A large-scale forging hydraulic press pull rod force monitoring device

Abstract

The application belongs to the technical field of monitoring devices, and particularly relates to a large-scale forging hydraulic press pull rod stress monitoring device, which comprises two hoops, the outer walls of the two hoops are both fixedly connected with two fixed blocks, the fixed blocks are fixed through bolts, the hoops are fixed on the outer sides of the pull rods, the side walls of the two hoops are both fixedly connected with connecting plates, the upper side walls of the connecting plates on the lower side are fixedly connected with elastic frames, the upper side walls of the elastic frames are pasted with resistance strain gauges, and the connecting plates on the lower side are connected with the left side walls of the elastic frames through amplification assemblies. After the monitoring device is installed on the surface of the large-scale forging hydraulic press pull rod through the hoops, the connecting strength between the hoops and the pull rods can be further strengthened, and after the hoops are deviated due to vibration, the situation can be detected in time, so that the problem that the accuracy of the monitoring device is affected due to the change of the reference can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of monitoring device technology, and in particular relates to a force monitoring device for the tie rod of a large forging hydraulic press. Background Technology

[0002] Forging hydraulic presses operate under high pressure and with frequent forging. In actual production, the load conditions of high-speed forging hydraulic presses are extremely complex. Without stress monitoring and alarm devices, the only way to ensure the normal operation of the hydraulic press is to strictly adhere to operating procedures and carefully control the eccentricity. However, if these human controls fail, such as beam skew or excessive stress load, the hydraulic press may be subjected to severe eccentric loads. The bending stress of the column under eccentric loads far exceeds the tensile stress under pure central loads, placing it in an extremely unfavorable working condition. In the past, various press-type column (tie rod) stress detection systems have been developed both domestically and internationally. However, due to the harsh working environment of hydraulic presses, such as high humidity, large temperature fluctuations, and complex electromagnetic environments, general detection methods are unable to withstand such harsh conditions. Although column (tie rod) stress protection systems have been developed many times, they all fail after a short period of operation. For example, the large forging hydraulic press tie rod stress monitoring device proposed in patent publication number CN202853822U.

[0003] The monitoring device for the tie rod of a large forging hydraulic press is installed on the surface of the tie rod via a clamp. When the hydraulic press is working, the tie rod will generate high-frequency vibration due to hydraulic pulse vibration and forging impact vibration. This vibration will cause fatigue loosening of the clamp fastening bolts. The loosening of the bolts will cause the reference point for monitoring the "distance between the two clamps" to shift, resulting in the "distance change" measured by the sensor not being the actual strain of the tie rod, but a false displacement caused by the slippage of the clamp, which ultimately directly undermines the accuracy of the detection reference.

[0004] To address this issue, a force monitoring device for the tie rod of a large forging hydraulic press is proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a force monitoring device for the tie rod of a large forging hydraulic press.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a force monitoring device for a large forging hydraulic press tie rod, comprising two clamps, each clamp having two fixing blocks fixedly connected to its outer wall, the fixing blocks being fixed by bolts to secure the clamps to the outside of the tie rod; each clamp having a connecting plate fixedly connected to its side wall; an elastic frame fixedly connected to the upper side wall of the lower connecting plate; a resistance strain gauge being attached to the upper side wall of the elastic frame; and the lower connecting plate being connected to the left side wall of the elastic frame via an amplification component. The device also includes:

[0007] An adsorption component is provided on the side wall of the clamp to further improve the firmness between the clamp and the tie rod;

[0008] The detection component, located on the outer wall of the clamp, is capable of detecting the relative sliding between the clamp and the tie rod.

[0009] In the aforementioned large forging hydraulic press tie rod force monitoring device, the amplification component includes a support frame fixedly connected to the side wall of the lower connecting plate. A rocker arm is rotatably connected to the inner wall of the support frame. A connecting frame is connected to the left side wall of the elastic frame. The right end of the rocker arm is rotatably connected to the connecting frame. The same spring connects the rocker arm and the lower connecting plate. An adjusting cylinder is fixedly connected to the lower side wall of the upper connecting plate. An adjusting pin is movably inserted into the adjusting cylinder. The lower end of the adjusting pin has a spherical structure and contacts the rocker arm. The adjusting cylinder is fixed to the adjusting pin by a positioning bolt.

[0010] In the aforementioned large forging hydraulic press tie rod force monitoring device, the adsorption assembly includes an adsorption cylinder fixedly connected to the outer wall of the clamp. The adsorption cylinder has an arc-shaped structure. Multiple suction cups are fixedly connected to the rear side wall of the adsorption cylinder. The rear ends of the suction cups are located inside the clamp. A piston disc is slidably arranged inside the adsorption cylinder. Two pulling rods are fixedly connected to the upper side wall of the piston disc. The upper ends of the two pulling rods pass through the adsorption cylinder and are fixedly connected to the same pull plate. The same spring is fixedly connected between the piston disc and the adsorption cylinder.

[0011] In the aforementioned large forging hydraulic press tie rod force monitoring device, the detection component includes a detection frame fixedly connected to the outer wall of the clamp. The detection frame has an L-shaped structure, and an insertion hole is provided on the side wall of the detection frame. A horizontal pin is movably inserted into the insertion hole. A movable frame is fixedly connected to the end of the horizontal pin near the tie rod. The movable frame and the detection frame are connected by the same spring. A detection wheel is rotatably connected to the inner wall of the movable frame. A rubber ring is fixedly sleeved on the outer wall of the detection wheel. Two trigger switches are fixedly connected to the side wall of the detection wheel. A trigger rod is fixedly connected to the end of the movable frame near the trigger switches. The trigger rod has an L-shaped structure, and the end of the trigger rod away from the movable frame is located between the two trigger switches. A locking bolt is threadedly connected to the side wall of the movable frame.

[0012] In the aforementioned large forging hydraulic press tie rod force monitoring device, the side walls of the two connecting plates on opposite sides are all bolted to the same sealing frame. The side walls of the two sealing frames on opposite sides are fixedly connected to the same protective airbag cover. The upper side wall of the upper connecting plate is fixedly connected to an air extraction pipe, and a one-way valve is installed inside the air extraction pipe. A display cylinder is fixedly connected to the upper side wall of the upper connecting plate. The display cylinder and the upper connecting plate are connected through a short pipe. A piston plate is connected to the lower inner wall of the display cylinder through a spring. A display column is fixedly connected to the upper side wall of the piston plate. The upper side wall of the display cylinder has a passage matching the display column.

[0013] In the aforementioned large forging hydraulic press tie rod force monitoring device, two anti-slip rubber strips are fixedly connected to the inner wall of the clamp.

[0014] In the above-mentioned large forging hydraulic press tie rod force monitoring device, guide cylinders are fixedly connected to the outer walls of both clamps, and a horizontal plate is fixedly connected to the outer wall of the lower clamp. A guide pin matching the guide cylinder is fixedly connected to the upper side wall of the horizontal plate.

[0015] In the above-mentioned large forging hydraulic press tie rod force monitoring device, the left and right sides of the tie plate are fixedly connected with bent plates, the left and right outer walls of the adsorption cylinder are fixedly connected with limiting cylinders, the lower end of the bent plate is located inside the limiting cylinder, and the limiting cylinder is fixed to the bent plate by limiting bolts.

[0016] Compared with existing technologies, the advantages of a force monitoring device for the tie rod of a large forging hydraulic press are:

[0017] 1. By using the adsorption and detection components, the connection strength between the clamp and the rod can be further enhanced after the monitoring device is installed on the surface of the tie rod of the large forging hydraulic press through the clamp. Furthermore, the device can be detected in time when the clamp shifts due to vibration, thus avoiding the problem of the monitoring device's accuracy being affected by changes in the reference.

[0018] 2. By using the amplification component, when the tie rod undergoes a slight deformation, this change can be amplified, allowing the resistance strain gauge to more clearly perceive the amount of deformation. The slight change that might have been close to the lower limit of the resistance strain gauge is mechanically amplified and exceeds the lower limit, forming a more obvious strain signal. This reduces the detection error caused by the deformation being too small, more accurately reflects the actual stress state of the tie rod, and at the same time enhances the anti-interference ability of weak signals and reduces the impact of environmental factors on the detection.

[0019] 3. By using the set sealing frame, protective airbag cover, air extraction pipe, one-way valve, display cylinder, short pipe, piston plate, and display column, the internal resistance strain gauge can be isolated from the external environment after the monitoring device is installed, thereby avoiding the problem of external moisture and dust affecting the detection accuracy of the resistance strain gauge. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a large forging hydraulic press tie rod force monitoring device provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the magnified component in a large forging hydraulic press tie rod force monitoring device provided by the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the display cylinder in a large forging hydraulic press tie rod force monitoring device provided by the present invention;

[0023] Figure 4 This is a schematic diagram showing the positional relationship between the detection frame and the clamp in a force monitoring device for a large forging hydraulic press tie rod provided by the present invention;

[0024] Figure 5 This is a schematic diagram of the adsorption component in a force monitoring device for a large forging hydraulic press tie rod provided by the present invention;

[0025] Figure 6 This is a schematic diagram of the detection component in a large forging hydraulic press tie rod force monitoring device provided by the present invention.

[0026] In the diagram: 1. Clamp, 2. Fixing block, 3. Connecting plate, 4. Elastic frame, 5. Resistance strain gauge, 6. Amplification component, 61. Support frame, 62. Rocker, 7. Connecting frame, 8. Adjusting cylinder, 9. Adjusting pin, 10. Adsorption component, 101. Adsorption cylinder, 102. Suction cup, 11. Piston disc, 12. Pull rod, 13. Pull plate, 14. Detection component, 141. Detection frame, 142. Horizontal pin, 15. Moving frame, 16. Detection wheel, 17. Rubber ring, 18. Trigger switch, 19. Trigger rod, 20. Locking bolt, 21. Sealing frame, 22. Protective airbag cover, 23. Evacuation pipe, 24. One-way valve, 25. Display cylinder, 26. Short pipe, 27. Piston plate, 28. Display column, 29. Anti-slip rubber strip, 30. Guide cylinder, 31. Horizontal plate, 32. Guide pin, 33. Bend plate, 34. Limiting cylinder, 35. Limiting bolt. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] like Figures 1-6As shown, a force monitoring device for a large forging hydraulic press tie rod includes two clamps 1. Two anti-slip rubber strips 29 are fixedly connected to the inner wall of each clamp 1. Guide cylinders 30 are fixedly connected to the outer wall of each clamp 1. A horizontal plate 31 is fixedly connected to the outer wall of the lower clamp 1. A guide pin 32 matching the guide cylinder 30 is fixedly connected to the upper side wall of the horizontal plate 31. Two fixing blocks 2 are fixedly connected to the outer wall of each clamp 1. The fixing blocks 2 are secured by bolts, fixing the clamp 1 to the outside of the tie rod. Each clamp 1 has a connecting plate 3 fixedly connected to its side wall. An elastic frame 4 is fixedly connected to the upper side wall of the lower connecting plate 3. A resistance strain gauge 5 is attached to the upper side wall of the elastic frame 4. The lower connecting plate 3 is connected to the left side wall of the elastic frame 4 via an amplification component 6. The amplification component 6 includes a support frame 61 fixedly connected to the upper side wall of the lower connecting plate 3. A rocker arm 62 is rotatably connected to the inner wall of the support frame 61. A connecting frame 7 is connected to the left side wall of the elastic frame 4. The right end of the rocker arm 62 is rotatably connected to the connecting frame 7. The rocker arm 62 and... A single spring connects the lower connecting plates 3. An adjusting cylinder 8 is fixedly connected to the lower side wall of the upper connecting plate 3. An adjusting pin 9 is movably inserted into the adjusting cylinder 8. The lower end of the adjusting pin 9 has a spherical structure and contacts the rocker plate 62. The adjusting cylinder 8 is fixed to the adjusting pin 9 by a positioning bolt. When the pull rod undergoes a slight deformation, this change can be amplified, allowing the resistance strain gauge 5 to more clearly sense the deformation. The slight change that might have been close to the lower limit of the resistance strain gauge 5 is mechanically amplified and exceeds the lower limit, forming a more obvious strain signal. This reduces the detection error caused by the small deformation and more accurately reflects the actual stress state of the pull rod. At the same time, the strain signal sensed by the resistance strain gauge 5 is enhanced, forming a stronger electrical signal output. Compared with the weak signal without amplification, the stronger electrical signal is easier to distinguish from environmental interference noise during subsequent data acquisition and signal processing. The amplification and filtering effects of signal processing are also more significant, thereby reducing the interference of electromagnetic, temperature and other factors on the signal and improving data accuracy. This also includes:

[0029] An adsorption component 10 is disposed on the side wall of the clamp 1 to further improve the firmness between the clamp 1 and the pull rod; a detection component 14 is disposed on the outer wall of the clamp 1 to detect the relative sliding between the clamp 1 and the pull rod. The adsorption component 10 includes an adsorption cylinder 101 fixedly connected to the outer wall of the clamp 1. The adsorption cylinder 101 has an arc-shaped structure. Multiple suction cups 102 are fixedly connected to the rear side wall of the adsorption cylinder 101. The rear ends of the suction cups 102 are located inside the clamp 1. A piston disk 11 is slidably disposed inside the adsorption cylinder 101. The upper side wall of the piston disk 11 is fixedly connected to the piston disk 101. Two pull rods 12 are fixedly connected, with the upper ends of both pull rods 12 passing through the adsorption cylinder 101 and fixedly connected to the same pull plate 13. The piston disc 11 and the adsorption cylinder 101 are fixedly connected to the same spring. Bending plates 33 are fixedly connected to both sides of the pull plate 13. Limiting cylinders 34 are fixedly connected to the outer walls of both sides of the adsorption cylinder 101. The lower end of the bending plate 33 is located inside the limiting cylinder 34. The limiting cylinder 34 is fixed to the bending plate 33 by limiting bolts 35. The detection component 14 includes components fixedly connected to the outside of the clamp 1. The wall-mounted detection frame 141 has an L-shaped structure. An insertion hole is provided on the side wall of the detection frame 141, and a horizontal pin 142 is movably inserted into the insertion hole. A movable frame 15 is fixedly connected to one end of the horizontal pin 142 near the pull rod. The movable frame 15 and the detection frame 141 are connected by the same spring. A detection wheel 16 is rotatably connected to the inner wall of the movable frame 15. A rubber ring 17 is fixedly sleeved on the outer wall of the detection wheel 16. Two trigger switches 18 are fixedly connected to the side wall of the detection wheel 16. The movable frame 15 is located near one of the trigger switches 18. A trigger rod 19 is fixedly connected to the end. The trigger rod 19 has an L-shaped structure, and the end of the trigger rod 19 away from the moving frame 15 is located between two trigger switches 18. The side wall of the moving frame 15 is threaded with locking bolts 20. After the monitoring device is installed on the surface of the large forging hydraulic press tie rod through the clamp 1, the connection strength between the clamp 1 and the tie rod can be further strengthened. Furthermore, if the clamp 1 shifts due to vibration, this situation can be detected in time, avoiding the problem of affecting the accuracy of the monitoring device due to changes in the reference.

[0030] The two connecting plates 3 are bolted to the same sealing frame 21 on opposite side walls. The two sealing frames 21 are fixedly connected to the same protective airbag cover 22 on opposite side walls. The upper side wall of the upper connecting plate 3 is fixedly connected to an air extraction pipe 23. A one-way valve 24 is installed inside the air extraction pipe 23. The upper side wall of the upper connecting plate 3 is fixedly connected to a display cylinder 25. The display cylinder 25 and the upper connecting plate 3 are connected through a short pipe 26. The lower inner wall of the display cylinder 25 is connected to a piston plate 27 by a spring. The upper side wall of the piston plate 27 is fixedly connected to a display column 28. The upper side wall of the display cylinder 25 has a passage matching the display column 28. After the monitoring device is installed, the resistance strain gauge 5 inside the device can be isolated from the external environment, thereby avoiding the problem of external moisture and dust affecting the detection accuracy of the resistance strain gauge 5.

[0031] The operating principle of this invention is explained as follows: The operator places two clamps 1 onto the surface of the pull rod, adjusts the angle of the two clamps 1, and slides the two clamps 1 to maintain a distance of five centimeters between them. Simultaneously, the guide pin 32 on the surface of the lower clamp 1 passes through the guide cylinder 30 on the surface of the upper clamp 1. Then, the two clamps 1 are fixed to the surface of the pull rod using bolts and fixing blocks 2. Next, the operator manually pulls the adjusting pin 9, causing the lower end of the adjusting pin 9 to press against the upper side wall of the left end of the rocker plate 62, keeping the rocker plate 62 horizontal. Then, the adjusting pin 9 is fixed inside the adjusting cylinder 8 using the positioning bolts on the surface of the adjusting cylinder 8. Finally, the operator moves the lower clamp 1... The protective airbag cover 22, which retracts from the surface of the side connecting plate 3, is pulled up and fixed to the lower side of the upper connecting plate 3 with bolts. Then, the suction end of the external air pump is inserted into the suction pipe 23 to extract part of the gas inside the protective airbag cover 22. When the gas inside the protective airbag cover 22 decreases, the air pressure inside the protective airbag cover 22 will decrease. The gas below the piston plate 27 inside the display cylinder 25 will be extracted along with the short pipe 26, so that the air pressure below the piston plate 27 is less than the air pressure above. Under the action of the air pressure difference, the piston plate 27 will drive the display column 28 to move downward together. When the operator sees the display column 28 retract into the display cylinder 25, the air pump and the suction pipe 23 can be separated.

[0032] Next, the operator rotates the locking bolt 20 to separate the locking bolt 20 from the detection wheel 16. When the vibration generated by the subsequent pull rod during operation causes the clamp 1 to slide relative to the pull rod surface, the detection wheel 16 contacts the pull rod through the rubber ring 17. After the clamp 1 and the pull rod slide relative to each other, the detection wheel 16 will drive the trigger switch 18 to rotate, thereby causing the trigger end of the trigger switch 18 on one side to contact the trigger rod 19. The trigger switch 18 will then send an electrical signal to the external controller, thereby reminding the operator that the false detection is caused by the slippage of the clamp 1.

[0033] When the tie rod deforms due to stress, the distance between the two clamps 1 changes. For example, when the two clamps 1 move away from each other due to stress changes, the two connecting plates 3 will also move away from each other. The upper connecting plate 3 will then drive the adjusting pin 9 to move upward. The support frame 61 acts as the fulcrum for the rocker 62's rotation. Under the spring tension, the right end of the rocker 62 will rotate downward by a certain angle. The support frame 61 is placed close to the left end of the rocker 62, resulting in different lever arms on both sides of the rocker 62. When the left end of the rocker 62 moves a shorter distance, the right end of the rocker 62 will move a longer distance. The right end of 62 applies a large tension to the left end of the elastic frame 4 through the connecting frame 7, causing the elastic frame 4 and the resistance strain gauge 5 attached to the surface of the elastic frame 4 to undergo large deformation. This allows the resistance strain gauge 5 to more clearly sense the amount of deformation. The small changes that might originally be close to the lower limit of the resistance strain gauge 5 are mechanically amplified and exceed the lower limit to form a more obvious strain signal. This strain signal is accurately sensed by the external controller, thereby reducing the detection error caused by the small amount of deformation, more accurately reflecting the actual stress state of the tie rod, and enhancing the anti-interference ability of weak signals and reducing the influence of environmental factors on the detection.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A force monitoring device for a large forging hydraulic press tie rod, comprising two clamps (1), each clamp (1) having two fixing blocks (2) fixedly connected to its outer wall, the fixing blocks (2) being fixed by bolts to fix the clamps (1) to the outside of the tie rod, each clamp (1) having a connecting plate (3) fixedly connected to its side wall, the upper side wall of the lower connecting plate (3) having an elastic frame (4) fixedly connected to its upper side wall, the upper side wall of the elastic frame (4) having a resistance strain gauge (5) attached thereto, the lower connecting plate (3) being connected to the left side wall of the elastic frame (4) via an amplification component (6), characterized in that, Also includes: An adsorption component (10) is provided on the side wall of the clamp (1) to further improve the firmness between the clamp (1) and the tie rod; The detection component (14) is set on the outer wall of the clamp (1) and can detect the relative sliding of the clamp (1) and the pull rod. The amplification component (6) includes a support frame (61) fixedly connected to the upper side wall of the lower connecting plate (3). The inner wall of the support frame (61) is rotatably connected to a rocker (62). The left side wall of the elastic frame (4) is connected to a connecting frame (7). The right end of the rocker (62) is rotatably connected to the connecting frame (7). The same spring is connected between the rocker (62) and the lower connecting plate (3). An adjusting cylinder (8) is fixedly connected to the lower side wall of the upper connecting plate (3). An adjusting pin (9) is movably inserted into the adjusting cylinder (8). The lower end of the adjusting pin (9) is a spherical structure and contacts the rocker (62). The adjusting cylinder (8) is fixed to the adjusting pin (9) by a positioning bolt.

2. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 1, characterized in that, The adsorption assembly (10) includes an adsorption cylinder (101) fixedly connected to the outer wall of the clamp (1). The adsorption cylinder (101) has an arc-shaped structure. Multiple suction cups (102) are fixedly connected to the rear side wall of the adsorption cylinder (101). The rear end of the suction cups (102) is located inside the clamp (1). A piston disc (11) is slidably arranged inside the adsorption cylinder (101). Two pull rods (12) are fixedly connected to the upper side wall of the piston disc (11). The upper ends of the two pull rods (12) pass through the adsorption cylinder (101) and are fixedly connected to the same pull plate (13). The same spring is fixedly connected between the piston disc (11) and the adsorption cylinder (101).

3. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 1, characterized in that, The detection assembly (14) includes a detection frame (141) fixedly connected to the outer wall of the clamp (1). The detection frame (141) has an L-shaped structure. The side wall of the detection frame (141) has an insertion hole, and a horizontal pin (142) is movably inserted into the insertion hole. A movable frame (15) is fixedly connected to one end of the horizontal pin (142) near the pull rod. The movable frame (15) and the detection frame (141) are connected by the same spring. A detection wheel (1) is rotatably connected to the inner wall of the movable frame (15). 6) A rubber ring (17) is fixedly sleeved on the outer wall of the detection wheel (16). Two trigger switches (18) are fixedly connected to the side wall of the detection wheel (16). A trigger rod (19) is fixedly connected to the end of the moving frame (15) near the trigger switch (18). The trigger rod (19) has an L-shaped structure, and the end of the trigger rod (19) away from the moving frame (15) is located between the two trigger switches (18). A locking bolt (20) is threadedly connected to the side wall of the moving frame (15).

4. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 1, characterized in that, The two connecting plates (3) are connected to the same sealing frame (21) by bolts on their opposite side walls. The two sealing frames (21) are fixedly connected to the same protective airbag cover (22) on their opposite side walls. The upper side wall of the upper connecting plate (3) is fixedly connected to an air extraction pipe (23). The air extraction pipe (23) is equipped with a one-way valve (24). The upper side wall of the upper connecting plate (3) is fixedly connected to a display cylinder (25). The display cylinder (25) and the upper connecting plate (3) are connected by a short pipe (26). The lower inner wall of the display cylinder (25) is connected to a piston plate (27) by a spring. The upper side wall of the piston plate (27) is fixedly connected to a display column (28). The upper side wall of the display cylinder (25) has a passage that matches the display column (28).

5. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 1, characterized in that, The inner wall of the clamp (1) is fixedly connected to two anti-slip rubber strips (29).

6. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 1, characterized in that, The outer walls of both clamps (1) are fixedly connected with guide cylinders (30), and the outer wall of the lower clamp (1) is fixedly connected with a horizontal plate (31). The upper side wall of the horizontal plate (31) is fixedly connected with a guide pin (32) that matches the guide cylinder (30).

7. The force monitoring device for the tie rod of a large forging hydraulic press according to claim 2, characterized in that, The left and right sides of the pull plate (13) are fixedly connected with bending plates (33), and the left and right outer walls of the adsorption cylinder (101) are fixedly connected with limiting cylinders (34). The lower end of the bending plate (33) is located inside the limiting cylinder (34), and the limiting cylinder (34) is fixed to the bending plate (33) by limiting bolts (35).

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