A connecting rod R head positioning detection tool based on a large-stroke multi-link press

Abstract

The present application relates to the technical fields of connecting rod detection tooling, and discloses a connecting rod R head positioning and detection tooling based on a large-stroke multi-connecting rod press, which comprises a tooling frame, a positioning and detection integrated module and a detection module; a positioning shaft for positioning the tail of the connecting rod body by being inserted into a through hole in the tail of the connecting rod body is fixed to the top of the tooling frame; the positioning and detection integrated module comprises two positioning rollers and an inner detection roller capable of annular motion, the two positioning rollers are used to move through a driving unit and make the two positioning rollers abut against each other and move away from each other. The connecting rod R head positioning and detection tooling based on the large-stroke multi-connecting rod press, the inner detection roller and the positioning rollers form reverse cooperative action, when the inner detection roller expands for detection, the positioning rollers synchronously contract to avoid interference; when the inner detection roller contracts and resets, the positioning rollers synchronously abut against each other to reposition, without the need for additional adjustment of the tooling, the positioning-detection-repositioning process is continuously connected.

Description

Technical Field

[0001] The present invention relates to the technical field of connecting rod detection tooling, and specifically to a connecting rod R-head positioning detection tooling based on a large-stroke multi-link press. Background Art

[0002] In the production application of large-stroke multi-link presses, the connecting rod, as a core transmission component, the machining accuracy of its R-head (the arc-shaped transition structure at the end of the connecting rod) directly determines the stability, transmission efficiency and service life of the press. The connecting rod R-head needs to simultaneously meet the strict tolerance requirements of inner hole symmetry and outer circle roundness. The inner hole is used as the connection reference with other components. If the symmetry deviation is too large, it will cause uneven stress between components after assembly, accelerate wear and shorten the maintenance cycle of the press. The outer circle is the force-bearing contact surface during the transmission process. If the roundness does not meet the standard, it is easy to generate vibration and noise, affecting the operation accuracy of the press and even posing potential safety hazards. Therefore, the positioning detection of the connecting rod R-head is a crucial quality control link in the production chain of large-stroke multi-link presses.

[0003] Currently, in the industry for the positioning detection of connecting rod R-heads, the "step-by-step operation" mode is mostly adopted: first, the connecting rod is positioned with a single reference through simple tooling (such as positioning pins, V-blocks), and then manual hand-held detection tools (such as micrometers, dial indicators) are used to detect the inner hole symmetry and outer circle roundness respectively. This traditional method has the following significant problems: Insufficient positioning accuracy and poor reference consistency: The simple tooling can only achieve single-point positioning of the connecting rod (such as only fixing the tail or only restricting one side of the R-head), and cannot completely restrain the displacement and晃动 of the connecting rod during the detection process. Moreover, it is easy to generate deviations when manually adjusting the positioning position, resulting in inconsistent references in different detection steps, and further causing cumulative errors in the inner hole and outer circle detection data, making it difficult to meet the quality requirements of high-precision connecting rods.

[0004] Low detection efficiency and high labor cost: Step-by-step detection requires multiple adjustments of the tooling positioning state, and when manually holding the tool for detection, data needs to be collected point by point, resulting in a long single detection time. At the same time, the detection results rely on the experience judgment of the operator, there is a risk of subjective error, and special personnel need to be arranged for data review, further increasing the labor cost and production cycle, and making it difficult to adapt to the high-efficiency detection requirements of a large number of connecting rods.

[0005] With the development of large-stroke multi-link presses towards the direction of "high speed, large load, high precision", the industry's requirements for the machining accuracy of connecting rod R-heads have been further improved, and the traditional positioning detection method can no longer meet the production needs. Therefore, it is necessary to develop a positioning detection tooling that can achieve precise positioning, efficient integrated detection, and adapt to various specifications of connecting rods. Summary of the Invention

[0006] (I) Technical Problems to be Solved To address the shortcomings of existing technologies, this invention provides a connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press, which solves the problems of insufficient positioning accuracy, poor reference consistency, cumbersome operation, and reduced detection efficiency in the prior art.

[0007] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press, comprising: Tooling frame, positioning and detection integrated module, and detection module; The top of the tooling frame is fixed with a positioning shaft for inserting into the through hole at the tail of the connecting rod body to form a positioning of the tail of the connecting rod body. The integrated positioning and detection module includes two positioning rollers and an inner detection roller that can move in a ring. The two positioning rollers are used to move through the drive unit and to make the two positioning rollers close together and separate. When the close-up action is performed, the R-head of the connecting rod body is positioned and fixed. The inner detection roller is used to move through the drive unit and to make the inner detection roller contact the inner surface of the through hole of the R-head of the connecting rod body to detect the symmetry of the through hole of the R-head. The detection module includes two outer detection rollers that move along the R-head of the connecting rod body towards the tail. The two outer detection rollers are moved by a motion unit and move symmetrically from the R-head of the connecting rod body towards the tail to detect the roundness of the R-head of the connecting rod body.

[0008] Preferably, the drive unit includes a sliding frame, and two symmetrically arranged sliding seats are slidably connected inside the sliding frame, with two positioning rollers rotatably connected to the top of the two sliding seats respectively; An electric cylinder is fixed on the sliding frame, and an inclined drive rod is hinged between the power end of the electric cylinder and the two positioning rollers.

[0009] Preferably, the drive unit includes a movable frame that slides on the top of the sliding frame via a guide rail, and the movable frame is connected to the power end of an electric cylinder, and an inner detection roller is installed on the top of the movable frame; The tooling frame has a motor fixed inside for driving the rotation of the sliding frame.

[0010] Preferably, the top of the movable frame is connected to a U-shaped frame via a spring guide rod assembly, the inner detection roller is rotatably connected to the inside of the U-shaped frame, and a pressure sensor is installed at the force-bearing end of the spring guide rod assembly.

[0011] Preferably, the motion unit includes an electric telescopic rod installed inside the tooling frame, and the telescopic end of the electric telescopic rod is fixedly connected to a U-shaped transmission frame. The U-shaped transmission frame is slidably connected to the inside of the tooling frame along the length direction of the connecting rod body, and two outer detection rollers are respectively arranged on the top two sides of the U-shaped transmission frame.

[0012] Preferably, tension gauges are installed on both sides of the top of the U-shaped transmission frame; the two tension gauges are respectively connected to two external detection rollers to detect the pressure of the two external detection rollers adhering to the R-head of the connecting rod body during their movement.

[0013] Preferably, both ends of the U-shaped transmission frame are slidably connected to telescopic frames, and the two outer detection rollers are rotatably connected to the ends of the two telescopic frames through rotating seats; Both outer detection rollers are made of magnet material and are used to magnetically attach to the outer surface of the connecting rod body, with the adsorption force being greater than or equal to the maximum detection value of the tension gauge.

[0014] Preferably, the top of the tooling frame is fixedly connected to two L-shaped limiting blocks. The two L-shaped limiting blocks are used to limit the two rotating seats after the detection module has finished its detection, forming two outer detection rollers to position the entire body of the connecting rod.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press, which has the following beneficial effects: Precise control of symmetry and roundness: The inner detection roller in the integrated positioning and detection module can achieve circular motion through the drive unit, and under the action of the spring guide rod assembly, it can always maintain close contact with the inner surface of the through hole of the connecting rod R head. With the help of a pressure sensor to monitor the contact pressure in real time, if the pressure value is stable during the circular motion (or the fluctuation is within the preset error range), it can be determined that the symmetry and roundness of the inner hole are qualified, effectively identifying inner hole processing deviations, such as uneven hole diameter, center offset, and other problems.

[0016] Efficient verification of roundness and symmetry: The two outer inspection rollers of the inspection module adopt a symmetrical bonding and moving design, moving synchronously towards the tail along the outer curved surface of the connecting rod's R-head. The outer inspection rollers are magnetically attached to the connecting rod surface to ensure a tight fit; simultaneously, tension gauges on both sides of the U-shaped transmission frame can monitor the bonding pressure in real time. If the pressure fluctuation values ​​on both sides are consistent, it indicates that the outer roundness and symmetry of the R-head are qualified. This synchronous inspection method not only covers the entire curved surface of the outer circle, but also improves the reliability of the inspection results through data comparison, avoiding the limitations of single-point inspection.

[0017] Coordinated Actions: Reducing Repetitive Positioning Steps: The inner detection roller and the positioning roller coordinate in opposite directions—when the inner detection roller unfolds for detection, the positioning roller retracts synchronously to avoid interference; when the inner detection roller retracts and resets, the positioning roller simultaneously presses against the metal to reposition itself, eliminating the need for additional tooling adjustments and achieving a seamless "positioning-detection-repositioning" process. Furthermore, after completing the outer diameter detection, the detection module can directly switch to positioning mode via the L-shaped limit block, providing a continuous reference for inner hole detection, saving the time cost of separate repetitive positioning, and significantly improving overall detection efficiency.

[0018] Automated Drive: Reducing Human Intervention Errors: Both the drive unit and the motion unit are driven by automated components such as electric cylinders, electric telescopic rods, and motors. The precision of the movements is controlled by the equipment (e.g., the electric cylinder achieves symmetrical movement of the positioning roller via the drive rod, and the electric telescopic rod drives the outer detection roller to slide at a uniform speed), avoiding motion deviations caused by manual operation. Simultaneously, automated drive enables standardization of the testing process, ensuring consistency among different operators and different testing batches, and improving the repeatability of test results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the detection and positioning of the connecting rod body of the present invention; Figure 4 For the present invention Figure 3 Top view of the structure; Figure 5 For the present invention Figure 4 A magnified view of a section at point A in the middle; Figure 6 This is a schematic diagram of the telescopic frame of the present invention; Figure 7 This is a schematic diagram of the structure of the driving unit of the present invention.

[0020] In the diagram: 10. Tooling fixture; 11. Positioning shaft; 12. L-shaped limit block; 20. Integrated positioning and detection module; 21. Positioning roller; 22. Inner detection roller; 23. Drive unit; 231. Sliding frame; 232. Sliding seat; 233. Electric cylinder; 234. Drive rod; 235. Moving frame; 236. Spring guide rod assembly; 237. U-shaped frame; 238. Motor; 30. Detection module; 31. External detection roller; 32. Electric telescopic rod; 33. U-shaped transmission frame; 34. Tension gauge; 35. Telescopic frame; 40. Connecting rod body. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: See attached document Figures 1 to 7A positioning and detection fixture for the connecting rod R-head of a large-stroke multi-link press, comprising: Tooling frame 10, positioning and detection integrated module 20, and detection module 30; The top of the tooling frame 10 is fixed with a positioning shaft 11 for inserting into the through hole at the tail of the connecting rod body 40 to form a positioning of the tail of the connecting rod body 40. By setting the positioning shaft 11, it is inserted into the through hole at the tail of the connecting rod body 40, thus forming the initial positioning work of the connecting rod body 40. The positioning and detection integrated module 20 includes two positioning rollers 21 and an inner detection roller 22 that can move in a ring. The two positioning rollers 21 are used to move through the drive unit 23, and the two positioning rollers 21 are used to perform abutting action and a disengaging action. When performing the abutting action, the connecting rod body 40 R head is positioned and fixed. The inner detection roller 22 is used to move through the drive unit 23, and the inner detection roller 22 is used to contact the inner surface of the R head through hole of the connecting rod body 40, thereby detecting the symmetry of the R head through hole. The drive unit 23 drives the two positioning rollers 21 to move relative to each other. When the clamping action is performed, the R head of the connecting rod body 40 can be positioned and fixed from the inside to the outside. Combined with the positioning shaft 11 at the top of the tooling frame 10 (inserted into the through hole at the tail of the connecting rod body 40), a fast double positioning of the connecting rod body 40 under test is formed, providing a stable benchmark for subsequent testing. The electric cylinder 233 in the drive unit 23 is connected to an external power source and control switch (using existing mature connection and control methods). Its extension and retraction will drive the two inclined drive rods 234 to make symmetrical fan-shaped movements, thereby driving the two sliding seats 232 to make synchronous symmetrical sliding within the sliding frame 231, ultimately realizing the "clamping-separation" action switching of the positioning roller 21, ensuring smooth operation and positioning accuracy. The core function of the inner detection roller 22 is to detect the symmetry and roundness of the through hole of the connecting rod R-head. Its movement is coordinated with the positioning roller 21 in the opposite direction—when the inner detection roller 22 performs the unfolding detection action, the positioning roller 21 retracts synchronously to avoid interference with the detection trajectory; when the inner detection roller 22 retracts and resets, the positioning roller 21 unfolds synchronously and re-clamps and positions itself, ensuring the continuity of detection and positioning. The detection module 30 includes two outer detection rollers 31 that move along the R-head of the connecting rod body 40 towards the tail. The two outer detection rollers 31 are used to move through the motion unit and move symmetrically from the R-head of the connecting rod body 40 towards the tail to form the detection of the roundness of the R-head of the connecting rod body 40. By driving two outer detection rollers 31 to perform a symmetrical, contacting motion along the connecting rod R-head via a motion unit, the detection efficiency of the connecting rod R-head is improved. Furthermore, by comparing two sets of data, the diversity of detection is enhanced. After detecting the outer circle of the connecting rod R-head, the detection module 30 can work with the L-shaped limit block 12 to simultaneously clamp the entire body of the connecting rod 40. With the positioning shaft 11, the positioning effect of the connecting rod 40 after one round of detection can be guaranteed. This ensures the stability and accuracy of the connecting rod R-head inner hole detection performed by the positioning and detection integrated module 20.

[0023] Based on the above, such as Figure 5 and Figure 7 As shown, the drive unit 23 includes a sliding frame 231, and two symmetrical sliding seats 232 are slidably connected inside the sliding frame 231. Two positioning rollers 21 are rotatably connected to the top of the two sliding seats 232 respectively. Two positioning rollers 21 are respectively mounted on the top of the sliding seat 232 by a rotating connection. The sliding seat 232 adopts a symmetrical sliding structure, which can effectively reduce the offset of the positioning rollers 21 during movement, improve the clamping stability when clamping, and avoid affecting the positioning reference of the connecting rod R head due to structural shaking.

[0024] An electric cylinder 233 is fixed on the sliding frame 231. An inclined drive rod 234 is hinged between the power end of the electric cylinder 233 and the two positioning rollers 21. The electric cylinder 233 is connected to an external power source and control switch, and is set up using existing connection and control methods. It is used to drive two inclined drive rods 234 to perform symmetrical fan-shaped movements, thereby forming the relative contraction action and separation and clamping work of the two positioning rollers 21.

[0025] Based on the above, such as Figure 5 and Figure 7 As shown, the drive unit 23 includes a movable frame 235 that slides on the top of the sliding frame 231 via a guide rail, and the movable frame 235 is connected to the power end of the electric cylinder 233, and the inner detection roller 22 is installed on the top of the movable frame 235. The core function of the inner detection roller 22 is to detect the symmetry and roundness of the through hole of the connecting rod R-head. Its movement is coordinated with the positioning roller 21 in the opposite direction—when the inner detection roller 22 performs the unfolding detection action, the positioning roller 21 retracts synchronously to avoid interference with the detection trajectory; when the inner detection roller 22 retracts and resets, the positioning roller 21 unfolds synchronously and re-clamps and positions itself, ensuring the continuity of detection and positioning. The tooling frame 10 has a motor 238 fixed inside for rotating the sliding frame 231; The top of the movable frame 235 is connected to the U-shaped frame 237 via the spring guide rod assembly 236. The inner detection roller 22 is rotatably connected to the inside of the U-shaped frame 237, and a pressure sensor is installed on the force-bearing end of the spring guide rod assembly 236. The motor 238 (forward and reverse rotation, speed adjustable, using existing coding and control methods) inside the tooling frame 10 can drive the entire drive unit 23 to rotate, causing the inner detection roller 22, which is in close contact with the inner hole surface of the connecting rod R head, to perform a circular motion. The accuracy of the inner hole is judged by the change in the pressure sensor value during the circular motion: if the value does not change or the change range is within the preset error range (the error range can be set according to the actual detection requirements), the symmetry and roundness of the inner hole are deemed to be qualified; if the value fluctuation exceeds the threshold, it is deemed unqualified. The top of the movable frame 235 is connected to the U-shaped frame 237 via a spring guide rod assembly 236 (composed of a compression spring and at least two guide rods). The inner detection roller 22 is rotatably mounted inside the U-shaped frame 237. The compression spring applies continuous elastic pressure to the U-shaped frame 237, ensuring that the inner detection roller 22 is always in close contact with the inner hole surface, avoiding data distortion due to contact gaps. The guide rods limit the movement trajectory of the U-shaped frame 237, preventing it from deviating and ensuring stability during the detection process.

[0026] Based on the above, such as Figure 2 , Figure 3 and Figure 6 As shown, the motion unit includes an electric telescopic rod 32 installed inside the tooling frame 10, and a U-shaped transmission frame 33 is fixedly connected to the telescopic end of the electric telescopic rod 32. The U-shaped transmission frame 33 is slidably connected to the inside of the tooling frame 10 along the length direction of the connecting rod body 40, and two outer detection rollers 31 are respectively set on the top two sides of the U-shaped transmission frame 33. The two outer detection rollers 31 in the detection module 30 are driven by the motion unit to move symmetrically along the outer curved surface of the connecting rod R head. This not only allows for the simultaneous acquisition of two sets of detection data and the improvement of the reliability of the detection results through data comparison, but also covers the entire curved surface of the outer circle of the R head, avoiding the limitations of single-point detection and improving detection efficiency. When the electric telescopic rod 32 in the motion unit (connected to an external power source and control switch, using existing coding control) extends or retracts, it drives the U-shaped transmission frame 33 to slide along the length of the connecting rod body 40, thereby synchronously driving the two outer detection rollers 31 to move along the outer circle of the R-head. The sliding trajectory of the U-shaped transmission frame 33 remains parallel to the connecting rod axis, ensuring that the movement direction of the outer detection rollers 31 is consistent with the detection reference, reducing detection errors.

[0027] Based on the above, such as Figure 3 and Figure 6As shown, tension gauges 34 are installed on both sides of the top of the U-shaped transmission frame 33; the two tension gauges 34 are respectively connected to the two outer detection rollers 31, and are used to detect the pressure of the two outer detection rollers 31 adhering to the connecting rod body 40 R head adhering and moving. Considering the needs of different testing scenarios, the tension gauge 34 can be replaced with a "sensor + spring" combination structure. Specifically, the spring applies elastic extrusion force to the outer testing roller 31 to ensure it fits snugly against the outer circle of the R-head. At the same time, the sensor monitors the pressure value of the spring in real time, and the outer roundness is judged by the pressure change trend—if the pressure is stable and the values ​​on both sides are consistent, it is qualified; if the fluctuation is abnormal, it is unqualified. This solution is suitable for scenarios with higher requirements for the accuracy of the testing data.

[0028] Compatibility of power components: Power components such as electric cylinder 233, electric telescopic rod 32, and motor 238 can all be replaced with the same type of components of different specifications according to the load requirements and stroke requirements in actual production, while keeping the installation interface and control logic unchanged. There is no need to make major modifications to the overall tooling structure, which has strong compatibility and scalability.

[0029] Based on the above, such as Figure 3 and Figure 6 As shown, telescopic frames 35 are slidably connected to both ends of the U-shaped transmission frame 33, and two outer detection rollers 31 are rotatably connected to the ends of the two telescopic frames 35 through rotating seats; both outer detection rollers 31 are made of magnetic material and are used to magnetically adsorb onto the outer surface of the connecting rod body 40, and the adsorption force is greater than or equal to the maximum detection value of the tension gauge 34. The outer inspection roller 31 is made of magnetic material. Its adsorption force on the outer surface of the connecting rod body 40 is greater than or equal to the maximum detection value of the tension gauge 34. This ensures that the roller body and the outer circular surface are tightly fitted during the inspection process, avoiding deviations in the test data due to poor fit. At the same time, the tension gauges 34 on both sides of the top of the U-shaped transmission frame 33 (using existing tension testing instruments) can monitor the bonding pressure of the outer inspection roller 31 in real time. If the fluctuation values ​​of the tension gauges 34 on both sides are equal each time, the outer roundness and symmetry of the R head are deemed to be qualified; otherwise, they are deemed unqualified.

[0030] The telescopic frame 35, which is slidably connected to both ends of the U-shaped transmission frame 33, can adaptively adjust its length according to the curvature of the outer circle of the connecting rod R head, so that the outer detection roller 31 always moves in contact with the curved surface, avoiding the roller body from detaching from the detection surface due to the undulation of the curved surface, and ensuring the continuity of the detection process and the integrity of the data.

[0031] Based on the above, such as Figures 1 to 4 As shown, two L-shaped limiting blocks 12 are fixedly connected to the top of the tooling frame 10. The two L-shaped limiting blocks 12 are used to limit the two rotating seats after the detection module 30 has finished detection, forming two outer detection rollers 31 to position the entire body of the connecting rod body 40. After the outer inspection roller 31 completes the R-head outer circle inspection (moving to the middle of the connecting rod body 40), the two L-shaped limit blocks 12 at the top of the tooling frame 10 will precisely insert into the rotating seat of the outer inspection roller 31, locking the left and right displacement of the telescopic frame 35. At this time, the two outer inspection rollers 31 and the positioning shaft 11 form a "three-point positioning", clamping the connecting rod body 40 around its entire body, providing a stable reference for the subsequent inner hole inspection of the positioning and inspection integrated module 20, eliminating the need for separate repeated positioning and greatly improving the overall inspection efficiency.

[0032] The size of the L-shaped limiting block 12 is precisely matched with the contour of the rotating seat. After insertion, it can completely restrict the lateral and longitudinal displacement of the rotating seat, prevent the outer detection roller 31 from loosening during subsequent internal detection, and ensure that the connecting rod body 40 is always in a fixed reference state, further ensuring the accuracy of the internal hole detection.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 positioning and detection fixture for the connecting rod R-head of a large-stroke multi-link press, characterized in that, include: Tooling frame (10), positioning and detection integrated module (20), and detection module (30); The top of the tooling frame (10) is fixed with a positioning shaft (11) for inserting into the through hole at the tail of the connecting rod body (40) to form a positioning of the tail of the connecting rod body (40). The positioning and detection integrated module (20) includes two positioning rollers (21) and an inner detection roller (22) that can move in a ring. The two positioning rollers (21) are used to move through the drive unit (23) and to make the two positioning rollers (21) abut and separate. When the abutting action is performed, the R head of the connecting rod body (40) is positioned and fixed. The inner detection roller (22) is used to move through the drive unit (23) and to make the inner detection roller (22) contact the inner surface of the R head through hole of the connecting rod body (40) to form the detection of the symmetry of the R head through hole. The detection module (30) includes two outer detection rollers (31) that move from the R-head to the tail of the connecting rod body (40). The two outer detection rollers (31) are used to move through the motion unit and move symmetrically from the R-head to the tail of the connecting rod body (40) to detect the roundness of the R-head of the connecting rod body (40).

2. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 1, characterized in that: The drive unit (23) includes a sliding frame (231), and two symmetrical sliding seats (232) are slidably connected inside the sliding frame (231). Two positioning rollers (21) are rotatably connected to the top of the two sliding seats (232). An electric cylinder (233) is fixed on the sliding frame (231), and an inclined drive rod (234) is hinged between the power end of the electric cylinder (233) and the two positioning rollers (21).

3. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 2, characterized in that: The drive unit (23) includes a movable frame (235) that slides on the top of the sliding frame (231) via a guide rail, and the movable frame (235) is connected to the power end of the electric cylinder (233), and the inner detection roller (22) is installed on the top of the movable frame (235); The tooling frame (10) has a motor (238) fixed inside for rotating the sliding frame (231).

4. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 3, characterized in that: The top of the movable frame (235) is connected to a U-shaped frame (237) via a spring guide rod assembly (236). The inner detection roller (22) is rotatably connected to the inside of the U-shaped frame (237), and a pressure sensor is installed at the force-bearing end of the spring guide rod assembly (236).

5. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 1, characterized in that: The motion unit includes an electric telescopic rod (32) installed inside the tooling frame (10), and the telescopic end of the electric telescopic rod (32) is fixedly connected to a U-shaped transmission frame (33). The U-shaped transmission frame (33) is slidably connected to the inside of the tooling frame (10) along the length direction of the connecting rod body (40), and two external detection rollers (31) are respectively set on the top two sides of the U-shaped transmission frame (33).

6. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 5, characterized in that: The top two sides of the U-shaped transmission frame (33) are equipped with tension gauges (34); the two tension gauges (34) are respectively connected to two external detection rollers (31) to detect the pressure of the two external detection rollers (31) adhering to the R head of the connecting rod body (40) during the movement.

7. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 6, characterized in that: Both ends of the U-shaped transmission frame (33) are slidably connected to telescopic frames (35), and the two outer detection rollers (31) are rotatably connected to the ends of the two telescopic frames (35) through rotating seats; Both outer detection rollers (31) are made of magnetic material and are magnetically adsorbed onto the outer surface of the connecting rod body (40), and the adsorption force is greater than or equal to the maximum detection value of the tension gauge (34).

8. The connecting rod R-head positioning and detection fixture based on a large-stroke multi-link press according to claim 7, characterized in that: The tooling frame (10) has two L-shaped limiting blocks (12) fixedly connected to its top. The two L-shaped limiting blocks (12) are used to limit the two rotating seats after the detection module (30) has finished its detection, forming two outer detection rollers (31) to position the connecting rod body (40) around its perimeter.

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