Fixture for stringer member and working method thereof

Abstract

The invention belongs to the technical field of composite material mechanical tools, and discloses a stringer component clamp and a working method thereof. Wherein a holding cylinder and a position sensor are installed on the main support, a stringer member is placed on a table top of the base and comprises a web plate and a bottom plate, the web plate is connected with the bottom plate, the bottom plate is placed on the table top, a positioning block is further installed on the table top and abuts against the two ends of the stringer member in the length direction, and the main support is installed on the two sides of the stringer member. A first telescopic rod is arranged in the holding air cylinder, a first abutting end is arranged at one end of the first telescopic rod and abuts against the web, the position sensor is electrically connected with the control circuit, and the control circuit is electrically connected with the first valve body. The problem that in the prior art, when a clamp clamps a stringer component, a machining tool interferes with the stringer component is solved.

Description

Technical Field

[0001] The invention relates to the technical field of composite material mechanical tooling, and in particular to a long stringer component clamp and a working method thereof. Background Art

[0002] As one of the most numerous machined parts in large aircraft structures, composite long stringer components have the characteristics of large aspect ratio and large number of varieties. At the same time, they need to have high consistency before and after processing. Long stringer components are mostly flexible and slender structures, which are prone to processing deformation during processing, making it difficult to ensure the processing quality and dimensional accuracy during the manufacturing process. With the development of modern aircraft manufacturing technology, the models and specifications of long stringer components have become increasingly complex and diverse. Long stringer components usually include a base plate and a web. Among them, there is a long stringer component style with a web installed on the base plate. Its cross-section is approximately T-shaped, and the web and base plate are connected at a certain angle. One side of the base plate can be a non-planar special-shaped structure. These factors make the clamping of composite long stringer components a problem.

[0003] Under the existing technology, when processing long stringer components, for example, patent CN201410635385.9 proposes a flexible clamping device for processing aircraft composite material long stringers, which adopts a multi-point clamping method and has stable clamping, but the clamping process requires manual pressing, which is time-consuming and labor-intensive. In addition, after clamping, the tool for processing the long stringer component will process the bottom plate and the web on both sides of the long stringer component, but the tool body will interfere with the clamping member on the fixture, which is easy to damage the processing tool itself and the clamping member on the fixture. Summary of the invention

[0004] The object of the present invention is to provide a long stringer member clamp and a working method thereof, so as to solve the problem that when the clamp in the prior art clamps the long stringer member, a processing tool and the long stringer member may interfere with each other.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: the present invention provides a long stringer component clamp, comprising a base, a positioning block, a position sensor, a clamping cylinder and a main bracket, the clamping cylinder and the position sensor are installed on the main bracket, a long stringer component is placed on the table top of the base, the long stringer component comprises a web and a bottom plate, the web thickness surface is connected to the bottom plate surface, the bottom plate is placed on the table top, the positioning block is also installed on the table top, the positioning block abuts against both ends of the long stringer component in the length direction, the main bracket is installed on both sides of the long stringer component, a first telescopic rod is arranged in the clamping cylinder, a first abutting end is arranged at one end of the first telescopic rod, the first abutting end abuts against the web, the position sensor is electrically connected to the control circuit, the control circuit is electrically connected to the first valve body, the clamping cylinder is divided into a first chamber and a second chamber by the first telescopic rod, the first chamber is connected to the air source through the first air path in the first valve body, and the second chamber is connected to the air source through the second air path in the first valve body;

[0006] When the position sensor detects the presence of a tool, the control circuit opens the first air circuit and closes the second air circuit, and the first telescopic rod retracts into the clamping cylinder. When the position sensor detects the disappearance of the tool, the control circuit opens the second air circuit and closes the first air circuit, and the first telescopic rod extends from the clamping cylinder.

[0007] Preferably, a floating head is installed on the first telescopic rod, and the floating head drives the first abutting end to rotate.

[0008] Preferably, a pressure sensor is installed between the first telescopic rod and the first abutting end, and the pressure sensor is electrically connected to the second valve body through the control circuit. When the first abutting end abuts against the web and the pressure of the pressure sensor is greater than 0.1N, the second valve body closes the air and locks the first telescopic rod; when the position sensor detects the approach of the tool, the control circuit controls the second valve body to ventilate, and the first telescopic rod can be telescopically moved.

[0009] Preferably, the main support is further provided with an angle cylinder, a second telescopic rod is arranged in the angle cylinder, a pressing block is installed at the upper end of the second telescopic rod, the pressing block is pressed on the upper side of the bottom plate, and the second telescopic rod moves perpendicular to the base;

[0010] The first valve body can also control the movement of the second telescopic rod. When the first telescopic rod is contracted, the second telescopic rod rises upward; when the first telescopic rod is extended, the second telescopic rod descends.

[0011] Preferably, a plug is inserted into the gap between the lower side of the bottom plate and the table top, and the pressure block is arranged at a corresponding position on the upper side of the plug.

[0012] Preferably, the pressing block, the plug block, the positioning block and the first abutting end are made of plastic.

[0013] Preferably, the positioning block includes a mounting support and a U-shaped plate, a plug-in hole is formed on the U-shaped plate, a fixing hole is formed on the web, the web is plugged into a U-shaped groove formed by the U-shaped plate, the positioning pin is plugged into the fixing hole and the plug-in hole, and the support is connected to the table top of the base by threads.

[0014] Preferably, the clamping cylinders are symmetrically installed on both sides of the long stringer member, and the first abutting ends are symmetrically distributed on both sides of the web.

[0015] Preferably, the main support and the base are connected to the machine tool workbench by threads.

[0016] A working method of a long stringer component clamp comprises the long stringer component clamp described above, and further comprises the following steps:

[0017] S1, opening positioning holes on the web, placing positioning blocks on both ends of the long stringer, fixing the long stringer with positioning pins, and fixing the positioning blocks on the table top;

[0018] S2, install a plug between the bottom plate and the table top;

[0019] S3, turn on the clamping cylinder and the angle cylinder, after the first telescopic rod is extended, when the pressure of the pressure sensor is greater than 0.1N, the first telescopic rod and the second telescopic rod stop moving, the second air valve closes, and the clamping is completed;

[0020] S4, the position sensor detects the presence of the tool, the control circuit opens the second air valve, the first telescopic rod on the main bracket where the position sensor is located retracts, and the second telescopic rod rises;

[0021] S5, the position sensor detects that the tool disappears, the first telescopic rod on the main bracket where the position sensor is located extends, the first abutting rod abuts against the web, the second telescopic rod descends, the pressing block is pressed against the bottom plate, and the control circuit closes the second air valve;

[0022] S6, repeating steps S4-S5, when the tool has finished processing both sides of the bottom plate, the control circuit opens the second air valve, and at the same time controls the first telescopic rod to retract to the side away from the web, and controls the second telescopic rod to extend upward to take out the processed long stringer component.

[0023] Beneficial effect: Through the processing method of the present invention, when the tool appears on both sides of the base plate, the position sensor will send a signal to the control circuit, and then the control circuit will control the extension and retraction of the first telescopic rod by controlling the on and off of the first gas path and the second gas path. When the tool is about to collide with the nearby first telescopic rod, the position sensor will detect the appearance of the tool and retract the first telescopic rod. After the first telescopic rod is retracted, space for the tool to move is left to avoid collision. The tool can continue to move in sequence. Whenever the position sensor detects the appearance of the tool, it will control the first telescopic rod to retract until the processing is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the clamping operation of the long stringer member clamp of the present invention (clamping state);

[0025] Figure 2 This is a schematic diagram of the clamping operation of the long stringer component of the present invention (without a tool and not clamped);

[0026] Figure 3 It is a schematic diagram of the air path of the long stringer fixture of the present invention;

[0027] Figure 4 is a cross-sectional view of a long stringer member fixture of the present invention;

[0028] Figure 5 This is a main diagram of the holding cylinder of the present invention;

[0029] Figure 6 It is the main body diagram of the corner cylinder of the present invention.

[0030] In the figure: 1-base; 11-table; 2-positioning block; 21-mounting support; 22-U-shaped plate; 23-positioning pin; 3-long girder member; 31-web; 32-bottom plate; 4-position sensor; 5-holding cylinder; 51-first telescopic rod; 52-first abutment end; 53-floating head; 54-pressure sensor; 6-main bracket; 7-tool; 8-first valve body; 9-second valve body; 10-air source; 20-angle cylinder; 201-second telescopic rod; 202-pressure block; 30-block. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Under the existing technology, when installing the clamp of the long stringer component, it is necessary to manually tighten the abutment devices on both sides. Since the long stringer component is long, multiple abutment devices are required for tightening, so it is time-consuming to install and disassemble. The cross-section of the long stringer component is usually T-shaped. When using a tool to process the bottom plate, the tool will interfere with the abutment device abutting on the side plate, resulting in the inability to perform continuous processing. The abutment device needs to be disassembled, and the processing efficiency is low.

[0036] In order to solve the above problems, Figures 1 to 6As shown, the present invention provides a long stringer component clamp, including a base 1, a positioning block 2, a position sensor 4, a clamping cylinder 5 and a main bracket 6, the clamping cylinder 5 and the position sensor 4 are installed on the main bracket 6, a long stringer component 3 is placed on the table 11 of the base 1, the long stringer component 3 includes a web 31 and a bottom plate 32, the thickness surface of the web 31 is connected to the surface of the bottom plate 32, the bottom plate 32 is placed on the table 11, and a positioning block 2 is also installed on the table 11, the positioning block 2 is abutted against both ends of the long stringer component 3 in the length direction, and the main bracket 6 is installed Installed on both sides of the long stringer member 3, a first telescopic rod 51 is arranged in the clamping cylinder 5, a first abutting end 52 is arranged at one end of the first telescopic rod 51, the first abutting end 52 abuts on the web 31, the position sensor 4 is electrically connected to the control circuit, the control circuit is electrically connected to the first valve body 8, the clamping cylinder 5 is separated into a first chamber and a second chamber by the first telescopic rod 51, the first chamber is connected to the air source 10 through the first air path in the first valve body 8, and the second chamber is connected to the air source 10 through the second air path in the first valve body 8.

[0037] The first valve body 8 of the present invention is a two-position five-way valve, so the first valve body 8 can simultaneously control the first telescopic rod 51 and the second telescopic rod 201 in the clamping cylinder 5 and the angle cylinder 20 to move synchronously.

[0038] When not being processed, after the long stringer component 3 is installed on the table 11 and fixed by the positioning blocks 2 on both sides, the first valve body 8 connects the second air path, and the air source 10 inflates the second chamber to push the first telescopic rod 51 to abut against the web 31. At the same time, the air source 10 also supplies air to the corner cylinder 20 through the first valve body 8, pushing the second telescopic rod 201 to move downward and abut against the upper side of the bottom plate 32, and fix the long stringer component 3 on the bottom plate 32 and the web 31, so as to avoid the long stringer frame from shaking when receiving the tool 7 for processing, and make the long stringer component 3 more stable during the processing of the tool 7.

[0039] Similarly, after the processing is completed, the first valve body 8 opens the first air path, and the air source 10 inflates the first chamber to push the first telescopic rod 51 away from the long stringer component 3. At the same time, the air source 10 also drives the second telescopic rod 201 to retract through the first valve body 8, so as to facilitate the removal of the long stringer component 3 from the table 11.

[0040] When the position sensor 4 detects the appearance of the tool 7, the control circuit opens the first air circuit, closes the second air circuit, and the first telescopic rod 51 retracts into the clamping cylinder 5. When the position sensor 4 detects the disappearance of the tool 7, the control circuit opens the second air circuit, closes the first air circuit, and the first telescopic rod 51 extends out along the clamping cylinder 5.

[0041] A position sensor 4 is provided on one side of each clamping cylinder 5. When the position sensor 4 detects the presence of the tool 7, it indicates that the tool 7 is close to the first telescopic rod 51 on the clamping cylinder 5. Therefore, the control circuit controls the first telescopic rod 51 to retract into the clamping cylinder 5 through the first valve body 8 to avoid position limitation between the tool 7 and the first telescopic rod 51.

[0042] A turning cylinder 20 is also installed on the main bracket 6, and a second telescopic rod 201 is arranged in the turning cylinder 20. A pressure block 202 is installed on the upper end of the second telescopic rod 201, and the pressure block 202 is crimped on the upper side of the bottom plate 32. The second telescopic rod 201 moves perpendicular to the base 1, the first telescopic rod 51 contracts, and the second telescopic rod 201 rises upward; when the first telescopic rod 51 extends, the second telescopic rod 201 descends, and the turning cylinder 20 uses the same air source 10 as the clamping cylinder 5, and is in the same air circuit control system as the first telescopic rod 51 through the first valve body 8.

[0043] Since the first cylinder body can also control the movement of the corner cylinder 20, when the first telescopic rod 51 is avoiding, the second telescopic rod 201 will also drive the pressing block 202 to rise up to avoid, and then the first telescopic rod 51 extends out to abut, and the second telescopic rod 201 will also descend to press the long stringer member 3.

[0044] In this way, the first telescopic rod 51 and the second telescopic rod 201 will automatically give way, and the tool 7 can maintain a coherent rhythm for processing without being interrupted by the interference of the first telescopic rod 51 and the second telescopic rod 201, thereby improving the processing efficiency.

[0045] The first telescopic rod 51 of the present invention is provided with a floating head 53, which drives the first abutting end 52 to rotate. Since the web 31 is not necessarily cast perpendicular to the table 11, and the first abutting end 52 is a plane, in order to make the plane of the first abutting end 52 completely fit with the web 31 to increase the contact area, the first telescopic rod 51 is stably abutted against the web 31 through the first abutting end 52, so that the long stringer member 3 can be stably fixed on the fixture, and the first abutting end 52 can be driven to rotate at a small angle by setting the floating head 53, which is similar to a universal joint, so that the first telescopic rod 51 can directly abut against the web 31, and the long stringer member 3 can be stably fixed.

[0046] A pressure sensor 54 is installed between the first telescopic rod 51 and the first abutting end 52. The pressure sensor 54 is electrically connected to the second valve body 9 through the control circuit. When the first abutting end 52 abuts against the web 31 and the pressure of the pressure sensor 54 is greater than 0.1N, the second valve body 9 closes the air to lock the first telescopic rod 51. No matter how the first valve body 8 works, the first telescopic rod 51 cannot move. When the position sensor 4 detects that the tool 7 is approaching, the control circuit controls the second valve body 9 to ventilate, and the first telescopic rod 51 can move.

[0047] The first telescopic rod 51 of the present invention can be automatically moved through the cooperation of the control circuit and the air source 10. The control circuit can be controlled according to the feedback of the pressure sensor 54 and the position sensor 4 to open or close the first valve body 8 and the second valve body 9. The movement is stopped after the pressure sensor 54 reaches a specified value, thereby preventing the long stringer component 3 from being squeezed and deformed by the first telescopic rod. At the same time, the above-mentioned installation method can save manpower, and the control circuit monitors the value of the pressure sensor 54 to confirm that the clamping is completed.

[0048] A plug 30 is inserted into the gap between the lower side of the bottom plate 32 and the table top 11, and a pressure block 202 is arranged at a corresponding position on the upper side of the plug 30. The bottom plate 32 of the long stringer member 3 is usually not in contact with the table top 11, so by adding the plug 30, the gap between the bottom plate 32 and the table top 11 can be filled to increase stability. Glue can also be applied to the plug 30 to facilitate fixing the plug 30 on the table top 11, so that the long stringer member 3 can be firmly installed on the bracket; the plug 30 has different shapes, small size, and low processing cost. Due to the different structural shapes of the long stringer frame, when replacing a long stringer frame of a different shape, the plug 30 can be replaced, and there is no need to replace the long stringer member 3 separately. A specific fixture is prepared so that all long stringer components 3 can be installed on the table 11 designed by the present invention, thereby reducing the manufacturing cost of the fixture. A plug 30 is added between the bottom plate 32 and the table 11, so that the bottom plates 32 of different shapes have sufficient connection structures with the table 11, so that the long stringer components 3 can reach a stable state. At the same time, the plug 30 is located directly below the pressure block 202. The plug 30 and the pressure block 202 are pressed against each other to fix the bottom plate 32 more firmly, and at the same time, the bottom plate 32 will not be deformed, thereby avoiding processing errors during processing by the tool 7. The pressure block 202 can rotate around the second telescopic rod 201, so that the pressure block 202 can correspond one-to-one with the plug 30 on the lower side.

[0049] In order to avoid scratching the long stringer member 3, the materials of the pressing block 202, the plug block 30, the positioning block 2 and the first abutting end 52 are replaced with a plastic structure, or a material with lower material strength than the long stringer member 3 is selected to avoid scratching the long stringer member 3 after contact with the long stringer member 3.

[0050] The positioning block 2 includes a mounting support 21 and a U-shaped plate 22. The U-shaped plate 22 is formed with a plug-in hole, and the web 31 is formed with a fixing hole. The web 31 is inserted into the U-shaped groove formed by the U-shaped plate 22. The positioning pin 23 is inserted into the fixing hole and the plug-in hole. The support is connected to the table top 11 of the base 1 by threads.

[0051] The positioning block 2 can be installed on the table top 11, and a long strip of holes is formed on the table top 11. The positioning block 2 can be fixed along the length direction and change its position along the length direction of the clamp, so that the positioning block 2 can fix the two ends of the long stringer components 3 of different lengths, so that the position of the positioning block 2 can be changed, thereby improving the stability of the long stringer components 3 on the table top 11 and preventing the long stringer components 3 from sliding back and forth along the length direction.

[0052] The clamping cylinders 5 are symmetrically installed on both sides of the long stringer component 3, and the first abutting ends 52 are symmetrically distributed on both sides of the web 31, so that the first abutting ends 52 on both sides can fix the middle web 31 without deforming the web 31 of the long stringer component 3, thereby avoiding errors caused by tool 7 processing.

[0053] The main bracket 6 and the base 1 are connected to the machine tool workbench by threads. The position of the main bracket 6 can change as the shape of the long stringer component 3 changes, so that the clamping cylinder 5 and the corner cylinder 20 on the main bracket 6 can change their positions according to the changes of the long stringer component 3, so that they can adapt to long stringer components 3 of different shapes.

[0054] The present invention also provides a working method of a long stringer member clamp, comprising the following steps:

[0055] S1, opening positioning holes on the web 31, placing the positioning blocks 2 at both ends of the long stringer member 3, and fixing the long stringer member 3 by the positioning pins 23, and fixing the positioning blocks 2 on the table 11;

[0056] S2, installing a plug 30 between the bottom plate 32 and the table top 11;

[0057] S3, the clamping cylinder 5 and the corner cylinder 20 are turned on. After the first telescopic rod 51 is extended, when the pressure of the pressure sensor 54 is greater than 0.1N, the first telescopic rod 51 and the second telescopic rod 201 stop moving, the second air valve is closed, and the clamping is completed;

[0058] S4, the position sensor 4 detects the presence of the tool 7, the control circuit opens the second air valve, the first telescopic rod 51 on the main bracket 6 where the position sensor 4 is located retracts, and the second telescopic rod 201 rises;

[0059] S5, the position sensor 4 detects that the tool 7 disappears, the first telescopic rod 51 on the main bracket 6 where the position sensor 4 is located extends, the first abutting rod abuts against the web 31, the second telescopic rod 201 descends, the pressing block 202 is pressed against the bottom plate 32, and the control circuit closes the second air valve;

[0060] S6, repeating steps S4-S5, when the tool 7 has finished processing both sides of the bottom plate 32, the control circuit opens the second air valve, and at the same time controls the first telescopic rod 51 to retract to the side away from the web 31, and controls the second telescopic rod 201 to extend upward, and takes out the processed long stringer member 3.

[0061] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A long stringer member clamp, characterized in that: The invention comprises a base (1), a positioning block (2), a position sensor (4), a clamping cylinder (5) and a main bracket (6); the clamping cylinder (5) and the position sensor (4) are installed on the main bracket (6); a long stringer component (3) is placed on the table top (11) of the base (1); the long stringer component (3) comprises a web (31) and a bottom plate (32); the thickness surface of the web (31) is connected to the surface of the bottom plate (32); the bottom plate (32) is placed on the table top (11); the positioning block (2) is also installed on the table top (11); the positioning block (2) is in contact with both ends of the long stringer component (3) in the length direction; the main bracket (6) ) are installed on both sides of the long stringer member (3), a first telescopic rod (51) is arranged in the clamping cylinder (5), one end of the first telescopic rod (51) is provided with a first abutting end (52), the first abutting end (52) abuts against the web (31), the position sensor (4) is electrically connected to the control circuit, the control circuit is electrically connected to the first valve body (8), the clamping cylinder (5) is divided into a first chamber and a second chamber by the first telescopic rod (51), the first chamber is connected to the air source (10) through a first air path in the first valve body (8), and the second chamber is connected to the air source (10) through a second air path in the first valve body (8); When the position sensor (4) detects that the tool (7) appears, the control circuit opens the first air path and closes the second air path, and the first telescopic rod (51) retracts into the clamping cylinder (5); when the position sensor (4) detects that the tool (7) disappears, the control circuit opens the second air path and closes the first air path, and the first telescopic rod (51) extends out of the clamping cylinder (5).

2. The long stringer member clamp according to claim 1, characterized in that: A floating head (53) is installed on the first telescopic rod (51), and the floating head (53) drives the first abutting end (52) to rotate.

3. The long stringer member clamp according to claim 1, characterized in that: A pressure sensor (54) is installed between the first telescopic rod (51) and the first abutting end (52). The pressure sensor (54) is electrically connected to the second valve body (9) through the control circuit. When the first abutting end (52) abuts against the web (31) and the pressure of the pressure sensor (54) is greater than 0.1N, the second valve body (9) closes the air and locks the first telescopic rod (51). When the position sensor (4) detects that the tool (7) is approaching, the control circuit controls the second valve body (9) to ventilate, and the first telescopic rod (51) can move telescopically.

4. The long stringer member clamp according to claim 3, characterized in that: The main support (6) is also equipped with an angle cylinder (20), a second telescopic rod (201) is arranged inside the angle cylinder (20), a pressing block (202) is installed at the upper end of the second telescopic rod (201), the pressing block (202) is pressed on the upper side of the bottom plate (32), and the second telescopic rod (201) moves perpendicular to the base (1); The first valve body (8) can also control the movement of the second telescopic rod (201); when the first telescopic rod (51) contracts, the second telescopic rod (201) rises; when the first telescopic rod (51) extends, the second telescopic rod (201) descends.

5. The long stringer member clamp according to claim 4, characterized in that: A plug block (30) is inserted into the gap between the lower side of the bottom plate (32) and the table top (11), and the pressing block (202) is arranged at a corresponding position on the upper side of the plug block (30).

6. The long stringer member clamp according to claim 5, characterized in that: The material of the pressing block (202), the plug block (30), the positioning block (2) and the first abutting end (52) is plastic.

7. The long stringer member clamp according to claim 5, characterized in that: The positioning block (2) comprises a mounting support (21) and a U-shaped plate (22), the U-shaped plate (22) is formed with a plug-in hole, the web (31) is formed with a fixing hole, the web (31) is plugged into a U-shaped groove formed by the U-shaped plate (22), the positioning pin (23) is plugged into the fixing hole and the plug-in hole, and the support is connected to the table (11) of the base (1) by means of threads.

8. The long stringer member clamp according to claim 7, characterized in that: The clamping cylinders (5) are symmetrically mounted on both sides of the long stringer member (3), and the first abutting ends (52) are symmetrically distributed on both sides of the web (31).

9. The long stringer member clamp according to claim 7, characterized in that: The main support (6) and the base (1) are connected to the machine tool workbench via threads.

10. A method for operating a long stringer fixture, characterized in that: The long stringer member clamp according to claim 9 further comprises the following steps: S1, opening positioning holes on the web (31), placing positioning blocks (2) on both ends of the long stringer member (3), fixing the long stringer member (3) by positioning pins (23), and fixing the positioning blocks (2) on the table top (11); S2, installing a plug (30) between the bottom plate (32) and the table top (11); S3, the clamping cylinder (5) and the turning cylinder (20) are turned on, and after the first telescopic rod (51) is extended, when the pressure of the pressure sensor (54) is greater than 0.1N, the first telescopic rod (51) and the second telescopic rod (201) stop moving, the second air valve is closed, and the clamping is completed; S4, the position sensor (4) detects the presence of the tool (7), the control circuit opens the second air valve, the first telescopic rod (51) on the main support (6) where the position sensor (4) is located retracts, and the second telescopic rod (201) rises; S5, the position sensor (4) detects that the tool (7) disappears, the first telescopic rod (51) on the main bracket (6) where the position sensor (4) is located extends, the first abutting rod abuts against the web (31), the second telescopic rod (201) descends, the pressing block (202) is pressed against the bottom plate (32), and the control circuit closes the second air valve; S6, repeating steps S4-S5, when the tool (7) has finished processing both sides of the bottom plate (32), the control circuit opens the second air valve, and at the same time controls the first telescopic rod (51) to retract to the side away from the web (31), and controls the second telescopic rod (201) to extend upward, so as to take out the processed long stringer component (3).

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