Movable net frame for providing tension for SMT steel net

Abstract

The invention relates to the technical field of surface assembly, in particular to a movable screen frame for providing tension for an SMT (Surface Mount Technology) steel mesh, which comprises a main profile, a steel mesh fixing profile, a tension adjusting mechanism, a main corner joint block and an auxiliary corner joint block, the four main sectional materials are connected through the three auxiliary corner connecting blocks and the main corner connecting block to form a rectangle in a surrounding mode, and the two steel mesh fixing sectional materials are oppositely arranged. The tension adjusting mechanism comprises a steel mesh tensioning profile, a positioning plate, a tension spring, a tension adjusting inflatable tube and a force unloading inflatable tube, the positioning plate is connected to the bottom of the main profile, the steel mesh tensioning profile is located in the main profile and rotationally connected with the main profile, and the tension adjusting inflatable tube and the force unloading inflatable tube are located on the two sides of the steel mesh tensioning profile correspondingly; the two ends of the tension spring are connected to the steel mesh tensioning profile and the positioning plate respectively. Air can be injected into the tension adjusting inflatable tube and the force unloading inflatable tube through the air inlet of the main corner joint block. The SMT steel mesh tensioning device has the effect that the tensioning force of the SMT steel mesh can be rapidly adjusted through the mesh frame.

Description

Technical Field

[0001] The present application relates to the field of surface mounting technology, and in particular to a movable mesh frame for providing tension for an SMT steel mesh. Background Art

[0002] SMT (Surface Mount Technology), also known as surface mounting or surface mounting technology, is the most popular technology and process in the current electronic assembly industry. It is a circuit assembly technology that mounts pinless or short-lead surface mounting components on the surface of a printed circuit board or other substrate, and assembles them by soldering through reflow soldering or dip soldering.

[0003] The core of SMT processing is to use a steel mesh (template) with preset mesh holes for solder paste printing. With the advocacy and development of environmental protection concepts, the steel mesh used for printing has gradually evolved from the early integrated fixed structure to a movable steel mesh that can be replaced. In the field of SMT processing, the SMT steel mesh must be stretched flat before strengthening to ensure that the steel mesh is a plane with a certain flatness during processing. In this way, in the subsequent laser processing, the height of the cutting nozzle from each point of the SMT steel mesh in the entire processing area can be basically consistent, ensuring the consistency and stability of the processing quality. In order to ensure the quality of the subsequent laser processing of the SMT steel mesh, it is necessary to first ensure that the SMT steel mesh is stretched flat before processing.

[0004] The SMT steel mesh tensioning method recorded in the related art usually adopts the gluing method in the existing SMT steel mesh manufacturing and use process. This method is specifically: placing the SMT steel mesh (generally a metal sheet, also called a steel sheet) on a mesh frame installed with a tension mesh, using an adhesive to fix the SMT steel mesh on the mesh, removing the mesh in the middle area, and releasing the tension of the mesh to the SMT steel mesh, so that the SMT steel mesh forms tension to achieve the purpose of tensioning. According to the actual situation, the tensioning force requirements of the corresponding SMT steel mesh may be different due to different processing technology, product requirements or SMT steel mesh thickness. However, due to the problem of glue curing, it is very inconvenient to adjust the tension of the SMT steel mesh, and even a new SMT steel mesh needs to be replaced. Therefore, designing a mesh frame that can adjust the tension of the SMT steel mesh is an urgent problem to be solved. Summary of the invention

[0005] In order to be able to quickly adjust the tension of the SMT steel mesh through the mesh frame to improve practicality and applicability, the present application provides a movable mesh frame for providing tension to the SMT steel mesh.

[0006] The present application provides a movable mesh frame for providing tension to the SMT steel mesh, which adopts the following technical solution: A movable mesh frame for providing tension for an SMT steel mesh, comprising a main profile, a steel mesh fixing profile, a tension adjustment mechanism, a main corner connection block and a secondary corner connection block; There are four main profiles, which are arranged in a rectangular shape, and are connected by three auxiliary corner joints and one main corner joint. There are two steel mesh fixing profiles, which are arranged opposite to each other. The tension adjustment mechanism is arranged inside the main profile between the main corner joint and the auxiliary corner joint, and one of the steel mesh fixing profiles and the tension adjustment mechanism are arranged correspondingly. The tension adjustment mechanism comprises a steel mesh tensioning profile, a positioning plate and a tension adjustment component, wherein the tension adjustment component comprises a tension spring, a tension adjustment gas expansion tube and a force unloading gas expansion tube, the positioning plate is connected to the bottom of the main profile, a groove is formed in the main profile, the steel mesh tensioning profile is inserted into the groove and is rotatably connected to the groove, one end of the steel mesh tensioning profile is formed with a connecting portion for connecting the steel mesh fixing profile, the steel mesh tensioning profile extends along the width direction of the main profile, the tension adjustment gas expansion tube and the force unloading gas expansion tube are respectively located on both sides of the steel mesh tensioning profile, and the two ends of the tension spring are respectively connected to the steel mesh tensioning profile and the positioning plate; The main connecting block is provided with an air inlet, through which compressed air can be injected into the tension regulating air expansion tube and the unloading air expansion tube.

[0007] By adopting the above technical solution, during installation, the four main profiles are assembled through three auxiliary corner blocks and one main main block, and the two ends of the steel mesh are respectively connected to the two steel mesh fixed profiles, and then the steel mesh fixed profile is connected to the connection part. When the tension of the steel mesh needs to be increased, compressed air is filled into the tension-adjusting air tube through the air inlet. After the compressed air is filled into the tension-adjusting air tube, it expands and squeezes the steel mesh tensioning profile. The steel mesh tensioning profile rotates clockwise, that is, the two steel mesh fixed profiles move toward each other, and the steel mesh is in a tensioned state. When the steel mesh needs to release the tension, compressed air is filled into the unloading air tube, the unloading air tube squeezes the steel mesh tensioning profile, and the steel mesh tensioning profile rotates counterclockwise, that is, the two steel mesh fixed profiles move relative to each other until the steel mesh is completely unloaded. In this way, by using the coordination of the tension-adjusting air tube, the unloading air tube and the steel mesh tensioning profile, the tension of the SMT steel mesh can be quickly adjusted through the mesh frame. At the same time, according to different situations, after filling with compressed air of different pressures, the tension can be adjusted, which improves practicality and applicability.

[0008] Optionally, both the steel mesh tensioning profile and the positioning plate are formed with slots, the slots are used to place spring shafts, and the two ends of the tension spring are respectively hung on the two spring shafts.

[0009] By adopting the above technical solution, the spring shaft can be clamped in the clamping slot by utilizing the clamping slot, which is convenient for fixing the tension spring.

[0010] Optionally, a straight-line distance from the connecting portion to the center of the groove is smaller than a straight-line distance from the center of the groove to one end of the steel mesh tensioning profile close to the tension-adjusting inflatable tube.

[0011] By adopting the above technical solution, the steel mesh tensioning profile as a whole forms a labor-saving lever. When a certain tension is to be achieved, the labor-saving lever is used and the pressure of the compressed air required is minimal.

[0012] Optionally, the positioning plate is detachably connected to the main profile.

[0013] By adopting the technical solution and utilizing a detachable design, assembly is facilitated.

[0014] Optionally, the steel mesh fixing profile includes a profile body, a toothed steel plate and a pressure plate, the profile body is provided with a limiting groove for the toothed steel plate to be inserted, the limiting groove is opened along the length direction of the profile body, the steel mesh can be hung on the toothed steel plate, the pressure plate can be buckled with the profile body, and the pressure plate is used to press and fix the toothed steel plate.

[0015] By adopting the above technical solution, the steel mesh is hung on the toothed steel plate, and finally pressed by the pressing plate to achieve fixed installation of the steel mesh. The toothed steel plate can be used to quickly install and remove the steel mesh, which is convenient and quick.

[0016] Optionally, an air regulating port is provided on the main connecting block, which is used to switch between the air inlet being connected to the tension regulating air expansion tube and the air inlet being connected to the unloading air expansion tube.

[0017] By adopting the above technical solution, the adjustment of input gas is facilitated and rapid switching of the entry channel is achieved.

[0018] Optionally, it also includes a lifting mechanism, which is arranged on the main angle connection block and the secondary angle connection block, and is used to drive the steel mesh fixing profile to be lifted or lowered.

[0019] By adopting the above technical solution, when the steel mesh increases tension or relieves force, a distance can be created between the steel mesh and the main profile to avoid friction.

[0020] Optionally, the lifting mechanism includes a cylinder rod, and a chamber capable of accommodating the cylinder rod is formed on the main connecting block or the auxiliary corner connecting block, and a joint connected to the cylinder rod is processed on the main connecting block or the auxiliary corner connecting block.

[0021] By adopting the above technical solution and using the cylinder rod, the lifting of the steel mesh fixed profile can be easily achieved.

[0022] Optionally, the tension adjustment assembly includes a compression spring, a tension adjustment air tube and a tension adjustment air tube, the tension adjustment air tube is located above the steel mesh tensioning profile, the two ends of the compression spring are respectively connected to the steel mesh tensioning profile and the positioning plate, the tension adjustment air tube is arranged between the positioning plate and the main profile, and compressed air can be injected into the tension adjustment air tube and the tension adjustment air tube through the air inlet.

[0023] By adopting the above technical solution, when the tension of the steel mesh needs to be increased, compressed air is filled into the tension-adjusting air tube through the air inlet. The tension-adjusting air tube expands after being filled with compressed air, squeezing the steel mesh tensioning profile, and the steel mesh tensioning profile rotates clockwise, and the steel mesh is in a tensioned state. When the steel mesh needs to release tension, the tension-adjusting air tube becomes round and expands after being filled with compressed air to lift the fixed plate, and the steel mesh tensioning profile rotates counterclockwise around the rotation point to change the tension.

[0024] Optionally, the tension adjustment assembly includes a compression spring, a torsion spring and a tension adjustment air-expanding flat tube, the torsion spring is located above the steel mesh tensioning profile, the two ends of the compression spring are respectively connected to the steel mesh tensioning profile and the positioning plate, and the tension adjustment air-expanding flat tube is arranged between the positioning plate and the main profile, and compressed air can be injected into the tension adjustment air-expanding flat tube through the air inlet.

[0025] By adopting the above technical solution, when the tension of the steel mesh needs to be increased, the steel mesh tensioning profile is squeezed by the torsion spring, and the steel mesh tensioning profile rotates clockwise, and the steel mesh is in a tensioned state. When the tension of the steel mesh needs to be relieved, the tension-adjusting air-expanding flat tube is filled with compressed air and becomes round and expands to lift the fixed plate, and the steel mesh tensioning profile rotates counterclockwise around the rotation point to change the tension.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The present application provides a movable mesh frame for providing tension for an SMT steel mesh, which includes a steel mesh tensioning profile, a main profile, a steel mesh fixing profile, a main connecting block and a secondary corner connecting block. The four main profiles are connected into a rectangle through three secondary corner connecting blocks and one main connecting block. The steel mesh tensioning profile is inserted into the main profile and can be flexibly rotated around the rotation point. A spring is connected between the steel mesh tensioning profile and the main profile, and a tension adjustment air tube and a force unloading air tube are inserted into the main profile. When the tension of the steel mesh needs to be adjusted, compressed air is filled into the tension adjustment air tube. The tension adjustment air shaft expands after being filled with compressed air, squeezing the steel mesh tensioning profile. The steel mesh tensioning profile rotates clockwise, driving the two relative steel mesh tensioning profiles to move toward each other, providing greater tension for the steel mesh. Different tensions can be provided by filling different air pressures according to the provided parameter table. When the tension of the steel mesh needs to be relieved, the compressed air is filled into the unloading air expansion tube, the unloading air expansion tube is squeezed, and the steel mesh tensioning profile rotates counterclockwise until the steel sheet is completely relieved. In this way, the tension of the SMT steel mesh can be quickly adjusted through the mesh frame, improving the practicality and applicability of the device; 2. In this application, the steel mesh fixing profile includes a profile body, a toothed steel plate and a pressure plate. The profile body is provided with a limit groove for the toothed steel plate to be inserted. The steel mesh can be hung on the toothed steel plate and finally pressed by the pressure plate to achieve fixed installation of the steel mesh. The toothed steel plate can be used to quickly install and disassemble the steel mesh, which is convenient and quick; 3. This application also provides another implementation method: under the action of the special air inflation tube for steel mesh tensioning, the steel mesh tensioning profile rotates clockwise after being filled with compressed air. A compression spring is connected between the steel mesh tensioning profile and the spring fixing plate. There is a tension-adjusting air inflation flat tube under the spring fixing plate. After the air inflation flat tube is filled with compressed air, it becomes round and expands to lift the spring fixing plate. The steel mesh tensioning profile rotates counterclockwise around the rotation point to change the tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the movable mesh frame providing tension for the SMT steel mesh in the present application; Figure 2 is a cross-sectional view of the installation structure of the main profile and the tension adjustment mechanism of the first embodiment of the present application; Figure 3 It is a structural schematic diagram of the steel mesh tensioning profile in this application; Figure 4 It is a structural schematic diagram of the positioning plate in this application; Figure 5 It is a structural diagram of the main connecting block in this application; Figure 6 It is a schematic diagram of the structure of the secondary corner block in this application; Figure 7It is a schematic diagram of the installation of the steel sheet and steel mesh fixing profile in this application; Figure 8 It is a schematic diagram of the installation structure of the steel sheet and steel mesh fixing profile in the present application after the pressure plate is hidden; Fig. 9 is a cross-sectional view of the installation structure of the main profile and the tension adjustment mechanism of the second embodiment of the present application; Fig.10 It is a cross-sectional view of the installation structure of the main profile and the tension adjustment mechanism of the third embodiment of the present application.

[0028] Explanation of the reference numerals: 1. Steel sheet; 2. Main profile; 21. Groove; 3. Steel mesh fixing profile; 31. Profile body; 32. Toothed steel plate; 33. Pressing plate; 4. Tension adjusting mechanism; 41. Steel mesh tensioning profile; 411. Rotating plate; 412. Connecting plate; 413. Hinge; 42. Positioning plate; 43. Tension adjusting assembly; 431. Tension spring; 432. Tension adjusting gas expansion tube; 433. Unloading gas expansion tube; 434. Compression spring; 435. Tension adjusting gas expansion flat tube; 436. Torsion spring; 5. Main angle connector; 6. Secondary angle connector; 7. Connecting part; 8. Slot; 9. Spring shaft; 10. Air inlet; 11. Air regulating port; 12. Lifting mechanism; 121. Cylinder rod; 122. Joint; 13. Limiting groove. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-10 This application is described in further detail.

[0030] Embodiment 1: The present application embodiment discloses a first movable mesh frame for providing tension for an SMT steel mesh, referring to Figure 1 and Figure 2 The movable mesh frame that provides tension for the SMT steel mesh includes a main profile 2, a steel mesh fixing profile 3, a tension adjustment mechanism 4, a main connecting block 5 and a secondary corner connecting block 6. There are four main profiles 2, which are arranged in a rectangular shape. The four main profiles 2 are connected by three secondary corner connecting blocks 6 and one main connecting block 5. The steel mesh fixing profile 3 is used to fix the steel mesh and is provided with two, and the two steel mesh fixing profiles 3 are respectively connected to two opposite main profiles 2. The tension adjustment mechanism 4 is arranged inside the main profile 2 between the main connecting block 5 and the secondary corner connecting block 6, and one of the steel mesh fixing profiles 3 and the tension adjustment mechanism 4 are correspondingly arranged. The tension adjustment mechanism 4 can drive the steel mesh fixing profile 3 to move horizontally.

[0031] During assembly, four main profiles 2 are connected together through three auxiliary corner joints 6 and one main main joint 5, and the two ends of the steel sheet 1 are connected to the steel mesh fixing profile 3, and then the steel mesh fixing profile 3 is connected to the tension adjustment mechanism 4. When the tension of the steel sheet 1 needs to be increased, the tension adjustment mechanism 4 is used to make the two steel mesh fixing profiles 3 move toward each other, that is, the distance between the two steel mesh fixing profiles 3 becomes larger, and the steel mesh is in a tensioned state. When the tension of the steel sheet 1 needs to be relieved, the tension adjustment mechanism 4 is used to make the two steel mesh fixing profiles 3 move relative to each other, that is, the distance between the two steel mesh fixing profiles 3 becomes smaller, until the force on the steel sheet 1 is completely relieved.

[0032] Specifically, refer to Figure 2 The tension adjustment mechanism 4 includes a steel mesh tensioning profile 41, a positioning plate 42 and a tension adjustment assembly 43, wherein the tension adjustment assembly 43 includes a tension spring 431, a tension adjustment gas expansion tube 432 and a force unloading gas expansion tube 433. The positioning plate 42 is connected to the bottom of the main profile 2, a groove 21 is formed in the main profile 2, the steel mesh tensioning profile 41 is inserted into the groove 21 and is rotatably connected to the groove 21 (the steel mesh tensioning profile 41 can rotate clockwise or counterclockwise around the hinge point). A connection portion 7 for connecting to the steel mesh fixing profile 3 is formed at one end of the steel mesh tensioning profile 41, the steel mesh tensioning profile 41 extends along the width direction of the main profile 2, the tension adjustment gas expansion tube 432 and the force unloading gas expansion tube 433 are respectively located on both sides of the steel mesh tensioning profile 41, and the two ends of the tension spring 431 are respectively connected to the steel mesh tensioning profile 41 and the positioning plate 42.

[0033] The tension adjustment method is as follows: when the tension of the steel sheet 1 needs to be increased, compressed air is filled into the tension adjustment air expansion tube 432, and the tension adjustment air expansion tube 432 expands after being filled with compressed air, squeezing the steel mesh tensioning profile 41, and the steel mesh tensioning profile 41 rotates clockwise, and the steel sheet 1 is in a tensioned state. When the tension of the steel sheet 1 needs to be relieved, compressed air is filled into the unloading air expansion tube 433, and the unloading air expansion tube 433 squeezes the steel mesh tensioning profile 41, and the steel mesh tensioning profile 41 rotates counterclockwise until the steel sheet 1 is completely relieved.

[0034] Reference Figure 2 and Figure 3The steel mesh tensioning profile 41 includes a rotating plate 411 and a connecting plate 412. The rotating plate 411 and the connecting plate 412 are integrally formed. The connecting portion 7 is located at the upper end of the rotating plate 411. The lower end of the rotating plate 411 is formed with a hinge portion 413 that can be inserted into the groove 21. In this embodiment, the position of the groove 21 is far away from the tension adjustment gas expansion tube 432. During the adjustment process, the straight-line distance from the connecting portion 7 to the center of the groove 21 (the hinge point) is less than the distance from the force application point of the tension adjustment gas expansion tube 432 on the connecting plate 412 to the center of the groove 21. In this way, the steel mesh tensioning profile 41 as a whole constitutes a labor-saving lever. When the tension to be achieved is certain, the labor-saving lever is used to minimize the pressure of the compressed air required.

[0035] Reference Figure 2 , Figure 3 and Figure 4 The steel mesh tensioning profile 41 and the positioning plate 42 are both formed with a slot 8, which is used to place the spring shaft 9, and the two ends of the tension spring 431 are respectively hung on the two spring shafts 9. By using the slot 8, the spring shaft 9 can be clamped in the slot 8, and then the tension spring 431 can be connected to the spring shaft 9, which is convenient for fixing the tension spring 431 and has high stability.

[0036] In this embodiment, the positioning plate 42 is detachably connected to the main profile 2. The detachable design facilitates assembly and disassembly, especially the installation of the spring shaft 9, and reduces the difficulty of operation.

[0037] Reference Figure 2 and Figure 5 , the main connecting block 5 is provided with an air inlet 10, through which compressed air can be injected into the tension regulating inflatable tube 432 and the unloading inflatable tube 433. Of course, the main connecting block 5 is also provided with an air regulating port 11. In this way, by using the air inlet 10 and the air regulating port 11, the switching between the connection between the air inlet 10 and the tension regulating inflatable tube 432 and the connection between the air inlet 10 and the unloading inflatable tube 433 can be realized externally. Of course, the main connecting block 5 is provided with interfaces for the tension regulating inflatable tube 432 and the unloading inflatable tube 433, and the auxiliary corner connecting block 6 is provided with plugs for the tension regulating inflatable tube 432 and the unloading inflatable tube 433, which will not be described in detail in this embodiment.

[0038] Reference Figure 5 , Figure 6 and Figure 7 The main connecting block 5 and the secondary corner connecting block 6 are also provided with a lifting mechanism 12, which is used to drive the steel mesh fixing profile 3 to move up and down. When the steel sheet 1 increases the tension or unloads the force, a gap can be left between the steel sheet 1 and the main profile 2 to avoid friction and damage to the surface of the steel sheet 1.

[0039] Specifically, the lifting mechanism 12 includes a cylinder rod 121, a cavity capable of accommodating the cylinder rod 121 is formed on the main connecting block 5 or the auxiliary corner connecting block 6, and a joint 122 connected to the cylinder rod 121 is processed on the main connecting block 5 or the auxiliary corner connecting block 6. In this way, the steel mesh fixing profile 3 can be easily lifted by using the cylinder rod 121.

[0040] Reference Figure 7 and Figure 8 In order to facilitate the fixation of the steel sheet 1, a detachable connection is adopted in this embodiment. The steel mesh fixing profile 3 includes a profile body 31, a toothed steel plate 32 and a pressing plate 33. The profile body 31 is provided with a limiting groove 13 for the toothed steel plate 32 to be inserted. The limiting groove 13 is provided along the length direction of the profile body 31. The steel sheet 1 can be hung on the toothed steel plate 32, and the pressing plate 33 can be buckled with the profile body 31. The pressing plate 33 is used to press and fix the toothed steel plate 32. The steel mesh is hung on the toothed steel plate 32, and finally pressed by the pressing plate 33 to achieve the fixed installation of the steel sheet 1. The toothed steel plate 32 can be used to quickly install and disassemble the steel sheet 1, which is convenient and quick.

[0041] Of course, the tension to be applied to the steel sheet 1 varies depending on the situation. When the compressed air is filled, a pressure gauge or other instrument can be used to detect the pressure of the compressed air. When the pressure of the compressed air is different, the tension of the steel sheet 1 is also different.

[0042] The first type of movable mesh frame for providing tension for SMT steel mesh is implemented as follows: during installation, four main profiles 2 are assembled through three auxiliary corner joints 6 and one main joint 5, and the two ends of the steel sheet 1 are hung on two toothed steel plates 32 respectively, and then the toothed steel plates 32 are inserted into the corresponding profile body 31 and pressed with a pressing plate 33. When the tension of the steel sheet 1 needs to be increased, compressed air is filled into the tension adjustment air expansion tube 432 through the air inlet 10, and the tension adjustment air expansion tube 432 expands after being filled with compressed air, squeezing the steel mesh tensioning profile 41, and the steel mesh tensioning profile 41 rotates clockwise, and the steel sheet 1 is in a tensioned state. When the tension of the steel sheet 1 needs to be relieved, compressed air is filled into the unloading air expansion tube 433, and the unloading air expansion tube 433 squeezes the steel mesh tensioning profile 41, and the steel mesh tensioning profile 41 rotates counterclockwise until the steel mesh is completely relieved. In this way, by using the coordination of the tension adjustment air tube 432, the force unloading air tube 433 and the steel mesh tensioning profile 41, the tension of the SMT steel mesh can be quickly adjusted through the mesh frame. At the same time, according to different situations, after filling with compressed air of different air pressures, the tension can be adjusted, which improves practicality and applicability.

[0043] Embodiment 2: The present application embodiment discloses a second movable mesh frame for providing tension for the SMT steel mesh, referring to Figure 1 and Fig. 9 Compared with the first movable mesh frame that provides tension for the SMT steel mesh, the difference lies in the different tension adjustment component 43.

[0044] Specifically, the tension adjustment component 43 includes a compression spring 434, a tension adjustment pneumatic tube 432 and a tension adjustment pneumatic flat tube 435. The tension adjustment pneumatic tube 432 is located above the steel mesh tensioning profile 41. The two ends of the compression spring 434 are respectively connected to the steel mesh tensioning profile 41 and the positioning plate 42. The tension adjustment pneumatic flat tube 435 is arranged between the positioning plate 42 and the main profile 2.

[0045] Of course, the compression spring 434 can also be fixed by the spring shaft 9, which is not described in detail in this embodiment. The tension adjustment inflatable flat tube 435 is filled with compressed air in the same manner as the unloading inflatable tube 433.

[0046] Compared with the first embodiment, the force-unloading air expansion tube 433 is replaced by a tension-adjusting air expansion flat tube 435. The force-bearing area of ​​the tension-adjusting air expansion flat tube 435 is larger, and the expansion of the tension-adjusting air expansion flat tube 435 drives the positioning plate 42 to move, and the force-unloading process is realized by the compression spring 434, and the force-unloading process is more stable.

[0047] The second type of active mesh frame that provides tension for the SMT steel mesh is implemented as follows: when the tension of the steel sheet 1 needs to be increased, compressed air is filled into the tension-adjusting air tube 432 through the air inlet 10, and the tension-adjusting air tube 432 expands after being filled with compressed air, squeezing the steel mesh tensioning profile 41, and the steel mesh tensioning profile 41 rotates clockwise, and the steel sheet 1 is in a tensioned state. When the tension of the steel sheet 1 needs to be relieved, the tension-adjusting air tube 435 becomes round and expands after being filled with compressed air to lift the fixed plate, and the steel mesh tensioning profile 41 rotates counterclockwise around the rotation point to change the tension.

[0048] Embodiment three: The present application embodiment discloses a third movable mesh frame for providing tension to the SMT steel mesh, referring to Figure 1 and Fig.10 Compared with the first movable mesh frame that provides tension for the SMT steel mesh, the difference lies in the different tension adjustment component 43.

[0049] Specifically, the tension adjustment assembly 43 includes a compression spring 434, a torsion spring 436 and a tension adjustment air-expanding flat tube 435. The torsion spring 436 is located above the steel mesh tensioning profile 41. The two ends of the compression spring 434 are respectively connected to the steel mesh tensioning profile 41 and the positioning plate 42. The tension adjustment air-expanding flat tube 435 is arranged between the positioning plate 42 and the main profile 2.

[0050] Compared with the second embodiment, the tension-adjusting air tube 432 is replaced with a torsion spring 436 , so that the tension-adjusting process is simpler and faster, that is, the steel mesh tensioning profile 41 can be rotated only by screwing the torsion spring 436 .

[0051] The third type of active mesh frame that provides tension for the SMT steel mesh has the following implementation principle: when the tension of the steel sheet 1 needs to be increased, the steel mesh tensioning profile 41 is squeezed by the torsion spring 436, and the steel mesh tensioning profile 41 rotates clockwise, and the steel sheet 1 is in a tensioned state. When the tension of the steel sheet 1 needs to be relieved, the tension-adjusting air-expanding flat tube 435 is filled with compressed air and becomes round and expands to lift the fixed plate, and the steel mesh tensioning profile 41 rotates counterclockwise around the rotation point to change the tension.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A movable mesh frame for providing tension for an SMT steel mesh, characterized in that: It comprises a main profile (2), a steel mesh fixing profile (3), a tension adjustment mechanism (4), a main main connecting block (5) and a secondary corner connecting block (6); There are four main profiles (2), which are arranged in a rectangular shape. The four main profiles (2) are connected via three auxiliary corner joints (6) and one main corner joint (5). There are two steel mesh fixing profiles (3), which are arranged opposite to each other. The tension adjustment mechanism (4) is arranged inside the main profile (2) between the main corner joint (5) and the auxiliary corner joint (6), and one of the steel mesh fixing profiles (3) and the tension adjustment mechanism (4) are arranged correspondingly. The tension adjustment mechanism (4) comprises a steel mesh tensioning profile (41), a positioning plate (42) and a tension adjustment component (43), wherein the tension adjustment component (43) comprises a tension spring (431), a tension adjustment air expansion tube (432) and a force unloading air expansion tube (433), the positioning plate (42) is connected to the bottom of the main profile (2), a groove (21) is formed in the main profile (2), the steel mesh tensioning profile (41) is inserted into the groove (21) and is in contact with the groove (21). 1) Rotational connection, one end of the steel mesh tensioning profile (41) is formed with a connection portion (7) for connecting to the steel mesh fixing profile (3), the steel mesh tensioning profile (41) extends along the width direction of the main profile (2), the tension adjustment air expansion tube (432) and the force unloading air expansion tube (433) are respectively located on both sides of the steel mesh tensioning profile (41), and the two ends of the tension spring (431) are respectively connected to the steel mesh tensioning profile (41) and the positioning plate (42); The main connecting block (5) is provided with an air inlet (10), through which compressed air can be injected into the tension regulating air expansion tube (432) and the unloading air expansion tube (433).

2. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: The steel mesh tensioning profile (41) and the positioning plate (42) are both formed with a slot (8), the slot (8) being used to place a spring shaft (9), and the two ends of the tension spring (431) are respectively hung on the two spring shafts (9).

3. The movable mesh frame for providing tension for the SMT steel mesh according to claim 2, characterized in that: The straight-line distance from the connecting portion (7) to the center of the groove (21) is smaller than the straight-line distance from the center of the groove (21) to one end of the steel mesh tensioning profile (41) close to the tension-adjusting inflation tube (432).

4. The movable mesh frame for providing tension for the SMT steel mesh according to claim 3, characterized in that: The positioning plate (42) is detachably connected to the main profile (2).

5. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: The steel mesh fixed profile (3) comprises a profile body (31), a toothed steel plate (32) and a pressing plate (33); the profile body (31) is provided with a limiting groove (13) into which the toothed steel plate (32) can be inserted; the limiting groove (13) is provided along the length direction of the profile body (31); the steel mesh can be hung on the toothed steel plate (32); the pressing plate (33) can be buckled with the profile body (31); and the pressing plate (33) is used to press and fix the toothed steel plate (32).

6. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: The main connecting block (5) is provided with an air regulating port (11) for switching between the air inlet (10) being connected to the tension regulating air expansion tube (432) and the air inlet (10) being connected to the unloading air expansion tube (433).

7. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: It also includes a lifting mechanism (12), which is arranged on the main corner connection block (5) and the secondary corner connection block (6), and is used to drive the steel mesh fixing profile (3) to be lifted or lowered.

8. The movable mesh frame for providing tension for the SMT steel mesh according to claim 7, characterized in that: The lifting mechanism (12) comprises a cylinder rod (121), the main connecting block (5) or the secondary corner connecting block (6) is formed with a chamber capable of accommodating the cylinder rod (121), and the main connecting block (5) or the secondary corner connecting block (6) is processed with a joint (122) connected to the cylinder rod (121).

9. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: The tension adjustment component (43) comprises a compression spring (434), a tension adjustment air expansion tube (432) and a tension adjustment air expansion flat tube (435); the tension adjustment air expansion tube (432) is located above the steel mesh tensioning profile (41); the two ends of the compression spring (434) are respectively connected to the steel mesh tensioning profile (41) and the positioning plate (42); the tension adjustment air expansion flat tube (435) is arranged between the positioning plate (42) and the main profile (2); and compressed air can be injected into the tension adjustment air expansion tube (432) and the tension adjustment air expansion flat tube (435) through the air inlet (10).

10. The movable mesh frame for providing tension for the SMT steel mesh according to claim 1, characterized in that: The tension adjustment component (43) comprises a compression spring (434), a torsion spring (436) and a tension adjustment air expansion flat tube (435); the torsion spring (436) is located above the steel mesh tensioning profile (41); the two ends of the compression spring (434) are respectively connected to the steel mesh tensioning profile (41) and the positioning plate (42); the tension adjustment air expansion flat tube (435) is arranged between the positioning plate (42) and the main profile (2); compressed air can be injected into the tension adjustment air expansion flat tube (435) through the air inlet (10).

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