Clamping mechanism and method for a horizontal sawing machine for seamless steel pipes

Abstract

The present application relates to the technical field of horizontal sawing machine, in particular to a clamping mechanism and method of seamless steel pipe horizontal sawing machine, which comprises a clamping mechanism, the clamping mechanism comprises a rear end feeding clamping assembly and a front end positioning clamping assembly for clamping and fixing the steel pipe body, and the inside of the front end positioning clamping assembly is provided with an auxiliary clamping mechanism; during sawing, the auxiliary clamping mechanism is in multi-point type and is attached to the surface of the steel pipe body, thereby forming uniform clamping of the steel pipe body; during feeding, the rear end feeding clamping assembly clamps the steel pipe body to feed forward, the auxiliary clamping mechanism keeps low friction guiding of the steel pipe body through rolling contact, so that the front end positioning clamping assembly keeps clamping state without loosening during the feeding process, and meanwhile, the front end positioning clamping assembly can reflect the flatness state of the surface of the steel pipe body through the extension amount during the clamping process of the steel pipe body.

Description

Technical Field

[0001] This invention relates to the field of horizontal sawing technology, and more specifically, to a clamping mechanism and method for a seamless steel pipe horizontal sawing machine. Background Technology

[0002] Seamless steel pipe is a long strip of steel with a hollow cross-section and no seams around its perimeter. It is widely used in petrochemical, fluid transportation and other fields, and has the characteristics of high strength and good sealing performance. During the factory and subsequent processing and use, seamless steel pipes need to be cut to length according to the actual use length, dividing the long steel pipe into short sections that meet the specifications. Therefore, steel pipe sawing is an essential process in the processing and production of seamless steel pipes.

[0003] Currently, most seamless steel pipe length cutting is done using horizontal sawing machines. Horizontal sawing machines use a clamping and feeding sawing method, specifically including two sets of clamping mechanisms at the front and rear. The bottom of the rear clamping mechanism can slide and move. During operation, the rear clamping mechanism clamps the steel pipe and drives the steel pipe forward for feeding. The saw blade of the sawing machine cuts the steel pipe. The front clamping mechanism must first release the steel pipe during the feeding and moving process driven by the rear clamping mechanism. After a single feed is completed, it will re-clamp and position the steel pipe. This is done in conjunction with the reciprocating continuous feeding sawing operation.

[0004] The clamping mechanism of horizontal sawing machines typically adopts a flat plate rigid clamping structure. Flat plate clamping is a rigid contact clamping method. When clamping thin-walled seamless steel pipes, the rigid plate is prone to generating local extrusion stress on the outer wall surface of the steel pipe. The front clamping mechanism needs to repeatedly loosen and re-clamp during each steel pipe feeding process. Although the extrusion of the two clamping operations does not act on the same position in the axial direction of the steel pipe, the seamless steel pipe is a one-piece continuous hollow thin-walled component with low wall stiffness and weak resistance to extrusion deformation. The extrusion stress generated by a single rigid clamping will not only stay at the direct extrusion point, but will be transmitted and diffused along the axial and circumferential directions of the steel pipe wall. The dispersed local stress formed by multiple intermittent repeated clampings superimposes and accumulates, continuously aggravating the problem of rigid indentation on the steel pipe surface. In view of this, there is an urgent need for a clamping mechanism and method for seamless steel pipe horizontal sawing machines to solve the above problems. Summary of the Invention

[0005] This invention provides a clamping mechanism and method for a horizontal sawing machine for seamless steel pipes. It utilizes an array of elastic telescopic contact elements arranged within the front-end positioning and clamping assembly. These contact elements adaptively conform to the curved outer wall of the steel pipe, filling the end-end gaps created by traditional flat-plate clamping. Furthermore, during the steel pipe clamping and feeding operation, the differential telescopic states of the contact elements allow for direct identification of surface defects on the steel pipe, accelerating subsequent defect sorting and repair, and improving overall processing speed. This solves the problems mentioned in the background art, namely:

[0006] The flat plate rigid clamping mechanism of the horizontal saw will generate local extrusion stress when clamping seamless steel pipes. Although the clamping position is different due to the repeated clamping and loosening of the front clamping mechanism, the stress will be transmitted and spread along the pipe wall and accumulate because the seamless steel pipe is a one-piece continuous hollow thin-walled component, which will aggravate the problem of rigid indentation on the surface of the steel pipe.

[0007] To achieve the above objectives, one objective of this invention is to provide a clamping mechanism for a seamless steel pipe horizontal sawing machine, including a clamping mechanism mounted on the sawing machine body. The sawing machine body includes a bed base, and a feed platform is formed on the surface of the bed base. The front end of the feed platform is connected to a sawing platform. A sawing tool assembly is provided at the top of the connection between the feed platform and the sawing platform. The sawing tool assembly includes a saw blade. A controller is mounted at the end of the bed base, and the controller is electrically connected to the sawing tool assembly and the clamping mechanism.

[0008] The clamping mechanism includes a rear feed clamping assembly for clamping and fixing the steel pipe body and a front positioning clamping assembly. The front positioning clamping assembly is provided with an auxiliary clamping mechanism inside.

[0009] During sawing, the auxiliary clamping mechanism is attached to the surface of the steel pipe body at multiple points, forming a uniform clamping of the steel pipe body. During feeding, the rear feed clamping assembly clamps the steel pipe body and feeds it forward. The auxiliary clamping mechanism maintains low-friction guidance of the steel pipe body through rolling contact, so that the front positioning clamping assembly remains in a clamping state during the feeding process without loosening. At the same time, during the clamping process of the steel pipe body, the front positioning clamping assembly can reflect the flatness of the steel pipe body surface through the amount of extension and retraction.

[0010] Based on this, the rear feed clamping assembly includes a feed rail mounted on the surface of the feed platform. A base is slidably disposed on the surface of the feed rail. A first fixed clamping plate is fixedly mounted on one end of the base, and a feeding clamping drive is fixed on the other end of the base. The movable end of the feeding clamping drive is connected to the first movable clamping plate. The feeding clamping drive can drive the first movable clamping plate to move toward the first fixed clamping plate to clamp the steel pipe body and feed it along the feed rail in the sawing direction.

[0011] As a further improvement to this technical solution, the front-end positioning and clamping assembly includes a clamping seat disposed between the sawing platform and the feed platform. A second fixed clamping plate is fixedly installed at one end of the clamping seat, and a positioning and clamping drive is installed at the end of the clamping seat away from the second fixed clamping plate. The movable end of the positioning and clamping drive is connected to the second movable clamping plate. The positioning and clamping drive can drive the second movable clamping plate to move closer to the second fixed clamping plate to form a positioning cavity for positioning and clamping the front end of the steel pipe body.

[0012] As a further improvement to this technical solution, the auxiliary clamping mechanism includes multiple central holes formed in the middle of the second fixed clamping plate and the second movable clamping plate. The multiple central holes are arranged in an array on the second fixed clamping plate and the second movable clamping plate. Each central hole has a contact element movably disposed inside. The contact element is a rod-shaped structure and can elastically extend and retract along the axial direction of the central hole to form a multi-point elastic contact unit.

[0013] Based on this, each of the contact elements is movably provided with a contact ball at one end near the positioning cavity, and all of the contact balls have an inner rigid and outer flexible structure.

[0014] In another technical solution, a slider is fixedly installed on the surface of each contact member located inside the central hole, and a lateral rail groove is formed on the inner wall of each central hole, and the slider is slidably disposed inside the lateral rail groove.

[0015] One side surface of the slider is connected to an elastic element, and the other end of the elastic element is connected to the inner wall of the lateral rail groove. During the clamping process, each contact element generates different amounts of expansion and contraction according to the arc contour of the steel pipe body surface.

[0016] Each central hole on the second fixed clamping plate and the second movable clamping plate is fitted with a sealing ring near the opening of the positioning cavity, and the inner diameter of the sealing ring is adapted to the inner diameter of the central hole.

[0017] Each of the contact elements has a locating ring fixedly fitted onto the side surface of the contact ball.

[0018] The second objective of this invention is to provide a clamping method for a horizontal sawing machine for seamless steel pipes, employing the aforementioned clamping mechanism for the horizontal sawing machine for seamless steel pipes, comprising the following steps:

[0019] S1. Place the steel pipe body to be cut on the feed platform, and make the front end of the steel pipe body enter the positioning cavity between the second fixed clamping plate and the second movable clamping plate.

[0020] S2. Simultaneously activate the positioning clamping drive and the feeding clamping drive via the controller to move the second movable clamping plate toward the second fixed clamping plate, and at the same time move the first movable clamping plate toward the first fixed clamping plate.

[0021] S3. Under the action of the elastic element, the multiple contact parts on the second fixed clamping plate and the second movable clamping plate generate different amounts of expansion and contraction according to the arc of the outer contour of the steel pipe body. The contact balls at the ends of each contact part are in contact with the surface of the steel pipe, realizing adaptive and uniform clamping of the front end of the steel pipe body and completing the overall positioning of the steel pipe body.

[0022] S4. The sawing tool assembly is started by the controller to perform sawing. During the sawing process, the rear feed clamping assembly clamps the steel pipe body and feeds it forward along the feed track. The front positioning clamping assembly maintains the clamping state of the steel pipe body. The rolling contact of the contact balls achieves low friction guidance of the steel pipe body. The front positioning clamping assembly does not need to be released during the feeding process. At the same time, during the clamping process of the steel pipe body, the front positioning clamping assembly reflects the flatness of the steel pipe body surface through the difference in the extension and retraction of each contact part.

[0023] S5. After sawing is completed, the positioning clamping drive and the feeding clamping drive are started by the controller. The contact part is reset under the action of the elastic part. The rear feed clamping assembly returns to the starting position along the feed track, ready for the next clamping and sawing cycle.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1. In the clamping mechanism and method of the seamless steel pipe horizontal saw, when the front-end positioning and clamping component starts to clamp the steel pipe body, each contact part can adaptively extend and retract to press against the arc-shaped outer wall of the steel pipe during the clamping process, realizing multi-point flexible clamping, and there is no need to release the clamping force during feeding; after the clamping is in place, the end of the contact part facing the positioning cavity can fill the suspended gap formed at the upper and lower ends of the side of the steel pipe when the traditional flat plate clamps the round pipe, so that the clamping force is evenly distributed along the circumference of the steel pipe, reducing the local extrusion stress of the seamless steel pipe wall and improving the clamping stability during the sawing process.

[0026] 2. In the clamping mechanism and method of this seamless steel pipe horizontal sawing machine, during the clamping operation, the contact parts will show corresponding differentiated extension and contraction lengths according to the arc cross-sectional contour of the steel pipe body. In the qualified and flat steel pipe body, the extension and contraction lengths of the contact parts at the same horizontal position are consistent. When a single contact part shows abnormal extension or abnormal contraction, it can be intuitively judged that there are uneven defects such as protrusions and depressions on the surface of the steel pipe at the corresponding position. It can quickly assist the staff to mark the defect positions on site and speed up the subsequent defect sorting, repair and overall processing progress. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a structural diagram showing the installation position of the clamping structure in this invention;

[0029] Figure 3 This is a front view of the entire invention;

[0030] Figure 4 This is a schematic diagram of the sawing tool assembly in this invention;

[0031] Figure 5This is a diagram showing the clamping state of the clamping structure on the steel pipe body in this invention;

[0032] Figure 6 This is a cross-sectional view of the steel pipe body being clamped by the rear feed clamping assembly in this invention;

[0033] Figure 7 This is a schematic diagram of the front-end positioning and clamping component in this invention;

[0034] Figure 8 This is a schematic diagram of the contact element in this invention;

[0035] Figure 9 This is a schematic diagram of the connection structure between the contact element and the front-end positioning and clamping assembly in this invention.

[0036] Figure 10 This is a diagram illustrating the clamping process of the front-end positioning and clamping component on the steel pipe body in this invention.

[0037] The meanings of the labels in the diagram are as follows:

[0038] 1. Sawing machine body; 10. Clamping mechanism; 11. Sawing tool assembly; 111. Saw blade; 12. Bed base; 13. Controller; 14. Sawing platform; 15. Feed platform;

[0039] 21. Rear feed clamping assembly; 22. Front positioning clamping assembly; 23. Auxiliary clamping mechanism;

[0040] 211. First fixed clamping plate; 212. First movable clamping plate; 213. Feeding clamping drive component; 214. Feeding track;

[0041] 221. Clamping seat; 222. Second fixed clamping plate; 223. Second movable clamping plate; 224. Positioning and clamping drive component; 225. Positioning cavity; 231. Central hole; 232. Contact component; 233. Contact ball; 234. Limiting ring; 235. Sealing ring;

[0042] 241. Lateral rail groove; 242. Slider; 243. Elastic element. Detailed Implementation

[0043] The technical solutions in 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.

[0044] Example 1: Please refer to Figures 1-3As shown, the purpose of this embodiment is to provide a clamping mechanism for a seamless steel pipe horizontal sawing machine, including a clamping mechanism 10. The clamping mechanism 10 is assembled on the sawing machine body 1. The sawing machine body 1 includes a bed base 12. A feed platform 15 is formed on the surface of the bed base 12. The front end of the feed platform 15 is connected to the sawing platform 14.

[0045] like Figure 4 As shown, a sawing tool assembly 11 is provided at the top of the connection between the feed platform 15 and the sawing platform 14. The sawing tool assembly 11 includes a saw blade 111. A controller 13 is installed at the end of the bed base 12. The controller 13 is electrically connected to the sawing tool assembly 11 and the clamping mechanism 10 to uniformly and collaboratively control the sawing, clamping and feeding actions to ensure a stable and orderly operation sequence.

[0046] The clamping mechanism 10 includes a rear feed clamping assembly 21 for clamping and fixing the steel pipe body and a front positioning clamping assembly 22. The front positioning clamping assembly 22 is provided with an auxiliary clamping mechanism 23. During sawing, the auxiliary clamping mechanism 23 is in multi-point contact with the surface of the steel pipe body, forming a uniform clamping of the steel pipe body, reducing the problems of poor contact and stress concentration in traditional flat plate rigid clamping, and reducing the risk of indentation deformation of thin-walled seamless steel pipe.

[0047] During feeding, the rear feed clamping assembly 21 clamps the steel pipe body and feeds it forward. The auxiliary clamping mechanism 23 maintains low-friction guidance on the steel pipe body through rolling contact, so that the front positioning clamping assembly 22 remains in a clamping state during the feeding process without loosening, thereby avoiding cumulative squeezing damage caused by repeated opening and closing of the front clamping assembly. At the same time, during the clamping process of the steel pipe body, the front positioning clamping assembly 22 can reflect the flatness of the steel pipe body surface through the amount of expansion and contraction, realizing the integration of clamping and surface quality inspection.

[0048] As is well known to those skilled in the art, the operating principle of the above-mentioned saw body 1 is as follows: the sawing tool assembly 11 is driven by external power to drive the saw blade 111 to perform cyclic reciprocating cutting motion, thereby cutting and removing the steel pipe body by the saw blade 111 to achieve the steel pipe sawing operation; the whole equipment is electrically centrally controlled by the controller 13, which is electrically connected to the sawing tool assembly 11 and the clamping mechanism 10 respectively, and drives and controls the clamping mechanism 10 to open and close clamping, feed material, and the sawing tool assembly 11 to descend sawing action in sequence according to the preset processing sequence.

[0049] See Figure 5 and combined Figure 6As shown, the feed rail 214 of the rear feed clamping assembly 21 is fixedly installed on the surface of the feed platform 15 to provide stable guidance for the sliding feed of the entire assembly. A base is slidably mounted on the surface of the feed rail 214. The base can drive the components on it to move synchronously along the feed rail 214. Specifically, a first fixed clamping plate 211 is fixedly installed at one end of the base as a fixed end for clamping the steel pipe body. A feeding clamping drive 213 (a cylinder structure can be selected) is fixedly provided at the other end of the base. The movable end of the feeding clamping drive 213 is fixedly connected to the first movable clamping plate 212 to form a movable clamping end.

[0050] During operation, the feeding clamping drive 213 generates driving force, which drives the first movable clamping plate 212 to move toward the first fixed clamping plate 211 (the moving distance can be controlled by the diameter of the steel pipe body being clamped), until it cooperates with the first fixed clamping plate 211 to clamp the steel pipe body. After clamping, the base can drive the entire clamped assembly to slide along the feed rail 214 toward the sawing platform 14, thereby realizing the feeding of the steel pipe body toward the sawing tool assembly 11 and providing feeding support for the sawing operation.

[0051] See Figure 5 and combined Figure 7 As shown, the clamping seat 221 of the front-end positioning clamping assembly 22 is set at the connection between the sawing platform 14 and the feed platform 15. A second fixed clamping plate 222 is fixedly installed at one end of the clamping seat 221. The second fixed clamping plate 222 is a fixed reference for clamping the front end of the steel pipe body. A positioning clamping drive 224 (a cylinder structure can be selected) is installed at the other end of the clamping seat 221. The movable end of the positioning clamping drive 224 is connected to the bottom of the second movable clamping plate 223, so that the second movable clamping plate 223 slides on the clamping seat 221 under the action of the positioning clamping drive 224.

[0052] During operation, the positioning and clamping drive 224 is activated, driving the second movable clamping plate 223 to move closer to the second fixed clamping plate 222. At this time, a positioning cavity 225 is formed between the second movable clamping plate 223 and the second fixed clamping plate 222, providing support for the positioning of the front end of the steel pipe during sawing operations.

[0053] Further integration Figure 7 As shown, both the second fixed clamping plate 222 and the second movable clamping plate 223 have multiple central holes 231 in their middle portions. These central holes 231 are evenly distributed in an array on the second fixed clamping plate 222 and the second movable clamping plate 223. Figure 8 and Figure 9 As can be seen, each central hole 231 has a contact element 232 movably installed inside. The contact element 232 is a rod-shaped structure that can move and extend along the axial direction of the central hole 231. Multiple contact elements 232 can jointly form a multi-point elastic contact unit that contacts the surface of the steel pipe body.

[0054] Specifically, each contact 232 has a slider 242 fixedly mounted on its surface inside the central hole 231, which is then combined with... Figure 9 As shown, each central hole 231 has a lateral groove 241 on its inner wall. The slider 242 is slidably assembled inside the lateral groove 241, which guides the extension and retraction direction of the contact 232. At the same time, an elastic element 243 (a spiral spring can be selected) is connected to one side surface of the slider 242. The other end of the elastic element 243 is fixedly connected to the inner wall of the lateral groove 241. The elastic element 243 provides elastic support for the elastic extension and retraction of the contact 232, so that the contact 232 can return to its initial position when no external force is applied.

[0055] To accommodate the contact requirements between the contact element 232 and the steel pipe body, multiple contact elements 232 are movably equipped with contact balls 233 at one end near the positioning cavity 225. The contact balls 233 are made of a composite material with a rigid inner core and a flexible outer core: the core of the contact ball 233 is made of hard alloy material to ensure the structural strength of the contact ball 233 and meet the support requirements during clamping, while the outer layer of the ball is covered with a flexible polyurethane material (the surface must be smooth). This rigid inner core and flexible outer core design allows the contact ball 233 to make flexible contact with the surface of the steel pipe body, reducing frictional damage to the outer wall of the steel pipe during contact. At the same time, the hard core can ensure the smooth rolling of the contact ball 233, and the flexible outer layer can better fit the curved outer wall of the steel pipe, improving the tightness of the contact.

[0056] When the front-end positioning and clamping assembly 22 clamps the steel pipe body, refer to Figure 10 As shown, the positioning and clamping drive 224 drives the second movable clamping plate 223 to move closer to the second fixed clamping plate 222. As the distance between the second movable clamping plate 223 and the second fixed clamping plate 222 gradually decreases, the contact ball 233 of the contact member 232 near the positioning cavity 225 first contacts the outer wall of the steel pipe body. As the clamping force continues to be applied, the contact ball 233 is squeezed by the outer wall of the steel pipe, and the force is transmitted to the contact member 232, causing the contact member 232 to extend and retract along the central hole 231 in the direction away from the positioning cavity 225. At this time, the slider 242 on the surface of the contact member 232 will slide synchronously along the lateral groove 241 on the inner wall of the central hole 231. The elastic member 243 on one side of the slider 242 is squeezed and deformed, generating a reverse elastic force, pushing the contact member 232 to always press against the surface of the steel pipe body.

[0057] Back Figure 8 and Figure 9As can be seen, due to the arc-shaped cross-section of the steel pipe body, the contact element 232 at different positions is subjected to different compressive forces, and the corresponding extension amount of the contact element 232 is also different. The extension amount of the contact element 232 near the middle of the steel pipe body is larger, while the extension amount of the contact element 232 near the upper and lower ends of the steel pipe body is smaller. Until the two clamping plates stop moving and are clamped in place, the contact element 232 maintains its current extension state and continues to press against and adhere to the outer wall of the steel pipe.

[0058] During the clamping process, multiple array-distributed contact elements 232 can elastically expand and contract along the central hole 231. The amount of expansion and contraction is adaptively adjusted according to the arc-shaped outer wall contour of the steel pipe body, so that the contact balls 233 of each contact element 232 can press against the surface of the steel pipe, thereby realizing multi-point flexible clamping of the steel pipe body.

[0059] When the rear feed clamping assembly 21 drives the steel pipe body to feed in the sawing direction, the contact ball 233 at the end of the contact member 232 can roll along the surface of the steel pipe body, converting the sliding friction between the contact member 232 and the steel pipe into rolling friction, reducing the contact friction force. This rolling contact method allows the front positioning clamping assembly 22 to maintain the clamping force on the steel pipe without affecting the axial feed of the steel pipe, thereby achieving the goal of not having to release the clamping force during feeding. Without releasing the clamping force, the steel pipe can always maintain a stable positioning state during the feeding process, reducing the positional deviation of the steel pipe, and at the same time reducing the repeated squeezing of the outer wall of the steel pipe body, reducing the occurrence of indentations on the surface of the steel pipe body.

[0060] When the traditional flat plate clamping mechanism 10 contacts the steel pipe body with a circular cross-section, a gap is formed between the upper and lower ends of the steel pipe side and the flat plate because the flat plate is flat and the outer wall of the steel pipe body is arc-shaped. The array of contact members 232 can adaptively expand and contract according to the arc-shaped contour of the steel pipe body. Some of the contact members 232 near the positioning cavity 225 can extend to the gap, filling the gap formed by the traditional flat plate clamping. After the contact members 232 fill the gap, the clamping force can be transmitted to the steel pipe body through multiple contact points, so that the clamping force is evenly distributed along the circumference of the steel pipe. This changes the situation where the force is concentrated at two points when using traditional flat plate clamping, reduces the local extrusion stress on the seamless steel pipe wall, and makes the pipe wall more uniformly stressed.

[0061] While clamping the steel pipe body, each contact element 232 will exhibit a corresponding differentiated extension length according to the arc-shaped cross-sectional profile of the steel pipe body. For a qualified and flat steel pipe body, the arc-shaped profile at the same horizontal position is consistent, and the corresponding contact element 232 is subjected to the same extrusion force. Therefore, the extension length of the contact element 232 at the same horizontal position is consistent. If there are uneven defects such as protrusions or depressions on the surface of the steel pipe body, the extrusion force on the corresponding contact element 232 will be abnormal, causing the contact element 232 at this position to show obvious abnormal extension or abnormal contraction, forming a significant difference from other contact elements 232 at the same horizontal position. At this time, the staff can intuitively judge the specific location of the uneven defects on the surface of the steel pipe by observing the extension and contraction state of the contact element 232 and mark it on site. This process can reduce the inspection steps and improve the overall processing progress.

[0062] like Figure 9 As shown, each of the central holes 231 on the second fixed clamping plate 222 and the second movable clamping plate 223 is equipped with a sealing ring 235 at the opening end near the positioning cavity 225. The inner diameter of the sealing ring 235 is adapted to the inner diameter of the central hole 231. At the same time, a limiting ring 234 is fixedly fitted on the outer wall of each contact 232 near the contact ball 233. The limiting ring 234 slides and extends synchronously with the contact 232 along the axial direction of the central hole 231. The limiting ring 234 corresponds to the side area of ​​the sealing ring 235 and can fit against the sealing ring 235 during the sliding of the contact 232.

[0063] The sealing ring 235 is arranged at the opening of the central hole 231, which can form a sealing barrier to the internal cavity of the central hole 231, reducing the entry of sawing waste and impurities into the internal space of the central hole 231. The limiting ring 234 is fixedly connected to the outer wall of the contact member 232. During the axial elastic expansion and contraction sliding of the contact member 232, the limiting ring 234 can move to a position where it is in contact with the sealing ring 235, and the two form an axial limiting fit, which constrains the extension stroke of the contact member 232 toward the positioning cavity 225, and maintains the stable assembly connection state of the contact member 232 inside the central hole 231.

[0064] Example 2: This example, based on the content provided in Example 1, aims to provide a clamping method for a horizontal sawing machine for seamless steel pipes. The specific steps are as follows:

[0065] Step 1: Place the steel pipe body to be cut on the feed platform 15, and make the front end of the steel pipe body enter the positioning cavity 225 between the second fixed clamping plate 222 and the second movable clamping plate 223.

[0066] Step 2: Simultaneously activate the positioning clamping drive 224 and the feeding clamping drive 213 via the controller 13, so that the second movable clamping plate 223 moves toward the second fixed clamping plate 222, and at the same time, the first movable clamping plate 212 moves toward the first fixed clamping plate 211.

[0067] Step 3: Under the action of the elastic element 243, the multiple contact elements 232 on the second fixed clamping plate 222 and the second movable clamping plate 223 generate different amounts of expansion and contraction according to the arc of the outer contour of the steel pipe body. The contact balls 233 at the ends of each contact element 232 are in contact with the surface of the steel pipe, realizing adaptive and uniform clamping of the front end of the steel pipe body, and completing the overall positioning of the steel pipe body.

[0068] Step 4: Start the sawing tool assembly 11 through the controller 13 to perform sawing. During the sawing process, the rear feed clamping assembly 21 clamps the steel pipe body and feeds it forward along the feed track 214. The front positioning clamping assembly 22 maintains the clamping state of the steel pipe body. The rolling contact of the contact ball 233 achieves low friction guidance of the steel pipe body. The front positioning clamping assembly 22 does not need to be released during the feeding process. At the same time, during the clamping process of the front positioning clamping assembly 22, the difference in the extension and retraction of each contact element 232 reflects the flatness of the surface of the steel pipe body.

[0069] Step 5: After sawing is completed, the positioning clamping drive 224 and the feeding clamping drive 213 are started by the controller 13. The contact 232 is reset under the action of the elastic element 243. The rear feed clamping assembly 21 retracts to the starting position along the feed track 214, ready for the next clamping and sawing cycle.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping mechanism for a seamless steel pipe horizontal sawing machine, comprising a clamping mechanism (10), the clamping mechanism (10) being mounted on a sawing machine body (1), the sawing machine body (1) comprising a bed base (12), a feed platform (15) being formed on the surface of the bed base (12), the front end of the feed platform (15) being connected to a sawing platform (14), characterized in that: A sawing tool assembly (11) is provided at the top of the connection between the feed platform (15) and the sawing platform (14). The sawing tool assembly (11) includes a saw blade (111). A controller (13) is installed at the end of the bed base (12). The controller (13) is electrically connected to the sawing tool assembly (11) and the clamping mechanism (10). The clamping mechanism (10) includes a rear feed clamping assembly (21) for clamping and fixing the steel pipe body and a front positioning clamping assembly (22). The front positioning clamping assembly (22) is provided with an auxiliary clamping mechanism (23). During sawing, the auxiliary clamping mechanism (23) is attached to the surface of the steel pipe body at multiple points to form a uniform clamping of the steel pipe body. During feeding, the rear feed clamping assembly (21) clamps the steel pipe body and feeds it forward. The auxiliary clamping mechanism (23) maintains low friction guidance on the steel pipe body through rolling contact, so that the front positioning clamping assembly (22) remains in a clamping state during feeding without loosening. At the same time, the front positioning clamping assembly (22) can reflect the flatness of the steel pipe body surface through the amount of extension and retraction during the clamping process.

2. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 1, characterized in that: The rear feed clamping assembly (21) includes a feed rail (214) mounted on the surface of the feed platform (15). A base is slidably disposed on the surface of the feed rail (214). A first fixed clamping plate (211) is fixedly mounted on one end of the base, and a feeding clamping drive (213) is fixed on the other end of the base. The movable end of the feeding clamping drive (213) is connected to a first movable clamping plate (212). The feeding clamping drive (213) can drive the first movable clamping plate (212) to move toward the first fixed clamping plate (211) to clamp the steel pipe body and feed it along the feed rail (214) in the sawing direction.

3. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 1, characterized in that: The front-end positioning and clamping assembly (22) includes a clamp (221) disposed between the sawing platform (14) and the feed platform (15). A second fixed clamp (222) is fixedly installed at one end of the clamp (221). A positioning and clamping drive (224) is installed at the end of the clamp (221) away from the second fixed clamp (222). The movable end of the positioning and clamping drive (224) is connected to the second movable clamp (223). The positioning and clamping drive (224) can drive the second movable clamp (223) to move closer to the second fixed clamp (222) to form a positioning cavity (225) for positioning and clamping the front end of the steel pipe body.

4. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 3, characterized in that: The auxiliary clamping mechanism (23) includes a plurality of central holes (231) formed in the middle of the second fixed clamping plate (222) and the second movable clamping plate (223). The plurality of central holes (231) are arranged in an array on the second fixed clamping plate (222) and the second movable clamping plate (223). Each central hole (231) is movably provided with a contact element (232). The contact element (232) is a rod-shaped structure and can elastically extend and retract along the axial direction of the central hole (231) to form a multi-point elastic contact unit.

5. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 4, characterized in that: Each of the contact elements (232) has a contact ball (233) movably disposed at one end near the positioning cavity (225), and the multiple contact balls (233) are all of the inner rigid and outer flexible structure.

6. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 5, characterized in that: Each of the contact elements (232) has a slider (242) fixedly installed on its surface inside the central hole (231). Each of the central holes (231) has a lateral groove (241) on its inner wall, and the slider (242) is slidably disposed inside the lateral groove (241).

7. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 6, characterized in that: One side surface of the slider (242) is connected to an elastic element (243), and the other end of the elastic element (243) is connected to the inner wall of the lateral rail groove (241). During the clamping process, each contact element (232) generates different amounts of expansion and contraction according to the arc contour of the steel pipe body surface.

8. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 4, characterized in that: Each central hole (231) on the second fixed clamping plate (222) and the second movable clamping plate (223) is fitted with a sealing ring (235) near the opening of the positioning cavity (225), and the inner diameter of the sealing ring (235) is adapted to the inner diameter of the central hole (231).

9. The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 5, characterized in that: Each of the contact elements (232) has a locating ring (234) fixedly fitted on the side surface of the contact ball (233).

10. A clamping method for a horizontal sawing machine for seamless steel pipes, characterized in that, The clamping mechanism of the seamless steel pipe horizontal sawing machine according to claim 7 includes the following steps: S1. Place the steel pipe body to be cut on the feed platform (15) and make the front end of the steel pipe body enter the positioning cavity (225) between the second fixed clamping plate (222) and the second movable clamping plate (223). S2. The positioning clamping drive (224) and the feeding clamping drive (213) are activated simultaneously by the controller (13) to make the second movable clamping plate (223) move toward the second fixed clamping plate (222) and at the same time make the first movable clamping plate (212) move toward the first fixed clamping plate (211). S3. Under the action of the elastic element (243), the multiple contact elements (232) on the second fixed clamping plate (222) and the second movable clamping plate (223) generate different amounts of expansion and contraction according to the arc of the outer contour of the steel pipe body. The contact balls (233) at the ends of each contact element (232) are in contact with the surface of the steel pipe, realizing adaptive and uniform clamping of the front end of the steel pipe body, and completing the overall positioning of the steel pipe body. S4. The sawing tool assembly (11) is started by the controller (13) to perform sawing. During the sawing process, the rear feed clamping assembly (21) clamps the steel pipe body and feeds forward along the feed track (214). The front positioning clamping assembly (22) maintains the clamping state of the steel pipe body. The low friction guidance of the steel pipe body is achieved by the rolling contact of the contact ball (233). The front positioning clamping assembly (22) does not need to be released during the feeding process. At the same time, during the clamping process of the steel pipe body, the front positioning clamping assembly (22) reflects the flatness state of the steel pipe body surface through the difference in the extension and retraction of each contact part (232). S5. After sawing is completed, the positioning clamping drive (224) and the feeding clamping drive (213) are started by the controller (13). The contact (232) is reset under the action of the elastic element (243). The rear feed clamping assembly (21) returns to the starting position along the feed track (214) to prepare for the next clamping and sawing cycle.

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