CN108819501B - A PCB board fixture - Google Patents

Abstract

The invention discloses a PCB (printed circuit board) clamp, which comprises a table top with a rectangular structure, wherein a fixed clamp is respectively arranged on a first long side and a first short side which are adjacent to each other of the table top, and a plurality of movable clamps are respectively arranged in the middle area of the table top; the movable clamp can change positions along the direction perpendicular to the first long side or the first short side of the table top respectively; the PCB board is placed on the mesa, and the PCB board four sides are compressed tightly fixedly by mounting fixture, movable fixture respectively. The PCB clamp provided by the invention has the advantages that: the PCB with various sizes can be conveniently fixed on the table top through the matching of the fixed clamp and the movable clamp, four sides of the PCB can be simultaneously fixed, and the problem of tilting of the PCB during ink spraying is effectively solved; the movable plate is controlled by the pulling plate to realize that the fixed clamp is lifted simultaneously, so that the movable plate is convenient to control and has good popularization prospect.

Description

A PCB board fixture

Technical Field

The invention relates to the technical field of PCB production, and in particular to a PCB board clamp.

Background technique

When inkjet printing on a PCB, in order to obtain an accurate image, the nozzle must be close enough to the PCB. Once the PCB is warped, the nozzle may be damaged. Therefore, the PCB needs to be pressed and fixed all around. The general method is to use a clamp to press it, but traditional clamps can only adapt to PCBs of a specific size and are not very convenient to use.

Summary of the invention

The technical problem to be solved by the present invention is to provide a PCB board clamp that can be suitable for different sizes.

The present invention solves the above technical problems through the following technical solutions:

A PCB clamp comprises a rectangular table top, wherein the adjacent first long side and first short side of the table top are respectively provided with fixed clamps, and a plurality of movable clamps are respectively provided in the middle area of the table top; the movable clamps can change positions along the direction perpendicular to the first long side or the first short side of the table top; a PCB board is placed on the table top, and the four sides of the PCB board are respectively pressed and fixed by the fixed clamps and the movable clamps.

Preferably, a first sliding groove perpendicular to the first long side and a second sliding groove perpendicular to the first short side are arranged on the table top, and a movable clamp is arranged in each of the first sliding groove and the second sliding groove respectively.

Preferably, multiple first slide grooves are arranged along the second long side, and the second slide grooves are arranged along the second short side in an area close to the first long side. The first slide groove close to the second short side extends from the second long side to the second slide groove closest to the second long side; the lengths of the first slide groove close to the first short side and the second slide groove close to the first long side gradually become longer, and the first slide groove and the second slide groove form a step-type layout.

Preferably, the first long side and the first short side are respectively provided with a plurality of clamp grooves evenly arranged along the length direction, the fixing clamp comprises a fixing key cooperating with the clamp groove, the upper surface of the fixing key extends at least toward one side of the table working area to form a fixed pressure plate, and the fixing key can move up and down along the clamp groove to change its position.

Preferably, a movable plate is respectively arranged below the first long side and the first short side of the table top, the movable plate is fixedly matched with a fixing fixture, and the movable plate is movably matched with the table top along a vertical direction.

Preferably, a pull plate is further provided under the table top, and the pull plate is movably matched with the table top in the horizontal direction, and is movably matched with the movable plate in the oblique direction. When the pull plate moves in the horizontal direction relative to the table top, it can drive the movable plate to approach or move away from the bottom plate in the vertical direction.

Preferably, a bottom plate fixedly connected to the first long side and the first short side is provided under the table top, the bottom plate and the movable plate are movably matched in the vertical direction, and the pull plate and the bottom plate are movably matched in the horizontal direction.

Preferably, a plurality of through holes are provided on the base plate, a connecting rod is provided in the through hole, both ends of the connecting rod are provided with internal threads, the fixing clamp and the movable plate are respectively screwed and fixed to the two ends of the connecting rod; an oil-free bushing is fixed in the through hole and freely cooperates with the connecting rod in the vertical direction.

Preferably, a plurality of guide posts arranged in the vertical direction are fixed on the bottom plate, and an oil-free bushing slidably matched with the guide posts is fixed on the movable plate.

Preferably, the guide column includes a fixing bolt and a fixing rod, and the end of the fixing rod is provided with an internal thread; a fixing hole is provided on the bottom plate, and the fixing bolt passes through the fixing hole from the upper surface of the bottom plate to connect with the fixing rod provided on the lower surface of the bottom plate.

Preferably, the end of the fixing rod is set to a square shape, the fixing holes are set to countersunk holes on the upper and lower surfaces of the base plate, the nut of the fixing bolt is sunk into the upper surface of the base plate, and the countersunk hole on the lower surface of the base plate is set to a square countersunk hole that matches the end of the fixing rod.

Preferably, the pull plate is vertically arranged below the bottom plate and located on the side of the movable plate, and a plurality of horizontal grooves and oblique grooves are arranged on the surface of the pull plate; a plurality of guide seats are fixed at positions corresponding to the horizontal grooves on the lower surface of the bottom plate, and both sides of the pull plate are respectively in contact with the movable plate and the guide seats; a first bearing rollingly matched with the horizontal grooves is fixed on the guide seat;

A traction shaft is fixedly arranged on one side of the movable plate facing the pulling plate, and a second bearing rollingly matched with the inclined groove is fixedly arranged on the traction shaft.

Preferably, the guide seat is a cubic structure, and a concave square guide groove is provided on the lower surface of the bottom plate, and the guide seat is fixed in the guide groove.

Preferably, a plurality of limiting columns are respectively fixed to the bottom plate along both sides of the pull plate, and the limiting columns clamp and fix the pull plate.

Preferably, a cylinder is fixed to the end of the pull plate, a power output end of the cylinder is fixedly connected to the pull plate, and the pull plate can move along the horizontal direction following the cylinder.

Preferably, the movable clamp includes a fixed seat and a clamping plate. The fixed seat is fixed to the bottom of the table and slidably cooperates with the first slide groove or the second slide groove. The clamping plate is fixed above the table and movably cooperates with the fixed seat in the vertical direction. The downward movement of the clamping plate can press the PCB board.

Preferably, a clamping portion is arranged above the fixed seat, and the clamping portion has a connecting block that cooperates with the first slide groove or the second slide groove, and the connecting block extends on both sides of the vertical sliding direction to form a clamping plate; a clamping plate groove is arranged on the fixed seat and passes through the clamping portion and the fixed seat in the vertical direction, and the clamping plate member is connected to a lifting cylinder through the clamping plate groove; the clamping plate member includes a matching block that cooperates with the clamping plate groove, and the matching block extends at least to both sides of the vertical sliding direction and in the direction toward the PCB board to form a clamping plate.

Preferably, the clamping plate groove has a length along the movable direction of the clamping portion, and the connecting block is slidably matched with the clamping plate groove along the length direction.

Preferably, the fixed seat is an L-shaped structure, the top of which is slidably matched with the table top 1, and a telescopic cylinder is arranged on the side; the lifting cylinder is fixed on a cylinder seat, and the power output end of the telescopic cylinder is fixedly connected to the cylinder seat; a slide rail is arranged on the fixed seat along the sliding direction of the connecting block, and a slider is slidably arranged on the slide rail, and the slider is fixedly matched with the cylinder seat.

Preferably, the clamping plate sinks downward along the area swept by the sliding path of the connecting block to form a receiving groove, and the side of the clamping plate close to the PCB board protrudes upward relative to the receiving groove to form a positioning plate, and the clamping plate extends on both sides of the vertical sliding direction relative to the matching block, and the clamping plate extends to one side of the PCB board to form a movable pressure plate, and when the movable pressure plate contacts the top of the positioning plate, the receiving groove supports the bottom of the movable pressure plate.

Preferably, the upper surface of the table top is provided with concave sedimentation grooves at positions where the first slide groove and the second slide groove are provided, respectively, and when the movable clamp cooperates with the first slide groove or the second slide groove, the clamping plate is accommodated in the sedimentation groove.

The advantages of the PCB board clamp provided by the present invention are: PCB boards of various sizes can be conveniently fixed on the table through the cooperation of the fixed clamp and the movable clamp, and the four sides of the PCB board can be fixed at the same time, effectively solving the problem of PCB board warping during inkjet printing; the movable plate is driven to move vertically by the horizontal movement of the pulling plate to control the simultaneous lifting and lowering of the fixed clamp, which is easy to control and has good promotion prospects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a PCB board fixture provided by an embodiment of the present invention;

FIG2 is a schematic diagram of a table of a PCB board fixture provided in Embodiment 1 of the present invention;

FIG3 is a schematic diagram of a fixing fixture of a PCB board fixture provided by an embodiment of the present invention;

4 is a schematic diagram of the cooperation between the bottom plate of the PCB board fixture provided by an embodiment of the present invention and the movable plate and the pull plate;

FIG5 is an exploded view of FIG4;

FIG6 is an exploded view of the connecting rod assembly of the PCB board clamp provided by an embodiment of the present invention;

7 is a schematic diagram of a guide seat of a PCB board fixture provided in an embodiment of the present invention;

FIG8 is a schematic diagram of a traction shaft of a PCB board fixture provided in an embodiment of the present invention;

9 is an exploded view of the assembly of the guide column of the PCB board fixture provided by an embodiment of the present invention;

10 is a schematic diagram of a movable fixture of a PCB board fixture provided in Embodiment 1 of the present invention;

11 is a schematic diagram of a clamping plate of a PCB board clamp provided in Embodiment 1 of the present invention;

12 is a schematic diagram of a table top of a PCB board fixture provided in Embodiment 2 of the present invention;

13 is a schematic diagram of a movable fixture of a PCB board fixture provided in Embodiment 2 of the present invention;

14 is a side view of the movable fixture of the PCB board fixture provided in the second embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

Embodiment 1

As shown in FIG1 , a PCB board fixture comprises a table top 1 of a rectangular structure, wherein the upper and lower directions in the present application are described with the working surface of the table top 1 as the upper side; fixed fixtures 2 are respectively arranged on the adjacent first long side 11 and first short side 12 of the table top, and a plurality of movable fixtures 3 are arranged in the middle area of the table top 1, wherein the movable fixtures 3 can change positions along the directions perpendicular to the first long side 11 and the first short side 12 respectively; during operation, a PCB board 4 is placed on the table top 1, and two sides of the PCB board 4 are respectively pressed against the fixed fixtures 2 of the first long side 11 and the first short side 12, and the movable fixtures 3 are moved to press against the other two sides of the PCB board 4, so that the four sides of the PCB board 4 can be fixed on the table top 1, thereby preventing the PCB board 4 from warping up during inkjet printing.

The table top 1 is also provided with a first slide groove 15 perpendicular to the first long side 11 and a second slide groove 16 perpendicular to the first short side 12; a plurality of the first slide grooves 15 are arranged side by side along the second long side 13, and a plurality of the second slide grooves 16 are arranged side by side along the second short side 14, and the second slide groove 16 is arranged in the area of the second short side 14 close to the first long side 11, and the first slide groove 15 close to the second short side 14 extends from the second long side 13 to the second slide groove 16, and along the length direction of the second long side 13, the length of the first slide groove 15 close to the first short side 12 is gradually extended, and similarly, the length of the second slide groove 16 close to the first long side 11 is also gradually extended; thereby, the first slide groove 15 and the second slide groove 16 form a step-type layout.

A movable fixture 3 is movably disposed in each of the first slide groove 15 and the second slide groove 16 , and the movable fixture 3 slides along the first slide groove 15 and the second slide groove 16 to change position to meet the use requirements of PCB boards 4 of different sizes.

In combination with Figures 2 and 3, a plurality of clamp grooves 17 are provided on the upper surface of the table top 1 along the first long side 11 and the first short side 12. The fixing clamp 2 includes a fixing key 21 that cooperates with the clamp groove 17. The upper surface of the fixing key 21 extends at least toward one side of the working area of the table top 1 to form a fixing pressure plate 22. The fixing key 21 can slide along the clamp groove 17 relative to the table top 1 to change its height; the fixing pressure plate 22 can press the PCB board 4 by following the fixing key 21 to move downward; in order to ensure that the fixing clamp 2 can maintain balance when pressing the PCB board 4, the fixing pressure plate 22 is beyond the upper surface of the fixing key 21 on all sides.

Referring to Fig. 4 and Fig. 5, a bottom plate 5 is fixedly connected to the lower surface of the table top 1 along the first long side 11 and the first short side 12, respectively. A movable plate 6 is arranged below the bottom plate 5 to be movably matched with the bottom plate 5 in the vertical direction, and a pull plate 7 is movably matched with the bottom plate 5 in the horizontal direction. The pull plate 7 is movably matched with the side surface of the movable plate 6 in the oblique direction. The movable plate 6 is fixedly matched with the fixing fixture 2. The pulling plate 7 can drive the movable plate 6 to move in the vertical direction relative to the bottom plate 5 when it moves in the horizontal direction relative to the bottom plate 5, and the fixing fixture 2 can follow the movable plate 6 to move in the vertical direction.

A plurality of guide posts 51 arranged in the vertical direction are fixed on the base plate 5, and the movable plate 6 is slidably matched with the guide posts 51. In a preferred embodiment, an oil-free bushing (not shown) is fixed on the movable plate, and the guide post 51 is slidably matched with the oil-free bushing.

In conjunction with Figure 6, a through hole (not shown) is also provided on the base plate 5, and the movable plate 6 and the fixed fixture 2 are freely passed through the through hole for fixed cooperation; specifically, a connecting rod 53 is provided in the through hole, and both ends of the connecting rod 53 have internal threads, and the fixed fixture 2 and the movable plate 6 are fixedly connected to the connecting rod 53 by bolts (not shown), respectively, and the two ends of the connecting rod 53 are respectively pressed against the movable plate 6 and the fixed fixture 2, and the connecting rod 53 is slidably cooperated with the oil-free bushing (not shown) fixed in the through hole, so that when the movable plate 6 moves relative to the guide column 51, it can drive the fixed fixture 2 to move up and down along the fixture groove 17.

In conjunction with FIG7 , the pull plate 7 is arranged on the side of the movable plate 6, and a plurality of horizontal grooves 71 and oblique grooves 72 are respectively arranged on the surface of the pull plate 7. A plurality of guide seats 54 are fixed on the lower surface of the bottom plate 5. The pull plate 7 is vertically arranged below the bottom plate 5, and the two sides of the pull plate 7 are respectively in contact with the movable plate 6 and the guide seats 54. The guide seats 54 are provided with bolts (not shown) facing the pull plate 7, and a first bearing 541 rollingly matched with the horizontal groove 71 is fixed on the bolts, and the pull plate 7 can move in the horizontal direction relative to the bottom plate 5 through the horizontal groove 71. In a preferred embodiment, a guide groove 542 for accommodating the guide seat 54 is arranged in a concave shape on the lower surface of the bottom plate 5, thereby limiting the left and right shaking of the guide seat 54.

In this embodiment, the guide seat 54 is a cubic structure, and the guide groove 542 is a square groove.

Referring to Figure 8, a traction shaft 61 is provided on the side of the movable plate 6 facing the pulling plate 7. A second bearing 611 rollingly engaged with the inclined groove 72 is fixed on the traction shaft 61. When the pulling plate 7 moves in the horizontal direction, the traction shaft 61 moves along the inclined groove 72, thereby changing the height of the movable plate 6.

The lower surface of the base plate 5 is provided with a plurality of limit columns 55 on both sides along the pull plate 7. The limit columns 55 clamp and fix the pull plate 7 to ensure that the pull plate 7 always moves perpendicular to the base plate 5, thereby preventing the pull plate 7 from tilting during movement and generating torque that affects the service life of the bolts of the traction shaft 61 and the guide seat 54.

Referring to Figure 5 again, a limit block 73 is protruding from one side of the pull plate 7 toward the bottom plate 5, and a limit groove 57 cooperating with the limit block 73 is provided on the lower surface of the bottom plate 5. The limit block 73 can slide along the limit groove 57, thereby further ensuring that the pull plate 7 remains in a vertical state during the movement.

A cylinder 8 is fixed to the end of the pull plate 7, and the power output end of the cylinder 8 is fixedly connected to the pull plate 7. The cylinder 8 can drive the pull plate 7 to move in the horizontal direction; the cylinder 8 is connected to the vacuum device through a pipeline.

Referring to FIG9 , the guide column 51 includes a fixing bolt 511 and a fixing rod 512, and the end of the fixing rod is provided with an internal thread; a fixing hole 56 for fixing the guide column 5 is provided on the bottom plate 5, and the fixing bolt 511 passes through the fixing hole 56 from the upper surface of the bottom plate 5 to connect the fixing rod 512 provided on the lower surface of the bottom plate 5, thereby forming the guide column 51; the fixing hole 56 is provided with countersunk holes on both the upper and lower surfaces of the bottom plate 5, so that the nut of the fixing bolt 511 and the end of the fixing rod 512 are hidden in the bottom plate 5. In a preferred embodiment, the end of the fixing rod 512 is set to be square, and the countersunk hole matched with the fixing rod 512 is also set to be a square countersunk hole, so that the fixing bolt 511 is convenient for tightening and fixing.

The limiting column 55 can be configured to have the same structure as the guide column 51 .

Referring to Figure 10, the movable clamp 3 includes a fixed seat 31 and a clamping plate 32; the fixed seat 31 is fixed to the bottom of the table top 1 and slidably cooperates with the first slide groove 15 and the second slide groove 16; the clamping plate 32 is arranged above the table top 1 and movably cooperates with the fixed seat 31 along the vertical direction; the clamping plate 32 can move downward to press the edge of the PCB board 4.

A clamping portion 33 is provided above the fixed seat 31, and the clamping portion 33 has a connecting block 331 that cooperates with the first slide groove 15 and the second slide groove 16. The connecting block 331 extends on both sides of the vertical sliding direction to form a clamping plate 332. When the movable clamp 3 cooperates with the first slide groove 15 and the second slide groove 16, the upper surface of the fixed seat 31 abuts against the lower surface of the table top 1, and the lower surface of the clamping portion 33 abuts against the upper surface of the table top 1; the connecting block 331 can move along the first slide groove 15 and the second slide groove 16.

The fixing seat 31 is provided with a clamping plate groove 311, which penetrates the clamping portion 33 and the fixing seat 31 in the vertical direction, and the clamping plate member 32 can move vertically relative to the fixing seat 31 along the clamping plate groove 311. Referring to FIG11 , the clamping plate member 32 includes a matching block 321 that matches the clamping plate groove 311, and the matching block 321 extends at least to both sides of the vertical sliding direction of the fixing seat 31 and toward the PCB board 4 to form a clamping plate 322. A lifting cylinder 34 is provided below the fixing seat 31, and the power output end of the lifting cylinder 34 is fixedly connected to the matching block 321. The clamping plate member 32 can move in the vertical direction under the drive of the lifting cylinder 34, and the clamping plate 322 can be pressed against the edge of the PCB board 4.

When in use, place the PCB board 4 on the table 1, so that the two sides of the PCB board 4 are respectively in contact with the fixed keys 21 at the first long side 11 and the second long side 12; at the same time, slide the movable clamp 3 along the first slide groove 15 and the second slide groove 16, so that the matching block 321 is in contact with the other two sides of the PCB board 4, and then move the fixed clamp 2 and the movable clamp 3 to press the PCB board 4.

The lower surface of the PCB board 4 will be pressed on the upper surface of the clamping plate 332. In order to prevent the clamping plate 332 from lifting the PCB board 4, the upper surface of the table 1 is provided with concave sedimentation grooves 18 along the first slide groove 15 and the second slide groove 16 respectively. The clamping plate 332 is accommodated in the sedimentation groove 18, so that the upper surface of the clamping plate 332 is hidden under the surface of the table 1.

Embodiment 2

Referring to Figure 12, the difference between this embodiment and embodiment 1 is that the first slide groove 15 and the second slide groove 16 are respectively arranged on the table top 1 along the length direction of the second long side 13 and the second short side 14; and the endpoints of the first slide groove 15 and the second slide groove 16 are extended to the diagonal line of the table top 1, so that the first slide groove 15 and the second slide groove 16 are arranged in a step-like manner on the entire table top 1.

Referring to Figure 13, the clamping plate part 32 of the movable clamp 3 provided in this embodiment can also movably cooperate with the clamping plate groove 311 along the sliding direction of the connecting block 331, and the lifting cylinder 34 is fixed on the cylinder seat 341, and the cylinder seat 341 and the fixed seat 31 slide together along the length direction of the clamping plate groove 311.

A slide rail 35 is fixed to the bottom of the fixing seat 31, and the slide rail 35 is arranged along the length direction of the clamping plate groove 311. A slider 351 is slidably arranged on the slide rail 35, and the slider 351 is fixedly matched with the cylinder seat 341. The cylinder seat 341 can slide along the slide rail 35 following the slider 351, thereby driving the lifting cylinder 34 to move.

A telescopic cylinder 36 facing the lifting cylinder 34 is fixedly provided on one side of the fixed seat 31 along the sliding direction. The power output end of the telescopic cylinder 36 is fixedly connected to the cylinder seat 341, and the telescopic cylinder 36 drives the cylinder seat 341 to move along the slide rail 35.

The fixing seat 31 is configured as an L-shaped structure, the top of which is slidably connected to the tabletop 1 , and the side of which is fixedly connected to the telescopic cylinder 36 .

When using the PCB board clamp provided in this embodiment, after the two sides of the PCB board 4 are respectively abutted against the fixed keys 21 at the first long side 11 and the second long side 12, the movable clamp 3 is slid along the first slide groove 15 and the second slide groove 16 respectively to fix the movable clamp 3 at a position with a certain distance from the PCB board 4; the clamping plate 32 is lifted up by the lifting cylinder 34, and then the clamping plate 32 is slid along the clamping plate groove 311 to the edge of the PCB board 4 by the telescopic cylinder 36, and then the lifting cylinder 34 drives the clamping plate 32 to descend, and the clamping plate 322 is pressed tightly against the PCB board 4.

When using the movable clamp 3 provided in this embodiment, it is inconvenient to determine the distance between the PCB board 4 and the movable clamp 3. In a preferred embodiment, a positioning plate 333 protruding upward is provided on the side of the clamping plate 332 close to the PCB board 4. After the telescopic cylinder 36 drives the matching block 321 to move to the edge of the positioning plate 333, the lifting cylinder 34 drives the clamping plate 322 to descend and press the PCB board 4. At this time, the edge of the PCB board 4 can be placed overlapping with the edge of the positioning plate 333.

At this time, after the clamping plate 322 falls on the positioning plate 333, the two sides of the clamping plate 322 will leave the upper surface of the clamping plate 332, and the clamping plate 322 cannot be supported by the clamping plate 332, which will affect the life and use effect of the clamping plate 322. In addition, if the thickness of the clamping plate 332 is further increased, the thickness of the sedimentation tank 18 also needs to be increased, which will reduce the matching strength of the first chute 15 and the second chute 16 with the movable clamp 3.

In the preferred embodiment, along the area where the connecting block 331 slides and sweeps through the clamping plate groove 311, the clamping plate 332 sinks downward to form a receiving groove 334, so that the part of the clamping plate 332 close to the PCB board 4 forms an upwardly protruding positioning plate 333 relative to the receiving groove 334, and the clamping plate 322 extends on both sides of the vertical sliding direction relative to the matching block 321, and the clamping plate 322 extends to one side of the PCB board 4 to form a movable pressure plate 323 that cooperates with the positioning plate 333.

When in use, the edge of the PCB board 4 is aligned with the edge of the accommodating groove 334, the movable pressing plate 323 presses the PCB board 4, and the accommodating groove 334 supports the bottom of the clamping plate 322 to prevent the movable pressing plate 323 from being deformed too much.

The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Without departing from the spirit and principles of the present invention, any modifications, equivalent substitutions, improvements, etc. made to the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims (4)

1. A PCB board anchor clamps, its characterized in that: the table top comprises a table top with a rectangular structure, wherein a fixed clamp is respectively arranged on a first long side and a first short side which are adjacent to each other of the table top, and a plurality of movable clamps are respectively arranged in the middle area of the table top; the movable clamp can change positions along the direction perpendicular to the first long side or the first short side of the table top respectively; the PCB board is placed on the table top, and four sides of the PCB board are respectively pressed and fixed by the fixed clamp and the movable clamp;

The first long side and the first short side are respectively and uniformly provided with a plurality of clamp grooves along the length direction, the fixed clamp comprises a fixed key matched with the clamp grooves, the upper surface of the fixed key extends at least to one side of the table surface working area to form a fixed pressing plate, and the fixed key can move up and down along the clamp grooves to change positions;

A bottom plate is respectively fixed below the first long side and the first short side of the table top, a movable plate which is movably matched with the bottom plate along the vertical direction and fixedly connected with a fixed clamp, and a pull plate which is matched with the bottom plate along the horizontal direction are arranged below the bottom plate, and the pull plate is obliquely and movably matched with the side surface of the movable plate;

The bottom plate is provided with a plurality of through holes, a connecting rod is arranged in each through hole, internal threads are arranged at two ends of each connecting rod, and the fixed clamp and the movable plate are respectively in threaded connection and fixed with two ends of each connecting rod; an oilless bushing which is freely matched with the connecting rod along the vertical direction is fixed in the through hole; a plurality of guide posts arranged along the vertical direction are fixed on the bottom plate, and oil-free bushings in sliding fit with the guide posts are fixed on the movable plate; the guide post comprises a fixing bolt and a fixing rod, and the end part of the fixing rod is provided with an internal thread; the bottom plate is provided with a fixing hole, and the fixing bolt penetrates through the fixing hole from the upper surface of the bottom plate to be connected with a fixing rod arranged on the lower surface of the bottom plate;

The pull plate is vertically arranged below the bottom plate and positioned on the side surface of the movable plate, and a plurality of horizontal grooves and inclined grooves are formed in the surface of the pull plate; a plurality of guide seats are fixed on the lower surface of the bottom plate at positions corresponding to the horizontal grooves, and two sides of the pull plate are respectively abutted with the movable plate and the guide seats; a first bearing in rolling fit with the horizontal groove is fixed on the guide seat; a traction shaft is fixedly arranged on one side of the movable plate, facing the pull plate, and a second bearing in rolling fit with the chute is fixedly arranged on the traction shaft; the bottom plate is respectively fixed with a plurality of limit posts along two sides of the pulling plate, and the limit posts clamp and fix the pulling plate; the end part of the pulling plate is fixedly provided with an air cylinder, and the power output end of the air cylinder is parallel to the horizontal direction of the pulling plate and is fixedly connected with one end of the horizontal direction of the pulling plate;

The movable clamp comprises a fixed seat and a clamping plate piece, the fixed seat is fixed at the bottom of the table top and is in sliding fit with the first sliding groove or the second sliding groove, the clamping plate piece is fixed above the table top and is in movable fit with the fixed seat along the vertical direction, and the clamping plate piece can press the PCB by moving downwards; a clamping part is arranged above the fixed seat, the clamping part is provided with a connecting block matched with the first sliding groove or the second sliding groove, and two sides of the connecting block in the vertical sliding direction extend to form a clamping plate; the fixing seat is provided with a clamping plate groove penetrating through the clamping part and the fixing seat along the vertical direction, and the clamping plate piece penetrates through the clamping plate groove and is connected with a lifting cylinder; the clamping plate piece comprises a matching block matched with the clamping plate groove, and the matching block at least extends to two sides in the vertical sliding direction and the direction towards the PCB to form a clamping plate respectively;

The clamping plate groove is provided with a length along the moving direction of the clamping part, and the connecting block is in sliding fit with the clamping plate groove along the length direction; the fixed seat is of an L-shaped structure, the top of the fixed seat is in sliding fit with the table top, and a telescopic cylinder is arranged on the side face of the fixed seat; the lifting cylinder is fixed on a cylinder seat, and the power output end of the telescopic cylinder is fixedly connected with the cylinder seat; a sliding rail is arranged on the fixed seat along the sliding direction of the connecting block, a sliding block is arranged on the sliding rail in a sliding manner, and the sliding block is fixedly matched with the cylinder seat; the clamping plate is downwards settled along the area swept by the sliding path of the connecting block to form a containing groove, one side, close to the PCB, of the clamping plate protrudes upwards relative to the containing groove to form a positioning plate, the clamping plates are arranged in an extending mode relative to the two sides of the matching block in the vertical sliding direction, the clamping plates extend to one side of the PCB to form a movable pressing plate, and when the movable pressing plate is in contact with the top of the positioning plate, the containing groove supports the bottom of the movable pressing plate.

2. A PCB board clamp according to claim 1, characterized in that: the table top is provided with a first chute perpendicular to the first long side and a second chute perpendicular to the first short side, and a movable clamp is respectively arranged in each of the first chute and the second chute.

3. A PCB board clamp according to claim 2, characterized in that: the first sliding grooves are arranged along the second long sides, the second sliding grooves are arranged in the area close to the first long sides along the second short sides, and the first sliding grooves close to the second short sides extend from the second long sides to the second sliding grooves closest to the second long sides; the lengths of the first sliding groove close to the first short side and the second sliding groove close to the first long side are gradually increased, and the first sliding groove and the second sliding groove form a step-type layout.

4. A PCB board clamp according to claim 1, characterized in that: the upper surface of the table top is provided with a concave sedimentation tank at the position where the first chute and the second chute are arranged, and the clamping plate is accommodated in the sedimentation tank when the movable clamp is matched with the first chute or the second chute.