Large oil press main cylinder center dynamic on-line monitoring device

Abstract

The invention discloses a large oil press master cylinder center dynamic on-line monitoring device which comprises a set of master cylinder single-side position monitoring mechanisms used for dynamically monitoring center deviation of an oil press master cylinder, a set of sliding blocks are arranged on the press master cylinder in the circumferential direction, and each master cylinder single-side position monitoring mechanism corresponds to one sliding block; the main cylinder single-side position monitoring mechanism comprises a mechanical transmission module used for sliding block contact and a magnetic displacement sensor used for monitoring displacement, and the mechanical transmission module and the magnetic displacement sensor are arranged in an associated mode. The center offset of the main cylinder of the oil press is detected in a roller contact type contact mode, the center offset of the oil press is converted into detection displacement of the magnetic displacement sensor through the crank connecting rod mechanism, the center offset of the main cylinder is calculated through conversion, and for the magnetic displacement sensor, a non-contact measurement mode is adopted, and stability and reliability are achieved.

Description

Technical Field

[0001] This invention relates to the field of dynamic balance monitoring technology for hydraulic presses, and in particular to a dynamic online monitoring device for the center of the main cylinder of a large hydraulic press. Background Technology

[0002] In the production process of a hydraulic press, the vertical movement of the master cylinder directly affects the quality of the pressed products, especially in large 9000-ton wheel forging presses. Master cylinder center misalignment directly affects the circumferential unevenness of the wheel rim height, leading to low yield, increased material weight, low production efficiency, and high production costs. Currently, there is no domestic or international technology for dynamic online monitoring of the master cylinder center. Due to the harsh rolling environment and other factors, there is no effective method for dynamic online monitoring. Defects are only detected in subsequent rolling processes, and adjustments are made to the master cylinder's level and the guide slide clearance. Therefore, it is necessary to design a dynamic online monitoring device for the master cylinder center to monitor its movement trajectory in real time and solve the problem of master cylinder center adjustment.

[0003] Existing technologies for monitoring the main cylinder of large hydraulic presses only include levelness monitoring. For example, patent CN 103697861A discloses a main cylinder with at least three sets of single-side position monitoring mechanisms on all four sides. The single-side position monitoring mechanism consists of a tube frame, a displacement sensor, a magnetic ring sleeve, and a base. The tube frame has a guide sleeve at the lower end and a through hole at the upper end, and is fixed to the upper beam with bolts. The tube frame is fitted onto the measuring rod of the displacement sensor. The magnetic ring sleeve has a magnetic ring, one end of which is fitted onto the measuring rod of the displacement sensor, and the other end is connected to the main cylinder. The base has a threaded hole at the upper end that mates with the mounting thread of the measuring rod, and a through hole at the lower end, and is fixed to the side column with bolts. The online levelness monitoring device for the main cylinder of large hydraulic presses uses a contact measurement method. Due to the offset of the main cylinder center, the magnetic ring and measuring rod of the magnetostrictive displacement sensor are easily damaged, and the gap between the measuring rod and the magnetic ring is too small or they come into contact. Furthermore, it cannot measure the offset of the main cylinder center, and has limited guidance for adjusting the clearance of the main cylinder slider. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a dynamic online monitoring device for the center of the main cylinder of a large hydraulic press, which can detect the offset of the center of the main cylinder and provide data for rapid adjustment of the center of the main cylinder.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The large hydraulic press main cylinder center dynamic online monitoring device includes a set of main cylinder single-side position monitoring mechanisms for dynamic monitoring of the main cylinder center offset. A set of sliders is provided along the circumferential direction of the main cylinder, and each main cylinder single-side position monitoring mechanism corresponds to one slider. The main cylinder single-side position monitoring mechanism includes a mechanical transmission module for slider contact and a magnetostrictive displacement sensor for monitoring displacement. The mechanical transmission module and the magnetostrictive displacement sensor are configured together.

[0006] Further or preferred: The single-sided position monitoring mechanism of the master cylinder includes a mounting base and a contact transmission module, a rotary shaft module, a crank connecting rod mechanism, a linear guide pair, and a detection module associated with the mounting base; the mounting base is installed on the side column of the press, and the contact transmission module is a roller contact module, with the roller in contact with the slider.

[0007] The contact transmission module includes a measuring rod and a roller located at the front end of the measuring rod. The roller has no sliding rolling contact with the surface of the main cylinder slider of the hydraulic press.

[0008] The rotating shaft module includes a rotating shaft, a torsion spring, and a bearing housing. The bearing housing is mounted on the mounting base, and the rotating shaft passes through the bearing housing. The rear end of the measuring rod is connected to one end of the rotating shaft. The torsion spring is fitted onto the rotating shaft, and the clamping force of the torsion spring ensures that the roller of the contact transmission module abuts against the slider of the main cylinder.

[0009] A pair of limit adjustment blocks are provided on the rotating shaft, and a torsion spring is located between the pair of limit adjustment blocks, with the end of the torsion spring connected to the limit adjustment block on the corresponding side.

[0010] The crank-connecting rod mechanism includes a crank, a connecting rod, and a sliding block; one end of the connecting rod is connected to the other end of the rotating shaft through the crank, and the other end of the connecting rod is connected to the sliding block through a ball joint; both ends of the rotating shaft are connected to the measuring rod and the crank respectively to form a rotating shaft module.

[0011] The linear guide pair includes a linear guide and a guide box; the linear guide is fixed on the mounting base, and the sliding block of the crank-connecting rod mechanism is located on the guide box, and the sliding block is connected to the detection module.

[0012] The detection module includes a magnetostrictive displacement sensor probe, a magnetic ring, a magnetic ring holder, a magnetic isolation washer, and a probe base. The magnetic ring holder has a magnetic ring on it. One end of the magnetic ring holder is fitted onto the magnetostrictive displacement sensor probe, and the other end is connected to the sliding block of the crank-connecting rod mechanism. The magnetic ring holder moves up and down with the sliding block, and the movement position of the sliding block is monitored by the magnetostrictive displacement sensor.

[0013] The magnetic ring sleeve is provided with threaded holes, and the magnetic isolation washer on the magnetic ring pad is fixed to the magnetic ring sleeve by screws; the measuring rod base is fixed on the mounting base.

[0014] The magnetostrictive displacement sensor probe of the detection module is arranged parallel to the linear guide rail of the linear guide pair and perpendicular to the rotation axis of the rotation axis module.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This monitoring system employs a combination of modular mechanical transmission design and magnetostrictive sensing technology to convert the complex offset of the main cylinder into a measurable displacement signal. It detects the center offset of the hydraulic press's main cylinder through a roller contact method, and then uses a crank-connecting rod mechanism to convert the hydraulic press's center offset into a displacement measurable by a magnetostrictive displacement sensor, achieving non-contact measurement using magnetostrictive sensing technology. This system features high precision, wear resistance, and long lifespan. 2. The design is novel, and the structure is simple and compact. The measurement is timely, accurate, and reliable, enabling real-time monitoring of the center of the main cylinder. This allows for timely detection of main cylinder tilting during the rolling process, reducing wheel eccentricity and rim surface misalignment, avoiding a large number of scraps caused by main cylinder center deviation, improving product qualification rate, enhancing product quality, and ensuring smooth production. Attached Figure Description

[0016] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings: Figure 1 This is a schematic diagram of the monitoring mechanism and the slider of the present invention.

[0017] Figures 2 to 4 This is a schematic diagram of the monitoring mechanism structure of the present invention.

[0018] In the picture: 1. Press main cylinder; 2. Slider; 3. Main cylinder single-side position monitoring mechanism; 31. Mounting base; 32. Contact transmission module; 321. Roller; 322. Measuring rod; 33. Rotary shaft module; 331. Rotary shaft; 332. Torsion spring; 333.1# limit adjustment block; 334.2# limit adjustment block; 335. Bearing seat; 34. Crank-connecting rod mechanism; 341. Crank; 342. Connecting rod; 343. Sliding block; 35. Linear guide pair; 351. Linear guide; 352. Guide box; 36. Detection module; 361. Magnetostrictive displacement sensor measuring rod; 362. Magnetic ring; 363. Magnetic ring sleeve; 364. Magnetic isolation washer; 365. Measuring rod base; 4. Side column. Detailed Implementation

[0019] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and through the description of the examples.

[0020] like Figures 1 to 4As shown, the large hydraulic press main cylinder center dynamic online monitoring device includes a set of main cylinder single-side position monitoring mechanisms for dynamic monitoring of the main cylinder center offset; a set of sliders is provided along the circumferential direction of the main cylinder, and each main cylinder single-side position monitoring mechanism corresponds to one slider; the main cylinder single-side position monitoring mechanism includes a mechanical transmission module for slider contact and a magnetostrictive displacement sensor for monitoring displacement, and the mechanical transmission module and the magnetostrictive displacement sensor are set together.

[0021] The single-sided position monitoring mechanism of the master cylinder includes a mounting base and associated contact transmission module, rotary shaft module, crank connecting rod mechanism, linear guide pair and detection module mounted on the mounting base; the mounting base is mounted on the side column of the press; the contact transmission module is a roller contact module, with the roller in contact with the slider.

[0022] This invention employs a roller contact method to detect the center offset of the hydraulic press master cylinder. The center offset is converted into displacement by a magnetostrictive displacement sensor via a crank-connecting rod mechanism. The master cylinder center offset is then calculated. This non-contact measurement method for the magnetostrictive displacement sensor is stable and reliable. Furthermore, this invention uses three sets of single-sided position monitoring mechanisms for the master cylinder, employing a three-point measurement method. By establishing a three-dimensional model of the master cylinder's vertical movement, it can not only measure the master cylinder's horizontal position but also detect its circumferential torsion, providing data for rapid adjustment of the master cylinder center.

[0023] A preferred embodiment of the present invention is as follows: This invention provides a dynamic online monitoring device for the center of the main cylinder of a large hydraulic press, which can promptly detect the tilting problem of the main cylinder during the forging process, improve the pass rate of forged products, and avoid the generation of large quantities of scrap. This dynamic online monitoring device for the center of the main cylinder of a large hydraulic press includes a main cylinder 1 and a slider 2. The slider is fixedly mounted around the main cylinder. Its key feature is that at least three sets of single-sided position monitoring mechanisms 3 and side columns 4 are installed on the four sides of the slider, with the single-sided position monitoring mechanisms 3 mounted on the corresponding side columns 4.

[0024] The single-sided position monitoring mechanism 3 of the cylinder slider mainly consists of a mounting base 31, a contact transmission module 32, a rotating shaft module 33, a crank connecting rod mechanism 34, a linear guide pair 35, a detection module 36, and a signal processing and display module. The mounting base 31 is a welded part, which is fixed to the side column 4 of the hydraulic press by bolts.

[0025] The contact transmission module 32 includes a measuring rod 322 and a high-precision roller 321 located at the front end of the measuring rod. The roller has no sliding rolling contact with the surface of the hydraulic press master cylinder slider. When the master cylinder experiences center offset (radial displacement) or circumferential torsion (angular displacement), the roller drives the measuring rod to rotate around the tail end pivot point.

[0026] The rotating shaft module 33 includes a rotating shaft 331, a torsion spring 332, and a bearing housing 335. The bearing housing is mounted on the mounting base, and the rotating shaft passes through the bearing housing. The rear end of the measuring rod is connected to one end of the rotating shaft. The torsion spring is fitted onto the rotating shaft, and the clamping force of the torsion spring ensures that the roller of the contact transmission module abuts against the slider of the main cylinder. A pair of limit adjustment blocks are provided on the rotating shaft, and the torsion spring is located between the pair of limit adjustment blocks, with the end of the torsion spring connected to the limit adjustment block on the corresponding side.

[0027] Preferably, the rotating shaft module includes a rotating shaft 331, a torsion spring 332, a first-position limit adjustment block 333, a second-position limit adjustment block 334, and a bearing seat 335. The bearing seat is fixedly mounted on the mounting base 31, and the rotating shaft passes through the bearing seat. The first-position limit adjustment block is fixedly mounted on the left side of the rotating shaft, and the second-position limit adjustment block is fixedly mounted on the right side of the rotating shaft. The torsion spring is fitted onto the rotating shaft, with its left end fixedly mounted on the first-position limit adjustment block and its right end fixedly mounted on the second-position limit adjustment block. Adjusting the relative positions of the first-position limit adjustment block, the second-position limit adjustment block, and the rotating shaft can adjust the clamping force of the torsion spring, ensuring that the roller of the contact transmission module abuts against the main cylinder slider 2.

[0028] The crank-connecting rod mechanism 34 includes a crank 341, a connecting rod 342, and a sliding block 343; one end of the connecting rod is connected to the other end of the rotating shaft through the crank, and the other end of the connecting rod is connected to the sliding block through a ball joint; both ends of the rotating shaft are connected to the measuring rod and the crank respectively to form a rotating shaft module.

[0029] The linear guide pair 35 includes a linear guide 351 and a guide box 352; the linear guide is fixed on the mounting base, and the sliding block of the crank-connecting rod mechanism is located on the guide box, and the sliding block is connected to the detection module.

[0030] The detection module 36 includes a magnetostrictive displacement sensor probe 361, a magnetic ring 362, a magnetic ring holder 363, a magnetic isolation washer 364, and a probe base 365. The magnetic ring holder is provided with a magnetic ring. One end of the magnetic ring holder is fitted onto the magnetostrictive displacement sensor probe, and the other end is connected to the sliding block 343 of the crank-connecting rod mechanism. The magnetic ring holder moves up and down with the sliding block, and the movement position of the sliding block is monitored by the magnetostrictive displacement sensor.

[0031] The magnetic ring holder 363 has a threaded hole, and the magnetic isolation washer on the magnetic ring pad is fixed to the magnetic ring holder by screws; the measuring rod base is fixed on the mounting base.

[0032] The magnetostrictive displacement sensor probe of the detection module 36 is set parallel to the linear guide of the linear guide pair and perpendicular to the rotation axis of the rotation axis module.

[0033] The working principle is as follows: During operation, the single-sided position monitoring mechanism of the main cylinder is installed on any three sides of the main cylinder (north, south, east, and west). As the main cylinder moves up and down, the roller at the front end of the measuring rod rolls in contact with the slide block of the hydraulic press main cylinder. When the center of the main cylinder shifts, it drives the measuring rod to rotate around its tail end. This rotation drives the crank to rotate via the rotating shaft, which in turn drives the connecting rod to make the slider of the crank-connecting rod mechanism move linearly. This, in turn, drives the magnetic ring sleeve and the magnetic ring to move up and down. The PLC converts the measurement signal from the magnetostrictive displacement sensor into an analog-to-digital signal through a data acquisition card and transmits it to the host computer. The host computer processes the signal and calculates the crank rotation angle according to a preset program, converting it into the rotation angle of the measuring rod. This yields the offset of the main cylinder center and the circumferential torsion value, and simulates a three-dimensional model of the main cylinder's vertical movement, which is displayed in real time.

[0034] In this invention, the torsion spring, through a crank-connecting rod mechanism, keeps the detection wheel pressed tightly against the press slide block, ensuring that the offset of the detection wheel corresponds to the offset of the main cylinder center, thus ensuring accurate monitoring. The limit adjustment block ensures that the original position of the detection wheel is in the set position. The offset of the hydraulic press main cylinder center is detected by a roller contact method, and the offset of the hydraulic press center is converted into a displacement sensor detected by a magnetostrictive displacement sensor through a crank-connecting rod mechanism. The offset of the main cylinder center is then calculated. This non-contact measurement method ensures stable and reliable monitoring.

[0035] This invention has the following advantages: The monitoring system combines modular mechanical transmission design with magnetostrictive sensing technology to convert the complex offset of the main cylinder into a measurable displacement signal, realizing non-contact measurement using magnetostrictive sensing technology. It also boasts advantages such as high precision, wear resistance, and long lifespan. The design is novel, and the structure is simple and compact. The measurement is timely, accurate, and reliable, enabling real-time monitoring of the main cylinder's center. This allows for timely detection of main cylinder tilting issues during the rolling process, reducing wheel eccentricity and rim surface misalignment, avoiding a large number of scraps caused by main cylinder center deviation, improving product qualification rate, enhancing product quality, and ensuring smooth production.

[0036] The above description is merely an illustration of preferred embodiments of the present invention, and the above technical features can be arbitrarily combined to form multiple embodiments of the present invention.

[0037] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the concept and technical solution of the present invention, or the direct application of the concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A dynamic online monitoring device for the center of the main cylinder of a large hydraulic press, characterized in that: The system includes a set of single-sided position monitoring mechanisms for the main cylinder of a hydraulic press, which are used for dynamic monitoring of the center offset of the main cylinder. A set of sliders is provided along the circumferential direction of the main cylinder of the press, and each single-sided position monitoring mechanism corresponds to one slider. The single-sided position monitoring mechanism includes a mechanical transmission module for slider contact and a magnetostrictive displacement sensor for monitoring displacement. The mechanical transmission module and the magnetostrictive displacement sensor are configured in association.

2. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 1, characterized in that: The single-sided position monitoring mechanism of the master cylinder includes a mounting base and a contact transmission module, a rotary shaft module, a crank connecting rod mechanism, a linear guide pair, and a detection module associated with the mounting base; the mounting base is installed on the side column of the press, and the contact transmission module is a roller contact module, with the roller in contact with the slider.

3. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 2, characterized in that: The contact transmission module includes a measuring rod and a roller located at the front end of the measuring rod. The roller has no sliding rolling contact with the surface of the main cylinder slider of the hydraulic press.

4. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 3, characterized in that: The rotating shaft module includes a rotating shaft, a torsion spring, and a bearing housing. The bearing housing is mounted on the mounting base, and the rotating shaft passes through the bearing housing. The rear end of the measuring rod is connected to one end of the rotating shaft. The torsion spring is fitted onto the rotating shaft, and the clamping force of the torsion spring ensures that the roller of the contact transmission module abuts against the slider of the main cylinder.

5. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 4, characterized in that: A pair of limit adjustment blocks are provided on the rotating shaft, and a torsion spring is located between the pair of limit adjustment blocks, with the end of the torsion spring connected to the limit adjustment block on the corresponding side.

6. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 4, characterized in that: The crank-connecting rod mechanism includes a crank, a connecting rod, and a sliding block; one end of the connecting rod is connected to the other end of the rotating shaft through the crank, and the other end of the connecting rod is connected to the sliding block through a ball joint; both ends of the rotating shaft are connected to the measuring rod and the crank respectively to form a rotating shaft module.

7. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 6, characterized in that: The linear guide pair includes a linear guide and a guide box; the linear guide is fixed on the mounting base, and the sliding block of the crank-connecting rod mechanism is located on the guide box, and the sliding block is connected to the detection module.

8. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 7, characterized in that: The detection module includes a magnetostrictive displacement sensor probe, a magnetic ring, a magnetic ring holder, a magnetic isolation washer, and a probe base. The magnetic ring holder has a magnetic ring on it. One end of the magnetic ring holder is fitted onto the magnetostrictive displacement sensor probe, and the other end is connected to the sliding block of the crank-connecting rod mechanism. The magnetic ring holder moves up and down with the sliding block, and the movement position of the sliding block is monitored by the magnetostrictive displacement sensor.

9. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 8, characterized in that: The magnetic ring sleeve is provided with threaded holes, and the magnetic isolation washer on the magnetic ring pad is fixed to the magnetic ring sleeve by screws; the measuring rod base is fixed on the mounting base.

10. The large hydraulic press main cylinder center dynamic online monitoring device as described in claim 9, characterized in that: The magnetostrictive displacement sensor probe of the detection module is arranged parallel to the linear guide rail of the linear guide pair and perpendicular to the rotation axis of the rotation axis module.

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