A pipe saw horizontal centering and clamping device

Abstract

The application provides a pipe row saw steel pipe horizontal centering and clamping device, which comprises a base, a guide shaft, clamping mechanisms and oil cylinders, wherein the guide shaft is horizontally arranged on the base; the clamping mechanisms are provided in two groups, the two groups of clamping mechanisms are symmetrically sleeved on the guide shaft; the oil cylinders are provided in two, the two oil cylinders are arranged on the base, and the two oil cylinders are connected with the two clamping mechanisms respectively; the two oil cylinders can synchronously drive the two clamping mechanisms to move oppositely or move away along the guide shaft, so that the steel pipe is horizontally centered and clamped or loosened. The first oil cylinder and the second oil cylinder of the clamping device are controlled by a hydraulic system, so that the accurate control of three working stages of clamping, pressure maintaining and loosening is realized, the flatness of the sawing end face of the steel pipe and the stability of the sawing process are ensured, the centering and clamping effect is good, the guiding stability is high, the equipment structure is simple, the failure rate is low, and the manufacturing cost is low.

Description

Technical Field

[0001] This invention relates to the field of steel pipe equipment technology, and in particular to a horizontal centering and clamping device for steel pipes in a pipe saw. Background Technology

[0002] In the steel pipe production process, after heating, piercing, rolling, sizing, and straightening, the resulting round solid billets produce tubes of varying lengths and uneven ends, failing to meet the final product delivery standards. To ensure that the steel pipe ends are flush and aesthetically pleasing upon delivery, both ends of the steel pipes need to be sawn. Before sawing, multiple steel pipes (usually 1 to 5) must be assembled into a row and precisely aligned and reliably clamped. Currently, the industry commonly uses a U-shaped linear guide pair + hydraulic cylinder alignment and clamping device. The hydraulic cylinder is installed laterally, which introduces the following drawbacks to the alignment and clamping device: 1. Insufficient load-bearing capacity: The hydraulic cylinder has a small diameter (usually 63mm). When the weight of a single steel pipe exceeds 2 tons, the clamping force of the clamping device is insufficient. The guide rail slider is prone to cracking and failure. The guide rail surface is also prone to scratches and pitting due to uneven stress, resulting in poor movement or even jamming. Spare parts need to be replaced frequently, and the equipment failure rate remains high.

[0003] 2. Fragile roller structure: The bearings assembled on the rollers have low load-bearing capacity and are easily damaged. The welded joints of the roller shaft are prone to breakage and cannot be replaced as a whole.

[0004] 3. Difficult to maintain: Sawdust easily accumulates inside the device and is difficult to clean. The lateral positioning of the hydraulic cylinder is difficult to disassemble and assemble, and the bolts are easily stretched and cut off. The piston rod is prone to bending and deformation, affecting production efficiency and stability. Summary of the Invention

[0005] The purpose of this invention is to provide a horizontal centering clamping device for steel pipes in a pipe saw, which realizes horizontal centering and clamping of steel pipes. The clamping device has a large load-bearing capacity, a wide range of clamping specifications, a simple structure, and a low failure rate.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A horizontal centering and clamping device for steel pipes in a pipe saw includes a base, a guide shaft, a clamping mechanism, and hydraulic cylinders. The guide shaft is horizontally mounted on the base. Two sets of clamping mechanisms are symmetrically mounted on the guide shaft. Two hydraulic cylinders are mounted on the base and connected to the two clamping mechanisms respectively. The two hydraulic cylinders can synchronously drive the two clamping mechanisms to move towards or away from each other along the guide shaft, thereby achieving horizontal centering and clamping or releasing of the steel pipe.

[0007] Furthermore, in the aforementioned horizontal centering and clamping device for steel pipes in a pipe saw, two first mounting platforms and one second mounting platform are provided on the base. The two first mounting platforms are located at opposite ends of the base along its length, and the second mounting platform is located between the two first mounting platforms. The base, the two first mounting platforms, and the second mounting platform are an integral structure. Guide shaft supports are bolted to the first mounting platforms, and the two ends of the guide shaft are respectively mounted on the two guide shaft supports. An intermediate support is bolted to the second mounting platform, and the middle part of the guide shaft is supported by the intermediate support. The guide shaft supports and the intermediate support are at the same height. Shims are provided between the guide shaft supports and the first mounting platforms, and between the intermediate support and the second mounting platform. By adjusting the number of shims, the height of the guide shaft supports or the intermediate support can be finely adjusted to ensure that the height error between the guide shaft supports and the intermediate support is less than 0.5 mm.

[0008] Furthermore, in the aforementioned horizontal centering and clamping device for steel pipes in a pipe saw, the hydraulic cylinder is connected to the first mounting platform via a fixing assembly. The fixing assembly includes a fixing support, which is disposed on the first mounting platform and located outside the guide shaft support. Two T-shaped seats are arranged opposite each other on the fixing support, and each T-shaped seat has a mounting hole in which a copper sleeve is disposed. Two trunnions are arranged opposite each other on the outer wall of the hydraulic cylinder, and the hydraulic cylinder is hinged to the two copper sleeves of the T-shaped seats via the two trunnions. The copper sleeves are graphite self-lubricating copper sleeves.

[0009] Furthermore, in the above-mentioned horizontal centering and clamping device for steel pipes in a pipe saw, the clamping mechanism includes a mounting plate, a sliding bearing seat, and a clamping assembly. The sliding bearing seat is equipped with a guide sleeve inside, and the sliding bearing seat is sleeved on the guide shaft through the guide sleeve. The mounting plate is disposed above the sliding bearing seat. The clamping assembly is disposed on the mounting plate, and the clamping mechanism clamps the steel pipe through the clamping assembly.

[0010] Furthermore, in the aforementioned horizontal centering clamping device for steel pipes in a pipe saw, the clamping assembly includes a wheel axle, tapered roller bearings, a roller, and a cap. A lower locking nut is provided at the lower end of the wheel axle, and the wheel axle is fixed to the mounting plate by the lower locking nut. Two tapered roller bearings are provided, each mounted on the wheel axle, with an inner ring spacer between the two bearings. The roller is mounted on the two tapered roller bearings. An upper locking nut and a locking washer are provided at the upper end of the wheel axle, with the locking washer located inside the upper locking nut. The upper end of the wheel axle is locked by the locking washer and the upper locking nut. The cap covers the upper end of the roller and is bolted to the roller.

[0011] Furthermore, in the above-mentioned horizontal centering and clamping device for steel pipes in a pipe saw, the cylinder diameter is 80mm.

[0012] Furthermore, in the above-mentioned horizontal centering and clamping device for steel pipes in a pipe saw, the two hydraulic cylinders are a first hydraulic cylinder and a second hydraulic cylinder, the first hydraulic cylinder is a single-rod hydraulic cylinder, and the second hydraulic cylinder is a double-rod hydraulic cylinder; an ear seat is provided on the mounting plate, and a hinge shaft is provided at the telescopic end of the first hydraulic cylinder. The first hydraulic cylinder is hinged to the ear seat of one of the clamping mechanisms through the hinge shaft. The second hydraulic cylinder has a first piston rod and a second piston rod, and a hinge shaft is provided at the end of the first piston rod. The second hydraulic cylinder is hinged to the ear seat of another clamping mechanism through the hinge shaft.

[0013] Furthermore, in the aforementioned horizontal alignment and clamping device for steel pipes in a pipe saw, both the first and second cylinders are controlled by a hydraulic system. The hydraulic system includes a directional valve. The first port of the directional valve is connected to a high-pressure oil pipeline, the second port is connected to a return oil pipeline, and the third port is connected to the rodless chamber of the first cylinder via a first pipeline. The rod chamber of the first cylinder is connected to the right chamber of the second cylinder via a second pipeline. A first check valve is installed on the second pipeline, and the left chamber of the second cylinder is connected to the fourth port of the directional valve via a third pipeline. The second check valve is located between the third pipeline and the first cylinder and the first check valve. The pipelines are connected by a fourth pipeline, on which a second check valve is installed; the right chamber of the second cylinder is connected to the return oil pipeline by a fifth pipeline, on which a third check valve is installed; the oil in the high-pressure oil pipeline flows into the rodless chamber of the first cylinder through the first pipeline, pushing the piston rod of the first cylinder to extend; the oil in the rod chamber of the first cylinder enters the right chamber of the second cylinder through the second pipeline, pushing the piston rod of the second cylinder to extend, thereby achieving the centering and clamping action of the steel pipe; the oil in the rodless chamber of the first cylinder can return through the reversing valve, and the right chamber of the second cylinder can return through the third check valve, thereby achieving the releasing action.

[0014] Furthermore, in the above-mentioned horizontal centering and clamping device for steel pipes of the pipe saw, a hydraulic control check valve and a pressure sensor are installed on the first pipeline, and the pressure sensor can monitor the pressure in the first pipeline. The right chamber of the second oil cylinder is connected to the high-pressure oil pipeline through a pressure-holding pipeline, and a fourth check valve is provided on the pressure-holding pipeline; When the pressure sensor reaches the set value, the hydraulic system performs a pressure holding action. The rodless chamber of the first cylinder is locked by the hydraulic control check valve, the fourth check valve is opened, and the high-pressure oil line is connected to the right chamber of the second cylinder to achieve pressure holding.

[0015] Furthermore, in the aforementioned pipe saw horizontal alignment and clamping device for steel pipes, a pressure relief valve is also installed on the fifth pipeline.

[0016] Analysis reveals that this invention discloses a horizontal centering and clamping device for steel pipes in a pipe saw. Under the control of a hydraulic system, the first and second cylinders of this device achieve precise control of the three working stages: clamping, pressure holding, and releasing, ensuring the flatness of the sawn pipe end face and the stability of the sawing process. This clamping device has a large load-bearing capacity and a wide range of clamping specifications. It is easy to assemble and disassemble. The cylinders are mounted above the base, solving the problem of easily bent piston rods in fixed cylinders, reducing the failure rate. On-site installation and centering adjustments are highly efficient, and subsequent maintenance and replacement are simple. This clamping device has good centering and clamping effects, high guiding stability, a simple structure, low failure rate, and low manufacturing cost. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of a structure according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of a fixing component according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the structure of a T-shaped seat according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of a clamping assembly according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of a hydraulic system according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1. Base; 2. Guide shaft; 3. First hydraulic cylinder; 4. Second hydraulic cylinder; 5. First mounting platform; 6. Second mounting platform; 7. Guide shaft support; 8. Intermediate support; 9. Fixed support; 10. 11 T-type seat; 12 Mounting hole; 12 Copper sleeve; 13 Trunnion; 14 Mounting plate; 15 Sliding bearing seat; 16 Guide sleeve; 17 Clamping assembly; 18 Wheel axle; 19 Tapered roller bearing; 20 Roller; 21 End cap; 22 Lower locking nut; 23 Inner ring spacer; 24 Upper locking nut; 25 Anti-reverse washer; 26 Ear seat; 27 Hinge shaft; 28 First piston rod; 29 Second piston rod; 30 Reversing valve; 31 First pipeline; 32 Second pipeline; 33 Third pipeline; 34 Fourth pipeline; 35 Fifth pipeline; 36 Pressure holding pipeline; 37 First check valve; 38 Second check valve; 39 Third check valve; 40 Fourth check valve; 41 Hydraulic control check valve; 42 Pressure sensor; 43 Pressure relief valve. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. Indeed, those skilled in the art will recognize that modifications and variations can be made to the invention without departing from its scope or spirit. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the invention encompass such modifications and variations falling within the scope of the appended claims and their equivalents.

[0024] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0025] The accompanying drawings illustrate one or more examples of the invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0026] like Figures 1 to 5 As shown, according to an embodiment of the present invention, a horizontal centering and clamping device for steel pipes in a pipe saw is provided, such as... Figure 1 As shown, the clamping device includes a base 1, a guide shaft 2, a clamping mechanism, and hydraulic cylinders. The guide shaft 2 is horizontally mounted on the base 1, providing a linear motion guide for the clamping mechanism. Two sets of clamping mechanisms are provided, symmetrically mounted on the guide shaft 2. Two hydraulic cylinders are provided, both mounted on the base 1, and each connected to one of the two clamping mechanisms. The two hydraulic cylinders can synchronously drive the two clamping mechanisms to move towards or away from each other along the guide shaft 2, thereby achieving centering, clamping, or releasing the steel pipe.

[0027] In practical applications, one set of this clamping device needs to be installed on the outside of the inlet and outlet baffles of the pipe saw main unit. During sawing operations, the two sets of clamping devices apply force to clamp the steel pipe from the middle, working in conjunction with the horizontal clamps of the saw body to fix the ends of the steel pipe, forming a three-point clamping structure of "both ends - middle", ensuring that the steel pipe is strictly perpendicular to the saw blade. Since the device is directly installed on the ground, the clamping force and the cutting force generated by sawing can be directly transmitted to the ground through the base 1, effectively offsetting sawing vibration and ensuring the flatness of the sawn end face of the steel pipe and the stability of the sawing process.

[0028] Furthermore, two first mounting platforms 5 and one second mounting platform 6 are provided on the base 1. The two first mounting platforms 5 are located at both ends of the base 1 along its length, and the second mounting platform 6 is located between the two first mounting platforms 5. The base 1, the two first mounting platforms 5, and the second mounting platform 6 are an integral structure. Guide shaft supports 7 are bolted to the first mounting platforms 5, and the two ends of the guide shaft 2 are respectively mounted on the two guide shaft supports 7. An intermediate support 8 is bolted to the second mounting platform 6, and the middle part of the guide shaft 2 is supported by the intermediate support 8. The guide shaft supports 7 and the intermediate support 8 are at the same height. Shims are provided between the guide shaft supports 7 and the first mounting platforms 5, and between the intermediate support 8 and the second mounting platform 6. By adjusting the number of shims, the height of the guide shaft supports 7 or the intermediate support 8 can be finely adjusted to ensure that the height error between the guide shaft supports 7 and the intermediate support 8 is less than 0.5mm, providing a high-precision horizontal support reference for the guide shaft 2. The guide shaft 2 is positioned at both ends by guide shaft supports 7 and supported in the middle by intermediate supports 8. The three-point support structure effectively avoids the deflection deformation of the long shaft, ensures the straightness of the movement trajectory of the clamping mechanism, and provides a basic guarantee for the centering accuracy.

[0029] Furthermore, the hydraulic cylinder is connected to the first mounting platform 5 via a fixing assembly, such as... Figure 2 As shown, the fixing assembly includes a fixing support 9, which is mounted on the first mounting platform 5 and located outside the guide shaft support 7; two T-shaped seats 10 are arranged opposite each other on the fixing support 9, as shown. Figure 3 As shown, the T-shaped seat 10 is provided with mounting holes 11, and a copper sleeve 12 is provided inside the mounting holes 11. Two trunnions 13 are arranged opposite each other on the outer wall of the cylinder. The cylinder is hinged to the two copper sleeves 12 of the T-shaped seat 10 through the two trunnions 13. The copper sleeves 12 are graphite self-lubricating copper sleeves 12. The trunnions 13 can rotate through the copper sleeves 12. The cylinder is installed above the base 1 through the cooperation of the T-shaped seat 10 and the trunnions 13. This solves the problem of unstable cylinder positioning and easy bending of the piston rod, reduces the failure rate, improves the efficiency of on-site installation and alignment, and simplifies subsequent maintenance and replacement.

[0030] Furthermore, the clamping mechanism includes a mounting plate 14, a sliding bearing seat 15, and a clamping assembly 17. The sliding bearing seat 15 contains a guide sleeve 16, which is fitted onto the guide shaft 2. The guide sleeve 16 allows the sliding bearing seat 15 to slide on the guide shaft 2 with low friction. The mounting plate 14 is positioned above the sliding bearing seat 15; the clamping assembly 17 is mounted on the mounting plate 14, and the clamping mechanism clamps the steel pipe via the clamping assembly 17. The clamping assembly 17 is directly mounted on the mounting plate 14, resulting in a compact overall structure that facilitates modular disassembly and maintenance.

[0031] Furthermore, such as Figure 4 As shown, the clamping assembly 17 includes a wheel axle 18, tapered roller bearings 19, rollers 20, and a cap 21. A lower locking nut 22 is provided at the lower end of the wheel axle 18, and the wheel axle 18 is fixed to the mounting plate 14 by the lower locking nut 22. Two tapered roller bearings 19 are provided, and both tapered roller bearings 19 are fitted on the wheel axle 18. An inner ring spacer 23 is provided between the two tapered roller bearings 19 to ensure preload. Roller 20 is mounted on two tapered roller bearings 19; upper lock nut 24 and anti-reverse washer 25 are provided at the upper end of axle 18, the anti-reverse washer 25 is located inside the upper lock nut 24, and the upper end of axle 18 is locked by anti-reverse washer 25 and upper lock nut 24; cover 21 covers the upper end of roller 20, and cover 21 is bolted to roller 20. The top of clamping assembly 17 is sealed by cover 21 and bolts, which can effectively prevent cutting chips and dust from entering the tapered roller bearing 19, achieving long-term maintenance-free operation.

[0032] Furthermore, the cylinder diameter is 80mm, which enables the clamping device to provide greater clamping force, meeting the stable sawing requirements of large-diameter steel pipes.

[0033] Furthermore, the two cylinders are a first cylinder 3 and a second cylinder 4, respectively. The first cylinder 3 is a single-rod cylinder, and the second cylinder 4 is a double-rod cylinder. An ear seat 26 is provided on the mounting plate 14. A hinge shaft 27 is provided at the telescopic end of the first cylinder 3. The first cylinder 3 is hinged to the ear seat 26 of a clamping mechanism through the hinge shaft 27. The second cylinder 4 has a first piston rod 28 and a second piston rod 29. A hinge shaft 27 is provided at the end of the first piston rod 28. The second cylinder 4 is hinged to the ear seat 26 of another clamping mechanism through the hinge shaft 27.

[0034] Furthermore, the first cylinder 3 has a rodless chamber and a rod chamber, and the second cylinder 4 has a left chamber and a right chamber. The left chamber of the second cylinder 4 is closer to the rod chamber of the first cylinder 3 than the right chamber. The first piston rod 28 is located in the left chamber of the second cylinder 4. Both the first cylinder 3 and the second cylinder 4 are controlled by a hydraulic system.

[0035] like Figure 5As shown, the hydraulic system includes a directional valve 30; the first port P of the directional valve 30 is connected to the high-pressure oil pipeline, the second port T of the directional valve 30 is connected to the return oil pipeline, the third port A of the directional valve 30 is connected to the rodless chamber of the first cylinder 3 through the first pipeline 31, the rod chamber of the first cylinder 3 is connected to the right chamber of the second cylinder 4 through the second pipeline 32, a first check valve 37 is provided on the second pipeline 32, and the left chamber of the second cylinder 4 is connected to the fourth port B of the directional valve 30 through the third pipeline 33. Oil in the high-pressure oil line flows into the rodless chamber of the first cylinder 3 through the first line 31, pushing the piston rod of the first cylinder 3 to extend. Oil in the rod chamber of the first cylinder 3 enters the right chamber of the second cylinder 4 through the second line 32, pushing the piston rod of the second cylinder 4 to extend, thereby achieving the centering and clamping action of the steel pipe. The third pipeline 33 is connected to the second pipeline 32 between the first cylinder 3 and the first check valve 37 via a fourth pipeline 34, on which a second check valve 38 is installed. The right chamber of the second cylinder 4 is connected to the return oil pipeline via a fifth pipeline 35, on which a third check valve 39 is installed. Oil in the rodless chamber of the first cylinder 3 can return through the reversing valve 30, and oil in the right chamber of the second cylinder 4 can return through the third reversing valve 39, thus achieving the release action.

[0036] Furthermore, a hydraulically controlled check valve 41 and a pressure sensor 42 are installed on the first pipeline 31. The pressure sensor 42 can monitor the pressure in the first pipeline 31. The right chamber of the second cylinder 4 is connected to the high-pressure oil pipeline through a pressure-holding pipeline 36, which is equipped with a fourth check valve 40. When the pressure sensor 42 reaches the set value, the hydraulic system performs a pressure-holding action. The rodless chamber of the first cylinder 3 is locked by the hydraulically controlled check valve 41, the fourth check valve 40 is opened, and the high-pressure oil pipeline is connected to the right chamber of the second cylinder 4 to achieve pressure holding.

[0037] Furthermore, a pressure relief valve 43 is installed on the fifth pipeline 35 to safely release system pressure and improve equipment operation safety.

[0038] This clamping mechanism employs a combination of a single-rod hydraulic cylinder and a double-rod hydraulic cylinder as the clamping force output unit. During clamping, oil is supplied to the rodless chamber of the single-rod hydraulic cylinder (first cylinder 3). Since the piston in the rodless chamber of the single-rod cylinder has the largest force-bearing area, it can provide a stronger driving force. While two double-rod hydraulic cylinders can achieve synchronous action, the piston area subjected to oil pressure in the double-rod cylinders is much smaller than the force-bearing area in the rodless chamber of the single-rod cylinder, resulting in a correspondingly weaker clamping force. This combined design of the clamping mechanism effectively improves the clamping force output strength while ensuring synchronization.

[0039] The hydraulic system of this clamping device adopts a series-parallel composite control logic. Through the coordinated operation of the directional valve 30, multiple check valves, and pressure sensor 42, it achieves precise control of the three working stages: clamping, holding pressure, and releasing. Clamping Stage: The directional valve 30 and the first check valve 37 are opened. The high-pressure oil line and the rodless chamber of the first cylinder 3 are connected through the directional valve 30 and the first line 31. The rod chamber of the first cylinder 3 and the right chamber of the second cylinder 4 are connected through the second line 32 and the first check valve 37. Pressurized oil from the high-pressure oil line enters the rodless chamber of the first cylinder 3, pushing the piston rod of the first cylinder 3 to extend. Simultaneously, oil discharged from the rod chamber of the first cylinder 3 enters the right chamber of the second cylinder 4 through the second line 32 (the volume of oil flowing out of the rod chamber of the first cylinder 3 and the volume of oil entering the right chamber of the second cylinder 4 are equal), pushing the piston rod of the second cylinder 4 to extend synchronously. Oil returning from the left chamber of the second cylinder 4 returns through the directional valve 30. The first cylinder 3 and the second cylinder 4 are in series, ensuring that the two clamping mechanisms move synchronously towards each other, achieving the centering clamping action.

[0040] Pressure Holding Stage: When the clamping is in place and the system pressure reaches the set value of the pressure sensor 42, the system enters the pressure holding state. The hydraulic check valve 41 locks the rodless chamber of the first cylinder 3, and the fourth check valve 40 opens to continuously replenish oil to the right chamber of the second cylinder 4, maintaining the pressure of the second cylinder 4, thereby ensuring the stability of the steel pipe when the pipe saw cuts it.

[0041] Release phase: The reversing valve 30 reverses, and the second check valve 38 and the third check valve 39 open. At this time, the first cylinder 3 and the second cylinder 4 are in parallel mode. The high-pressure oil pipeline and the rod chamber of the first cylinder 3 are connected through the first pipeline 31, the fourth pipeline 34 and the second check valve 38. At the same time, the high-pressure oil pipeline and the left chamber of the second cylinder 4 are connected through the fifth pipeline 35 and the third check valve 39. The pressurized oil enters the rod chamber of the first cylinder 3 and the left chamber of the second cylinder 4 respectively, pushing the piston rod of the first cylinder 3 and the piston rod of the second cylinder 4 to retract synchronously, thus quickly opening the cylinder.

[0042] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: A horizontal centering and clamping device for steel pipes in a pipe saw is disclosed. Under the control of a hydraulic system, the first cylinder 3 and the second cylinder 4 of this device achieve precise control of three working stages: clamping, pressure holding, and releasing, ensuring the flatness of the sawn pipe end face and the stability of the sawing process. This clamping device has a large load-bearing capacity and a wide range of clamping specifications. It is easy to assemble and disassemble. The cylinders are mounted above the base 1, solving the problem of easily bent piston rods in fixed cylinders, reducing the failure rate. On-site installation and centering debugging are highly efficient, and subsequent maintenance and replacement are simple. This clamping device has good centering and clamping effects, high guiding stability, a simple structure, low failure rate, and low manufacturing cost.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A horizontal centering and clamping device for steel pipes in a pipe saw, characterized in that, Includes a base, guide shaft, clamping mechanism, and hydraulic cylinder, among which, The guide shaft is horizontally arranged on the base; The clamping mechanism is provided in two sets, and the two sets of clamping mechanisms are symmetrically sleeved on the guide shaft; Two hydraulic cylinders are provided, both of which are mounted on the base, and each of the two hydraulic cylinders is connected to one of the two clamping mechanisms. The two hydraulic cylinders can synchronously drive the two clamping mechanisms to move towards or away from each other along the guide shaft, thereby achieving horizontal centering and clamping or releasing of the steel pipe.

2. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 1, characterized in that, Two first mounting platforms and one second mounting platform are provided on the base. The two first mounting platforms are located at both ends of the base along its length, and the second mounting platform is located between the two first mounting platforms. The base, the two first mounting platforms and the second mounting platform are an integral structure. A guide shaft support is bolted to the first mounting platform, and the two ends of the guide shaft are respectively mounted on the two guide shaft supports; An intermediate support is bolted to the second mounting platform, and the middle part of the guide shaft is supported by the intermediate support. The guide shaft support and the intermediate support are at the same height. Shims are provided between the guide shaft support and the first mounting platform, and between the intermediate support and the second mounting platform. By adjusting the number of shims, the height of the guide shaft support or the intermediate support can be finely adjusted to ensure that the height error between the guide shaft support and the intermediate support is less than 0.5mm.

3. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 2, characterized in that, The hydraulic cylinder is connected to the first mounting platform via a fixing assembly. The fixing assembly includes a fixing support, which is disposed on the first mounting platform and located outside the guide shaft support. Two T-shaped seats are arranged opposite each other on the fixed support. The T-shaped seats are provided with mounting holes, and copper sleeves are provided in the mounting holes. Two trunnions are arranged opposite each other on the outer wall of the oil cylinder, and the oil cylinder is hinged to the two copper sleeves of the T-shaped seat through the two trunnions; The copper sleeve is a graphite self-lubricating copper sleeve.

4. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 1, characterized in that, The clamping mechanism includes a mounting plate, a sliding bearing seat, and a clamping assembly. The sliding bearing housing is equipped with a guide sleeve inside, and the sliding bearing housing is sleeved on the guide shaft through the guide sleeve. The mounting plate is disposed above the sliding bearing housing. The clamping assembly is mounted on the mounting plate, and the clamping mechanism clamps the steel pipe through the clamping assembly.

5. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 4, characterized in that, The clamping assembly includes a wheel axle, a tapered roller bearing, a roller, and a cap. A lower locking nut is provided at the lower end of the wheel axle, and the wheel axle is fixed to the mounting plate by the lower locking nut. Two tapered roller bearings are provided, and both tapered roller bearings are mounted on the axle. An inner ring spacer is provided between the two tapered roller bearings, and the roller is mounted on the two tapered roller bearings. The upper end of the axle is provided with an upper locking nut and a backstop washer. The backstop washer is located inside the upper locking nut. The upper end of the axle is locked by the backstop washer and the upper locking nut. The cover covers the upper end of the roller, and the cover is bolted to the roller.

6. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 1, characterized in that, The cylinder diameter is 80mm.

7. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 4, characterized in that, The two hydraulic cylinders are a first hydraulic cylinder and a second hydraulic cylinder, the first hydraulic cylinder being a single-rod hydraulic cylinder and the second hydraulic cylinder being a double-rod hydraulic cylinder; The mounting plate is provided with an ear seat, and the telescopic end of the first hydraulic cylinder is provided with a hinge shaft. The first hydraulic cylinder is hinged to the ear seat of one of the clamping mechanisms through the hinge shaft. The second hydraulic cylinder has a first piston rod and a second piston rod. The end of the first piston rod is provided with a hinge shaft, and the second hydraulic cylinder is hinged to the ear seat of another clamping mechanism through the hinge shaft.

8. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 7, characterized in that, Both the first and second hydraulic cylinders are controlled by a hydraulic system; The hydraulic system includes a directional valve; The first port of the reversing valve is connected to the high-pressure oil pipeline, the second port of the reversing valve is connected to the return oil pipeline, the third port of the reversing valve is connected to the rodless chamber of the first cylinder through the first pipeline, the rod chamber of the first cylinder is connected to the right chamber of the second cylinder through the second pipeline, a first check valve is provided on the second pipeline, and the left chamber of the second cylinder is connected to the fourth port of the reversing valve through the third pipeline. The third pipeline is connected to the second pipeline between the first oil cylinder and the first check valve via a fourth pipeline, and a second check valve is provided on the fourth pipeline. The right chamber of the second oil cylinder is connected to the return oil line through a fifth line, and a third check valve is installed on the fifth line. The oil in the high-pressure oil line flows into the rodless chamber of the first cylinder through the first line, pushing the piston rod of the first cylinder to extend. The oil in the rod chamber of the first cylinder enters the right chamber of the second cylinder through the second line, pushing the piston rod of the second cylinder to extend, thereby achieving the centering and clamping action of the steel pipe. The oil in the rodless chamber of the first cylinder can return through the reversing valve, and the oil in the right chamber of the second cylinder can return through the third check valve, thus realizing the release action.

9. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 8, characterized in that, The first pipeline is equipped with a hydraulic check valve and a pressure sensor, and the pressure sensor can monitor the pressure in the first pipeline. The right chamber of the second oil cylinder is connected to the high-pressure oil pipeline through a pressure-holding pipeline, and a fourth check valve is provided on the pressure-holding pipeline; When the pressure sensor reaches the set value, the hydraulic system performs a pressure holding action. The rodless chamber of the first cylinder is locked by the hydraulic control check valve, the fourth check valve is opened, and the high-pressure oil line is connected to the right chamber of the second cylinder to achieve pressure holding.

10. The horizontal centering and clamping device for steel pipes in a pipe saw according to claim 8, characterized in that, A pressure relief valve is also installed on the fifth pipeline.

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