Length-adaptive steel pipe coating equipment

Abstract

The invention discloses length self-adaptive steel pipe coating equipment which comprises a rack and further comprises two sets of X-axis displacement mechanisms symmetrically installed on the two sides of the rack, two sets of Y-axis displacement mechanisms symmetrically installed on the two sides of the rack, and two sets of Y-axis displacement mechanisms symmetrically installed on the two sides of the rack. The Y-axis displacement mechanism is mounted between the two groups of X-axis displacement mechanisms; the two Z-axis displacement mechanisms are symmetrically mounted at the front end and the rear end of one side of each Z-axis displacement mechanism; the coating mechanism is mounted below the Z-axis displacement mechanism; the bearing mechanism is arranged in the ground rail in a sliding manner through a supporting plate; the bearing mechanism comprises a driving headstock, a driven headstock and supporting rollers installed on the driving headstock and the driven headstock respectively. The distance between the supporting rollers can be adjusted to a proper length so as to adapt to steel pipes with different lengths, so that the steel pipes can be stably and uniformly supported in the coating process, and the coating quality problem caused by length mismatching is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of steel pipe coating, and in particular, relates to a length-adaptive steel pipe coating device. Background Art

[0002] The coated steel pipe is a composite pipe with a steel pipe as the base pipe and plastic powder (such as epoxy resin) as the coating material. A plastic layer is coated on the inner surface and a plastic layer or other material anti-corrosion layer is coated on the outer surface. The coated steel pipe is also called plastic-coated steel pipe.

[0003] When negative buoyancy coating is applied to the outer surface of a steel pipe, the steel pipe needs to be placed on a coating vehicle. Since the length error of the steel pipe cannot adapt to the fixed length distance of the steel pipe support wheel when the steel pipe is of fixed length, the steel pipe needs to be graded according to length during general operations, and the fixed length distance of the support wheel needs to be preset according to the grade difference, and the coating operation needs to be completed in batches. Due to this limitation, online length sorting, classification, batch operations, etc. of steel pipes consume a lot of manpower and material resources, which increases the cost of coating operations. Summary of the invention

[0004] The present invention provides a length-adaptive steel pipe coating device, which solves the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is: a length-adaptive steel pipe coating device, including a frame, and also including:

[0006] X-axis displacement mechanism, wherein two groups of X-axis displacement mechanisms are provided and symmetrically installed on both sides of the frame;

[0007] A Y-axis displacement mechanism, wherein the Y-axis displacement mechanism is installed between the two sets of X-axis displacement mechanisms;

[0008] A Z-axis displacement mechanism, wherein the Z-axis displacement mechanism is provided with two groups and is symmetrically installed at the front and rear ends of one side of the Z-axis displacement mechanism;

[0009] A coating mechanism, wherein the coating mechanism is installed below the Z-axis displacement mechanism;

[0010] A bearing mechanism, wherein the bearing mechanism is slidably arranged in the ground rail through a support plate;

[0011] The bearing mechanism comprises a driving locomotive, a passive locomotive, supporting rollers respectively installed on the driving locomotive and the passive locomotive, and a length adjustment component installed between the driving locomotive and the passive locomotive.

[0012] Preferably, the length adjustment assembly includes two groups of large arm levers connected to the driving locomotive head, two groups of small arm levers arranged inside the large arm levers and connected to the passive locomotive head, a servo drive motor group installed on the large arm lever, a coaxial connector connected to the output end of the servo drive motor group, and two groups of drive gears installed on the coaxial connector.

[0013] Preferably, the length adjustment assembly further comprises two sets of locking cylinders respectively mounted on the big arm rods, a connecting rod mechanism connected to the output ends of the locking cylinders, and a locking gear mounted on the connecting rod mechanism;

[0014] The small arm rod is evenly spaced with guide pieces and a rack arranged below the small arm rod.

[0015] Preferably, the X-axis displacement mechanism includes two sets of X-axis fixing plates installed on the frame, a transverse screw installed between the two sets of X-axis fixing plates, an X-axis drive motor connected to the transverse screw, and an X-axis slide rail arranged between the two sets of X-axis fixing plates.

[0016] Preferably, the Y-axis displacement mechanism includes a support frame slidably connected to the X-axis slide rail, a Y-axis slide rail installed on one side of the support frame, two sets of Y-axis fixing plates installed on the support frame, a longitudinal screw installed between the two sets of Y-axis fixing plates, and a Y-axis drive motor connected to the longitudinal screw.

[0017] Preferably, the Z-axis displacement mechanism includes a support seat slidably connected to the Y-axis slide rail, an electric guide rail installed on the support seat, and a lifting plate installed on the electric guide rail.

[0018] Preferably, the coating mechanism includes a driving assembly installed below the lifting plate, a coating assembly installed below the driving assembly, and a feeding assembly adapted to the coating assembly.

[0019] Preferably, the driving assembly includes a lifting cylinder, an adapter plate connected to the lifting rod of the lifting cylinder, and a telescopic rod slidably arranged on the adapter plate, and the top end of the telescopic rod is slidably connected to the frame.

[0020] Preferably, the coating assembly includes a mounting plate fixedly connected to the adapter plate, an extended telescopic cylinder fixedly connected to the mounting plate, an extended rod connected to the output rod of the extended telescopic cylinder, a sleeve shaft sleeved on the extended rod and rotatably connected to the extended rod, and a coating roller sleeved on the sleeve shaft.

[0021] Preferably, the feeding assembly includes a silo arranged above the extended telescopic cylinder, an air bag fixedly mounted on the extended rod through a connecting rod, a U-shaped rod connected to one end of the extended rod, a feeding piece installed between the air bag and the U-shaped rod, and a cam fixedly connected to the sleeve shaft;

[0022] The air bag is connected with the material bin and the feeding piece through an air pipe respectively, and a dripping port is provided below the feeding piece.

[0023] The beneficial effects of adopting the above technical solution are:

[0024] 1. The present invention can receive the length information of the preloaded steel pipe online through the bearing mechanism, and the servo-driven length adjustment mechanism can adjust the spacing between the support rollers to a suitable length, thereby adapting to steel pipes of different lengths, ensuring that the steel pipe can be stably and evenly supported during the coating process, thereby avoiding coating quality problems caused by length mismatch.

[0025] 2. The present invention can coat the inside and outside of the steel pipe through the coating assembly, reducing the equipment for conventional steel pipe coating. At the same time, the inside and outside of the steel pipe can be coated at the same time without changing the site. It not only saves the time and labor cost of changing equipment, but also significantly shortens the production cycle. The coating assembly can coat the steel pipe more evenly.

[0026] 3. The present invention drives the feeding component to complete the feeding work through the coating work, that is, the coating roller is fed while coating, thereby achieving automation and no additional power is required. In this way, the two have precise structures and more perfect coordination, which not only avoids the leakage and waste that may be caused by the traditional feeding method, but also ensures the stability and consistency of the coating quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an assembly diagram provided by the present invention;

[0028] Figure 2 It is an assembly diagram of the present invention providing another viewing angle;

[0029] Figure 3 is a side view provided by the present invention;

[0030] Figure 4 It is a structural schematic diagram of the Y-axis displacement mechanism;

[0031] Figure 5 It is the front view of the X-axis displacement mechanism;

[0032] Figure 6 It is a structural schematic diagram of the Z-axis displacement mechanism;

[0033] Figure 7 is a front view of the coating mechanism;

[0034] Figure 8 It is a schematic diagram of the motion state of the coating mechanism;

[0035] Fig. 9 It is a structural schematic diagram of the bearing mechanism;

[0036] Fig.10 is a schematic diagram of the structure of the length adjustment component;

[0037] Fig.11 is a front view of the length adjustment assembly;

[0038] Fig.12 It is a structural diagram of the small arm;

[0039] in:

[0040] 1. Frame; 2. X-axis displacement mechanism; 21. X-axis fixing plate; 22. Horizontal screw; 23. X-axis drive motor; 24. X-axis slide rail; 3. Y-axis displacement mechanism; 31. Support frame; 32. Y-axis slide rail; 33. Y-axis fixing plate; 34. Longitudinal screw; 35. Y-axis drive motor; 4. Z-axis displacement mechanism; 41. Support seat; 42. Electric guide rail; 43. Lifting plate; 5. Coating mechanism; 51. Drive assembly; 511. Lifting cylinder; 512. Adapter plate; 513. Telescopic rod; 52. Coating assembly; 521. Extended telescopic cylinder; 522, extension rod; 523, sleeve shaft; 524, coating roller; 53, feeding assembly; 531, silo; 532, air bag; 533, U-shaped rod; 534, feeding piece; 6, bearing mechanism; 61, driving locomotive; 62, passive locomotive; 63, supporting roller; 64, length adjustment assembly; 641, large arm rod; 642, small arm rod; 643, servo drive motor group; 644, coaxial connector; 645, driving gear; 646, locking cylinder; 647, connecting rod mechanism; 648, locking gear. DETAILED DESCRIPTION

[0041] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the concept and technical solution of the present invention and facilitating its implementation.

[0042] Specifically, Figures 1 to 12 As shown, a length-adaptive steel pipe coating device includes a frame 1 and also includes:

[0043] X-axis displacement mechanism 2, wherein two groups of X-axis displacement mechanism 2 are provided and symmetrically installed on both sides of the frame 1;

[0044] A Y-axis displacement mechanism 3, wherein the Y-axis displacement mechanism 3 is installed between two sets of X-axis displacement mechanisms 2;

[0045] A Z-axis displacement mechanism 4, wherein the Z-axis displacement mechanism 4 is provided with two groups and symmetrically installed at the front and rear ends of one side of the Z-axis displacement mechanism 4;

[0046] A coating mechanism 5, wherein the coating mechanism 5 is installed below the Z-axis displacement mechanism 4;

[0047] A carrying mechanism 6, wherein the carrying mechanism 6 is slidably arranged in the ground rail through a supporting plate;

[0048] The bearing mechanism 6 includes a driving locomotive 61 , a passive locomotive 62 , support rollers 63 respectively mounted on the driving locomotive 61 and the passive locomotive 62 , and a length adjustment component 64 mounted between the driving locomotive 61 and the passive locomotive 62 .

[0049] In this embodiment, the steel pipe to be coated is first placed on the supporting mechanism 6, and the relative position of the two car heads is adjusted through the length adjustment component 64 to adapt to the lengths of different steel pipes. Then, the position of the coating mechanism 5 is adjusted in turn through the X-axis displacement mechanism 2, the Y-axis displacement mechanism 3 and the Z-axis displacement mechanism 4 to coat the steel pipe below.

[0050] It should be noted that four running wheels are installed at the bottom of the driving locomotive 61 to maintain a fixed track gauge and wheelbase. The passive locomotive is provided with the same running wheel group as the active locomotive. The coating mechanism 5 can coat the outside of the steel pipe and can also extend into the inside of the steel pipe to coat the inner wall of the steel pipe.

[0051] The length adjustment assembly 64 includes two groups of large arm rods 641 connected to the driving locomotive 61, two groups of small arm rods 642 arranged inside the large arm rods 641 and connected to the passive locomotive 62, a servo drive motor group 643 installed on the large arm rod 641, a coaxial connector 644 connected to the output end of the servo drive motor group 643, and two groups of drive gears 645 installed on the coaxial connector 644.

[0052] It should be noted that four running wheels are installed at the bottom of the driving locomotive 61 to maintain a fixed track gauge and wheelbase. The car body is connected to the small arm rod 642 and a guide part is installed to guide the small arm rod 642 to enter the inside of the large arm rod 641 under the engagement of the gear rack. The passive locomotive 42 is provided with the same running wheel group as the active locomotive. The principle of the present invention is that the driving gear drives the relative movement of the large and small arms to realize the relative position adjustment of the two locomotives, thereby adapting to the lengths of different steel pipes.

[0053] In addition, the small arm 642 is a welded structure with a rack at the bottom, a guide element on the arm, one end of which is open and the other end can be connected to the passive locomotive head; two sets of small arm can be used at the same time;

[0054] The boom is a welded hollow structure, with one end provided with a gear-driven servo motor group, a driving gear, a coaxial connector, a locking gear, a connecting rod mechanism, a locking cylinder and other components. The other end of the boom can be connected to the active locomotive head, and the two sets of booms are connected together through a coaxial connector.

[0055] The length adjustment assembly 64 further includes two sets of locking cylinders 646 respectively mounted on the large arm rod 641, a connecting rod mechanism 647 connected to the output end of the locking cylinder 646, and a locking gear 648 mounted on the connecting rod mechanism 647;

[0056] The small arm rod 642 is evenly spaced with guide members and a rack disposed below the small arm rod 642 .

[0057] It should be noted that the servo motor group drives the gear to rotate forward and reverse, and the coaxial mechanism synchronously drives the gears at the two ends of the big arm to drive the racks so that the small arm enters the big arm and can move back and forth, and adjust the relative positions of the big and small arms. The small arm guide element can provide appropriate guidance to keep the meshing of the gear and rack in a good state, and the movement of the small arm drives the passive locomotive to move to the preset locomotive length;

[0058] In detail, the position is locked. When the position of the large and small arms is adjusted into place and the drive motor stops running, that is, the two car heads reach the set supporting steel pipe length, the position locking mechanism starts to move forward, and the locking cylinder pushes the connecting rod mechanism to move. The connecting rod mechanism drives the locking gear to engage with the positive meshing surface of the rack with adjustable pressure of the cylinder. The cylinder has a mechanical limit in the locked position; the distance between the locking gear and the driving gear in the translational direction of the arm is an integer pitch of 0.95 times the rack pitch, so the locking gear does not affect the normal meshing of the gear rack in the non-locked position, that is, the large and small arms can be adjusted normally, and are interlocked with the stop of the servo motor in the locked position to ensure that the coating vehicle can stably maintain the relative position of the two car heads during reciprocating motion.

[0059] In addition, in the production process, the front-end process of the coating process is the weighing and length measuring process. The weighing and length measurement results are automatically entered into the system with the pipe number as the index. When the steel pipe enters the coating process, the online scanning system retrieves the pipe number, and the pipe length parameters immediately enter the coating process control system. The length of the coating vehicle is adjusted to an appropriate position when waiting for loading.

[0060] The X-axis displacement mechanism 2 includes two sets of X-axis fixing plates 21 installed on the frame 1, a transverse screw rod 22 installed between the two sets of X-axis fixing plates 21, an X-axis driving motor 23 connected to the transverse screw rod 22, and an X-axis slide rail 24 arranged between the two sets of X-axis fixing plates 21.

[0061] It should be noted that, by starting the X-axis driving motor 23 , the transverse screw 22 is driven to rotate, thereby driving the support frame 31 to move on the X-axis slide rail 24 .

[0062] The Y-axis displacement mechanism 3 includes a support frame 31 slidably connected to the X-axis slide rail 24, a Y-axis slide rail 32 installed on one side of the support frame 31, two sets of Y-axis fixing plates 33 installed on the support frame 31, a longitudinal screw 34 installed between the two sets of Y-axis fixing plates 33, and a Y-axis drive motor 35 connected to the longitudinal screw 34.

[0063] It should be noted that by starting the Y-axis driving motor 35 , the longitudinal screw 34 is driven to rotate, thereby driving the support seat 41 to move on the Y-axis slide rail 32 .

[0064] The Z-axis displacement mechanism 4 includes a support base 41 slidably connected to the Y-axis slide rail 32 , an electric guide rail 42 installed on the support base 41 , and a lifting plate 43 installed on the electric guide rail 42 .

[0065] It should be noted that starting the electric guide rail 42 can drive the lifting plate 43 to move up and down. Its function is to retract the coating mechanism 5 upward when it is not working to prevent it from hindering the movement of the steel pipe, and lower it when it needs to work.

[0066] The coating mechanism 5 includes a driving assembly 51 installed below the lifting plate 43 , a coating assembly 52 installed below the driving assembly 51 , and a feeding assembly 53 matched with the coating assembly 52 .

[0067] The driving assembly 51 includes a lifting cylinder 511 , an adapter plate 512 connected to the lifting rod of the lifting cylinder 511 , and a telescopic rod 513 slidably disposed on the adapter plate 512 , and the top end of the telescopic rod 513 is slidably connected to the frame 1 .

[0068] It should be noted that when the Z-axis displacement mechanism 4 does not descend enough, it is necessary to start the lifting cylinder 511 to drive the adapter plate 512 to continue to descend to supplement the Z-axis displacement mechanism 4. At the same time, the telescopic rod 513 strengthens the adapter plate 512 to prevent it from being unable to withstand its heavy capacity, and it is set as a sliding connection to avoid hindering the adjustment of its position.

[0069] The coating assembly 52 includes a mounting plate fixedly connected to the adapter plate 512, an extended telescopic cylinder 521 fixedly connected to the mounting plate, an extended rod 522 connected to the output rod of the extended telescopic cylinder 521, a sleeve shaft 523 sleeved on the extended rod 522 and rotatably connected to the extended rod 522, and a coating roller 524 sleeved on the sleeve shaft 523.

[0070] It should be noted that when coating the outside of the steel pipe, the coating assembly 52 is moved to the top of one end of the steel pipe through the cooperation of multiple sets of displacement mechanisms, and then the steel pipe is rotated by the support roller 63, so that the steel pipe can be evenly coated, and then the extended telescopic cylinder 521 can be started to move inward at a uniform speed, that is, the steel pipe is evenly coated. In this scheme, the coating roller 524 is coated in contact with the steel pipe, so even if some parts of the steel pipe are coated multiple times, they will be carried away by subsequent rolling, that is, as long as the steel pipe is in contact with the coating roller 524, its coating thickness will be consistent and uniform.

[0071] When coating the inner side of the steel pipe, the coating assembly 52 is sent to one end of the inner side of the steel pipe through the cooperation of multiple displacement mechanisms, and then the steel pipe is rotated by the support roller 63, so that the inner wall of the steel pipe can be coated evenly, and then the extended telescopic cylinder 521 can be started to move inward at a uniform speed, that is, the inner wall of the steel pipe can be coated evenly;

[0072] In addition, since the coating mechanism 5 is symmetrically arranged in two groups, it can be ensured that there is enough distance to coat the inside of the steel pipe, and the coating assembly 52 can coat the inside and outside of the steel pipe, reducing the equipment for conventional steel pipe coating, and can coat the inside and outside of the steel pipe at the same time without changing the site, which not only saves the time and labor cost of replacing equipment, but also significantly shortens the production cycle.

[0073] The feeding assembly 53 includes a material bin 531 disposed above the extended telescopic cylinder 521, an air bag 532 fixedly mounted on the extended rod 522 through a connecting rod, a U-shaped rod 533 connected to one end of the extended rod 522, a feeding piece 534 installed between the air bag 532 and the U-shaped rod 533, and a cam 535 fixedly connected to the sleeve shaft 523;

[0074] The air bag 532 is connected to the material bin 531 and the feeding piece 534 through an air pipe, and a drip port is opened below the feeding piece 534.

[0075] It should be noted that, no matter whether the outer side or the inner side of the steel pipe is coated, when the coating roller 524 rotates, the sleeve shaft 523 on the inner side thereof will be driven to rotate, and the cam 535 on one side thereof will also rotate accordingly, thereby intermittently squeezing the airbag 532, and a one-way valve is installed on the air pipe connecting the airbag 532 and the silo 531, that is, the airbag 532 will extract the paint in the silo 531 and send it into the feeding piece 534, and the feeding piece 534 is arranged directly above the coating roller 524, so as to feed the coating roller 524 through the drip port, that is, the feeding work is completed by coating, which is automated and does not require additional power. In this way, the two have precise structures and more perfect coordination, which not only avoids leakage and waste that may occur in traditional feeding methods, but also ensures the stability and consistency of coating quality.

[0076] The specific working method is described below with specific embodiments:

[0077] Embodiment 1:

[0078] First, the steel pipe to be coated is placed on the bearing mechanism 6, and the relative position of the two car heads is adjusted by the length adjustment component 64 to adapt to the length of different steel pipes, and then the position of the coating mechanism 5 is adjusted by the X-axis displacement mechanism 2, the Y-axis displacement mechanism 3 and the Z-axis displacement mechanism 4 in turn. When coating the outer side of the steel pipe, the coating component 52 is moved to the top of one end of the steel pipe through the cooperation of multiple groups of displacement mechanisms, and then the steel pipe is rotated by the supporting roller 63, so that the steel pipe can be coated evenly, and then the extended telescopic cylinder 521 can be started to move inward at a uniform speed, that is, the steel pipe is evenly coated. In this scheme, the coating roller 524 is coated in contact with the steel pipe, so even if part of the steel pipe position is coated multiple times, it will be taken away by the subsequent rolling, that is, as long as the steel pipe is in contact with the coating roller 524, its coating thickness will be consistent and uniform;

[0079] When coating the inner side of the steel pipe, it is necessary to send the coating assembly 52 into one end of the inner side of the steel pipe through the cooperation of multiple sets of displacement mechanisms again, and then rotate the steel pipe through the support roller 63 to evenly coat the inner wall of the steel pipe. Then, by starting the extended telescopic cylinder 521, it can move inward at a uniform speed, that is, evenly coat the inner wall of the steel pipe.

[0080] Embodiment 2:

[0081] No matter coating the outside or inside of the steel pipe, when the coating roller 524 rotates, the sleeve shaft 523 on the inside thereof will be driven to rotate, and the cam 535 on one side thereof will also rotate accordingly, thereby intermittently squeezing the airbag 532, and a one-way valve is installed on the air pipe connecting the airbag 532 and the silo 531, that is, the airbag 532 will extract the paint in the silo 531 and send it into the feeding piece 534, and the feeding piece 534 is arranged directly above the coating roller 524, so as to feed the coating roller 524 through the drip port, that is, the feeding work is completed by coating, which is automated and does not require additional power. In this way, the two have precise structures and more perfect coordination, which not only avoids leakage and waste that may occur in traditional feeding methods, but also ensures the stability and consistency of coating quality.

[0082] Embodiment 3:

[0083] Four running wheels are installed at the bottom of the driving locomotive 61 to maintain a fixed track gauge and wheelbase. The body is connected to the small arm rod 642 and a guide part is installed to guide the small arm rod 642 to enter the inside of the large arm rod 641 under the meshing of the gear rack. The passive locomotive 42 is provided with the same running wheel group as the active locomotive. The principle of the present invention is that the driving gear drives the large and small arm rods to move relative to each other to achieve the relative position adjustment of the two locomotives, thereby adapting to the lengths of different steel pipes.

[0084] The servo motor group drives the gear to rotate forward and reverse, and the coaxial mechanism synchronously drives the gears at the two ends of the big arm to drive the racks so that the small arm enters the big arm and can move back and forth, and adjust the relative position of the big and small arms. The small arm guide element can provide appropriate guidance to keep the meshing of the gear and rack in a good state. The movement of the small arm drives the passive locomotive to move to the preset locomotive length;

[0085] Position locking, when the position of the large and small arms is adjusted into place, the drive motor stops running, that is, the two car heads reach the set supporting steel pipe length, the position locking mechanism starts to move forward, the locking cylinder pushes the connecting rod mechanism to move, and the connecting rod mechanism drives the locking gear to engage with the positive meshing surface of the rack, with adjustable pressure of the cylinder, and the cylinder is provided with a mechanical limit in the locking position; the distance between the locking gear and the driving gear in the translation direction of the arm is an integer pitch of 0.95 times the rack pitch, so the locking gear does not affect the normal meshing of the gear rack in the non-locking position, that is, the large and small arms can be adjusted normally, and form an interlock with the stop of the servo motor in the locking position to ensure that the coating vehicle can stably maintain the relative position of the two car heads during reciprocating motion.

[0086] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above-mentioned concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A length-adaptive steel pipe coating device, comprising a frame (1), characterized in that: Also includes: An X-axis displacement mechanism (2), wherein two groups of the X-axis displacement mechanisms (2) are provided and are symmetrically mounted on both sides of the frame (1); A Y-axis displacement mechanism (3), wherein the Y-axis displacement mechanism (3) is installed between the two sets of X-axis displacement mechanisms (2); A Z-axis displacement mechanism (4), wherein the Z-axis displacement mechanism (4) is provided with two groups and is symmetrically mounted at the front and rear ends of one side of the Z-axis displacement mechanism (4); A coating mechanism (5), wherein the coating mechanism (5) is installed below the Z-axis displacement mechanism (4); A bearing mechanism (6), wherein the bearing mechanism (6) is slidably arranged in the ground rail via a support plate; The bearing mechanism (6) comprises a driving locomotive (61), a passive locomotive (62), supporting rollers (63) respectively mounted on the driving locomotive (61) and the passive locomotive (62), and a length adjustment component (64) mounted between the driving locomotive (61) and the passive locomotive (62).

2. The length-adaptive steel pipe coating device according to claim 1, characterized in that: The length adjustment assembly (64) comprises two groups of large arm rods (641) connected to the driving locomotive (61), two groups of small arm rods (642) arranged inside the large arm rods (641) and connected to the passive locomotive (62), a servo drive motor group (643) installed on the large arm rod (641), a coaxial connecting piece (644) connected to the output end of the servo drive motor group (643), and two groups of drive gears (645) installed on the coaxial connecting piece (644).

3. The length-adaptive steel pipe coating equipment according to claim 2, characterized in that: The length adjustment assembly (64) further comprises two sets of locking cylinders (646) respectively mounted on the large arm rod (641), a connecting rod mechanism (647) connected to the output end of the locking cylinder (646), and a locking gear (648) mounted on the connecting rod mechanism (647); The small arm rod (642) is evenly spaced with guide members and a rack arranged below the small arm rod (642).

4. The length-adaptive steel pipe coating device according to claim 1, characterized in that: The X-axis displacement mechanism (2) comprises two sets of X-axis fixing plates (21) mounted on the frame (1), a transverse screw rod (22) mounted between the two sets of X-axis fixing plates (21), an X-axis driving motor (23) connected to the transverse screw rod (22), and an X-axis slide rail (24) arranged between the two sets of X-axis fixing plates (21).

5. The length-adaptive steel pipe coating device according to claim 4, characterized in that: The Y-axis displacement mechanism (3) comprises a support frame (31) slidably connected to the X-axis slide rail (24), a Y-axis slide rail (32) mounted on one side of the support frame (31), two groups of Y-axis fixing plates (33) mounted on the support frame (31), a longitudinal screw rod (34) mounted between the two groups of Y-axis fixing plates (33), and a Y-axis driving motor (35) connected to the longitudinal screw rod (34).

6. The length-adaptive steel pipe coating equipment according to claim 5, characterized in that: The Z-axis displacement mechanism (4) comprises a support seat (41) slidably connected to the Y-axis slide rail (32), an electric guide rail (42) mounted on the support seat (41), and a lifting plate (43) mounted on the electric guide rail (42).

7. The length-adaptive steel pipe coating device according to claim 6, characterized in that: The coating mechanism (5) comprises a driving component (51) installed below the lifting plate (43), a coating component (52) installed below the driving component (51), and a feeding component (53) adapted to the coating component (52).

8. The length-adaptive steel pipe coating equipment according to claim 7, characterized in that: The driving assembly (51) comprises a lifting cylinder (511), an adapter plate (512) connected to a lifting rod of the lifting cylinder (511), and a telescopic rod (513) slidably arranged on the adapter plate (512), wherein the top end of the telescopic rod (513) is slidably connected to the frame (1).

9. The length-adaptive steel pipe coating device according to claim 8, characterized in that: The coating assembly (52) comprises a mounting plate fixedly connected to the adapter plate (512), an extended telescopic cylinder (521) fixedly connected to the mounting plate, an extended rod (522) connected to the output rod of the extended telescopic cylinder (521), a sleeve shaft (523) sleeved on the extended rod (522) and rotatably connected to the extended rod (522), and a coating roller (524) sleeved on the sleeve shaft (523).

10. The length-adaptive steel pipe coating equipment according to claim 9, characterized in that: The feeding assembly (53) comprises a material bin (531) arranged above the extended telescopic cylinder (521), an air bag (532) fixedly mounted on the extended rod (522) via a connecting rod, a U-shaped rod (533) connected to one end of the extended rod (522), a feeding piece (534) mounted between the air bag (532) and the U-shaped rod (533), and a cam (535) fixedly connected to the sleeve shaft (523); The air bag (532) is connected to the material bin (531) and the feeding piece (534) through an air pipe, and a drip port is provided below the feeding piece (534).

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