). The T-shaped guiding block (714) is fixedly mounted on the bottom of the sliding member (72). A T-shaped guide rail (715) is fixedly mounted on the mounting plate (71). A T-shaped clamping groove (716) is formed in the H-shaped tooth rack (78). The T-shaped clamping groove (716) is clamped on the T-shaped guide rail (715).