Positioning top plate assembly and equipment

Abstract

The utility model provides a positioning top plate assembly and equipment. The positioning top plate assembly comprises a jig base, and a plurality of positioning holes arranged in an array are formed in the jig base; the positioning top plate assembly further comprises a top plate jig, the top plate jig is provided with a supporting part and more than two jig positioning parts, the supporting part is arranged at the top of the top plate jig, and each jig positioning part is arranged at the bottom of the top plate jig; one jig positioning part is matched with one positioning hole in an inserting manner, so that the top plate jig is detachably mounted on the jig base; a fixing part is arranged on the side, away from the top plate jig, of the jig base. The top plate jig comprises a jig bottom plate and a plurality of supporting pieces. The supporting pieces are fixed to the top wall of the jig bottom plate, and the supporting parts are located at the tops of the supporting pieces. And each jig positioning part is positioned on the bottom wall of the jig bottom plate. The positioning top plate assembly is accurate in positioning, and the top plate jig is easy to insert and not prone to toppling over.

Description

TECHNICAL FIELD

[0001] The utility model relates to the positioning device field of printing machine, and specifically relates to a positioning top plate assembly and equipment. BACKGROUND

[0002] The existing circuit board positioning top plate assembly of the tin printing machine usually has two different structures: one is pure pin type, and the other is magnetic type, and the two structures have advantages and disadvantages. The printing machine with the pure pin type structure has the advantages of accurate positioning and not moving or toppling due to accidental touching, but has the disadvantage of more support pieces to be pulled out when changing the machine type, which is more time-consuming. The printing machine with the magnetic type structure has the advantages of convenient machine type switching and less time loss, but has the disadvantage of easy movement or toppling of the support pieces, which makes it difficult to ensure the accuracy of positioning. SUMMARY

[0003] The first object of the utility model is to provide a positioning top plate assembly with accurate positioning, easy insertion of the top plate jig and difficulty in toppling.

[0004] The second object of the utility model is to provide another positioning top plate assembly with accurate positioning, easy insertion of the top plate jig and difficulty in toppling.

[0005] The third object of the utility model is to provide an equipment with the above positioning top plate assembly.

[0006] To achieve the above first object, the utility model provides a positioning top plate assembly, which comprises a jig base, and a plurality of positioning holes arranged in an array on the jig base; the positioning top plate assembly further comprises a top plate jig, the top plate jig is provided with a support part and two or more jig positioning parts, the support part is arranged at the top of the top plate jig, and each jig positioning part is arranged at the bottom of the top plate jig; one jig positioning part is inserted and matched with one positioning hole, so that the top plate jig is detachably mounted on the jig base; a fixed part is arranged on the side of the jig base away from the top plate jig. The top plate jig comprises a jig bottom plate and a plurality of support pieces; each support piece is fixed to the top wall of the jig bottom plate, and the support part is located at the top of the support piece; each jig positioning part is located at the bottom wall of the jig bottom plate.

[0007] From the above scheme can be seen, by setting the jig bottom plate, each support is set on the jig bottom plate, the jig bottom plate can be disassembled, each support can be installed on the jig base or simultaneously disassembled from the jig base, without the need for individual plug-in support, thereby reducing the number of components that need to be plugged in, thereby improving operational efficiency, at the same time, the plug-in structure can ensure the accuracy of the positioning of each support, while improving the stability of the connection. In addition, the support can be designed as a needle, such a structure can make the positioning top plate assembly suitable for the printing of the circuit board with elements welded on the bottom surface, or the support can also be designed as a block, such a structure can make the positioning top plate assembly suitable for the printing of the circuit board without elements welded on the bottom surface. The positioning top plate assembly of the utility model has higher positioning accuracy than the traditional positioning jig, has smaller risk of touching and crushing elements, provides greater and more reasonable stress to the bottom surface of the circuit board, and effectively reduces the time for model switching through the integrated assembly design, thereby greatly improving the production efficiency of enterprises.

[0008] One preferred scheme is that the jig bottom plate is provided with at least one jig positioning part at each end in the length direction; and / or each support is provided with a support part, and the support parts are coplanar.

[0009] Therefore, the jig positioning part is arranged at each end in the length direction of the jig bottom plate, which can ensure stable connection of the jig bottom plate and the jig base. The support parts are coplanar, which ensures stable contact of each support part with the surface of the circuit board, thereby realizing stable support of the circuit board.

[0010] One preferred scheme is that the top plate jig further comprises a jig handle, the jig handle is arranged on the top wall of the jig bottom plate, the number of the jig handles is two or more, and at least one jig handle is arranged at each end in the length direction of the jig bottom plate; and / or a base reference line is arranged at the middle of the length direction of the jig base, and a bottom plate reference line is arranged at the middle of the length direction of the jig bottom plate, and the bottom plate reference line is aligned with the base reference line.

[0011] Therefore, the jig handle is arranged, which facilitates the operator to install and disassemble the top plate jig through the jig handle. The base reference line arranged on the jig base and the bottom plate reference line arranged on the jig bottom plate facilitate accurate positioning of the jig bottom plate and ensure stable support.

[0012] One preferred scheme is that the support is columnar; the support comprises a first support section and a second support section arranged along the axial direction of the support, the diameter of the first support section is greater than that of the second support section, the second support section is arranged at the top end of the first support section, and the support part is located at one end of the first support section away from the second support section.

[0013] Therefore, the support member is in a columnar shape, and is provided with two support sections with different diameters, and the second support section with a small diameter is in contact with the circuit board, so that the second support section with a small diameter can save material, reduce weight and cost, and the contact area between the second support section with a small diameter and the circuit board is small, and the support member can further avoid touching and damaging elements on the circuit board.

[0014] To achieve the above-mentioned second object, the utility model provides another kind of positioning top plate assembly, including jig base, and jig base is arranged with multiple positioning holes in array arrangement;Positioning top plate assembly further includes top plate jig, and top plate jig is provided with support part and more than two jig positioning parts, and support part is arranged at the top of top plate jig, and each jig positioning part is arranged at the bottom of top plate jig;One jig positioning part is inserted and matched with one positioning hole, so that top plate jig is detachably installed on jig base;The side, away from top plate jig, of jig base is provided with fixed part.The number of top plate jigs is multiple, and each top plate jig is arranged along the length direction of jig base;Each top plate jig extends along the width direction of jig base.

[0015] From the above-mentioned scheme, by setting the top plate jig with more than two jig positioning parts, the number of components that need to be inserted and pulled can be reduced, and the operation efficiency can be improved, and the insertion and pulling structure can ensure the accuracy of positioning and improve the connection stability.In addition, each top plate jig extends along the width direction of the jig base, and the printing machine doctor blade is placed horizontally and moves forward and backward, i.e., moves along the width direction of the jig base, therefore, each top plate jig extends along the width direction of the jig base, so that the circuit board is more evenly stressed when being printed.The long strip-shaped top plate jig can make the positioning top plate assembly suitable for printing the circuit board without welding or elements on the bottom surface.

[0016] One preferred scheme is that the middle part of the length direction of the jig base is provided with a base reference line, and the straight line where the base reference line is located passes through the center of one column of positioning holes, and one top plate jig is inserted and matched with the positioning holes in the column.

[0017] From the above-mentioned scheme, by setting the top plate jig with more than two jig positioning parts, the number of components that need to be inserted and pulled can be reduced, and the operation efficiency can be improved, and the insertion and pulling structure can ensure the accuracy of positioning and improve the connection stability.In addition, each top plate jig extends along the width direction of the jig base, and the printing machine doctor blade is placed horizontally and moves forward and backward, i.e., moves along the width direction of the jig base, therefore, each top plate jig extends along the width direction of the jig base, so that the circuit board is more evenly stressed when being printed.The long strip-shaped top plate jig can make the positioning top plate assembly suitable for printing the circuit board without welding or elements on the bottom surface.

[0018] A further scheme is that each top plate jig is symmetrically arranged with the base reference line as the center line.

[0019] From the above-mentioned scheme, by setting the top plate jig with more than two jig positioning parts, the number of components that need to be inserted and pulled can be reduced, and the operation efficiency can be improved, and the insertion and pulling structure can ensure the accuracy of positioning and improve the connection stability.In addition, each top plate jig extends along the width direction of the jig base, and the printing machine doctor blade is placed horizontally and moves forward and backward, i.e., moves along the width direction of the jig base, therefore, each top plate jig extends along the width direction of the jig base, so that the circuit board is more evenly stressed when being printed.The long strip-shaped top plate jig can make the positioning top plate assembly suitable for printing the circuit board without welding or elements on the bottom surface.

[0020] One preferred scheme is that the adjacent two top plate jigs are arranged in a staggered manner in the width direction of the jig base.

[0021] Therefore, by arranging the top plate jigs in a staggered manner, a larger area of circuit board can be supported, thereby improving the versatility of the positioning top plate assembly.

[0022] To achieve the above-mentioned third object, the utility model provides a kind of equipment, including the positioning top plate assembly described above.

[0023] One preferred scheme is that the equipment is a printing machine, and the equipment further includes a solder paste scraper, a steel mesh, a workbench, a moving platform and a driving device; the jig base is installed on the moving platform through the fixing portion, and the driving device is arranged on the workbench; the steel mesh is located above the positioning top plate assembly, and the solder paste scraper is located above the steel mesh, and the solder paste scraper can move along the width direction of the jig base; the steel mesh and the positioning top plate assembly have a printing position therebetween, and the printing position is used for placing a circuit board; the driving device can drive the moving platform to move in the vertical direction, the moving platform can drive the positioning top plate assembly to move vertically upward, the support portion of the positioning top plate assembly lifts the circuit board at the printing position, until the circuit board is attached to the steel mesh. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is the structure diagram of the first embodiment of the utility model equipment.

[0025] Figure 2 is the structure diagram of the first embodiment of the positioning top plate assembly of the utility model.

[0026] Figure 3 is the structure diagram of the jig base in the first embodiment of the positioning top plate assembly of the utility model.

[0027] Figure 4 is the structure diagram of the top plate jig in the first embodiment of the positioning top plate assembly of the utility model from the first perspective.

[0028] Figure 5 is the structure diagram of the top plate jig in the first embodiment of the positioning top plate assembly of the utility model from the second perspective.

[0029] Figure 6 is the schematic diagram of the top plate jig design drawing and the circuit board coordinate file after mutual superposition in the first embodiment of the positioning top plate assembly of the utility model.

[0030] Figure 7 is the structure diagram of the second embodiment of the positioning top plate assembly of the utility model.

[0031] Figure 8 is the structure diagram of the top plate jig in the second embodiment of the positioning top plate assembly of the utility model.

[0032] Figure 9 is the structure diagram of the third embodiment of the positioning top plate assembly of the utility model.

[0033] The utility model will be further described below in combination with the drawings and embodiments. DETAILED DESCRIPTION

[0034] Positioning top plate assembly and equipment first embodiment:

[0035] Referring to Figure 1 , the equipment in the embodiment is a printing machine, and in other embodiments, the equipment can also be a chip mounter, AOI (automatic optical inspection equipment), SPI (solder paste inspection equipment) and other equipment with a top plate mechanism.

[0036] The printing machine of the embodiment comprises a positioning top plate assembly 1, a solder paste scraper 2, a steel mesh 3, a workbench 4, a moving platform 5 and a driving device 6. Preferably, the driving device 6 is a motor.

[0037] The jig base 11 of the positioning top plate assembly 1 is installed on the moving platform 5, the driving device 6 is arranged on the workbench 4, the steel mesh 3 is located above the positioning top plate assembly 1, the solder paste scraper 2 is located above the steel mesh 3, and the solder paste scraper 2 can move along the width direction of the jig base 11.

[0038] A transport track 10 for conveying the circuit board 7 forward on the production line is located between the steel mesh 3 and the positioning top plate assembly 1, and the transport track 10 has a printing position 101 for placing the circuit board 7 and is opposite to the positioning top plate assembly 1 in the vertical direction.

[0039] After the circuit board 7 is conveyed to the printing position 101 by the transport track 10, the driving device 6 drives the moving platform 5 to move upward along the vertical direction, the moving platform 5 can drive the positioning top plate assembly 1 to rise, the support part 1233 of the positioning top plate assembly 1 lifts the circuit board 7 at the printing position 101 until the circuit board 7 is attached to the steel mesh 3, then the solder paste scraper 2 is pressed downward, and the solder paste on the steel mesh 3 is printed on the circuit board 7 by moving forward and backward.

[0040] Referring to Figures 2 to 5 , the positioning top plate assembly 1 comprises a jig base 11 and a top plate jig 12, a plurality of positioning holes 111 arranged in an array are arranged on the jig base 11, and the positioning holes 111 penetrate through the jig base 11 along the thickness direction. The jig base 11 is made of aluminum alloy.

[0041] The top plate jig 12 comprises a jig bottom plate 121, two or more jig handles 122 and a plurality of support parts 123, each support part 123 is fixed to the top wall of the jig bottom plate 121, the top of each support part 123 is provided with a support part 1233, and each support part 1233 is arranged in a plane, so that each support part 1233 stably contacts the surface of the circuit board 7, thereby realizing stable support of the circuit board 7.

[0042] The bottom wall of the jig bottom plate 121 is provided with two or more jig positioning portions 1211, one of which is inserted into one of the positioning holes 111, so that the top plate jig 12 can be detachably mounted on the jig base 11. In addition, the side of the jig base 11 away from the top plate jig 12 is provided with a fixing portion 113 for fixing the jig base 11 to the moving platform 5. The lengthwise ends of the jig bottom plate 121 are each provided with at least one jig positioning portion 1211 to ensure stable connection of the jig bottom plate 121 to the jig base 11. In this embodiment, the number of jig positioning portions 1211 is five, and the jig positioning portions 1211 are positioning pins arranged at intervals on the bottom wall of the jig bottom plate 121. The provision of the jig base 11 enables compatibility with top plate jigs 12 of various sizes, and thus with circuit boards 7 of various size specifications.

[0043] The jig bottom plate 121 is made of glass fiber material, the support 123 and the jig handle 122 are made of stainless steel material, and the support 123 and the jig handle 122 are fixed by hexagonal screws. The jig handle 122 is arranged on the top wall of the jig bottom plate 121, and at least one jig handle 122 is arranged at each lengthwise end of the jig bottom plate 121. The provision of the jig handle 122 facilitates the operator to install and dismount the top plate jig 12 through the jig handle 122.

[0044] The middle part of the length direction of the jig base 11 is provided with a base reference line 112, and the middle part of the length direction of the jig bottom plate 121 is provided with a bottom plate reference line 1212. The bottom plate reference line 1212 is aligned with the base reference line 112. For ease of observation and alignment, the bottom plate reference line 1212 is arranged on the side wall of the jig bottom plate 121, and the base reference line 112 is arranged on the top wall of the jig base 11. The provision of the base reference line 112 on the jig base 11 and the provision of the bottom plate reference line 1212 on the jig bottom plate 121 facilitate accurate positioning of the jig bottom plate 121 and ensure stable support. When the jig bottom plate 121 is placed correctly, the base reference line 112 on the jig base 11 is aligned with the bottom plate reference line 1212 on the jig bottom plate 121, otherwise the two will be misaligned, and the jig positioning portions 1211 on the jig bottom plate 121 cannot be inserted into the positioning holes 111 on the jig base 11. Therefore, the presence of the reference line can effectively avoid the risk of employees placing the jig in the wrong position, and the materials used for the jig bottom plate 121, the top pin as the support 123, the jig handle 122, the fixing screws and the positioning pins do not react with alcohol or solder paste, so the problem of short service life of the jig is also avoided.

[0045] In this embodiment, the support 123 is columnar and thin in diameter, and comprises a first support section 1231 and a second support section 1232 arranged along the axial direction of the support 123 and coaxial with each other, the diameter of the first support section 1231 is greater than that of the second support section 1232, the second support section 1232 is arranged at the top end of the first support section 1231, and the support part 1233 is located at the end of the first support section 1231 away from the second support section 1232. By designing the support 123 to be columnar and arranging two support sections with different diameters, and by arranging the second support section 1232 with a small diameter to contact the circuit board 7, the arrangement of the second support section 1232 with a small diameter can save materials, reduce weight, and reduce costs, and the small contact area of the second support section 1232 with the circuit board 7 can further prevent the support 123 from touching and damaging the elements on the circuit board 7.

[0046] Referring to Figure 6 The layout method of the support 123 on the top plate jig 12 of the utility model is based on the circuit board coordinate file 8. The existing method of placing and positioning the top pin is to use a sleeve plate with holes opened in advance to sleeve the top pin into the jig bottom plate. Since the holes on the sleeve plate are usually manually opened, there are problems such as large errors. It is also difficult to manually open holes to make the top pins uniformly distributed and maximize the stress on the bottom surface of the circuit board. The utility model uses the top plate jig design Figure 9 After the circuit board coordinate files 8 are overlapped, the position 91 of the top pin is drawn in the non-pad area. After the design is completed, the drawing is directly processed by the numerical control machine tool, the positioning is very accurate, and the error caused by the traditional manual processing of the sleeve plate is avoided.

[0047] In principle, the greater the support surface on the bottom surface of the circuit board 7, the more uniform the stress, and the more stable the printing quality. However, when evaluating the position and number of top pins, the positioning accuracy of the printing machine itself and the position deviation of the incoming pad of the circuit board 7 should be fully considered, and then sufficient avoidance distance should be reserved to avoid the top pin from touching and damaging the elements on the bottom of the circuit board 7. In combination with the overall weight and cost of the top plate jig 12, the length of the small diameter part (i.e., the second support section 1232) of the top pin is usually required to be greater than 1.5 millimeters above the highest element on the bottom surface of the circuit board 7, and the length of the second support section 1232 of the support 123 is greater than or equal to 2 millimeters. After the top plate jig 12 is designed, a stress tester is used to test the stress of the circuit board 7 during process testing. The maximum strain value of the circuit board 7 is less than or equal to 200uE, which is qualified. The smaller the absolute value of the strain value, the more stable the quality. Different standards of different enterprises are different.

[0048] As can be seen from the above, by arranging the support pieces on the jig base plate, the jig base plate can be disassembled and assembled, and the support pieces can be simultaneously mounted on or dismounted from the jig base plate, and the switching installation only needs to be inserted once, thereby reducing the number of components that need to be inserted and extracted, and greatly improving the operation efficiency, and meanwhile, the insertion and extraction structure can ensure the positioning accuracy of the support pieces and improve the connection stability. In addition, the support pieces can be designed in a needle shape, and such a structure can make the positioning top plate assembly suitable for printing of the circuit board with elements welded on the bottom surface, or the support pieces can be designed in a block shape, and such a structure can make the positioning top plate assembly suitable for printing of the circuit board without elements welded on the bottom surface. Compared with the conventional positioning jig, the positioning top plate assembly has higher positioning accuracy, smaller risk of touching and crushing elements, greater and more reasonable stress provided for the bottom surface of the circuit board, and the integrated assembly design effectively reduces the switching time of the machine type, greatly improving the production efficiency of the enterprise.

[0049] Taking a circuit board with a length of 240 mm and a width of 150 mm as an example, the positioning top plate assembly of the embodiment only needs to be inserted once when switching installation, while the old jig with pure needle insertion needs to be inserted at least 30 times, and the efficiency is improved by 97%. For tin paste printing, the stress on the bottom surface of the circuit board is an important factor. The greater the stress area and the more uniform the stress, the more stable the printing, and the better the printing quality. Taking a circuit board with a length of 240 mm and a width of 150 mm as an example, the total stress area provided by the positioning top plate assembly is 480.61 mm 2 , and the corresponding old jig is only 74.22 mm 2 , and the stress area is 6.47 times that of the original.

[0050] Positioning top plate assembly and equipment second embodiment:

[0051] As an illustration of the positioning top plate assembly and equipment second embodiment of the utility model, only the differences from the positioning top plate assembly and equipment first embodiment will be described below.

[0052] Referring to Figure 7 and Figure 8 , the top plate jig 22 in the embodiment is in the shape of a cuboid, the support part 221 is arranged on the top wall of the top plate jig 22, the jig positioning part 222 is arranged on the bottom wall of the top plate jig 22, the number of the top plate jigs 22 is multiple, each top plate jig 22 extends along the width direction of the jig base plate 21. The top plate jig 22 is also made of glass fiber material, and the positioning pin 2211 made of stainless steel material is fixed to the bottom of the top plate jig 22. The materials used will not chemically react with alcohol or tin paste, so there is no need to worry about the problem of short service life.

[0053] The middle part of the length direction of the jig base 21 is provided with a base reference line 212, and a straight line where the base reference line 212 is located passes through the center of one column of positioning holes 211 on the jig base 21, one of the top plate jigs 22 is inserted and matched with the column of positioning holes 211, and each top plate jig 22 is symmetrically arranged with the base reference line 212 as the center line, so that the base reference line 212 on the jig base 21 is arranged, the accurate positioning of the top plate jig 22 at the center position is facilitated, and the support stability is ensured.

[0054] When the top plate jig 22 of the embodiment is installed, the first top plate jig 22 is first inserted into one column of positioning holes 211 opposite to the base reference line 212, and then the other top plate jigs 22 are symmetrically inserted and placed at fixed intervals.

[0055] As can be seen from the above, each top plate jig extends along the width direction of the jig base, and the printing machine scraper is horizontally placed and moves forward and backward, that is, moves along the width direction of the jig base, so that each top plate jig extends along the width direction of the jig base, and the circuit board can be more uniformly stressed when being printed. The long strip-shaped top plate jig can make the positioning top plate assembly applicable to the printing of the circuit board without welding or elements on the bottom surface. Compared with the pure pin type jig, the top plate jig of the embodiment avoids the operation waste caused by frequent insertion and extraction of the pin, and also avoids the quality hidden danger caused by the movement and dumping of the magnetic type jig due to accidental collision, further improves the stability of the installation of the jig, and has excellent compatibility on circuit boards of different sizes.

[0056] Taking a circuit board with a length of 240mm and a width of 150mm as an example, when the positioning top plate assembly of the embodiment is switched and installed, only 11 top plate jigs need to be inserted and installed, and 30 pure pin type jigs need to be inserted and installed, so that the efficiency is improved by 63%. When the positioning top plate assembly of the embodiment is used, the total stress area provided is 10800mm 2 , which is 145.5 times that of the original.

[0057] Positioning top plate assembly and equipment third embodiment:

[0058] As a description of the third embodiment of the positioning top plate assembly and equipment of the utility model, only the differences from the second embodiment of the positioning top plate assembly and equipment will be described below.

[0059] Referring to Figure 9 , in the embodiment, two adjacent top plate jigs 32 are arranged in a staggered manner in the width direction of the jig base 31. When the size of the circuit board is large, the top plate jigs 32 can be arranged in the manner of the embodiment. The adjustment method is also very simple, that is, directly moving the odd-numbered column of top plate jigs 32.

[0060] Therefore, by arranging the top plate jigs in a staggered manner, a larger area of the circuit board can be supported, thereby improving the versatility of the positioning top plate assembly.

[0061] Fourth embodiment of the positioning top plate assembly and the device:

[0062] As an illustration of the fourth embodiment of the positioning top plate assembly and the device of the present application, only the differences from the first embodiment of the positioning top plate assembly and the device will be described below.

[0063] In this embodiment, the shape of the support member can also be a block such as a cuboid, and such a structure can make the positioning top plate assembly suitable for printing on a circuit board without welding or elements on the bottom surface.

[0064] In addition, the shape, number, size and arrangement of the support members in the first and fourth embodiments, and the top plate jigs in the second and third embodiments can be changed as needed. The above changes can also achieve the purpose of the present application.

[0065] Finally, it should be emphasized that the above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A positioning top plate assembly, comprising a jig base, wherein a plurality of positioning holes are arranged on the jig base in an array; characterized in that: the positioning top plate assembly further comprises a top plate jig, wherein the top plate jig is provided with a supporting portion and two or more jig positioning portions, the supporting portion is arranged on the top of the top plate jig, and each of the jig positioning portions is arranged on the bottom of the top plate jig; one of the jig positioning portions is inserted into one of the positioning holes, so that the top plate jig is detachably mounted on the jig base; the side of the jig base away from the top plate jig is provided with a fixing portion; the top plate jig comprises a jig bottom plate and a plurality of supporting members; each of the supporting members is fixed to the top wall of the jig bottom plate, and the supporting portion is located on the top of the supporting member; each of the jig positioning portions is located on the bottom wall of the jig bottom plate. 2.The positioning top plate assembly according to claim 1, characterized in that: both ends of the length direction of the jig bottom plate are provided with at least one of the jig positioning portions; and / or each of the supporting members is provided with the supporting portion, and each of the supporting portions is arranged in a plane. 3.The positioning top plate assembly according to claim 1, characterized in that: the top plate jig further comprises a jig handle, the jig handle is arranged on the top wall of the jig bottom plate, the number of the jig handle is two or more, and at least one of the jig handle is arranged on both ends of the length direction of the jig bottom plate; and / or the middle of the length direction of the jig base is provided with a base reference line, the middle of the length direction of the jig bottom plate is provided with a bottom plate reference line, and the bottom plate reference line is aligned with the base reference line. 4.The positioning top plate assembly according to any one of claims 1 to 3, characterized in that: the supporting member is in a columnar shape; the supporting member comprises a first supporting section and a second supporting section arranged along the axial direction of the supporting member, the diameter of the first supporting section is greater than the diameter of the second supporting section, the second supporting section is arranged on the top end of the first supporting section, and the supporting portion is located on one end of the first supporting section away from the second supporting section. 5.A positioning top plate assembly, comprising a jig base, wherein a plurality of positioning holes are arranged on the jig base in an array; characterized in that: the positioning top plate assembly further comprises a top plate jig, wherein the top plate jig is provided with a supporting portion and two or more jig positioning portions, the supporting portion is arranged on the top of the top plate jig, and each of the jig positioning portions is arranged on the bottom of the top plate jig; one of the jig positioning portions is inserted into one of the positioning holes, so that the top plate jig is detachably mounted on the jig base; the side of the jig base away from the top plate jig is provided with a fixing portion; the number of the top plate jigs is plural, and each of the top plate jigs is arranged along the length direction of the jig base; each of the top plate jigs extends along the width direction of the jig base. 6.The positioning top plate assembly according to claim 5, characterized in that: A middle part of the length direction of the jig base is provided with a base reference line, a straight line where the base reference line is located passes through the center of one column of the positioning holes, and one of the top plate jigs is inserted and matched with the column of the positioning holes.

7. The positioning top plate assembly according to claim 6, characterized in that: Each of the top plate jigs is symmetrically arranged with the base reference line as a center line.

8. The positioning top plate assembly according to any one of claims 5 to 7, characterized in that: Two adjacent top plate jigs are arranged in a staggered manner in the width direction of the jig base.

9. Apparatus characterized by The positioning top plate assembly according to any one of claims 1 to 8 is included.

10. The apparatus according to claim 9, characterized in that: The apparatus is a printing machine, and the apparatus further comprises a tin paste squeegee, a steel mesh, a workbench, a moving platform and a driving device; The jig base is mounted on the moving platform through the fixing part, and the driving device is arranged on the workbench; The steel mesh is located above the positioning top plate assembly, and the tin paste squeegee is located above the steel mesh, and the tin paste squeegee can move along the width direction of the jig base; The steel mesh and the positioning top plate assembly have a printing position therebetween, and the printing position is used for placing a circuit board; The driving device can drive the moving platform to move in a vertical direction, the moving platform can drive the positioning top plate assembly to move vertically upward, the supporting part of the positioning top plate assembly lifts up the circuit board in the printing position, and the circuit board is in contact with the steel mesh.

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