Circuit board surface coating device

Abstract

The invention discloses a circuit board surface coating device which solves the problem that it is inconvenient to change the position of a nozzle and the spraying range according to the length of a circuit board, the circuit board surface coating device comprises a workbench, a spraying treatment assembly is arranged above the workbench, the spraying treatment assembly comprises a transverse plate arranged above the workbench, and lifting air cylinders are symmetrically installed at the top end of the transverse plate; a mounting frame is mounted at the output end of the lifting air cylinder, a length adjusting unit is mounted at the bottom end of the mounting frame, a moving driving part is mounted at the top end of the transverse plate, the length adjusting unit comprises spray head boxes arranged below the mounting frame at equal intervals, nozzles are mounted at the bottom ends of the spray head boxes, and an equal-distance moving part is mounted between every two adjacent spray head boxes. A moving block is fixedly mounted at the top end of the spray head box and is slidably mounted in the moving groove; according to the device, all the arranged connecting plates move synchronously, all the spray head boxes are driven to move through the connecting rods, all the spray head boxes are still evenly arranged after moving, and therefore the circuit board coating effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit board processing, and in particular relates to a circuit board surface coating device. Background Art

[0002] In the production process of circuit boards, it is generally necessary to coat the surface of the circuit board with a layer of new materials, such as conformal coating, UV glue, etc., to achieve waterproof, dustproof, anti-static and other effects, thereby significantly improving the reliability and service life of the product. When the circuit board is fixed on a fixed table, nozzles are arranged equidistantly above the fixed table, and multiple nozzles spray paint and other materials downward onto the surface of the circuit board, thereby spraying and coating the circuit board. However, there are the following defects:

[0003] Due to the different types of circuit boards, the lengths of the circuit boards are different. Since the nozzles are arranged at equal distances and are not easy to adjust, the spraying range is fixed, which makes it inconvenient to change the nozzle position and the spraying range according to the length of the circuit board. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a circuit board surface coating device, which effectively solves the problem of inconvenience in changing the nozzle position and the spraying range according to the length of the circuit board.

[0005] To achieve the above object, the present invention provides the following technical solution: a circuit board surface coating device, comprising a workbench, above which a spraying treatment component is provided;

[0006] The spraying treatment assembly includes a horizontal plate arranged above the workbench, a lifting cylinder is symmetrically installed on the top of the horizontal plate, a mounting frame is installed on the output end of the lifting cylinder, a length adjustment unit is installed at the bottom end of the mounting frame, and a moving driving member is installed on the top of the horizontal plate;

[0007] The length adjustment unit includes a nozzle box equidistantly arranged below the mounting frame, a nozzle installed at the bottom end of the nozzle box, an equidistant moving part installed between two adjacent nozzle boxes, a moving block fixedly installed at the top of the nozzle box, the moving block is slidably installed inside the moving groove, the moving groove is opened inside the mounting frame, length control units are installed on the moving blocks at both ends, and a feed control unit is installed on the outside of the nozzle box.

[0008] Preferably, the equidistant moving part includes a connecting plate arranged between two adjacent nozzle boxes, a connecting rod is symmetrically hingedly installed on the side of the connecting plate close to the nozzle box, the other ends of the two connecting rods are respectively hingedly installed to the two nozzle boxes, a guide ring is fixedly installed on the side of the connecting plate away from the nozzle box, and transverse rods are inserted into the interior of the multiple guide rings. When the transverse rod moves toward the side away from the nozzle box, the nozzle boxes are driven to be equidistantly close together through the connecting rod.

[0009] Preferably, a plug sleeve is installed on the side of the transverse rod away from the nozzle box, an insert rod is longitudinally inserted into the interior of the plug sleeve, and a fine-tuning control component is installed on the insert rod.

[0010] Preferably, the fine-tuning control component includes a top slide fixedly mounted on the top of the mounting frame, a sliding seat is slidably mounted inside the top slide, a top block is mounted on the top of the sliding seat, a connecting rod is installed between the top block and the top of the insertion rod, a moving screw is rotatably mounted inside the top slide, the moving screw is threadedly connected to the sliding seat, one end of the moving screw is fixedly connected to the output shaft of the driving motor, and the driving motor is fixedly mounted on the top slide.

[0011] Preferably, the length control unit includes rod grooves symmetrically opened at both ends of the moving groove, and moving rods are installed on the sides of the two moving blocks at both ends that are away from each other. The moving rods pass through the rod grooves, and side plates are fixedly installed on the ends of the moving rods. Roller frames are fixedly installed on the bottom ends of the side plates, and limiting rollers are installed on the sides of the two roller frames that are close to each other.

[0012] Preferably, the feed control unit includes a connecting box arranged on the side of the nozzle box away from the connecting plate, the connecting box corresponds to the nozzle box one by one, a serpentine tube is installed at the bottom end of the connecting box, the other end of the serpentine tube is connected to the nozzle box, a connecting box is provided above the connecting box, branch pipes are equidistantly installed at the bottom end of the connecting box, each branch pipe is fixedly connected to the top of each connecting box, a material box is symmetrically installed at the top of the mounting frame, a hose is installed on the material box, and the other end of the hose is connected and installed with a fixed pipe.

[0013] Preferably, two sliding sleeves are installed on the top of the mounting frame, and the two sliding sleeves are symmetrically arranged on both sides of the top block. A sliding plate is fixedly installed on the top of the fixed tube, and the two sliding plates are respectively slidably installed inside the two sliding sleeves. Side grooves are opened on the sides of the two sliding sleeves close to each other, and side rods are symmetrically installed on both sides of the top block. The two side rods pass through the two side grooves and are fixedly connected to the two sliding plates.

[0014] Preferably, the mobile driving member includes a sliding block fixedly mounted on the top of the horizontal plate, the sliding block is slidably mounted inside the sliding frame, a rotating screw is rotatably mounted inside the sliding frame, the rotating screw is threadedly connected to the sliding block, one end of the rotating screw is fixedly connected to the output shaft of the stepper motor, and the stepper motor is fixedly mounted on the sliding frame.

[0015] Preferably, the sliding frame is fixedly installed at the bottom end of the top plate, the top plate is arranged above the workbench, four supporting columns are installed between the workbench and the top plate, a placement table for installing the circuit board is installed on the top of the workbench, two negative pressure holes are symmetrically opened on the placement table, and a negative pressure device is installed inside the workbench, and the negative pressure device generates negative pressure on the circuit board through the negative pressure hole to fix the circuit board.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) During operation, the moving blocks at both ends are provided with moving rods on the side away from each other. When each nozzle box moves, the two side plates can be driven to move relative to each other. When the limiting rollers on the two roller frames contact the side walls at both ends of the circuit board respectively, the position of the nozzle box is adjusted, which is convenient for coating circuit boards of different lengths. When the mobile spraying is performed, a guiding effect is formed to improve the coating stability.

[0018] 2) During operation, the moving block at the top of the nozzle box is slidably installed inside the moving groove. When the insertion rod moves, the transverse rod is pulled to move, and then each connecting plate is driven to move, thereby driving each nozzle box to move through the connecting rod, and each nozzle box is still evenly arranged after moving, thereby improving the coating effect of the circuit board;

[0019] 3) During operation, the connecting box and the nozzle box are connected by a serpentine pipe, which facilitates the movement of the nozzle box for position adjustment. When the distance between adjacent nozzle boxes is shortened, the fixed pipe is synchronously driven by the top block to move toward one side of the mounting frame, thereby reducing the deformation of the serpentine pipe, protecting the serpentine pipe, and improving the spray circulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0021] In the attached picture:

[0022] Figure 1 It is a schematic structural diagram of a circuit board surface coating device of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the spraying treatment component of the present invention;

[0024] Figure 3 It is a schematic diagram of the front structure of the mounting frame of the present invention;

[0025] Figure 4 It is a schematic diagram of the back structure of the mounting frame of the present invention;

[0026] Figure 5 It is a schematic diagram of the length adjustment unit structure of the present invention;

[0027] Figure 6 It is a schematic diagram of the connection structure between the sliding sleeve and the sliding plate of the present invention.

[0028] In the figure: 1, workbench; 2, top plate; 3, support column; 4, placement table; 5, negative pressure hole; 6, spray treatment assembly; 601, sliding frame; 602, horizontal plate; 603, sliding block; 604, lifting cylinder; 605, mounting frame; 606, rotating screw; 607, stepping motor; 608, length adjustment unit; 6081, nozzle box; 6082, nozzle; 6083, moving groove; 6084, moving block; 6085, connecting plate; 6086, connecting rod; 6087, guide ring; 6088, horizontal rod; 6089, plug sleeve; 60810, plug rod; 6081 1. Top slide; 60812. Sliding seat; 60813. Top block; 60814. Connecting rod; 60815. Moving screw; 60816. Driving motor; 609. Length control unit; 6091. Rod slot; 6092. Moving rod; 6093. Side plate; 6094. Roller rack; 6095. Limit roller; 610. Feed control unit; 6101. Fixed pipe; 6102. Connecting box; 6103. Serpentine pipe; 6104. Material box; 6105. Hose; 6106. Sliding sleeve; 6107. Sliding plate; 6108. Side slot; 6109. Side rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Depend on Figure 1-6 The present invention relates to a circuit board surface coating device, comprising a workbench 1, a spraying treatment component 6 is arranged above the workbench 1, the spraying treatment component 6 comprises a horizontal plate 602 arranged above the workbench 1, a lifting cylinder 604 is symmetrically installed on the top of the horizontal plate 602, a mounting frame 605 is installed on the output end of the lifting cylinder 604, a length adjustment unit 608 is installed on the bottom end of the mounting frame 605, a moving drive component is installed on the top of the horizontal plate 602, the moving drive component comprises a sliding block 603 fixedly installed on the top of the horizontal plate 602, the sliding block 603 is slidably installed inside the sliding frame 601, a rotating screw 606 is rotatably installed inside the sliding frame 601, the rotating screw 606 is threadedly connected to the sliding block 603, one end of the rotating screw 606 is fixedly connected to the output shaft of a stepping motor 607, and the stepping motor 607 is fixedly installed on the sliding frame 601.

[0031] The length adjustment unit 608 includes a nozzle box 6081 equidistantly arranged below the mounting frame 605, a nozzle 6082 is installed at the bottom of the nozzle box 6081, an equidistant moving part is installed between two adjacent nozzle boxes 6081, a moving block 6084 is fixedly installed at the top of the nozzle box 6081, and the moving block 6084 is slidably installed inside the moving groove 6083, and the moving groove 6083 is opened inside the mounting frame 605. Length control units 609 are installed on the moving blocks 6084 at both ends, and a feed control unit 610 is installed on the outer side of the nozzle box 6081. The equidistant moving parts include those arranged between two adjacent nozzle boxes. A connecting plate 6085 is provided between the nozzle boxes 6081. A connecting rod 6086 is symmetrically hingedly installed on one side of the connecting plate 6085 close to the nozzle box 6081. The other ends of the two connecting rods 6086 are hingedly installed with the two nozzle boxes 6081 respectively. A guide ring 6087 is fixedly installed on the side of the connecting plate 6085 away from the nozzle box 6081. Transverse rods 6088 are inserted into the guide rings 6087. When the transverse rods 6088 move toward the side away from the nozzle box 6081, the nozzle boxes 6081 are driven to be equidistantly close to each other through the connecting rods 6086. The transverse rods 6088 are away from the nozzle box 6081. A sleeve 6089 is installed on one side of the sleeve 6089, a rod 60810 is longitudinally inserted into the sleeve 6089, a fine-tuning control part is installed on the rod 60810, and the fine-tuning control part includes a top slide 60811 fixedly installed on the top of the mounting frame 605, a sliding seat 60812 is slidably installed inside the top slide 60811, a top block 60813 is installed on the top of the sliding seat 60812, a connecting rod 60814 is installed between the top block 60813 and the top of the rod 60810, a moving screw 60815 is rotatably installed inside the top slide 60811, and the moving screw 6081 5 is threadedly connected to the sliding seat 60812, one end of the moving screw 60815 is fixedly connected to the output shaft of the driving motor 60816, the driving motor 60816 is fixedly installed on the top sliding frame 60811, and the moving block 6084 at the top of the nozzle box 6081 is slidably installed in the moving groove 6083. When the insertion rod 60810 moves, the horizontal rod 6088 is pulled to move, and then the connecting plates 6085 are driven to move, thereby driving the nozzle boxes 6081 to move through the connecting rod 6086, and the nozzle boxes 6081 are still evenly arranged after moving, thereby improving the coating effect of the circuit board.

[0032] The length control unit 609 includes a rod groove 6091 symmetrically opened at both ends of the moving groove 6083, and a moving rod 6092 is installed on the side away from each other of the two moving blocks 6084 at both ends. The moving rod 6092 passes through the rod groove 6091, and a side plate 6093 is fixedly installed on the end of the moving rod 6092. A roller frame 6094 is fixedly installed on the bottom end of the side plate 6093. A limiting roller 6095 is installed on the side where the two roller frames 6094 are close to each other. The moving rod 6092 is installed on the side away from each other of the moving blocks 6084 at both ends. When each nozzle box 6081 moves, it can drive the two side plates 6093 to move relative to each other. When the two roller frames 609 When the limiting rollers 6095 on 4 contact the side walls of both ends of the circuit board respectively, the position of the nozzle box 6081 is adjusted to facilitate coating of circuit boards of different lengths, and a guiding effect is formed during mobile spraying to improve coating stability. The connecting box 6102 is connected to the nozzle box 6081 through a serpentine tube 6103, so as to facilitate the movement of the nozzle box 6081 for position adjustment. When the distance between adjacent nozzle boxes 6081 is shortened, the fixed tube 6101 is synchronously driven by the top block 60813 to move toward one side of the mounting frame 605, thereby reducing the deformation of the serpentine tube 6103, protecting the serpentine tube 6103, and improving the flow effect of the spray material.

[0033] The feed control unit 610 includes a connecting box 6102 arranged on the side of the nozzle box 6081 away from the connecting plate 6085, the connecting box 6102 corresponds to the nozzle box 6081 one by one, a serpentine tube 6103 is installed at the bottom end of the connecting box 6102, and the other end of the serpentine tube 6103 is connected to the nozzle box 6081. A connecting box 6102 is arranged above the connecting box 6102, and branch pipes are equidistantly installed at the bottom end of the connecting box 6102, and each branch pipe is fixedly connected to the top of each connecting box 6102. A material box 6104 is symmetrically installed at the top of the mounting frame 605, and a hose 6105 is installed on the material box 6104. The other end of the hose 6105 is connected to the fixed pipe 6101 and installed. Two sliding sleeves 6106 are installed on the top of the mounting frame 605. The two sliding sleeves 6106 are symmetrically arranged on both sides of the top block 60813. A sliding plate 6107 is fixedly installed on the top of the fixed pipe 6101. The two sliding plates 6107 are respectively slidably installed inside the two sliding sleeves 6106. Side grooves 6108 are provided on the sides of the two sliding sleeves 6106 that are close to each other. Side rods 6109 are symmetrically installed on both sides of the top block 60813. The two side rods 6109 respectively pass through the two side grooves 6108 and are fixedly connected to the two sliding plates 6107.

[0034] The sliding frame 601 is fixedly installed on the bottom end of the top plate 2, and the top plate 2 is arranged above the workbench 1. Four supporting columns 3 are installed between the workbench 1 and the top plate 2. A placement table 4 for installing a circuit board is installed on the top of the workbench 1. Two negative pressure holes 5 are symmetrically opened on the placement table 4. A negative pressure device is installed inside the workbench 1. The negative pressure device generates negative pressure on the circuit board through the negative pressure hole 5 to fix the circuit board.

[0035] Working principle: When working, first place the circuit board to be coated on the top of the placement table 4, turn on the negative pressure device inside the workbench 1, so that negative pressure suction is generated between the negative pressure hole 5 and the bottom wall of the circuit board, thereby fixing the circuit board;

[0036] Then, the two lifting cylinders 604 are turned on to move the mounting frame 605 downward until the two limit rollers 6095 are respectively located at the two ends of the circuit board. Then, the driving motor 60816 is turned on to rotate the moving screw 60815. Since the moving screw 60815 is threadedly connected to the sliding seat 60812, the insertion rod 60810 is driven to move. Since the insertion rod 60810 is inserted into the insertion sleeve 6089, the transverse rod 6088 is pulled to move. The transverse rod 6088 is located inside the guide ring 6087 on each connecting plate 6085, so that Pull each connection plate 6085 to move simultaneously, thereby pulling the two nozzle boxes 6081 closer to each other through the connecting rod 6086. When the nozzle boxes 6081 at both ends move closer to each other, the two side plates 6093 are driven to move closer to each other until the limiting rollers 6095 on the two roller frames 6094 contact the two ends of the circuit board respectively. Since the connection plate 6085 is connected to the two adjacent nozzle boxes 6081 through the two connecting rods 6086, after each nozzle box 6081 moves, each nozzle box 6081 is still equidistantly arranged, thereby improving the uniformity of spray coating;

[0037] When the transverse rod 6088 moves toward the side away from the nozzle box 6081, each nozzle box 6081 is displaced to a certain extent. Since the connecting box 6102 and the nozzle box 6081 are connected by the serpentine tube 6103, when the nozzle box 6081 moves, the serpentine tube 6103 is deformed. Since the top block 60813 and the sliding plate 6107 are fixedly connected by the side rod 6109, the fixed tube 6101 is driven to move toward the side of the mounting frame 605, thereby reducing the deformation of the serpentine tube 6103, on the one hand, extending the service life of the serpentine tube 6103, and on the other hand, improving the spraying and feeding effect;

[0038] Then, the pump body in the material box 6104 is opened, so that the spray material enters the fixed pipe 6101 from the material box 6104 through the hose 6105, and then enters the connecting box 6102, and then enters each nozzle box 6081 from the branch pipe and the serpentine pipe 6103, and finally sprays downward from each nozzle 6082 to the surface of the circuit board for spray coating. At the same time, the stepper motor 607 is turned on to drive the rotating screw 606 to rotate, thereby driving the sliding block 603 to move along the sliding frame 601, so as to spray and coat the upper surface of the circuit board.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A circuit board surface coating device, comprising a workbench (1), characterized in that: A spraying treatment component (6) is provided above the workbench (1); The spraying treatment assembly (6) comprises a horizontal plate (602) arranged above the workbench (1), a lifting cylinder (604) is symmetrically installed on the top of the horizontal plate (602), a mounting frame (605) is installed on the output end of the lifting cylinder (604), a length adjustment unit (608) is installed at the bottom end of the mounting frame (605), and a moving drive member is installed at the top of the horizontal plate (602); The length adjustment unit (608) comprises a nozzle box (6081) equidistantly arranged below the mounting frame (605), a nozzle (6082) being installed at the bottom end of the nozzle box (6081), an equidistant moving part being installed between two adjacent nozzle boxes (6081), a moving block (6084) being fixedly installed at the top end of the nozzle box (6081), the moving block (6084) being slidably installed inside a moving groove (6083), the moving groove (6083) being opened inside the mounting frame (605), a length control unit (609) being installed on the moving blocks (6084) at both ends, and a feed control unit (610) being installed on the outer side of the nozzle box (6081).

2. A circuit board surface coating device according to claim 1, characterized in that: The equidistant moving member comprises a connecting plate (6085) arranged between two adjacent nozzle boxes (6081); a connecting rod (6086) is symmetrically hingedly installed on one side of the connecting plate (6085) close to the nozzle box (6081); the other ends of the two connecting rods (6086) are hingedly installed with the two nozzle boxes (6081) respectively; a guide ring (6087) is fixedly installed on the side of the connecting plate (6085) away from the nozzle box (6081); a plurality of transverse rods (6088) are inserted into the inside of the guide rings (6087); when the transverse rod (6088) moves toward the side away from the nozzle box (6081), the connecting rod (6086) drives each nozzle box (6081) to be equidistantly close.

3. A circuit board surface coating device according to claim 2, characterized in that: A plug sleeve (6089) is installed on the side of the transverse rod (6088) away from the nozzle box (6081), and an insertion rod (60810) is longitudinally inserted into the interior of the plug sleeve (6089), and a fine-tuning control component is installed on the insertion rod (60810).

4. A circuit board surface coating device according to claim 3, characterized in that: The fine-tuning control component includes a top slide (60811) fixedly mounted on the top of the mounting frame (605); a sliding seat (60812) is slidably mounted inside the top slide (60811); a top block (60813) is mounted on the top of the sliding seat (60812); a connecting rod (60814) is mounted between the top block (60813) and the top of the insertion rod (60810); a moving screw (60815) is rotatably mounted inside the top slide (60811); the moving screw (60815) is threadedly connected to the sliding seat (60812); one end of the moving screw (60815) is fixedly connected to the output shaft of a driving motor (60816); and the driving motor (60816) is fixedly mounted on the top slide (60811).

5. A circuit board surface coating device according to claim 1, characterized in that: The length control unit (609) comprises rod grooves (6091) symmetrically arranged at both ends of the moving groove (6083); a moving rod (6092) is installed on the side of the two moving blocks (6084) at both ends that are away from each other; the moving rod (6092) passes through the rod groove (6091); a side plate (6093) is fixedly installed on the end of the moving rod (6092); a roller frame (6094) is fixedly installed on the bottom end of the side plate (6093); and a limiting roller (6095) is installed on the side of the two roller frames (6094) that are close to each other.

6. A circuit board surface coating device according to claim 1, characterized in that: The feed control unit (610) includes a connecting box (6102) arranged on a side of the nozzle box (6081) away from the connecting plate (6085), the connecting box (6102) corresponds to the nozzle box (6081) one by one, a serpentine tube (6103) is installed at the bottom end of the connecting box (6102), and the other end of the serpentine tube (6103) is connected to the nozzle box (6081), a connecting box (6102) is provided above the connecting box (6102), and branch pipes are equidistantly installed at the bottom end of the connecting box (6102), and each branch pipe is fixedly connected to the top of each connecting box (6102), and a material box (6104) is symmetrically installed at the top of the mounting frame (605), and a hose (6105) is installed on the material box (6104), and the other end of the hose (6105) is connected and installed with the fixed pipe (6101).

7. A circuit board surface coating device according to claim 6, characterized in that: Two sliding sleeves (6106) are installed on the top of the mounting frame (605), and the two sliding sleeves (6106) are symmetrically arranged on both sides of the top block (60813). A sliding plate (6107) is fixedly installed on the top of the fixed tube (6101), and the two sliding plates (6107) are respectively slidably installed inside the two sliding sleeves (6106). Side grooves (6108) are opened on the sides of the two sliding sleeves (6106) close to each other. Side rods (6109) are symmetrically installed on both sides of the top block (60813), and the two side rods (6109) pass through the two side grooves (6108) and are fixedly connected to the two sliding plates (6107).

8. A circuit board surface coating device according to claim 1, characterized in that: The mobile driving member comprises a sliding block (603) fixedly mounted on the top of the horizontal plate (602); the sliding block (603) is slidably mounted inside the sliding frame (601); a rotating screw (606) is rotatably mounted inside the sliding frame (601); the rotating screw (606) is threadedly connected to the sliding block (603); one end of the rotating screw (606) is fixedly connected to the output shaft of a stepping motor (607); and the stepping motor (607) is fixedly mounted on the sliding frame (601).

9. A circuit board surface coating device according to claim 8, characterized in that: The sliding frame (601) is fixedly installed on the bottom end of the top plate (2), and the top plate (2) is arranged above the workbench (1). Four supporting columns (3) are installed between the workbench (1) and the top plate (2). A placement table (4) for installing a circuit board is installed on the top of the workbench (1). Two negative pressure holes (5) are symmetrically opened on the placement table (4). A negative pressure device is installed inside the workbench (1). The negative pressure device generates negative pressure on the circuit board through the negative pressure hole (5) to fix the circuit board.

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