Printing press frame assembly structure and assembly method

Abstract

The printing machine frame assembly structure disclosed by the application comprises a platform, two wall plates are symmetrically arranged on the platform in a plane, a group of upper and lower supporting ledges arranged in parallel are installed between the two wall plates, the upper and lower supporting ledges are perpendicular to the wall plates, the two wall plates are both processed with plate roller holes, and the printing machine frame assembly method comprises the following steps: checking all parts to ensure the flatness of the assembly surface and lay a foundation for the assembly quality; finding the direction of the inner cavity of the frame, finding the diagonal line difference in the height direction of the frame and the diagonal line difference in the width direction of the frame; finding the coaxiality of the corresponding holes of the wall plates from three directions of the inner cavity, the height and the width; adjusting the gap between the frame and the assembly platform so that the bottom surfaces of the two wall plates are on the same horizontal plane and the stability of the frame is improved; the wall plates and the supporting ledges are positioned and installed through straight pins, and the overall assembly precision of the frame is high and the stability is strong.

Description

Technical Field

[0001] This invention belongs to the field of printing equipment assembly technology, specifically relating to the assembly structure of a printing press frame, and also to the assembly method of a printing press frame. Background Technology

[0002] The printing press frame is the fundamental component of a printing press. It typically consists of guide rollers, toothed gearboxes, doctor blades, ink delivery rollers, and other functional parts installed between two wall panels to ensure the orderly and stable operation of the printing process. As the main basic component of the printing press, the quality of its assembly directly affects the overall quality and precision retention of the machine, as well as the quality and lifespan of individual components during the printing process.

[0003] The positioning, alignment, adjustment, and fixing of the frame are particularly important during the assembly process. The traditional positioning and alignment method is to use two positioning mandrels to align a set of frames. Corresponding holes need to be inserted through the mandrels, which requires the mandrels to rotate flexibly. The mandrels are large, costly, and complex, and are difficult to insert or rotate. The overall work efficiency is low. At the same time, local deformation of the wall panel will affect the coaxiality of the hole system, resulting in errors, which makes the frame unstable and impractical. Summary of the Invention

[0004] The purpose of this invention is to provide a printing press frame assembly structure that features high assembly precision and strong stability.

[0005] Another object of the present invention is to provide a method for assembling a printing press frame.

[0006] The technical solution adopted in this invention is a printing press frame assembly structure, including a platform, on which two wall panels are symmetrically arranged on the upper surface. A set of parallel upper and lower supports are installed between the two wall panels, and both the upper and lower supports are perpendicular to the wall panels. The two wall panels are machined by boring or machining center, and both are machined with printing roller holes. The invention also includes an alignment fixture for aligning the inner cavity of the frame and a diagonal alignment device for aligning the diagonal difference of the frame.

[0007] The invention is further characterized in that,

[0008] The upper and lower support blocks are machined on the same boring and milling machine and have the same length.

[0009] Positioning pins are provided at both ends of the upper support and both ends of the lower support. Positioning pin grooves are symmetrically installed on the inner sides of the two wall panels, and the positioning pin grooves match the positioning pins.

[0010] The alignment fixture includes connecting rods a and b that are axially connected to each other. Connecting rods a and b are fastened together by a first set screw. One end of connecting rod b extends into the interior of connecting rod a. The other end of connecting rod b is connected to a first dial indicator through a first clamping head. A spherical boss is fixed to the end of connecting rod a away from connecting rod b.

[0011] The diagonal alignment device includes a first fixed base and a second fixed base. The first fixed base is an L-shaped fixed plate. Several strong magnets are embedded in the two vertical plates of the L-shaped fixed plate and in the second fixed base. Two brackets are symmetrically fixed to one outer side of the L-shaped fixed plate. A cylindrical pin parallel to the outer side of the L-shaped fixed plate is connected between the two brackets. A fisheye bearing is fitted on the cylindrical pin. One end of the fisheye bearing is connected to a lead screw through nut a. The end of the lead screw away from the fisheye bearing is connected to nut b. Nut b is fixed to a first connecting rod. A second connecting rod is fitted inside the first connecting rod. The first connecting rod and the second connecting rod are fastened together by a set screw. One end of the second connecting rod extends into the first connecting rod. The other end of the second connecting rod is connected to a second dial indicator through a clamping head.

[0012] The second mounting base includes a base plate, and a powerful magnet is embedded in the base plate by screws. A cylinder is mounted on the upper surface of the base plate, and the curved surface of the cylinder abuts against the measuring head of the second dial indicator.

[0013] Another technical solution of the present invention is to provide a printing press frame assembly method, using the above-mentioned printing press frame assembly structure, the specific steps of which are as follows:

[0014] Step 1. Inspect all parts for oil stains and scratches, and ensure that the assembly surfaces are flat;

[0015] Step 2. Use positioning pins to position and install the upper and lower supports to the two wall panels respectively. Place the side ends of the two wall panels on the platform, and place the baffle on one side of the platform so that the top surfaces of the two wall panels and the end surfaces of the platform are in contact with the same side of the baffle. Use a feeler gauge to measure and adjust the gaps between the two wall panels and the baffle and the platform respectively. After passing the adjustment, use bolts to connect the upper and lower supports to the two wall panels respectively.

[0016] Step 3. Measure and align the coaxiality of the frame's inner cavity using a six-point positioning system;

[0017] Step 4. Use the diagonal alignment device to diagonally adjust and align the frame height.

[0018] Step 5. Adjust the gap between the bottom surface of the wall panel and the assembly platform;

[0019] Step 6. Use the diagonal alignment device to perform diagonal adjustment and alignment in the width direction of the frame;

[0020] Step 7. Install the base on the bottom of each of the two wall panels and tighten all bolts.

[0021] Another feature of the present invention is that,

[0022] In step 2, the debugging requirements are: the gap between the two wall panels and the baffle and the gap between the two wall panels and the platform are both less than or equal to 0.02mm.

[0023] Step 3 is as follows: Make six positioning marks on the inner side of the two wall panels, and use a leveling fixture with a dial indicator to measure and align at the measurement points to make the coaxiality of the inner cavity of the frame less than or equal to 0.10mm.

[0024] Step 4 is as follows: Attach the first fixing seat of the diagonal alignment device to one corner of a wall panel. Install the second fixing seat at the corresponding diagonal of another wall panel located on the same horizontal plane. Move the second connecting rod to extend and retract within the first connecting rod to adjust the range. After determining the range, tighten the second connecting rod and the first connecting rod with the set screw. Shake the first connecting rod so that the measuring head of the second dial indicator at the end of the second connecting rod touches the cylinder on the second fixing seat for measurement and record the value. Then, attach the first fixing seat and the second fixing seat to the other diagonals of the two wall panels located on the same horizontal plane, measure the length data, calculate the difference in diagonal distance, and adjust until the diagonal difference in the height direction of the frame is less than or equal to 0.15mm.

[0025] Step 5 is as follows: Place the bottom surfaces of the two wall panels on the upper plane of the assembly platform, use a feeler gauge to check the parallelism between the two wall panels and the assembly platform, and adjust the parallelism to be less than or equal to 0.02mm.

[0026] Step 6 is as follows: Attach the first fixing seat of the diagonal alignment device to the corner of the side end face of one wall panel. Install the second fixing seat at the corresponding corner of the opposite side end face of another wall panel located on the same horizontal plane. Move the second connecting rod to extend and retract within the first connecting rod to adjust the range. After determining the range, tighten the second connecting rod and the first connecting rod with the set screw. Shake the first connecting rod so that the measuring head of the second dial indicator at the end of the second connecting rod touches the cylinder on the second fixing seat for measurement and record the value. Then attach the first fixing seat and the second fixing seat to the corners of the opposite side end faces of the two wall panels located on the same horizontal plane, measure the length data, and calculate the difference in diagonal distance. Repeat the above steps to measure the diagonal distance between the corners of the opposite end faces of the two wall panels located on another horizontal plane and calculate the difference. Adjust until the diagonal difference in the width direction of the frame is less than or equal to 0.10 mm.

[0027] The beneficial effects of this invention are:

[0028] The printing press frame assembly structure and method of this invention aligns the internal cavity of the frame, the diagonal difference in the height direction, and the diagonal difference in the width direction; aligns the coaxiality of corresponding holes in the wall panels from three dimensions (internal cavity, height, and width); adjusts the gap between the frame and the assembly platform to ensure that the bottom surfaces of the two wall panels are on the same horizontal plane, improving the stability of the frame; and uses direct pin positioning installation between the wall panels and supports, resulting in high overall assembly accuracy and strong stability of the frame; greatly improving work efficiency and the service life of other components. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the printing press frame assembly structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the parallelism alignment of the inner cavity of the printing press frame according to the present invention;

[0031] Figure 3 This is a schematic diagram of the parallelism alignment points of the inner cavity of the printing press frame according to the present invention;

[0032] Figure 4 This is a schematic diagram illustrating the correction of the diagonal length difference in the height direction of the printing press frame wall panel according to the present invention;

[0033] Figure 5 This is a schematic diagram illustrating the correction of the diagonal length difference in the width direction of the printing press frame wall panel according to the present invention;

[0034] Figure 6 This is a schematic diagram of the alignment tooling in the printing press frame assembly structure of the present invention;

[0035] Figure 7 This is a schematic diagram of the diagonal alignment device in the printing press frame assembly structure of the present invention.

[0036] In the diagram, 1. wall panel, 2. assembly platform panel, 3. baffle, 5. upper support, 6. lower support;

[0037] 7. Alignment fixture, 7-1. Spherical boss, 7-2. First nut, 7-3. Connecting rod a, 7-4. First set screw, 7-5. Connecting rod b, 7-6. First clamping head, 8. First dial indicator, 9. Base, 10. Diagonal alignment device, 11. First fixed seat, 12. Second fixed seat, 13. Clamping head, 14. Base plate, 15. Cylinder, 16. Strong magnet, 17. Cylindrical pin, 18. Fisheye bearing, 19. Nut a, 20. Nut b, 21. Lead screw, 22. First connecting rod, 23. Second connecting rod, 24. Set screw, 25. Second dial indicator. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] The printing press frame assembly structure of the present invention is as follows: Figure 1 and Figure 2As shown, the machine includes a platform 2, on which two wall panels 1 are symmetrically arranged. The two wall panels 1 are machined by a boring machine or a machining center, and both have printing roller holes. The two wall panels 1 on the same frame of the printing press are machined by a boring machine or a CNC machine tool, and have the same external dimensions and corresponding hole positions. A set of parallel upper supports 5 and lower supports 6 are installed between the two wall panels 1. The upper supports 5 and lower supports 6 are machined by a boring and milling machine, have the same length, and are perpendicular to the wall panels 1. Positioning pins are provided at both ends of the upper supports 5 and the lower supports 6. Positioning pin grooves are symmetrically installed on the opposite inner surfaces of the two wall panels 1, and the positioning pin grooves match the positioning pins. The machine also includes an alignment fixture 7 for aligning the inner cavity of the frame and a diagonal alignment device 10 for aligning the diagonal difference of the frame.

[0041] Example 2

[0042] Based on Example 1, such as Figure 6 As shown, the alignment fixture 7 includes a connecting rod a7-3 and a connecting rod b7-5 that are axially connected to each other. The connecting rod a7-3 and the connecting rod b7-5 are fastened together by a first set screw 7-4. One end of the connecting rod b7-5 extends into the interior of the connecting rod a7-3, and the other end of the connecting rod b7-5 is connected to a first dial indicator 8 through a first clamping head 7-6. The end of the connecting rod a7-3 away from the connecting rod b7-5 is threaded, and a first nut 7-2 is connected to the thread. The first nut 7-2 is fixedly connected to a spherical boss 7-1.

[0043] like Figure 7 As shown, the diagonal alignment device 10 includes a first fixed seat 11 and a second fixed seat 12. The first fixed seat 11 is an L-shaped fixed plate. Several strong magnets 16 are embedded in the two vertical plates of the L-shaped fixed plate and in the second fixed seat 12. Two brackets are symmetrically fixed to one outer side of the L-shaped fixed plate. A cylindrical pin 17 parallel to the outer side of the L-shaped fixed plate is connected between the two brackets. A fisheye bearing 18 is sleeved on the cylindrical pin 17. One end of the fisheye bearing 18 is connected to a lead screw 21 through a nut a19. The end of the lead screw 21 away from the fisheye bearing 18 is connected to a nut b20. A first connecting rod 22 is fixed to the nut b20. A second connecting rod 23 is sleeved inside the first connecting rod 22. The first connecting rod 22 and the second connecting rod 23 are fastened together by a set screw 24. One end of the second connecting rod 23 extends into the first connecting rod 22. The other end of the second connecting rod 23 is connected to a second dial indicator 25 through a clamping head 13.

[0044] The second fixed base 12 includes a base plate 14, and a strong magnet 16 is embedded in the base plate 14 by screws. A cylinder 15 is installed on the upper surface of the base plate 14, and the curved surface of the cylinder 15 abuts against the measuring head of the second dial indicator 25.

[0045] Example 3

[0046] The printing press frame assembly method of the present invention, using the printing press frame assembly structure of Example 2, is implemented according to the following steps:

[0047] Step 1. Check that all parts are free of oil stains and scratches, and that the assembly surfaces are flat.

[0048] Specifically, use a spirit level and a spirit level to check the flatness of assembly platform 2 and adjust it to be level. Inspect wall panel 1, upper support 5, lower support 6, and platform 2 to ensure that all parts are free of oil stains, burrs, bumps, and scratches, and to ensure that the assembly surface is flat. This lays the foundation for assembly quality.

[0049] Step 2. Connect.

[0050] like Figure 2 As shown, use positioning pins to position and install the upper support 5 and lower support 6 to the two wall panels 1 respectively. Place the side end faces of the two wall panels 1 on the platform 2, and place the baffle 3 on one side of the platform 2 so that the top surface of the two wall panels 1 and the end face of the platform 2 are in contact with the same side of the baffle 3. Use feeler gauges to measure and adjust the gaps between the two wall panels 1 and the baffle 3 and the platform 2 respectively. Adjust until the gaps between the two wall panels 1 and the baffle 3 and the gaps between the two wall panels 1 and the platform 2 are both less than or equal to 0.02mm. After passing the test, use bolts to connect the upper support 5 and lower support 6 to the two wall panels 1 respectively to form a frame.

[0051] Step 3. Measure and align the coaxiality of the frame's inner cavity using a six-point positioning system;

[0052] Six positioning marks are made on the inner sides of the two wall panels 1. The alignment fixture 7 with dial indicator 8 is used to measure and align at the measurement points so that the coaxiality of the inner cavity of the frame is less than or equal to 0.10mm.

[0053] The specific tooling for alignment 7 is as follows: Figure 3 As shown, place the spherical boss 7-1 of the inner cavity alignment fixture 7 with the first dial indicator 8 close to point A of the right wall panel 1. Touch point A of the corresponding left wall panel 1 with the first dial indicator 8, shake the indicator rod to read the data, and continue to measure the remaining five data points B, C, D, E and F of the two wall panels 1. Align a total of six data points on the inner side of the frame, calculate the difference of the dial indicator data at the six points, and adjust until the parallelism is less than or equal to 0.1 mm, so that the coaxiality of the inner cavity of the frame is less than or equal to 0.10 mm.

[0054] Step 4. Use the diagonal alignment device 10 to perform diagonal adjustment and alignment of the frame height;

[0055] like Figure 4As shown, the first fixed seat 11 of the diagonal alignment device 10 is attracted to one corner of the left wall panel 1 by a strong magnet 16, and the second fixed seat 12 is installed at the corresponding diagonal of the right wall panel 1 located on the same horizontal plane. The second connecting rod 23 is moved to extend and retract within the first connecting rod 22 to adjust the range. After the range is determined, the second connecting rod 23 and the first connecting rod 22 are tightened with the set screw 24. The first connecting rod 22 is shaken so that the measuring head of the second dial indicator 25 at the end of the second connecting rod 23 touches the cylinder 15 on the second fixed seat 12 to measure and record the value. Then, the first fixed seat 11 and the second fixed seat 12 are attracted to the other diagonals of the two wall panels 1 on the same horizontal plane, and the length data is measured. The difference in diagonal distance is calculated and adjusted until the diagonal difference in the height direction of the frame is less than or equal to 0.15mm.

[0056] Step 5. Adjust the gap between the bottom surface of wall panel 1 and assembly platform 2.

[0057] Place the two wall panels 1 on the horizontal surface of the assembly platform 2, as follows: Figure 5 As shown, the parallelism between the two wall panels 1 and the assembly platform 2 was measured to be ≤0.02mm using a feeler gauge.

[0058] Step 6. Use the diagonal alignment device 10 to perform diagonal adjustment and alignment in the width direction of the frame;

[0059] Specifically: such as Figure 5 As shown, the first fixing seat 11 of the diagonal alignment device 10 is attached to the corner of the side end face of one wall panel 1, and the second fixing seat 12 is installed at the corresponding corner of the opposite side end face of another wall panel 1 located on the same horizontal plane. The second connecting rod (23) is moved to extend and retract in the first connecting rod 22 to adjust the range. After the range is determined, the second connecting rod 23 and the first connecting rod 22 are tightened with the set screw (24). The first connecting rod 22 is shaken so that the measuring head of the second dial indicator 25 at the end of the second connecting rod 23 touches the cylinder 15 on the second fixing seat 12 to measure and record the value. Then, the first fixing seat 11 and the second fixing seat 12 are attached to the corners of the opposite side end faces of the two wall panels 1 located on the same horizontal plane, respectively. The length data is measured and the difference in diagonal distance is calculated. The above steps are repeated to measure the diagonal distance between the corners of the opposite end faces of the two wall panels 1 located on another horizontal plane and calculate the difference. The diagonal difference in the width direction of the frame is adjusted to be less than or equal to 0.10 mm.

[0060] Step 7. Install bases 9 on the bottom of the two wall panels 1 respectively, and tighten the bolts. The printing machine frame is assembled from wall panels 1, upper support 5, lower support 6, and bases 9.

[0061] Step 8. Inspection. Products that pass the inspector's inspection are considered qualified.

[0062] The working principle of the printing press frame assembly method of the present invention is as follows:

[0063] The parallelism of the frame's internal cavity, the diagonal difference in the frame's height, and the diagonal difference in the frame's width are all corrected using a pull-tab alignment method. This three-dimensional alignment of the wall panels' corresponding holes is achieved from the perspectives of the internal cavity, height, and width. The clearance between the frame and the assembly platform is adjusted to ensure that the bottom surfaces of the two wall panels are on the same horizontal plane, thus improving the frame's stability. The position between the wall panels and supports is locked using direct pin positioning, thereby ensuring the coaxiality of the corresponding holes in the two wall panels.

[0064] The advantages of the printing press frame assembly method of the present invention are: it can greatly improve work efficiency, improve the assembly accuracy of corresponding holes in the wall panels, improve the stability of the frame, and extend the service life of other components.

Claims

1. A printing press frame assembly structure, characterized in that, The system includes a platform (2), on which two wall panels (1) are symmetrically arranged. A set of parallel upper support (5) and lower support (6) are installed between the two wall panels (1), and the upper support (5) and lower support (6) are perpendicular to the wall panels (1). The two wall panels (1) are machined by boring or machining center, and both are machined with printing roller holes. The system also includes a alignment fixture (7) for aligning the inner cavity of the frame and a diagonal alignment device (10) for aligning the diagonal difference of the frame. The alignment fixture (7) includes a connecting rod a (7-3) and a connecting rod b (7-5) that are axially connected to each other. The connecting rod a (7-3) and the connecting rod b (7-5) are fastened together by a first set screw (7-4). One end of the connecting rod b (7-5) extends into the interior of the connecting rod a (7-3). The other end of the connecting rod b (7-5) is connected to a first dial indicator (8) through a first clamping head (7-6). A spherical boss (7-1) is fixed to the end of the connecting rod a (7-3) away from the connecting rod b (7-5). The diagonal alignment device (10) includes a first fixed seat (11) and a second fixed seat (12). The first fixed seat (11) is an L-shaped fixed plate. Several strong magnets (16) are embedded in the two vertical plates of the L-shaped fixed plate and in the second fixed seat (12). Two brackets are symmetrically fixed to one outer side of the L-shaped fixed plate. A cylindrical pin (17) parallel to the outer side of the L-shaped fixed plate is connected between the two brackets. A fisheye bearing (18) is fitted on the cylindrical pin (17). One end of the fisheye bearing (18) is connected by a nut a (1 9) A lead screw (21) is connected to the end of the lead screw (21) away from the fisheye bearing (18) and a nut b (20) is connected to it. The nut b (20) is fixed to a first connecting rod (22). A second connecting rod (23) is sleeved inside the first connecting rod (22). The first connecting rod (22) and the second connecting rod (23) are fastened together by a set screw (24). One end of the second connecting rod (23) extends into the first connecting rod (22). The other end of the second connecting rod (23) is connected to a second dial indicator (25) through a clamping head (13). The second fixed base (12) includes a base plate (14), the powerful magnet (16) is embedded in the base plate (14) by screws, and a cylinder (15) is installed on the upper surface of the base plate (14). The curved surface of the cylinder (15) abuts against the measuring head of the second dial indicator (25).

2. The printing press frame assembly structure according to claim 1, characterized in that, The upper support (5) and the lower support (6) are machined on the same boring and milling machine and have the same length.

3. The printing press frame assembly structure according to claim 2, characterized in that, Positioning pins are provided at both ends of the upper support (5) and both ends of the lower support (6). Positioning pin grooves are symmetrically installed on the inner sides of the two wall panels (1), and the positioning pin grooves are matched with the positioning pins.

4. A method for assembling a printing press frame, characterized in that, Using the printing press frame assembly structure as described in any one of claims 1-3, the specific steps are as follows: Step 1. Inspect all parts for oil stains and scratches, and ensure that the assembly surfaces are flat; Step 2. Use positioning pins to position and install the upper support (5) and lower support (6) to the two wall panels (1) respectively. Place the side end faces of the two wall panels (1) on the platform (2) and place the baffle (3) on one side of the platform (2) so that the top surface of the two wall panels (1) and the end face of the platform (2) are in contact with the same side of the baffle (3). Use feeler gauges to measure and adjust the gaps between the two wall panels (1) and the baffle (3) and the platform (2). After passing the test, use bolts to connect the upper support (5) and lower support (6) to the two wall panels (1) respectively. Step 3. Measure and align the coaxiality of the frame's inner cavity using a six-point positioning system; Step 4. Use the diagonal alignment device (10) to perform diagonal adjustment and alignment of the frame height; Step 5. Adjust the gap between the bottom surface of the wall panel (1) and the assembly platform (2); Step 6. Use the diagonal alignment device (10) to perform diagonal adjustment and alignment in the width direction of the frame; Step 7. Install bases (9) on the bottom of the two wall panels (1) respectively, and tighten the bolts.

5. The printing press frame assembly method according to claim 4, characterized in that, In step 2, the debugging requirements are: the gap between the two wall panels (1) and the baffle (3) and the gap between the two wall panels (1) and the platform (2) are both less than or equal to 0.02 mm.

6. The printing press frame assembly method according to claim 4, characterized in that, Step 3 specifically involves: making six-point positioning marks on the inner sides of the two wall panels (1), using a leveling fixture (7) with a first dial indicator (8) to measure and level the points, so that the coaxiality of the inner cavity of the frame is less than or equal to 0.10 mm.

7. The printing press frame assembly method according to claim 4, characterized in that, Step 4 is as follows: The first fixed seat (11) of the diagonal alignment device (10) is attached to one corner of a wall panel (1), and the second fixed seat (12) is installed at the corresponding diagonal of another wall panel (1) located on the same horizontal plane. The second connecting rod (23) is moved to extend and retract in the first connecting rod (22) to adjust the range. After the range is determined, the second connecting rod (23) and the first connecting rod (22) are tightened with the set screw (24). The first connecting rod (22) is shaken so that the measuring head of the second dial indicator (25) at the end of the second connecting rod (23) touches the cylinder (15) on the second fixed seat (12) to measure and record the value. Then the first fixed seat (11) and the second fixed seat (12) are attached to the other diagonal of the two wall panels (1) located on the same horizontal plane, respectively. The length data is measured, the difference in diagonal distance is calculated, and the diagonal difference in the height direction of the frame is adjusted to be less than or equal to 0.15mm.

8. The printing press frame assembly method according to claim 4, characterized in that, Step 5 specifically involves placing the bottom surfaces of the two wall panels (1) on the upper surface of the assembly platform (2), using a feeler gauge to check the parallelism between the two wall panels (1) and the assembly platform (2), and adjusting the parallelism to be less than or equal to 0.02 mm. Step 6 specifically involves: attaching the first fixing seat (11) of the diagonal alignment device (10) to the corner of the side end face of a wall panel (1); installing the second fixing seat (12) at the corresponding corner of the opposite side end face of another wall panel (1) located on the same horizontal plane; moving the second connecting rod (23) to adjust its range within the first connecting rod (22); after determining the range, securing the second connecting rod (23) and the first connecting rod (22) with the set screw (24); and shaking the first connecting rod (22) to adjust the range of the second connecting rod (23) at its end. The measuring head of the dial indicator (25) touches the cylinder (15) on the second fixed seat (12) to measure and record the value. Then, the first fixed seat (11) and the second fixed seat (12) are respectively attached to the corners of the opposite end faces of the two wall panels (1) on the same horizontal plane. The length data is measured and the difference in diagonal distance is calculated. The above steps are repeated to measure the diagonal distance between the corners of the opposite end faces of the two wall panels (1) on another horizontal plane and calculate the difference. The adjustment is made until the difference in the diagonal distance in the width direction of the frame is less than or equal to 0.10mm.

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