Quick die changing device for cold rolling of small-diameter seamless steel pipe

Abstract

The utility model relates to the related technical field of steel pipe processing, in particular to a quick die changing device for cold rolling of small-diameter seamless steel pipes, which comprises a changing platform, and a changing device is arranged on the surface of a support. According to the rapid die changing device for cold rolling of the small-diameter seamless steel pipe, the motor drives the rotating shaft and the threaded rod to rotate synchronously, the auxiliary rod is matched with the threaded rod in the sliding groove of the cross beam to make the sliding block move linearly in the axial direction of the threaded rod, the sliding block is accurately moved to the position over a to-be-changed die by controlling the motor, and after the sliding block is in place, the air cylinder is started; a push rod drives a first rack to move downwards and drives a second rack to move, a rotating shaft and a fixed shaft provide supporting and guiding for the second rack and a rotating rod correspondingly, the rotating shaft and the fixed shaft drive a clamping plate to be opened and closed, the clamping plate descends to open and clamp a mold, an air cylinder enables the push rod to ascend to lift the mold, a motor moves a sliding block to the position above a new mold containing platform, and an old mold is put down. And the operation is repeated to clamp a new mold and move the new mold to the replacement platform, mold replacement is completed, and rapid and accurate mold replacement is achieved.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe processing technology, and in particular to a quick mold changing device for cold rolling of small-diameter seamless steel pipes. Background Technology

[0002] Steel pipe processing is a process of treating metal pipes. By using various processing methods such as cutting, bending, welding, and surface treatment on steel pipes of various materials, such as carbon steel and stainless steel, their shape, size, performance, or surface characteristics can be changed to meet the needs of different industries and scenarios. In the construction field, processed steel pipes can be used to build scaffolding and structural supports. However, in the cold rolling process of small-diameter seamless steel pipes, the molds need to be replaced regularly due to wear and other reasons. Therefore, a quick mold changing device for cold rolling small-diameter seamless steel pipes is particularly needed.

[0003] However, traditional mold-changing methods are time-consuming and lack precise positioning and calibration mechanisms. After each mold change, the installation accuracy of the mold is difficult to guarantee, resulting in large fluctuations in the dimensional accuracy and surface quality of small-diameter seamless steel pipes, and an increased defect rate. This not only wastes raw materials but also increases the cost of quality inspection and rework. At the same time, due to the uncertainty of mold-changing time, it is difficult to achieve standardized and regulated management of the production process, which is not conducive to improving the overall production efficiency and quality of enterprises. Utility Model Content

[0004] The purpose of this invention is to provide a quick mold changing device for cold rolling of small-diameter seamless steel pipes, which has the function of automatically changing molds and solves the problem of low production efficiency caused by long time consumption of traditional mold changing methods.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a quick mold changing device for cold rolling of small-diameter seamless steel pipes, comprising a changing platform, a new mold placement platform fixedly connected to one end of the changing platform, support legs installed at the bottom of both the changing platform and the new mold placement platform, a bracket fixedly connected above the changing platform and the new mold placement platform, a changing device provided on the surface of the bracket, and a positioning and engaging mechanism provided above the changing platform;

[0006] The replacement device includes a crossbeam, a slide groove, a motor housing, a drive motor, a rotating shaft, a threaded rod, an auxiliary rod, a slider, a cylinder, a push rod, a housing, a first rack, a second rack, a rotating shaft, a fixed shaft, a rotating rod, a coupling, and a clamping plate. A crossbeam is fixedly connected to the inner side of the support. A slide groove is formed at the bottom of the crossbeam. A motor housing is fixedly connected to one end of the support. A drive motor is installed inside the motor housing. A rotating shaft is fixedly connected to the output end of the drive motor. A threaded rod is fixedly connected to one end of the rotating shaft. An auxiliary rod is fixedly connected inside the slide groove. The threaded rod and the auxiliary rod... The rod has sliders slidably connected to its surface. A cylinder is fixedly connected to the bottom of each slider. A push rod is slidably connected inside the cylinder. A housing is fixedly connected to the outer wall of the cylinder. A first rack is fixedly connected to the bottom of the push rod. A second rack meshes with both ends of the first rack. A rotating shaft passes through the inside of the second rack. The rotating shaft is rotatably connected to the inside of the housing. A fixed shaft is fixedly connected inside the housing. A rotating rod is rotatably connected to the surface of the fixed shaft. A coupling is connected to the bottom of both the second rack and the rotating rod. A clamping plate is fixedly connected to the inside of the coupling.

[0007] Preferably, multiple sets of the support legs are provided at the bottom of the replacement platform and the new mold placement platform, and are respectively distributed at the four corners of the bottom of the replacement platform and the new mold placement platform.

[0008] Preferably, the slide is provided in two sets on the surface of the crossbeam, and one set is rotatably connected to a threaded rod, while the other set is fixedly connected to an auxiliary rod.

[0009] Preferably, the position of the slider corresponds to the position of the groove, and the outer wall size of the slider matches the inner wall size of the groove.

[0010] Preferably, the positioning and engaging mechanism includes a tray, a telescopic groove, a telescopic spring, a locking block, a chassis, a locking groove, and a clamp. The upper surface of the replacement platform is fixedly connected to the tray, the bottom of the tray with a telescopic groove is fixedly connected to a telescopic spring, the top of the telescopic spring is fixedly connected to a locking block, the upper surface of the tray is engaged with the chassis, the bottom of the chassis has a locking groove, and the upper part of the chassis is fixedly connected to a clamp.

[0011] Preferably, multiple sets of the telescopic springs are arranged inside the telescopic groove, and each set of telescopic springs is distributed at equal intervals.

[0012] Preferably, the card block and the telescopic spring cooperate to form a telescopic structure, and the outer wall size of the card block matches the inner wall size of the card slot.

[0013] Compared with the prior art, this utility model provides a quick mold changing device for cold rolling of small-diameter seamless steel pipes, which has the following beneficial effects: By setting up the changing device, the operator starts the drive motor in the motor housing. The motor drives the rotating shaft and the threaded rod to rotate synchronously. In the crossbeam slide groove, the auxiliary rod cooperates with the threaded rod to make the slider move linearly along the axis of the threaded rod. By controlling the motor, the slider is accurately moved to the top of the mold to be changed. After the slider is in place, the cylinder is started. The push rod drives the first rack to move down. Due to the meshing of the rack, the second rack moves. The rotating shaft and the fixed shaft provide support and guidance for the second rack and the rotating rod, respectively. The two drive the clamping plate to open and close. The clamping plate descends to open and clamp the mold. The cylinder causes the push rod to rise and lift the mold. The motor moves the slider to the top of the new mold placement platform, puts down the old mold, and repeats the operation to clamp the new mold and move it to the changing platform to complete the mold changing, realizing quick and accurate mold changing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the left side view of the appearance of this utility model;

[0015] Figure 2 This is a schematic diagram of the right side view of the appearance of this utility model;

[0016] Figure 3 This is a schematic diagram of the replacement device structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the positioning and engaging mechanism of this utility model.

[0018] In the diagram: 1. Replacement platform; 2. New mold placement platform; 3. Support leg; 4. Bracket; 5. Replacement device; 501. Crossbeam; 502. Slide groove; 503. Motor housing; 504. Drive motor; 505. Rotating shaft; 506. Threaded rod; 507. Auxiliary rod; 508. Slider; 509. Cylinder; 510. Push rod; 511. Outer shell; 512. First rack; 513. Second rack; 514. Rotating shaft; 515. Fixed shaft; 516. Rotating rod; 517. Coupling; 518. Clamping plate; 6. Positioning and locking mechanism; 601. Pallet; 602. Telescopic groove; 603. Telescopic spring; 604. Locking block; 605. Chassis; 606. Locking slot; 607. Fixture. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a quick mold changing device for cold rolling of small diameter seamless steel pipes, including a changing platform 1, a new mold placement platform 2 fixedly connected to one end of the changing platform 1, support legs 3 installed at the bottom of both the changing platform 1 and the new mold placement platform 2, a bracket 4 fixedly connected above the changing platform 1 and the new mold placement platform 2, a changing device 5 provided on the surface of the bracket 4, and a positioning and locking mechanism 6 provided above the changing platform 1;

[0021] The replacement device 5 includes a crossbeam 501, a slide 502, a motor housing 503, a drive motor 504, a rotating shaft 505, a threaded rod 506, an auxiliary rod 507, a slider 508, a cylinder 509, a push rod 510, a housing 511, a first rack 512, a second rack 513, a rotating shaft 514, a fixed shaft 515, a rotating rod 516, a coupling 517, and a clamping plate 518. The crossbeam 501 is fixedly connected to the inner side of the support 4. A slide 502 is provided at the bottom of the crossbeam 501. The motor housing 503 is fixedly connected to one end of the support 4. The drive motor 504 is installed inside the motor housing 503. The output end of the drive motor 504 is fixedly connected to the rotating shaft 505. A threaded rod 506 is fixedly connected to one end of the rotating shaft 505. 6. An auxiliary rod 507 is fixedly connected inside the slide groove 502. A slider 508 is slidably connected to both the threaded rod 506 and the auxiliary rod 507. A cylinder 509 is fixedly connected to the bottom of the slider 508. A push rod 510 is slidably connected inside the cylinder 509. A housing 511 is fixedly connected to the outer wall surface of the cylinder 509. A first rack 512 is fixedly connected to the bottom of the push rod 510. A second rack 513 meshes with both ends of the first rack 512. A rotating shaft 514 passes through the interior of the second rack 513. The rotating shaft 514 is rotatably connected to the inner side of the housing 511. A fixed shaft 515 is fixedly connected inside the housing 511. A rotating rod 516 is rotatably connected to the surface of the fixed shaft 515. The second rack 513 and the rotating rod 516... The bottom of each of the six components is connected to a coupling 517. A clamping plate 518 is fixedly connected to the inner side of the coupling 517. Through the setting of the replacement device 5, when it is necessary to replace the cold rolling die for small-diameter seamless steel pipes, the replacement device 5 begins to play its important role. The operator first starts the drive motor 504 inside the motor housing 503. The output end of the drive motor 504 drives the rotating shaft 505 to start rotating. Since one end of the rotating shaft 505 is fixedly connected to the threaded rod 506, the threaded rod 506 will rotate synchronously with the rotating shaft 505. In the slide groove 502 at the bottom of the crossbeam 501, the auxiliary rod 507 works together with the threaded rod 506. When the threaded rod 506 rotates, the slider 508 slidably connected to its surface will move along the thread under the transmission action of the thread. The threaded rod 506 moves axially, while the auxiliary rod 507 stabilizes the movement trajectory of the slider 508, ensuring that the slider 508 can only move linearly within the groove 502. By controlling the forward and reverse rotation and the running time of the drive motor 504, the slider 508 can be precisely moved to the top of the mold to be replaced. When the slider 508 reaches the designated position, the operator activates the cylinder 509. The push rod 510 inside the cylinder 509 begins to slide downward under the action of air pressure. The first rack 512, which is fixedly connected to the bottom of the push rod 510, also moves downward. Since the two ends of the first rack 512 mesh with the second rack 513, when the first rack 512 moves downward, it will drive the meshing second rack 513 to move relative to it.The rotating shaft 514, which passes through the interior of the second rack 513, rotates inside the housing 511, providing support and guidance for the movement of the second rack 513. Simultaneously, the rotating rod 516, rotatably connected to the surface of the fixed shaft 515 fixed inside the housing 511, also rotates with the movement of the second rack 513. The bottoms of both the second rack 513 and the rotating rod 516 are connected to the clamping plate 518 via a coupling 517. During the movement of the second rack 513 driven by the first rack 512, the rotating rod 516 also moves accordingly, allowing the clamping plate 518 to open and close as needed. When the clamping plate 518 descends to the appropriate position and opens, it can accurately... The old mold to be replaced is securely clamped. Then, the operator controls cylinder 509 to raise push rod 510, thereby lifting the mold. The drive motor 504 is then restarted, moving slider 508, which holds the mold, above the new mold placement platform 2. Through the cooperation of cylinder 509 and clamping plate 518, the old mold is placed on the new mold placement platform 2. This process is repeated, with the new mold being clamped again on mold placement platform 2 and moved to the appropriate installation position on replacement platform 1, completing the mold replacement. The entire replacement process, through the coordinated work of drive motor 504, cylinder 509, and other components, achieves a fast and precise mold replacement operation.

[0022] Furthermore, multiple sets of support legs 3 are installed at the bottom of the replacement platform 1 and the new mold placement platform 2, respectively distributed at the four corners of the bottom of the replacement platform 1 and the new mold placement platform 2. The support legs 3 provide a stable support foundation for the entire quick mold changing device. During the mold changing process, the clamping device needs to move heavy molds, which will generate greater force and vibration. The support legs 3 are evenly distributed at the four corners of the bottom, which can evenly distribute these forces to the ground, ensuring that the replacement platform 1 and the new mold placement platform 2 always remain stable, avoiding the tilting or shaking of the platform due to uneven force, ensuring the safety and stability of the mold changing work, and also extending the service life of the equipment.

[0023] Furthermore, the slide groove 502 has two sets on the surface of the crossbeam 501, one set of which is rotatably connected to a threaded rod 506, and the other set is fixedly connected to an auxiliary rod 507. Through the arrangement of the slide groove 502 and the auxiliary rod 507, precise guidance and stable support for the movement of the slider 508 are achieved. When the drive motor 504 drives the threaded rod 506 to rotate, the slider 508 moves under the threaded transmission of the threaded rod 506. The auxiliary rod 507 is arranged parallel to the threaded rod 506, providing an additional support point for the slider 508, preventing the slider 508 from deviating or shaking due to uneven force during movement, ensuring that the slider 508 can move stably along the predetermined straight trajectory, thereby ensuring that the clamping device can accurately reach the position of the mold, improving the accuracy and efficiency of mold replacement.

[0024] Furthermore, the position of the slider 508 corresponds to the position of the groove 502, and the outer wall size of the slider 508 matches the inner wall size of the groove 502. Through the setting of the groove 502 and the slider 508, the movement path of the slider 508 is strictly limited. The close fit design ensures that the slider 508 can only slide in a specific direction within the groove 502, eliminating abnormal situations such as jamming or derailment during the movement of the slider 508. This precise fit ensures the reliability of the replacement device during operation, enabling the entire mold replacement operation to proceed smoothly, and providing a strong guarantee for the rapid and efficient replacement of small-diameter seamless steel pipe cold rolling molds.

[0025] Furthermore, the positioning and engaging mechanism 6 includes a tray 601, a telescopic groove 602, a telescopic spring 603, a locking block 604, a base 605, a locking slot 606, and a clamp 607. The tray 601 is fixedly connected to the upper surface of the changing platform 1. The bottom of the telescopic groove 602 on the surface of the tray 601 is fixedly connected to the telescopic spring 603. The top of the telescopic spring 603 is fixedly connected to the locking block 604. The base 605 is engaged and connected to the upper surface of the tray 601. The bottom of the base 605 has a locking slot 606, and the clamp 607 is fixedly connected to the top of the base 605. Through the arrangement of the positioning and engaging mechanism 6, when the changing device 5 transports the new mold onto the changing platform 1, the positioning and engaging mechanism 6 begins to perform its precise positioning and stable locking function. The key function of the replacement device 5 is to accurately place the base 605 below the mold onto the tray 601. During placement, the slot 606 on the bottom of the base 605 gradually approaches the locking block 604 in the telescopic groove 602 on the surface of the tray 601. Since the locking block 604 is in an upward pop-out state under the action of the telescopic spring 603, as the base 605 and the tray 601 gradually come into contact, the base 605 will exert downward pressure on the locking block 604. As the pressure increases, the telescopic spring 603 begins to be compressed, and the locking block 604 will gradually retract into the telescopic groove 602. When the base 605 is completely placed on the tray 601 and the slot 606 moves to a position directly opposite the locking block 604, the telescopic spring 603, due to its own elasticity... The restoring force quickly ejects the locking block 604 upwards, allowing it to accurately engage in the slot 606. This tight engagement between the locking block 604 and the slot 606 achieves precise positioning between the chassis 605 and the pallet 601. This positioning method ensures the chassis 605 is accurately positioned on the pallet 601, thus guaranteeing that the fixture 607 mounted above the chassis 605 is in the correct working position. This allows the mold to accurately cooperate with other equipment during subsequent cold rolling operations. Simultaneously, the engagement between the locking block 604 and the slot 606 provides a strong engaging force. The telescopic spring 603 continuously applies an upward elastic force to the locking block 604, ensuring it is firmly locked in the slot 606 and preventing damage to the chassis 605 due to vibration or stress during cold rolling. Displacement or shaking may occur due to various factors. Therefore, the clamp 607 can stably fix the mold, ensuring its stability during the cold rolling of small-diameter seamless steel pipes. This improves the stability of the production process and product quality. When mold replacement is needed, the operator can apply downward pressure to the locking block 604 using a specific tool or device. This causes the locking block 604 to compress the telescopic spring 603 and disengage from the slot 606. At this point, the replacement device 5 can easily remove the chassis 605 along with the mold from the pallet 601, preparing for the next mold replacement operation. The entire positioning and locking mechanism 6, through the coordinated work of the locking block 604, telescopic spring 603, and slot 606, achieves rapid mold positioning, stable locking, and convenient disassembly.This improved the efficiency and precision of die changing during the cold rolling process of small-diameter seamless steel pipes.

[0026] Furthermore, multiple sets of telescopic springs 603 are arranged inside the telescopic groove 602, and each set of telescopic springs 603 is evenly distributed. The arrangement of the telescopic springs 603 ensures the stability and balance of the locking block 604 during the telescopic process. During mold installation, the evenly distributed telescopic springs 603 can evenly bear the downward force of the chassis 605, allowing the locking block 604 to retract smoothly into the telescopic groove 602. When the chassis 605 is in place and the locking groove 606 is aligned with the locking block 604, the multiple sets of telescopic springs 603 exert force simultaneously, quickly and stably popping the locking block 604 into the locking groove 606. This avoids the locking block 604 from tilting due to uneven force, ensuring the reliability of the positioning and locking, and also enhancing the stability of the mold during the cold rolling process, effectively preventing the mold from shifting due to unstable locking.

[0027] Furthermore, the locking block 604 and the telescopic spring 603 cooperate to form a telescopic structure. The outer wall size of the locking block 604 matches the inner wall size of the locking groove 606. Through the setting of the locking block 604 and the locking groove 606, the precise positioning and firm locking of the mold base 605 are achieved. The precise dimensional matching of the two ensures that when the base 605 is installed on the pallet 601, the locking block 604 can accurately embed into the locking groove 606, precisely limiting the position of the base 605 and ensuring the positional accuracy of the mold during cold rolling. The tight locking relationship, coupled with the continuous elastic force provided by the telescopic spring 603, makes the base 605 firmly fixed. When cold rolling small-diameter seamless steel pipes, even if the equipment generates large vibrations and forces, the mold can remain stable, which greatly improves the stability of the production process and product quality. At the same time, this structural design also facilitates the disassembly of the mold. It is only necessary to overcome the elastic force of the telescopic spring 603 to disengage the locking block 604 from the locking groove 606, and the mold can be quickly removed.

[0028] Working Principle: After the die replacement is completed, the cold rolling equipment can begin the cold rolling of small-diameter seamless steel pipes. At this time, the die installed on the replacement platform 1 is tightly fixed to the base 605 by the positioning and locking mechanism 6, and the clamp 607 also firmly locks the die, ensuring that the die remains stable during the cold rolling process. The small-diameter seamless steel pipe is transported to the die position. The shape and size of the die determine the specifications of the steel pipe after cold rolling. During the cold rolling process, due to the precise positioning and stable locking of the positioning and locking mechanism 6, the die can accurately perform the rolling operation on the steel pipe, ensuring the dimensional accuracy and surface quality of the steel pipe. After a batch of small-diameter seamless steel pipes is cold rolled, if it is necessary to change to a die of different specifications to produce steel pipes of other specifications, the operator restarts the process. The automatic replacement device 5 first applies downward pressure to the locking block 604 in the positioning and locking mechanism 6 using a specific tool or device, causing the locking block 604 to compress the telescopic spring 603 and disengage from the locking slot 606, thus releasing the engagement between the chassis 605 and the tray 601. Next, the operator starts the drive motor 504 inside the motor housing 503. The drive motor 504 drives the rotating shaft 505 and the threaded rod 506 to rotate, moving the slider 508 above the old mold. The cylinder 509 is then activated, and the push rod 510 drives the first rack 512 to descend. Through the meshing of the first rack 512 and the second rack 513, the clamping plate 518 opens and descends to a suitable position, clamping the old mold. Finally, the cylinder 509 is controlled to raise the push rod 510, removing the old mold. The device is lifted, and the drive motor 504 is restarted. The slider 508, which holds the old mold, is moved above the new mold placement platform 2. Through the cooperation of the cylinder 509 and the clamping plate 518, the old mold is placed on the new mold placement platform 2. Then, the clamping operation is repeated to clamp the new mold on the mold placement platform 2 again and move it above the tray 601 on the replacement platform 1. When the base 605 under the new mold contacts the tray 601, the base 605 presses down on the locking block 604, causing it to retract into the telescopic groove 602. When the base 605 is fully in place, the slot 606 aligns with the locking block 604, and the telescopic spring 603 pops the locking block 604 out and locks it into the slot 606, completing the positioning and locking of the new mold. The entire device is completed by changing the device. The coordinated operation of components 5, 6, and others enables rapid die changing for cold rolling of small-diameter seamless steel pipes, ensuring efficient and stable cold rolling operations. This meets the needs of producing small-diameter seamless steel pipes of different specifications, improves production efficiency and product quality, and reduces production costs. In actual production, operators can adjust the operating parameters of the drive motor 504 and cylinder 509 according to production conditions to further optimize the die changing process and improve the overall performance of the equipment. The drive motor 504 is model Y315S-2, and the cylinder 509 is model SU63-100. This completes the process of using a rapid die changing device for cold rolling of small-diameter seamless steel pipes.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick die-changing device for cold rolling of small-diameter seamless steel pipes, comprising a changing platform (1), characterized in that: One end of the replacement platform (1) is fixedly connected to the new mold placement platform (2). Support legs (3) are installed at the bottom of both the replacement platform (1) and the new mold placement platform (2). A bracket (4) is fixedly connected above the replacement platform (1) and the new mold placement platform (2). A replacement device (5) is provided on the surface of the bracket (4). A positioning and locking mechanism (6) is provided above the replacement platform (1). The replacement device (5) includes a crossbeam (501), a slide groove (502), a motor housing (503), a drive motor (504), a rotating shaft (505), a threaded rod (506), an auxiliary rod (507), a slider (508), a cylinder (509), a push rod (510), a housing (511), a first rack (512), a second rack (513), a rotating shaft (514), a fixed shaft (515), a rotating rod (516), a coupling (517), and a clamping plate (518). A crossbeam (501) is fixedly connected to the inner side of the bracket (4). A groove (502) is provided at the bottom of the crossbeam (501). A motor housing (503) is fixedly connected to one end of the bracket (4). A drive motor (504) is installed inside the motor housing (503). A rotating shaft (505) is fixedly connected to the output end of the drive motor (504). A threaded rod (506) is fixedly connected to one end of the rotating shaft (505). An auxiliary [device] is fixedly connected inside the groove (502). The rod (507) and the threaded rod (506) are both slidably connected to the surfaces of the auxiliary rod (507) and the slider (508). The bottom of the slider (508) is fixedly connected to the cylinder (509). The inside of the cylinder (509) is slidably connected to the push rod (510). The outer wall surface of the cylinder (509) is fixedly connected to the outer shell (511). The bottom of the push rod (510) is fixedly connected to the first rack (512). The two ends of the first rack (512) are engaged with the second rack (51). 3) A rotating shaft (514) passes through the interior of the second rack (513). The rotating shaft (514) is rotatably connected to the inside of the outer shell (511). A fixed shaft (515) is fixedly connected inside the outer shell (511). A rotating rod (516) is rotatably connected to the surface of the fixed shaft (515). A coupling (517) is connected to the bottom of both the second rack (513) and the rotating rod (516). A clamping plate (518) is fixedly connected to the inside of the coupling (517).

2. The quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 1, characterized in that: The support legs (3) are provided in multiple sets at the bottom of the replacement platform (1) and the new mold placement platform (2), and are respectively distributed at the four corners of the bottom of the replacement platform (1) and the new mold placement platform (2).

3. A quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 1, characterized in that: The slide (502) has two sets on the surface of the crossbeam (501), and one set is rotatably connected to a threaded rod (506), while the other set is fixedly connected to an auxiliary rod (507).

4. A quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 1, characterized in that: The position of the slider (508) corresponds to the position of the groove (502), and the outer wall size of the slider (508) matches the inner wall size of the groove (502).

5. A quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 1, characterized in that: The positioning and engaging mechanism (6) includes a tray (601), a telescopic groove (602), a telescopic spring (603), a locking block (604), a chassis (605), a slot (606), and a clamp (607). The upper surface of the replacement platform (1) is fixedly connected to the tray (601). The bottom of the telescopic groove (602) on the surface of the tray (601) is fixedly connected to the telescopic spring (603). The top of the telescopic spring (603) is fixedly connected to the locking block (604). The upper surface of the tray (601) is engaged with the chassis (605). The bottom of the chassis (605) is provided with a slot (606). The top of the chassis (605) is fixedly connected to the clamp (607).

6. A quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 5, characterized in that: Multiple sets of the telescopic springs (603) are arranged inside the telescopic groove (602), and each set of telescopic springs (603) is distributed at equal intervals.

7. A quick die-changing device for cold rolling of small-diameter seamless steel pipes according to claim 5, characterized in that: The locking block (604) and the telescopic spring (603) cooperate to form a telescopic structure, and the outer wall size of the locking block (604) matches the inner wall size of the locking groove (606).

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